/* 活动列表特定样式 */
        .list-container {
            background: #f8f9fa;
            min-height: 100vh;
        }
        
        /* 搜索栏 */
        .search-section {
            background: white;
            padding: 15px;
            border-bottom: 1px solid #eee;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .search-bar {
            display: flex;
            gap: 10px;
            margin-bottom: 15px;
        }
        
        .search-input {
            flex: 1;
            padding: 12px 15px;
            border: 1px solid #e0e0e0;
            border-radius: 25px;
            font-size: 1rem;
            background: #f8f9fa;
            outline: none;
            transition: border-color 0.3s;
        }
        
        .search-input:focus {
            border-color: #667eea;
            background: white;
        }
        
        .search-btn {
            background: #667eea;
            color: white;
            border: none;
            border-radius: 25px;
            padding: 0 20px;
            font-size: 0.9rem;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        
        .search-btn:hover {
            background: #5a6fd8;
        }
        
        /* 筛选区域 */
        .filter-section {
            display: flex;
            gap: 10px;
            flex: 1;
            flex-wrap: wrap;
        }
        
        .filter-select {
            flex: 1;
            min-width: 120px;
            padding: 8px 12px;
            border: 1px solid #e0e0e0;
            border-radius: 8px;
            background: white;
            font-size: 0.9rem;
            outline: none;
        }
        
        .view-toggle {
            display: flex;
            gap: 5px;
            background: #f8f9fa;
            border-radius: 8px;
            padding: 4px;
        }
        
        .view-btn {
            padding: 6px 12px;
            border: none;
            background: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 1rem;
            transition: all 0.3s;
        }
        
        .view-btn.active {
            background: white;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
        }
        
        /* 活动列表 */
        .activity-list, .activity-grid {
            padding: 15px;
        }
        
        /* 列表视图 */
        .activity-item-list {
            background: white;
            border-radius: 12px;
            margin-bottom: 15px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s;
            overflow: hidden;
        }
        
        .activity-item-list:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }
        
        .activity-header {
            padding: 15px 15px 10px;
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            gap: 10px;
        }
        
        .activity-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: #333;
            line-height: 1.4;
            margin-bottom: 5px;
        }
        
        .activity-status {
            font-size: 0.75rem;
            padding: 2px 8px;
            border-radius: 10px;
            font-weight: 500;
        }
        
        .status-upcoming { background: #e7f3ff; color: #1890ff; }
        .status-ongoing { background: #f6ffed; color: #52c41a; }
        .status-enrolled { background: #f0f4ff; color: #667eea; }
        .status-full { background: #fff2f0; color: #ff4d4f; }
        
        .activity-meta {
            padding: 0 15px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            margin-bottom: 15px;
        }
        
        .meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
            color: #666;
            font-size: 0.9rem;
        }
        
        .activity-footer {
            padding: 15px;
            border-top: 1px solid #f0f0f0;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .activity-count {
            color: #666;
            font-size: 0.9rem;
        }
        
        .activity-actions {
            display: flex;
            gap: 8px;
        }
        
        .action-btn {
            padding: 6px 12px;
            border: 1px solid #e0e0e0;
            border-radius: 6px;
            background: white;
            font-size: 0.8rem;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .action-btn.primary {
            background: #667eea;
            color: white;
            border-color: #667eea;
        }
        
        .action-btn.success {
            background: #52c41a;
            color: white;
            border-color: #52c41a;
        }
        
        .action-btn.followed {
            background: #ff4d4f;
            color: white;
            border-color: #ff4d4f;
        }
        
        .action-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }
        
        .action-btn.loading {
            opacity: 0.7;
            cursor: wait;
        }
        
        /* 网格视图 */
        .activity-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 15px;
        }
        
        .activity-item-grid {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .activity-item-grid:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }
        
        .activity-image {
            height: 140px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 2rem;
        }
        
        .activity-content {
            padding: 15px;
        }
        
        .grid-title {
            font-size: 1rem;
            font-weight: 600;
            color: #333;
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        
        .grid-meta {
            display: flex;
            flex-direction: column;
            gap: 4px;
            margin-bottom: 12px;
            font-size: 0.85rem;
            color: #666;
        }
        
        .grid-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .grid-count {
            color: #666;
            font-size: 0.85rem;
        }
        
        .grid-actions {
            display: flex;
            gap: 5px;
        }
        
        .grid-btn {
            width: 32px;
            height: 32px;
            border: 1px solid #e0e0e0;
            border-radius: 6px;
            background: white;
            cursor: pointer;
            font-size: 0.9rem;
            transition: all 0.3s;
        }
        
        .grid-btn.primary {
            background: #667eea;
            color: white;
            border-color: #667eea;
        }
        
        .grid-btn.success {
            background: #52c41a;
            color: white;
            border-color: #52c41a;
        }
        
        .grid-btn.followed {
            background: #ff4d4f;
            color: white;
            border-color: #ff4d4f;
        }
        
        .grid-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }
        
        /* 空状态 */
        .empty-state {
            text-align: center;
            padding: 60px 20px;
            color: #666;
        }
        
        .empty-icon {
            font-size: 3rem;
            margin-bottom: 15px;
            opacity: 0.5;
        }
        
        .empty-text {
            margin-bottom: 20px;
            font-size: 1rem;
        }
        
        .empty-action {
            color: #667eea;
            text-decoration: none;
            font-weight: 500;
            padding: 10px 20px;
            border: 1px solid #667eea;
            border-radius: 20px;
            display: inline-block;
            transition: all 0.3s;
        }
        
        .empty-action:hover {
            background: #667eea;
            color: white;
        }
        
        /* 分页 */
        .pagination {
            display: flex;
            justify-content: center;
            padding: 20px 15px;
            gap: 8px;
            flex-wrap: wrap;
        }
        
        .page-btn {
            padding: 8px 12px;
            border: 1px solid #e0e0e0;
            border-radius: 8px;
            background: white;
            color: #333;
            text-decoration: none;
            font-size: 0.9rem;
            transition: all 0.3s;
        }
        
        .page-btn:hover {
            border-color: #667eea;
            color: #667eea;
        }
        
        .page-btn.active {
            background: #667eea;
            color: white;
            border-color: #667eea;
        }
        
        /* 模态框 */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 1000;
            align-items: center;
            justify-content: center;
        }
        
        .modal-content {
            background: white;
            border-radius: 12px;
            width: 90%;
            max-width: 400px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }
        
        .modal-header {
            padding: 20px;
            border-bottom: 1px solid #eee;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .modal-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: #333;
        }
        
        .modal-close {
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: #999;
        }
        
        .modal-body {
            padding: 20px;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .filter-section {
                flex-direction: column;
            }
            
            .filter-select {
                min-width: auto;
            }
            
            .activity-grid {
                grid-template-columns: 1fr;
            }
            
            .activity-header {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .activity-actions {
                width: 100%;
                justify-content: space-between;
                margin-top: 10px;
            }
            
            .action-btn {
                flex: 1;
                text-align: center;
            }
        }
        
        /* 加载动画 */
        @keyframes pulse {
            0% { opacity: 1; }
            50% { opacity: 0.5; }
            100% { opacity: 1; }
        }
        
        .loading {
            animation: pulse 1.5s ease-in-out infinite;
        }