/* roulang page: index */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.85);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --accent-pink: #FF007F;
            --accent-yellow: #FFFF00;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 240, 255, 0.4);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-blue: 0 0 20px rgba(0, 82, 255, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --space-xs: 0.5rem;
            --space-sm: 1rem;
            --space-md: 1.5rem;
            --space-lg: 2.5rem;
            --space-xl: 4rem;
            --space-2xl: 6rem;
            --font-title: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            background-image: 
                radial-gradient(ellipse at 20% 0%, rgba(0, 82, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 100%, rgba(0, 240, 255, 0.05) 0%, transparent 50%);
            background-attachment: fixed;
        }

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

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

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

        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: var(--space-sm);
            padding-right: var(--space-sm);
        }

        @media (min-width: 768px) {
            .container {
                padding-left: var(--space-md);
                padding-right: var(--space-md);
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: var(--space-lg);
                padding-right: var(--space-lg);
            }
        }

        /* Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 50;
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            padding: 0 var(--space-sm);
            max-width: 1280px;
            margin: 0 auto;
        }

        .logo {
            font-family: var(--font-title);
            font-size: 1.25rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--space-md);
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-silver);
            position: relative;
            padding: 0.35rem 0;
            transition: var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
            transition: width var(--transition-fast);
            border-radius: 2px;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-white);
            text-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: var(--space-xs);
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-white);
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: var(--radius-sm);
            transition: var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
        }

        .btn-signup {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--bg-primary);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            border: none;
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
            transition: var(--transition-smooth);
        }

        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.7);
            transform: translateY(-1px);
        }

        .mobile-menu-toggle {
            display: none;
            background: transparent;
            border: none;
            color: var(--text-white);
            font-size: 1.5rem;
            padding: 0.5rem;
        }

        @media (max-width: 1023px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.98);
                backdrop-filter: blur(25px);
                flex-direction: column;
                padding: var(--space-md);
                border-bottom: 1px solid rgba(0, 240, 255, 0.2);
                gap: var(--space-sm);
            }
            .nav-links.open {
                display: flex;
            }
            .mobile-menu-toggle {
                display: block;
            }
            .nav-actions {
                gap: 0.5rem;
            }
            .btn-login, .btn-signup {
                padding: 0.5rem 0.9rem;
                font-size: 0.85rem;
            }
        }

        /* Hero */
        .hero-section {
            padding-top: 120px;
            padding-bottom: var(--space-2xl);
            position: relative;
            overflow: hidden;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.jpg');
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 0;
            filter: brightness(0.7) saturate(1.3);
        }

        .hero-content {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: 1fr;
            gap: var(--space-xl);
            align-items: center;
        }

        @media (min-width: 1024px) {
            .hero-content {
                grid-template-columns: 1.2fr 0.8fr;
            }
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.4rem 1rem;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--accent-cyan);
            margin-bottom: var(--space-md);
        }

        .hero-badge i {
            font-size: 0.75rem;
        }

        .hero-title {
            font-family: var(--font-title);
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            font-weight: 900;
            line-height: 1.15;
            letter-spacing: -0.03em;
            margin-bottom: var(--space-md);
            background: linear-gradient(135deg, #FFFFFF 0%, #CBD5E1 60%, #00F0FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-desc {
            font-size: 1.1rem;
            line-height: 1.7;
            color: var(--text-silver);
            margin-bottom: var(--space-lg);
            max-width: 600px;
        }

        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-sm);
            margin-bottom: var(--space-lg);
        }

        .btn-primary {
            padding: 0.85rem 2rem;
            font-size: 1rem;
            font-weight: 700;
            border: none;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            color: var(--bg-primary);
            box-shadow: var(--shadow-neon);
            transition: var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }

        .btn-primary:hover {
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.7), 0 0 50px rgba(0, 82, 255, 0.5);
            transform: translateY(-2px);
        }

        .btn-secondary {
            padding: 0.85rem 2rem;
            font-size: 1rem;
            font-weight: 700;
            border: 1.5px solid var(--accent-cyan);
            border-radius: var(--radius-md);
            background: transparent;
            color: var(--accent-cyan);
            transition: var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }

        .btn-secondary:hover {
            background: rgba(0, 240, 255, 0.08);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
        }

        .hero-trust {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            flex-wrap: wrap;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .hero-trust i {
            color: var(--accent-cyan);
            font-size: 1rem;
        }

        .hero-visual {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .hero-visual img {
            border-radius: var(--radius-lg);
            box-shadow: 0 20px 60px rgba(0, 82, 255, 0.3);
            border: 1px solid rgba(0, 240, 255, 0.2);
            max-height: 450px;
            object-fit: cover;
        }

        @media (max-width: 1023px) {
            .hero-visual {
                order: -1;
            }
            .hero-visual img {
                max-height: 300px;
            }
        }

        /* Section Common */
        .section {
            padding: var(--space-2xl) 0;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--accent-cyan);
            margin-bottom: var(--space-xs);
        }

        .section-title {
            font-family: var(--font-title);
            font-size: clamp(1.8rem, 3.5vw, 2.5rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: var(--space-md);
            color: var(--text-white);
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-silver);
            max-width: 700px;
            line-height: 1.65;
        }

        /* Card Glass */
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            border: 1px solid rgba(0, 240, 255, 0.15);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            transition: var(--transition-smooth);
        }

        .glass-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 10px 40px rgba(0, 240, 255, 0.12);
            transform: translateY(-4px);
        }

        /* Matrix Grid */
        .matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: var(--space-md);
        }

        /* Featured Categories */
        .cat-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-xs);
            margin-bottom: var(--space-lg);
        }

