:root {
  --bg: #f7f8f5;
  --surface: #ffffff;
  --surface-soft: #edf2ed;
  --sidebar: #e7ece6;
  --text: #252a2d;
  --muted: #65706f;
  --line: #d5ddd6;
  --code: #eef3f1;
  --blue: #246a8f;
  --green: #52745d;
  --gold: #9a672c;
  --red: #a34b40;
  --shadow: 0 14px 34px rgba(27, 41, 39, .1);
}

html[data-theme="dark"] {
  --bg: #171b1d;
  --surface: #202629;
  --surface-soft: #222d2c;
  --sidebar: #14191b;
  --text: #e3e7e2;
  --muted: #a0aaa7;
  --line: #344044;
  --code: #111719;
  --blue: #86bed8;
  --green: #91b99b;
  --gold: #d5a05e;
  --red: #d07a70;
  --shadow: 0 14px 34px rgba(0, 0, 0, .34);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.86;
  margin: 0;
}
a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
button, input, select, textarea { font: inherit; }
button, select, input { min-height: 38px; }
button { cursor: pointer; }
code {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 5px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: .88em;
  padding: 1px 5px;
}
pre {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 8px;
  line-height: 1.58;
  margin: 18px 0;
  overflow-x: auto;
  padding: 16px;
}
pre code { background: transparent; border: 0; padding: 0; }

#sidebar {
  background: var(--sidebar);
  border-right: 1px solid var(--line);
  bottom: 0;
  display: flex;
  flex-direction: column;
  left: 0;
  overflow-y: auto;
  padding: 20px 14px;
  position: fixed;
  top: 0;
  width: 318px;
  z-index: 10;
}
.site-head { border-bottom: 1px solid var(--line); margin-bottom: 10px; padding: 2px 8px 16px; }
.site-title { color: var(--green); display: block; font-size: 20px; font-weight: 780; line-height: 1.35; text-decoration: none; }
.site-subtitle { color: var(--muted); font-size: 13px; margin-top: 4px; }
.nav-home { border-bottom: 1px solid var(--line); display: grid; gap: 3px; padding: 0 0 10px; }
.nav-home a { border-radius: 6px; color: var(--text); font-size: 14px; padding: 6px 8px; text-decoration: none; }
.nav-home a:hover { background: var(--surface-soft); }
.nav-stage { border-bottom: 1px solid var(--line); padding: 7px 0; }
.nav-stage summary {
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
  font-weight: 760;
  line-height: 1.45;
  list-style-position: inside;
  padding: 4px 8px;
}
.nav-stage ul { display: grid; gap: 2px; list-style: none; margin: 4px 0 0; padding: 0; }
.nav-stage a {
  border-radius: 6px;
  color: var(--text);
  display: block;
  font-size: 13px;
  line-height: 1.45;
  padding: 5px 8px 5px 22px;
  text-decoration: none;
}
.nav-stage a:hover { background: var(--surface-soft); }
.nav-stage a.current { background: var(--surface-soft); color: var(--green); font-weight: 760; }
.sidebar-foot { border-top: 1px solid var(--line); display: grid; gap: 8px; margin-top: auto; padding: 14px 8px 0; }
.sidebar-foot button { background: transparent; border: 1px solid var(--line); border-radius: 6px; color: var(--text); justify-self: start; padding: 4px 10px; }
.sidebar-foot a { color: var(--muted); font-size: 12px; }
#sidebar-toggle { display: none; }

