/* roulang page: index */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: #111624;
            --accent-primary: #0052FF;
            --accent-secondary: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #8892A6;
            --border-color: rgba(0, 240, 255, 0.15);
            --border-hover: rgba(0, 240, 255, 0.45);
            --glow-cyan: rgba(0, 240, 255, 0.5);
            --glow-blue: rgba(0, 82, 255, 0.5);
            --gradient-hero: linear-gradient(135deg, #08090F 0%, #0D111E 50%, #111B33 100%);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
            --transition-fast: 0.2s ease;
            --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: 'Inter', 'Segoe UI', 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: 1rem;
        }

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

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

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

        /* Header & Navigation */
        .site-header {
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.12);
            position: sticky;
            top: 0;
            z-index: 1050;
            padding: 0.75rem 0;
            transition: all var(--transition-base);
        }
        .site-header.scrolled {
            background: rgba(8, 9, 15, 0.98);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--text-primary) !important;
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .navbar-brand .brand-icon {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.2rem;
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.4);
        }
        .navbar-nav .nav-link {
            color: var(--text-secondary);
            font-weight: 500;
            padding: 0.5rem 1rem !important;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            position: relative;
            font-size: 0.95rem;
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: var(--text-primary);
            background: rgba(0, 240, 255, 0.08);
        }
        .navbar-nav .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent-secondary);
            border-radius: 2px;
        }
        .btn-login {
            color: var(--text-secondary);
            font-weight: 600;
            padding: 0.5rem 1.2rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            font-size: 0.9rem;
        }
        .btn-login:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }
        .btn-signup {
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            color: #fff;
            font-weight: 700;
            padding: 0.5rem 1.4rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            font-size: 0.9rem;
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
        }
        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 25px rgba(0, 240, 255, 0.5);
            color: #fff;
        }
        .navbar-toggler {
            border: 1px solid rgba(0, 240, 255, 0.3);
            padding: 0.4rem 0.7rem;
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.2);
        }
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%2300F0FF' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* Hero Section */
        .hero-section {
            background: var(--gradient-hero);
            padding: 5rem 0 4rem;
            position: relative;
            overflow: hidden;
            min-height: 85vh;
            display: flex;
            align-items: center;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -20%;
            left: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 82, 255, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -20%;
            right: -10%;
            width: 600px;
            height: 600px;
            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-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.25);
            padding: 0.4rem 1rem;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-secondary);
            margin-bottom: 1.5rem;
        }
        .hero-title {
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            font-weight: 800;
            letter-spacing: -0.03em;
            line-height: 1.15;
            margin-bottom: 1.5rem;
            background: linear-gradient(135deg, #fff 0%, #CBD5E1 60%, #00F0FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-description {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 600px;
            line-height: 1.7;
            margin-bottom: 2rem;
        }
        .hero-stats {
            display: flex;
            gap: 2.5rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }
        .hero-stat {
            text-align: left;
        }
        .hero-stat .stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-secondary);
            line-height: 1.2;
        }
        .hero-stat .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            font-weight: 500;
        }
        .hero-cta-group {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            margin-bottom: 2rem;
        }
        .btn-primary-cta {
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            color: #fff;
            font-weight: 700;
            padding: 0.9rem 2.2rem;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            transition: all var(--transition-base);
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.4);
            border: none;
        }
        .btn-primary-cta:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 35px rgba(0, 240, 255, 0.5);
            color: #fff;
        }
        .btn-secondary-cta {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 0.9rem 2rem;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            border: 1px solid rgba(0, 240, 255, 0.35);
            transition: all var(--transition-base);
        }
        .btn-secondary-cta:hover {
            border-color: var(--accent-secondary);
            background: rgba(0, 240, 255, 0.08);
            color: var(--text-primary);
        }
        .hero-icon-matrix {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1rem;
            margin-top: 2rem;
        }
        .hero-icon-item {
            background: rgba(17, 22, 36, 0.7);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 1.5rem 1rem;
            text-align: center;
            transition: all var(--transition-base);
        }
        .hero-icon-item:hover {
            border-color: var(--border-hover);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
        }
        .hero-icon-item i {
            font-size: 2rem;
            color: var(--accent-secondary);
            margin-bottom: 0.75rem;
        }
        .hero-icon-item span {
            display: block;
            font-size: 0.8rem;
            color: var(--text-secondary);
            font-weight: 500;
        }
        .hero-status-bar {
            display: flex;
            align-items: center;
            gap: 1rem;
            background: rgba(0, 240, 255, 0.06);
            border: 1px solid rgba(0, 240, 255, 0.2);
            border-radius: var(--radius-md);
            padding: 0.8rem 1.5rem;
            margin-top: 1.5rem;
            flex-wrap: wrap;
        }
        .status-dot {
            width: 8px;
            height: 8px;
            background: #32CD32;
            border-radius: 50%;
            animation: pulse-dot 1.5s infinite;
        }
        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(1.5); }
        }
        .status-text {
            color: var(--text-secondary);
            font-size: 0.9rem;
            font-weight: 500;
        }

        /* Section Base */
        .section-block {
            padding: 5rem 0;
            position: relative;
        }
        .section-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 1rem;
        }
        .section-desc {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 700px;
            line-height: 1.7;
            margin-bottom: 2.5rem;
        }

        /* Collection Directory */
        .collection-directory {
            background: var(--bg-secondary);
        }
        .collection-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
        }
        .collection-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
            position: relative;
        }
        .collection-card:hover {
            border-color: var(--border-hover);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.2);
            transform: translateY(-5px);
        }
        .collection-card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-bottom: 1px solid var(--border-color);
        }
        .collection-card-body {
            padding: 1.5rem;
        }
        .collection-card-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .collection-card-text {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.6;
            margin-bottom: 1rem;
        }
        .collection-card-link {
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }

        /* Featured Recommendation */
        .featured-recommendation {
            background: var(--bg-primary);
        }
        .featured-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            align-items: center;
        }
        .featured-image-wrapper {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }
        .featured-image-wrapper img {
            width: 100%;
            height: 350px;
            object-fit: cover;
        }
        .featured-image-wrapper::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(8, 9, 15, 0.8) 0%, transparent 50%);
        }
        .featured-badge {
            position: absolute;
            top: 1rem;
            left: 1rem;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            color: #fff;
            padding: 0.4rem 1.2rem;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.8rem;
            z-index: 2;
        }
        .featured-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .featured-list li {
            padding: 0.75rem 0;
            border-bottom: 1px solid rgba(0, 240, 255, 0.1);
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 0.95rem;
        }
        .featured-list li:last-child {
            border-bottom: none;
        }
        .featured-list li i {
            color: var(--accent-secondary);
            font-size: 1rem;
        }

