/* roulang page: index */
:root {
            --color-bg-primary: #0A0E1A;
            --color-bg-secondary: rgba(15, 25, 45, 0.6);
            --color-bg-tertiary: #0F1420;
            --color-accent: #00D9FF;
            --color-accent-secondary: #7B61FF;
            --color-text-primary: #FFFFFF;
            --color-text-secondary: rgba(255, 255, 255, 0.85);
            --color-text-tertiary: rgba(255, 255, 255, 0.5);
            --color-border: rgba(255, 255, 255, 0.1);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 24px;
            --spacing-unit: 1.5rem;
            --shadow-glass: 0 8px 32px rgba(0, 217, 255, 0.15);
            --shadow-glow: 0 0 24px rgba(0, 217, 255, 0.6);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
            background: var(--color-bg-primary);
            color: var(--color-text-secondary);
            line-height: 1.6;
            overflow-x: hidden;
        }
        
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        
        a:hover {
            color: var(--color-accent);
        }
        
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        
        button, input {
            font-family: inherit;
            border: none;
            outline: none;
        }
        
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 3rem;
        }
        
        /* Header & Navigation */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: rgba(10, 14, 26, 0.9);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--color-border);
            z-index: 1000;
        }
        
        nav {
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 3rem;
        }
        
        .nav-left {
            display: flex;
            align-items: center;
            gap: 3rem;
        }
        
        .logo {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text-primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .logo-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
            font-size: 1.125rem;
        }
        
        .nav-links {
            display: flex;
            gap: 2rem;
            list-style: none;
        }
        
        .nav-links a {
            font-size: 0.95rem;
            position: relative;
            padding-bottom: 2px;
        }
        
        .nav-links a.active::after,
        .nav-links a:hover::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--color-accent);
            box-shadow: 0 0 8px var(--color-accent);
        }
        
        .nav-right {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }
        
        .search-box {
            position: relative;
        }
        
        .search-box input {
            width: 240px;
            height: 36px;
            padding: 0 1rem;
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            color: var(--color-text-primary);
            font-size: 0.9rem;
        }
        
        .search-box input::placeholder {
            color: var(--color-text-tertiary);
        }
        
        .btn-primary {
            padding: 0.75rem 2rem;
            background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
            color: var(--color-text-primary);
            border-radius: var(--radius-xl);
            font-weight: 600;
            cursor: pointer;
            box-shadow: var(--shadow-glow);
            transition: all 0.3s ease;
            font-size: 0.95rem;
        }
        
        .btn-primary:hover {
            filter: brightness(1.1);
            box-shadow: 0 0 36px rgba(0, 217, 255, 0.9);
            transform: translateY(-1px);
        }
        
        .btn-secondary {
            padding: 0.75rem 1.5rem;
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-accent);
            color: var(--color-text-primary);
            border-radius: var(--radius-md);
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .btn-secondary:hover {
            background: rgba(0, 217, 255, 0.1);
            border-color: var(--color-accent);
            box-shadow: 0 0 16px rgba(0, 217, 255, 0.3);
        }
        
        .mobile-menu-toggle {
            display: none;
            background: none;
            color: var(--color-text-primary);
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        /* Hero Section */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: 64px;
            background: linear-gradient(135deg, #0A0E1A 0%, #1A1F3A 50%, #0A0E1A 100%);
            position: relative;
            overflow: hidden;
        }
        
        .hero::before {
            content: '';
            position: absolute;
            top: 20%;
            right: 10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0, 217, 255, 0.3) 0%, transparent 70%);
            border-radius: 50%;
            filter: blur(80px);
        }
        
        .hero-content {
            display: flex;
            align-items: center;
            gap: 4rem;
            position: relative;
            z-index: 1;
        }
        
        .hero-left {
            flex: 1;
        }
        
        .hero-badge {
            display: inline-block;
            padding: 0.5rem 1rem;
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-xl);
            font-size: 0.875rem;
            margin-bottom: 1.5rem;
            color: var(--color-accent);
        }
        
