/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2A3FCC;
            --primary-light: #4B63E6;
            --primary-dark: #1D2E99;
            --accent: #F06A3E;
            --accent-light: #F58B66;
            --bg-body: #F5F7FC;
            --bg-white: #FFFFFF;
            --bg-card: #FFFFFF;
            --bg-dark: #1A1F36;
            --text-primary: #1A1F36;
            --text-secondary: #4A5568;
            --text-weak: #8896AB;
            --text-white: #FFFFFF;
            --border: #E2E8F0;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(26, 31, 54, 0.06);
            --shadow-md: 0 6px 24px rgba(26, 31, 54, 0.10);
            --shadow-lg: 0 16px 48px rgba(26, 31, 54, 0.14);
            --shadow-xl: 0 24px 64px rgba(26, 31, 54, 0.18);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --nav-height: 72px;
        }

        /* ===== 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);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.6;
            font-size: 16px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-light);
        }
        a:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
            border-radius: 4px;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--text-primary);
        }
        h1 {
            font-size: clamp(2.2rem, 5vw, 3.6rem);
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: clamp(1.2rem, 2.2vw, 1.6rem);
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            font-weight: 600;
            font-size: 0.95rem;
            border-radius: var(--radius-md);
            transition: all var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 14px rgba(42, 63, 204, 0.30);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            box-shadow: 0 8px 28px rgba(42, 63, 204, 0.40);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(42, 63, 204, 0.25);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
            box-shadow: 0 4px 14px rgba(240, 106, 62, 0.30);
        }
        .btn-accent:hover {
            background: #D95A2E;
            border-color: #D95A2E;
            box-shadow: 0 8px 28px rgba(240, 106, 62, 0.40);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-accent:active {
            transform: translateY(0);
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.05rem;
            border-radius: var(--radius-lg);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
            border-radius: var(--radius-sm);
        }

        /* ===== 导航 (浮动Dock) ===== */
        .site-header {
            position: fixed;
            top: 16px;
            left: 0;
            right: 0;
            z-index: 1000;
            pointer-events: none;
            padding: 0 20px;
        }
        .nav-dock {
            pointer-events: auto;
            max-width: 900px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(18px) saturate(1.4);
            -webkit-backdrop-filter: blur(18px) saturate(1.4);
            border-radius: var(--radius-xl);
            box-shadow: 0 8px 32px rgba(26, 31, 54, 0.10), 0 0 0 1px rgba(255, 255, 255, 0.6);
            padding: 0 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 60px;
            transition: box-shadow var(--transition);
        }
        .nav-dock:hover {
            box-shadow: 0 12px 40px rgba(26, 31, 54, 0.14), 0 0 0 1px rgba(255, 255, 255, 0.8);
        }
        .nav-logo {
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.03em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }
        .nav-logo .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-links a {
            padding: 8px 18px;
            border-radius: var(--radius-md);
            font-weight: 500;
            font-size: 0.9rem;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: rgba(42, 63, 204, 0.06);
        }
        .nav-links a.active {
            color: var(--primary);
            background: rgba(42, 63, 204, 0.10);
            font-weight: 600;
        }
        .nav-cta {
            flex-shrink: 0;
        }
        .nav-cta .btn {
            padding: 8px 20px;
            font-size: 0.85rem;
            border-radius: var(--radius-md);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: none;
            border: none;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: all var(--transition);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Hero 首屏 ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center center;
            background-repeat: no-repeat;
            overflow: hidden;
            padding: 120px 20px 80px;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26, 31, 54, 0.78) 0%, rgba(26, 31, 54, 0.44) 100%);
            z-index: 1;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 200px;
            background: linear-gradient(to top, var(--bg-body), transparent);
            z-index: 2;
            pointer-events: none;
        }
        .hero-content {
            position: relative;
            z-index: 3;
            text-align: center;
            max-width: 800px;
            color: #fff;
        }
        .hero-content h1 {
            color: #fff;
            font-size: clamp(2.4rem, 5.5vw, 4rem);
            margin-bottom: 20px;
            text-shadow: 0 4px 20px rgba(0, 0, 0, 0.20);
        }
        .hero-content .hero-sub {
            font-size: clamp(1rem, 2vw, 1.25rem);
            color: rgba(255, 255, 255, 0.80);
            margin-bottom: 32px;
            line-height: 1.7;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .hero-actions .btn {
            font-size: 1rem;
            padding: 14px 32px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.18);
            border-radius: 100px;
            padding: 8px 20px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.90);
            margin-bottom: 28px;
        }
        .hero-badge i {
            font-style: normal;
            background: var(--accent);
            border-radius: 50px;
            padding: 2px 12px;
            font-weight: 600;
            font-size: 0.75rem;
            color: #fff;
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 56px;
        }
        .section-header h2 {
            margin-bottom: 12px;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-weak);
        }
        .section-header .tag {
            display: inline-block;
            background: rgba(42, 63, 204, 0.08);
            color: var(--primary);
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            margin-bottom: 16px;
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            padding: 28px 24px;
            transition: all var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: rgba(42, 63, 204, 0.12);
        }
        .card-img {
            border-radius: var(--radius-md);
            overflow: hidden;
            margin: -28px -24px 20px -24px;
        }
        .card-img img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .card:hover .card-img img {
            transform: scale(1.05);
        }
        .card h3 {
            margin-bottom: 8px;
        }
        .card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
        }
        .card .badge {
            display: inline-block;
            background: rgba(42, 63, 204, 0.08);
            color: var(--primary);
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        /* ===== 网格 ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 24px;
        }

