/* roulang page: index */
:root {
        --primary: #4A90D9;
        --primary-dark: #357ABD;
        --secondary: #1E3A5F;
        --accent: #F59E0B;
        --accent-dark: #D48A0A;
        --bg: #F9FAFB;
        --card-bg: #FFFFFF;
        --text-dark: #1A202C;
        --text-muted: #718096;
        --text-light: #A0AEC0;
        --border: #D2D6DC;
        --danger: #E53E3E;
        --radius: 8px;
        --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.05);
        --shadow-hover: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
        --font-stack: -apple-system, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
        --max-width: 1200px;
        --header-top-height: 36px;
        --nav-height: 64px;
        --transition: 0.3s ease;
    }

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

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

    body {
        font-family: var(--font-stack);
        background: var(--bg);
        color: var(--text-dark);
        line-height: 1.6;
        -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);
        text-decoration: underline;
    }

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

    button,
    input,
    textarea,
    select {
        font-family: var(--font-stack);
        font-size: 1rem;
        border-radius: var(--radius);
        transition: all var(--transition);
    }

    button:focus-visible,
    input:focus-visible,
    textarea:focus-visible,
    select:focus-visible {
        outline: 2px solid var(--primary);
        outline-offset: 2px;
    }

    ul,
    ol {
        list-style: none;
    }

    .container {
        width: 100%;
        max-width: var(--max-width);
        margin: 0 auto;
        padding: 0 2rem;
    }

    @media (max-width: 768px) {
        .container {
            padding: 0 1rem;
        }
    }

    /* ===== 顶部信息条 ===== */
    .top-bar {
        height: var(--header-top-height);
        background: var(--secondary);
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 2rem;
        color: #fff;
        font-size: 0.85rem;
        position: relative;
        z-index: 101;
    }
    .top-bar .domain {
        opacity: 0.8;
        font-weight: 300;
    }
    .top-bar .tagline {
        text-align: center;
        flex: 1;
        opacity: 0.9;
        letter-spacing: 0.5px;
    }
    .top-bar .top-cta a {
        display: inline-block;
        background: var(--accent);
        color: #fff;
        padding: 4px 18px;
        border-radius: 20px;
        font-size: 0.8rem;
        font-weight: 600;
        transition: background var(--transition), transform var(--transition);
        text-decoration: none;
    }
    .top-bar .top-cta a:hover {
        background: var(--accent-dark);
        transform: translateY(-1px);
    }

    @media (max-width: 768px) {
        .top-bar {
            padding: 0 1rem;
            font-size: 0.75rem;
        }
        .top-bar .tagline {
            display: none;
        }
        .top-bar .top-cta a {
            padding: 3px 14px;
            font-size: 0.7rem;
        }
    }

    /* ===== 主导航 ===== */
    .main-header {
        position: sticky;
        top: var(--header-top-height);
        z-index: 100;
        background: var(--card-bg);
        box-shadow: 0 2px 8px rgba(0,0,0,0.06);
        height: var(--nav-height);
        display: flex;
        align-items: center;
    }
    .main-header .container {
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
    .site-logo {
        display: flex;
        align-items: center;
        gap: 10px;
        text-decoration: none;
        color: var(--text-dark);
        font-weight: 700;
        font-size: 1.4rem;
        letter-spacing: -0.5px;
    }
    .site-logo:hover {
        text-decoration: none;
        color: var(--text-dark);
    }
    .site-logo .logo-icon {
        width: 36px;
        height: 36px;
        background: var(--primary);
        border-radius: 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: #fff;
        font-size: 1.2rem;
        font-weight: 700;
        flex-shrink: 0;
    }
    .site-logo .logo-text {
        color: var(--text-dark);
    }
    .site-logo .logo-text span {
        color: var(--primary);
    }

    .main-nav {
        display: flex;
        align-items: center;
        gap: 1.8rem;
    }
    .main-nav a {
        color: var(--text-dark);
        font-weight: 500;
        font-size: 0.95rem;
        position: relative;
        padding: 4px 0;
        text-decoration: none;
        transition: color var(--transition);
    }
    .main-nav a:hover,
    .main-nav a.active {
        color: var(--primary);
        text-decoration: none;
    }
    .main-nav a.active::after {
        content: '';
        position: absolute;
        bottom: -2px;
        left: 0;
        width: 100%;
        height: 2px;
        background: var(--primary);
        border-radius: 2px;
    }
    .main-nav .nav-cta {
        background: var(--accent);
        color: #fff !important;
        padding: 8px 24px !important;
        border-radius: 30px;
        font-weight: 600;
        font-size: 0.9rem;
        transition: background var(--transition), transform var(--transition);
        text-decoration: none !important;
    }
    .main-nav .nav-cta:hover {
        background: var(--accent-dark);
        transform: translateY(-2px);
        color: #fff !important;
    }

    /* 汉堡菜单 */
    .hamburger {
        display: none;
        flex-direction: column;
        gap: 5px;
        cursor: pointer;
        background: none;
        border: none;
        padding: 8px;
    }
    .hamburger span {
        display: block;
        width: 26px;
        height: 3px;
        background: var(--text-dark);
        border-radius: 3px;
        transition: all var(--transition);
    }
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -6px);
    }

    @media (max-width: 1024px) {
        .main-nav {
            position: fixed;
            top: calc(var(--header-top-height) + var(--nav-height));
            left: 0;
            right: 0;
            background: var(--card-bg);
            flex-direction: column;
            padding: 2rem 1.5rem;
            gap: 1.2rem;
            box-shadow: var(--shadow);
            transform: translateY(-120%);
            opacity: 0;
            transition: all var(--transition);
            pointer-events: none;
            z-index: 99;
        }
        .main-nav.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }
        .main-nav a {
            font-size: 1.05rem;
        }
        .main-nav a.active::after {
            display: none;
        }
        .main-nav .nav-cta {
            text-align: center;
            width: 100%;
        }
        .hamburger {
            display: flex;
        }
    }

