diff --git a/02.企业服务/04.Apache.md b/02.企业服务/04.Apache.md
index 2335433..eb6c8bf 100644
--- a/02.企业服务/04.Apache.md
+++ b/02.企业服务/04.Apache.md
@@ -271,9 +271,10 @@ TIME-WAIT 0      0      [::ffff:127.0.0.1]:80   [::ffff:127.0.0.1]:33330
 - 使用ab进行压力测试，目前的apache默认的mpm模块是event支持上万并发，效果不明显
 
 ```bash
-[root@localhost ~]# ab -c 1000 -n 10000 http://127.0.0.1/
+[root@localhost ~]# ab -k -c 1000 -n 10000 http://127.0.0.1/
 # -c	即concurrency，用于指定的并发数
 # -n	即requests，用于指定压力测试总共的执行次数
+# -k    支持keepalive场景
 ```
 
 # 4. 虚拟主机
diff --git a/02.企业服务/05.Nginx.md b/02.企业服务/05.Nginx.md
index 8017306..13ecf60 100644
--- a/02.企业服务/05.Nginx.md
+++ b/02.企业服务/05.Nginx.md
@@ -314,7 +314,7 @@ nginx: configuration file /etc/nginx/nginx.conf test is successful
 # 测试验证
 [root@localhost ~]# curl 172.16.175.129:8001
 Hello PC Website!
-[root@localhost ~]# curl -H 'Hostname: p.test.com' 172.16.175.129
+[root@localhost ~]# curl -H 'Hostname: m.test.com' 172.16.175.129
 Hello Moblie Website!
 [root@localhost ~]# curl 172.16.175.129:8003
 curl: (7) Failed to connect to 172.16.175.129 port 8003: Connection refused
@@ -658,7 +658,7 @@ server {
 # 重新编译nginx，以前的配置文件不会丢失
 [root@localhost ~]# cd /usr/local/src
 [root@localhost src]# wget https://github.com/openresty/echo-nginx-module/archive/refs/heads/master.zip
-[root@localhost src]# unzip echo-nginx-module-master.zip
+
 [root@localhost src]# mv echo-nginx-module-master echo-nginx-module
 [root@localhost src]# cd nginx-1.22.0
 [root@localhost nginx-1.22.0]# ./configure --prefix=/apps/nginx \
diff --git a/02.企业服务/07.负载均衡.md b/02.企业服务/07.负载均衡.md
index 8f30391..db97ee5 100644
--- a/02.企业服务/07.负载均衡.md
+++ b/02.企业服务/07.负载均衡.md
@@ -815,6 +815,7 @@ vrrp_instance VI_1 {
     priority 150                #优先级
     advert_int 1                #监测间隔时间
     #use_vmac				  #使用虚拟mac地址，因为路由问题，可能导致原本的IP不可用
+    vmac_xmit_base
     authentication {            #认证
         auth_type PASS          #认证方式
         auth_pass 1111          #认证密码
diff --git a/03.数据库/01.Mysql.md b/03.数据库/01.Mysql.md
index 8f8207b..b19be6e 100644
--- a/03.数据库/01.Mysql.md
+++ b/03.数据库/01.Mysql.md
@@ -174,7 +174,7 @@ useradd mysql -s /sbin/nologin -M
 -DWITH_DEBUG=0
 
 
-[root@localhost mysql-5.6.40]# c	#查看上条命令是否运行正确，0表示正确
+[root@localhost mysql-5.6.40]# echo $?	#查看上条命令是否运行正确，0表示正确
 [root@localhost mysql-5.6.40]# make -j 2
 [root@localhost mysql-5.6.40]# make install
 ```
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/.codebuddy/models.json b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/.codebuddy/models.json
new file mode 100644
index 0000000..2e3cc30
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/.codebuddy/models.json
@@ -0,0 +1,47 @@
+{
+  "models": [
+    {
+      "id": "kimi-for-coding",
+      "name": "kimi-for-coding",
+      "vendor": "user",
+      "url": "https://api.kimi.com/coding/v1",
+      "apiKey": "sk-kimi-OLoO20UJ8D3hPtywZqitU6zQO6edvWXhrRcWynoQFWBsmf38slzCG3ZbhvhLZOeS",
+      "supportsToolCall": true,
+      "supportsImages": true,
+      "supportsReasoning": false,
+      "temperature": 1
+    },
+    {
+      "id": "kimicode",
+      "name": "kimicode",
+      "vendor": "user",
+      "url": "https://api.kimi.com/coding/v1",
+      "apiKey": "sk-kimi-1sl2dMlwHcDAM5epuy4EHXhlehH38tcZxzqyOXAK7Og81HofBAcmYnW86KOd9Hdr",
+      "supportsToolCall": true,
+      "supportsImages": true,
+      "supportsReasoning": true,
+      "temperature": 1
+    },
+    {
+      "id": "mimo-v2.5-pro",
+      "name": "mimo-v2.5-pro",
+      "vendor": "user",
+      "url": "https://token-plan-cn.xiaomimimo.com/v1",
+      "apiKey": "tpqqgst8uxezjxw070kyv57vo4ayjm97go9jqk7fh",
+      "supportsToolCall": true,
+      "supportsImages": true,
+      "supportsReasoning": false
+    },
+    {
+      "id": "deepseek-v4-pro",
+      "name": "DeepSeek-V4 Pro",
+      "vendor": "user",
+      "url": "https://api.deepseek.com/chat/completions",
+      "apiKey": "sk-4456a067934f4a2a9582d0f579c7b231",
+      "supportsToolCall": true,
+      "supportsImages": false,
+      "supportsReasoning": true
+    }
+  ]
+}
+
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/admin.html b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/admin.html
new file mode 100644
index 0000000..68e4dd5
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/admin.html
@@ -0,0 +1,249 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>后台管理 - 笔记小站</title>
+<link rel="stylesheet" href="css/style.css">
+</head>
+<body>
+<nav class="navbar">
+  <a class="navbar-brand" href="index.html"><span class="logo-icon">📝</span> 笔记小站</a>
+  <div class="navbar-actions" id="navbarActions"></div>
+</nav>
+
+<div class="container" id="app">
+  <div class="admin-header">
+    <h1>⚙️ 后台管理</h1>
+  </div>
+  <div class="admin-tabs">
+    <button class="admin-tab" data-tab="categories">📂 分类管理</button>
+    <button class="admin-tab" data-tab="notes">📝 笔记管理</button>
+    <button class="admin-tab" data-tab="comments">💬 评论管理</button>
+    <button class="admin-tab" data-tab="users">👥 用户管理</button>
+  </div>
+  <div id="tabContent"></div>
+</div>
+
+<div class="toast-container" id="toastContainer"></div>
+
+<script src="js/data.js"></script>
+<script src="js/common.js"></script>
+<script>
+(function () {
+  var activeTab = getUrlParam('tab') || 'categories';
+
+  var tabs = document.querySelectorAll('.admin-tab');
+  tabs.forEach(function (t) {
+    if (t.dataset.tab === activeTab) t.classList.add('active');
+    t.addEventListener('click', function () {
+      history.replaceState(null, '', '?tab=' + this.dataset.tab);
+      activeTab = this.dataset.tab;
+      tabs.forEach(function (x) { x.classList.remove('active'); });
+      this.classList.add('active');
+      renderTab();
+    });
+  });
+  renderTab();
+
+  function renderTab() {
+    var content = document.getElementById('tabContent');
+    if (activeTab === 'categories') content.innerHTML = renderCategories();
+    else if (activeTab === 'notes') content.innerHTML = renderNotes();
+    else if (activeTab === 'comments') content.innerHTML = renderComments();
+    else if (activeTab === 'users') content.innerHTML = renderUsers();
+  }
+
+  /* ============ Categories ============ */
+  function renderCategories() {
+    var h = '<div class="section-header">';
+    h += '<h2>分类列表</h2>';
+    h += '<button class="btn btn-primary" onclick="openCategoryModal()">+ 新增分类</button>';
+    h += '</div>';
+    h += '<div class="data-table">';
+    h += '<table><thead><tr><th>ID</th><th>图标</th><th>名称</th><th>颜色</th><th>操作</th></tr></thead><tbody>';
+    DATA.categories.forEach(function (c) {
+      h += '<tr><td>' + c.id + '</td><td>' + c.icon + '</td><td>' + c.name + '</td>';
+      h += '<td><span class="color-dot" style="background:' + c.color + '"></span> ' + c.color + '</td>';
+      h += '<td><button class="btn btn-sm" onclick="openCategoryModal(' + c.id + ')">编辑</button> ';
+      h += '<button class="btn btn-sm btn-danger" onclick="deleteCategory(' + c.id + ')">删除</button></td></tr>';
+    });
+    h += '</tbody></table></div>';
+    return h;
+  }
+
+  window.openCategoryModal = function (id) {
+    var cat = id ? findById(DATA.categories, id) : null;
+    var title = cat ? '编辑分类' : '新增分类';
+    var h = '<div class="form-group"><label>名称</label><input type="text" id="fname" value="' + (cat ? cat.name : '') + '"></div>';
+    h += '<div class="form-group"><label>图标</label><input type="text" id="ficon" value="' + (cat ? cat.icon : '📁') + '"></div>';
+    h += '<div class="form-group"><label>颜色</label><input type="color" id="fcolor" value="' + (cat ? cat.color : '#6366f1') + '"></div>';
+    h += '<div class="form-actions"><button class="btn" onclick="closeModal()">取消</button>';
+    h += '<button class="btn btn-primary" onclick="saveCategory(' + (cat ? cat.id : 0) + ')">保存</button></div>';
+    renderModal(title, h);
+  };
+
+  window.saveCategory = function (id) {
+    var name = document.getElementById('fname').value.trim();
+    var icon = document.getElementById('ficon').value.trim();
+    var color = document.getElementById('fcolor').value.trim();
+    if (!name) { showToast('请输入名称', 'error'); return; }
+    if (id) {
+      var c = findById(DATA.categories, id);
+      if (c) { c.name = name; c.icon = icon; c.color = color; }
+    } else {
+      DATA.categories.push({ id: DATA.categories.length + 1, name: name, icon: icon, color: color });
+    }
+    closeModal(); renderTab(); showToast('保存成功', 'success');
+  };
+
+  window.deleteCategory = function (id) {
+    DATA.categories = DATA.categories.filter(function (c) { return c.id !== id; });
+    renderTab(); showToast('已删除', 'info');
+  };
+
+  /* ============ Notes ============ */
+  function renderNotes() {
+    var h = '<div class="section-header">';
+    h += '<h2>笔记列表</h2>';
+    h += '<button class="btn btn-primary" onclick="openNoteModal()">+ 新增笔记</button>';
+    h += '</div><div class="data-table"><table><thead><tr><th>ID</th><th>标题</th><th>分类</th><th>作者</th><th>时间</th><th>操作</th></tr></thead><tbody>';
+    DATA.notes.forEach(function (n) {
+      var cat = findById(DATA.categories, n.categoryId);
+      var author = findById(DATA.users, n.userId);
+      h += '<tr><td>' + n.id + '</td><td>' + n.title + '</td>';
+      h += '<td>' + (cat ? cat.icon + ' ' + cat.name : '-') + '</td>';
+      h += '<td>' + (author ? author.nickname : '-') + '</td><td>' + n.createdAt + '</td>';
+      h += '<td><button class="btn btn-sm" onclick="openNoteModal(' + n.id + ')">编辑</button> ';
+      h += '<button class="btn btn-sm btn-danger" onclick="deleteNote(' + n.id + ')">删除</button></td></tr>';
+    });
+    h += '</tbody></table></div>';
+    return h;
+  }
+
+  window.openNoteModal = function (id) {
