/* JAX and PyTorch explainer.
   The first part is a copy of the Visual Learn house style (base.css); it is
   copied, never imported across folders. Page-specific rules follow it. */

:root {
  color-scheme: light;

  /* paper and ink */
  --paper: #fcfbf7;
  --wash: #f3f1ea;          /* the only fill for a region that must read as "a thing" */
  --ink: #1c1b18;
  --ink-2: #57544c;         /* secondary text, captions */
  --ink-3: #716d63;         /* tertiary: ticks, meta, disabled */
  --rule: #e2ded3;          /* hairlines, gridlines */
  --rule-2: #c9c4b6;        /* control borders, axis lines */
  --link: #1f4e79;

  /* data colors: muted, colorblind-checked (derived from Okabe-Ito).
     Each page maps entities to these once and never reassigns them. */
  --c-blue:   #2f6ea6;
  --c-orange: #ae5019;
  --c-green:  #23765b;
  --c-purple: #6a51a3;
  --c-red:    #b8433a;
  --c-gold:   #b8901f;
  --c-sky:    #6ea8d6;
  --c-grey:   #a8a396;      /* context data: everything not being discussed */

  --serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "Source Sans 3", -apple-system, "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* the grid: a reading column, a gutter, and a margin for notes */
  --text: 37rem;
  --gap: 2.5rem;
  --margin: 15rem;
  --page: calc(var(--text) + var(--gap) + var(--margin));
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 3.5rem; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--serif); font-size: 1.1875rem; line-height: 1.58;
  font-optical-sizing: auto; -webkit-font-smoothing: antialiased;
  counter-reset: sidenote figure;
}
::selection { background: #e8dfc3; }
:focus-visible { outline: 3px solid var(--link); outline-offset: 3px; }

/* ---------- page frame ---------- */
.page { max-width: calc(var(--page) + 3rem); margin: 0 auto; padding: 0 1.5rem 6rem; }
.page > :not(section), section > * { max-width: var(--text); }
.page > .wide, section > .wide { max-width: none; }
.page > h1 { max-width: 48rem; }

/* ---------- type ---------- */
h1, h2, h3 { font-weight: 400; color: var(--ink); text-wrap: balance; }
h1 { font-size: clamp(2.5rem, 5.5vw, 3.6rem); line-height: 1.04; letter-spacing: -0.012em; margin: 4.5rem 0 0.6rem; }
.subtitle { font-style: italic; font-size: 1.45rem; line-height: 1.35; color: var(--ink-2); margin: 0 0 2rem; }
h2 { font-size: 1.95rem; line-height: 1.15; letter-spacing: -0.005em; margin: 4.5rem 0 1rem; }
h3 { font-style: italic; font-size: 1.35rem; line-height: 1.25; margin: 2.5rem 0 0.6rem; }
p, ul, ol { margin: 0 0 1.1rem; text-wrap: pretty; }
ul, ol { padding-left: 1.3rem; }
li { margin-bottom: 0.35rem; }
li::marker { color: var(--ink-3); }
strong, b { font-weight: 600; }
em, i { font-style: italic; }
.lede { font-size: 1.3rem; line-height: 1.5; }
.meta { font-family: var(--sans); font-size: 0.8125rem; color: var(--ink-3); letter-spacing: 0.01em; }
.smallcaps { font-variant-caps: all-small-caps; letter-spacing: 0.04em; }
a { color: var(--link); text-decoration-line: underline; text-decoration-thickness: 1px; text-underline-offset: 0.16em; text-decoration-color: color-mix(in srgb, var(--link) 35%, transparent); }
a:hover { text-decoration-color: currentColor; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 3rem 0; }

code, kbd, samp { font-family: var(--mono); font-size: 0.84em; }
pre { font-family: var(--mono); font-size: 0.82rem; line-height: 1.55; margin: 0 0 1.25rem; padding: 0.1rem 0 0.1rem 1rem; border-left: 1px solid var(--rule-2); overflow-x: auto; }
.num, table, svg text, .controls { font-variant-numeric: lining-nums tabular-nums; }

