/* roulang page: index */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #10162B;
            --bg-card: rgba(16, 28, 60, 0.6);
            --accent: #2563EB;
            --accent-glow: #38BDF8;
            --accent-hover: #1D4ED8;
            --text-primary: #F8FAFC;
            --text-secondary: #D1D5DB;
            --text-muted: #9CA3AF;
            --border-color: rgba(37, 99, 235, 0.3);
            --border-glow: rgba(56, 189, 248, 0.5);
            --shadow-glow: 0 0 15px rgba(37, 99, 235, 0.4);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --font-sans: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-display: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 20% 10%, rgba(37, 99, 235, 0.08) 0%, transparent 70%),
                radial-gradient(ellipse at 80% 90%, rgba(56, 189, 248, 0.05) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }

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

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

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

        button,
        .button {
            cursor: pointer;
            font-family: var(--font-sans);
            border: none;
            outline: none;
            transition: all var(--transition-smooth);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
            position: relative;
            z-index: 1;
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 26, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(37, 99, 235, 0.25);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
            transition: background var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-family: var(--font-display);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            text-decoration: none;
            white-space: nowrap;
        }

        .logo i {
            font-size: 1.6rem;
            color: var(--accent-glow);
            filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.6));
        }

        .logo span {
            background: linear-gradient(135deg, #F8FAFC 0%, #38BDF8 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 0.15rem;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 0.6rem 1.1rem;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.92rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .main-nav a:hover,
        .main-nav a.active {
            color: var(--text-primary);
            background: rgba(37, 99, 235, 0.15);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent-glow);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            background: transparent;
            color: var(--text-primary);
            border: 1.5px solid rgba(37, 99, 235, 0.5);
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            transition: all var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-glow);
            box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
            background: rgba(37, 99, 235, 0.1);
        }

        .btn-signup {
            padding: 0.5rem 1.4rem;
            background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
            color: #FFF;
            border: none;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            box-shadow: 0 0 15px rgba(37, 99, 235, 0.5);
            transition: all var(--transition-fast);
        }

        .btn-signup:hover {
            box-shadow: 0 0 25px rgba(56, 189, 248, 0.7);
            transform: translateY(-1px);
            background: linear-gradient(135deg, #1D4ED8 0%, #1E40AF 100%);
        }

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

        /* Mobile Nav */
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: rgba(10, 14, 26, 0.98);
            backdrop-filter: blur(24px);
            border-top: 1px solid var(--border-color);
            padding: 1rem 1.5rem;
        }

        .mobile-nav a {
            padding: 0.8rem 0;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 1rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .mobile-nav a:hover {
            color: var(--text-primary);
        }

        .mobile-nav .btn-login,
        .mobile-nav .btn-signup {
            display: block;
            text-align: center;
            margin-top: 0.6rem;
            padding: 0.7rem;
            border-radius: var(--radius-sm);
        }

        /* Hero Section */
        .hero-section {
            position: relative;
            min-height: 85vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            background-attachment: fixed;
            overflow: hidden;
            margin-top: 70px;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10, 14, 26, 0.75) 0%, rgba(10, 14, 26, 0.9) 50%, var(--bg-primary) 100%);
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 900px;
            padding: 2rem 1.5rem;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(37, 99, 235, 0.2);
            border: 1px solid var(--border-color);
            color: var(--accent-glow);
            padding: 0.5rem 1.4rem;
            border-radius: 2rem;
            font-weight: 600;
            font-size: 0.88rem;
            letter-spacing: 0.04em;
            margin-bottom: 1.5rem;
            box-shadow: 0 0 15px rgba(37, 99, 235, 0.2);
        }

        .hero-title {
            font-family: var(--font-display);
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            font-weight: 800;
            line-height: 1.15;
            color: var(--text-primary);
            margin-bottom: 1.2rem;
            text-shadow: 0 0 30px rgba(37, 99, 235, 0.5);
        }

        .hero-title span {
            background: linear-gradient(135deg, #38BDF8 0%, #2563EB 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.4));
        }

        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 2rem;
            line-height: 1.7;
        }

        .hero-actions {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn-hero-primary {
            padding: 0.9rem 2.4rem;
            background: linear-gradient(135deg, #2563EB 0%, #38BDF8 100%);
            color: #FFF;
            border: none;
            border-radius: 3rem;
            font-weight: 700;
            font-size: 1.05rem;
            box-shadow: 0 0 30px rgba(56, 189, 248, 0.5);
            transition: all var(--transition-smooth);
        }

        .btn-hero-primary:hover {
            box-shadow: 0 0 45px rgba(56, 189, 248, 0.75);
            transform: translateY(-3px);
        }

        .btn-hero-secondary {
            padding: 0.9rem 2.4rem;
            background: transparent;
            color: var(--text-primary);
            border: 2px solid rgba(255, 255, 255, 0.4);
            border-radius: 3rem;
            font-weight: 600;
            font-size: 1.05rem;
            transition: all var(--transition-smooth);
        }

        .btn-hero-secondary:hover {
            border-color: var(--accent-glow);
            box-shadow: 0 0 20px rgba(56, 189, 248, 0.3);
        }

        /* Countdown Bar */
        .countdown-section {
            background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
            padding: 2.5rem 0;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .countdown-inner {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
            text-align: center;
        }

        .countdown-label {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-secondary);
        }

        .countdown-timer {
            display: flex;
            gap: 1.2rem;
        }

        .countdown-item {
            background: rgba(37, 99, 235, 0.15);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 0.8rem 1.2rem;
            min-width: 70px;
        }

        .countdown-num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-primary);
            line-height: 1;
        }

        .countdown-unit {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 0.25rem;
        }

        /* Section Base */
        .section {
            padding: 5rem 0;
        }

        .section-header {
            margin-bottom: 3rem;
            max-width: 700px;
        }

        .section-header.centered {
            text-align: center;
            margin-left: auto;
            margin-right: auto;
        }

        .section-badge {
            display: inline-block;
            background: rgba(37, 99, 235, 0.15);
            border: 1px solid var(--border-color);
            color: var(--accent-glow);
            padding: 0.3rem 1rem;
            border-radius: 1rem;
            font-size: 0.82rem;
            font-weight: 600;
            margin-bottom: 0.8rem;
        }

        .section-title {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.2;
            margin-bottom: 0.8rem;
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* Highlights Grid */
        .highlights-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 1.8rem;
        }

        .highlight-card {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .highlight-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, #2563EB, #38BDF8);
            opacity: 0;
            transition: opacity var(--transition-smooth);
        }

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

        .highlight-card:hover {
            border-color: var(--border-glow);
            box-shadow: 0 8px 30px rgba(37, 99, 235, 0.2);
            transform: translateY(-4px);
        }

        .highlight-icon {
            width: 56px;
            height: 56px;
            background: rgba(37, 99, 235, 0.2);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent-glow);
            margin-bottom: 1.2rem;
            box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
        }

