/* 生物医学网络科学 · Biomedical Network Science
   Design: a scientific handbook. Turing Way-style knowledge tree on the left, Distill-style
   reading column in the middle (figures may use the full width), section index on the right.
   Network drawings and domain colours are the only ornament. */

/* ============================================================ tokens */
:root {
  --paper: #fafaf7;
  --sheet: #ffffff;
  --sunk: #f3f2ed;
  --ink: #191c23;
  --ink-2: #5b616e;
  --ink-3: #8a909c;
  --line: #e5e3dc;
  --line-2: #d6d3ca;
  --accent: #2b47c9;
  --accent-ink: #1f379f;
  --accent-soft: #eceffc;
  --hub: #c95a17;
  --hub-soft: #fbefe6;
  --bio: #0f7b62;
  --bio-soft: #e5f3ee;
  --ok: #1d8a4a;
  --bad: #c2332f;
  --code-bg: #f5f4ef;
  --code-ink: #24272e;
  --cell-bg: #12161f;
  --cell-fg: #e2e7f2;
  --shadow: 0 1px 2px rgba(20, 24, 33, .05), 0 6px 22px rgba(20, 24, 33, .06);
  --d-theory: #2b47c9; --d-dynamics: #7a3fc0; --d-brain: #0b7f9c; --d-symptom: #c2410c;
  --d-molecular: #0f7b62; --d-medicine: #b42357; --d-methods: #586174;
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --rail: 280px;
  --measure: 44rem;
  --topbar: 60px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #111318; --sheet: #171a21; --sunk: #1c2029; --ink: #e8eaef; --ink-2: #a6acb8; --ink-3: #7c8391;
    --line: #2a2f3a; --line-2: #363c49; --accent: #93a5ff; --accent-ink: #b4c1ff; --accent-soft: #1f2640;
    --hub: #f19a5f; --hub-soft: #33241b; --bio: #58c9a5; --bio-soft: #14302a; --ok: #4cc77d; --bad: #f07772;
    --code-bg: #1b1f27; --code-ink: #dfe3ea; --cell-bg: #0c0f15; --cell-fg: #e2e7f2;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 26px rgba(0, 0, 0, .35);
    --d-theory: #93a5ff; --d-dynamics: #c39bff; --d-brain: #5cc7e0; --d-symptom: #ff9e6b;
    --d-molecular: #58c9a5; --d-medicine: #ff7aa5; --d-methods: #a6acb8;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #111318; --sheet: #171a21; --sunk: #1c2029; --ink: #e8eaef; --ink-2: #a6acb8; --ink-3: #7c8391;
  --line: #2a2f3a; --line-2: #363c49; --accent: #93a5ff; --accent-ink: #b4c1ff; --accent-soft: #1f2640;
  --hub: #f19a5f; --hub-soft: #33241b; --bio: #58c9a5; --bio-soft: #14302a; --ok: #4cc77d; --bad: #f07772;
  --code-bg: #1b1f27; --code-ink: #dfe3ea; --cell-bg: #0c0f15; --cell-fg: #e2e7f2;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 26px rgba(0, 0, 0, .35);
  --d-theory: #93a5ff; --d-dynamics: #c39bff; --d-brain: #5cc7e0; --d-symptom: #ff9e6b;
  --d-molecular: #58c9a5; --d-medicine: #ff7aa5; --d-methods: #a6acb8;
  color-scheme: dark;
}
.dom-theory { --dc: var(--d-theory); } .dom-dynamics { --dc: var(--d-dynamics); } .dom-brain { --dc: var(--d-brain); }
.dom-symptom { --dc: var(--d-symptom); } .dom-molecular { --dc: var(--d-molecular); } .dom-medicine { --dc: var(--d-medicine); }
.dom-methods { --dc: var(--d-methods); }

/* ============================================================ base */
* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--topbar) + 16px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--font-body); font-size: 16.5px; line-height: 1.8;
  text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent); }
a:hover { color: var(--accent-ink); text-decoration-color: currentColor; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px;
}
img, video { max-width: 100%; }
h1, h2, h3, h4 { text-wrap: balance; }
::selection { background: color-mix(in srgb, var(--accent) 22%, transparent); }
.small { font-size: 13.5px; color: var(--ink-2); line-height: 1.7; }
.en { color: var(--ink-3); font-size: 13px; letter-spacing: .01em; margin: 0; }
.en.big { font-size: 15px; margin: 6px 0 0; color: var(--ink-2); }
.lead { font-size: 18px; line-height: 1.75; color: var(--ink-2); max-width: 40em; margin: 14px 0 0; }

