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+<!DOCTYPE html>
+<html lang="zh-CN">
+
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <title>4-4 购物车 · 添加图书</title>
+  <script src="https://unpkg.com/vue@3.3.4/dist/vue.global.js"></script>
+  <style>
+    :root {
+      --bg: #f6f8fa;
+      --card: #ffffff;
+      --muted: #6b7280;
+      --text: #111827;
+      --primary: #2563eb;
+      --primary-600: #1e40af;
+      --border: #e5e7eb;
+      --chip: #eef2ff;
+      --chip-text: #3730a3;
+      --danger: #dc2626;
+      --success: #059669;
+      --shadow: 0 10px 24px rgba(0, 0, 0, .06);
+      --radius: 14px;
+    }
+
+    * {
+      box-sizing: border-box;
+    }
+
+    html,
+    body {
+      height: 100%;
+    }
+
+    body {
+      margin: 0;
+      font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB";
+      color: var(--text);
+      background: radial-gradient(1200px 600px at 10% -10%, #eff6ff 0%, transparent 60%),
+        radial-gradient(1000px 500px at 110% 10%, #fef3c7 0%, transparent 60%),
+        var(--bg);
+    }
+
+    .container {
+      max-width: 1100px;
+      margin: 32px auto 48px;
+      padding: 0 16px;
+    }
+
+    .titlebar {
+      display: flex;
+      align-items: center;
+      justify-content: space-between;
+      gap: 16px;
+      margin-bottom: 18px;
+    }
+
+    h1 {
+      margin: 0;
+      font-size: 28px;
+      letter-spacing: .4px;
+      display: flex;
+      align-items: center;
+      gap: 10px;
+    }
+
+    .badge {
+      font-size: 12px;
+      color: #fff;
+      background: var(--primary);
+      padding: 2px 8px;
+      border-radius: 999px;
+      box-shadow: var(--shadow);
+    }
+
+    /* One-column vertical stack */
+    .stack {
+      display: flex;
+      flex-direction: column;
+      gap: 16px;
+    }
+
+    .card {
+      background: var(--card);
+      border: 1px solid var(--border);
+      border-radius: var(--radius);
+      box-shadow: var(--shadow);
+    }
+
+    .card h3 {
+      margin: 0 0 12px;
+      font-size: 18px;
+      letter-spacing: .3px;
+    }
+
+    .card-body {
+      padding: 18px;
+    }
+
+    .subtle {
+      font-size: 12px;
+      color: #4b5563;
+      margin-top: -4px;
+    }
+
+    /* Form */
+    .form-grid {
+      display: grid;
+      gap: 12px;
+      grid-template-columns: 120px 1fr;
+      align-items: center;
+    }
+
+    @media (max-width: 560px) {
+      .form-grid {
+        grid-template-columns: 1fr;
+      }
+
+      .form-grid label {
+        font-size: 13px;
+      }
+    }
+
+    .form-grid label {
+      color: #374151;
+    }
+
+    .form-grid input[type="text"],
+    .form-grid input[type="number"],
+    .form-grid input[type="month"],
+    .form-grid select {
+      width: 100%;
+      appearance: none;
+      border: 1px solid var(--border);
+      padding: 10px 12px;
+      border-radius: 10px;
+      outline: none;
+      background: #fff;
+      transition: box-shadow .2s, border-color .2s;
+    }
+
+    .form-grid input:focus,
+    .form-grid select:focus {
+      border-color: var(--primary);
+      box-shadow: 0 0 0 4px rgba(37, 99, 235, .12);
+    }
+
+    .inline {
+      display: flex;
+      gap: 12px;
+      flex-wrap: wrap;
+    }
+
+    .radio,
+    .checkbox {
+      display: inline-flex;
+      align-items: center;
+      gap: 6px;
+    }
+
+    .actions {
+      display: flex;
+      align-items: center;
+      gap: 10px;
+      margin-top: 10px;
+      flex-wrap: wrap;
+    }
+
+    .btn {
+      appearance: none;
+      border: 1px solid transparent;
+      cursor: pointer;
+      padding: 10px 14px;
+      border-radius: 10px;
+      font-weight: 600;
+      transition: transform .06s ease, box-shadow .2s ease, background .2s ease;
+    }
+
+    .btn:active {
+      transform: translateY(1px);
+    }
+
+    .btn-primary {
+      background: var(--primary);
+      color: #fff;
+      box-shadow: 0 6px 18px rgba(37, 99, 235, .25);
+    }
+
+    .btn-primary:hover {
+      background: var(--primary-600);