    @media (max-width: 520px) {
        .site-logo {
            font-size: 1.1rem;
        }
        .site-logo .logo-icon {
            width: 30px;
            height: 30px;
            font-size: 1rem;
        }
    }

    /* ===== Hero 首屏 ===== */
    .hero {
        position: relative;
        min-height: 70vh;
        display: flex;
        align-items: center;
        background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
    }
    .hero::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(30,58,95,0.85) 0%, rgba(74,144,217,0.6) 100%);
        z-index: 1;
    }
    .hero .container {
        position: relative;
        z-index: 2;
        text-align: center;
        color: #fff;
        padding: 4rem 2rem;
    }
    .hero h1 {
        font-size: 2.8rem;
        font-weight: 700;
        line-height: 1.3;
        margin-bottom: 1.2rem;
        letter-spacing: -0.5px;
    }
    .hero h1 span {
        color: var(--accent);
    }
    .hero .hero-sub {
        font-size: 1.2rem;
        font-weight: 400;
        opacity: 0.95;
        max-width: 720px;
        margin: 0 auto 2rem;
        line-height: 1.7;
    }
    .hero .hero-actions {
        display: flex;
        justify-content: center;
        gap: 1rem;
        flex-wrap: wrap;
    }
    .hero .hero-actions .btn-primary {
        background: var(--accent);
        color: #fff;
        padding: 14px 40px;
        border-radius: 30px;
        font-weight: 600;
        font-size: 1.05rem;
        border: none;
        cursor: pointer;
        transition: background var(--transition), transform var(--transition);
        text-decoration: none;
    }
    .hero .hero-actions .btn-primary:hover {
        background: var(--accent-dark);
        transform: translateY(-3px);
        color: #fff;
        text-decoration: none;
    }
    .hero .hero-actions .btn-secondary {
        background: transparent;
        color: #fff;
        padding: 14px 36px;
        border-radius: 30px;
        font-weight: 500;
        font-size: 1.05rem;
        border: 2px solid rgba(255,255,255,0.7);
        cursor: pointer;
        transition: all var(--transition);
        text-decoration: none;
    }
    .hero .hero-actions .btn-secondary:hover {
        background: rgba(255,255,255,0.15);
        border-color: #fff;
        transform: translateY(-3px);
        color: #fff;
        text-decoration: none;
    }

    @media (max-width: 768px) {
        .hero {
            min-height: 50vh;
        }
        .hero h1 {
            font-size: 1.8rem;
        }
        .hero .hero-sub {
            font-size: 1rem;
        }
        .hero .container {
            padding: 2.5rem 1rem;
        }
    }

    /* ===== 指标看板 ===== */
    .metrics {
        background: var(--card-bg);
        padding: 2.5rem 0;
        box-shadow: var(--shadow);
        position: relative;
        z-index: 3;
        margin-top: -2rem;
        border-radius: var(--radius) var(--radius) 0 0;
    }
    .metrics .grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 1.5rem;
    }
    .metrics .metric-card {
        text-align: center;
        padding: 1.2rem 0.5rem;
        border-right: 1px solid var(--border);
    }
    .metrics .metric-card:last-child {
        border-right: none;
    }
    .metrics .metric-icon {
        font-size: 2.2rem;
        color: var(--primary);
        margin-bottom: 0.5rem;
    }
    .metrics .metric-number {
        font-size: 2.2rem;
        font-weight: 700;
        color: var(--primary);
        line-height: 1.2;
    }
    .metrics .metric-label {
        font-size: 0.9rem;
        color: var(--text-muted);
        margin-top: 0.3rem;
    }

    @media (max-width: 1024px) {
        .metrics .grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .metrics .metric-card:nth-child(2) {
            border-right: none;
        }
        .metrics .metric-card:nth-child(1),
        .metrics .metric-card:nth-child(2) {
            border-bottom: 1px solid var(--border);
            padding-bottom: 1.5rem;
        }
        .metrics .metric-card:nth-child(3),
        .metrics .metric-card:nth-child(4) {
            padding-top: 1.5rem;
        }
    }

    @media (max-width: 520px) {
        .metrics .grid {
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }
        .metrics .metric-card {
            border-right: none;
            border-bottom: 1px solid var(--border);
            padding: 1rem 0;
        }
        .metrics .metric-card:nth-last-child(-n+2) {
            border-bottom: none;
        }
        .metrics .metric-number {
            font-size: 1.6rem;
        }
    }

    /* ===== 通用板块 ===== */
    .section {
        padding: 4rem 0;
    }
    .section-title {
        text-align: center;
        margin-bottom: 3rem;
    }
    .section-title h2 {
        font-size: 2rem;
        font-weight: 600;
        color: var(--text-dark);
        margin-bottom: 0.6rem;
    }
    .section-title p {
        font-size: 1.05rem;
        color: var(--text-muted);
        max-width: 600px;
        margin: 0 auto;
    }

    @media (max-width: 768px) {
        .section {
            padding: 2.5rem 0;
        }
        .section-title h2 {
            font-size: 1.5rem;
        }
    }

    /* ===== 服务矩阵 ===== */
    .services-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
    .service-card {
        background: var(--card-bg);
        border-radius: var(--radius);
        overflow: hidden;
        box-shadow: var(--shadow);
        transition: transform var(--transition), box-shadow var(--transition);
        display: flex;
        flex-direction: column;
    }
    .service-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-hover);
    }
    .service-card .card-img {
        height: 200px;
        background: var(--bg);
        overflow: hidden;
    }
    .service-card .card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.5s ease;
    }
    .service-card:hover .card-img img {
        transform: scale(1.05);
    }
    .service-card .card-body {
        padding: 1.5rem;
        flex: 1;
        display: flex;
        flex-direction: column;
    }
    .service-card .card-body h3 {
        font-size: 1.3rem;
        font-weight: 600;
        margin-bottom: 0.6rem;
    }
    .service-card .card-body p {
        color: var(--text-muted);
        font-size: 0.95rem;
        line-height: 1.6;
        margin-bottom: 1rem;
        flex: 1;
    }
    .service-card .card-body .card-link {
        color: var(--primary);
        font-weight: 500;
        font-size: 0.9rem;
        display: inline-flex;
        align-items: center;
        gap: 4px;
        text-decoration: none;
    }
    .service-card .card-body .card-link:hover {
        color: var(--primary-dark);
        text-decoration: underline;
    }

