/* llm-atlas 设计 token + 组件 · 暗色 */
:root {
  --bg: #17171a;
  --surface: #2c2c2a;
  --surface-2: #232322;
  --border: #444441;
  --text: #f1efe8;
  --text-2: #d3d1c7;
  --muted: #888780;
  --faint: #5f5e5a;
  --accent: #1d9e75;
  --accent-light: #9fe1cb;
  --accent-dark: #085041;
  --mono: "SF Mono", Menlo, Consolas, monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang SC", "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.7;
}
a { color: var(--accent-light); text-decoration: none; }
a:hover { text-decoration: none; }
html { scroll-behavior: smooth; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 28px; border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.topbar .brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 15px; color: var(--text);
}
.topbar .brand:hover { text-decoration: none; }
.logo {
  width: 26px; height: 26px; border-radius: 6px;
  background: var(--accent); color: var(--accent-dark);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700;
}

.container { max-width: 1100px; margin: 0 auto; padding: 28px; }
.breadcrumb { font-size: 12px; color: var(--muted); margin-bottom: 10px; }
.breadcrumb b { color: var(--accent-light); font-weight: 500; }
h1 { font-size: 20px; font-weight: 600; margin-bottom: 16px; }
h2 { font-size: 16px; font-weight: 600; margin: 24px 0 8px; }
p { margin-bottom: 12px; color: var(--text-2); }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; margin: 12px 0; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 16px; color: var(--text); display: block;
}
.card:hover { border-color: var(--accent); text-decoration: none; }
.card h3 { font-size: 14px; font-weight: 600; margin: 0; }
.card .head { font-size: 11px; color: var(--accent-light); letter-spacing: .05em; margin-bottom: 6px; }
ul.items { list-style: none; margin: 4px 0 0; }
ul.items li { display: flex; justify-content: space-between; align-items: center; padding: 3px 0; font-size: 13px; }
ul.items li .todo { color: var(--faint); font-size: 11px; }

.layout { display: flex; gap: 24px; }
.sidebar {
  width: 210px; flex-shrink: 0;
  border-right: 1px solid var(--border);
  padding: 20px 14px 40px 0;
  font-size: 12.5px;
  position: sticky; top: 0; align-self: flex-start;
  max-height: 100vh; overflow-y: auto;
}
.sidebar .group { color: var(--faint); font-size: 11px; margin: 14px 0 4px; }
.sidebar .group a { display: inline; padding: 0; color: var(--faint); font-size: 11px; }
.sidebar .group a:hover { color: var(--accent-light); }
.sidebar a { display: block; padding: 4px 10px; border-radius: 6px; color: var(--text-2); }
.sidebar a.active { background: var(--accent-dark); color: var(--accent-light); }
.sidebar a:hover { text-decoration: none; color: var(--accent-light); }
.sidebar .missing { display: block; padding: 4px 10px; color: var(--faint); cursor: default; }

/* ---- wiki 侧栏 TOC ---- */
.sidebar .home-link {
  display: inline-block; margin: 18px 0 2px; padding: 3px 10px;
  font-size: 12.5px; color: var(--muted);
}
.sidebar .home-link:hover { color: var(--accent-light); }
.sidebar .toc-chapter {
  display: block; margin: 16px 0 4px; padding: 0;
  font-size: 11.5px; color: var(--faint); letter-spacing: .04em;
}
.sidebar a.toc-chapter:hover { color: var(--accent-light); }
.sidebar .toc-chapter.current {
  color: var(--accent-light); font-size: 12.5px; font-weight: 600;
  padding-left: 10px; border-left: 2px solid var(--accent);
}
.sidebar .toc-chapter.dim { opacity: .55; }
.sidebar .toc-item {
  display: flex; gap: 9px; align-items: baseline;
  padding: 4px 10px; border-radius: 6px; color: var(--text-2);
}
.sidebar .toc-item .n {
  font-family: var(--mono); font-size: 10.5px; color: var(--faint); min-width: 14px;
}
.sidebar .toc-item:hover { color: var(--accent-light); }
.sidebar .toc-item.active { background: var(--accent-dark); color: var(--accent-light); }
.sidebar .toc-item.active .n { color: var(--accent-light); }
.sidebar .missing::after { content: "未创建"; font-size: 10px; margin-left: 6px; color: var(--faint); opacity: .7; }
.content { flex: 1; min-width: 0; max-width: 860px; padding: 20px 0 60px; }