+    var note = id ? findById(DATA.notes, id) : null;
+    var title = note ? '编辑笔记' : '新增笔记';
+    var h = '<div class="form-group"><label>标题</label><input type="text" id="ftitle" value="' + (note ? note.title : '') + '"></div>';
+    h += '<div class="form-group"><label>分类</label><select id="fcat">';
+    DATA.categories.forEach(function (c) {
+      h += '<option value="' + c.id + '"' + (note && note.categoryId === c.id ? ' selected' : '') + '>' + c.icon + ' ' + c.name + '</option>';
+    });
+    h += '</select></div>';
+    h += '<div class="form-group"><label>内容</label><textarea id="fcontent" rows="6">' + (note ? note.content : '') + '</textarea></div>';
+    h += '<div class="form-actions"><button class="btn" onclick="closeModal()">取消</button>';
+    h += '<button class="btn btn-primary" onclick="saveNote(' + (note ? note.id : 0) + ')">保存</button></div>';
+    renderModal(title, h);
+  };
+
+  window.saveNote = function (id) {
+    var title = document.getElementById('ftitle').value.trim();
+    var catId = parseInt(document.getElementById('fcat').value);
+    var content = document.getElementById('fcontent').value.trim();
+    if (!title || !content) { showToast('请填写标题和内容', 'error'); return; }
+    if (id) {
+      var n = findById(DATA.notes, id);
+      if (n) { n.title = title; n.categoryId = catId; n.content = content; }
+    } else {
+      DATA.notes.push({
+        id: DATA.notes.length + 1,
+        title: title,
+        categoryId: catId,
+        content: content,
+        userId: 1,
+        createdAt: new Date().toISOString().slice(0, 10),
+        summary: content.slice(0, 100) + (content.length > 100 ? '...' : '')
+      });
+    }
+    closeModal(); renderTab(); showToast('保存成功', 'success');
+  };
+
+  window.deleteNote = function (id) {
+    DATA.notes = DATA.notes.filter(function (n) { return n.id !== id; });
+    DATA.comments = DATA.comments.filter(function (c) { return c.noteId !== id; });
+    renderTab(); showToast('已删除', 'info');
+  };
+
+  /* ============ Comments ============ */
+  function renderComments() {
+    var h = '<div class="section-header"><h2>评论列表</h2></div><div class="data-table"><table><thead><tr><th>ID</th><th>笔记</th><th>用户</th><th>内容</th><th>时间</th><th>操作</th></tr></thead><tbody>';
+    DATA.comments.forEach(function (c) {
+      var note = findById(DATA.notes, c.noteId);
+      var user = findById(DATA.users, c.userId);
+      h += '<tr><td>' + c.id + '</td><td>' + (note ? note.title : '已删除') + '</td>';
+      h += '<td>' + (user ? user.nickname : (c.author || '游客')) + '</td><td>' + c.content + '</td><td>' + c.createdAt + '</td>';
+      h += '<td><button class="btn btn-sm btn-danger" onclick="deleteComment(' + c.id + ')">删除</button></td></tr>';
+    });
+    h += '</tbody></table></div>';
+    return h;
+  }
+
+  window.deleteComment = function (id) {
+    DATA.comments = DATA.comments.filter(function (c) { return c.id !== id; });
+    renderTab(); showToast('已删除', 'info');
+  };
+
+  /* ============ Users ============ */
+  function renderUsers() {
+    var h = '<div class="section-header">';
+    h += '<h2>用户列表</h2>';
+    h += '<button class="btn btn-primary" onclick="openUserModal()">+ 新增用户</button>';
+    h += '</div><div class="data-table"><table><thead><tr><th>ID</th><th>头像</th><th>用户名</th><th>昵称</th><th>角色</th><th>时间</th><th>操作</th></tr></thead><tbody>';
+    DATA.users.forEach(function (u) {
+      h += '<tr><td>' + u.id + '</td><td>' + u.avatar + '</td><td>' + u.username + '</td><td>' + u.nickname + '</td>';
+      h += '<td><span class="badge badge-' + u.role + '">' + (u.role === 'admin' ? '管理员' : '普通用户') + '</span></td>';
+      h += '<td>' + u.createdAt + '</td>';
+      h += '<td><button class="btn btn-sm" onclick="openUserModal(' + u.id + ')">编辑</button> ';
+      h += '<button class="btn btn-sm btn-danger" onclick="deleteUser(' + u.id + ')">删除</button></td></tr>';
+    });
+    h += '</tbody></table></div>';
+    return h;
+  }
+
+  window.openUserModal = function (id) {
+    var u = id ? findById(DATA.users, id) : null;
+    var title = u ? '编辑用户' : '新增用户';
+    var h = '<div class="form-group"><label>用户名</label><input type="text" id="fname" value="' + (u ? u.username : '') + '"></div>';
+    h += '<div class="form-group"><label>昵称</label><input type="text" id="fnick" value="' + (u ? u.nickname : '') + '"></div>';
+    h += '<div class="form-group"><label>角色</label><select id="frole">';
+    h += '<option value="user"' + (u && u.role === 'user' ? ' selected' : '') + '>普通用户</option>';
+    h += '<option value="admin"' + (u && u.role === 'admin' ? ' selected' : '') + '>管理员</option>';
+    h += '</select></div>';
+    h += '<div class="form-actions"><button class="btn" onclick="closeModal()">取消</button>';
+    h += '<button class="btn btn-primary" onclick="saveUser(' + (u ? u.id : 0) + ')">保存</button></div>';
+    renderModal(title, h);
+  };
+
+  window.saveUser = function (id) {
+    var username = document.getElementById('fname').value.trim();
+    var nickname = document.getElementById('fnick').value.trim();
+    var role = document.getElementById('frole').value;
+    if (!username || !nickname) { showToast('请填写用户名和昵称', 'error'); return; }
+    if (id) {
+      var u = findById(DATA.users, id);
+      if (u) { u.username = username; u.nickname = nickname; u.role = role; }
+    } else {
+      DATA.users.push({
+        id: DATA.users.length + 1,
+        username: username, password: '123456',
+        nickname: nickname, avatar: '😊', role: role,
+        createdAt: new Date().toISOString().slice(0, 10)
+      });
+    }
+    closeModal(); renderTab(); showToast('保存成功', 'success');
+  };
+
+  window.deleteUser = function (id) {
+    DATA.users = DATA.users.filter(function (u) { return u.id !== id; });
+    renderTab(); showToast('已删除', 'info');
+  };
+
+  /* Helper */
+  function findById(arr, id) {
+    for (var i = 0; i < arr.length; i++) { if (arr[i].id === id) return arr[i]; }
+    return null;
+  }
+})();
+</script>
+</body>
+</html>
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/css/style.css b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/css/style.css
new file mode 100644
index 0000000..68e900e
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/css/style.css
@@ -0,0 +1,761 @@
+/* ==================== CSS Variables & Reset ==================== */
+:root {
+  --primary: #6366f1;
+  --primary-hover: #4f46e5;
+  --primary-light: #eef2ff;
+  --primary-soft: #e0e7ff;
+  --success: #10b981;
+  --warning: #f59e0b;
+  --danger: #ef4444;
+  --danger-hover: #dc2626;
+  --bg: #f8fafc;
+  --bg-card: #ffffff;
+  --bg-hover: #f1f5f9;
+  --text: #0f172a;
+  --text-secondary: #64748b;
+  --text-muted: #94a3b8;
+  --border: #e2e8f0;
+  --border-light: #f1f5f9;
+  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
+  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
+  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
+  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
+  --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);
+  --radius-sm: 8px;
+  --radius: 12px;
+  --radius-lg: 16px;
+  --radius-xl: 20px;
+  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+  --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+* { margin: 0; padding: 0; box-sizing: border-box; }
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
+  background: var(--bg);
+  color: var(--text);
+  line-height: 1.6;
+  min-height: 100vh;
+  -webkit-font-smoothing: antialiased;
+}
+
+a { text-decoration: none; color: inherit; }
+button { cursor: pointer; font-family: inherit; border: none; outline: none; }
+input, textarea, select { font-family: inherit; outline: none; }
+
+/* ==================== Animations ==================== */
+@keyframes fadeInUp {
+  from { opacity: 0; transform: translateY(24px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+@keyframes fadeIn {
+  from { opacity: 0; }
+  to { opacity: 1; }
+}
+@keyframes fadeInScale {
+  from { opacity: 0; transform: scale(0.95); }
+  to { opacity: 1; transform: scale(1); }
+}
+@keyframes slideInLeft {
+  from { opacity: 0; transform: translateX(-20px); }
+  to { opacity: 1; transform: translateX(0); }
+}
+@keyframes slideInRight {
+  from { opacity: 0; transform: translateX(20px); }
+  to { opacity: 1; transform: translateX(0); }
+}
+@keyframes float {
+  0%, 100% { transform: translateY(0); }
+  50% { transform: translateY(-8px); }
+}
+@keyframes pulse {
+  0%, 100% { opacity: 1; }
+  50% { opacity: 0.6; }
+}
+
+.anim-fade-up { animation: fadeInUp 0.6s cubic-bezier(0.4,0,0.2,1) both; }
+.anim-fade-up-d1 { animation-delay: 0.05s; }
+.anim-fade-up-d2 { animation-delay: 0.1s; }
+.anim-fade-up-d3 { animation-delay: 0.15s; }
+.anim-fade-up-d4 { animation-delay: 0.2s; }
+.anim-fade-up-d5 { animation-delay: 0.25s; }
+.anim-fade-up-d6 { animation-delay: 0.3s; }
+.anim-scale-in { animation: fadeInScale 0.3s cubic-bezier(0.4,0,0.2,1) both; }
+
+/* ==================== Navbar ==================== */
+.navbar {
+  position: sticky; top: 0; z-index: 100;
+  background: rgba(255,255,255,0.85);
+  backdrop-filter: blur(20px);
+  -webkit-backdrop-filter: blur(20px);
+  border-bottom: 1px solid var(--border);
+  padding: 0 2rem;
+  height: 64px;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+}
+
+.navbar-brand {
+  font-size: 1.5rem; font-weight: 800;
+  background: linear-gradient(135deg, var(--primary), #8b5cf6);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  display: flex; align-items: center; gap: 0.5rem;
+}
+
+.logo-icon {
+  width: 36px; height: 36px;
+  background: linear-gradient(135deg, var(--primary), #8b5cf6);
+  border-radius: var(--radius-sm);
