/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* 容器样式 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background-color: #2e7d32;
    color: #fff;
    padding: 20px 0;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 导航栏样式 */
nav {
    background-color: #388e3c;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

nav ul li {
    margin: 0;
}

nav ul li a {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: #fff;
    text-decoration: none;
    transition: background-color 0.3s ease;
    border-radius: 4px;
}

.nav-icon {
    margin-right: 6px;
    display: inline-block;
    vertical-align: middle;
}

nav ul li a:hover {
    background-color: #2e7d32;
}

nav ul li a:active {
    background-color: #1b5e20;
}

/* 主内容区域样式 */
main {
    padding: 30px 0;
}

section {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

section h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: #2e7d32;
    border-bottom: 2px solid #388e3c;
    padding-bottom: 10px;
}

section h3 {
    font-size: 1.5rem;
    margin: 20px 0 15px;
    color: #388e3c;
}

section p {
    margin-bottom: 15px;
    text-align: justify;
}

section ul {
    margin-bottom: 15px;
    padding-left: 20px;
}

section ul li {
    margin-bottom: 8px;
}

section ol {
    margin-bottom: 15px;
    padding-left: 20px;
}

section ol li {
    margin-bottom: 8px;
}

/* 代码示例样式 */
.code-example {
    background-color: #f8f8f8;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 15px;
    margin: 15px 0;
    overflow-x: auto;
    position: relative;
}

.code-example pre {
    margin: 0;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.4;
}

.code-example code {
    color: #333;
}

/* 代码语法高亮 */
.code-highlight .tag {
    color: #0000ff;
}

.code-highlight .attribute {
    color: #800080;
}

.code-highlight .value {
    color: #008000;
}

.code-highlight .comment {
    color: #808080;
    font-style: italic;
}

.code-highlight .doctype {
    color: #808080;
}

.code-highlight .entity {
    color: #ff0000;
}

/* 复制按钮样式 */
.copy-button {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 5px 10px;
    font-size: 0.8rem;
    background-color: #388e3c;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    z-index: 10;
    transition: background-color 0.3s ease;
}

.copy-button:hover {
    background-color: #2e7d32;
}

.copy-button.copied {
    background-color: #4CAF50;
}

/* 表格样式 */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
    font-size: 0.9rem;
}

table th, table td {
    padding: 10px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

table th {
    background-color: #f2f2f2;
    font-weight: bold;
}

table tr:hover {
    background-color: #f5f5f5;
}

/* 代码标签样式 */
code {
    background-color: #f2f2f2;
    padding: 2px 4px;
    border-radius: 3px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
}

/* 页脚样式 */
footer {
    background-color: #2e7d32;
    color: #fff;
    padding: 20px 0;
    text-align: center;
    margin-top: 40px;
}

footer p {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.9;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    header h1 {
        font-size: 2.2rem;
    }
    
    header p {
        font-size: 1.1rem;
    }
    
    nav ul {
        gap: 8px;
    }
    
    nav ul li a {
        padding: 10px 14px;
        font-size: 0.9rem;
    }
    
    section {
        padding: 25px;
    }
    
    section h2 {
        font-size: 1.9rem;
    }
    
    section h3 {
        font-size: 1.4rem;
    }
    
    .container {
        padding: 0 18px;
    }
    
    .path-cards {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: 15px;
    }
    
    .tools-container {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 15px;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    section {
        padding: 20px;
    }
    
    section h2 {
        font-size: 1.8rem;
    }
    
    section h3 {
        font-size: 1.3rem;
    }
    
    .container {
        padding: 0 15px;
    }
    
    table {
        font-size: 0.8rem;
    }
    
    table th, table td {
        padding: 8px;
    }
    
    .tool-card {
        padding: 15px;
    }
    
    .path-cards {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .tools-container {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .flex-container {
        flex-direction: column;
    }
    
    .grid-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .code-example {
        padding: 12px;
    }
    
    .code-example pre {
        font-size: 0.85rem;
    }
    
    .encouragement,
    .learning-tip,
    .progress-check {
        padding: 15px;
    }
    