        /* Latest News */
        .latest-news {
            background: var(--bg-secondary);
        }
        .news-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }
        .news-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .news-list-item {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 1rem 0;
            border-bottom: 1px solid rgba(0, 240, 255, 0.1);
            transition: all var(--transition-fast);
        }
        .news-list-item:hover {
            padding-left: 0.5rem;
        }
        .news-list-item:last-child {
            border-bottom: none;
        }
        .news-list-item .news-index {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.85rem;
            color: var(--accent-secondary);
            flex-shrink: 0;
        }
        .news-list-item .news-title-link {
            font-weight: 600;
            color: var(--text-primary);
            font-size: 0.95rem;
            flex: 1;
            transition: color var(--transition-fast);
        }
        .news-list-item .news-title-link:hover {
            color: var(--accent-secondary);
        }
        .news-list-item .news-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            white-space: nowrap;
        }
        .news-recommend {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 1.5rem;
        }
        .news-recommend-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--accent-secondary);
        }
        .news-recommend-item {
            display: flex;
            gap: 0.75rem;
            padding: 0.75rem 0;
            border-bottom: 1px solid rgba(0, 240, 255, 0.1);
        }
        .news-recommend-item:last-child {
            border-bottom: none;
        }
        .news-recommend-item i {
            color: var(--accent-secondary);
            font-size: 0.8rem;
            margin-top: 0.3rem;
        }
        .news-recommend-item span {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* Collection & Share */
        .collection-share {
            background: var(--bg-primary);
        }
        .share-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            align-items: center;
        }
        .share-image-wrapper {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }
        .share-image-wrapper img {
            width: 100%;
            height: 300px;
            object-fit: cover;
        }
        .share-buttons {
            display: flex;
            gap: 0.75rem;
            flex-wrap: wrap;
            margin-top: 1.5rem;
        }
        .share-btn {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            border: 1px solid var(--border-color);
            background: var(--bg-card);
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            transition: all var(--transition-base);
        }
        .share-btn:hover {
            border-color: var(--accent-secondary);
            color: var(--accent-secondary);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
        }

        /* FAQ Section */
        .faq-section {
            background: var(--bg-secondary);
        }
        .accordion-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md) !important;
            margin-bottom: 1rem;
            overflow: hidden;
        }
        .accordion-button {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 1.2rem 1.5rem;
            font-size: 1rem;
        }
        .accordion-button:not(.collapsed) {
            background: rgba(0, 240, 255, 0.06);
            color: var(--accent-secondary);
            box-shadow: none;
        }
        .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.2);
            border-color: var(--border-hover);
        }
        .accordion-button::after {
            filter: invert(1) brightness(2);
        }
        .accordion-body {
            color: var(--text-secondary);
            line-height: 1.7;
            padding: 1.2rem 1.5rem;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.15) 0%, rgba(0, 240, 255, 0.08) 100%);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            padding: 4rem 0;
            text-align: center;
        }
        .cta-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            font-weight: 800;
            margin-bottom: 1rem;
        }
        .cta-desc {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 2rem;
            font-size: 1.05rem;
            line-height: 1.7;
        }

        /* Guest Highlights */
        .guest-highlights {
            background: var(--bg-primary);
        }
        .guest-scroll {
            display: flex;
            gap: 1.5rem;
            overflow-x: auto;
            padding-bottom: 1rem;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
        }
        .guest-scroll::-webkit-scrollbar {
            height: 6px;
        }
        .guest-scroll::-webkit-scrollbar-track {
            background: var(--bg-secondary);
            border-radius: 3px;
        }
        .guest-scroll::-webkit-scrollbar-thumb {
            background: var(--accent-secondary);
            border-radius: 3px;
        }
        .guest-card {
            min-width: 260px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            scroll-snap-align: start;
            transition: all var(--transition-base);
        }
        .guest-card:hover {
            border-color: var(--border-hover);
            box-shadow: var(--shadow-glow);
        }
        .guest-avatar {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: #fff;
            margin-bottom: 1rem;
        }
        .guest-name {
            font-weight: 700;
            font-size: 1rem;
            margin-bottom: 0.4rem;
        }
        .guest-desc {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Hot Topics */
        .hot-topics {
            background: var(--bg-secondary);
        }
        .topic-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
        }
        .topic-tag {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 0.6rem 1.2rem;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
        }
        .topic-tag:hover {
            border-color: var(--accent-secondary);
            color: var(--accent-secondary);
            box-shadow: var(--shadow-glow);
        }

        /* Usage Guide */
        .usage-guide {
            background: var(--bg-primary);
        }
        .guide-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
        }
        .guide-item {
            padding: 1.5rem;
            border-left: 3px solid var(--accent-secondary);
            background: rgba(0, 240, 255, 0.03);
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
        }
        .guide-item h4 {
            font-size: 1rem;
            margin-bottom: 0.5rem;
            color: var(--accent-secondary);
        }
        .guide-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 0;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-primary);
            border-top: 1px solid var(--border-color);
            padding: 3rem 0 2rem;
            color: var(--text-secondary);
        }
        .footer-brand {
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--text-primary);
            margin-bottom: 1rem;
        }
        .footer-desc {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 1.5rem;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 0.5rem;
        }
        .footer-links a {
            color: var(--text-secondary);
            font-size: 0.9rem;
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: var(--accent-secondary);
        }
        .footer-bottom {
            border-top: 1px solid rgba(0, 240, 255, 0.1);
            padding-top: 1.5rem;
            margin-top: 2rem;
            font-size: 0.85rem;
            color: var(--text-muted);
            text-align: center;
        }

        /* FAB */
        .fab-support {
            position: fixed;
            left: 1.5rem;
            bottom: 6rem;
            z-index: 1060;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.7);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(8, 9, 15, 0.7), rgba(8, 9, 15, 0.7)), linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-secondary);
            font-size: 1.4rem;
            cursor: pointer;
            transition: all var(--transition-base);
            opacity: 0.6;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
        }
        .fab-support:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.8);
        }
        .fab-support:active {
            transform: scale(0.95);
        }
        .fab-support .notification-dot {
            position: absolute;
            top: -2px;
            right: -2px;
            width: 14px;
            height: 14px;
            background: #FF007F;
            border-radius: 50%;
            border: 2px solid var(--bg-primary);
            animation: blink-dot 1.2s infinite;
        }
        @keyframes blink-dot {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.3; }
        }

