/* roulang page: index */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --accent: #0052FF;
            --neon: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --border-color: #1F2937;
            --card-bg: #111827;
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-glow-hover: 0 0 30px rgba(0, 240, 255, 0.8);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            background-color: var(--bg-primary);
            color: var(--text-secondary);
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }
        /* Header & Navigation */
        header {
            background-color: rgba(13, 17, 30, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            transition: background-color 0.3s ease;
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo-text {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--text-primary), var(--cyber-neon));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
        }
        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all 0.2s ease;
            position: relative;
            padding-bottom: 4px;
            white-space: nowrap;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--text-primary);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--cyber-neon);
            box-shadow: var(--shadow-glow);
            transition: width 0.3s ease;
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .btn-login {
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            padding: 0.5rem 1.25rem;
            border-radius: 0.5rem;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            white-space: nowrap;
        }
        .btn-login:hover {
            border-color: var(--cyber-neon);
            color: var(--text-primary);
            box-shadow: 0 0 12px rgba(0,240,255,0.25);
        }
        .btn-signup {
            background: var(--accent);
            border: none;
            color: white;
            padding: 0.5rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.5);
            white-space: nowrap;
        }
        .btn-signup:hover {
            background: #1a6bff;
            box-shadow: 0 0 30px rgba(0, 82, 255, 0.8);
            transform: translateY(-1px);
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: var(--text-secondary);
            font-size: 1.5rem;
            cursor: pointer;
        }
        /* FAB */
        .fab-left {
            position: fixed;
            left: 1.5rem;
            bottom: 6rem;
            z-index: 50;
            width: 52px;
            height: 52px;
            border-radius: 9999px;
            background: rgba(0,0,0,0.7);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.45);
            color: var(--cyber-neon);
            font-size: 1.6rem;
        }
        .fab-left::before {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: 9999px;
            padding: 2px;
            background: linear-gradient(135deg, var(--cyber-neon), var(--accent));
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
        }
        .fab-left:hover {
            transform: scale(1.12);
            box-shadow: 0 0 32px rgba(0, 240, 255, 0.8);
        }
        /* Hero */
        .hero-section {
            position: relative;
            min-height: 90vh;
            display: flex;
            align-items: center;
            overflow: hidden;
            margin-top: 0;
            padding-top: 72px;
        }
        .hero-video-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: 0;
            filter: brightness(0.4);
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(8,9,15,0.85) 0%, rgba(8,9,15,0.4) 60%, rgba(8,9,15,0.7) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 700px;
            padding: 3rem 0;
        }
        .hero-play-btn {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: rgba(0, 240, 255, 0.15);
            border: 2px solid var(--cyber-neon);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: 0.3s;
            margin-bottom: 2rem;
            color: var(--cyber-neon);
            font-size: 1.8rem;
            box-shadow: 0 0 30px rgba(0,240,255,0.4);
        }
        .hero-play-btn:hover {
            background: rgba(0, 240, 255, 0.3);
            box-shadow: 0 0 45px rgba(0,240,255,0.7);
        }
        /* Sections */
        section {
            padding: 5rem 0;
        }
        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 1rem;
            letter-spacing: -0.5px;
        }
        .section-subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 700px;
            margin-bottom: 3rem;
        }
        .glass-card {
            background: rgba(17, 24, 39, 0.7);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-color);
            border-radius: 1rem;
            transition: 0.3s;
        }
        .glass-card:hover {
            border-color: var(--cyber-neon);
            box-shadow: 0 0 20px rgba(0,240,255,0.25);
        }
        /* Buttons */
        .btn-primary-glow {
            background: var(--accent);
            color: white;
            padding: 0.75rem 2rem;
            border-radius: 0.75rem;
            font-weight: 700;
            border: none;
            cursor: pointer;
            transition: 0.3s;
            box-shadow: 0 0 25px rgba(0, 82, 255, 0.6);
            display: inline-block;
            text-decoration: none;
        }
        .btn-primary-glow:hover {
            box-shadow: 0 0 40px rgba(0, 82, 255, 0.9);
            transform: translateY(-2px);
        }
        /* News list */
        .news-item {
            border-bottom: 1px solid var(--border-color);
            padding: 1.25rem 0;
            display: flex;
            gap: 1.5rem;
            align-items: flex-start;
        }
        .news-item:last-child { border-bottom: none; }
        /* Footer */
        footer {
            background-color: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 3rem 0;
            color: var(--text-secondary);
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            .container { padding-left: 1.25rem; padding-right: 1.25rem; }
        }
        @media (max-width: 768px) {
            .nav-links { display: none; }
            .mobile-menu-btn { display: block; }
            .nav-right { gap: 0.75rem; }
            .btn-login, .btn-signup { padding: 0.4rem 1rem; font-size: 0.8rem; }
            .section-title { font-size: 2rem; }
            .hero-content { padding: 2rem 0; }
            .fab-left { left: 1rem; bottom: 5rem; width: 48px; height: 48px; }
        }

