/* roulang page: index */
:root {
            --bg-primary: #080c14;
            --bg-secondary: #0f1522;
            --bg-card: #131b2a;
            --bg-elevated: #182134;
            --neon-primary: #00d8a8;
            --neon-primary-dim: rgba(0, 216, 168, 0.15);
            --neon-secondary: #ff3d7f;
            --neon-glow: 0 0 18px rgba(0, 216, 168, 0.35);
            --text-primary: #e8ecf4;
            --text-secondary: #a0a8ba;
            --text-weak: #6c7587;
            --border-color: rgba(255, 255, 255, 0.08);
            --border-glow: rgba(0, 216, 168, 0.4);
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-sm: 8px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.25);
            --shadow-hover: 0 16px 40px rgba(0, 216, 168, 0.12);
            --transition-base: all 0.3s ease;
            --spacer-section: 100px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
            line-height: 1.7;
            background: var(--bg-primary);
            color: var(--text-primary);
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: var(--neon-primary);
            transition: var(--transition-base);
        }
        a:hover {
            color: #00f0bc;
        }
        img {
            max-width: 100%;
            height: auto;
        }
        .container {
            max-width: 1200px;
            padding-left: 18px;
            padding-right: 18px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1040;
            background: rgba(8, 12, 20, 0.92);
            backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition-base);
        }
        .site-header::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -1px;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(0, 216, 168, 0.5), rgba(255, 61, 127, 0.3), transparent);
        }
        .site-header .navbar {
            padding-top: 14px;
            padding-bottom: 14px;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.45rem;
            letter-spacing: 1px;
            color: var(--text-primary) !important;
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 0;
        }
        .navbar-brand .brand-icon {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--neon-primary), var(--neon-secondary));
            border-radius: 10px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #0a0e17;
            box-shadow: 0 0 14px rgba(0, 216, 168, 0.35);
        }
        .navbar-toggler {
            border: 1px solid var(--border-color) !important;
            border-radius: var(--radius-sm);
            padding: 6px 10px;
            background: transparent;
        }
        .navbar-toggler:focus {
            box-shadow: none;
        }
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%23e8ecf4' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
            display: inline-block;
            width: 1.3em;
            height: 1.3em;
        }
        .navbar-nav {
            gap: 4px;
        }
        .nav-link {
            color: var(--text-secondary) !important;
            font-weight: 500;
            padding: 8px 18px !important;
            border-radius: 30px;
            position: relative;
            font-size: 0.97rem;
            letter-spacing: 0.3px;
            transition: all 0.3s;
        }
        .nav-link:hover {
            color: var(--text-primary) !important;
            background: rgba(255, 255, 255, 0.04);
        }
        .nav-link.active {
            color: var(--neon-primary) !important;
            text-shadow: 0 0 12px rgba(0, 216, 168, 0.5);
        }
        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            bottom: 2px;
            width: 20px;
            height: 2px;
            background: var(--neon-primary);
            border-radius: 4px;
            box-shadow: var(--neon-glow);
        }
        .btn-nav-cta {
            background: linear-gradient(135deg, var(--neon-primary), #00b894);
            color: #08120e !important;
            font-weight: 700;
            border: none;
            padding: 8px 22px;
            border-radius: 30px;
            font-size: 0.92rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all 0.3s;
            margin-left: 14px;
            box-shadow: 0 4px 16px rgba(0, 216, 168, 0.3);
        }
        .btn-nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 216, 168, 0.45);
            color: #08120e !important;
        }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            padding: 180px 0 120px;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            min-height: 760px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .hero-section::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(115deg, rgba(6, 10, 18, 0.97) 0%, rgba(8, 13, 24, 0.88) 45%, rgba(8, 13, 24, 0.5) 100%);
            z-index: 1;
        }
        .hero-section::after {
            content: "";
            position: absolute;
            bottom: -1px;
            left: 0;
            right: 0;
            height: 120px;
            background: linear-gradient(0deg, var(--bg-primary) 0%, transparent 100%);
            z-index: 2;
        }
        .hero-container {
            position: relative;
            z-index: 3;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 216, 168, 0.12);
            border: 1px solid rgba(0, 216, 168, 0.3);
            color: var(--neon-primary);
            font-size: 0.88rem;
            font-weight: 600;
            padding: 6px 18px;
            border-radius: 40px;
            letter-spacing: 1px;
            margin-bottom: 22px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i {
            font-size: 0.8rem;
        }
        .hero-title {
            font-size: 3.6rem;
            font-weight: 900;
            line-height: 1.2;
            letter-spacing: 2px;
            margin-bottom: 20px;
            color: var(--text-primary);
        }
        .hero-title .gradient-text {
            background: linear-gradient(135deg, var(--neon-primary) 0%, #00f0bc 50%, var(--neon-secondary) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 580px;
            margin-bottom: 36px;
            line-height: 1.85;
        }
        .hero-buttons {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn-primary-glow {
            background: linear-gradient(135deg, var(--neon-primary), #00b894);
            color: #08120e;
            font-weight: 700;
            padding: 12px 30px;
            border-radius: 36px;
            border: none;
            font-size: 1rem;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 6px 24px rgba(0, 216, 168, 0.35);
            transition: all 0.35s;
        }
        .btn-primary-glow:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(0, 216, 168, 0.5);
            color: #08120e;
        }
        .btn-outline-neon {
            background: transparent;
            border: 1px solid rgba(0, 216, 168, 0.5);
            color: var(--neon-primary);
            font-weight: 600;
            padding: 11px 30px;
            border-radius: 36px;
            font-size: 1rem;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.35s;
        }
        .btn-outline-neon:hover {
            background: rgba(0, 216, 168, 0.08);
            border-color: var(--neon-primary);
            color: #00f0bc;
            box-shadow: 0 0 24px rgba(0, 216, 168, 0.2);
        }
        .hero-stats-mini {
            display: flex;
            gap: 30px;
            margin-top: 50px;
            flex-wrap: wrap;
        }
        .hero-stats-mini .stat-mini {
            display: flex;
            flex-direction: column;
        }
        .hero-stats-mini .stat-mini strong {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-primary);
        }
        .hero-stats-mini .stat-mini span {
            font-size: 0.82rem;
            color: var(--text-weak);
            letter-spacing: 0.5px;
        }

        /* ===== Section ===== */
        .section {
            padding: var(--spacer-section) 0;
        }
        .section-alt {
            background: var(--bg-secondary);
        }
        .section-title-wrap {
            margin-bottom: 50px;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: 1px;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 560px;
            line-height: 1.8;
        }
        .section-title-line {
            width: 50px;
            height: 3px;
            background: linear-gradient(90deg, var(--neon-primary), transparent);
            border-radius: 4px;
            margin-bottom: 20px;
        }

        /* ===== Feature Cards ===== */
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 34px 28px;
            height: 100%;
            transition: all 0.4s;
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--neon-primary), var(--neon-secondary));
            opacity: 0;
            transition: opacity 0.4s;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--border-glow);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-icon {
            width: 58px;
            height: 58px;
            background: var(--neon-primary-dim);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--neon-primary);
            margin-bottom: 22px;
            transition: all 0.3s;
        }
        .feature-card:hover .feature-icon {
            background: rgba(0, 216, 168, 0.2);
            box-shadow: 0 0 20px rgba(0, 216, 168, 0.2);
        }
        .feature-card h3 {
            font-size: 1.28rem;
            font-weight: 700;
            margin-bottom: 14px;
        }
        .feature-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-bottom: 0;
            line-height: 1.85;
        }

