/* roulang page: index */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --card-bg: rgba(13, 17, 30, 0.7);
            --glass-bg: rgba(255, 255, 255, 0.05);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --neon-glow: rgba(0, 240, 255, 0.5);
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --border-dim: rgba(0, 82, 255, 0.15);
            --border-glow: rgba(0, 240, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.4);
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-heading: 'Segoe UI', 'Inter', 'Roboto', sans-serif;
            --font-body: 'Segoe UI', 'Inter', 'Roboto', system-ui, sans-serif;
            --max-width: 1200px;
            --nav-height: 72px;
        }

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

        body {
            font-family: var(--font-body);
            background: var(--primary-bg);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        /* Custom Container */
        .container-custom {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-dim);
            z-index: 1000;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

        .logo {
            font-family: var(--font-heading);
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-primary);
            text-decoration: none;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: var(--transition-fast);
        }

        .logo:hover {
            opacity: 0.85;
        }

        .nav-menu {
            list-style: none;
            display: flex;
            align-items: center;
            gap: 28px;
            margin: 0;
        }

        .nav-menu li a {
            font-family: var(--font-body);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            text-decoration: none;
            padding: 6px 0;
            position: relative;
            transition: color var(--transition-fast);
        }

        .nav-menu li a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width var(--transition-smooth);
        }

        .nav-menu li a:hover,
        .nav-menu li a.active {
            color: var(--text-primary);
        }

        .nav-menu li a:hover::after,
        .nav-menu li a.active::after {
            width: 100%;
        }

        .nav-cta-group {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            background: transparent;
            border: none;
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 8px 18px;
            cursor: pointer;
            transition: color var(--transition-fast);
        }

        .btn-login:hover {
            color: var(--text-primary);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border: none;
            color: #FFFFFF;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 24px;
            border-radius: 50px;
            cursor: pointer;
            box-shadow: 0 0 18px var(--neon-glow);
            transition: all var(--transition-smooth);
            letter-spacing: 0.3px;
        }

        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.8);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.6rem;
            cursor: pointer;
        }

        /* Responsive Nav */
        @media (max-width: 840px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                width: 100%;
                background: rgba(8, 9, 15, 0.98);
                backdrop-filter: blur(30px);
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-dim);
                z-index: 999;
            }

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

            .nav-cta-group {
                display: flex;
            }

            .mobile-toggle {
                display: block;
            }
        }

        /* Hero Section - 左文右图斜向错位 */
        .hero-section {
            min-height: 100vh;
            background: linear-gradient(135deg, #08090F 0%, #0D111E 100%);
            position: relative;
            overflow: hidden;
            display: flex;
            align-items: center;
            padding-top: var(--nav-height);
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -20%;
            right: -10%;
            width: 700px;
            height: 700px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            z-index: 0;
        }

        .hero-inner {
            display: grid;
            grid-template-columns: 5fr 7fr;
            gap: 40px;
            align-items: center;
            position: relative;
            z-index: 2;
        }

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

        .hero-badge {
            display: inline-block;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            color: var(--accent-cyan);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 50px;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }

        .hero-title {
            font-family: var(--font-heading);
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--text-primary);
            margin-bottom: 20px;
        }

        .hero-title span {
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 32px;
            max-width: 480px;
            line-height: 1.7;
        }

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

        .btn-primary {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #FFFFFF;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: 50px;
            text-decoration: none;
            border: none;
            box-shadow: 0 0 22px var(--neon-glow);
            transition: all var(--transition-smooth);
            display: inline-block;
            cursor: pointer;
            font-size: 1rem;
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.9);
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--accent-cyan);
            color: var(--accent-cyan);
            font-weight: 700;
            padding: 14px 32px;
            border-radius: 50px;
            text-decoration: none;
            transition: all var(--transition-smooth);
            cursor: pointer;
            font-size: 1rem;
        }

        .btn-outline:hover {
            background: rgba(0, 240, 255, 0.08);
        }

        .hero-image-wrapper {
            position: relative;
            transform: rotate(-1deg) translateY(-10px);
        }

        .hero-image {
            width: 100%;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-glass), 0 0 40px rgba(0, 240, 255, 0.2);
            border: 1px solid var(--border-glow);
        }

