/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f1221;
            --primary-light: #1a1f3a;
            --primary-dark: #080a14;
            --accent: #f0b429;
            --accent-light: #f7d070;
            --accent-dark: #c9940a;
            --star-blue: #4fc3f7;
            --star-blue-dark: #0288d1;
            --nebula: #7c4dff;
            --text-light: #f0f2f8;
            --text-muted: #9ea3b8;
            --text-dark: #1a1f3a;
            --card-bg: rgba(255, 255, 255, 0.04);
            --card-border: rgba(255, 255, 255, 0.08);
            --glass-bg: rgba(15, 18, 33, 0.75);
            --glass-border: rgba(255, 255, 255, 0.10);
            --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 16px 56px rgba(0, 0, 0, 0.45);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --nav-width: 260px;
            --nav-collapsed: 72px;
            --header-height: 0px;
            --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --font-display: 'Inter', 'SF Pro Display', 'PingFang SC', sans-serif;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-light);
            background: var(--primary);
            display: flex;
            min-height: 100vh;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }

        /* ===== 滚动条 ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--primary-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--primary-light);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--accent-dark);
        }

        /* ===== 左侧导航 ===== */
        .app-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--primary-dark);
            border-right: 1px solid var(--card-border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition), width var(--transition);
            overflow-y: auto;
            overflow-x: hidden;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .app-nav .nav-header {
            padding: 28px 24px 20px;
            display: flex;
            align-items: center;
            gap: 14px;
            border-bottom: 1px solid var(--card-border);
            flex-shrink: 0;
        }
        .app-nav .nav-logo {
            width: 42px;
            height: 42px;
            background: linear-gradient(135deg, var(--accent), var(--nebula));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 4px 16px rgba(240, 180, 41, 0.25);
        }
        .app-nav .nav-brand {
            font-family: var(--font-display);
            font-size: 18px;
            font-weight: 700;
            color: var(--text-light);
            letter-spacing: 0.5px;
            line-height: 1.2;
        }
        .app-nav .nav-brand small {
            display: block;
            font-size: 11px;
            font-weight: 400;
            color: var(--text-muted);
            letter-spacing: 1px;
            text-transform: uppercase;
        }
        .app-nav .nav-links {
            padding: 20px 16px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .app-nav .nav-links a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
            transition: var(--transition);
            position: relative;
        }
        .app-nav .nav-links a i {
            width: 22px;
            text-align: center;
            font-size: 18px;
            flex-shrink: 0;
        }
        .app-nav .nav-links a:hover {
            color: var(--text-light);
            background: var(--card-bg);
        }
        .app-nav .nav-links a.active {
            color: var(--accent);
            background: rgba(240, 180, 41, 0.08);
        }
        .app-nav .nav-links a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--accent);
            border-radius: 0 4px 4px 0;
        }
        .app-nav .nav-footer {
            padding: 20px 24px;
            border-top: 1px solid var(--card-border);
            flex-shrink: 0;
        }
        .app-nav .nav-footer .social-links {
            display: flex;
            gap: 12px;
        }
        .app-nav .nav-footer .social-links a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--card-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 16px;
            transition: var(--transition);
        }
        .app-nav .nav-footer .social-links a:hover {
            color: var(--accent);
            background: rgba(240, 180, 41, 0.12);
            transform: translateY(-2px);
        }

        /* ===== 主内容区 ===== */
        .app-main {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            background: var(--primary);
            position: relative;
        }

        /* ===== 移动端导航切换 ===== */
        .nav-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--glass-border);
            color: var(--text-light);
            font-size: 20px;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-light);
        }
        .nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            z-index: 999;
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
        }