/* ---------- sidenotes and margin notes ----------
   <span class="sn-ref"></span><span class="sidenote">…</span>  numbered, inside the paragraph
   <span class="marginnote">…</span>                              unnumbered
   Wide screens: floated into the margin column. Narrow: an indented block. */
.sidenote, .marginnote {
  float: right; clear: right; width: var(--margin);
  margin: 0.3rem calc(-1 * (var(--margin) + var(--gap))) 1rem 0;
  font-size: 0.875rem; line-height: 1.45; color: var(--ink-2);
  font-style: normal; font-weight: 400;
}
.sn-ref { counter-increment: sidenote; }
.sn-ref::after { content: counter(sidenote); font-family: var(--sans); font-size: 0.66em; font-weight: 600; vertical-align: super; line-height: 0; margin-left: 0.08em; color: var(--ink-2); }
.sidenote::before { content: counter(sidenote) "\2002"; font-family: var(--sans); font-size: 0.8em; font-weight: 600; }
p, li, figure { position: relative; }

/* ---------- figures ----------
   <figure class="fig">          text-column width, caption in the margin on wide screens
   <figure class="fig wide">     full page width, caption below
   Inside: optional .controls, the graphic, then <figcaption>. No borders, no cards. */
figure { margin: 2.25rem 0 2.5rem; padding: 0; }
.fig { counter-increment: figure; }
.fig figcaption { font-size: 0.9375rem; line-height: 1.5; color: var(--ink-2); margin-top: 0.85rem; max-width: var(--text); }
.fig figcaption .fig-n::before { content: "Figure " counter(figure) ". "; font-family: var(--sans); font-weight: 600; font-size: 0.78rem; letter-spacing: 0.02em; color: var(--ink); }
.fig .takeaway { font-style: italic; color: var(--ink); }
.graphic { position: relative; }
.graphic svg { display: block; width: 100%; height: auto; overflow: visible; }
.scroll-x { overflow-x: auto; overscroll-behavior-x: contain; }
.scroll-x > * { min-width: var(--min, 36rem); }

/* ---------- controls: quiet, real, keyboard reachable ---------- */
.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 1.4rem; margin: 0 0 0.9rem; font-family: var(--sans); font-size: 0.875rem; color: var(--ink-2); }
.control { display: inline-flex; align-items: center; gap: 0.55rem; }
.control > .label { color: var(--ink-2); }
.control > output, .readout { font-family: var(--sans); color: var(--ink); font-weight: 600; min-width: 3.2ch; }
.btn {
  font: 500 0.875rem/1 var(--sans); color: var(--ink); background: transparent;
  border: 1px solid var(--rule-2); border-radius: 3px; padding: 0.5rem 0.75rem; min-height: 2.125rem;
  cursor: pointer; display: inline-flex; align-items: center; gap: 0.4rem;
}
.btn:hover { border-color: var(--ink-2); }
.btn:disabled { color: var(--ink-3); border-color: var(--rule); cursor: default; }
.btn.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.seg { display: inline-flex; border: 1px solid var(--rule-2); border-radius: 3px; overflow: hidden; }
.seg > button { font: 500 0.875rem/1 var(--sans); color: var(--ink-2); background: transparent; border: 0; padding: 0.5rem 0.75rem; min-height: 2.125rem; cursor: pointer; }
.seg > button + button { border-left: 1px solid var(--rule); }
.seg > button:hover { color: var(--ink); }
.seg > button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.seg > button:focus-visible { outline-offset: -3px; }

input[type="range"] { -webkit-appearance: none; appearance: none; background: transparent; width: 9rem; height: 1.5rem; margin: 0; cursor: pointer; }
input[type="range"]::-webkit-slider-runnable-track { height: 2px; background: var(--rule-2); }
input[type="range"]::-moz-range-track { height: 2px; background: var(--rule-2); }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; margin-top: -6px; border-radius: 50%; background: var(--ink); border: 2px solid var(--paper); box-shadow: 0 0 0 1px var(--ink); }
input[type="range"]::-moz-range-thumb { width: 12px; height: 12px; border-radius: 50%; background: var(--ink); border: 2px solid var(--paper); box-shadow: 0 0 0 1px var(--ink); }
input[type="range"]:focus-visible { outline: 3px solid var(--link); outline-offset: 3px; }
select { font: 0.875rem var(--sans); color: var(--ink); background: var(--paper); border: 1px solid var(--rule-2); border-radius: 3px; padding: 0.4rem 0.5rem; }

