/* blog.css — material 风格 + CSS 变量主题
 * <html data-theme="material|github|dark">，?theme= 参数 + localStorage 切换
 */

:root,
[data-theme="material"] {
  --bg: #ffffff;
  --fg: #212121;
  --muted: #757575;
  --link: #0288d1;
  --border: #e0e0e0;
  --code-bg: #f5f5f5;
  --admon-bg: #e1f5fe;
  --admon-border: #0288d1;
  --topbar-bg: #0288d1;
  --topbar-fg: #ffffff;
  --topbar-border: #0277bd;
  --tabs-bg: #0288d1;
  --tabs-fg: rgba(255, 255, 255, 0.85);
  --tabs-active: #ffffff;
  --quote-fg: #616161;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.14), 0 1px 2px 0 rgba(0, 0, 0, 0.12);
  --sidebar-bg: #fafafa;
}

[data-theme="github"] {
  --bg: #ffffff;
  --fg: #24292f;
  --muted: #6e7781;
  --link: #0969da;
  --border: #d0d7de;
  --code-bg: #f6f8fa;
  --admon-bg: #f6f8fa;
  --admon-border: #0969da;
  --topbar-bg: #24292f;
  --topbar-fg: #ffffff;
  --topbar-border: #1b1f24;
  --tabs-bg: #24292f;
  --tabs-fg: rgba(255, 255, 255, 0.8);
  --tabs-active: #ffffff;
  --quote-fg: #57606a;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  --sidebar-bg: #f6f8fa;
}

[data-theme="dark"] {
  --bg: #0d1117;
  --fg: #e6edf3;
  --muted: #8b949e;
  --link: #58a6ff;
  --border: #30363d;
  --code-bg: #161b22;
  --admon-bg: #161b22;
  --admon-border: #58a6ff;
  --topbar-bg: #010409;
  --topbar-fg: #e6edf3;
  --topbar-border: #30363d;
  --tabs-bg: #010409;
  --tabs-fg: #8b949e;
  --tabs-active: #e6edf3;
  --quote-fg: #8b949e;
  --card-bg: #161b22;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  --sidebar-bg: #010409;
  /* 深色主题下 admonition 背景压暗，保证文字可读 */
  --admon-info-bg: #0d2b3d;
  --admon-info-bd: #29b6f6;
  --admon-tip-bg: #12331a;
  --admon-tip-bd: #66bb6a;
  --admon-warn-bg: #3d2f0d;
  --admon-warn-bd: #ffca28;
  --admon-quote-bg: #2c1540;
  --admon-quote-bd: #ab47bc;

  --code-window-bg: #1c2128;
  --code-window-bar: #242a33;}

/* ---- 骨架 ---- */
* { box-sizing: border-box; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Roboto", sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
}

/* 顶栏 */
.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 1.25rem;
  background: var(--topbar-bg);
  color: var(--topbar-fg);
}
.brand { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; color: inherit; text-decoration: none; margin-right: auto; white-space: nowrap; }
.brand .logo { height: 28px; width: 28px; border-radius: 50%; object-fit: cover; }
.search-box { position: relative; }
.search-box input {
  border: 1px solid rgba(128, 128, 128, 0.4);
  border-radius: 4px;
  padding: 0.25rem 0.6rem;
  font-size: 0.85rem;
  background: rgba(255, 255, 255, 0.15);
  color: inherit;
  width: 180px;
}
.search-box input::placeholder { color: inherit; opacity: 0.7; }
.search-result {
  position: absolute;
  top: 110%;
  right: 0;
  min-width: 260px;
  max-height: 320px;
  overflow: auto;
  background: var(--card-bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: var(--card-shadow);
  z-index: 50;
  padding: 0.25rem;
}
.search-result a { display: block; padding: 0.35rem 0.6rem; border-radius: 4px; font-size: 0.88rem; }
.search-result a:hover { background: var(--code-bg); }
.search-result .none { display: block; padding: 0.5rem; color: var(--muted); font-size: 0.85rem; }
.theme-switch { display: flex; gap: 0.25rem; }
.theme-switch a {
  font-size: 0.75rem;
  padding: 0.12rem 0.55rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  color: inherit;
  text-decoration: none;
  opacity: 0.7;
  white-space: nowrap;
}
.theme-switch a.active { opacity: 1; background: rgba(127, 127, 127, 0.25); }

