/* roulang page: index */
:root {
            --bg-deep: #08090F;
            --bg-navy: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.82);
            --bg-glass: rgba(15, 20, 36, 0.65);
            --primary: #0052FF;
            --primary-bright: #0066FF;
            --accent: #00F0FF;
            --accent-dim: rgba(0, 240, 255, 0.35);
            --accent-glow: rgba(0, 240, 255, 0.55);
            --gold: #FFD700;
            --gold-soft: rgba(255, 215, 0, 0.22);
            --danger: #FF3B6B;
            --danger-glow: rgba(255, 59, 107, 0.45);
            --success: #2BFF88;
            --success-glow: rgba(43, 255, 136, 0.4);
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #7C8AA5;
            --text-cyan: #7EE8FF;
            --border-card: rgba(0, 240, 255, 0.18);
            --border-electric: rgba(0, 82, 255, 0.5);
            --border-glass: rgba(255, 255, 255, 0.08);
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45);
            --shadow-neon: 0 0 24px rgba(0, 240, 255, 0.18);
            --shadow-electric: 0 0 30px rgba(0, 82, 255, 0.3);
            --font-sans: 'Be Vietnam Pro', 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-mid: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-sans);
            background-color: var(--bg-deep);
            background-image:
                radial-gradient(ellipse at 15% -10%, rgba(0, 82, 255, 0.18) 0%, transparent 58%),
                radial-gradient(ellipse at 85% 10%, rgba(0, 240, 255, 0.1) 0%, transparent 45%),
                linear-gradient(180deg, #08090F 0%, #0D111E 42%, #08090F 100%);
            color: var(--text-silver);
            line-height: 1.6;
            font-size: 16px;
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:hover,
        a:focus-visible {
            color: var(--text-cyan);
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: 4px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text-white);
            font-weight: 700;
            line-height: 1.25;
            margin-top: 0;
        }

        h1 {
            font-size: clamp(2rem, 4.5vw, 3rem);
            letter-spacing: -0.02em;
        }

        h2 {
            font-size: clamp(1.5rem, 2.8vw, 2.15rem);
            letter-spacing: -0.01em;
            margin-bottom: 0.75rem;
        }

        h3 {
            font-size: clamp(1.15rem, 1.8vw, 1.45rem);
            letter-spacing: -0.005em;
        }

        p {
            margin-top: 0;
            margin-bottom: 1rem;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 16px;
            padding-right: 16px;
        }

        .container-wide {
            width: 100%;
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 16px;
            padding-right: 16px;
        }

        .section {
            padding-top: 64px;
            padding-bottom: 64px;
            position: relative;
        }

        .section-alt {
            background: var(--bg-navy);
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }

        .section-glow {
            background:
                radial-gradient(ellipse at 50% 0%, rgba(0, 82, 255, 0.08) 0%, transparent 60%),
                transparent;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--accent);
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid var(--accent-dim);
            border-radius: 50px;
            padding: 6px 14px;
            margin-bottom: 1rem;
        }

        .section-label i {
            font-size: 0.7rem;
        }

        .section-title-group {
            margin-bottom: 2.5rem;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 720px;
            line-height: 1.65;
        }

        /* ============ HEADER / NAV ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-glass);
            transition: background var(--transition-mid), box-shadow var(--transition-mid);
        }

        .site-header.scrolled {
            background: rgba(8, 9, 15, 0.98);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
        }

        .site-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
            flex-wrap: nowrap;
        }

        .nav-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
            min-width: 0;
        }

        .nav-brand-icon {
            width: 40px;
            height: 40px;
            flex-shrink: 0;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            box-shadow: var(--shadow-electric);
            position: relative;
            overflow: hidden;
        }

        .nav-brand-icon::after {
            content: '';
            position: absolute;
            top: -30%;
            right: -30%;
            width: 55%;
            height: 160%;
            background: rgba(255, 255, 255, 0.28);
            transform: rotate(35deg);
            pointer-events: none;
        }

        .nav-brand-text {
            font-weight: 800;
            font-size: 0.98rem;
            color: var(--text-white);
            line-height: 1.25;
            letter-spacing: -0.01em;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 220px;
        }

        .nav-brand-text span {
            color: var(--accent);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-shrink: 1;
            min-width: 0;
        }

        .nav-menu li {
            margin: 0;
        }

        .nav-menu .nav-link {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 14px;
            border-radius: 8px;
            color: var(--text-silver);
            font-weight: 500;
            font-size: 0.88rem;
            white-space: nowrap;
            transition: color var(--transition-fast), background var(--transition-fast);
            position: relative;
        }

        .nav-menu .nav-link i {
            font-size: 0.75rem;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }

        .nav-menu .nav-link:hover,
        .nav-menu .nav-link:focus-visible {
            color: var(--text-white);
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-menu .nav-link:hover i,
        .nav-menu .nav-link:focus-visible i {
            color: var(--accent);
        }

        .nav-menu .nav-link.active {
            color: var(--text-white);
            background: rgba(0, 240, 255, 0.1);
        }

        .nav-menu .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
            box-shadow: 0 0 8px var(--accent-glow);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }

        .btn-login {
            padding: 8px 14px;
            border-radius: 8px;
            color: var(--text-silver);
            font-weight: 600;
            font-size: 0.85rem;
            background: transparent;
            border: 1px solid var(--border-glass);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .btn-login:hover {
            color: var(--text-white);
            border-color: var(--accent-dim);
            background: rgba(0, 240, 255, 0.08);
        }

        .btn-signup {
            padding: 8px 18px;
            border-radius: 8px;
            color: #fff;
            font-weight: 700;
            font-size: 0.85rem;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-bright) 55%, var(--accent) 130%);
            border: none;
            box-shadow: 0 4px 18px rgba(0, 82, 255, 0.4);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
            overflow: hidden;
        }

        .btn-signup::after {
            content: '';
            position: absolute;
            top: -30%;
            right: -25%;
            width: 45%;
            height: 160%;
            background: rgba(255, 255, 255, 0.25);
            transform: rotate(30deg);
            pointer-events: none;
            transition: right var(--transition-mid);
        }

        .btn-signup:hover {
            box-shadow: 0 6px 28px rgba(0, 240, 255, 0.45);
            transform: translateY(-1px);
            color: #fff;
        }

        .btn-signup:hover::after {
            right: 120%;
        }

        .btn-signup:active {
            transform: translateY(1px);
            box-shadow: 0 2px 10px rgba(0, 82, 255, 0.35);
        }

        .nav-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border-radius: 10px;
            border: 1px solid var(--border-glass);
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-white);
            font-size: 1.15rem;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-fast);
            flex-shrink: 0;
        }

        .nav-toggle:hover {
            background: rgba(0, 240, 255, 0.12);
            border-color: var(--accent-dim);
        }

        @media (max-width: 991.98px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 68px;
                left: 0;
                right: 0;
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                background: rgba(8, 9, 15, 0.98);
                border-bottom: 1px solid var(--border-glass);
                padding: 12px 16px 16px;
                box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
            }

            .nav-menu.open {
                display: flex;
            }

            .nav-menu .nav-link {
                padding: 12px 14px;
                border-radius: 10px;
                font-size: 0.95rem;
            }

            .nav-toggle {
                display: flex;
            }

            .nav-brand-text {
                max-width: 160px;
                font-size: 0.88rem;
            }
        }

        @media (max-width: 575.98px) {
            .site-nav {
                min-height: 62px;
            }
            .nav-brand-text {
                max-width: 120px;
                font-size: 0.8rem;
            }
            .btn-login {
                padding: 7px 11px;
                font-size: 0.8rem;
            }
            .btn-signup {
                padding: 7px 13px;
                font-size: 0.8rem;
            }
            .nav-brand-icon {
                width: 34px;
                height: 34px;
                border-radius: 10px;
                font-size: 0.95rem;
            }
        }

        /* ============ HERO ============ */
        .hero-section {
            padding-top: 40px;
            padding-bottom: 56px;
            position: relative;
            overflow: hidden;
            min-height: 580px;
            display: flex;
            align-items: center;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center 38%;
            z-index: 0;
            opacity: 0.32;
            filter: saturate(0.8) contrast(1.05);
        }

        .hero-bg-overlay {
            position: absolute;
            inset: 0;
            background:
                linear-gradient(180deg, rgba(8, 9, 15, 0.62) 0%, rgba(8, 9, 15, 0.78) 55%, #08090F 100%),
                radial-gradient(ellipse at 30% 30%, rgba(0, 82, 255, 0.22) 0%, transparent 55%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            width: 100%;
        }

        .hero-coupon-wall {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 32px;
            align-items: center;
        }

        .hero-left {
            text-align: left;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 7px 16px;
            border-radius: 50px;
            background: rgba(0, 240, 255, 0.09);
            border: 1px solid var(--accent-dim);
            color: var(--accent);
            font-size: 0.78rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            margin-bottom: 1.15rem;
        }

        .hero-badge i {
            font-size: 0.7rem;
            animation: pulse-dot 1.8s ease-in-out infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.35; }
        }

        .hero-title {
            font-size: clamp(1.9rem, 4.2vw, 2.9rem);
            margin-bottom: 1rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: -0.02em;
            line-height: 1.18;
        }

        .hero-title .highlight {
            color: var(--accent);
            text-shadow: 0 0 28px rgba(0, 240, 255, 0.35);
        }

        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-silver);
            max-width: 560px;
            line-height: 1.65;
            margin-bottom: 1.5rem;
        }

        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 1.25rem;
        }

        .btn-primary-glow {
            padding: 12px 26px;
            border-radius: 12px;
            font-weight: 700;
            font-size: 0.95rem;
            color: #fff;
            background: linear-gradient(135deg, var(--primary) 0%, #0066FF 45%, var(--accent) 130%);
            border: none;
            box-shadow: 0 6px 26px rgba(0, 82, 255, 0.45);
            transition: all var(--transition-fast);
            position: relative;
            overflow: hidden;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-primary-glow::after {
            content: '';
            position: absolute;
            top: -25%;
            right: -20%;
            width: 40%;
            height: 150%;
            background: rgba(255, 255, 255, 0.3);
            transform: rotate(28deg);
            transition: right var(--transition-mid);
        }

        .btn-primary-glow:hover {
            box-shadow: 0 8px 36px rgba(0, 240, 255, 0.55);
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-primary-glow:hover::after {
            right: 120%;
        }

        .btn-primary-glow:active {
            transform: translateY(1px);
            box-shadow: 0 3px 12px rgba(0, 82, 255, 0.4);
        }

        .btn-outline-glow {
            padding: 12px 26px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-white);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-card);
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }

        .btn-outline-glow:hover {
            color: var(--accent);
            border-color: var(--accent);
            background: rgba(0, 240, 255, 0.08);
            box-shadow: 0 0 24px rgba(0, 240, 255, 0.15);
            transform: translateY(-1px);
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .hero-stats li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.88rem;
            color: var(--text-muted);
        }

        .hero-stats .stat-num {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-white);
            letter-spacing: -0.01em;
        }

        .hero-stats .stat-num.accent {
            color: var(--accent);
        }

        .hero-coupon-panel {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .coupon-main {
            background: var(--bg-glass);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 26px 24px;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-card), var(--shadow-neon);
        }

        .coupon-main::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
        }

        .coupon-main .coupon-label {
            font-size: 0.72rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--accent);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .coupon-main .coupon-code {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 0.06em;
            margin-bottom: 10px;
            text-shadow: 0 0 18px rgba(0, 240, 255, 0.25);
        }

        .coupon-main .coupon-desc {
            font-size: 0.92rem;
            color: var(--text-muted);
            margin-bottom: 16px;
            line-height: 1.5;
        }

        .coupon-main .btn-coupon {
            width: 100%;
            padding: 12px;
            border-radius: 10px;
            border: none;
            font-weight: 700;
            font-size: 0.92rem;
            color: #08090F;
            background: linear-gradient(135deg, var(--gold) 0%, #FFC107 60%, #FFE082 100%);
            box-shadow: 0 4px 22px rgba(255, 215, 0, 0.35);
            transition: all var(--transition-fast);
        }

        .coupon-main .btn-coupon:hover {
            box-shadow: 0 7px 30px rgba(255, 215, 0, 0.55);
            transform: translateY(-2px);
        }

        .coupon-main .btn-coupon:active {
            transform: translateY(1px);
        }

