```html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>HTML基础教程 - 第二部分：文本、链接与列表</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
body {
background: linear-gradient(135deg, #f5f7fa 0%, #e4ecfb 100%);
color: #2c3e50;
line-height: 1.7;
padding: 20px;
min-height: 100vh;
}
.container {
max-width: 1200px;
margin: 0 auto;
padding: 20px;
}
header {
text-align: center;
padding: 50px 20px;
margin-bottom: 40px;
background: linear-gradient(to right, #4a69dd, #6a5af9);
color: white;
border-radius: 15px;
box-shadow: 0 10px 30px rgba(106, 90, 249, 0.3);
position: relative;
overflow: hidden;
}
header::before {
content: "";
position: absolute;
top: -50%;
left: -50%;
width: 200%;
height: 200%;
background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
transform: rotate(30deg);
}
h1 {
font-size: 3.5rem;
margin-bottom: 15px;
letter-spacing: -1px;
position: relative;
z-index: 2;
text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}
.subtitle {
font-size: 1.6rem;
max-width: 800px;
margin: 0 auto;
opacity: 0.9;
font-weight: 300;
position: relative;
z-index: 2;
}
.progress-bar {
height: 5px;
background: rgba(255,255,255,0.3);
border-radius: 10px;
margin: 20px auto 0;
max-width: 500px;
position: relative;
overflow: hidden;
}
.progress {
height: 100%;
width: 65%;
background: white;
border-radius: 10px;
box-shadow: 0 0 10px rgba(255,255,255,0.5);
}
.content-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
gap: 30px;
margin-bottom: 50px;
}
.card {
background: white;
border-radius: 15px;
padding: 30px;
box-shadow: 0 10px 20px rgba(0,0,0,0.05);
transition: all 0.3s ease;
position: relative;
overflow: hidden;
}
.card:hover {
transform: translateY(-10px);
box-shadow: 0 15px 30px rgba(106, 90, 249, 0.2);
}
.card::before {
content: "";
position: absolute;
top: 0;
left: 0;
width: 5px;
height: 100%;
background: linear-gradient(to bottom, #4a69dd, #6a5af9);
}
h2 {
color: #4a69dd;
margin-bottom: 25px;
padding-bottom: 15px;
border-bottom: 2px solid #f0f4ff;
font-size: 2.2rem;
}
h3 {
color: #6a5af9;
margin: 20px 0 15px;
font-size: 1.5rem;
}
p {
margin-bottom: 15px;
color: #555;
}
.code-block {
background: #2d3a5c;
color: #e2e8ff;
padding: 20px;
border-radius: 10px;
margin: 20px 0;
font-family: 'Courier New', monospace;
line-height: 1.6;
overflow-x: auto;
box-shadow: inset 0 0 10px rgba(0,0,0,0.3);
}
.tag {
color: #ff9999;
}
.attr {
color: #66b3ff;
}
.value {
color: #ffcc66;
}
.example-container {
background: #f8f9ff;
padding: 25px;
border-radius: 12px;
margin: 20px 0;
border-left: 4px solid #6a5af9;
transition: all 0.3s ease;
}
.example-container:hover {
transform: scale(1.01);
box-shadow: 0 5px 15px rgba(106, 90, 249, 0.1);
}
.image-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
gap: 20px;
margin: 30px 0;
}
.image-card {
background: white;
border-radius: 12px;
overflow: hidden;
box-shadow: 0 5px 15px rgba(0,0,0,0.1);
transition: all 0.3s ease;
}
.image-card:hover {
transform: translateY(-5px);
box-shadow: 0 15px 30px rgba(106, 90, 249, 0.2);
}
.image-card img {
width: 100%;
height: 200px;
object-fit: cover;
display: block;
}
.image-card .caption {
padding: 15px;
font-size: 0.95rem;
