* {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    :root {
  --bg-color: #f8f9fa;
  --card-bg: #ffffff;
  --text-primary: #2c3e50;    /* 文字主色 */
  --text-secondary: #7f8c8d;  /* 文字次色 */
  --border-color: #e9ecef;
  --class-color: #42a5f5;     /* 分类颜色 */
  --exam-color: #ef5350;
  --meeting-color: #ab47bc;
  --assignment-color: #ffa726;
  --other-color: #66bb6a;
}

    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
        background: var(--bg-color);
        color: var(--text-primary);
        padding: 30px 20px;
        line-height: 1.6;
        overflow-x: hidden;
    }

    .container {
        max-width: 950px;
        margin: 0 auto;
        background: var(--card-bg);
        border-radius: 20px;
        padding: 35px;
        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    }

    .header {
        text-align: center;
        margin-bottom: 35px;
    }

    .header h1 {
        font-size: 1.8rem;
        font-weight: 600;
        color: var(--text-primary);
        margin-bottom: 8px;
    }

    .header p {
        color: var(--text-secondary);
        font-size: 0.95rem;
    }

    .calendar-nav {
        position: relative;
        display: flex;
        justify-content: space-between; /* 保持日期与按钮左右 */
        align-items: center;
        gap: 10px;
        padding: 15px 20px;
    }

.month-year {
  text-align: center;
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--text-primary);
  width: 100%;
}

.add-event-btn {
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  border: 2px solid #2d7dc1;
  color: #2d7dc1;
  font-weight: bold;
  font-size: 1.2rem;
  padding: 6px 14px;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 2px 6px rgb(0 0 0 / 0.15);
  transition: background-color 0.25s ease;
  z-index: 10;
}

.month-year-container {
  position: relative;
  display: inline-block;
  width: 100%;
}

    .nav-buttons {
        display: flex;
        gap: 10px;
        flex-wrap: nowrap;        
        overflow-x: auto;         /* 如果按钮太多可横向滚动 */
    }

    .nav-btn {
        background: var(--card-bg);
        border: 1px solid var(--border-color);
        color: var(--text-primary);
        padding: 8px 18px;
        border-radius: 8px;
        cursor: pointer;
        font-size: 0.9rem;
        transition: all 0.2s;
        font-weight: 500;
        white-space: nowrap;
        flex-shrink: 0;
    }

    .nav-btn:hover {
        background: var(--text-primary);
        color: var(--card-bg);
        border-color: var(--text-primary);
        transform: translateY(-1px);
    }

    .weekdays {
        display: grid;
        grid-template-columns: repeat(7, 1fr);
        gap: 12px;
        margin-bottom: 12px;
    }

    .weekday {
        text-align: center;
        padding: 12px 0;
        font-size: 0.85rem;
        font-weight: 600;
        color: var(--text-secondary);
        background: var(--bg-color);
        border-radius: 8px;
    }

    .calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 10px;
    }
    
    .day-cell {
        height: 56px;           /* 可根据页面调整高度 */
        background: #fff;
        border-radius: 12px;
        box-shadow: none;       /* 取消单独阴影 */
        border: none;           /* 取消边框 */
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        font-size: 1rem;
        position: relative;
        cursor: pointer;
        transition: background 0.2s;
    }
    .day-cell:hover {
        background: var(--hover-bg);
        transform: translateY(-3px);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        border-color: var(--today-border);
    }

    .day-cell.other-month {
        opacity: 0.4;
        background: var(--bg-color);
    }

    .day-cell.today {
        background: #e3f2fd;    /* 今日高亮 */
        color: #1976d2;
        font-weight: 700;
    }

    .day-cell.today .day-number {
        color: #1976d2;
        font-weight: 700;
    }

    .day-cell.selected {
        border-color: #1976d2;
        box-shadow: 0 4px 16px rgba(25, 118, 210, 0.3);
    }

    .day-number {
        font-size: 1rem;
        font-weight: 600;
        text-align: center;
        margin-bottom: 0;
        width: 100%;
    }

    .event-indicators {
        position: absolute;
        bottom: 6px;
        left: 0;
        width: 100%;
        display: flex;
        justify-content: center;
        gap: 4px;
    }

    .indicator-dot {
        width: 7px;
        height: 7px;
        border-radius: 50%;
        transition: transform 0.2s;
    }

    .day-cell:hover .indicator-dot {
        transform: scale(1.2);
    }

    .indicator-dot.class {
        background: var(--class-color);
    }

    .indicator-dot.exam {
        background: var(--exam-color);
    }

    .indicator-dot.meeting {
        background: var(--meeting-color);
    }

    .indicator-dot.assignment {
        background: var(--assignment-color);
    }

    .indicator-dot.other {
        background: var(--other-color);
    }

    .legend {
        display: flex;
        justify-content: center;
        gap: 25px;
        margin-top: 30px;
        padding: 20px;
        border-radius: 12px;
        flex-wrap: wrap;
    }