+    }
+
+    .btn-ghost {
+      background: #fff;
+      border-color: var(--border);
+    }
+
+    .error {
+      color: var(--danger);
+      font-size: 13px;
+    }
+
+    /* List (vertical cards) */
+    .list {
+      display: flex;
+      flex-direction: column;
+      gap: 12px;
+    }
+
+    .row {
+      display: grid;
+      grid-template-columns: 1fr auto;
+      gap: 12px;
+      align-items: center;
+      border: 1px solid var(--border);
+      border-radius: 12px;
+      background: #fff;
+      padding: 14px;
+      box-shadow: var(--shadow);
+    }
+
+    .row:hover {
+      border-color: var(--primary);
+      box-shadow: 0 0 0 3px rgba(37, 99, 235, .10), var(--shadow);
+    }
+
+    .meta {
+      display: grid;
+      gap: 6px;
+    }
+
+    .title {
+      font-weight: 800;
+      line-height: 1.3;
+    }
+
+    .muted {
+      color: var(--muted);
+      font-size: 13px;
+    }
+
+    .chips {
+      display: flex;
+      gap: 6px;
+      flex-wrap: wrap;
+    }
+
+    .chip {
+      background: var(--chip);
+      color: var(--chip-text);
+      border: 1px solid #e0e7ff;
+      padding: 2px 8px;
+      border-radius: 999px;
+      font-size: 12px;
+    }
+
+    .right {
+      display: flex;
+      align-items: center;
+      gap: 12px;
+    }
+
+    .qty {
+      display: flex;
+      align-items: center;
+      gap: 8px;
+    }
+
+    .iconbtn {
+      width: 28px;
+      height: 28px;
+      border-radius: 8px;
+      line-height: 26px;
+      text-align: center;
+      border: 1px solid var(--border);
+      background: #fff;
+      cursor: pointer;
+    }
+
+    .iconbtn:hover {
+      border-color: var(--primary);
+      box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
+    }
+
+    .price {
+      font-weight: 800;
+    }
+
+    .tag-on {
+      color: var(--success);
+      font-weight: 700;
+    }
+
+    .danger {
+      color: #fff;
+      background: var(--danger);
+      border-color: transparent;
+    }
+
+    .danger:hover {
+      filter: brightness(.95);
+    }
+
+    .footer {
+      display: flex;
+      justify-content: space-between;
+      align-items: center;
+      gap: 12px;
+      margin-top: 14px;
+      padding: 12px 16px;
+      background: #fff;
+      border: 1px solid var(--border);
+      border-radius: var(--radius);
+      box-shadow: var(--shadow);
+    }
+
+    .total {
+      font-size: 18px;
+      font-weight: 800;
+    }
+
+    .empty {
+      text-align: center;
+      color: var(--muted);
+      padding: 48px 16px;
+    }
+  </style>
+</head>
+
+<body>
+  <div id="app" class="container">
+    <div class="titlebar">
+      <h1>图书购物车 </h1>
+    </div>
+    <div class="stack">
+      <!-- 顶部：添加图书 -->
+      <div class="card">
+        <div class="card-body">
+          <h3>添加图书</h3>
+          <div class="form-grid" style="margin-top:12px;">
+            <label for="name">书名*</label>
+            <input id="name" v-model="form.name" placeholder="例如：《现代操作系统》" type="text" />
+
+            <label for="author">作者*</label>
+            <input id="author" v-model="form.author" placeholder="例如：Andrew S. Tanenbaum" type="text" />
+
+            <label for="date">出版日期*</label>
+            <input id="date" v-model="form.date" type="month" />
+
+            <label for="price">价格*</label>
+            <input id="price" v-model.number="form.price" type="number" step="0.01" min="0" placeholder="例如：88.00" />
+
+            <label for="num">数量*</label>
+            <input id="num" v-model.number="form.num" type="number" min="1" />
+
+            <label for="category">类别*</label>
+            <select id="category" v-model="form.category">
+              <option value="">请选择</option>
+              <option value="计算机基础">计算机基础</option>
+              <option value="编程语言">编程语言</option>
+              <option value="数据库">数据库</option>
+              <option value="计算机网络">计算机网络</option>
+              <option value="操作系统">操作系统</option>
+              <option value="软件工程">软件工程</option>