        .coupon-small-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

        .coupon-small {
            background: rgba(13, 17, 30, 0.72);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 16px;
            transition: all var(--transition-fast);
            cursor: default;
        }

        .coupon-small:hover {
            border-color: var(--accent-dim);
            box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
            transform: translateY(-2px);
        }

        .coupon-small .cs-title {
            font-weight: 700;
            color: var(--text-white);
            font-size: 0.9rem;
            margin-bottom: 4px;
        }

        .coupon-small .cs-code {
            font-size: 0.78rem;
            color: var(--accent);
            font-weight: 600;
            letter-spacing: 0.04em;
        }

        .coupon-small .cs-desc {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 6px;
            line-height: 1.4;
        }

        @media (max-width: 991.98px) {
            .hero-coupon-wall {
                grid-template-columns: 1fr;
                gap: 26px;
            }
            .hero-section {
                min-height: auto;
                padding-top: 32px;
                padding-bottom: 44px;
            }
            .hero-left {
                text-align: left;
            }
            .hero-desc {
                max-width: 100%;
            }
        }

        @media (max-width: 575.98px) {
            .coupon-small-grid {
                grid-template-columns: 1fr;
            }
            .hero-stats {
                gap: 12px;
            }
            .hero-stats li {
                font-size: 0.8rem;
            }
            .hero-stats .stat-num {
                font-size: 1.05rem;
            }
            .coupon-main .coupon-code {
                font-size: 1.3rem;
            }
        }

        /* ============ GENERIC COMPONENTS ============ */
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 22px;
            transition: all var(--transition-fast);
            position: relative;
            overflow: hidden;
        }

        .glass-card:hover {
            border-color: var(--border-card);
            box-shadow: var(--shadow-card), var(--shadow-neon);
            transform: translateY(-3px);
        }

        .glass-card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.25), rgba(0, 240, 255, 0.15));
            border: 1px solid var(--border-electric);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--accent);
            margin-bottom: 14px;
        }

        .glass-card h3 {
            font-size: 1.05rem;
            margin-bottom: 8px;
        }

        .glass-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.55;
        }

        .img-cover {
            width: 100%;
            border-radius: var(--radius-sm);
            object-fit: cover;
            border: 1px solid var(--border-glass);
        }

        .img-cover-hover {
            transition: transform var(--transition-mid), border-color var(--transition-mid), box-shadow var(--transition-mid);
        }

        .img-cover-hover:hover {
            transform: scale(1.03);
            border-color: var(--accent-dim);
            box-shadow: 0 6px 24px rgba(0, 240, 255, 0.12);
        }

        /* ============ CHANNEL SELLING POINTS ============ */
        .channel-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .channel-card {
            background: var(--bg-card);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all var(--transition-fast);
            position: relative;
        }

        .channel-card::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 16px;
            right: 16px;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 2px;
            opacity: 0;
            transition: opacity var(--transition-fast);
        }

        .channel-card:hover::after {
            opacity: 1;
        }

        .channel-card:hover {
            border-color: var(--border-electric);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
            transform: translateY(-4px);
        }

        .channel-card .cc-head {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 12px;
        }

        .channel-card .cc-icon {
            width: 44px;
            height: 44px;
            flex-shrink: 0;
            border-radius: 10px;
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid var(--accent-dim);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 1.15rem;
        }

        .channel-card h3 {
            font-size: 1.1rem;
            margin: 0;
        }

        .channel-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.55;
        }

        @media (max-width: 991.98px) {
            .channel-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 575.98px) {
            .channel-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ============ SUCCESS DATA STRIP ============ */
        .data-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            padding: 28px 0;
        }

        .data-item {
            text-align: left;
            padding: 18px 20px;
            background: rgba(13, 17, 30, 0.72);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
        }

        .data-item:hover {
            border-color: var(--accent-dim);
            box-shadow: 0 6px 22px rgba(0, 0, 0, 0.4);
            transform: translateY(-2px);
        }

        .data-item .data-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent);
            letter-spacing: -0.02em;
            margin-bottom: 4px;
            text-shadow: 0 0 20px rgba(0, 240, 255, 0.22);
        }

        .data-item .data-label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        @media (max-width: 991.98px) {
            .data-strip {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 575.98px) {
            .data-strip {
                grid-template-columns: 1fr;
                padding: 18px 0;
            }
            .data-item .data-num {
                font-size: 1.4rem;
            }
        }

        /* ============ LEAD FORM ============ */
        .lead-form-section {
            background:
                radial-gradient(ellipse at 15% 20%, rgba(0, 82, 255, 0.12) 0%, transparent 50%),
                radial-gradient(ellipse at 85% 80%, rgba(0, 240, 255, 0.06) 0%, transparent 45%),
                var(--bg-navy);
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }

        .lead-form-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .lead-form-info h2 {
            margin-bottom: 0.75rem;
        }

        .lead-form-info .lead-desc {
            color: var(--text-muted);
            margin-bottom: 1.5rem;
            font-size: 1rem;
            line-height: 1.6;
        }

        .lead-form-info ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .lead-form-info ul li {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-silver);
            font-size: 0.92rem;
        }

        .lead-form-info ul li i {
            color: var(--success);
            font-size: 0.9rem;
        }

        .lead-form-card {
            background: var(--bg-glass);
            backdrop-filter: blur(22px);
            -webkit-backdrop-filter: blur(22px);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-card), var(--shadow-neon);
        }

        .lead-form-card .form-label {
            color: var(--text-silver);
            font-weight: 600;
            font-size: 0.85rem;
        }

        .lead-form-card .form-control {
            background: rgba(8, 9, 15, 0.75);
            border: 1px solid var(--border-glass);
            border-radius: 10px;
            color: var(--text-white);
            padding: 11px 14px;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
        }

        .lead-form-card .form-control:focus {
            background: rgba(8, 9, 15, 0.9);
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.12);
            color: var(--text-white);
        }

        .lead-form-card .form-control::placeholder {
            color: var(--text-muted);
            opacity: 0.7;
        }

        .lead-form-card .btn-submit {
            width: 100%;
            padding: 12px;
            border-radius: 10px;
            border: none;
            font-weight: 700;
            font-size: 0.95rem;
            color: #fff;
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 140%);
            box-shadow: 0 5px 24px rgba(0, 82, 255, 0.4);
            transition: all var(--transition-fast);
        }

        .lead-form-card .btn-submit:hover {
            box-shadow: 0 8px 34px rgba(0, 240, 255, 0.5);
            transform: translateY(-2px);
        }

        .lead-form-card .btn-submit:active {
            transform: translateY(1px);
        }

        @media (max-width: 991.98px) {
            .lead-form-wrapper {
                grid-template-columns: 1fr;
                gap: 26px;
            }
        }

        /* ============ NEWS LIST ============ */
        .news-layout {
            display: grid;
            grid-template-columns: 1.3fr 0.7fr;
            gap: 28px;
            align-items: start;
        }

        .news-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .news-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            padding: 16px 0;
            border-bottom: 1px solid var(--border-glass);
            transition: all var(--transition-fast);
            cursor: pointer;
            text-decoration: none;
        }

        .news-item:hover {
            padding-left: 8px;
        }

        .news-item:last-child {
            border-bottom: none;
        }

        .news-item .news-num {
            flex-shrink: 0;
            width: 34px;
            height: 34px;
            border-radius: 50%;
            background: rgba(0, 240, 255, 0.07);
            border: 1px solid var(--accent-dim);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--accent);
        }

        .news-item .news-body {
            flex: 1;
            min-width: 0;
        }

        .news-item .news-title {
            font-weight: 600;
            font-size: 0.98rem;
            color: var(--text-white);
            margin-bottom: 5px;
            transition: color var(--transition-fast);
            line-height: 1.4;
        }

        .news-item:hover .news-title {
            color: var(--accent);
        }

        .news-item .news-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .news-item .news-meta span {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .news-item .news-meta i {
            font-size: 0.7rem;
            color: var(--accent-dim);
        }

        .news-empty {
            padding: 30px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.95rem;
            background: rgba(13, 17, 30, 0.5);
            border: 1px dashed var(--border-glass);
            border-radius: var(--radius-md);
        }

        .news-sidebar {
            display: flex;
            flex-direction: column;
            gap: 18px;
        }

        .news-sidebar .sidebar-card {
            background: var(--bg-glass);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 20px;
            transition: all var(--transition-fast);
        }

        .news-sidebar .sidebar-card:hover {
            border-color: var(--accent-dim);
            box-shadow: var(--shadow-neon);
        }

        .news-sidebar .sidebar-card h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .news-sidebar .sidebar-card h4 i {
            color: var(--accent);
            font-size: 0.85rem;
        }

        .news-sidebar .sidebar-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .news-sidebar .sidebar-card ul li {
            padding: 7px 0;
            border-bottom: 1px solid var(--border-glass);
            font-size: 0.87rem;
            color: var(--text-muted);
        }

        .news-sidebar .sidebar-card ul li:last-child {
            border-bottom: none;
        }

        .news-sidebar .sidebar-card ul li a {
            color: var(--text-silver);
            transition: color var(--transition-fast);
        }

        .news-sidebar .sidebar-card ul li a:hover {
            color: var(--accent);
        }

        @media (max-width: 991.98px) {
            .news-layout {
                grid-template-columns: 1fr;
            }
            .news-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 575.98px) {
            .news-sidebar {
                grid-template-columns: 1fr;
            }
            .news-item {
                gap: 12px;
                padding: 13px 0;
            }
            .news-item .news-num {
                width: 28px;
                height: 28px;
                font-size: 0.7rem;
            }
            .news-item .news-title {
                font-size: 0.9rem;
            }
        }

        /* ============ PRIVACY / TRUST ============ */
        .privacy-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin-bottom: 20px;
        }

        .privacy-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 16px;
            background: rgba(13, 17, 30, 0.6);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
        }

        .privacy-item:hover {
            border-color: var(--success-glow);
            box-shadow: 0 4px 16px rgba(43, 255, 136, 0.08);
        }

        .privacy-item .pi-icon {
            width: 38px;
            height: 38px;
            flex-shrink: 0;
            border-radius: 9px;
            background: rgba(43, 255, 136, 0.08);
            border: 1px solid rgba(43, 255, 136, 0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--success);
            font-size: 0.95rem;
        }

        .privacy-item .pi-text {
            font-size: 0.85rem;
            color: var(--text-silver);
            line-height: 1.45;
        }

        .privacy-item .pi-text strong {
            color: var(--text-white);
            display: block;
            font-size: 0.9rem;
            margin-bottom: 2px;
        }

        @media (max-width: 991.98px) {
            .privacy-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 575.98px) {
            .privacy-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ============ CHANGELOG ============ */
        .changelog-list {
            display: flex;
            flex-direction: column;
            gap: 0;
            border-left: 2px solid var(--border-electric);
            padding-left: 20px;
        }

        .changelog-item {
            padding: 14px 0;
            position: relative;
        }

        .changelog-item::before {
            content: '';
            position: absolute;
            left: -26px;
            top: 21px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--accent);
            box-shadow: 0 0 12px var(--accent-glow);
        }

        .changelog-item .ch-version {
            font-weight: 700;
            color: var(--accent);
            font-size: 0.85rem;
            margin-bottom: 4px;
        }

        .changelog-item .ch-title {
            font-weight: 600;
            color: var(--text-white);
            font-size: 0.95rem;
            margin-bottom: 4px;
        }

        .changelog-item .ch-desc {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.5;
            margin-bottom: 0;
        }

        /* ============ BEGINNER STEPS ============ */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }

        .step-card {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 22px 18px;
            transition: all var(--transition-fast);
            position: relative;
            text-align: left;
        }

        .step-card:hover {
            border-color: var(--accent-dim);
            box-shadow: var(--shadow-neon);
            transform: translateY(-3px);
        }

        .step-card .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            font-weight: 800;
            font-size: 0.95rem;
            margin-bottom: 12px;
            box-shadow: 0 3px 14px rgba(0, 82, 255, 0.35);
        }

        .step-card h4 {
            font-size: 0.98rem;
            margin-bottom: 6px;
            color: var(--text-white);
        }

        .step-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.5;
        }

        @media (max-width: 991.98px) {
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 575.98px) {
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ============ FAQ ============ */
        .faq-accordion .accordion-item {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition-fast);
        }

        .faq-accordion .accordion-item:hover {
            border-color: var(--border-card);
        }

