/* ==================== CSS 变量定义 ==================== */
:root {
    /* 明亮主题 */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f7fa;
    --bg-tertiary: #e8ecf1;
    --text-primary: #2c3e50;
    --text-secondary: #5a6c7d;
    --text-tertiary: #8492a6;
    --border-color: #dfe4ea;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --code-bg: #f6f8fa;
    --code-border: #e1e4e8;
    --sidebar-width: 280px;
    --toc-width: 240px;
    --header-height: 60px;
}

/* 暗黑主题 */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #242424;
    --bg-tertiary: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --border-color: #3a3a3a;
    --accent-color: #60a5fa;
    --accent-hover: #3b82f6;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --code-bg: #2d2d2d;
    --code-border: #3a3a3a;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* ==================== 应用容器 ==================== */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ==================== 顶部工具栏 ==================== */
.header {
    height: var(--header-height);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all 0.3s;
}

.site-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box input {
    width: 300px;
    padding: 8px 35px 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.3s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-icon {
    position: absolute;
    right: 10px;
    pointer-events: none;
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background-color 0.3s;
    font-size: 20px;
}

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

/* ==================== 主内容区域 ==================== */
.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ==================== 左侧导航栏 ==================== */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 20px 0;
}

.nav-tree {
    padding: 0 10px;
}

.nav-item {
    margin: 2px 0;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s;
    cursor: pointer;
    font-size: 14px;
}

.nav-link:hover {
    background-color: var(--bg-secondary);
    color: var(--accent-color);
}

.nav-link.active {
    background-color: var(--accent-color);
    color: white;
}

.nav-folder {
    margin: 2px 0;
}

.folder-toggle {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
    font-weight: 500;
    font-size: 14px;
}

.folder-toggle:hover {
    background-color: var(--bg-secondary);
}

.folder-icon {
    margin-right: 8px;
    transition: transform 0.2s;
    display: inline-block;
}

.folder-icon.expanded {
    transform: rotate(90deg);
}

.folder-children {
    padding-left: 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.folder-children.expanded {
    max-height: 2000px;
}

/* ==================== 中间内容区域 ==================== */
.content {
    flex: 1;
    background-color: var(--bg-primary);
    overflow-y: auto;
    padding: 40px;
}

.welcome {
    max-width: 900px;
    margin: 0 auto;
}

.welcome h1 {
    font-size: 36px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.feature-item {
    padding: 24px;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.feature-item h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

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

/* Markdown 内容样式 */
.markdown-body {
    max-width: 900px;
    margin: 0 auto;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
    color: var(--text-primary);
}

.markdown-body h1 {
    font-size: 2em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
}

.markdown-body h2 {
    font-size: 1.5em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
}

.markdown-body h3 {
    font-size: 1.25em;
}

.markdown-body p {
    margin-bottom: 16px;
}

.markdown-body a {
    color: var(--accent-color);
    text-decoration: none;
}

.markdown-body a:hover {
    text-decoration: underline;
}

.markdown-body code {
    background-color: var(--code-bg);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    border: 1px solid var(--code-border);
}

.markdown-body pre {
    background-color: var(--code-bg);
    padding: 16px;
    border-radius: 6px;
    overflow-x: auto;
    margin: 16px 0;
    border: 1px solid var(--code-border);
}

.markdown-body pre code {
    background: none;
    padding: 0;
    border: none;
}

.markdown-body blockquote {
    padding: 0 1em;
    color: var(--text-secondary);
    border-left: 4px solid var(--border-color);
    margin: 16px 0;
}

.markdown-body table {
    border-collapse: collapse;
    width: 100%;
    margin: 16px 0;
}

.markdown-body table th,
.markdown-body table td {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
}

.markdown-body table th {
    background-color: var(--bg-secondary);
    font-weight: 600;
}

.markdown-body ul,
.markdown-body ol {
    padding-left: 2em;
    margin-bottom: 16px;
}

.markdown-body img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 16px 0;
}

.markdown-body hr {
    height: 1px;
    background-color: var(--border-color);
    border: none;
    margin: 24px 0;
}

/* ==================== 右侧目录 ==================== */
.toc {
    width: var(--toc-width);
    background-color: var(--bg-primary);
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 20px;
}

.toc-header {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 15px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.toc-nav {
    font-size: 14px;
}

.toc-item {
    margin: 4px 0;
}

.toc-link {
    display: block;
    padding: 4px 0;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.toc-link:hover {
    color: var(--accent-color);
}

.toc-link.active {
    color: var(--accent-color);
    font-weight: 500;
}

.toc-link.level-2 {
    padding-left: 0;
}

.toc-link.level-3 {
    padding-left: 15px;
}

.toc-link.level-4 {
    padding-left: 30px;
}

.toc-empty {
    color: var(--text-tertiary);
    font-size: 14px;
}

/* ==================== 搜索结果面板 ==================== */
.search-results {
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: 400px;
    height: calc(100vh - var(--header-height));
    background-color: var(--bg-primary);
    border-left: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    z-index: 99;
    display: flex;
    flex-direction: column;
}

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

.search-results-header h3 {
    font-size: 18px;
    color: var(--text-primary);
}

.close-search {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.close-search:hover {
    background-color: var(--bg-secondary);
}

.search-results-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.search-result-item {
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 10px;
    background-color: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid var(--border-color);
}

.search-result-item:hover {
    border-color: var(--accent-color);
    box-shadow: var(--shadow-sm);
}

.search-result-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.search-result-path {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-bottom: 8px;
}

.search-result-snippet {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.search-highlight {
    background-color: rgba(59, 130, 246, 0.3);
    padding: 2px 4px;
    border-radius: 2px;
    font-weight: 500;
}

.no-results {
    text-align: center;
    color: var(--text-tertiary);
    padding: 40px 20px;
}

/* ==================== 加载状态 ==================== */
.loading {
    text-align: center;
    color: var(--text-tertiary);
    padding: 20px;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
    .toc {
        display: none;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .sidebar {
        position: fixed;
        left: -280px;
        top: var(--header-height);
        height: calc(100vh - var(--header-height));
        z-index: 98;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s;
    }

    .sidebar.open {
        left: 0;
    }

    .search-box input {
        width: 200px;
    }

    .content {
        padding: 20px;
    }

    .search-results {
        width: 100%;
    }

    .site-title {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .search-box {
        display: none;
    }

    .content {
        padding: 15px;
    }

    .welcome h1 {
        font-size: 28px;
    }

    .features {
        grid-template-columns: 1fr;
    }
}

/* ==================== 滚动条样式 ==================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* ==================== 动画 ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}