/* CSS Variables for theming */
:root {
    --primary-color: #0066cc;
    --primary-color-rgb: 0, 102, 204;
    --secondary-color: #f8f9fa;
    --text-color: #333;
    --text-secondary: #666;
    --border-color: #e0e0e0;
    --sidebar-bg: #f8f9fa;
    --content-bg: #ffffff;
    --hover-color: #e3f2fd;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

/* Dark theme */
[data-theme="dark"] {
    --primary-color: #4fa8e6;
    --primary-color-rgb: 79, 168, 230;
    --secondary-color: #2d3748;
    --text-color: #e2e8f0;
    --text-secondary: #a0aec0;
    --border-color: #4a5568;
    --sidebar-bg: #1a202c;
    --content-bg: #2d3748;
    --hover-color: #4a5568;
    --shadow: 0 2px 10px rgba(0,0,0,0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--content-bg);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    display: flex;
    flex: 1;
}

/* Sidebar Styles */
.sidebar {
    width: 280px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: var(--transition);
    z-index: 1000;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 600;
}

.sidebar-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.sidebar-toggle span {
    width: 20px;
    height: 2px;
    background-color: var(--text-color);
    margin: 2px 0;
    transition: var(--transition);
}

.search-box {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
}

.search-box input {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--content-bg);
    color: var(--text-color);
    font-size: 14px;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-box button {
    padding: 10px 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
}

.nav-menu {
    padding: 20px 0;
}

/* Navigation Styles - 多层级支持 */
.nav-section {
    margin-bottom: 20px;
}

.nav-section h3,
.nav-title {
    padding: 18px 20px 12px;
    color: var(--text-color);
    font-size: 17px;
    font-weight: 800;
    letter-spacing: 0.3px;
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-radius: 8px;
    margin: 0 10px;
    background-color: var(--sidebar-bg);
    border: 1px solid transparent;
}

.nav-section h3:hover,
.nav-title:hover {
    background-color: var(--hover-color);
    color: var(--primary-color);
    border-color: var(--border-color);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.nav-section h3::after,
.nav-title::after {
    content: '▼';
    font-size: 12px;
    transition: transform 0.3s ease;
    color: var(--text-secondary);
}

.nav-section.collapsed h3::after,
.nav-section.collapsed .nav-title::after {
    transform: rotate(-90deg);
}

/* 多层级列表样式 */
.nav-list,
.nav-children {
    list-style: none;
    max-height: 500px;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    opacity: 1;
    padding-left: 0;
    margin: 0;
    position: relative;
}

/* 一级菜单内容区域背景 */
.nav-section .nav-list {
    background-color: var(--content-bg);
    border-radius: 6px;
    margin: 8px 10px 0 10px;
    padding: 8px 0;
    border: 1px solid var(--border-color);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
}

.nav-section.collapsed .nav-list,
.nav-children.collapsed {
    max-height: 0;
    opacity: 0;
    padding: 0;
    margin-top: 0;
}

/* 不同层级的缩进 - 支持无限层级 */
.nav-item.level-1,
.nav-children.level-1 {
    margin-left: 0;
}

.nav-item.level-2,
.nav-children.level-2 {
    margin-left: 30px;
}

.nav-item.level-3,
.nav-children.level-3 {
    margin-left: 50px;
}

.nav-item.level-4,
.nav-children.level-4 {
    margin-left: 70px;
}

.nav-item.level-5,
.nav-children.level-5 {
    margin-left: 90px;
}

.nav-item.level-6,
.nav-children.level-6 {
    margin-left: 110px;
}

/* 通用规则：每层级缩进20px */
.nav-item[class*="level-"],
.nav-children[class*="level-"] {
    position: relative;
}

/* 为深层级添加连接线指示 */
.nav-item.level-2::before,
.nav-item.level-3::before,
.nav-item.level-4::before,
.nav-item.level-5::before,
.nav-item.level-6::before {
    content: '';
    position: absolute;
    left: -15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, transparent 0%, var(--border-color) 20%, var(--border-color) 80%, transparent 100%);
    opacity: 0.4;
}

/* 为二级菜单添加特殊的连接线 */
.nav-item.level-2::before {
    left: -20px;
    width: 3px;
    background: linear-gradient(to bottom, transparent 0%, var(--primary-color) 15%, var(--primary-color) 85%, transparent 100%);
    opacity: 0.3;
}

