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

    html {
        scroll-behavior: smooth;
    }

    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        color: #333;
        line-height: 1.6;
        background-color: #f8f9fa;
    }

    /* ===== 导航栏 ===== */
    .bh040-header {
        background: white;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
        position: sticky;
        top: 0;
        z-index: 1000;
    }

    .bh040-nav {
        display: flex;
        align-items: center;
        justify-content: space-between;
        max-width: 1400px;
        margin: 0 auto;
        padding: 0 40px;
        height: 70px;
    }

    .bh040-logo img {
        height: 40px;
        width: auto;
    }

    .bh040-nav-menu {
        display: flex;
        gap: 40px;
        align-items: center;
    }

    .bh040-nav-menu a {
        text-decoration: none;
        color: #333;
        font-weight: 500;
        font-size: 15px;
        transition: color 0.3s ease;
        position: relative;
    }

    .bh040-nav-menu a:hover {
        color: #0088cc;
    }

    .bh040-nav-menu a.active {
        color: #0088cc;
    }

    .bh040-nav-menu a.active::after {
        content: '';
        position: absolute;
        bottom: -8px;
        left: 0;
        right: 0;
        height: 3px;
        background: #0088cc;
        border-radius: 2px;
    }

    .bh040-menu-toggle {
        display: none;
        flex-direction: column;
        background: none;
        border: none;
        cursor: pointer;
        padding: 5px;
        gap: 5px;
    }

    .bh040-menu-toggle span {
        width: 25px;
        height: 3px;
        background: #333;
        border-radius: 2px;
        transition: all 0.3s ease;
    }

    .bh040-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translateY(10px);
    }

    .bh040-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .bh040-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translateY(-10px);
    }

    .bh040-nav-overlay {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .bh040-nav-overlay.active {
        display: block;
    }

    /* ===== 面包屑导航 ===== */
    .bh040-breadcrumb-section {
        background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
        padding: 30px 40px;
        border-bottom: 1px solid #e0e0e0;
    }

    .bh040-breadcrumb-container {
        max-width: 1400px;
        margin: 0 auto;
    }

    .bh040-breadcrumb-nav {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 14px;
        margin-bottom: 20px;
    }

    .bh040-breadcrumb-nav a {
        color: #0088cc;
        text-decoration: none;
        transition: color 0.3s ease;
    }

    .bh040-breadcrumb-nav a:hover {
        color: #0073b1;
    }

    .bh040-breadcrumb-nav span {
        color: #999;
    }

    .bh040-breadcrumb-nav .active {
        color: #333;
        font-weight: 600;
    }

    .bh040-page-title {
        font-size: 36px;
        font-weight: 700;
        color: #1a1a1a;
        margin-bottom: 12px;
    }

    .bh040-page-subtitle {
        font-size: 16px;
        color: #666;
        line-height: 1.6;
    }

    /* ===== 主要内容 ===== */
    .bh040-main-container {
        max-width: 1400px;
        margin: 0 auto;
        padding: 60px 40px;
    }

    .bh040-content-wrapper {
        display: grid;
        grid-template-columns: 250px 1fr;
        gap: 40px;
    }

    /* ===== 侧边菜单 ===== */
    .bh040-sidebar-menu {
        position: sticky;
        top: 100px;
        height: fit-content;
    }

    .bh040-sidebar-menu h3 {
        font-size: 16px;
        font-weight: 700;
        color: #1a1a1a;
        margin-bottom: 20px;
        padding-bottom: 12px;
        border-bottom: 2px solid #0088cc;
    }

    .bh040-sidebar-menu ul {
        list-style: none;
    }

    .bh040-sidebar-menu li {
        margin-bottom: 12px;
    }

    .bh040-sidebar-menu a {
        display: block;
        color: #666;
        text-decoration: none;
        font-size: 14px;
        padding: 8px 12px;
        border-left: 3px solid transparent;
        transition: all 0.3s ease;
    }

    .bh040-sidebar-menu a:hover {
        color: #0088cc;
        background: #f0f4f8;
        border-left-color: #0088cc;
    }

    .bh040-sidebar-menu a.active {
        color: #0088cc;
        background: #f0f4f8;
        border-left-color: #0088cc;
        font-weight: 600;
    }

    /* ===== 教程内容 ===== */
    .bh040-guide-content {
        background: white;
        border-radius: 12px;
        padding: 40px;
    }

    .bh040-section {
        margin-bottom: 50px;
    }

    .bh040-section:last-child {
        margin-bottom: 0;
    }

    .bh040-section h2 {
        font-size: 28px;
        font-weight: 700;
        color: #1a1a1a;
        margin-bottom: 20px;
        padding-bottom: 15px;
        border-bottom: 3px solid #0088cc;
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .bh040-section-icon {
        font-size: 32px;
    }

    .bh040-section p {
        color: #555;
        margin-bottom: 16px;
        line-height: 1.8;
    }