        .highlight-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
        }

        .highlight-card p {
            font-size: 0.93rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Rewards Grid */
        .rewards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 1.5rem;
        }

        .reward-card {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 2rem 1.5rem;
            text-align: center;
            transition: all var(--transition-smooth);
        }

        .reward-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }

        .reward-icon {
            font-size: 2.8rem;
            margin-bottom: 1rem;
            filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.5));
        }

        .reward-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 0.4rem;
        }

        .reward-card p {
            font-size: 0.93rem;
            color: var(--text-secondary);
        }

        .reward-value {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-glow);
            margin: 0.6rem 0;
            text-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
        }

        /* Steps */
        .steps-section {
            background: var(--bg-secondary);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 2rem;
            counter-reset: step;
        }

        .step-item {
            position: relative;
            padding-left: 3rem;
            border-left: 2px solid var(--border-color);
            transition: all var(--transition-smooth);
        }

        .step-item:hover {
            border-left-color: var(--accent-glow);
        }

        .step-num {
            position: absolute;
            left: -24px;
            top: 0;
            width: 46px;
            height: 46px;
            background: linear-gradient(135deg, #2563EB, #1D4ED8);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
            color: #FFF;
            box-shadow: 0 0 15px rgba(37, 99, 235, 0.5);
        }

        .step-item h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
        }

        .step-item p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Testimonials */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 1.5rem;
        }

        .testimonial-card {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 1.8rem;
        }

        .testimonial-header {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 1rem;
        }

        .testimonial-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, #2563EB, #38BDF8);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            color: #FFF;
        }

        .testimonial-name {
            font-weight: 700;
            color: var(--text-primary);
        }

        .testimonial-date {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .testimonial-text {
            font-size: 0.94rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        .testimonial-stars {
            color: #FBBF24;
            margin-bottom: 0.6rem;
        }

        /* CMS List */
        .cms-list {
            list-style: none;
        }

        .cms-item {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 1rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: all var(--transition-fast);
        }

        .cms-item:hover {
            background: rgba(37, 99, 235, 0.05);
            padding-left: 0.5rem;
            border-radius: var(--radius-sm);
        }

        .cms-thumb {
            width: 70px;
            height: 50px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg-secondary);
        }

        .cms-info {
            flex: 1;
            min-width: 0;
        }

        .cms-title {
            font-weight: 600;
            color: var(--text-primary);
            font-size: 0.95rem;
            display: block;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .cms-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 0.2rem;
        }

        /* Signup CTA */
        .cta-section {
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.2) 0%, rgba(10, 14, 26, 0.9) 100%);
            padding: 4rem 0;
            text-align: center;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        /* Security Badges */
        .security-grid {
            display: flex;
            justify-content: center;
            gap: 3rem;
            flex-wrap: wrap;
            align-items: center;
        }

        .security-item {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.94rem;
        }

        .security-item i {
            font-size: 1.4rem;
            color: var(--accent-glow);
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 3rem 0 1.5rem;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

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

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

        .footer-col a {
            display: block;
            color: var(--text-muted);
            padding: 0.3rem 0;
            font-size: 0.88rem;
            transition: color var(--transition-fast);
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.82rem;
        }

        .footer-payments {
            display: flex;
            gap: 0.6rem;
            flex-wrap: wrap;
            margin-top: 0.8rem;
            justify-content: center;
        }

        .payment-badge {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 0.4rem 0.9rem;
            border-radius: var(--radius-sm);
            font-size: 0.82rem;
            color: var(--text-muted);
        }

        /* FAB */
        .fab-floating {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            width: 56px;
            height: 56px;
            background: rgba(10, 14, 26, 0.8);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            border-image: linear-gradient(135deg, #2563EB, #38BDF8) 1;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 25px rgba(56, 189, 248, 0.45);
            transition: all var(--transition-smooth);
            cursor: pointer;
        }

        .fab-floating:hover {
            transform: scale(1.1);
            box-shadow: 0 0 35px rgba(56, 189, 248, 0.7);
        }

        .fab-floating i {
            font-size: 1.4rem;
            color: var(--accent-glow);
        }

        .fab-badge {
            position: absolute;
            top: -4px;
            right: -4px;
            width: 14px;
            height: 14px;
            background: #EF4444;
            border-radius: 50%;
            animation: pulse-dot 1.5s infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.6);
            }
            50% {
                box-shadow: 0 0 0 8px rgba(239, 68, 68, 0);
            }
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .header-inner {
                height: 60px;
            }
            .hero-section {
                min-height: 70vh;
                margin-top: 60px;
            }
            .section {
                padding: 3.5rem 0;
            }
        }

        @media (max-width: 768px) {
            .main-nav,
            .nav-actions {
                display: none;
            }
            .mobile-menu-toggle {
                display: block;
            }
            .mobile-nav.active {
                display: flex;
            }
            .hero-title {
                font-size: 1.9rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .countdown-timer {
                gap: 0.6rem;
            }
            .countdown-item {
                padding: 0.6rem 0.8rem;
                min-width: 55px;
            }
            .countdown-num {
                font-size: 1.5rem;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .security-grid {
                gap: 1.5rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 1rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-title {
                font-size: 1.6rem;
            }
            .testimonials-grid {
                grid-template-columns: 1fr;
            }
            .rewards-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

/* roulang page: article */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #10162B;
            --bg-card: rgba(16, 28, 60, 0.6);
            --accent: #2563EB;
            --accent-glow: #38BDF8;
            --accent-hover: #1D4ED8;
            --text-primary: #F8FAFC;
            --text-secondary: #D1D5DB;
            --text-muted: #9CA3AF;
            --border-color: rgba(37, 99, 235, 0.3);
            --border-glow: rgba(56, 189, 248, 0.5);
            --shadow-glow: 0 0 15px rgba(37, 99, 235, 0.4);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --font-sans: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-display: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --hero-glow: radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.12) 0%, transparent 60%);
            --card-bg-solid: rgba(16, 28, 60, 0.7);
            --glass-blur: blur(20px);
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
            position: relative;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 20% 10%, rgba(37, 99, 235, 0.08) 0%, transparent 70%),
                radial-gradient(ellipse at 80% 90%, rgba(56, 189, 248, 0.05) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }

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

        a:hover {
            color: var(--accent-hover);
            text-decoration: none;
        }

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

        button,
        .button {
            cursor: pointer;
            font-family: var(--font-sans);
            border: none;
            outline: none;
            transition: all var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.4rem;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
            position: relative;
            z-index: 1;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text-primary);
            font-family: var(--font-display);
            line-height: 1.3;
        }

        h1 {
            font-size: 2.4rem;
            font-weight: 800;
            letter-spacing: -0.02em;
        }

        h2 {
            font-size: 1.8rem;
            font-weight: 700;
            letter-spacing: -0.015em;
        }

        h3 {
            font-size: 1.35rem;
            font-weight: 600;
        }

        p {
            margin-bottom: 1rem;
            color: var(--text-secondary);
        }

        ul, ol {
            padding-left: 1.5rem;
            margin-bottom: 1rem;
            color: var(--text-secondary);
        }

        li {
            margin-bottom: 0.5rem;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 26, 0.85);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-family: var(--font-display);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            text-decoration: none;
            white-space: nowrap;
        }