+  display: flex; align-items: center; justify-content: center;
+  font-size: 1.2rem;
+  -webkit-text-fill-color: white;
+}
+
+.navbar-actions {
+  display: flex; align-items: center; gap: 0.75rem;
+}
+
+/* ==================== Buttons ==================== */
+.btn {
+  padding: 0.5rem 1.25rem; border-radius: var(--radius-sm);
+  font-size: 0.9rem; font-weight: 600;
+  transition: all var(--transition);
+  display: inline-flex; align-items: center; gap: 0.4rem;
+}
+
+.btn-primary {
+  background: linear-gradient(135deg, var(--primary), #8b5cf6);
+  color: white;
+  box-shadow: 0 2px 8px rgba(99,102,241,0.3);
+}
+.btn-primary:hover {
+  transform: translateY(-1px);
+  box-shadow: 0 4px 14px rgba(99,102,241,0.4);
+}
+
+.btn-outline {
+  background: transparent; color: var(--primary);
+  border: 2px solid var(--primary-soft);
+}
+.btn-outline:hover {
+  background: var(--primary-light); border-color: var(--primary);
+}
+
+.btn-ghost {
+  background: transparent; color: var(--text-secondary);
+}
+.btn-ghost:hover { background: var(--bg-hover); color: var(--text); }
+
+.btn-sm { padding: 0.35rem 0.85rem; font-size: 0.8rem; }
+.btn-danger { background: var(--danger); color: white; }
+.btn-danger:hover { background: var(--danger-hover); transform: translateY(-1px); }
+.btn-success { background: var(--success); color: white; }
+.btn-success:hover { opacity: 0.9; transform: translateY(-1px); }
+.btn-warning { background: var(--warning); color: white; }
+
+/* ==================== User Menu ==================== */
+.user-avatar {
+  width: 36px; height: 36px; border-radius: 50%;
+  background: linear-gradient(135deg, var(--primary), #8b5cf6);
+  color: white;
+  display: flex; align-items: center; justify-content: center;
+  font-weight: 700; font-size: 0.9rem;
+}
+
+.user-menu {
+  display: flex; align-items: center; gap: 0.5rem;
+  padding: 0.3rem 0.85rem; border-radius: 100px;
+  cursor: pointer; transition: var(--transition); position: relative;
+}
+.user-menu:hover { background: var(--bg-hover); }
+
+.user-dropdown {
+  position: absolute; top: calc(100% + 8px); right: 0;
+  background: var(--bg-card); border-radius: var(--radius);
+  box-shadow: var(--shadow-xl); border: 1px solid var(--border);
+  min-width: 180px; padding: 0.5rem;
+  animation: fadeInScale 0.2s ease both;
+  display: none; z-index: 50;
+}
+.user-dropdown.show { display: block; }
+.user-dropdown a {
+  display: flex; align-items: center; gap: 0.5rem;
+  padding: 0.6rem 0.85rem; border-radius: var(--radius-sm);
+  font-size: 0.9rem; transition: var(--transition);
+}
+.user-dropdown a:hover { background: var(--primary-light); color: var(--primary); }
+.user-dropdown .divider { height: 1px; background: var(--border); margin: 0.25rem 0; }
+
+/* ==================== Layout ==================== */
+.container { max-width: 1280px; margin: 0 auto; padding: 2rem; }
+.main-content { display: flex; gap: 2rem; }
+
+/* ==================== Sidebar ==================== */
+.sidebar {
+  width: 260px; flex-shrink: 0;
+  position: sticky; top: 88px; height: fit-content;
+  animation: slideInLeft 0.5s ease both;
+}
+
+.category-panel {
+  background: var(--bg-card); border-radius: var(--radius-lg);
+  box-shadow: var(--shadow); border: 1px solid var(--border);
+  overflow: hidden;
+}
+
+.category-panel-header {
+  padding: 1.25rem 1.25rem 0.75rem;
+  font-weight: 700; font-size: 1rem;
+  display: flex; align-items: center; gap: 0.5rem;
+}
+
+.category-list {
+  list-style: none; padding: 0 0.5rem 0.75rem;
+}
+
+.category-item { margin: 0.15rem 0; }
+
+.category-item a {
+  display: flex; align-items: center; justify-content: space-between;
+  padding: 0.65rem 0.85rem; border-radius: var(--radius-sm);
+  font-size: 0.9rem; transition: all var(--transition);
+  color: var(--text-secondary); cursor: pointer;
+}
+.category-item a:hover,
+.category-item a.active {
+  background: var(--primary-light); color: var(--primary); font-weight: 600;
+}
+
+.category-item .count {
+  background: var(--border-light); padding: 0.15rem 0.55rem;
+  border-radius: 100px; font-size: 0.75rem; font-weight: 600;
+  color: var(--text-muted);
+}
+.category-item a.active .count {
+  background: var(--primary-soft); color: var(--primary);
+}
+
+/* ==================== Content Area ==================== */
+.content-area { flex: 1; min-width: 0; }
+
+.content-header {
+  display: flex; align-items: center; justify-content: space-between;
+  margin-bottom: 1.5rem;
+  animation: fadeInUp 0.5s ease both;
+}
+.content-header h2 { font-size: 1.5rem; font-weight: 700; }
+
+.search-box { position: relative; }
+.search-box input {
+  padding: 0.55rem 1rem 0.55rem 2.5rem;
+  border: 2px solid var(--border); border-radius: 100px;
+  font-size: 0.9rem; width: 260px;
+  transition: all var(--transition); background: var(--bg-card);
+}
+.search-box input:focus {
+  border-color: var(--primary); box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
+  width: 300px;
+}
+.search-box .search-icon {
+  position: absolute; left: 0.85rem; top: 50%;
+  transform: translateY(-50%);
+  color: var(--text-muted); font-size: 0.9rem;
+}
+
+/* ==================== Notes Grid ==================== */
+.notes-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
+  gap: 1.25rem;
+}
+
+.note-card {
+  display: block;
+  background: var(--bg-card); border-radius: var(--radius-lg);
+  border: 1px solid var(--border); padding: 1.5rem;
+  transition: all var(--transition-slow);
+  cursor: pointer; position: relative; overflow: hidden;
+  animation: fadeInUp 0.5s ease both;
+  color: inherit;
+  text-decoration: none;
+}
+.note-card:hover {
+  transform: translateY(-4px);
+  box-shadow: var(--shadow-xl);
+  border-color: var(--primary-soft);
+}
+.note-card::before {
+  content: ''; position: absolute; top: 0; left: 0; right: 0;
+  height: 3px;
+  background: linear-gradient(90deg, var(--primary), #8b5cf6, #a78bfa);
+  transform: scaleX(0); transform-origin: left;
+  transition: transform var(--transition-slow);
+}
+.note-card:hover::before { transform: scaleX(1); }
+
+.note-category {
+  display: inline-flex; align-items: center; gap: 0.3rem;
+  padding: 0.2rem 0.7rem; border-radius: 100px;
+  font-size: 0.75rem; font-weight: 600; margin-bottom: 0.75rem;
+}
+
+.note-title {
+  font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem;
+  line-height: 1.4;
+  display: -webkit-box;
+  -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
+}
+
+.note-excerpt {
+  color: var(--text-secondary); font-size: 0.88rem;
+  line-height: 1.6; margin-bottom: 1rem;
+  display: -webkit-box;
+  -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
+}
+
+.note-meta {
+  display: flex; align-items: center; justify-content: space-between;
+  font-size: 0.8rem; color: var(--text-muted);
+  padding-top: 0.75rem; border-top: 1px solid var(--border-light);
+}
+.note-meta span { display: flex; align-items: center; gap: 0.3rem; }
+
+/* ==================== Note Detail Modal ==================== */
+.note-detail-overlay {
+  position: fixed; inset: 0;
+  background: rgba(15,23,42,0.5); backdrop-filter: blur(4px);
+  z-index: 200;
+  display: flex; align-items: center; justify-content: center;
+  animation: fadeIn 0.2s ease both;
+}
+
+.note-detail {
+  background: var(--bg-card); border-radius: var(--radius-xl);
+  width: 90%; max-width: 750px; max-height: 90vh; overflow-y: auto;
+  box-shadow: var(--shadow-xl);
+  animation: fadeInScale 0.3s ease both;
+}
+
+.note-detail-header {
+  padding: 1.5rem 2rem; border-bottom: 1px solid var(--border);
+  display: flex; align-items: center; justify-content: space-between;
+  position: sticky; top: 0; background: var(--bg-card); z-index: 1;
+  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
+}
+.note-detail-header h3 { font-size: 1.3rem; }
+
+.note-detail-close {
+  width: 36px; height: 36px; border-radius: 50%;
+  display: flex; align-items: center; justify-content: center;
+  background: var(--bg-hover); font-size: 1.2rem;
+  transition: var(--transition); cursor: pointer;
+}
+.note-detail-close:hover { background: var(--border); }
+
+.note-detail-body { padding: 2rem; }
+.note-full-content {
+  font-size: 1rem; line-height: 1.8; white-space: pre-wrap;
+}
+.note-detail-info {
+  display: flex; gap: 1.5rem; margin: 1.25rem 0;
+  padding: 1rem; background: var(--bg);
+  border-radius: var(--radius); font-size: 0.85rem;
+  color: var(--text-secondary);
+}
+
+/* ==================== Comments ==================== */
+.comments-section { padding: 0 2rem 2rem; }
+.comments-section h4 {
+  font-size: 1.1rem; margin-bottom: 1rem;
+  display: flex; align-items: center; gap: 0.5rem;
+}
+
+.comment-form {
+  display: flex; gap: 0.75rem; margin-bottom: 1.5rem;
+}
+.comment-form input {
+  flex: 1; padding: 0.65rem 1rem;
+  border: 2px solid var(--border); border-radius: 100px;
+  font-size: 0.9rem; transition: var(--transition);
+}
+.comment-form input:focus {
+  border-color: var(--primary);
+  box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
+}
+.comment-form button {
+  padding: 0.6rem 1.5rem; border-radius: 100px;
+  background: var(--primary); color: white; font-weight: 600;
+  transition: var(--transition);
+}
+.comment-form button:hover { background: var(--primary-hover); }
+
+.comment-list { list-style: none; display: flex; flex-direction: column; gap: 0.75rem; }
+
+.comment-item {
+  background: var(--bg); padding: 1rem 1.25rem;
+  border-radius: var(--radius);
+  animation: fadeInUp 0.4s ease both;
+  display: flex; gap: 0.75rem;
+}
+
+.comment-avatar {
+  width: 36px; height: 36px; border-radius: 50%;
+  background: linear-gradient(135deg, #a78bfa, #6366f1);
+  color: white;
