/* roulang page: index */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --card-bg: rgba(13, 17, 30, 0.7);
            --accent: #0052FF;
            --accent-cyan: #00F0FF;
            --text: #FFFFFF;
            --text-muted: #CBD5E1;
            --text-weak: #94A3B8;
            --border: rgba(0, 82, 255, 0.3);
            --border-glow: rgba(0, 240, 255, 0.4);
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 0 20px rgba(0, 82, 255, 0.15);
            --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.3);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
            background: var(--primary-bg);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

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

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

        button, .btn {
            cursor: pointer;
            font-family: inherit;
            transition: var(--transition);
            outline: none;
            border: none;
        }

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Navbar */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 82, 255, 0.2);
            transition: var(--transition);
        }

        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }

        .nav-logo {
            font-size: 1.25rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

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

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            position: relative;
            padding: 6px 0;
            transition: var(--transition);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width 0.3s ease;
            border-radius: 2px;
        }

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

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

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

        .btn-login {
            background: transparent;
            color: var(--text);
            border: 1px solid rgba(255, 255, 255, 0.25);
            padding: 10px 20px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
        }

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

        .btn-signup {
            background: linear-gradient(135deg, var(--accent), #0038cc);
            color: #fff;
            padding: 10px 22px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            box-shadow: 0 4px 18px rgba(0, 82, 255, 0.45);
            transition: var(--transition);
            border: 1px solid rgba(0, 240, 255, 0.4);
        }

        .btn-signup:hover {
            box-shadow: 0 6px 28px rgba(0, 240, 255, 0.6);
            transform: translateY(-1px);
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid rgba(0, 82, 255, 0.3);
            }
            .nav-links.open {
                display: flex;
            }
            .mobile-menu-toggle {
                display: block;
            }
            .nav-actions {
                gap: 8px;
            }
            .btn-login, .btn-signup {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
        }

        /* Hero */
        .hero-section {
            position: relative;
            padding: 140px 0 80px;
            background: url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            min-height: 85vh;
            display: flex;
            align-items: center;
            overflow: hidden;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(8,9,15,0.92) 0%, rgba(13,17,30,0.78) 100%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 450px;
            gap: 60px;
            align-items: center;
        }

        .hero-text h1 {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.03em;
            margin: 0 0 20px;
            background: linear-gradient(135deg, #FFFFFF 20%, var(--accent-cyan) 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-text p {
            font-size: 1.15rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin: 0 0 32px;
            max-width: 520px;
        }

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

        .btn-primary {
            background: var(--accent);
            color: #fff;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 0 25px rgba(0, 82, 255, 0.5);
            border: 1px solid rgba(0, 240, 255, 0.5);
            transition: var(--transition);
        }

        .btn-primary:hover {
            box-shadow: 0 0 38px rgba(0, 240, 255, 0.7);
            transform: translateY(-2px);
        }

        .btn-outline {
            background: transparent;
            color: var(--text);
            border: 1.5px solid rgba(255,255,255,0.45);
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            transition: var(--transition);
        }

        .btn-outline:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.35);
            color: var(--accent-cyan);
        }

        .hero-card {
            background: rgba(13, 17, 30, 0.7);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(0, 240, 255, 0.25);
            border-radius: var(--radius);
            padding: 32px 28px;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
            transition: var(--transition);
        }

        .hero-card:hover {
            border-color: rgba(0, 240, 255, 0.5);
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.15);
        }

        .hero-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin: 0 0 16px;
            color: var(--accent-cyan);
        }

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

        .hero-card ul li {
            padding: 8px 0;
            color: var(--text-muted);
            font-size: 0.95rem;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .hero-card ul li i {
            color: var(--accent-cyan);
        }

        @media (max-width: 1024px) {
            .hero-content {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-text p {
                margin-left: auto;
                margin-right: auto;
            }
            .hero-cta-group {
                justify-content: center;
            }
            .hero-card {
                max-width: 500px;
                margin: 0 auto;
            }
        }

        @media (max-width: 640px) {
            .hero-text h1 {
                font-size: 2rem;
            }
            .hero-section {
                padding: 110px 0 50px;
                min-height: auto;
            }
        }

        /* Section Styles */
        section {
            padding: 80px 0;
            position: relative;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 12px;
            background: rgba(0, 240, 255, 0.12);
            padding: 6px 16px;
            border-radius: 50px;
        }

        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            margin: 0 0 16px;
            letter-spacing: -0.02em;
        }

        .section-desc {
            color: var(--text-muted);
            font-size: 1.05rem;
            margin: 0 0 40px;
            max-width: 640px;
            line-height: 1.7;
        }