        /* ===== 核心优势 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: rgba(42, 63, 204, 0.10);
        }
        .feature-icon {
            width: 60px;
            height: 60px;
            background: rgba(42, 63, 204, 0.08);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-size: 1.6rem;
            color: var(--primary);
            transition: background var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: var(--primary);
            color: #fff;
        }
        .feature-card h3 {
            margin-bottom: 6px;
            font-size: 1.15rem;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-weak);
        }

        /* ===== 功能分类入口 ===== */
        .category-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 28px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .category-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: rgba(42, 63, 204, 0.12);
        }
        .category-card .cc-img {
            height: 200px;
            overflow: hidden;
        }
        .category-card .cc-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .category-card:hover .cc-img img {
            transform: scale(1.05);
        }
        .category-card .cc-body {
            padding: 22px 24px 26px;
        }
        .category-card .cc-body h3 {
            font-size: 1.1rem;
            margin-bottom: 6px;
        }
        .category-card .cc-body p {
            font-size: 0.9rem;
            color: var(--text-weak);
            margin-bottom: 14px;
        }
        .category-card .cc-body .btn {
            padding: 8px 18px;
            font-size: 0.8rem;
        }

        /* ===== 使用流程 ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            position: relative;
            transition: all var(--transition);
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 12px rgba(42, 63, 204, 0.30);
        }
        .step-item .step-icon {
            font-size: 2rem;
            margin-bottom: 12px;
            margin-top: 8px;
            color: var(--primary);
        }
        .step-item h3 {
            font-size: 1.05rem;
            margin-bottom: 4px;
        }
        .step-item p {
            font-size: 0.85rem;
            color: var(--text-weak);
        }

        /* ===== 最新资讯列表 (CMS) ===== */
        .post-list {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .post-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 22px 26px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            display: flex;
            align-items: flex-start;
            gap: 20px;
            transition: all var(--transition);
        }
        .post-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: rgba(42, 63, 204, 0.10);
        }
        .post-item .post-thumb {
            width: 100px;
            height: 80px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--border);
        }
        .post-item .post-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .post-item .post-info {
            flex: 1;
            min-width: 0;
        }
        .post-item .post-info h4 {
            font-size: 1rem;
            margin-bottom: 4px;
            font-weight: 600;
        }
        .post-item .post-info h4 a {
            color: var(--text-primary);
        }
        .post-item .post-info h4 a:hover {
            color: var(--primary);
        }
        .post-item .post-info .post-meta {
            display: flex;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-weak);
            margin-top: 6px;
        }
        .post-item .post-info .post-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .post-item .post-info .post-excerpt {
            font-size: 0.88rem;
            color: var(--text-secondary);
            margin-top: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .empty-msg {
            text-align: center;
            padding: 48px 20px;
            color: var(--text-weak);
            font-size: 1rem;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--border);
        }

        /* ===== 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-md);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            transition: background var(--transition);
            user-select: none;
            gap: 12px;
        }
        .faq-question:hover {
            background: rgba(42, 63, 204, 0.03);
        }
        .faq-question .faq-icon {
            font-size: 1.2rem;
            color: var(--text-weak);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
            padding: 100px 0;
            text-align: center;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(26, 31, 54, 0.72);
            z-index: 1;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.70);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.70);
            padding: 48px 0 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 32px;
        }
        .footer-brand {
            flex: 1 1 280px;
        }
        .footer-brand .footer-logo {
            font-size: 1.2rem;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 10px;
        }
        .footer-brand .footer-logo .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
        }
        .footer-brand p {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.55);
            max-width: 300px;
            line-height: 1.6;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }
        .footer-links .col {
            min-width: 120px;
        }
        .footer-links .col h4 {
            color: #fff;
            font-size: 0.9rem;
            margin-bottom: 12px;
            font-weight: 600;
        }
        .footer-links .col a {
            display: block;
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.85rem;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-links .col a:hover {
            color: #fff;
        }
        .footer-bottom {
            margin-top: 32px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            text-align: center;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.40);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.50);
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== 分隔线 ===== */
        .divider {
            width: 60px;
            height: 4px;
            background: var(--primary);
            border-radius: 4px;
            margin: 16px auto 0;
        }
        .divider.left {
            margin: 16px 0 0;
        }