        .cat-tab {
            padding: 0.55rem 1.3rem;
            font-size: 0.9rem;
            font-weight: 600;
            border-radius: 50px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: var(--text-silver);
            transition: var(--transition-fast);
            white-space: nowrap;
        }

        .cat-tab:hover,
        .cat-tab.active {
            background: rgba(0, 240, 255, 0.1);
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
        }

        /* News List */
        .news-list-item {
            display: flex;
            gap: var(--space-md);
            padding: var(--space-md) 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--transition-fast);
            align-items: flex-start;
        }

        .news-list-item:hover {
            background: rgba(0, 240, 255, 0.03);
            padding-left: var(--space-xs);
            border-radius: var(--radius-sm);
        }

        .news-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            white-space: nowrap;
        }

        .news-title-link {
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-white);
            line-height: 1.4;
        }

        .news-title-link:hover {
            color: var(--accent-cyan);
        }

        /* Guest Spotlight */
        .spotlight-scroll {
            display: flex;
            gap: var(--space-md);
            overflow-x: auto;
            padding-bottom: var(--space-sm);
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
        }

        .spotlight-card {
            flex: 0 0 280px;
            scroll-snap-align: start;
            background: var(--bg-card);
            backdrop-filter: blur(15px);
            border: 1px solid rgba(0, 240, 255, 0.12);
            border-radius: var(--radius-lg);
            padding: var(--space-md);
            text-align: center;
            transition: var(--transition-smooth);
        }

        .spotlight-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transform: translateY(-6px);
        }

        .spotlight-avatar {
            width: 100px;
            height: 100px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto var(--space-sm);
            border: 3px solid var(--accent-cyan);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
        }

        .spotlight-name {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--text-white);
        }

        .spotlight-role {
            font-size: 0.85rem;
            color: var(--accent-cyan);
            margin-bottom: 0.3rem;
        }

        .spotlight-quote {
            font-size: 0.9rem;
            color: var(--text-silver);
            line-height: 1.5;
        }

        /* Collection Directory */
        .collection-card {
            background: var(--bg-card);
            backdrop-filter: blur(15px);
            border: 1px solid rgba(0, 240, 255, 0.1);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
            transition: var(--transition-smooth);
        }

        .collection-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 12px 35px rgba(0, 240, 255, 0.1);
        }

        .collection-count {
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.1);
            padding: 0.2rem 0.8rem;
            border-radius: 50px;
            align-self: flex-start;
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            padding: var(--space-md) 0;
        }

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

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

        .faq-answer {
            margin-top: var(--space-sm);
            font-size: 0.95rem;
            color: var(--text-silver);
            line-height: 1.65;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.12), rgba(0, 240, 255, 0.06));
            border: 1px solid rgba(0, 240, 255, 0.2);
            border-radius: var(--radius-xl);
            padding: var(--space-xl);
            text-align: center;
        }

        /* Footer */
        .site-footer {
            border-top: 1px solid rgba(0, 240, 255, 0.12);
            padding: var(--space-xl) 0;
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: var(--space-lg);
        }

        .footer-col h4 {
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: var(--space-sm);
            font-size: 1rem;
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            padding: 0.25rem 0;
            transition: var(--transition-fast);
        }

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

        .footer-bottom {
            text-align: center;
            padding-top: var(--space-lg);
            margin-top: var(--space-lg);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        /* FAB */
        .fab {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50px;
            background: rgba(0, 0, 0, 0.75);
            backdrop-filter: blur(15px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.5rem;
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.45);
            transition: var(--transition-smooth);
            cursor: pointer;
        }

        .fab::before {
            content: '';
            position: absolute;
            inset: -3px;
            border-radius: 54px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            z-index: -1;
            opacity: 0.7;
            filter: blur(6px);
        }

        .fab:hover {
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.75);
            transform: scale(1.1);
        }

        @media (max-width: 640px) {
            .fab {
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
                bottom: 5rem;
            }
        }

        /* Utility */
        .text-glow {
            text-shadow: 0 0 15px rgba(0, 240, 255, 0.6);
        }

        .divider {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
            border-radius: 3px;
            margin: var(--space-sm) 0;
        }

/* roulang page: article */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.85);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --accent-pink: #FF007F;
            --accent-yellow: #FFFF00;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 240, 255, 0.4);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-blue: 0 0 20px rgba(0, 82, 255, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --space-xs: 0.5rem;
            --space-sm: 1rem;
            --space-md: 1.5rem;
            --space-lg: 2.5rem;
            --space-xl: 4rem;
            --space-2xl: 6rem;
            --font-title: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            background-image: 
                radial-gradient(ellipse at 20% 0%, rgba(0, 82, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 100%, rgba(0, 240, 255, 0.05) 0%, transparent 50%);
            background-attachment: fixed;
        }

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

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

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

        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: var(--space-md);
            padding-right: var(--space-md);
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: var(--space-lg);
                padding-right: var(--space-lg);
            }
        }

        /* Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 50;
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            padding: 0 var(--space-sm);
            max-width: 1280px;
            margin: 0 auto;
        }

        .logo {
            font-family: var(--font-title);
            font-size: 1.25rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-links {
            display: none;
            align-items: center;
            gap: var(--space-md);
        }

        @media (min-width: 768px) {
            .nav-links {
                display: flex;
            }
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-silver);
            position: relative;
            padding: 0.35rem 0;
            transition: var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
            transition: width var(--transition-fast);
            border-radius: 2px;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-white);
            text-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: var(--space-xs);
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-white);
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: var(--radius-sm);
            transition: var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
        }

        .btn-signup {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--bg-primary);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            border: none;
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
            transition: var(--transition-smooth);
        }

        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.7);
            transform: translateY(-1px);
        }