        @media (max-width: 640px) {
            .section-title {
                font-size: 1.6rem;
            }
            section {
                padding: 50px 0;
            }
        }

        /* Brand Story */
        .brand-story-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .brand-story-image {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.15);
            border: 1px solid rgba(0, 240, 255, 0.2);
        }

        .brand-story-text h2 {
            font-size: 2rem;
            font-weight: 800;
        }

        @media (max-width: 768px) {
            .brand-story-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }

        /* Featured Cards */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .featured-card {
            background: var(--card-bg);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(0, 82, 255, 0.3);
            border-radius: var(--radius);
            padding: 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .featured-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.2);
            transform: translateY(-4px);
        }

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

        .featured-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin: 0 0 10px;
        }

        .featured-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin: 0;
            line-height: 1.6;
        }

        /* Testimonial Bubbles */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
        }

        .testimonial-bubble {
            background: rgba(13, 17, 30, 0.6);
            border: 1px solid rgba(0, 240, 255, 0.15);
            border-radius: var(--radius);
            padding: 24px;
            position: relative;
        }

        .testimonial-bubble::before {
            content: '\201C';
            font-size: 3rem;
            color: var(--accent-cyan);
            opacity: 0.4;
            position: absolute;
            top: 8px;
            left: 16px;
        }

        .testimonial-bubble p {
            color: var(--text-muted);
            font-style: italic;
            line-height: 1.6;
        }

        .testimonial-author {
            font-weight: 700;
            color: var(--text);
            margin-top: 12px;
        }

        /* News Section */
        .news-list {
            list-style: none;
            padding: 0;
            margin: 0;
            border-top: 1px solid rgba(0, 240, 255, 0.15);
        }

        .news-list li {
            border-bottom: 1px solid rgba(0, 240, 255, 0.1);
            padding: 16px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        .news-list a {
            color: var(--text);
            font-weight: 600;
            transition: var(--transition);
        }

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

        .news-meta {
            color: var(--text-weak);
            font-size: 0.85rem;
            white-space: nowrap;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.15), rgba(0, 240, 255, 0.08));
            border-top: 1px solid rgba(0, 240, 255, 0.25);
            border-bottom: 1px solid rgba(0, 240, 255, 0.25);
            text-align: center;
        }

        /* Milestone */
        .milestone-track {
            display: flex;
            gap: 20px;
            overflow-x: auto;
            padding: 10px 0 20px;
        }

        .milestone-item {
            flex: 0 0 200px;
            background: var(--card-bg);
            border: 1px solid rgba(0, 82, 255, 0.3);
            border-radius: var(--radius);
            padding: 20px;
            text-align: center;
        }

        .milestone-year {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-cyan);
        }

        /* Hot List */
        .hot-list {
            list-style: none;
            padding: 0;
            counter-reset: hot;
        }

        .hot-list li {
            counter-increment: hot;
            padding: 16px 0;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .hot-list li::before {
            content: '#' counter(hot);
            font-weight: 800;
            color: var(--accent-cyan);
            font-size: 1.3rem;
            min-width: 45px;
        }

        /* Footer */
        .site-footer {
            background: var(--secondary-bg);
            border-top: 1px solid rgba(0, 82, 255, 0.25);
            padding: 48px 0 24px;
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand {
            font-weight: 700;
            font-size: 1.2rem;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

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

        .footer-links li {
            margin: 8px 0;
        }

        .footer-links a {
            color: var(--text-weak);
            transition: var(--transition);
        }

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

        .footer-bottom {
            text-align: center;
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 20px;
            color: var(--text-weak);
            font-size: 0.8rem;
        }

        /* FAB */
        .floating-fab {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50px;
            background: rgba(8,9,15,0.75);
            backdrop-filter: blur(18px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.4rem;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.45);
            transition: var(--transition);
            cursor: pointer;
            animation: fabPulse 2.5s ease-in-out infinite;
        }

        .floating-fab:hover {
            box-shadow: 0 0 32px rgba(0, 240, 255, 0.8);
            transform: scale(1.08);
            color: #fff;
        }

        @keyframes fabPulse {
            0%, 100% { opacity: 0.75; }
            50% { opacity: 1; }
        }