    @media (max-width: 1024px) {
        .services-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }
    @media (max-width: 640px) {
        .services-grid {
            grid-template-columns: 1fr;
        }
    }

    /* ===== 结果对比 ===== */
    .compare-section {
        background: var(--card-bg);
    }
    .compare-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
        align-items: start;
    }
    .compare-col h3 {
        font-size: 1.3rem;
        font-weight: 600;
        margin-bottom: 1.2rem;
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .compare-col .badge {
        display: inline-block;
        padding: 2px 12px;
        border-radius: 20px;
        font-size: 0.75rem;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }
    .badge-old {
        background: #EDF2F7;
        color: #4A5568;
    }
    .badge-new {
        background: #C6F6D5;
        color: #22543D;
    }
    .compare-col ul {
        list-style: none;
        padding: 0;
    }
    .compare-col ul li {
        padding: 0.7rem 0;
        border-bottom: 1px solid var(--border);
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 0.95rem;
        color: var(--text-dark);
    }
    .compare-col ul li .icon {
        font-size: 1.2rem;
        flex-shrink: 0;
        width: 24px;
        text-align: center;
    }
    .compare-col ul li .icon.ok {
        color: #38A169;
    }
    .compare-col ul li .icon.no {
        color: var(--danger);
    }
    .compare-col .visual-bar {
        margin-top: 1.5rem;
        padding: 1.2rem;
        background: var(--bg);
        border-radius: var(--radius);
    }
    .compare-col .visual-bar .bar-item {
        display: flex;
        align-items: center;
        gap: 12px;
        margin-bottom: 0.8rem;
    }
    .compare-col .visual-bar .bar-item:last-child {
        margin-bottom: 0;
    }
    .compare-col .visual-bar .bar-label {
        width: 80px;
        font-size: 0.85rem;
        color: var(--text-muted);
        flex-shrink: 0;
    }
    .compare-col .visual-bar .bar-track {
        flex: 1;
        height: 18px;
        background: #EDF2F7;
        border-radius: 10px;
        overflow: hidden;
    }
    .compare-col .visual-bar .bar-track .bar-fill {
        height: 100%;
        border-radius: 10px;
        transition: width 1s ease;
    }
    .bar-fill.old {
        background: #CBD5E0;
    }
    .bar-fill.new {
        background: var(--primary);
    }

    @media (max-width: 768px) {
        .compare-grid {
            grid-template-columns: 1fr;
            gap: 2rem;
        }
    }

    /* ===== 最新资讯动态 ===== */
    .news-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    .news-card {
        background: var(--card-bg);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 1.5rem;
        transition: transform var(--transition), box-shadow var(--transition);
        display: flex;
        flex-direction: column;
    }
    .news-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-hover);
    }
    .news-card .news-meta {
        display: flex;
        align-items: center;
        gap: 12px;
        margin-bottom: 0.6rem;
        font-size: 0.8rem;
        color: var(--text-muted);
    }
    .news-card .news-meta .tag {
        background: var(--secondary);
        color: #fff;
        padding: 2px 12px;
        border-radius: 20px;
        font-size: 0.7rem;
        font-weight: 500;
    }
    .news-card h3 {
        font-size: 1.1rem;
        font-weight: 600;
        margin-bottom: 0.6rem;
        line-height: 1.4;
    }
    .news-card h3 a {
        color: var(--text-dark);
        text-decoration: none;
    }
    .news-card h3 a:hover {
        color: var(--primary);
        text-decoration: underline;
    }
    .news-card p {
        color: var(--text-muted);
        font-size: 0.9rem;
        line-height: 1.6;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        flex: 1;
    }
    .news-card .news-footer {
        margin-top: 1rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
        font-size: 0.8rem;
        color: var(--text-light);
    }
    .news-card .news-footer a {
        color: var(--primary);
        font-weight: 500;
        text-decoration: none;
    }
    .news-card .news-footer a:hover {
        text-decoration: underline;
    }

    .news-empty {
        grid-column: 1 / -1;
        padding: 3rem 2rem;
        text-align: center;
        background: var(--card-bg);
        border-radius: var(--radius);
        border: 2px dashed var(--border);
        color: var(--text-muted);
        font-size: 1rem;
    }

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

    /* ===== FAQ 手风琴 ===== */
    .faq-list {
        max-width: 800px;
        margin: 0 auto;
    }
    .faq-item {
        border-bottom: 1px solid var(--border);
        padding: 0.2rem 0;
    }
    .faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 1.2rem 0;
        cursor: pointer;
        font-weight: 600;
        font-size: 1.05rem;
        color: var(--text-dark);
        background: none;
        border: none;
        width: 100%;
        text-align: left;
        gap: 12px;
        transition: color var(--transition);
    }
    .faq-question:hover {
        color: var(--primary);
    }
    .faq-question .arrow {
        font-size: 1.2rem;
        transition: transform var(--transition);
        flex-shrink: 0;
        color: var(--text-muted);
    }
    .faq-item.open .faq-question .arrow {
        transform: rotate(180deg);
        color: var(--primary);
    }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease, padding 0.3s ease;
        padding: 0 0;
        color: var(--text-muted);
        line-height: 1.7;
        font-size: 0.95rem;
    }
    .faq-item.open .faq-answer {
        max-height: 400px;
        padding: 0 0 1.2rem 0;
    }