        /* ===== Category Cards ===== */
        .category-card {
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            height: 100%;
            display: flex;
            flex-direction: column;
            transition: all 0.4s;
            position: relative;
        }
        .category-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-hover);
            border-color: var(--border-glow);
        }
        .category-card-img {
            height: 200px;
            background-size: cover;
            background-position: center;
            position: relative;
            overflow: hidden;
        }
        .category-card-img::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 0%, rgba(8, 12, 20, 0.8) 100%);
        }
        .category-card-img .category-tag {
            position: absolute;
            top: 16px;
            left: 16px;
            z-index: 2;
            background: rgba(0, 216, 168, 0.9);
            color: #08120e;
            font-size: 0.78rem;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: 30px;
            letter-spacing: 0.5px;
        }
        .category-card-body {
            padding: 26px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .category-card-body h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .category-card-body p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.8;
            flex: 1;
            margin-bottom: 18px;
        }
        .category-link {
            font-weight: 600;
            font-size: 0.92rem;
            color: var(--neon-primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .category-link:hover {
            gap: 12px;
            color: #00f0bc;
        }

        /* ===== Article List ===== */
        .article-item {
            display: flex;
            gap: 24px;
            padding: 28px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            margin-bottom: 16px;
            transition: all 0.3s;
        }
        .article-item:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-card);
            transform: translateX(4px);
        }
        .article-item-icon {
            width: 46px;
            height: 46px;
            background: var(--neon-primary-dim);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--neon-primary);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .article-item-content {
            flex: 1;
            min-width: 0;
        }
        .article-item-content h3 {
            font-size: 1.12rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.5;
        }
        .article-item-content h3 a {
            color: var(--text-primary);
        }
        .article-item-content h3 a:hover {
            color: var(--neon-primary);
        }
        .article-item-content p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: 12px;
            line-height: 1.75;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-item-meta {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 0.8rem;
            color: var(--text-weak);
        }
        .article-item-meta span {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        .article-empty {
            text-align: center;
            padding: 46px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--border-color);
            color: var(--text-secondary);
        }

        /* ===== Stats ===== */
        .stats-section {
            background: linear-gradient(135deg, #0d1420 0%, #0a0e17 50%, #0d1420 100%);
            position: relative;
            padding: 80px 0;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .stats-section::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(0, 216, 168, 0.4), transparent);
        }
        .stat-item {
            text-align: center;
            padding: 20px 10px;
        }
        .stat-number {
            font-size: 2.8rem;
            font-weight: 900;
            background: linear-gradient(135deg, var(--neon-primary), #00b894);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-label {
            color: var(--text-secondary);
            font-size: 0.9rem;
            letter-spacing: 1px;
        }

        /* ===== Steps ===== */
        .step-card {
            position: relative;
            text-align: center;
            padding: 30px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            height: 100%;
            transition: all 0.4s;
        }
        .step-card:hover {
            transform: translateY(-5px);
            border-color: var(--border-glow);
            box-shadow: var(--shadow-card);
        }
        .step-number {
            width: 44px;
            height: 44px;
            background: linear-gradient(135deg, var(--neon-primary), var(--neon-secondary));
            color: #08120e;
            font-weight: 800;
            font-size: 1.1rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            box-shadow: 0 0 20px rgba(0, 216, 168, 0.3);
        }
        .step-card h3 {
            font-size: 1.08rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .step-card p {
            color: var(--text-secondary);
            font-size: 0.88rem;
            margin-bottom: 0;
            line-height: 1.75;
        }
        .step-arrow {
            position: absolute;
            right: -22px;
            top: 50%;
            transform: translateY(-50%);
            color: rgba(0, 216, 168, 0.4);
            font-size: 1.3rem;
            z-index: 2;
        }
        @media (max-width: 991px) {
            .step-arrow {
                display: none;
            }
        }

        /* ===== FAQ ===== */
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            margin-bottom: 14px;
            transition: all 0.3s;
        }
        .faq-item:hover {
            border-color: var(--border-glow);
            background: var(--bg-elevated);
        }
        .faq-item h4 {
            font-size: 1.04rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .faq-item h4 i {
            color: var(--neon-primary);
            font-size: 0.9rem;
        }
        .faq-item p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.85;
            margin: 0;
            padding-left: 24px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 0 0 100px;
        }
        .cta-block {
            background: linear-gradient(135deg, rgba(0, 216, 168, 0.12), rgba(255, 61, 127, 0.08));
            border: 1px solid rgba(0, 216, 168, 0.25);
            border-radius: 24px;
            padding: 70px 60px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: "";
            position: absolute;
            top: -50%;
            left: -20%;
            width: 60%;
            height: 200%;
            background: linear-gradient(90deg, transparent, rgba(0, 216, 168, 0.05), transparent);
            transform: rotate(20deg);
        }
        .cta-block h2 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 18px;
        }
        .cta-block p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 480px;
            margin: 0 auto 36px;
            line-height: 1.85;
        }
        .cta-buttons {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #070a10;
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
            position: relative;
        }
        .site-footer::before {
            content: "";
            position: absolute;
            top: -1px;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(0, 216, 168, 0.4), transparent);
        }
        .footer-brand {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }
        .footer-brand .brand-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--neon-primary), var(--neon-secondary));
            border-radius: 9px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
            color: #0a0e17;
        }
        .footer-desc {
            color: var(--text-weak);
            font-size: 0.88rem;
            line-height: 1.8;
            max-width: 300px;
        }
        .footer-title {
            color: var(--text-primary);
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 30px;
            height: 2px;
            background: var(--neon-primary);
            border-radius: 2px;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: var(--text-secondary);
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.3s;
        }
        .footer-links a:hover {
            color: var(--neon-primary);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-color);
            margin-top: 46px;
            padding-top: 24px;
            text-align: center;
            color: var(--text-weak);
            font-size: 0.82rem;
        }
        .footer-bottom a {
            color: var(--text-secondary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 991px) {
            :root {
                --spacer-section: 70px;
            }
            .hero-section {
                padding: 150px 0 80px;
                min-height: auto;
            }
            .hero-title {
                font-size: 2.8rem;
            }
            .navbar-collapse {
                background: var(--bg-secondary);
                border-radius: var(--radius-md);
                padding: 16px;
                margin-top: 14px;
                border: 1px solid var(--border-color);
            }
            .nav-link.active::after {
                display: none;
            }
            .btn-nav-cta {
                margin-left: 0;
                margin-top: 10px;
                width: 100%;
                justify-content: center;
            }
            .stat-number {
                font-size: 2.2rem;
            }
            .cta-block {
                padding: 50px 30px;
            }
        }
        @media (max-width: 767px) {
            .hero-title {
                font-size: 2.2rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .article-item {
                flex-direction: column;
                gap: 14px;
                padding: 20px;
            }
            .article-item-icon {
                width: 40px;
                height: 40px;
                font-size: 0.95rem;
            }
            .stat-number {
                font-size: 1.8rem;
            }
            .footer-bottom {
                font-size: 0.75rem;
            }
            .cta-block h2 {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 520px) {
            .hero-section {
                padding: 130px 0 60px;
            }
            .hero-title {
                font-size: 1.8rem;
                letter-spacing: 1px;
            }
            .hero-badge {
                font-size: 0.78rem;
                padding: 5px 12px;
            }
            .hero-buttons {
                flex-direction: column;
                gap: 10px;
            }
            .hero-buttons .btn {
                width: 100%;
                justify-content: center;
            }
            .hero-stats-mini {
                gap: 16px;
            }
            .hero-stats-mini .stat-mini strong {
                font-size: 1.2rem;
            }
            .cta-buttons {
                flex-direction: column;
            }
            .cta-buttons .btn {
                width: 100%;
                justify-content: center;
            }
            .section-title-wrap {
                margin-bottom: 30px;
            }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #00e5ff;
            --primary-glow: rgba(0, 229, 255, 0.18);
            --secondary: #7b61ff;
            --accent: #ff3d81;
            --bg-dark: #060a13;
            --bg-deep: #0b1120;
            --bg-body: #0d1428;
            --bg-card: #111c30;
            --bg-soft: #16233c;
            --text-main: #eef2f9;
            --text-muted: #9aa7bd;
            --text-dim: #627089;
            --border: rgba(255, 255, 255, 0.07);
            --border-hover: rgba(0, 229, 255, 0.35);
            --radius-lg: 20px;
            --radius-md: 14px;
            --radius-sm: 10px;
            --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.35);
            --shadow-glow: 0 0 45px rgba(0, 229, 255, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        }