        .logo i {
            font-size: 1.6rem;
            color: var(--accent-glow);
            filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.6));
        }

        .logo span {
            background: linear-gradient(135deg, #F8FAFC 0%, #38BDF8 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 0.15rem;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 0.6rem 1.1rem;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.92rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .main-nav a:hover,
        .main-nav a.active {
            color: var(--text-primary);
            background: rgba(37, 99, 235, 0.15);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent-glow);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            background: transparent;
            color: var(--text-primary);
            border: 1.5px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            transition: all var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-glow);
            box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
            background: rgba(37, 99, 235, 0.1);
            color: var(--text-primary);
        }

        .btn-signup {
            padding: 0.5rem 1.4rem;
            background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
            color: #FFF;
            border: none;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            box-shadow: 0 0 15px rgba(37, 99, 235, 0.4);
        }

        .btn-signup:hover {
            box-shadow: 0 0 25px rgba(56, 189, 248, 0.6);
            transform: translateY(-1px);
            color: #FFF;
        }

        .mobile-menu-toggle {
            display: none;
            background: transparent;
            color: var(--text-primary);
            font-size: 1.6rem;
            padding: 0.25rem;
        }

        .page-wrapper {
            padding-top: 90px;
        }

        /* Article Hero */
        .article-hero {
            background: var(--hero-glow);
            padding: 3.5rem 0 2.5rem;
            border-bottom: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }

        .article-hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 1.2rem;
            flex-wrap: wrap;
        }

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

        .breadcrumb i {
            font-size: 0.7rem;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 1rem;
            flex-wrap: wrap;
            margin-bottom: 1rem;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .article-meta .category-tag {
            background: rgba(37, 99, 235, 0.2);
            color: var(--accent-glow);
            padding: 0.25rem 0.8rem;
            border-radius: 999px;
            font-weight: 500;
            font-size: 0.8rem;
            border: 1px solid var(--border-color);
        }

        .article-body {
            padding: 3rem 0;
            position: relative;
        }

        .article-content-wrapper {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2.5rem;
            align-items: start;
        }

        .article-main {
            min-width: 0;
        }

        .article-sidebar {
            position: sticky;
            top: 100px;
        }

        /* Article Content Styling */
        .prose {
            font-size: 1rem;
            line-height: 1.75;
            color: var(--text-secondary);
        }

        .prose h2 {
            font-size: 1.6rem;
            margin-top: 2.5rem;
            margin-bottom: 1.2rem;
            color: var(--text-primary);
            border-left: 4px solid var(--accent);
            padding-left: 1rem;
        }

        .prose h3 {
            font-size: 1.3rem;
            margin-top: 2rem;
            margin-bottom: 0.8rem;
            color: var(--text-primary);
        }

        .prose p {
            margin-bottom: 1.2rem;
        }

        .prose ul, .prose ol {
            margin-bottom: 1.2rem;
        }

        .prose img {
            border-radius: var(--radius-md);
            margin: 1.5rem 0;
            box-shadow: var(--shadow-card);
        }

        .prose table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            margin: 1.5rem 0;
            border-radius: var(--radius-sm);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .prose th {
            background: rgba(37, 99, 235, 0.25);
            color: var(--text-primary);
            font-weight: 600;
            padding: 0.8rem 1rem;
            text-align: left;
            font-size: 0.9rem;
        }

        .prose td {
            background: rgba(16, 28, 60, 0.4);
            color: var(--text-secondary);
            padding: 0.7rem 1rem;
            border-bottom: 1px solid rgba(255,255,255,0.05);
            font-size: 0.9rem;
        }

        .prose blockquote {
            border-left: 3px solid var(--accent-glow);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            background: rgba(37, 99, 235, 0.08);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }

        .sidebar-card {
            background: var(--card-bg-solid);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-card);
        }

        .sidebar-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 1rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }

        .sidebar-cta {
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.3) 0%, rgba(29, 78, 216, 0.2) 100%);
            border: 1px solid var(--border-glow);
            text-align: center;
        }

        .sidebar-cta .btn-signup {
            width: 100%;
            padding: 0.8rem 1.5rem;
            font-size: 1rem;
            margin-top: 0.5rem;
        }

        .sidebar-posts-list {
            list-style: none;
            padding: 0;
        }

        .sidebar-posts-list li {
            padding: 0.6rem 0;
            border-bottom: 1px solid rgba(255,255,255,0.04);
        }

        .sidebar-posts-list li:last-child {
            border-bottom: none;
        }

        .sidebar-posts-list a {
            font-size: 0.9rem;
            color: var(--text-secondary);
            display: flex;
            align-items: flex-start;
            gap: 0.5rem;
            transition: color var(--transition-fast);
        }

        .sidebar-posts-list a:hover {
            color: var(--accent-glow);
        }

        .sidebar-posts-list a i {
            color: var(--accent);
            font-size: 0.5rem;
            margin-top: 0.5em;
        }

        .not-found-message {
            text-align: center;
            padding: 4rem 1rem;
            background: var(--bg-secondary);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
        }

        .not-found-message i {
            font-size: 3rem;
            color: var(--accent-glow);
            margin-bottom: 1rem;
        }

        .btn-back-home {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
            color: #FFF;
            padding: 0.75rem 1.8rem;
            border-radius: var(--radius-sm);
            font-weight: 600;
            margin-top: 1rem;
            box-shadow: var(--shadow-glow);
        }

        .btn-back-home:hover {
            color: #FFF;
            box-shadow: 0 0 25px rgba(56, 189, 248, 0.5);
            transform: translateY(-2px);
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
            position: relative;
            z-index: 1;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 2.5rem;
            margin-bottom: 2rem;
        }

        .footer-col h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-primary);
        }

        .footer-col p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 1rem;
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.88rem;
            padding: 0.35rem 0;
            transition: color var(--transition-fast);
        }

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

        .footer-payments {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
            margin-top: 0.8rem;
        }

        .payment-badge {
            background: rgba(37, 99, 235, 0.15);
            border: 1px solid var(--border-color);
            color: var(--accent-glow);
            padding: 0.3rem 0.7rem;
            border-radius: 999px;
            font-size: 0.75rem;
            font-weight: 500;
        }

        .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: 0.82rem;
        }

        /* FAB */
        .fab-container {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .fab-main {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, #1D4ED8 0%, #2563EB 100%);
            border: 2px solid var(--accent-glow);
            box-shadow: 0 0 20px rgba(56, 189, 248, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #FFF;
            font-size: 1.5rem;
            transition: all var(--transition-smooth);
            cursor: pointer;
            position: relative;
            animation: fab-breathe 3s ease-in-out infinite;
        }

