feat: add mastery feature to recitation wheel

static/css/recitation.css

@@ -70,7 +70,7 @@
     font-size: 0.9em;
 }
 
-/* 转盘样式 */
+/* ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ */
 .wheel-container {
     position: relative;
     width: 400px;
@@ -147,7 +147,75 @@
     justify-content: center;
 }
 
-/* 排序结果列表 */
+/* 掌握按钮样式 */
+.mastery-buttons {
+    display: flex;
+    gap: 15px;
+    justify-content: center;
+    margin-top: 20px;
+    flex-wrap: wrap;
+}
+
+.btn-mastered {
+    padding: 12px 30px;
+    font-size: 1em;
+    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
+    color: white;
+    border: none;
+    border-radius: 25px;
+    cursor: pointer;
+    transition: all 0.3s;
+    font-weight: bold;
+    box-shadow: 0 4px 15px rgba(67, 233, 123, 0.3);
+}
+
+.btn-mastered:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 6px 20px rgba(67, 233, 123, 0.4);
+}
+
+.btn-mastered:active {
+    transform: translateY(0);
+}
+
+.btn-forgot {
+    padding: 12px 30px;
+    font-size: 1em;
+    background: linear-gradient(135deg, #f5576c 0%, #fa709a 100%);
+    color: white;
+    border: none;
+    border-radius: 25px;
+    cursor: pointer;
+    transition: all 0.3s;
+    font-weight: bold;
+    box-shadow: 0 4px 15px rgba(245, 87, 108, 0.3);
+}
+
+.btn-forgot:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 6px 20px rgba(245, 87, 108, 0.4);
+}
+
+.btn-forgot:active {
+    transform: translateY(0);
+}
+
+/* 掌握情况信息 */
+.mastery-info {
+    text-align: center;
+    margin-top: 15px;
+    padding: 10px;
+    color: #666;
+    font-size: 0.95em;
+}
+
+.mastery-info #remainingNum {
+    color: #667eea;
+    font-weight: bold;
+    font-size: 1.2em;
+}
+
+/* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>б<EFBFBD> */
 .sorted-list {
     background: white;
     border-radius: 10px;
@@ -189,9 +257,30 @@
 .sorted-item-text {
     flex: 1;
     color: #333;
+    position: relative;
 }
 
-/* 导出按钮样式 */
+/* 已掌握的项目样式 */
+.sorted-item-mastered {
+    background: #d4edda;
+    border-left-color: #28a745;
+    opacity: 0.7;
+}
+
+.sorted-item-mastered .sorted-item-text {
+    color: #155724;
+    text-decoration: line-through;
+}
+
+.mastered-icon {
+    display: inline-block;
+    margin-left: 10px;
+    color: #28a745;
+    font-weight: bold;
+    font-size: 1.1em;
+}
+
+/* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ť<EFBFBD><C5A5>ʽ */
 .export-buttons {
     display: flex;
     gap: 10px;
@@ -219,7 +308,7 @@
     transform: translateY(0);
 }
 
-/* 响应式设计 */
+/* <EFBFBD><EFBFBD>Ӧʽ<EFBFBD><EFBFBD><EFBFBD> */
 @media (max-width: 768px) {
     .wheel-container {
         width: 300px;