/* roulang page: article */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --card-bg: rgba(13, 17, 30, 0.7);
            --accent: #0052FF;
            --accent-cyan: #00F0FF;
            --text: #FFFFFF;
            --text-muted: #CBD5E1;
            --text-weak: #94A3B8;
            --border: rgba(0, 82, 255, 0.3);
            --border-glow: rgba(0, 240, 255, 0.4);
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 0 20px rgba(0, 82, 255, 0.15);
            --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.3);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
            background: var(--primary-bg);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        
        button, .btn {
            cursor: pointer;
            font-family: inherit;
            transition: var(--transition);
            outline: none;
            border: none;
        }
        
        button:focus-visible, a:focus-visible, .btn:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        
        /* Navbar */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 82, 255, 0.2);
            transition: var(--transition);
        }
        
        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }
        
        .nav-logo {
            font-size: 1.25rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }
        
        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        
        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            position: relative;
            padding: 6px 0;
            transition: var(--transition);
        }
        
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width 0.3s ease;
            border-radius: 2px;
        }
        
        .nav-links a:hover, .nav-links a.active {
            color: var(--text);
        }
        
        .nav-links a:hover::after, .nav-links a.active::after {
            width: 100%;
        }
        
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .btn-login {
            background: transparent;
            color: var(--text);
            border: 1px solid rgba(255, 255, 255, 0.25);
            padding: 10px 20px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
        }
        
        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
        }
        
        .btn-signup {
            background: linear-gradient(135deg, var(--accent), #0038cc);
            color: #fff;
            padding: 10px 22px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            box-shadow: 0 4px 18px rgba(0, 82, 255, 0.45);
            transition: var(--transition);
            border: 1px solid rgba(0, 240, 255, 0.4);
        }
        
        .btn-signup:hover {
            box-shadow: 0 6px 28px rgba(0, 240, 255, 0.6);
            transform: translateY(-1px);
        }
        
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
        }
        
        /* Article Hero */
        .article-hero {
            position: relative;
            padding: 120px 0 60px;
            background: url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            min-height: 50vh;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        
        .article-hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(8,9,15,0.93) 0%, rgba(13,17,30,0.82) 100%);
            z-index: 1;
        }
        
        .article-hero-content {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        
        .article-category-tag {
            display: inline-block;
            padding: 6px 18px;
            background: rgba(0, 82, 255, 0.25);
            border: 1px solid var(--border);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-cyan);
            margin-bottom: 16px;
            backdrop-filter: blur(10px);
        }
        
        .article-title {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #FFFFFF 0%, #CBD5E1 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .article-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            color: var(--text-weak);
            font-size: 0.95rem;
            flex-wrap: wrap;
        }
        
        .article-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        
        .article-meta i {
            color: var(--accent-cyan);
        }
        
        /* Article Content */
        .article-content-section {
            padding: 60px 0;
            background: var(--primary-bg);
        }
        
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
            align-items: start;
        }
        
        .article-body {
            background: var(--card-bg);
            backdrop-filter: blur(15px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 40px;
            position: relative;
            overflow: hidden;
        }
        
        .article-body::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--accent-cyan));
        }
        
        .article-body h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin: 32px 0 16px;
            color: var(--text);
            border-left: 3px solid var(--accent-cyan);
            padding-left: 16px;
        }
        
        .article-body h3 {
            font-size: 1.4rem;
            font-weight: 600;
            margin: 24px 0 12px;
            color: var(--text-muted);
        }
        
        .article-body p {
            color: var(--text-muted);
            line-height: 1.8;
            margin-bottom: 16px;
            font-size: 1rem;
        }
        
        .article-body ul, .article-body ol {
            color: var(--text-muted);
            line-height: 1.8;
            margin: 16px 0;
            padding-left: 24px;
        }
        
        .article-body li {
            margin-bottom: 8px;
        }
        
        .article-body img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            border: 1px solid var(--border);
        }
        
        .article-body blockquote {
            border-left: 3px solid var(--accent);
            padding: 16px 20px;
            margin: 24px 0;
            background: rgba(0, 82, 255, 0.08);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-muted);
            font-style: italic;
        }
        
        .sidebar-card {
            background: var(--card-bg);
            backdrop-filter: blur(15px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px;
            position: sticky;
            top: 100px;
        }
        
        .sidebar-card h4 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .sidebar-card h4 i {
            color: var(--accent-cyan);
        }
        
        .related-post-item {
            display: flex;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }
        
        .related-post-item:last-child {
            border-bottom: none;
        }
        
        .related-post-item:hover {
            transform: translateX(4px);
        }
        
        .related-post-thumb {
            width: 60px;
            height: 60px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            border: 1px solid var(--border);
        }
        
        .related-post-info h5 {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 4px;
            line-height: 1.3;
        }
        
        .related-post-info span {
            font-size: 0.8rem;
            color: var(--text-weak);
        }
        