color: #666;
text-align: center;
background: #f9faff;
}
.btn {
display: inline-block;
background: linear-gradient(to right, #4a69dd, #6a5af9);
color: white;
padding: 12px 28px;
border-radius: 30px;
text-decoration: none;
font-weight: 600;
margin: 10px 5px;
box-shadow: 0 5px 15px rgba(106, 90, 249, 0.4);
transition: all 0.3s ease;
}
.btn:hover {
transform: translateY(-3px);
box-shadow: 0 8px 20px rgba(106, 90, 249, 0.6);
}
.footer {
text-align: center;
padding: 40px;
margin-top: 50px;
background: white;
border-radius: 15px;
box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}
@media (max-width: 768px) {
h1 {
font-size: 2.5rem;
}
.subtitle {
font-size: 1.2rem;
}
.content-grid {
grid-template-columns: 1fr;
}
}
</style>
</head>
<body>
<div class="container">
<header>
<h1>HTML基础教程：第二部分</h1>
<p class="subtitle">深入文本格式化、超链接与列表的强大功能</p>
<div class="progress-bar">
<div class="progress"></div>
</div>
</header>
<div class="content-grid">
<div class="card">
<h2>文本格式化</h2>
<h3>基础文本标签</h3>
<p>HTML提供了多种标签来格式化文本内容：</p>
<div class="code-block">
<span class="tag"><p></span>这是一个段落<span class="tag"></p></span><br>
<span class="tag"><b></span>粗体文本<span class="tag"></b></span><br>
<span class="tag"><i></span>斜体文本<span class="tag"></i></span><br>
<span class="tag"><strong></span>重要文本（语义更强）<span class="tag"></strong></span><br>
<span class="tag"><em></span>强调文本（语义更强）<span class="tag"></em></span><br>
<span class="tag"><small></span>小号文本<span class="tag"></small></span><br>
<span class="tag"><mark></span>突出显示文本<span class="tag"></mark></span><br>
<span class="tag"><sub></span>下标文本<span class="tag"></sub></span> | <span class="tag"><sup></span>上标文本<span class="tag"></sup></span>
</div>
<div class="example-container">
<h3>实际效果：</h3>
<p>这是一个<strong>非常重要的</strong>HTML示例！它展示了文本<mark>标记与格式化</mark>。</p>
<p><b>粗体文本</b>和<i>斜体文本</i>是基础样式，而<em>强调文本</em>有语义含义。</p>
<p>化学式：H<sub>2</sub>O | 数学公式：x<sup>2</sup> + y<sup>2</sup> = z<sup>2</sup></p>
</div>
</div>
<div class="card">
<h2>超链接（Anchor）</h2>
<h3>基础链接语法</h3>
<p>超链接是互联网的核心，使用 <code><a></code> 标签创建：</p>
<div class="code-block">
<span class="tag"><a</span> <span class="attr">href=</span><span class="value">"https://www.example.com"</span><span class="tag">></span>访问示例网站<span class="tag"></a></span><br><br>
<span class="comment"><!-- 邮件链接 --></span><br>
<span class="tag"><a</span> <span class="attr">href=</span><span class="value">"mailto:contact@example.com"</span><span class="tag">></span>发送邮件<span class="tag"></a></span><br><br>
<span class="comment"><!-- 电话链接 --></span><br>
<span class="tag"><a</span> <span class="attr">href=</span><span class="value">"tel:+1234567890"</span><span class="tag">></span>打电话给我们<span class="tag"></a></span>
</div>
<h3>链接属性</h3>
<ul class="example-container">
<li><strong>target</strong>：指定打开方式（如 _blank 新标签页）</li>
<li><strong>title</strong>：鼠标悬停时显示的提示文本</li>
<li><strong>download</strong>：提示下载链接资源</li>
</ul>
<div class="example-container">
<a href="#" class="btn">访问示例网站</a>
<a href="#" class="btn">发送邮件</a>
<a href="#" class="btn">打电话给我们</a>
</div>
</div>
</div>
<div class="card">
<h2>列表结构</h2>
<div class="content-grid">
<div>