        .fab-notification {
            position: absolute;
            top: -4px;
            right: -4px;
            width: 16px;
            height: 16px;
            background: #EF4444;
            border-radius: 50%;
            border: 2px solid var(--bg-primary);
            animation: pulse-dot 2s infinite;
        }

        @keyframes fab-breathe {
            0%, 100% { box-shadow: 0 0 20px rgba(56, 189, 248, 0.4); }
            50% { box-shadow: 0 0 30px rgba(56, 189, 248, 0.7); }
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }

        .fab-main:hover {
            transform: scale(1.1);
            box-shadow: 0 0 35px rgba(56, 189, 248, 0.8);
            background: linear-gradient(135deg, #2563EB 0%, #38BDF8 100%);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .article-content-wrapper {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            h1 { font-size: 1.8rem; }
            h2 { font-size: 1.4rem; }
            .main-nav {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: rgba(10, 14, 26, 0.98);
                flex-direction: column;
                padding: 1rem;
                border-bottom: 1px solid var(--border-color);
                backdrop-filter: blur(15px);
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                justify-content: flex-start;
            }
            .mobile-menu-toggle {
                display: block;
            }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .nav-actions .btn-login {
                display: none;
            }
            .fab-container {
                bottom: 3rem;
            }
        }

        @media (max-width: 520px) {
            .header-inner {
                padding: 0 1rem;
            }
            .logo {
                font-size: 0.95rem;
            }
            .logo i {
                font-size: 1.3rem;
            }
            h1 {
                font-size: 1.6rem;
            }
            .article-hero {
                padding: 2rem 0 1.5rem;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #10162B;
            --bg-card: rgba(16, 28, 60, 0.6);
            --accent: #2563EB;
            --accent-glow: #38BDF8;
            --accent-hover: #1D4ED8;
            --text-primary: #F8FAFC;
            --text-secondary: #D1D5DB;
            --text-muted: #9CA3AF;
            --border-color: rgba(37, 99, 235, 0.3);
            --border-glow: rgba(56, 189, 248, 0.5);
            --shadow-glow: 0 0 15px rgba(37, 99, 235, 0.4);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --font-sans: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-display: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 20% 10%, rgba(37, 99, 235, 0.08) 0%, transparent 70%),
                radial-gradient(ellipse at 80% 90%, rgba(56, 189, 248, 0.05) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }

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

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

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

        button,
        .button {
            cursor: pointer;
            font-family: var(--font-sans);
            border: none;
            outline: none;
            transition: all var(--transition-smooth);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
            position: relative;
            z-index: 1;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 26, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(37, 99, 235, 0.25);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
            transition: background var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-family: var(--font-display);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            text-decoration: none;
            white-space: nowrap;
        }

        .logo i {
            font-size: 1.6rem;
            color: var(--accent-glow);
            filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.6));
        }

        .logo span {
            background: linear-gradient(135deg, #F8FAFC 0%, #38BDF8 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 0.15rem;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 0.6rem 1.1rem;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.92rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .main-nav a:hover,
        .main-nav a.active {
            color: var(--text-primary);
            background: rgba(37, 99, 235, 0.15);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent-glow);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            background: transparent;
            color: var(--text-primary);
            border: 1.5px solid rgba(37, 99, 235, 0.5);
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            transition: all var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-glow);
            box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
            background: rgba(37, 99, 235, 0.1);
        }

        .btn-signup {
            padding: 0.5rem 1.4rem;
            background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
            color: #FFF;
            border: none;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            box-shadow: 0 0 15px rgba(37, 99, 235, 0.5);
        }

        .btn-signup:hover {
            box-shadow: 0 0 25px rgba(56, 189, 248, 0.7);
            transform: translateY(-1px);
        }

        .hamburger {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.6rem;
            cursor: pointer;
            padding: 0.4rem;
        }

        main {
            padding-top: 70px;
            position: relative;
            z-index: 1;
        }

        .page-hero {
            position: relative;
            padding: 3.5rem 0 2.5rem;
            background: linear-gradient(180deg, rgba(16,22,43,0.9) 0%, var(--bg-primary) 100%);
            overflow: hidden;
        }
        .page-hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: url('/assets/images/backpic/back-1.jpg');
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 0;
        }
        .page-hero-content {
            position: relative;
            z-index: 2;
        }
        .page-hero h1 {
            font-family: var(--font-display);
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 1rem;
            color: var(--text-primary);
        }
        .page-hero .subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 650px;
            line-height: 1.7;
        }

        .section-block {
            padding: 3.5rem 0;
        }
        .section-block:nth-child(even) {
            background: rgba(16, 22, 43, 0.4);
        }
        .section-title {
            font-family: var(--font-display);
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 2rem;
            color: var(--text-primary);
            position: relative;
            display: inline-block;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 50px;
            height: 3px;
            background: var(--accent-glow);
            margin-top: 0.6rem;
            border-radius: 2px;
            box-shadow: 0 0 10px rgba(56,189,248,0.5);
        }

        .card-glass {
            background: rgba(16, 28, 60, 0.5);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            border: 1px solid rgba(37, 99, 235, 0.25);
            border-radius: var(--radius-lg);
            padding: 2rem;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
        }
        .card-glass:hover {
            border-color: var(--accent-glow);
            box-shadow: 0 8px 30px rgba(37,99,235,0.3);
            transform: translateY(-2px);
        }

        .rule-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
        }
        .rule-card {
            background: rgba(10,14,26,0.8);
            border-left: 4px solid var(--accent);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            transition: var(--transition-smooth);
        }
        .rule-card:hover {
            border-left-color: var(--accent-glow);
            box-shadow: 0 4px 20px rgba(37,99,235,0.2);
        }
        .rule-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--text-primary);
        }
        .rule-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin: 0;
        }

        .visual-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2.5rem;
            align-items: center;
        }
        .visual-grid img {
            border-radius: var(--radius-lg);
            box-shadow: 0 0 30px rgba(37,99,235,0.2);
        }
        .visual-grid .text-side h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .visual-grid .text-side p {
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 1.5rem;
        }

        .btn-glow {
            display: inline-block;
            padding: 0.7rem 1.8rem;
            background: linear-gradient(135deg, #2563EB, #1D4ED8);
            color: #fff;
            font-weight: 700;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 20px rgba(37, 99, 235, 0.5);
            transition: var(--transition-smooth);
            text-decoration: none;
        }
        .btn-glow:hover {
            box-shadow: 0 0 30px rgba(56, 189, 248, 0.8);
            transform: translateY(-2px);
            color: #fff;
        }

        .faq-item {
            background: rgba(16, 28, 60, 0.4);
            border: 1px solid rgba(37,99,235,0.15);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            margin-bottom: 1rem;
            transition: var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--accent-glow);
        }
        .faq-item h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
        }
        .faq-item p {
            color: var(--text-secondary);
            margin: 0;
            font-size: 0.95rem;
        }