/* tabs 导航 */
.tabs {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  padding: 0 1.25rem;
  background: var(--tabs-bg);
}
.tabs a {
  color: var(--tabs-fg);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 0.55rem 0.9rem;
}
.tabs a:hover { color: var(--tabs-active); }
.tabs a.active { color: var(--tabs-active); font-weight: 600; }

/* 页脚 */
.foot {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  color: var(--muted);
  font-size: 0.85em;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}
.foot-follow-links a { color: var(--link); text-decoration: none; }
.foot-follow-links a:hover { text-decoration: underline; }
.foot-logo img { width: 40px; height: 40px; border-radius: 8px; display: block; }

/* ---- 首页卡片（瀑布流，原站 card-columns 还原） ---- */
.cards-wrap { max-width: 1200px; margin: 0 auto; padding: 1.5rem 1.25rem; }
.cards-wrap h1 { font-size: 1.4rem; margin: 0 0 0.25rem; }
.cards-wrap .sub { color: var(--muted); margin: 0 0 1.25rem; }
.card-columns { column-gap: 1.25rem; }
@media (min-width: 768px) { .card-columns { column-count: 2; } }
@media (min-width: 1200px) { .card-columns { column-count: 3; } }
.card {
  break-inside: avoid;
  margin-bottom: 1.25rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}
.card a.card-link { color: inherit; text-decoration: none; display: block; }
.card img.card-img { width: 100%; height: auto; display: block; aspect-ratio: 16/9; object-fit: cover; background: var(--code-bg); }
.card .card-body { padding: 0.9rem 1rem 1rem; }
.card .card-title { margin: 0 0 0.5rem; font-size: 1.02rem; line-height: 1.5; }
.card .card-text { margin: 0 0 0.6rem; font-size: 0.86rem; color: var(--muted); line-height: 1.65; }
.card .card-meta { display: flex; gap: 1rem; align-items: center; font-size: 0.78rem; color: var(--muted); }
.card .card-meta .views { margin-left: auto; white-space: nowrap; }

/* ---- 文章页三栏 ---- */
.doc-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 220px;
  gap: 1.5rem;
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem;
  align-items: start;
}
.doc-nav {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 0.9rem;
  font-size: 0.85rem;
}
.doc-nav .nav-group { font-weight: 700; margin: 0.6rem 0 0.3rem; }
.doc-nav .nav-group:first-child { margin-top: 0; }
.doc-nav ul { list-style: none; margin: 0; padding-left: 0.8rem; }
.doc-nav li { margin: 0.15rem 0; }
.doc-nav .nav-dir { color: var(--fg); }
.doc-nav details.nav-tree { margin: 0.2rem 0; }
.doc-nav details.nav-tree > summary { cursor: pointer; list-style: none; padding: 0.1rem 0; display: flex; align-items: center; gap: 0.4rem; }
.doc-nav details.nav-tree > summary::-webkit-details-marker { display: none; }
.doc-nav details.nav-tree > summary .nav-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
/* 右对齐折叠按钮：> 收起态，˅ 展开态 */
.doc-nav .nav-toggle { margin-left: auto; flex: none; width: 1.2em; text-align: right; color: var(--muted); font-size: 0.8em; }
.doc-nav .nav-toggle::before { content: '>'; }
.doc-nav details.nav-tree[open] > summary .nav-toggle::before { content: '˅'; }
/* L2 子目录缩进 */
.doc-nav details.nav-sub { margin-left: 0.2rem; }
.doc-nav a { display: block; padding: 0.1rem 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--fg); }
.doc-nav a:hover { color: var(--link); }
.doc-nav a.current { font-weight: 700; color: var(--link); }
/* 左栏滚动条收窄（默认约 15px → 6px） */
.doc-nav { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
.doc-nav::-webkit-scrollbar { width: 6px; }
.doc-nav::-webkit-scrollbar-track { background: transparent; }
.doc-nav::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.doc-nav::-webkit-scrollbar-thumb:hover { background: var(--muted); }
/* 左栏词云：密排 inline + 轻微旋转错位 + 允许轻微重叠 */
.tag-cloud-side { margin-top: 1rem; border-top: 1px solid var(--border); padding-top: 0.5rem; }
.tag-cloud { line-height: 1.9; }
.tag-cloud a.tag { text-decoration: none; display: inline-block; margin: 0 0.1em; vertical-align: baseline; }
.tag-cloud a.tag:hover .tag-name { text-decoration: underline; }
.tag-cloud .tag-name { white-space: nowrap; display: inline-block; }
.tag-cloud-center { text-align: center; margin-bottom: 1.5rem; line-height: 2.1; }
/* JS 未加载时的兜底字号（线性公式近似：中值），JS 就绪后按 data-size 精确设置 */
.tag-cloud .tag-name { font-size: 0.9rem; }
.doc-main { min-width: 0; }
.doc-main .cover-img { width: 100%; border-radius: 8px; margin-bottom: 1rem; }
.doc-main .meta { color: var(--muted); font-size: 0.88rem; display: flex; gap: 1rem; flex-wrap: wrap; }
.doc-toc {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  font-size: 0.82rem;
  border-left: 2px solid var(--border);
  padding-left: 0.9rem;
}
.doc-toc .toc-title { font-weight: 700; margin-bottom: 0.4rem; }
.doc-toc ul { list-style: none; margin: 0; padding: 0; }
.doc-toc li { margin: 0.2rem 0; }
.doc-toc li.lv3 { padding-left: 1rem; }
.doc-toc a { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-toc a:hover { text-decoration: underline; }