    .encouragement h3 {
        font-size: 1.3rem;
    }
    
    .learning-tip h4,
    .progress-check h4 {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    header p {
        font-size: 0.9rem;
    }
    
    section {
        padding: 15px;
    }
    
    section h2 {
        font-size: 1.5rem;
    }
    
    section h3 {
        font-size: 1.2rem;
    }
    
    .code-example {
        padding: 10px;
    }
    
    .code-example pre {
        font-size: 0.8rem;
    }
    
    .container {
        padding: 0 10px;
    }
    
    nav ul li a {
        padding: 8px 10px;
        font-size: 0.9rem;
    }
    
    table {
        font-size: 0.7rem;
    }
    
    table th, table td {
        padding: 6px;
    }
    
    .tool-card {
        padding: 12px;
    }
    
    .tool-card h3 {
        font-size: 1.2rem;
    }
    
    .code-input {
        font-size: 0.8rem;
        padding: 8px;
    }
    
    .btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
    
    .encouragement,
    .learning-tip,
    .progress-check {
        padding: 12px;
    }
    
    .encouragement h3 {
        font-size: 1.2rem;
    }
    
    .learning-tip h4,
    .progress-check h4 {
        font-size: 1rem;
    }
    
    .grid-container {
        grid-template-columns: 1fr;
    }
    
    .color-palette {
        justify-content: center;
    }
    
    .color-swatch {
        width: 80px;
        height: 80px;
        font-size: 0.8rem;
    }
    
    .chapter-nav {
        flex-direction: column;
        align-items: stretch;
    }
    
    .chapter-nav a {
        justify-content: center;
    }
}

@media (max-width: 360px) {
    header h1 {
        font-size: 1.6rem;
    }
    
    header p {
        font-size: 0.85rem;
    }
    
    section {
        padding: 12px;
    }
    
    section h2 {
        font-size: 1.3rem;
    }
    
    section h3 {
        font-size: 1.1rem;
    }
    
    .container {
        padding: 0 8px;
    }
    
    nav ul li a {
        padding: 6px 8px;
        font-size: 0.85rem;
    }
    
    .nav-icon {
        width: 16px;
        height: 16px;
        margin-right: 4px;
    }
    
    table {
        font-size: 0.65rem;
    }
    
    table th, table td {
        padding: 4px;
    }
    
    .code-example pre {
        font-size: 0.75rem;
    }
    
    .btn {
        padding: 5px 10px;
        font-size: 0.75rem;
    }
    
    footer p {
        font-size: 0.8rem;
    }
}

/* 鼓励性内容和学习提示样式 */
.encouragement {
    background-color: #e8f5e8;
    border-left: 4px solid #4caf50;
    padding: 20px;
    margin: 20px 0;
    border-radius: 0 8px 8px 0;
}

.encouragement h3 {
    color: #2e7d32;
    margin-top: 0;
}

/* 学习路径样式 */
.learning-paths {
    margin: 30px 0;
}

.path-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.path-card {
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.path-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.path-card h4 {
    color: #333;
    margin-top: 0;
    font-size: 1.2rem;
}

.path-card p {
    color: #666;
    margin-bottom: 15px;
}

.path-card .btn {
    display: inline-block;
    padding: 8px 16px;
    background-color: #388e3c;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.path-card .btn:hover {
    background-color: #2e7d32;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 8px 16px;
    background-color: #388e3c;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #2e7d32;
}

.learning-tip {
    background-color: #e3f2fd;
    border-left: 4px solid #2196f3;
    padding: 15px;
    margin: 15px 0;
    border-radius: 0 6px 6px 0;
}

.learning-tip h4 {
    color: #1565c0;
    margin-top: 0;
    font-size: 1.1rem;
}

.learning-tip p {
    margin-bottom: 0;
}

.progress-check {
    background-color: #fff8e1;
    border-left: 4px solid #ff9800;
    padding: 15px;
    margin: 15px 0;
    border-radius: 0 6px 6px 0;
}

.progress-check h4 {
    color: #e65100;
    margin-top: 0;
    font-size: 1.1rem;
}

/* 响应式导航菜单 */
.nav-toggle {
    display: none;
    background-color: #388e3c;
    color: #fff;
    border: none;
    padding: 10px;
    cursor: pointer;
    font-size: 1.2rem;
    margin: 10px;
    border-radius: 4px;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    nav ul {
        display: none;
        flex-direction: column;
        align-items: center;
        gap: 0;
    }
    
    nav ul.active {
        display: flex;
    }
}

/* 打印样式 */
@media print {
    nav {
        display: none;
    }
    
    header {
        padding: 10px 0;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    section {
        box-shadow: none;
        padding: 0;
    }
    
    footer {
        display: none;
    }
    
    .encouragement,
    .learning-tip,
    .progress-check {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* 工具页面样式 */
.tools-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.tool-card {
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.tool-card h3 {
    color: #333;
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.tool-card p {
    color: #666;
    margin-bottom: 15px;
}