        .cta-banner {
            background: linear-gradient(135deg, rgba(37,99,235,0.2), rgba(56,189,248,0.15));
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-xl);
            padding: 3rem 2rem;
            text-align: left;
            box-shadow: 0 0 40px rgba(37,99,235,0.15);
        }
        .cta-banner h2 {
            font-size: 1.9rem;
            font-weight: 800;
        }

        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 3rem 0 2rem;
            margin-top: 2rem;
            font-size: 0.92rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-col h4 {
            color: var(--text-primary);
            margin-bottom: 1rem;
            font-weight: 700;
        }
        .footer-col a {
            display: block;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
            transition: var(--transition-fast);
        }
        .footer-col a:hover {
            color: var(--accent-glow);
        }
        .footer-payments {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
            margin-top: 1rem;
        }
        .payment-badge {
            background: rgba(37,99,235,0.2);
            border: 1px solid var(--border-color);
            border-radius: 100px;
            padding: 0.3rem 0.9rem;
            font-size: 0.78rem;
            color: var(--text-secondary);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 1.5rem;
            text-align: center;
            color: var(--text-muted);
        }

        .fab-left {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            width: 56px;
            height: 56px;
            background: rgba(7,7,13,0.8);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            border-radius: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-glow);
            font-size: 1.5rem;
            box-shadow: 0 0 20px rgba(6,182,212,0.45);
            transition: var(--transition-smooth);
            cursor: pointer;
        }
        .fab-left:hover {
            transform: scale(1.1);
            box-shadow: 0 0 30px rgba(6,182,212,0.7);
        }

        @media (max-width: 1024px) {
            .visual-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        @media (max-width: 768px) {
            .main-nav {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: rgba(10,14,26,0.95);
                flex-direction: column;
                padding: 1rem;
                border-bottom: 1px solid var(--border-color);
            }
            .main-nav.open {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .page-hero h1 {
                font-size: 1.8rem;
            }
            .rule-grid {
                grid-template-columns: 1fr;
            }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #10162B;
            --bg-card: rgba(16, 28, 60, 0.6);
            --accent: #2563EB;
            --accent-glow: #38BDF8;
            --accent-hover: #1D4ED8;
            --text-primary: #F8FAFC;
            --text-secondary: #D1D5DB;
            --text-muted: #9CA3AF;
            --border-color: rgba(37, 99, 235, 0.3);
            --border-glow: rgba(56, 189, 248, 0.5);
            --shadow-glow: 0 0 15px rgba(37, 99, 235, 0.4);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --font-sans: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-display: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 20% 10%, rgba(37, 99, 235, 0.08) 0%, transparent 70%),
                radial-gradient(ellipse at 80% 90%, rgba(56, 189, 248, 0.05) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }
        a { color: var(--accent-glow); text-decoration: none; transition: color var(--transition-fast); }
        a:hover { color: var(--accent-hover); }
        img { max-width: 100%; height: auto; display: block; }
        button, .button { cursor: pointer; font-family: var(--font-sans); border: none; outline: none; transition: all var(--transition-smooth); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 1.25rem; position: relative; z-index: 1; }

        .site-header {
            position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
            background: rgba(10, 14, 26, 0.85); backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color); box-shadow: 0 2px 20px rgba(0,0,0,0.5);
        }
        .header-inner {
            display: flex; align-items: center; justify-content: space-between;
            height: 70px; max-width: 1280px; margin: 0 auto; padding: 0 1.5rem;
        }
        .logo {
            display: flex; align-items: center; gap: 0.5rem;
            font-family: var(--font-display); font-size: 1.15rem; font-weight: 700;
            color: var(--text-primary); text-decoration: none; white-space: nowrap;
        }
        .logo i { font-size: 1.6rem; color: var(--accent-glow); filter: drop-shadow(0 0 8px rgba(56,189,248,0.6)); }
        .logo span { background: linear-gradient(135deg, #F8FAFC 0%, #38BDF8 80%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .main-nav { display: flex; align-items: center; gap: 0.15rem; }
        .main-nav a {
            display: inline-flex; align-items: center; padding: 0.6rem 1.1rem;
            color: var(--text-secondary); font-weight: 500; font-size: 0.92rem;
            border-radius: var(--radius-sm); transition: all var(--transition-fast); white-space: nowrap;
        }
        .main-nav a:hover, .main-nav a.active { color: var(--text-primary); background: rgba(37,99,235,0.15); }
        .main-nav a.active::after {
            content: ''; position: absolute; bottom: 4px; left: 50%; transform: translateX(-50%);
            width: 20px; height: 2px; background: var(--accent-glow); border-radius: 1px; box-shadow: 0 0 8px rgba(56,189,248,0.6);
        }
        .nav-actions { display: flex; align-items: center; gap: 0.6rem; }
        .btn-login {
            padding: 0.5rem 1.2rem; background: transparent; color: var(--text-primary);
            border: 1.5px solid var(--border-color); border-radius: var(--radius-sm);
            font-weight: 600; font-size: 0.88rem;
        }
        .btn-login:hover { border-color: var(--accent-glow); box-shadow: 0 0 10px rgba(56,189,248,0.3); background: rgba(37,99,235,0.1); }
        .btn-signup {
            padding: 0.5rem 1.4rem; background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
            color: #FFF; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.88rem;
            box-shadow: 0 0 15px rgba(37,99,235,0.5);
        }
        .btn-signup:hover { box-shadow: 0 0 22px rgba(37,99,235,0.8); transform: translateY(-1px); }

        .page-hero {
            padding: 120px 0 60px; position: relative; overflow: hidden;
            background: linear-gradient(180deg, rgba(37,99,235,0.1) 0%, transparent 70%);
        }
        .hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
        .hero-content h1 { font-size: 2.5rem; font-weight: 800; line-height: 1.3; margin-bottom: 1.25rem; }
        .hero-content h1 span { background: linear-gradient(135deg, #38BDF8, #818CF8); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .hero-content p { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 1.5rem; line-height: 1.7; max-width: 520px; }
        .hero-visual {
            background: var(--bg-card); backdrop-filter: blur(15px); border: 1px solid var(--border-color);
            border-radius: var(--radius-lg); padding: 1.5rem; box-shadow: var(--shadow-card);
            display: flex; flex-direction: column; align-items: center;
        }
        .hero-visual img { border-radius: var(--radius-md); margin-bottom: 1rem; width: 100%; }
        .hero-visual .metric-row { display: flex; gap: 2rem; justify-content: center; }
        .hero-visual .metric { text-align: center; }
        .hero-visual .metric strong { display: block; font-size: 1.6rem; color: var(--accent-glow); }

        .section { padding: 4rem 0; }
        .section-dark { background: var(--bg-secondary); }
        .section-title { font-size: 2rem; font-weight: 700; margin-bottom: 0.5rem; color: var(--text-primary); }
        .section-subtitle { color: var(--text-muted); margin-bottom: 2.5rem; font-size: 1.05rem; }