        .cta-banner {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.2), rgba(0, 240, 255, 0.1));
            border: 1px solid var(--border-glow);
            border-radius: var(--radius);
            padding: 28px;
            text-align: center;
            margin-top: 20px;
        }
        
        .cta-banner p {
            color: var(--text-muted);
            margin-bottom: 16px;
            font-size: 0.95rem;
        }
        
        .btn-cta {
            display: inline-block;
            background: linear-gradient(135deg, var(--accent), var(--accent-cyan));
            color: #fff;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.95rem;
            box-shadow: var(--shadow-glow);
            transition: var(--transition);
        }
        
        .btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(0, 240, 255, 0.5);
        }
        
        /* Article Footer */
        .article-footer-section {
            padding: 60px 0;
            background: var(--secondary-bg);
            border-top: 1px solid var(--border);
        }
        
        .article-footer-section h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 24px;
            color: var(--text);
        }
        
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        
        .related-card {
            background: var(--card-bg);
            backdrop-filter: blur(15px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: var(--transition);
        }
        
        .related-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }
        
        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        
        .related-card-info {
            padding: 20px;
        }
        
        .related-card-info h5 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        
        .related-card-info span {
            font-size: 0.85rem;
            color: var(--text-weak);
        }
        
        /* Footer */
        .site-footer {
            background: var(--secondary-bg);
            border-top: 1px solid var(--border);
            padding: 48px 0 24px;
        }
        
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 32px;
        }
        
        .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        
        .footer-links li {
            margin-bottom: 8px;
        }
        
        .footer-links a {
            color: var(--text-weak);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--accent-cyan);
        }
        
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            color: var(--text-weak);
            font-size: 0.85rem;
        }
        
        .not-found-container {
            text-align: center;
            padding: 80px 20px;
        }
        
        .not-found-container i {
            font-size: 4rem;
            color: var(--accent-cyan);
            margin-bottom: 20px;
        }
        
        .not-found-container h2 {
            font-size: 2rem;
            margin-bottom: 12px;
            color: var(--text);
        }
        
        .not-found-container p {
            color: var(--text-weak);
            margin-bottom: 24px;
        }
        
        .btn-back-home {
            display: inline-block;
            background: linear-gradient(135deg, var(--accent), var(--accent-cyan));
            color: #fff;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
        }
        
        .btn-back-home:hover {
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }
        
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            
            .sidebar-card {
                position: static;
            }
            
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid rgba(0, 82, 255, 0.3);
            }
            
            .nav-links.open {
                display: flex;
            }
            
            .mobile-menu-toggle {
                display: block;
            }
            
            .nav-actions {
                gap: 8px;
            }
            
            .btn-login, .btn-signup {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
            
            .article-title {
                font-size: 2rem;
            }
            
            .article-body {
                padding: 24px;
            }
            
            .related-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }
        
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            
            .article-title {
                font-size: 1.6rem;
            }
            
            .article-hero {
                padding: 100px 0 40px;
            }
            
            .article-body {
                padding: 20px;
            }
        }

/* roulang page: category1 */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --card-bg: rgba(13, 17, 30, 0.7);
            --accent: #0052FF;
            --accent-cyan: #00F0FF;
            --text: #FFFFFF;
            --text-muted: #CBD5E1;
            --text-weak: #94A3B8;
            --border: rgba(0, 82, 255, 0.3);
            --border-glow: rgba(0, 240, 255, 0.4);
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 0 20px rgba(0, 82, 255, 0.15);
            --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.3);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        * {
            box-sizing: border-box;
        }
        
        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
            background: var(--primary-bg);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        
        button, .btn {
            cursor: pointer;
            font-family: inherit;
            transition: var(--transition);
            outline: none;
            border: none;
        }
        
        button:focus-visible, a:focus-visible, .btn:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        
        /* Navbar */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 82, 255, 0.2);
            transition: var(--transition);
        }
        
        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }
        
        .nav-logo {
            font-size: 1.25rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }
        
        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        
        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            position: relative;
            padding: 6px 0;
            transition: var(--transition);
        }
        
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width 0.3s ease;
            border-radius: 2px;
        }
        
        .nav-links a:hover, .nav-links a.active {
            color: var(--text);
        }
        
        .nav-links a:hover::after, .nav-links a.active::after {
            width: 100%;
        }
        
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .btn-login {
            background: transparent;
            color: var(--text);
            border: 1px solid rgba(255, 255, 255, 0.25);
            padding: 10px 20px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
        }
        
