feat: 移动端优化

- 响应式布局（768px 和 400px 断点）
- 统计卡片小屏 3 列/2 列布局
- Tab 按钮小屏横向滚动/垂直堆叠
- 日历组件小屏垂直布局
- 触摸友好的交互（点击反馈、tap-highlight）
- 最小点击区域 44x44px（符合移动端规范）
- 字体和间距适配小屏

frontend/index.html

@@ -73,11 +73,16 @@
             color: #666;
             transition: all 0.3s;
             box-shadow: 0 2px 4px rgba(0,0,0,0.1);
+            -webkit-tap-highlight-color: transparent;
+            touch-action: manipulation;
         }
         .tab-btn:hover {
             background: #f8f9fa;
             transform: translateY(-2px);
         }
+        .tab-btn:active {
+            transform: scale(0.98);
+        }
         .tab-btn.active {
             background: linear-gradient(135deg, #667eea, #764ba2);
             color: white;
@@ -119,13 +124,24 @@
             background: #667eea;
             color: white;
             border: none;
-            padding: 5px 10px;
+            padding: 8px 12px;
             border-radius: 5px;
             cursor: pointer;
+            min-width: 44px;
+            min-height: 44px;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            -webkit-tap-highlight-color: transparent;
+            touch-action: manipulation;
         }
         .calendar-header button:hover {
             background: #5568d3;
         }
+        .calendar-header button:active {
+            background: #4857c0;
+            transform: scale(0.95);
+        }
         .calendar-grid {
             display: grid;
             grid-template-columns: repeat(7, 1fr);
@@ -146,10 +162,18 @@
             border-radius: 5px;
             cursor: pointer;
             transition: all 0.2s;
+            -webkit-tap-highlight-color: transparent;
+            touch-action: manipulation;
+            min-width: 36px;
+            min-height: 36px;
         }
         .calendar-day:hover {
             background: #e0e7ff;
         }
+        .calendar-day:active {
+            background: #c7d2fe;
+            transform: scale(0.95);
+        }
         .calendar-day.selected {
             background: #667eea;
             color: white;
@@ -188,11 +212,17 @@
             border-radius: 5px;
             cursor: pointer;
             transition: all 0.2s;
+            -webkit-tap-highlight-color: transparent;
+            touch-action: manipulation;
         }
         .task-item:hover, .diary-item:hover {
             transform: translateX(5px);
             box-shadow: 0 2px 8px rgba(0,0,0,0.1);
         }
+        .task-item:active, .diary-item:active {
+            transform: scale(0.98);
+            background: #eef1f5;
+        }
         .task-item.status-pending { border-left-color: #6b7280; }
         .task-item.status-in_progress { border-left-color: #3b82f6; }
         .task-item.status-blocked { border-left-color: #f59e0b; }
@@ -381,12 +411,124 @@
             grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
             gap: 30px;
         }
+        
+        /* 移动端优化 */
         @media (max-width: 768px) {
-            .grid-2, .calendar-wrapper {
+            body {
-                grid-template-columns: 1fr;
+                padding: 10px;
+            }
+            header h1 {
+                font-size: 1.8em;
+            }
+            header p {
+                font-size: 0.9em;
+            }
+            .stats {
+                grid-template-columns: repeat(3, 1fr);
+                gap: 10px;
+                margin-bottom: 20px;
+            }
+            .stat-card {
+                padding: 10px;
+            }
+            .stat-card h3 {
+                font-size: 1.4em;
+            }
+            .stat-card p {
+                font-size: 0.75em;
+            }
+            .tabs {
+                gap: 8px;
+                margin-bottom: 15px;
+            }
+            .tab-btn {
+                padding: 10px 16px;
+                font-size: 0.9em;
+                flex: 1;
+                text-align: center;
+            }
+            .section-box {
+                padding: 15px;
+                margin-bottom: 20px;
+            }
+            .section-box h2 {
+                font-size: 1.3em;
+                margin-bottom: 15px;
+            }
+            .calendar-wrapper {
+                flex-direction: column;
+                gap: 15px;
             }
             .calendar {
-                flex: 1;
+                flex: none;
+                width: 100%;
+                padding: 10px;
+            }
+            .calendar-header span {
+                font-size: 0.9em;
+            }
+            .calendar-header button {
+                padding: 3px 8px;
+                font-size: 0.9em;
+            }
+            .calendar-day {
+                font-size: 0.75em;
+                aspect-ratio: 1;
+            }
+            .calendar-day-header {
+                font-size: 0.65em;
+            }
+            .content-area {
+                width: 100%;
+            }
+            .task-item, .diary-item {
+                padding: 12px;
+                margin-bottom: 12px;
+            }
+            .task-item .title, .diary-item .title {
+                font-size: 1em;
+            }
+            .task-item .status {
+                font-size: 0.75em;
+                padding: 3px 10px;
+            }
+            .task-item .priority {
+                font-size: 0.75em;
+            }
+            .task-detail .meta {
+                flex-direction: column;
+                gap: 8px;
+            }
+            .task-detail .meta-item {
+                font-size: 0.85em;
+            }
+            .experience-item .title {
+                font-size: 1em;
+            }
+            .experience-item .category {
+                font-size: 0.75em;
+            }
+        }
+        
+        /* 超小屏幕（< 400px） */
+        @media (max-width: 400px) {
+            .stats {
+                grid-template-columns: repeat(2, 1fr);
+            }
+            .stat-card h3 {
+                font-size: 1.2em;
+            }
+            .stat-card p {
+                font-size: 0.7em;
+            }
+            header h1 {
+                font-size: 1.5em;
+            }
+            .tabs {
+                flex-direction: column;
+            }
+            .tab-btn {
+                width: 100%;
             }
         }
     </style>