/* ==================== 
   One Dark Theme Variables
   ==================== */
:root {
    --bg-primary: #282c34;
    --bg-secondary: #21252b;
    --bg-tertiary: #2c313a;
    --bg-highlight: #3e4451;
    
    --text-primary: #abb2bf;
    --text-secondary: #5c6370;
    --text-muted: #4b5263;
    
    --accent-blue: #61afef;
    --accent-purple: #c678dd;
    --accent-green: #98c379;
    --accent-orange: #d19a66;
    --accent-red: #e06c75;
    --accent-cyan: #56b6c2;
    --accent-yellow: #e5c07b;
    
    --border-color: #3e4451;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s ease;
}

/* ==================== 
   Reset & Base
   ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Consolas', 'Monaco', 'Fira Code', monospace;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

/* ==================== 
   Navigation
   ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 30px;
    height: 50px;
}

.nav-container {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 6px;
}

.logo-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-blue);
}

.logo-text {
    color: var(--text-primary);
    font-size: 1rem;
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 5px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

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

.nav-link.active {
    color: var(--accent-blue);
    background: var(--bg-highlight);
}

.nav-github {
    font-size: 1.2rem;
    padding: 8px 12px;
}

/* ==================== 
   Home Page
   ==================== */
.home {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px 40px;
}

.home-content {
    text-align: center;
}

.avatar-container {
    margin-bottom: 30px;
}

.avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 3px solid var(--accent-blue);
    box-shadow: 0 0 30px rgba(97, 175, 239, 0.3);
}

.home-title {
    margin-bottom: 15px;
}

.greeting {
    display: block;
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 5px;
}

.name {
    font-size: 2.5rem;
    color: var(--accent-purple);
    font-weight: 700;
}

.home-subtitle {
    font-size: 1.1rem;
    color: var(--accent-green);
    margin-bottom: 40px;
    min-height: 1.5em;
}

.cursor {
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.home-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.home-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 30px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-width: 100px;
}

.home-link i {
    font-size: 1.5rem;
    color: var(--accent-blue);
}

.home-link span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.home-link:hover {
    border-color: var(--accent-blue);
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.home-link:hover i {
    color: var(--accent-purple);
}

.home-link:hover span {
    color: var(--text-primary);
}

.home-footer {
    position: absolute;
    bottom: 30px;
}

.comment {
    color: var(--text-muted);
    font-style: italic;
}

/* ==================== 
   Home Split Layout (左右两栏)
   ==================== */
.home-split {
    min-height: 100vh;
    display: flex;
    padding-top: 50px;
}

.home-left {
    width: 40%;
    min-width: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    border-right: 1px solid var(--border-color);
}

.profile-card {
    text-align: center;
    max-width: 350px;
}

.profile-card .avatar-container {
    margin-bottom: 25px;
}

.profile-card .home-title {
    margin-bottom: 15px;
}

.profile-card .home-subtitle {
    margin-bottom: 30px;
}

.profile-card .home-links {
    margin-bottom: 30px;
}

.profile-card .home-footer {
    position: relative;
    bottom: auto;
    margin-top: 20px;
}

.home-right {
    flex: 1;
    padding: 40px;
    overflow-y: auto;
    display: flex;
    align-items: center;
}

.skills-section {
    width: 100%;
    max-width: 600px;
}

.skills-title {
    font-size: 1.3rem;
    color: var(--accent-purple);
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.skills-title i {
    color: var(--accent-blue);
}

.skills-compact {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.skill-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px 20px;
    transition: var(--transition);
}

.skill-item:hover {
    border-color: var(--accent-blue);
    transform: translateX(5px);
}

.skill-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 600;
}

.skill-header i {
    font-size: 1rem;
}

/* Skill item colors */
.skill-item.frontend .skill-header i { color: var(--accent-blue); }
.skill-item.backend .skill-header i { color: var(--accent-green); }
.skill-item.database .skill-header i { color: var(--accent-cyan); }
.skill-item.devops .skill-header i { color: var(--accent-purple); }
.skill-item.tools .skill-header i { color: var(--accent-orange); }

.skill-item .skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-item .skill-tag {
    padding: 4px 10px;
    background: var(--bg-highlight);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.skill-item .skill-tag:hover {
    color: var(--accent-blue);
    background: var(--bg-tertiary);
}