        .faq-accordion .accordion-button {
            background: transparent;
            color: var(--text-white);
            font-weight: 600;
            font-size: 0.95rem;
            padding: 16px 20px;
            box-shadow: none;
            border: none;
            transition: all var(--transition-fast);
        }

        .faq-accordion .accordion-button::after {
            color: var(--accent);
            font-size: 0.8rem;
        }

        .faq-accordion .accordion-button:not(.collapsed) {
            background: rgba(0, 240, 255, 0.06);
            color: var(--accent);
            box-shadow: none;
        }

        .faq-accordion .accordion-button:focus {
            box-shadow: none;
            outline: 2px solid var(--accent-dim);
            outline-offset: -2px;
        }

        .faq-accordion .accordion-body {
            padding: 16px 20px 20px;
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        /* ============ CTA FINAL ============ */
        .cta-final {
            background:
                linear-gradient(135deg, rgba(0, 82, 255, 0.18) 0%, rgba(0, 240, 255, 0.08) 50%, rgba(0, 82, 255, 0.12) 100%),
                var(--bg-navy);
            border: 1px solid var(--border-electric);
            border-radius: var(--radius-lg);
            padding: 42px 32px;
            text-align: center;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-card), var(--shadow-electric);
        }

        .cta-final::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
        }

        .cta-final h2 {
            font-size: clamp(1.4rem, 2.5vw, 2rem);
            margin-bottom: 0.75rem;
        }

        .cta-final p {
            color: var(--text-silver);
            max-width: 560px;
            margin: 0 auto 1.5rem;
            font-size: 1rem;
        }

        .cta-final .btn-group-cta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
        }

        /* ============ FOOTER ============ */
        .site-footer {
            background: #06070C;
            border-top: 1px solid var(--border-glass);
            padding: 48px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
            gap: 28px;
            margin-bottom: 30px;
        }

        .footer-brand .nav-brand-text {
            font-size: 1rem;
            max-width: 100%;
            white-space: normal;
        }

        .footer-brand p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 12px;
            line-height: 1.55;
            max-width: 280px;
        }

        .footer-col h5 {
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--text-white);
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 14px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-col ul li {
            margin-bottom: 8px;
        }

        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 0.85rem;
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-glass);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
        }

        .footer-bottom p {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin: 0;
        }

        .footer-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            align-items: center;
        }

        .footer-badges .badge-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 12px;
            border-radius: 50px;
            background: rgba(0, 240, 255, 0.06);
            border: 1px solid var(--border-glass);
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        .footer-badges .badge-item i {
            color: var(--success);
            font-size: 0.7rem;
        }

        @media (max-width: 991.98px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 575.98px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ============ FAB ============ */
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 1050;
            width: 52px;
            height: 52px;
            border-radius: 16px;
            background: rgba(8, 9, 15, 0.72);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 2px solid transparent;
            border-image: linear-gradient(135deg, #CCFF00, #00F0FF, #0052FF) 1;
            background-image: linear-gradient(135deg, rgba(0, 240, 255, 0.1), rgba(0, 82, 255, 0.08));
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 1.25rem;
            cursor: pointer;
            opacity: 0.65;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.35);
            transition: all var(--transition-fast);
            animation: fab-breathe 3s ease-in-out infinite;
        }

        .fab-left:hover {
            opacity: 1;
            transform: scale(1.08);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
            animation-play-state: paused;
        }

        .fab-left:active {
            transform: scale(0.94);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.4);
        }

        .fab-left .fab-notice {
            position: absolute;
            top: -3px;
            right: -3px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--danger);
            box-shadow: 0 0 10px var(--danger-glow);
            animation: fab-blink 1.4s ease-in-out infinite;
        }

        @keyframes fab-breathe {
            0%, 100% {
                box-shadow: 0 0 18px rgba(0, 240, 255, 0.35);
                transform: translateY(0);
            }
            50% {
                box-shadow: 0 0 26px rgba(0, 240, 255, 0.55);
                transform: translateY(-3px);
            }
        }

        @keyframes fab-blink {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.3; }
        }

        @media (max-width: 575.98px) {
            .fab-left {
                width: 46px;
                height: 46px;
                border-radius: 14px;
                font-size: 1.05rem;
                left: 12px;
                bottom: 18px;
            }
        }

        /* ============ RESPONSIVE EXTRA ============ */
        @media (max-width: 767.98px) {
            .section {
                padding-top: 44px;
                padding-bottom: 44px;
            }
            .section-title-group {
                margin-bottom: 1.8rem;
            }
            .section-desc {
                font-size: 0.95rem;
            }
        }

        @media (max-width: 575.98px) {
            .section {
                padding-top: 36px;
                padding-bottom: 36px;
            }
            .hero-title {
                font-size: 1.7rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .btn-primary-glow,
            .btn-outline-glow {
                padding: 10px 18px;
                font-size: 0.86rem;
            }
            .lead-form-card {
                padding: 20px 18px;
            }
            .changelog-list {
                padding-left: 14px;
            }
            .changelog-item::before {
                left: -19px;
                width: 8px;
                height: 8px;
            }
            .cta-final {
                padding: 30px 18px;
            }
        }

/* roulang page: category1 */
:root {
            --bg-deep: #08090F;
            --bg-navy: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.72);
            --bg-glass: rgba(255, 255, 255, 0.04);
            --blue-electric: #0052FF;
            --cyan-neon: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #8A94A6;
            --border-glow: rgba(0, 82, 255, 0.35);
            --border-cyan: rgba(0, 240, 255, 0.25);
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-blue: 0 0 25px rgba(0, 82, 255, 0.35);
            --radius-lg: 20px;
            --radius-md: 14px;
            --radius-sm: 10px;
            --spacing-section: 80px;
            --font-family: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            background-color: var(--bg-deep);
            background-image: 
                radial-gradient(ellipse at 20% 10%, rgba(0, 82, 255, 0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 80% 20%, rgba(0, 240, 255, 0.07) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 80%, rgba(0, 82, 255, 0.05) 0%, transparent 60%);
            color: var(--text-white);
            line-height: 1.65;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.25s ease;
        }

        a:hover {
            color: var(--cyan-neon);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }

        .container {
            max-width: 1200px;
            width: 100%;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* ============ HEADER / NAV ============ */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(8, 9, 15, 0.88);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 82, 255, 0.2);
            transition: box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 82, 255, 0.15);
        }

        .site-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            min-height: 72px;
            flex-wrap: wrap;
            padding: 8px 0;
        }

        .nav-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .nav-brand-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.25), rgba(0, 240, 255, 0.15));
            border: 1px solid rgba(0, 240, 255, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--cyan-neon);
            transition: all 0.3s ease;
        }

        .nav-brand:hover .nav-brand-icon {
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.4);
            transform: scale(1.05);
        }

        .nav-brand-text {
            font-weight: 800;
            font-size: 1.1rem;
            letter-spacing: -0.01em;
            color: var(--text-white);
            line-height: 1.2;
            white-space: nowrap;
        }

        .nav-brand-text span {
            color: var(--cyan-neon);
            font-weight: 700;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            list-style: none;
            gap: 6px;
            margin: 0;
            padding: 0;
            flex-wrap: wrap;
        }

        .nav-link {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 10px 16px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.92rem;
            color: var(--text-silver);
            transition: all 0.3s ease;
            white-space: nowrap;
            position: relative;
        }

        .nav-link i {
            font-size: 0.85rem;
            opacity: 0.85;
        }

        .nav-link:hover {
            color: var(--text-white);
            background: rgba(0, 82, 255, 0.15);
            box-shadow: 0 0 15px rgba(0, 82, 255, 0.2);
        }

        .nav-link.active {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.35), rgba(0, 240, 255, 0.2));
            color: var(--text-white);
            border: 1px solid rgba(0, 240, 255, 0.35);
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.3);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .btn-login,
        .btn-signup {
            padding: 10px 20px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.9rem;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .btn-login {
            background: transparent;
            color: var(--text-white);
            border: 1px solid rgba(255, 255, 255, 0.25);
        }

        .btn-login:hover {
            border-color: var(--cyan-neon);
            color: var(--cyan-neon);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
        }

        .btn-signup {
            background: linear-gradient(135deg, #0052FF, #00C2FF);
            color: #fff;
            border: 1px solid rgba(0, 240, 255, 0.4);
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.35);
        }

        .btn-signup:hover {
            box-shadow: 0 0 35px rgba(0, 82, 255, 0.6);
            transform: translateY(-2px);
            background: linear-gradient(135deg, #0060FF, #00D4FF);
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: rgba(0, 82, 255, 0.15);
            border: 1px solid rgba(0, 240, 255, 0.25);
            color: var(--text-white);
            font-size: 1.2rem;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
        }

        .nav-toggle:hover {
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
        }

        /* ============ HERO ============ */
        .hero-section {
            position: relative;
            padding: 150px 0 80px;
            background-image: 
                linear-gradient(rgba(8, 9, 15, 0.75), rgba(13, 17, 30, 0.85)),
                url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            border-bottom: 1px solid rgba(0, 82, 255, 0.2);
            overflow: hidden;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 120px;
            background: linear-gradient(to bottom, transparent, var(--bg-deep));
            pointer-events: none;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 50px;
            align-items: center;
            position: relative;
            z-index: 2;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            border-radius: 30px;
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid rgba(0, 240, 255, 0.3);
            color: var(--cyan-neon);
            font-weight: 700;
            font-size: 0.85rem;
            letter-spacing: 0.02em;
            margin-bottom: 20px;
        }

        .hero-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #00FF88;
            animation: pulse-dot 1.6s ease-in-out infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; box-shadow: 0 0 8px rgba(0, 255, 136, 0.7); }
            50% { opacity: 0.5; box-shadow: 0 0 2px rgba(0, 255, 136, 0.3); }
        }

        .hero-title {
            font-size: 3.1rem;
            font-weight: 900;
            line-height: 1.18;
            letter-spacing: -0.02em;
            margin-bottom: 20px;
            color: var(--text-white);
        }

        .hero-title .highlight {
            background: linear-gradient(135deg, #00F0FF, #0052FF);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: transparent;
        }

        .hero-subtitle {
            font-size: 1.1rem;
            color: var(--text-silver);
            line-height: 1.7;
            max-width: 560px;
            margin-bottom: 30px;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-wrap: wrap;
        }

        .btn-primary-glow {
            padding: 14px 34px;
            border-radius: 40px;
            background: linear-gradient(135deg, #0052FF, #00C2FF);
            color: #fff;
            font-weight: 800;
            font-size: 1rem;
            letter-spacing: 0.01em;
            border: 1px solid rgba(0, 240, 255, 0.45);
            box-shadow: 0 0 30px rgba(0, 82, 255, 0.45);
            transition: all 0.35s ease;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .btn-primary-glow:hover {
            box-shadow: 0 0 50px rgba(0, 82, 255, 0.7), 0 0 25px rgba(0, 240, 255, 0.35);
            transform: translateY(-3px);
            background: linear-gradient(135deg, #0060FF, #00D4FF);
            color: #fff;
        }

        .btn-secondary-outline {
            padding: 14px 28px;
            border-radius: 40px;
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-white);
            font-weight: 700;
            font-size: 1rem;
            border: 1px solid rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .btn-secondary-outline:hover {
            border-color: var(--cyan-neon);
            color: var(--cyan-neon);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
        }

        .hero-visual {
            position: relative;
        }

        .hero-visual-card {
            background: var(--bg-glass);
            backdrop-filter: blur(25px);
            -webkit-backdrop-filter: blur(25px);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 82, 255, 0.15);
            position: relative;
            overflow: hidden;
        }

        .hero-visual-card::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            border-radius: var(--radius-lg);
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.4), rgba(0, 82, 255, 0.2), transparent);
            z-index: -1;
            opacity: 0.6;
        }

        .hero-visual-card img {
            border-radius: var(--radius-md);
            margin-bottom: 18px;
            width: 100%;
            object-fit: cover;
        }

        .hero-stats {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .stat-chip {
            flex: 1;
            min-width: 80px;
            text-align: center;
            padding: 14px 12px;
            border-radius: var(--radius-sm);
            background: rgba(0, 82, 255, 0.1);
            border: 1px solid rgba(0, 82, 255, 0.25);
        }

        .stat-chip .stat-value {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--cyan-neon);
            display: block;
            line-height: 1.2;
        }