        .tips-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
        .tip-card {
            background: var(--bg-card); backdrop-filter: blur(12px); border: 1px solid var(--border-color);
            border-radius: var(--radius-lg); padding: 1.5rem; transition: all var(--transition-smooth);
            display: flex; flex-direction: column; gap: 0.75rem;
        }
        .tip-card:hover { border-color: var(--border-glow); box-shadow: var(--shadow-glow); transform: translateY(-2px); }
        .tip-icon { font-size: 2rem; color: var(--accent-glow); }
        .tip-card h3 { font-size: 1.2rem; font-weight: 650; margin: 0; }
        .tip-card p { color: var(--text-secondary); font-size: 0.92rem; margin: 0; line-height: 1.6; }

        .strategy-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
        .strategy-box {
            background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg);
            padding: 2rem;
        }
        .strategy-box h3 { font-size: 1.3rem; margin-bottom: 1rem; color: var(--accent-glow); }
        .strategy-box ul { list-style: none; padding: 0; margin: 0; }
        .strategy-box ul li { padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.05); color: var(--text-secondary); font-size: 0.93rem; }
        .strategy-box ul li i { margin-right: 0.5rem; color: var(--accent); }

        .process-steps { display: flex; flex-wrap: wrap; gap: 1.2rem; justify-content: space-between; }
        .process-step {
            flex: 1 1 180px; text-align: left; background: var(--bg-card);
            border-radius: var(--radius-md); padding: 1.8rem 1.2rem; position: relative;
            border: 1px solid var(--border-color);
        }
        .process-step .step-num { font-size: 2rem; font-weight: 800; color: var(--accent); opacity: 0.3; margin-bottom: 0.5rem; }
        .process-step h4 { font-size: 1.1rem; margin-bottom: 0.4rem; }
        .process-step p { color: var(--text-muted); font-size: 0.88rem; }

        .faq-item { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-md); margin-bottom: 0.75rem; padding: 1.25rem 1.5rem; }
        .faq-item h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
        .faq-item p { color: var(--text-secondary); font-size: 0.93rem; }

        .cta-strip {
            background: linear-gradient(135deg, rgba(37,99,235,0.2), rgba(56,189,248,0.1));
            border: 1px solid var(--border-color); border-radius: var(--radius-lg);
            padding: 2.5rem; text-align: left; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1.5rem;
        }
        .cta-strip h2 { font-size: 1.8rem; margin: 0; }
        .btn-cta-primary { padding: 0.8rem 2rem; background: var(--accent); color: white; border-radius: var(--radius-md); font-weight: 700; font-size: 1rem; box-shadow: var(--shadow-glow); }

        .post-list-item {
            display: flex; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid rgba(255,255,255,0.05); align-items: center;
        }
        .post-list-item img { width: 80px; height: 60px; object-fit: cover; border-radius: var(--radius-sm); }
        .post-list-item .info h4 { font-size: 0.95rem; margin-bottom: 0.2rem; }
        .post-list-item .info span { font-size: 0.78rem; color: var(--text-muted); }

        .site-footer { background: #060B18; border-top: 1px solid var(--border-color); padding: 3rem 0 1.5rem; margin-top: 4rem; }
        .footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 2rem; }
        .footer-col h4 { font-size: 1rem; font-weight: 650; margin-bottom: 1rem; color: var(--text-primary); }
        .footer-col a { display: block; color: var(--text-muted); font-size: 0.88rem; margin-bottom: 0.5rem; }
        .footer-col a:hover { color: var(--accent-glow); }
        .footer-payments { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.8rem; }
        .payment-badge { background: rgba(37,99,235,0.2); padding: 0.2rem 0.7rem; border-radius: 2rem; font-size: 0.75rem; color: var(--accent-glow); border: 1px solid var(--border-color); }
        .footer-bottom { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.05); text-align: center; font-size: 0.85rem; color: var(--text-muted); }

        .fab {
            position: fixed; left: 1.5rem; bottom: 6rem; z-index: 50;
            width: 56px; height: 56px; background: rgba(7,7,13,0.8); backdrop-filter: blur(12px);
            border-radius: 50%; border: 2px solid #38BDF8; box-shadow: 0 0 20px rgba(6,182,212,0.45);
            display: flex; align-items: center; justify-content: center; color: #38BDF8; font-size: 1.6rem;
            animation: pulse-border 2s infinite;
        }
        @keyframes pulse-border { 0% { box-shadow: 0 0 10px rgba(6,182,212,0.4); } 50% { box-shadow: 0 0 25px rgba(6,182,212,0.7); } 100% { box-shadow: 0 0 10px rgba(6,182,212,0.4); } }

        @media (max-width: 1024px) {
            .hero-grid { grid-template-columns: 1fr; }
            .strategy-compare { grid-template-columns: 1fr; }
        }
        @media (max-width: 768px) {
            .main-nav { display: none; }
            .process-steps { flex-direction: column; }
            .cta-strip { flex-direction: column; text-align: left; align-items: flex-start; }
        }

/* roulang page: category3 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #10162B;
            --bg-card: rgba(16, 28, 60, 0.6);
            --accent: #2563EB;
            --accent-glow: #38BDF8;
            --accent-hover: #1D4ED8;
            --text-primary: #F8FAFC;
            --text-secondary: #D1D5DB;
            --text-muted: #9CA3AF;
            --border-color: rgba(37, 99, 235, 0.3);
            --border-glow: rgba(56, 189, 248, 0.5);
            --shadow-glow: 0 0 15px rgba(37, 99, 235, 0.4);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --font-sans: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-display: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
            position: relative;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 20% 10%, rgba(37, 99, 235, 0.08) 0%, transparent 70%),
                radial-gradient(ellipse at 80% 90%, rgba(56, 189, 248, 0.05) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }

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

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

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

        button,
        .button {
            cursor: pointer;
            font-family: var(--font-sans);
            border: none;
            outline: none;
            transition: all var(--transition-smooth);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
            position: relative;
            z-index: 1;
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 26, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(37, 99, 235, 0.25);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
            transition: background var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-family: var(--font-display);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            text-decoration: none;
            white-space: nowrap;
        }

        .logo i {
            font-size: 1.6rem;
            color: var(--accent-glow);
            filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.6));
        }

        .logo span {
            background: linear-gradient(135deg, #F8FAFC 0%, #38BDF8 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 0.15rem;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 0.6rem 1.1rem;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.92rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .main-nav a:hover,
        .main-nav a.active {
            color: var(--text-primary);
            background: rgba(37, 99, 235, 0.15);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent-glow);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            background: transparent;
            color: var(--text-primary);
            border: 1.5px solid rgba(37, 99, 235, 0.5);
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            transition: all var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-glow);
            box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
            background: rgba(37, 99, 235, 0.1);
        }

        .btn-signup {
            padding: 0.5rem 1.4rem;
            background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
            color: #FFF;
            border: none;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            box-shadow: 0 0 15px rgba(37, 99, 235, 0.4);
        }