        /* ===== 通用容器 ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
            width: 100%;
        }
        .container-narrow {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 32px;
        }
        .section {
            padding: 80px 0;
            position: relative;
        }
        .section-title {
            font-family: var(--font-display);
            font-size: 36px;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 12px;
            letter-spacing: -0.5px;
            line-height: 1.25;
        }
        .section-subtitle {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 600px;
            line-height: 1.6;
            margin-bottom: 48px;
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 12px;
            padding: 4px 14px;
            border-radius: 100px;
            background: rgba(240, 180, 41, 0.08);
            border: 1px solid rgba(240, 180, 41, 0.15);
        }
        .text-center {
            text-align: center;
        }
        .text-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== Hero 区域 ===== */
        .hero {
            position: relative;
            min-height: 85vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center;
            opacity: 0.55;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 30% 40%, rgba(15, 18, 33, 0.40) 0%, var(--primary) 80%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
            padding-top: 60px;
            padding-bottom: 60px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 20px;
            border-radius: 100px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.10);
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 28px;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }
        .hero-badge i {
            color: var(--accent);
            font-size: 14px;
        }
        .hero h1 {
            font-family: var(--font-display);
            font-size: 56px;
            font-weight: 800;
            color: var(--text-light);
            line-height: 1.1;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent), var(--nebula));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 20px;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            align-items: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 100px;
            font-size: 16px;
            font-weight: 600;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary-dark);
            box-shadow: 0 4px 20px rgba(240, 180, 41, 0.30);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(240, 180, 41, 0.40);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-light);
            border: 1.5px solid rgba(255, 255, 255, 0.20);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(240, 180, 41, 0.06);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 14px;
            gap: 8px;
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            justify-content: center;
            margin-top: 52px;
            padding-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-family: var(--font-display);
            font-size: 32px;
            font-weight: 700;
            color: var(--text-light);
            display: block;
        }
        .hero-stat .label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* ===== 卡片系统 ===== */
        .card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: var(--transition);
        }
        .card:hover {
            border-color: rgba(255, 255, 255, 0.15);
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: rgba(240, 180, 41, 0.10);
            border: 1px solid rgba(240, 180, 41, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--accent);
            margin-bottom: 18px;
        }
        .card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 10px;
            line-height: 1.3;
        }
        .card p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .card .card-tag {
            display: inline-block;
            padding: 3px 12px;
            border-radius: 100px;
            font-size: 12px;
            font-weight: 500;
            background: rgba(79, 195, 247, 0.10);
            color: var(--star-blue);
            border: 1px solid rgba(79, 195, 247, 0.12);
            margin-bottom: 12px;
        }

        /* ===== 网格 ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        /* ===== 特色区块 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--nebula));
            opacity: 0;
            transition: var(--transition);
        }
        .feature-card:hover::after {
            opacity: 1;
        }
        .feature-card:hover {
            border-color: rgba(255, 255, 255, 0.12);
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .feature-card .fc-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: rgba(240, 180, 41, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--accent);
            margin-bottom: 18px;
        }
        .feature-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 8px;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== 分类入口 ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            height: 260px;
            display: flex;
            align-items: flex-end;
            background: var(--primary-light);
            border: 1px solid var(--card-border);
            transition: var(--transition);
            cursor: pointer;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(255, 255, 255, 0.15);
        }
        .category-card img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.5;
            transition: var(--transition);
        }
        .category-card:hover img {
            opacity: 0.7;
            transform: scale(1.05);
        }
        .category-card .cc-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(0deg, rgba(15, 18, 33, 0.85) 20%, transparent 60%);
            z-index: 1;
        }
        .category-card .cc-content {
            position: relative;
            z-index: 2;
            padding: 28px;
            width: 100%;
        }
        .category-card .cc-content h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 6px;
        }
        .category-card .cc-content p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 12px;
        }
        .category-card .cc-content .cc-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 12px;
            font-weight: 500;
            background: rgba(240, 180, 41, 0.12);
            color: var(--accent);
            border: 1px solid rgba(240, 180, 41, 0.15);
        }

        /* ===== 资讯列表 ===== */
        .post-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .post-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .post-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: rgba(255, 255, 255, 0.12);
        }
        .post-card .pc-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
        }
        .post-card .pc-body {
            padding: 22px 24px 24px;
        }
        .post-card .pc-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .post-card .pc-meta .pc-cat {
            padding: 2px 10px;
            border-radius: 100px;
            background: rgba(79, 195, 247, 0.08);
            color: var(--star-blue);
            font-size: 11px;
            font-weight: 500;
            border: 1px solid rgba(79, 195, 247, 0.10);
        }
        .post-card .pc-meta .pc-date {
            font-size: 12px;
        }
        .post-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .pc-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 14px;
            font-size: 14px;
            font-weight: 500;
            color: var(--accent);
        }
        .post-card .pc-link i {
            font-size: 12px;
            transition: var(--transition);
        }
        .post-card .pc-link:hover i {
            transform: translateX(4px);
        }