    /* ===== 转化表单 ===== */
    .form-section {
        background: var(--card-bg);
    }
    .form-wrapper {
        max-width: 640px;
        margin: 0 auto;
        padding: 2rem;
        background: var(--bg);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
    }
    .form-wrapper .form-group {
        margin-bottom: 1.2rem;
    }
    .form-wrapper label {
        display: block;
        font-weight: 500;
        margin-bottom: 0.4rem;
        font-size: 0.9rem;
        color: var(--text-dark);
    }
    .form-wrapper input,
    .form-wrapper textarea,
    .form-wrapper select {
        width: 100%;
        padding: 12px 14px;
        border: 1px solid var(--border);
        border-radius: var(--radius);
        background: #fff;
        font-size: 0.95rem;
        transition: border-color var(--transition), box-shadow var(--transition);
    }
    .form-wrapper input:focus,
    .form-wrapper textarea:focus {
        border-color: var(--primary);
        box-shadow: 0 0 0 3px rgba(74,144,217,0.15);
        outline: none;
    }
    .form-wrapper textarea {
        min-height: 100px;
        resize: vertical;
    }
    .form-wrapper .submit-btn {
        width: 100%;
        padding: 14px;
        background: var(--accent);
        color: #fff;
        font-size: 1.05rem;
        font-weight: 600;
        border: none;
        border-radius: 30px;
        cursor: pointer;
        transition: background var(--transition), transform var(--transition);
    }
    .form-wrapper .submit-btn:hover {
        background: var(--accent-dark);
        transform: translateY(-2px);
    }
    .form-wrapper .submit-btn:active {
        transform: scale(0.98);
    }
    .form-wrapper .privacy-note {
        margin-top: 1rem;
        font-size: 0.8rem;
        color: var(--text-muted);
        text-align: center;
    }

    /* ===== 页脚 ===== */
    .site-footer {
        background: var(--secondary);
        color: #fff;
        padding: 3rem 0 0;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 1.5fr 1fr 1.2fr;
        gap: 2.5rem;
        padding-bottom: 2rem;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .footer-col h4 {
        font-size: 1.1rem;
        font-weight: 600;
        margin-bottom: 1rem;
        color: #fff;
    }
    .footer-col p,
    .footer-col a {
        color: rgba(255,255,255,0.75);
        font-size: 0.9rem;
        line-height: 1.7;
    }
    .footer-col a:hover {
        color: var(--accent);
        text-decoration: underline;
    }
    .footer-col .footer-logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 1.2rem;
        font-weight: 700;
        color: #fff;
        margin-bottom: 0.8rem;
    }
    .footer-col .footer-logo .logo-icon {
        width: 32px;
        height: 32px;
        background: var(--primary);
        border-radius: 6px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: #fff;
        font-size: 1rem;
        font-weight: 700;
    }
    .footer-col ul li {
        margin-bottom: 0.4rem;
    }
    .footer-col ul li a {
        color: rgba(255,255,255,0.75);
        text-decoration: none;
    }
    .footer-col ul li a:hover {
        color: var(--accent);
    }
    .footer-col .contact-item {
        display: flex;
        align-items: center;
        gap: 8px;
        margin-bottom: 0.5rem;
        color: rgba(255,255,255,0.75);
        font-size: 0.9rem;
    }
    .footer-bottom {
        text-align: center;
        padding: 1.5rem 0;
        color: rgba(255,255,255,0.5);
        font-size: 0.8rem;
    }

    @media (max-width: 768px) {
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 2rem;
        }
    }

    /* ===== 通用工具 ===== */
    .text-center {
        text-align: center;
    }
    .mt-2 {
        margin-top: 2rem;
    }
    .mb-2 {
        margin-bottom: 2rem;
    }
    .btn {
        display: inline-block;
        padding: 12px 32px;
        border-radius: var(--radius);
        font-weight: 600;
        font-size: 0.95rem;
        border: none;
        cursor: pointer;
        transition: all var(--transition);
        text-decoration: none;
    }
    .btn-primary-solid {
        background: var(--primary);
        color: #fff;
    }
    .btn-primary-solid:hover {
        background: var(--primary-dark);
        transform: translateY(-2px);
        color: #fff;
        text-decoration: none;
    }
    .btn-outline {
        background: transparent;
        color: var(--primary);
        border: 2px solid var(--primary);
    }
    .btn-outline:hover {
        background: var(--primary);
        color: #fff;
        transform: translateY(-2px);
        text-decoration: none;
    }

    /* 辅助 */
    .bg-white {
        background: var(--card-bg);
    }
    .bg-light {
        background: var(--bg);
    }

    /* 统计数字动画（纯CSS占位，实际可用JS） */
    .count-up {
        display: inline-block;
    }

/* roulang page: category1 */
:root {
            --primary: #4A90D9;
            --primary-dark: #357ABD;
            --primary-light: #6BA3E0;
            --secondary: #1E3A5F;
            --secondary-light: #2A4F7A;
            --accent: #F59E0B;
            --accent-dark: #D48A00;
            --bg: #F9FAFB;
            --card-bg: #FFFFFF;
            --text: #1A202C;
            --text-light: #718096;
            --text-white: #FFFFFF;
            --border: #E2E8F0;
            --radius: 8px;
            --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.05);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.05);
            --transition: all 0.3s ease;
            --max-width: 1200px;
            --gap: 2rem;
            --font-stack: -apple-system, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-stack);
            font-size: 1rem;
            line-height: 1.6;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

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

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

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 2rem;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 1rem;
            }
        }

        /* ===== Top Bar ===== */
        .top-bar {
            background: var(--secondary);
            height: 36px;
            display: flex;
            align-items: center;
            color: var(--text-white);
            font-size: 0.875rem;
            position: relative;
            z-index: 101;
        }
        .top-bar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .top-bar .domain-text {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.8rem;
        }
        .top-bar .slogan {
            color: rgba(255, 255, 255, 0.9);
            font-weight: 500;
            letter-spacing: 0.5px;
        }
        .top-bar .top-cta {
            background: var(--accent);
            color: var(--text);
            padding: 2px 16px;
            border-radius: 4px;
            font-weight: 600;
            font-size: 0.8rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .top-bar .top-cta:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
            text-decoration: none;
        }