/* ---- 首页 wiki 总览 ---- */
.ov-chapter { margin: 30px 0; }
.ov-chapter h2 { font-size: 17px; font-weight: 600; margin: 0 0 6px; }
.ov-chapter h2.dim { color: var(--faint); }
.ov-chapter h2 .note { font-size: 12px; color: var(--muted); font-weight: 400; margin-left: 10px; }
.ov-list { margin: 6px 0 0 26px; }
.ov-list li { padding: 3.5px 0; font-size: 13.5px; }
.ov-list li a { color: var(--text-2); }
.ov-list li a:hover { color: var(--accent-light); }
.ov-list li a::marker, .ov-list li::marker { color: var(--faint); }
.ov-list li.dim { color: var(--faint); font-size: 12.5px; }

/* ---- 章节页：章内小节导航 + 分节 ---- */
.chapter-nav {
  display: flex; flex-wrap: wrap; gap: 8px;
  padding: 10px 0 4px; margin-bottom: 8px;
  position: sticky; top: 0; z-index: 5;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.chapter-nav a {
  font-size: 12px; padding: 3px 11px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 999px; color: var(--text-2);
}
.chapter-nav a:hover { border-color: var(--accent); color: var(--accent-light); }
.chapter-sec {
  padding-top: 6px; margin-top: 34px;
  border-top: 1px solid var(--border);
  scroll-margin-top: 64px;
}
.chapter-sec:first-of-type { border-top: none; margin-top: 12px; }
h2.sec-title {
  font-size: 18px; font-weight: 600;
  color: var(--accent-light); margin: 0 0 12px;
}

.figure {
  background: var(--surface); border: 1px dashed var(--border);
  border-radius: 10px; padding: 18px; margin: 16px 0;
  text-align: center; color: var(--faint); font-size: 12px;
}
.fig {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 14px 6px; margin: 16px 0;
}
.fig svg { display: block; width: 100%; height: auto; }
.fig .cap { text-align: center; font-size: 11.5px; color: var(--muted); padding: 8px 0 6px; }
.selfcheck {
  background: var(--surface); border-left: 3px solid var(--accent);
  border-radius: 8px; padding: 12px 16px; margin: 16px 0;
}
.selfcheck .label { font-size: 11px; color: var(--accent-light); margin-bottom: 4px; }
.selfcheck li { color: var(--text-2); font-size: 13px; margin-left: 18px; }
code, pre { font-family: var(--mono); font-size: 12.5px; }
code { background: var(--surface); border-radius: 4px; padding: 1px 6px; }
pre {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 14px; overflow-x: auto; margin: 12px 0;
  line-height: 1.6;
}
pre code { background: none; padding: 0; }

/* ---- 代码高亮（highlight.js） ---- */
pre code.hljs {
  background: transparent; padding: 0; display: block;
  overflow-x: visible;
}
pre code.hljs .hljs-comment, pre code.hljs .hljs-quote { color: #7f8578; font-style: italic; }
pre code.hljs .hljs-keyword { color: #c792ea; }
pre code.hljs .hljs-string { color: #a5d6a7; }
pre code.hljs .hljs-number, pre code.hljs .hljs-literal { color: #f0a45d; }
pre code.hljs .hljs-title, pre code.hljs .hljs-function { color: #82aaff; }
pre code.hljs .hljs-built_in, pre code.hljs .hljs-type { color: #7dd3fc; }
pre code.hljs .hljs-params { color: #f1efe8; }
table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 13px; }
th, td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; color: var(--text-2); }
th { background: var(--surface-2); color: var(--text); font-weight: 600; }