.code-input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    margin-bottom: 15px;
    resize: vertical;
    min-height: 100px;
}

.result-container {
    background-color: #f2f2f2;
    padding: 15px;
    border-radius: 4px;
    margin-top: 15px;
    min-height: 50px;
}

/* 章节页面样式 */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    margin: 20px 0;
    flex-wrap: wrap;
    gap: 10px;
}

.chapter-nav a {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    background-color: #388e3c;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.chapter-nav a:hover {
    background-color: #2e7d32;
}

.chapter-nav img {
    margin: 0 5px;
}

/* 示例预览样式 */
.example-preview {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    margin: 15px 0;
    background-color: #f9f9f9;
}

.example-preview h4 {
    margin-top: 0;
    margin-bottom: 15px;
    color: #333;
}

/* 响应式设计示例样式 */
.responsive-example {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    margin: 15px 0;
    background-color: #f9f9f9;
}

.responsive-example .device-frame {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 10px;
    margin: 10px 0;
    background-color: #fff;
}

.responsive-example .mobile-frame {
    max-width: 320px;
    margin: 0 auto;
    border: 16px solid #333;
    border-radius: 36px;
    padding: 20px;
    background-color: #fff;
}

.responsive-example .tablet-frame {
    max-width: 768px;
    margin: 0 auto;
    border: 8px solid #333;
    border-radius: 16px;
    padding: 20px;
    background-color: #fff;
}

/* 动画示例样式 */
.animation-example {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    margin: 15px 0;
    background-color: #f9f9f9;
    text-align: center;
}

.animation-example .animated-box {
    width: 100px;
    height: 100px;
    background-color: #4caf50;
    margin: 0 auto;
    border-radius: 4px;
}

/* 盒模型示例样式 */
.box-model-example {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    margin: 15px 0;
    background-color: #f9f9f9;
}

.box-model-example .box {
    width: 200px;
    height: 200px;
    margin: 20px auto;
    padding: 20px;
    border: 5px solid #4caf50;
    background-color: #e8f5e8;
    text-align: center;
    line-height: 160px;
}

/* 颜色示例样式 */
.color-palette {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 15px 0;
}

.color-swatch {
    width: 100px;
    height: 100px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

/* 排版示例样式 */
.typography-example {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    margin: 15px 0;
    background-color: #f9f9f9;
}

/* Flexbox 示例样式 */
.flexbox-example {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    margin: 15px 0;
    background-color: #f9f9f9;
}

.flex-container {
    display: flex;
    gap: 10px;
    margin: 15px 0;
    padding: 10px;
    background-color: #e3f2fd;
    border-radius: 4px;
}

.flex-item {
    flex: 1;
    padding: 20px;
    background-color: #2196f3;
    color: #fff;
    border-radius: 4px;
    text-align: center;
}

/* Grid 示例样式 */
.grid-example {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    margin: 15px 0;
    background-color: #f9f9f9;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin: 15px 0;
    padding: 10px;
    background-color: #fff3e0;
    border-radius: 4px;
}

.grid-item {
    padding: 20px;
    background-color: #ff9800;
    color: #fff;
    border-radius: 4px;
    text-align: center;
}

/* 变量示例样式 */
.variables-example {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    margin: 15px 0;
    background-color: #f9f9f9;
}

/* 最佳实践示例样式 */
.best-practice-example {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    margin: 15px 0;
    background-color: #f9f9f9;
}

.best-practice-example .bad-example {
    padding: 15px;
    background-color: #ffebee;
    border-left: 4px solid #f44336;
    border-radius: 0 4px 4px 0;
    margin: 10px 0;
}

.best-practice-example .good-example {
    padding: 15px;
    background-color: #e8f5e8;
    border-left: 4px solid #4caf50;
    border-radius: 0 4px 4px 0;
    margin: 10px 0;
}

/* 联系信息样式 */
.contact-info {
    margin-top: 10px;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 卡片样式 */
.card {
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.card h3 {
    color: #333;
    margin-top: 0;
    margin-bottom: 15px;
}

.card p {
    color: #666;
    margin-bottom: 0;
}