.ai-dialog-overlay {
    display: none;
    position: absolute;
    left: 10vw;
    top: 10vh;
    width: 80vw;
    height: 80vh;
    background: transparent;
    z-index: 20000;
    align-items: center;
    justify-content: center;
}
    .ai-dialog-overlay.show { display: block; }
    
    .ai-dialog {
      width: 100%; 
      height: 100%; 
      background: var(--uu-f);
      border-radius: 16px; 
      box-shadow: 0 0 10px 1px rgba(0, 0, 0, 0.2);
      display: flex; flex-direction: column; overflow: hidden;
    }
    
    .ai-dialog-header {
      display: flex; justify-content: space-between; align-items: center;
      padding: 10px 18px; border-bottom: 1px solid var(--uu-f0); background: var(--uu-fa);
    }
    .ai-dialog-title { font-size: 18px; font-weight: 600; color: var(--uu-5); }
    .ai-dialog-close {
      display: flex; align-items: center; justify-content: center; flex-shrink: 0;
      width: 32px; height: 32px; border: none; background: var(--uu-f3);
      border-radius: 8px; color: #9ca3af; font-size: 22px; cursor: pointer;
    }
    .ai-dialog-close:hover { background: var(--uu-e5); color: var(--uu-4); }
    
    .ai-dialog-body { flex: 1; display: flex; overflow: hidden; }
    
    
    .ai-history-sidebar {
      width: 260px;
      min-width: 260px;
      max-width: 260px;
      flex-shrink: 0;
      border-right: 1px solid var(--uu-f0);
      display: flex;
      flex-direction: column;
      background: var(--uu-fa);
    }
    .sidebar-section {
      display: flex;
      flex-direction: column;
      min-height: 0;
    }
    .history-section {
      flex: 3;
    }
    .questions-section {
      flex: 2;
      border-top: 1px solid var(--uu-f0);
    }
    .ai-questions-list {
      flex: 1;
      overflow-y: auto;
      padding: 8px;
    }
    .question-item {
      display: flex;
      align-items: center;
      padding: 6px 12px;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.2s;
      margin-bottom: 2px;
    }
    .question-item:hover {
      background: var(--uu-f2);
    }
    .question-item:hover .q-text {
      color: var(--uu-primary);
    }
    .q-text {
      font-size: 13px;
      color: var(--uu-4);
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      line-height: 1.5;
    }
    .empty-questions {
      padding: 20px;
      text-align: center;
      font-size: 12px;
      color: #9ca3af;
    }
    .ai-history-sidebar {
      width: 260px;
      min-width: 260px;
      max-width: 260px;
      flex-shrink: 0;
      border-right: 1px solid var(--uu-f0);
      display: flex;
      flex-direction: column;
      background: var(--uu-fa);
    }
    .ai-new-chat-header {
      padding: 10px; font-size: 14px; border-bottom: 1px solid var(--uu-f0);
    }
    .ai-new-chat-btn {
      width: 100%; height: 40px; border: 1px solid var(--uu-primary); background: transparent;
      color: var(--uu-primary); border-radius: 8px; cursor: pointer; display: flex;
      align-items: center; justify-content: center; gap: 8px; padding: 0;
      font-size: 14px; font-weight: 500; transition: all 0.3s;
    }
    .ai-new-chat-btn:hover { background: var(--uu-primary); color: var(--uu-f); }
    
    .ai-history-list { flex: 1; overflow-y: auto; padding: 8px; }
    .ai-history-item {
      padding: 6px 12px; font-size: 13px; margin-bottom: 4px; border-radius: 6px;
      cursor: pointer; transition: all 0.2s; position: relative;
      display: flex; justify-content: space-between; align-items: center;
      border: 1px solid transparent;
    }
        .ai-history-item.active {
            background: var(--uu-primary-a1);
            color: var(--uu-primary);
        }
        .ai-history-item:hover {
            background: var(--uu-f2);
            color: var(--uu-primary);
        }
        .ai-history-item.active:hover {
            background: var(--uu-primary-a2);
            color: var(--uu-primary-h);
        }canvas.]
    .ai-history-item.active .history-name { font-weight: 500; }
    .history-item-content { flex: 1; overflow: hidden; min-width: 0; }
    .history-name { 
      font-size: 13px; font-weight: 400;
      white-space: nowrap; overflow: hidden; text-overflow: ellipsis; 
      text-align: left; 
      line-height: 1.4;
      margin-bottom: 2px;
    }
    .history-time { 
      font-size: 11px; 
      opacity: 0.5; 
      margin-top: 2px;
      text-align: left;
      color: var(--uu-7);
    }
    .delete-btn {
      opacity: 0; padding: 4px; border: none;
      background: transparent; border-radius: 4px;
      cursor: pointer; color: #9ca3af; transition: all 0.2s;
      display: flex; align-items: center; justify-content: center;
    }
    .ai-history-item:hover .delete-btn { opacity: 1; }
    .delete-btn:hover { color: #ef4444; background: #fee2e2; }
    