/* ---------- tables: booktabs ---------- */
table { border-collapse: collapse; width: 100%; font-family: var(--sans); font-size: 0.9rem; line-height: 1.35; margin: 0 0 1.25rem; }
thead th { font-weight: 600; font-size: 0.78rem; letter-spacing: 0.02em; color: var(--ink-2); text-align: left; border-bottom: 1px solid var(--ink); padding: 0.5rem 0.75rem 0.4rem 0; vertical-align: bottom; }
tbody td, tbody th { padding: 0.45rem 0.75rem 0.45rem 0; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; font-weight: 400; }
tbody tr:last-child td, tbody tr:last-child th { border-bottom: 1px solid var(--ink); }
td.n, th.n { text-align: right; }

/* ---------- charts (SVG): data ink only ---------- */
.axis line, .axis path { stroke: var(--rule-2); stroke-width: 1; shape-rendering: crispEdges; }
.grid line { stroke: var(--rule); stroke-width: 1; shape-rendering: crispEdges; }
.tick text, .axis text { font-family: var(--sans); font-size: 11.5px; fill: var(--ink-3); }
.axis-title { font-family: var(--sans); font-size: 12px; fill: var(--ink-2); }
.label { font-family: var(--sans); font-size: 12.5px; fill: var(--ink); }
.label.muted { fill: var(--ink-2); }
.annot { font-family: var(--serif); font-style: italic; font-size: 13.5px; fill: var(--ink-2); }

/* ---------- top bar: back to the collection, sections, reading progress ---------- */
.topbar { position: sticky; top: 0; z-index: 20; background: var(--paper); border-bottom: 1px solid var(--rule); font-family: var(--sans); font-size: 0.8125rem; }
.topbar-inner { max-width: calc(var(--page) + 3rem); margin: 0 auto; padding: 0 1.5rem; display: flex; align-items: center; gap: 1.25rem; height: 2.75rem; }
.topbar .home { color: var(--ink-2); text-decoration: none; white-space: nowrap; }
.topbar .home:hover { color: var(--ink); }
.topbar .title { color: var(--ink); font-weight: 600; white-space: nowrap; }
.topbar nav { display: flex; gap: 1rem; min-width: 0; overflow-x: auto; scrollbar-width: thin; scrollbar-color: var(--rule-2) var(--paper); margin-left: auto; scroll-padding-inline: 0.25rem; }
.topbar nav a { color: var(--ink-3); text-decoration: none; white-space: nowrap; padding: 0.75rem 0.2rem; }
.topbar nav a:hover, .topbar nav a[aria-current="true"] { color: var(--ink); }
.topbar nav a[aria-current="true"] { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 0.35em; }
.topbar nav a:focus-visible { outline-offset: -3px; }
.progress { position: absolute; left: 0; bottom: -1px; height: 1px; background: var(--ink); width: 0; }

/* ---------- colophon ---------- */
.colophon { margin-top: 5rem; padding-top: 1.25rem; border-top: 1px solid var(--rule); font-size: 0.9rem; color: var(--ink-2); }

/* ---------- narrow screens: notes and captions fall into the column ---------- */
@media (min-width: 62rem) {
  /* minmax(min-content, auto) keeps a scrolling child (overflow-x: auto) from sizing its row to 0,
     which would push the spanning caption's height into empty rows below the graphic */
  .fig:not(.wide) { display: grid; grid-template-columns: var(--text) var(--margin); grid-auto-rows: minmax(min-content, auto); column-gap: var(--gap); max-width: none; align-items: end; }
  .fig:not(.wide) > * { grid-column: 1; }
  .fig:not(.wide) > figcaption { grid-column: 2; grid-row: 1 / span 6; align-self: end; margin: 0; }
}
@media (max-width: 61.99rem) {
  .sidenote, .marginnote { float: none; display: block; width: auto; margin: 0.6rem 0 0.9rem; padding-left: 0.9rem; border-left: 1px solid var(--rule-2); }
}
@media (max-width: 40rem) {
  body { font-size: 1.0625rem; line-height: 1.55; }
  .page, .topbar-inner { padding-left: 1rem; padding-right: 1rem; }
  h1 { margin-top: 3rem; }
  .subtitle { font-size: 1.25rem; }
  .lede { font-size: 1.125rem; }
  h2 { font-size: 1.6rem; margin-top: 3.5rem; }
  .topbar .title { display: none; }
  .btn, .seg > button { min-height: 2.5rem; }
  input[type="range"] { width: 7.5rem; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* =====================================================================
   Page-specific: JAX and PyTorch
   ===================================================================== */