        .hero-left h1 {
            font-size: clamp(2.5rem, 5vw, 4rem);
            font-weight: 700;
            color: var(--color-text-primary);
            line-height: 1.1;
            letter-spacing: -0.02em;
            margin-bottom: 1.5rem;
        }
        
        .hero-left p {
            font-size: 1.25rem;
            color: var(--color-text-secondary);
            margin-bottom: 2.5rem;
            max-width: 600px;
        }
        
        .hero-actions {
            display: flex;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        
        .hero-stats {
            display: flex;
            gap: 3rem;
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 1px solid var(--color-border);
        }
        
        .stat-item {
            flex: 1;
        }
        
        .stat-item .number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--color-accent);
            text-shadow: 0 0 20px rgba(0, 217, 255, 0.5);
            margin-bottom: 0.5rem;
        }
        
        .stat-item .label {
            font-size: 0.95rem;
            color: var(--color-text-tertiary);
        }
        
        .hero-right {
            flex: 0.67;
        }
        
        .content-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1rem;
        }
        
        .content-item {
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            text-align: center;
            transition: all 0.3s ease;
            cursor: pointer;
        }
        
        .content-item:hover {
            transform: scale(1.05);
            box-shadow: var(--shadow-glass);
            border-color: var(--color-accent);
        }
        
        .content-item-icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }
        
        .content-item-label {
            font-size: 0.95rem;
            color: var(--color-text-primary);
            font-weight: 500;
        }
        
        /* Sections */
        section {
            padding: 6rem 0;
            position: relative;
        }
        
        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }
        
        .section-badge {
            display: inline-block;
            padding: 0.5rem 1rem;
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-xl);
            font-size: 0.875rem;
            margin-bottom: 1rem;
            color: var(--color-accent);
        }
        
        .section-header h2 {
            font-size: 2rem;
            font-weight: 600;
            color: var(--color-text-primary);
            margin-bottom: 1rem;
        }
        
        .section-header p {
            font-size: 1.125rem;
            color: var(--color-text-tertiary);
            max-width: 700px;
            margin: 0 auto;
        }
        
        /* Campaign Section */
        .campaign-section {
            background: linear-gradient(135deg, rgba(0, 217, 255, 0.05) 0%, rgba(123, 97, 255, 0.05) 100%);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }
        
        .campaign-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }
        
        .progress-ring {
            position: relative;
            width: 280px;
            height: 280px;
            margin: 0 auto;
        }
        
        .progress-ring-bg {
            fill: none;
            stroke: var(--color-bg-secondary);
            stroke-width: 20;
        }
        
        .progress-ring-fill {
            fill: none;
            stroke: url(#gradient);
            stroke-width: 20;
            stroke-linecap: round;
            transform: rotate(-90deg);
            transform-origin: center;
            stroke-dasharray: 628;
            stroke-dashoffset: 157;
            transition: stroke-dashoffset 1s ease;
        }
        
        .progress-center {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
        }
        
        .progress-percent {
            font-size: 3rem;
            font-weight: 700;
            color: var(--color-accent);
            text-shadow: 0 0 20px rgba(0, 217, 255, 0.6);
        }
        
        .progress-label {
            font-size: 0.95rem;
            color: var(--color-text-tertiary);
            margin-top: 0.5rem;
        }
        
        .tier-cards {
            display: grid;
            gap: 1.5rem;
        }
        
        .tier-card {
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all 0.3s ease;
        }
        
        .tier-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-glass);
            border-color: var(--color-accent);
        }
        
        .tier-info h3 {
            font-size: 1.25rem;
            color: var(--color-text-primary);
            margin-bottom: 0.5rem;
        }
        
        .tier-info p {
            font-size: 0.95rem;
            color: var(--color-text-tertiary);
        }
        
