/* Behind the Secrets of LLMs, lab website.
   No web fonts and no frameworks: system fonts, CSS variables, one file. */

/* ---------------------------------------------------------------- tokens */
:root {
  /* blue and white: one blue for everything that is highlighted, sky blue and indigo next to it */
  --bg: #ffffff;
  --bg-soft: #f5f8fe;
  --surface: #ffffff;
  --surface-2: #edf2fb;
  --line: #e0e7f1;
  --line-strong: #c5d0e0;
  --text: #0c1629;
  --muted: #45526a;
  --faint: #64728a;
  --accent: #1d4ed8;             /* small type: labels, links, numbers */
  --accent-big: #2563eb;         /* large type */
  --accent-soft: rgba(37, 99, 235, .09);
  --accent-fill: #2563eb;        /* buttons, badges, bars, sliders, the selection */
  --accent-ink: #ffffff;
  --accent-2: #0369a1;           /* sky blue, the second tone */
  --accent-2-soft: rgba(2, 132, 199, .09);
  --accent-2-fill: #38bdf8;
  --violet: #4f46e5;             /* indigo, the third tone */
  --violet-soft: rgba(79, 70, 229, .08);
  --green: #0f766e;              /* tips, "ok" */
  --green-soft: rgba(15, 118, 110, .09);
  --red: #be123c;                /* warnings, errors */
  --red-soft: rgba(190, 18, 60, .07);
  --code-bg: #f5f8fe;
  --code-text: #14213a;
  --code-num: #be185d;
  --shadow: 0 18px 44px -26px rgba(12, 22, 41, .38);
  --top-bg: rgba(255, 255, 255, .9);
  --btn-bg: #2563eb;
  --btn-ink: #ffffff;

  --radius: 14px;
  --radius-sm: 9px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif;
  --top-h: 62px;
}
:root[data-theme="dark"] {
  /* only when the reader switches it on */
  --bg: #0a0f1c;
  --bg-soft: #0e1424;
  --surface: #131a2c;
  --surface-2: #1a233a;
  --line: #243049;
  --line-strong: #37466a;
  --text: #e8eefb;
  --muted: #a4b1ca;
  --faint: #7888a6;
  --accent: #8ab4ff;
  --accent-big: #8ab4ff;
  --accent-soft: rgba(96, 165, 250, .14);
  --accent-fill: #2563eb;
  --accent-ink: #ffffff;
  --accent-2: #67d0f7;
  --accent-2-soft: rgba(56, 189, 248, .13);
  --accent-2-fill: #38bdf8;
  --violet: #a5b4fc;
  --violet-soft: rgba(165, 180, 252, .13);
  --green: #5eead4;
  --green-soft: rgba(94, 234, 212, .12);
  --red: #fb7185;
  --red-soft: rgba(251, 113, 133, .12);
  --code-bg: #0c1220;
  --code-text: #dfe6f5;
  --code-num: #f9a8d4;
  --shadow: 0 24px 60px -28px rgba(0, 0, 0, .85);
  --top-bg: rgba(10, 15, 28, .84);
  --btn-bg: #2563eb;
  --btn-ink: #ffffff;
}

/* ---------------------------------------------------------------- base */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--top-h) + 18px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16.5px/1.65 var(--sans); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--accent-fill); color: var(--accent-ink); }
h1, h2, h3, h4 { line-height: 1.18; letter-spacing: -.018em; margin: 0; text-wrap: balance; }
p { margin: 0 0 1em; }
code, kbd, pre, samp { font-family: var(--mono); }
hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }
.wrap { max-width: 1200px; margin-inline: auto; padding-inline: clamp(18px, 4vw, 40px); }
.skip { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--accent-fill); color: var(--accent-ink); padding: 8px 14px; border-radius: 8px; font-weight: 600; }
.skip:focus { left: 8px; }
.eyebrow { font: 600 .76rem/1.3 var(--mono); letter-spacing: .15em; text-transform: uppercase; color: var(--accent); margin: 0 0 .9rem; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------------------------------------------------------------- top bar */
.top { position: sticky; top: 0; z-index: 50; background: var(--top-bg); backdrop-filter: saturate(160%) blur(14px); -webkit-backdrop-filter: saturate(160%) blur(14px); border-bottom: 1px solid var(--line); }
.top-in { max-width: 1320px; margin-inline: auto; padding-inline: clamp(14px, 3vw, 28px); height: var(--top-h); display: flex; align-items: center; gap: 18px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; flex: none; }
.brand-text { display: flex; align-items: baseline; gap: 8px; white-space: nowrap; }
.brand-text b { font-weight: 750; letter-spacing: -.02em; font-size: .98rem; }
.brand-text i { font: 600 .68rem var(--mono); font-style: normal; text-transform: uppercase; letter-spacing: .14em; color: var(--accent); border: 1px solid currentColor; border-radius: 5px; padding: 1px 6px; }
.nav { display: flex; gap: 2px; margin-left: auto; }
.nav a { color: var(--muted); text-decoration: none; font-size: .88rem; font-weight: 550; padding: 7px 9px; border-radius: 8px; white-space: nowrap; }
.nav a:hover { color: var(--text); background: var(--surface-2); }
.nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); box-shadow: inset 0 -2px 0 var(--accent); }
.top-tools { display: flex; gap: 4px; flex: none; }
.icon-btn { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 9px; border: 1px solid transparent; background: none; color: var(--muted); cursor: pointer; }
.icon-btn:hover { color: var(--text); background: var(--surface-2); border-color: var(--line); }
.nav-toggle { display: none; margin-left: auto; font: 600 .86rem var(--sans); color: var(--text); background: var(--surface-2); border: 1px solid var(--line); border-radius: 9px; padding: 8px 14px; cursor: pointer; }