/* Entity colors, mapped once. JAX is violet, PyTorch orange, "active
   right now" green, an error red. Never reassigned below. */
:root {
  --jax: var(--c-purple);
  --torch: var(--c-orange);
  --active: var(--c-green);
  --err: var(--c-red);
  --jax-tint: color-mix(in srgb, var(--c-purple) 13%, var(--paper));
  --torch-tint: color-mix(in srgb, var(--c-orange) 15%, var(--paper));
  --active-tint: color-mix(in srgb, var(--c-green) 15%, var(--paper));
  --err-tint: color-mix(in srgb, var(--c-red) 12%, var(--paper));
}
.jax-c { color: var(--jax); }
.torch-c { color: var(--torch); }
section { scroll-margin-top: 3.25rem; }
h2 code, h3 code { font-size: 0.8em; }

/* ---------- code: static blocks and widget blocks ---------- */
pre.code { font-size: 0.78rem; margin: 0 0 0.9rem; }
pre.code .ln { display: block; margin-left: -1rem; padding-left: calc(1rem - 2px); border-left: 2px solid transparent; min-height: 1.55em; white-space: pre; }
pre.code .ln.now { background: var(--active-tint); border-left-color: var(--active); }
pre.code .ln.err { background: var(--err-tint); border-left-color: var(--err); }
pre.code .ln.new { background: var(--jax-tint); }
pre.code .ln.hl { background: var(--jax-tint); }
pre.code.torch-code .ln.hl { background: var(--torch-tint); }
pre.code .ln.dim, pre.code .ln.dim * { color: var(--ink-3); font-weight: 400; font-style: normal; }
pre.code .ln.placeholder { color: var(--ink-3); font-family: var(--sans); font-size: 0.8125rem; }
.tok-kw { color: var(--ink); font-weight: 500; }
.tok-cm { color: var(--ink-3); font-style: italic; }
.tok-str, .tok-num, .tok-dec { color: var(--ink-2); }
.tok-j { color: var(--jax); }
.tok-t { color: var(--torch); }

/* ---------- inside figures ---------- */
.fig h4 { font: 600 0.8125rem/1.3 var(--sans); color: var(--ink); margin: 0 0 0.45rem; letter-spacing: 0.01em; }
.fig h4 .sub { font-weight: 400; color: var(--ink-2); }
.note { font-family: var(--sans); font-size: 0.875rem; line-height: 1.45; color: var(--ink-2); margin: 0 0 0.75rem; }
.note code { font-size: 0.8rem; }
.note.err { color: var(--err); }
.readline { font-family: var(--sans); font-size: 0.875rem; color: var(--ink-2); margin: 0 0 0.4rem; font-variant-numeric: lining-nums tabular-nums; }
.readline b { color: var(--ink); font-weight: 600; }
.cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.5rem 2rem; }
.cols > * { min-width: 0; }
@media (max-width: 46rem) { .cols { grid-template-columns: minmax(0, 1fr); } }
.controls .sep { width: 1px; align-self: stretch; background: var(--rule); }
.controls .btn.mono, .seg.mono > button { font-family: var(--mono); font-size: 0.78rem; }
[hidden] { display: none !important; }
.btn.toggle[aria-pressed="true"] { background: var(--wash); color: var(--ink); border-color: var(--ink-2); }
.btn.toggle[aria-pressed="false"] { color: var(--ink-2); }
.btn.toggle.op[aria-pressed="false"] { color: var(--ink-3); border-style: dashed; text-decoration: line-through; }
.controls output, .controls .readout { font-weight: 600; color: var(--ink); }
.controls .lbl { color: var(--ink-2); }
.controls.tight { column-gap: 0.45rem; }
.controls.tight > .lbl { margin-right: 0.4rem; }
.controls.tight > [data-role="clear"] { margin-left: 0.6rem; }

/* ---------- figure 1: what each call does ---------- */
table.routes th[scope="row"] { color: var(--ink); font-weight: 400; }
table.routes td { white-space: normal; }
table.routes td.run::before { content: ""; display: inline-block; width: 0.55em; height: 0.55em; margin-right: 0.4em; vertical-align: 0.05em; }
table.routes td.run.jax::before { background: var(--jax); }
table.routes td.run.torch::before { background: var(--torch); }
table.routes td.skip { color: var(--ink-3); }
table.routes thead th:not(:first-child) { width: 24%; }