        /* ===== 统计数字 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 20px;
            text-align: center;
        }
        .stat-item {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 16px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .stat-item .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: 0.85rem;
            color: var(--text-weak);
            margin-top: 4px;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .section {
                padding: 60px 0;
            }
        }
        @media (max-width: 768px) {
            .site-header {
                top: 12px;
                padding: 0 12px;
            }
            .nav-dock {
                padding: 0 14px;
                height: 54px;
                border-radius: var(--radius-lg);
            }
            .nav-links {
                display: none;
                position: absolute;
                top: calc(100% + 10px);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.96);
                backdrop-filter: blur(18px);
                border-radius: var(--radius-lg);
                box-shadow: var(--shadow-lg);
                padding: 12px 8px;
                flex-direction: column;
                gap: 2px;
                border: 1px solid var(--border);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                padding: 12px 18px;
                width: 100%;
                font-size: 0.95rem;
            }
            .nav-toggle {
                display: flex;
            }
            .hero {
                min-height: 92vh;
                padding: 100px 16px 60px;
            }
            .hero-content h1 {
                font-size: clamp(1.8rem, 6vw, 2.6rem);
            }
            .hero-actions .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
            .section {
                padding: 48px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .features-grid,
            .category-cards {
                grid-template-columns: 1fr;
            }
            .steps {
                grid-template-columns: 1fr 1fr;
            }
            .post-item {
                flex-direction: column;
                padding: 18px;
            }
            .post-item .post-thumb {
                width: 100%;
                height: 160px;
            }
            .cta-section {
                padding: 64px 0;
            }
            .footer-inner {
                flex-direction: column;
                gap: 24px;
            }
            .footer-links {
                gap: 24px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 520px) {
            .nav-dock {
                padding: 0 12px;
                height: 50px;
            }
            .nav-logo {
                font-size: 1rem;
            }
            .nav-logo .logo-icon {
                width: 28px;
                height: 28px;
                font-size: 0.85rem;
            }
            .nav-cta .btn {
                padding: 6px 14px;
                font-size: 0.75rem;
            }
            .hero {
                min-height: 86vh;
                padding: 80px 12px 40px;
            }
            .steps {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .hero-badge {
                font-size: 0.75rem;
                padding: 6px 14px;
            }
            .section {
                padding: 36px 0;
            }
            .card {
                padding: 20px 18px;
            }
            .card-img {
                margin: -20px -18px 16px -18px;
            }
            .card-img img {
                height: 160px;
            }
            .feature-card {
                padding: 24px 18px;
            }
            .category-card .cc-img {
                height: 160px;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.9rem;
            }
            .faq-answer {
                font-size: 0.85rem;
            }
            .footer-links .col {
                min-width: 100px;
            }
        }

        /* ===== 滚动条美化 ===== */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-body);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-weak);
        }

        /* ===== 选中颜色 ===== */
        ::selection {
            background: rgba(42, 63, 204, 0.18);
            color: var(--text-primary);
        }

        /* ===== 过渡动画 ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
            --secondary: #f59e0b;
            --secondary-light: #fef3c7;
            --accent: #10b981;
            --bg-base: #f8fafc;
            --bg-white: #ffffff;
            --bg-soft: #f1f5f9;
            --bg-dark: #0f172a;
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-inverse: #f8fafc;
            --border: #e2e8f0;
            --border-focus: #2563eb;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.14);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --nav-height: 68px;
            --max-width: 1200px;
            --gap: 24px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-primary);
            background: var(--bg-base);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--nav-height);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        button { font: inherit; cursor: pointer; border: none; background: none; }
        input, textarea { font: inherit; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 16px; outline: none; transition: border-color var(--transition), box-shadow var(--transition); width: 100%; background: var(--bg-white); }
        input:focus, textarea:focus { border-color: var(--border-focus); box-shadow: 0 0 0 3px rgba(37,99,235,0.15); }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text-primary); }
        h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
        h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); }
        h3 { font-size: 1.25rem; }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1em; color: var(--text-secondary); }
        .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--gap); }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .text-muted { color: var(--text-muted); }
        .mt-1 { margin-top: 8px; }
        .mt-2 { margin-top: 16px; }
        .mt-3 { margin-top: 24px; }
        .mt-4 { margin-top: 40px; }
        .mb-1 { margin-bottom: 8px; }
        .mb-2 { margin-bottom: 16px; }
        .mb-3 { margin-bottom: 24px; }
        .mb-4 { margin-bottom: 40px; }
        .section-padding { padding: 70px 0; }
        .section-title { text-align: center; margin-bottom: 48px; }
        .section-title h2 { margin-bottom: 12px; }
        .section-title p { max-width: 640px; margin: 0 auto; color: var(--text-muted); font-size: 1.05rem; }
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: var(--primary-light);
            color: var(--primary);
            margin-bottom: 12px;
        }
        .badge-accent { background: #d1fae5; color: #047857; }
        .badge-warm { background: var(--secondary-light); color: #b45309; }
        .divider { width: 60px; height: 4px; border-radius: 4px; background: var(--primary-gradient); margin: 16px auto 20px; }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex; align-items: center; justify-content: center; gap: 8px;
            padding: 12px 28px; border-radius: 100px; font-weight: 600; font-size: 0.95rem;
            transition: all var(--transition); border: none; cursor: pointer;
            line-height: 1.2; white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary-gradient); color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,0.35);
        }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.45); color: #fff; }
        .btn-primary:active { transform: translateY(0); box-shadow: 0 2px 8px rgba(37,99,235,0.3); }
        .btn-outline {
            background: transparent; color: var(--primary); border: 2px solid var(--primary);
        }
        .btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
        .btn-outline:active { transform: translateY(0); }
        .btn-white {
            background: #fff; color: var(--primary); box-shadow: var(--shadow-md);
        }
        .btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); color: var(--primary-dark); }
        .btn-sm { padding: 8px 20px; font-size: 0.85rem; }
        .btn-lg { padding: 16px 36px; font-size: 1.05rem; }
        .btn i { font-size: 0.9em; }

