/* ============================================================
   青蛙编程网 v2 · 全站样式
   明暗双主题：CSS 变量 + prefers-color-scheme（零 JS）
   代码高亮块固定亮底（Pygments friendly 配色），暗色下也可读
   ============================================================ */
:root {
  --c-bg: #ffffff;
  --c-bg-soft: #f6f8fa;
  --c-text: #24292f;
  --c-text-2: #57606a;
  --c-brand: #10b981;
  --c-brand-dark: #059669;
  --c-border: #d0d7de;
  --c-accent: #0969da;
  --topbar-h: 56px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --c-bg: #0d1117;
    --c-bg-soft: #161b22;
    --c-text: #e6edf3;
    --c-text-2: #8b949e;
    --c-border: #30363d;
    --c-accent: #58a6ff;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font: 16px/1.75 -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
}
a { color: var(--c-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; gap: 20px;
  height: var(--topbar-h); padding: 0 20px;
  background: var(--c-bg); border-bottom: 1px solid var(--c-border);
}
.brand { font-size: 18px; font-weight: 700; color: var(--c-text); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.cats { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; flex: 1 1 auto; }
.cats::-webkit-scrollbar { display: none; }
.cat {
  padding: 4px 10px; border-radius: 8px; font-size: 14px;
  color: var(--c-text-2); white-space: nowrap;
}
a.cat:hover { background: var(--c-bg-soft); color: var(--c-text); text-decoration: none; }
.cat-todo { opacity: 0.45; cursor: not-allowed; }

/* ---------- 布局 ---------- */
.layout { display: flex; max-width: 1280px; margin: 0 auto; padding: 0 16px; }
.layout.no-side .sidebar { display: none; }
.layout.no-side .main { max-width: 860px; margin: 0 auto; }
.sidebar {
  width: 240px; flex: none;
  position: sticky; top: var(--topbar-h);
  align-self: flex-start; max-height: calc(100vh - var(--topbar-h));
  overflow-y: auto; padding: 24px 16px 40px 0;
}
.side-title {
  margin: 0 0 8px; font-size: 13px; font-weight: 700; color: var(--c-text-2);
}
.side-item {
  display: block; padding: 5px 10px; margin: 1px 0; border-radius: 8px;
  font-size: 14px; color: var(--c-text-2); line-height: 1.5;
}
.side-item:hover { background: var(--c-bg-soft); color: var(--c-text); text-decoration: none; }
.side-n { float: right; font-size: 11px; opacity: 0.55; }
.side-item.active { background: var(--c-bg-soft); color: var(--c-brand-dark); font-weight: 600; }
.side-todo { opacity: 0.5; cursor: not-allowed; }
.side-todo:hover { background: transparent; color: var(--c-text-2); }
.main { flex: 1; min-width: 0; padding: 24px 4px 60px 28px; }
.crumb { font-size: 13px; color: var(--c-text-2); margin-bottom: 12px; }
.crumb span { opacity: 0.75; }

/* ---------- 正文排版 ---------- */
.doc h1 { font-size: 30px; line-height: 1.3; margin: 8px 0 20px; }
.doc h2 {
  font-size: 22px; margin: 36px 0 14px; padding-bottom: 8px;
  border-bottom: 1px solid var(--c-border);
}
.doc h3 { font-size: 18px; margin: 28px 0 10px; }
.doc p { margin: 12px 0; }
.doc ul, .doc ol { padding-left: 26px; }
.doc li { margin: 5px 0; }
.doc li input[type="checkbox"] { margin-right: 6px; vertical-align: -1px; }
.doc li:has(> input[type="checkbox"]) { list-style: none; margin-left: -1.2em; }
.doc blockquote {
  margin: 14px 0; padding: 6px 16px;
  border-left: 4px solid var(--c-brand);
  background: var(--c-bg-soft); border-radius: 0 8px 8px 0; color: var(--c-text-2);
}
.doc blockquote p { margin: 6px 0; }
.doc code {
  font-family: Consolas, "Courier New", monospace; font-size: 0.875em;
  background: var(--c-bg-soft); padding: 2px 6px; border-radius: 5px;
}
.doc table { border-collapse: collapse; margin: 14px 0; width: 100%; font-size: 14.5px; }
.doc th, .doc td { border: 1px solid var(--c-border); padding: 7px 12px; text-align: left; }
.doc th { background: var(--c-bg-soft); font-weight: 600; }
.doc tr:nth-child(2n) td { background: color-mix(in srgb, var(--c-bg-soft) 45%, transparent); }
.doc img { max-width: 100%; }