        /* ===== Reset / Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            scroll-padding-top: 90px;
        }
        body {
            font-family: var(--font-family);
            background: var(--bg-body);
            color: var(--text-main);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        button,
        input,
        textarea {
            font-family: inherit;
        }
        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        /* ===== Container / Section ===== */
        .container {
            max-width: 1200px;
        }
        .section {
            padding: 85px 0;
            position: relative;
        }
        .section-alt {
            background: var(--bg-deep);
        }
        .section-head {
            max-width: 720px;
            margin: 0 auto 52px;
        }
        .section-head.text-start {
            margin-left: 0;
        }
        .section-tag {
            display: inline-block;
            padding: 6px 18px;
            font-size: 0.78rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            color: var(--primary);
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.22);
            border-radius: 30px;
            margin-bottom: 14px;
            text-transform: uppercase;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.3;
            margin-bottom: 16px;
            color: #fff;
        }
        .section-desc {
            color: var(--text-muted);
            font-size: 1.05rem;
            margin-bottom: 0;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(6, 10, 19, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
        }
        .navbar {
            padding: 14px 0;
        }
        .navbar-brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            color: #fff;
            line-height: 1;
        }
        .navbar-brand:hover {
            color: #fff;
        }
        .brand-icon {
            width: 38px;
            height: 38px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 11px;
            color: #060a13;
            font-size: 1rem;
            box-shadow: 0 0 22px rgba(0, 229, 255, 0.35);
            flex-shrink: 0;
        }
        .navbar-nav .nav-link {
            color: var(--text-muted);
            font-weight: 500;
            padding: 8px 16px !important;
            border-radius: var(--radius-sm);
            margin: 0 4px;
            position: relative;
            font-size: 0.95rem;
            background: transparent;
        }
        .navbar-nav .nav-link:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.05);
        }
        .navbar-nav .nav-link.active {
            color: var(--primary);
            text-shadow: 0 0 12px rgba(0, 229, 255, 0.45);
        }
        .navbar-nav .nav-link.active::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 16px;
            right: 16px;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 4px;
            box-shadow: 0 0 10px rgba(0, 229, 255, 0.6);
        }
        .btn-nav-cta {
            margin-left: 16px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #060a13;
            font-weight: 700;
            border: none;
            border-radius: 12px;
            padding: 10px 22px;
            font-size: 0.92rem;
            box-shadow: 0 4px 18px rgba(0, 229, 255, 0.25);
            transition: var(--transition);
        }
        .btn-nav-cta:hover {
            color: #060a13;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0, 229, 255, 0.4);
        }
        .btn-nav-cta:focus-visible {
            outline: 3px solid rgba(0, 229, 255, 0.4);
            outline-offset: 2px;
        }
        .navbar-toggler {
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 6px 10px;
            color: #fff;
            background: rgba(255, 255, 255, 0.05);
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 0.2rem rgba(0, 229, 255, 0.15);
        }
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* ===== Hero ===== */
        .page-hero {
            position: relative;
            padding: 110px 0 100px;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
        }
        .page-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(6, 10, 19, 0.82) 0%, rgba(6, 10, 19, 0.58) 40%, rgba(13, 20, 40, 0.9) 100%);
        }
        .page-hero::after {
            content: "";
            position: absolute;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.14), transparent 70%);
            top: 30%;
            right: 8%;
            filter: blur(40px);
            pointer-events: none;
            border-radius: 50%;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-breadcrumb {
            margin-bottom: 26px;
        }
        .hero-breadcrumb .breadcrumb {
            margin-bottom: 0;
        }
        .hero-breadcrumb .breadcrumb-item {
            color: var(--text-muted);
            font-size: 0.88rem;
        }
        .hero-breadcrumb .breadcrumb-item a {
            color: var(--text-muted);
        }
        .hero-breadcrumb .breadcrumb-item a:hover {
            color: var(--primary);
        }
        .hero-breadcrumb .breadcrumb-item.active {
            color: var(--primary);
        }
        .hero-breadcrumb .breadcrumb-item + .breadcrumb-item::before {
            color: var(--text-dim);
            content: "/";
        }
        .page-hero h1 {
            font-size: 2.75rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.25;
            color: #fff;
            margin-bottom: 18px;
            max-width: 680px;
            position: relative;
            padding-bottom: 18px;
        }
        .page-hero h1::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 72px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 4px;
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.5);
        }
        .hero-subtitle {
            font-size: 1.12rem;
            color: var(--text-muted);
            max-width: 580px;
            line-height: 1.8;
            margin-bottom: 34px;
        }
        .hero-buttons {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .hero-buttons .btn {
            border-radius: 12px;
            padding: 12px 28px;
            font-weight: 600;
            font-size: 0.95rem;
        }
        .hero-buttons .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border: none;
            color: #060a13;
            font-weight: 700;
            box-shadow: 0 6px 24px rgba(0, 229, 255, 0.25);
            transition: var(--transition);
        }
        .hero-buttons .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(0, 229, 255, 0.4);
            color: #060a13;
        }
        .hero-buttons .btn-outline-light {
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(4px);
        }
        .hero-buttons .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(255, 255, 255, 0.4);
            color: var(--primary);
        }

        /* ===== Methods Card ===== */
        .methods-section {
            background: var(--bg-body);
        }
        .method-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 36px 30px;
            height: 100%;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .method-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.45s ease;
        }
        .method-card:hover {
            transform: translateY(-8px);
            border-color: var(--border-hover);
            box-shadow: var(--shadow-card);
        }
        .method-card:hover::before {
            transform: scaleX(1);
        }
        .method-card:focus-within {
            border-color: var(--border-hover);
            box-shadow: var(--shadow-card);
        }
        .method-icon {
            width: 58px;
            height: 58px;
            border-radius: 16px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.35rem;
            color: var(--primary);
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(123, 97, 255, 0.1));
            border: 1px solid rgba(0, 229, 255, 0.2);
            margin-bottom: 22px;
        }
        .method-card h3 {
            font-size: 1.18rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .method-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 0;
            line-height: 1.75;
        }

