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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Helvetica, Arial, sans-serif;
            background: #f5f7fa;
            color: #1f2d3d;
            line-height: 1.5;
        }

        /* custom css */
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            transition: opacity 0.2s;
            }
            .logo:hover {
            opacity: 0.85;
            }
            .logo-img {
            height: 36px;
            width: auto;
            display: block;
            }
            .logo-text {
            font-weight: 650;
            font-size: 1.6rem;
            letter-spacing: -0.02em;
            color: #0f172a;
            line-height: 1;
            }
            .logo-text i {
            font-size: 1.6rem;
            color: #176ab4;
            margin-right: 4px;
            }
        .manual-container {
            display: flex;
            min-height: 100vh;
            background: #fff;
        }

        /* 左侧导航栏 */
        .sidebar {
            width: 280px;
            background: rgba(249, 250, 252, 0.98);
            backdrop-filter: blur(2px);
            border-right: 1px solid #e4e7ed;
            position: sticky;
            top: 0;
            height: 100vh;
            overflow-y: auto;
            flex-shrink: 0;
            transition: transform 0.35s cubic-bezier(0.2, 0.9, 0.4, 1.1);
            z-index: 100;
            box-shadow: 2px 0 12px rgba(0,0,0,0.02);
        }

        @media (max-width: 768px) {
            .sidebar {
                position: fixed;
                left: 0;
                top: 0;
                transform: translateX(-100%);
                z-index: 150;
                box-shadow: 4px 0 20px rgba(0,0,0,0.12);
            }
            .sidebar.open {
                transform: translateX(0);
            }
        }

        /* 移动端右上角菜单按钮 */
        .sidebar-mobile-toggle {
            display: none;
            position: fixed;
            top: 16px;
            right: 16px;
            background: #176ab4;
            color: white;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            z-index: 200;
            box-shadow: 0 4px 12px rgba(23, 106, 180, 0.35);
            font-size: 22px;
            transition: all 0.25s ease;
        }
        .sidebar-mobile-toggle:hover {
            transform: scale(1.05);
            background: #0f5a9e;
            box-shadow: 0 6px 16px rgba(23, 106, 180, 0.5);
        }
        .sidebar-mobile-toggle:active {
            transform: scale(0.96);
        }

        @media (max-width: 768px) {
            .sidebar-mobile-toggle {
                display: flex;
            }
        }

        /* 菜单项点击波纹 */
        .nav-link {
            position: relative;
            overflow: hidden;
            transition: background 0.2s, color 0.2s, border-left 0.2s;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: rgba(23, 106, 180, 0.15);
            transform: translate(-50%, -50%);
            transition: width 0.4s, height 0.4s;
        }
        .nav-link:active::after {
            width: 120%;
            height: 120%;
        }

        .sidebar-header {
            padding: 24px 20px 16px 20px;
            border-bottom: 1px solid #e4e7ed;
        }
        .sidebar-header h2 {
            font-size: 1.3rem;
            font-weight: 600;
            color: #176ab4;
        }
        .sidebar-header p {
            font-size: 0.75rem;
            color: #6c7a8a;
            margin-top: 6px;
        }
        .nav-list {
            list-style: none;
            padding: 16px 0 32px 0;
        }
        .nav-item {
            margin: 0;
            padding: 0;
        }
        .nav-link {
            display: block;
            padding: 12px 20px;
            color: #3a4a5c;
            text-decoration: none;
            font-size: 0.9rem;
            border-left: 3px solid transparent;
        }
        .nav-link i {
            margin-right: 10px;
            width: 20px;
            text-align: center;
        }
        .nav-link:hover {
            background-color: #eef2f6;
            color: #176ab4;
        }
        .nav-link.active {
            background-color: #eef2f6;
            border-left-color: #176ab4;
            color: #176ab4;
            font-weight: 500;
        }

        /* 右侧内容区 */
        .content-area {
            flex: 1;
            padding: 32px 40px 80px 40px;
            max-width: calc(100% - 280px);
            overflow-x: auto;
        }
        @media (max-width: 768px) {
            .content-area {
                max-width: 100%;
                padding: 24px 20px 80px 20px;
            }
        }

        .content-section {
            display: none;
            animation: fadeIn 0.3s ease;
        }
        .content-section.active-section {
            display: block;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(6px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* 内容样式 */
        .content-section h1 {
            font-size: 1.8rem;
            font-weight: 600;
            margin-bottom: 24px;
            padding-bottom: 12px;
            border-bottom: 2px solid #e4e7ed;
            color: #1f2d3d;
        }
        .content-section h2 {
            font-size: 1.4rem;
            font-weight: 600;
            margin: 28px 0 16px 0;
            color: #176ab4;
        }
        .content-section h3 {
            font-size: 1.2rem;
            font-weight: 500;
            margin: 20px 0 12px 0;
            color: #2c3e50;
        }
        .content-section p {
            margin-bottom: 16px;
            color: #3a4a5c;
            line-height: 1.7;
        }
        .card-box {
            background: #f8fafc;
            border-radius: 16px;
            padding: 20px;
            margin: 20px 0;
            border: 1px solid #eef2f6;
            box-shadow: 0 2px 6px rgba(0,0,0,0.02);
        }
        .notice {
            background: #fff6e5;
            border-left: 4px solid #f5a623;
            padding: 16px 20px;
            border-radius: 12px;
            margin: 20px 0;
        }
        .table-wrapper {
            overflow-x: auto;
            margin: 20px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        }
        th, td {
            border: 1px solid #e4e7ed;
            padding: 12px 16px;
            text-align: left;
        }
        th {
            background: #f1f5f9;
            font-weight: 600;
        }

        /* 特色卡片网格 */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
            margin: 24px 0;
        }
        .service-card {
            background: white;
            border-radius: 20px;
            padding: 20px;
            border: 1px solid #eef2f6;
            transition: 0.2s;
        }
        .service-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.05);
            border-color: #176ab4;
        }
        .service-icon {
            font-size: 32px;
            color: #176ab4;
            margin-bottom: 12px;
        }
        .service-title {
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 8px;
        }

        .sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: #f1f1f1;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 4px;
        }
        .table-container {
            max-width: 1000px;
            margin: 0 auto;
            background: white;
            border-radius: 24px;
            padding: 2rem;
            box-shadow: 0 4px 20px rgba(0,0,0,0.05);
        }
        table {
            width: 100%;
            border-collapse: collapse;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        }
        th {
            background: #176ab4;
            color: white;
            padding: 14px 16px;
            text-align: left;
            font-weight: 600;
        }
        td {
            padding: 12px 16px;
            border-bottom: 1px solid #eef2f6;
            color: #1f2d3d;
        }
        tr:hover {
            background: #f8fafc;
        }
        .note {
            color: #64748b;
            font-size: 0.85rem;
        }
        @media (max-width: 640px) {
            body { padding: 1rem; }
            .table-container { padding: 1rem; }
            th, td { padding: 10px 12px; }
        }