        .tier-badge {
            padding: 0.5rem 1.25rem;
            background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
            border-radius: var(--radius-xl);
            font-weight: 600;
            font-size: 0.95rem;
        }
        
        /* Referral Section */
        .referral-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 2rem;
        }
        
        .referral-card {
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 2rem;
            box-shadow: var(--shadow-glass);
        }
        
        .referral-card-icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.75rem;
            margin-bottom: 1.5rem;
        }
        
        .referral-card h3 {
            font-size: 1.5rem;
            color: var(--color-text-primary);
            margin-bottom: 1rem;
        }
        
        .referral-card p {
            font-size: 1rem;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }
        
        /* Progress Tracker */
        .progress-tracker {
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 3rem;
            box-shadow: var(--shadow-glass);
        }
        
        .milestone-list {
            display: flex;
            justify-content: space-between;
            position: relative;
            margin-top: 2rem;
        }
        
        .milestone-list::before {
            content: '';
            position: absolute;
            top: 24px;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--color-bg-secondary);
            z-index: 0;
        }
        
        .milestone-progress {
            position: absolute;
            top: 24px;
            left: 0;
            height: 4px;
            width: 60%;
            background: linear-gradient(90deg, var(--color-accent), var(--color-accent-secondary));
            z-index: 1;
            box-shadow: 0 0 12px var(--color-accent);
        }
        
        .milestone-item {
            text-align: center;
            position: relative;
            z-index: 2;
        }
        
        .milestone-dot {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--color-bg-primary);
            border: 4px solid var(--color-border);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            font-weight: 700;
            transition: all 0.3s ease;
        }
        
        .milestone-item.completed .milestone-dot {
            border-color: var(--color-accent);
            background: var(--color-accent);
            box-shadow: 0 0 16px var(--color-accent);
        }
        
        .milestone-label {
            font-size: 0.875rem;
            color: var(--color-text-tertiary);
            margin-bottom: 0.25rem;
        }
        
        .milestone-count {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--color-text-primary);
        }
        
        /* Leaderboard */
        .leaderboard-table {
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-glass);
        }
        
        .leaderboard-header {
            display: grid;
            grid-template-columns: 80px 1fr 150px 150px;
            padding: 1.25rem 2rem;
            background: rgba(0, 217, 255, 0.05);
            border-bottom: 1px solid var(--color-border);
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--color-text-primary);
        }
        
        .leaderboard-row {
            display: grid;
            grid-template-columns: 80px 1fr 150px 150px;
            padding: 1.25rem 2rem;
            border-bottom: 1px solid var(--color-border);
            align-items: center;
            transition: all 0.3s ease;
        }
        
        .leaderboard-row:last-child {
            border-bottom: none;
        }
        
        .leaderboard-row:hover {
            background: rgba(0, 217, 255, 0.03);
        }
        
        .rank {
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--color-accent);
        }
        
        .rank-medal {
            font-size: 1.5rem;
        }
        
        .user-info {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        
        .user-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.95rem;
        }
        
        .user-name {
            color: var(--color-text-primary);
            font-weight: 500;
        }
        
        .score {
            font-weight: 600;
            color: var(--color-text-primary);
        }
        
        .reward {
            color: var(--color-accent);
            font-weight: 600;
        }
        
        /* News Section */
        .news-layout {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 3rem;
        }
        
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        
        .news-item {
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all 0.3s ease;
        }
        
        .news-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-glass);
            border-color: var(--color-accent);
        }
        
        .news-meta {
            display: flex;
            gap: 1rem;
            margin-bottom: 1rem;
        }
        
        .news-tag {
            padding: 0.25rem 0.75rem;
            background: rgba(0, 217, 255, 0.1);
            border: 1px solid var(--color-accent);
            border-radius: var(--radius-sm);
            font-size: 0.8rem;
            color: var(--color-accent);
        }
        