        @media (max-width: 1024px) {
            .hero-title {
                font-size: 2.4rem;
            }
            .hero-inner {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            .hero-inner {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-text {
                text-align: center;
            }
            .hero-desc {
                max-width: 100%;
                margin: 0 auto 24px;
            }
            .hero-cta-group {
                justify-content: center;
            }
            .hero-image-wrapper {
                transform: none;
                margin-top: 24px;
            }
        }

        /* Section Base */
        .section-padding {
            padding: 80px 0;
        }

        .section-bg-alt {
            background: var(--secondary-bg);
        }

        .section-title {
            font-family: var(--font-heading);
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            margin-bottom: 40px;
            max-width: 600px;
        }

        /* Glass Card Style */
        .glass-card {
            background: var(--glass-bg);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            padding: 28px;
            backdrop-filter: blur(10px);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            transition: var(--transition-smooth);
        }

        .glass-card:hover {
            border-color: var(--border-glow);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.15);
        }

        /* Matrix / Course Grid */
        .offer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 28px;
        }

        .offer-card .icon-circle {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            font-size: 1.4rem;
            color: #fff;
        }

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

        /* Price Comparison Table */
        .comparison-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            margin-top: 24px;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--card-bg);
            border: 1px solid var(--border-dim);
        }

        .comparison-table th {
            background: rgba(0, 240, 255, 0.1);
            padding: 16px;
            font-weight: 700;
            color: var(--accent-cyan);
        }

        .comparison-table td {
            padding: 14px;
            border-top: 1px solid var(--border-dim);
            color: var(--text-secondary);
        }

        .highlight-col {
            background: rgba(0, 82, 255, 0.15);
            color: #fff !important;
            font-weight: 600;
        }

        /* Testimonials Wall */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .testimonial-card {
            background: var(--glass-bg);
            border-radius: var(--radius-md);
            padding: 24px;
            border: 1px solid var(--border-dim);
        }

        .stars {
            color: #FFD700;
            margin-bottom: 10px;
        }

        /* Fest Campaign */
        .campaign-box {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.2), rgba(0, 240, 255, 0.05));
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 40px;
            text-align: left;
        }

        /* Sticky Bottom Bar */
        .sticky-bottom-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(20px);
            border-top: 1px solid var(--border-dim);
            padding: 12px 20px;
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 20px;
            z-index: 999;
        }

        /* Left FAB */
        .floating-fab-left {
            position: fixed;
            left: 20px;
            bottom: 100px;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(13, 17, 30, 0.8);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            box-shadow: 0 0 18px var(--neon-glow);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 998;
            cursor: pointer;
            transition: all var(--transition-smooth);
            border-image: linear-gradient(135deg, #CCFF00, #00F0FF) 1;
        }

        .floating-fab-left:hover {
            transform: scale(1.1);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.9);
        }

        .fab-icon {
            font-size: 1.6rem;
            color: var(--accent-cyan);
        }

        /* Footer */
        .site-footer {
            background: #06070A;
            padding: 60px 0 30px;
            border-top: 1px solid var(--border-dim);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
        }

        .footer-col h4 {
            font-weight: 700;
            margin-bottom: 16px;
        }

        .footer-col a {
            color: var(--text-secondary);
            text-decoration: none;
            display: block;
            margin-bottom: 8px;
            transition: color var(--transition-fast);
        }

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

        .copyright {
            border-top: 1px solid var(--border-dim);
            margin-top: 40px;
            padding-top: 20px;
            text-align: center;
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Additional utility */
        .text-left { text-align: left; }
        .mt-20 { margin-top: 20px; }

/* roulang page: article */
:root {
            --bg-primary: #0A0E17;
            --bg-secondary: #111827;
            --bg-card: rgba(15, 23, 42, 0.7);
            --accent-blue: #0066FF;
            --accent-cyan: #00E5FF;
            --accent-purple: #7C3AED;
            --gradient-btn: linear-gradient(135deg, #0066FF, #7C3AED);
            --text-primary: #F1F5F9;
            --text-secondary: #94A3B8;
            --text-muted: #64748B;
            --border-color: rgba(0, 102, 255, 0.2);
            --border-glow: rgba(0, 229, 255, 0.4);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 102, 255, 0.3);
            --radius-lg: 18px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --glass-bg: rgba(17, 24, 39, 0.6);
            --glass-border: rgba(255, 255, 255, 0.08);
            --backdrop-blur: blur(16px);
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(160deg, var(--bg-primary) 0%, #0F172A 50%, var(--bg-secondary) 100%);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(ellipse at 20% 20%, rgba(0, 102, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 60%, rgba(124, 58, 237, 0.06) 0%, transparent 50%);
            pointer-events: none;
            z-index: 0;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(10, 14, 23, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }

        .container-custom {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 0;
            gap: 24px;
        }

        .logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            text-decoration: none;
            letter-spacing: -0.5px;
            white-space: nowrap;
            background: linear-gradient(135deg, #FFFFFF, #00E5FF);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: var(--transition-base);
        }

        .logo:hover {
            filter: brightness(1.2);
        }

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

        .nav-menu a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 10px 18px;
            border-radius: var(--radius-sm);
            transition: var(--transition-base);
            position: relative;
            white-space: nowrap;
        }

        .nav-menu a:hover,
        .nav-menu a.active {
            color: #FFFFFF;
            background: rgba(0, 102, 255, 0.15);
        }

        .nav-menu a.active {
            background: rgba(0, 102, 255, 0.25);
            box-shadow: 0 0 12px rgba(0, 102, 255, 0.2);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            color: var(--text-primary);
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition-base);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        .btn-signup {
            background: var(--gradient-btn);
            color: #FFFFFF;
            border: none;
            padding: 11px 26px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition-base);
            box-shadow: 0 4px 16px rgba(0, 102, 255, 0.4);
            white-space: nowrap;
        }

        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0, 102, 255, 0.6);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.6rem;
            cursor: pointer;
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(10, 14, 23, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px;
                border-bottom: 1px solid var(--border-color);
            }

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

            .mobile-toggle {
                display: block;
            }

            .header-actions {
                gap: 8px;
            }

            .btn-login,
            .btn-signup {
                padding: 8px 16px;
                font-size: 0.85rem;
            }
        }

        /* Article Main */
        .article-page {
            position: relative;
            z-index: 1;
            padding: 60px 0 80px;
        }

        .article-container {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .article-breadcrumb {
            display: flex;
            gap: 8px;
            align-items: center;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 32px;
            flex-wrap: wrap;
        }

        .article-breadcrumb a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: var(--transition-base);
        }

        .article-breadcrumb a:hover {
            text-decoration: underline;
        }

        .article-breadcrumb i {
            font-size: 0.65rem;
            color: var(--text-muted);
        }

        .article-header-block {
            background: var(--glass-bg);
            backdrop-filter: var(--backdrop-blur);
            -webkit-backdrop-filter: var(--backdrop-blur);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 48px;
            margin-bottom: 40px;
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }

        .article-header-block::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--gradient-btn);
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        }

        .article-header-block h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 16px;
            color: #FFFFFF;
            letter-spacing: -0.5px;
        }

        .article-meta {
            display: flex;
            gap: 24px;
            font-size: 0.9rem;
            color: var(--text-muted);
            flex-wrap: wrap;
            align-items: center;
        }

        .article-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta i {
            color: var(--accent-cyan);
        }

        .article-category-tag {
            background: rgba(0, 102, 255, 0.15);
            color: var(--accent-cyan);
            padding: 6px 16px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.85rem;
        }

        .article-content-wrapper {
            background: var(--glass-bg);
            backdrop-filter: var(--backdrop-blur);
            -webkit-backdrop-filter: var(--backdrop-blur);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 48px;
            box-shadow: var(--shadow-card);
        }

        .article-content {
            font-size: 1.05rem;
            line-height: 1.75;
            color: #E2E8F0;
        }

        .article-content h2 {
            font-size: 1.7rem;
            font-weight: 700;
            margin: 36px 0 16px;
            color: #FFFFFF;
            border-left: 4px solid var(--accent-blue);
            padding-left: 16px;
        }

        .article-content h3 {
            font-size: 1.35rem;
            font-weight: 600;
            margin: 28px 0 12px;
            color: #F1F5F9;
        }

        .article-content p {
            margin-bottom: 16px;
        }

        .article-content img {
            max-width: 100%;
            border-radius: var(--radius-md);
            margin: 24px 0;
            box-shadow: var(--shadow-card);
        }

        .article-content ul,
        .article-content ol {
            margin: 16px 0 24px;
            padding-left: 24px;
        }