        .stat-chip .stat-label {
            font-size: 0.78rem;
            color: var(--text-muted);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.03em;
        }

        /* ============ SECTION COMMON ============ */
        .section-block {
            padding: var(--spacing-section) 0;
            position: relative;
        }

        .section-block.alt-bg {
            background: var(--bg-navy);
            border-top: 1px solid rgba(0, 82, 255, 0.15);
            border-bottom: 1px solid rgba(0, 82, 255, 0.15);
        }

        .section-header {
            margin-bottom: 45px;
        }

        .section-label {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 30px;
            background: rgba(0, 82, 255, 0.12);
            border: 1px solid rgba(0, 82, 255, 0.3);
            color: var(--cyan-neon);
            font-weight: 700;
            font-size: 0.82rem;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            margin-bottom: 14px;
        }

        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.01em;
            color: var(--text-white);
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 1.02rem;
            color: var(--text-silver);
            max-width: 680px;
            line-height: 1.7;
        }

        /* ============ FEATURE GRID ============ */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .feature-card {
            background: var(--bg-glass);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: all 0.35s ease;
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--blue-electric), var(--cyan-neon));
            opacity: 0;
            transition: opacity 0.35s ease;
        }

        .feature-card:hover {
            transform: translateY(-6px);
            border-color: rgba(0, 240, 255, 0.25);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4), 0 0 25px rgba(0, 82, 255, 0.2);
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-icon {
            width: 54px;
            height: 54px;
            border-radius: 14px;
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.25), rgba(0, 240, 255, 0.15));
            border: 1px solid rgba(0, 240, 255, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--cyan-neon);
            margin-bottom: 18px;
            transition: all 0.3s ease;
        }

        .feature-card:hover .feature-icon {
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.35);
            transform: scale(1.08);
        }

        .feature-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 10px;
        }

        .feature-text {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.65;
            margin-bottom: 0;
        }

        /* ============ VALUE PROPOSITION ============ */
        .value-layout {
            display: grid;
            grid-template-columns: 0.9fr 1.1fr;
            gap: 50px;
            align-items: center;
        }

        .value-image-wrap {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid rgba(0, 82, 255, 0.2);
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
        }

        .value-image-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .value-image-wrap::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60%;
            background: linear-gradient(to top, rgba(8, 9, 15, 0.7), transparent);
            pointer-events: none;
        }

        .value-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .value-list li {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 16px 18px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.07);
            transition: all 0.3s ease;
        }

        .value-list li:hover {
            border-color: rgba(0, 240, 255, 0.25);
            background: rgba(0, 82, 255, 0.08);
        }

        .value-list li i {
            color: var(--cyan-neon);
            font-size: 1.1rem;
            margin-top: 3px;
            flex-shrink: 0;
        }

        .value-list li strong {
            display: block;
            color: var(--text-white);
            font-weight: 700;
            font-size: 0.98rem;
            margin-bottom: 3px;
        }

        .value-list li span {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        /* ============ SCENARIO / CASES ============ */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 22px;
        }

        .scenario-card {
            background: var(--bg-glass);
            backdrop-filter: blur(18px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all 0.35s ease;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .scenario-card:hover {
            border-color: rgba(0, 240, 255, 0.3);
            box-shadow: 0 12px 35px rgba(0, 0, 0, 0.4), 0 0 20px rgba(0, 82, 255, 0.2);
            transform: translateY(-4px);
        }

        .scenario-card .scenario-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            background: rgba(0, 82, 255, 0.15);
            border: 1px solid rgba(0, 82, 255, 0.3);
            color: var(--cyan-neon);
            font-size: 0.78rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            width: fit-content;
        }

        .scenario-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-white);
            margin: 0;
        }

        .scenario-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.65;
            margin: 0;
        }

        /* ============ STEPS / HOW TO ============ */
        .steps-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
            counter-reset: step;
        }

        .step-item {
            position: relative;
            background: var(--bg-glass);
            backdrop-filter: blur(15px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            padding: 28px 20px 22px;
            transition: all 0.3s ease;
            counter-increment: step;
        }

        .step-item:hover {
            border-color: rgba(0, 240, 255, 0.3);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35), 0 0 18px rgba(0, 82, 255, 0.18);
        }

        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: linear-gradient(135deg, #0052FF, #00C2FF);
            color: #fff;
            font-weight: 800;
            font-size: 1.05rem;
            margin-bottom: 16px;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.4);
        }

        .step-item h4 {
            font-size: 1.02rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 8px;
        }

        .step-item p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin: 0;
        }

        /* ============ SUCCESS / TESTIMONIAL ============ */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }

        .testimonial-card {
            background: var(--bg-glass);
            backdrop-filter: blur(18px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            padding: 26px 22px;
            transition: all 0.3s ease;
            position: relative;
        }

        .testimonial-card::before {
            content: '\201C';
            position: absolute;
            top: 10px;
            right: 20px;
            font-size: 3.5rem;
            color: rgba(0, 240, 255, 0.15);
            font-family: serif;
            line-height: 1;
            pointer-events: none;
        }

        .testimonial-card:hover {
            border-color: rgba(0, 240, 255, 0.25);
            transform: translateY(-4px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.35);
        }

        .testimonial-stars {
            color: #FFD700;
            font-size: 0.9rem;
            margin-bottom: 12px;
            letter-spacing: 2px;
        }

        .testimonial-text {
            color: var(--text-silver);
            font-size: 0.92rem;
            line-height: 1.7;
            margin-bottom: 16px;
            font-style: italic;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .testimonial-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.3), rgba(0, 240, 255, 0.2));
            border: 1px solid rgba(0, 240, 255, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--cyan-neon);
            font-weight: 700;
            font-size: 0.9rem;
        }

        .testimonial-author-name {
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--text-white);
        }

        .testimonial-author-role {
            font-size: 0.78rem;
            color: var(--text-muted);
        }

        /* ============ FAQ ============ */
        .faq-wrapper {
            max-width: 820px;
            margin: 0 auto;
        }

        .accordion-item {
            background: var(--bg-glass);
            backdrop-filter: blur(15px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-sm);
            margin-bottom: 14px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .accordion-item:hover {
            border-color: rgba(0, 240, 255, 0.2);
        }

        .accordion-button {
            background: transparent;
            color: var(--text-white);
            font-weight: 700;
            font-size: 1rem;
            padding: 20px 22px;
            border: none;
            width: 100%;
            text-align: left;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            transition: all 0.3s ease;
        }

        .accordion-button:not(.collapsed) {
            color: var(--cyan-neon);
        }

        .accordion-button::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.85rem;
            transition: transform 0.3s ease;
            color: var(--text-muted);
        }

        .accordion-button:not(.collapsed)::after {
            transform: rotate(180deg);
            color: var(--cyan-neon);
        }

        .accordion-button:focus {
            outline: 2px solid rgba(0, 240, 255, 0.4);
            outline-offset: -2px;
        }

        .accordion-body {
            padding: 0 22px 20px;
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        /* ============ CTA ============ */
        .cta-section {
            padding: 70px 0;
            position: relative;
            background-image: 
                linear-gradient(rgba(8, 9, 15, 0.7), rgba(13, 17, 30, 0.8)),
                url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            border-radius: 0;
            border-top: 1px solid rgba(0, 82, 255, 0.2);
            border-bottom: 1px solid rgba(0, 82, 255, 0.2);
        }

        .cta-card {
            text-align: center;
            max-width: 700px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.04);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            box-shadow: 0 25px 60px rgba(0, 0, 0, 0.45), 0 0 40px rgba(0, 82, 255, 0.15);
        }

        .cta-card h2 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }

        .cta-card p {
            color: var(--text-silver);
            font-size: 1.02rem;
            line-height: 1.7;
            margin-bottom: 26px;
        }

        .cta-actions {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 14px;
            flex-wrap: wrap;
        }

        /* ============ FLOATING ACTION BUTTON ============ */
        .fab-float {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.75);
            backdrop-filter: blur(10px);
            border: 2px solid rgba(0, 240, 255, 0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--cyan-neon);
            font-size: 1.25rem;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            cursor: pointer;
            transition: all 0.3s ease;
            opacity: 0.6;
            animation: fab-pulse 3s ease-in-out infinite;
        }

        .fab-float:hover {
            opacity: 1;
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.7), 0 0 50px rgba(0, 82, 255, 0.3);
            transform: scale(1.1);
            animation: none;
        }

        .fab-float:active {
            transform: scale(0.95);
        }

        .fab-float .fab-notif {
            position: absolute;
            top: 2px;
            right: 2px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #FF0055;
            border: 2px solid #08090F;
            animation: blink-red 2s ease-in-out infinite;
        }

        @keyframes fab-pulse {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-6px); }
        }

        @keyframes blink-red {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.3; }
        }

        /* ============ FOOTER ============ */
        .site-footer {
            background: var(--bg-deep);
            border-top: 1px solid rgba(0, 82, 255, 0.2);
            padding: 60px 0 30px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand .nav-brand-text {
            display: block;
            margin-bottom: 14px;
            font-size: 1.2rem;
            font-weight: 800;
        }

        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.88rem;
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-col h5 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: 0.01em;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 0.88rem;
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .footer-col ul li a:hover {
            color: var(--cyan-neon);
            transform: translateX(3px);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }

        .footer-bottom p {
            color: var(--text-muted);
            font-size: 0.8rem;
            margin: 0;
        }

        .footer-badges {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .badge-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: 20px;
            background: rgba(0, 82, 255, 0.1);
            border: 1px solid rgba(0, 82, 255, 0.25);
            color: var(--text-silver);
            font-size: 0.78rem;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .badge-item:hover {
            border-color: rgba(0, 240, 255, 0.4);
            color: var(--cyan-neon);
        }

        .badge-item i {
            color: #00FF88;
            font-size: 0.7rem;
        }

        /* ============ RESPONSIVE ============ */
        @media (max-width: 1024px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .testimonial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .value-layout {
                grid-template-columns: 1fr;
                gap: 35px;
            }
        }

        @media (max-width: 768px) {
            .site-nav {
                gap: 12px;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                align-items: stretch;
                width: 100%;
                padding: 12px 0;
                gap: 4px;
                background: rgba(8, 9, 15, 0.95);
                backdrop-filter: blur(15px);
                border-radius: 0 0 16px 16px;
                border: 1px solid rgba(0, 82, 255, 0.2);
                border-top: none;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-link {
                padding: 12px 16px;
                border-radius: 10px;
                font-size: 0.95rem;
            }
            .nav-actions {
                gap: 6px;
            }
            .btn-login,
            .btn-signup {
                padding: 8px 14px;
                font-size: 0.82rem;
            }
            .nav-toggle {
                display: flex;
            }
            .hero-section {
                padding: 120px 0 60px;
            }
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 35px;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .btn-primary-glow,
            .btn-secondary-outline {
                justify-content: center;
                text-align: center;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .steps-row {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .testimonial-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .scenario-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .cta-card {
                padding: 35px 22px;
            }
            .cta-card h2 {
                font-size: 1.6rem;
            }
            .cta-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 26px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }
            .fab-float {
                width: 50px;
                height: 50px;
                bottom: 80px;
                left: 12px;
                font-size: 1.1rem;
            }
            :root {
                --spacing-section: 55px;
            }
        }

        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.7rem;
            }
            .hero-badge {
                font-size: 0.75rem;
                padding: 6px 14px;
            }
            .section-title {
                font-size: 1.45rem;
            }
            .btn-primary-glow,
            .btn-secondary-outline {
                padding: 12px 20px;
                font-size: 0.9rem;
            }
            .nav-brand-text {
                font-size: 0.95rem;
            }
            .nav-brand-icon {
                width: 38px;
                height: 38px;
                font-size: 1.1rem;
            }
            .site-nav {
                min-height: 62px;
            }
            .hero-section {
                padding: 105px 0 50px;
            }
            .container {
                padding-left: 14px;
                padding-right: 14px;
            }
        }

