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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* 顶部导航栏 */
.site-header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.site-header nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.site-header nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.site-header nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.site-header nav span {
    color: rgba(255, 255, 255, 0.5);
}

/* 移动端菜单按钮 */
.mobile-menu-toggle,
.toc-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

.toc-toggle {
    font-size: 1.8rem;
}

.mobile-menu-toggle {
    flex-direction: column;
    gap: 4px;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: white;
    transition: all 0.3s;
}

/* 主容器布局 */
.site-container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

/* 主内容区 */
.main-content {
    flex: 1;
    min-width: 0;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* 目录侧边栏（右侧） */
.toc-sidebar {
    width: 280px;
    flex-shrink: 0;
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: width 0.3s ease, opacity 0.3s ease;
}

.toc-sidebar .toc-wrapper {
    position: relative;
}

/* 目录收起状态 */
.toc-sidebar.collapsed {
    width: 50px;
    overflow: hidden;
}

.toc-sidebar.collapsed .toc-wrapper {
    padding: 1rem 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toc-sidebar.collapsed .toc-header {
    margin: 0;
    width: 100%;
    justify-content: center;
}

.toc-sidebar.collapsed .toc-title,
.toc-sidebar.collapsed .toc-nav {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.toc-sidebar.collapsed .toc-collapse-btn {
    margin: 0;
}

.toc-wrapper {
    padding: 1.5rem;
}

.toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.toc-title {
    font-size: 1.2rem;
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
    flex: 1;
}

/* 目录收起/展开按钮 */
.toc-collapse-btn {
    background: none;
    border: none;
    color: #3498db;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    margin-left: 0.5rem;
    border-radius: 4px;
    transition: background-color 0.3s, transform 0.3s;
    line-height: 1;
    flex-shrink: 0;
}

.toc-collapse-btn:hover {
    background-color: #e8f4fd;
    transform: scale(1.1);
}

.toc-collapse-btn:active {
    transform: scale(0.95);
}

.collapse-icon {
    display: inline-block;
    font-weight: bold;
}

/* 收起状态时的按钮样式 */
.toc-sidebar.collapsed .toc-collapse-btn {
    background-color: #3498db;
    color: white;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.toc-sidebar.collapsed .toc-collapse-btn:hover {
    background-color: #2980b9;
}

/* 收起状态指示器 */
.toc-collapsed-indicator {
    display: none;
    position: absolute;
    top: 120px;
    left: 50%;
    transform: translateX(-50%) rotate(90deg);
    transform-origin: center;
    color: #3498db;
    font-size: 0.9rem;
    font-weight: bold;
    white-space: nowrap;
    letter-spacing: 0.3em;
    pointer-events: none;
    opacity: 0.7;
}

.toc-sidebar.collapsed .toc-collapsed-indicator {
    display: block;
}

.toc-nav {
    font-size: 0.9rem;
}

.toc-list {
    list-style: none;
}

.toc-item {
    margin: 0.5rem 0;
}

.toc-level-1 { padding-left: 0; }
.toc-level-2 { padding-left: 1rem; }
.toc-level-3 { padding-left: 2rem; }
.toc-level-4 { padding-left: 3rem; }
.toc-level-5 { padding-left: 4rem; }
.toc-level-6 { padding-left: 5rem; }

.toc-link {
    display: block;
    color: #555;
    text-decoration: none;
    padding: 0.3rem 0.5rem;
    border-left: 3px solid transparent;
    transition: all 0.3s;
    border-radius: 4px;
}

.toc-link:hover {
    color: #3498db;
    background-color: #f0f8ff;
    border-left-color: #3498db;
}

.toc-link.active {
    color: #3498db;
    font-weight: bold;
    background-color: #e8f4fd;
    border-left-color: #3498db;
}

/* 主内容区（已在前面定义） */
.content-wrapper {
    padding: 2rem;
}

.content-wrapper h1,
.content-wrapper h2,
.content-wrapper h3,
.content-wrapper h4,
.content-wrapper h5,
.content-wrapper h6 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    color: #2c3e50;
    line-height: 1.3;
}

.content-wrapper h1 {
    font-size: 2.5rem;
    border-bottom: 3px solid #3498db;
    padding-bottom: 0.5rem;
}

.content-wrapper h2 {
    font-size: 2rem;
    border-bottom: 2px solid #ecf0f1;
    padding-bottom: 0.5rem;
}

.content-wrapper h3 { font-size: 1.5rem; }
.content-wrapper h4 { font-size: 1.3rem; }
.content-wrapper h5 { font-size: 1.1rem; }
.content-wrapper h6 { font-size: 1rem; }

.content-wrapper p {
    margin-bottom: 1rem;
}

.content-wrapper a {
    color: #3498db;
    text-decoration: none;
}

.content-wrapper a:hover {
    text-decoration: underline;
}

.content-wrapper ul,
.content-wrapper ol {
    margin: 1rem 0 1rem 2rem;
}

.content-wrapper li {
    margin: 0.5rem 0;
}

.content-wrapper code {
    background-color: #f4f4f4;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
}

