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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --bg-color: #ffffff;
    --sidebar-bg: #f8fafc;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --hover-bg: #f1f5f9;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background-color: #f1f5f9;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏样式 */
.sidebar {
    width: 280px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-color);
}

.sidebar-header h1 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.subtitle {
    font-size: 13px;
    color: var(--text-secondary);
}

.search-container {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.search-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    background-color: var(--bg-color);
    color: var(--text-primary);
    transition: all 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.nav-menu {
    flex: 1;
    padding: 16px 0;
    overflow-y: auto;
}

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

.nav-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
    padding: 0 4px;
}

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

.nav-list li {
    margin-bottom: 4px;
}

/* 导航链接样式 */
.nav-link {
    display: block;
    padding: 12px 16px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    font-size: 16px;
    font-weight: 600;
}

/* ALL 链接特殊样式 */
.nav-link[data-category="all"] {
    font-size: 16px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: transparent;
    color: var(--text-primary);
    margin-bottom: 12px;
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.nav-link[data-category="all"]:hover {
    background: var(--hover-bg);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    border-color: var(--primary-color);
}

.nav-link[data-category="all"].active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}

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

.nav-link.active {
    background-color: var(--primary-color);
    color: white;
    font-weight: 700;  /* 激活状态更粗 */
}

.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 101;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow);
}

/* 主内容区样式 */
.main-content {
    flex: 1;
    margin-left: 280px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.top-bar {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: var(--shadow);
}

.top-bar h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

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

.file-list-container {
    flex: 1;
    padding: 24px 32px;
    overflow-y: auto;
}

.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.file-card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow);
}

.file-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.file-card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
}

/* 移除或注释掉 ::before */
/* .file-card-title::before {
    content: attr(data-icon);
    font-size: 24px;
    flex-shrink: 0;
} */

.file-card-path {
    font-size: 13px;
    color: var(--text-secondary);
    font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
    margin-bottom: 12px;
}

.file-card-category {
    display: inline-block;
    padding: 4px 10px;
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
    font-size: 16px;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-state-text {
    font-size: 16px;
}

/* 内容查看器样式 */
.content-viewer {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-color);
}

.viewer-header {
    padding: 16px 32px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-color);
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 16px;
}

/* 返回按钮优化为与ALL一致的样式 */
.back-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: linear-gradient(135deg, #e0e7ff 0%, #ede9fe 100%);
    border: none;
    border-radius: 999px;
    color: #6b21a8;
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    line-height: 1;
    box-shadow: 0 2px 8px rgba(167, 139, 250, 0.1);
    flex-shrink: 0;
}

.back-button:hover {
    background: linear-gradient(135deg, #c7d2fe 0%, #ddd6fe 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(167, 139, 250, 0.15);
}

.back-button:active {
    transform: translateY(0);
}

.back-button::before {
    content: "";
    width: 10px;
    height: 10px;
    border: 2px solid #6b21a8;
    border-right: 0;
    border-top: 0;
    transform: rotate(45deg);
    display: inline-block;
}

.viewer-header h3 {
    margin: 0;
    font-size: 22px;
    font-weight: 700;
    color: #111827;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 查看器布局：正文 + 目录 */
.viewer-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 350px;
    gap: 24px;
    padding: 0 24px 32px;  /* 移除顶部padding */
}

.viewer-content {
    flex: 1;
    padding: 16px 32px 32px;  /* 减小顶部padding从32px到16px */
    overflow-y: auto;
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
}

.toc-panel {
    position: sticky;
    top: 80px;  /* 减小从120px到80px */
    align-self: start;
    background: #ffffff;
    border: 1px solid #e5e7de;
    border-radius: 12px;
    padding: 16px;
    box-shadow: var(--shadow);
    max-height: calc(100vh - 120px);  /* 相应调整从160px到120px */
    display: flex;
    flex-direction: column;
    overflow: hidden;
    z-index: 5;
}

.toc-title {
    font-size: 14px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 10px;
    flex-shrink: 0;
}

.toc-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
    flex: 1;
    min-height: 0;
}

.toc-item {
    display: block;
    text-decoration: none;
    line-height: 1.4;
    padding: 5px 8px;
    border-radius: 8px;
    transition: background 0.15s ease, color 0.15s ease;
}