/* roulang page: article */
:root {
            --bg-deep: #08090F;
            --bg-navy: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.85);
            --bg-glass: rgba(13, 17, 30, 0.65);
            --blue-electric: #0052FF;
            --cyan-neon: #00F0FF;
            --blue-glow: rgba(0, 82, 255, 0.45);
            --cyan-glow: rgba(0, 240, 255, 0.35);
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-dark: rgba(0, 240, 255, 0.15);
            --border-glow: rgba(0, 240, 255, 0.4);
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 22px;
            --radius-xl: 30px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 24px rgba(0, 240, 255, 0.25);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-body: 'Segoe UI', 'Inter', system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
            --font-heading: 'Segoe UI', 'Inter', system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 2.5rem;
            --spacing-xl: 4rem;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-body);
            background: var(--bg-deep);
            background-image: radial-gradient(circle at 20% 20%, rgba(0, 82, 255, 0.12) 0%, transparent 45%), radial-gradient(circle at 80% 70%, rgba(0, 240, 255, 0.08) 0%, transparent 40%);
            color: var(--text-white);
            line-height: 1.65;
            min-height: 100vh;
            overflow-x: hidden;
            position: relative;
        }

        body::before {
            content: '';
            position: fixed;
            inset: 0;
            background-image: radial-gradient(rgba(0, 240, 255, 0.05) 1px, transparent 1px);
            background-size: 42px 42px;
            z-index: 0;
            pointer-events: none;
        }

        a {
            color: var(--cyan-neon);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover,
        a:focus {
            color: #fff;
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--cyan-neon);
            outline-offset: 3px;
            border-radius: 4px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ====== Container ====== */
        .container {
            max-width: 1140px;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
            position: relative;
            z-index: 1;
        }

        /* ====== Header / Nav ====== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            background: rgba(8, 9, 15, 0.82);
            backdrop-filter: blur(22px);
            -webkit-backdrop-filter: blur(22px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.12);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.45);
            transition: var(--transition);
        }

        .site-header.scrolled {
            background: rgba(8, 9, 15, 0.96);
            border-bottom-color: rgba(0, 240, 255, 0.25);
            box-shadow: 0 6px 38px rgba(0, 240, 255, 0.12);
        }

        .site-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            min-height: 72px;
            flex-wrap: nowrap;
        }

        .nav-brand {
            display: flex;
            align-items: center;
            gap: 0.65rem;
            color: var(--text-white);
            font-weight: 700;
            font-size: 1.2rem;
            letter-spacing: -0.02em;
            white-space: nowrap;
            transition: var(--transition);
        }

        .nav-brand:hover {
            color: var(--cyan-neon);
            text-shadow: 0 0 14px rgba(0, 240, 255, 0.55);
        }

        .nav-brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(145deg, rgba(0, 82, 255, 0.3), rgba(0, 240, 255, 0.15));
            border: 1px solid rgba(0, 240, 255, 0.45);
            color: var(--cyan-neon);
            font-size: 1.25rem;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.25);
            transition: var(--transition);
            flex-shrink: 0;
        }

        .nav-brand:hover .nav-brand-icon {
            box-shadow: 0 0 32px rgba(0, 240, 255, 0.55);
            transform: scale(1.05);
        }

        .nav-brand-text {
            font-size: 1.13rem;
            line-height: 1.25;
            font-weight: 700;
        }

        .nav-brand-text span {
            color: var(--cyan-neon);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            margin: 0;
            padding: 0;
        }

        .nav-menu li {
            list-style: none;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.55rem 0.95rem;
            border-radius: 30px;
            color: var(--text-silver);
            font-size: 0.9rem;
            font-weight: 500;
            letter-spacing: 0.01em;
            transition: var(--transition);
            white-space: nowrap;
            border: 1px solid transparent;
        }

        .nav-link i {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: var(--transition);
        }

        .nav-link:hover {
            color: #fff;
            background: rgba(0, 240, 255, 0.1);
            border-color: rgba(0, 240, 255, 0.25);
            text-shadow: 0 0 8px rgba(255, 255, 255, 0.4);
        }

        .nav-link:hover i {
            color: var(--cyan-neon);
        }

        .nav-link.active {
            color: #fff;
            background: rgba(0, 82, 255, 0.25);
            border-color: rgba(0, 240, 255, 0.5);
            box-shadow: 0 0 16px rgba(0, 82, 255, 0.35);
        }

        .nav-link.active i {
            color: var(--cyan-neon);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            flex-shrink: 0;
        }

        .btn-login {
            background: transparent;
            border: 1px solid rgba(0, 240, 255, 0.35);
            color: var(--cyan-neon);
            padding: 0.5rem 1.15rem;
            border-radius: 30px;
            font-size: 0.88rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-login:hover {
            background: rgba(0, 240, 255, 0.15);
            border-color: var(--cyan-neon);
            color: #fff;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.3);
        }

        .btn-signup {
            background: linear-gradient(145deg, var(--blue-electric), #0039cc);
            border: 1px solid rgba(0, 240, 255, 0.5);
            color: #fff;
            padding: 0.55rem 1.25rem;
            border-radius: 30px;
            font-size: 0.88rem;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
            box-shadow: 0 0 18px rgba(0, 82, 255, 0.5);
            letter-spacing: 0.02em;
        }

        .btn-signup:hover {
            background: linear-gradient(145deg, #0a5aff, #0052FF);
            box-shadow: 0 0 32px rgba(0, 240, 255, 0.6);
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-signup:active {
            transform: translateY(0);
            box-shadow: 0 0 14px rgba(0, 82, 255, 0.4);
        }

        .nav-toggle {
            display: none;
            background: transparent;
            border: 1px solid rgba(0, 240, 255, 0.3);
            color: var(--cyan-neon);
            width: 42px;
            height: 42px;
            border-radius: 12px;
            font-size: 1.3rem;
            cursor: pointer;
            transition: var(--transition);
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .nav-toggle:hover {
            background: rgba(0, 240, 255, 0.15);
            border-color: var(--cyan-neon);
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.35);
        }

        /* ====== Article Hero / Breadcrumb ====== */
        .article-hero {
            position: relative;
            padding: 130px 0 3rem;
            background: linear-gradient(180deg, rgba(0, 82, 255, 0.22) 0%, rgba(8, 9, 15, 0.6) 55%, var(--bg-deep) 100%);
            border-bottom: 1px solid rgba(0, 240, 255, 0.12);
            z-index: 1;
            overflow: hidden;
        }

        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.14;
            z-index: 0;
            pointer-events: none;
        }

        .article-hero .container {
            position: relative;
            z-index: 2;
        }

        .article-breadcrumb .breadcrumb {
            margin-bottom: 1.5rem;
            background: rgba(13, 17, 30, 0.6);
            border: 1px solid rgba(0, 240, 255, 0.15);
            border-radius: var(--radius-sm);
            padding: 0.55rem 1rem;
            font-size: 0.85rem;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            display: inline-flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.3rem;
        }

        .article-breadcrumb .breadcrumb-item {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            color: var(--text-muted);
        }

        .article-breadcrumb .breadcrumb-item a {
            color: var(--cyan-neon);
            font-weight: 500;
        }

        .article-breadcrumb .breadcrumb-item a:hover {
            color: #fff;
            text-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
        }

        .article-breadcrumb .breadcrumb-item.active {
            color: var(--text-silver);
            font-weight: 500;
        }

        .article-breadcrumb .breadcrumb-item+.breadcrumb-item::before {
            content: '›';
            color: rgba(0, 240, 255, 0.6);
            padding: 0 0.15rem;
            font-size: 1rem;
            line-height: 1;
        }

        .article-title-block {
            padding: 1rem 0 0.5rem;
        }

        .article-title-tags {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.6rem;
            margin-bottom: 1rem;
        }

        .tag-category {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: rgba(0, 82, 255, 0.25);
            border: 1px solid rgba(0, 240, 255, 0.45);
            color: var(--cyan-neon);
            padding: 0.3rem 0.85rem;
            border-radius: 30px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }

        .tag-date {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            color: var(--text-muted);
            font-size: 0.82rem;
        }

        .tag-date i {
            color: var(--cyan-neon);
            font-size: 0.8rem;
        }

        .article-title-block h1 {
            font-size: clamp(1.75rem, 4.5vw, 2.8rem);
            font-weight: 800;
            letter-spacing: -0.025em;
            line-height: 1.25;
            color: var(--text-white);
            text-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
            margin-bottom: 1rem;
            max-width: 860px;
        }

        .article-meta-row {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            padding: 0.5rem 0 1rem;
            border-top: 1px solid rgba(0, 240, 255, 0.15);
            font-size: 0.88rem;
            color: var(--text-muted);
        }

        .article-meta-row span {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }

        .article-meta-row i {
            color: var(--cyan-neon);
            font-size: 0.82rem;
        }

        /* ====== Article Body ====== */
        .article-body-section {
            padding: 3rem 0 2.5rem;
            position: relative;
            z-index: 1;
        }

        .article-body-card {
            background: var(--bg-glass);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid rgba(0, 240, 255, 0.18);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            padding: 2.5rem;
            transition: var(--transition);
        }

        .article-body-card:hover {
            border-color: rgba(0, 240, 255, 0.35);
            box-shadow: 0 10px 44px rgba(0, 0, 0, 0.55), 0 0 28px rgba(0, 240, 255, 0.12);
        }

        .article-content {
            font-size: 1.05rem;
            line-height: 1.75;
            color: var(--text-silver);
            max-width: 100%;
        }

        .article-content h1,
        .article-content h2,
        .article-content h3,
        .article-content h4,
        .article-content h5,
        .article-content h6 {
            color: var(--text-white);
            font-weight: 700;
            margin-top: 1.8rem;
            margin-bottom: 1rem;
            letter-spacing: -0.01em;
            line-height: 1.35;
        }

        .article-content h2 {
            font-size: 1.55rem;
            border-left: 4px solid var(--cyan-neon);
            padding-left: 1rem;
            text-shadow: 0 0 12px rgba(0, 240, 255, 0.2);
        }

        .article-content h3 {
            font-size: 1.3rem;
            color: #e2f3ff;
        }

        .article-content h4 {
            font-size: 1.15rem;
            color: var(--cyan-neon);
        }

        .article-content p {
            margin-bottom: 1.15rem;
            color: var(--text-silver);
        }

        .article-content strong {
            color: #fff;
            font-weight: 700;
        }

        .article-content em {
            color: var(--cyan-neon);
            font-style: italic;
        }

        .article-content a {
            color: var(--cyan-neon);
            font-weight: 500;
            border-bottom: 1px dashed rgba(0, 240, 255, 0.5);
            transition: var(--transition);
        }

        .article-content a:hover {
            color: #fff;
            border-bottom-color: #fff;
        }

        .article-content ul,
        .article-content ol {
            margin: 1rem 0 1.3rem 1.5rem;
            padding-left: 0;
        }

        .article-content ul li {
            list-style: none;
            position: relative;
            padding-left: 1.6rem;
            margin-bottom: 0.55rem;
            color: var(--text-silver);
        }

        .article-content ul li::before {
            content: '\f0da';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            top: 0.05rem;
            color: var(--cyan-neon);
            font-size: 0.82rem;
        }

        .article-content ol {
            counter-reset: item;
        }

        .article-content ol li {
            list-style: none;
            counter-increment: item;
            position: relative;
            padding-left: 2rem;
            margin-bottom: 0.55rem;
            color: var(--text-silver);
        }

        .article-content ol li::before {
            content: counter(item);
            position: absolute;
            left: 0;
            top: 0.05rem;
            width: 1.35rem;
            height: 1.35rem;
            background: rgba(0, 82, 255, 0.3);
            border: 1px solid rgba(0, 240, 255, 0.4);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 0.72rem;
            color: var(--cyan-neon);
            font-weight: 700;
        }

        .article-content blockquote {
            background: rgba(0, 82, 255, 0.12);
            border-left: 5px solid var(--cyan-neon);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            padding: 1.15rem 1.5rem;
            margin: 1.5rem 0;
            font-style: italic;
            color: #e2f3ff;
            font-size: 1rem;
            line-height: 1.7;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.08);
        }

        .article-content blockquote p {
            margin-bottom: 0;
            color: inherit;
        }

        .article-content img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-md);
            margin: 1.2rem 0;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
            border: 1px solid rgba(0, 240, 255, 0.2);
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            background: rgba(13, 17, 30, 0.7);
            border-radius: var(--radius-sm);
            overflow: hidden;
            border: 1px solid rgba(0, 240, 255, 0.2);
        }

        .article-content table th,
        .article-content table td {
            padding: 0.8rem 1rem;
            text-align: left;
            border-bottom: 1px solid rgba(0, 240, 255, 0.12);
            color: var(--text-silver);
            font-size: 0.95rem;
        }

