body { background-color: #f8f9fa; }
        
        /* Hero 搜索区背景 */
        .hero-section {
            background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
            color: white;
            padding: 4rem 0 5rem;
            margin-bottom: 3rem;
            border-radius: 0 0 50% 50% / 4%;
        }
        
        /* 搜索框美化 */
        .hero-search-input {
            height: 3.5rem;
            font-size: 1.1rem;
            border-radius: 2rem 0 0 2rem;
            border: none;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }
        .hero-search-btn {
            border-radius: 0 2rem 2rem 0;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
            font-weight: bold;
            background-color: #ffc107; 
            border: none;
            color: #000;
        }
        .hero-search-btn:hover { background-color: #ffca2c; }

        /* 快速链接样式 */
        .hero-quick-links a {
            color: rgba(255,255,255,0.9);
            text-decoration: none;
            border-bottom: 1px solid rgba(255,255,255,0.4);
            transition: all 0.2s;
            margin-right: 1rem;
            display: inline-block;
            margin-bottom: 0.5rem;
        }
        .hero-quick-links a:hover {
            color: #fff;
            border-bottom-color: #fff;
        }
        .hero-badge {
            font-size: 0.75rem;
            padding: 0.15rem 0.4rem;
            border-radius: 4px;
            margin-right: 4px;
            vertical-align: text-top;
        }

        /* 分类标题 */
        .category-header {
            display: flex;
            align-items: center;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e9ecef;
        }
        .category-icon {
            font-size: 1.5rem;
            margin-right: 0.75rem;
            color: #0d6efd;
        }

        /* 推荐卡片样式 */
        .calc-home-card {
            background: #fff;
            border: 1px solid #dee2e6;
            border-radius: 0.5rem;
            padding: 1.25rem;
            height: 100%;
            transition: transform 0.2s, box-shadow 0.2s;
            text-decoration: none;
            color: #212529;
            display: flex;
            align-items: center; /* 垂直居中 */
            justify-content: center; /* 水平居中 */
            text-align: center;
            font-weight: 600;
        }
        .calc-home-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            border-color: #0d6efd;
            color: #0d6efd;
        }

        /* =========================================
           列表划过特效 (Hover Effect) - 这里的样式控制下面分类列表
           ========================================= */
        .calc-list-item {
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            background-color: #fff;
        }
        .calc-list-item:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 15px rgba(13, 110, 253, 0.12);
            border-color: #0d6efd !important;
            color: #0d6efd !important;
            z-index: 5;
        }
        .calc-list-item:hover i {
            color: #0d6efd !important;
            transform: scale(1.1);
            transition: transform 0.2s;
        }

        /* 侧边栏样式 */
        .sidebar-box {
            background: #fff;
            border: 1px solid #dee2e6;
            border-radius: 0.5rem;
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
        .sidebar-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #f8f9fa;
        }
        .sidebar-link {
            display: block;
            padding: 0.5rem 0;
            color: #495057;
            text-decoration: none;
            border-bottom: 1px dashed #e9ecef;
            transition: color 0.2s;
        }
        .sidebar-link:hover { color: #0d6efd; padding-left: 5px; }
        .sidebar-link:last-child { border-bottom: none; }

        /* SEO 文本区 */
        .seo-content-area {
            background: #fff;
            padding: 3rem 2rem;
            border-radius: 1rem;
            margin-top: 3rem;
            border: 1px solid #e9ecef;
        }