        /* ===== Header / Dock Nav ===== */
        .site-header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            height: var(--nav-height);
            background: rgba(255,255,255,0.80);
            backdrop-filter: blur(18px) saturate(1.6);
            -webkit-backdrop-filter: blur(18px) saturate(1.6);
            border-bottom: 1px solid rgba(226,232,240,0.6);
            transition: background var(--transition);
        }
        .nav-dock {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--gap);
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-primary);
            text-decoration: none;
            flex-shrink: 0;
        }
        .nav-logo:hover { color: var(--primary); }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px; height: 36px;
            border-radius: 10px;
            background: var(--primary-gradient);
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            box-shadow: 0 4px 12px rgba(37,99,235,0.3);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            justify-content: center;
        }
        .nav-links a {
            padding: 8px 18px;
            border-radius: 100px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover { background: var(--bg-soft); color: var(--text-primary); }
        .nav-links a.active {
            background: var(--primary-gradient);
            color: #fff;
            box-shadow: 0 4px 12px rgba(37,99,235,0.25);
        }
        .nav-cta { flex-shrink: 0; }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            background: transparent;
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: var(--bg-soft); }
        .nav-toggle span {
            display: block;
            width: 24px; height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: all var(--transition);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
        .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        /* ===== Hero / Banner ===== */
        .page-banner {
            position: relative;
            padding: 90px 0 70px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            color: var(--text-inverse);
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.88) 0%, rgba(30,41,59,0.70) 100%);
            z-index: 1;
        }
        .page-banner .container { position: relative; z-index: 2; }
        .page-banner h1 {
            color: #fff;
            font-weight: 800;
            margin-bottom: 16px;
            text-shadow: 0 2px 20px rgba(0,0,0,0.3);
        }
        .page-banner p {
            color: rgba(255,255,255,0.80);
            font-size: 1.15rem;
            max-width: 640px;
            margin-bottom: 28px;
            text-shadow: 0 1px 8px rgba(0,0,0,0.2);
        }
        .banner-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .banner-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: rgba(255,255,255,0.70);
            font-size: 0.9rem;
        }
        .banner-meta i { color: var(--secondary); }

        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
        }
        .step-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px; height: 48px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #fff;
            font-weight: 800;
            font-size: 1.2rem;
            margin-bottom: 16px;
            box-shadow: 0 4px 14px rgba(37,99,235,0.25);
        }
        .step-card h3 { margin-bottom: 8px; font-size: 1.1rem; }
        .step-card p { font-size: 0.92rem; color: var(--text-muted); margin-bottom: 0; }
        .step-arrow {
            display: none;
            position: absolute;
            right: -20px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 1.4rem;
        }
        .steps-grid .step-card:not(:last-child) .step-arrow { display: block; }

        /* ===== Features ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .feature-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px; height: 52px;
            border-radius: 16px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 1.5rem;
            margin-bottom: 16px;
        }
        .feature-card h3 { margin-bottom: 8px; font-size: 1.1rem; }
        .feature-card p { font-size: 0.92rem; color: var(--text-muted); margin-bottom: 0; }

        /* ===== Tips / Highlights ===== */
        .tips-section {
            background: var(--bg-white);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--gap);
        }
        .tip-item {
            display: flex;
            gap: 16px;
            padding: 20px;
            border-radius: var(--radius-sm);
            background: var(--bg-soft);
            transition: background var(--transition);
        }
        .tip-item:hover { background: var(--primary-light); }
        .tip-icon {
            flex-shrink: 0;
            width: 40px; height: 40px;
            border-radius: 12px;
            background: var(--primary-gradient);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
        }
        .tip-content h4 { font-size: 1rem; margin-bottom: 4px; }
        .tip-content p { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 0; }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            background: transparent;
            transition: background var(--transition);
            text-align: left;
        }
        .faq-question:hover { background: var(--bg-soft); }
        .faq-question i { color: var(--primary); transition: transform var(--transition); font-size: 0.9rem; }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            color: #fff;
            text-align: center;
            padding: 80px 0;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(30,41,59,0.65) 100%);
            z-index: 0;
        }
        .cta-block .container { position: relative; z-index: 1; }
        .cta-block h2 { color: #fff; margin-bottom: 16px; }
        .cta-block p { color: rgba(255,255,255,0.80); max-width: 560px; margin: 0 auto 32px; font-size: 1.05rem; }
        .cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.70);
            padding: 56px 0 32px;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 1.4fr 2fr;
            gap: 48px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.2rem;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand p { font-size: 0.92rem; color: rgba(255,255,255,0.55); max-width: 320px; }
        .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .footer-links .col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 16px; }
        .footer-links .col a {
            display: block;
            color: rgba(255,255,255,0.55);
            font-size: 0.88rem;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-links .col a:hover { color: #fff; }
        .footer-bottom {
            text-align: center;
            padding-top: 24px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.40);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .step-arrow { display: none !important; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
        }