+  display: flex; align-items: center; justify-content: center;
+  font-weight: 700; font-size: 0.8rem; flex-shrink: 0;
+}
+
+.comment-body { flex: 1; }
+.comment-author { font-weight: 600; font-size: 0.9rem; }
+.comment-time { font-size: 0.75rem; color: var(--text-muted); margin-left: 0.5rem; }
+.comment-text { font-size: 0.88rem; color: var(--text-secondary); margin-top: 0.25rem; }
+
+.comment-actions { display: flex; gap: 0.5rem; margin-top: 0.4rem; }
+.comment-actions button {
+  font-size: 0.75rem; color: var(--text-muted); background: none;
+  padding: 0.2rem 0.5rem; border-radius: 4px; transition: var(--transition);
+}
+.comment-actions button:hover { color: var(--danger); background: #fef2f2; }
+
+/* ==================== Modals ==================== */
+.modal-overlay {
+  position: fixed; inset: 0;
+  background: rgba(15,23,42,0.5); backdrop-filter: blur(4px);
+  z-index: 300;
+  display: flex; align-items: center; justify-content: center;
+  animation: fadeIn 0.2s ease both;
+}
+
+.login-modal {
+  background: var(--bg-card); border-radius: var(--radius-xl);
+  padding: 2.5rem; width: 90%; max-width: 420px;
+  box-shadow: var(--shadow-xl);
+  animation: fadeInScale 0.3s ease both;
+}
+.login-modal h2 { font-size: 1.5rem; text-align: center; margin-bottom: 0.5rem; }
+.login-modal .subtitle {
+  text-align: center; color: var(--text-secondary);
+  font-size: 0.9rem; margin-bottom: 2rem;
+}
+
+.form-group { margin-bottom: 1.25rem; }
+.form-group label {
+  display: block; font-size: 0.85rem; font-weight: 600;
+  margin-bottom: 0.4rem; color: var(--text);
+}
+.form-group input,
+.form-group select,
+.form-group textarea {
+  width: 100%; padding: 0.7rem 1rem;
+  border: 2px solid var(--border); border-radius: var(--radius-sm);
+  font-size: 0.9rem; transition: all var(--transition);
+  background: var(--bg);
+}
+.form-group input:focus,
+.form-group select:focus,
+.form-group textarea:focus {
+  border-color: var(--primary);
+  box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
+}
+.form-group textarea { resize: vertical; min-height: 100px; }
+
+.login-modal .btn-primary { width: 100%; justify-content: center; padding: 0.75rem; }
+.login-hint {
+  text-align: center; margin-top: 1rem;
+  font-size: 0.8rem; color: var(--text-muted);
+}
+
+.form-modal {
+  background: var(--bg-card); border-radius: var(--radius-xl);
+  padding: 2rem; width: 90%; max-width: 520px;
+  box-shadow: var(--shadow-xl);
+  animation: fadeInScale 0.3s ease both;
+  max-height: 85vh; overflow-y: auto;
+}
+.form-modal h3 { margin-bottom: 1.5rem; font-size: 1.2rem; }
+.form-actions { display: flex; gap: 0.75rem; justify-content: flex-end; margin-top: 1.5rem; }
+
+/* ==================== Admin ==================== */
+.admin-layout { display: flex; min-height: calc(100vh - 64px); }
+
+.admin-sidebar {
+  width: 240px; background: var(--bg-card);
+  border-right: 1px solid var(--border);
+  padding: 1.5rem 0;
+  display: flex; flex-direction: column;
+  animation: slideInLeft 0.4s ease both;
+}
+
+.admin-nav-item {
+  display: flex; align-items: center; gap: 0.75rem;
+  padding: 0.75rem 1.5rem; font-size: 0.9rem; font-weight: 500;
+  color: var(--text-secondary); transition: var(--transition);
+  border-left: 3px solid transparent; cursor: pointer;
+}
+.admin-nav-item:hover { background: var(--bg-hover); color: var(--text); }
+.admin-nav-item.active {
+  color: var(--primary); background: var(--primary-light);
+  border-left-color: var(--primary); font-weight: 600;
+}
+
+.admin-main {
+  flex: 1; padding: 2rem; overflow-y: auto;
+  animation: fadeInUp 0.5s ease both;
+}
+
+.admin-panel {
+  background: var(--bg-card); border-radius: var(--radius-lg);
+  box-shadow: var(--shadow); border: 1px solid var(--border);
+  overflow: hidden;
+}
+
+.admin-panel-header {
+  padding: 1.25rem 1.5rem; border-bottom: 1px solid var(--border);
+  display: flex; align-items: center; justify-content: space-between;
+}
+.admin-panel-header h3 { font-size: 1.1rem; }
+.admin-panel-body { padding: 1.5rem; }
+
+.admin-table { width: 100%; border-collapse: collapse; }
+.admin-table th {
+  text-align: left; padding: 0.75rem 1rem;
+  font-size: 0.8rem; font-weight: 700; color: var(--text-muted);
+  text-transform: uppercase; letter-spacing: 0.05em;
+  background: var(--bg); border-bottom: 2px solid var(--border);
+}
+.admin-table td {
+  padding: 0.85rem 1rem; font-size: 0.9rem;
+  border-bottom: 1px solid var(--border-light);
+}
+.admin-table tbody tr { transition: var(--transition); }
+.admin-table tbody tr:hover { background: var(--bg-hover); }
+.admin-table .actions { display: flex; gap: 0.4rem; }
+
+.badge {
+  display: inline-flex; padding: 0.2rem 0.6rem;
+  border-radius: 100px; font-size: 0.75rem; font-weight: 600;
+}
+.badge-admin { background: #fef3c7; color: #d97706; }
+.badge-user { background: #e0e7ff; color: #4f46e5; }
+.badge-category { background: #d1fae5; color: #059669; }
+
+/* ==================== Admin Tabs ==================== */
+.admin-header {
+  text-align: center; padding: 2rem 0 1.5rem;
+  animation: fadeInUp 0.5s ease both;
+}
+.admin-header h1 { font-size: 1.8rem; font-weight: 800; }
+
+.admin-tabs {
+  display: flex; gap: 0.5rem; margin-bottom: 2rem;
+  background: var(--bg-card); padding: 0.4rem;
+  border-radius: var(--radius); border: 1px solid var(--border);
+  animation: fadeInUp 0.5s 0.05s ease both;
+}
+
+.admin-tab {
+  flex: 1; padding: 0.7rem 1rem; border-radius: var(--radius-sm);
+  font-size: 0.88rem; font-weight: 600; color: var(--text-secondary);
+  background: transparent; transition: all var(--transition);
+  cursor: pointer; border: none; text-align: center;
+}
+.admin-tab:hover { color: var(--text); background: var(--bg-hover); }
+.admin-tab.active {
+  color: white;
+  background: linear-gradient(135deg, var(--primary), #8b5cf6);
+  box-shadow: var(--shadow-sm);
+}
+
+/* ==================== Admin Section ==================== */
+.section-header {
+  display: flex; align-items: center; justify-content: space-between;
+  margin-bottom: 1.25rem;
+}
+.section-header h2 { font-size: 1.2rem; font-weight: 700; }
+
+.data-table {
+  background: var(--bg-card); border-radius: var(--radius-lg);
+  box-shadow: var(--shadow); border: 1px solid var(--border);
+  overflow: hidden;
+  animation: fadeInUp 0.4s ease both;
+}
+.data-table table { width: 100%; border-collapse: collapse; }
+.data-table thead { background: var(--bg); }
+.data-table th {
+  text-align: left; padding: 0.75rem 1rem;
+  font-size: 0.8rem; font-weight: 700; color: var(--text-muted);
+  text-transform: uppercase; letter-spacing: 0.05em;
+  border-bottom: 2px solid var(--border);
+}
+.data-table td {
+  padding: 0.85rem 1rem; font-size: 0.9rem;
+  border-bottom: 1px solid var(--border-light);
+  color: var(--text);
+}
+.data-table tbody tr { transition: var(--transition); }
+.data-table tbody tr:hover { background: var(--bg-hover); }
+.data-table tbody tr:last-child td { border-bottom: none; }
+.data-table .btn { white-space: nowrap; }
+
+.color-dot {
+  display: inline-block; width: 14px; height: 14px;
+  border-radius: 50%; vertical-align: middle; margin-right: 4px;
+  border: 2px solid rgba(0,0,0,0.05);
+}
+
+/* ==================== Back Link ==================== */
+.back-link {
+  display: inline-flex; align-items: center; gap: 0.3rem;
+  color: var(--primary); font-weight: 600; font-size: 0.9rem;
+  margin-bottom: 1.5rem; transition: var(--transition);
+}
+.back-link:hover { color: var(--primary-hover); transform: translateX(-3px); }
+
+/* ==================== Note Detail Page ==================== */
+.note-detail-header {
+  background: var(--bg-card); border-radius: var(--radius-lg);
+  padding: 2rem; border: 1px solid var(--border);
+  animation: fadeInUp 0.5s ease both;
+}
+.note-detail-header h1 { font-size: 1.6rem; font-weight: 800; margin-bottom: 1rem; }
+
+.note-detail-meta {
+  display: flex; flex-wrap: wrap; gap: 1rem; align-items: center;
+  font-size: 0.85rem; color: var(--text-secondary);
+}
+.note-detail-meta span {
+  display: flex; align-items: center; gap: 0.3rem;
+}
+
+.note-detail-body {
+  background: var(--bg-card); border-radius: var(--radius-lg);
+  padding: 2rem; margin-top: 1rem;
+  border: 1px solid var(--border);
+  animation: fadeInUp 0.5s 0.1s ease both;
+}
+.note-detail-body p {
+  font-size: 1rem; line-height: 1.9; white-space: pre-wrap;
+  color: var(--text);
+}
+
+/* ==================== Comment Section (Page) ==================== */
+.comment-section {
+  margin-top: 1.5rem;
+  background: var(--bg-card); border-radius: var(--radius-lg);
+  padding: 2rem; border: 1px solid var(--border);
+  animation: fadeInUp 0.5s 0.15s ease both;
+}
+.comment-section h3 {
+  font-size: 1.1rem; margin-bottom: 1rem;
+  display: flex; align-items: center; gap: 0.5rem;
+}
+.comment-section .comment-item {
+  background: var(--bg); margin-bottom: 0.75rem;
+}
+.comment-section .comment-item:last-child { margin-bottom: 0; }
+
+.comment-meta { margin-bottom: 0.2rem; }
+.comment-meta strong { font-size: 0.9rem; margin-right: 0.5rem; }
+.comment-meta span { font-size: 0.75rem; color: var(--text-muted); }
+
+.comment-form-wrapper {
+  margin-top: 1.5rem; padding-top: 1.5rem;
+  border-top: 1px solid var(--border);
+}
+.comment-form-wrapper h4 {
+  font-size: 1rem; margin-bottom: 0.75rem;
+  display: flex; align-items: center; gap: 0.4rem;
+}
+.comment-form-wrapper .comment-form {
+  display: flex; flex-direction: column; gap: 0.75rem;
+}
+.comment-form-wrapper .form-group { margin-bottom: 0; }
+.comment-form-wrapper .form-group input,
+.comment-form-wrapper .form-group textarea {
+  width: 100%; padding: 0.7rem 1rem;
+  border: 2px solid var(--border); border-radius: var(--radius-sm);