#content { margin-left: 318px; min-width: 0; padding: 42px 48px 80px; }
.reading-progress { background: var(--line); height: 3px; left: 318px; position: fixed; right: 0; top: 0; z-index: 8; }
.reading-progress span { background: var(--green); display: block; height: 100%; }
article { margin: 0 auto; max-width: 900px; min-width: 0; }
.chapter-meta { color: var(--gold); display: flex; font-size: 12px; font-weight: 760; justify-content: space-between; letter-spacing: .04em; margin-bottom: 20px; }
h1 { font-size: 38px; letter-spacing: 0; line-height: 1.25; margin: 0 0 18px; }
h2 { border-left: 4px solid var(--green); font-size: 26px; letter-spacing: 0; line-height: 1.4; margin: 52px 0 16px; padding-left: 13px; }
h3 { color: var(--green); font-size: 19px; letter-spacing: 0; line-height: 1.5; margin: 30px 0 10px; }
p { margin: 12px 0; }
article > p:first-of-type { color: var(--muted); font-size: 19px; line-height: 1.8; }
article ul, article ol { padding-left: 25px; }
article li { margin: 6px 0; }
blockquote {
  background: var(--surface);
  border-left: 4px solid var(--gold);
  color: var(--muted);
  margin: 20px 0;
  padding: 12px 18px;
}
blockquote p { margin: 0; }
table { border-collapse: collapse; display: block; font-size: 15px; margin: 20px 0; overflow-x: auto; width: 100%; }
th, td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; vertical-align: top; }
th { background: var(--surface-soft); }
hr { border: 0; border-top: 1px solid var(--line); margin: 44px 0; }
.admonition { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--blue); margin: 20px 0; padding: 12px 18px; }
.admonition-title { color: var(--blue); font-weight: 760; margin: 0 0 4px; }
.admonition.warning { border-left-color: var(--gold); }
.admonition.warning .admonition-title { color: var(--gold); }
.admonition.danger { border-left-color: var(--red); }
.admonition.danger .admonition-title { color: var(--red); }
.page-toc { background: var(--surface); border: 1px solid var(--line); border-radius: 7px; margin: 0 0 28px; padding: 10px 14px; }
.page-toc summary { color: var(--green); cursor: pointer; font-weight: 760; }
.page-toc ul { margin-bottom: 4px; }
.page-toc a { font-size: 14px; }
.chapter-complete { border-bottom: 1px solid var(--line); border-top: 1px solid var(--line); margin-top: 56px; padding: 18px 4px; }
.chapter-complete label { align-items: center; cursor: pointer; display: flex; gap: 10px; }
.chapter-complete input { accent-color: var(--green); height: 19px; min-height: 0; width: 19px; }
.chapter-complete input:checked + span { color: var(--green); font-weight: 720; }
.pager { display: grid; gap: 16px; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 40px auto 0; max-width: 900px; }
.pager-slot { background: var(--surface); border: 1px solid var(--line); border-radius: 7px; color: var(--text); min-height: 92px; padding: 13px 16px; text-decoration: none; }
.pager-slot span { color: var(--muted); display: block; font-size: 12px; }
.pager-slot strong { display: block; font-size: 14px; margin-top: 5px; }
.pager-slot.next { text-align: right; }
.pager-slot:hover { border-color: var(--green); }
.pager-slot:empty { background: transparent; border: 0; }

.course-hero { border-bottom: 1px solid var(--line); padding: 12px 0 30px; }
.course-hero.compact { padding-bottom: 22px; }
.eyebrow { color: var(--gold) !important; font-size: 13px !important; font-weight: 800; letter-spacing: .06em; }
.course-hero > p:last-of-type { color: var(--muted); font-size: 19px; max-width: 780px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.hero-actions a { background: var(--green); border: 1px solid var(--green); border-radius: 6px; color: var(--surface); font-size: 14px; font-weight: 720; padding: 7px 13px; text-decoration: none; }
.hero-actions a + a { background: transparent; color: var(--green); }
.course-contract { border-bottom: 1px solid var(--line); display: grid; gap: 18px; grid-template-columns: repeat(3, minmax(0, 1fr)); padding: 24px 0; }
.course-contract strong, .course-contract span { display: block; }
.course-contract span { color: var(--muted); font-size: 14px; line-height: 1.6; margin-top: 5px; }
.overview-stage { margin-top: 48px; }
.overview-stage-head { align-items: baseline; display: flex; gap: 14px; }
.overview-stage-head > span { color: var(--gold); font-size: 12px; font-weight: 760; }
.overview-stage-head h2 { border: 0; margin: 0; padding: 0; }
.overview-chapters { border-top: 1px solid var(--line); margin-top: 14px; }
.overview-chapters a { align-items: center; border-bottom: 1px solid var(--line); color: var(--text); display: grid; gap: 14px; grid-template-columns: 42px minmax(0, 1fr); padding: 11px 4px; text-decoration: none; }
.overview-chapters a:hover { background: var(--surface-soft); }
.overview-chapters span { color: var(--gold); font-size: 12px; font-weight: 800; }
.overview-chapters strong { font-size: 16px; }
.lab-index { border-top: 1px solid var(--line); margin-top: 26px; }
.lab-index-row { align-items: center; border-bottom: 1px solid var(--line); display: grid; gap: 14px; grid-template-columns: 42px minmax(0, 1fr) auto; padding: 14px 4px; }
.lab-index-row > span { color: var(--gold); font-size: 12px; font-weight: 800; }
.lab-index-row p { color: var(--muted); font-size: 13px; margin: 3px 0 0; }
.lab-index-row > a { font-size: 14px; }