        @media (max-width: 768px) {
            .nav-links {
                position: fixed;
                top: var(--nav-height);
                left: 0; right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(18px);
                -webkit-backdrop-filter: blur(18px);
                flex-direction: column;
                padding: 16px var(--gap);
                gap: 4px;
                border-bottom: 1px solid var(--border);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                pointer-events: none;
                box-shadow: var(--shadow-lg);
            }
            .nav-links.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-links a { width: 100%; text-align: center; padding: 12px; font-size: 1rem; }
            .nav-toggle { display: flex; }
            .nav-cta { display: none; }
            .page-banner { padding: 60px 0 50px; }
            .page-banner h1 { font-size: 1.8rem; }
            .page-banner p { font-size: 1rem; }

            .footer-inner { grid-template-columns: 1fr; gap: 32px; }
            .footer-links { grid-template-columns: repeat(2, 1fr); }
            .tips-grid { grid-template-columns: 1fr; }
            .features-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr; }
            .cta-block { padding: 60px 0; }
            .section-padding { padding: 48px 0; }
            .section-title { margin-bottom: 32px; }
        }

        @media (max-width: 520px) {
            .nav-logo span:not(.logo-icon) { font-size: 0.95rem; }
            .page-banner h1 { font-size: 1.5rem; }
            .footer-links { grid-template-columns: 1fr; }
            .cta-buttons .btn { width: 100%; }
        }

        /* ===== Accessibility ===== */
        :focus-visible { outline: 3px solid var(--border-focus); outline-offset: 2px; border-radius: 4px; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

        /* ===== Additional ===== */
        .cover-image {
            border-radius: var(--radius-sm);
            object-fit: cover;
            width: 100%;
            height: 200px;
        }
        .cover-image-card {
            border-radius: var(--radius-md);
            overflow: hidden;
            margin-bottom: 16px;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
    :root {
        --primary: #2563eb;
        --primary-dark: #1d4ed8;
        --primary-light: #3b82f6;
        --primary-bg: #eff6ff;
        --secondary: #0f172a;
        --secondary-light: #1e293b;
        --accent: #f59e0b;
        --accent-dark: #d97706;
        --body-bg: #f8fafc;
        --card-bg: #ffffff;
        --text-primary: #0f172a;
        --text-secondary: #475569;
        --text-muted: #94a3b8;
        --border: #e2e8f0;
        --border-light: #f1f5f9;
        --radius: 12px;
        --radius-sm: 8px;
        --radius-lg: 16px;
        --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
        --shadow: 0 4px 12px rgba(0,0,0,0.06);
        --shadow-lg: 0 12px 32px rgba(0,0,0,0.08);
        --shadow-xl: 0 20px 48px rgba(0,0,0,0.12);
        --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
        --container: 1200px;
        --nav-height: 72px;
    }

    /* ===== Reset / Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
    body {
        font-family: var(--font-sans);
        font-size: 16px;
        line-height: 1.6;
        color: var(--text-primary);
        background: var(--body-bg);
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
    a:hover { color: var(--primary-dark); }
    img { max-width: 100%; height: auto; display: block; }
    button, input, textarea { font-family: inherit; font-size: inherit; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text-primary); }
    .container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

    /* ===== 导航 Dock ===== */
    .site-header {
        position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
        padding: 12px 24px;
        background: transparent;
        pointer-events: none;
    }
    .nav-dock {
        max-width: 900px; margin: 0 auto;
        display: flex; align-items: center; gap: 12px;
        background: rgba(255,255,255,0.88);
        backdrop-filter: blur(16px) saturate(1.2);
        -webkit-backdrop-filter: blur(16px) saturate(1.2);
        border-radius: 60px;
        padding: 8px 20px 8px 24px;
        box-shadow: 0 4px 24px rgba(0,0,0,0.06), 0 0 0 1px rgba(255,255,255,0.6);
        pointer-events: auto;
        transition: box-shadow var(--transition);
    }
    .nav-dock:hover { box-shadow: 0 8px 32px rgba(0,0,0,0.10), 0 0 0 1px rgba(255,255,255,0.8); }
    .nav-logo {
        display: flex; align-items: center; gap: 8px;
        font-weight: 700; font-size: 18px; color: var(--text-primary);
        text-decoration: none; letter-spacing: -0.3px;
        flex-shrink: 0;
    }
    .nav-logo:hover { color: var(--primary); }
    .logo-icon {
        display: inline-flex; align-items: center; justify-content: center;
        width: 34px; height: 34px; border-radius: 50%;
        background: var(--primary); color: #fff;
        font-weight: 800; font-size: 18px; letter-spacing: 0;
        flex-shrink: 0;
    }
    .nav-links {
        display: flex; align-items: center; gap: 4px;
        margin: 0 auto; flex: 1; justify-content: center;
    }
    .nav-links a {
        display: inline-flex; align-items: center; gap: 4px;
        padding: 6px 16px; border-radius: 40px;
        font-size: 14px; font-weight: 500; color: var(--text-secondary);
        text-decoration: none; transition: all var(--transition);
        white-space: nowrap;
    }
    .nav-links a:hover { color: var(--text-primary); background: var(--border-light); }
    .nav-links a.active {
        color: #fff; background: var(--primary);
        box-shadow: 0 2px 8px rgba(37,99,235,0.25);
    }
    .nav-links a.active:hover { background: var(--primary-dark); }
    .nav-cta { flex-shrink: 0; }
    .nav-toggle { display: none; }