+  font-size: 0.9rem; transition: all var(--transition);
+  background: var(--bg);
+}
+.comment-form-wrapper .form-group input:focus,
+.comment-form-wrapper .form-group textarea:focus {
+  border-color: var(--primary);
+  box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
+}
+.comment-form-wrapper .btn-primary { align-self: flex-start; }
+
+/* ==================== Toast ==================== */
+.toast-container {
+  position: fixed; top: 1.5rem; right: 1.5rem; z-index: 9999;
+  display: flex; flex-direction: column; gap: 0.5rem;
+}
+
+.toast {
+  padding: 0.85rem 1.25rem; background: var(--bg-card);
+  border-radius: var(--radius); box-shadow: var(--shadow-lg);
+  font-size: 0.9rem; font-weight: 500;
+  animation: slideInRight 0.3s ease both;
+  display: flex; align-items: center; gap: 0.5rem;
+  border-left: 4px solid;
+}
+.toast-success { border-left-color: var(--success); }
+.toast-error { border-left-color: var(--danger); }
+.toast-info { border-left-color: var(--primary); }
+
+/* ==================== Empty State ==================== */
+.empty-state {
+  text-align: center; padding: 3rem 2rem; color: var(--text-muted);
+}
+.empty-state .empty-icon { font-size: 3.5rem; margin-bottom: 1rem; animation: float 3s ease-in-out infinite; }
+.empty-state p { font-size: 0.95rem; }
+
+/* ==================== Hero Section ==================== */
+.hero {
+  text-align: center; padding: 3rem 2rem;
+  background: linear-gradient(135deg, #eef2ff 0%, #faf5ff 50%, #f0f9ff 100%);
+  border-radius: var(--radius-xl); margin-bottom: 2rem;
+  animation: fadeInUp 0.6s ease both;
+}
+.hero h1 {
+  font-size: 2.2rem; font-weight: 800;
+  background: linear-gradient(135deg, var(--primary), #8b5cf6);
+  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
+  margin-bottom: 0.75rem;
+}
+.hero p { color: var(--text-secondary); font-size: 1.05rem; max-width: 500px; margin: 0 auto; }
+
+/* ==================== Responsive ==================== */
+@media (max-width: 768px) {
+  .main-content { flex-direction: column; }
+  .sidebar { width: 100%; position: static; }
+  .category-list { display: flex; flex-wrap: wrap; gap: 0.5rem; }
+  .category-item a { padding: 0.4rem 0.7rem; font-size: 0.8rem; }
+  .notes-grid { grid-template-columns: 1fr; }
+  .admin-layout { flex-direction: column; }
+  .admin-sidebar {
+    width: 100%; flex-direction: row; overflow-x: auto;
+    padding: 0.75rem; border-right: none; border-bottom: 1px solid var(--border);
+  }
+  .admin-nav-item {
+    border-left: none; border-bottom: 2px solid transparent;
+    white-space: nowrap; padding: 0.5rem 1rem;
+  }
+  .admin-nav-item.active { border-left-color: transparent; border-bottom-color: var(--primary); }
+  .admin-main { padding: 1rem; }
+  .navbar { padding: 0 1rem; }
+  .container { padding: 1rem; }
+  .hero { padding: 2rem 1rem; }
+  .hero h1 { font-size: 1.6rem; }
+  .search-box input { width: 180px; }
+  .search-box input:focus { width: 220px; }
+}
+
+/* Scrollbar */
+::-webkit-scrollbar { width: 6px; }
+::-webkit-scrollbar-track { background: transparent; }
+::-webkit-scrollbar-thumb { background: var(--border); border-radius: 100px; }
+::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/function/db.php b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/function/db.php
new file mode 100644
index 0000000..18cfed2
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/function/db.php
@@ -0,0 +1,10 @@
+<?php
+// 数据库连接配置
+$dbhost = "127.0.0.1";
+$dbuser = "root";
+$dbpass = "123456";
+$dbname = "site03";
+$dbport = "3306";
+$dbcharset = "utf8";
+$conn = mysqli_connect($dbhost, $dbuser, $dbpass, $dbname, $dbport, $dbcharset) or exit('连接失败');
+?>
\ No newline at end of file
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/function/user.php b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/function/user.php
new file mode 100644
index 0000000..465e23f
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/function/user.php
@@ -0,0 +1,57 @@
+<?php
+// 接受数据，并且提取出action
+$data = json_decode(file_get_contents('php://input'), true);
+$action = $data['action'] ?? '';
+
+// 处理与用户相关的操作
+include 'db.php';
+
+// 如果数据库连接失败，则返回错误信息
+/** @var mysqli $conn */
+if (!isset($conn)) {
+    echo json_encode(['code' => 10004, 'status' => 'error', 'message' => '数据库连接失败']);
+    exit;
+}
+
+// 测试用户名是否已存在
+function testUsername(mysqli $conn, string $username): bool
+{
+    $sql = "select * from users where username = '$username'"; // sql注入风险
+    $result = mysqli_query($conn, $sql);
+    if (mysqli_num_rows($result) > 0) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
+// 如果action是register，则注册用户
+if ($action == 'register') {
+    $username = $data['username'];
+    $password = $data['password'];
+    $email = $data['email'];
+    if (testUsername($conn, $username)) {
+        echo json_encode(['code' => 10001, 'status' => 'error', 'message' => '用户名已存在']);
+    } else {
+        $sql = "insert into users (username, password, email) values ('$username', '$password', '$email')";
+        $result = mysqli_query($conn, $sql);
+        if ($result) {
+            echo json_encode(['code' => 0, 'status' => 'success', 'message' => '注册成功']);
+        } else {
+            echo json_encode(['code' => 10002, 'status' => 'error', 'message' => '注册失败']);
+        }
+    }
+}
+
+// login的逻辑
+if ($action == 'login') {
+    $username = $data['username'];
+    $password = $data['password'];
+    $sql = "select * from users where username = '$username' and password = '$password'";
+    $result = mysqli_query($conn, $sql);
+    if (mysqli_num_rows($result) > 0) {
+        echo json_encode(['code' => 0, 'status' => 'success', 'message' => '登录成功']);
+    } else {
+        echo json_encode(['code' => 10003, 'status' => 'error', 'message' => '用户名或密码错误']);
+    }
+}
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/index.html b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/index.html
new file mode 100644
index 0000000..8fe568d
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/index.html
@@ -0,0 +1,126 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>笔记小站 - 发现精彩内容</title>
+<link rel="stylesheet" href="css/style.css">
+</head>
+<body>
+
+<nav class="navbar">
+  <a class="navbar-brand" href="index.html">
+    <span class="logo-icon">📝</span>
+    笔记小站
+  </a>
+  <div class="navbar-actions" id="navbarActions"></div>
+</nav>
+
+<div class="container">
+
+  <!-- Hero -->
+  <div class="hero">
+    <h1>📝 发现精彩内容</h1>
+    <p>分享技术、记录生活、沉淀思考——这里有你想看的一切</p>
+  </div>
+
+  <div class="main-content">
+
+    <!-- Sidebar: Categories -->
+    <aside class="sidebar">
+      <div class="category-panel">
+        <div class="category-panel-header">📂 笔记分类</div>
+        <ul class="category-list" id="categoryList"></ul>
+      </div>
+    </aside>
+
+    <!-- Content: Notes Grid -->
+    <main class="content-area">
+      <div class="content-header">
+        <h2 id="sectionTitle">📋 全部笔记</h2>
+        <div class="search-box">
+          <span class="search-icon">🔍</span>
+          <input type="text" id="searchInput" placeholder="搜索笔记..." value="">
+        </div>
+      </div>
+      <div class="notes-grid" id="notesGrid"></div>
+    </main>
+
+  </div>
+</div>
+
+<div class="toast-container" id="toastContainer"></div>
+
+<script src="js/data.js"></script>
+<script src="js/common.js"></script>
+<script>
+(function () {
+
+var catId = getUrlParam('cat') ? parseInt(getUrlParam('cat')) : null;
+
+function renderCategoryList() {
+  var counts = {};
+  DATA.notes.forEach(function (n) { counts[n.categoryId] = (counts[n.categoryId] || 0) + 1; });
+
+  function buildLink(id, icon, name, count) {
+    var active = catId === id ? ' active' : '';
+    return '<li class="category-item"><a class="' + active + '" href="index.html' + (id ? '?cat=' + id : '') + '">' +
+      '<span>' + icon + ' ' + name + '</span><span class="count">' + count + '</span></a></li>';
+  }
+
+  var html = buildLink(null, '📋', '全部笔记', DATA.notes.length);
+  DATA.categories.forEach(function (c) {
+    html += buildLink(c.id, c.icon, c.name, counts[c.id] || 0);
+  });
+  document.getElementById('categoryList').innerHTML = html;
+}
+
+function renderNotes() {
+  var cat = catId ? DATA.categories.find(function (c) { return c.id === catId; }) : null;
+  var q = (document.getElementById('searchInput').value || '').toLowerCase();
+
+  var notes = DATA.notes.filter(function (n) {
+    if (catId && n.categoryId !== catId) return false;
+    if (q && n.title.toLowerCase().indexOf(q) === -1 && n.excerpt.toLowerCase().indexOf(q) === -1 && n.content.toLowerCase().indexOf(q) === -1) return false;
+    return true;
+  });
+
+  document.getElementById('sectionTitle').textContent = cat ? cat.icon + ' ' + cat.name : '📋 全部笔记';
+
+  if (notes.length === 0) {
+    document.getElementById('notesGrid').innerHTML = emptyState('📭', '暂无笔记内容');
+    return;
+  }
+
+  var delays = ['anim-fade-up-d1', 'anim-fade-up-d2', 'anim-fade-up-d3', 'anim-fade-up-d4', 'anim-fade-up-d5', 'anim-fade-up-d6'];
+  document.getElementById('notesGrid').innerHTML = notes.map(function (n, i) {
+    var c = DATA.categories.find(function (x) { return x.id === n.categoryId; });
+    var cc = DATA.comments.filter(function (x) { return x.noteId === n.id; }).length;
+    return '<a href="note.html?id=' + n.id + '" class="note-card anim-fade-up ' + delays[i % 6] + '">' +
+      categoryBadge(c) +
+      '<h3 class="note-title">' + n.title + '</h3>' +
+      '<p class="note-excerpt">' + n.excerpt + '</p>' +
+      '<div class="note-meta"><span>👤 ' + n.authorName + '</span><span>👁️ ' + n.views + '</span><span>💬 ' + cc + '</span><span>❤️ ' + n.likes + '</span></div>' +
