@import url("research-palette.css");

:root { color-scheme: light; }
* { box-sizing: border-box; }
html { scroll-padding-top: 32px; scrollbar-color: #a7afa0 var(--page); }
body { margin: 0; color: var(--ink); background: var(--page); font: 16px/1.95 var(--sans); -webkit-font-smoothing: antialiased; }
::selection { background: #dce5d3; color: var(--ink); }
a { color: var(--accent); text-decoration-color: #a5b29b; text-underline-offset: .22em; text-decoration-thickness: 1px; }
a:hover { color: var(--ink); text-decoration-color: currentColor; }
a, button, summary { touch-action: manipulation; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
button { font: inherit; cursor: pointer; }
[hidden] { display: none !important; }
img, video { display: block; max-width: 100%; height: auto; }
p, h1, h2, h3, figure { margin: 0; }
h1, h2, h3 { line-height: 1.55; text-wrap: pretty; overflow-wrap: anywhere; }
main > section > h1, .toctree-wrapper, .headerlink { display: none; }
.skip-link { position: fixed; top: -100px; left: 20px; padding: 12px 20px; z-index: 100; background: var(--ink); color: var(--page); }
.skip-link:focus { top: 12px; }
.header-inner { max-width: 1440px; margin: auto; display: flex; align-items: center; justify-content: space-between; padding: 24px 40px; }
.brand { color: var(--ink); text-decoration: none; font: 600 25px/1.4 var(--serif); white-space: nowrap; }
.brand span { color: inherit; }
.site-header nav { position: fixed; z-index: 10; top: 160px; left: max(40px, calc((100vw - 1440px) / 2 + 40px)); width: 190px; display: flex; flex-direction: column; gap: 12px; border-left: 1px solid var(--rule); padding-left: 18px; }
.site-header nav a, .header-links a { color: var(--muted); text-decoration: none; font-size: 14px; padding: 4px 0; }
.site-header nav a:first-child { color: var(--accent); font-weight: 600; }
.site-header a:hover { color: var(--ink); text-decoration: underline; }
.header-links { display: flex; align-items: center; gap: 24px; }
.header-links svg { display: block; }
.home { width: calc(100% - 310px); max-width: 1100px; margin-left: max(270px, calc((100vw - 1440px) / 2 + 270px)); padding: 24px 40px 0; }
.hero { max-width: 840px; padding: 12px 0 44px; }
.hero h1 { font: 400 52px/1.42 var(--serif); letter-spacing: -.025em; margin: 22px 0 26px; }
.hero h1 a { color: var(--ink); text-decoration: none; }
.hero h1 a:hover { color: var(--accent); }
.hero-lead { max-width: 700px; font-size: 18px; color: var(--muted); }
.guide-link { display: inline-flex; align-items: center; gap: 12px; margin-top: 24px; min-height: 44px; font-size: 18px; font-weight: 600; }
.guide-chapters { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--rule); }
.guide-chapters a { font-size: 14px; min-height: 36px; display: inline-flex; align-items: center; }
.guide-language { color: var(--muted); font-size: 13px; margin-top: 8px; }
.text-link { font-size: 14px; }
.research-direction { max-width: 840px; padding: 28px 0 40px; border-top: 1px solid var(--rule); }
.research-direction h2 { font-size: 23px; font-weight: 600; }
.research-loop { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px 12px; margin: 16px 0 12px; font-size: 14px; }
.research-loop > [aria-hidden], .loop-return { color: var(--muted); }
.loop-fork { color: var(--accent); }
.vision-note { color: var(--muted); font-size: 14px; max-width: 740px; }
.section-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 24px; margin-bottom: 28px; }
.section-heading h2 { font-size: 26px; font-weight: 600; }
.section-heading p { color: var(--muted); margin-top: 12px; max-width: 740px; font-size: 15px; }
.section-heading > a { flex-shrink: 0; }
.feature, .blog-section, .learning-section { border-top: 1px solid var(--rule); padding: 32px 0 56px; }
.case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
.case-media video { background: var(--panel); width: 100%; }
.case-media figcaption { margin-top: 12px; font-size: 13px; line-height: 1.8; color: var(--muted); }
.case-story h3 { font-size: 20px; margin-bottom: 20px; }
.case-sequence { margin: 0 0 20px; padding: 0; list-style: none; font-variant-numeric: tabular-nums; }
.case-sequence li { padding-bottom: 16px; }
.case-sequence strong { font-size: 14px; color: var(--ink); }
.case-sequence p { font-size: 14px; line-height: 1.9; color: var(--muted); }
.case-boundary { margin-top: 28px; border-top: 1px solid var(--rule); padding-top: 16px; font-size: 14px; color: var(--muted); }
.case-boundary summary { width: fit-content; color: var(--ink); cursor: pointer; }
.case-boundary p { max-width: 740px; margin-top: 16px; }
.topic-controls { display: flex; gap: 28px; border-bottom: 1px solid var(--rule); margin: 24px 0 0; }
.topic-controls button { color: var(--muted); background: transparent; border: 0; border-bottom: 2px solid transparent; padding: 12px 0; font-size: 15px; }
.topic-controls button:hover { color: var(--ink); }