        /* Responsive */
        @media (max-width: 992px) {
            .hero-section {
                min-height: auto;
                padding: 4rem 0 3rem;
            }
            .featured-grid,
            .news-layout,
            .share-grid {
                grid-template-columns: 1fr;
            }
            .hero-icon-matrix {
                grid-template-columns: repeat(2, 1fr);
            }
            .featured-image-wrapper img,
            .share-image-wrapper img {
                height: 250px;
            }
        }
        @media (max-width: 768px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .section-block {
                padding: 3.5rem 0;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-stats {
                gap: 1.5rem;
            }
            .hero-stat .stat-number {
                font-size: 1.5rem;
            }
            .collection-grid {
                grid-template-columns: 1fr;
            }
            .guide-list {
                grid-template-columns: 1fr;
            }
            .navbar-brand {
                font-size: 1rem;
            }
            .navbar-brand .brand-icon {
                width: 30px;
                height: 30px;
                font-size: 1rem;
            }
        }
        @media (max-width: 520px) {
            .hero-icon-matrix {
                grid-template-columns: 1fr 1fr;
                gap: 0.75rem;
            }
            .hero-icon-item {
                padding: 1rem 0.5rem;
            }
            .hero-cta-group {
                flex-direction: column;
            }
            .btn-primary-cta,
            .btn-secondary-cta {
                width: 100%;
                text-align: center;
            }
            .hero-status-bar {
                flex-direction: column;
                align-items: flex-start;
                gap: 0.5rem;
            }
            .guest-card {
                min-width: 220px;
            }
            .fab-support {
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
                left: 1rem;
                bottom: 5rem;
            }
        }

/* roulang page: article */
:root {
            --bg-deep: #0f0c20;
            --bg-card: #171332;
            --bg-glass: rgba(23, 19, 50, 0.75);
            --bg-glass-light: rgba(31, 26, 68, 0.5);
            --border-glass: rgba(139, 92, 246, 0.25);
            --border-glow: rgba(168, 85, 247, 0.45);
            --accent-primary: #8b5cf6;
            --accent-secondary: #a855f7;
            --accent-cyan: #00f0ff;
            --accent-lime: #ccff00;
            --accent-pink: #ff007f;
            --text-primary: #ffffff;
            --text-secondary: #a6acaf;
            --text-muted: #7a7e8a;
            --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.25);
            --shadow-glow-lg: 0 0 40px rgba(139, 92, 246, 0.4);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 64px;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', 'Roboto', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            background: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.6;
            min-height: 100vh;
            overflow-x: hidden;
            position: relative;
        }
        
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(ellipse at 20% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 80%, rgba(0, 240, 255, 0.05) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 50%, rgba(255, 0, 127, 0.03) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }
        
        .container {
            position: relative;
            z-index: 1;
        }
        
        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        
        a:hover {
            color: #66f5ff;
        }
        
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        
        /* Header / Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(15, 12, 32, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-glass);
            padding: 0;
            transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
        }
        
        .site-header.scrolled {
            background: rgba(15, 12, 32, 0.98);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
        }
        
        .navbar {
            padding: 12px 0;
        }
        
        .navbar-brand {
            font-weight: 800;
            font-size: 1.15rem;
            color: var(--text-primary) !important;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.02em;
        }
        
        .brand-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
            flex-shrink: 0;
        }
        
        .navbar-nav .nav-link {
            color: var(--text-secondary) !important;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 16px !important;
            border-radius: 8px;
            transition: all var(--transition-fast);
            position: relative;
        }
        
        .navbar-nav .nav-link:hover {
            color: var(--text-primary) !important;
            background: rgba(139, 92, 246, 0.1);
        }
        
        .navbar-nav .nav-link.active {
            color: var(--accent-cyan) !important;
            background: rgba(0, 240, 255, 0.08);
        }
        
        .btn-login {
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 8px 16px;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        
        .btn-login:hover {
            color: var(--text-primary);
        }
        
        .btn-signup {
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            color: #fff !important;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 20px;
            border-radius: 10px;
            border: none;
            transition: all var(--transition-fast);
            box-shadow: 0 4px 16px rgba(139, 92, 246, 0.35);
            white-space: nowrap;
        }
        
        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(139, 92, 246, 0.5);
            background: linear-gradient(135deg, #9d6ff7, #b86bff);
            color: #fff !important;
        }
        
        .btn-signup:active {
            transform: translateY(0);
        }
        
        .navbar-toggler {
            border: 1px solid var(--border-glass);
            padding: 8px 10px;
            border-radius: 8px;
        }
        
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.3);
        }
        
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }
        
        /* Article Layout */
        .article-wrapper {
            padding-top: 90px;
            padding-bottom: var(--spacing-xl);
            min-height: 100vh;
            position: relative;
            z-index: 1;
        }
        
        .article-hero {
            background: 
                linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(15, 12, 32, 0.9) 40%, rgba(15, 12, 32, 0.95) 100%),
                url('/assets/images/backpic/back-3.jpg') center/cover no-repeat;
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-xl);
            padding: var(--spacing-xl) var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
            position: relative;
            overflow: hidden;
        }
        
        .article-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(0, 240, 255, 0.05));
            pointer-events: none;
        }
        
        .article-hero-content {
            position: relative;
            z-index: 1;
        }
        
        .article-category-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(139, 92, 246, 0.25);
            border: 1px solid var(--border-glow);
            color: var(--accent-cyan);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.02em;
        }
        
        .article-title {
            font-size: clamp(1.8rem, 4vw, 2.6rem);
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.03em;
        }
        
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            color: var(--text-secondary);
            font-size: 0.9rem;
            align-items: center;
        }
        
        .article-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        
        .article-meta .divider {
            width: 1px;
            height: 18px;
            background: rgba(166, 172, 175, 0.3);
        }
        
        .article-main {
            display: grid;
            grid-template-columns: 1fr;
            gap: var(--spacing-lg);
        }
        
        .article-content {
            background: var(--bg-glass);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            line-height: 1.7;
            font-size: 1.05rem;
            color: var(--text-secondary);
        }
        
        .article-content h1 {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-primary);
            margin: var(--spacing-md) 0 var(--spacing-sm);
            line-height: 1.3;
        }
        
        .article-content h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: var(--spacing-md) 0 var(--spacing-sm);
            line-height: 1.35;
        }
        
        .article-content h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: var(--spacing-md) 0 var(--spacing-sm);
        }
        
        .article-content p {
            margin-bottom: var(--spacing-sm);
            color: var(--text-secondary);
        }
        
        .article-content ul,
        .article-content ol {
            margin-bottom: var(--spacing-sm);
            padding-left: 1.5rem;
            color: var(--text-secondary);
        }
        
        .article-content li {
            margin-bottom: var(--spacing-xs);
        }
        
        .article-content img {
            border-radius: var(--radius-lg);
            margin: var(--spacing-md) 0;
            box-shadow: var(--shadow-glow);
            border: 1px solid var(--border-glass);
        }
        
        .article-content blockquote {
            border-left: 4px solid var(--accent-primary);
            background: rgba(139, 92, 246, 0.1);
            padding: var(--spacing-sm) var(--spacing-md);
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin: var(--spacing-md) 0;
            color: var(--text-primary);
            font-style: italic;
        }
        
        .article-content a {
            color: var(--accent-cyan);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        
        .article-content a:hover {
            color: #66f5ff;
        }
        
        .article-content strong {
            color: var(--text-primary);
            font-weight: 700;
        }
        
        /* Article Sidebar */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-md);
        }
        
        .sidebar-widget {
            background: var(--bg-glass);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }
        