/* roulang page: article */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --accent: #0052FF;
            --neon: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --border-color: #1F2937;
            --card-bg: #111827;
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-glow-hover: 0 0 30px rgba(0, 240, 255, 0.8);
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
        }

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

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

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

        a {
            text-decoration: none;
            color: inherit;
        }

        button {
            cursor: pointer;
            font-family: inherit;
        }

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

        header {
            background-color: rgba(13, 17, 30, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            transition: background-color 0.3s ease;
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .logo-text {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--text-primary), var(--neon));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
        }

        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all 0.2s ease;
            position: relative;
            padding-bottom: 4px;
            white-space: nowrap;
        }

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

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--neon);
            box-shadow: var(--shadow-glow);
            transition: width 0.3s ease;
        }

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

        .nav-right {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .btn-login {
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            padding: 0.5rem 1.25rem;
            border-radius: 0.5rem;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .btn-login:hover {
            border-color: var(--neon);
            color: var(--text-primary);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
        }

        .btn-signup {
            background: var(--accent);
            border: none;
            color: white;
            padding: 0.5rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.5);
            white-space: nowrap;
        }

        .btn-signup:hover {
            background: #1a6bff;
            box-shadow: 0 0 30px rgba(0, 82, 255, 0.8);
            transform: translateY(-1px);
        }

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

        section {
            padding: 4rem 0;
        }

        .glass-card {
            background: rgba(17, 24, 39, 0.7);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            transition: all 0.3s ease;
        }

        .glass-card:hover {
            border-color: var(--neon);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.25);
            transform: translateY(-2px);
        }

        .btn-primary-glow {
            background: var(--accent);
            border: none;
            color: white;
            padding: 0.75rem 2rem;
            border-radius: var(--radius-md);
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.5);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }

        .btn-primary-glow:hover {
            background: #1a6bff;
            box-shadow: 0 0 35px rgba(0, 82, 255, 0.8);
            transform: translateY(-2px);
        }

        .article-content h2 {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-top: 2rem;
            margin-bottom: 1rem;
            border-left: 4px solid var(--neon);
            padding-left: 1rem;
        }

        .article-content h3 {
            font-size: 1.35rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-top: 1.5rem;
            margin-bottom: 0.75rem;
        }

        .article-content p {
            margin-bottom: 1.25rem;
            line-height: 1.75;
        }

        .article-content ul,
        .article-content ol {
            margin-bottom: 1.25rem;
            padding-left: 1.5rem;
        }

        .article-content li {
            margin-bottom: 0.5rem;
        }

        .article-content img {
            border-radius: var(--radius-lg);
            margin: 1.5rem 0;
        }

        .article-content blockquote {
            border-left: 4px solid var(--neon);
            padding: 1rem 1.5rem;
            background: rgba(0, 240, 255, 0.05);
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin: 1.5rem 0;
            font-style: italic;
            color: var(--text-primary);
        }

