feat: complete web app features and fix encoding

static/css/recitation.css

@@ -191,6 +191,34 @@
     color: #333;
 }
 
+/* 导出按钮样式 */
+.export-buttons {
+    display: flex;
+    gap: 10px;
+    margin-bottom: 20px;
+    flex-wrap: wrap;
+}
+
+.btn-export {
+    padding: 10px 20px;
+    background: #28a745;
+    color: white;
+    border: none;
+    border-radius: 5px;
+    cursor: pointer;
+    font-size: 0.9em;
+    transition: all 0.3s;
+}
+
+.btn-export:hover {
+    background: #218838;
+    transform: translateY(-2px);
+}
+
+.btn-export:active {
+    transform: translateY(0);
+}
+
 /* 响应式设计 */
 @media (max-width: 768px) {
     .wheel-container {