        .mobile-menu-toggle {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--radius-sm);
            color: var(--text-white);
            font-size: 1.2rem;
        }

        @media (min-width: 768px) {
            .mobile-menu-toggle {
                display: none;
            }
        }

        /* Article Content Styles */
        .article-wrapper {
            padding-top: 100px;
            padding-bottom: var(--space-xl);
        }

        .article-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .article-header {
            margin-bottom: var(--space-xl);
            position: relative;
        }

        .article-category-badge {
            display: inline-block;
            padding: 0.35rem 1rem;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: 999px;
            color: var(--accent-cyan);
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: var(--space-sm);
        }

        .article-title {
            font-family: var(--font-title);
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-white);
            margin-bottom: var(--space-sm);
            background: linear-gradient(135deg, var(--text-white), var(--accent-cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

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

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

        .article-featured-image {
            width: 100%;
            height: 400px;
            object-fit: cover;
            border-radius: var(--radius-lg);
            margin-bottom: var(--space-xl);
            border: 1px solid rgba(0, 240, 255, 0.2);
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
        }

        .article-body {
            font-size: 1.05rem;
            line-height: 1.8;
            color: var(--text-silver);
        }

        .article-body h2 {
            font-family: var(--font-title);
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text-white);
            margin-top: var(--space-xl);
            margin-bottom: var(--space-md);
            padding-bottom: var(--space-xs);
            border-bottom: 2px solid rgba(0, 240, 255, 0.2);
        }

        .article-body h3 {
            font-family: var(--font-title);
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--accent-cyan);
            margin-top: var(--space-lg);
            margin-bottom: var(--space-sm);
        }

        .article-body p {
            margin-bottom: var(--space-md);
        }

        .article-body ul,
        .article-body ol {
            margin-bottom: var(--space-md);
            padding-left: 1.5rem;
        }

        .article-body li {
            margin-bottom: var(--space-xs);
        }

        .article-body strong {
            color: var(--text-white);
            font-weight: 700;
        }

        .article-body blockquote {
            border-left: 3px solid var(--accent-cyan);
            padding: var(--space-sm) var(--space-md);
            margin: var(--space-lg) 0;
            background: rgba(0, 240, 255, 0.05);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-silver);
            font-style: italic;
        }

        .article-body img {
            border-radius: var(--radius-md);
            margin: var(--space-md) 0;
        }

        /* Not Found State */
        .not-found-state {
            text-align: center;
            padding: var(--space-2xl) var(--space-md);
        }

        .not-found-state i {
            font-size: 4rem;
            color: var(--accent-cyan);
            margin-bottom: var(--space-md);
            opacity: 0.6;
        }

        .not-found-state h2 {
            font-size: 1.8rem;
            margin-bottom: var(--space-sm);
        }

        .not-found-state p {
            color: var(--text-muted);
            margin-bottom: var(--space-lg);
        }

        .btn-back-home {
            display: inline-block;
            padding: 0.75rem 2rem;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            color: var(--bg-primary);
            font-weight: 600;
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
            transition: var(--transition-smooth);
        }

        .btn-back-home:hover {
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.7);
            transform: translateY(-2px);
        }

        /* Floating Action Button */
        .fab {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 999px;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(10px);
            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 15px rgba(0, 240, 255, 0.5);
            transition: var(--transition-smooth);
            cursor: pointer;
            opacity: 0.7;
            animation: fabPulse 3s ease-in-out infinite;
        }

        .fab::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 999px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            z-index: -1;
            opacity: 0.8;
        }

        .fab:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.8);
        }

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

        @keyframes fabPulse {
            0%, 100% { box-shadow: 0 0 15px rgba(0, 240, 255, 0.5); }
            50% { box-shadow: 0 0 25px rgba(0, 240, 255, 0.8); }
        }

        /* Footer */
        .site-footer {
            background: rgba(13, 17, 30, 0.9);
            border-top: 1px solid rgba(0, 240, 255, 0.15);
            padding: var(--space-xl) 0 var(--space-md);
            margin-top: var(--space-2xl);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: var(--space-lg);
            margin-bottom: var(--space-lg);
        }

        @media (min-width: 640px) {
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .footer-col h4 {
            font-family: var(--font-title);
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: var(--space-sm);
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            padding: 0.35rem 0;
            transition: var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
            text-shadow: 0 0 8px rgba(0, 240, 255, 0.4);
            padding-left: 0.25rem;
        }

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

        /* Responsive Adjustments */
        @media (max-width: 767px) {
            .article-title {
                font-size: 1.6rem;
            }
            .article-featured-image {
                height: 240px;
            }
            .article-body {
                font-size: 1rem;
            }
            .logo {
                font-size: 1rem;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.85);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --accent-pink: #FF007F;
            --accent-yellow: #FFFF00;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 240, 255, 0.4);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-blue: 0 0 20px rgba(0, 82, 255, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --space-xs: 0.5rem;
            --space-sm: 1rem;
            --space-md: 1.5rem;
            --space-lg: 2.5rem;
            --space-xl: 4rem;
            --space-2xl: 6rem;
            --font-title: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            background-image: 
                radial-gradient(ellipse at 20% 0%, rgba(0, 82, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 100%, rgba(0, 240, 255, 0.05) 0%, transparent 50%);
            background-attachment: fixed;
        }

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

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

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

        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: var(--space-sm);
            padding-right: var(--space-sm);
        }

        @media (min-width: 768px) {
            .container {
                padding-left: var(--space-md);
                padding-right: var(--space-md);
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: var(--space-lg);
                padding-right: var(--space-lg);
            }
        }

        /* Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 50;
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            padding: 0 var(--space-sm);
            max-width: 1280px;
            margin: 0 auto;
        }