/* ==================== 
   Page Layout
   ==================== */
.page {
    padding-top: 50px;
    min-height: 100vh;
}

.page-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

.page-header {
    margin-bottom: 40px;
}

.page-title {
    font-size: 1.8rem;
    color: var(--accent-purple);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.page-title i {
    color: var(--accent-blue);
}

.page-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ==================== 
   Content List (Blog/Notes)
   ==================== */
.content-section {
    margin-bottom: 40px;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.section-icon {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
}

.section-title {
    font-size: 1.1rem;
    color: var(--accent-orange);
    font-weight: 600;
}

.section-count {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-left: auto;
}

.content-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.content-item {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    background: var(--bg-secondary);
    border: 1px solid transparent;
    border-radius: 6px;
    transition: var(--transition);
}

.content-item:hover {
    border-color: var(--border-color);
    background: var(--bg-tertiary);
}

.item-icon {
    color: var(--accent-blue);
    margin-right: 12px;
    font-size: 0.9rem;
}

.item-title {
    flex: 1;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.item-date {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.content-item:hover .item-title {
    color: var(--accent-blue);
}

/* ==================== 
   Posts/Notes List Style (简洁时间线)
   ==================== */
.posts-container {
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* 分类标题 - 可折叠 */
.post-category-title {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 0;
    margin-top: 15px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-orange);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

.post-category-title:first-child {
    margin-top: 0;
}

.post-category-title:hover {
    color: var(--accent-blue);
}

.post-category-title i {
    color: var(--accent-blue);
}

.post-category-title .category-arrow {
    font-size: 0.7rem;
    transition: transform 0.2s ease;
}

.post-category-title.collapsed .category-arrow {
    transform: rotate(-90deg);
}

.post-category-title .category-count {
    margin-left: auto;
    padding: 2px 8px;
    background: var(--bg-highlight);
    color: var(--text-muted);
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: normal;
}

/* 分类下的文章容器 */
.category-posts {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 8px;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
}

.category-posts.collapsed {
    max-height: 0 !important;
    opacity: 0;
    padding-top: 0;
}

/* 文章条目 - 简洁行样式 */
.post-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 15px;
    background: var(--bg-secondary);
    border: 1px solid transparent;
    border-radius: 8px;
    transition: var(--transition);
    text-decoration: none;
}

.post-item:hover {
    border-color: var(--accent-blue);
    background: var(--bg-tertiary);
}

.post-title {
    flex: 1;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.post-item:hover .post-title {
    color: var(--accent-blue);
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.post-date {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-muted);
}

.post-date i {
    color: var(--accent-cyan);
    font-size: 0.7rem;
}

.post-date.updated {
    color: var(--accent-green);
}

.post-date.updated i {
    color: var(--accent-green);
}

.post-tags {
    display: flex;
    gap: 5px;
    flex-shrink: 0;
}

.post-tag {
    padding: 2px 8px;
    background: var(--bg-highlight);
    border-radius: 3px;
    font-size: 0.7rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.post-item:hover .post-tag {
    color: var(--accent-cyan);
}

/* 响应式 - 移动端改为卡片布局 */
@media (max-width: 768px) {
    .post-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .post-title {
        white-space: normal;
    }
    
    .post-meta {
        flex-wrap: wrap;
        gap: 10px;
    }
}

/* ==================== 
   Skills Page
   ==================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.skill-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
}

.skill-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.skill-card-icon {
    font-size: 1.2rem;
}

.skill-card-title {
    font-size: 1rem;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    padding: 5px 12px;
    background: var(--bg-highlight);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.skill-tag:hover {
    color: var(--accent-blue);
    background: var(--bg-tertiary);
}

/* Skill card colors */
.skill-card.frontend .skill-card-icon { color: var(--accent-blue); }
.skill-card.backend .skill-card-icon { color: var(--accent-green); }
.skill-card.devops .skill-card-icon { color: var(--accent-purple); }
.skill-card.tools .skill-card-icon { color: var(--accent-orange); }

/* ==================== 
   Article Page
   ==================== */
.article-page {
    padding-top: 50px;
    min-height: 100vh;
}