        .article-content li {
            margin-bottom: 8px;
            color: #CBD5E1;
        }

        .article-cta-banner {
            background: linear-gradient(135deg, rgba(0, 102, 255, 0.2), rgba(124, 58, 237, 0.2));
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 32px;
            text-align: center;
            margin: 40px 0;
            box-shadow: var(--shadow-glow);
        }

        .article-cta-banner h3 {
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: #FFFFFF;
        }

        .article-cta-banner p {
            color: var(--text-secondary);
            margin-bottom: 20px;
        }

        .btn-cta-primary {
            display: inline-block;
            background: var(--gradient-btn);
            color: #FFFFFF;
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 1rem;
            text-decoration: none;
            transition: var(--transition-base);
            box-shadow: 0 6px 24px rgba(0, 102, 255, 0.5);
        }

        .btn-cta-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 32px rgba(0, 102, 255, 0.7);
            color: #FFFFFF;
        }

        .not-found-message {
            text-align: center;
            padding: 80px 24px;
        }

        .not-found-message h2 {
            font-size: 1.8rem;
            margin-bottom: 16px;
        }

        .not-found-message a {
            color: var(--accent-cyan);
            font-weight: 600;
            text-decoration: none;
        }

        @media (max-width: 768px) {
            .article-header-block {
                padding: 28px 20px;
            }

            .article-header-block h1 {
                font-size: 1.8rem;
            }

            .article-content-wrapper {
                padding: 24px 16px;
            }

            .article-content h2 {
                font-size: 1.4rem;
            }
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
            position: relative;
            z-index: 1;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: #FFFFFF;
        }

        .footer-col a {
            display: block;
            color: var(--text-secondary);
            text-decoration: none;
            margin-bottom: 8px;
            transition: var(--transition-base);
        }

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

        .copyright {
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 20px;
            bottom: 100px;
            z-index: 999;
            width: 56px;
            height: 56px;
            border-radius: 50px;
            background: rgba(10, 14, 23, 0.8);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition-base);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
            animation: float 3s ease-in-out infinite;
        }

        .fab-left::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50px;
            background: linear-gradient(135deg, #0066FF, #00E5FF);
            z-index: -1;
            opacity: 0.7;
            animation: glowPulse 2s ease-in-out infinite;
        }

        .fab-left i {
            font-size: 1.6rem;
            color: #FFFFFF;
            transition: var(--transition-base);
        }

        .fab-left:hover {
            transform: scale(1.1);
            box-shadow: 0 0 32px rgba(0, 229, 255, 0.7);
        }

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

        @keyframes glowPulse {
            0%, 100% { opacity: 0.5; }
            50% { opacity: 0.9; }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.65);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --accent-pink: #FF007F;
            --accent-gold: #FFD700;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 240, 255, 0.25);
            --border-card: rgba(0, 240, 255, 0.12);
            --shadow-glow: 0 0 18px rgba(0, 240, 255, 0.18);
            --shadow-elevated: 0 12px 32px rgba(0, 0, 0, 0.55);
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 22px;
            --radius-xl: 30px;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            background: var(--bg-primary);
            color: var(--text-primary);
            font-family: 'Inter', 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            padding-top: 72px;
        }

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

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

        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 60;
            background: rgba(8, 9, 15, 0.82);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.18);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0.7rem 1.5rem;
        }

        .logo {
            font-size: 1.35rem;
            font-weight: 700;
            letter-spacing: -0.3px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 1.8rem;
            list-style: none;
            margin: 0;
        }

        .nav-menu a {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            position: relative;
            padding: 0.3rem 0;
            transition: color 0.2s;
        }

        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--accent-cyan);
        }

        .nav-menu a.active::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -4px;
            width: 100%;
            height: 2px;
            background: var(--accent-cyan);
            box-shadow: 0 0 10px var(--accent-cyan);
            border-radius: 2px;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 0.9rem;
        }

        .btn-login {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid rgba(255, 255, 255, 0.35);
            padding: 0.45rem 1.2rem;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.25s;
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        .btn-signup {
            background: linear-gradient(135deg, #0052FF, #00B8FF);
            color: #fff;
            border: none;
            padding: 0.5rem 1.5rem;
            border-radius: 20px;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            box-shadow: 0 4px 14px rgba(0, 82, 255, 0.45);
            transition: all 0.25s;
        }