        .article-content table th {
            background: rgba(0, 82, 255, 0.25);
            color: #fff;
            font-weight: 700;
            letter-spacing: 0.02em;
        }

        .article-content table tr:last-child td {
            border-bottom: none;
        }

        .article-content table tr:hover td {
            background: rgba(0, 240, 255, 0.06);
        }

        .article-content code {
            background: rgba(0, 240, 255, 0.1);
            padding: 0.15rem 0.45rem;
            border-radius: 4px;
            font-size: 0.85em;
            color: var(--cyan-neon);
            border: 1px solid rgba(0, 240, 255, 0.2);
        }

        .article-content pre {
            background: rgba(13, 17, 30, 0.9);
            border: 1px solid rgba(0, 240, 255, 0.2);
            border-radius: var(--radius-sm);
            padding: 1.2rem;
            overflow-x: auto;
            margin: 1.2rem 0;
        }

        .article-content pre code {
            background: transparent;
            padding: 0;
            border: none;
            color: var(--text-silver);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .article-not-found {
            text-align: center;
            padding: 3.5rem 1rem;
            color: var(--text-muted);
        }

        .article-not-found i {
            font-size: 3rem;
            color: rgba(0, 240, 255, 0.5);
            margin-bottom: 1rem;
            display: block;
        }

        .article-not-found h3 {
            color: var(--text-white);
            font-size: 1.5rem;
            margin-bottom: 0.6rem;
        }

        .article-not-found p {
            color: var(--text-muted);
            margin-bottom: 1.5rem;
        }

        /* ====== Related Articles ====== */
        .related-section {
            padding: 2.5rem 0 3rem;
            position: relative;
            z-index: 1;
        }

        .section-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            margin-bottom: 1.8rem;
            flex-wrap: wrap;
        }

        .section-header h2 {
            font-size: 1.55rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--text-white);
            margin-bottom: 0;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }

        .section-header h2 i {
            color: var(--cyan-neon);
            font-size: 1.3rem;
            text-shadow: 0 0 12px rgba(0, 240, 255, 0.6);
        }

        .section-line {
            flex: 1;
            height: 1px;
            background: linear-gradient(90deg, rgba(0, 240, 255, 0.35), transparent);
        }

        .related-card {
            background: var(--bg-card);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid rgba(0, 240, 255, 0.18);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .related-card:hover {
            border-color: rgba(0, 240, 255, 0.45);
            box-shadow: 0 10px 36px rgba(0, 0, 0, 0.55), 0 0 26px rgba(0, 240, 255, 0.15);
            transform: translateY(-5px);
        }

        .related-card-img {
            width: 100%;
            height: 185px;
            object-fit: cover;
            background: linear-gradient(145deg, var(--bg-navy), #141a2e);
        }

        .related-card-body {
            padding: 1.15rem 1.25rem 1.3rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .related-card-tag {
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--cyan-neon);
            letter-spacing: 0.03em;
            text-transform: uppercase;
            margin-bottom: 0.5rem;
        }

        .related-card-body h3 {
            font-size: 1.02rem;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-white);
            margin-bottom: 0.7rem;
            letter-spacing: -0.01em;
            transition: var(--transition);
        }

        .related-card:hover .related-card-body h3 {
            color: var(--cyan-neon);
        }

        .related-card-body a {
            color: inherit;
        }

        .related-card-body a:hover {
            color: var(--cyan-neon);
        }

        .related-card-date {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.78rem;
            color: var(--text-muted);
            margin-top: auto;
        }

        .related-card-date i {
            color: var(--cyan-neon);
            font-size: 0.72rem;
        }

        /* ====== CTA Section ====== */
        .cta-section {
            padding: 3.5rem 0 4rem;
            position: relative;
            z-index: 1;
        }

        .cta-box {
            background: linear-gradient(145deg, rgba(0, 82, 255, 0.22), rgba(13, 17, 30, 0.9));
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: var(--radius-xl);
            padding: 2.8rem 2rem;
            text-align: center;
            box-shadow: 0 0 40px rgba(0, 82, 255, 0.25), 0 0 60px rgba(0, 240, 255, 0.1);
            position: relative;
            overflow: hidden;
        }

        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.1;
            z-index: 0;
            pointer-events: none;
        }

        .cta-box>* {
            position: relative;
            z-index: 1;
        }

        .cta-box h2 {
            font-size: clamp(1.4rem, 3.5vw, 2rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--text-white);
            margin-bottom: 0.9rem;
            text-shadow: 0 0 24px rgba(0, 240, 255, 0.35);
        }

        .cta-box p {
            color: var(--text-silver);
            font-size: 1.02rem;
            max-width: 580px;
            margin: 0 auto 1.5rem;
            line-height: 1.7;
        }

        .btn-glow {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            background: linear-gradient(145deg, var(--blue-electric), #0039cc);
            border: 1px solid rgba(0, 240, 255, 0.55);
            color: #fff;
            padding: 0.85rem 2rem;
            border-radius: 40px;
            font-size: 1rem;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 0 26px rgba(0, 82, 255, 0.55);
            letter-spacing: 0.02em;
            text-decoration: none;
        }

        .btn-glow:hover {
            background: linear-gradient(145deg, #0a5aff, #0052FF);
            box-shadow: 0 0 42px rgba(0, 240, 255, 0.7);
            transform: translateY(-3px);
            color: #fff;
        }

        .btn-glow:active {
            transform: translateY(0);
            box-shadow: 0 0 18px rgba(0, 82, 255, 0.45);
        }

        /* ====== FAQ Section ====== */
        .faq-section {
            padding: 2.5rem 0 3.5rem;
            position: relative;
            z-index: 1;
        }

        .faq-section .accordion-item {
            background: rgba(13, 17, 30, 0.75);
            border: 1px solid rgba(0, 240, 255, 0.16);
            border-radius: var(--radius-md) !important;
            margin-bottom: 0.8rem;
            overflow: hidden;
            transition: var(--transition);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }

        .faq-section .accordion-item:hover {
            border-color: rgba(0, 240, 255, 0.35);
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.1);
        }

        .faq-section .accordion-button {
            background: transparent;
            color: var(--text-white);
            font-weight: 600;
            font-size: 0.98rem;
            padding: 1.1rem 1.3rem;
            border: none;
            box-shadow: none;
            letter-spacing: 0.01em;
        }

        .faq-section .accordion-button:not(.collapsed) {
            background: rgba(0, 82, 255, 0.15);
            color: var(--cyan-neon);
            box-shadow: none;
        }

        .faq-section .accordion-button::after {
            filter: brightness(0) invert(1) sepia(1) saturate(5000%) hue-rotate(160deg);
        }

        .faq-section .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.3);
            border-radius: 0;
        }

        .faq-section .accordion-body {
            color: var(--text-silver);
            font-size: 0.95rem;
            line-height: 1.7;
            padding: 1rem 1.3rem 1.3rem;
            background: rgba(8, 9, 15, 0.5);
        }

        /* ====== Footer ====== */
        .site-footer {
            background: rgba(8, 9, 15, 0.95);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-top: 1px solid rgba(0, 240, 255, 0.15);
            padding: 3.5rem 0 1.5rem;
            position: relative;
            z-index: 1;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }

        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
            margin-top: 1rem;
            max-width: 350px;
        }

        .footer-brand .nav-brand-text {
            font-size: 1.05rem;
            color: var(--text-white);
            font-weight: 700;
            line-height: 1.35;
        }

        .footer-brand .nav-brand-text span {
            color: var(--cyan-neon);
        }

        .footer-col h5 {
            color: var(--text-white);
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 1rem;
            letter-spacing: 0.01em;
            text-transform: uppercase;
            font-size: 0.82rem;
            color: var(--cyan-neon);
            letter-spacing: 0.04em;
        }

        .footer-col ul {
            padding: 0;
            margin: 0;
        }

        .footer-col ul li {
            margin-bottom: 0.6rem;
            list-style: none;
        }

        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 0.9rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
        }

        .footer-col ul li a:hover {
            color: var(--cyan-neon);
            text-shadow: 0 0 8px rgba(0, 240, 255, 0.5);
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(0, 240, 255, 0.12);
        }

        .footer-bottom p {
            color: var(--text-muted);
            font-size: 0.85rem;
            margin-bottom: 0;
        }

        .footer-badges {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.7rem;
        }

        .badge-item {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            background: rgba(0, 82, 255, 0.15);
            border: 1px solid rgba(0, 240, 255, 0.25);
            color: var(--text-silver);
            font-size: 0.75rem;
            padding: 0.35rem 0.75rem;
            border-radius: 20px;
            letter-spacing: 0.02em;
        }

        .badge-item i {
            color: var(--cyan-neon);
            font-size: 0.7rem;
        }

        /* ====== FAB ====== */
        .fab-cyber {
            position: fixed;
            left: 1.1rem;
            bottom: 6rem;
            z-index: 1080;
            display: inline-flex;
            align-items: center;
            gap: 0.55rem;
            background: rgba(8, 9, 15, 0.72);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1.5px solid transparent;
            background-image: linear-gradient(rgba(8, 9, 15, 0.72), rgba(8, 9, 15, 0.72)), linear-gradient(135deg, var(--cyan-neon), var(--blue-electric));
            background-origin: border-box;
            background-clip: padding-box, border-box;
            border-radius: 50px;
            padding: 0.65rem 1.15rem;
            color: var(--cyan-neon);
            font-size: 0.88rem;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.45), 0 0 42px rgba(0, 82, 255, 0.2);
            opacity: 0.68;
            text-decoration: none;
            min-height: 50px;
            min-width: 50px;
            align-items: center;
            justify-content: center;
        }

        .fab-cyber i {
            font-size: 1.15rem;
            color: #fff;
            text-shadow: 0 0 10px rgba(0, 240, 255, 0.8);
            transition: var(--transition);
        }

        .fab-cyber:hover {
            opacity: 1;
            color: #fff;
            box-shadow: 0 0 32px rgba(0, 240, 255, 0.7), 0 0 62px rgba(0, 82, 255, 0.4);
            transform: scale(1.06);
        }

        .fab-cyber:hover i {
            transform: rotate(360deg);
            color: var(--cyan-neon);
        }

        .fab-cyber:active {
            transform: scale(0.94);
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.4);
        }

        .fab-notification {
            position: absolute;
            top: 0.2rem;
            right: 0.2rem;
            width: 12px;
            height: 12px;
            background: #ff2d55;
            border-radius: 50%;
            border: 2px solid #08090F;
            animation: fabBlink 1.8s ease-in-out infinite;
        }

        @keyframes fabBlink {
            0%,
            100% {
                opacity: 1;
                box-shadow: 0 0 6px rgba(255, 45, 85, 0.8);
            }
            50% {
                opacity: 0.4;
                box-shadow: 0 0 2px rgba(255, 45, 85, 0.3);
            }
        }

        .fab-label {
            font-size: 0.82rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            white-space: nowrap;
            color: #fff;
        }

        /* ====== Responsive ====== */
        @media (max-width: 1199.98px) {
            .footer-grid {
                grid-template-columns: 1.3fr 1fr 1fr 1.1fr;
                gap: 2rem;
            }
        }

        @media (max-width: 1024px) {
            .article-body-card {
                padding: 2rem;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr 1fr;
                gap: 2rem;
            }

            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 991.98px) {
            .site-nav {
                flex-wrap: wrap;
                gap: 0.75rem;
                min-height: auto;
                padding: 0.7rem 0;
            }

            .nav-menu {
                gap: 0.2rem;
            }

            .nav-link {
                padding: 0.45rem 0.7rem;
                font-size: 0.82rem;
            }

            .nav-actions {
                gap: 0.45rem;
            }

            .btn-login,
            .btn-signup {
                padding: 0.45rem 0.9rem;
                font-size: 0.8rem;
            }

            .article-hero {
                padding-top: 150px;
            }

            .article-body-card {
                padding: 1.75rem;
            }

            .article-content {
                font-size: 1rem;
            }
        }

        @media (max-width: 768px) {
            .site-nav {
                justify-content: space-between;
                flex-wrap: nowrap;
            }

            .nav-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.97);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                align-items: stretch;
                padding: 1rem 1.25rem 1.3rem;
                gap: 0.3rem;
                border-bottom: 1px solid rgba(0, 240, 255, 0.2);
                box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
                z-index: 1070;
            }