        .news-date {
            font-size: 0.875rem;
            color: var(--color-text-tertiary);
        }
        
        .news-item h3 {
            font-size: 1.25rem;
            color: var(--color-text-primary);
            margin-bottom: 0.75rem;
            line-height: 1.4;
        }
        
        .news-item p {
            font-size: 0.95rem;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }
        
        .news-sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        
        .sidebar-card {
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 2rem;
            box-shadow: var(--shadow-glass);
        }
        
        .sidebar-card h3 {
            font-size: 1.25rem;
            color: var(--color-text-primary);
            margin-bottom: 1.5rem;
        }
        
        .trending-list {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        
        .trending-item {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 0.75rem;
            border-radius: var(--radius-md);
            transition: all 0.3s ease;
        }
        
        .trending-item:hover {
            background: rgba(0, 217, 255, 0.05);
        }
        
        .trending-number {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 0.95rem;
            flex-shrink: 0;
        }
        
        .trending-text {
            font-size: 0.95rem;
            color: var(--color-text-secondary);
            line-height: 1.4;
        }
        
        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 217, 255, 0.1) 0%, rgba(123, 97, 255, 0.1) 100%);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
            text-align: center;
        }
        
        .cta-content {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .cta-content h2 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--color-text-primary);
            margin-bottom: 1.5rem;
        }
        
        .cta-content p {
            font-size: 1.125rem;
            color: var(--color-text-secondary);
            margin-bottom: 2.5rem;
        }
        
        .cta-actions {
            display: flex;
            gap: 1.5rem;
            justify-content: center;
            flex-wrap: wrap;
        }
        
        /* FAQ */
        .faq-list {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        
        .faq-item {
            background: var(--color-bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-glass);
        }
        
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.25rem 1.5rem;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .faq-question:hover {
            background: rgba(0, 217, 255, 0.03);
        }
        
        .faq-question h3 {
            font-size: 1.125rem;
            font-weight: 500;
            color: var(--color-text-primary);
        }
        
        .faq-icon {
            font-size: 1.25rem;
            color: var(--color-accent);
            transition: transform 0.3s ease;
        }
        
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }
        
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        
        .faq-item.active .faq-answer {
            max-height: 500px;
        }
        
        .faq-answer-content {
            padding: 0 1.5rem 1.25rem;
            color: rgba(255, 255, 255, 0.75);
            line-height: 1.7;
        }
        
        /* Footer */
        footer {
            background: var(--color-bg-tertiary);
            border-top: 1px solid var(--color-border);
            padding: 3rem 0 0;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 3rem;
            padding-bottom: 3rem;
        }
        
        .footer-brand h3 {
            font-size: 1.5rem;
            color: var(--color-text-primary);
            margin-bottom: 1rem;
        }
        
        .footer-brand p {
            color: var(--color-text-tertiary);
            line-height: 1.7;
            margin-bottom: 1.5rem;
        }
        
        .footer-links h4 {
            font-size: 1.125rem;
            color: var(--color-text-primary);
            margin-bottom: 1.25rem;
        }
        
        .footer-links ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        
        .footer-links a {
            color: var(--color-text-tertiary);
            font-size: 0.95rem;
            transition: all 0.3s ease;
        }
        
        .footer-links a:hover {
            color: var(--color-accent);
            padding-left: 0.5rem;
        }
        
        .footer-bottom {
            border-top: 1px solid var(--color-border);
            padding: 1.5rem 0;
            text-align: center;
            color: var(--color-text-tertiary);
            font-size: 0.875rem;
        }
        
        /* Responsive */
        @media (max-width: 1024px) {
            .container, nav {
                padding: 0 1.5rem;
            }
            
            .hero-content {
                flex-direction: column;
                gap: 3rem;
            }
            
            .hero-right {
                width: 100%;
            }
            
            .content-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .campaign-content {
                grid-template-columns: 1fr;
            }
            