.toc-item:hover {
    background: #f3f4f6;
    color: #111827 !important;
}

.toc-item.active {
    background: rgba(37, 99, 235, 0.1);
    color: #1d4ed8 !important;
}

.toc-item.level-1.active {
    font-weight: 700;
}

.toc-item.level-2.active {
    font-weight: 600;
}

.toc-item.level-3.active {
    font-weight: 500;
}

.toc-item.level-1 {
    padding-left: 8px;
    font-size: 15px;
    font-weight: 700;
    color: #111827;
}

.toc-item.level-2 {
    padding-left: 18px;
    font-size: 14px;
    font-weight: 600;
    color: #374151;
}

.toc-item.level-3 {
    padding-left: 28px;
    font-size: 13px;
    font-weight: 400;
    color: #4b5563;
}

.toc-empty {
    font-size: 13px;
    color: #9ca3af;
}

@media (max-width: 1100px) {
    .viewer-layout {
        grid-template-columns: 1fr;
    }
    .toc-panel {
        display: none;
    }
}

/* Markdown 内容样式 */
.viewer-content h1,
.viewer-content h2,
.viewer-content h3,
.viewer-content h4 {
    margin-top: 24px;  /* 减小从32px到24px */
    margin-bottom: 16px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
}

.viewer-content h1 {
    font-size: 32px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 12px;
    margin-top: 0;  /* 第一个标题去除上边距 */
}

.viewer-content h2 {
    font-size: 28px;
    margin-top: 32px;  /* 减小从40px到32px */
}

.viewer-content h3 {
    font-size: 22px;
}

.viewer-content h4 {
    font-size: 18px;
}

.viewer-content p {
    margin-bottom: 16px;
    line-height: 1.8;
}

.viewer-content ul,
.viewer-content ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.viewer-content li {
    margin-bottom: 8px;
    line-height: 1.7;
}

/* 代码块样式优化 */
.viewer-content pre {
    background-color: #f6f8fa;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    padding: 16px;
    overflow-x: auto;
    margin: 16px 0;
    line-height: 1.6;
}

.viewer-content pre code {
    font-family: 'SF Mono', 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.6;
    color: #24292f;
    background: transparent;
    padding: 0;
    border: none;
    display: block;
    white-space: pre;
}

/* 行内代码样式 */
.viewer-content code {
    background-color: rgba(175, 184, 193, 0.2);
    padding: 3px 6px;
    border-radius: 3px;
    font-family: 'SF Mono', 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    color: #cf222e;
}

/* 代码块中的行内代码不需要特殊样式 */
.viewer-content pre code {
    background: transparent;
    padding: 0;
    color: inherit;
}

/* Markdown 基础样式优化 */
.viewer-content {
    font-size: 16px;
    line-height: 1.8;
    color: #24292f;
}

.viewer-content h1,
.viewer-content h2,
.viewer-content h3,
.viewer-content h4 {
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
}

.viewer-content p {
    margin-bottom: 16px;
}

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

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

.viewer-content blockquote {
    padding: 0 1em;
    color: #57606a;
    border-left: 4px solid #d0d7de;
    margin: 16px 0;
}

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

.viewer-content table th,
.viewer-content table td {
    padding: 8px 13px;
    border: 1px solid #d0d7de;
}

.viewer-content table th {
    background-color: #f6f8fa;
    font-weight: 600;
}

.viewer-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 20px 0;
    box-shadow: var(--shadow);
}

.viewer-content a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

.viewer-content a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.viewer-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 32px 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .top-bar {
        padding: 16px 20px;
    }
    
    .top-bar h2 {
        font-size: 20px;
    }
    
    .file-list-container {
        padding: 16px 20px;
    }
    
    .file-grid {
        grid-template-columns: 1fr;
    }
    
    .viewer-header {
        padding: 12px 20px;
        flex-wrap: wrap;
    }
    
    .viewer-header h3 {
        font-size: 18px;
    }
    
    .viewer-content {
        padding: 12px 20px 20px;  /* 移动端也减小顶部padding */
    }
}

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

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

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

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

/* Mermaid 图表样式 */
.viewer-content .mermaid {
    display: block;
    margin: 24px 0;
    padding: 16px;
    background-color: #f6f8fa;
    border: 1px solid #d0d7de;
    border-radius: 8px;
    text-align: center;
    overflow-x: auto;
}

.viewer-content .mermaid svg {
    max-width: 100%;
    height: auto;
}