        /* ===== 路径/流程 ===== */
        .journey {
            background: var(--primary-dark);
            position: relative;
        }
        .journey::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 1px;
            height: 100%;
            background: linear-gradient(to bottom, transparent, var(--card-border), transparent);
        }
        .journey-steps {
            display: flex;
            flex-direction: column;
            gap: 40px;
            position: relative;
        }
        .journey-step {
            display: flex;
            align-items: flex-start;
            gap: 28px;
            position: relative;
        }
        .journey-step .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-light);
            border: 2px solid var(--card-border);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: var(--accent);
            flex-shrink: 0;
            transition: var(--transition);
        }
        .journey-step:hover .step-num {
            border-color: var(--accent);
            background: rgba(240, 180, 41, 0.08);
        }
        .journey-step .step-content h4 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 6px;
        }
        .journey-step .step-content p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 480px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(255, 255, 255, 0.10);
        }
        .faq-item .faq-q {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 500;
            font-size: 16px;
            color: var(--text-light);
            cursor: pointer;
            transition: var(--transition);
            gap: 16px;
        }
        .faq-item .faq-q i {
            font-size: 14px;
            color: var(--text-muted);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item .faq-q:hover {
            color: var(--accent);
        }
        .faq-item .faq-q:hover i {
            color: var(--accent);
        }
        .faq-item .faq-a {
            padding: 0 24px 18px;
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-a {
            display: block;
        }
        .faq-item.active .faq-q i {
            transform: rotate(180deg);
            color: var(--accent);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-light), var(--primary-dark));
            border-top: 1px solid var(--card-border);
            border-bottom: 1px solid var(--card-border);
        }
        .cta-box {
            background: linear-gradient(145deg, rgba(240, 180, 41, 0.06), rgba(124, 77, 255, 0.06));
            border: 1px solid rgba(240, 180, 41, 0.12);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -30%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(240, 180, 41, 0.06), transparent 70%);
            pointer-events: none;
        }
        .cta-box h2 {
            font-family: var(--font-display);
            font-size: 34px;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .cta-box p {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 520px;
            margin: 0 auto 28px;
        }

        /* ===== 页脚 ===== */
        .app-footer {
            background: var(--primary-dark);
            border-top: 1px solid var(--card-border);
            padding: 48px 0 32px;
            margin-top: auto;
        }
        .app-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid var(--card-border);
        }
        .app-footer .footer-brand .fb-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
        }
        .app-footer .footer-brand .fb-logo .fb-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--accent), var(--nebula));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
        }
        .app-footer .footer-brand .fb-logo span {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-light);
        }
        .app-footer .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 320px;
        }
        .app-footer h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 16px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .app-footer .footer-links a {
            display: block;
            padding: 4px 0;
            font-size: 14px;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .app-footer .footer-links a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .app-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .app-footer .footer-bottom a {
            color: var(--text-muted);
        }
        .app-footer .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== 空状态 ===== */
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
        }
        .empty-state i {
            font-size: 42px;
            margin-bottom: 16px;
            color: var(--card-border);
        }
        .empty-state p {
            font-size: 16px;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1200px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .post-list {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .app-footer .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
            .hero h1 {
                font-size: 44px;
            }
        }

        @media (max-width: 820px) {
            .app-nav {
                transform: translateX(-100%);
                width: 280px;
            }
            .app-nav.open {
                transform: translateX(0);
            }
            .nav-toggle {
                display: flex;
            }
            .nav-overlay.show {
                display: block;
            }
            .app-main {
                margin-left: 0;
            }
            .hero h1 {
                font-size: 36px;
            }
            .hero p {
                font-size: 17px;
            }
            .section-title {
                font-size: 28px;
            }
            .container {
                padding: 0 20px;
            }
            .grid-2,
            .grid-3,
            .features-grid,
            .post-list,
            .category-grid {
                grid-template-columns: 1fr;
            }
            .cta-box {
                padding: 36px 24px;
            }
            .cta-box h2 {
                font-size: 26px;
            }
            .hero-stats {
                gap: 24px;
            }
            .hero-stat .num {
                font-size: 26px;
            }
            .section {
                padding: 56px 0;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 28px;
            }
            .hero p {
                font-size: 15px;
            }
            .hero {
                min-height: 70vh;
            }
            .btn {
                padding: 12px 24px;
                font-size: 14px;
            }
            .section-title {
                font-size: 24px;
            }
            .section-subtitle {
                font-size: 15px;
                margin-bottom: 32px;
            }
            .app-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .app-footer .footer-bottom {
                flex-direction: column;
                gap: 8px;
                text-align: center;
            }
            .container {
                padding: 0 16px;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
            }
            .journey-step {
                flex-direction: column;
                gap: 12px;
            }
            .journey-step .step-num {
                width: 40px;
                height: 40px;
                font-size: 15px;
            }
            .faq-item .faq-q {
                padding: 14px 18px;
                font-size: 14px;
            }
            .faq-item .faq-a {
                padding: 0 18px 14px;
                font-size: 14px;
            }
            .category-card {
                height: 200px;
            }
            .category-card .cc-content {
                padding: 20px;
            }
            .category-card .cc-content h3 {
                font-size: 18px;
            }
            .feature-card {
                padding: 24px 20px;
            }
            .card {
                padding: 22px 20px;
            }
        }

        @media (max-width: 380px) {
            .hero h1 {
                font-size: 24px;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .section-title {
                font-size: 22px;
            }
        }