.article-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

.article-header {
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.article-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.article-meta i {
    color: var(--accent-blue);
}

.article-title {
    font-size: 2rem;
    color: var(--accent-purple);
    line-height: 1.4;
}

.article-tags {
    display: flex;
    gap: 8px;
    margin-top: 15px;
}

.article-tag {
    padding: 4px 10px;
    background: var(--bg-highlight);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--accent-cyan);
}

/* Markdown Content */
.markdown-body {
    color: var(--text-primary);
    line-height: 1.8;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    color: var(--accent-orange);
    margin: 30px 0 15px;
    font-weight: 600;
}

.markdown-body h1 { font-size: 1.8rem; }
.markdown-body h2 { font-size: 1.5rem; }
.markdown-body h3 { font-size: 1.2rem; }
.markdown-body h4 { font-size: 1.1rem; }
.markdown-body h5 { font-size: 1rem; }
.markdown-body h6 { font-size: 0.9rem; color: var(--text-secondary); }

.markdown-body p {
    margin-bottom: 15px;
}

.markdown-body a {
    color: var(--accent-blue);
}

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

.markdown-body code {
    background: var(--bg-highlight);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9em;
    color: var(--accent-red);
    font-family: 'Consolas', 'Monaco', 'Fira Code', 'JetBrains Mono', monospace;
}

.markdown-body pre {
    background: #282c34;  /* One Dark 背景色 */
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0;
    overflow-x: auto;
    margin: 20px 0;
    position: relative;
}

.markdown-body pre code {
    background: transparent;
    padding: 20px;
    color: #abb2bf;  /* One Dark 文字色 */
    display: block;
    font-size: 0.9em;
    line-height: 1.6;
    font-family: 'Consolas', 'Monaco', 'Fira Code', 'JetBrains Mono', monospace;
}

/* Highlight.js 代码块样式覆盖 */
.markdown-body pre code.hljs {
    padding: 20px;
    background: #282c34;
}

/* 代码块语言标签 */
.markdown-body pre code::before {
    content: attr(class);
    position: absolute;
    top: 0;
    right: 0;
    padding: 4px 10px;
    font-size: 0.7em;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.3);
    border-radius: 0 8px 0 6px;
    text-transform: uppercase;
}

.markdown-body pre code[class*="language-"]::before {
    content: attr(data-language);
}

/* 隐藏默认 hljs 类名显示 */
.markdown-body pre code.hljs::before {
    display: none;
}

.markdown-body blockquote {
    border-left: 3px solid var(--accent-blue);
    padding-left: 20px;
    margin: 20px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.markdown-body ul,
.markdown-body ol {
    padding-left: 25px;
    margin: 15px 0;
}

.markdown-body li {
    margin-bottom: 8px;
}

.markdown-body img {
    max-width: 100%;
    border-radius: 6px;
    margin: 20px 0;
}

.markdown-body hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 30px 0;
}

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.markdown-body th,
.markdown-body td {
    border: 1px solid var(--border-color);
    padding: 10px 15px;
    text-align: left;
}

.markdown-body th {
    background: var(--bg-secondary);
    color: var(--accent-purple);
}

/* Article Navigation */
.article-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.article-nav-link {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 15px;
    background: var(--bg-secondary);
    border-radius: 6px;
    max-width: 45%;
}

.article-nav-link:hover {
    background: var(--bg-tertiary);
}

.nav-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.nav-title {
    font-size: 0.95rem;
    color: var(--accent-blue);
}

/* ==================== 
   Empty State
   ==================== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--border-color);
}

.empty-state p {
    font-size: 0.95rem;
}

/* ==================== 
   Back to Top
   ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

/* ==================== 
   Loading Placeholder
   ==================== */
.loading-placeholder {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.loading-placeholder i {
    margin-right: 8px;
}

/* ==================== 
   Responsive
   ==================== */
@media (max-width: 768px) {
    /* 首页左右布局变上下 */
    .home-split {
        flex-direction: column;
    }
    
    .home-left {
        width: 100%;
        min-width: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 30px 20px;
    }
    