            .referral-grid {
                grid-template-columns: 1fr;
            }
            
            .news-layout {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
            }
            
            section {
                padding: 4rem 0;
            }
        }
        
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            
            .search-box {
                display: none;
            }
            
            .mobile-menu-toggle {
                display: block;
            }
            
            .hero-stats {
                flex-direction: column;
                gap: 1.5rem;
            }
            
            .content-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .tier-card {
                flex-direction: column;
                text-align: center;
                gap: 1rem;
            }
            
            .milestone-list {
                flex-direction: column;
                gap: 1.5rem;
            }
            
            .milestone-list::before,
            .milestone-progress {
                display: none;
            }
            
            .leaderboard-header,
            .leaderboard-row {
                grid-template-columns: 60px 1fr 100px;
                padding: 1rem;
                font-size: 0.875rem;
            }
            
            .leaderboard-header > :last-child,
            .leaderboard-row > :last-child {
                display: none;
            }
            
            .cta-content h2 {
                font-size: 2rem;
            }
        }
        
        @media (max-width: 520px) {
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            
            .btn-primary,
            .btn-secondary {
                width: 100%;
                text-align: center;
            }
            
            .content-grid {
                grid-template-columns: 1fr;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: rgba(15, 25, 45, 0.6);
            --glow-primary: #00D9FF;
            --glow-secondary: #7B61FF;
            --text-primary: #FFFFFF;
            --text-secondary: rgba(255, 255, 255, 0.85);
            --text-muted: rgba(255, 255, 255, 0.5);
            --border-glass: rgba(255, 255, 255, 0.1);
            --spacing: 1.5rem;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 24px;
        }

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

        body {
            font-family: -apple-system, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
            background: var(--bg-primary);
            color: var(--text-secondary);
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.3s ease;
        }

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

        button, input {
            font-family: inherit;
            border: none;
            outline: none;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 3rem;
        }

        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(10, 14, 26, 0.9);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-glass);
        }

        nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            padding: 0 3rem;
        }

        .nav-left {
            display: flex;
            align-items: center;
            gap: 3rem;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-weight: 600;
            font-size: 1.125rem;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--glow-primary), var(--glow-secondary));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
        }

        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
        }

        .nav-links a {
            font-size: 0.95rem;
            position: relative;
            padding: 0.5rem 0;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--glow-primary);
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--glow-primary);
            box-shadow: 0 0 8px var(--glow-primary);
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }

        .search-box {
            position: relative;
        }

        .search-box input {
            width: 240px;
            padding: 0.625rem 1rem;
            background: var(--bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: 8px;
            color: var(--text-primary);
            font-size: 0.875rem;
        }

        .search-box input::placeholder {
            color: var(--text-muted);
        }

        .btn-primary {
            padding: 0.625rem 1.5rem;
            background: linear-gradient(135deg, var(--glow-primary), var(--glow-secondary));
            color: var(--text-primary);
            border-radius: var(--radius-lg);
            font-weight: 500;
            font-size: 0.95rem;
            cursor: pointer;
            box-shadow: 0 0 24px rgba(0, 217, 255, 0.6);
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            filter: brightness(1.1);
            box-shadow: 0 0 36px rgba(0, 217, 255, 0.9);
            transform: translateY(-2px);
        }

        .mobile-menu-toggle {
            display: none;
            font-size: 1.5rem;
            background: none;
            color: var(--text-primary);
            cursor: pointer;
        }

        .breadcrumb {
            padding: 2rem 0 1rem;
            font-size: 0.875rem;
            color: var(--text-muted);
        }

        .breadcrumb a:hover {
            color: var(--glow-primary);
        }

        .breadcrumb span {
            margin: 0 0.5rem;
        }

        .page-hero {
            padding: 3rem 0 4rem;
            position: relative;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            top: -100px;
            right: -100px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 217, 255, 0.15), transparent 70%);
            pointer-events: none;
        }