+    '</a>';
+  }).join('');
+}
+
+renderCategoryList();
+renderNotes();
+
+var searchInput = document.getElementById('searchInput');
+if (searchInput) {
+  var timer;
+  searchInput.addEventListener('input', function () {
+    clearTimeout(timer);
+    timer = setTimeout(renderNotes, 200);
+  });
+  searchInput.addEventListener('keydown', function (e) {
+    if (e.key === 'Escape') { this.value = ''; renderNotes(); }
+  });
+}
+
+})();
+</script>
+</body>
+</html>
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/js/common.js b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/js/common.js
new file mode 100644
index 0000000..1c5fbd5
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/js/common.js
@@ -0,0 +1,61 @@
+/* ==================== Shared Utilities ==================== */
+
+/* URL parameter helper */
+function getUrlParam(name) {
+  const url = new URL(window.location.href);
+  return url.searchParams.get(name);
+}
+
+/* Toast notification */
+function showToast(msg, type) {
+  type = type || 'info';
+  var icons = { success: '✅', error: '❌', info: 'ℹ️' };
+  var container = document.getElementById('toastContainer');
+  if (!container) { container = document.createElement('div'); container.id = 'toastContainer'; container.className = 'toast-container'; document.body.appendChild(container); }
+  var t = document.createElement('div');
+  t.className = 'toast toast-' + type;
+  t.innerHTML = '<span>' + (icons[type] || '') + '</span> ' + msg;
+  container.appendChild(t);
+  setTimeout(function () { t.remove(); }, 3000);
+}
+
+/* Render shared navbar */
+function renderNavbar() {
+  var nav = document.getElementById('navbarActions');
+  if (!nav) return;
+  nav.innerHTML =
+    '<a href="index.html" class="btn btn-ghost">🏠 首页</a>' +
+    '<a href="admin.html" class="btn btn-outline btn-sm">⚙️ 后台管理</a>' +
+    '<a href="register.html" class="btn btn-ghost btn-sm">✍️ 注册</a>' +
+    '<a href="login.html" class="btn btn-primary btn-sm">🔑 登录</a>';
+}
+
+/* Category badge helper */
+function categoryBadge(cat) {
+  if (!cat) return '';
+  return '<span class="note-category" style="background:' + cat.color + '15;color:' + cat.color + '">' + cat.icon + ' ' + cat.name + '</span>';
+}
+
+/* Empty state helper */
+function emptyState(icon, text) {
+  return '<div class="empty-state"><div class="empty-icon">' + icon + '</div><p>' + text + '</p></div>';
+}
+
+/* Modal helpers */
+function renderModal(title, content) {
+  var div = document.createElement('div');
+  div.className = 'modal-overlay';
+  div.onclick = function (e) { if (e.target === div) closeModal(); };
+  div.innerHTML = '<div class="form-modal" onclick="event.stopPropagation()"><h3>' + title + '</h3>' + content + '</div>';
+  document.body.appendChild(div);
+}
+
+function closeModal() {
+  var o = document.querySelector('.modal-overlay');
+  if (o) o.remove();
+}
+
+/* ==================== Bootstrap on every page ==================== */
+document.addEventListener('DOMContentLoaded', function () {
+  renderNavbar();
+});
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/js/data.js b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/js/data.js
new file mode 100644
index 0000000..75dd23a
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/js/data.js
@@ -0,0 +1,37 @@
+/* ==================== Mock Data Store ==================== */
+const DATA = {
+  users: [
+    { id: 1, username: 'admin', password: 'admin123', nickname: '管理员', role: 'admin', avatar: '👑', createdAt: '2024-01-01' },
+    { id: 2, username: 'xiaoming', password: '123456', nickname: '小明', role: 'user', avatar: '😊', createdAt: '2024-03-15' },
+    { id: 3, username: 'xiaohong', password: '123456', nickname: '小红', role: 'user', avatar: '🌸', createdAt: '2024-05-20' },
+  ],
+  categories: [
+    { id: 1, name: '技术笔记', icon: '💻', color: '#6366f1' },
+    { id: 2, name: '生活随笔', icon: '🌿', color: '#10b981' },
+    { id: 3, name: '读书心得', icon: '📚', color: '#f59e0b' },
+    { id: 4, name: '旅行记录', icon: '✈️', color: '#06b6d4' },
+  ],
+  notes: [
+    { id: 1, categoryId: 1, title: 'JavaScript 异步编程完全指南', excerpt: '掌握 Promise、async/await 和异步错误处理，让你的 JavaScript 代码更加优雅高效。', content: '在现代 JavaScript 开发中，异步编程是每个开发者必须掌握的技能。\n\n## Promise\nPromise 是 ES6 引入的一种异步编程解决方案。它代表一个异步操作的最终完成或失败。\n\n## async/await\nasync/await 是 ES2017 引入的语法糖，让异步代码看起来像同步代码。使用 try/catch 来处理异步错误比 .catch() 链更清晰易读。\n\n## 并发控制\n使用 Promise.all() 可以同时发起多个请求，显著提升性能。但需要注意控制并发数量。', authorId: 1, authorName: '管理员', views: 1520, likes: 89, createdAt: '2025-08-10' },
+    { id: 2, categoryId: 1, title: 'CSS Grid 布局实战技巧', excerpt: '从基础到进阶，深入了解 CSS Grid 布局系统，掌握现代网页布局的核心技术。', content: 'CSS Grid 是二维布局系统，让我们能同时控制行和列。\n\n## 容器属性\n- grid-template-columns：定义列\n- grid-template-rows：定义行\n- gap：行列间距\n- grid-template-areas：命名区域\n\n## 项目属性\n- grid-column：控制列跨度\n- grid-row：控制行跨度\n\n使用 Grid 可以轻松实现自适应布局，告别传统 hack 方案。', authorId: 1, authorName: '管理员', views: 980, likes: 56, createdAt: '2025-08-08' },
+    { id: 3, categoryId: 2, title: '周末烘焙日记：自制法式可颂', excerpt: '金黄酥脆、层次分明的法式可颂，一次成功的家庭烘焙体验全记录。', content: '这周末终于尝试了心心念念的法式可颂！\n\n## 材料准备\n- 高筋面粉 250g\n- 黄油 150g（裹入用）\n- 酵母 5g / 糖 25g / 盐 5g / 温水 130ml\n\n## 步骤\n1. 和面：将面粉、糖、盐、酵母混合，加入温水揉成光滑面团\n2. 一次发酵：室温发酵 1 小时至 2 倍大\n3. 裹黄油：将面团擀开，放入黄油片，进行四折\n4. 冷藏松弛：每次折叠后冷藏 30 分钟\n5. 成型烘烤：切成三角形卷起，200°C 烤 18 分钟\n\n成品金黄酥脆，层次分明，配上一杯拿铁，完美的周末下午！', authorId: 2, authorName: '小明', views: 756, likes: 134, createdAt: '2025-08-06' },
+    { id: 4, categoryId: 3, title: '《人类简史》读书笔记', excerpt: '认知革命、农业陷阱与科学革命——重新审视人类文明的演进与代价。', content: '尤瓦尔·赫拉利的《人类简史》是一本让人重新思考人类文明的书。\n\n## 认知革命\n大约 7 万年前，智人出现了新的思维和沟通方式。语言不仅能描述现实，还能创造虚构的故事，让大规模合作成为可能。\n\n## 农业革命\n农业革命并非人类的进步，而是一个陷阱。农民的生活比狩猎采集者更辛苦，但人口增长让人无法回头。\n\n## 科学革命\n现代科学与帝国、资本主义的结合，创造了今天的世界。科学的核心是"承认无知"，正是这种谦逊推动了进步。\n\n## 感想\n我们所谓的进步，到底让谁受益？这是个值得深思的问题。', authorId: 3, authorName: '小红', views: 2340, likes: 267, createdAt: '2025-08-04' },
+    { id: 5, categoryId: 1, title: 'React Hooks 深入解析', excerpt: '从 useState 到自定义 Hook，全面解析 React Hooks 的使用场景与最佳实践。', content: 'React Hooks 是 React 16.8 引入的革命性特性。\n\n## useState\n最基础的 Hook，用于在函数组件中添加状态。\n\n## useEffect\n处理副作用的神器。可以用来做数据获取、订阅、DOM 操作等。记得返回清理函数。\n\n## useCallback & useMemo\n性能优化的关键。useCallback 缓存函数，useMemo 缓存计算结果。\n\n## 自定义 Hook\n封装可复用的逻辑，是 Hooks 最强大的特性之一。', authorId: 1, authorName: '管理员', views: 1890, likes: 145, createdAt: '2025-08-02' },
+    { id: 6, categoryId: 4, title: '京都红叶季旅行攻略', excerpt: '岚山竹林、清水寺夜枫、永观堂红叶——京都最美的秋日体验全记录。', content: '十一月的京都，是一年中最美的季节。\n\n## 推荐赏枫地点\n### 岚山\n天龙寺的庭院和竹林小径是最佳拍照地，建议清晨前往避开人群。\n\n### 清水寺\n站在清水舞台上俯瞰京都市区，红叶与古建筑交相辉映。\n\n### 永观堂\n被誉为"红叶的永观堂"，夜枫尤其惊艳。\n\n## 交通建议\n购买京都巴士一日券，500日元即可无限次乘坐。\n\n## 美食推荐\n- 抹茶甜品：中村藤吉\n- 汤豆腐：南禅寺顺正\n- 拉面：一兰拉面', authorId: 2, authorName: '小明', views: 2100, likes: 320, createdAt: '2025-07-28' },
+    { id: 7, categoryId: 2, title: '阳台花园养成记', excerpt: '在城市阳台打造迷你花园，多肉、薄荷、月季——用绿植治愈生活。', content: '在城市的钢筋水泥中，拥有一个属于自己的小花园，是治愈生活最好的方式。\n\n## 适合阳台的植物\n- 多肉植物：耐旱好养，品种丰富\n- 薄荷：清香怡人，还能泡茶\n- 月季：阳台也能开花不断\n- 绿萝：垂吊种植，不占空间\n\n## 养护心得\n每天早晚浇水时，观察植物的变化是最治愈的时刻。看着新芽冒出、花苞绽放，生活的小确幸就在这些细微之处。', authorId: 3, authorName: '小红', views: 645, likes: 89, createdAt: '2025-07-25' },
+    { id: 8, categoryId: 3, title: '《设计心理学》核心要点', excerpt: '可视性、反馈、映射——六个核心原则，打造用户友好的产品设计。', content: '唐纳德·诺曼的《设计心理学》是每个产品设计师的必读书。\n\n## 六大核心原则\n1. 可视性 - 功能要能被看见\n2. 反馈 - 每个操作都要有反馈\n3. 约束 - 物理、文化、逻辑约束\n4. 映射 - 控制与效果的关系\n5. 一致性 - 统一的设计语言\n6. 容错性 - 允许犯错并方便恢复\n\n## 人本设计\n好的设计应该是"不可见"的——它如此自然，以至于用户感觉不到设计的存在。', authorId: 1, authorName: '管理员', views: 1200, likes: 178, createdAt: '2025-07-20' },
+  ],
+  comments: [
+    { id: 1, noteId: 1, userId: 2, userName: '小明', userAvatar: '😊', content: '写得太清晰了！Promise 那部分解决了我的疑惑。', createdAt: '2025-08-11 14:30' },
+    { id: 2, noteId: 1, userId: 3, userName: '小红', userAvatar: '🌸', content: 'async/await 示例很好理解，期待更多这类文章！', createdAt: '2025-08-11 16:00' },
+    { id: 3, noteId: 1, userId: 1, userName: '管理员', userAvatar: '👑', content: '感谢支持！后续会出更多异步相关的文章。', createdAt: '2025-08-11 17:20' },
+    { id: 4, noteId: 3, userId: 1, userName: '管理员', userAvatar: '👑', content: '看着就很好吃，周末我也要试试！', createdAt: '2025-08-07 09:00' },
+    { id: 5, noteId: 3, userId: 3, userName: '小红', userAvatar: '🌸', content: '烤箱温度有什么需要注意的吗？', createdAt: '2025-08-07 10:30' },
+    { id: 6, noteId: 3, userId: 2, userName: '小明', userAvatar: '😊', content: '每个烤箱脾气不同，建议买个烤箱温度计。', createdAt: '2025-08-07 11:00' },
+    { id: 7, noteId: 4, userId: 2, userName: '小明', userAvatar: '😊', content: '这本书我去年也读了，农业革命那章确实颠覆认知。', createdAt: '2025-08-05 15:00' },
+    { id: 8, noteId: 4, userId: 3, userName: '小红', userAvatar: '🌸', content: '接着看《未来简史》吧，同样精彩！', createdAt: '2025-08-05 16:30' },
+    { id: 9, noteId: 6, userId: 3, userName: '小红', userAvatar: '🌸', content: '太美了！今年秋天一定要去一次。', createdAt: '2025-07-30 20:00' },
+    { id: 10, noteId: 6, userId: 1, userName: '管理员', userAvatar: '👑', content: '岚山的竹林确实值得早起去，体验完全不一样。', createdAt: '2025-07-31 08:00' },
+    { id: 11, noteId: 8, userId: 2, userName: '小明', userAvatar: '😊', content: '总结得很到位，设计心理学确实值得反复读。', createdAt: '2025-07-22 11:00' },
+  ],
+};
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/login.html b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/login.html
new file mode 100644
index 0000000..914aaa5
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/login.html
@@ -0,0 +1,83 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>登录 - 笔记小站</title>
+    <link rel="stylesheet" href="css/style.css">
+</head>
+
+<body>
+
+    <nav class="navbar">
+        <a class="navbar-brand" href="index.html">
+            <span class="logo-icon">📝</span>
+            笔记小站
+        </a>
+        <div class="navbar-actions" id="navbarActions"></div>
+    </nav>
+
+    <div class="modal-overlay"