        @media (max-width: 640px) {
            .top-bar .slogan {
                display: none;
            }
            .top-bar .domain-text {
                font-size: 0.7rem;
            }
            .top-bar .top-cta {
                font-size: 0.7rem;
                padding: 2px 10px;
            }
        }

        /* ===== Main Nav ===== */
        .main-nav {
            background: var(--card-bg);
            height: 64px;
            display: flex;
            align-items: center;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: var(--transition);
        }
        .main-nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .main-nav .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text);
            text-decoration: none;
        }
        .main-nav .logo:hover {
            text-decoration: none;
        }
        .main-nav .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.2rem;
        }
        .main-nav .logo span:last-child {
            color: var(--secondary);
        }
        .main-nav .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
        }
        .main-nav .nav-links li {
            margin: 0;
        }
        .main-nav .nav-links a {
            display: block;
            padding: 6px 16px;
            border-radius: 6px;
            color: var(--text);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .main-nav .nav-links a:hover {
            background: rgba(74, 144, 217, 0.08);
            color: var(--primary);
            text-decoration: none;
        }
        .main-nav .nav-links a.active {
            background: var(--primary);
            color: #fff;
        }
        .main-nav .nav-links a.active:hover {
            background: var(--primary-dark);
            color: #fff;
        }
        .main-nav .nav-links a.nav-cta {
            background: var(--accent);
            color: var(--text);
            font-weight: 600;
            padding: 6px 24px;
            margin-left: 8px;
        }
        .main-nav .nav-links a.nav-cta:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
            text-decoration: none;
        }
        .main-nav .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            background: none;
            border: none;
            padding: 8px;
        }
        .main-nav .hamburger span {
            width: 26px;
            height: 2.5px;
            background: var(--text);
            border-radius: 2px;
            transition: var(--transition);
        }

        @media (max-width: 1024px) {
            .main-nav .nav-links {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--card-bg);
                flex-direction: column;
                padding: 1rem 2rem;
                box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
                border-radius: 0 0 var(--radius) var(--radius);
                gap: 0.25rem;
            }
            .main-nav .nav-links.open {
                display: flex;
            }
            .main-nav .nav-links a {
                padding: 10px 16px;
                width: 100%;
            }
            .main-nav .nav-links a.nav-cta {
                margin-left: 0;
                margin-top: 8px;
                text-align: center;
            }
            .main-nav .hamburger {
                display: flex;
            }
        }

        @media (max-width: 640px) {
            .main-nav .nav-links.open {
                padding: 1rem 1rem;
            }
        }

        /* ===== Hero ===== */
        .page-hero {
            position: relative;
            min-height: 45vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: linear-gradient(135deg, rgba(30, 58, 95, 0.88), rgba(74, 144, 217, 0.72)), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            color: var(--text-white);
            padding: 4rem 2rem;
        }
        .page-hero h1 {
            font-size: 2.8rem;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 1rem;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }
        .page-hero p {
            font-size: 1.2rem;
            max-width: 680px;
            margin: 0 auto 1.8rem;
            opacity: 0.92;
            line-height: 1.7;
        }
        .page-hero .hero-cta {
            display: inline-block;
            background: var(--accent);
            color: var(--text);
            font-weight: 700;
            padding: 14px 42px;
            border-radius: 8px;
            font-size: 1.1rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
        }
        .page-hero .hero-cta:hover {
            background: var(--accent-dark);
            transform: translateY(-3px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
            text-decoration: none;
        }
        .page-hero .hero-secondary {
            display: inline-block;
            margin-left: 12px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: 8px;
            font-size: 1.05rem;
            border: 2px solid rgba(255, 255, 255, 0.6);
            transition: var(--transition);
            cursor: pointer;
            text-decoration: none;
        }
        .page-hero .hero-secondary:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.1);
            text-decoration: none;
        }

        @media (max-width: 768px) {
            .page-hero {
                min-height: 38vh;
                padding: 3rem 1.5rem;
            }
            .page-hero h1 {
                font-size: 2rem;
            }
            .page-hero p {
                font-size: 1rem;
            }
            .page-hero .hero-cta,
            .page-hero .hero-secondary {
                display: block;
                width: 100%;
                margin: 0.5rem 0;
                text-align: center;
            }
        }

        /* ===== Sections ===== */
        .section {
            padding: 4.5rem 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
        }
        .section-title h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 0.75rem;
        }
        .section-title p {
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
            font-size: 1.05rem;
        }

        .section-bg-light {
            background: var(--bg);
        }
        .section-bg-white {
            background: #fff;
        }
        .section-bg-dark {
            background: var(--secondary);
            color: var(--text-white);
        }
        .section-bg-dark .section-title h2 {
            color: #fff;
        }
        .section-bg-dark .section-title p {
            color: rgba(255, 255, 255, 0.7);
        }

        @media (max-width: 768px) {
            .section {
                padding: 3rem 0;
            }
            .section-title h2 {
                font-size: 1.6rem;
            }
        }

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

        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .grid-3,
            .grid-2,
            .grid-4 {
                grid-template-columns: 1fr;
            }
        }

        .card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: var(--transition);
            padding: 1.8rem;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: var(--radius) var(--radius) 0 0;
            margin: -1.8rem -1.8rem 1.2rem -1.8rem;
            width: calc(100% + 3.6rem);
        }
        .card h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text);
        }
        .card p {
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.6;
            margin-bottom: 0.8rem;
        }
        .card .card-link {
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .card .card-link:hover {
            color: var(--primary-dark);
            text-decoration: none;
        }