        .logo {
            font-family: var(--font-title);
            font-size: 1.25rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--space-md);
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-silver);
            position: relative;
            padding: 0.35rem 0;
            transition: var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
            transition: width var(--transition-fast);
            border-radius: 2px;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-white);
            text-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: var(--space-xs);
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-white);
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: var(--radius-sm);
            transition: var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
        }

        .btn-signup {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--bg-primary);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            border: none;
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
            transition: var(--transition-smooth);
        }

        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.7);
            transform: translateY(-1px);
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 1.5rem;
            padding: 0.5rem;
        }

        @media (max-width: 768px) {
            .nav-links {
                position: fixed;
                top: 70px;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: var(--space-md);
                gap: var(--space-sm);
                display: none;
                border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            }

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

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

            .nav-actions .btn-login,
            .nav-actions .btn-signup {
                padding: 0.4rem 0.8rem;
                font-size: 0.8rem;
            }
            .logo {
                font-size: 1.1rem;
            }
        }

        /* Glass Card Base */
        .glass-card {
            background: rgba(13, 17, 30, 0.75);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid rgba(0, 240, 255, 0.2);
            border-radius: var(--radius-lg);
            transition: var(--transition-smooth);
        }

        .glass-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-neon);
            transform: translateY(-3px);
        }

        /* Tech Border Card */
        .tech-card {
            background: rgba(13, 17, 30, 0.6);
            border: 1px solid rgba(0, 82, 255, 0.3);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .tech-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
            opacity: 0;
            transition: opacity var(--transition-smooth);
        }

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

        .tech-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.3);
            transform: translateY(-2px);
        }

        /* Buttons */
        .btn-primary {
            display: inline-block;
            padding: 0.75rem 2rem;
            font-weight: 700;
            font-size: 1rem;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            color: var(--bg-primary);
            box-shadow: 0 4px 20px rgba(0, 82, 255, 0.5);
            transition: var(--transition-smooth);
            text-align: center;
        }

        .btn-primary:hover {
            box-shadow: 0 8px 30px rgba(0, 82, 255, 0.8);
            transform: translateY(-2px);
        }

        .btn-outline {
            display: inline-block;
            padding: 0.75rem 2rem;
            font-weight: 600;
            font-size: 1rem;
            border-radius: var(--radius-sm);
            background: transparent;
            border: 1px solid var(--border-glow);
            color: var(--accent-cyan);
            transition: var(--transition-smooth);
            text-align: center;
        }

        .btn-outline:hover {
            background: rgba(0, 240, 255, 0.1);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
        }

        /* FAB */
        .fab-btn {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50px;
            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;
            color: var(--accent-cyan);
            font-size: 1.5rem;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.5);
            transition: var(--transition-smooth);
            opacity: 0.65;
            animation: neonPulse 2.5s infinite;
        }

        .fab-btn::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            z-index: -1;
            mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            mask-composite: exclude;
            -webkit-mask-composite: xor;
            padding: 2px;
        }

        .fab-btn:hover {
            opacity: 1;
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.8);
            transform: scale(1.1);
            color: #fff;
        }

        .fab-btn:active {
            transform: scale(0.95);
            background: rgba(0, 240, 255, 0.2);
        }

        @keyframes neonPulse {
            0%, 100% { box-shadow: 0 0 15px rgba(0, 240, 255, 0.4); }
            50% { box-shadow: 0 0 28px rgba(0, 240, 255, 0.75); }
        }

        /* Section Headings */
        .section-title {
            font-family: var(--font-title);
            font-size: clamp(1.8rem, 4vw, 2.5rem);
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: var(--space-md);
            background: linear-gradient(to right, #fff, var(--text-silver));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 700px;
            line-height: 1.7;
        }

        /* Footer */
        .site-footer {
            background: rgba(8, 9, 15, 0.9);
            border-top: 1px solid rgba(0, 240, 255, 0.2);
            padding: var(--space-xl) 0 var(--space-md);
            margin-top: var(--space-2xl);
        }

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

        .footer-col h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: var(--space-sm);
            color: var(--text-white);
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
            transition: var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
            text-shadow: 0 0 8px rgba(0, 240, 255, 0.4);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: var(--space-md);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
            text-align: center;
        }

        .footer-bottom p {
            margin: 0;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

/* roulang page: category2 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.85);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --accent-pink: #FF007F;
            --accent-yellow: #FFFF00;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 240, 255, 0.4);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-blue: 0 0 20px rgba(0, 82, 255, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            background-image: 
                radial-gradient(ellipse at 20% 0%, rgba(0, 82, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 100%, rgba(0, 240, 255, 0.05) 0%, transparent 50%);
            background-attachment: fixed;
        }

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

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

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

        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        @media (min-width: 768px) {
            .container {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 50;
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            padding: 0 1rem;
            max-width: 1280px;
            margin: 0 auto;
        }

        .logo {
            font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            font-size: 1.25rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

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

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-silver);
            position: relative;
            padding: 0.35rem 0;
            transition: var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
            transition: width var(--transition-fast);
            border-radius: 2px;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-white);
            text-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-white);
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: var(--radius-sm);
            transition: var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
        }

        .btn-signup {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--bg-primary);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            border: none;
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
            transition: var(--transition-smooth);
        }

        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.7);
            transform: translateY(-1px);
        }

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

        @media (max-width: 1024px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 1.5rem;
                gap: 1rem;
                border-bottom: 1px solid rgba(0, 240, 255, 0.2);
            }

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

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

        /* Page Banner */
        .page-banner {
            padding: 120px 0 3rem;
            background: linear-gradient(180deg, rgba(0, 82, 255, 0.1) 0%, transparent 100%);
            position: relative;
        }