        .category-tag {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            color: var(--neon);
            padding: 0.35rem 1rem;
            border-radius: 2rem;
            font-size: 0.85rem;
            font-weight: 600;
        }

        footer {
            background-color: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 3rem 0 1.5rem;
        }

        footer h3 {
            color: var(--text-primary);
            font-weight: 700;
            margin-bottom: 1rem;
        }

        footer a {
            color: var(--text-secondary);
            transition: color 0.2s ease;
        }

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

        .fab-fixed {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 2rem;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), linear-gradient(135deg, var(--neon), var(--accent));
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--neon);
            font-size: 1.4rem;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
            animation: floatSlow 3s ease-in-out infinite;
        }

        .fab-fixed:hover {
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.7);
            transform: scale(1.1);
        }

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

        @media (max-width: 1024px) {
            .nav-links {
                gap: 1.25rem;
            }
            .nav-link {
                font-size: 0.85rem;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: rgba(13, 17, 30, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 1.5rem;
                gap: 1rem;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.mobile-open {
                display: flex;
            }
            .mobile-menu-btn {
                display: block;
            }
            .logo-text {
                font-size: 1.25rem;
            }
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            section {
                padding: 2.5rem 0;
            }
            .article-content h2 {
                font-size: 1.4rem;
            }
        }

/* roulang page: category1 */
/* ========== DESIGN SYSTEM (Aligned with Index) ========== */
        :root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --accent: #0052FF;
            --cyber-neon: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --border-color: #1F2937;
            --card-bg: #111827;
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-glow-hover: 0 0 30px rgba(0, 240, 255, 0.8);
        }

        body {
            background-color: var(--bg-primary);
            color: var(--text-secondary);
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

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

        /* Header & Navigation */
        header {
            background-color: rgba(13, 17, 30, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            transition: background-color 0.3s ease;
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .logo-text {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--text-primary), var(--cyber-neon));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
        }

        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all 0.2s ease;
            position: relative;
            padding-bottom: 4px;
            white-space: nowrap;
        }

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

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--cyber-neon);
            box-shadow: var(--shadow-glow);
            transition: width 0.3s ease;
        }

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

        .nav-right {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .btn-login {
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            padding: 0.5rem 1.25rem;
            border-radius: 0.5rem;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .btn-login:hover {
            border-color: var(--cyber-neon);
            color: var(--text-primary);
            box-shadow: 0 0 12px rgba(0,240,255,0.25);
        }

        .btn-signup {
            background: var(--accent);
            border: none;
            color: white;
            padding: 0.5rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.5);
            white-space: nowrap;
        }

        .btn-signup:hover {
            background: #1a6bff;
            box-shadow: 0 0 30px rgba(0, 82, 255, 0.8);
            transform: translateY(-1px);
        }

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

        /* Glassmorphism Card Style */
        .glass-card {
            background: rgba(17, 24, 39, 0.7);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-color);
            border-radius: 1rem;
            transition: all 0.3s ease;
        }

        .glass-card:hover {
            border-color: var(--cyber-neon);
            box-shadow: 0 0 25px rgba(0,240,255,0.25);
            transform: translateY(-4px);
        }

        /* Glow Buttons */
        .btn-primary-glow {
            background: var(--accent);
            color: white;
            padding: 0.75rem 2rem;
            border-radius: 0.75rem;
            font-weight: 700;
            border: none;
            cursor: pointer;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.5);
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
        }

        .btn-primary-glow:hover {
            box-shadow: 0 0 35px rgba(0, 82, 255, 0.9);
            transform: translateY(-2px);
            background: #1a6bff;
        }

        .btn-outline-glow {
            background: transparent;
            border: 1px solid var(--cyber-neon);
            color: var(--cyber-neon);
            padding: 0.75rem 2rem;
            border-radius: 0.75rem;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
        }

        .btn-outline-glow:hover {
            background: rgba(0, 240, 255, 0.1);
            box-shadow: 0 0 25px rgba(0,240,255,0.6);
            transform: translateY(-2px);
        }

        /* Section Titles */
        .section-title {
            font-size: 2.25rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 700px;
        }

