/* ═════════════════════════════════════
   彾九平博客 — 三栏布局
   左：TOC 目录 | 中：主要内容 | 右：个人信息+推荐文章
   ═════════════════════════════════════ */

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

:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --bg-color: #ffffff;
    --text-color: #1e293b;
    --light-bg: #f8fafc;
    --border-color: #e2e8f0;
    --code-bg: #f5f5f5;
    --code-text: #24292e;
    --sidebar-width: 260px;
    --content-max: 760px;
}

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

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

a:hover {
    opacity: 0.85;
}

/* ═════════════════════════════════════
   主布局：左 TOC + 中内容 + 右边栏
   ═════════════════════════════════════ */
.main-layout {
    display: flex;
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 1.5rem;
    justify-content: center;
    align-items: flex-start;
}

/* 中间内容区 */
.content-area {
    flex: 0 0 auto;
    width: 1000px;
    max-width: 100%;
    margin: 0 auto;
}

/* ═════════════════════════════════════
   左侧 TOC 目录
   ═════════════════════════════════════ */
.toc-sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    position: sticky;
    top: 2rem;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    padding: 1.2rem 1rem;
    background: var(--light-bg);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    font-size: 0.88rem;
    align-self: flex-start;
}

.toc-title {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 0.8rem;
    color: var(--primary-color);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

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

.toc-list li {
    margin-bottom: 0.4rem;
}

.toc-list a {
    display: block;
    padding: 0.35rem 0.6rem;
    color: var(--secondary-color);
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.2s;
    line-height: 1.4;
}

.toc-list a:hover {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
}

/* ═════════════════════════════════════
   右侧边栏（头像+导航+推荐文章）
   ═════════════════════════════════════ */
.right-sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    position: sticky;
    top: 2rem;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    padding: 1.5rem 1.2rem;
    background: var(--light-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    font-size: 0.88rem;
    align-self: flex-start;
}

/* 头像 + 站点名 */
.profile-section {
    text-align: center;
    margin-bottom: 1.2rem;
    padding-bottom: 1.2rem;
    border-bottom: 1px solid var(--border-color);
}

.profile-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--primary-color);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    margin-bottom: 0.8rem;
    transition: transform 0.3s;
}

.profile-avatar:hover {
    transform: scale(1.08);
}

.profile-name {
    font-family: 'STKaiti', 'Ma Shan Zheng', 'ZCOOL XiaoWei', serif;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 2px;
    background: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.3rem;
}

.profile-desc {
    font-size: 0.82rem;
    color: var(--secondary-color);
}

/* 右侧导航链接 */
.sidebar-nav {
    margin-bottom: 1.2rem;
    padding-bottom: 1.2rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-nav a {
    display: block;
    padding: 0.4rem 0.6rem;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.92rem;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    font-weight: 600;
}

/* 推荐文章 */
.recommend-section {
    margin-bottom: 1rem;
}

.recommend-title {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 0.8rem;
    color: var(--primary-color);
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--border-color);
}

.recommend-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.recommend-list li {
    margin-bottom: 0.6rem;
}

.recommend-list a {
    display: block;
    padding: 0.4rem 0.5rem;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.2s;
    font-size: 0.85rem;
    line-height: 1.4;
}

.recommend-list a:hover {
    background: rgba(37, 99, 235, 0.06);
    color: var(--primary-color);
}

.recommend-date {
    display: block;
    font-size: 0.75rem;
    color: var(--secondary-color);
    margin-top: 0.15rem;
}

/* ═════════════════════════════════════
   Hero 区域（仅首页）
   ═════════════════════════════════════ */
.hero {
    padding: 5rem 3rem;
    background: url('../posts/images/test/hello.png') center/cover no-repeat;
    color: white;
    border-radius: 16px;
    position: relative;
    overflow: hidden;
    min-height: 500px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
}


.hero h1,
.hero p {
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.4rem;
    font-weight: 800;
}

.hero p {
    font-size: 1.2rem;
}

/* ═════════════════════════════════════
   文章列表（首页）
   ═════════════════════════════════════ */
.posts-section {
    margin-bottom: 2rem;
}

.posts-section h2 {
    margin-bottom: 1.2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.post-item {
    background: var(--light-bg);
    border-radius: 10px;
    padding: 1.3rem 1.5rem;
    margin-bottom: 1.2rem;
    transition: transform 0.3s, box-shadow 0.3s;
    border-left: 4px solid var(--primary-color);
}

.post-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.post-item h3 {
    margin-bottom: 0.4rem;
}

.post-item h3 a {
    text-decoration: none;
    color: var(--text-color);
}

.post-item h3 a:hover {
    color: var(--primary-color);
}

.post-meta {
    color: var(--secondary-color);
    font-size: 0.85rem;
    margin-bottom: 0.6rem;
}