@media (max-width: 1230px) {
  .nav-toggle { display: block; }
  .nav { display: none; position: absolute; top: var(--top-h); left: 0; right: 0; flex-direction: column; gap: 0; margin: 0; padding: 10px clamp(14px, 3vw, 28px) 16px; background: var(--bg); border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
  .nav.open { display: flex; }
  .nav a { padding: 12px 12px; font-size: 1rem; }
  .nav a[aria-current="page"] { box-shadow: inset 3px 0 0 var(--accent); }
}
.brand { min-width: 0; }
.brand-text { min-width: 0; }
.brand-text b { overflow: hidden; text-overflow: ellipsis; }
@media (max-width: 520px) {
  .top-in { gap: 10px; }
  .brand-text b { font-size: .86rem; }
  .brand-text i { display: none; }
  .top-tools a.icon-btn { display: none; }      /* the GitHub link is also in the footer */
  .nav-toggle { padding: 8px 11px; }
}

/* ---------------------------------------------------------------- buttons, chips */
.btn { display: inline-flex; align-items: center; gap: 8px; font: 600 .92rem/1 var(--sans); color: var(--text); text-decoration: none; background: var(--surface); border: 1px solid var(--line-strong); border-radius: 10px; padding: 11px 16px; cursor: pointer; transition: transform .12s, border-color .12s, background .12s; }
.btn:hover { border-color: var(--muted); transform: translateY(-1px); }
.btn-primary { background: var(--btn-bg); border-color: var(--btn-bg); color: var(--btn-ink); }
.btn-primary:hover { border-color: var(--btn-bg); opacity: .88; }
.btn-lg { padding: 14px 22px; font-size: 1rem; border-radius: 12px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; }
.tag { display: inline-block; font: 600 .7rem/1.5 var(--mono); letter-spacing: .08em; text-transform: uppercase; padding: 2px 9px; border-radius: 999px; border: 1px solid var(--line-strong); color: var(--muted); white-space: nowrap; }
.tag.gpu { color: var(--accent); border-color: currentColor; background: var(--accent-soft); }
.tag.cpu { color: var(--accent-2); border-color: currentColor; background: var(--accent-2-soft); }
.tag.smp { color: var(--violet); border-color: currentColor; background: var(--violet-soft); }
.tag.ok { color: var(--green); border-color: currentColor; background: var(--green-soft); }
.meta-row { display: flex; flex-wrap: wrap; gap: 6px 8px; margin: .2rem 0 .9rem; }
.meta-row span { font: 500 .78rem var(--mono); color: var(--muted); background: var(--surface-2); border: 1px solid var(--line); border-radius: 6px; padding: 2px 8px; }
.chip-list { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 0 0 1.1rem; }
.chip-list li { font-size: .82rem; color: var(--muted); border: 1px dashed var(--line-strong); border-radius: 999px; padding: 2px 11px; }

/* ---------------------------------------------------------------- home: hero */
.hero { border-bottom: 1px solid var(--line); }
.hero-in { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 70px); align-items: center; padding-block: clamp(48px, 8vw, 104px) clamp(44px, 6vw, 84px); }
.hero h1 { font-size: clamp(2.4rem, 4.9vw, 4rem); font-weight: 820; letter-spacing: -.04em; line-height: 1.02; }
.hero h1 em { font-style: normal; color: var(--accent-big); }
.hero .lead { font-size: clamp(1.05rem, 1.5vw, 1.24rem); color: var(--muted); max-width: 34em; margin: 1.3rem 0 1.9rem; }
.hero-note { margin: 1.4rem 0 0; font-size: .86rem; color: var(--faint); }
@media (max-width: 940px) { .hero-in { grid-template-columns: 1fr; } }