        /* FAB Button */
        .fab-container {
            position: fixed;
            left: 1.5rem;
            bottom: 6rem;
            z-index: 50;
        }

        .fab-button {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(8px);
            border: 2px solid var(--cyber-neon);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--cyber-neon);
            font-size: 1.5rem;
            cursor: pointer;
            box-shadow: 0 0 20px rgba(0,240,255,0.4);
            transition: all 0.3s ease;
            text-decoration: none;
        }

        .fab-button:hover {
            box-shadow: 0 0 40px rgba(0,240,255,0.8);
            transform: scale(1.1);
            background: rgba(0, 240, 255, 0.15);
        }

        /* Footer */
        footer {
            background-color: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 3rem 0 2rem;
            margin-top: 2rem;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .nav-links {
                display: none;
            }
            .mobile-menu-btn {
                display: block;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .hero-content h1 {
                font-size: 2rem;
            }
            .grid-cols-1 {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 520px) {
            .btn-login, .btn-signup {
                padding: 0.4rem 1rem;
                font-size: 0.8rem;
            }
            .nav-container {
                height: 64px;
            }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --accent: #0052FF;
            --neon: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --border-color: #1F2937;
            --card-bg: #111827;
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-glow-hover: 0 0 30px rgba(0, 240, 255, 0.8);
        }

        body {
            background-color: var(--bg-primary);
            color: var(--text-secondary);
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            margin: 0;
        }

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

        /* Header & Navigation */
        header {
            background-color: rgba(13, 17, 30, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .logo-text {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--text-primary), var(--neon));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
        }

        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all 0.2s ease;
            position: relative;
            padding-bottom: 4px;
            white-space: nowrap;
        }

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

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--neon);
            box-shadow: var(--shadow-glow);
            transition: width 0.3s ease;
        }

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

        .nav-right {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .btn-login {
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            padding: 0.5rem 1.25rem;
            border-radius: 0.5rem;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .btn-login:hover {
            border-color: var(--neon);
            color: var(--text-primary);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
        }

        .btn-signup {
            background: var(--accent);
            border: none;
            color: white;
            padding: 0.5rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.5);
            white-space: nowrap;
        }

        .btn-signup:hover {
            background: #1a6bff;
            box-shadow: 0 0 30px rgba(0, 82, 255, 0.8);
            transform: translateY(-1px);
        }

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

        /* Glass Card */
        .glass-card {
            background: rgba(17, 24, 39, 0.7);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-color);
            border-radius: 1.25rem;
            transition: all 0.3s ease;
        }

        .glass-card:hover {
            border-color: var(--neon);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.3);
            transform: translateY(-4px);
        }

        /* Buttons */
        .btn-primary-glow {
            background: var(--accent);
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 0.75rem;
            font-weight: 700;
            border: none;
            cursor: pointer;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.6);
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
        }

        .btn-primary-glow:hover {
            box-shadow: 0 0 35px rgba(0, 82, 255, 0.9);
            transform: scale(1.03);
            background: #1a6bff;
        }

        .btn-outline-neon {
            background: transparent;
            border: 1.5px solid var(--neon);
            color: var(--neon);
            padding: 0.8rem 2rem;
            border-radius: 0.75rem;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }

        .btn-outline-neon:hover {
            background: rgba(0, 240, 255, 0.1);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.5);
        }

        /* Odds Table */
        .odds-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0 8px;
        }

        .odds-table th {
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            padding: 0.75rem 1rem;
        }

        .odds-table td {
            background: rgba(17, 24, 39, 0.8);
            padding: 1rem;
            color: var(--text-primary);
            font-weight: 500;
            transition: 0.2s;
            border: 1px solid transparent;
        }

        .odds-table tr td:first-child {
            border-radius: 0.75rem 0 0 0.75rem;
        }

        .odds-table tr td:last-child {
            border-radius: 0 0.75rem 0.75rem 0;
        }

