style: modern UI redesign - gradients, glassmorphism, animations, Inter font

public/js/pages/register.js

@@ -4,8 +4,8 @@ const RegisterPage = {
   async render() {
     try { this.captcha = await API.get('/captcha'); } catch { this.captcha = null; }
     return `
-      <div class="pub-card wide" style="background:white;border-radius:16px;padding:36px 32px;width:540px;max-width:90vw;box-shadow:0 20px 60px rgba(0,0,0,.35)">
-        <div class="logo"><i class="fas fa-user-plus"></i><h2>注册账号</h2><p>加入MC举报系统</p></div>
+      <div class="pub-card wide">
+        <div class="logo"><i class="fas fa-user-plus"></i><h2>创建账号</h2><p>加入MC举报系统</p></div>
         <form id="reg-form">
           <div class="grid-2">
             <div class="form-group"><label>站点用户名 *</label><input id="ru" required placeholder="登录用"></div>