/* the black box in the hero */
.bb { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 22px; box-shadow: var(--shadow); }
.bb-row { display: grid; grid-template-columns: max-content 18px 164px 18px minmax(0, 1fr); gap: 10px; align-items: center; }
.bb-label { font: 600 .66rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--faint); margin: 0 0 10px; }
.bb-chips { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.bb-chips span { font: 500 .84rem var(--mono); padding: 4px 10px; border-radius: 7px; border: 1px solid var(--line-strong); background: var(--surface-2); animation: chip-in .5s both; }
.bb-chips span:nth-child(2) { animation-delay: .08s; } .bb-chips span:nth-child(3) { animation-delay: .16s; }
.bb-chips span:nth-child(4) { animation-delay: .24s; } .bb-chips span:nth-child(5) { animation-delay: .32s; }
@keyframes chip-in { from { opacity: 0; transform: translateX(-10px); } }
.bb-arrow { color: var(--faint); font: 1.2rem var(--mono); text-align: center; }
.bb-box { position: relative; aspect-ratio: 1; perspective: 700px; }
.bb-inside { position: absolute; inset: 0; border-radius: 16px; border: 1px solid rgba(96, 165, 250, .6); background: radial-gradient(120% 90% at 50% 0%, rgba(59, 130, 246, .36), rgba(59, 130, 246, .06) 60%), #0a1124; display: flex; flex-direction: column; justify-content: center; gap: 6px; padding: 12px; box-shadow: 0 0 46px -6px rgba(59, 130, 246, .55); }
.bb-layer { font: 600 .68rem/1.25 var(--mono); color: #dbeafe; text-align: center; padding: 6px 4px; border-radius: 7px; border: 1px solid rgba(96, 165, 250, .45); background: rgba(59, 130, 246, .14); }
.bb-layer.block { border-style: dashed; display: grid; gap: 5px; padding: 6px; }
.bb-layer.block i { font-style: normal; font-size: .6rem; color: #93c5fd; letter-spacing: .1em; }
.bb-layer.block span { display: block; padding: 5px 3px; border-radius: 5px; background: rgba(59, 130, 246, .26); }
.bb-shell { position: absolute; inset: 0; border-radius: 16px; border: 1px solid #33415f; background: linear-gradient(150deg, #1c2742, #05070d 70%); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .1), 0 18px 34px -14px #000; display: grid; place-items: center; text-align: center; color: #c9cfdd; transform-origin: 50% 0; transition: transform .7s cubic-bezier(.2, .8, .2, 1), opacity .5s; }
.bb-shell b { display: block; font: 800 3.1rem/1 var(--sans); color: #fff; }
.bb-shell small { font: 600 .66rem var(--mono); letter-spacing: .16em; text-transform: uppercase; color: #8e97ad; }
.bb-shell::after { content: ""; position: absolute; left: 14%; right: 14%; bottom: -1px; height: 2px; background: #60a5fa; filter: blur(1px); opacity: .9; animation: seam 2.6s ease-in-out infinite; }
@keyframes seam { 50% { opacity: .25; } }
.bb[data-open="true"] .bb-shell { transform: rotateX(-74deg) translateY(-6px); opacity: 0; pointer-events: none; }
.bb-bars { display: grid; gap: 7px; }
.bb-bar { display: grid; grid-template-columns: 4.7em minmax(0, 1fr) 2.4em; gap: 8px; align-items: center; font: 500 .8rem var(--mono); }
.bb-bar i { display: block; height: 9px; border-radius: 5px; background: var(--surface-2); overflow: hidden; }
.bb-bar i::after { content: ""; display: block; height: 100%; width: calc(var(--p) * 100%); border-radius: 5px; background: linear-gradient(90deg, var(--accent-fill), #60a5fa); transform-origin: 0 50%; animation: grow 1s .35s both cubic-bezier(.2, .8, .2, 1); }
@keyframes grow { from { transform: scaleX(0); } }
.bb-bar b { font-weight: 500; color: var(--muted); text-align: right; }
.bb-foot { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; justify-content: space-between; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.bb-foot p { margin: 0; font-size: .8rem; color: var(--faint); max-width: 30em; }
@media (max-width: 560px) {
  .bb-row { grid-template-columns: 1fr; justify-items: center; }
  .bb-arrow { transform: rotate(90deg); }
  .bb-box { width: 176px; }
  .bb-chips { flex-direction: row; flex-wrap: wrap; justify-content: center; }
  .bb-col { width: 100%; } .bb-label { text-align: center; }
}

/* ---------------------------------------------------------------- home: sections */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-bottom: 1px solid var(--line); background: var(--bg-soft); }
.stats div { padding: 26px clamp(14px, 3vw, 34px); border-left: 1px solid var(--line); }
.stats div:first-child { border-left: 0; }
.stats b { display: block; font: 800 clamp(1.7rem, 3.4vw, 2.5rem)/1 var(--sans); letter-spacing: -.03em; }
.stats span { font-size: .88rem; color: var(--muted); }
@media (max-width: 700px) { .stats { grid-template-columns: repeat(2, 1fr); } .stats div:nth-child(3) { border-left: 0; } .stats div:nth-child(n+3) { border-top: 1px solid var(--line); } }

.section { padding-block: clamp(54px, 8vw, 96px); }
.section + .section { border-top: 1px solid var(--line); }
.section.alt { background: var(--bg-soft); }
.section-head { max-width: 46em; margin-bottom: 2.4rem; }
.section-head h2 { font-size: clamp(1.7rem, 3.2vw, 2.5rem); font-weight: 800; letter-spacing: -.03em; }
.section-head p:not(.eyebrow) { color: var(--muted); font-size: 1.06rem; margin: .9rem 0 0; }

.grid { display: grid; gap: 18px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 900px) { .grid.three { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 660px) { .grid.two, .grid.three { grid-template-columns: 1fr; } }

.card { position: relative; display: block; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; color: inherit; text-decoration: none; }
a.card { transition: transform .15s, border-color .15s, box-shadow .15s; }
a.card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow); }
.card h3 { font-size: 1.18rem; font-weight: 720; margin-bottom: .5rem; }
.card p { color: var(--muted); margin: 0; font-size: .96rem; }
.card .eyebrow { margin-bottom: .7rem; }
.card ul { margin: .9rem 0 0; padding-left: 1.1em; color: var(--muted); font-size: .95rem; }
.card li { margin: .2rem 0; }
.card.part { padding: 30px; overflow: hidden; }
.card.part::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 3px; background: var(--c, var(--accent)); }
.card.part h3 { font-size: 1.5rem; letter-spacing: -.025em; }
.card.part .eyebrow { color: var(--c, var(--accent)); }
.card .more { display: inline-block; margin-top: 1.1rem; font-weight: 600; font-size: .93rem; color: var(--c, var(--accent)); }
.c-sky { --c: var(--accent-2); } .c-blue { --c: var(--accent); } .c-violet { --c: var(--violet); } .c-green { --c: var(--green); }

.path { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.path li { counter-increment: step; }
.path a { display: block; height: 100%; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 22px 20px; color: inherit; text-decoration: none; transition: transform .15s, border-color .15s; }
.path a:hover { transform: translateY(-3px); border-color: var(--accent); }
.path a::before { content: counter(step, decimal-leading-zero); display: block; font: 700 .8rem var(--mono); color: var(--accent); letter-spacing: .1em; margin-bottom: .8rem; }
.path h3 { font-size: 1.1rem; margin-bottom: .4rem; }
.path p { margin: 0; color: var(--muted); font-size: .93rem; }
.path small { display: block; margin-top: .8rem; font: 500 .76rem var(--mono); color: var(--faint); }
@media (max-width: 900px) { .path { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .path { grid-template-columns: 1fr; } }