    .bh040-section ul, .bh040-section ol {
        margin-left: 20px;
        margin-bottom: 16px;
    }

    .bh040-section li {
        margin-bottom: 12px;
        color: #555;
        line-height: 1.8;
    }

    .bh040-section strong {
        color: #1a1a1a;
        font-weight: 600;
    }

    /* ===== 步骤卡片 ===== */
    .bh040-steps-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 24px;
        margin-bottom: 30px;
    }

    .bh040-step-card {
        background: linear-gradient(135deg, #f8f9fa 0%, #f0f4f8 100%);
        border-radius: 12px;
        padding: 30px;
        border: 1px solid #e8ecf1;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
    }

    .bh040-step-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, #0088cc, #00a8e8);
    }

    .bh040-step-card:hover {
        transform: translateY(-4px);
        box-shadow: 0 8px 24px rgba(0, 136, 204, 0.12);
    }

    .bh040-step-number {
        font-size: 48px;
        font-weight: 700;
        color: #0088cc;
        margin-bottom: 12px;
    }

    .bh040-step-card h4 {
        font-size: 18px;
        font-weight: 700;
        color: #1a1a1a;
        margin-bottom: 12px;
    }

    .bh040-step-card p {
        font-size: 14px;
        color: #666;
        line-height: 1.6;
    }

    /* ===== 功能说明卡片 ===== */
    .bh040-feature-cards {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 24px;
        margin-bottom: 30px;
    }

    .bh040-feature-item {
        background: white;
        border: 2px solid #e8ecf1;
        border-radius: 12px;
        padding: 28px;
        transition: all 0.3s ease;
    }

    .bh040-feature-item:hover {
        border-color: #0088cc;
        box-shadow: 0 8px 20px rgba(0, 136, 204, 0.1);
    }

    .bh040-feature-icon {
        font-size: 40px;
        margin-bottom: 16px;
        display: inline-block;
    }

    .bh040-feature-item h4 {
        font-size: 18px;
        font-weight: 700;
        color: #1a1a1a;
        margin-bottom: 12px;
    }

    .bh040-feature-item p {
        font-size: 14px;
        color: #666;
        line-height: 1.7;
    }

    /* ===== 提示框 ===== */
    .bh040-tip-box {
        background: #e8f4f8;
        border-left: 4px solid #0088cc;
        border-radius: 8px;
        padding: 20px;
        margin: 24px 0;
    }

    .bh040-tip-box strong {
        color: #0088cc;
        display: block;
        margin-bottom: 8px;
    }

    .bh040-tip-box p {
        color: #0066aa;
        margin: 0;
        font-size: 14px;
    }

    .bh040-warning-box {
        background: #fff3cd;
        border-left: 4px solid #ffc107;
        border-radius: 8px;
        padding: 20px;
        margin: 24px 0;
    }

    .bh040-warning-box strong {
        color: #ff9800;
        display: block;
        margin-bottom: 8px;
    }

    .bh040-warning-box p {
        color: #d97706;
        margin: 0;
        font-size: 14px;
    }

    /* ===== 按钮 ===== */
    .bh040-btn {
        display: inline-block;
        padding: 12px 28px;
        background: #0088cc;
        color: white;
        text-decoration: none;
        border-radius: 6px;
        font-weight: 600;
        font-size: 15px;
        transition: all 0.3s ease;
        border: none;
        cursor: pointer;
    }

    .bh040-btn:hover {
        background: #0073b1;
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(0, 136, 204, 0.3);
    }

    .bh040-btn-outline {
        background: white;
        color: #0088cc;
        border: 2px solid #0088cc;
    }

    .bh040-btn-outline:hover {
        background: #f0f4f8;
    }

    /* ===== 图片区域 ===== */
    .bh040-image-block {
        margin: 30px 0;
        border-radius: 12px;
        overflow: hidden;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    }

    .bh040-image-block img {
        width: 100%;
        height: auto;
        display: block;
    }

    /* ===== 表格 ===== */
    .bh040-table-wrapper {
        overflow-x: auto;
        margin: 24px 0;
        border-radius: 8px;
        border: 1px solid #e8ecf1;
    }

    .bh040-comparison-table {
        width: 100%;
        border-collapse: collapse;
        background: white;
    }

    .bh040-comparison-table th {
        background: #f5f7fa;
        padding: 16px;
        text-align: left;
        font-weight: 700;
        color: #1a1a1a;
        border-bottom: 2px solid #e8ecf1;
    }

    .bh040-comparison-table td {
        padding: 16px;
        border-bottom: 1px solid #e8ecf1;
        color: #555;
    }

