/* ============================================
   文章页 / 系列页样式 · article.css
   正文排版 + 代码高亮明暗双主题
   ============================================ */

/* ---------- 页面布局 ---------- */
.article-page, .series-page { background: var(--bg); }

.article-layout {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: calc(var(--header-h) + 40px) 24px 60px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 220px; /* 正文 + 右侧TOC */
    gap: 48px;
    align-items: start;
}

/* ---------- 面包屑 ---------- */
.article-breadcrumb {
    font-size: 0.85rem; color: var(--text-mute);
    margin-bottom: 28px; font-family: 'JetBrains Mono', monospace;
}
.article-breadcrumb a { color: var(--text-soft); transition: var(--transition); }
.article-breadcrumb a:hover { color: var(--accent); }
.crumb-sep { margin: 0 6px; opacity: 0.5; }

/* ---------- 文章主体 ---------- */
.article-body {
    min-width: 0; /* 防止内容撑破网格 */
    max-width: 760px;
}

.article-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700; line-height: 1.25; letter-spacing: -0.5px;
    margin-bottom: 16px;
}

.article-meta {
    display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
    margin-bottom: 32px; padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
    font-size: 0.88rem; color: var(--text-mute);
    font-family: 'JetBrains Mono', monospace;
}
.read-time, .word-count { display: inline-flex; align-items: center; gap: 4px; }

.diff-badge {
    padding: 4px 12px; border-radius: 50px; font-weight: 600;
    font-size: 0.82rem;
}
.diff-badge.basic { background: rgba(34, 197, 94, 0.12); color: #16a34a; }
.diff-badge.intermediate { background: rgba(234, 179, 8, 0.14); color: #ca8a04; }
.diff-badge.advanced { background: rgba(239, 68, 68, 0.12); color: #dc2626; }
[data-theme="dark"] .diff-badge.basic { color: #4ade80; }
[data-theme="dark"] .diff-badge.intermediate { color: #facc15; }
[data-theme="dark"] .diff-badge.advanced { color: #f87171; }

/* ============================================
   正文排版 .prose（核心）
   ============================================ */
.prose { color: var(--text); font-size: 1.02rem; line-height: 1.85; }

.prose > *:first-child { margin-top: 0; }

.prose h2 {
    font-size: 1.5rem; font-weight: 700; margin: 2.4em 0 0.8em;
    padding-bottom: 0.3em; border-bottom: 1px solid var(--border);
    scroll-margin-top: 90px; letter-spacing: -0.3px;
}
.prose h3 {
    font-size: 1.2rem; font-weight: 600; margin: 1.8em 0 0.6em;
    scroll-margin-top: 90px;
}
.prose h4 { font-size: 1.05rem; font-weight: 600; margin: 1.5em 0 0.5em; }

.prose p { margin: 0 0 1.1em; }

.prose a {
    color: var(--accent); text-decoration: underline;
    text-decoration-color: rgba(99, 102, 241, 0.3);
    text-underline-offset: 3px; transition: var(--transition);
}
.prose a:hover { text-decoration-color: var(--accent); }

/* 引用块（pi 笔记大量使用） */
.prose blockquote {
    margin: 1.4em 0; padding: 12px 18px;
    border-left: 4px solid var(--accent);
    background: var(--bg-alt); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-soft);
}
.prose blockquote p { margin: 0.4em 0; }
.prose blockquote > *:first-child { margin-top: 0; }
.prose blockquote > *:last-child { margin-bottom: 0; }

/* 列表 */
.prose ul, .prose ol { margin: 0 0 1.1em; padding-left: 1.6em; }
.prose li { margin: 0.35em 0; }
.prose ul li::marker { color: var(--accent); }
.prose ol li::marker { color: var(--accent); font-weight: 600; }

/* 行内代码 */
.prose code:not(pre code) {
    font-family: 'JetBrains Mono', monospace; font-size: 0.88em;
    background: var(--bg-alt); padding: 2px 7px; border-radius: 5px;
    border: 1px solid var(--border); color: var(--accent-2);
    word-break: break-word;
}