/* tabs */
.tabs { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); overflow: hidden; }
.tab-list { display: flex; gap: 2px; padding: 8px; border-bottom: 1px solid var(--line); background: var(--surface-2); overflow-x: auto; }
.tab-list button { font: 600 .9rem var(--sans); color: var(--muted); background: none; border: 0; border-radius: 8px; padding: 9px 15px; cursor: pointer; white-space: nowrap; }
.tab-list button:hover { color: var(--text); }
.tab-list button[aria-selected="true"] { color: var(--btn-ink); background: var(--btn-bg); }
.tab-panel { padding: 22px; }
.tab-panel[hidden] { display: none; }
.tab-panel > :last-child { margin-bottom: 0; }
.tab-panel p { color: var(--muted); }

.tree { font: .88rem/1.75 var(--mono); background: var(--code-bg); color: var(--code-text); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; overflow-x: auto; margin: 0; }
.tree a { color: var(--code-text); text-decoration-color: var(--line-strong); }
.tree a:hover { color: var(--accent); }
.tree span { color: var(--faint); }

/* ---------------------------------------------------------------- inner pages */
.page-hero { border-bottom: 1px solid var(--line); padding-block: clamp(40px, 6vw, 76px) clamp(30px, 4vw, 52px); }
.page-hero h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); font-weight: 820; letter-spacing: -.035em; max-width: 18em; }
.page-hero .lead { font-size: clamp(1.02rem, 1.4vw, 1.18rem); color: var(--muted); max-width: 44em; margin: 1rem 0 0; }
.page-hero .lead:empty, .page-hero .eyebrow:empty { display: none; }

.layout { padding-block: clamp(32px, 5vw, 56px) clamp(40px, 6vw, 72px); }
.layout.has-toc { display: grid; grid-template-columns: minmax(0, 1fr) 216px; gap: clamp(28px, 4.5vw, 64px); align-items: start; }
.toc { position: sticky; top: calc(var(--top-h) + 26px); max-height: calc(100vh - var(--top-h) - 52px); overflow-y: auto; font-size: .86rem; }
.toc p { font: 600 .7rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--faint); margin: 0 0 .7rem; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.toc a { display: block; padding: 5px 0 5px 14px; margin-left: -1px; border-left: 2px solid transparent; color: var(--muted); text-decoration: none; line-height: 1.35; }
.toc a:hover { color: var(--text); }
.toc a.active { color: var(--accent); border-left-color: var(--accent); }
@media (max-width: 1000px) { .layout.has-toc { grid-template-columns: minmax(0, 1fr); } .toc { display: none; } }

.prose { min-width: 0; max-width: 860px; }
.layout:not(.has-toc) .prose { margin-inline: auto; }
.prose > :first-child { margin-top: 0; }
.prose h2 { font-size: clamp(1.45rem, 2.4vw, 1.9rem); font-weight: 790; letter-spacing: -.028em; margin: 3.2rem 0 1rem; padding-top: .4rem; }
.prose h3 { font-size: 1.2rem; font-weight: 720; margin: 2.1rem 0 .7rem; }
.prose h4 { font-size: 1rem; font-weight: 700; margin: 1.5rem 0 .5rem; }
.prose .card h3 { margin: 0 0 .5rem; }
.prose .card.part h3 { margin-bottom: .6rem; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.1em; }
.prose li { margin: .3rem 0; }
.prose .ex-nav, .prose .steps, .prose .pipeline, .prose .chip-list, .prose .merge-list { padding-left: 0; }
.prose .chip-list li, .prose .merge-list li { margin: 0; }
.prose li::marker { color: var(--faint); }
.prose strong { font-weight: 680; }
.prose :not(pre) > code { font-size: .88em; background: var(--surface-2); border: 1px solid var(--line); border-radius: 6px; padding: .08em .38em; overflow-wrap: anywhere; }
.prose kbd { font-size: .82em; background: var(--surface-2); border: 1px solid var(--line-strong); border-bottom-width: 2px; border-radius: 6px; padding: .05em .45em; }
.anchor { margin-left: .4em; color: var(--line-strong); text-decoration: none; font-weight: 400; opacity: 0; }
h2:hover .anchor, .anchor:focus { opacity: 1; }
.back { margin: 0 0 1.4rem; font-size: .92rem; }
.back a::before { content: "← "; }
.lede { font-size: 1.1rem; color: var(--muted); }
.small { font-size: .88rem; color: var(--muted); }

.table-wrap { overflow-x: auto; margin: 0 0 1.4em; border: 1px solid var(--line); border-radius: var(--radius-sm); }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font: 600 .72rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--faint); background: var(--surface-2); white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }
td.wrap-code code { white-space: normal; }
.num { text-align: right; font-variant-numeric: tabular-nums; }

.callout { border: 1px solid var(--line); border-left: 3px solid var(--c, var(--accent-2)); background: var(--surface); border-radius: var(--radius-sm); padding: 15px 18px; margin: 1.4rem 0; font-size: .96rem; }
.callout > :last-child { margin-bottom: 0; }
.callout strong:first-child { color: var(--c, var(--accent-2)); }
.callout.tip { --c: var(--green); } .callout.warn { --c: var(--red); } .callout.note { --c: var(--accent-2); } .callout.try { --c: var(--violet); }