<h3>无序列表（ul）</h3>
<div class="code-block">
<span class="tag"><ul></span><br>
<span class="tag"><li></span>列表项 1<span class="tag"></li></span><br>
<span class="tag"><li></span>列表项 2<span class="tag"></li></span><br>
<span class="tag"><li></span>列表项 3<span class="tag"></li></span><br>
<span class="tag"></ul></span>
</div>
<div class="example-container">
<h4>浏览器效果：</h4>
<ul>
<li>HTML基础元素</li>
<li>CSS样式应用</li>
<li>JavaScript交互</li>
</ul>
</div>
</div>
<div>
<h3>有序列表（ol）</h3>
<div class="code-block">
<span class="tag"><ol></span><br>
<span class="tag"><li></span>第一步<span class="tag"></li></span><br>
<span class="tag"><li></span>第二步<span class="tag"></li></span><br>
<span class="tag"><li></span>第三步<span class="tag"></li></span><br>
<span class="tag"></ol></span>
</div>
<div class="example-container">
<h4>浏览器效果：</h4>
<ol>
<li>准备HTML结构</li>
<li>添加CSS样式</li>
<li>实现交互功能</li>
</ol>
</div>
</div>
</div>
<h3>列表嵌套示例</h3>
<div class="image-grid">
<div class="image-card">
<div style="height:200px;background:linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);display:flex;align-items:center;justify-content:center;">
<div>
<ul>
<li>前端开发
<ul>
<li>HTML</li>
<li>CSS</li>
<li>JavaScript</li>
</ul>
</li>
</ul>
</div>
</div>
<div class="caption">无序列表嵌套</div>
</div>
<div class="image-card">
<div style="height:200px;background:linear-gradient(135deg, #d4fc79 0%, #96e6a1 100%);display:flex;align-items:center;justify-content:center;">
<div>
<ol>
<li>项目准备
<ol>
<li>需求分析</li>
<li>原型设计</li>
</ol>
</li>
</ol>
</div>
</div>
<div class="caption">有序列表嵌套</div>
</div>
</div>
</div>
<div class="card">
<h2>语义化结构</h2>
<p>HTML5引入新的语义元素，让页面结构更清晰：</p>
<div class="code-block">
<span class="tag"><header></span>页眉内容<span class="tag"></header></span><br>
<span class="tag"><nav></span>导航链接<span class="tag"></nav></span><br>
<span class="tag"><main></span>主内容区域<span class="tag"></main></span><br>
<span class="tag"><section></span>独立内容区块<span class="tag"></section></span><br>
<span class="tag"><article></span>独立文章内容<span class="tag"></article></span><br>
<span class="tag"><aside></span>侧边栏内容<span class="tag"></aside></span><br>
<span class="tag"><footer></span>页脚内容<span class="tag"></footer></span>
</div>
<div class="image-grid">
<div class="image-card">
<img src="https://images.unsplash.com/photo-1551650975-87deedd944c3?crop=entropy&cs=tinysrgb&fit=crop&fm=jpg&w=600&h=400" alt="HTML语义结构" style="object-fit: cover;">
<div class="caption">HTML5语义元素布局示例</div>
</div>
<div class="image-card">
<img src="https://images.unsplash.com/photo-1547658719-da2b51169166?crop=entropy&cs=tinysrgb&fit=crop&fm=jpg&w=600&h=400" alt="网页代码">
<div class="caption">使用语义标签的HTML代码</div>
</div>
</div>
</div>
<div class="footer">
<h3>继续你的HTML学习之旅！</h3>
<p>在下一篇教程中，我们将深入探讨表单、表格和多媒体元素。</p>
<div style="margin-top: 30px;">
<a href="#" class="btn">上一篇教程</a>
<a href="#" class="btn">下一篇教程</a>
</div>
</div>
</div>
<script>
// 为链接添加简单交互效果
document.querySelectorAll('.btn').forEach(btn => {
btn.addEventListener('click', function(e) {
e.preventDefault();
alert('导航功能将在实际网站中实现！');
});
});
</script>
</body>
</html>
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