    .bh040-comparison-table tr:last-child td {
        border-bottom: none;
    }

    .bh040-comparison-table tbody tr:hover {
        background: #f8f9fa;
    }

    /* ===== 快速导航 ===== */
    .bh040-quick-nav {
        background: linear-gradient(135deg, #f8f9fa 0%, #e8ecf1 100%);
        border-radius: 12px;
        padding: 24px;
        margin: 30px 0;
        border: 1px solid #e0e0e0;
    }

    .bh040-quick-nav h4 {
        font-size: 16px;
        font-weight: 700;
        color: #1a1a1a;
        margin-bottom: 16px;
    }

    .bh040-quick-nav-items {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 12px;
    }

    .bh040-quick-nav-item {
        background: white;
        padding: 12px 16px;
        border-radius: 6px;
        text-align: center;
        border: 1px solid #e8ecf1;
        transition: all 0.3s ease;
        cursor: pointer;
    }

    .bh040-quick-nav-item:hover {
        border-color: #0088cc;
        color: #0088cc;
        transform: translateY(-2px);
    }

    /* ===== 页脚 ===== */
    .bh040-footer {
        background: #1a1a1a;
        color: #ccc;
        padding: 60px 40px 30px;
        margin-top: 80px;
    }

    .bh040-footer-container {
        max-width: 1400px;
        margin: 0 auto;
    }

    .bh040-footer-content {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 40px;
        margin-bottom: 40px;
    }

    .bh040-footer-section h4 {
        font-size: 16px;
        font-weight: 700;
        color: white;
        margin-bottom: 20px;
    }

    .bh040-footer-section ul {
        list-style: none;
    }

    .bh040-footer-section li {
        margin-bottom: 12px;
    }

    .bh040-footer-section a {
        color: #ccc;
        text-decoration: none;
        font-size: 14px;
        transition: color 0.3s ease;
    }

    .bh040-footer-section a:hover {
        color: #0088cc;
    }

    .bh040-footer-brand {
        font-size: 18px;
        font-weight: 700;
        color: white;
        margin-bottom: 12px;
    }

    .bh040-footer-desc {
        color: #999;
        font-size: 14px;
        line-height: 1.6;
        margin-bottom: 20px;
    }

    .bh040-footer-bottom {
        padding-top: 30px;
        border-top: 1px solid #333;
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 20px;
        font-size: 13px;
        color: #999;
    }

    .bh040-footer-links {
        display: flex;
        gap: 24px;
    }

    .bh040-footer-links a {
        color: #999;
        text-decoration: none;
        transition: color 0.3s ease;
    }

    .bh040-footer-links a:hover {
        color: #0088cc;
    }

    /* ===== 响应式设计 ===== */
    @media (max-width: 1024px) {
        .bh040-nav {
            padding: 0 30px;
        }

        .bh040-main-container {
            padding: 40px 30px;
        }

        .bh040-content-wrapper {
            grid-template-columns: 1fr;
            gap: 30px;
        }

        .bh040-sidebar-menu {
            position: static;
        }

        .bh040-guide-content {
            padding: 30px;
        }
    }

    @media (max-width: 768px) {
        .bh040-nav {
            padding: 0 20px;
            height: 60px;
        }

        .bh040-nav-menu {
            display: none;
            position: absolute;
            top: 60px;
            left: 0;
            right: 0;
            flex-direction: column;
            background: white;
            padding: 20px;
            gap: 20px;
            border-bottom: 1px solid #e0e0e0;
        }

        .bh040-nav-menu.active {
            display: flex;
        }

        .bh040-menu-toggle {
            display: flex;
        }

        .bh040-breadcrumb-section {
            padding: 20px;
        }

        .bh040-page-title {
            font-size: 24px;
        }

        .bh040-page-subtitle {
            font-size: 14px;
        }

        .bh040-main-container {
            padding: 20px;
        }

        .bh040-guide-content {
            padding: 20px;
        }

        .bh040-section h2 {
            font-size: 22px;
        }

        .bh040-steps-grid {
            grid-template-columns: 1fr;
        }

        .bh040-feature-cards {
            grid-template-columns: 1fr;
        }

        .bh040-sidebar-menu {
            display: none;
        }

        .bh040-footer-content {
            grid-template-columns: 1fr;
            gap: 24px;
        }

        .bh040-footer-bottom {
            flex-direction: column;
            align-items: flex-start;
        }

        .bh040-footer-links {
            flex-direction: column;
            gap: 12px;
        }
    }

    @media (max-width: 480px) {
        .bh040-page-title {
            font-size: 20px;
        }

        .bh040-section h2 {
            font-size: 18px;
        }

        .bh040-steps-grid {
            gap: 16px;
        }

        .bh040-step-card {
            padding: 20px;
        }

        .bh040-feature-cards {
            gap: 16px;
        }

        .bh040-feature-item {
            padding: 20px;
        }

        .bh040-quick-nav-items {
            grid-template-columns: repeat(2, 1fr);
        }

        .bh040-footer {
            padding: 40px 20px 20px;
        }
    }