    .legend-item {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 0.9rem;
        color: var(--text-secondary);
    }

    .legend-dot {
        width: 10px;
        height: 10px;
        border-radius: 50%;
    }

    /* 事件面板 */
    .event-panel {
        position: fixed;
        bottom: -100%;
        left: 0;
        right: 0;
        background: var(--card-bg);
        border-radius: 24px 24px 0 0;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
        padding: 30px 20px;
        max-height: 65vh;
        overflow-y: auto;
        transition: bottom 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1000;
        width: 100vw;
        max-width: 100%;
        box-sizing: border-box;
    }

    .event-panel.active {
        bottom: 0;
    }

    .event-panel-header {
        position: relative;
        display: flex;
        justify-content: center;
        align-items: center;
        padding-bottom: 20px;
        border-bottom: 2px solid var(--border-color);
        min-height: 60px; /* 可调整避免按钮溢出 */
    }

    .event-date {
        font-size: 1.3rem;
        font-weight: 600;
        color: var(--text-primary);
        text-align: center;
        flex: 1;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        line-height: 38px; /* 同关闭按钮高度对齐 */
    }


    .close-btn {
        position: absolute;
        right: 18px;
        top: 35%; /* 让关闭按钮与日期文字整体中心线对齐 */
        transform: translateY(-50%);
        background: var(--bg-color);
        border: none;
        width: 38px;
        height: 38px;
        border-radius: 50%;
        cursor: pointer;
        font-size: 1.3rem;
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all 0.2s;
        flex-shrink: 0;
        /* 可选微调： */
        /* margin-top: -2px; */
    }
    
    .close-btn:hover {
        background: var(--text-primary);
        color: var(--card-bg);
        transform: translateY(-50%) rotate(90deg);
    }

    .event-list {
        display: flex;
        flex-direction: column;
        gap: 12px;
    }

    .event-item {
        border-left: 4px solid;
          padding: 10px 20px;
          margin-bottom: 12px;
          transition: all 0.3s ease;
          color: var(--text-primary);
          cursor: pointer;
    }
        
        
    .event-title {
        color: var(--text-primary);
      font-weight: 600;
      font-size: 1.1rem;
      margin-bottom: 6px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    
    .event-info-row {
      display: flex;
      justify-content: space-between;
      font-size: 0.9rem;
      color: var(--text-secondary);
      margin-bottom: 6px;
    }
    
    .event-location {
      flex-shrink: 0;
      max-width: 60%;
      white-space: nowrap;
      text-overflow: ellipsis;
      overflow: hidden;
    }
    
    .event-time {
      flex-shrink: 0;
      white-space: nowrap;
      color: var(--text-secondary);
    }
    
    .event-progress-container {
      height: 4px;
      background: #eee;
      border-radius: 2px;
      overflow: hidden;
      display: none; /* 默认隐藏进度条 */
    }
    
    .event-progress-bar {
      height: 100%;
      background-color: var(--class-color);
      width: 0;
      transition: width 0.3s ease;
    }
    
    /* 时间过了的事件灰色折叠 */
    .event-item.past-event {
      color: #999;
      background: #f4f4f4;
      border-left-color: #ddd !important; /* 灰色边线 */
    }
    
    .event-item.past-event .event-info-row,
    .event-item.past-event .event-progress-container {
      display: none !important;
    }
    
    .event-item.past-event .event-title {
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
        margin-bottom: 0;
        margin-top: 0;
    }
    
    .event-item.past-event .event-time {
      float: right;
      display: inline; /* 让时间出现在标题右边 */
      color: #aaa;
      margin-left: 10px;
    }

    .event-item:hover {
        transform: translateX(6px);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    }

    .event-item.class {
        border-left-color: var(--class-color);
    }

    .event-item.exam {
        border-left-color: var(--exam-color);
    }

    .event-item.meeting {
        border-left-color: var(--meeting-color);
    }

    .event-item.assignment {
        border-left-color: var(--assignment-color);
    }

    .event-item.other {
        border-left-color: var(--other-color);
    }

    .event-info {
        flex: 1;
        min-width: 0;
    }

    .event-header {
        display: flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 6px;
        flex-wrap: wrap;
    }

    .event-type-badge {
        display: inline-block;
        padding: 3px 10px;
        border-radius: 12px;
        font-size: 0.75rem;
        font-weight: 600;
        color: white;
        white-space: nowrap;
    }

    .event-type-badge.class {
        background: var(--class-color);
    }

    .event-type-badge.exam {
        background: var(--exam-color);
    }

    .event-type-badge.meeting {
        background: var(--meeting-color);
    }

    .event-type-badge.assignment {
        background: var(--assignment-color);
    }