        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
        }
        
        .btn-signup {
            background: linear-gradient(135deg, var(--accent), #0038cc);
            color: #fff;
            padding: 10px 22px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            box-shadow: 0 4px 18px rgba(0, 82, 255, 0.45);
            transition: var(--transition);
            border: 1px solid rgba(0, 240, 255, 0.4);
        }
        
        .btn-signup:hover {
            box-shadow: 0 6px 28px rgba(0, 240, 255, 0.6);
            transform: translateY(-1px);
        }
        
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
        }
        
        /* Page Banner */
        .page-banner {
            position: relative;
            padding: 140px 0 80px;
            background: url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            min-height: 55vh;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        
        .banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(8,9,15,0.95) 0%, rgba(13,17,30,0.82) 100%);
            z-index: 1;
        }
        
        .banner-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        
        .banner-badge {
            display: inline-block;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid var(--border-glow);
            color: var(--accent-cyan);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 20px;
            letter-spacing: 0.05em;
        }
        
        .banner-content h1 {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.15;
            margin: 0 0 20px 0;
            background: linear-gradient(135deg, #FFFFFF 0%, var(--accent-cyan) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .banner-content p {
            font-size: 1.15rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 32px;
        }
        
        .btn-cta {
            background: linear-gradient(135deg, var(--accent), #0038cc);
            color: #fff;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.05rem;
            box-shadow: 0 6px 24px rgba(0, 82, 255, 0.5);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border: 1px solid rgba(0, 240, 255, 0.4);
            transition: var(--transition);
        }
        
        .btn-cta:hover {
            box-shadow: 0 8px 36px rgba(0, 240, 255, 0.7);
            transform: translateY(-2px);
        }
        
        /* Sections */
        .section {
            padding: 80px 0;
        }
        
        .section-dark {
            background: var(--secondary-bg);
        }
        
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text);
            letter-spacing: -0.03em;
        }
        
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-weak);
            margin-bottom: 48px;
            line-height: 1.7;
            max-width: 650px;
        }
        
        /* Glass Cards */
        .glass-card {
            background: var(--card-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px;
            transition: var(--transition);
        }
        
        .glass-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }
        
        /* Step Cards */
        .step-number {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, var(--accent), var(--accent-cyan));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.3rem;
            color: #fff;
            margin-bottom: 20px;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.5);
        }
        
        .step-card {
            background: var(--card-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 36px;
            transition: var(--transition);
            position: relative;
        }
        
        .step-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-glow);
            transform: translateX(8px);
        }
        
        /* Feature List */
        .feature-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            padding: 20px 0;
            border-bottom: 1px solid rgba(0, 82, 255, 0.15);
        }
        
        .feature-item:last-child {
            border-bottom: none;
        }
        
        .feature-icon {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            background: rgba(0, 240, 255, 0.1);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.1rem;
        }
        
        /* FAQ */
        .faq-item {
            background: var(--card-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 16px;
            overflow: hidden;
            transition: var(--transition);
        }
        
        .faq-item:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow);
        }
        
        .faq-question {
            padding: 24px 32px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text);
            user-select: none;
        }
        
        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--accent-cyan);
        }
        
        .faq-answer {
            padding: 0 32px 24px;
            color: var(--text-muted);
            line-height: 1.7;
            display: none;
        }
        
        .faq-item.open .faq-answer {
            display: block;
        }
        
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        
        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.15) 0%, rgba(0, 240, 255, 0.08) 100%);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 60px 48px;
            text-align: center;
        }
        
        /* Footer */
        .site-footer {
            background: var(--secondary-bg);
            padding: 60px 0 30px;
            border-top: 1px solid var(--border);
        }
        
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 40px;
        }
        
        .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: var(--text-weak);
            font-size: 0.95rem;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--accent-cyan);
        }
        
        .footer-bottom {
            border-top: 1px solid rgba(0, 82, 255, 0.15);
            padding-top: 20px;
            text-align: center;
            color: var(--text-weak);
            font-size: 0.9rem;
        }
        
        /* Responsive */
        @media (max-width: 1024px) {
            .banner-content h1 {
                font-size: 2.5rem;
            }
            
            .section-title {
                font-size: 1.8rem;
            }
            
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid rgba(0, 82, 255, 0.3);
            }
            
            .nav-links.open {
                display: flex;
            }
            
            .mobile-menu-toggle {
                display: block;
            }
            
            .nav-actions {
                gap: 8px;
            }
            
            .btn-login, .btn-signup {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
            
            .banner-content h1 {
                font-size: 2rem;
            }
            
            .banner-content p {
                font-size: 1rem;
            }
            
            .section {
                padding: 60px 0;
            }
            
            .section-title {
                font-size: 1.6rem;
            }
            
            .cta-section {
                padding: 40px 24px;
            }
            
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            
            .glass-card, .step-card {
                padding: 24px;
            }
            