        .sidebar-widget h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .sidebar-widget h3 i {
            color: var(--accent-cyan);
        }
        
        .related-post-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        
        .related-post-list li {
            padding: var(--spacing-xs) 0;
            border-bottom: 1px solid rgba(166, 172, 175, 0.1);
        }
        
        .related-post-list li:last-child {
            border-bottom: none;
        }
        
        .related-post-list a {
            color: var(--text-secondary);
            font-size: 0.92rem;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: color var(--transition-fast);
        }
        
        .related-post-list a:hover {
            color: var(--accent-cyan);
        }
        
        .related-post-list a i {
            font-size: 0.7rem;
            color: var(--accent-primary);
        }
        
        .download-mini-card {
            background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(0, 240, 255, 0.1));
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            text-align: center;
        }
        
        .download-mini-card .icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto var(--spacing-sm);
            font-size: 1.4rem;
            color: #fff;
            box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
        }
        
        .download-mini-card h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: var(--spacing-xs);
        }
        
        .download-mini-card p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-bottom: var(--spacing-sm);
        }
        
        .btn-download-sm {
            display: inline-block;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 20px;
            border-radius: 10px;
            border: none;
            transition: all var(--transition-fast);
            box-shadow: 0 4px 16px rgba(139, 92, 246, 0.35);
        }
        
        .btn-download-sm:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(139, 92, 246, 0.5);
            color: #fff;
        }
        
        /* Content Not Found */
        .content-not-found {
            text-align: center;
            padding: var(--spacing-xl) var(--spacing-lg);
            background: var(--bg-glass);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-xl);
            min-height: 400px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-md);
        }
        
        .content-not-found .icon {
            width: 80px;
            height: 80px;
            background: rgba(139, 92, 246, 0.15);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            color: var(--accent-primary);
            border: 2px solid var(--border-glass);
        }
        
        .content-not-found h2 {
            font-size: 1.6rem;
            font-weight: 700;
        }
        
        .content-not-found p {
            color: var(--text-secondary);
            max-width: 500px;
        }
        
        .btn-back-home {
            display: inline-block;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            color: #fff;
            font-weight: 700;
            padding: 12px 28px;
            border-radius: 12px;
            border: none;
            transition: all var(--transition-fast);
            box-shadow: 0 4px 16px rgba(139, 92, 246, 0.35);
        }
        
        .btn-back-home:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(139, 92, 246, 0.5);
            color: #fff;
        }
        
        /* CTA Section */
        .article-cta {
            background: 
                linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(0, 240, 255, 0.1)),
                url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            margin-top: var(--spacing-lg);
            position: relative;
            overflow: hidden;
        }
        
        .article-cta::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(139, 92, 246, 0.3), rgba(15, 12, 32, 0.7));
            pointer-events: none;
        }
        
        .article-cta-content {
            position: relative;
            z-index: 1;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: var(--spacing-sm);
        }
        
        .article-cta h2 {
            font-size: 1.6rem;
            font-weight: 800;
            margin-bottom: var(--spacing-xs);
        }
        
        .article-cta p {
            color: var(--text-secondary);
            margin-bottom: var(--spacing-sm);
            max-width: 600px;
        }
        
        .btn-cta-primary {
            display: inline-block;
            background: linear-gradient(135deg, var(--accent-lime), #a8e600);
            color: #0f0c20;
            font-weight: 800;
            padding: 14px 32px;
            border-radius: 14px;
            border: none;
            font-size: 1rem;
            transition: all var(--transition-fast);
            box-shadow: 0 6px 24px rgba(204, 255, 0, 0.35);
            letter-spacing: -0.01em;
        }
        
        .btn-cta-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 32px rgba(204, 255, 0, 0.5);
            color: #0f0c20;
        }
        
        .btn-cta-primary:active {
            transform: translateY(0);
        }
        
        /* Footer */
        .site-footer {
            background: rgba(10, 8, 20, 0.95);
            border-top: 1px solid var(--border-glass);
            padding: var(--spacing-xl) 0 var(--spacing-md);
            position: relative;
            z-index: 1;
        }
        
        .footer-brand {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.02em;
        }
        
        .footer-desc {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: var(--spacing-sm);
        }
        
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        
        .footer-links li {
            margin-bottom: var(--spacing-xs);
        }
        
        .footer-links a {
            color: var(--text-secondary);
            font-size: 0.92rem;
            transition: color var(--transition-fast);
        }
        
        .footer-links a:hover {
            color: var(--accent-cyan);
        }
        
        .footer-bottom {
            border-top: 1px solid rgba(166, 172, 175, 0.15);
            margin-top: var(--spacing-lg);
            padding-top: var(--spacing-md);
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
        }
        
        /* FAB */
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 1050;
            width: 52px;
            height: 52px;
            background: rgba(0, 0, 0, 0.7);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), linear-gradient(135deg, var(--accent-lime), var(--accent-cyan), var(--accent-primary));
            background-origin: border-box;
            background-clip: padding-box, border-box;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.2rem;
            cursor: pointer;
            transition: all var(--transition-smooth);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
            animation: fabBreathing 3s ease-in-out infinite;
        }
        
        .fab-left:hover {
            transform: scale(1.1);
            box-shadow: 0 0 32px rgba(0, 240, 255, 0.6);
            animation-play-state: paused;
        }
        
        .fab-left:active {
            transform: scale(0.95);
            border-color: var(--accent-pink);
        }
        
        .fab-notification {
            position: absolute;
            top: 2px;
            right: 2px;
            width: 14px;
            height: 14px;
            background: var(--accent-pink);
            border-radius: 50%;
            border: 2px solid #0f0c20;
            animation: fabNotifPulse 2s ease-in-out infinite;
        }
        
        @keyframes fabBreathing {
            0%, 100% {
                opacity: 0.65;
                box-shadow: 0 0 16px rgba(0, 240, 255, 0.3);
            }
            50% {
                opacity: 1;
                box-shadow: 0 0 28px rgba(0, 240, 255, 0.5);
            }
        }
        
        @keyframes fabNotifPulse {
            0%, 100% {
                transform: scale(1);
                opacity: 1;
            }
            50% {
                transform: scale(1.3);
                opacity: 0.7;
            }
        }
        
        /* Responsive */
        @media (min-width: 992px) {
            .article-main {
                grid-template-columns: 1fr 320px;
                gap: var(--spacing-lg);
            }
            
            .article-sidebar {
                position: sticky;
                top: 100px;
                align-self: start;
            }
        }
        
        @media (max-width: 991.98px) {
            .navbar-collapse {
                background: rgba(15, 12, 32, 0.98);
                border-radius: var(--radius-lg);
                padding: var(--spacing-sm);
                margin-top: var(--spacing-xs);
                border: 1px solid var(--border-glass);
            }
            
            .navbar-nav {
                margin-bottom: var(--spacing-sm);
            }
            
            .d-flex.align-items-center.gap-2 {
                flex-wrap: wrap;
            }
            