.content-wrapper pre {
    background-color: #f4f4f4;
    padding: 1rem;
    border-radius: 5px;
    overflow-x: auto;
    margin: 1rem 0;
}

.content-wrapper pre code {
    background: none;
    padding: 0;
}

.content-wrapper blockquote {
    border-left: 4px solid #3498db;
    padding-left: 1rem;
    margin: 1rem 0;
    color: #666;
    font-style: italic;
}

.content-wrapper img {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
    margin: 1rem 0;
}

.content-wrapper table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.content-wrapper table th,
.content-wrapper table td {
    border: 1px solid #ddd;
    padding: 0.75rem;
    text-align: left;
}

.content-wrapper table th {
    background-color: #f4f4f4;
    font-weight: bold;
}

/* 平板设备 (768px - 1024px) */
@media screen and (max-width: 1024px) {
    .toc-sidebar {
        width: 240px;
    }
    
    .toc-sidebar.collapsed {
        width: 45px;
    }
    
    .content-wrapper h1 {
        font-size: 2rem;
    }
    
    .content-wrapper h2 {
        font-size: 1.75rem;
    }
}

/* 中等屏幕优化 (769px - 1024px) */
@media screen and (min-width: 769px) and (max-width: 1024px) {
    .site-container {
        gap: 1.5rem;
    }
    
    .toc-wrapper {
        padding: 1rem;
    }
}

/* 手机设备 (最大 768px) */
@media screen and (max-width: 768px) {
    .site-container {
        flex-direction: column;
        margin: 1rem auto;
        gap: 0;
    }
    
    /* 显示移动端按钮 */
    .mobile-menu-toggle,
    .toc-toggle {
        display: flex;
    }
    
    /* 目录按钮靠右 */
    .header-container {
        justify-content: space-between;
    }
    
    .toc-toggle {
        margin-left: auto;
    }
    
    /* 移动端导航 */
    .site-header nav {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 80%;
        max-width: 300px;
        height: calc(100vh - 60px);
        background-color: #2c3e50;
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem;
        transition: left 0.3s;
        box-shadow: 2px 0 5px rgba(0,0,0,0.2);
        overflow-y: auto;
    }
    
    .site-header nav.active {
        left: 0;
    }
    
    .site-header nav span {
        display: none;
    }
    
    .site-header nav a {
        width: 100%;
        display: block;
    }
    
    /* 移动端目录 */
    .toc-sidebar {
        position: fixed;
        top: 60px;
        right: -100%;
        width: 80% !important;
        max-width: 300px;
        height: calc(100vh - 60px);
        z-index: 999;
        transition: right 0.3s;
        box-shadow: -2px 0 5px rgba(0,0,0,0.2);
        overflow-y: auto;
    }
    
    .toc-sidebar.mobile-active {
        right: 0;
    }
    
    /* 移动端强制展开目录 */
    .toc-sidebar.collapsed {
        width: 80% !important;
    }
    
    .toc-sidebar.collapsed .toc-wrapper {
        padding: 1.5rem;
        display: block;
    }
    
    .toc-sidebar.collapsed .toc-header {
        margin-bottom: 1rem;
        display: flex;
        justify-content: space-between;
    }
    
    .toc-sidebar.collapsed .toc-title,
    .toc-sidebar.collapsed .toc-nav {
        opacity: 1;
        visibility: visible;
    }
    
    /* 移动端隐藏收起按钮 */
    .toc-collapse-btn {
        display: none;
    }
    
    /* 移动端目录标题占满整行 */
    .toc-header {
        margin-bottom: 1rem;
    }
    
    .toc-title {
        flex: 1;
    }
    
    /* 主内容 */
    .main-content {
        width: 100%;
        border-radius: 0;
    }
    
    .content-wrapper {
        padding: 1rem;
    }
    
    .content-wrapper h1 {
        font-size: 1.75rem;
    }
    
    .content-wrapper h2 {
        font-size: 1.5rem;
    }
    
    .content-wrapper h3 {
        font-size: 1.25rem;
    }
    
    .content-wrapper pre {
        padding: 0.75rem;
        font-size: 0.85rem;
    }
}

/* 小手机设备 (最大 480px) */
@media screen and (max-width: 480px) {
    .header-container {
        padding: 0 0.5rem;
    }
    
    .content-wrapper {
        padding: 0.75rem;
    }
    
    .content-wrapper h1 {
        font-size: 1.5rem;
    }
    
    .content-wrapper h2 {
        font-size: 1.3rem;
    }
    
    .content-wrapper table {
        font-size: 0.85rem;
    }
    
    .content-wrapper table th,
    .content-wrapper table td {
        padding: 0.5rem;
    }
}

/* 滚动条美化 */
.toc-sidebar::-webkit-scrollbar {
    width: 6px;
}

.toc-sidebar::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.toc-sidebar::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 3px;
}

.toc-sidebar::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* 打印样式 */
@media print {
    .site-header,
    .toc-sidebar,
    .mobile-menu-toggle,
    .toc-toggle {
        display: none;
    }
    
    .main-content {
        box-shadow: none;
        max-width: 100%;
    }
}