.steps { list-style: none; counter-reset: s; padding: 0; margin: 2rem 0; }
.steps > li { counter-increment: s; position: relative; padding: 0 0 2rem 58px; margin: 0; }
.steps > li::before { content: counter(s); position: absolute; left: 0; top: -2px; width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; font: 700 .95rem var(--mono); color: var(--accent-ink); background: var(--accent-fill); }
.steps > li::after { content: ""; position: absolute; left: 18.5px; top: 44px; bottom: 6px; width: 1px; background: var(--line-strong); }
.steps > li:last-child::after { display: none; }
.steps > li > h3 { margin: 0 0 .6rem; padding-top: .3rem; font-size: 1.22rem; }
@media (max-width: 560px) { .steps > li { padding-left: 0; padding-top: 50px; } .steps > li::after { display: none; } }

/* ---------------------------------------------------------------- code */
.code { margin: 1.2rem 0 1.5rem; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--code-bg); overflow: hidden; }
.code figcaption { display: flex; align-items: center; gap: 10px; min-height: 38px; padding: 5px 6px 5px 14px; border-bottom: 1px solid var(--line); background: var(--surface-2); font: 500 .76rem var(--mono); color: var(--muted); }
.code-title { color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.code-lang { color: var(--faint); text-transform: uppercase; letter-spacing: .1em; font-size: .66rem; white-space: nowrap; }
.code-link { margin-left: auto; color: var(--muted); }
.copy { margin-left: auto; font: 600 .72rem var(--mono); color: var(--muted); background: var(--surface); border: 1px solid var(--line-strong); border-radius: 7px; padding: 5px 11px; cursor: pointer; }
.code-link + .copy { margin-left: 0; }
.copy:hover { color: var(--text); border-color: var(--muted); }
.copy.done { color: var(--green); border-color: var(--green); }
.code pre { margin: 0; padding: 15px 16px; overflow-x: auto; font-size: .835rem; line-height: 1.62; color: var(--code-text); tab-size: 4; }
.code.output pre { color: var(--muted); }
.code.output { border-style: dashed; }
details.file { margin: 1rem 0; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); }
details.file > summary { list-style: none; display: flex; align-items: center; gap: 12px; padding: 12px 16px; cursor: pointer; font: 600 .9rem var(--mono); }
details.file > summary::-webkit-details-marker { display: none; }
details.file > summary::before { content: "+"; display: grid; place-items: center; width: 22px; height: 22px; border-radius: 6px; background: var(--surface-2); border: 1px solid var(--line-strong); color: var(--accent); font-weight: 700; flex: none; }
details.file[open] > summary::before { content: "−"; }
details.file > summary:hover { color: var(--accent); }
.file-meta { margin-left: auto; font-weight: 500; font-size: .76rem; color: var(--faint); }
details.file .code { margin: 0; border: 0; border-top: 1px solid var(--line); border-radius: 0 0 var(--radius-sm) var(--radius-sm); }
details.file .code pre { max-height: 560px; }

/* syntax colours (Pygments class names) */
.hl .c, .hl .c1, .hl .cm, .hl .ch, .hl .sd { color: var(--faint); font-style: italic; }
.hl .k, .hl .kn, .hl .kd, .hl .kr, .hl .kc, .hl .ow { color: var(--violet); }
.hl .s, .hl .s1, .hl .s2, .hl .sa, .hl .se, .hl .si, .hl .sh, .hl .sb { color: var(--green); }
.hl .mi, .hl .mf, .hl .mh, .hl .il { color: var(--code-num); }
.hl .nf, .hl .fm, .hl .nc, .hl .nd { color: var(--accent-2); }
.hl .nb, .hl .bp { color: var(--accent-2); }
.hl .nv, .hl .vm { color: var(--code-num); }
.hl .o, .hl .p { color: var(--muted); }
.hl .sbd { color: var(--accent); font-weight: 700; font-style: normal; }
.hl .sbk { color: var(--accent-2); } .hl .sbv { color: var(--green); }
.hl .zih { color: var(--accent); border-bottom: 1px dashed currentColor; }

/* ---------------------------------------------------------------- clusters */
.arch { display: grid; grid-template-columns: minmax(0, .8fr) 34px minmax(0, 1fr) 34px minmax(0, 1fr) 34px minmax(0, 1.2fr); gap: 0; align-items: stretch; margin: 1.8rem 0 .6rem; }
.arch-box { background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius-sm); padding: 14px; font-size: .86rem; }
.arch-box b { display: block; font-size: .96rem; margin-bottom: .25rem; }
.arch-box span { color: var(--muted); display: block; line-height: 1.45; }
.arch-box.hot { border-color: var(--accent); background: linear-gradient(180deg, var(--accent-soft), transparent), var(--surface); }
.arch-arrow { display: grid; place-items: center; color: var(--faint); font: 1.1rem var(--mono); }
.arch-store { margin: 12px 0 0 calc(22.5% + 0px); background: var(--surface); border: 1px dashed var(--line-strong); border-radius: var(--radius-sm); padding: 12px 14px; font-size: .86rem; color: var(--muted); }
.arch-store b { color: var(--text); }
@media (max-width: 860px) { .arch { grid-template-columns: 1fr; } .arch-arrow { transform: rotate(90deg); padding: 4px 0; } .arch-store { margin-left: 0; } }