+        style="position:relative;background:var(--bg);min-height:calc(100vh - 64px);display:flex;align-items:center;justify-content:center;">
+        <div class="login-modal anim-scale-in" style="position:relative;">
+            <h2>🔑 欢迎登录</h2>
+            <p class="subtitle">登录后即可使用完整功能</p>
+            <div class="form-group">
+                <label>用户名</label>
+                <input type="text" id="loginUsername" placeholder="请输入用户名" autofocus>
+            </div>
+            <div class="form-group">
+                <label>密码</label>
+                <input type="password" id="loginPassword" placeholder="请输入密码">
+            </div>
+            <button class="btn btn-primary" onclick="doLogin()">登录</button>
+            <div class="login-hint" style="margin-top:0.5rem;">
+                没有账号？<a href="register.html" style="color:var(--primary);text-decoration:none;font-weight:600;">立即注册</a>
+            </div>
+        </div>
+    </div>
+
+    <div class="toast-container" id="toastContainer"></div>
+
+    <script src="js/common.js"></script>
+    <script>
+        document.addEventListener('DOMContentLoaded', function () { renderNavbar(); });
+
+        window.doLogin = function () {
+            var username = document.getElementById('loginUsername').value.trim();
+            var password = document.getElementById('loginPassword').value.trim();
+            if (!username || !password) {
+                showToast('请填写用户名和密码', 'error'); return;
+            }
+
+            fetch('/function/user.php', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({
+                    action: 'login',
+                    username: username,
+                    password: password
+                })
+            }).then(res => res.json()).then(data => {
+                if (data.code == 0) {
+                    showToast('登录成功', 'success');
+                    setTimeout(() => {
+                        window.location.href = '/';
+                    }, 1000);
+                    return
+                }
+                showToast(data.message, 'error'); return;
+            }).catch(err => {
+                showToast(err.message, 'error');
+            });
+        };
+
+        ['loginUsername', 'loginPassword'].forEach(function (id) {
+            var el = document.getElementById(id);
+            if (el) el.addEventListener('keydown', function (e) { if (e.key === 'Enter') doLogin(); });
+        });
+    </script>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/note.html b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/note.html
new file mode 100644
index 0000000..715da35
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/note.html
@@ -0,0 +1,106 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>笔记详情 - 笔记小站</title>
+<link rel="stylesheet" href="css/style.css">
+</head>
+<body>
+<nav class="navbar">
+  <a class="navbar-brand" href="index.html"><span class="logo-icon">📝</span> 笔记小站</a>
+  <div class="navbar-actions" id="navbarActions"></div>
+</nav>
+
+<div class="container" id="app">
+  <a href="index.html" class="back-link">&larr; 返回笔记列表</a>
+  <div id="noteDetail"></div>
+</div>
+
+<div class="toast-container" id="toastContainer"></div>
+
+<script src="js/data.js"></script>
+<script src="js/common.js"></script>
+<script>
+(function () {
+  var id = parseInt(getUrlParam('id'));
+  var note = null;
+  for (var i = 0; i < DATA.notes.length; i++) {
+    if (DATA.notes[i].id === id) { note = DATA.notes[i]; break; }
+  }
+
+  if (!note) {
+    document.getElementById('noteDetail').innerHTML = emptyState('😕', '笔记未找到');
+    return;
+  }
+
+  document.title = note.title + ' - 笔记小站';
+  var cat = findById(DATA.categories, note.categoryId);
+  var author = findById(DATA.users, note.userId);
+  var comments = DATA.comments.filter(function (c) { return c.noteId === id; });
+
+  var h = '';
+  h += '<div class="note-detail-header">';
+  h += '<h1>' + note.title + '</h1>';
+  h += '<div class="note-detail-meta">';
+  h += categoryBadge(cat);
+  h += '<span>👤 ' + (author ? author.nickname : '未知作者') + '</span>';
+  h += '<span>📅 ' + note.createdAt + '</span>';
+  h += '</div>';
+  h += '</div>';
+  h += '<div class="note-detail-body"><p>' + note.content + '</p></div>';
+
+  h += '<div class="comment-section">';
+  h += '<h3>💬 评论（' + comments.length + '）</h3>';
+  for (var j = 0; j < comments.length; j++) {
+    var c = comments[j];
+    var cu = findById(DATA.users, c.userId);
+    h += '<div class="comment-item">';
+    h += '<div class="comment-avatar">' + (cu ? cu.avatar : '👤') + '</div>';
+    h += '<div class="comment-body">';
+    h += '<div class="comment-meta"><strong>' + (cu ? cu.nickname : c.author || '游客') + '</strong> <span>' + c.createdAt + '</span></div>';
+    h += '<p>' + c.content + '</p>';
+    h += '</div></div>';
+  }
+
+  h += '<div class="comment-form-wrapper">';
+  h += '<h4>📝 发表评论</h4>';
+  h += '<div class="comment-form">';
+  h += '<div class="form-group"><input type="text" id="commentNick" placeholder="你的昵称" maxlength="20"></div>';
+  h += '<div class="form-group"><textarea id="commentContent" placeholder="写下你的想法..." rows="3"></textarea></div>';
+  h += '<button class="btn btn-primary" onclick="submitComment()">发布评论</button>';
+  h += '</div></div>';
+  h += '</div>';
+
+  document.getElementById('noteDetail').innerHTML = h;
+
+  window.submitComment = function () {
+    var nick = document.getElementById('commentNick').value.trim();
+    var content = document.getElementById('commentContent').value.trim();
+    if (!nick) { showToast('请填写昵称', 'error'); return; }
+    if (!content) { showToast('请输入评论内容', 'error'); return; }
+
+    var guestUser = { id: 99, nickname: nick, avatar: '💬', username: 'guest' };
+    DATA.comments.push({
+      id: DATA.comments.length + 1,
+      noteId: note.id,
+      userId: 99,
+      author: nick,
+      content: content,
+      createdAt: new Date().toISOString().slice(0, 16).replace('T', ' ')
+    });
+
+    showToast('评论发表成功', 'success');
+    document.getElementById('commentContent').value = '';
+    document.getElementById('commentNick').value = '';
+    setTimeout(function () { window.location.reload(); }, 600);
+  };
+
+  function findById(arr, id) {
+    for (var i = 0; i < arr.length; i++) { if (arr[i].id === id) return arr[i]; }
+    return null;
+  }
+})();
+</script>
+</body>
+</html>
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/register.html b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/register.html
new file mode 100644
index 0000000..76f010f
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/register.html
@@ -0,0 +1,104 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>注册 - 笔记小站</title>
+<link rel="stylesheet" href="css/style.css">
+</head>
+<body>
+
+<nav class="navbar">
+  <a class="navbar-brand" href="index.html">
+    <span class="logo-icon">📝</span>
+    笔记小站
+  </a>
+  <div class="navbar-actions" id="navbarActions"></div>
+</nav>
+
+<div class="modal-overlay" style="position:relative;background:var(--bg);min-height:calc(100vh - 64px);display:flex;align-items:center;justify-content:center;">
+  <div class="login-modal anim-scale-in" style="position:relative;max-width:440px;">
+    <h2>✍️ 注册账号</h2>
+    <p class="subtitle">创建账号，开始你的笔记之旅</p>
+    <div class="form-group">
+      <label>用户名</label>
+      <input type="text" id="regUsername" placeholder="请输入用户名" autofocus>
+    </div>
+    <div class="form-group">
+      <label>邮箱</label>
+      <input type="email" id="regEmail" placeholder="请输入邮箱地址">
+    </div>
+    <div class="form-group">
+      <label>密码</label>
+      <input type="password" id="regPassword" placeholder="请输入密码（至少6位）">
+    </div>
+    <div class="form-group">
+      <label>确认密码</label>
+      <input type="password" id="regPassword2" placeholder="请再次输入密码">
+    </div>
+    <button class="btn btn-primary" onclick="doRegister()">注册</button>
+    <div class="login-hint">
+      已有账号？<a href="login.html" style="color:var(--primary);text-decoration:none;font-weight:600;">立即登录</a>
+    </div>
+  </div>
+</div>
+
+<div class="toast-container" id="toastContainer"></div>
+
+<script src="js/common.js"></script>
+<script>
+document.addEventListener('DOMContentLoaded', function () { renderNavbar(); });
+
+window.doRegister = function () {
+  var username = document.getElementById('regUsername').value.trim();
+  var email = document.getElementById('regEmail').value.trim();
+  var password = document.getElementById('regPassword').value.trim();
+  var password2 = document.getElementById('regPassword2').value.trim();
+
+  if (!username || !email || !password || !password2) {
+    showToast('请填写所有字段', 'error');
+    return;
+  }
+  if (password.length < 6) {
+    showToast('密码至少需要 6 位', 'error');
+    return;
+  }
+  if (password !== password2) {
+    showToast('两次密码输入不一致', 'error');
+    return;
+  }
+
+  // fetch是一个异步函数，用于发送HTTP请求
+  fetch('/function/user.php', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({
+        'action': 'register',
+        'username': username,
+        'email': email,
+        'password': password
+    })
+  })
+    .then(res => res.json())
+    .then(data => {
+      if (data.code === 0) {
+        showToast('注册成功', 'success');
+        setTimeout(() => {
+          location.href = 'login.html';
+        }, 1000);
+      } else {
+        showToast(data.message, 'error');
+      }
+    })
+    .catch(err => {
+      showToast(err.message, 'error');
+    });
+};
+
+['regUsername','regEmail','regPassword','regPassword2'].forEach(function (id) {
+  var el = document.getElementById(id);
+  if (el) el.addEventListener('keydown', function (e) { if (e.key === 'Enter') doRegister(); });
+});