        /* ===== Steps ===== */
        .steps-section {
            background: var(--bg-deep);
        }
        .steps-image {
            position: relative;
            border-radius: 24px;
            overflow: hidden;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
            border: 1px solid var(--border);
        }
        .steps-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 380px;
        }
        .steps-image::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 50%, rgba(6, 10, 19, 0.35) 100%);
            pointer-events: none;
        }
        .step-list {
            margin-top: 8px;
        }
        .step-item {
            display: flex;
            gap: 18px;
            padding: 22px 0;
            position: relative;
            border-bottom: 1px solid var(--border);
        }
        .step-item:last-child {
            border-bottom: none;
        }
        .step-item::before {
            content: "";
            position: absolute;
            left: 25px;
            top: 64px;
            bottom: -8px;
            width: 2px;
            background: linear-gradient(180deg, var(--primary), transparent);
        }
        .step-item:last-child::before {
            display: none;
        }
        .step-number {
            width: 52px;
            height: 52px;
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 800;
            color: var(--primary);
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid var(--border-hover);
            border-radius: 50%;
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.12);
            position: relative;
            z-index: 1;
        }
        .step-content h4 {
            font-size: 1.08rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 6px;
        }
        .step-content p {
            color: var(--text-muted);
            font-size: 0.93rem;
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* ===== Security ===== */
        .security-section {
            background: var(--bg-body);
        }
        .security-image {
            border-radius: 24px;
            overflow: hidden;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
            border: 1px solid var(--border);
        }
        .security-image img {
            width: 100%;
            object-fit: cover;
            min-height: 340px;
        }
        .security-list {
            margin-top: 8px;
        }
        .security-list li {
            display: flex;
            gap: 16px;
            padding: 18px 0;
            border-bottom: 1px solid var(--border);
            align-items: flex-start;
        }
        .security-list li:last-child {
            border-bottom: none;
        }
        .security-list .sec-icon {
            width: 42px;
            height: 42px;
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: var(--primary);
            background: rgba(0, 229, 255, 0.07);
            border: 1px solid rgba(0, 229, 255, 0.18);
            border-radius: 12px;
            margin-top: 2px;
        }
        .security-list strong {
            display: block;
            color: #fff;
            font-size: 1rem;
            margin-bottom: 4px;
        }
        .security-list p {
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* ===== Stats ===== */
        .stats-section {
            background: var(--bg-depth);
            padding: 70px 0;
        }
        .stat-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 34px 24px;
            text-align: center;
            height: 100%;
            transition: var(--transition);
        }
        .stat-card:hover {
            border-color: var(--border-hover);
            transform: translateY(-5px);
            box-shadow: var(--shadow-card);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .stat-label {
            color: var(--text-muted);
            font-size: 0.92rem;
            margin-top: 10px;
            line-height: 1.5;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-deep);
        }
        .faq-container {
            max-width: 820px;
            margin: 0 auto;
        }
        .accordion-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md) !important;
            margin-bottom: 14px;
            overflow: hidden;
            transition: var(--transition);
        }
        .accordion-item:hover {
            border-color: rgba(0, 229, 255, 0.15);
        }
        .accordion-button {
            background: transparent;
            color: var(--text-main);
            font-weight: 600;
            padding: 19px 24px;
            font-size: 1rem;
            line-height: 1.5;
            border: none;
            box-shadow: none;
            transition: var(--transition);
        }
        .accordion-button:not(.collapsed) {
            background: rgba(0, 229, 255, 0.05);
            color: var(--primary);
            box-shadow: none;
        }
        .accordion-button:focus {
            box-shadow: 0 0 0 0.2rem rgba(0, 229, 255, 0.12);
        }
        .accordion-button::after {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%2300e5ff'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
            transition: transform 0.35s ease, filter 0.3s ease;
        }
        .accordion-button:not(.collapsed)::after {
            filter: drop-shadow(0 0 4px rgba(0, 229, 255, 0.5));
        }
        .accordion-body {
            padding: 0 24px 22px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.75;
            border-top: 1px solid var(--border);
            background: rgba(0, 0, 0, 0.15);
        }

        /* ===== CTA ===== */
        .cta-section {
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .cta-section::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(6, 10, 19, 0.92), rgba(13, 20, 40, 0.85));
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-box {
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.1), rgba(123, 97, 255, 0.08));
            border: 1px solid rgba(0, 229, 255, 0.2);
            border-radius: 28px;
            padding: 60px 50px;
            text-align: center;
            position: relative;
            overflow: hidden;
            backdrop-filter: blur(8px);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
        }
        .cta-box::before {
            content: "";
            position: absolute;
            width: 230px;
            height: 230px;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.18), transparent 70%);
            top: -90px;
            right: -80px;
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-box::after {
            content: "";
            position: absolute;
            width: 160px;
            height: 160px;
            background: radial-gradient(circle, rgba(123, 97, 255, 0.15), transparent 70%);
            bottom: -60px;
            left: -50px;
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-title {
            font-size: 1.9rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }
        .cta-desc {
            color: var(--text-muted);
            font-size: 1.05rem;
            max-width: 520px;
            margin: 0 auto 32px;
        }
        .cta-buttons {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-cta-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #060a13;
            font-weight: 700;
            border: none;
            border-radius: 14px;
            padding: 14px 34px;
            font-size: 1rem;
            box-shadow: 0 6px 24px rgba(0, 229, 255, 0.3);
            transition: var(--transition);
        }
        .btn-cta-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 36px rgba(0, 229, 255, 0.4);
            color: #060a13;
        }
        .btn-cta-secondary {
            background: rgba(255, 255, 255, 0.06);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 14px;
            padding: 14px 34px;
            font-size: 1rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-cta-secondary:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--border-hover);
            color: var(--primary);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            border-top: 1px solid var(--border);
            padding: 80px 0 0;
            margin-top: 0;
            position: relative;
        }
        .site-footer::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--primary), transparent);
            opacity: 0.3;
        }
        .footer-brand {
            font-size: 1.4rem;
            font-weight: 800;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-desc {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.8;
            max-width: 340px;
            margin-bottom: 0;
        }
        .footer-title {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 12px;
        }
        .footer-title::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 32px;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 2px;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: var(--text-muted);
            font-size: 0.92rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a i {
            font-size: 0.75rem;
            color: var(--primary);
            opacity: 0.7;
        }
        .footer-links a:hover {
            color: var(--primary);
            padding-left: 6px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding: 24px 0;
            margin-top: 60px;
            text-align: center;
            color: var(--text-dim);
            font-size: 0.85rem;
            background: rgba(0, 0, 0, 0.25);
        }
        .footer-bottom p {
            margin: 0;
            line-height: 1.7;
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }

        /* ===== Buttons ===== */
        .btn:focus-visible,
        .form-control:focus {
            outline: 3px solid rgba(0, 229, 255, 0.3);
            outline-offset: 2px;
            box-shadow: none;
        }

        /* ===== Responsive ===== */
        @media (max-width: 991.98px) {
            .section {
                padding: 65px 0;
            }
            .page-hero {
                padding: 80px 0 75px;
            }
            .navbar-collapse {
                padding: 16px 0 6px;
            }
            .navbar-nav .nav-link {
                padding: 12px 16px !important;
                margin: 0;
            }
            .navbar-nav .nav-link.active::after {
                left: 16px;
                right: auto;
                width: 40px;
            }
            .btn-nav-cta {
                margin-left: 0;
                margin-top: 14px;
                display: inline-flex;
                align-items: center;
                gap: 8px;
            }
            .nav-cta-wrap {
                padding-top: 8px;
            }
            .steps-section .section-head {
                margin-top: 34px;
            }
        }

        @media (max-width: 767.98px) {
            .section {
                padding: 55px 0;
            }
            .page-hero {
                padding: 60px 0 55px;
                text-align: center;
            }
            .page-hero h1 {
                font-size: 2.1rem;
                margin-left: auto;
                margin-right: auto;
            }
            .page-hero h1::after {
                left: 50%;
                transform: translateX(-50%);
            }
            .hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .hero-breadcrumb .breadcrumb {
                justify-content: center;
            }
            .hero-breadcrumb .breadcrumb-item + .breadcrumb-item::before {
                padding-left: 0.3rem;
                padding-right: 0.3rem;
            }
            .hero-buttons {
                justify-content: center;
            }
            .section-title {
                font-size: 1.75rem;
            }
            .section-head {
                margin-bottom: 40px;
            }
            .stat-number {
                font-size: 2rem;
            }
            .cta-box {
                padding: 44px 28px;
            }
            .cta-title {
                font-size: 1.55rem;
            }
            .site-footer {
                padding-top: 55px;
            }
            .footer-bottom {
                margin-top: 40px;
            }
        }

        @media (max-width: 575.98px) {
            .page-hero h1 {
                font-size: 1.7rem;
            }
            .hero-buttons .btn {
                width: 100%;
                margin-bottom: 6px;
            }
            .hero-buttons .btn:last-child {
                margin-bottom: 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .section-tag {
                font-size: 0.7rem;
                padding: 5px 14px;
            }
            .step-item {
                flex-direction: row;
            }
            .step-item::before {
                display: none;
            }
            .method-card {
                padding: 28px 22px;
            }
            .cta-buttons .btn {
                width: 100%;
            }
            .footer-bottom {
                font-size: 0.78rem;
                padding: 18px 12px;
            }
            .brand-icon {
                width: 34px;
                height: 34px;
                font-size: 0.9rem;
            }
        }

