样式修改完成，待测试

html/usercenter.html

@@ -139,28 +139,6 @@
           </button>
         </div>
       </div>
-
-        <div class="wechatBindCard" id="wechat-bind-card">
-          <div class="wechatBindTop">
-            <div class="wechatBindIconBox">
-              <img class="wechatBindIcon" src="../public/img/pay-wechat.png" alt="微信" />
-            </div>
-            <div class="wechatBindInfo">
-              <div class="wechatBindTitle">微信账号</div>
-              <div class="wechatBindDesc" id="wechat-bind-desc">正在检测绑定状态...</div>
-            </div>
-            <div class="wechatBindStateDot"></div>
-          </div>
-          <div class="wechatBindLine"></div>
-          <button
-            type="button"
-            class="wechatBindButton"
-            id="wechat-bind-button"
-            onclick="openWeChatBindPopup()"
-          >
-            绑定微信
-          </button>
-        </div>
       <!-- Balance Cards -->
       <div class="uc-balance-grid">
         <div class="uc-balance-item">
@@ -535,9 +513,24 @@
       }
 
       function updateExpertActions(data) {
-        var expert = isExpertUser(data);
-        $("#expertApplyBtn").toggle(!expert);
-        $("#publishArticleBtn").toggle(expert);
+        var state = CommonUtil.getExpertState
+          ? CommonUtil.getExpertState(data)
+          : { isExpert: isExpertUser(data), isApplying: false };
+        var $applyBtn = $("#expertApplyBtn");
+        var $publishBtn = $("#publishArticleBtn");
+        $publishBtn.toggle(state.isExpert);
+        $applyBtn.toggle(!state.isExpert);
+        if (state.isExpert) {
+          return;
+        }
+        $applyBtn
+          .text(state.isApplying ? "申请审核中" : "专家申请")
+          .prop("disabled", !!state.isApplying);
+        if (state.isApplying) {
+          $applyBtn.removeAttr("onclick");
+        } else {
+          $applyBtn.attr("onclick", "window.location.href = 'apply.html'");
+        }
       }
 
       function loadAccountInfoForWechat() {
@@ -1379,7 +1372,7 @@
             ? currentUserData.nickName || currentUserData.username || ""
             : "";
 
-          uploadedAvatarUrl = "";
+          uploadedAvatarId = "";
           userAvatarFile = null;
 
           var content =
@@ -1422,14 +1415,14 @@
             content: content,
             end: function () {
               editProfileLayerIndex = null;
-              uploadedAvatarUrl = "";
+              uploadedAvatarId = "";
               userAvatarFile = null;
             },
           });
         });
       }
 
-      var uploadedAvatarUrl = "";
+      var uploadedAvatarId = "";
       var editProfileLayerIndex = null;
       var userAvatarFile = null;
 
@@ -1443,14 +1436,19 @@
         if (!input.files || !input.files[0]) return;
 
         var file = input.files[0];
-        if (!/^image\//.test(file.type || "")) {
-          layui.layer.msg("请选择图片文件", { icon: 2 });
+        if (!/^(image\/jpeg|image\/png)$/.test(file.type || "")) {
+          layui.layer.msg("只支持 JPG/PNG 格式的图片", { icon: 2 });
+          input.value = "";
+          return;
+        }
+        if (file.size > 2 * 1024 * 1024) {
+          layui.layer.msg("图片大小不能超过 2MB", { icon: 2 });
           input.value = "";
           return;
         }
 
         userAvatarFile = file;
-        uploadedAvatarUrl = "";
+        uploadedAvatarId = "";
 
         var reader = new FileReader();
         reader.onload = function (e) {
@@ -1504,31 +1502,67 @@
             if (!avatarId) {
               throw new Error("头像上传返回缺少文件编号");
             }
-            uploadedAvatarUrl = avatarId;
+            uploadedAvatarId = avatarId;
             return avatarId;
           }
         );
       }
 
+      function validateEditProfileNickname(nickName) {
+        var nicknameWidth = Array.from(nickName).reduce(function (total, char) {
+          return total + (/[\u4e00-\u9fa5\uff00-\uffef]/.test(char) ? 2 : 1);
+        }, 0);
+
+        if (nickName.length < 2 || nicknameWidth > 12) {
+          layui.layer.msg("昵称长度应为2-6个汉字或2-12个英文", { icon: 2 });
+          $("#editNickName").focus();
+          return false;
+        }
+
+        return true;
+      }
+
       function submitEditProfile() {
         var nickName = $("#editNickName").val().trim();
         var password = $("#editPassword").val();
         var passwordConfirm = $("#editPasswordConfirm").val();
+        var currentNickName = currentUserData
+          ? currentUserData.nickName || currentUserData.username || ""
+          : "";
 
         if (!nickName) {
           layui.layer.msg("昵称不能为空", { icon: 2 });
           return;
         }
+        if (nickName !== currentNickName && !validateEditProfileNickname(nickName)) {
+          return;
+        }
+        if ((password || passwordConfirm) && (!password || !passwordConfirm)) {
+          layui.layer.msg("请输入并确认新密码", { icon: 2 });
+          return;
+        }
         if (password && password !== passwordConfirm) {
           layui.layer.msg("两次密码输入不一致", { icon: 2 });
           return;
         }
+        if (password && (password.length < 6 || password.length > 20)) {
+          layui.layer.msg("密码长度应为6-20位", { icon: 2 });
+          return;
+        }
 
-        var params = { username: nickName };
+        var params = {};
+        if (nickName !== currentNickName) {
+          params.nickName = nickName;
+        }
         if (password) {
           params.password = hex_md5(password);
         }
 
+        if (!userAvatarFile && Object.keys(params).length === 0) {
+          layui.layer.msg("暂无修改", { icon: 0 });
+          return;
+        }
+
         var $submitBtn = $("#editProfileSubmitBtn");
         $submitBtn.prop("disabled", true).text("保存中...");