@CHARSET "UTF-8";
      
       .select-container {
           position: relative;
           margin-bottom: 25px;
       }
       
       .select-header {
           display: flex;
           align-items: center;
           justify-content: space-between;
           padding: 15px;
           border: 2px solid #ddd;
           border-radius: 8px;
           background: #f9f9f9;
       }
       
       .placeholder {
           color: #999;
           font-size: 16px;
       }
       
       .selected-count {
           background: #3498db;
           color: white;
           padding: 3px 10px;
           border-radius: 20px;
           font-size: 14px;
           font-weight: bold;
       }
       
       .options-container {
           background: white;
           border: 2px solid #ddd;
           border-radius: 8px;
           margin-top: 5px;
           max-height: 300px;
           overflow-y: auto;
           z-index: 100;
           box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
       }
       
       .search-box {
           padding: 12px;
           border-bottom: 1px solid #eee;
       }
       
       .search-box input {
           width: 100%;
           padding: 10px;
           border: 1px solid #ddd;
           border-radius: 4px;
           font-size: 16px;
       }
       
       .option {
           display: flex;
           align-items: center;
           padding: 12px 15px;
           cursor: pointer;
           transition: background 0.2s;
       }
       
       .option:hover {
           background: #f0f7ff;
       }
       
       .option input[type="checkbox"] {
           margin-right: 12px;
           width: 18px;
           height: 18px;
           cursor: pointer;
       }
       
       .option.disabled {
           opacity: 0.5;
           cursor: not-allowed;
       }
       
       .option.disabled:hover {
           background: white;
       }
       
       .max-selection {
           color: #e74c3c;
           font-weight: bold;
           margin-top: 10px;
           display: none;
       }
       
       .max-selection.show {
           display: block;
       }
       
       .instructions {
           background: #e8f4fc;
           padding: 15px;
           border-radius: 8px;
           margin-top: 25px;
           font-size: 14px;
           color: #2c3e50;
       }
       
       .instructions h3 {
           margin-top: 0;
           color: #2980b9;
       }
       
       .instructions ul {
           padding-left: 20px;
           margin-bottom: 0;
       }
       
       .instructions li {
           margin-bottom: 8px;
       }
       
       /* 隐藏原生select元素 */
       #sourceSelect {
           display: none;
       }