/* ---------- comparison tables (layers, choosing) ---------- */
table.cmp tbody th { font-weight: 600; color: var(--ink-2); width: 18%; }
table.cmp td b { font-weight: 600; color: var(--ink); display: block; }
table.cmp td { color: var(--ink-2); }
table.cmp code { font-size: 0.82em; }
@media (max-width: 40rem) {
  table.cmp thead tr, table.cmp tbody tr { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: 0.75rem; }
  table.cmp thead th:first-child { display: none; }
  table.cmp tbody th { grid-column: 1 / -1; width: auto; border-bottom: 0; padding-bottom: 0; }
  table.cmp tbody tr { border-bottom: 1px solid var(--rule); }
  table.cmp tbody tr:last-child { border-bottom: 1px solid var(--ink); }
  table.cmp tbody td, table.cmp tbody tr:last-child td, table.cmp tbody tr:last-child th { border-bottom: 0; }
}

/* ---------- tracing ---------- */
.tracing .grid2 { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.25fr); gap: 0.25rem 2rem; }
.tracing .grid2 > * { min-width: 0; }
.tracing .tracers { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-2); min-height: 1.4rem; margin: 0 0 0.35rem; }
.tracing .stdout { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-2); margin: 0 0 0.9rem; min-height: 1.2rem; white-space: pre-wrap; overflow-wrap: anywhere; }
.tracing .stdout .k { color: var(--ink-3); }
.tracing .log { list-style: none; margin: 0 0 0.6rem; padding: 0; font-family: var(--sans); font-size: 0.875rem; line-height: 1.4; }
.tracing .log li { display: grid; grid-template-columns: 1.8rem minmax(0, 1fr); gap: 0.4rem; padding: 0.3rem 0; border-bottom: 1px solid var(--rule); margin: 0; }
.tracing .log li.empty { display: block; color: var(--ink-3); }
.tracing .log .n { color: var(--ink-3); font-variant-numeric: tabular-nums; }
.tracing .log code { font-size: 0.78rem; }
.tracing .log .miss { color: var(--jax); font-weight: 600; }
.tracing .log .hit { color: var(--active); font-weight: 600; }
.tracing .log .bad { color: var(--err); font-weight: 600; }
.tracing .log .out { display: block; font-family: var(--mono); font-size: 0.75rem; color: var(--ink-3); overflow-wrap: anywhere; }
.tracing .cache { font-family: var(--sans); font-size: 0.875rem; color: var(--ink-2); margin: 0 0 0.9rem; }
.tracing .cache code { color: var(--jax); }
.tracing .eager { font-family: var(--sans); font-size: 0.875rem; color: var(--ink-2); border-top: 1px solid var(--rule); padding-top: 0.6rem; margin: 0.4rem 0 0; }
.tracing .eager b { color: var(--torch); font-weight: 600; }
@media (max-width: 46rem) { .tracing .grid2 { grid-template-columns: minmax(0, 1fr); } }

/* ---------- fusion ---------- */
.fusion .multiple + .multiple { margin-top: 1.1rem; }
.fusion .multiple h4 { margin-bottom: 0.2rem; }
.fusion svg { display: block; overflow: visible; }
.fusion .kbox { stroke-width: 1; }
.fusion .eager .kbox { fill: var(--torch-tint); stroke: var(--torch); }
.fusion .compiled .kbox { fill: var(--jax-tint); stroke: var(--jax); }
.fusion .kdiv { stroke: var(--jax); stroke-width: 1; stroke-dasharray: 2 3; }
.fusion .tbox { fill: var(--paper); stroke: var(--ink-3); stroke-width: 1; }
.fusion .tlab { font-family: var(--mono); font-size: 11.5px; fill: var(--ink); }
.fusion .arr { stroke: var(--ink-3); stroke-width: 1; fill: none; }
.fusion .arrhead { fill: var(--ink-3); }