        /* ===== 工具类 ===== */
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mt-40 {
            margin-top: 40px;
        }
        .mt-48 {
            margin-top: 48px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .mb-32 {
            margin-bottom: 32px;
        }
        .gap-16 {
            gap: 16px;
        }
        .gap-24 {
            gap: 24px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .d-none {
            display: none;
        }
        .d-block {
            display: block;
        }

        /* ===== 动画 ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-in {
            animation: fadeInUp 0.7s ease forwards;
        }
        .animate-in-d1 {
            animation-delay: 0.1s;
        }
        .animate-in-d2 {
            animation-delay: 0.2s;
        }
        .animate-in-d3 {
            animation-delay: 0.3s;
        }
        .animate-in-d4 {
            animation-delay: 0.4s;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #f0c040;
            --primary-hover: #f5d060;
            --primary-dim: rgba(240, 192, 64, 0.12);
            --accent: #4a7dff;
            --accent-hover: #6b96ff;
            --bg-deep: #070a1a;
            --bg-body: #0b0f2a;
            --bg-card: rgba(255, 255, 255, 0.04);
            --bg-card-hover: rgba(255, 255, 255, 0.08);
            --bg-elevated: rgba(255, 255, 255, 0.06);
            --text-primary: #f0f0f0;
            --text-secondary: #c8d0e0;
            --text-muted: #8899aa;
            --text-inverse: #0b0f2a;
            --border-light: rgba(255, 255, 255, 0.08);
            --border-medium: rgba(255, 255, 255, 0.12);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
            --shadow-float: 0 12px 40px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 40px rgba(240, 192, 64, 0.08);
            --nav-width: 240px;
            --nav-collapse: 64px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            display: flex;
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 600;
            color: var(--text-primary);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-deep);
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(255, 255, 255, 0.25);
        }

        /* ===== Left App Navigation ===== */
        .app-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--bg-deep);
            border-right: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition), width var(--transition);
            overflow-y: auto;
        }
        .nav-header {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 24px 20px 20px;
            border-bottom: 1px solid var(--border-light);
        }
        .nav-logo {
            width: 42px;
            height: 42px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--primary), #d4a030);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--text-inverse);
            flex-shrink: 0;
            box-shadow: 0 4px 16px rgba(240, 192, 64, 0.25);
        }
        .nav-brand {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.2;
        }
        .nav-brand small {
            display: block;
            font-size: 11px;
            font-weight: 400;
            color: var(--text-muted);
            letter-spacing: 1px;
            text-transform: uppercase;
        }
        .nav-links {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .nav-links a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
            position: relative;
        }
        .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .nav-links a:hover {
            background: var(--bg-card);
            color: var(--text-primary);
        }
        .nav-links a:hover i {
            color: var(--primary);
        }
        .nav-links a.active {
            background: var(--primary-dim);
            color: var(--primary);
        }
        .nav-links a.active i {
            color: var(--primary);
        }
        .nav-links a.active::before {
            content: '';
            position: absolute;
            left: -12px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            border-radius: 2px;
            background: var(--primary);
        }
        .nav-footer {
            padding: 16px 20px 24px;
            border-top: 1px solid var(--border-light);
        }
        .social-links {
            display: flex;
            gap: 12px;
            justify-content: center;
        }
        .social-links a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--bg-card);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 16px;
            transition: all var(--transition);
        }
        .social-links a:hover {
            background: var(--primary);
            color: var(--text-inverse);
            transform: translateY(-2px);
        }

        /* ===== Mobile Nav Toggle ===== */
        .nav-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--bg-deep);
            border: 1px solid var(--border-light);
            color: var(--text-primary);
            font-size: 20px;
            align-items: center;
            justify-content: center;
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
        }
        .nav-toggle:hover {
            background: var(--bg-card);
        }
        .nav-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(4px);
            z-index: 999;
        }

        /* ===== Main Content Area ===== */
        .main-wrap {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .main-content {
            flex: 1;
        }

        /* ===== Article Banner ===== */
        .article-banner {
            position: relative;
            min-height: 380px;
            display: flex;
            align-items: flex-end;
            padding: 60px 0 40px;
            background: var(--bg-deep) url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            overflow: hidden;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(7, 10, 26, 0.3) 0%, rgba(7, 10, 26, 0.85) 70%, var(--bg-body) 100%);
            pointer-events: none;
        }
        .article-banner .container {
            position: relative;
            z-index: 2;
        }
        .article-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .article-banner .breadcrumb a {
            color: var(--text-muted);
        }
        .article-banner .breadcrumb a:hover {
            color: var(--primary);
        }
        .article-banner .breadcrumb span {
            color: var(--text-secondary);
        }
        .article-banner .breadcrumb .sep {
            color: var(--text-muted);
            font-size: 10px;
        }
        .article-banner .cat-badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            background: var(--primary-dim);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
            border: 1px solid rgba(240, 192, 64, 0.2);
        }
        .article-banner h1 {
            font-size: clamp(28px, 4vw, 42px);
            font-weight: 700;
            color: #fff;
            max-width: 800px;
            line-height: 1.25;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            margin-top: 16px;
            font-size: 14px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .article-meta i {
            margin-right: 6px;
            color: var(--primary);
            opacity: 0.7;
        }
        .article-meta span {
            display: flex;
            align-items: center;
        }