.logic-map { align-items: center; display: grid; gap: 8px; grid-template-columns: repeat(9, minmax(0, 1fr)); margin: 22px 0; }
.logic-map > div { background: var(--surface); border-top: 3px solid var(--green); min-height: 108px; padding: 11px; }
.logic-map strong, .logic-map span { display: block; }
.logic-map span { color: var(--muted); font-size: 12px; line-height: 1.45; margin-top: 5px; }
.logic-map b { color: var(--muted); text-align: center; }
.failure-case { border-bottom: 1px solid var(--line); border-top: 1px solid var(--line); margin: 22px 0; padding: 14px 4px; }
.failure-case strong { color: var(--red); }

.lab-shell { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; margin: 24px 0; padding: 18px; }
.lab-toolbar { align-items: end; border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 10px; padding-bottom: 16px; }
.lab-toolbar label { color: var(--muted); display: grid; font-size: 12px; font-weight: 720; gap: 4px; }
.lab-toolbar button, .lab-toolbar select, .lab-toolbar input { background: var(--bg); border: 1px solid var(--line); border-radius: 5px; color: var(--text); padding: 6px 10px; }
.lab-toolbar button:hover { border-color: var(--green); }
.lab-toolbar button.primary { background: var(--green); border-color: var(--green); color: var(--surface); }
.lab-output { margin-top: 16px; min-height: 170px; }
.lab-status { color: var(--green); font-size: 13px; min-height: 24px; margin: 10px 0 0; }
.lab-grid { display: grid; gap: 14px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.lab-pane { border-top: 3px solid var(--blue); min-width: 0; padding: 12px 4px; }
.lab-pane h3 { margin-top: 0; }
.lab-pane pre { max-height: 360px; }
.lab-kv { border-top: 1px solid var(--line); }
.lab-kv > div { border-bottom: 1px solid var(--line); display: grid; gap: 12px; grid-template-columns: 120px minmax(0, 1fr); padding: 8px 2px; }
.lab-kv strong { color: var(--green); }
.lab-kv span { white-space: pre-wrap; }

.loop-stage-list { display: grid; gap: 8px; grid-template-columns: repeat(5, minmax(0, 1fr)); }
.loop-stage { background: var(--bg); border: 1px solid var(--line); min-height: 116px; padding: 10px; }
.loop-stage.current { background: var(--surface-soft); border-color: var(--green); box-shadow: inset 0 -3px 0 var(--green); }
.loop-stage span { color: var(--gold); display: block; font-size: 11px; font-weight: 800; }
.loop-stage strong { display: block; font-size: 14px; margin-top: 6px; }
.loop-stage p { color: var(--muted); font-size: 12px; line-height: 1.45; margin: 5px 0 0; }
.history-stack { display: grid; gap: 6px; }
.history-item { border-left: 3px solid var(--line); padding: 7px 10px; }
.history-item.user { border-left-color: var(--blue); }
.history-item.assistant { border-left-color: var(--green); }
.history-item.tool { border-left-color: var(--gold); }
.history-item strong { display: block; font-size: 12px; }
.history-item span { color: var(--muted); font-size: 13px; }

.state-timeline { border-left: 2px solid var(--line); margin: 10px 0 0 8px; padding-left: 18px; }
.state-event { margin: 12px 0; position: relative; }
.state-event::before { background: var(--surface); border: 3px solid var(--green); border-radius: 50%; content: ""; height: 10px; left: -24px; position: absolute; top: 8px; width: 10px; }
.state-event.failed::before { border-color: var(--red); }
.state-event strong, .state-event span { display: block; }
.state-event span { color: var(--muted); font-size: 13px; }

.budget-bar { background: var(--line); display: flex; height: 34px; margin: 16px 0; overflow: hidden; }
.budget-segment { align-items: center; color: #fff; display: flex; font-size: 11px; justify-content: center; min-width: 0; overflow: hidden; transition: width .2s; white-space: nowrap; }
.budget-system { background: var(--green); }
.budget-history { background: var(--blue); }
.budget-files { background: var(--gold); }
.budget-tools { background: var(--red); }
.budget-free { background: #7b8582; }
.budget-warning { color: var(--red); font-weight: 720; }