            .btn-login,
            .btn-signup {
                display: inline-block;
            }
            
            .article-hero {
                padding: var(--spacing-lg) var(--spacing-md);
            }
            
            .article-content {
                padding: var(--spacing-md);
                font-size: 1rem;
            }
        }
        
        @media (max-width: 767.98px) {
            .article-wrapper {
                padding-top: 75px;
                padding-bottom: var(--spacing-lg);
            }
            
            .article-hero {
                border-radius: var(--radius-lg);
                padding: var(--spacing-md) var(--spacing-sm);
            }
            
            .article-title {
                font-size: 1.5rem;
            }
            
            .article-meta {
                font-size: 0.8rem;
                gap: var(--spacing-xs);
            }
            
            .article-meta .divider {
                height: 14px;
            }
            
            .article-content {
                border-radius: var(--radius-lg);
                padding: var(--spacing-sm);
            }
            
            .article-content h1 {
                font-size: 1.5rem;
            }
            
            .article-content h2 {
                font-size: 1.3rem;
            }
            
            .article-cta {
                padding: var(--spacing-md);
                border-radius: var(--radius-lg);
            }
            
            .article-cta h2 {
                font-size: 1.3rem;
            }
            
            .btn-cta-primary {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
            
            .fab-left {
                width: 48px;
                height: 48px;
                left: 12px;
                bottom: 80px;
                font-size: 1rem;
            }
            
            .site-footer {
                padding: var(--spacing-lg) 0 var(--spacing-sm);
            }
            
            .footer-brand {
                font-size: 1.1rem;
            }
        }
        
        @media (max-width: 520px) {
            .article-title {
                font-size: 1.3rem;
            }
            
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 4px;
            }
            
            .article-meta .divider {
                display: none;
            }
            
            .article-content {
                font-size: 0.95rem;
                line-height: 1.6;
            }
            
            .article-content h1 {
                font-size: 1.3rem;
            }
            
            .article-content h2 {
                font-size: 1.15rem;
            }
            
            .article-content h3 {
                font-size: 1.05rem;
            }
            
            .btn-login {
                padding: 6px 12px;
                font-size: 0.85rem;
            }
            
            .btn-signup {
                padding: 8px 16px;
                font-size: 0.85rem;
            }
        }

/* roulang page: category1 */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-dark: #1E293B;
            --border-glow: rgba(0, 240, 255, 0.3);
            --shadow-neon: 0 0 20px rgba(0, 240, 255, 0.2);
            --shadow-blue: 0 0 30px rgba(0, 82, 255, 0.25);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 32px;
            --spacing-lg: 56px;
            --spacing-xl: 80px;
            --font-body: 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
            --font-display: 'Segoe UI', 'Roboto', system-ui, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s ease;
        }

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

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

        body {
            font-family: var(--font-body);
            background-color: var(--primary-bg);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
            min-height: 100vh;
            position: relative;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(ellipse at 20% 10%, rgba(0, 82, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 90%, rgba(0, 240, 255, 0.06) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 50%, rgba(13, 17, 30, 0.5) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }

        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
            position: relative;
            z-index: 1;
        }

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

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

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

        button, .btn {
            transition: all var(--transition-base);
            cursor: pointer;
        }

        button:focus, .btn:focus, a:focus, input:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        /* ============ HEADER & NAVIGATION ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: all var(--transition-base);
        }

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

        .navbar {
            padding: 16px 0;
            min-height: 72px;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 700;
            font-size: 1.15rem;
            color: var(--text-white) !important;
            letter-spacing: -0.3px;
            line-height: 1.3;
            max-width: 280px;
        }

        .navbar-brand:hover {
            color: var(--accent-cyan) !important;
        }

        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border-radius: 12px;
            font-size: 1.1rem;
            color: white;
            flex-shrink: 0;
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
        }

        .navbar-nav {
            gap: 4px;
        }

        .nav-link {
            color: var(--text-silver) !important;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 16px !important;
            border-radius: 20px;
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--accent-cyan) !important;
            background: rgba(0, 240, 255, 0.08);
        }

        .nav-link.active {
            color: var(--accent-cyan) !important;
            background: rgba(0, 240, 255, 0.12);
            font-weight: 600;
        }

        .btn-login {
            color: var(--text-silver);
            font-weight: 500;
            font-size: 0.9rem;
            padding: 8px 16px;
            border: 1px solid transparent;
            border-radius: 20px;
            transition: all var(--transition-fast);
            white-space: nowrap;
            background: transparent;
            display: inline-flex;
            align-items: center;
        }

        .btn-login:hover {
            color: var(--accent-cyan);
            border-color: rgba(0, 240, 255, 0.3);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: white !important;
            font-weight: 600;
            font-size: 0.9rem;
            padding: 8px 20px;
            border-radius: 20px;
            border: none;
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.35);
            white-space: nowrap;
            transition: all var(--transition-base);
            display: inline-flex;
            align-items: center;
        }

        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 25px rgba(0, 240, 255, 0.45);
            color: white !important;
        }

        .navbar-toggler {
            border: 1px solid rgba(0, 240, 255, 0.3);
            padding: 8px 12px;
            border-radius: 8px;
            background: rgba(0, 240, 255, 0.05);
        }

        .navbar-toggler:focus {
            box-shadow: none;
            border-color: var(--accent-cyan);
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 240, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* ============ PAGE BANNER ============ */
        .page-banner {
            padding: 80px 0 48px;
            position: relative;
            overflow: hidden;
        }

        .page-banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(ellipse at 30% 20%, rgba(0, 82, 255, 0.15) 0%, transparent 55%),
                radial-gradient(ellipse at 70% 60%, rgba(0, 240, 255, 0.1) 0%, transparent 55%);
            pointer-events: none;
        }

        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }

        .breadcrumb-nav a {
            color: var(--text-silver);
            transition: color var(--transition-fast);
        }

        .breadcrumb-nav a:hover {
            color: var(--accent-cyan);
        }

        .breadcrumb-nav .separator {
            color: var(--text-muted);
            font-size: 0.7rem;
        }

        .breadcrumb-nav .current {
            color: var(--accent-cyan);
            font-weight: 500;
        }

        .page-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -1px;
            line-height: 1.2;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #FFFFFF 0%, #CBD5E1 50%, #00F0FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .page-banner .banner-desc {
            font-size: 1.1rem;
            color: var(--text-silver);
            max-width: 720px;
            line-height: 1.7;
        }

        /* ============ MAIN SECTIONS ============ */
        .section {
            padding: 56px 0;
            position: relative;
        }

        .section-alt {
            background: rgba(13, 17, 30, 0.5);
            border-top: 1px solid var(--border-dark);
            border-bottom: 1px solid var(--border-dark);
        }

        .section-title {
            font-size: 1.9rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
            color: var(--text-white);
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 40px;
            max-width: 680px;
        }