/* ============================================================ top bar */
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 30; background: var(--sheet); }
.topbar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: color-mix(in srgb, var(--sheet) 92%, transparent); backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.topbar-inner { display: flex; align-items: center; gap: 14px; height: var(--topbar); max-width: 1560px; margin: 0 auto; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; white-space: nowrap; line-height: 1.15; }
.brand svg { flex: none; }
.brand span { font-family: var(--font-display); font-weight: 700; font-size: 17px; }
.brand small { display: block; font-family: var(--font-body); font-weight: 500; font-size: 10.5px; letter-spacing: .14em; color: var(--ink-3); text-transform: uppercase; }
.topnav { display: flex; gap: 2px; margin-left: auto; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; min-width: 0; }
.topnav::-webkit-scrollbar { display: none; }
.topnav a { color: var(--ink-2); text-decoration: none; font-size: 14.5px; padding: 7px 11px; border-radius: 7px; white-space: nowrap; }
.topnav a:hover { color: var(--ink); background: var(--sunk); }
.topnav a[aria-current="page"] { color: var(--accent-ink); background: var(--accent-soft); font-weight: 600; }
.top-search { flex: 0 1 230px; min-width: 0; position: relative; }
.top-search input { width: 100%; font: inherit; font-size: 13.5px; padding: 7px 12px 7px 32px; border: 1px solid var(--line); border-radius: 8px; background: var(--paper); color: var(--ink); }
.top-search::before { content: ""; position: absolute; left: 11px; top: 50%; width: 11px; height: 11px; border: 1.6px solid var(--ink-3); border-radius: 50%; transform: translateY(-62%); }
.top-search::after { content: ""; position: absolute; left: 21px; top: 57%; width: 5px; height: 1.6px; background: var(--ink-3); transform: rotate(45deg); }
.theme-btn, .menu-btn { border: 1px solid var(--line); background: var(--sheet); color: var(--ink-2); border-radius: 8px; height: 34px; min-width: 34px; cursor: pointer; flex: none; font: inherit; font-size: 14px; }
.menu-btn { display: none; padding: 0 10px; gap: 6px; align-items: center; }
@media (max-width: 1240px) { .top-search { display: none; } }
@media (max-width: 1060px) {
  .menu-btn { display: inline-flex; }
  .brand small { display: none; }
}
@media (max-width: 720px) { .topnav { display: none; } .brand span { font-size: 16px; } }

/* ============================================================ shell: rail + main */
.shell {
  display: grid; grid-template-columns: var(--rail) minmax(0, 1fr); gap: 48px;
  max-width: 1560px; margin: 0 auto; overflow-x: clip;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.shell.wide { grid-template-columns: minmax(0, 1fr); }
main { min-width: 0; padding-block: 34px 80px; }

/* knowledge tree (Turing Way-style) */
.rail {
  position: sticky; top: calc(env(safe-area-inset-top, 0px) + var(--topbar)); align-self: start;
  max-height: calc(100vh - var(--topbar)); overflow-y: auto; overscroll-behavior: contain;
  padding: 26px 8px 40px 0; font-size: 14px; scrollbar-width: thin;
}
.rail-search { margin: 0 0 14px; }
.rail-search input { width: 100%; font: inherit; font-size: 13.5px; padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--sheet); color: var(--ink); }
.tree details { border-left: 3px solid transparent; margin: 2px 0; }
.tree details[open] { border-left-color: var(--dc, var(--line)); }
.tree summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 8px; padding: 6px 8px; border-radius: 0 7px 7px 0;
  font-weight: 600; font-size: 13.5px; color: var(--ink); letter-spacing: .01em; }
.tree summary::-webkit-details-marker { display: none; }
.tree summary::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--dc, var(--ink-3)); flex: none; }
.tree summary::after { content: "›"; margin-left: auto; color: var(--ink-3); transition: transform .15s; font-weight: 400; }
.tree details[open] > summary::after { transform: rotate(90deg); }
.tree summary:hover { background: var(--sunk); }
.tree ol { list-style: none; margin: 2px 0 8px; padding: 0 0 0 14px; }
.tree li a { display: block; padding: 4px 10px; border-radius: 6px; color: var(--ink-2); text-decoration: none; line-height: 1.45; }
.tree li a:hover { color: var(--ink); background: var(--sunk); }
.tree li a[aria-current="page"] { color: var(--accent-ink); background: var(--accent-soft); font-weight: 600; }
.tree ol.sub { margin: 2px 0 6px 10px; padding-left: 8px; border-left: 1px solid var(--line); }
.tree ol.sub a { font-size: 13px; padding: 3px 8px; }
.tree ol.sub a .n { font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); margin-right: 6px; }
.tree .tree-links { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); display: grid; gap: 2px; }
.tree .tree-links a { display: block; padding: 4px 10px; color: var(--ink-2); text-decoration: none; border-radius: 6px; font-size: 13.5px; }
.tree .tree-links a:hover { background: var(--sunk); color: var(--ink); }