    .event-type-badge.other {
        background: var(--other-color);
    }

    .event-title {
        font-size: 1rem;
        font-weight: 600;
        color: var(--text-primary);
        word-break: break-word;
        max-width: 100%;
    }

    .event-time {
        font-size: 0.9rem;
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        gap: 6px;
        white-space: nowrap;
        flex-shrink: 0;
    }

    .overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.4);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s;
        z-index: 999;
    }

    .overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .no-events {
        text-align: center;
        padding: 50px 20px;
        color: var(--text-secondary);
    }

    .no-events-icon {
        font-size: 3rem;
        margin-bottom: 15px;
        opacity: 0.5;
    }
    
    .event-item.class { border-left-color: var(--class-color); }
.event-item.exam { border-left-color: var(--exam-color); }
.event-item.meeting { border-left-color: var(--meeting-color); }
.event-item.assignment { border-left-color: var(--assignment-color); }
.event-item.other { border-left-color: var(--other-color); }

.legend.legend-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;            /* 缩小间距 */
    margin-top: 12px;    /* 缩小外边距 */
    padding: 4px 8px;    /* 缩小内边距 */
    border-radius: 8px;
    font-size: 0.85rem;  /* 整体字体变小 */
    color: var(--text-primary);
}

.legend-btn {
    width: 100%;
    min-width: 0;
    white-space: nowrap;
    padding: 4px 0;       /* 减小按钮高度 */
    border-radius: 8px;
    background: #f0f4fa;
    color: var(--text-primary);
    font-weight: 500;
    letter-spacing: 1px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    border: 2px solid transparent;
    font-size: 0.85rem;    /* 按钮字体也对应缩小 */
}



.legend-btn.class {
    border-color: var(--class-color);
}

.legend-btn.assignment {
    border-color: var(--assignment-color);
}

.legend-btn.exam {
    border-color: var(--exam-color);
}

.legend-btn.other {
    border-color: var(--other-color);
}

.legend-btn:not(.selected) { opacity: 0.3; }


    /* 移动端适配 */
    @media (max-width: 768px) {
        body {
            padding: 15px 0px;
        }

        .container {
            padding: 20px 6px;
            border-radius: 16px;
        }

        .add-event-btn {
    width: 38px;
    height: 38px;
    padding: 0;
    border-radius: 50%;
    font-size: 1.5rem; /* 按钮内“+”符号大小 */
    line-height: 38px;
    text-align: center;
  }

        .header h1 {
            font-size: 1.4rem;
        }

        .calendar-nav {
            flex-direction: column;
            gap: 10px;
            padding: 12px 15px;
            align-items: center;
        }

        .month-year {
            font-size: 1.2rem;
            text-align: center;
        }

        .nav-buttons {
            width: 100%;
            justify-content: center;
            gap: 15px;
            overflow-x: auto;
        }

        .nav-btn {
            padding: 10px 14px;
            font-size: 1rem;
        }

        .weekdays {
            gap: 8px;
            font-size: 0.8rem;
            grid-template-columns: repeat(7, 1fr);
            margin-bottom: 10px;
        }

        .weekday {
            padding: 10px 0;
            border-radius: 10px;
        }

        .calendar-grid {
            gap: 8px;
            grid-template-columns: repeat(7, 1fr);
        }

        .day-cell {
            padding: 10px 6px;
            border-radius: 10px;
            font-size: 0.9rem;
            min-width: 0;
        }

        .day-number {
            font-size: 0.95rem;
        }

        .event-indicators {
            gap: 3px;
        }

        .indicator-dot {
            width: 5px;
            height: 5px;
        }

        .legend {
            gap: 15px;
            padding: 15px;
            font-size: 0.85rem;
        }

        .legend-item {
            font-size: 0.85rem;
        }
        
        .legend.legend-buttons {
        gap: 4px;
        margin-top: 8px;
        padding: 2px 6px;
        font-size: 0.75rem;
    }
    .legend-btn {
        font-size: 0.75rem;
        padding: 3px 0;
    }
        
        .event-panel {
            padding: 25px 15px;
            border-radius: 20px 20px 0 0;
            max-height: 60vh;
            width: 100vw;
        }

        .event-panel-header {
            gap: 8px;
            padding-bottom: 15px;
        }

        .event-date {
            font-size: 1.1rem;
            flex-shrink: 1;
            text-align: center;
            width: 100%;
        }

        .close-btn {
            width: 36px;
            height: 36px;
            font-size: 1.2rem;
        }

        .event-list {
            margin-top: 10px;
            gap: 10px;
        }

        .event-item {
            padding: 15px 16px;
            font-size: 0.95rem;
            flex-direction: column;
            align-items: flex-start;
            gap: 8px;
        }

        .event-header {
            gap: 6px;
            flex-wrap: wrap;
        }

        .event-time {
            white-space: normal;
            font-size: 0.85rem;
        }

        .event-title {
            font-size: 1rem;
        }
    }