        /* ============ DOWNLOAD FEATURE GRID ============ */
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            margin-top: 24px;
        }

        .download-card {
            background: rgba(13, 17, 30, 0.8);
            border: 1px solid rgba(0, 240, 255, 0.15);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }

        .download-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            opacity: 0;
            transition: opacity var(--transition-base);
        }

        .download-card:hover {
            border-color: rgba(0, 240, 255, 0.4);
            transform: translateY(-4px);
            box-shadow: var(--shadow-neon);
        }

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

        .download-card .icon-wrapper {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            background: rgba(0, 240, 255, 0.1);
            border-radius: 16px;
            margin-bottom: 16px;
            font-size: 1.4rem;
            color: var(--accent-cyan);
        }

        .download-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-white);
        }

        .download-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* ============ STEP FLOW ============ */
        .step-flow {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
            margin-top: 32px;
            counter-reset: step;
        }

        .step-item {
            position: relative;
            padding: 24px;
            background: rgba(13, 17, 30, 0.6);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-dark);
            transition: all var(--transition-base);
        }

        .step-item:hover {
            border-color: rgba(0, 240, 255, 0.3);
            box-shadow: var(--shadow-neon);
        }

        .step-item::before {
            counter-increment: step;
            content: counter(step, decimal-leading-zero);
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 2.5rem;
            font-weight: 800;
            color: rgba(0, 240, 255, 0.15);
            line-height: 1;
            letter-spacing: -2px;
        }

        .step-item .step-icon {
            font-size: 1.5rem;
            color: var(--accent-cyan);
            margin-bottom: 12px;
        }

        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-white);
        }

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

        /* ============ FEATURE SHOWCASE ============ */
        .feature-showcase {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .feature-showcase .feature-image {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid rgba(0, 240, 255, 0.2);
            box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
        }

        .feature-showcase .feature-image img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .feature-showcase .feature-image:hover img {
            transform: scale(1.03);
        }

        .feature-showcase .feature-image::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(180deg, rgba(8,9,15,0.1) 0%, rgba(8,9,15,0.4) 100%);
            pointer-events: none;
        }

        .feature-showcase .feature-content h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }

        .feature-showcase .feature-content p {
            font-size: 0.98rem;
            color: var(--text-silver);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .feature-list {
            list-style: none;
            padding: 0;
            margin: 20px 0 0;
        }

        .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 0;
            font-size: 0.92rem;
            color: var(--text-silver);
            line-height: 1.6;
        }

        .feature-list li i {
            color: var(--accent-cyan);
            font-size: 1rem;
            margin-top: 4px;
            flex-shrink: 0;
        }

        /* ============ STATS BAR ============ */
        .stats-bar {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 24px;
            padding: 32px 0;
        }

        .stat-item {
            text-align: left;
            padding: 20px 24px;
            background: rgba(13, 17, 30, 0.7);
            border-radius: var(--radius-md);
            border-left: 3px solid var(--accent-cyan);
            transition: all var(--transition-base);
        }

        .stat-item:hover {
            background: rgba(13, 17, 30, 0.9);
            box-shadow: var(--shadow-neon);
        }

        .stat-item .stat-value {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-cyan);
            letter-spacing: -1px;
            line-height: 1;
            margin-bottom: 8px;
        }

        .stat-item .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* ============ DEVICE SUPPORT ============ */
        .device-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
            margin-top: 24px;
        }

        .device-card {
            background: rgba(13, 17, 30, 0.7);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all var(--transition-base);
            text-align: left;
        }

        .device-card:hover {
            border-color: rgba(0, 240, 255, 0.35);
            transform: translateY(-3px);
            box-shadow: var(--shadow-neon);
        }

        .device-card .device-icon {
            font-size: 2rem;
            color: var(--accent-cyan);
            margin-bottom: 16px;
        }

        .device-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-white);
        }

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

        .device-card .device-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 16px;
        }

        .device-card .device-tags span {
            font-size: 0.75rem;
            padding: 4px 12px;
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid rgba(0, 240, 255, 0.2);
            border-radius: 20px;
            color: var(--text-silver);
            font-weight: 500;
        }

        /* ============ FAQ ============ */
        .faq-list {
            margin-top: 24px;
        }

        .accordion-item {
            background: rgba(13, 17, 30, 0.7);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-sm) !important;
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .accordion-item:hover {
            border-color: rgba(0, 240, 255, 0.3);
        }

        .accordion-button {
            background: transparent !important;
            color: var(--text-white) !important;
            font-weight: 600;
            font-size: 0.98rem;
            padding: 18px 20px;
            box-shadow: none !important;
            transition: all var(--transition-fast);
        }

        .accordion-button:not(.collapsed) {
            color: var(--accent-cyan) !important;
            background: rgba(0, 240, 255, 0.05) !important;
        }

        .accordion-button:focus {
            box-shadow: none !important;
            border-color: var(--accent-cyan);
        }

        .accordion-button::after {
            filter: invert(80%) sepia(50%) saturate(500%) hue-rotate(140deg);
        }

        .accordion-body {
            color: var(--text-silver);
            font-size: 0.92rem;
            line-height: 1.7;
            padding: 16px 20px 20px;
        }

        /* ============ CTA SECTION ============ */
        .cta-section {
            padding: 64px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(ellipse at 50% 50%, rgba(0, 82, 255, 0.2) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 20%, rgba(0, 240, 255, 0.1) 0%, transparent 50%);
            pointer-events: none;
        }

        .cta-box {
            background: rgba(13, 17, 30, 0.9);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            text-align: center;
            position: relative;
            box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
        }

        .cta-box h2 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
            color: var(--text-white);
        }

        .cta-box p {
            font-size: 1rem;
            color: var(--text-silver);
            line-height: 1.7;
            margin-bottom: 28px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn-cta-primary {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: white !important;
            font-weight: 700;
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: 30px;
            border: none;
            box-shadow: 0 4px 20px rgba(0, 82, 255, 0.4);
            transition: all var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-cta-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(0, 240, 255, 0.5);
            color: white !important;
        }

        .btn-cta-secondary {
            background: transparent;
            color: var(--accent-cyan) !important;
            font-weight: 600;
            font-size: 1rem;
            padding: 14px 28px;
            border-radius: 30px;
            border: 1px solid rgba(0, 240, 255, 0.4);
            transition: all var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-cta-secondary:hover {
            background: rgba(0, 240, 255, 0.1);
            border-color: var(--accent-cyan);
            transform: translateY(-2px);
        }

        /* ============ FAB ============ */
        .fab-float {
            position: fixed;
            left: 24px;
            bottom: 96px;
            z-index: 1050;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(8, 9, 15, 0.85), rgba(8, 9, 15, 0.85)), linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--accent-cyan);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
            transition: all var(--transition-base);
            opacity: 0.75;
            cursor: pointer;
            animation: fab-breathe 3s ease-in-out infinite;
        }