@media (max-width: 1060px) {
  .shell { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .rail {
    position: fixed; top: 0; left: 0; bottom: 0; width: min(86vw, 340px); max-height: none; z-index: 60;
    background: var(--sheet); border-right: 1px solid var(--line); box-shadow: var(--shadow);
    padding: calc(env(safe-area-inset-top, 0px) + 18px) 14px 40px max(16px, env(safe-area-inset-left, 0px));
    transform: translateX(-105%); transition: transform .22s ease; visibility: hidden;
  }
  body.nav-open .rail { transform: none; visibility: visible; }
  .nav-scrim { position: fixed; inset: 0; z-index: 55; background: rgba(10, 12, 18, .38); }
}
.nav-scrim[hidden] { display: none; }

/* ============================================================ page heads */
.lec-head, .doc-head { padding-bottom: 26px; margin-bottom: 30px; border-bottom: 1px solid var(--line); }
.lec-head h1, .doc-head h1 { font-family: var(--font-display); font-size: clamp(30px, 3.6vw, 44px); line-height: 1.22; margin: 8px 0 0; letter-spacing: -.005em; }
.crumb { font-size: 13px; color: var(--ink-3); display: flex; flex-wrap: wrap; gap: 4px 8px; align-items: center; }
.crumb a { color: var(--ink-2); text-decoration: none; }
.crumb a:hover { color: var(--accent); text-decoration: underline; }
.crumb .sep { color: var(--ink-3); }
.eyebrow { font-size: 12.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: baseline; }
.eyebrow b { color: var(--dc, var(--accent)); font-weight: 700; }
.doc-head { border-top: 4px solid var(--dc, var(--accent)); padding-top: 22px; }
.doc-head .dek { font-size: 19px; line-height: 1.7; color: var(--ink-2); max-width: 38em; margin: 14px 0 0; }
.doc-meta { display: flex; flex-wrap: wrap; gap: 6px 22px; margin-top: 20px; font-size: 13px; color: var(--ink-2); }
.doc-meta div { display: grid; gap: 1px; }
.doc-meta dt { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.doc-meta dd { margin: 0; color: var(--ink); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.chip { font-size: 12.5px; padding: 2px 10px; border-radius: 999px; background: var(--sunk); color: var(--ink-2); border: 1px solid var(--line); }
.objectives { background: var(--sheet); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; margin-top: 20px; }
.objectives h2 { font-size: 13px; margin: 0 0 6px; font-family: var(--font-body); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }

/* ============================================================ article grid + TOC */
.lec-grid { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 56px; }
@media (max-width: 1380px) { .lec-grid { grid-template-columns: minmax(0, 1fr); } .lec-grid > .toc { display: none; } }
.toc { position: sticky; top: calc(env(safe-area-inset-top, 0px) + var(--topbar) + 26px); align-self: start; max-height: calc(100vh - var(--topbar) - 50px); overflow-y: auto; font-size: 13px; padding-left: 14px; border-left: 1px solid var(--line); }
.toc b { display: block; font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 8px; }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 1px; }
.toc li.sub { padding-left: 12px; }
.toc a { color: var(--ink-2); text-decoration: none; display: block; padding: 3px 0; line-height: 1.45; }
.toc a:hover { color: var(--ink); }
.toc a.on { color: var(--accent-ink); font-weight: 600; box-shadow: -15px 0 0 -13px var(--accent); }
.read-progress { position: fixed; top: env(safe-area-inset-top, 0px); left: 0; height: 2px; background: var(--dc, var(--accent)); z-index: 40; width: 0; }

/* ============================================================ sections & tags */
.block { margin: 46px 0; }
.block > h2 { font-family: var(--font-display); font-size: 25px; line-height: 1.35; margin: 0 0 16px; display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; }
.block > h2 .tag { font-family: var(--font-body); font-size: 11.5px; font-weight: 700; letter-spacing: .14em; color: var(--dc, var(--hub)); text-transform: uppercase; }
.block > h3 { font-size: 16px; margin: 26px 0 10px; }