        .odds-table tr:hover td {
            background: rgba(0, 82, 255, 0.15);
            border-color: var(--accent);
        }

        .odd-value {
            background: var(--accent);
            color: white;
            padding: 0.3rem 0.8rem;
            border-radius: 0.4rem;
            font-weight: 700;
            margin: 0 2px;
        }

        .footer-link {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color 0.2s;
        }

        .footer-link:hover {
            color: var(--neon);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .nav-links {
                gap: 1.2rem;
            }
            .nav-link {
                font-size: 0.85rem;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: rgba(8, 9, 15, 0.98);
                flex-direction: column;
                padding: 2rem;
                border-bottom: 1px solid var(--border-color);
                backdrop-filter: blur(20px);
            }
            .nav-links.active {
                display: flex;
            }
            .mobile-menu-btn {
                display: block;
            }
            .nav-right {
                gap: 0.5rem;
            }
            .btn-login,
            .btn-signup {
                padding: 0.4rem 1rem;
                font-size: 0.8rem;
            }
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .odds-table {
                font-size: 0.85rem;
            }
        }

        @media (max-width: 520px) {
            .logo-text {
                font-size: 1.2rem;
            }
        }

/* roulang page: category3 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --accent: #0052FF;
            --cyber-neon: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --border-color: #1F2937;
            --card-bg: #111827;
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-glow-hover: 0 0 30px rgba(0, 240, 255, 0.8);
            --glass-bg: rgba(13, 17, 30, 0.6);
        }

        body {
            background-color: var(--bg-primary);
            color: var(--text-secondary);
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            margin: 0;
        }

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

        header {
            background-color: rgba(13, 17, 30, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .logo-text {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--text-primary), var(--cyber-neon));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
        }

        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all 0.2s ease;
            position: relative;
            padding-bottom: 4px;
            white-space: nowrap;
        }

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

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--cyber-neon);
            box-shadow: var(--shadow-glow);
            transition: width 0.3s ease;
        }

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

        .nav-right {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .btn-login {
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            padding: 0.5rem 1.25rem;
            border-radius: 0.5rem;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .btn-login:hover {
            border-color: var(--cyber-neon);
            color: var(--text-primary);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
        }

        .btn-signup {
            background: var(--accent);
            border: none;
            color: white;
            padding: 0.5rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.5);
            white-space: nowrap;
        }

        .btn-signup:hover {
            background: #1a6bff;
            box-shadow: 0 0 30px rgba(0, 82, 255, 0.8);
            transform: translateY(-1px);
        }

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

        .glass-card {
            background: rgba(17, 24, 39, 0.6);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-color);
            border-radius: 1.25rem;
            transition: all 0.3s ease;
        }

        .glass-card:hover {
            border-color: rgba(0, 240, 255, 0.35);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 240, 255, 0.15);
            transform: translateY(-3px);
        }

        .btn-primary-glow {
            background: var(--accent);
            color: white;
            font-weight: 700;
            padding: 0.9rem 2.2rem;
            border-radius: 3rem;
            border: none;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1rem;
            box-shadow: 0 4px 20px rgba(0, 82, 255, 0.6);
            transition: all 0.3s ease;
            text-decoration: none;
        }

        .btn-primary-glow:hover {
            background: #1a6bff;
            box-shadow: 0 6px 28px rgba(0, 82, 255, 0.9);
            transform: translateY(-1px);
        }

        .section-badge {
            display: inline-block;
            padding: 0.3rem 1rem;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: 2rem;
            color: var(--cyber-neon);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 1rem;
        }

        h1, h2, h3 {
            color: var(--text-primary);
            line-height: 1.3;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 1.5rem 0;
            cursor: pointer;
        }

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

        .faq-answer {
            color: var(--text-secondary);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, margin-top 0.3s ease;
            margin-top: 0;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            margin-top: 1rem;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            color: var(--cyber-neon);
        }

        .faq-icon {
            font-size: 1.2rem;
            transition: transform 0.3s ease, color 0.2s;
        }