.topic-controls button[aria-pressed="true"] { color: var(--accent); border-bottom-color: var(--accent); }
.topic-panel { display: grid; grid-template-columns: .8fr 1.2fr; gap: 36px; padding-top: 28px; }
.topic-intro h3 { font-size: 21px; }
.topic-intro p { color: var(--muted); margin: 16px 0; font-size: 15px; }
.reading-list { list-style: none; padding: 0; margin: 0; }
.reading-list li { border-bottom: 1px solid var(--rule); }
.reading-list li:first-child { border-top: 1px solid var(--rule); }
.reading-list a { display: block; padding: 18px 0; text-decoration: none; color: var(--ink); font-size: 15px; }
.reading-list a:hover { color: var(--accent); text-decoration: underline; }
.learning-map { list-style: none; padding: 12px 0 0; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.learning-map li { padding-left: 38px; position: relative; }
.step-number { position: absolute; left: 0; top: 0; color: var(--accent); font: 22px/1.55 var(--serif); }
.learning-map h3 { font-size: 18px; margin-bottom: 8px; }
.learning-map p { color: var(--muted); font-size: 14px; }
.learning-map small { display: block; font-size: 13px; color: var(--muted); margin: 6px 0 12px; }
.learning-map a { display: block; width: fit-content; font-size: 14px; }
.engine-paths { display: flex; align-items: baseline; gap: 24px; padding: 20px 0; border-block: 1px solid var(--rule); margin-top: 32px; }
.engine-paths > span { font-size: 13px; color: var(--muted); flex-shrink: 0; }
.engine-paths > div { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.engine-paths a { font-size: 14px; }
.knowledge-bridges { margin-top: 28px; }
.knowledge-bridges h3 { font-size: 18px; margin-bottom: 12px; }
.knowledge-bridges ul { list-style: none; padding: 0; margin: 0; }
.knowledge-bridges li { display: flex; align-items: baseline; gap: 16px; padding: 8px 0; font-size: 14px; }
.knowledge-bridges li > span { color: var(--muted); }
.language-note { font-size: 13px; color: var(--muted); margin-top: 24px; }
.technical-links { display: flex; gap: 12px 24px; flex-wrap: wrap; border-top: 1px solid var(--rule); padding: 24px 0 40px; font-size: 13px; }
.technical-links a { color: var(--muted); }
.site-footer { margin: 0 40px 0 max(310px, calc((100vw - 1440px) / 2 + 310px)); max-width: 1020px; border-top: 1px solid var(--rule); padding: 24px 0 40px; }
.site-footer .brand { font-size: 22px; }
.site-footer p { color: var(--muted); font-size: 14px; margin: 12px 0; }
.site-footer > div { display: flex; flex-wrap: wrap; gap: 12px 24px; }
.site-footer > div a { color: var(--muted); font-size: 13px; }
@media (max-width: 1100px) {
  .header-inner { flex-wrap: wrap; padding: 22px 32px 0; }
  .site-header nav { position: static; order: 3; width: 100%; flex-direction: row; flex-wrap: wrap; gap: 6px 26px; padding: 14px 0; margin-top: 18px; border-left: 0; border-block: 1px solid var(--rule); }
  .home { width: auto; max-width: 940px; margin: auto; padding: 20px 32px 0; }
  .hero h1 { font-size: 46px; }
  .site-footer { margin: 0 32px; }
}
@media (max-width: 700px) {
  .header-inner { padding: 18px 22px 0; }
  .brand { font-size: 24px; }
  .header-links { gap: 20px; }
  .site-header nav { gap: 4px 20px; margin-top: 14px; padding: 10px 0; }
  .site-header nav a { font-size: 13px; min-height: 32px; }
  .home { padding: 12px 22px 0; }
  .hero { padding: 8px 0 28px; }
  .hero h1 { font-size: clamp(28px, 8.7vw, 34px); line-height: 1.48; margin: 18px 0 22px; }
  html[lang="en"] .hero h1 br { display: none; }
  .hero-lead { font-size: 16px; }
  .guide-link { font-size: 16px; margin-top: 18px; }
  .guide-chapters { gap: 6px 20px; margin-top: 18px; padding-top: 12px; }
  .guide-chapters a { font-size: 13px; }
  .research-direction { padding: 24px 0 32px; }
  .research-direction h2 { font-size: 21px; }
  .research-loop { gap: 8px; }
  .research-loop .loop-return { width: 100%; }
  .section-heading { align-items: start; flex-direction: column; gap: 10px; margin-bottom: 24px; }
  .section-heading h2 { font-size: 24px; }
  .feature, .blog-section, .learning-section { padding: 28px 0 36px; }
  .case-grid, .topic-panel { grid-template-columns: 1fr; gap: 24px; }
  .topic-controls { justify-content: space-between; gap: 12px; }
  .topic-controls button { font-size: 13px; }
  .topic-panel { padding-top: 24px; }
  .learning-map { grid-template-columns: 1fr; gap: 26px; }
  .engine-paths { flex-direction: column; gap: 12px; }
  .engine-paths > div { gap: 8px 20px; }
  .knowledge-bridges li { display: grid; grid-template-columns: 1fr 16px 1fr; gap: 10px; font-size: 13px; }
  .technical-links { gap: 12px 20px; }
  .site-footer { margin: 0 22px; }
}
@media print {
  .site-header, .topic-controls, .site-footer, .technical-links, .skip-link { display: none !important; }
  .topic-panel[hidden] { display: grid !important; }
  .home { width: auto; max-width: none; margin: 0; padding: 0; }
  .hero { padding-top: 0; }
  .case-grid, .topic-panel, .learning-map { break-inside: avoid; }
}