/* roulang page: article */
:root {
            --primary: #0d1b2a;
            --primary-light: #1b2a4a;
            --primary-lighter: #243b56;
            --accent: #00e5ff;
            --accent-blue: #00a8ff;
            --accent-rgb: 0, 229, 255;
            --gold: #f5a623;
            --bg-light: #f4f6f8;
            --bg-white: #ffffff;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --border: #e2e8f0;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.07);
            --shadow-lg: 0 16px 44px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
            --font-main: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-main);
            color: var(--text-main);
            line-height: 1.7;
            background: var(--bg-light);
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }

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

        a:hover {
            color: #0077cc;
        }

        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-sm);
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* ---------- Header / Nav ---------- */
        .site-header {
            background: var(--primary);
            border-bottom: 2px solid var(--accent);
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: 0 4px 24px rgba(0, 229, 255, 0.12);
        }

        .navbar {
            padding: 14px 0;
        }

        .navbar-brand {
            color: #ffffff;
            font-weight: 800;
            font-size: 1.4rem;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }

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

        .navbar-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--accent), var(--accent-blue));
            color: var(--primary);
            border-radius: 9px;
            font-size: 1rem;
            box-shadow: 0 0 14px rgba(0, 229, 255, 0.45);
        }

        .navbar-nav {
            gap: 6px;
        }

        .nav-link {
            color: rgba(255, 255, 255, 0.78) !important;
            font-weight: 500;
            padding: 10px 18px !important;
            border-radius: 10px;
            position: relative;
            transition: color 0.3s ease, background 0.3s ease, text-shadow 0.3s ease;
        }

        .nav-link:hover {
            color: var(--accent) !important;
            background: rgba(0, 229, 255, 0.08);
            text-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
        }

        .nav-link.active {
            color: var(--accent) !important;
            background: rgba(0, 229, 255, 0.1);
            box-shadow: inset 0 -2px 0 var(--accent);
        }

        .btn-nav-cta {
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-blue) 100%);
            color: var(--primary) !important;
            border: none;
            padding: 10px 26px;
            border-radius: 10px;
            font-weight: 700;
            margin-left: 14px;
            box-shadow: 0 4px 20px rgba(0, 229, 255, 0.25);
            transition: transform 0.3s ease, box-shadow 0.3s ease, filter 0.3s ease;
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(0, 229, 255, 0.4);
            filter: brightness(1.06);
            color: var(--primary);
        }

        .navbar-toggler {
            border: 1px solid rgba(255, 255, 255, 0.3);
            background: rgba(255, 255, 255, 0.06);
            border-radius: 8px;
            padding: 6px 10px;
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.3);
        }

        .navbar-toggler-icon {
            filter: invert(1) grayscale(100%) brightness(200%);
            width: 1.2em;
            height: 1.2em;
        }

        /* ---------- Article Banner ---------- */
        .article-banner {
            position: relative;
            padding: 90px 0 76px;
            background-size: cover;
            background-position: center;
            background-color: var(--primary);
            isolation: isolate;
        }

        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            z-index: -1;
            background: linear-gradient(120deg, rgba(13, 27, 42, 0.94) 0%, rgba(13, 27, 42, 0.78) 50%, rgba(0, 229, 255, 0.22) 100%);
        }

        .article-banner::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--accent), transparent 40%, var(--accent-blue) 100%);
            opacity: 0.7;
            z-index: 1;
        }

        .banner-inner {
            max-width: 850px;
            position: relative;
            z-index: 2;
        }

        .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 229, 255, 0.15);
            border: 1px solid rgba(0, 229, 255, 0.4);
            color: var(--accent);
            padding: 7px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 18px;
            backdrop-filter: blur(4px);
        }

        .banner-inner h1 {
            color: #ffffff;
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 20px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }

        .banner-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.92rem;
        }

        .banner-meta span {
            display: inline-flex;
            align-items: center;
            gap: 7px;
        }

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

        /* ---------- Breadcrumb ---------- */
        .breadcrumb-nav {
            background: #ffffff;
            border-bottom: 1px solid var(--border);
            padding: 15px 0;
        }

        .breadcrumb {
            margin: 0;
            padding: 0;
            background: transparent;
        }

        .breadcrumb-item {
            color: var(--text-muted);
            font-size: 0.92rem;
        }

        .breadcrumb-item a {
            color: var(--text-muted);
            text-decoration: none;
            transition: var(--transition);
        }

        .breadcrumb-item a:hover {
            color: var(--accent-blue);
        }

        .breadcrumb-item.active {
            color: var(--primary);
            font-weight: 500;
        }

        .breadcrumb-item + .breadcrumb-item::before {
            content: '\f054';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.65rem;
            color: #b0b8c4;
            padding: 0 8px;
        }

        /* ---------- Article Section ---------- */
        .article-section {
            padding: 48px 0 70px;
            background: var(--bg-light);
        }

        .article-main {
            background: var(--bg-white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 42px 48px;
            border: 1px solid rgba(13, 27, 42, 0.03);
        }

        .article-meta-line {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            padding-bottom: 22px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 28px;
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .article-meta-line span {
            display: inline-flex;
            align-items: center;
            gap: 7px;
        }

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

        .article-content {
            font-size: 1.05rem;
            line-height: 1.95;
            color: #334155;
        }

        .article-content h2 {
            font-size: 1.7rem;
            font-weight: 700;
            margin: 2.2rem 0 1.1rem;
            padding-bottom: 0.6rem;
            border-bottom: 2px solid var(--border);
            color: var(--primary);
        }

        .article-content h3 {
            font-size: 1.35rem;
            font-weight: 600;
            margin: 1.8rem 0 0.9rem;
            color: var(--primary);
        }

        .article-content h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin: 1.5rem 0 0.7rem;
            color: var(--primary);
        }

        .article-content p {
            margin-bottom: 1.3rem;
        }

        .article-content ul,
        .article-content ol {
            margin: 0 0 1.4rem 1.4rem;
            padding: 0;
        }

        .article-content li {
            margin-bottom: 0.6rem;
        }

        .article-content img {
            max-width: 100%;
            border-radius: 12px;
            margin: 1.5rem 0;
            box-shadow: 0 4px 18px rgba(0, 0, 0, 0.08);
        }

        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: rgba(0, 229, 255, 0.06);
            padding: 18px 24px;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
            color: #475569;
            font-style: italic;
        }

        .article-content a {
            color: var(--accent-blue);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-content a:hover {
            color: #0077cc;
        }

        /* 文章标签 */
        .article-tags {
            margin-top: 36px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
        }

        .article-tags .tag-label {
            color: var(--text-muted);
            font-weight: 600;
            font-size: 0.9rem;
        }

        .tag {
            display: inline-block;
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.2);
            color: #0e7490;
            padding: 5px 14px;
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 500;
            transition: var(--transition);
        }

        .tag:hover {
            background: rgba(0, 229, 255, 0.16);
            border-color: rgba(0, 229, 255, 0.4);
            color: #0e7490;
        }

        /* 空状态 */
        .article-empty {
            text-align: center;
            padding: 70px 30px;
        }

        .article-empty i {
            font-size: 3.5rem;
            color: #b0b8c4;
            margin-bottom: 18px;
        }

        .article-empty h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 12px;
        }

        .article-empty p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }

        .btn-back-home {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, var(--accent), var(--accent-blue));
            color: var(--primary);
            font-weight: 700;
            padding: 12px 30px;
            border-radius: 10px;
            border: none;
            box-shadow: 0 4px 18px rgba(0, 229, 255, 0.25);
            transition: var(--transition);
        }

        .btn-back-home:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(0, 229, 255, 0.35);
            color: var(--primary);
        }

        /* ---------- Sidebar ---------- */
        .sidebar-widget {
            background: var(--bg-white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 28px;
            margin-bottom: 24px;
            border: 1px solid rgba(13, 27, 42, 0.03);
        }