/* KaTeX 展式公式超宽保护（桌面/手机都生效） */
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 2px 0; }

/* ================= 移动端适配 ================= */
@media (max-width: 800px) {
  body { font-size: 15px; }
  .container { padding: 14px 14px 40px; }
  .topbar { padding: 10px 14px; }

  /* 侧栏：取消 sticky（否则钉在屏幕顶、正文从它底下透出来），收起小节列表只留章级目录 */
  .layout { flex-direction: column; gap: 0; }
  .sidebar {
    position: static; width: 100%; max-height: none; overflow: visible;
    border-right: none; border-bottom: 1px solid var(--border);
    padding: 10px 0 14px; background: var(--surface-2);
  }
  .sidebar .toc-item { display: none; }           /* 小节级目录在手机上交给吸顶 chips */
  .sidebar a, .sidebar .toc-chapter { padding: 5px 10px; }
  .sidebar .group { margin: 10px 0 2px; }

  .content { padding: 14px 0 40px; max-width: 100%; }

  /* 吸顶 chips：改单行横向滑动，不再折行叠罗汉 */
  .chapter-nav {
    flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch;
    gap: 6px; padding: 8px 0; margin-bottom: 4px;
    scrollbar-width: none;
  }
  .chapter-nav::-webkit-scrollbar { display: none; }
  .chapter-nav a { flex: 0 0 auto; font-size: 12.5px; padding: 5px 12px; }
  .chapter-sec { scroll-margin-top: 56px; }

  h1 { font-size: 19px; }
  h2.sec-title { font-size: 17px; }
  .fig { padding: 10px 8px 4px; }
  .plain { padding: 10px 12px; }
  .selfcheck { padding: 10px 12px; }
  .preq { padding: 8px 10px; }

  /* 宽表格横向滑动，不撑破版面 */
  table {
    display: block; width: max-content; max-width: 100%;
    overflow-x: auto; -webkit-overflow-scrolling: touch;
  }
  th, td { padding: 6px 9px; font-size: 12.5px; }

  pre { padding: 10px 12px; font-size: 12px; }
  code, pre { font-size: 12px; }
}

/* 参考与延伸 */
.refs {
  margin-top: 28px; padding: 18px 20px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  font-size: 12.5px; color: var(--text-2);
}
.refs h2 { margin: 0 0 10px; font-size: 15px; color: var(--text); }
.refs h3 { margin: 12px 0 4px; font-size: 12px; color: var(--faint); text-transform: uppercase; letter-spacing: .04em; }
.refs ul { margin: 4px 0; padding-left: 18px; }
.refs li { margin: 3px 0; line-height: 1.55; }
.refs i { color: var(--text-2); }
.fig .fig-cap { text-align: center; font-size: 11.5px; color: var(--muted); padding: 8px 0 6px; }

/* ---- 前置数学链接 ---- */
.preq {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 9px 14px; margin: 12px 0 14px;
  font-size: 12.5px; color: var(--muted);
}
.preq b { color: var(--text-2); font-weight: 600; }
.preq a { color: var(--accent-light); }

/* ---- 白话注解（说人话） ---- */
.plain {
  background: #2a2721; border: 1px solid #4d4534; border-left: 3px solid #d9a441;
  border-radius: 8px; padding: 12px 16px; margin: 16px 0;
}
.plain .ptag {
  display: inline-block; font-size: 11px; font-weight: 600;
  color: #e8b74a; letter-spacing: .08em; margin-bottom: 5px;
}
.plain p { margin: 4px 0; font-size: 13.5px; color: var(--text-2); }
.plain p b { color: #f0d9a6; font-weight: 600; }
.plain ul { margin: 4px 0 4px 18px; }
.plain li { font-size: 13px; color: var(--text-2); margin: 2px 0; }