        .hero-content {
            max-width: 900px;
        }

        .hero-content h1 {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }

        .hero-content .subtitle {
            font-size: 1.125rem;
            color: var(--text-muted);
            margin-bottom: 2rem;
            line-height: 1.7;
        }

        .quality-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
            margin-bottom: 2rem;
        }

        .badge {
            padding: 0.5rem 1rem;
            background: var(--bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            font-size: 0.875rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .badge-icon {
            width: 6px;
            height: 6px;
            background: var(--glow-primary);
            border-radius: 50%;
            box-shadow: 0 0 8px var(--glow-primary);
        }

        .filter-section {
            padding: 3rem 0;
            border-top: 1px solid var(--border-glass);
        }

        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin-bottom: 3rem;
        }

        .filter-btn {
            padding: 0.625rem 1.25rem;
            background: var(--bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 0.875rem;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .filter-btn:hover,
        .filter-btn.active {
            background: linear-gradient(135deg, var(--glow-primary), var(--glow-secondary));
            border-color: transparent;
            color: var(--text-primary);
            box-shadow: 0 0 16px rgba(0, 217, 255, 0.4);
        }

        .content-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            margin-bottom: 3rem;
        }

        .video-card {
            background: var(--bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .video-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 48px rgba(0, 217, 255, 0.3);
            border-color: var(--glow-primary);
        }

        .video-thumbnail {
            position: relative;
            width: 100%;
            padding-top: 56.25%;
            background: linear-gradient(135deg, #1A1F3A, #0F1420);
            overflow: hidden;
        }

        .video-thumbnail img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .duration-badge {
            position: absolute;
            bottom: 0.5rem;
            right: 0.5rem;
            padding: 0.25rem 0.5rem;
            background: rgba(0, 0, 0, 0.8);
            color: var(--text-primary);
            font-size: 0.75rem;
            border-radius: 4px;
        }

        .quality-badge {
            position: absolute;
            top: 0.5rem;
            left: 0.5rem;
            padding: 0.25rem 0.625rem;
            background: linear-gradient(135deg, var(--glow-primary), var(--glow-secondary));
            color: var(--text-primary);
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: 4px;
            box-shadow: 0 0 12px rgba(0, 217, 255, 0.6);
        }

        .video-info {
            padding: 1rem;
        }

        .video-title {
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            line-height: 1.4;
        }

        .video-card:hover .video-title {
            color: var(--glow-primary);
        }

        .video-meta {
            display: flex;
            justify-content: space-between;
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        .features-section {
            padding: 5rem 0;
            background: linear-gradient(180deg, transparent, rgba(15, 25, 45, 0.3), transparent);
        }

        .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 3rem;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 2rem;
        }

        .feature-card {
            background: var(--bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 2rem;
            transition: all 0.3s ease;
        }

        .feature-card:hover {
            box-shadow: 0 8px 32px rgba(0, 217, 255, 0.2);
            border-color: var(--glow-primary);
        }

        .feature-icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, var(--glow-primary), var(--glow-secondary));
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .feature-card h3 {
            font-size: 1.25rem;
            color: var(--text-primary);
            margin-bottom: 0.75rem;
        }

        .feature-card p {
            color: var(--text-muted);
            line-height: 1.7;
        }

        .specs-section {
            padding: 5rem 0;
        }

        .specs-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }

        .spec-card {
            background: var(--bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 2rem 1.5rem;
            text-align: center;
        }

        .spec-value {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--glow-primary);
            text-shadow: 0 0 24px rgba(0, 217, 255, 0.6);
            margin-bottom: 0.5rem;
        }

        .spec-label {
            font-size: 0.875rem;
            color: var(--text-muted);
        }

        .faq-section {
            padding: 5rem 0;
        }

        .faq-list {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .faq-item {
            background: var(--bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            overflow: hidden;
        }