/* 代码块 */
.prose pre {
    margin: 1.4em 0; padding: 18px 20px; border-radius: var(--radius-sm);
    background: #1e1e2e; border: 1px solid var(--border);
    overflow-x: auto; line-height: 1.6; font-size: 0.9rem;
    position: relative;
}
[data-theme="dark"] .prose pre { background: #15151f; }
.prose pre code {
    font-family: 'JetBrains Mono', monospace;
    background: none; border: none; padding: 0; color: #cdd6f4;
    font-size: inherit;
}

/* 表格 */
.prose table {
    width: 100%; border-collapse: collapse; margin: 1.4em 0;
    font-size: 0.92rem; display: block; overflow-x: auto;
}
.prose th, .prose td {
    padding: 10px 14px; border: 1px solid var(--border); text-align: left;
}
.prose th { background: var(--bg-alt); font-weight: 600; }
.prose tr:nth-child(even) td { background: var(--bg-alt); }
[data-theme="dark"] .prose tr:nth-child(even) td { background: rgba(255,255,255,0.02); }

/* 分隔线 */
.prose hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }

/* 图片 */
.prose img { border-radius: var(--radius-sm); margin: 1.4em auto; }

/* 强调 */
.prose strong { font-weight: 700; color: var(--text); }

/* ============================================
   上下篇导航
   ============================================ */
.article-nav {
    display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
    margin-top: 48px; padding-top: 28px; border-top: 1px solid var(--border);
}
.nav-post {
    display: flex; flex-direction: column; gap: 6px;
    padding: 16px 18px; border: 1px solid var(--border);
    border-radius: var(--radius-sm); transition: var(--transition);
}
.nav-post.next { text-align: right; }
.nav-post:hover { border-color: var(--accent); background: var(--bg-alt); transform: translateY(-2px); }
.nav-post.placeholder { border: none; pointer-events: none; }
.nav-post-dir { font-size: 0.8rem; color: var(--text-mute); font-family: 'JetBrains Mono', monospace; }
.nav-post-title { font-weight: 600; color: var(--text); font-size: 0.95rem; }
.nav-post:hover .nav-post-title { color: var(--accent); }

/* ============================================
   右侧 TOC 目录
   ============================================ */
.article-toc {
    position: sticky; top: calc(var(--header-h) + 24px);
    max-height: calc(100vh - var(--header-h) - 48px);
    overflow-y: auto;
    font-size: 0.85rem;
}
.article-toc h4 {
    font-size: 0.78rem; color: var(--text-mute); text-transform: uppercase;
    letter-spacing: 1px; margin-bottom: 12px; font-weight: 600;
}
.article-toc ul { list-style: none; padding: 0; margin: 0; }
.article-toc li { margin: 0; }
.article-toc a {
    display: block; padding: 5px 0 5px 12px; color: var(--text-mute);
    border-left: 2px solid transparent; transition: var(--transition);
    line-height: 1.4;
}
.article-toc a:hover { color: var(--accent); }
.article-toc a.active { color: var(--accent); border-left-color: var(--accent); font-weight: 500; }

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
    .article-layout { grid-template-columns: 1fr; }
    .article-toc {
        position: static; max-height: none; margin-top: 32px;
        padding: 20px; background: var(--bg-alt); border-radius: var(--radius-sm);
        border: 1px solid var(--border);
    }
    .article-toc ul { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 20px; }
}
@media (max-width: 680px) {
    .article-layout { padding-left: 18px; padding-right: 18px; }
    .article-nav { grid-template-columns: 1fr; }
    .nav-post.next { text-align: left; }
    .article-toc ul { grid-template-columns: 1fr; }
}

/* ============================================
   highlight.js 明暗主题（GitHub 风格）
   ============================================ */
.hljs { color: #cdd6f4; background: transparent; }
.hljs-comment, .hljs-quote { color: #6c7086; font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-built_in { color: #cba6f7; }
.hljs-string, .hljs-attr, .hljs-template-tag, .hljs-addition { color: #a6e3a1; }
.hljs-number, .hljs-literal, .hljs-bullet { color: #fab387; }
.hljs-title, .hljs-section, .hljs-name { color: #89b4fa; }
.hljs-variable, .hljs-template-variable { color: #f38ba8; }
.hljs-type, .hljs-class .hljs-title { color: #f9e2af; }
.hljs-tag { color: #94e2d5; }
.hljs-deletion { color: #f38ba8; }
.hljs-meta { color: #6c7086; }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: bold; }