        /* ===== Article Body ===== */
        .article-section {
            padding: 48px 0 64px;
        }
        .article-body {
            max-width: 800px;
            margin: 0 auto;
        }
        .article-content {
            font-size: 17px;
            line-height: 1.9;
            color: var(--text-secondary);
        }
        .article-content p {
            margin-bottom: 1.4em;
        }
        .article-content h2,
        .article-content h3,
        .article-content h4 {
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            color: var(--text-primary);
        }
        .article-content h2 {
            font-size: 24px;
        }
        .article-content h3 {
            font-size: 20px;
        }
        .article-content ul,
        .article-content ol {
            margin: 1em 0;
            padding-left: 24px;
        }
        .article-content ul li {
            list-style: disc;
            margin-bottom: 0.4em;
        }
        .article-content ol li {
            list-style: decimal;
            margin-bottom: 0.4em;
        }
        .article-content img {
            border-radius: var(--radius-md);
            margin: 1.5em 0;
            box-shadow: var(--shadow-card);
        }
        .article-content blockquote {
            border-left: 3px solid var(--primary);
            padding: 12px 20px;
            margin: 1.5em 0;
            background: var(--bg-card);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-content a {
            color: var(--accent);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-content a:hover {
            color: var(--accent-hover);
        }
        .article-content code {
            background: var(--bg-card);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--primary);
        }
        .article-content pre {
            background: var(--bg-deep);
            padding: 20px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 1.5em 0;
            border: 1px solid var(--border-light);
        }
        .article-content pre code {
            background: none;
            padding: 0;
            color: var(--text-secondary);
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
        }
        .article-tags .tag {
            padding: 6px 16px;
            border-radius: 20px;
            background: var(--bg-card);
            color: var(--text-muted);
            font-size: 13px;
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .article-tags .tag:hover {
            background: var(--primary-dim);
            color: var(--primary);
            border-color: rgba(240, 192, 64, 0.3);
        }
        .article-share {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 24px;
            padding-top: 20px;
            border-top: 1px solid var(--border-light);
        }
        .article-share span {
            font-size: 14px;
            color: var(--text-muted);
        }
        .article-share a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--bg-card);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 15px;
            transition: all var(--transition);
            border: 1px solid var(--border-light);
        }
        .article-share a:hover {
            background: var(--primary);
            color: var(--text-inverse);
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        /* ===== Related Articles ===== */
        .related-section {
            padding: 48px 0 64px;
            background: var(--bg-deep);
        }
        .related-section .section-title {
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .related-section .section-sub {
            color: var(--text-muted);
            margin-bottom: 32px;
            font-size: 15px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .related-card:hover {
            transform: translateY(-4px);
            border-color: rgba(240, 192, 64, 0.2);
            box-shadow: var(--shadow-float);
            background: var(--bg-card-hover);
        }
        .related-card .rc-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
            display: block;
        }
        .related-card .rc-body {
            padding: 18px 20px 20px;
        }
        .related-card .rc-cat {
            font-size: 12px;
            color: var(--primary);
            font-weight: 600;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            margin-bottom: 6px;
        }
        .related-card .rc-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: color var(--transition);
        }
        .related-card:hover .rc-title {
            color: var(--primary);
        }
        .related-card .rc-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 10px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .related-card .rc-meta i {
            margin-right: 4px;
            font-size: 12px;
        }

        /* ===== Error State ===== */
        .error-state {
            text-align: center;
            padding: 80px 24px;
            max-width: 500px;
            margin: 0 auto;
        }
        .error-state .err-icon {
            font-size: 56px;
            color: var(--text-muted);
            margin-bottom: 20px;
            opacity: 0.5;
        }
        .error-state h2 {
            font-size: 24px;
            margin-bottom: 12px;
        }
        .error-state p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .error-state .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            background: var(--primary);
            color: var(--text-inverse);
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition);
        }
        .error-state .btn-back:hover {
            background: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(240, 192, 64, 0.3);
            color: var(--text-inverse);
        }