+            </select>
+
+            <label>格式*</label>
+            <div class="inline">
+              <label class="radio"><input type="radio" name="format" v-model="form.format" value="纸质书" /> 纸质书</label>
+              <label class="radio"><input type="radio" name="format" v-model="form.format" value="电子书" /> 电子书</label>
+              <label class="radio"><input type="radio" name="format" v-model="form.format" value="套装" /> 套装</label>
+            </div>
+
+            <label>标签</label>
+            <div class="inline">
+              <label class="checkbox"><input type="checkbox" v-model="form.tags" value="教材" /> 教材</label>
+              <label class="checkbox"><input type="checkbox" v-model="form.tags" value="经典" /> 经典</label>
+              <label class="checkbox"><input type="checkbox" v-model="form.tags" value="实例丰富" /> 实例丰富</label>
+              <label class="checkbox"><input type="checkbox" v-model="form.tags" value="考试推荐" /> 考试推荐</label>
+            </div>
+
+            <label>是否现货</label>
+            <div class="inline">
+              <label class="checkbox">
+                <input type="checkbox" v-model="form.inStock" :true-value="true" :false-value="false" />
+                有现货
+              </label>
+            </div>
+
+            <label for="language">语言</label>
+            <select id="language" v-model="form.language">
+              <option value="中文">中文</option>
+              <option value="英文">英文</option>
+              <option value="其他">其他</option>
+            </select>
+
+            <label for="isbn">ISBN</label>
+            <input id="isbn" v-model="form.isbn" placeholder="例如：978-7-xxxx-xxxxx-x" type="text" />
+          </div>
+
+          <div class="actions">
+            <button class="btn btn-primary" @click="addBook">添加到列表</button>
+            <button class="btn btn-ghost" @click="resetForm">重置</button>
+            <span class="error" v-if="errorMsg">{{ errorMsg }}</span>
+          </div>
+        </div>
+      </div>
+
+      <!-- 底部：垂直卡片列表 -->
+      <div class="card" v-if="books.length">
+        <div class="card-body">
+          <h3>图书列表</h3>
+          <div class="list" style="margin-top:10px;">
+            <div class="row" v-for="item in books" :key="item.id">
+              <div class="meta">
+                <div class="title">{{ item.name }}</div>
+                <div class="muted">作者：{{ item.author }}　|　类别：{{ item.category }}　|　格式：{{ item.format }}</div>
+                <div class="muted">出版：{{ item.date }}　|　ISBN：{{ item.isbn }}　|　价格：￥{{ item.price.toFixed(2)
+                  }}　|　现货：<span :class="{'tag-on': item.inStock}">{{ item.inStock ? '是' : '否' }}</span></div>
+                <div class="chips">
+                  <span class="chip" v-for="t in item.tags" :key="t">{{ t }}</span>
+                </div>
+              </div>
+              <div class="right">
+                <div class="qty">
+                  <button class="iconbtn" title="增加" @click="inc(item)">+</button>
+                  <strong>{{ item.num }}</strong>
+                  <button class="iconbtn" title="减少" @click="dec(item)">-</button>
+                </div>
+                <button class="btn danger" @click="remove(item.id)">移除</button>
+              </div>
+            </div>
+          </div>
+          <div class="footer">
+            <div class="muted">共 {{ books.length }} 本书</div>
+            <div class="total">总价格：￥{{ sum.toFixed(2) }}</div>
+          </div>
+        </div>
+      </div>
+
+      <div class="empty card" v-else>
+        <div class="card-body">
+          <h3 style="margin:0 0 4px;">列表为空</h3>
+          <div class="muted">请先在上方表单添加图书</div>
+        </div>
+      </div>
+    </div>
+  </div>
+
+  <script>
+    const { createApp } = Vue;
+
+    createApp({
+      data() {
+        return {
+          books: [
+            { id: 1, name: "《JavaScript程序设计》", author: "张三", category: "编程语言", format: "纸质书", tags: ["教材", "经典"], inStock: true, language: "中文", isbn: "978-7-00000-000-1", date: "2022-09", price: 85.00, num: 1 },