/* 正文 */
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
.admonition {
  border-left: 4px solid var(--admon-border);
  background: var(--admon-bg);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  border-radius: 4px;
}
.admonition-title { font-weight: 600; margin: 0.2rem 0; }
details.admonition summary { cursor: pointer; }
/* 按类型分色：蓝 info / 绿 tip / 黄 warning / 紫 quote，变量随主题切换 */
.admonition-info, .admonition-note, .admonition-notes, .admonition-abstract {
  border-left-color: var(--admon-info-bd, #0288d1);
  background: var(--admon-info-bg, #e1f5fe);
}
.admonition-tip, .admonition-tips, .admonition-hint {
  border-left-color: var(--admon-tip-bd, #2e7d32);
  background: var(--admon-tip-bg, #e8f5e9);
}
.admonition-warning, .admonition-attention, .admonition-question,
.admonition-important, .admonition-notice, .admonition-faq {
  border-left-color: var(--admon-warn-bd, #f9a825);
  background: var(--admon-warn-bg, #fff8e1);
}
.admonition-quote, .admonition-cite {
  border-left-color: var(--admon-quote-bd, #6a1b9a);
  background: var(--admon-quote-bg, #f3e5f5);
}
/* 代码块：苹果风（SF Mono + 圆角 + 顶部圆点条），高亮由 highlight.js 构建期生成 */
.md-body code, .md-body tt {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}
.md-body :not(pre) > code {
  background: var(--code-bg); padding: 0.15em 0.45em; border-radius: 6px;
  font-size: 0.88em; border: 1px solid var(--border);
}
.md-body pre {
  position: relative; background: var(--code-window-bg, #f5f5f7);
  border: 1px solid var(--border); border-radius: 12px;
  padding: 2.6rem 1.1rem 1.1rem; overflow: auto;
  font-size: 0.86rem; line-height: 1.65; margin: 1.4em 0;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
.md-body pre::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2.1rem;
  border-bottom: 1px solid var(--border); border-radius: 12px 12px 0 0;
  background:
    radial-gradient(circle 6px at 22px 50%, #ff5f57 5.5px, transparent 6px),
    radial-gradient(circle 6px at 42px 50%, #febc2e 5.5px, transparent 6px),
    radial-gradient(circle 6px at 62px 50%, #28c840 5.5px, transparent 6px),
    var(--code-window-bar, #ececee);
}
.md-body pre code { background: none; padding: 0; border: none;
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  display: grid; grid-template-columns: auto 1fr; gap: 0 1.1rem; }
.md-body pre code.hljs { background: none; }
/* 行号列：不参与水平滚动（跟随内容滚动），颜色淡化 */
.md-body pre .ln { display: flex; flex-direction: column; text-align: right;
  color: var(--muted); opacity: 0.5; user-select: none; min-width: 2ch; }
.md-body pre .cl-body { display: block; white-space: pre; }