        @media (max-width: 1024px) {
            .nav-links {
                gap: 1.2rem;
            }
            .logo-text {
                font-size: 1.3rem;
            }
        }

        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
            .nav-links {
                position: fixed;
                top: 72px;
                left: 0;
                width: 100%;
                background: rgba(8, 9, 15, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                align-items: flex-start;
                padding: 2rem;
                gap: 1.8rem;
                transform: translateY(-120%);
                transition: transform 0.35s ease;
                border-bottom: 1px solid var(--border-color);
                z-index: 999;
            }
            .nav-links.mobile-active {
                transform: translateY(0);
            }
            .nav-right {
                gap: 0.75rem;
            }
            .hero-content h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .btn-login, .btn-signup {
                padding: 0.4rem 1rem;
                font-size: 0.8rem;
            }
        }

/* roulang page: category4 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --accent: #0052FF;
            --neon: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --border-color: #1F2937;
            --card-bg: #111827;
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-glow-hover: 0 0 30px rgba(0, 240, 255, 0.8);
        }
        body {
            background-color: var(--bg-primary);
            color: var(--text-secondary);
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }
        header {
            background-color: rgba(13, 17, 30, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            transition: background-color 0.3s ease;
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo-text {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--text-primary), var(--neon));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
        }
        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all 0.2s ease;
            position: relative;
            padding-bottom: 4px;
            white-space: nowrap;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--text-primary);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--neon);
            box-shadow: var(--shadow-glow);
            transition: width 0.3s ease;
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .btn-login {
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            padding: 0.5rem 1.25rem;
            border-radius: 0.5rem;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            white-space: nowrap;
        }
        .btn-login:hover {
            border-color: var(--neon);
            color: var(--text-primary);
            box-shadow: 0 0 12px rgba(0,240,255,0.25);
        }
        .btn-signup {
            background: var(--accent);
            border: none;
            color: white;
            padding: 0.5rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.5);
            white-space: nowrap;
        }
        .btn-signup:hover {
            background: #1a6bff;
            box-shadow: 0 0 30px rgba(0, 82, 255, 0.8);
            transform: translateY(-1px);
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: var(--text-secondary);
            font-size: 1.5rem;
            cursor: pointer;
        }
        section {
            padding: 5rem 0;
        }
        .glass-card {
            background: rgba(17, 24, 39, 0.7);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-color);
            border-radius: 1rem;
            transition: 0.3s;
        }
        .glass-card:hover {
            border-color: var(--neon);
            box-shadow: 0 0 20px rgba(0,240,255,0.25);
            transform: translateY(-2px);
        }
        .btn-primary-glow {
            background: var(--accent);
            border: none;
            color: white;
            padding: 0.75rem 2rem;
            border-radius: 0.75rem;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.45);
            text-decoration: none;
            display: inline-block;
        }
        .btn-primary-glow:hover {
            background: #1a6bff;
            box-shadow: 0 0 35px rgba(0, 82, 255, 0.75);
            transform: translateY(-2px);
        }
        .btn-outline-glow {
            background: transparent;
            border: 1px solid var(--neon);
            color: var(--neon);
            padding: 0.75rem 2rem;
            border-radius: 0.75rem;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 0 10px rgba(0,240,255,0.2);
            text-decoration: none;
            display: inline-block;
        }
        .btn-outline-glow:hover {
            background: rgba(0,240,255,0.1);
            box-shadow: 0 0 25px rgba(0,240,255,0.5);
            transform: translateY(-2px);
        }
        footer {
            background-color: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 3rem 0;
            text-align: left;
        }
        @media (max-width: 1024px) {
            .nav-links {
                gap: 1.2rem;
            }
            .nav-link {
                font-size: 0.85rem;
            }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: rgba(13, 17, 30, 0.98);
                flex-direction: column;
                padding: 1.5rem;
                gap: 1.25rem;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.active-mobile {
                display: flex;
            }
            .mobile-menu-btn {
                display: block;
            }
            section {
                padding: 3rem 0;
            }
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
        }