/* 为每个二级菜单项添加水平连接线 */
.nav-item.level-2::after {
    content: '';
    position: absolute;
    left: -20px;
    top: 50%;
    width: 15px;
    height: 2px;
    background-color: var(--primary-color);
    opacity: 0.3;
    transform: translateY(-50%);
}

/* 三级及以下的水平连接线 */
.nav-item.level-3::after,
.nav-item.level-4::after,
.nav-item.level-5::after,
.nav-item.level-6::after {
    content: '';
    position: absolute;
    left: -15px;
    top: 50%;
    width: 12px;
    height: 1px;
    background-color: var(--border-color);
    opacity: 0.4;
    transform: translateY(-50%);
}

/* 导航链接样式 */
.nav-link,
.nav-group-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
    border-radius: 4px;
    margin: 2px 8px;
    position: relative;
}

.nav-link:hover,
.nav-group-title:hover {
    background-color: var(--hover-color);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
}

.nav-link.active {
    background-color: var(--hover-color);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
    font-weight: 600;
}

/* 不同层级的字体大小和样式 */
.nav-link.level-1,
.nav-group-title.level-1 {
    font-size: 15px;
    font-weight: 600;
    padding: 12px 16px;
    background-color: rgba(var(--primary-color-rgb), 0.05);
    border-left: 4px solid var(--primary-color);
    margin: 4px 12px;
}

.nav-link.level-2,
.nav-group-title.level-2 {
    font-size: 14px;
    font-weight: 500;
    padding: 10px 16px;
    background-color: var(--sidebar-bg);
    border-left: 3px solid transparent;
    margin: 2px 8px;
}

.nav-link.level-2:hover,
.nav-group-title.level-2:hover {
    background-color: var(--hover-color);
    border-left-color: var(--primary-color);
    transform: translateX(2px);
}

.nav-link.level-3,
.nav-group-title.level-3 {
    font-size: 13px;
    font-weight: 400;
    color: var(--text-secondary);
    padding: 8px 16px;
    background-color: transparent;
}

.nav-link.level-4,
.nav-group-title.level-4 {
    font-size: 12px;
    font-weight: 400;
    color: var(--text-secondary);
    padding: 8px 14px;
    background-color: transparent;
}

.nav-link.level-5,
.nav-group-title.level-5 {
    font-size: 12px;
    font-weight: 300;
    color: var(--text-secondary);
    padding: 6px 12px;
    opacity: 0.8;
    background-color: transparent;
}

.nav-link.level-6,
.nav-group-title.level-6 {
    font-size: 11px;
    font-weight: 300;
    color: var(--text-secondary);
    padding: 6px 10px;
    opacity: 0.7;
    background-color: transparent;
}

/* 展开/折叠箭头 */
.nav-toggle {
    font-size: 10px;
    margin-left: 8px;
    transition: transform 0.3s ease;
    color: var(--text-secondary);
    cursor: pointer;
}

.nav-toggle:hover {
    color: var(--primary-color);
}

/* 页面访问按钮 */
.nav-page-button {
    font-size: 12px;
    padding: 2px 6px;
    margin-left: 8px;
    margin-right: 4px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 3px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    opacity: 0.8;
}

.nav-page-button:hover {
    opacity: 1;
    background-color: var(--primary-color);
    transform: scale(1.05);
}

.nav-page-button:active {
    transform: scale(0.95);
}

/* 分组标题样式（无链接的项目） */
.nav-group-title {
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
}

.nav-group-title:hover {
    color: var(--text-color);
}

/* 有子项的链接和标题样式 */
.nav-link:has(.nav-toggle),
.nav-group-title:has(.nav-toggle) {
    cursor: pointer;
}

.nav-link:has(.nav-toggle):hover,
.nav-group-title:has(.nav-toggle):hover {
    background-color: var(--hover-color);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.content-header {
    background-color: var(--content-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-color);
}

.breadcrumb {
    font-size: 14px;
    color: var(--text-secondary);
}

.breadcrumb span:not(:first-child)::before {
    content: " > ";
    margin: 0 5px;
}

.header-actions {
    display: flex;
    gap: 10px;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: var(--transition);
    background-color: var(--content-bg);
}

