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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background: #f0f2f5;
            color: #333;
            line-height: 1.6;
        }

        /* 顶部导航 */
        .header {
            background: #fff;
            box-shadow: 0 1px 3px rgba(0,0,0,0.08);
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 24px;
            font-weight: 800;
            color: #1a1a1a;
            text-decoration: none;
        }

        .logo svg {
            width: 40px;
            height: 40px;
        }

        .nav-menu {
            display: flex;
            gap: 28px;
            list-style: none;
        }

        .nav-menu a {
            text-decoration: none;
            color: #666;
            font-size: 14px;
            transition: color 0.2s;
        }

        .nav-menu a:hover, .nav-menu a.active {
            color: #1890ff;
        }

        /* 主容器 */
        .main-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        /* 页面标题 */
        .page-header {
            background: linear-gradient(135deg, #1890ff 0%, #36cfc9 100%);
            border-radius: 8px;
            padding: 40px;
            margin-bottom: 24px;
            color: white;
            text-align: center;
        }

        .page-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .page-subtitle {
            opacity: 0.9;
            font-size: 14px;
        }

        /* 工具分类 */
        .tools-section {
            background: #fff;
            border-radius: 8px;
            margin-bottom: 16px;
        }

        .section-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 20px;
        }

        .section-icon {
            width: 36px;
            height: 36px;
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
        }

        .section-title {
            font-size: 16px;
            font-weight: 700;
            color: #1f1f1f;
        }

        .section-desc {
            font-size: 12px;
            color: #999;
            margin-top: 2px;
        }

        /* 配色 */
        .bg-blue { background: #e6f7ff; color: #1890ff; }
        .bg-red { background: #fff1f0; color: #ff4d4f; }
        .bg-purple { background: #f9f0ff; color: #722ed1; }
        .bg-green { background: #f6ffed; color: #52c41a; }

        /* 工具网格 */
        .tools-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 16px;
        }

        .tool-item {
            padding: 16px;
            border: 1px solid #f0f0f0;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.2s;
            text-decoration: none;
        }

        .tool-item:hover {
            border-color: #1890ff;
            box-shadow: 0 2px 8px rgba(24,144,255,0.1);
        }

        .tool-name {
            font-size: 14px;
            font-weight: 600;
            color: #262626;
            margin-bottom: 4px;
        }

        .tool-desc {
            font-size: 12px;
            color: #999;
            line-height: 1.5;
        }

        /* 页脚 */
        .footer {
            background: #fff;
            border-top: 1px solid #e8e8e8;
            padding: 24px;
            text-align: center;
            margin-top: 40px;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 24px;
            margin-bottom: 12px;
        }

        .footer-links a {
            color: #666;
            text-decoration: none;
            font-size: 13px;
        }

        .footer-copyright {
            font-size: 12px;
            color: #999;
        }

        @media (max-width: 768px) {
            .nav-menu { display: none; }
            .tools-grid { grid-template-columns: repeat(2, 1fr); }
        }