.permission-result { border-left: 5px solid var(--line); padding: 12px 16px; }
.permission-result.allow { border-color: var(--green); }
.permission-result.ask { border-color: var(--gold); }
.permission-result.deny { border-color: var(--red); }
.permission-result strong { display: block; font-size: 22px; }
.permission-layers { display: grid; gap: 10px; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 14px; }
.permission-layers > div { border-top: 3px solid var(--line); padding: 10px 4px; }
.permission-layers > div.pass { border-color: var(--green); }
.permission-layers > div.stop { border-color: var(--red); }
.permission-layers span { color: var(--muted); display: block; font-size: 12px; }

.task-pool, .agent-lanes { display: grid; gap: 8px; }
.task-pool label { align-items: start; border-bottom: 1px solid var(--line); cursor: pointer; display: grid; gap: 8px; grid-template-columns: auto minmax(0, 1fr); padding: 8px 2px; }
.task-pool input { accent-color: var(--green); min-height: 0; }
.agent-lane { align-items: start; border-left: 4px solid var(--blue); display: grid; gap: 12px; grid-template-columns: 120px minmax(0, 1fr); padding: 9px 12px; }
.agent-lane.main { border-left-color: var(--green); }
.agent-lane.review { border-left-color: var(--gold); }
.agent-lane span { color: var(--muted); }

.mechanism-result { border-top: 4px solid var(--green); padding: 14px 4px; }
.mechanism-result strong { display: block; font-size: 25px; }
.mechanism-score { display: grid; gap: 8px; margin-top: 14px; }
.mechanism-score-row { align-items: center; display: grid; gap: 10px; grid-template-columns: 100px minmax(0, 1fr) 42px; }
.mechanism-track, .eval-track { background: var(--line); height: 12px; }
.mechanism-fill, .eval-fill { background: var(--blue); display: block; height: 100%; transition: width .2s; }

.eval-comparison { display: grid; gap: 18px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.eval-version { border-top: 4px solid var(--blue); padding: 12px 4px; }
.eval-version.candidate { border-top-color: var(--green); }
.eval-row { align-items: center; display: grid; gap: 8px; grid-template-columns: 100px minmax(0, 1fr) 48px; margin: 9px 0; }
.release-decision { border-top: 1px solid var(--line); font-size: 18px; font-weight: 760; margin-top: 18px; padding-top: 14px; }
.release-decision.pass { color: var(--green); }
.release-decision.hold { color: var(--red); }

@media (max-width: 1120px) {
  #content { padding-left: 28px; padding-right: 28px; }
  .logic-map { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .logic-map b { display: none; }
}

@media (max-width: 900px) {
  body { font-size: 16px; }
  #sidebar { box-shadow: var(--shadow); transform: translateX(-105%); transition: transform .2s; width: 306px; z-index: 20; }
  #sidebar.open { transform: translateX(0); }
  #sidebar-toggle { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; color: var(--text); display: block; font-size: 18px; left: 14px; min-height: 0; padding: 4px 10px; position: fixed; top: 12px; z-index: 30; }
  #content { margin-left: 0; padding: 64px 20px 58px; }
  .reading-progress { left: 0; }
  article, section, h2, h3 { scroll-margin-top: 58px; }
  h1 { font-size: 30px; }
  h2 { font-size: 23px; }
  .chapter-meta { padding-left: 46px; }
  .course-contract, .lab-grid, .pager, .permission-layers, .eval-comparison { grid-template-columns: 1fr; }
  .overview-stage-head { align-items: start; flex-direction: column; gap: 2px; }
  .lab-index-row { grid-template-columns: 34px minmax(0, 1fr); }
  .lab-index-row > a { grid-column: 2; }
  .logic-map, .loop-stage-list { grid-template-columns: 1fr; }
  .logic-map > div, .loop-stage { min-height: auto; }
  .lab-toolbar { align-items: stretch; flex-direction: column; }
  .lab-toolbar label, .lab-toolbar button, .lab-toolbar select, .lab-toolbar input { width: 100%; }
  .lab-toolbar label { min-width: 0; overflow-x: clip; }
  .lab-toolbar input[type="range"] { margin-left: 2px; margin-right: 2px; width: calc(100% - 4px); }
  .lab-kv > div, .agent-lane { grid-template-columns: 1fr; gap: 2px; }
  .permission-layers, .mechanism-score-row, .eval-row { min-width: 0; }
  .pager-slot { min-height: auto; }
}