            .faq-question {
                padding: 20px 24px;
                font-size: 0.95rem;
            }
            
            .faq-answer {
                padding: 0 24px 20px;
            }
        }
        
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            
            .banner-content h1 {
                font-size: 1.7rem;
            }
            
            .btn-cta {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
            
            .section-title {
                font-size: 1.4rem;
            }
            
            .step-card:hover {
                transform: translateX(4px);
            }
        }

/* roulang page: category2 */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --card-bg: rgba(13, 17, 30, 0.7);
            --accent: #0052FF;
            --accent-cyan: #00F0FF;
            --text: #FFFFFF;
            --text-muted: #CBD5E1;
            --text-weak: #94A3B8;
            --border: rgba(0, 82, 255, 0.3);
            --border-glow: rgba(0, 240, 255, 0.4);
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 0 20px rgba(0, 82, 255, 0.15);
            --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.3);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
            background: var(--primary-bg);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

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

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

        button, .btn {
            cursor: pointer;
            font-family: inherit;
            transition: var(--transition);
            outline: none;
            border: none;
        }

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Navbar */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 82, 255, 0.2);
            transition: var(--transition);
        }

        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }

        .nav-logo {
            font-size: 1.25rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

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

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            position: relative;
            padding: 6px 0;
            transition: var(--transition);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width 0.3s ease;
            border-radius: 2px;
        }

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

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

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

        .btn-login {
            background: transparent;
            color: var(--text);
            border: 1px solid rgba(255, 255, 255, 0.25);
            padding: 10px 20px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
        }

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

        .btn-signup {
            background: linear-gradient(135deg, var(--accent), #0038cc);
            color: #fff;
            padding: 10px 22px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            box-shadow: 0 4px 18px rgba(0, 82, 255, 0.45);
            transition: var(--transition);
            border: 1px solid rgba(0, 240, 255, 0.4);
        }

        .btn-signup:hover {
            box-shadow: 0 6px 28px rgba(0, 240, 255, 0.6);
            transform: translateY(-1px);
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
        }

        /* Hero Category */
        .hero-cat {
            position: relative;
            padding: 160px 0 80px;
            background: url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            min-height: 70vh;
            display: flex;
            align-items: center;
            overflow: hidden;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(8,9,15,0.92) 0%, rgba(13,17,30,0.78) 100%);
            z-index: 1;
        }

        .hero-cat-content {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .hero-cat-text h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.15;
            margin: 0 0 20px;
            background: linear-gradient(135deg, #fff, var(--accent-cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-cat-text p {
            font-size: 1.15rem;
            color: var(--text-muted);
            margin-bottom: 32px;
            line-height: 1.7;
        }

        .hero-cat-image {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-glow);
        }

        .hero-cat-image img {
            width: 100%;
            object-fit: cover;
            aspect-ratio: 4/3;
        }

        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--accent), #0038cc);
            color: #fff;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.05rem;
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.5);
            transition: var(--transition);
            border: 1px solid rgba(0, 240, 255, 0.4);
        }

        .btn-cta:hover {
            box-shadow: 0 8px 35px rgba(0, 240, 255, 0.7);
            transform: translateY(-2px);
        }

        /* Section Styles */
        .section {
            padding: 90px 0;
        }

        .section-header {
            max-width: 720px;
            margin-bottom: 48px;
        }

        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--text);
            margin: 0 0 16px;
        }

        .section-header p {
            font-size: 1.1rem;
            color: var(--text-muted);
            line-height: 1.65;
        }

        /* Pain Points - Asymmetric Grid */
        .pain-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: start;
        }

        .pain-item {
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px;
            transition: var(--transition);
        }

        .pain-item:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }

        .pain-item h3 {
            font-size: 1.35rem;
            font-weight: 700;
            margin: 0 0 12px;
            color: var(--accent-cyan);
        }

        .pain-item p {
            color: var(--text-muted);
            line-height: 1.65;
            margin: 0;
        }

        /* Solution Steps */
        .steps-container {
            display: flex;
            flex-direction: column;
            gap: 40px;
        }

        .step-block {
            display: grid;
            grid-template-columns: 80px 1fr 200px;
            gap: 30px;
            align-items: start;
            padding: 28px;
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            transition: var(--transition);
        }

        .step-block:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow);
        }

        .step-number {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), #0038cc);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.5);
        }