/* 代码块：构建期 Pygments 高亮，固定亮底保证暗色下可读 */
pre.hl {
  background: #f6f8fa; color: #1f2328;
  border: 1px solid #d0d7de; border-radius: 10px;
  padding: 14px 16px; overflow-x: auto; line-height: 1.6;
  font-size: 13.5px; margin: 14px 0;
}
pre.hl code {
  background: none; padding: 0; font-size: inherit;
  font-family: Consolas, "Courier New", monospace;
}
.doc hr { border: none; border-top: 1px solid var(--c-border); margin: 30px 0; }

/* ---------- ::: tip 提示容器 ---------- */
.callout {
  margin: 16px 0; padding: 10px 16px;
  border-left: 4px solid var(--c-brand); border-radius: 0 8px 8px 0;
  background: color-mix(in srgb, var(--c-brand) 8%, var(--c-bg));
}
.callout-warning { border-left-color: #d29922; background: color-mix(in srgb, #d29922 10%, var(--c-bg)); }
.callout-danger  { border-left-color: #f85149; background: color-mix(in srgb, #f85149 10%, var(--c-bg)); }
.callout-info    { border-left-color: var(--c-accent); background: color-mix(in srgb, var(--c-accent) 8%, var(--c-bg)); }
.callout p { margin: 6px 0; }
.callout-title { font-weight: 700; font-size: 14px; margin: 4px 0 2px !important; }

/* ---------- RunBox 在线运行（对齐原 RunBox.vue 视觉） ---------- */
.runbox {
  border: 1px solid var(--c-border); border-radius: 10px;
  overflow: hidden; margin: 16px 0;
}
.runbox-bar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 14px; background: var(--c-bg-soft);
  border-bottom: 1px solid var(--c-border);
}
.preview-bar { border-top: 1px solid var(--c-border); }
.runbox-title { font-size: 13px; font-weight: 600; opacity: 0.8; }
.runbox .btn {
  border: 1px solid var(--c-border); background: var(--c-bg); color: var(--c-text);
  border-radius: 6px; padding: 3px 12px; margin-left: 8px; cursor: pointer; font-size: 13px;
}
.runbox .btn.run { background: #2dd4a7; border-color: #2dd4a7; color: #06342a; font-weight: 700; }
.runbox .btn.run:hover { filter: brightness(1.08); }
.runbox textarea {
  display: block; width: 100%; border: none; outline: none; resize: vertical;
  padding: 12px 14px; font-family: Consolas, "Courier New", monospace;
  font-size: 13px; line-height: 1.6; color: var(--c-text); background: var(--c-bg);
}
.runbox iframe { display: block; width: 100%; border: none; background: #fff; }
.runbox-tip {
  font-size: 12px; opacity: 0.6; padding: 6px 14px; margin: 0;
  border-top: 1px dashed var(--c-border);
}

/* ---------- 前端在线运行场（/frontend/playground.html）：左编辑、右结果 ---------- */
.pg-cols { display: flex; align-items: stretch; }
.pg-pane { flex: 1 1 0; min-width: 0; display: flex; flex-direction: column; }
.pg-pane + .pg-pane { border-left: 1px solid var(--c-border); }
.pg-pane textarea { flex: 1; min-height: 640px; resize: vertical; }
.pg-pane iframe { display: block; width: 100%; flex: 1; min-height: 640px; background: #fff; }
@media (max-width: 760px) { .pg-cols { flex-direction: column; } .pg-pane + .pg-pane { border-left: 0; border-top: 1px solid var(--c-border); } }
/* 无侧栏 + 全幅无留白（只 playground 使用） */
.layout.no-side.pg-wide { max-width: none; padding: 0; }
.layout.no-side.pg-wide .main { max-width: none; padding: 0; }

/* ---------- 未迁移链接 ---------- */
.link-todo {
  color: var(--c-text-2); opacity: 0.6;
  border-bottom: 1px dashed var(--c-border); cursor: help;
}

/* ---------- 上一篇/下一篇 ---------- */
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 40px; }
.pager:empty { display: none; }
.pager a {
  padding: 10px 16px; border: 1px solid var(--c-border); border-radius: 10px;
  font-size: 14px; color: var(--c-text); flex: 1;
}
.pager a:hover { border-color: var(--c-brand); text-decoration: none; }
.pager .pager-next { text-align: right; }