            .nav-menu.open {
                display: flex;
            }

            .nav-link {
                padding: 0.6rem 0.85rem;
                font-size: 0.92rem;
                border-radius: var(--radius-sm);
                width: 100%;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .nav-actions {
                gap: 0.4rem;
            }

            .btn-login {
                display: inline-block;
                padding: 0.4rem 0.7rem;
                font-size: 0.75rem;
            }

            .btn-signup {
                display: inline-block;
                padding: 0.45rem 0.8rem;
                font-size: 0.78rem;
            }

            .article-hero {
                padding-top: 140px;
                padding-bottom: 2rem;
            }

            .article-title-block h1 {
                font-size: 1.65rem;
            }

            .article-body-card {
                padding: 1.4rem;
                border-radius: var(--radius-md);
            }

            .article-content {
                font-size: 0.97rem;
                line-height: 1.7;
            }

            .article-content h2 {
                font-size: 1.3rem;
            }

            .article-content h3 {
                font-size: 1.15rem;
            }

            .article-breadcrumb .breadcrumb {
                font-size: 0.75rem;
                padding: 0.45rem 0.75rem;
            }

            .section-header h2 {
                font-size: 1.3rem;
            }

            .cta-box {
                padding: 2rem 1.3rem;
                border-radius: var(--radius-lg);
            }

            .cta-box h2 {
                font-size: 1.35rem;
            }

            .cta-box p {
                font-size: 0.92rem;
            }

            .btn-glow {
                padding: 0.7rem 1.5rem;
                font-size: 0.92rem;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1.8rem;
            }

            .footer-brand {
                grid-column: 1 / -1;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 0.8rem;
            }

            .footer-badges {
                justify-content: center;
            }

            .fab-cyber {
                left: 0.8rem;
                bottom: 4.5rem;
                padding: 0.55rem 0.85rem;
                min-height: 44px;
                min-width: 44px;
            }

            .fab-label {
                font-size: 0.72rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }

            .nav-brand-text {
                font-size: 0.98rem;
            }

            .nav-brand-icon {
                width: 38px;
                height: 38px;
                font-size: 1.05rem;
            }

            .btn-login,
            .btn-signup {
                padding: 0.35rem 0.6rem;
                font-size: 0.72rem;
            }

            .article-hero {
                padding-top: 130px;
                padding-bottom: 1.5rem;
            }

            .article-title-block h1 {
                font-size: 1.4rem;
            }

            .article-meta-row {
                font-size: 0.75rem;
                gap: 0.7rem;
            }

            .article-body-card {
                padding: 1.1rem;
                border-radius: var(--radius-sm);
            }

            .article-content {
                font-size: 0.93rem;
            }

            .article-content h2 {
                font-size: 1.15rem;
                padding-left: 0.7rem;
            }

            .article-content h3 {
                font-size: 1.05rem;
            }

            .article-content blockquote {
                padding: 0.9rem 1rem;
                font-size: 0.9rem;
            }

            .article-content table th,
            .article-content table td {
                padding: 0.6rem 0.7rem;
                font-size: 0.85rem;
            }

            .related-section {
                padding: 1.8rem 0 2.2rem;
            }

            .related-card-img {
                height: 160px;
            }

            .related-card-body {
                padding: 0.95rem 1rem 1.1rem;
            }

            .related-card-body h3 {
                font-size: 0.92rem;
            }

            .section-header h2 {
                font-size: 1.18rem;
            }

            .cta-section {
                padding: 2.2rem 0 2.8rem;
            }

            .cta-box {
                padding: 1.6rem 1rem;
            }

            .cta-box h2 {
                font-size: 1.2rem;
            }

            .btn-glow {
                padding: 0.6rem 1.3rem;
                font-size: 0.85rem;
            }

            .faq-section {
                padding: 1.8rem 0 2.5rem;
            }

            .faq-section .accordion-button {
                font-size: 0.88rem;
                padding: 0.95rem 1rem;
            }

            .faq-section .accordion-body {
                font-size: 0.87rem;
                padding: 0.85rem 1rem 1.1rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }

            .footer-brand {
                grid-column: auto;
            }

            .footer-col h5 {
                font-size: 0.78rem;
            }

            .footer-col ul li a {
                font-size: 0.85rem;
            }

            .footer-bottom p {
                font-size: 0.78rem;
            }

            .badge-item {
                font-size: 0.68rem;
                padding: 0.28rem 0.6rem;
            }

            .fab-cyber {
                left: 0.7rem;
                bottom: 3.8rem;
                padding: 0.5rem 0.7rem;
            }

            .fab-cyber .fab-label {
                display: none;
            }
        }

/* roulang page: category3 */
:root {
            --bg-deep: #0A0F1A;
            --bg-card: rgba(18, 25, 45, 0.7);
            --glass-border: rgba(0, 82, 255, 0.25);
            --accent-cyan: #00F0FF;
            --accent-blue: #0052FF;
            --accent-glow: rgba(0, 82, 255, 0.5);
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #8892B0;
            --btn-gradient: linear-gradient(135deg, #0052FF, #00F0FF);
            --shadow-glow: 0 0 15px rgba(0, 82, 255, 0.4);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
            --border-radius-lg: 1.25rem;
            --border-radius-md: 0.75rem;
            --border-radius-sm: 0.5rem;
            --font-heading: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: var(--font-heading);
            background: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            background-image: radial-gradient(circle at 20% 10%, rgba(0, 82, 255, 0.08), transparent 50%),
                              radial-gradient(circle at 80% 90%, rgba(0, 240, 255, 0.05), transparent 60%);
        }

        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #66F0FF;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .container {
            max-width: 1200px;
        }

        /* ---------- HEADER ---------- */
        .site-header {
            background: rgba(8, 10, 20, 0.85);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0, 82, 255, 0.3);
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
        }
        .site-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.75rem 0;
        }
        .nav-brand {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--text-primary);
            text-decoration: none;
            white-space: nowrap;
        }
        .nav-brand:hover {
            color: var(--accent-cyan);
        }
        .nav-brand-icon {
            font-size: 1.6rem;
            color: var(--accent-cyan);
            text-shadow: 0 0 8px rgba(0,240,255,0.5);
        }
        .nav-brand-text span {
            color: var(--accent-cyan);
        }
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 0.25rem;
            margin: 0;
            padding: 0;
        }
        .nav-link {
            display: flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius-md);
            color: var(--text-secondary);
            font-weight: 500;
            transition: all 0.2s ease;
            white-space: nowrap;
        }
        .nav-link:hover {
            background: rgba(0, 82, 255, 0.2);
            color: var(--text-primary);
        }
        .nav-link.active {
            background: rgba(0, 82, 255, 0.35);
            color: var(--accent-cyan);
            box-shadow: 0 0 8px rgba(0, 240, 255, 0.3);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .btn-login {
            background: transparent;
            border: 1px solid rgba(255,255,255,0.3);
            color: var(--text-primary);
            padding: 0.5rem 1.25rem;
            border-radius: 2rem;
            font-weight: 500;
            transition: all 0.2s ease;
            cursor: pointer;
        }
        .btn-login:hover {
            border-color: var(--accent-cyan);
            background: rgba(0,240,255,0.1);
        }
        .btn-signup {
            background: var(--btn-gradient);
            border: none;
            color: #000;
            font-weight: 700;
            padding: 0.5rem 1.5rem;
            border-radius: 2rem;
            cursor: pointer;
            box-shadow: var(--shadow-glow);
            transition: all 0.25s ease;
        }
        .btn-signup:hover {
            transform: translateY(-1px);
            box-shadow: 0 0 20px rgba(0,240,255,0.7);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.5rem;
            cursor: pointer;
        }

        @media (max-width: 992px) {
            .nav-menu {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background: rgba(5, 8, 18, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 1rem;
                gap: 0.5rem;
                display: none;
                z-index: 1040;
                border-bottom: 1px solid var(--glass-border);
            }
            .nav-menu.show {
                display: flex;
            }
            .nav-toggle {
                display: block;
            }
            .nav-actions .btn-login,
            .nav-actions .btn-signup {
                padding: 0.4rem 1rem;
                font-size: 0.85rem;
            }
        }

        /* ---------- HERO ---------- */
        .hero-section {
            position: relative;
            padding: 5rem 0 4rem;
            background: linear-gradient(135deg, #050A18 0%, #0D1528 50%, #050A18 100%);
            overflow: hidden;
        }
        .hero-section::before {
            content: "";
            position: absolute;
            top: -40%;
            right: -15%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0,82,255,0.18), transparent 65%);
            border-radius: 50%;
            z-index: 0;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 2.5rem;
        }
        .hero-text {
            flex: 1;
        }
        .hero-text h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1rem;
            color: var(--text-primary);
        }
        .hero-text h1 span {
            background: linear-gradient(135deg, #00F0FF, #0066FF);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-text .lead {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 2rem;
            max-width: 550px;
        }
        .hero-visual {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .hero-visual img {
            max-height: 350px;
            border-radius: var(--border-radius-lg);
            box-shadow: 0 0 35px rgba(0,82,255,0.35);
            border: 1px solid var(--glass-border);
        }
        .hero-badges {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        .badge-glass {
            background: rgba(0,82,255,0.15);
            border: 1px solid rgba(0,240,255,0.3);
            color: var(--accent-cyan);
            padding: 0.35rem 1rem;
            border-radius: 2rem;
            font-size: 0.85rem;
            font-weight: 500;
            backdrop-filter: blur(4px);
        }
        .btn-cta-hero {
            background: var(--btn-gradient);
            border: none;
            color: #000;
            font-weight: 700;
            padding: 0.8rem 2.2rem;
            border-radius: 2.5rem;
            font-size: 1.1rem;
            cursor: pointer;
            box-shadow: var(--shadow-glow);
            transition: 0.25s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .btn-cta-hero:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 25px rgba(0,240,255,0.8);
        }
        @media (max-width: 768px) {
            .hero-content {
                flex-direction: column;
                text-align: center;
            }
            .hero-text h1 {
                font-size: 2rem;
            }
            .hero-badges {
                justify-content: center;
            }
        }

        /* ---------- CARDS / SECTIONS ---------- */
        .section-title {
            font-weight: 700;
            font-size: 2rem;
            margin-bottom: 0.5rem;
        }
        .section-divider {
            width: 60px;
            height: 3px;
            background: var(--btn-gradient);
            margin-bottom: 2rem;
            border-radius: 2px;
        }
        .card-glass {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--glass-border);
            border-radius: var(--border-radius-lg);
            padding: 1.75rem;
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
            height: 100%;
        }
        .card-glass:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 25px rgba(0,240,255,0.25);
            transform: translateY(-3px);
        }
        .promo-icon {
            font-size: 2.2rem;
            color: var(--accent-cyan);
            text-shadow: 0 0 10px rgba(0,240,255,0.5);
            margin-bottom: 1rem;
        }
        .promo-tag {
            background: rgba(255, 215, 0, 0.15);
            color: #FFD700;
            font-weight: 700;
            font-size: 0.75rem;
            padding: 0.2rem 0.7rem;
            border-radius: 1rem;
            display: inline-block;
            margin-bottom: 0.75rem;
            border: 1px solid rgba(255,215,0,0.4);
        }
        .text-gold {
            color: #FFD700;
            font-weight: 700;
        }
        .list-check {
            list-style: none;
            padding-left: 0;
        }
        .list-check li {
            padding: 0.4rem 0;
            display: flex;
            align-items: flex-start;
            gap: 0.6rem;
            color: var(--text-secondary);
        }
        .list-check i {
            color: var(--accent-cyan);
            margin-top: 0.2rem;
        }
        .btn-outline-glow {
            border: 1px solid var(--accent-cyan);
            background: transparent;
            color: var(--accent-cyan);
            padding: 0.55rem 1.8rem;
            border-radius: 2rem;
            font-weight: 600;
            transition: all 0.25s;
            box-shadow: 0 0 8px rgba(0,240,255,0.2);
        }
        .btn-outline-glow:hover {
            background: rgba(0,240,255,0.1);
            box-shadow: 0 0 20px rgba(0,240,255,0.5);
            color: #fff;
        }