    .home-right {
        padding: 30px 20px;
    }
    
    .skills-section {
        max-width: 100%;
    }
    
    .nav-menu {
        gap: 0;
    }
    
    .nav-link {
        padding: 8px 10px;
        font-size: 0.85rem;
    }
    
    .nav-link span {
        display: none;
    }
    
    .nav-link i {
        font-size: 1.1rem;
    }
    
    .name {
        font-size: 2rem;
    }
    
    .home-links {
        gap: 15px;
    }
    
    .home-link {
        padding: 15px 20px;
    }
    
    .page-title {
        font-size: 1.5rem;
    }
    
    .article-title {
        font-size: 1.5rem;
    }
    
    .article-nav {
        flex-direction: column;
        gap: 15px;
    }
    
    .article-nav-link {
        max-width: 100%;
    }
}

/* ==================== 
   Article Three-Column Layout
   ==================== */
.article-layout {
    display: flex;
    padding-top: 50px;
    min-height: 100vh;
}

/* 侧边栏通用样式 */
.sidebar-left,
.sidebar-right {
    background: var(--bg-secondary);
    height: calc(100vh - 50px);
    position: sticky;
    top: 50px;
    overflow-y: auto;
    transition: width 0.3s ease, min-width 0.3s ease, opacity 0.3s ease;
}

/* 左侧边栏 - 文章列表 */
.sidebar-left {
    width: 240px;
    min-width: 240px;
    border-right: 1px solid var(--border-color);
}

.sidebar-left.collapsed {
    width: 0;
    min-width: 0;
    overflow: hidden;
    border-right: none;
}

/* 右侧边栏 - 目录 */
.sidebar-right {
    width: 220px;
    min-width: 220px;
    border-left: 1px solid var(--border-color);
}

.sidebar-right.collapsed {
    width: 0;
    min-width: 0;
    overflow: hidden;
    border-left: none;
}

/* 侧边栏头部 */
.sidebar-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 15px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.sidebar-header i {
    color: var(--accent-blue);
}

/* 展开/收起全部按钮 */
.sidebar-toggle-all {
    margin-left: auto;
    display: flex;
    align-items: center;
}

.sidebar-toggle-all button {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px 8px;
    font-size: 0.7rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 4px;
}

.sidebar-toggle-all button:hover {
    background: var(--bg-highlight);
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

.sidebar-toggle-all button i {
    font-size: 0.65rem;
}

/* 侧边栏切换按钮 - 放在分界线上 */
.sidebar-toggle {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 50px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    z-index: 100;
    transition: all 0.3s ease;
}

.sidebar-toggle:hover {
    color: var(--accent-blue);
    border-color: var(--accent-blue);
    background: var(--bg-highlight);
}

/* 左侧按钮 - 贴在左侧栏右边界 */
.sidebar-toggle-left {
    left: 239px;
    border-radius: 0 4px 4px 0;
    border-left: none;
}

.sidebar-toggle-left.collapsed {
    left: 0;
    border-radius: 0 4px 4px 0;
    border-left: 1px solid var(--border-color);
}

/* 右侧按钮 - 贴在右侧栏左边界 */
.sidebar-toggle-right {
    right: 219px;
    border-radius: 4px 0 0 4px;
    border-right: none;
}

.sidebar-toggle-right.collapsed {
    right: 0;
    border-radius: 4px 0 0 4px;
    border-right: 1px solid var(--border-color);
}

.sidebar-content {
    padding: 10px 0;
}

/* 左侧文章列表样式 */
.sidebar-year {
    padding: 10px 15px 5px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-purple);
}

/* 笔记侧边栏分类折叠 */
.sidebar-category {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 15px 5px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-orange);
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

.sidebar-category:hover {
    color: var(--accent-blue);
}

.sidebar-category i {
    font-size: 0.7rem;
    color: var(--accent-blue);
}

.sidebar-category .sidebar-cat-arrow {
    transition: transform 0.2s ease;
}

.sidebar-category.collapsed .sidebar-cat-arrow {
    transform: rotate(-90deg);
}

.sidebar-category .sidebar-cat-count {
    margin-left: auto;
    padding: 1px 6px;
    background: var(--bg-highlight);
    color: var(--text-muted);
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: normal;
}

.sidebar-cat-items {
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    margin-left: 15px;  /* 整体缩进 */
    border-left: 1px solid var(--bg-highlight);  /* 左侧连接线 */
    padding-left: 0;
}