/* ---- 题库 · 三段式问答卡 ---- */
details.qa {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 2px 14px 10px; margin: 10px 0;
}
details.qa summary {
  cursor: pointer; user-select: none;
  font-weight: 600; font-size: 13.5px; color: var(--accent-light);
  padding: 10px 0 8px; line-height: 1.5;
}
details.qa summary:hover { color: var(--text); }
details.qa[open] summary {
  border-bottom: 1px dashed var(--border); margin-bottom: 10px;
}
.qa-part { margin: 10px 0; }
.qa-part p { font-size: 13px; color: var(--text-2); margin: 5px 0; line-height: 1.75; }
.qa-part ul, .qa-part ol { margin: 5px 0 5px 18px; }
.qa-part li { font-size: 13px; color: var(--text-2); margin: 4px 0; line-height: 1.7; }
.qa-part > b { font-size: 13px; }
.qa-q > b { color: var(--text); }
.qa-a > b { color: var(--accent-light); }
.qa-w > b { color: #e8c06b; }

/* ---- 题目卡片 · 一题一框 ---- */
.prob {
  background: transparent; border: 1px solid var(--border);
  border-radius: 10px; padding: 2px 16px 10px; margin: 18px 0;
}
.prob h3, .prob h4 { margin-top: 14px; }
.prob .qadesc { background: rgba(0,0,0,0.16); border-style: dashed; margin-top: 6px; }
.prob pre { margin-bottom: 8px; }

/* ---- 题面速览 · 直接展示 ---- */
.qadesc {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 14px; margin: 8px 0 12px;
}
.qadesc p { font-size: 13px; color: var(--text-2); margin: 4px 0; line-height: 1.75; }
.qadesc p b { color: var(--text-2); }
.qadesc .qd-t { font-weight: 600; color: var(--accent-light); margin-bottom: 6px; }

/* ---- 套路总纲 · 折叠题库 ---- */
details.lcprobs {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 2px 14px 10px; margin: 16px 0 26px;
}
details.lcprobs summary {
  cursor: pointer; user-select: none;
  font-weight: 600; font-size: 13.5px; color: var(--accent-light);
  padding: 10px 0 8px;
}
details.lcprobs summary:hover { color: var(--text); }
details.lcprobs[open] summary {
  border-bottom: 1px dashed var(--border); margin-bottom: 10px;
}
details.lcprobs h4 { margin: 18px 0 4px; }
details.lcprobs pre { margin: 10px 0; }


/* ===== leetcode 在线运行器 ===== */
.lcrun{margin:12px 0 26px;border:1px solid #2b3548;border-radius:10px;background:#101828;padding:10px 14px}
.lcrun-bar{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.lcrun button{background:#1b2740;color:#cfe3ff;border:1px solid #33456b;border-radius:7px;padding:5px 12px;font-size:12.5px;cursor:pointer}
.lcrun button:hover{background:#24334f}
.lcrun button:disabled{opacity:.5;cursor:default}
.lcrun-status{font-size:12px;color:#94a3b8}
.lcrun-out{margin:10px 0 2px;padding:10px 12px;background:#0b0f16;border:1px solid #26324a;border-radius:8px;font:12.5px/1.7 "SF Mono",Menlo,Consolas,monospace;color:#c7d2e0;white-space:pre-wrap;overflow-x:auto}
.lcrun-ta{width:100%;min-height:200px;margin-top:10px;padding:10px 12px;background:#0b0f16;color:#d8e2ef;border:1px solid #26324a;border-radius:8px;font:13px/1.6 "SF Mono",Menlo,Consolas,monospace;resize:vertical;tab-size:4}

/* ---------- 学科分组标题（总览 + 侧栏） ---------- */
.ov-group {
  margin: 30px 0 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--accent, #7ed49a);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 6px;
}
.ov-group:first-child { margin-top: 6px; }

.toc-group {
  margin: 16px 0 4px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  color: #6d7386;
}
.toc-group:first-of-type { margin-top: 10px; }