        .faq-question {
            padding: 1.25rem 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 500;
            color: var(--text-primary);
            transition: all 0.3s ease;
        }

        .faq-item:hover .faq-question {
            background: rgba(0, 217, 255, 0.05);
        }

        .faq-answer {
            padding: 0 1.5rem 1.25rem;
            color: var(--text-muted);
            line-height: 1.7;
            font-size: 0.95rem;
        }

        .cta-section {
            padding: 5rem 0;
            text-align: center;
        }

        .cta-box {
            max-width: 700px;
            margin: 0 auto;
            padding: 3rem 2rem;
            background: var(--bg-secondary);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            box-shadow: 0 8px 32px rgba(0, 217, 255, 0.15);
        }

        .cta-box h2 {
            font-size: 1.75rem;
            color: var(--text-primary);
            margin-bottom: 1rem;
        }

        .cta-box p {
            color: var(--text-muted);
            margin-bottom: 2rem;
            font-size: 1.05rem;
        }

        .btn-cta-large {
            padding: 1rem 2.5rem;
            background: linear-gradient(135deg, var(--glow-primary), var(--glow-secondary));
            color: var(--text-primary);
            border-radius: var(--radius-lg);
            font-weight: 600;
            font-size: 1.125rem;
            cursor: pointer;
            box-shadow: 0 0 32px rgba(0, 217, 255, 0.6);
            transition: all 0.3s ease;
            display: inline-block;
        }

        .btn-cta-large:hover {
            filter: brightness(1.15);
            box-shadow: 0 0 48px rgba(0, 217, 255, 0.9);
            transform: translateY(-3px);
        }

        footer {
            background: #0F1420;
            border-top: 1px solid var(--border-glass);
            padding: 3rem 0 0;
        }

        .footer-content {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 3rem;
            padding-bottom: 2rem;
        }

        .footer-brand h3 {
            color: var(--text-primary);
            font-size: 1.25rem;
            margin-bottom: 1rem;
        }

        .footer-brand p {
            color: var(--text-muted);
            line-height: 1.7;
            font-size: 0.95rem;
        }

        .footer-links h4 {
            color: var(--text-primary);
            font-size: 1rem;
            margin-bottom: 1rem;
        }

        .footer-links ul {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 0.625rem;
        }

        .footer-links a {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        .footer-links a:hover {
            color: var(--glow-primary);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-glass);
            padding: 1.5rem 0;
            text-align: center;
        }

        .footer-bottom p {
            color: var(--text-muted);
            font-size: 0.875rem;
        }

        @media (max-width: 1024px) {
            .container, nav {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }

            .content-grid {
                grid-template-columns: repeat(3, 1fr);
            }

            .specs-grid {
                grid-template-columns: repeat(2, 1fr);
            }

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

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

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

        @media (max-width: 768px) {
            .nav-left {
                gap: 1.5rem;
            }

            .nav-links,
            .nav-right {
                display: none;
            }

            .mobile-menu-toggle {
                display: block;
            }

            .content-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1rem;
            }

            .specs-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1rem;
            }

            .hero-content h1 {
                font-size: 1.75rem;
            }

            .section-title {
                font-size: 1.5rem;
            }

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

        @media (max-width: 640px) {
            .content-grid {
                grid-template-columns: 1fr;
            }

            .quality-badges {
                gap: 0.5rem;
            }

            .badge {
                font-size: 0.8rem;
                padding: 0.4rem 0.75rem;
            }

            .filter-bar {
                gap: 0.5rem;
            }

            .filter-btn {
                font-size: 0.8rem;
                padding: 0.5rem 1rem;
            }

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

            .spec-value {
                font-size: 2rem;
            }

            .cta-box {
                padding: 2rem 1.5rem;
            }

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

            .btn-cta-large {
                padding: 0.875rem 2rem;
                font-size: 1rem;
            }
        }