/* ---------- 首页 ---------- */
.home { max-width: 1280px; margin: 0 auto; padding: 20px 20px 60px; }
/* 顶部盒面板：网站简介 + 推荐文章 + 热门阅读 同一盒子（虚线分栏）；
   类别与技术栈卡片区在其下整行，面板整体天然位于卡片区上方（doc/architecture.md「首页顶部面板」） */
.home-panel {
  border: 1px solid var(--c-border); border-radius: 12px; background: var(--c-bg);
  padding: 14px 22px;
  display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
}
.home-panel > * + * { border-left: 1px dashed var(--c-border); padding-left: 24px; }
.home-col { display: flex; flex-direction: column; min-height: 0; }
.col-title { margin: 0 0 4px; font-size: 15px; }
.hero h1 { font-size: 26px; margin: 0 0 6px; }
.hero p { font-size: 15px; color: var(--c-text-2); margin: 4px 0; }
.hero-tip {
  font-size: 13px; padding: 5px 12px; border-radius: 8px;
  background: var(--c-bg-soft); display: inline-block;
}
.cards { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 24px; }  /* 首页类别：一行一个 */
.card { border: 1px solid var(--c-border); border-radius: 12px; padding: 16px 18px; }
.card h3 { margin: 0 0 10px; font-size: 16px; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {  /* 首页技术栈小盒：第一行名称，第二行简介；定宽定高保证所有盒子整齐划一 */
  font-size: 15px; padding: 8px 14px; border-radius: 10px;
  border: 1px solid var(--c-border); color: var(--c-text); background: var(--c-bg);
  display: inline-block; width: 180px; height: 84px; overflow: hidden;
}
a.chip { border-color: var(--c-brand); color: var(--c-brand-dark); font-weight: 600; }
a.chip:hover { background: var(--c-bg-soft); text-decoration: none; }
.chip-desc {  /* 最多两行，超出省略，配合 .chip 定高 */
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden;
  margin: 3px 0 0; opacity: 0.65; font-weight: 400; font-size: 13px; line-height: 1.45;
}

/* 前端教程代码块上方的在线运行条（main.js 自动注入，见「前端教程代码块」节） */
.code-actions { display: flex; justify-content: flex-end; margin: 0 0 6px; }
.code-actions .btn.gorun {
  font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 999px;
  border: 1px solid var(--c-brand); color: var(--c-brand-dark); background: var(--c-bg);
}
.code-actions .btn.gorun:hover { background: var(--c-bg-soft); text-decoration: none; }
.code-actions .btn.gorun.norun {
  border-color: var(--c-border); color: var(--c-text-2);
  cursor: not-allowed; filter: none; opacity: 0.55; font-weight: 400;
}
.chip-todo { opacity: 0.45; cursor: not-allowed; }

/* Python 教程代码块的「▶ 运行」（main.js：POST /api/run 服务器 Docker 沙箱执行，结果内嵌代码块下） */
.code-actions .btn.gorun.pyrun { border-color: var(--c-accent); color: var(--c-accent); }
.py-result { margin: 6px 0 12px; }
.py-title { font-size: 12px; font-weight: 600; color: var(--c-text-2); margin: 6px 0; }
.py-out {
  margin: 0 0 6px; padding: 10px 14px; border: 1px solid var(--c-border); border-radius: 8px;
  background: var(--c-bg-soft); font-size: 13px; line-height: 1.5;
  overflow-x: auto; white-space: pre; max-height: 20em;
}
.py-err {
  margin: 0; padding: 10px 14px; border: 1px solid #e3b341; border-radius: 8px;
  background: rgba(227, 179, 65, 0.08); color: var(--c-text); font-size: 13px; line-height: 1.5;
  overflow-x: auto; white-space: pre; max-height: 20em;
}
.py-note { font-size: 12px; color: var(--c-text-2); padding: 4px 0; }