    /* ===== 按钮 ===== */
    .btn {
        display: inline-flex; align-items: center; justify-content: center; gap: 8px;
        padding: 10px 28px; border-radius: 40px;
        font-size: 14px; font-weight: 600; line-height: 1.2;
        border: none; cursor: pointer; transition: all var(--transition);
        text-decoration: none; white-space: nowrap;
    }
    .btn-primary { background: var(--primary); color: #fff; box-shadow: 0 2px 8px rgba(37,99,235,0.25); }
    .btn-primary:hover { background: var(--primary-dark); color: #fff; box-shadow: 0 4px 16px rgba(37,99,235,0.35); transform: translateY(-1px); }
    .btn-primary:active { transform: translateY(0); box-shadow: 0 1px 4px rgba(37,99,235,0.2); }
    .btn-outline { background: transparent; color: var(--text-primary); border: 1.5px solid var(--border); }
    .btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-bg); transform: translateY(-1px); }
    .btn-sm { padding: 6px 18px; font-size: 13px; }
    .btn-lg { padding: 14px 36px; font-size: 16px; border-radius: 48px; }
    .btn-block { width: 100%; }

    /* ===== 徽章 / 标签 ===== */
    .badge {
        display: inline-flex; align-items: center; gap: 4px;
        padding: 4px 14px; border-radius: 40px;
        font-size: 12px; font-weight: 600; line-height: 1.2;
        background: var(--primary-bg); color: var(--primary);
        border: 1px solid rgba(37,99,235,0.15);
    }
    .badge-accent { background: #fffbeb; color: var(--accent-dark); border-color: rgba(245,158,11,0.2); }
    .badge-muted { background: var(--border-light); color: var(--text-muted); border-color: transparent; }

    /* ===== 文章 Banner ===== */
    .article-banner {
        position: relative; padding: 140px 0 60px; margin-top: 0;
        background: var(--secondary) url('/assets/images/backpic/back-2.png') center/cover no-repeat;
        background-blend-mode: overlay;
        min-height: 320px; display: flex; align-items: flex-end;
    }
    .article-banner::before {
        content: ''; position: absolute; inset: 0;
        background: linear-gradient(180deg, rgba(15,23,42,0.50) 0%, rgba(15,23,42,0.80) 100%);
    }
    .article-banner .container { position: relative; z-index: 1; width: 100%; }
    .breadcrumb {
        display: flex; align-items: center; gap: 8px;
        font-size: 13px; color: rgba(255,255,255,0.65); margin-bottom: 16px; flex-wrap: wrap;
    }
    .breadcrumb a { color: rgba(255,255,255,0.75); text-decoration: none; transition: color var(--transition); }
    .breadcrumb a:hover { color: #fff; }
    .breadcrumb span { color: rgba(255,255,255,0.45); }
    .article-banner h1 {
        font-size: 36px; font-weight: 800; color: #fff;
        max-width: 800px; margin-bottom: 12px; line-height: 1.2;
        letter-spacing: -0.5px;
    }
    .article-meta-bar {
        display: flex; flex-wrap: wrap; align-items: center; gap: 16px 24px;
        color: rgba(255,255,255,0.75); font-size: 14px; margin-top: 4px;
    }
    .article-meta-bar .badge { background: rgba(255,255,255,0.15); color: #fff; border-color: rgba(255,255,255,0.2); }
    .article-meta-bar .meta-item { display: flex; align-items: center; gap: 6px; }
    .article-meta-bar .meta-item i { font-size: 14px; opacity: 0.7; }

    /* ===== 文章正文 ===== */
    .article-body-section {
        padding: 48px 0 32px; background: var(--body-bg);
    }
    .article-layout {
        display: grid; grid-template-columns: 1fr 280px; gap: 48px;
        max-width: var(--container); margin: 0 auto; padding: 0 24px;
    }
    .article-main { min-width: 0; }
    .article-content {
        background: var(--card-bg); border-radius: var(--radius-lg);
        padding: 40px 48px; box-shadow: var(--shadow);
        border: 1px solid var(--border);
    }
    .article-content h2 { font-size: 26px; margin: 36px 0 16px; color: var(--text-primary); }
    .article-content h3 { font-size: 20px; margin: 28px 0 12px; color: var(--text-primary); }
    .article-content p { margin: 0 0 20px; color: var(--text-secondary); font-size: 16px; line-height: 1.8; }
    .article-content ul, .article-content ol { margin: 0 0 20px; padding-left: 24px; }
    .article-content ul { list-style: disc; }
    .article-content ol { list-style: decimal; }
    .article-content li { margin-bottom: 6px; color: var(--text-secondary); line-height: 1.7; }
    .article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
    .article-content a:hover { color: var(--primary-dark); }
    .article-content blockquote {
        margin: 24px 0; padding: 20px 28px; border-left: 4px solid var(--primary);
        background: var(--primary-bg); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        font-style: normal; color: var(--text-secondary); font-size: 15px;
    }
    .article-content blockquote p:last-child { margin-bottom: 0; }
    .article-content img { border-radius: var(--radius-sm); margin: 24px 0; width: 100%; object-fit: cover; }
    .article-content code {
        background: var(--border-light); padding: 2px 8px; border-radius: 4px;
        font-size: 14px; font-family: 'SF Mono', 'Fira Code', monospace; color: var(--text-primary);
    }
    .article-content pre {
        background: var(--secondary); color: #e2e8f0; padding: 24px; border-radius: var(--radius-sm);
        overflow-x: auto; margin: 24px 0; font-size: 14px; line-height: 1.6;
    }
    .article-content pre code { background: transparent; padding: 0; color: inherit; }
    .article-content hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }

    /* ===== 文章侧栏 ===== */
    .article-sidebar { position: sticky; top: calc(var(--nav-height) + 32px); align-self: start; }
    .sidebar-card {
        background: var(--card-bg); border-radius: var(--radius); padding: 24px;
        border: 1px solid var(--border); box-shadow: var(--shadow-sm);
        margin-bottom: 20px;
    }
    .sidebar-card h4 { font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 16px; }
    .sidebar-card .tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
    .sidebar-card .tag-item {
        padding: 4px 14px; border-radius: 40px; font-size: 13px; font-weight: 500;
        background: var(--border-light); color: var(--text-secondary);
        transition: all var(--transition); cursor: default;
    }
    .sidebar-card .tag-item:hover { background: var(--primary-bg); color: var(--primary); }
    .sidebar-link-list { display: flex; flex-direction: column; gap: 10px; }
    .sidebar-link-list a {
        font-size: 14px; color: var(--text-secondary); display: flex; align-items: center; gap: 8px;
        transition: color var(--transition);
    }
    .sidebar-link-list a:hover { color: var(--primary); }
    .sidebar-link-list a i { width: 16px; opacity: 0.6; font-size: 13px; }

    /* ===== 文章未找到 ===== */
    .not-found-box {
        background: var(--card-bg); border-radius: var(--radius-lg);
        padding: 60px 48px; text-align: center;
        box-shadow: var(--shadow); border: 1px solid var(--border);
    }
    .not-found-box .icon { font-size: 48px; color: var(--text-muted); margin-bottom: 16px; }
    .not-found-box h2 { font-size: 24px; margin-bottom: 12px; }
    .not-found-box p { color: var(--text-secondary); margin-bottom: 24px; font-size: 15px; }

    /* ===== 相关文章 ===== */
    .related-section {
        padding: 48px 0 56px; background: var(--body-bg);
    }
    .related-section .section-header {
        display: flex; align-items: center; justify-content: space-between;
        margin-bottom: 28px; flex-wrap: wrap; gap: 12px;
    }
    .related-section .section-header h2 { font-size: 24px; font-weight: 700; }
    .related-grid {
        display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px;
    }
    .related-card {
        background: var(--card-bg); border-radius: var(--radius);
        border: 1px solid var(--border); overflow: hidden;
        transition: all var(--transition); box-shadow: var(--shadow-sm);
    }
    .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
    .related-card .card-img {
        width: 100%; aspect-ratio: 16/10; object-fit: cover;
        border-bottom: 1px solid var(--border);
    }
    .related-card .card-body { padding: 18px 20px 20px; }
    .related-card .card-body .badge { margin-bottom: 8px; }
    .related-card .card-body h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
    .related-card .card-body h3 a { color: var(--text-primary); text-decoration: none; }
    .related-card .card-body h3 a:hover { color: var(--primary); }
    .related-card .card-body p { font-size: 14px; color: var(--text-secondary); line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
    .related-card .card-footer {
        display: flex; align-items: center; justify-content: space-between;
        padding: 12px 20px; border-top: 1px solid var(--border-light);
        font-size: 12px; color: var(--text-muted);
    }

    /* ===== CTA ===== */
    .cta-section {
        padding: 56px 0 64px; background: var(--secondary);
        background-image: url('/assets/images/backpic/back-3.png');
        background-size: cover; background-position: center;
        background-blend-mode: overlay; position: relative;
    }
    .cta-section::before {
        content: ''; position: absolute; inset: 0;
        background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(30,41,59,0.75) 100%);
    }
    .cta-section .container { position: relative; z-index: 1; text-align: center; }
    .cta-section h2 { font-size: 30px; font-weight: 800; color: #fff; margin-bottom: 12px; }
    .cta-section p { color: rgba(255,255,255,0.7); font-size: 16px; max-width: 560px; margin: 0 auto 28px; }
    .cta-section .btn { background: #fff; color: var(--secondary); box-shadow: 0 4px 20px rgba(0,0,0,0.2); }
    .cta-section .btn:hover { background: var(--primary); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 28px rgba(37,99,235,0.4); }