/* ============================================================ prose (Distill-like) */
.prose { font-size: 17px; line-height: 1.85; }
.prose > * { max-width: var(--measure); }
.prose > .table-wrap, .prose > .demo, .prose > figure, .prose > .video-main, .prose > .sourceCode, .prose > div.sourceCode, .prose > .wide { max-width: none; }
.prose h2 { font-family: var(--font-display); font-size: 25px; line-height: 1.4; margin: 2.2em 0 .6em; }
.prose h3 { font-size: 19px; line-height: 1.5; margin: 1.9em 0 .5em; }
.prose h4 { font-size: 16.5px; margin: 1.6em 0 .4em; }
.prose p { margin: 0 0 1.05em; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.1em; }
.prose li { margin: .25em 0; }
.prose li > p { margin: 0 0 .4em; }
.prose strong { font-weight: 650; }
.prose blockquote { margin: 1.4em 0; padding: 2px 0 2px 20px; border-left: 3px solid var(--line-2); color: var(--ink-2); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.4em 0; }
.prose code { font-family: var(--font-mono); font-size: .84em; background: var(--sunk); padding: 1px 5px; border-radius: 4px; }
.prose math[display="block"] { display: block; overflow-x: auto; overflow-y: hidden; padding: .4em 0; margin: .6em 0 1em; max-width: 100%; }
math { font-size: 1.04em; }
.table-wrap { overflow-x: auto; margin: 1.4em 0; border: 1px solid var(--line); border-radius: 10px; background: var(--sheet); }
.prose table, .table-wrap table { border-collapse: collapse; width: 100%; font-size: 14.5px; line-height: 1.65; }
.table-wrap th, .table-wrap td { border-bottom: 1px solid var(--line); padding: 9px 14px; text-align: left; vertical-align: top; }
.table-wrap thead th { background: var(--sunk); font-weight: 650; font-size: 13.5px; white-space: nowrap; }
.table-wrap tbody tr:last-child td { border-bottom: 0; }
table.kv th { width: 9em; white-space: nowrap; color: var(--ink-2); font-weight: 600; background: var(--sunk); }
table.kv td p { margin: 0; }
.prose figure { margin: 1.8em 0; }
.prose figure img { display: block; width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--line); background: #fff; }
.prose figcaption { font-size: 13.5px; color: var(--ink-2); margin-top: 10px; line-height: 1.65; max-width: var(--measure); }

/* callouts: rule + small-caps label */
.callout-def, .callout-warn, .callout-bio { position: relative; margin: 1.6em 0; padding: 14px 18px 4px; border-left: 3px solid; border-radius: 0 10px 10px 0; font-size: 16px; }
.callout-def::before, .callout-warn::before, .callout-bio::before { display: block; font-size: 11px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; margin-bottom: 4px; }
.callout-def { background: var(--accent-soft); border-color: var(--accent); }
.callout-def::before { content: "定义 · Definition"; color: var(--accent-ink); }
.callout-warn { background: var(--hub-soft); border-color: var(--hub); }
.callout-warn::before { content: "注意 · Caveat"; color: var(--hub); }
.callout-bio { background: var(--bio-soft); border-color: var(--bio); }
.callout-bio::before { content: "生物医学实例 · Example"; color: var(--bio); }

/* code blocks (pandoc highlighting) */
div.sourceCode, pre.sourceCode, .prose pre { background: var(--code-bg); color: var(--code-ink); border-radius: 10px; border: 1px solid var(--line); margin: 1.2em 0; overflow-x: auto; }
.prose pre, pre.sourceCode { padding: 14px 18px; font-family: var(--font-mono); font-size: 13.5px; line-height: 1.65; }
div.sourceCode pre.sourceCode { margin: 0; border: 0; }
.prose pre code, pre.sourceCode code { background: none; padding: 0; font-size: inherit; }
code span.kw, code span.cf { color: #9b2c80; font-weight: 600; }
code span.dt, code span.bu { color: #2b47c9; }
code span.dv, code span.fl, code span.bn, code span.cn { color: #b4530f; }
code span.st, code span.ch, code span.ss, code span.vs { color: #11806a; }
code span.co { color: #8a909c; font-style: italic; }
code span.fu { color: #2f5bb7; }
code span.im, code span.op, code span.ot { color: #5b616e; }
code span.at, code span.va { color: #7a3fc0; }
:root[data-theme="dark"] code span.kw, :root[data-theme="dark"] code span.cf { color: #e48ccc; }
:root[data-theme="dark"] code span.dt, :root[data-theme="dark"] code span.bu, :root[data-theme="dark"] code span.fu { color: #93a5ff; }
:root[data-theme="dark"] code span.dv, :root[data-theme="dark"] code span.fl { color: #f3a76a; }
:root[data-theme="dark"] code span.st { color: #6fd6b4; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) code span.kw, :root:not([data-theme="light"]) code span.cf { color: #e48ccc; }
  :root:not([data-theme="light"]) code span.dt, :root:not([data-theme="light"]) code span.bu, :root:not([data-theme="light"]) code span.fu { color: #93a5ff; }
  :root:not([data-theme="light"]) code span.dv, :root:not([data-theme="light"]) code span.fl { color: #f3a76a; }
  :root:not([data-theme="light"]) code span.st { color: #6fd6b4; }
}