/* highlight.js one-light 配色（浅色主题） */
.hljs-comment, .hljs-quote { color: #a0a1a7; font-style: italic; }
.hljs-doctag, .hljs-keyword, .hljs-formula { color: #a626a4; }
.hljs-section, .hljs-name, .hljs-selector-tag, .hljs-deletion, .hljs-subst { color: #e45649; }
.hljs-literal { color: #0184bb; }
.hljs-string, .hljs-regexp, .hljs-addition, .hljs-attribute, .hljs-meta .hljs-string { color: #50a14f; }
.hljs-attr, .hljs-variable, .hljs-template-variable, .hljs-type, .hljs-selector-class,
.hljs-selector-attr, .hljs-selector-pseudo, .hljs-number { color: #986801; }
.hljs-symbol, .hljs-bullet, .hljs-link, .hljs-meta, .hljs-selector-id, .hljs-title { color: #4078f2; }
.hljs-built_in, .hljs-title.class_, .hljs-class .hljs-title { color: #c18401; }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: bold; }
.md-body img { max-width: 100%; }
/* 文章内嵌公众号 CTA */
.article-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 2rem 0 0.5rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--code-bg);
}
.article-cta img { width: 96px; height: 96px; border-radius: 8px; flex: none; }
.article-cta strong { font-size: 1.05rem; }
.article-cta p { margin: 0.3rem 0 0; color: var(--muted); font-size: 0.92rem; }
.md-body table { border-collapse: collapse; display: block; overflow-x: auto; }
.md-body td, .md-body th { border: 1px solid var(--border); padding: 0.4rem 0.7rem; }
.md-body blockquote { border-left: 4px solid var(--border); margin: 1rem 0; padding: 0 1rem; color: var(--quote-fg); }
.md-body h1 .h-anchor, .md-body h2 .h-anchor, .md-body h3 .h-anchor { display: none; }

/* 相关阅读（模板层渲染，不写正文） */
.related { margin-top: 2.5rem; border-top: 1px solid var(--border); padding-top: 1rem; }
.related h2 { font-size: 1.1rem; margin: 0 0 0.6rem; }
.related ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }
.related li a { font-weight: 600; }
.related li p { margin: 0.15rem 0 0; font-size: 0.86rem; color: var(--muted); }

/* 窄屏：sidebar 收起 */
@media (max-width: 1024px) {
  .doc-layout { grid-template-columns: minmax(0, 1fr); }
  .doc-nav, .doc-toc { position: static; max-height: none; }
  .doc-toc { border-left: none; border-top: 2px solid var(--border); padding: 0.75rem 0 0; }
}
@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; }
  .search-box input { width: 130px; }
  .theme-switch { display: none; }
}

/* 主题徽标（文章头所属主题，可点击；用 margin 保证间距，不依赖 flex gap） */
.topic-badges { display: inline; }
.topic-badge { display: inline-block; padding: 1px 10px; margin: 2px 10px 2px 0; border-radius: 999px; font-size: 12px;
  color: inherit; border: 1px solid currentColor; opacity: .75; text-decoration: none; white-space: nowrap; }
.topic-badge:hover { opacity: 1; }

/* 系列导航 + 转化位 */
.series-nav { margin: 1.6em 0 .6em; }
.series-links { display: flex; justify-content: space-between; gap: 12px; }
.series-links a { font-size: 14px; }
.article-convert { margin: 1em 0 1.8em; padding: 12px 16px; border: 1px solid currentColor;
  border-radius: 10px; opacity: .9; }
.article-convert a { text-decoration: none; }