        .widget-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--accent);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .widget-title i {
            color: var(--accent-blue);
        }

        .widget-cover {
            border-radius: 12px;
            overflow: hidden;
            margin-bottom: 16px;
            position: relative;
        }

        .widget-cover img {
            width: 100%;
            height: 130px;
            object-fit: cover;
            display: block;
        }

        .widget-cover::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(0deg, rgba(13, 27, 42, 0.25), transparent);
        }

        .widget-about p {
            color: var(--text-muted);
            font-size: 0.94rem;
            margin-bottom: 18px;
        }

        .btn-outline-widget {
            border: 1px solid rgba(0, 229, 255, 0.5);
            color: #0e7490;
            background: transparent;
            padding: 8px 16px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            width: 100%;
        }

        .btn-outline-widget:hover {
            background: rgba(0, 229, 255, 0.1);
            color: #0e7490;
            border-color: var(--accent);
        }

        /* 侧边栏链接 */
        .widget-links {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .widget-links li {
            margin-bottom: 4px;
        }

        .widget-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-main);
            padding: 9px 12px;
            border-radius: 8px;
            font-size: 0.92rem;
            transition: var(--transition);
        }

        .widget-links a:hover {
            background: rgba(0, 229, 255, 0.06);
            color: #0e7490;
            padding-left: 16px;
        }

        .widget-links a i {
            color: var(--accent-blue);
            font-size: 0.75rem;
        }

        /* 侧边栏文章列表 */
        .widget-post-item {
            display: flex;
            gap: 14px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
            align-items: center;
            text-decoration: none;
            color: inherit;
        }

        .widget-post-item:last-child {
            border-bottom: none;
        }

        .widget-post-item:hover {
            padding-left: 6px;
        }

        .widget-post-item .post-thumb {
            width: 70px;
            height: 58px;
            flex-shrink: 0;
            border-radius: 8px;
            overflow: hidden;
            background: #e8ecf1;
        }

        .widget-post-item .post-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }

        .widget-post-item .post-info h4 {
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--text-main);
            margin: 0 0 4px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .widget-post-item .post-info span {
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        /* ---------- Related Section ---------- */
        .related-section {
            padding: 70px 0 60px;
            background: var(--bg-white);
            border-top: 1px solid var(--border);
        }

        .section-head {
            text-align: center;
            margin-bottom: 42px;
        }

        .section-head .section-title {
            font-size: 1.9rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .section-head .section-subtitle {
            color: var(--text-muted);
            font-size: 1rem;
            max-width: 600px;
            margin: 0 auto;
        }

        .section-head .section-line {
            width: 64px;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--accent-blue));
            border-radius: 4px;
            margin: 18px auto 0;
        }

        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            display: block;
            height: 100%;
            text-decoration: none;
            color: inherit;
            border: 1px solid rgba(13, 27, 42, 0.04);
        }

        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            color: inherit;
        }

        .related-cover {
            position: relative;
            height: 190px;
            overflow: hidden;
        }

        .related-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: transform 0.5s ease;
            border-radius: 0;
        }

        .related-card:hover .related-cover img {
            transform: scale(1.06);
        }

        .related-cover::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(0deg, rgba(13, 27, 42, 0.3), transparent 60%);
        }

        .related-badge {
            position: absolute;
            top: 14px;
            left: 14px;
            z-index: 2;
            background: rgba(0, 229, 255, 0.92);
            color: var(--primary);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 700;
            backdrop-filter: blur(4px);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
        }

        .related-body {
            padding: 24px;
        }

        .related-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
            line-height: 1.45;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-body p {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 16px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-link {
            color: var(--accent-blue);
            font-weight: 600;
            font-size: 0.88rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .related-card:hover .related-link i {
            transform: translateX(4px);
        }

        .related-link i {
            transition: transform 0.3s ease;
        }

        /* ---------- CTA Section ---------- */
        .cta-section {
            padding: 60px 0;
            background: var(--primary);
            position: relative;
            overflow: hidden;
            isolation: isolate;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            z-index: -1;
            background: radial-gradient(circle at 20% 50%, rgba(0, 229, 255, 0.12), transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(0, 168, 255, 0.1), transparent 45%);
        }

        .cta-box {
            text-align: center;
            max-width: 720px;
            margin: 0 auto;
        }

        .cta-box h2 {
            color: #ffffff;
            font-size: 1.9rem;
            font-weight: 800;
            margin-bottom: 14px;
        }

        .cta-box p {
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 32px;
            font-size: 1rem;
        }

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

        .btn-cta-primary {
            background: linear-gradient(135deg, var(--accent), var(--accent-blue));
            color: var(--primary);
            font-weight: 700;
            padding: 14px 34px;
            border-radius: 12px;
            border: none;
            font-size: 1rem;
            box-shadow: 0 6px 24px rgba(0, 229, 255, 0.3);
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .btn-cta-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 36px rgba(0, 229, 255, 0.4);
            color: var(--primary);
        }

        .btn-cta-outline {
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.4);
            color: #ffffff;
            font-weight: 600;
            padding: 12px 30px;
            border-radius: 12px;
            font-size: 1rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .btn-cta-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(0, 229, 255, 0.06);
        }

        /* ---------- Footer ---------- */
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.65);
            padding: 60px 0 0;
            border-top: 2px solid rgba(0, 229, 255, 0.35);
        }

        .footer-brand {
            font-size: 1.35rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--accent), var(--accent-blue));
            color: var(--primary);
            border-radius: 8px;
            font-size: 0.95rem;
            box-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
        }

        .footer-desc {
            font-size: 0.92rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.6);
            max-width: 340px;
        }

        .footer-title {
            color: #ffffff;
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 34px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }

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

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

        .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.92rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

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

        .footer-links a i {
            font-size: 0.75rem;
            color: rgba(0, 229, 255, 0.7);
        }

        .footer-bottom {
            margin-top: 40px;
            padding: 20px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }

        .footer-bottom a {
            color: rgba(0, 229, 255, 0.75);
        }

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

        /* ---------- Responsive ---------- */
        @media (max-width: 991px) {
            .navbar-collapse {
                background: var(--primary);
                border-radius: 14px;
                padding: 18px;
                margin-top: 12px;
                border: 1px solid rgba(255, 255, 255, 0.08);
            }

            .navbar-nav {
                gap: 4px;
                margin-bottom: 14px;
            }

            .nav-link {
                padding: 10px 14px;
            }

            .btn-nav-cta {
                margin-left: 0;
                width: 100%;
                justify-content: center;
            }

            .article-banner {
                padding: 70px 0 56px;
            }

            .banner-inner h1 {
                font-size: 2rem;
            }

            .article-main {
                padding: 30px 28px;
            }

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

        @media (max-width: 767px) {
            .article-section {
                padding: 36px 0 50px;
            }

            .article-banner {
                padding: 54px 0 44px;
            }

            .banner-inner h1 {
                font-size: 1.6rem;
            }

            .banner-meta {
                gap: 12px;
                font-size: 0.85rem;
            }

            .article-main {
                padding: 24px 18px;
            }

            .article-content {
                font-size: 1rem;
            }

            .article-content h2 {
                font-size: 1.4rem;
            }

            .article-content h3 {
                font-size: 1.2rem;
            }

            .sidebar-widget {
                padding: 22px;
            }

            .related-section {
                padding: 50px 0 40px;
            }

            .related-cover {
                height: 170px;
            }

            .cta-section {
                padding: 44px 0;
            }

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

            .cta-actions {
                flex-direction: column;
                gap: 12px;
            }

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

            .footer-bottom {
                padding: 16px 0;
            }
        }

        @media (max-width: 520px) {
            .article-meta-line {
                gap: 12px;
                font-size: 0.82rem;
            }

            .article-tags {
                gap: 8px;
            }

            .tag {
                padding: 4px 10px;
                font-size: 0.78rem;
            }