        /* ===== Footer ===== */
        .app-footer {
            background: var(--bg-deep);
            border-top: 1px solid var(--border-light);
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .app-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid var(--border-light);
        }
        .app-footer .footer-brand .fb-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .app-footer .footer-brand .fb-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), #d4a030);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--text-inverse);
        }
        .app-footer .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 340px;
        }
        .app-footer .footer-links h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }
        .app-footer .footer-links a {
            display: block;
            font-size: 14px;
            color: var(--text-muted);
            padding: 4px 0;
            transition: color var(--transition);
        }
        .app-footer .footer-links a:hover {
            color: var(--primary);
        }
        .app-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 13px;
            color: var(--text-muted);
            flex-wrap: wrap;
            gap: 12px;
        }
        .app-footer .footer-bottom a {
            color: var(--text-muted);
        }
        .app-footer .footer-bottom a:hover {
            color: var(--primary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .app-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .article-banner {
                min-height: 320px;
                padding: 48px 0 32px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --nav-width: 0px;
            }
            .app-nav {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: 4px 0 40px rgba(0, 0, 0, 0.6);
            }
            .app-nav.open {
                transform: translateX(0);
            }
            .nav-toggle {
                display: flex;
            }
            .nav-overlay.show {
                display: block;
            }
            .main-wrap {
                margin-left: 0;
            }
            .article-banner {
                min-height: 280px;
                padding: 64px 0 28px;
            }
            .article-banner h1 {
                font-size: 24px;
            }
            .article-content {
                font-size: 16px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .app-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .app-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .article-meta {
                gap: 12px;
                font-size: 13px;
            }
            .article-share {
                flex-wrap: wrap;
            }
            .nav-links a.active::before {
                left: -8px;
                height: 20px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .article-banner {
                min-height: 240px;
                padding: 56px 0 24px;
            }
            .article-banner h1 {
                font-size: 20px;
            }
            .article-section {
                padding: 32px 0 40px;
            }
            .related-section {
                padding: 32px 0 40px;
            }
            .related-card .rc-img {
                height: 150px;
            }
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
            .error-state {
                padding: 48px 16px;
            }
            .error-state .err-icon {
                font-size: 40px;
            }
            .app-footer {
                padding: 32px 0 16px;
            }
            .nav-links a {
                padding: 10px 14px;
                font-size: 14px;
            }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #0b1a2e;
            --primary-light: #132a44;
            --primary-dark: #060f1a;
            --accent: #f0b830;
            --accent-light: #f5cd5a;
            --accent-dark: #c99a1a;
            --blue-sky: #4a8fe7;
            --blue-deep: #2a5f9e;
            --bg-body: #f4f7fc;
            --bg-card: #ffffff;
            --bg-dark: #0b1a2e;
            --text-primary: #1a2332;
            --text-secondary: #4a5568;
            --text-light: #a0aec0;
            --text-white: #f0f4fa;
            --border-color: #e2e8f0;
            --border-light: rgba(255, 255, 255, 0.12);
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.18);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --nav-width: 240px;
            --header-h: 0px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            display: flex;
            min-height: 100vh;
        }
        a {
            color: var(--blue-sky);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ===== App Layout ===== */
        .app-layout {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        /* ===== Left Nav ===== */
        .app-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--primary);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            border-right: 1px solid var(--border-light);
            transition: transform var(--transition);
        }
        .app-nav::-webkit-scrollbar {
            width: 4px;
        }
        .app-nav::-webkit-scrollbar-track {
            background: var(--primary-light);
        }
        .app-nav::-webkit-scrollbar-thumb {
            background: var(--accent-dark);
            border-radius: 4px;
        }
        .nav-header {
            padding: 28px 20px 20px;
            display: flex;
            align-items: center;
            gap: 12px;
            border-bottom: 1px solid var(--border-light);
        }
        .nav-logo {
            width: 44px;
            height: 44px;
            background: var(--accent);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--primary);
            flex-shrink: 0;
            box-shadow: 0 0 20px rgba(240, 184, 48, 0.2);
        }
        .nav-brand {
            font-size: 18px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-white);
            line-height: 1.2;
        }
        .nav-brand small {
            display: block;
            font-size: 12px;
            font-weight: 400;
            color: var(--text-light);
            letter-spacing: 1px;
            margin-top: 2px;
        }
        .nav-links {
            padding: 16px 12px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .nav-links a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-light);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
            text-decoration: none;
        }
        .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: var(--text-light);
            transition: color var(--transition);
        }
        .nav-links a:hover {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-white);
        }
        .nav-links a:hover i {
            color: var(--accent);
        }
        .nav-links a.active {
            background: rgba(240, 184, 48, 0.12);
            color: var(--accent);
            box-shadow: inset 3px 0 0 var(--accent);
        }
        .nav-links a.active i {
            color: var(--accent);
        }
        .nav-footer {
            padding: 16px 20px 24px;
            border-top: 1px solid var(--border-light);
        }
        .social-links {
            display: flex;
            gap: 16px;
            justify-content: center;
        }
        .social-links a {
            color: var(--text-light);
            font-size: 18px;
            transition: color var(--transition), transform var(--transition);
        }
        .social-links a:hover {
            color: var(--accent);
            transform: translateY(-2px);
        }