        .btn-signup:hover {
            box-shadow: 0 6px 22px rgba(0, 130, 255, 0.6);
            transform: translateY(-1px);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.7rem;
            cursor: pointer;
        }

        /* FAB */
        .fab-support {
            position: fixed;
            left: 1.5rem;
            bottom: 6rem;
            z-index: 55;
            width: 52px;
            height: 52px;
            border-radius: 30px;
            background: rgba(13, 17, 30, 0.7);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(13, 17, 30, 0.7), rgba(13, 17, 30, 0.7)), linear-gradient(135deg, #00F0FF, #0052FF);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.5rem;
            cursor: pointer;
            animation: fab-float 2.8s infinite ease-in-out;
            transition: all 0.25s;
        }

        .fab-support:hover {
            transform: scale(1.08);
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.7);
        }

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

        /* Hero Section */
        .page-hero {
            background: radial-gradient(circle at 30% 40%, rgba(0, 82, 255, 0.18), transparent 60%), var(--bg-secondary);
            padding: 3.5rem 0 2.5rem;
            border-bottom: 1px solid var(--border-glow);
            position: relative;
            overflow: hidden;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -80px;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.08), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(0, 240, 255, 0.12);
            border: 1px solid rgba(0, 240, 255, 0.3);
            color: var(--accent-cyan);
            padding: 0.3rem 1.1rem;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.85rem;
            letter-spacing: 0.3px;
            margin-bottom: 1rem;
        }

        .page-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 1rem;
            background: linear-gradient(to right, #FFFFFF, #CCE8FF);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .page-hero .subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 620px;
            margin-bottom: 1.8rem;
        }

        .btn-cta-glow {
            display: inline-block;
            background: linear-gradient(135deg, #FF007F, #FF3D6F);
            color: #fff;
            font-weight: 700;
            padding: 0.8rem 2.2rem;
            border-radius: 30px;
            font-size: 1rem;
            box-shadow: 0 8px 24px rgba(255, 0, 127, 0.45);
            transition: all 0.25s;
            border: none;
            cursor: pointer;
        }

        .btn-cta-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(255, 0, 127, 0.65);
        }

        /* Offers Grid */
        .offers-section {
            padding: 4rem 0;
        }

        .section-header {
            margin-bottom: 2.5rem;
        }

        .section-header h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.5rem;
        }

        .section-header p {
            color: var(--text-secondary);
        }

        .offers-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.8rem;
        }

        .offer-card {
            background: var(--bg-card);
            backdrop-filter: blur(6px);
            -webkit-backdrop-filter: blur(6px);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-md);
            padding: 1.8rem;
            transition: all 0.3s;
            position: relative;
            overflow: hidden;
        }

        .offer-card::after {
            content: '';
            position: absolute;
            top: -30px;
            right: -30px;
            width: 90px;
            height: 90px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.09), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .offer-card:hover {
            border-color: rgba(0, 240, 255, 0.45);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }

        .offer-icon {
            font-size: 2rem;
            color: var(--accent-cyan);
            margin-bottom: 1rem;
        }

        .offer-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.6rem;
        }

        .offer-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-bottom: 1.2rem;
        }

        .offer-tag {
            display: inline-block;
            background: rgba(255, 0, 127, 0.15);
            color: #FF7AA2;
            font-weight: 600;
            font-size: 0.8rem;
            padding: 0.25rem 0.9rem;
            border-radius: 14px;
            border: 1px solid rgba(255, 0, 127, 0.3);
        }

        /* How It Works */
        .steps-section {
            background: var(--bg-secondary);
            padding: 4rem 0;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }

        .steps-row {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            justify-content: space-between;
            margin-top: 2rem;
        }

        .step-item {
            flex: 1 1 200px;
            text-align: left;
            position: relative;
            padding-left: 1.8rem;
            border-left: 2px solid rgba(0, 240, 255, 0.25);
        }

        .step-num {
            font-size: 2rem;
            font-weight: 800;
            background: linear-gradient(180deg, #00F0FF, #0052FF);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.5rem;
        }

        .step-item h4 {
            font-weight: 700;
            margin-bottom: 0.4rem;
        }

        .step-item p {
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        /* FAQ */
        .faq-section {
            padding: 4rem 0;
        }