+            { id: 2, name: "《C语言基础》", author: "李四", category: "编程语言", format: "纸质书", tags: ["教材"], inStock: true, language: "中文", isbn: "978-7-00000-000-2", date: "2021-02", price: 59.00, num: 1 },
+            { id: 3, name: "《Java高级语言编程》", author: "王五", category: "编程语言", format: "电子书", tags: ["经典", "实例丰富"], inStock: true, language: "中文", isbn: "978-7-00000-000-3", date: "2022-10", price: 39.00, num: 1 },
+            { id: 4, name: "《数据库原理》", author: "赵六", category: "数据库", format: "纸质书", tags: ["教材", "考试推荐"], inStock: false, language: "中文", isbn: "978-7-00000-000-4", date: "2023-03", price: 128.00, num: 1 },
+            { id: 5, name: "《计算机网络》", author: "周七", category: "计算机网络", format: "纸质书", tags: ["经典"], inStock: true, language: "中文", isbn: "978-7-00000-000-5", date: "2022-08", price: 88.00, num: 1 },
+          ],
+          form: {
+            name: "",
+            author: "",
+            date: "",
+            price: null,
+            num: 1,
+            category: "",
+            format: "",
+            tags: [],
+            inStock: false,
+            language: "中文",
+            isbn: ""
+          },
+          errorMsg: ""
+        };
+      },
+      computed: {
+        // 计算总价
+        sum() {
+          return this.books.reduce((total, book) => {
+            return total + book.price * book.num;
+          }, 0);
+        },
+      },
+      methods: {
+        inc(item) {
+          item.num++;
+        },
+        dec(item) {
+          if (item.num > 1)
+            item.num--;
+        },
+        remove(id) {
+          this.books = this.books.filter(b => b.id !== id);
+        },
+
+        // 表单验证
+        validateForm() {
+          if (!this.form.name.trim()) {
+            this.errorMsg = "书名不能为空";
+            return false;
+          }
+          if (!this.form.author.trim()) {
+            this.errorMsg = "作者不能为空";
+            return false;
+          }
+          if (!this.form.date) {
+            this.errorMsg = "出版日期不能为空";
+            return false;
+          }
+          if (!this.form.price || this.form.price <= 0) {
+            this.errorMsg = "价格必须大于0";
+            return false;
+          }
+          if (!this.form.num || this.form.num < 1) {
+            this.errorMsg = "数量必须至少为1";
+            return false;
+          }
+          if (!this.form.category) {
+            this.errorMsg = "请选择类别";
+            return false;
+          }
+          if (!this.form.format) {
+            this.errorMsg = "请选择格式";
+            return false;
+          }
+          this.errorMsg = "";
+          return true;
+        },
+
+        // 获取下一个ID
+        nextId() {
+          if (this.books.length === 0) return 1;
+          return Math.max(...this.books.map(b => b.id)) + 1;
+        },
+
+        // 添加图书到列表
+        addBook() {
+          if (!this.validateForm()) {
+            return;
+          }
+
+          const newBook = {
+            id: this.nextId(),
+            name: this.form.name,
+            author: this.form.author,
+            date: this.form.date,
+            price: this.form.price,
+            num: this.form.num,
+            category: this.form.category,
+            format: this.form.format,
+            tags: [...this.form.tags],
+            inStock: this.form.inStock,
+            language: this.form.language,
+            isbn: this.form.isbn
+          };
+
+          this.books.push(newBook);
+          this.resetForm();
+        },
+
+        // 重置表单
+        resetForm() {
+          this.form = {
+            name: "",
+            author: "",
+            date: "",
+            price: null,
+            num: 1,
+            category: "",
+            format: "",
+            tags: [],
+            inStock: false,
+            language: "中文",
+            isbn: ""
+          };
+          this.errorMsg = "";
+        }
+      }
+    }).mount("#app");
+  </script>
+</body>
+
+</html>
\ No newline at end of file