/* ---------- Python 在线运行场（/python/playground.html）：左编辑、右终端输出 ---------- */
/* 终端固定深底（与前端场 iframe 内 console 捕获区同一配色），亮暗主题下都可读 */
.pg-pane .py-term {
  display: block; width: 100%; flex: 1; min-height: 640px; overflow: auto;
  background: #0d1117; color: #e6edf3;
  font-family: Consolas, "Courier New", monospace; font-size: 13px; line-height: 1.6;
  padding: 12px 14px; white-space: pre-wrap; word-break: break-word;
}
.py-term .t-ok { color: #4ade80; }              /* stdout 绿 */
.py-term .t-err { color: #f87171; }             /* stderr 红 */
.py-term .t-meta { color: #8b949e; }            /* 状态 / 提示灰 */
.pg-tip { font-size: 12px; color: var(--c-text-2); opacity: 0.75; margin: 6px 4px; }

/* 首页盒面板内的清单（推荐文章 / 实战项目） */
.rec-list { list-style: none; margin: 0; padding: 0; }
.col-title, .side-empty { flex: none; }
.rec-list li { padding: 5px 0; border-top: 1px dashed var(--c-border); font-size: 14px; }
.rec-list li:first-child { border-top: 0; }
.rec-link { display: block; font-weight: 600; line-height: 1.4; }
a.rec-link:hover { color: var(--c-brand-dark); text-decoration: none; }
.side-empty { font-size: 13px; color: var(--c-text-2); padding: 8px 0 0; }

/* ---------- 搜索 ---------- */
.search { position: relative; flex: none; }
.search input {
  width: 200px; height: 32px; padding: 0 12px; border-radius: 16px;
  border: 1px solid var(--c-border); background: var(--c-bg-soft);
  color: var(--c-text); font-size: 13px; outline: none;
}
.search input:focus { border-color: var(--c-brand); background: var(--c-bg); }
.search-panel {
  position: absolute; right: 0; top: 40px; width: 340px; max-height: 60vh;
  overflow-y: auto; padding: 6px; z-index: 200;
  background: var(--c-bg); border: 1px solid var(--c-border); border-radius: 12px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}
.search-hit { display: block; padding: 8px 10px; border-radius: 8px; }
.search-hit:hover { background: var(--c-bg-soft); text-decoration: none; }
.search-hit strong { display: block; font-size: 14px; color: var(--c-text); }
.search-hit span {
  display: block; margin-top: 2px; font-size: 12px; color: var(--c-text-2);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.search-empty { margin: 0; padding: 10px; font-size: 13px; color: var(--c-text-2); }

/* ---------- 章节代码下载 ---------- */
.download-box { margin-top: 36px; padding-top: 20px; border-top: 1px dashed var(--c-border); }
.download-btn {
  display: inline-block; padding: 8px 18px; border-radius: 10px;
  background: var(--c-brand); color: #06342a; font-size: 14px; font-weight: 600;
}
.download-btn:hover { text-decoration: none; filter: brightness(0.95); }
.download-tip { margin: 8px 0 0; font-size: 12px; color: var(--c-text-2); }

/* ---------- 页脚 / 回到顶部 ---------- */
.footer {
  border-top: 1px solid var(--c-border); padding: 20px;
  text-align: center; font-size: 13px; color: var(--c-text-2);
}
.footer-beian { margin: 6px 0 0; font-size: 12px; }
.footer-beian a { color: var(--c-text-2); }
.footer-beian a:hover { color: var(--c-brand-dark); }
#back-top {
  position: fixed; right: 24px; bottom: 28px; width: 44px; height: 44px;
  border-radius: 50%; border: 1px solid var(--c-border);
  background: var(--c-bg); color: var(--c-text);
  font-size: 20px; cursor: pointer; opacity: 0; pointer-events: none;
  transition: opacity 0.25s;
}
#back-top.show { opacity: 0.9; pointer-events: auto; }
#back-top:hover { border-color: var(--c-brand); color: var(--c-brand-dark); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  #back-top { transition: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .sidebar { display: none; }
  .main { padding-left: 0; }
  .doc h1 { font-size: 25px; }
  .search input { width: 118px; }
  .search-panel { width: min(340px, calc(100vw - 32px)); }
  /* 首页盒面板：<900px 窄屏单列堆叠，虚线分隔改为横向 */
  .home-panel { grid-template-columns: 1fr; gap: 0; }
  .home-panel > * + * {
    border-left: 0; padding-left: 0;
    border-top: 1px dashed var(--c-border); padding-top: 18px; margin-top: 18px;
  }
}
@media (max-width: 560px) {
  .cards { grid-template-columns: 1fr; }  /* 手机：单列 */
}