        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin-bottom: 1rem;
            background: rgba(74, 144, 217, 0.1);
            color: var(--primary);
        }

        /* ===== Stats / Metrics ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
        }
        .stat-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 2rem 1.5rem;
            text-align: center;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }
        .stat-card .stat-icon {
            font-size: 2.2rem;
            color: var(--primary);
            margin-bottom: 0.5rem;
        }
        .stat-card .stat-number {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-card .stat-label {
            color: var(--text-light);
            font-size: 0.9rem;
            margin-top: 0.3rem;
        }

        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Comparison ===== */
        .comparison-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2.5rem;
            align-items: center;
        }
        .comparison-box {
            border-radius: var(--radius);
            padding: 2.5rem 2rem;
            border: 2px solid var(--border);
            transition: var(--transition);
        }
        .comparison-box.before {
            background: #F1F3F5;
            border-color: #DEE2E6;
        }
        .comparison-box.after {
            background: rgba(74, 144, 217, 0.06);
            border-color: var(--primary);
        }
        .comparison-box h4 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .comparison-box ul {
            list-style: none;
            padding: 0;
        }
        .comparison-box ul li {
            padding: 6px 0;
            font-size: 0.95rem;
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }
        .comparison-box ul li::before {
            content: "✗";
            color: #E53E3E;
            font-weight: 700;
        }
        .comparison-box.after ul li::before {
            content: "✓";
            color: #38A169;
            font-weight: 700;
        }

        @media (max-width: 768px) {
            .comparison-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }

        /* ===== Flow / Process ===== */
        .flow-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            counter-reset: step;
        }
        .flow-step {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 2rem 1.5rem;
            text-align: center;
            box-shadow: var(--shadow);
            position: relative;
            transition: var(--transition);
        }
        .flow-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .flow-step .step-number {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
        }
        .flow-step h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        .flow-step p {
            color: var(--text-light);
            font-size: 0.9rem;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border);
            padding: 1rem 0;
        }
        .faq-item:first-child {
            border-top: 1px solid var(--border);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 0;
            user-select: none;
            color: var(--text);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-family: inherit;
        }
        .faq-question .faq-arrow {
            transition: transform 0.3s ease;
            font-size: 1.2rem;
            flex-shrink: 0;
            margin-left: 1rem;
        }
        .faq-question.open .faq-arrow {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-light);
            line-height: 1.7;
        }
        .faq-answer.open {
            max-height: 400px;
            padding: 0.5rem 0 1rem 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--secondary), var(--primary-dark));
            color: #fff;
            text-align: center;
            padding: 4rem 2rem;
            border-radius: 0;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .cta-section p {
            max-width: 600px;
            margin: 0 auto 2rem;
            opacity: 0.9;
            font-size: 1.1rem;
        }
        .cta-section .cta-btn {
            display: inline-block;
            background: var(--accent);
            color: var(--text);
            font-weight: 700;
            padding: 16px 48px;
            border-radius: 8px;
            font-size: 1.1rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
        }
        .cta-section .cta-btn:hover {
            background: var(--accent-dark);
            transform: translateY(-3px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
            text-decoration: none;
        }
        .cta-section .cta-secondary {
            display: inline-block;
            margin-left: 12px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            padding: 16px 36px;
            border-radius: 8px;
            font-size: 1.05rem;
            border: 2px solid rgba(255, 255, 255, 0.5);
            transition: var(--transition);
            text-decoration: none;
        }
        .cta-section .cta-secondary:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.1);
            text-decoration: none;
        }
        @media (max-width: 640px) {
            .cta-section .cta-btn,
            .cta-section .cta-secondary {
                display: block;
                width: 100%;
                margin: 0.5rem 0;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--secondary);
            color: rgba(255, 255, 255, 0.9);
            padding: 3.5rem 0 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2.5rem;
            padding-bottom: 2rem;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 1rem;
        }
        .footer-logo .logo-icon {
            width: 38px;
            height: 38px;
            background: var(--primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.3rem;
            color: #fff;
        }
        .footer-col p {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-col h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 1rem;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
        }
        .footer-col ul li {
            margin-bottom: 0.5rem;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .contact-item {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
            margin-bottom: 0.6rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding: 1.5rem 0;
            text-align: center;
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.85rem;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .footer-col p {
                max-width: 100%;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }
        .gap-1 {
            gap: 1rem;
        }

        /* ===== Scenario Cards ===== */
        .scenario-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 2rem 1.8rem;
            box-shadow: var(--shadow);
            border-left: 4px solid var(--primary);
            transition: var(--transition);
        }
        .scenario-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }
        .scenario-card h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 0.6rem;
        }
        .scenario-card p {
            color: var(--text-light);
            font-size: 0.92rem;
        }

        /* ===== Responsive tweaks ===== */
        @media (max-width: 1024px) {
            .grid-3,
            .grid-2 {
                gap: 1.5rem;
            }
        }
        @media (max-width: 768px) {
            .section {
                padding: 2.5rem 0;
            }
            .page-hero h1 {
                font-size: 1.8rem;
            }
            .flow-steps {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 520px) {
            .flow-steps {
                grid-template-columns: 1fr;
            }
            .card .card-img {
                height: 160px;
            }
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #4A90D9;
            --primary-dark: #357ABD;
            --primary-light: #6BA8E8;
            --secondary: #1E3A5F;
            --secondary-light: #2A4F7A;
            --accent: #F59E0B;
            --accent-dark: #D48A08;
            --bg-light: #F9FAFB;
            --bg-white: #FFFFFF;
            --text-dark: #1A202C;
            --text-muted: #718096;
            --text-light: #A0AEC0;
            --border-color: #E2E8F0;
            --border-focus: #4A90D9;
            --danger: #E53E3E;
            --radius: 8px;
            --radius-lg: 12px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.05);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.05);
            --shadow-hover: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
            --font-family: -apple-system, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --max-width: 1200px;
            --header-top-height: 36px;
            --nav-height: 64px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 基础重置 ===== */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-family);
            font-size: 1rem;
            line-height: 1.6;
            color: var(--text-dark);
            background: var(--bg-light);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            line-height: 1.4;
            color: var(--text-dark);
        }
        p {
            margin-bottom: 1rem;
        }
        ul, ol {
            padding-left: 1.5rem;
            margin-bottom: 1rem;
        }
        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
            outline: none;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 2rem;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 1rem;
            }
        }