        /* ---------- FOOTER ---------- */
        .site-footer {
            background: #060A12;
            border-top: 1px solid rgba(0,82,255,0.25);
            padding: 3rem 0 1.5rem;
            color: var(--text-secondary);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-brand .nav-brand-text {
            font-size: 1.15rem;
            color: var(--text-primary);
        }
        .footer-col h5 {
            color: var(--accent-cyan);
            font-weight: 600;
            margin-bottom: 0.75rem;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
        }
        .footer-col li {
            margin-bottom: 0.4rem;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 0.85rem;
        }
        .footer-badges {
            display: flex;
            gap: 1.2rem;
        }
        .badge-item {
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 0.8rem;
                text-align: center;
            }
        }

        /* FAB Left */
        .fab-left {
            position: fixed;
            left: 1.2rem;
            bottom: 6rem;
            z-index: 1000;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: rgba(10,15,30,0.75);
            backdrop-filter: blur(10px);
            border: 1.5px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #00F0FF;
            font-size: 1.6rem;
            box-shadow: 0 0 14px rgba(0,240,255,0.45);
            transition: 0.25s;
            cursor: pointer;
            animation: floatFab 3s infinite ease-in-out;
        }
        .fab-left::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50%;
            padding: 2px;
            background: linear-gradient(135deg, #00F0FF, #0052FF);
            mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            z-index: -1;
        }
        .fab-left:hover {
            transform: scale(1.12);
            box-shadow: 0 0 24px rgba(0,240,255,0.7);
        }
        @keyframes floatFab {
            0%,100% { transform: translateY(0); }
            50% { transform: translateY(-5px); }
        }

        .section-spacing {
            padding: 3.5rem 0;
        }

/* roulang page: category2 */
:root {
            --bg-primary: #0D111E;
            --bg-secondary: #131A2B;
            --bg-card: rgba(19, 26, 43, 0.7);
            --accent-primary: #0052FF;
            --accent-secondary: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #8B9AB5;
            --border-color: rgba(0, 240, 255, 0.15);
            --glow-blue: 0 0 20px rgba(0, 82, 255, 0.4);
            --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.5);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
            background-image: 
                radial-gradient(ellipse at 20% 20%, rgba(0, 82, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 80%, rgba(0, 240, 255, 0.06) 0%, transparent 50%);
        }

        /* Header */
        .site-header {
            background: rgba(13, 17, 30, 0.95);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1050;
            padding: 0;
        }

        .site-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            flex-wrap: wrap;
        }

        .nav-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            color: var(--text-primary);
            font-weight: 700;
            font-size: 1.2rem;
        }

        .nav-brand:hover {
            color: var(--accent-secondary);
        }

        .nav-brand-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: #fff;
            box-shadow: var(--glow-cyan);
        }

        .nav-brand-text span {
            color: var(--accent-secondary);
        }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 8px;
            margin: 0;
            padding: 0;
        }

        .nav-link {
            color: var(--text-secondary);
            text-decoration: none;
            padding: 8px 16px;
            border-radius: 20px;
            font-weight: 500;
            font-size: 0.9rem;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 6px;
            white-space: nowrap;
        }

        .nav-link:hover,
        .nav-link.active {
            color: var(--accent-secondary);
            background: rgba(0, 240, 255, 0.08);
            box-shadow: var(--glow-cyan);
        }

        .nav-link.active {
            background: rgba(0, 240, 255, 0.12);
            font-weight: 600;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .btn-login {
            background: transparent;
            border: 1px solid var(--accent-secondary);
            color: var(--accent-secondary);
            padding: 8px 20px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-login:hover {
            background: rgba(0, 240, 255, 0.1);
            box-shadow: var(--glow-cyan);
            transform: translateY(-1px);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-primary), #0066ff);
            border: none;
            color: #fff;
            padding: 8px 20px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--glow-blue);
            white-space: nowrap;
        }

        .btn-signup:hover {
            background: linear-gradient(135deg, #0066ff, #0080ff);
            box-shadow: 0 0 30px rgba(0, 82, 255, 0.6);
            transform: translateY(-1px);
        }

        .nav-toggle {
            display: none;
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            font-size: 1.3rem;
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: var(--transition);
        }

        .nav-toggle:hover {
            border-color: var(--accent-secondary);
            color: var(--accent-secondary);
        }

        /* Hero Section */
        .page-hero {
            background: 
                linear-gradient(180deg, rgba(13, 17, 30, 0.7) 0%, rgba(13, 17, 30, 0.95) 100%),
                url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            padding: 80px 0 60px;
            position: relative;
            border-bottom: 1px solid var(--border-color);
        }

        .page-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 82, 255, 0.15) 0%, transparent 60%);
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 700px;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(0, 240, 255, 0.15);
            border: 1px solid var(--accent-secondary);
            color: var(--accent-secondary);
            padding: 6px 18px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.85rem;
            margin-bottom: 20px;
            box-shadow: var(--glow-cyan);
        }

        .page-hero h1 {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 20px;
            line-height: 1.3;
            background: linear-gradient(135deg, #ffffff 0%, var(--accent-secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .page-hero .lead {
            font-size: 1.1rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 30px;
        }

        .hero-stats {
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
        }

        .hero-stat {
            border-left: 2px solid var(--accent-secondary);
            padding-left: 15px;
        }

        .hero-stat-number {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--accent-secondary);
            display: block;
        }

        .hero-stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* Glass Card */
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: var(--transition);
        }

        .glass-card:hover {
            border-color: var(--accent-secondary);
            box-shadow: var(--glow-cyan);
            transform: translateY(-3px);
        }

        /* Section Styles */
        .section-padding {
            padding: 70px 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 15px;
        }

        .section-subtitle {
            color: var(--text-secondary);
            font-size: 1.05rem;
            margin-bottom: 40px;
        }

        .section-label {
            display: inline-block;
            color: var(--accent-secondary);
            font-weight: 600;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 10px;
        }

        /* Strategy Cards */
        .strategy-card {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px;
            height: 100%;
            position: relative;
            transition: var(--transition);
            overflow: hidden;
        }

        .strategy-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
        }

        .strategy-card:hover {
            border-color: var(--accent-secondary);
            box-shadow: 0 8px 40px rgba(0, 240, 255, 0.2);
            transform: translateY(-5px);
        }

        .strategy-icon {
            width: 55px;
            height: 55px;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid var(--accent-secondary);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--accent-secondary);
            margin-bottom: 18px;
            box-shadow: var(--glow-cyan);
        }

        .strategy-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .strategy-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 0;
        }

        .strategy-number {
            font-size: 3rem;
            font-weight: 800;
            color: rgba(0, 240, 255, 0.1);
            position: absolute;
            right: 20px;
            bottom: 10px;
            line-height: 1;
        }

        /* Scenario Block */
        .scenario-block {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px;
            margin-bottom: 20px;
            position: relative;
            transition: var(--transition);
        }

        .scenario-block:hover {
            border-color: var(--accent-primary);
            box-shadow: 0 4px 28px rgba(0, 82, 255, 0.25);
        }

        .scenario-tag {
            display: inline-block;
            background: rgba(0, 82, 255, 0.2);
            color: #4da6ff;
            padding: 4px 14px;
            border-radius: 16px;
            font-weight: 600;
            font-size: 0.8rem;
            margin-bottom: 15px;
        }

        .scenario-block h4 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .scenario-block p {
            color: var(--text-secondary);
            margin-bottom: 0;
            line-height: 1.7;
        }

        /* Image with Glow */
        .img-glow {
            border-radius: var(--radius-lg);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.2);
            border: 1px solid var(--border-color);
            width: 100%;
            height: auto;
            transition: var(--transition);
        }

        .img-glow:hover {
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.4);
        }

        /* Button Styles */
        .btn-primary-custom {
            background: linear-gradient(135deg, var(--accent-primary), #0066ff);
            border: none;
            color: #fff;
            padding: 12px 32px;
            border-radius: 28px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--glow-blue);
            text-transform: none;
            display: inline-block;
            text-decoration: none;
        }

        .btn-primary-custom:hover {
            background: linear-gradient(135deg, #0066ff, #0080ff);
            box-shadow: 0 0 35px rgba(0, 82, 255, 0.7);
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-outline-cyan {
            background: transparent;
            border: 1px solid var(--accent-secondary);
            color: var(--accent-secondary);
            padding: 12px 32px;
            border-radius: 28px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            display: inline-block;
        }

        .btn-outline-cyan:hover {
            background: rgba(0, 240, 255, 0.1);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.3);
            transform: translateY(-2px);
            color: var(--accent-secondary);
        }

        /* FAQ Accordion */
        .accordion-custom .accordion-item {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md) !important;
            margin-bottom: 12px;
            overflow: hidden;
        }

        .accordion-custom .accordion-button {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            font-size: 1rem;
            padding: 18px 24px;
            box-shadow: none;
            border: none;
        }

        .accordion-custom .accordion-button:not(.collapsed) {
            color: var(--accent-secondary);
            background: rgba(0, 240, 255, 0.05);
            box-shadow: none;
        }

        .accordion-custom .accordion-button::after {
            filter: invert(0.8);
        }

        .accordion-custom .accordion-body {
            color: var(--text-secondary);
            padding: 20px 24px;
            line-height: 1.8;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.1) 0%, rgba(0, 240, 255, 0.05) 100%);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: 50px 30px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at 50% 50%, rgba(0, 240, 255, 0.1) 0%, transparent 50%);
            animation: rotateGlow 10s linear infinite;
        }

        @keyframes rotateGlow {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .cta-section > * {
            position: relative;
            z-index: 2;
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 15px;
        }

        .cta-section p {
            color: var(--text-secondary);
            font-size: 1.1rem;
            margin-bottom: 30px;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 50px 0 30px;
            margin-top: 70px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }

        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-top: 10px;
            line-height: 1.7;
        }

        .footer-col h5 {
            color: var(--accent-secondary);
            font-weight: 700;
            font-size: 1rem;
            margin-bottom: 15px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 0.9rem;
            transition: var(--transition);
        }

        .footer-col ul li a:hover {
            color: var(--accent-secondary);
            text-decoration: underline;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
        }

        .footer-bottom p {
            color: var(--text-muted);
            font-size: 0.85rem;
            margin: 0;
        }

        .footer-badges {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
        }

        .badge-item {
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid var(--border-color);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* FAB */
        .fab-floating {
            position: fixed;
            left: 20px;
            bottom: 100px;
            z-index: 1060;
            width: 56px;
            height: 56px;
            background: rgba(13, 17, 30, 0.8);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 2px solid transparent;
            background-clip: padding-box;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            font-size: 1.4rem;
            color: var(--accent-secondary);
            box-shadow: var(--glow-cyan);
            animation: floatVertical 3s ease-in-out infinite;
        }

        .fab-floating::before {
            content: '';
            position: absolute;
            inset: -3px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary), #ff00ff);
            z-index: -1;
            animation: rotateBorder 4s linear infinite;
        }

        @keyframes rotateBorder {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        @keyframes floatVertical {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-8px); }
        }

        .fab-floating:hover {
            transform: scale(1.15);
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.8);
            color: #fff;
        }

        .fab-floating .fa-comment-dots {
            filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.8));
        }

        /* Responsive */
        @media (max-width: 992px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .page-hero h1 {
                font-size: 2rem;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background: rgba(13, 17, 30, 0.95);
                backdrop-filter: blur(20px);
                padding: 16px;
                border-radius: var(--radius-md);
                margin-top: 12px;
                border: 1px solid var(--border-color);
            }

            .nav-menu.show {
                display: flex;
            }

            .nav-toggle {
                display: block;
            }

            .nav-actions {
                gap: 6px;
            }

            .btn-login,
            .btn-signup {
                padding: 6px 14px;
                font-size: 0.8rem;
            }

            .page-hero {
                padding: 50px 0 40px;
            }

            .page-hero h1 {
                font-size: 1.7rem;
            }

            .hero-stats {
                gap: 15px;
            }

            .hero-stat-number {
                font-size: 1.4rem;
            }

            .section-padding {
                padding: 40px 0;
            }

            .section-title {
                font-size: 1.6rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .fab-floating {
                left: 12px;
                bottom: 80px;
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
            }
        }

        @media (max-width: 520px) {
            .nav-brand-text {
                font-size: 0.9rem;
            }

            .btn-login,
            .btn-signup {
                padding: 6px 12px;
                font-size: 0.75rem;
            }

            .page-hero h1 {
                font-size: 1.4rem;
            }

            .strategy-card {
                padding: 20px;
            }

            .cta-section {
                padding: 30px 15px;
            }

            .cta-section h2 {
                font-size: 1.5rem;
            }
        }