/* references (Distill-like appendix) */
.appendix { margin-top: 56px; padding-top: 26px; border-top: 1px solid var(--line); color: var(--ink-2); font-size: 14px; }
.appendix h2 { font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); font-family: var(--font-body); margin: 0 0 12px; }
.appendix ol { padding-left: 1.4em; margin: 0; display: grid; gap: 6px; }
.appendix li { line-height: 1.6; }
.appendix a { word-break: break-all; }
.reviewed { color: var(--ink-3); margin-top: 22px; font-size: 13px; }

/* ============================================================ buttons, filters */
.btn { font: inherit; font-size: 14px; line-height: 1.4; border: 1px solid var(--accent); background: var(--accent); color: #fff; border-radius: 8px; padding: 6px 14px; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.btn:hover { background: var(--accent-ink); border-color: var(--accent-ink); color: #fff; }
:root[data-theme="dark"] .btn { color: #0f1220; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn { color: #0f1220; } }
.btn.ghost { background: transparent; color: var(--accent); border-color: var(--line-2); }
.btn.ghost:hover { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-ink); }
.btn:disabled { opacity: .5; cursor: default; }
.pfilters { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 16px; }
.pfilters .btn { font-size: 13px; padding: 4px 12px; }
.pfilters .btn[aria-pressed="true"] { background: var(--ink); color: var(--sheet); border-color: var(--ink); }
.filter { width: 100%; max-width: 420px; font: inherit; font-size: 14px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--sheet); color: var(--ink); }
.pfilters .filter { flex: 1 1 220px; min-width: 0; }

/* ============================================================ cards */
.dgrid, .tgrid, .pgrid, .rgrid, .labgrid, .arts, .entry3 { display: grid; gap: 14px; }
.dgrid { grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); }
.tgrid { grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); }
.pgrid { grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); }
.rgrid { grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr)); gap: 10px; }
.labgrid { grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr)); gap: 10px; }
.arts { grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 10px; }
.entry3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); }
.card-base, .dcard, .tcard, .pcard, .rcard, .labitem, .art, .entry3 a, .gcard {
  background: var(--sheet); border: 1px solid var(--line); border-radius: 12px; color: var(--ink); text-decoration: none; min-width: 0;
  transition: border-color .15s, box-shadow .15s, transform .15s;
}
a.dcard:hover, .tcard:hover, .pcard:hover, .rcard:hover, .labitem:hover, .art:hover, .entry3 a:hover, .gcard:hover { border-color: var(--line-2); box-shadow: var(--shadow); }

.dcard { display: flex; flex-direction: column; gap: 6px; padding: 18px 20px; border-top: 3px solid var(--dc, var(--accent)); }
.dcard .en { color: var(--dc); font-size: 11.5px; text-transform: uppercase; letter-spacing: .12em; font-weight: 700; }
.dcard b { font-family: var(--font-display); font-size: 21px; line-height: 1.35; }
.dcard .d { font-size: 14px; color: var(--ink-2); line-height: 1.65; }
.dcard .ts { font-size: 13px; color: var(--ink-2); line-height: 1.75; margin-top: auto; padding-top: 10px; border-top: 1px dashed var(--line); }
.dcard .dhead { display: flex; flex-direction: column; gap: 4px; text-decoration: none; color: var(--ink); }
.dcard .dhead:hover b { color: var(--dc); }
.dcard ul { list-style: none; margin: 8px 0 0; padding: 10px 0 0; border-top: 1px dashed var(--line); display: grid; gap: 3px; font-size: 14px; }
.dcard ul a { color: var(--ink); text-decoration: none; }
.dcard ul a:hover { color: var(--dc); text-decoration: underline; }
.dcard .cnt { font-size: 12px; color: var(--ink-3); }

.tcard { padding: 18px 20px; border-left: 3px solid var(--dc, var(--line)); }
.tcard h3 { margin: 0; font-size: 18px; line-height: 1.4; font-family: var(--font-display); }
.tcard h3 a { color: var(--ink); text-decoration: none; }
.tcard h3 a:hover { color: var(--accent); }
.tcard .d { font-size: 14px; color: var(--ink-2); line-height: 1.65; margin: 6px 0 0; }
.artlist { margin: 10px 0 0; padding-left: 1.3em; font-size: 13.5px; line-height: 1.85; color: var(--ink-3); }
.artlist a { color: var(--ink-2); text-decoration: none; }
.artlist a:hover { color: var(--accent); text-decoration: underline; }

.art { display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 2px 8px; padding: 13px 15px; }
.art .no { grid-row: span 2; font-family: var(--font-mono); font-size: 13px; color: var(--dc, var(--accent)); padding-top: 2px; }
.art .t { font-weight: 650; font-size: 15.5px; line-height: 1.45; }
.art .d { font-size: 13px; color: var(--ink-2); line-height: 1.6; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }

.pcard { padding: 16px 18px; display: flex; flex-direction: column; gap: 8px; }
.pcard h3 { margin: 0; font-size: 16.5px; line-height: 1.45; font-family: var(--font-display); }
.pcard h3 a { color: var(--ink); text-decoration: none; }
.pcard h3 a:hover { color: var(--accent); }
.pmeta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; font-size: 12.5px; color: var(--ink-3); }
.pbadge { font-size: 11px; padding: 1px 8px; border-radius: 999px; background: var(--sunk); color: var(--ink-2); border: 1px solid var(--line); letter-spacing: .02em; }
.pbadge.vid { background: var(--bio-soft); color: var(--bio); border-color: transparent; }
.pbadge.dm { background: none; }
.porig { margin: 0; font-size: 13px; color: var(--ink-3); line-height: 1.5; overflow-wrap: anywhere; }
.porig span { font-size: 12px; }
.porig.big { font-size: 15.5px; margin: 8px 0 4px; color: var(--ink-2); }
.psum { margin: 0; font-size: 14px; line-height: 1.7; color: var(--ink-2); }
.plec { margin-top: auto; color: var(--ink-3); }
.plec a { margin-right: 6px; }

.rcard { display: flex; flex-direction: column; gap: 4px; padding: 13px 15px; }
.rcard .kind { font-size: 11px; color: var(--ink-3); letter-spacing: .1em; text-transform: uppercase; }
.rcard b { font-size: 15.5px; }
.rcard .d { font-size: 13px; color: var(--ink-2); line-height: 1.6; }
.labitem { display: flex; flex-direction: column; gap: 3px; padding: 13px 15px; }
.labitem span { font-size: 12.5px; color: var(--ink-3); }
.entry3 a { display: flex; flex-direction: column; gap: 6px; padding: 18px 20px; }
.entry3 b { font-size: 17px; font-family: var(--font-display); }
.entry3 span { font-size: 14px; color: var(--ink-2); line-height: 1.65; }
.linklist { columns: 2 240px; padding-left: 1.2em; line-height: 1.9; }
.related-box { background: var(--sheet); border: 1px solid var(--line); border-radius: 12px; padding: 18px 22px; }
.related-box > h2 { font-size: 18px; margin-bottom: 8px; }
.related-box ul { margin: 0; padding-left: 1.1em; line-height: 1.9; font-size: 14.5px; }
.ext-card { display: flex; flex-wrap: wrap; gap: 14px 20px; align-items: center; justify-content: space-between; background: var(--sheet); border: 1px solid var(--line); border-left: 3px solid var(--hub); border-radius: 12px; padding: 16px 20px; }
.ext-card > div { flex: 1 1 320px; min-width: 0; }

/* ============================================================ pager */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 56px; }
.pager a, .pager span { display: flex; flex-direction: column; gap: 2px; padding: 14px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--sheet); text-decoration: none; color: var(--ink); font-size: 15px; line-height: 1.45; }
.pager a small { font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.pager a:last-child { text-align: right; }
.pager a:hover { border-color: var(--accent); }
@media (max-width: 560px) { .pager { grid-template-columns: 1fr; } .pager a:last-child { text-align: left; } }

/* ============================================================ video */
.video-main { background: var(--sheet); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.video-main video { display: block; width: 100%; aspect-ratio: 16/9; background: #000; }
.video-meta { padding: 12px 18px; display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: baseline; font-size: 14px; color: var(--ink-2); }
.video-meta strong { color: var(--ink); font-size: 16px; }
.transcript { border-top: 1px solid var(--line); padding: 10px 18px; font-size: 14.5px; }
.transcript summary { cursor: pointer; color: var(--accent); }
.transcript p { margin: 8px 0; color: var(--ink-2); }
.vlist { list-style: none; padding: 0; margin: 14px 0 0; display: grid; gap: 8px; }
.vlist li { padding: 10px 14px; background: var(--sheet); border: 1px solid var(--line); border-radius: 10px; font-size: 14.5px; }
.vlist .vtype { color: var(--ink-3); font-size: 13px; }
.vlist .video-main { margin-top: 10px; }