    /* ===== 页脚 ===== */
    .site-footer {
        background: var(--secondary); color: rgba(255,255,255,0.7);
        padding: 48px 0 24px; border-top: 1px solid rgba(255,255,255,0.06);
    }
    .footer-inner {
        display: grid; grid-template-columns: 1fr 2fr; gap: 48px;
        margin-bottom: 32px;
    }
    .footer-brand .footer-logo {
        display: flex; align-items: center; gap: 8px;
        font-weight: 700; font-size: 18px; color: #fff; margin-bottom: 12px;
    }
    .footer-brand .footer-logo .logo-icon { background: var(--primary); }
    .footer-brand p { font-size: 14px; line-height: 1.6; max-width: 340px; }
    .footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .footer-links .col h4 { font-size: 13px; font-weight: 700; color: #fff; margin-bottom: 12px; text-transform: none; letter-spacing: 0.5px; }
    .footer-links .col a { display: block; font-size: 14px; color: rgba(255,255,255,0.6); padding: 4px 0; text-decoration: none; transition: color var(--transition); }
    .footer-links .col a:hover { color: #fff; }
    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,0.08);
        padding-top: 20px; text-align: center;
        font-size: 13px; color: rgba(255,255,255,0.45);
    }

    /* ===== 响应式 ===== */
    @media (max-width: 1024px) {
        .article-layout { grid-template-columns: 1fr; gap: 32px; }
        .article-sidebar { position: static; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
        .article-sidebar .sidebar-card { margin-bottom: 0; }
        .article-content { padding: 32px 28px; }
    }
    @media (max-width: 768px) {
        .site-header { padding: 8px 16px; }
        .nav-dock { padding: 6px 16px 6px 18px; border-radius: 40px; gap: 8px; }
        .nav-links { gap: 2px; }
        .nav-links a { padding: 4px 12px; font-size: 13px; }
        .nav-logo { font-size: 16px; }
        .nav-logo .logo-icon { width: 30px; height: 30px; font-size: 15px; }
        .nav-cta .btn { padding: 4px 14px; font-size: 12px; }
        .article-banner { padding: 120px 0 40px; min-height: 240px; }
        .article-banner h1 { font-size: 26px; }
        .article-content { padding: 24px 20px; }
        .article-content h2 { font-size: 22px; }
        .article-content p { font-size: 15px; }
        .related-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
        .footer-inner { grid-template-columns: 1fr; gap: 32px; }
        .footer-links { grid-template-columns: repeat(3, 1fr); gap: 16px; }
        .cta-section h2 { font-size: 24px; }
        .article-sidebar { grid-template-columns: 1fr; }
    }
    @media (max-width: 520px) {
        .site-header { padding: 6px 12px; }
        .nav-dock { padding: 4px 12px 4px 14px; border-radius: 32px; gap: 6px; flex-wrap: nowrap; }
        .nav-logo span:last-child { display: none; }
        .nav-logo .logo-icon { width: 28px; height: 28px; font-size: 14px; }
        .nav-links { gap: 0; }
        .nav-links a { padding: 3px 10px; font-size: 12px; }
        .nav-cta .btn { padding: 3px 12px; font-size: 11px; }
        .article-banner { padding: 100px 0 32px; min-height: 200px; }
        .article-banner h1 { font-size: 22px; }
        .article-meta-bar { font-size: 12px; gap: 10px; }
        .breadcrumb { font-size: 12px; }
        .article-content { padding: 20px 16px; border-radius: var(--radius); }
        .article-content h2 { font-size: 20px; }
        .article-content p { font-size: 14px; }
        .related-grid { grid-template-columns: 1fr; gap: 16px; }
        .footer-links { grid-template-columns: 1fr 1fr; gap: 20px; }
        .cta-section { padding: 40px 0; }
        .cta-section h2 { font-size: 20px; }
        .not-found-box { padding: 40px 24px; }
    }

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

/* 移动端导航折叠 (极简降级方案) */
    .nav-toggle {
        display: none; flex-direction: column; gap: 4px;
        background: none; border: none; cursor: pointer; padding: 6px;
        border-radius: 8px; transition: background var(--transition);
    }
    .nav-toggle span { display: block; width: 20px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: all var(--transition); }
    .nav-toggle:hover { background: var(--border-light); }
    @media (max-width: 640px) {
        .nav-toggle { display: flex; }
        .nav-links { display: none; position: absolute; top: calc(100% + 8px); left: 16px; right: 16px; background: rgba(255,255,255,0.96); backdrop-filter: blur(12px); border-radius: 16px; padding: 12px; flex-direction: column; gap: 4px; box-shadow: 0 12px 32px rgba(0,0,0,0.12); border: 1px solid var(--border); }
        .nav-links.is-open { display: flex; }
        .nav-dock { position: relative; }
    }
    @media (max-width: 520px) {
        .nav-links { left: 12px; right: 12px; }
    }
    /* 辅助: 小屏显示首页文字logo */
    @media (max-width: 480px) {
        .nav-logo span:last-child { display: none; }
    }
    @media (min-width: 521px) {
        .nav-logo span:last-child { display: inline; }
    }