        .step-info h4 {
            font-size: 1.3rem;
            font-weight: 700;
            margin: 0 0 8px;
            color: var(--text);
        }

        .step-info p {
            color: var(--text-muted);
            line-height: 1.65;
            margin: 0;
        }

        .step-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.5rem;
            color: var(--accent-cyan);
            opacity: 0.7;
        }

        /* Benefit Cards */
        .benefit-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .benefit-card {
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 30px;
            text-align: left;
            transition: var(--transition);
        }

        .benefit-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-glow);
        }

        .benefit-card i {
            font-size: 2.2rem;
            color: var(--accent-cyan);
            margin-bottom: 16px;
        }

        .benefit-card h4 {
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0 0 10px;
            color: var(--text);
        }

        .benefit-card p {
            color: var(--text-muted);
            line-height: 1.6;
            margin: 0;
        }

        /* Testimonials */
        .testimonial-highlight {
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius);
            padding: 48px;
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            box-shadow: var(--shadow-glow);
        }

        .testimonial-highlight blockquote {
            font-size: 1.35rem;
            font-style: italic;
            line-height: 1.7;
            color: var(--text-muted);
            margin: 0 0 24px;
            position: relative;
            padding-left: 28px;
            border-left: 4px solid var(--accent-cyan);
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .testimonial-author i {
            font-size: 2.5rem;
            color: var(--accent-cyan);
        }

        .testimonial-author strong {
            font-size: 1.05rem;
            color: var(--text);
        }

        .testimonial-author span {
            font-size: 0.9rem;
            color: var(--text-weak);
        }

        /* CTA Banner */
        .cta-banner {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.15), rgba(0, 240, 255, 0.08));
            border: 1px solid var(--border-glow);
            border-radius: var(--radius);
            padding: 60px;
            text-align: left;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 30px;
        }

        .cta-banner h3 {
            font-size: 2rem;
            font-weight: 700;
            margin: 0;
            color: var(--text);
        }

        .cta-banner p {
            color: var(--text-muted);
            margin: 0;
            font-size: 1.05rem;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            max-width: 800px;
        }

        .faq-item {
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 24px 28px;
            transition: var(--transition);
            cursor: pointer;
        }

        .faq-item:hover {
            border-color: var(--accent-cyan);
        }

        .faq-question {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--text);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-answer {
            margin-top: 14px;
            color: var(--text-muted);
            line-height: 1.65;
            display: none;
        }

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

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

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

        .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

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

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

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

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

        .footer-bottom {
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            text-align: center;
            color: var(--text-weak);
            font-size: 0.9rem;
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 20px;
            bottom: 80px;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50px;
            background: rgba(0, 0, 0, 0.65);
            backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(0,0,0,0.65), rgba(0,0,0,0.65)), linear-gradient(135deg, #00F0FF, #0052FF);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #00F0FF;
            font-size: 1.5rem;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            transition: all 0.3s ease;
            cursor: pointer;
            animation: floatFab 3s ease-in-out infinite;
        }

        .fab-left:hover {
            transform: scale(1.15);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.8);
        }

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

        /* Responsive */
        @media (max-width: 1024px) {
            .hero-cat-content {
                grid-template-columns: 1fr;
            }
            .hero-cat-image {
                order: -1;
                max-width: 500px;
                margin: 0 auto;
            }
            .benefit-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .step-block {
                grid-template-columns: 70px 1fr 120px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid rgba(0, 82, 255, 0.3);
            }
            .nav-links.open {
                display: flex;
            }
            .mobile-menu-toggle {
                display: block;
            }
            .hero-cat-text h1 {
                font-size: 2rem;
            }
            .pain-grid {
                grid-template-columns: 1fr;
            }
            .benefit-grid {
                grid-template-columns: 1fr;
            }
            .step-block {
                grid-template-columns: 1fr;
            }
            .step-number {
                margin-bottom: 10px;
            }
            .step-icon {
                display: none;
            }
            .cta-banner {
                flex-direction: column;
                text-align: left;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero-cat {
                padding: 120px 0 50px;
                min-height: auto;
            }
            .hero-cat-text h1 {
                font-size: 1.6rem;
            }
            .btn-cta {
                width: 100%;
                justify-content: center;
            }
            .section {
                padding: 50px 0;
            }
        }