            .widget-post-item .post-thumb {
                width: 60px;
                height: 52px;
            }

            .related-body {
                padding: 18px;
            }

            .related-body h3 {
                font-size: 1rem;
            }

            .banner-badge {
                font-size: 0.78rem;
                padding: 5px 14px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #22d3ee;
            --primary-dark: #0891b2;
            --primary-glow: rgba(34, 211, 238, .35);
            --secondary: #8b5cf6;
            --accent: #f59e0b;
            --dark-bg: #0b0f1a;
            --dark-card: #111827;
            --dark-border: rgba(148, 163, 184, .15);
            --light-bg: #f8fafc;
            --text-light: #f1f5f9;
            --text-body: #475569;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --radius: 16px;
            --radius-lg: 24px;
            --shadow: 0 20px 60px rgba(15, 23, 42, .08);
            --shadow-dark: 0 20px 50px rgba(0, 0, 0, .35);
            --space-section: 96px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background: #fff;
            color: var(--text-body);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color .25s;
        }

        a:hover {
            color: var(--primary-dark);
        }

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

        button,
        input,
        textarea {
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
        }

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

        .section-light {
            background: var(--light-bg);
        }

        .section-dark {
            background: var(--dark-bg);
            color: var(--text-light);
        }

        .section-head {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 56px;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(34, 211, 238, .1);
            color: var(--primary-dark);
            border: 1px solid rgba(34, 211, 238, .25);
            border-radius: 50px;
            padding: .3rem 1rem;
            font-size: .85rem;
            font-weight: 600;
            letter-spacing: .5px;
            text-transform: uppercase;
            margin-bottom: 16px;
        }

        .section-tag.light {
            color: var(--primary);
            background: rgba(34, 211, 238, .12);
            border-color: rgba(34, 211, 238, .3);
        }

        .section-head h2 {
            font-size: clamp(1.8rem, 3.2vw, 2.5rem);
            font-weight: 700;
            color: #0f172a;
            line-height: 1.3;
            margin-bottom: 14px;
        }

        .section-dark .section-head h2 {
            color: #fff;
        }

        .section-head p {
            font-size: 1.05rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        .section-dark .section-head p {
            color: #94a3b8;
        }

        /* ---------- Header / Nav ---------- */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(11, 15, 26, .92);
            backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(34, 211, 238, .15);
            box-shadow: 0 4px 30px rgba(0, 0, 0, .25);
        }

        .navbar {
            padding: .85rem 0;
            position: relative;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: .6rem;
            color: #fff;
            font-size: 1.3rem;
            font-weight: 700;
            letter-spacing: .5px;
            line-height: 1;
        }

        .navbar-brand:hover {
            color: var(--primary);
        }

        .brand-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, #22d3ee, #0284c7);
            border-radius: 12px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            box-shadow: 0 0 18px rgba(34, 211, 238, .4);
            flex-shrink: 0;
        }

        .navbar-nav {
            gap: .2rem;
        }

        .nav-link {
            color: #cbd5e1;
            font-weight: 500;
            padding: .55rem 1rem !important;
            border-radius: 10px;
            transition: all .25s ease;
            position: relative;
        }

        .nav-link:hover,
        .nav-link:focus-visible {
            color: var(--primary);
            background: rgba(34, 211, 238, .08);
            outline: none;
        }

        .nav-link.active {
            color: var(--primary) !important;
            text-shadow: 0 0 14px rgba(34, 211, 238, .6);
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 26px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
            box-shadow: 0 0 12px rgba(34, 211, 238, .7);
        }

        .btn-nav-cta {
            background: linear-gradient(135deg, #22d3ee, #0891b2);
            border: none;
            border-radius: 50px;
            color: #fff;
            font-weight: 600;
            font-size: .9rem;
            padding: .6rem 1.5rem;
            margin-left: 1rem;
            box-shadow: 0 4px 20px rgba(34, 211, 238, .25);
            transition: all .3s ease;
            white-space: nowrap;
        }

        .btn-nav-cta:hover,
        .btn-nav-cta:focus-visible {
            transform: translateY(-2px);
            color: #fff;
            box-shadow: 0 10px 30px rgba(34, 211, 238, .4);
            outline: none;
        }

        .btn-nav-cta:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(34, 211, 238, .2);
        }

        .navbar-toggler {
            border: 1px solid rgba(34, 211, 238, .4);
            border-radius: 8px;
            padding: .35rem .5rem;
            background: transparent;
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(34,211,238,0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* ---------- Page Hero ---------- */
        .page-hero {
            position: relative;
            padding: 120px 0 110px;
            background-size: cover;
            background-position: center;
            overflow: hidden;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 15, 26, .93) 0%, rgba(15, 23, 42, .78) 50%, rgba(8, 47, 73, .85) 100%);
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 820px;
            margin: 0 auto;
            color: var(--text-light);
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(34, 211, 238, .15);
            border: 1px solid rgba(34, 211, 238, .35);
            border-radius: 50px;
            padding: .4rem 1.2rem;
            font-size: .9rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }

        .hero-content h1 {
            font-size: clamp(2rem, 4.5vw, 3.2rem);
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 18px;
            color: #fff;
            text-shadow: 0 4px 30px rgba(0, 0, 0, .3);
        }

        .hero-content h1 span {
            color: var(--primary);
        }

        .hero-content p {
            font-size: 1.12rem;
            color: #cbd5e1;
            max-width: 620px;
            margin: 0 auto 32px;
            line-height: 1.8;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 36px;
        }

        .btn-primary-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, #22d3ee, #0891b2);
            border: none;
            color: #fff;
            border-radius: 50px;
            padding: .75rem 2rem;
            font-weight: 600;
            font-size: 1rem;
            box-shadow: 0 6px 28px rgba(34, 211, 238, .35);
            transition: all .3s ease;
        }

        .btn-primary-custom:hover {
            transform: translateY(-3px);
            color: #fff;
            box-shadow: 0 12px 38px rgba(34, 211, 238, .45);
        }

        .btn-outline-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, .35);
            color: #e2e8f0;
            border-radius: 50px;
            padding: .75rem 2rem;
            font-weight: 500;
            font-size: 1rem;
            transition: all .3s ease;
        }

        .btn-outline-custom:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(34, 211, 238, .08);
        }

        .hero-tags {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            color: #94a3b8;
            font-size: .92rem;
        }

        .hero-tags span {
            display: inline-flex;
            align-items: center;
            gap: 7px;
        }

        .hero-tags i {
            color: var(--primary);
            font-size: 1rem;
        }

        /* ---------- Feature Cards ---------- */
        .feature-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 32px 26px;
            height: 100%;
            border: 1px solid var(--border-light);
            box-shadow: 0 8px 30px rgba(15, 23, 42, .04);
            transition: all .35s ease;
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform .4s ease;
        }

        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow);
            border-color: rgba(34, 211, 238, .2);
        }

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

        .feature-icon {
            width: 58px;
            height: 58px;
            border-radius: 16px;
            background: linear-gradient(135deg, rgba(34, 211, 238, .12), rgba(139, 92, 246, .12));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--primary-dark);
            margin-bottom: 20px;
            transition: all .3s ease;
        }

        .feature-card:hover .feature-icon {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            box-shadow: 0 8px 24px rgba(34, 211, 238, .35);
        }

        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 12px;
        }

        .feature-card p {
            font-size: .94rem;
            color: var(--text-muted);
            line-height: 1.75;
            margin-bottom: 0;
        }

        /* ---------- Process ---------- */
        .process-card {
            background: rgba(17, 24, 39, .6);
            border: 1px solid rgba(148, 163, 184, .15);
            border-radius: var(--radius);
            padding: 36px 30px;
            height: 100%;
            position: relative;
            text-align: center;
            transition: all .35s ease;
        }