.sidebar-cat-items.collapsed {
    max-height: 0 !important;
    opacity: 0;
}

.sidebar-item {
    display: block;
    padding: 6px 15px 6px 15px;  /* 因为父级已有缩进，这里不需要额外左缩进 */
    font-size: 0.8rem;
    color: #ffffff;
    transition: var(--transition);
    border-left: 2px solid transparent;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-left: -1px;  /* 覆盖父级的边框 */
}

.sidebar-item:hover {
    background: var(--bg-highlight);
    color: var(--text-primary);
}

.sidebar-item.active {
    background: var(--bg-highlight);
    color: var(--accent-blue);
    border-left-color: var(--accent-blue);
}

/* 中间内容区 */
.article-main {
    flex: 1;
    min-width: 0;
    padding: 40px;
    max-width: 900px;
    margin: 0 auto;
}

.article-main .article-container {
    max-width: 100%;
    padding: 0;
}

.article-main .article-header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.article-main .article-title {
    font-size: 1.8rem;
    margin-bottom: 15px;
}

.article-main .article-meta {
    margin-bottom: 0;
}

.reading-progress {
    margin-left: 8px;
    font-size: 0.75rem;
    color: var(--accent-cyan);
    font-weight: normal;
}

/* 目录样式 - 简洁风格 */
.toc-content {
    padding: 10px 0;
    font-family: 'Consolas', 'Monaco', 'Fira Code', monospace;
}

.toc-empty {
    padding: 15px;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-align: left;
}

.toc-list {
    list-style: none;
    padding: 0 8px;
    margin: 0;
}

.toc-item {
    position: relative;
}

/* 不同层级的缩进 */
.toc-item.toc-level-1 { padding-left: 0; }
.toc-item.toc-level-2 { padding-left: 8px; }
.toc-item.toc-level-3 { padding-left: 24px; }
.toc-item.toc-level-4 { padding-left: 40px; }
.toc-item.toc-level-5 { padding-left: 56px; }
.toc-item.toc-level-6 { padding-left: 72px; }

.toc-link {
    display: flex;
    align-items: center;
    padding: 5px 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: var(--transition);
    text-align: left;
    line-height: 1.4;
    border-radius: 4px;
    position: relative;
}

.toc-link:hover {
    color: var(--text-primary);
    background: var(--bg-highlight);
}

.toc-link.active {
    color: var(--accent-blue);
    background: var(--bg-highlight);
}

/* 目录图标 */
.toc-icon {
    width: 16px;
    height: 16px;
    margin-right: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.toc-item.toc-level-1 .toc-icon {
    color: var(--accent-purple);
}

.toc-item.toc-level-2 .toc-icon {
    color: var(--accent-blue);
}

.toc-item.toc-level-3 .toc-icon,
.toc-item.toc-level-4 .toc-icon {
    color: var(--accent-cyan);
}

.toc-link.active .toc-icon {
    color: var(--accent-blue);
}

.toc-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: left;
}

/* 不同层级的样式 */
.toc-item.toc-level-1 > .toc-link { 
    font-weight: 600; 
    font-size: 0.85rem;
    color: var(--text-primary);
    padding: 6px 8px;
    margin-bottom: 2px;
}

.toc-item.toc-level-2 > .toc-link { 
    font-size: 0.8rem; 
    color: var(--text-primary);
}

.toc-item.toc-level-3 > .toc-link { 
    font-size: 0.78rem; 
    color: var(--text-secondary);
}

.toc-item.toc-level-4 > .toc-link,
.toc-item.toc-level-5 > .toc-link,
.toc-item.toc-level-6 > .toc-link { 
    font-size: 0.75rem; 
    color: var(--text-muted);
}

/* 三栏布局响应式 */
@media (max-width: 1400px) {
    .sidebar-left {
        width: 220px;
        min-width: 220px;
    }
    
    .sidebar-right {
        width: 200px;
        min-width: 200px;
    }
}

@media (max-width: 1100px) {
    .sidebar-left {
        display: none;
    }
    
    .article-main {
        padding: 30px;
    }
}

@media (max-width: 900px) {
    .sidebar-right {
        display: none;
    }
    
    .article-main {
        padding: 20px;
    }
}