        .btn-signup:hover {
            box-shadow: 0 0 25px rgba(56, 189, 248, 0.6);
            transform: translateY(-1px);
        }

        /* Mobile Menu Toggle */
        .menu-toggle {
            display: none;
            background: transparent;
            border: none;
            color: var(--text-primary);
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }

        @media (max-width: 1024px) {
            .main-nav {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: rgba(10, 14, 26, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 1rem 0;
                gap: 0;
                border-bottom: 1px solid var(--border-color);
            }
            .main-nav.active {
                display: flex;
            }
            .main-nav a {
                padding: 0.8rem 1.5rem;
                width: 100%;
                border-radius: 0;
            }
            .menu-toggle {
                display: block;
            }
            .nav-actions .btn-login,
            .nav-actions .btn-signup {
                padding: 0.4rem 1rem;
                font-size: 0.8rem;
            }
        }

        /* Page Intro Hero */
        .page-hero {
            padding: 140px 0 80px;
            text-align: left;
            position: relative;
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border-color);
        }

        .page-hero .container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }

        .page-hero-text h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, #F8FAFC 0%, #38BDF8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .page-hero-text p {
            font-size: 1.15rem;
            color: var(--text-secondary);
            margin-bottom: 2rem;
            line-height: 1.7;
        }

        .hero-form {
            display: flex;
            gap: 0.8rem;
            flex-wrap: wrap;
        }

        .hero-form input {
            flex: 1;
            min-width: 200px;
            padding: 0.85rem 1.2rem;
            background: rgba(37, 99, 235, 0.1);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            color: var(--text-primary);
            font-size: 1rem;
            outline: none;
            transition: all var(--transition-fast);
        }

        .hero-form input:focus {
            border-color: var(--accent-glow);
            box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
            background: rgba(37, 99, 235, 0.2);
        }

        .hero-form .btn-signup {
            padding: 0.85rem 2rem;
            border-radius: var(--radius-md);
            font-size: 1rem;
        }

        .page-hero-image img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
        }

        /* Section Title */
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-primary);
            text-align: left;
        }

        .section-desc {
            color: var(--text-muted);
            margin-bottom: 2.5rem;
            font-size: 1rem;
            max-width: 700px;
            line-height: 1.7;
        }

        /* Promo Cards */
        .promo-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin: 2.5rem 0;
        }

        .promo-card {
            background: var(--bg-card);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .promo-card:hover {
            transform: translateY(-5px);
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }

        .promo-tag {
            position: absolute;
            top: 1rem;
            right: 1rem;
            background: linear-gradient(135deg, #F59E0B, #EA580C);
            color: #000;
            font-weight: 700;
            font-size: 0.7rem;
            padding: 0.3rem 0.8rem;
            border-radius: 50px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .promo-icon {
            font-size: 2.8rem;
            color: var(--accent-glow);
            margin-bottom: 1.2rem;
        }

        .promo-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            color: var(--text-primary);
        }

        .promo-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
            margin-bottom: 1.5rem;
        }

        .promo-meta {
            font-size: 0.8rem;
            color: var(--text-secondary);
            border-top: 1px solid var(--border-color);
            padding-top: 1rem;
            display: flex;
            justify-content: space-between;
        }

        @media (max-width: 768px) {
            .page-hero .container {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .page-hero-text h1 {
                font-size: 2rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .promo-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-bottom: 2rem;
        }

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

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

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

        .footer-payments {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
            margin-top: 1rem;
        }

        .payment-badge {
            background: rgba(37, 99, 235, 0.15);
            border: 1px solid var(--border-color);
            padding: 0.3rem 0.8rem;
            border-radius: 50px;
            font-size: 0.7rem;
            font-weight: 600;
            color: var(--text-secondary);
        }

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

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

/* roulang page: category4 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #10162B;
            --bg-card: rgba(16, 28, 60, 0.6);
            --accent: #2563EB;
            --accent-glow: #38BDF8;
            --accent-hover: #1D4ED8;
            --text-primary: #F8FAFC;
            --text-secondary: #D1D5DB;
            --text-muted: #9CA3AF;
            --border-color: rgba(37, 99, 235, 0.3);
            --border-glow: rgba(56, 189, 248, 0.5);
            --shadow-glow: 0 0 15px rgba(37, 99, 235, 0.4);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.6);
            --radius-sm: 0.5rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --font-sans: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-display: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 20% 10%, rgba(37, 99, 235, 0.08) 0%, transparent 70%),
                radial-gradient(ellipse at 80% 90%, rgba(56, 189, 248, 0.05) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }

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

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

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

        button,
        .button {
            cursor: pointer;
            font-family: var(--font-sans);
            border: none;
            outline: none;
            transition: all var(--transition-smooth);
            display: inline-block;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
            position: relative;
            z-index: 1;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 26, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(37, 99, 235, 0.25);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
            transition: background var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-family: var(--font-display);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            text-decoration: none;
            white-space: nowrap;
        }

        .logo i {
            font-size: 1.6rem;
            color: var(--accent-glow);
            filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.6));
        }

        .logo span {
            background: linear-gradient(135deg, #F8FAFC 0%, #38BDF8 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 0.15rem;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 0.6rem 1.1rem;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.92rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .main-nav a:hover,
        .main-nav a.active {
            color: var(--text-primary);
            background: rgba(37, 99, 235, 0.15);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent-glow);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }

        .btn-login {
            padding: 0.5rem 1.2rem;
            background: transparent;
            color: var(--text-primary);
            border: 1.5px solid rgba(37, 99, 235, 0.5);
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            transition: all var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-glow);
            box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
            background: rgba(37, 99, 235, 0.1);
        }

        .btn-signup {
            padding: 0.5rem 1.4rem;
            background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
            color: #FFF;
            border: none;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            box-shadow: 0 0 15px rgba(37, 99, 235, 0.4);
        }

        .btn-signup:hover {
            background: linear-gradient(135deg, #1D4ED8 0%, #1E40AF 100%);
            box-shadow: 0 0 25px rgba(56, 189, 248, 0.5);
        }

        .btn-lg {
            padding: 0.9rem 2.5rem;
            font-size: 1.05rem;
            font-weight: 700;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, #2563EB 0%, #38BDF8 100%);
            color: #FFF;
            box-shadow: 0 6px 25px rgba(37, 99, 235, 0.45);
            letter-spacing: 0.01em;
        }

        .btn-lg:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 35px rgba(56, 189, 248, 0.55);
        }

        .btn-glass {
            padding: 0.7rem 1.8rem;
            background: rgba(37, 99, 235, 0.15);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            font-weight: 600;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-glow);
            transition: all var(--transition-smooth);
        }

        .btn-glass:hover {
            background: rgba(37, 99, 235, 0.25);
            border-color: var(--accent-glow);
            box-shadow: 0 0 25px rgba(56, 189, 248, 0.5);
        }