/* ============================================================ interactive demos (Seeing Theory-style) */
.demo { container-type: inline-size; background: var(--sheet); border: 1px solid var(--line); border-radius: 16px; padding: 20px 22px; margin: 22px 0; box-shadow: var(--shadow); }
.demo h3 { margin: 0 0 4px; font-size: 18px; font-family: var(--font-display); }
.demo h3::before { content: "交互 · Interactive"; display: block; font-family: var(--font-body); font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--dc, var(--hub)); font-weight: 700; margin-bottom: 2px; }
.demo .hint { margin: 0 0 12px; font-size: 14.5px; line-height: 1.7; color: var(--ink-2); }
.demo-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-start; }
.demo canvas { display: block; max-width: 100%; height: auto; border-radius: 10px; background: var(--paper); border: 1px solid var(--line); touch-action: none; }
.demo .controls { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; margin: 12px 0; font-size: 14px; }
.demo .controls label { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.demo .controls input[type=range] { width: 170px; accent-color: var(--accent); }
.demo .controls select { font: inherit; font-size: 13.5px; padding: 3px 6px; border-radius: 6px; border: 1px solid var(--line-2); background: var(--sheet); color: var(--ink); }
.demo .readout { font-family: var(--font-mono); font-size: 13px; color: var(--ink); font-variant-numeric: tabular-nums; }
.demo-inner > p.readout { background: var(--sunk); border-radius: 8px; padding: 8px 12px; margin: 10px 0 0; line-height: 1.6; }
.demo-export { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.demo-export .btn { font-size: 12.5px; padding: 3px 10px; }
@container (min-width: 820px) {
  .demo-inner { display: grid; grid-template-columns: 280px minmax(0, 1fr); column-gap: 28px; align-items: start; }
  .demo-inner > * { grid-column: 1; }
  .demo-inner > .demo-row, .demo-inner > canvas { grid-column: 2; grid-row: 1 / span 30; }
  .demo-inner > .demo-row ~ .demo-row { grid-row: auto; }
  .demo-inner .controls { flex-direction: column; align-items: stretch; gap: 12px; }
  .demo-inner .controls label { justify-content: space-between; }
  .demo-inner .controls input[type=range] { width: 100%; }
}

/* ============================================================ code cells (Pyodide) & gallery */
.cell { margin: 16px 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--sheet); }
.cell-head { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; padding: 9px 14px; border-bottom: 1px solid var(--line); }
.cell-head h3 { margin: 0; font-size: 15px; }
.cell-head .btn { font-size: 13px; padding: 3px 10px; }
.cell textarea { display: block; width: 100%; min-height: 200px; border: 0; resize: vertical; padding: 14px 16px; background: var(--cell-bg); color: var(--cell-fg); font-family: var(--font-mono); font-size: 13px; line-height: 1.6; tab-size: 4; white-space: pre; overflow-x: auto; }
.cell .out { padding: 10px 16px; font-family: var(--font-mono); font-size: 13px; white-space: pre-wrap; border-top: 1px solid var(--line); max-height: 460px; overflow: auto; }
.cell .out:empty { display: none; }
.cell .out img { display: block; max-width: 100%; background: #fff; border-radius: 6px; margin: 8px 0; }
.cell .out .err { color: var(--bad); }
.py-status { font-size: 13.5px; color: var(--ink-2); }

.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 210px), 1fr)); gap: 14px; }
.gcard { display: flex; flex-direction: column; overflow: hidden; }
.gcard .thumb { aspect-ratio: 4 / 3; background: #fff; border-bottom: 1px solid var(--line); display: grid; place-items: center; overflow: hidden; }
.gcard .thumb img { width: 100%; height: 100%; object-fit: contain; padding: 6px; }
.gcard .thumb pre { margin: 0; padding: 10px 12px; width: 100%; height: 100%; font-family: var(--font-mono); font-size: 10.5px; line-height: 1.5; color: #3d4350; background: var(--code-bg); overflow: hidden; white-space: pre-wrap; }
:root[data-theme="dark"] .gcard .thumb pre { color: var(--code-ink); }
.gcard .gt { padding: 10px 12px 12px; font-size: 13.5px; line-height: 1.5; font-weight: 600; }
.gcard .gt small { display: block; font-weight: 400; color: var(--ink-3); font-size: 12px; margin-top: 3px; }
.gallery-group { margin: 30px 0 10px; }
.gallery-group h3 { font-family: var(--font-display); font-size: 19px; margin: 0 0 4px; }
.gallery-group h3 a { color: var(--ink); text-decoration: none; }
.gallery-group .small { margin: 0 0 12px; }
.ex-figs { display: grid; gap: 14px; margin: 18px 0; }
.ex-figs img { display: block; width: 100%; max-width: 860px; height: auto; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 8px; }
.ex-out { background: var(--code-bg); color: var(--code-ink); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; font-family: var(--font-mono); font-size: 13px; line-height: 1.6; white-space: pre-wrap; overflow-x: auto; max-height: 520px; }
.ex-actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }

/* ============================================================ home */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 40px; align-items: center; padding-block: 28px 40px; }
.hero .kicker { font-size: 12px; letter-spacing: .2em; text-transform: uppercase; color: var(--hub); font-weight: 700; }
.hero h1 { font-family: var(--font-display); font-size: clamp(36px, 5.2vw, 64px); line-height: 1.12; margin: 12px 0 18px; letter-spacing: -.01em; }
.hero p.lead { font-size: 18.5px; }
.hero-search { display: flex; gap: 8px; margin-top: 24px; max-width: 580px; }
.hero-search input { flex: 1; min-width: 0; font: inherit; font-size: 15.5px; padding: 12px 16px; border: 1px solid var(--line-2); border-radius: 12px; background: var(--sheet); color: var(--ink); box-shadow: var(--shadow); }
.hero-search .btn { padding: 0 18px; border-radius: 12px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; font-size: 13px; color: var(--ink-3); }
.hero-tags a { color: var(--ink-2); text-decoration: none; border: 1px solid var(--line); border-radius: 999px; padding: 1px 10px; background: var(--sheet); }
.hero-tags a:hover { border-color: var(--accent); color: var(--accent); }
.kmap { position: relative; border: 1px solid var(--line); border-radius: 18px; background: var(--sheet); box-shadow: var(--shadow); overflow: hidden; }
.kmap canvas { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; cursor: pointer; }
.kmap .kmap-cap { display: block; padding: 0 16px 14px; font-size: 12px; color: var(--ink-3); }
.kmap .kmap-legend { display: flex; flex-wrap: wrap; gap: 4px 14px; padding: 4px 16px 6px; font-size: 12px; color: var(--ink-2); border-top: 1px solid var(--line); padding-top: 10px; }
.kmap .kmap-legend span::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--dc); margin-right: 6px; }
@media (max-width: 900px) { .hero { grid-template-columns: minmax(0, 1fr); } }
.home-sec { margin: 64px 0; }
.home-sec > h2 { font-family: var(--font-display); font-size: 28px; margin: 0 0 6px; }
.home-sec > p.small { margin: 0 0 18px; font-size: 15px; }
.home-sec .tag { display: block; font-size: 11.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--hub); font-weight: 700; margin-bottom: 4px; }
.chain { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: var(--sheet); }
.chain div { padding: 16px 16px 18px; border-right: 1px solid var(--line); }
.chain div:last-child { border-right: 0; }
.chain b { display: block; font-family: var(--font-display); font-size: 17px; margin: 4px 0 4px; }
.chain span { font-size: 13px; color: var(--ink-2); line-height: 1.6; }
.chain i { font-style: normal; font-family: var(--font-mono); font-size: 12px; color: var(--hub); }
@media (max-width: 860px) { .chain { grid-template-columns: 1fr; } .chain div { border-right: 0; border-bottom: 1px solid var(--line); } }

/* ============================================================ glossary, search, resources */
.gloss { display: grid; gap: 10px; min-width: 0; }
.gloss .term { background: var(--sheet); border: 1px solid var(--line); border-radius: 12px; padding: 12px 18px; min-width: 0; overflow-wrap: anywhere; }
.gloss .term p { margin: 4px 0; }
.gloss .term math[display="block"] { display: block; max-width: 100%; overflow-x: auto; overflow-y: hidden; }
.term-dom { font-size: 11px; color: var(--ink-3); letter-spacing: .12em; text-transform: uppercase; margin-bottom: 2px; }
.term .src { margin: 8px 0 0; }
.term.hit { outline: 2px solid var(--accent); }
.kinds { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 16px; }
.kinds .btn { font-size: 13px; padding: 3px 11px; }
.kinds .btn[aria-pressed="true"] { background: var(--ink); color: var(--sheet); border-color: var(--ink); }
.results { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.results li { background: var(--sheet); border: 1px solid var(--line); border-radius: 12px; padding: 13px 18px; }
.results a { display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; text-decoration: none; color: var(--ink); }
.results a:hover b { color: var(--accent); }
.results .rk { font-size: 11px; padding: 1px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent-ink); }
.results b { font-size: 16px; }
.results .rd { font-size: 12.5px; color: var(--ink-3); }
.results p { margin: 6px 0 0; font-size: 13.5px; color: var(--ink-2); line-height: 1.65; }
.results mark { background: var(--hub-soft); color: var(--ink); padding: 0 1px; border-radius: 2px; }

/* ============================================================ footer */
footer.site { border-top: 1px solid var(--line); color: var(--ink-3); font-size: 13px; padding-block: 26px 34px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); background: var(--sheet); }
footer.site div { max-width: 1560px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: center; }
footer.site b { font-family: var(--font-display); color: var(--ink); font-size: 15px; }
footer.site a { color: var(--ink-2); text-decoration: none; }
footer.site a:hover { color: var(--accent); }

/* ============================================================ misc kept from earlier versions */
.ask-float { position: absolute; z-index: 50; font-size: 13px; padding: 3px 10px; box-shadow: var(--shadow); }
.task-list { list-style: none; padding-left: 0; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }
@media print { .rail, .topbar, .toc, footer.site, .demo-export { display: none !important; } .shell { display: block; } }