        .faq-list {
            max-width: 800px;
            margin-top: 2rem;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-sm);
            margin-bottom: 1rem;
            transition: 0.2s;
        }

        .faq-question {
            padding: 1.1rem 1.5rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #fff;
        }

        .faq-answer {
            padding: 0 1.5rem 1.2rem;
            color: var(--text-secondary);
            display: none;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        .faq-item.open {
            border-color: rgba(0, 240, 255, 0.4);
            box-shadow: var(--shadow-glow);
        }

        /* Footer */
        .site-footer {
            background: #0B0E17;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 3rem 0 1.8rem;
            color: var(--text-secondary);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer-col h4 {
            color: #fff;
            font-weight: 700;
            margin-bottom: 1rem;
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
            transition: 0.2s;
        }

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

        .copyright {
            text-align: center;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 1.5rem;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .page-hero h1 {
                font-size: 2rem;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: rgba(8, 9, 15, 0.96);
                backdrop-filter: blur(16px);
                padding: 1.5rem;
                gap: 1.2rem;
                border-bottom: 1px solid var(--border-glow);
            }

            .nav-menu.active-mobile {
                display: flex;
            }

            .mobile-toggle {
                display: block;
            }

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

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

            .steps-row {
                flex-direction: column;
                gap: 1.5rem;
            }

            .header-actions .btn-login,
            .header-actions .btn-signup {
                padding: 0.4rem 1rem;
                font-size: 0.8rem;
            }
        }

        @media (max-width: 520px) {
            .page-hero {
                padding: 2.5rem 0 2rem;
            }

            .page-hero h1 {
                font-size: 1.5rem;
            }
        }

/* roulang page: category3 */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --card-bg: rgba(13, 17, 30, 0.85);
            --glass-bg: rgba(8, 9, 15, 0.7);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #94A3B8;
            --border-color: rgba(0, 240, 255, 0.2);
            --glow-cyan: 0 0 15px rgba(0, 240, 255, 0.5);
            --glow-blue: 0 0 20px rgba(0, 82, 255, 0.4);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --font-heading: 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
            --font-body: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

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

        body {
            background-color: var(--primary-bg);
            color: var(--text-primary);
            font-family: var(--font-body);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        .container-custom {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }

        header.site-header {
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            flex-wrap: wrap;
        }

        .logo {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.5rem;
            letter-spacing: -0.3px;
            background: linear-gradient(135deg, var(--accent-cyan) 0%, #FFFFFF 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
            white-space: nowrap;
        }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 8px;
            align-items: center;
            flex-wrap: wrap;
        }

        .nav-menu li a {
            display: inline-block;
            padding: 8px 18px;
            border-radius: 8px;
            font-weight: 500;
            font-size: 0.9rem;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all 0.25s ease;
            position: relative;
        }

        .nav-menu li a:hover,
        .nav-menu li a.active {
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.08);
            text-shadow: 0 0 8px rgba(0, 240, 255, 0.4);
        }

        .nav-menu li a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
        }

        .header-actions {
            display: flex;
            gap: 12px;
            align-items: center;
        }

        .btn-login {
            background: transparent;
            border: 1px solid var(--text-secondary);
            color: var(--text-primary);
            padding: 8px 22px;
            border-radius: 24px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s;
        }

        .btn-signup {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            padding: 8px 24px;
            border-radius: 24px;
            font-weight: 600;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.45);
            transition: all 0.3s;
        }

        .btn-signup:hover {
            background: #1a6fff;
            box-shadow: 0 8px 24px rgba(0, 82, 255, 0.6);
        }

        .page-hero {
            background: linear-gradient(135deg, #08090F 0%, #0D111E 100%);
            padding: 60px 0 50px;
            text-align: left;
            position: relative;
            overflow: hidden;
        }

        .page-hero::before {
            content: "";
            position: absolute;
            top: -30%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0,240,255,0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

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

        .hero-content h1 {
            font-size: 2.7rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.25;
            margin-bottom: 18px;
            max-width: 850px;
        }

        .hero-sub {
            font-size: 1.2rem;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .btn-primary-glow {
            background: var(--accent-blue);
            color: #fff;
            font-weight: 600;
            padding: 14px 34px;
            border-radius: 30px;
            border: none;
            cursor: pointer;
            font-size: 1rem;
            box-shadow: 0 6px 24px rgba(0, 82, 255, 0.5);
            transition: all 0.3s;
            display: inline-block;
            text-decoration: none;
        }