.clusters { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin: 1.6rem 0; }
@media (max-width: 720px) { .clusters { grid-template-columns: 1fr; } }
.cluster { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; }
.cluster.used { border-color: var(--line-strong); box-shadow: inset 0 3px 0 var(--c, var(--accent)); }
.cluster header { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: .2rem; }
.cluster h3 { font-size: 1.36rem; margin: 0 4px 0 0; letter-spacing: -.025em; }
.cluster .what { color: var(--muted); font-size: .93rem; margin: .5rem 0 1rem; }
.cluster dl { display: grid; grid-template-columns: auto 1fr; gap: 5px 14px; margin: 0 0 1rem; font-size: .9rem; }
.cluster dt { color: var(--faint); font: 500 .74rem/1.9 var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.cluster dd { margin: 0; }
.cluster .host { margin-top: auto; font: 500 .78rem var(--mono); color: var(--muted); background: var(--code-bg); border: 1px solid var(--line); border-radius: 7px; padding: 8px 10px; overflow-wrap: anywhere; }
.node { display: flex; gap: 4px; margin: 0 0 1rem; flex-wrap: wrap; align-items: center; }
.node i { width: 26px; height: 18px; border-radius: 4px; background: var(--accent-fill); opacity: .92; display: block; }
.node.cpu i { width: 9px; height: 18px; background: var(--accent-2-fill); border-radius: 2px; }
.node small { font: 500 .72rem var(--mono); color: var(--faint); margin-left: 6px; }

/* ---------------------------------------------------------------- lab exercises */
.ex-nav { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 10px; margin: 1.6rem 0 0; padding: 0; list-style: none; }
.ex-nav li { margin: 0; }
.ex-nav a { display: flex; gap: 12px; align-items: center; padding: 12px 14px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); color: inherit; text-decoration: none; font-size: .92rem; font-weight: 600; }
.ex-nav a:hover { border-color: var(--accent); }
.ex-nav b { font: 700 .82rem var(--mono); color: var(--accent-ink); background: var(--accent-fill); border-radius: 6px; padding: 3px 7px; }
.ex { margin: 3.4rem 0 0; padding-top: 2.2rem; border-top: 1px solid var(--line); }
.ex-head { display: flex; gap: 16px; align-items: flex-start; }
.ex-num { flex: none; width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center; font: 800 1.3rem var(--mono); color: var(--accent-ink); background: var(--accent-fill); }
.ex-head h2 { margin: 0 0 .5rem; padding: 0; }
.ex-head .meta-row { margin: 0; }
.ex > p:first-of-type { margin-top: 1.2rem; }
@media (max-width: 520px) { .ex-head { flex-direction: column; gap: 10px; } }

/* ---------------------------------------------------------------- the running example */
.avatar { width: 64px; height: 64px; border-radius: 50%; display: grid; place-items: center; flex: none; font-style: normal; color: #fff; background: var(--accent-fill); }
.avatar svg { width: 52%; height: 52%; }
.avatar.b { background: var(--accent-2-fill); color: #06283d; }
.who { display: inline-flex; align-items: center; gap: 9px; }
.who .avatar { width: 32px; height: 32px; }
.who b { font-size: 1rem; font-weight: 720; }
.cast { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin: 1.6rem 0; }
.person { display: flex; gap: 18px; align-items: flex-start; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.person h3, .prose .person h3 { margin: 0 0 .3rem; font-size: 1.3rem; letter-spacing: -.02em; }
.person p { margin: 0; color: var(--muted); font-size: .95rem; }
.person .trait { font: 600 .7rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin-bottom: .35rem; }
@media (max-width: 700px) { .cast { grid-template-columns: 1fr; } }
.quote { font-size: clamp(1.25rem, 2.4vw, 1.7rem); font-weight: 720; letter-spacing: -.02em; line-height: 1.3; border-left: 4px solid var(--accent-fill); padding: .2rem 0 .2rem 1.1rem; margin: 1.4rem 0; }
.verdict { display: inline-block; font: 700 .66rem/1.6 var(--mono); letter-spacing: .1em; text-transform: uppercase; border: 1px solid currentColor; border-radius: 999px; padding: 1px 10px; white-space: nowrap; }
.verdict.bad { color: var(--red); background: var(--red-soft); }
.verdict.good { color: var(--green); background: var(--green-soft); }
.legend { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; font-size: .9rem; color: var(--muted); margin: 1.4rem 0 0; }
.legend .verdict.good { margin-left: 10px; }
.duel { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 1.3rem 0; align-items: start; }
@media (max-width: 860px) { .duel { grid-template-columns: 1fr; } }
.take { background: var(--surface); border: 1px solid var(--line); border-top: 3px solid var(--c); border-radius: var(--radius); min-width: 0; }
.take.bad { --c: var(--red); } .take.good { --c: var(--green); }
.take-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 14px 16px 0; }
.take-body { padding: 10px 16px 16px; font-size: .94rem; }
.take-body > :first-child { margin-top: 0; } .take-body > :last-child { margin-bottom: 0; }
.take-body p { margin: 0 0 .7em; }
.take .code { margin: .7rem 0 .9rem; }
.lesson { display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: baseline; border: 1px solid var(--accent); background: var(--accent-soft); border-radius: var(--radius-sm); padding: 14px 18px; margin: 1.3rem 0 0; font-weight: 600; }
.lesson > span { font: 700 .68rem var(--mono); letter-spacing: .13em; text-transform: uppercase; color: var(--accent); white-space: nowrap; }
.term pre { white-space: pre-wrap; overflow-wrap: anywhere; font-size: .8rem; }
.t-pr { color: var(--accent); font-weight: 700; user-select: none; }
.t-cmd { color: var(--code-text); font-weight: 650; }
.t-out { color: var(--muted); }
.t-err { color: var(--red); font-weight: 650; }
.t-note { color: var(--faint); font-style: italic; }
.story-strip { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; border: 1px dashed var(--line-strong); border-radius: var(--radius-sm); padding: 10px 14px; margin: 1.2rem 0; font-size: .93rem; background: var(--bg-soft); }
.story-strip .duo { display: inline-flex; flex: none; }
.story-strip .duo .avatar { width: 28px; height: 28px; border: 2px solid var(--bg-soft); }
.story-strip .duo .avatar + .avatar { margin-left: -9px; }
.story-strip p { margin: 0; flex: 1 1 18em; }
.story-home { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: clamp(24px, 4vw, 56px); align-items: center; }
.story-home .cast { grid-template-columns: 1fr; margin: 0; }
@media (max-width: 860px) { .story-home { grid-template-columns: 1fr; } }