/* roulang page: category3 */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --card-bg: rgba(13, 17, 30, 0.7);
            --accent: #0052FF;
            --accent-cyan: #00F0FF;
            --text: #FFFFFF;
            --text-muted: #CBD5E1;
            --text-weak: #94A3B8;
            --border: rgba(0, 82, 255, 0.3);
            --border-glow: rgba(0, 240, 255, 0.4);
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 0 20px rgba(0, 82, 255, 0.15);
            --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.3);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
            background: var(--primary-bg);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        button, .btn {
            cursor: pointer;
            font-family: inherit;
            transition: var(--transition);
            outline: none;
            border: none;
        }
        button:focus-visible, a:focus-visible, .btn:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Navbar */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 82, 255, 0.2);
            transition: var(--transition);
        }
        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }
        .nav-logo {
            font-size: 1.25rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            position: relative;
            padding: 6px 0;
            transition: var(--transition);
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width 0.3s ease;
            border-radius: 2px;
        }
        .nav-links a:hover, .nav-links a.active {
            color: var(--text);
        }
        .nav-links a:hover::after, .nav-links a.active::after {
            width: 100%;
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .btn-login {
            background: transparent;
            color: var(--text);
            border: 1px solid rgba(255, 255, 255, 0.25);
            padding: 10px 20px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
        }
        .btn-signup {
            background: linear-gradient(135deg, var(--accent), #0038cc);
            color: #fff;
            padding: 10px 22px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            box-shadow: 0 4px 18px rgba(0, 82, 255, 0.45);
            transition: var(--transition);
            border: 1px solid rgba(0, 240, 255, 0.4);
        }
        .btn-signup:hover {
            box-shadow: 0 6px 28px rgba(0, 240, 255, 0.6);
            transform: translateY(-1px);
        }
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
        }

        /* Glassmorphism Cards */
        .glass-card {
            background: rgba(13, 17, 30, 0.65);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid rgba(0, 240, 255, 0.15);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .glass-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }

        /* Page Hero */
        .page-hero {
            position: relative;
            padding: 140px 0 80px;
            background: url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            min-height: 50vh;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(8,9,15,0.94) 0%, rgba(13,17,30,0.82) 100%);
            z-index: 1;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
        }

        /* Section Styles */
        .section-pad {
            padding: 80px 0;
        }
        .section-header {
            margin-bottom: 50px;
        }
        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            background: linear-gradient(135deg, var(--text), var(--text-muted));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-header p {
            color: var(--text-weak);
            font-size: 1.05rem;
            max-width: 700px;
            line-height: 1.7;
        }

        /* Tournament Card */
        .tournament-card {
            background: var(--card-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px 24px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .tournament-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--accent-cyan));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.4s ease;
        }
        .tournament-card:hover::before {
            transform: scaleX(1);
        }
        .tournament-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
        }

        /* Step Flow */
        .step-list {
            list-style: none;
            padding: 0;
            counter-reset: step;
        }
        .step-list li {
            counter-increment: step;
            position: relative;
            padding-left: 60px;
            margin-bottom: 40px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .step-list li::before {
            content: counter(step);
            position: absolute;
            left: 0;
            top: 0;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), var(--accent-cyan));
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
        }
        .step-list li strong {
            color: var(--text);
            display: block;
            font-size: 1.15rem;
            margin-bottom: 6px;
        }

        /* FAQ */
        .faq-item {
            background: var(--card-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            margin-bottom: 16px;
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: var(--border-glow);
        }
        .faq-item h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin: 0;
            color: var(--text);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-item p {
            color: var(--text-weak);
            margin-top: 12px;
            line-height: 1.7;
            display: none;
        }
        .faq-item.open p {
            display: block;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, rgba(0,82,255,0.12) 0%, rgba(0,240,255,0.07) 100%);
            border: 1px solid var(--border);
            border-radius: var(--radius);
        }

        /* Footer */
        .site-footer {
            background: var(--secondary-bg);
            border-top: 1px solid var(--border);
            padding: 60px 0 30px;
            margin-top: 80px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text);
        }
        .footer-links {
            list-style: none;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: var(--text-weak);
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-cyan);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            text-align: center;
            color: var(--text-weak);
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .section-header h2 {
                font-size: 1.9rem;
            }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid rgba(0, 82, 255, 0.3);
            }
            .nav-links.open {
                display: flex;
            }
            .mobile-menu-toggle {
                display: block;
            }
            .nav-actions {
                gap: 8px;
            }
            .btn-login, .btn-signup {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .page-hero {
                min-height: 40vh;
                padding: 120px 0 60px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .section-pad {
                padding: 50px 0;
            }
            .step-list li {
                padding-left: 50px;
            }
            .step-list li::before {
                width: 36px;
                height: 36px;
                font-size: 0.95rem;
            }
        }

@keyframes pulse {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(1.3); }
        }