.post-excerpt {
    color: var(--text-color);
    margin-bottom: 0.6rem;
    font-size: 0.92rem;
}

.read-more {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
}

/* ═════════════════════════════════════
   文章页面内容
   ═════════════════════════════════════ */
.post-container {
    background: var(--bg-color);
    border-radius: 10px;
    padding: 0;
}

.post-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.post-header h1 {
    font-size: 2rem;
    margin-bottom: 0.8rem;
    color: var(--text-color);
    line-height: 1.3;
}

.post-content {
    line-height: 1.8;
}

.post-content h1,
.post-content h2,
.post-content h3 {
    margin: 2rem 0 1rem;
    color: var(--text-color);
}

.post-content h2 {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    scroll-margin-top: 2rem;
}

.post-content p {
    margin-bottom: 1.2rem;
}

/* 代码块 */
.post-content pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 1.2rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
    line-height: 1.5;
    font-size: 0.85rem;
}

.post-content code {
    font-family: 'Fira Code', Consolas, Monaco, monospace;
    font-size: 0.9rem;
}

.post-content pre .hljs,
.post-content pre code.hljs {
    background: transparent;
    color: inherit;
    padding: 0;
}

/* 行内代码 */
.post-content p code,
.post-content li code {
    background: #eef1f4;
    padding: 0.15em 0.4em;
    border-radius: 3px;
    font-size: 0.88em;
    color: #c7254e;
}

.post-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding: 0.8rem 1rem;
    margin: 1.5rem 0;
    color: var(--secondary-color);
    background: var(--light-bg);
    border-radius: 0 8px 8px 0;
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5rem 0;
}

.post-content ul,
.post-content ol {
    margin-left: 1.5rem;
    margin-bottom: 1.2rem;
}

.post-content li {
    margin-bottom: 0.4rem;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.9rem;
}

.post-content th,
.post-content td {
    border: 1px solid var(--border-color);
    padding: 0.6rem 0.8rem;
    text-align: left;
}

.post-content th {
    background: var(--light-bg);
    font-weight: 600;
}

.post-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

/* 文章导航（上一篇/下一篇） */
.post-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 0.8rem;
}

.post-navigation a {
    color: var(--primary-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    transition: all 0.3s;
    font-size: 0.9rem;
}

.post-navigation a:hover {
    background: var(--primary-color);
    color: white;
}

/* ═════════════════════════════════════
   关于 / 联系（首页）
   ═════════════════════════════════════ */
.about-section,
.contact-section {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
}

.about-section h2,
.contact-section h2 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.contact-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.contact-links a {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: opacity 0.3s;
    font-size: 0.9rem;
}

.contact-links a:hover {
    opacity: 0.9;
}

/* ═════════════════════════════════════
   友链页面
   ═════════════════════════════════════ */
.links-section {
    margin: 2rem 0;
}

.links-section h2 {
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.links-desc {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
}

.link-card {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 1rem;
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-color);
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.link-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.12);
    border-color: var(--primary-color);
}

.link-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary-color);
    flex-shrink: 0;
}

.link-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.link-name {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 0.15rem;
}

.link-desc {
    font-size: 0.8rem;
    color: var(--secondary-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ═════════════════════════════════════
   页脚
   ═════════════════════════════════════ */
footer {
    background: var(--text-color);
    color: white;
    padding: 1.5rem 0;
    margin-top: 3rem;
    text-align: center;
    font-size: 0.88rem;
}

footer a {
    color: white;
    text-decoration: none;
}

/* ═════════════════════════════════════
   标签
   ═════════════════════════════════════ */
.tag {
    display: inline-block;
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    padding: 0.15rem 0.6rem;
    border-radius: 3px;
    font-size: 0.82rem;
    margin-right: 0.3rem;
}

/* ═════════════════════════════════════
   响应式设计
   ═════════════════════════════════════ */
@media (max-width: 1200px) {
    .main-layout {
        gap: 1.2rem;
        padding: 1.5rem 1rem;
    }

    :root {
        --sidebar-width: 220px;
    }

    .content-area {
        width: 680px;
    }
}

@media (max-width: 960px) {
    .main-layout {
        flex-direction: column;
    }

    .toc-sidebar {
        width: 100%;
        position: static;
        max-height: 200px;
        order: -1; /* TOC 在最上方 */
    }

    .content-area {
        order: 0;
        max-width: 100%;
    }

    .right-sidebar {
        width: 100%;
        position: static;
        max-height: none;
        order: 1; /* 右侧栏在内容下方 */
    }
}

@media (max-width: 600px) {
    .hero {
        padding: 3rem 1.5rem;
        min-height: 160px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .post-header h1 {
        font-size: 1.5rem;
    }

    .post-navigation {
        flex-direction: column;
    }

    .right-sidebar {
        padding: 1rem;
    }

    .profile-avatar {
        width: 60px;
        height: 60px;
    }
}