        .btn-primary-glow:hover {
            background: #1a6fff;
            box-shadow: 0 12px 32px rgba(0, 82, 255, 0.7);
            transform: translateY(-2px);
        }

        .support-section {
            padding: 70px 0;
            background: var(--secondary-bg);
        }

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

        .problem-card {
            background: var(--card-bg);
            backdrop-filter: blur(14px);
            border: 1px solid rgba(0, 240, 255, 0.15);
            border-radius: var(--radius-md);
            padding: 24px;
            margin-bottom: 20px;
            transition: all 0.25s;
        }

        .problem-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 8px 28px rgba(0, 240, 255, 0.08);
        }

        .problem-card h3 {
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: #fff;
        }

        .problem-card .fix-steps {
            list-style: none;
            margin-top: 12px;
        }

        .fix-steps li {
            position: relative;
            padding-left: 26px;
            margin-bottom: 8px;
            color: var(--text-secondary);
        }

        .fix-steps li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--accent-cyan);
            font-weight: 700;
        }

        .faq-block {
            padding: 70px 0;
            background: var(--primary-bg);
        }

        .faq-item {
            border-bottom: 1px solid rgba(255,255,255,0.1);
            padding: 18px 0;
        }

        .faq-question {
            font-weight: 700;
            font-size: 1.1rem;
            color: #fff;
            cursor: pointer;
        }

        .faq-answer {
            color: var(--text-secondary);
            margin-top: 8px;
        }

        .cta-strip {
            background: linear-gradient(90deg, #0D111E 0%, #0052FF 100%);
            padding: 40px 0;
            text-align: center;
            border-radius: 0;
        }

        .site-footer {
            background: #07090E;
            color: var(--text-secondary);
            padding: 50px 0 25px;
            border-top: 1px solid rgba(255,255,255,0.08);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
        }

        .footer-col h4 {
            color: #fff;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .footer-col a {
            display: block;
            color: var(--text-secondary);
            margin-bottom: 8px;
            text-decoration: none;
        }

        .footer-col a:hover { color: var(--accent-cyan); }
        .copyright { margin-top: 30px; text-align: center; font-size: 0.85rem; color: var(--text-muted); }

        @media (max-width: 768px) {
            .header-inner { flex-direction: column; align-items: flex-start; }
            .nav-menu { margin: 10px 0; }
            .hero-content h1 { font-size: 2rem; }
            .footer-grid { grid-template-columns: 1fr; }
        }

/* roulang page: category2 */
:root {
            --primary-bg: #060912;
            --secondary-bg: #0b1225;
            --card-bg: rgba(18, 25, 50, 0.65);
            --card-border: rgba(0, 82, 255, 0.25);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-accent: #00F0FF;
            --glass-blur: blur(16px);
            --shadow-glow: 0 8px 32px rgba(0, 82, 255, 0.3);
            --shadow-cyan: 0 0 15px rgba(0, 240, 255, 0.5);
            --font-main: 'Inter', 'Segoe UI', Roboto, system-ui, sans-serif;
            --border-radius-card: 1.25rem;
            --border-radius-btn: 2.5rem;
            --transition-base: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
        }

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

        body {
            font-family: var(--font-main);
            background-color: var(--primary-bg);
            background-image: radial-gradient(circle at 20% 10%, rgba(0, 82, 255, 0.15) 0%, transparent 50%),
                              radial-gradient(circle at 80% 60%, rgba(0, 240, 255, 0.08) 0%, transparent 50%);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        .container-custom {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* ---- Header & Navigation ---- */
        .site-header {
            background: rgba(6, 9, 18, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 82, 255, 0.25);
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 0.75rem 0;
            transition: var(--transition-base);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .logo i {
            color: var(--accent-cyan);
            font-size: 1.8rem;
            filter: drop-shadow(0 0 8px var(--accent-cyan));
        }