        /* ===== 顶部信息条 ===== */
        .top-bar {
            height: var(--header-top-height);
            background: var(--secondary);
            color: #fff;
            display: flex;
            align-items: center;
            font-size: 0.8rem;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1001;
        }
        .top-bar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .top-bar .domain {
            opacity: 0.8;
            font-weight: 400;
        }
        .top-bar .slogan {
            opacity: 0.9;
            font-weight: 300;
            letter-spacing: 0.5px;
        }
        .top-bar .action-btn {
            background: var(--accent);
            color: #fff;
            border: none;
            padding: 4px 18px;
            border-radius: 4px;
            font-size: 0.78rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            line-height: 1.8;
        }
        .top-bar .action-btn:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
        }
        @media (max-width: 768px) {
            .top-bar .slogan {
                display: none;
            }
            .top-bar .action-btn {
                font-size: 0.7rem;
                padding: 3px 12px;
            }
        }

        /* ===== 主导航 ===== */
        .main-nav {
            position: fixed;
            top: var(--header-top-height);
            left: 0;
            right: 0;
            height: var(--nav-height);
            background: var(--bg-white);
            box-shadow: 0 1px 4px rgba(0,0,0,0.06);
            z-index: 1000;
            display: flex;
            align-items: center;
            transition: var(--transition);
        }
        .main-nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .main-nav .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-dark);
            text-decoration: none;
        }
        .main-nav .logo:hover {
            color: var(--text-dark);
        }
        .main-nav .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            border-radius: var(--radius);
            font-weight: 800;
            font-size: 1.2rem;
        }
        .main-nav .logo span:last-child {
            color: var(--text-dark);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .nav-links a {
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            text-decoration: none;
            transition: var(--transition);
            position: relative;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: rgba(74, 144, 217, 0.06);
        }
        .nav-links a.active {
            color: var(--primary);
            background: rgba(74, 144, 217, 0.1);
            font-weight: 600;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }
        .nav-links .nav-cta {
            background: var(--primary);
            color: #fff !important;
            padding: 0.5rem 1.5rem;
            border-radius: var(--radius);
            font-weight: 600;
            margin-left: 0.5rem;
        }
        .nav-links .nav-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .nav-links .nav-cta.active {
            background: var(--primary-dark);
            color: #fff !important;
        }
        .nav-links .nav-cta.active::after {
            display: none;
        }

        /* 汉堡菜单 */
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 40px;
            height: 40px;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .hamburger:hover {
            background: var(--bg-light);
        }
        .hamburger span {
            display: block;
            width: 22px;
            height: 2.5px;
            background: var(--text-dark);
            border-radius: 2px;
            margin: 3px 0;
            transition: var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(6px, -6px);
        }

        @media (max-width: 1024px) {
            .hamburger {
                display: flex;
            }
            .nav-links {
                position: fixed;
                top: calc(var(--header-top-height) + var(--nav-height));
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 1rem;
                gap: 0.25rem;
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                border-top: 1px solid var(--border-color);
                max-height: calc(100vh - 180px);
                overflow-y: auto;
            }
            .nav-links.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-links a {
                width: 100%;
                padding: 0.75rem 1rem;
                font-size: 1rem;
            }
            .nav-links a.active::after {
                display: none;
            }
            .nav-links .nav-cta {
                margin-left: 0;
                margin-top: 0.5rem;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .main-nav .logo {
                font-size: 1.2rem;
            }
            .main-nav .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 1rem;
            }
        }

        /* ===== 页面主体偏移 ===== */
        .page-wrapper {
            padding-top: calc(var(--header-top-height) + var(--nav-height));
            min-height: 100vh;
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            padding: 0.85rem 0;
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.4rem;
            font-size: 0.88rem;
            color: var(--text-muted);
        }
        .breadcrumb a {
            color: var(--text-muted);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .separator {
            color: var(--text-light);
            margin: 0 0.15rem;
        }
        .breadcrumb .current {
            color: var(--text-dark);
            font-weight: 500;
            max-width: 400px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        @media (max-width: 768px) {
            .breadcrumb .current {
                max-width: 220px;
            }
        }

        /* ===== 文章页面 ===== */
        .article-page {
            background: var(--bg-white);
        }
        .article-container {
            max-width: 800px;
            margin: 0 auto;
            padding: 3rem 2rem;
        }
        @media (max-width: 768px) {
            .article-container {
                padding: 2rem 1rem;
            }
        }
        .article-header {
            margin-bottom: 2rem;
            text-align: left;
        }
        .article-title {
            font-size: 2.2rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-dark);
            margin-bottom: 1.2rem;
        }
        @media (max-width: 768px) {
            .article-title {
                font-size: 1.6rem;
            }
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 1.2rem;
            font-size: 0.88rem;
            color: var(--text-muted);
            padding-bottom: 1.2rem;
            border-bottom: 1px solid var(--border-color);
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .article-meta .meta-item i {
            font-size: 0.8rem;
            opacity: 0.7;
        }
        .article-meta .meta-category {
            display: inline-block;
            background: rgba(74, 144, 217, 0.1);
            color: var(--primary);
            padding: 0.15rem 0.8rem;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 500;
        }

