* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: "Microsoft Yahei", sans-serif;
    }
    body {
      background: #f8fafc;
      padding: 20px;
    }
    .container {
      display: flex;
      gap: 20px;
    }
    /* 日历区域 */
    .calendar-section {
      flex: 3;
      background: #fff;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }
    .calendar-title {
      text-align: center;
      font-size: 24px;
      font-weight: bold;
      margin-bottom: 10px;
    }
    .calendar-subtitle {
      text-align: center;
      color: #666;
      font-size: 14px;
      margin-bottom: 20px;
    }
    .months-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .month-card {
      background: #fff;
      border: 1px solid #eee;
      border-radius: 8px;
      padding: 10px;
    }
    .month-header {
      text-align: center;
      font-weight: bold;
      margin-bottom: 10px;
      font-size: 16px;
    }
    .weekdays {
      display: grid;
      grid-template-columns: repeat(7, 1fr);
      text-align: center;
      color: #666;
      font-size: 12px;
      margin-bottom: 5px;
    }
    .days-grid {
      display: grid;
      grid-template-columns: repeat(7, 1fr);
      /* ✅ 只加这一行：给日期添加上下缝隙 */
      gap: 2px 0;
    }
    .day {
      height: 32px;
      line-height: 32px;
      text-align: center;
      border-radius: 3px; /* 轻微圆角更好看 */
      cursor: pointer;
      transition: background 0.2s;
      position: relative;
      border: none;
    }
    .day:hover {
      background: #f0f0f0;
    }
    /* 🔥 极限运动风格配色（仅修改这里） */
    .mark-base { background-color: #FF7A00; }     /* 基础跳伞课程 - 活力橙黄 */
    .mark-advance { background-color: #0052CC; } /* 进阶技巧训练 - 深海藏青 */
    .mark-group { background-color: #00B42A; }    /* 团体跳伞活动 - 机能翠绿 */
    .mark-stunt { background-color: #F53F3F; }     /* 特技跳伞表演 - 竞技正红 */
    .mark-competition { background-color: #722ED1; } /* 比赛/竞赛日 - 潮流紫 */
    .mark-training { background-color: #13C2C2; } /* 教练培训 - 冷调青蓝 */
    
    /* 多色标注样式 */
    .day-multi-colors {
      position: relative;
      overflow: hidden;
      border-radius: 3px;
    }
    .color-stripes {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      display: flex;
      flex-direction: column;
      border-radius: 3px;
    }
    .color-stripe {
      flex: 1;
      margin: 0;
      padding: 0;
    }
    .day-number {
      position: relative;
      z-index: 2;
      color: white;
      font-weight: bold;
      text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.3);
    }
    
    /* 单色标注样式 */
    .day-single-color {
      position: relative;
      border-radius: 3px;
    }
    .day-single-color .day-number {
      position: relative;
      z-index: 2;
      color: white;
      font-weight: bold;
      text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.3);
    }
    
    /* 弹窗样式（保留但不再使用） */
    .modal {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.5);
      justify-content: center;
      align-items: center;
      z-index: 999;
    }
    .modal-content {
      background: #fff;
      padding: 20px;
      border-radius: 8px;
      width: 320px;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
      position: relative;
    }
    .modal-close {
      position: absolute;
      top: 10px;
      right: 10px;
      cursor: pointer;
      font-size: 20px;
      color: #999;
    }
    .modal-title {
      font-size: 18px;
      font-weight: bold;
      margin-bottom: 15px;
      color: #ff4d4f;
    }
    .activity-item {
      margin-bottom: 15px;
      padding-left: 10px;
      border-left: 2px solid #1890ff;
    }
    .activity-title {
      font-weight: bold;
      margin-bottom: 4px;
    }
    .activity-desc {
      font-size: 14px;
      color: #666;
    }
    /* 底部按钮 */
    .year-buttons {
      display: flex;
      justify-content: center;
      gap: 10px;
      margin: 20px 0;
    }
    .year-btn {
      padding: 6px 12px;
      border: none;
      border-radius: 4px;
      background: #e0e0e0;
      cursor: pointer;
      transition: background 0.2s;
    }
    .year-btn:hover {
      background: #d0d0d0;
    }
    .year-btn.active {
      background: #1890ff;
      color: #fff;
    }
    /* 颜色说明 */
    .legend {
      background: #fff;
      padding: 15px;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
      margin-top: 20px;
    }
    .legend-title {
      font-weight: bold;
      margin-bottom: 10px;
    }
    .legend-items {
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
    }
    .legend-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .legend-color {
      width: 16px;
      height: 16px;
      border-radius: 4px;
    }

    /* 右侧详情区域 */
    .detail-section {
      flex: 1;
      background: #fff;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
      display: flex;
      flex-direction: column;
    }
    .detail-title {
      font-size: 18px;
      font-weight: bold;
      margin-bottom: 15px;
    }
    .detail-date {
      font-size: 16px;
      color: #666;
      margin-bottom: 10px;
      text-align: center;
      padding-bottom: 10px;
      border-bottom: 1px solid #eee;
    }
    .activity-list {
      display: flex;
      flex-direction: column;
      gap: 15px;
      margin-bottom: 20px;
      flex: 1;
      overflow-y: auto;
    }
    .activity-card {
      display: flex;
      gap: 10px;
      padding: 10px;
      border: 1px solid #eee;
      border-radius: 6px;
    }
    .activity-img {
      width: 60px;
      height: 60px;
      background: #eee;
      border-radius: 4px;
      object-fit: cover;
    }
    .activity-info {
      flex: 1;
    }
    .activity-name {
      font-weight: bold;
      margin-bottom: 4px;
    }
    .activity-tag {
      display: inline-block;
      padding: 2px 6px;
      border-radius: 4px;
      color: #fff;
      font-size: 12px;
      margin-right: 6px;
    }
    .activity-date {
      font-size: 14px;
      color: #666;
    }
    .no-activity {
      text-align: center;
      padding: 40px 20px;
      color: #999;
    }
    .detail-buttons {
      display: flex;
      gap: 10px;
    }
    .detail-btn {
      flex: 1;
      padding: 10px;
      border: none;
      border-radius: 4px;
      cursor: pointer;
      font-size: 14px;
      transition: opacity 0.2s;
    }
    .detail-btn:hover {
      opacity: 0.9;
    }
    .btn-primary {
      background: #1890ff;
      color: #fff;
    }
    .btn-secondary {
      background: #666;
      color: #fff;
    }