/* ---------- autodiff ---------- */
.autodiff svg { display: block; overflow: visible; }
.autodiff .edge { stroke: var(--rule-2); stroke-width: 1; }
.autodiff .node circle { fill: var(--paper); stroke: var(--ink-3); stroke-width: 1; }
.autodiff .node.on circle { fill: var(--active-tint); stroke: var(--active); stroke-width: 1.5; }
.autodiff .node text { font-family: var(--sans); font-size: 13px; fill: var(--ink); }
.autodiff .val { font-family: var(--mono); font-size: 11.5px; fill: var(--ink-2); }
.autodiff .val.pending { fill: var(--ink-3); }
.autodiff .grad { font-family: var(--mono); font-size: 11.5px; fill: var(--ink); }
.autodiff .const { font-family: var(--mono); font-size: 11.5px; fill: var(--ink-3); }
.autodiff .tape { list-style: none; margin: 0 0 0.6rem; padding: 0; font-family: var(--mono); font-size: 0.78rem; }
.autodiff .tape li { display: flex; justify-content: space-between; gap: 0.75rem; padding: 0.2rem 0.5rem; margin: 0; border-left: 2px solid transparent; }
.autodiff .tape li .s { color: var(--ink-3); font-family: var(--sans); font-size: 0.8125rem; }
.autodiff .tape li.on { background: var(--active-tint); border-left-color: var(--active); }
.autodiff .tape li.popped { color: var(--ink-3); text-decoration: line-through; text-decoration-color: var(--ink-3); }
.autodiff .tape li.empty { color: var(--ink-3); font-family: var(--sans); font-size: 0.875rem; padding-left: 0; }
.autodiff .result { font-family: var(--mono); font-size: 0.8rem; color: var(--ink-2); margin: 0 0 0.9rem; }
.autodiff .result b { color: var(--ink); font-weight: 600; }
.autodiff .note { min-height: 2.9em; }

/* ---------- vmap ---------- */
.vmap svg { display: block; overflow: visible; max-width: 100%; margin: 0.25rem 0 1rem; }
.vmap .cell { fill: var(--paper); stroke: var(--ink-3); stroke-width: 1; }
.vmap .cell.w { fill: var(--wash); }
.vmap .cell.y { fill: var(--jax-tint); stroke: var(--jax); }
.vmap .op { fill: var(--paper); stroke: var(--jax); stroke-width: 1; }
.vmap .flow { stroke: var(--ink-3); stroke-width: 1; fill: none; }
.vmap .lab { font-family: var(--sans); font-size: 11.5px; fill: var(--ink-2); }
.vmap .lab.mono { font-family: var(--mono); font-size: 11px; }
.vmap .oplab { font-family: var(--mono); font-size: 11px; fill: var(--jax); }

/* ---------- composer ---------- */
.composer { min-width: 0; } /* keep long code inside the reading column beside its caption */
.composer .expr { font-family: var(--mono); font-size: 1rem; margin: 0.2rem 0 0.6rem; min-height: 1.6rem; overflow-wrap: anywhere; }
.composer .expr .t { color: var(--jax); font-weight: 500; }
.composer .expr .p { color: var(--ink-3); }
.composer .sig { font-family: var(--sans); font-size: 0.875rem; color: var(--ink-2); margin: 0 0 0.4rem; }
.composer .sig code { color: var(--ink); }
.composer .expl { font-family: var(--sans); font-size: 0.875rem; line-height: 1.5; color: var(--ink-2); margin: 0 0 0.8rem; min-height: 3em; }
.composer .expl p { margin: 0 0 0.35rem; }
.composer .expl.bad { color: var(--err); }
.composer .eq h4 { color: var(--torch); }
.composer .controls + .controls { margin-top: -0.3rem; }

/* ---------- state and randomness ---------- */
.purity .expl { font-family: var(--sans); font-size: 0.875rem; line-height: 1.5; color: var(--ink-2); margin: 0 0 0.5rem; min-height: 4.4em; }
.purity .expl b { color: var(--ink); font-weight: 600; }
.purity pre.code .ln.dim { opacity: 0.8; }
table.rng td, table.rng th { font-variant-numeric: lining-nums tabular-nums; }
table.rng td.changed { color: var(--err); }
table.rng td.same { color: var(--ink-2); }
table.rng code { font-size: 0.8rem; }
.rng-pair table + table { margin-top: 1.5rem; }
table.rng caption { caption-side: top; text-align: left; font: 600 0.8125rem var(--sans); padding: 0 0 0.4rem; }