        /* ===== 文章正文 ===== */
        .article-content {
            font-size: 1.05rem;
            line-height: 1.8;
            color: var(--text-dark);
            padding-top: 1.5rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
        }
        .article-content h2 {
            font-size: 1.6rem;
            font-weight: 600;
            margin: 2.5rem 0 1rem 0;
            padding-bottom: 0.4rem;
            border-bottom: 2px solid var(--border-color);
        }
        .article-content h3 {
            font-size: 1.3rem;
            font-weight: 600;
            margin: 2rem 0 0.8rem 0;
        }
        .article-content img {
            margin: 1.5rem auto;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
        }
        .article-content blockquote {
            margin: 1.5rem 0;
            padding: 1rem 1.5rem;
            border-left: 4px solid var(--primary);
            background: var(--bg-light);
            border-radius: 0 var(--radius) var(--radius) 0;
            color: var(--text-muted);
            font-style: italic;
        }
        .article-content ul, .article-content ol {
            margin-bottom: 1.5rem;
        }
        .article-content li {
            margin-bottom: 0.4rem;
        }
        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-content a:hover {
            color: var(--primary-dark);
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.95rem;
        }
        .article-content th, .article-content td {
            padding: 0.75rem 1rem;
            border: 1px solid var(--border-color);
            text-align: left;
        }
        .article-content th {
            background: var(--bg-light);
            font-weight: 600;
        }
        .article-content code {
            background: var(--bg-light);
            padding: 0.15rem 0.5rem;
            border-radius: 4px;
            font-size: 0.9em;
            font-family: 'Courier New', monospace;
        }
        .article-content pre {
            background: var(--secondary);
            color: #e2e8f0;
            padding: 1.2rem 1.5rem;
            border-radius: var(--radius);
            overflow-x: auto;
            margin: 1.5rem 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .article-content pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }

        /* ===== 文章未找到 ===== */
        .article-not-found {
            text-align: center;
            padding: 4rem 2rem;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
        }
        .article-not-found i {
            font-size: 3rem;
            color: var(--text-light);
            margin-bottom: 1.5rem;
            display: block;
        }
        .article-not-found h2 {
            font-size: 1.6rem;
            margin-bottom: 0.8rem;
        }
        .article-not-found p {
            color: var(--text-muted);
            margin-bottom: 1.5rem;
        }
        .article-not-found .btn-back {
            display: inline-block;
            padding: 0.7rem 2rem;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius);
            font-weight: 600;
            transition: var(--transition);
        }
        .article-not-found .btn-back:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ===== 相关推荐 ===== */
        .related-articles {
            background: var(--bg-light);
            padding: 3.5rem 0;
            border-top: 1px solid var(--border-color);
        }
        .related-articles .container {
            max-width: 800px;
        }
        .related-articles h2 {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 2rem;
            text-align: center;
            position: relative;
        }
        .related-articles h2::after {
            content: '';
            display: block;
            width: 50px;
            height: 3px;
            background: var(--primary);
            margin: 0.6rem auto 0;
            border-radius: 2px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        @media (max-width: 768px) {
            .related-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
        }
        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .related-card .card-img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card .card-body {
            padding: 1rem 1.2rem 1.2rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card .card-body h3 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            line-height: 1.4;
            flex: 1;
        }
        .related-card .card-body h3 a {
            color: var(--text-dark);
            text-decoration: none;
        }
        .related-card .card-body h3 a:hover {
            color: var(--primary);
        }
        .related-card .card-body .card-date {
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .related-card .card-img-placeholder {
            height: 160px;
            background: linear-gradient(135deg, var(--primary-light), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 2.2rem;
            font-weight: 700;
        }

        /* ===== 返回按钮 ===== */
        .back-section {
            text-align: center;
            padding: 2.5rem 0;
            background: var(--bg-white);
        }
        .back-section .btn-back-home {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 2.2rem;
            background: var(--bg-light);
            color: var(--text-dark);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            text-decoration: none;
        }
        .back-section .btn-back-home:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--secondary);
            color: rgba(255,255,255,0.85);
            padding: 3.5rem 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 3rem;
            padding-bottom: 2.5rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }
        .footer-col .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 1rem;
        }
        .footer-col .footer-logo .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: rgba(255,255,255,0.15);
            color: #fff;
            border-radius: var(--radius);
            font-weight: 800;
            font-size: 1.1rem;
        }
        .footer-col p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255,255,255,0.65);
            margin-bottom: 0;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 1.2rem;
            position: relative;
            padding-bottom: 0.5rem;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 30px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 0.6rem;
        }
        .footer-col ul li a {
            color: rgba(255,255,255,0.65);
            text-decoration: none;
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-col .contact-item {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.65);
            margin-bottom: 0.6rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .footer-bottom {
            text-align: center;
            padding: 1.5rem 0;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.45);
            margin-top: 0;
        }
        @media (max-width: 520px) {
            .footer-grid {
                gap: 1.5rem;
            }
            .footer-col .footer-logo {
                font-size: 1.1rem;
            }
        }

        /* ===== 响应式辅助 ===== */
        @media (max-width: 1024px) {
            .article-title {
                font-size: 1.9rem;
            }
        }
        @media (max-width: 768px) {
            .article-container {
                padding: 1.5rem 1rem;
            }
            .article-title {
                font-size: 1.5rem;
            }
            .article-meta {
                gap: 0.8rem;
                font-size: 0.82rem;
                flex-wrap: wrap;
            }
            .article-content {
                font-size: 0.98rem;
            }
            .article-content h2 {
                font-size: 1.3rem;
            }
            .article-content h3 {
                font-size: 1.15rem;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .breadcrumb .current {
                max-width: 160px;
            }
        }
        @media (max-width: 520px) {
            .article-title {
                font-size: 1.3rem;
            }
            .article-meta .meta-item {
                font-size: 0.75rem;
            }
            .article-meta .meta-category {
                font-size: 0.7rem;
            }
            .back-section .btn-back-home {
                padding: 0.6rem 1.6rem;
                font-size: 0.85rem;
            }
            .related-card .card-img,
            .related-card .card-img-placeholder {
                height: 130px;
            }
        }