/* 难度徽标 + 阅读路径 */
.level-badge { display: inline-block; padding: 1px 10px; margin: 2px 0 2px 6px; border-radius: 999px;
  font-size: 12px; border: 1px dashed currentColor; opacity: .8; white-space: nowrap; }
.level-badge[data-lv="入门"] { color: #1a7f37; }
.level-badge[data-lv="进阶"] { color: #9a6700; }
.level-badge[data-lv="实战"] { color: #b42318; }
.reading-path { margin: 1.6em 0 .6em; font-size: 14px; display: flex; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; }
.reading-path-links { display: inline-flex; gap: 12px; }

/* 专题页（/topics/） */
.hub-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; margin-top: 14px; }
.hub-card { border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; text-decoration: none; color: inherit; }
.hub-card:hover { border-color: currentColor; }
.hub-card-name { font-weight: 600; font-size: 15px; display: flex; justify-content: space-between; align-items: baseline; }
.hub-card-count { font-size: 12px; color: var(--text-light); font-weight: 400; }
.hub-card-desc { font-size: 12.5px; color: var(--text-secondary); margin-top: 6px; line-height: 1.7; }
.hub-list { list-style: none; padding: 0; margin: 0; }
.hub-list li { display: flex; justify-content: space-between; gap: 12px; padding: 6px 0; border-bottom: 1px dashed var(--border); }
.hub-date { color: var(--text-light); font-size: 12px; white-space: nowrap; }

/* dark 下的 one-dark 高亮覆盖 */
[data-theme="dark"] .hljs-comment, [data-theme="dark"] .hljs-quote { color: #7d8590; font-style: italic; }
[data-theme="dark"] .hljs-doctag, [data-theme="dark"] .hljs-keyword, [data-theme="dark"] .hljs-formula { color: #ff7b72; }
[data-theme="dark"] .hljs-section, [data-theme="dark"] .hljs-name, [data-theme="dark"] .hljs-selector-tag,
[data-theme="dark"] .hljs-deletion, [data-theme="dark"] .hljs-subst { color: #ffa198; }
[data-theme="dark"] .hljs-literal { color: #79c0ff; }
[data-theme="dark"] .hljs-string, [data-theme="dark"] .hljs-regexp, [data-theme="dark"] .hljs-addition,
[data-theme="dark"] .hljs-attribute, [data-theme="dark"] .hljs-meta .hljs-string { color: #a5d6ff; }
[data-theme="dark"] .hljs-attr, [data-theme="dark"] .hljs-variable, [data-theme="dark"] .hljs-template-variable,
[data-theme="dark"] .hljs-type, [data-theme="dark"] .hljs-selector-class,
[data-theme="dark"] .hljs-selector-attr, [data-theme="dark"] .hljs-selector-pseudo, [data-theme="dark"] .hljs-number { color: #ffa657; }
[data-theme="dark"] .hljs-symbol, [data-theme="dark"] .hljs-bullet, [data-theme="dark"] .hljs-link,
[data-theme="dark"] .hljs-meta, [data-theme="dark"] .hljs-selector-id, [data-theme="dark"] .hljs-title { color: #d2a8ff; }
[data-theme="dark"] .hljs-built_in, [data-theme="dark"] .hljs-title.class_, [data-theme="dark"] .hljs-class .hljs-title { color: #ffa657; }

/* 专题索引：段落式（标题=链接、介绍=纯文本、段间距大） */
.topics-list .topic-section { margin: 1.9em 0; padding-bottom: 1.7em; border-bottom: 1px solid var(--border); }
.topics-list .topic-section:last-child { border-bottom: none; }
.topics-list .topic-title { font-size: 1.15rem; margin: 0 0 0.55em; display: flex; align-items: baseline; gap: 0.7em; }
.topics-list .topic-title a { text-decoration: none; color: var(--link); }
.topics-list .topic-title a:hover { text-decoration: underline; }
.topics-list .topic-count { font-size: 0.8rem; font-weight: 400; color: var(--muted); white-space: nowrap; }
.topics-list .topic-intro { margin: 0; line-height: 1.85; color: var(--fg); }