        /* ===== Mobile Nav Toggle ===== */
        .nav-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            width: 44px;
            height: 44px;
            background: var(--primary);
            color: var(--accent);
            border-radius: 12px;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            cursor: pointer;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-light);
        }
        .nav-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== Main Content Area ===== */
        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .main-content .container {
            padding: 0 32px;
        }

        /* ===== Hero / Banner ===== */
        .hero-section {
            position: relative;
            padding: 80px 32px 72px;
            background: var(--primary-dark);
            overflow: hidden;
            min-height: 340px;
            display: flex;
            align-items: center;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            z-index: 0;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(6, 15, 26, 0.85) 0%, rgba(11, 26, 46, 0.60) 100%);
            z-index: 1;
        }
        .hero-section .container {
            position: relative;
            z-index: 2;
            max-width: 1000px;
            margin: 0 auto;
            text-align: center;
        }
        .hero-section h1 {
            font-size: 48px;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: -0.5px;
            margin-bottom: 16px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }
        .hero-section h1 i {
            color: var(--accent);
            margin-right: 10px;
        }
        .hero-section .hero-sub {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 700px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 15px;
            font-weight: 600;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary);
            box-shadow: 0 4px 16px rgba(240, 184, 48, 0.30);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(240, 184, 48, 0.40);
            color: var(--primary);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border: 2px solid rgba(255, 255, 255, 0.25);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 13px;
        }

        /* ===== Section Shared ===== */
        .section {
            padding: 72px 0;
        }
        .section-alt {
            background: var(--bg-card);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-dark .section-title {
            color: var(--text-white);
        }
        .section-sub {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 640px;
            margin-bottom: 44px;
            line-height: 1.7;
        }
        .section-dark .section-sub {
            color: rgba(255, 255, 255, 0.6);
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .section-sub {
            margin: 0 auto 0;
        }

        /* ===== Cards Grid ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border-color);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: var(--border-color);
        }
        .card-body {
            padding: 24px;
        }
        .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .card-body .card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(74, 143, 231, 0.08);
            color: var(--blue-sky);
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 10px;
        }
        .card-footer-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--blue-sky);
            transition: color var(--transition);
        }
        .card-footer-link:hover {
            color: var(--accent);
        }
        .card-footer-link i {
            font-size: 12px;
            transition: transform var(--transition);
        }
        .card-footer-link:hover i {
            transform: translateX(4px);
        }

        /* ===== Badge ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .badge-accent {
            background: var(--accent);
            color: var(--primary);
        }
        .badge-blue {
            background: rgba(74, 143, 231, 0.12);
            color: var(--blue-sky);
        }
        .badge-soft {
            background: rgba(255, 255, 255, 0.10);
            color: var(--text-light);
        }

        /* ===== Guide Feature Block ===== */
        .feature-block {
            display: flex;
            gap: 48px;
            align-items: center;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 0;
            overflow: hidden;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
        }
        .feature-block.reverse {
            flex-direction: row-reverse;
        }
        .feature-block .fb-image {
            flex: 0 0 48%;
            min-height: 320px;
            background: var(--border-color);
        }
        .feature-block .fb-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .feature-block .fb-content {
            flex: 1;
            padding: 40px 40px 40px 0;
        }
        .feature-block.reverse .fb-content {
            padding: 40px 0 40px 40px;
        }
        .feature-block .fb-content h3 {
            font-size: 26px;
            font-weight: 800;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .feature-block .fb-content p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .feature-block .fb-content .btn {
            margin-top: 8px;
        }

        /* ===== Stats / Data Row ===== */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            text-align: center;
        }
        .stat-item {
            padding: 32px 16px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            transition: background var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .stat-item .stat-num {
            font-size: 40px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.1;
            margin-bottom: 6px;
        }
        .stat-item .stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            letter-spacing: 0.5px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            border: none;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: rgba(0, 0, 0, 0.02);
        }
        .faq-question i {
            font-size: 14px;
            color: var(--text-light);
            transition: transform var(--transition);
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
            padding: 72px 32px;
        }
        .cta-section h2 {
            font-size: 36px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 600px;
            margin: 0 auto 32px;
            line-height: 1.8;
        }