        .fab-float:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.7);
            color: white;
        }

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

        .fab-float .fab-dot {
            position: absolute;
            top: 4px;
            right: 4px;
            width: 12px;
            height: 12px;
            background: #FF007F;
            border-radius: 50%;
            border: 2px solid var(--primary-bg);
            animation: dot-blink 1.5s ease-in-out infinite;
        }

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

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

        /* ============ FOOTER ============ */
        .site-footer {
            background: rgba(8, 9, 15, 0.95);
            border-top: 1px solid rgba(0, 240, 255, 0.15);
            padding: 56px 0 24px;
            position: relative;
            z-index: 1;
        }

        .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }

        .footer-desc {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 16px;
        }

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

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

        .footer-links a {
            color: var(--text-silver);
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .footer-links a:hover {
            color: var(--accent-cyan);
            padding-left: 4px;
        }

        .footer-bottom {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid var(--border-dark);
            text-align: center;
        }

        .footer-bottom p {
            font-size: 0.82rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ============ RESPONSIVE ============ */
        @media (max-width: 1024px) {
            .feature-showcase {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .feature-showcase .feature-image img {
                height: 280px;
            }

            .page-banner h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .navbar {
                padding: 12px 0;
                min-height: 64px;
            }

            .navbar-brand {
                font-size: 1rem;
                max-width: 200px;
            }

            .brand-icon {
                width: 34px;
                height: 34px;
                font-size: 0.9rem;
            }

            .navbar-collapse {
                background: rgba(8, 9, 15, 0.98);
                border-radius: 16px;
                padding: 16px;
                margin-top: 12px;
                border: 1px solid rgba(0, 240, 255, 0.15);
            }

            .navbar-nav {
                gap: 2px;
            }

            .nav-link {
                padding: 10px 14px !important;
                font-size: 0.9rem;
            }

            .btn-login, .btn-signup {
                font-size: 0.82rem;
                padding: 6px 14px;
            }

            .page-banner {
                padding: 56px 0 32px;
            }

            .page-banner h1 {
                font-size: 1.8rem;
            }

            .page-banner .banner-desc {
                font-size: 0.98rem;
            }

            .section {
                padding: 40px 0;
            }

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

            .cta-box {
                padding: 32px 20px;
            }

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

            .fab-float {
                width: 48px;
                height: 48px;
                left: 16px;
                bottom: 80px;
                font-size: 1.1rem;
            }

            .step-flow {
                grid-template-columns: 1fr;
            }

            .stats-bar {
                grid-template-columns: 1fr 1fr;
            }

            .stat-item .stat-value {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

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

            .brand-icon {
                width: 30px;
                height: 30px;
                font-size: 0.8rem;
                border-radius: 8px;
            }

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

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

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

            .stats-bar {
                grid-template-columns: 1fr;
            }

            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }

            .btn-cta-primary, .btn-cta-secondary {
                width: 100%;
                justify-content: center;
            }

            .feature-showcase .feature-image img {
                height: 200px;
            }
        }

/* roulang page: category2 */
:root {
            --bg-deep: #0F0C20;
            --bg-ocean: #0B1A30;
            --bg-card: #16132A;
            --accent-lime: #CCFF00;
            --accent-cyan: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #A6ACAF;
            --text-muted: #7A8085;
            --border-glass: rgba(0, 240, 255, 0.18);
            --border-neon: rgba(204, 255, 0, 0.35);
            --radius-sm: 10px;
            --radius-md: 18px;
            --radius-lg: 26px;
            --shadow-neon: 0 0 18px rgba(0, 240, 255, 0.12);
            --shadow-lime: 0 0 22px rgba(204, 255, 0, 0.08);
            --spacing-section: 90px;
            --spacing-gap: 28px;
            --font-body: 'Inter', 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
        }

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

        body {
            font-family: var(--font-body);
            background: radial-gradient(ellipse at 20% 10%, rgba(15, 12, 32, 0.98) 0%, rgba(11, 26, 48, 0.96) 45%, #08070F 100%);
            color: var(--text-primary);
            line-height: 1.6;
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover {
            color: var(--accent-lime);
        }
        img {
            max-width: 100%;
            display: block;
        }
        button, input, textarea, select {
            font-family: inherit;
        }
        button:focus-visible, a:focus-visible, input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 3px;
            border-radius: 4px;
        }

        .container {
            max-width: 1220px;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(8, 7, 15, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.14);
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
        }
        .navbar {
            padding-top: 16px;
            padding-bottom: 16px;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.2rem;
            letter-spacing: 0.02em;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .navbar-brand:hover {
            color: var(--accent-cyan);
        }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.18), rgba(204, 255, 0, 0.14));
            border: 1px solid var(--border-glass);
            border-radius: 12px;
            color: var(--accent-cyan);
            font-size: 1.1rem;
        }
        .navbar-nav .nav-link {
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.95rem;
            padding: 8px 14px;
            margin: 0 4px;
            border-radius: 30px;
            transition: all 0.25s ease;
            position: relative;
        }
        .navbar-nav .nav-link:hover {
            color: var(--text-primary);
            background: rgba(0, 240, 255, 0.08);
        }
        .navbar-nav .nav-link.active {
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.12);
            border: 1px solid rgba(0, 240, 255, 0.2);
        }
        .btn-login {
            color: var(--text-primary);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 10px 18px;
            border-radius: 30px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: all 0.25s ease;
            background: transparent;
        }
        .btn-login:hover {
            color: var(--accent-cyan);
            border-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.06);
        }
        .btn-signup {
            background: linear-gradient(135deg, #CCFF00, #00F0FF);
            color: #08070F;
            font-weight: 800;
            font-size: 0.9rem;
            padding: 11px 22px;
            border-radius: 30px;
            border: none;
            box-shadow: 0 0 18px rgba(204, 255, 0, 0.3);
            transition: all 0.3s ease;
        }
        .btn-signup:hover {
            background: linear-gradient(135deg, #d9ff2e, #33f4ff);
            color: #08070F;
            transform: translateY(-2px);
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.45);
        }
        .navbar-toggler {
            border-color: rgba(0, 240, 255, 0.3);
            padding: 8px 12px;
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.25);
        }

        /* Hero / Banner */
        .page-banner {
            background: linear-gradient(135deg, rgba(15, 12, 32, 0.92), rgba(11, 26, 48, 0.88)), url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            border-bottom: 1px solid var(--border-glass);
            padding: 72px 0 60px;
            position: relative;
            overflow: hidden;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -15%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.14), transparent 70%);
            pointer-events: none;
        }
        .page-banner .banner-content {
            position: relative;
            z-index: 2;
        }
        .banner-tag {
            display: inline-block;
            background: rgba(204, 255, 0, 0.12);
            border: 1px solid rgba(204, 255, 0, 0.3);
            color: var(--accent-lime);
            font-size: 0.78rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            padding: 6px 16px;
            border-radius: 30px;
            text-transform: uppercase;
            margin-bottom: 22px;
        }
        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 18px;
            max-width: 780px;
            letter-spacing: -0.01em;
        }
        .page-banner .banner-desc {
            font-size: 1.12rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.65;
        }