    .ai-chat-main { 
      flex: 1; 
      min-width: 0;
      display: flex; 
      flex-direction: column;
    }
    .ai-messages { 
      flex: 1; 
      overflow-y: auto; 
      overflow-x: hidden;
      padding: 24px;
    }
    
    .ai-message { margin-bottom: 20px; display: flex; flex-direction: column; }
    .ai-message.user { align-items: flex-end; }
    .ai-message-content {
      max-width: 100%; 
      padding: 12px 16px; 
      border-radius: 12px;
      line-height: 1.6; 
      font-size: 13px; 
      word-wrap: break-word;
      word-break: break-word;
      overflow-wrap: break-word;
    }
    .ai-message.user .ai-message-content {
      background: var(--uu-primary); color: var(--uu-f);
    }
    .ai-message.assistant .ai-message-content { background: var(--uu-f3); }
    .bubble-time { font-size: 12px; opacity: 0.6; margin-top: 6px; }
    
    .ai-input-area {
      padding: 16px 20px; border-top: 1px solid var(--uu-e5); background: var(--uu-f);
    }
    .ai-input-container {
      display: flex; gap: 12px; align-items: center;
    }
    .ai-textarea {
      flex: 1; padding: 8px 12px; font-size: 14px; border: 1px solid var(--uu-e5); border-radius: 8px;
      resize: none; height: 40px; font-family: inherit;
      transition: border-color 0.2s;
    }
    .ai-textarea::placeholder {
      font-size: 13px;
      font-weight: 400;
      color: #9ca3af;
      opacity: 0.8;
    }
    .ai-textarea:focus {
      outline: none;
      border-color: var(--uu-primary);
    }
    .ai-textarea:disabled {
      background: #f9fafb;
      cursor: not-allowed;
    }
    .ai-send-btn {
      height: 36px; padding: 0 16px; min-width: 56px; background: var(--uu-primary); color: var(--uu-f); border: none;
      border-radius: 6px; cursor: pointer; font-size: 13px; font-weight: 500;
    }
    .ai-send-btn:hover { background: #66b1ff; }
    .ai-send-btn:disabled { opacity: 0.5; cursor: not-allowed; }
    .ai-cancel-btn {
      height: 36px; padding: 0 16px; min-width: 56px;
      background: #fff; color: #f56c6c; border: 1px solid #f56c6c;
      border-radius: 6px; cursor: pointer; font-size: 13px; font-weight: 500;
      transition: all 0.3s;
    }
    .ai-cancel-btn:hover {
      background: #f56c6c; color: #fff; border-color: #f56c6c;
    }
    
    .data-table-container { margin: 16px 0; overflow-x: auto; }
    .data-table {
      width: 100%; border-collapse: collapse; background: var(--uu-f);
      border: 1px solid var(--uu-e5); border-radius: 8px;
    }
    .data-table th, .data-table td {
      padding: 10px; font-size: 13px; text-align: left; border-bottom: 1px solid var(--uu-e5);
    }
    .data-table th {
      background: #f9fafb; font-weight: 500; color: var(--uu-4);
    }
    .data-table td.text-right { text-align: right; }
    
    .charts-container {
      display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
      gap: 20px; margin: 20px 0;
    }
    .echarts-container { 
      width: 100%; height: 400px; cursor: pointer;
      border: 1px solid var(--uu-e5); border-radius: 8px; padding: 10px;
    }
    
    .empty-state { 
      display: flex; flex-direction: column; align-items: center; 
      justify-content: center; padding: 60px 20px; 
    }
    .welcome-card { 
      text-align: center; margin-bottom: 40px; 
    }
    .welcome-icon { 
      width: 80px; height: 80px; margin: 0 auto 20px;
      background: linear-gradient(135deg, var(--uu-primary) 0%, #66b1ff 100%);
      border-radius: 50%; display: flex; align-items: center;
      justify-content: center; color: var(--uu-f); font-size: 48px;
    }
    .welcome-card h2 { 
      font-size: 20px; margin-bottom: 12px; color: var(--uu-2); 
    }
    .welcome-card p { 
      font-size: 13px; color: var(--uu-7); line-height: 1.6; 
    }
    .quick-questions { 
      width: 100%; max-width: 600px; 
    }
    .section-title { 
      font-size: 14px; font-weight: 500; color: var(--uu-4); 
      margin-bottom: 16px; text-align: center; 
    }
    .question-grid { 
      display: grid; grid-template-columns: repeat(2, 1fr); 
      gap: 12px; 
    }
    .question-card { 
      padding: 16px; background: var(--uu-f); border: 1px solid var(--uu-e5);
      border-radius: 12px; cursor: pointer; transition: all 0.3s;
      display: flex; align-items: center; gap: 12px;
    }
    .question-card:hover { 
      border-color: var(--uu-primary); background: #f0f7ff; transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(64, 158, 255, 0.15);
    }
    .question-card svg { 
      width: 20px; height: 20px; color: var(--uu-primary); flex-shrink: 0;
    }
    .question-card span { 
      font-size: 13px; color: var(--uu-4); 
    }