/* ---------- systolic array and GPU schedule ---------- */
.silicon svg { display: block; overflow: visible; width: 100%; height: auto; }
.silicon.systolic svg { max-width: 26rem; }
.silicon.gpu svg { max-width: 24rem; }
.silicon .lbl { font-family: var(--sans); font-size: 11.5px; fill: var(--ink-2); }
.silicon .lbl.strong { fill: var(--ink); font-weight: 600; }
.silicon .wire { stroke: var(--rule-2); stroke-width: 1; }
.silicon .wirehead { fill: var(--rule-2); }
.silicon .cell rect { fill: var(--paper); stroke: var(--rule-2); stroke-width: 1; }
.silicon .cell.on rect { fill: var(--active-tint); stroke: var(--active); }
.silicon .cell .w { font-family: var(--sans); font-size: 11px; fill: var(--ink-3); }
.silicon .cell.on .w { fill: var(--ink); }
.silicon .tok rect { fill: var(--paper); stroke: var(--jax); stroke-width: 1; }
.silicon .tok.in rect { fill: var(--jax); }
.silicon .tok text { font-family: var(--sans); font-size: 11px; font-weight: 600; fill: var(--jax); }
.silicon .tok.in text { fill: var(--paper); }
.silicon .ps rect { fill: var(--paper); stroke: var(--active); stroke-width: 1; }
.silicon .ps text { font-family: var(--sans); font-size: 11px; font-weight: 600; fill: var(--ink); }
.silicon .ccell rect { fill: var(--paper); stroke: var(--rule-2); stroke-width: 1; }
.silicon .ccell text { font-family: var(--sans); font-size: 11.5px; fill: var(--jax); font-weight: 600; opacity: 0; }
.silicon .ccell.done rect { fill: var(--jax-tint); stroke: var(--jax); }
.silicon .ccell.done text { opacity: 1; }
.silicon .tok, .silicon .ps { transition: transform 220ms ease-out, opacity 220ms ease-out; }
.silicon.no-motion .tok, .silicon.no-motion .ps { transition: none; }
.gpu .sm { fill: var(--paper); stroke: var(--ink-3); stroke-width: 1; }
.gpu .tile { stroke: var(--torch); stroke-width: 1; }
.gpu .tile.w1 { fill: color-mix(in srgb, var(--c-orange) 45%, var(--paper)); }
.gpu .tile.w2 { fill: var(--torch-tint); }
.gpu .t { font-family: var(--sans); font-size: 11.5px; fill: var(--ink); }
.gpu .t.muted { fill: var(--ink-2); }
.gpu .t.b { font-weight: 600; }
.gpu .annot { font-size: 13px; }

/* ---------- sharding ---------- */
.sharding .top { display: flex; flex-wrap: wrap; gap: 0.75rem 2rem; align-items: flex-start; margin-bottom: 0.9rem; }
.sharding svg { display: block; overflow: visible; }
.sharding .dev { fill: var(--paper); stroke: var(--ink-3); stroke-width: 1; }
.sharding .did { font-family: var(--sans); font-size: 12px; fill: var(--ink); font-weight: 600; }
.sharding .ax { font-family: var(--sans); font-size: 11.5px; fill: var(--ink-2); }
.sharding .arr-out { fill: var(--wash); stroke: var(--ink-2); stroke-width: 1; }
.sharding .blk { fill: none; stroke: var(--ink-2); stroke-width: 1; }
.sharding .blab { font-family: var(--sans); font-size: 11.5px; fill: var(--ink); }
.sharding .op { font-family: var(--mono); font-size: 15px; fill: var(--ink-3); }
.sharding .aname { font-family: var(--mono); font-size: 12px; fill: var(--ink); font-weight: 500; }
.sharding .aspec { font-family: var(--mono); font-size: 11px; fill: var(--jax); }
.sharding .grp { fill: var(--active-tint); stroke: var(--active); stroke-width: 1; }
.sharding .coll { list-style: none; margin: 0 0 0.9rem; padding: 0; font-family: var(--sans); font-size: 0.875rem; color: var(--ink-2); }
.sharding .coll li { display: flex; gap: 0.9rem; align-items: center; padding: 0.4rem 0; border-bottom: 1px solid var(--rule); margin: 0; }
.sharding .coll li:first-child { border-top: 1px solid var(--rule); }
.sharding .coll li b { color: var(--active); font-weight: 600; }
.sharding .coll li svg { flex: 0 0 auto; }
.sharding .coll li.none { color: var(--active); }
.sharding .torch-eq { font-family: var(--sans); font-size: 0.875rem; color: var(--ink-2); margin: 0 0 0.6rem; }
.sharding .torch-eq b { color: var(--torch); font-weight: 600; }
.sharding .specs { display: inline-flex; flex-wrap: wrap; gap: 0.5rem 1rem; }
.sharding select { font-family: var(--mono); font-size: 0.78rem; }

/* reading list */
.reading li { margin-bottom: 0.5rem; }