+</script>
+</body>
+</html>
diff --git a/03.数据库/03.数据库开发项目代码示例/01.笔记网站/spec.md b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/spec.md
new file mode 100644
index 0000000..633b8c9
--- /dev/null
+++ b/03.数据库/03.数据库开发项目代码示例/01.笔记网站/spec.md
@@ -0,0 +1,220 @@
+- 技术栈
+
+  - 原生HTML+CSS+JS
+  - php8.0
+  - Mysql5.7
+- 界面设计
+
+  - 站点主页无需登录，就可以进行内容的浏览
+  - 点击登录，出现登录页面，管理员登录后进入后台管理，普通用户继续浏览主页
+- 用户管理
+
+  - 需要支持用户登录，用户分为管理员和普通用户
+  - 管理员支持对笔记、分类、评论、用户有完整的权限
+  - 普通用户只有查看笔记、分类、评论和发表评论的权限
+- 分类管理
+- 笔记管理
+- 评论管理
+
+---
+
+## 数据库设计
+
+### 数据库信息
+
+- 数据库名: `site03`
+- 字符集: `utf8mb4`
+- 排序规则: `utf8mb4_unicode_ci`
+
+```sql
+CREATE DATABASE IF NOT EXISTS `site03`
+  DEFAULT CHARACTER SET utf8mb4
+  COLLATE utf8mb4_unicode_ci;
+
+USE `site03`;
+```
+
+---
+
+### 表结构
+
+#### 1. users — 用户表
+
+| 字段       | 类型             | 必填 | 说明                              |
+| ---------- | ---------------- | ---- | --------------------------------- |
+| id         | INT UNSIGNED     | 是   | 主键，自增                        |
+| username   | VARCHAR(50)      | 是   | 用户名，唯一                      |
+| password   | VARCHAR(255)     | 是   | 密码哈希（password_hash）         |
+| role       | ENUM('admin','user') | 是 | 角色：管理员 / 普通用户，默认 user |
+| email      | VARCHAR(100)     | 否   | 邮箱                              |
+| avatar     | VARCHAR(255)     | 否   | 头像路径                          |
+| status     | TINYINT(1)       | 是   | 状态：0=禁用, 1=启用，默认 1      |
+| created_at | DATETIME         | 是   | 创建时间                          |
+| updated_at | DATETIME         | 是   | 更新时间                          |
+
+```sql
+CREATE TABLE `users` (
+  `id`         INT UNSIGNED    NOT NULL AUTO_INCREMENT,
+  `username`   VARCHAR(50)     NOT NULL,
+  `password`   VARCHAR(255)    NOT NULL,
+  `role`       ENUM('admin','user') NOT NULL DEFAULT 'user',
+  `email`      VARCHAR(100)    DEFAULT NULL,
+  `avatar`     VARCHAR(255)    DEFAULT NULL,
+  `status`     TINYINT(1)      NOT NULL DEFAULT 1 COMMENT '0=禁用 1=启用',
+  `created_at` DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `uk_username` (`username`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+```
+
+---
+
+#### 2. categories — 分类表
+
+| 字段        | 类型             | 必填 | 说明                         |
+| ----------- | ---------------- | ---- | ---------------------------- |
+| id          | INT UNSIGNED     | 是   | 主键，自增                   |
+| name        | VARCHAR(50)      | 是   | 分类名称，唯一               |
+| slug        | VARCHAR(50)      | 是   | URL 别名，唯一               |
+| description | TEXT             | 否   | 分类描述                     |
+| sort_order  | INT UNSIGNED     | 是   | 排序权重，默认 0             |
+| created_at  | DATETIME         | 是   | 创建时间                     |
+| updated_at  | DATETIME         | 是   | 更新时间                     |
+
+```sql
+CREATE TABLE `categories` (
+  `id`          INT UNSIGNED  NOT NULL AUTO_INCREMENT,
+  `name`        VARCHAR(50)   NOT NULL,
+  `slug`        VARCHAR(50)   NOT NULL,
+  `description` TEXT          DEFAULT NULL,
+  `sort_order`  INT UNSIGNED  NOT NULL DEFAULT 0,
+  `created_at`  DATETIME      NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `updated_at`  DATETIME      NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `uk_name` (`name`),
+  UNIQUE KEY `uk_slug` (`slug`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+```
+
+---
+
+#### 3. notes — 笔记表
+
+| 字段        | 类型                  | 必填 | 说明                                |
+| ----------- | --------------------- | ---- | ----------------------------------- |
+| id          | INT UNSIGNED          | 是   | 主键，自增                          |
+| title       | VARCHAR(255)          | 是   | 笔记标题                            |
+| content     | LONGTEXT              | 是   | 笔记正文                            |
+| summary     | VARCHAR(500)          | 否   | 摘要                                |
+| category_id | INT UNSIGNED          | 是   | 所属分类，外键                      |
+| user_id     | INT UNSIGNED          | 是   | 作者，外键                          |
+| status      | ENUM('draft','published') | 是 | 状态：草稿 / 已发布，默认 draft    |
+| view_count  | INT UNSIGNED          | 是   | 浏览次数，默认 0                    |
+| created_at  | DATETIME              | 是   | 创建时间                            |
+| updated_at  | DATETIME              | 是   | 更新时间                            |
+
+```sql
+CREATE TABLE `notes` (
+  `id`          INT UNSIGNED                NOT NULL AUTO_INCREMENT,
+  `title`       VARCHAR(255)                NOT NULL,
+  `content`     LONGTEXT                    NOT NULL,
+  `summary`     VARCHAR(500)                DEFAULT NULL,
+  `category_id` INT UNSIGNED                NOT NULL,
+  `user_id`     INT UNSIGNED                NOT NULL,
+  `status`      ENUM('draft','published')   NOT NULL DEFAULT 'draft',
+  `view_count`  INT UNSIGNED                NOT NULL DEFAULT 0,
+  `created_at`  DATETIME                    NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `updated_at`  DATETIME                    NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  KEY `idx_category_id` (`category_id`),
+  KEY `idx_user_id`     (`user_id`),
+  KEY `idx_status`      (`status`),
+  CONSTRAINT `fk_notes_category` FOREIGN KEY (`category_id`) REFERENCES `categories`(`id`) ON DELETE RESTRICT,
+  CONSTRAINT `fk_notes_user`     FOREIGN KEY (`user_id`)     REFERENCES `users`(`id`)      ON DELETE RESTRICT
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+```
+
+---
+
+#### 4. comments — 评论表
+
+| 字段       | 类型                                | 必填 | 说明                              |
+| ---------- | ----------------------------------- | ---- | --------------------------------- |
+| id         | INT UNSIGNED                        | 是   | 主键，自增                        |
+| note_id    | INT UNSIGNED                        | 是   | 所属笔记，外键                    |
+| user_id    | INT UNSIGNED                        | 是   | 评论人，外键                      |
+| parent_id  | INT UNSIGNED                        | 否   | 父评论 ID（支持回复），外键       |
+| content    | TEXT                                | 是   | 评论内容                          |
+| status     | ENUM('pending','approved','rejected') | 是 | 审核状态，默认 pending           |
+| created_at | DATETIME                            | 是   | 创建时间                          |
+| updated_at | DATETIME                            | 是   | 更新时间                          |
+
+```sql
+CREATE TABLE `comments` (
+  `id`         INT UNSIGNED                                NOT NULL AUTO_INCREMENT,
+  `note_id`    INT UNSIGNED                                NOT NULL,
+  `user_id`    INT UNSIGNED                                NOT NULL,
+  `parent_id`  INT UNSIGNED                                DEFAULT NULL,
+  `content`    TEXT                                        NOT NULL,
+  `status`     ENUM('pending','approved','rejected')       NOT NULL DEFAULT 'pending',
+  `created_at` DATETIME                                    NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` DATETIME                                    NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  KEY `idx_note_id`   (`note_id`),
+  KEY `idx_user_id`   (`user_id`),
+  KEY `idx_parent_id` (`parent_id`),
+  CONSTRAINT `fk_comments_note`   FOREIGN KEY (`note_id`)   REFERENCES `notes`(`id`) ON DELETE CASCADE,
+  CONSTRAINT `fk_comments_user`   FOREIGN KEY (`user_id`)   REFERENCES `users`(`id`) ON DELETE RESTRICT,
+  CONSTRAINT `fk_comments_parent` FOREIGN KEY (`parent_id`) REFERENCES `comments`(`id`) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+```
+
+---
+
+### 索引说明
+
+| 表         | 索引名              | 字段        | 类型   | 用途                       |
+| ---------- | ------------------- | ----------- | ------ | -------------------------- |
+| users      | PRIMARY             | id          | 主键   | 用户唯一标识               |
+| users      | uk_username         | username    | 唯一   | 用户名唯一约束             |
+| categories | PRIMARY             | id          | 主键   | 分类唯一标识               |
+| categories | uk_name             | name        | 唯一   | 分类名唯一约束             |
+| categories | uk_slug             | slug        | 唯一   | URL 别名唯一约束           |
+| notes      | PRIMARY             | id          | 主键   | 笔记唯一标识               |
+| notes      | idx_category_id     | category_id | 普通   | 按分类查询笔记             |
+| notes      | idx_user_id         | user_id     | 普通   | 按作者查询笔记             |
+| notes      | idx_status          | status      | 普通   | 按发布状态筛选             |
+| comments   | PRIMARY             | id          | 主键   | 评论唯一标识               |
+| comments   | idx_note_id         | note_id     | 普通   | 按笔记查询评论             |
+| comments   | idx_user_id         | user_id     | 普通   | 按用户查询评论             |
+| comments   | idx_parent_id       | parent_id   | 普通   | 查询回复链                 |
+
+---
+
+### 外键约束说明
+
+- `notes.category_id` → `categories.id`: RESTRICT，存在笔记时不可删除分类
+- `notes.user_id` → `users.id`: RESTRICT，存在笔记时不可删除用户
+- `comments.note_id` → `notes.id`: CASCADE，删除笔记时级联删除评论
+- `comments.user_id` → `users.id`: RESTRICT，存在评论时不可删除用户
+- `comments.parent_id` → `comments.id`: CASCADE，删除父评论时级联删除子回复
+
+---
+
+### 种子数据
+
+```sql
+-- 默认管理员: admin / admin123
+INSERT INTO `users` (`username`, `password`, `role`) VALUES
+('admin', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'admin');
+
+-- 示例分类
+INSERT INTO `categories` (`name`, `slug`, `description`, `sort_order`) VALUES
+('技术笔记', 'tech',     '编程与技术相关笔记',   1),
+('生活随笔', 'life',     '日常生活与感悟',       2),
+('读书笔记', 'reading',  '书籍阅读与书评',       3);
+```
+
+> 密码 `admin123` 使用 PHP `password_hash('admin123', PASSWORD_DEFAULT)` 生成，实际部署时请更换。
+> 详细搭建说明参见 [spec.md](#) 附录。
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