        .nav-menu {
            display: flex;
            gap: 1.75rem;
            list-style: none;
            margin: 0;
            align-items: center;
        }
        .nav-menu a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            font-size: 1rem;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
            transition: var(--transition-base);
            white-space: nowrap;
        }
        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--accent-cyan);
            border-bottom-color: var(--accent-cyan);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .btn-login {
            background: transparent;
            border: 1px solid var(--text-secondary);
            color: var(--text-secondary);
            padding: 0.5rem 1.2rem;
            border-radius: var(--border-radius-btn);
            font-weight: 600;
            transition: var(--transition-base);
            cursor: pointer;
            font-size: 0.9rem;
        }
        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }
        .btn-signup {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            padding: 0.55rem 1.4rem;
            border-radius: var(--border-radius-btn);
            font-weight: 700;
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.5);
            transition: var(--transition-base);
            cursor: pointer;
            font-size: 0.9rem;
        }
        .btn-signup:hover {
            background: #1a6bff;
            box-shadow: 0 6px 20px rgba(0, 82, 255, 0.8);
            transform: translateY(-1px);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
        }

        /* ---- Hero Section (Asymmetric) ---- */
        .hero-section {
            padding: 4rem 0 3rem;
            position: relative;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 5fr 7fr;
            gap: 3rem;
            align-items: center;
        }
        .hero-text h1 {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.2;
            color: #fff;
            margin-bottom: 1.5rem;
        }
        .hero-text h1 span {
            color: var(--accent-cyan);
            text-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
        }
        .hero-text p {
            font-size: 1.2rem;
            color: var(--text-secondary);
            margin-bottom: 2rem;
        }
        .kpi-row {
            display: flex;
            gap: 2rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }
        .kpi-item {
            background: var(--card-bg);
            backdrop-filter: var(--glass-blur);
            border: 1px solid var(--card-border);
            border-radius: 1rem;
            padding: 1rem 1.5rem;
            text-align: center;
        }
        .kpi-item strong {
            display: block;
            font-size: 1.8rem;
            color: var(--accent-cyan);
        }
        .hero-image {
            background: url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            border-radius: 2rem;
            min-height: 350px;
            box-shadow: var(--shadow-glow);
            border: 1px solid rgba(255,255,255,0.1);
            transform: translateX(10px);
        }

        /* ---- Shared Section Styles ---- */
        .section {
            padding: 4rem 0;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .glass-card {
            background: var(--card-bg);
            backdrop-filter: var(--glass-blur);
            border: 1px solid var(--card-border);
            border-radius: var(--border-radius-card);
            padding: 2rem;
            transition: var(--transition-base);
        }
        .glass-card:hover {
            border-color: rgba(0, 240, 255, 0.5);
            box-shadow: var(--shadow-cyan);
        }

        .btn-primary {
            background: var(--accent-blue);
            color: #fff;
            border-radius: var(--border-radius-btn);
            padding: 0.9rem 2.2rem;
            font-weight: 700;
            display: inline-block;
            text-decoration: none;
            transition: var(--transition-base);
            border: none;
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
        }
        .btn-primary:hover {
            background: #1a6bff;
            box-shadow: 0 8px 25px rgba(0, 240, 255, 0.5);
            transform: translateY(-2px);
            color: #fff;
        }

        .problem-list {
            list-style: none;
            margin: 0;
        }
        .problem-list li {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            padding: 1.2rem 0;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .problem-list li i {
            color: var(--accent-cyan);
            font-size: 1.5rem;
            margin-top: 0.2rem;
        }

        .faq-item {
            margin-bottom: 1.5rem;
        }
        .faq-question {
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 0.5rem;
        }

        /* ---- Footer ---- */
        .site-footer {
            background: rgba(11, 18, 37, 0.9);
            backdrop-filter: blur(20px);
            border-top: 1px solid var(--card-border);
            padding: 3rem 0 2rem;
            margin-top: 2rem;
            color: var(--text-secondary);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-col h4 {
            color: #fff;
            margin-bottom: 1rem;
        }
        .footer-col a {
            color: var(--text-secondary);
            display: block;
            margin-bottom: 0.5rem;
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 1.5rem;
            font-size: 0.9rem;
        }

        /* ---- Responsive ---- */
        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .hero-image {
                min-height: 280px;
                transform: none;
            }
        }
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #0b1225;
                padding: 1rem;
                margin-top: 1rem;
                border-radius: 1rem;
            }
            .nav-menu.active-mobile {
                display: flex;
            }
            .mobile-toggle {
                display: block;
            }
            .nav-actions {
                margin-left: auto;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .hero-text h1 {
                font-size: 2.2rem;
            }
        }