        .process-card:hover {
            border-color: rgba(34, 211, 238, .4);
            box-shadow: 0 10px 40px rgba(0, 0, 0, .3);
            transform: translateY(-4px);
        }

        .process-step {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: linear-gradient(135deg, #22d3ee, #0891b2);
            color: #fff;
            font-weight: 700;
            font-size: 1.05rem;
            margin-bottom: 20px;
            box-shadow: 0 0 20px rgba(34, 211, 238, .4);
            position: relative;
            z-index: 2;
        }

        .process-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: rgba(34, 211, 238, .1);
            border: 1px solid rgba(34, 211, 238, .2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
            margin: 0 auto 20px;
        }

        .process-card h3 {
            color: #fff;
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .process-card p {
            color: #94a3b8;
            font-size: .9rem;
            line-height: 1.7;
            margin-bottom: 0;
        }

        .process-connector {
            display: none;
        }

        @media (min-width: 992px) {
            .process-connector {
                display: block;
                position: absolute;
                top: 50%;
                right: -12px;
                width: 24px;
                height: 2px;
                background: linear-gradient(90deg, rgba(34, 211, 238, .7), rgba(34, 211, 238, .1));
                z-index: 1;
            }
        }

        /* ---------- Stats ---------- */
        .stats-section {
            position: relative;
            padding: 90px 0;
            background-size: cover;
            background-position: center;
        }

        .stats-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 15, 26, .92), rgba(8, 47, 73, .85));
        }

        .stats-inner {
            position: relative;
            z-index: 2;
        }

        .stat-item {
            text-align: center;
            padding: 30px 20px;
            border-radius: var(--radius);
            background: rgba(255, 255, 255, .04);
            border: 1px solid rgba(255, 255, 255, .08);
            backdrop-filter: blur(6px);
            transition: all .35s ease;
            height: 100%;
        }

        .stat-item:hover {
            background: rgba(34, 211, 238, .08);
            border-color: rgba(34, 211, 238, .3);
            transform: translateY(-4px);
        }

        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 8px;
            text-shadow: 0 0 24px rgba(34, 211, 238, .5);
        }

        .stat-label {
            color: #cbd5e1;
            font-size: .95rem;
            font-weight: 500;
        }

        /* ---------- Articles ---------- */
        .article-card {
            background: #fff;
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: 0 6px 24px rgba(15, 23, 42, .04);
            height: 100%;
            display: flex;
            flex-direction: column;
            transition: all .35s ease;
        }

        .article-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow);
            border-color: rgba(34, 211, 238, .2);
        }

        .article-cover {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
        }

        .article-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .5s ease;
        }

        .article-card:hover .article-cover img {
            transform: scale(1.05);
        }

        .article-cover::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15, 23, 42, .25), transparent 60%);
        }

        .article-tag {
            position: absolute;
            top: 14px;
            left: 14px;
            z-index: 2;
            background: rgba(11, 15, 26, .7);
            backdrop-filter: blur(6px);
            color: var(--primary);
            font-size: .78rem;
            font-weight: 600;
            padding: .25rem .8rem;
            border-radius: 50px;
            border: 1px solid rgba(34, 211, 238, .3);
        }

        .article-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .article-meta {
            font-size: .82rem;
            color: #94a3b8;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 10px;
        }

        .article-body h3 {
            font-size: 1.08rem;
            font-weight: 700;
            color: #0f172a;
            line-height: 1.5;
            margin-bottom: 12px;
        }

        .article-body p {
            font-size: .92rem;
            color: var(--text-muted);
            line-height: 1.75;
            margin-bottom: 16px;
            flex: 1;
        }

        .article-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary-dark);
            font-weight: 600;
            font-size: .9rem;
            margin-top: auto;
        }

        .article-link:hover {
            gap: 10px;
            color: var(--primary);
        }

        /* ---------- FAQ ---------- */
        .faq-wrap {
            max-width: 820px;
            margin: 0 auto;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            margin-bottom: 16px;
            transition: all .3s ease;
        }

        .faq-item:hover {
            border-color: rgba(34, 211, 238, .25);
            box-shadow: 0 8px 24px rgba(15, 23, 42, .05);
        }

        .faq-question {
            padding: 22px 26px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: #0f172a;
            margin: 0;
            user-select: none;
        }

        .faq-question i {
            color: var(--primary);
            font-size: 1.1rem;
            transition: transform .3s ease;
            flex-shrink: 0;
        }

        .faq-item.open .faq-question i {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }

        .faq-answer-inner {
            padding: 0 26px 22px;
            color: var(--text-muted);
            font-size: .95rem;
            line-height: 1.8;
        }

        /* ---------- CTA ---------- */
        .cta-section {
            position: relative;
            padding: 90px 0;
            background: linear-gradient(135deg, #0b0f1a, #0f1d33);
            overflow: hidden;
            text-align: center;
        }

        .cta-section::before {
            content: "";
            position: absolute;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(34, 211, 238, .15);
            filter: blur(100px);
            top: -100px;
            left: -100px;
        }

        .cta-section::after {
            content: "";
            position: absolute;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(139, 92, 246, .12);
            filter: blur(90px);
            bottom: -80px;
            right: -80px;
        }

        .cta-inner {
            position: relative;
            z-index: 2;
        }

        .cta-inner h2 {
            color: #fff;
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .cta-inner p {
            color: #94a3b8;
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto 36px;
        }

        /* ---------- Footer ---------- */
        .site-footer {
            background: #080c14;
            color: #94a3b8;
            padding: 70px 0 24px;
            border-top: 1px solid rgba(34, 211, 238, .1);
        }

        .footer-brand {
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: .6rem;
            margin-bottom: 14px;
        }

        .footer-desc {
            font-size: .92rem;
            line-height: 1.8;
            color: #64748b;
            margin-bottom: 0;
            max-width: 320px;
        }

        .footer-title {
            color: #e2e8f0;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-title::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 28px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            box-shadow: 0 0 10px rgba(34, 211, 238, .5);
        }

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

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

        .footer-links a {
            color: #64748b;
            font-size: .92rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all .25s;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(148, 163, 184, .1);
            margin-top: 50px;
            padding-top: 22px;
            text-align: center;
            font-size: .85rem;
            color: #475569;
        }

        .footer-bottom a {
            color: var(--primary);
        }

        /* ---------- Responsive ---------- */
        @media (max-width: 991.98px) {
            :root {
                --space-section: 72px;
            }

            .navbar-collapse {
                background: rgba(11, 15, 26, .98);
                border-radius: 16px;
                padding: 16px 20px;
                margin-top: 14px;
                border: 1px solid rgba(34, 211, 238, .15);
            }

            .navbar-nav {
                gap: .2rem;
                margin-bottom: 10px;
            }

            .nav-link {
                padding: .7rem 1rem !important;
            }

            .nav-link.active::after {
                display: none;
            }

            .btn-nav-cta {
                margin-left: 0;
                width: 100%;
                justify-content: center;
                text-align: center;
                display: flex;
                align-items: center;
            }

            .page-hero {
                padding: 90px 0 80px;
            }

            .hero-actions {
                gap: 12px;
            }
        }

        @media (max-width: 767.98px) {
            :root {
                --space-section: 56px;
            }

            .page-hero {
                padding: 70px 0 60px;
            }

            .hero-content h1 {
                font-size: 1.8rem;
            }

            .hero-content p {
                font-size: 1rem;
            }

            .hero-tags {
                gap: 12px;
                font-size: .85rem;
            }

            .stat-number {
                font-size: 1.8rem;
            }

            .faq-question {
                padding: 18px 20px;
                font-size: .95rem;
            }

            .faq-answer-inner {
                padding: 0 20px 18px;
            }
        }

        @media (max-width: 520px) {
            .hero-actions .btn-primary-custom,
            .hero-actions .btn-outline-custom {
                width: 100%;
                justify-content: center;
            }

            .hero-tags {
                flex-direction: column;
                gap: 6px;
            }
        }