/* ---------------------------------------------------------------- notebooks */
.nb-cards { display: grid; gap: 18px; margin: 1.6rem 0; }
.nb-card { display: grid; grid-template-columns: 76px minmax(0, 1fr); gap: 22px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.nb-card-num { width: 76px; height: 76px; border-radius: 18px; display: grid; place-items: center; font: 800 1.9rem var(--mono); color: var(--accent); background: var(--accent-soft); border: 1px solid var(--accent); }
.nb-card h3 { font-size: 1.36rem; margin: 0 0 .4rem; letter-spacing: -.025em; }
.nb-card h3 a { color: inherit; text-decoration: none; }
.nb-card h3 a:hover { color: var(--accent); }
.nb-card p { color: var(--muted); margin: 0 0 .7rem; }
@media (max-width: 600px) { .nb-card { grid-template-columns: 1fr; gap: 14px; } .nb-card-num { width: 56px; height: 56px; font-size: 1.4rem; border-radius: 13px; } }

.nb-actions { margin: 0 0 1.6rem; }
.nb + .nb-actions { margin: 2.4rem 0 0; padding-top: 1.6rem; border-top: 1px solid var(--line); }
.nb-md > :first-child { margin-top: 0; }
.nb-md h2 { margin-top: 2.8rem; }
.nb-cell { margin: 1.3rem 0 1.7rem; }
.nb-cell .code { margin: 0; }
.nb-out { position: relative; margin: 0 0 0 14px; border: 1px solid var(--line); border-top: 0; border-radius: 0 0 var(--radius-sm) var(--radius-sm); background: var(--surface); padding: 30px 14px 12px; }
.nb-out-label { position: absolute; top: 9px; left: 14px; font: 600 .62rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--faint); }
.nb-stream { margin: 0; font-size: .8rem; line-height: 1.55; color: var(--muted); overflow: auto; max-height: 420px; white-space: pre; }
.nb-error { color: var(--red); }
.nb-fig { background: #fff; border-radius: 8px; padding: 8px; margin: 8px 0 2px; overflow-x: auto; }
.nb-fig img { display: block; height: auto; margin: 0 auto; }

/* ---------------------------------------------------------------- slides */
.deck { margin: 0 0 3rem; }
.deck-head h2 { margin-top: 0; }
.deck-view { width: 100%; height: min(78vh, 760px); border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); margin-top: 1.2rem; }

/* ---------------------------------------------------------------- widgets */
.widget { margin: 1.8rem 0; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--surface); overflow: hidden; }
.widget-head { display: flex; align-items: center; gap: 10px; padding: 12px 18px; border-bottom: 1px solid var(--line); background: var(--surface-2); }
.widget-head b { font-size: .98rem; }
.widget-head span { margin-left: auto; font: 600 .64rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); border: 1px solid currentColor; border-radius: 999px; padding: 2px 9px; }
.widget-body { padding: 18px; }
.widget-body > :last-child { margin-bottom: 0; }
.widget p.hint { font-size: .86rem; color: var(--muted); margin: .8rem 0 0; }
.w-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 20px; align-items: start; }
@media (max-width: 720px) { .w-grid { grid-template-columns: 1fr; } }
.w-plot { width: 100%; height: auto; display: block; background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius-sm); touch-action: none; }
.w-plot text { font: 11px var(--mono); fill: var(--faint); }
.ctl { display: grid; grid-template-columns: 7.2em minmax(0, 1fr) 3.6em; gap: 10px; align-items: center; margin: 0 0 10px; font-size: .88rem; }
.ctl label { color: var(--muted); }
.ctl output { font: 600 .84rem var(--mono); text-align: right; }
input[type="range"] { width: 100%; accent-color: var(--accent-fill); }
.field { display: grid; gap: 5px; font-size: .86rem; color: var(--muted); }
.field input, .field select, .field textarea, .zih-input { font: 500 .9rem var(--mono); color: var(--text); background: var(--code-bg); border: 1px solid var(--line-strong); border-radius: 8px; padding: 9px 11px; width: 100%; }
.field textarea { resize: vertical; min-height: 74px; line-height: 1.5; }
.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.fields .wide { grid-column: 1 / -1; }
.check { display: flex; gap: 9px; align-items: center; font-size: .88rem; color: var(--muted); }
.check input { accent-color: var(--accent-fill); width: 16px; height: 16px; }
.readout { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 0; }
.readout span { font: 500 .8rem var(--mono); color: var(--muted); background: var(--surface-2); border: 1px solid var(--line); border-radius: 7px; padding: 4px 9px; }
.readout b { color: var(--text); font-weight: 650; }
.tok-out { display: flex; flex-wrap: wrap; gap: 4px; padding: 12px; min-height: 60px; background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius-sm); font: 500 .86rem/1.5 var(--mono); }
.tok { padding: 1px 6px; border-radius: 5px; white-space: pre; background: hsl(var(--h) 70% 50% / .2); border: 1px solid hsl(var(--h) 70% 55% / .55); }
.tok.raw { font-size: .72rem; opacity: .85; }
.merge-list { margin: 12px 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 5px; font: 500 .76rem var(--mono); color: var(--muted); }
.merge-list li { margin: 0; padding: 2px 7px; border: 1px solid var(--line); border-radius: 6px; white-space: pre; }
.bars { display: grid; gap: 6px; }
.bar { display: grid; grid-template-columns: 6em minmax(0, 1fr) 3.6em 2.6em; gap: 8px; align-items: center; font: 500 .82rem var(--mono); }
.bar i { display: block; height: 14px; border-radius: 4px; background: var(--surface-2); overflow: hidden; }
.bar i::after { content: ""; display: block; height: 100%; width: calc(var(--p) * 100%); background: var(--accent-fill); border-radius: 4px; transition: width .18s; }
.bar.wrong > span { color: var(--red); } .bar.wrong i::after { background: var(--red); }
.bar.cut { opacity: .38; } .bar.cut i::after { background: var(--faint); }
.bar b { font-weight: 500; text-align: right; color: var(--muted); }
.bar em { font-style: normal; text-align: right; color: var(--accent); font-size: .74rem; }
.sampled { margin: 12px 0 0; padding: 11px 13px; min-height: 46px; background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius-sm); font: 500 .88rem/1.6 var(--mono); }
.sampled span { color: var(--accent); }
.mask { display: grid; gap: 3px; font: 600 .74rem var(--mono); margin: 0 0 4px; overflow-x: auto; }
.mask div { display: grid; grid-template-columns: 4.8em repeat(var(--n), minmax(58px, 1fr)); gap: 3px; align-items: center; }
.mask span { text-align: center; color: var(--muted); padding: 3px 0; white-space: pre; }
.mask span:first-child { text-align: right; padding-right: 8px; }
.mask i { display: block; height: 30px; border-radius: 5px; background: var(--surface-2); border: 1px solid var(--line); font-style: normal; display: grid; place-items: center; color: var(--faint); }
.mask i.on { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.mask div.sel i.on { background: var(--accent-fill); color: var(--accent-ink); }
.mask div.sel span:first-child { color: var(--accent); }
.mask button { all: unset; cursor: pointer; display: contents; }
.w-warn { color: var(--red); font-size: .86rem; margin: 10px 0 0; }
.w-warn:empty { display: none; }