        /* Section Base */
        .section-block {
            padding: var(--spacing-section) 0;
        }
        .section-block.alternate {
            background: rgba(11, 26, 48, 0.45);
            border-top: 1px solid rgba(0, 240, 255, 0.08);
            border-bottom: 1px solid rgba(0, 240, 255, 0.08);
        }
        .section-label {
            display: inline-block;
            font-size: 0.78rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 14px;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 18px;
            letter-spacing: -0.01em;
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.65;
        }

        /* Strategy Cards */
        .strategy-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            height: 100%;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-neon);
            position: relative;
            overflow: hidden;
        }
        .strategy-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-lime));
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .strategy-card:hover {
            transform: translateY(-6px);
            border-color: var(--border-neon);
            box-shadow: 0 0 32px rgba(0, 240, 255, 0.18);
        }
        .strategy-card:hover::before {
            opacity: 1;
        }
        .strategy-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: rgba(0, 240, 255, 0.35);
            margin-bottom: 12px;
            line-height: 1;
        }
        .strategy-card h3 {
            font-size: 1.22rem;
            font-weight: 700;
            margin-bottom: 12px;
            line-height: 1.35;
        }
        .strategy-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.65;
            margin-bottom: 0;
        }

        /* Feature Image Block */
        .feature-img-block {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-glass);
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.08);
            position: relative;
        }
        .feature-img-block img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .feature-img-block:hover img {
            transform: scale(1.04);
        }
        .feature-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 24px 20px;
            background: linear-gradient(transparent, rgba(8, 7, 15, 0.85));
            color: var(--text-primary);
        }
        .feature-overlay h4 {
            font-weight: 700;
            font-size: 1.05rem;
            margin-bottom: 6px;
        }
        .feature-overlay p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* Live Countdown Panel */
        .countdown-panel {
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.08), rgba(204, 255, 0, 0.05));
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 34px 30px;
            text-align: center;
        }
        .countdown-panel .live-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 0, 80, 0.15);
            border: 1px solid rgba(255, 0, 80, 0.4);
            color: #FF5070;
            font-size: 0.78rem;
            font-weight: 700;
            padding: 5px 14px;
            border-radius: 30px;
            letter-spacing: 0.05em;
        }
        .live-badge .pulse-dot {
            width: 8px;
            height: 8px;
            background: #FF5070;
            border-radius: 50%;
            animation: pulse-dot 1.2s infinite;
        }
        @keyframes pulse-dot {
            0%, 100% { box-shadow: 0 0 0 0 rgba(255, 80, 112, 0.7); }
            50% { box-shadow: 0 0 0 8px rgba(255, 80, 112, 0); }
        }
        .countdown-panel h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 16px 0 8px;
        }
        .countdown-panel .timer {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--accent-lime);
            letter-spacing: 0.08em;
            margin-bottom: 18px;
        }
        .btn-remind {
            background: linear-gradient(135deg, #CCFF00, #00F0FF);
            color: #08070F;
            font-weight: 800;
            padding: 13px 30px;
            border-radius: 40px;
            border: none;
            box-shadow: 0 0 22px rgba(204, 255, 0, 0.3);
            transition: all 0.3s ease;
        }
        .btn-remind:hover {
            background: linear-gradient(135deg, #d9ff2e, #33f4ff);
            color: #08070F;
            transform: translateY(-2px);
            box-shadow: 0 0 32px rgba(0, 240, 255, 0.5);
        }

        /* FAQ */
        .faq-list .accordion-item {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md) !important;
            margin-bottom: 14px;
            overflow: hidden;
        }
        .faq-list .accordion-button {
            background: transparent;
            color: var(--text-primary);
            font-weight: 700;
            font-size: 1rem;
            padding: 20px 24px;
            box-shadow: none;
            border-radius: var(--radius-md) !important;
        }
        .faq-list .accordion-button:not(.collapsed) {
            background: rgba(0, 240, 255, 0.06);
            color: var(--accent-cyan);
        }
        .faq-list .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.2);
        }
        .faq-list .accordion-body {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.65;
            padding: 0 24px 20px;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.1), rgba(204, 255, 0, 0.06));
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 54px 40px;
            text-align: center;
            box-shadow: 0 0 50px rgba(0, 240, 255, 0.1);
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 620px;
            margin: 0 auto 26px;
        }
        .btn-cta-primary {
            background: linear-gradient(135deg, #CCFF00, #00F0FF);
            color: #08070F;
            font-weight: 800;
            padding: 16px 38px;
            border-radius: 40px;
            border: none;
            box-shadow: 0 0 28px rgba(204, 255, 0, 0.35);
            transition: all 0.3s ease;
            font-size: 1rem;
        }
        .btn-cta-primary:hover {
            background: linear-gradient(135deg, #d9ff2e, #33f4ff);
            color: #08070F;
            transform: translateY(-3px);
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.55);
        }

        /* Footer */
        .site-footer {
            background: #08070F;
            border-top: 1px solid rgba(0, 240, 255, 0.12);
            padding: 60px 0 30px;
            margin-top: 30px;
        }
        .footer-brand {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .footer-desc {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.65;
            max-width: 420px;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: var(--text-secondary);
            font-size: 0.92rem;
            transition: all 0.25s ease;
        }
        .footer-links a:hover {
            color: var(--accent-cyan);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: 40px;
            padding-top: 24px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 1049;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 7, 15, 0.72);
            backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--accent-cyan);
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.35);
            cursor: pointer;
            transition: all 0.3s ease;
            animation: fab-breathe 3s infinite ease-in-out;
        }
        .fab-left:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 32px rgba(0, 240, 255, 0.7);
        }
        @keyframes fab-breathe {
            0%, 100% { opacity: 0.65; }
            50% { opacity: 1; }
        }
        .fab-left .notification-dot {
            position: absolute;
            top: 2px;
            right: 2px;
            width: 12px;
            height: 12px;
            background: #FF5070;
            border-radius: 50%;
            border: 2px solid #08070F;
            animation: pulse-dot 1.2s infinite;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --spacing-section: 64px;
            }
            .page-banner h1 {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.7rem;
            }
        }
        @media (max-width: 768px) {
            .navbar-brand {
                font-size: 1rem;
            }
            .page-banner {
                padding: 48px 0 40px;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .section-block {
                padding: 48px 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .countdown-panel .timer {
                font-size: 1.8rem;
            }
            .cta-section {
                padding: 36px 22px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .navbar {
                padding-top: 10px;
                padding-bottom: 10px;
            }
            .strategy-card {
                padding: 20px 16px;
            }
            .fab-left {
                width: 48px;
                height: 48px;
                left: 12px;
                bottom: 80px;
            }
        }