        .banner-content {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            text-align: left;
        }

        .banner-tag {
            display: inline-block;
            padding: 0.4rem 1.2rem;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: 2rem;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--accent-cyan);
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 1rem;
        }

        .page-banner h1 {
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1.2;
            background: linear-gradient(135deg, var(--accent-cyan), var(--text-white));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 1rem;
            max-width: 700px;
        }

        .page-banner p {
            font-size: 1.1rem;
            color: var(--text-silver);
            max-width: 600px;
            line-height: 1.6;
        }

        @media (max-width: 768px) {
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner p {
                font-size: 0.95rem;
            }
        }

        /* Tips Grid */
        .tips-section {
            padding: 3rem 0 5rem;
        }

        .tips-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }

        .tip-card {
            background: rgba(13, 17, 30, 0.6);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(0, 240, 255, 0.1);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition-smooth);
            display: flex;
            flex-direction: column;
        }

        .tip-card:hover {
            border-color: rgba(0, 240, 255, 0.3);
            box-shadow: 0 8px 30px rgba(0, 240, 255, 0.15);
            transform: translateY(-2px);
        }

        .tip-card-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }

        .tip-card-body {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .tip-card-category {
            display: inline-block;
            padding: 0.25rem 0.8rem;
            background: rgba(255, 0, 127, 0.15);
            color: var(--accent-pink);
            border-radius: 1rem;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            margin-bottom: 0.75rem;
            width: fit-content;
        }

        .tip-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 0.5rem;
            line-height: 1.3;
        }

        .tip-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.5;
            margin-bottom: 1.25rem;
            flex: 1;
        }

        .tip-card-stats {
            display: flex;
            align-items: center;
            gap: 1.5rem;
            padding-top: 1rem;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .tip-card-stats i {
            color: var(--accent-cyan);
            margin-right: 0.3rem;
        }

        /* Strategy Section */
        .strategy-section {
            padding: 4rem 0;
            background: rgba(0, 82, 255, 0.03);
            border-top: 1px solid rgba(0, 240, 255, 0.08);
            border-bottom: 1px solid rgba(0, 240, 255, 0.08);
        }

        .strategy-header {
            margin-bottom: 3rem;
        }

        .strategy-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 0.75rem;
        }

        .strategy-header p {
            color: var(--text-silver);
            max-width: 600px;
        }

        .strategy-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
        }

        .strategy-item {
            display: flex;
            gap: 1rem;
            align-items: flex-start;
        }

        .strategy-icon {
            width: 48px;
            height: 48px;
            min-width: 48px;
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(0, 82, 255, 0.1));
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 240, 255, 0.2);
        }

        .strategy-text h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 0.35rem;
        }

        .strategy-text p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* Data Metrics */
        .metrics-section {
            padding: 5rem 0;
        }

        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }

        .metric-card {
            text-align: left;
            padding: 2rem;
            background: rgba(13, 17, 30, 0.5);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(0, 240, 255, 0.1);
            border-radius: var(--radius-lg);
            transition: var(--transition-smooth);
        }

        .metric-card:hover {
            border-color: rgba(0, 240, 255, 0.25);
            box-shadow: 0 4px 25px rgba(0, 240, 255, 0.1);
        }

        .metric-number {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.5rem;
        }

        .metric-label {
            font-size: 0.9rem;
            color: var(--text-silver);
            font-weight: 500;
        }

        /* FAQ Section */
        .faq-section {
            padding: 4rem 0;
            border-top: 1px solid rgba(0, 240, 255, 0.08);
        }

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

        .faq-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 0.5rem;
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            max-width: 800px;
        }

        .faq-item {
            background: rgba(13, 17, 30, 0.5);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition-fast);
        }

        .faq-item:hover {
            border-color: rgba(0, 240, 255, 0.2);
        }

        .faq-question {
            padding: 1.25rem 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-white);
            font-size: 1rem;
        }

        .faq-question i {
            color: var(--accent-cyan);
            transition: transform var(--transition-fast);
        }

        .faq-answer {
            padding: 0 1.5rem 1.25rem;
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
            display: none;
        }

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

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        /* CTA Section */
        .cta-section {
            padding: 5rem 0;
            text-align: left;
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.08), rgba(0, 240, 255, 0.03));
            border-radius: var(--radius-xl);
            margin: 2rem auto;
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-inner {
            padding: 0 1rem;
            max-width: 600px;
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 1rem;
        }

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

        .btn-cta {
            display: inline-block;
            padding: 0.8rem 2.5rem;
            font-size: 1rem;
            font-weight: 700;
            color: var(--bg-primary);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            border: none;
            border-radius: var(--radius-md);
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.5);
            transition: var(--transition-smooth);
            cursor: pointer;
        }

        .btn-cta:hover {
            box-shadow: 0 10px 35px rgba(0, 82, 255, 0.8);
            transform: translateY(-2px);
        }

        /* Footer */
        .site-footer {
            background: rgba(8, 9, 15, 0.9);
            border-top: 1px solid rgba(0, 240, 255, 0.1);
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer-col h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 1rem;
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
            transition: var(--transition-fast);
        }

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

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

        /* FAB */
        .fab {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 40;
            width: 54px;
            height: 54px;
            background: rgba(13, 17, 30, 0.7);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--accent-cyan);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            transition: var(--transition-smooth);
            cursor: pointer;
        }

        .fab::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: inherit;
            padding: 2px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -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:hover {
            transform: scale(1.1);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.8);
        }

        @media (min-width: 768px) {
            .container {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
            .cta-inner {
                padding: 0 1.5rem;
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }

/* roulang page: category4 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.85);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --accent-pink: #FF007F;
            --accent-yellow: #FFFF00;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 240, 255, 0.4);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-blue: 0 0 20px rgba(0, 82, 255, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --space-xs: 0.5rem;
            --space-sm: 1rem;
            --space-md: 1.5rem;
            --space-lg: 2.5rem;
            --space-xl: 4rem;
            --space-2xl: 6rem;
            --font-title: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            background-image: 
                radial-gradient(ellipse at 20% 0%, rgba(0, 82, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 100%, rgba(0, 240, 255, 0.05) 0%, transparent 50%);
            background-attachment: fixed;
        }

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

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

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

        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: var(--space-sm);
            padding-right: var(--space-sm);
        }

        @media (min-width: 768px) {
            .container {
                padding-left: var(--space-md);
                padding-right: var(--space-md);
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: var(--space-lg);
                padding-right: var(--space-lg);
            }
        }

        /* Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 50;
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            padding: 0 var(--space-sm);
            max-width: 1280px;
            margin: 0 auto;
        }

        .logo {
            font-family: var(--font-title);
            font-size: 1.25rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--space-md);
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-silver);
            position: relative;
            padding: 0.35rem 0;
            transition: var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
            transition: width var(--transition-fast);
            border-radius: 2px;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-white);
            text-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: var(--space-xs);
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-white);
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: var(--radius-sm);
            transition: var(--transition-fast);
            cursor: pointer;
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
        }

        .btn-signup {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--bg-primary);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            border: none;
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
            transition: var(--transition-smooth);
            cursor: pointer;
        }

        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.7);
            transform: translateY(-1px);
        }

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

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.95);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                align-items: stretch;
                padding: var(--space-md);
                gap: var(--space-xs);
                border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            }

            .nav-links.mobile-open {
                display: flex;
            }

            .nav-links a {
                padding: 0.75rem 0;
                border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            }

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

            .nav-actions {
                display: flex;
                gap: var(--space-xs);
            }

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

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid rgba(0, 240, 255, 0.15);
            padding: var(--space-xl) 0 var(--space-md);
            margin-top: var(--space-2xl);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
            margin-bottom: var(--space-lg);
        }

        .footer-col h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: var(--space-sm);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            padding: 0.3rem 0;
            transition: var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
            transform: translateX(5px);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: var(--space-md);
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

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

        /* Page Specific Styles */
        .page-hero {
            position: relative;
            padding: calc(70px + var(--space-xl)) 0 var(--space-xl);
            text-align: left;
            background-image: 
                linear-gradient(180deg, transparent 0%, var(--bg-primary) 100%),
                url('/assets/images/backpic/back-3.jpg');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            min-height: 420px;
            display: flex;
            align-items: center;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(8, 9, 15, 0.95) 0%, rgba(8, 9, 15, 0.6) 60%, rgba(8, 9, 15, 0.3) 100%);
            z-index: 1;
        }

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

        .page-hero h1 {
            font-family: var(--font-title);
            font-size: clamp(1.8rem, 5vw, 3rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: var(--space-sm);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            max-width: 700px;
        }

        .page-hero .hero-desc {
            font-size: 1.1rem;
            color: var(--text-silver);
            max-width: 600px;
            margin-bottom: var(--space-md);
        }

        .hero-meta {
            display: flex;
            gap: var(--space-md);
            align-items: center;
            flex-wrap: wrap;
        }

        .hero-badge {
            display: inline-block;
            padding: 0.4rem 1rem;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-xl);
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-cyan);
        }

        .content-section {
            padding: var(--space-xl) 0;
        }

        .section-title {
            font-family: var(--font-title);
            font-size: clamp(1.5rem, 4vw, 2.2rem);
            font-weight: 700;
            margin-bottom: var(--space-sm);
            color: var(--text-white);
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--text-muted);
            margin-bottom: var(--space-lg);
            max-width: 700px;
        }

        .device-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: var(--space-md);
            margin: var(--space-lg) 0;
        }

        .device-card {
            background: rgba(13, 17, 30, 0.5);
            border: 1px solid rgba(0, 240, 255, 0.15);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            transition: var(--transition-smooth);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            display: flex;
            flex-direction: column;
            gap: var(--space-xs);
        }

        .device-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
            transform: translateY(-2px);
        }

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

        .device-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-white);
        }

        .device-card .specs {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        .device-card .specs li {
            list-style: none;
            padding: 0.2rem 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .device-card .specs li i {
            color: var(--accent-cyan);
            font-size: 0.8rem;
            width: 16px;
            text-align: center;
        }

        .device-card .status {
            display: inline-block;
            padding: 0.2rem 0.8rem;
            font-size: 0.8rem;
            font-weight: 600;
            border-radius: var(--radius-xl);
            margin-top: auto;
            align-self: flex-start;
            background: rgba(0, 255, 0, 0.1);
            color: #00FF88;
            border: 1px solid rgba(0, 255, 0, 0.3);
        }

        .optimize-panel {
            background: rgba(13, 17, 30, 0.6);
            border: 1px solid rgba(0, 240, 255, 0.2);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            margin: var(--space-lg) 0;
        }

        .optimize-panel h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: var(--space-sm);
            color: var(--text-white);
        }

        .optimize-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: var(--space-md);
            margin-top: var(--space-md);
        }

        .optimize-item {
            display: flex;
            align-items: flex-start;
            gap: var(--space-sm);
        }

        .optimize-item i {
            font-size: 1.4rem;
            color: var(--accent-cyan);
            margin-top: 0.2rem;
        }

        .optimize-item h4 {
            font-weight: 600;
            margin-bottom: 0.2rem;
            color: var(--text-white);
        }

        .optimize-item p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: var(--space-lg) 0;
            font-size: 0.9rem;
        }