        .btn-outline-glass {
            padding: 0.7rem 1.8rem;
            background: transparent;
            border: 1.5px solid rgba(37, 99, 235, 0.5);
            color: var(--text-primary);
            font-weight: 600;
            border-radius: var(--radius-md);
            transition: all var(--transition-smooth);
        }

        .btn-outline-glass:hover {
            border-color: var(--accent-glow);
            box-shadow: 0 0 18px rgba(56, 189, 248, 0.4);
            background: rgba(37, 99, 235, 0.1);
        }

        /* Hero */
        .hero-cat {
            padding: 140px 0 90px;
            background: var(--bg-secondary);
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-cat::before {
            content: '';
            position: absolute;
            top: -100px;
            right: -150px;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-cat-content {
            display: flex;
            align-items: center;
            gap: 3rem;
            flex-wrap: wrap;
        }

        .hero-cat-text {
            flex: 1 1 400px;
        }

        .hero-cat-img {
            flex: 1 1 300px;
            position: relative;
            display: flex;
            justify-content: center;
        }

        .hero-cat-img img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            max-width: 400px;
        }

        .badge {
            display: inline-block;
            padding: 0.35rem 1rem;
            background: rgba(37, 99, 235, 0.25);
            border: 1px solid var(--border-color);
            color: var(--accent-glow);
            border-radius: 50px;
            font-size: 0.82rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            text-transform: uppercase;
        }

        .hero-cat h1 {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin: 1.2rem 0 1rem;
            line-height: 1.2;
            color: #FFF;
        }

        .hero-cat h1 span {
            background: linear-gradient(135deg, #38BDF8, #2563EB);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-cat .lead {
            font-size: 1.15rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 2rem;
        }

        /* Section Titles */
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-primary);
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-muted);
            margin-bottom: 2.5rem;
        }

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

        .section-header.left {
            text-align: left;
        }

        .section-header.center {
            text-align: center;
        }

        /* Promo Cards */
        .promo-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 1.8rem;
            margin: 2.5rem 0;
        }

        .promo-card {
            background: var(--bg-card);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 2rem 1.8rem;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .promo-card::after {
            content: '';
            position: absolute;
            top: -40px;
            right: -40px;
            width: 100px;
            height: 100px;
            background: radial-gradient(circle, rgba(56, 189, 248, 0.2) 0%, transparent 70%);
            border-radius: 50%;
        }

        .promo-card:hover {
            transform: translateY(-5px);
            border-color: var(--accent-glow);
            box-shadow: 0 12px 35px rgba(37, 99, 235, 0.3);
        }

        .promo-tag {
            font-size: 0.72rem;
            font-weight: 700;
            background: linear-gradient(135deg, #F59E0B, #DC2626);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 0.8rem;
        }

        .promo-card h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0.5rem 0 0.7rem;
            color: #FFF;
        }

        .promo-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 1.5rem;
        }

        .promo-value {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-glow);
            margin: 0.8rem 0;
        }

        /* Steps */
        .steps-panel {
            background: rgba(10, 14, 26, 0.6);
            border-radius: var(--radius-xl);
            padding: 3rem 2rem;
            border: 1px solid var(--border-color);
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }

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

        .step-num {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #2563EB, #38BDF8);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.3rem;
            color: #FFF;
            flex-shrink: 0;
        }

        .step-text h4 {
            font-weight: 700;
            color: #FFF;
            margin-bottom: 0.4rem;
            font-size: 1.1rem;
        }

        .step-text p {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin: 0;
        }

        /* Stats */
        .stats-row {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            justify-content: center;
            margin: 2.5rem 0;
        }

        .stat-block {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 1.8rem 2.2rem;
            text-align: center;
            min-width: 180px;
            backdrop-filter: blur(10px);
        }

        .stat-num {
            font-size: 2.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, #FFF, #38BDF8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .stat-label {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-top: 0.3rem;
        }

        /* FAQ */
        .faq-list {
            margin: 2rem 0;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 1rem;
            backdrop-filter: blur(10px);
            transition: all var(--transition-fast);
        }

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

        .faq-question {
            padding: 1.2rem 1.8rem;
            cursor: pointer;
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #FFF;
        }

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

        .faq-answer {
            padding: 0 1.8rem 1.2rem;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            display: none;
        }

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

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

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.15) 0%, rgba(16, 22, 43, 0.9) 100%);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: 3.5rem 2.5rem;
            text-align: center;
            margin: 3rem 0;
            backdrop-filter: blur(15px);
        }

        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 700;
            color: #FFF;
        }

        .cta-section p {
            color: var(--text-secondary);
            margin: 1rem 0 2rem;
            font-size: 1.1rem;
        }

        /* Footer */
        .site-footer {
            background: rgba(10, 14, 26, 0.9);
            border-top: 1px solid var(--border-color);
            padding: 4rem 0 1.5rem;
            margin-top: 3rem;
            backdrop-filter: blur(15px);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 2rem;
            margin-bottom: 2.5rem;
        }

        .footer-col h4 {
            color: #FFF;
            font-weight: 700;
            margin-bottom: 1rem;
            font-size: 1.1rem;
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            margin: 0.5rem 0;
            font-size: 0.9rem;
            transition: color var(--transition-fast);
        }

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

        .footer-payments {
            display: flex;
            gap: 0.6rem;
            flex-wrap: wrap;
            margin-top: 1rem;
        }

        .payment-badge {
            background: rgba(37, 99, 235, 0.25);
            color: var(--text-primary);
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 600;
            border: 1px solid var(--border-color);
        }

        .footer-bottom {
            border-top: 1px solid rgba(37, 99, 235, 0.2);
            padding-top: 1.5rem;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        /* FAB */
        .fab {
            position: fixed;
            left: 1.2rem;
            bottom: 4rem;
            z-index: 50;
            width: 54px;
            height: 54px;
            background: linear-gradient(135deg, #2563EB, #38BDF8);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 22px rgba(56, 189, 248, 0.6);
            cursor: pointer;
            transition: all var(--transition-smooth);
            font-size: 1.5rem;
            color: #FFF;
        }

        .fab:hover {
            transform: scale(1.1);
            box-shadow: 0 0 35px rgba(56, 189, 248, 0.8);
        }

        @media (max-width: 1024px) {
            .main-nav a {
                padding: 0.5rem 0.7rem;
                font-size: 0.82rem;
            }
            .hero-cat h1 {
                font-size: 2.3rem;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: wrap;
                height: auto;
                padding: 1rem;
                gap: 0.8rem;
            }
            .main-nav {
                order: 3;
                width: 100%;
                overflow-x: auto;
                flex-wrap: nowrap;
                gap: 0.5rem;
            }
            .hero-cat {
                padding: 120px 0 60px;
            }
            .hero-cat h1 {
                font-size: 2rem;
            }
            .promo-grid {
                grid-template-columns: 1fr;
            }
            .steps-panel {
                grid-template-columns: 1fr;
            }
        }