.theme-toggle:hover {
    background-color: var(--hover-color);
}

.content {
    flex: 1;
    padding: 30px;
    max-width: none;
    overflow-x: auto;
}

/* Welcome Page Styles */
.welcome-page h1 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 2.5rem;
}

.welcome-page p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
}

.feature-card {
    background-color: var(--sidebar-bg);
    padding: 25px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.getting-started {
    margin-top: 40px;
    padding: 30px;
    background-color: var(--sidebar-bg);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.getting-started h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.getting-started ol {
    margin-left: 20px;
}

.getting-started li {
    margin-bottom: 10px;
    font-size: 1.05rem;
}

/* Content Styles */
.content h1, .content h2, .content h3, .content h4, .content h5, .content h6 {
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.content h1 {
    color: var(--primary-color);
    font-size: 2.2rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.content h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.content h3 {
    font-size: 1.4rem;
}

.content p {
    margin-bottom: 15px;
    line-height: 1.7;
}

.content code {
    background-color: var(--hover-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9em;
}

.content pre {
    background-color: var(--hover-color);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
    border: 1px solid var(--border-color);
}

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

.content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 20px;
    margin: 20px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.content ul, .content ol {
    margin: 15px 0 15px 25px;
}

.content li {
    margin-bottom: 8px;
}

.content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    border: 1px solid var(--border-color);
}

.content th, .content td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.content th {
    background-color: var(--hover-color);
    font-weight: 600;
}

/* 遮罩层（默认隐藏） */
.sidebar-overlay {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 100%;
        z-index: 1001;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .sidebar-toggle {
        display: flex;
    }
    
    .content {
        padding: 20px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .content-header {
        padding: 15px 20px;
    }
    
    /* 移动端遮罩层 */
    .sidebar-overlay {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 1000;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease, visibility 0.3s ease;
    }
    
    .sidebar-overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    /* 移动端缩进调整 */
    .nav-item.level-2,
    .nav-children.level-2 {
        margin-left: 20px;
    }

    .nav-item.level-3,
    .nav-children.level-3 {
        margin-left: 35px;
    }

    .nav-item.level-4,
    .nav-children.level-4 {
        margin-left: 50px;
    }

    .nav-item.level-5,
    .nav-children.level-5 {
        margin-left: 65px;
    }

    .nav-item.level-6,
    .nav-children.level-6 {
        margin-left: 80px;
    }
    
    /* 移动端链接样式调整 */
    .nav-link,
    .nav-group-title {
        padding: 8px 12px;
        margin: 1px 6px;
    }
    
    .nav-link.level-1,
    .nav-group-title.level-1 {
        padding: 10px 12px;
        margin: 3px 8px;
    }
    
    .nav-link.level-2,
    .nav-group-title.level-2 {
        padding: 8px 12px;
        margin: 2px 6px;
    }
    
    /* 移动端边线指示调整 */
    .nav-item.level-2::before {
        left: -15px;
        width: 2px;
    }
    
    .nav-item.level-2::after {
        left: -15px;
        width: 12px;
    }
    
    .nav-item.level-3::before,
    .nav-item.level-4::before,
    .nav-item.level-5::before,
    .nav-item.level-6::before {
        left: -12px;
    }
    
    .nav-item.level-3::after,
    .nav-item.level-4::after,
    .nav-item.level-5::after,
    .nav-item.level-6::after {
        left: -12px;
        width: 10px;
    }
}

@media (max-width: 480px) {
    .welcome-page h1 {
        font-size: 2rem;
    }
    
    .feature-card {
        padding: 20px;
    }
    
    .getting-started {
        padding: 20px;
    }
}

/* Scrollbar Styles */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--sidebar-bg);
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Footer Styles */
.footer {
    background-color: var(--sidebar-bg);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
    position: relative;
    z-index: 10;
}

.footer-content {
    padding: 20px 30px;
    text-align: center;
    margin-left: 280px;
    transition: var(--transition);
}

.footer-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.5;
}

/* 响应式设计中的footer */
@media (max-width: 768px) {
    .footer-content {
        margin-left: 0;
        padding: 20px;
        font-size: 0.85rem;
    }
}

/* Loading animation */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 200px;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.loading::after {
    content: '';
    width: 20px;
    height: 20px;
    margin-left: 10px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}