        .comparison-table th {
            background: rgba(0, 82, 255, 0.2);
            padding: 0.8rem 1rem;
            text-align: left;
            font-weight: 600;
            color: var(--accent-cyan);
            border-bottom: 1px solid var(--border-glow);
        }

        .comparison-table td {
            padding: 0.8rem 1rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            color: var(--text-silver);
        }

        .comparison-table tr:hover td {
            background: rgba(255, 255, 255, 0.02);
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
            margin: var(--space-lg) 0;
        }

        .faq-item {
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-md);
            overflow: hidden;
            background: rgba(13, 17, 30, 0.4);
            transition: var(--transition-fast);
        }

        .faq-item summary {
            padding: var(--space-md);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-white);
            list-style: none;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary i {
            transition: transform 0.3s;
            color: var(--accent-cyan);
            font-size: 0.8rem;
        }

        .faq-item[open] summary i {
            transform: rotate(180deg);
        }

        .faq-item .faq-content {
            padding: 0 var(--space-md) var(--space-md);
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        .cta-section {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.1), rgba(0, 240, 255, 0.05));
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            text-align: left;
            margin: var(--space-xl) 0;
        }

        .cta-section h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: var(--space-sm);
            color: var(--text-white);
        }

        .cta-section p {
            color: var(--text-silver);
            margin-bottom: var(--space-md);
            max-width: 600px;
        }

        .btn-cta-lg {
            display: inline-block;
            padding: 0.8rem 2rem;
            font-size: 1rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            color: var(--bg-primary);
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 20px rgba(0, 82, 255, 0.5);
            transition: var(--transition-smooth);
            border: none;
            cursor: pointer;
        }

        .btn-cta-lg:hover {
            box-shadow: 0 6px 30px rgba(0, 82, 255, 0.8);
            transform: translateY(-2px);
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 28px;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 2px solid transparent;
            border-image: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue)) 1;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-white);
            font-size: 1.5rem;
            cursor: pointer;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
            transition: all 0.3s;
            animation: fab-glow 2s infinite alternate;
            text-decoration: none;
        }

        @keyframes fab-glow {
            from { box-shadow: 0 0 12px rgba(0, 240, 255, 0.3); }
            to { box-shadow: 0 0 25px rgba(0, 240, 255, 0.7); }
        }

        .fab-left:hover {
            transform: scale(1.15);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.9);
        }

        @media (max-width: 768px) {
            .comparison-table-wrapper {
                overflow-x: auto;
            }

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

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

/* roulang page: category3 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.85);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --accent-pink: #FF007F;
            --accent-yellow: #FFFF00;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 240, 255, 0.4);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-blue: 0 0 20px rgba(0, 82, 255, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --space-xs: 0.5rem;
            --space-sm: 1rem;
            --space-md: 1.5rem;
            --space-lg: 2.5rem;
            --space-xl: 4rem;
            --space-2xl: 6rem;
            --font-title: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            background-image: 
                radial-gradient(ellipse at 20% 0%, rgba(0, 82, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 100%, rgba(0, 240, 255, 0.05) 0%, transparent 50%);
            background-attachment: fixed;
            margin: 0;
            padding: 0;
        }

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

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

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

        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: var(--space-sm);
            padding-right: var(--space-sm);
        }

        @media (min-width: 768px) {
            .container {
                padding-left: var(--space-md);
                padding-right: var(--space-md);
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: var(--space-lg);
                padding-right: var(--space-lg);
            }
        }

        /* Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 50;
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            padding: 0 var(--space-sm);
            max-width: 1280px;
            margin: 0 auto;
        }

        .logo {
            font-family: var(--font-title);
            font-size: 1.25rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--space-md);
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-silver);
            position: relative;
            padding: 0.35rem 0;
            transition: var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
            transition: width var(--transition-fast);
            border-radius: 2px;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-white);
            text-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: var(--space-xs);
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-white);
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: var(--radius-sm);
            transition: var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
        }

        .btn-signup {
            padding: 0.5rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--bg-primary);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            border: none;
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
            transition: var(--transition-smooth);
        }

        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.7);
            transform: translateY(-1px);
        }

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

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: var(--space-md);
                gap: var(--space-sm);
                border-bottom: 1px solid rgba(0, 240, 255, 0.2);
                z-index: 49;
            }

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

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

            .header-inner {
                justify-content: space-between;
            }

            .nav-actions {
                gap: var(--space-xs);
            }

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

        /* Hero Section */
        .hero-section {
            padding-top: 120px;
            padding-bottom: var(--space-xl);
            position: relative;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-xl);
            align-items: center;
        }

        .hero-content {
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
        }

        .hero-title {
            font-family: var(--font-title);
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1.2;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 1.1rem;
            color: var(--text-silver);
            line-height: 1.7;
        }

        .hero-stats {
            display: flex;
            gap: var(--space-lg);
            margin-top: var(--space-sm);
        }

        .stat-item {
            display: flex;
            flex-direction: column;
            gap: 0.25rem;
        }

        .stat-number {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--accent-cyan);
            text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
        }

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

        .hero-image-wrapper {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
            border: 2px solid var(--border-glow);
        }

        .hero-image-wrapper img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }

        .hero-image-wrapper::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.2), rgba(255, 0, 127, 0.1));
            z-index: 1;
            pointer-events: none;
        }

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

            .hero-title {
                font-size: 2rem;
            }

            .hero-section {
                padding-top: 100px;
            }

            .hero-stats {
                flex-direction: column;
                gap: var(--space-sm);
            }
        }

        /* Technique Cards Section */
        .section-block {
            padding: var(--space-xl) 0;
        }

        .section-title {
            font-family: var(--font-title);
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: var(--space-sm);
            color: var(--text-white);
        }

        .section-desc {
            color: var(--text-silver);
            font-size: 1rem;
            margin-bottom: var(--space-lg);
            max-width: 700px;
        }

        .technique-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-lg);
        }

        .technique-card {
            background: var(--bg-card);
            border: 1px solid rgba(0, 240, 255, 0.2);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }

        .technique-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
            transform: scaleX(0);
            transition: transform var(--transition-smooth);
        }

        .technique-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transform: translateY(-4px);
        }

        .technique-card:hover::before {
            transform: scaleX(1);
        }

        .technique-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--text-white);
            margin-bottom: var(--space-md);
            box-shadow: 0 0 15px rgba(0, 82, 255, 0.3);
        }

        .technique-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: var(--space-xs);
            color: var(--text-white);
        }

        .technique-card p {
            color: var(--text-silver);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        .technique-tags {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-xs);
            margin-top: var(--space-sm);
        }

        .tag {
            padding: 0.3rem 0.8rem;
            border-radius: 9999px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 240, 255, 0.3);
            background: rgba(0, 240, 255, 0.05);
        }

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

            .section-title {
                font-size: 1.6rem;
            }
        }

        /* Comparison Table */
        .comparison-section {
            background: var(--bg-secondary);
            border-radius: var(--radius-xl);
            padding: var(--space-xl) var(--space-lg);
            margin: var(--space-lg) 0;
            border: 1px solid rgba(0, 240, 255, 0.1);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: var(--space-lg);
        }

        .comparison-table th {
            text-align: left;
            padding: var(--space-sm);
            font-weight: 700;
            color: var(--accent-cyan);
            border-bottom: 2px solid var(--border-glow);
            font-size: 1rem;
        }

        .comparison-table td {
            padding: var(--space-sm);
            color: var(--text-silver);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            font-size: 0.95rem;
        }

        .comparison-table .highlight-row {
            background: rgba(0, 240, 255, 0.03);
        }

        .badge-success {
            color: #10B981;
            font-weight: 600;
        }

        .badge-warning {
            color: var(--accent-yellow);
            font-weight: 600;
        }

        @media (max-width: 768px) {
            .comparison-table {
                font-size: 0.85rem;
            }

            .comparison-section {
                padding: var(--space-md);
                overflow-x: auto;
            }
        }

        /* Process Steps */
        .process-list {
            list-style: none;
            padding: 0;
            margin: var(--space-lg) 0;
        }

        .process-item {
            display: flex;
            gap: var(--space-md);
            padding: var(--space-md) 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .process-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.2rem;
            flex-shrink: 0;
            color: var(--bg-primary);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
        }

        .process-content h4 {
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 0.25rem;
        }

        .process-content p {
            color: var(--text-silver);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-pink));
            border-radius: var(--radius-xl);
            padding: var(--space-xl) var(--space-lg);
            text-align: left;
            margin: var(--space-xl) 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.jpg') center/cover;
            opacity: 0.15;
            z-index: 0;
        }

        .cta-content {
            position: relative;
            z-index: 1;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: var(--space-lg);
            flex-wrap: wrap;
        }

        .cta-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: var(--space-sm);
        }

        .cta-desc {
            color: rgba(255, 255, 255, 0.9);
            font-size: 1rem;
        }

        .btn-cta {
            padding: 0.8rem 2rem;
            font-size: 1rem;
            font-weight: 700;
            background: var(--text-white);
            color: var(--accent-blue);
            border: none;
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            transition: var(--transition-smooth);
            white-space: nowrap;
        }

        .btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
        }

        @media (max-width: 768px) {
            .cta-content {
                flex-direction: column;
                text-align: left;
            }

            .cta-title {
                font-size: 1.4rem;
            }
        }

        /* FAQ Section */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid rgba(0, 240, 255, 0.1);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            transition: var(--transition-smooth);
            cursor: pointer;
        }

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

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

        .faq-answer {
            color: var(--text-silver);
            font-size: 0.95rem;
            margin-top: var(--space-sm);
            line-height: 1.6;
        }

        .faq-icon {
            color: var(--accent-cyan);
            transition: transform var(--transition-fast);
        }

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

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid rgba(0, 240, 255, 0.15);
            padding: var(--space-xl) 0;
            margin-top: var(--space-xl);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
            margin-bottom: var(--space-lg);
        }

        .footer-col h4 {
            font-weight: 700;
            margin-bottom: var(--space-sm);
            color: var(--text-white);
            font-size: 1.1rem;
        }

        .footer-col a {
            display: block;
            color: var(--text-silver);
            font-size: 0.9rem;
            padding: 0.3rem 0;
            transition: var(--transition-fast);
        }

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

        .footer-bottom {
            text-align: center;
            padding-top: var(--space-md);
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            color: var(--text-muted);
        }

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

        /* FAB */
        .fab {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 9999px;
            background: rgba(8, 9, 15, 0.7);
            backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(8,9,15,0.7), rgba(8,9,15,0.7)), linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transition: var(--transition-smooth);
            cursor: pointer;
            animation: pulse-fab 2s infinite;
        }

        @keyframes pulse-fab {
            0%, 100% { box-shadow: 0 0 15px rgba(0, 240, 255, 0.5); }
            50% { box-shadow: 0 0 25px rgba(255, 0, 127, 0.7); }
        }

        .fab:hover {
            transform: scale(1.1);
            box-shadow: 0 0 30px rgba(255, 0, 127, 0.8);
            color: var(--accent-pink);
        }

        .notification-dot {
            position: absolute;
            top: 8px;
            right: 8px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--accent-pink);
            box-shadow: 0 0 8px var(--accent-pink);
            animation: blink 1s infinite;
        }

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