.zih-box { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin: 1.4rem 0; padding: 14px 18px; border: 1px dashed var(--accent); border-radius: var(--radius-sm); background: var(--accent-soft); font-size: .93rem; }
.zih-box label { font-weight: 650; }
.zih-input { width: 11.5em; }
.zih-box small { color: var(--muted); flex-basis: 100%; }

.compare { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin: 1.6rem 0; }
@media (max-width: 700px) { .compare { grid-template-columns: 1fr; } }
.compare .card h3 { display: flex; align-items: center; gap: 10px; }
.swatch { width: 18px; height: 18px; border-radius: 5px; flex: none; border: 1px solid var(--line-strong); }
.swatch.black { background: #06070a; } .swatch.glass { background: var(--accent-soft); border-color: var(--accent); }
.pipeline { list-style: none; margin: 1.6rem 0; padding: 0; display: grid; gap: 0; }
.pipeline li { position: relative; margin: 0; padding: 14px 16px 14px 62px; border: 1px solid var(--line); border-bottom: 0; background: var(--surface); }
.pipeline li:first-child { border-radius: var(--radius-sm) var(--radius-sm) 0 0; }
.pipeline li:last-child { border-bottom: 1px solid var(--line); border-radius: 0 0 var(--radius-sm) var(--radius-sm); }
.pipeline li::before { content: attr(data-n); position: absolute; left: 16px; top: 15px; width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center; font: 700 .8rem var(--mono); color: var(--accent); background: var(--accent-soft); border: 1px solid var(--accent); }
.pipeline b { display: block; }
.pipeline span { color: var(--muted); font-size: .93rem; }

/* ---------------------------------------------------------------- math */
math.tm { font-family: "STIX Two Math", "Cambria Math", "Latin Modern Math", "Noto Sans Math", math; font-size: 1.08em; }
.math-block { display: block; overflow-x: auto; overflow-y: hidden; padding: .7rem 0; margin: .3rem 0 .9rem; }
.math-block math.tm { font-size: 1.16em; }
.tm-bf { font-weight: 700; }
mtd.tm-left { text-align: left; padding: .15em .5em; }

/* ---------------------------------------------------------------- pager, footer */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding-bottom: clamp(40px, 6vw, 72px); }
.pager a { display: block; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 22px; background: var(--surface); color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.06rem; }
.pager a:hover { border-color: var(--accent); }
.pager a span { display: block; font: 600 .68rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--faint); margin-bottom: 4px; }
.pager-next { text-align: right; }
.foot { border-top: 1px solid var(--line); background: var(--bg-soft); padding-block: 46px 54px; font-size: .92rem; color: var(--muted); }
.foot-in { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1fr); gap: 36px; }
.foot-title { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 750; font-size: 1.02rem; }
.foot-small { font-size: .82rem; color: var(--faint); }
.foot-head { font: 600 .7rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--faint); margin-bottom: .7rem; }
.foot a { display: block; color: var(--muted); text-decoration: none; padding: 3px 0; }
.foot a:hover { color: var(--accent); }
.foot code { font-size: .86em; }
@media (max-width: 760px) { .foot-in { grid-template-columns: 1fr; gap: 26px; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
@media print {
  .top, .toc, .pager, .foot, .copy, .nav-toggle { display: none !important; }
  body { background: #fff; color: #000; }
  details.file .code pre { max-height: none; }
}