        /* ===== Content List ===== */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .content-item {
            display: flex;
            gap: 20px;
            align-items: flex-start;
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .content-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }
        .content-item .ci-index {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            background: rgba(74, 143, 231, 0.08);
            color: var(--blue-sky);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 700;
        }
        .content-item .ci-body {
            flex: 1;
        }
        .content-item .ci-body h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 4px;
        }
        .content-item .ci-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .content-item .ci-meta {
            flex-shrink: 0;
            font-size: 13px;
            color: var(--text-light);
            white-space: nowrap;
            padding-top: 4px;
        }

        /* ===== Equipment Cards ===== */
        .equip-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .equip-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            text-align: center;
        }
        .equip-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .equip-card .equip-icon {
            font-size: 40px;
            color: var(--accent);
            margin-bottom: 16px;
        }
        .equip-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .equip-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .equip-card .equip-tag {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(240, 184, 48, 0.10);
            color: var(--accent-dark);
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
        }

        /* ===== Footer ===== */
        .app-footer {
            background: var(--primary-dark);
            color: var(--text-white);
            padding: 56px 0 0;
            margin-top: auto;
        }
        .app-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid var(--border-light);
        }
        .app-footer .footer-brand .fb-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-white);
        }
        .app-footer .footer-brand .fb-icon {
            width: 38px;
            height: 38px;
            background: var(--accent);
            color: var(--primary);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
        }
        .app-footer .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.8;
            max-width: 320px;
        }
        .app-footer .footer-links h4 {
            font-size: 14px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--text-light);
            margin-bottom: 16px;
        }
        .app-footer .footer-links a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            padding: 4px 0;
            transition: color var(--transition);
        }
        .app-footer .footer-links a:hover {
            color: var(--accent);
        }
        .app-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.35);
        }
        .app-footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.35);
        }
        .app-footer .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== Back to Top ===== */
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            background: var(--primary);
            color: var(--accent);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: var(--shadow-lg);
            z-index: 500;
            opacity: 0;
            visibility: hidden;
            transition: all var(--transition);
            border: 1px solid var(--border-light);
        }
        .back-top.visible {
            opacity: 1;
            visibility: visible;
        }
        .back-top:hover {
            background: var(--primary-light);
            color: var(--accent-light);
            transform: translateY(-3px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .app-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .feature-block,
            .feature-block.reverse {
                flex-direction: column;
            }
            .feature-block .fb-image {
                flex: 0 0 240px;
                width: 100%;
                min-height: 240px;
            }
            .feature-block .fb-content {
                padding: 32px !important;
            }
            .hero-section h1 {
                font-size: 36px;
            }
        }

        @media (max-width: 768px) {
            body {
                flex-direction: column;
            }
            .app-nav {
                transform: translateX(-100%);
                width: 280px;
            }
            .app-nav.open {
                transform: translateX(0);
            }
            .nav-toggle {
                display: flex;
            }
            .nav-overlay.open {
                display: block;
            }
            .main-content {
                margin-left: 0;
            }
            .main-content .container {
                padding: 0 20px;
            }
            .hero-section {
                padding: 60px 20px 56px;
                min-height: 280px;
            }
            .hero-section h1 {
                font-size: 30px;
            }
            .hero-section .hero-sub {
                font-size: 16px;
            }
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 26px;
            }
            .grid-3,
            .grid-2,
            .equip-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .stat-item .stat-num {
                font-size: 32px;
            }
            .app-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .app-footer .footer-bottom {
                flex-direction: column;
                gap: 8px;
                text-align: center;
            }
            .feature-block .fb-image {
                min-height: 200px;
            }
            .feature-block .fb-content {
                padding: 24px !important;
            }
            .feature-block .fb-content h3 {
                font-size: 22px;
            }
            .cta-section h2 {
                font-size: 28px;
            }
            .content-item {
                flex-direction: column;
                gap: 12px;
                padding: 16px 18px;
            }
            .content-item .ci-meta {
                white-space: normal;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-actions .btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
            .equip-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 520px) {
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
            }
            .equip-grid {
                grid-template-columns: 1fr;
            }
            .hero-section h1 {
                font-size: 26px;
            }
            .hero-section .hero-sub {
                font-size: 15px;
            }
            .section-title {
                font-size: 22px;
            }
            .nav-toggle {
                top: 12px;
                left: 12px;
                width: 40px;
                height: 40px;
                font-size: 18px;
            }
            .back-top {
                bottom: 20px;
                right: 20px;
                width: 42px;
                height: 42px;
                font-size: 17px;
            }
        }

        /* ===== Focus / Accessibility ===== */
        a:focus-visible,
        button:focus-visible,
        .btn:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .gap-12 {
            gap: 12px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }