feat(static): 优化社区首页 — Hero首屏+特性卡片+悬浮毛玻璃导航，CTA随登录态切换

static/public/js/index.js

@@ -1,16 +1,30 @@
 /* index.js — 社区首页逻辑
  *
  * 登录态检测：POST /whoami（HttpOnly q4_token Cookie 自动携带，JS 不经手 Token）
- * 已登录：显示用户名与"进入笔记/退出"按钮；未登录：显示"登录/注册"
+ * 已登录：显示头像/用户名与"进入笔记/退出"按钮，首屏 CTA 指向笔记页
+ * 未登录：显示"登录/注册"，首屏 CTA 指向登录页
  */
 (function () {
 	'use strict';
 
 	const nameEl = document.getElementById('name');
+	const avatarEl = document.getElementById('avatar');
 	const enterBtn = document.getElementById('enterBtn');
 	const logoutBtn = document.getElementById('logoutBtn');
 	const loginBtn = document.getElementById('loginBtn');
 	const registerBtn = document.getElementById('registerBtn');
+	const ctaBtn = document.getElementById('ctaBtn');
+	const logoEl = document.getElementById('logo');
+
+	let loggedIn = false;
+
+	function go(url) { window.location.href = url; }
+
+	logoEl.addEventListener('click', () => go('index.html'));
+	enterBtn.addEventListener('click', () => go('dnfs.html'));
+	loginBtn.addEventListener('click', () => go('login.html'));
+	registerBtn.addEventListener('click', () => go('register.html'));
+	ctaBtn.addEventListener('click', () => go(loggedIn ? 'dnfs.html' : 'login.html'));
 
 	async function checkLogin() {
 		try {
@@ -18,11 +32,15 @@
 			if (!res.ok) return;
 			const data = await res.json();
 			if (data && data.login && data.user) {
+				loggedIn = true;
 				nameEl.textContent = String(data.user);
+				nameEl.style.display = '';
+				avatarEl.style.display = '';
 				enterBtn.style.display = '';
 				logoutBtn.style.display = '';
 				loginBtn.style.display = 'none';
 				registerBtn.style.display = 'none';
+				ctaBtn.textContent = '进入我的知识树';
 			}
 		} catch (e) {
 			console.warn('index: 登录态检测失败', e.message);