/* ============================================================
   Explorable: How to Parallelize a Transformer for Training
   Design system — warm paper, serif prose, live ink.
   ============================================================ */

:root {
  color-scheme: light;
  /* surfaces & ink */
  --surface: #fcfcfb;
  --page: #f9f9f7;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --hairline: rgba(11, 11, 11, 0.10);
  /* categorical series (fixed order — never re-order) */
  --s1: #2a78d6;
  --s2: #eb6834;
  --s3: #1baf7a;
  --s4: #eda100;
  --s5: #e87ba4;
  --s6: #008300;
  --s7: #4a3aa7;
  --s8: #e34948;
  /* tangle conventions */
  --scrub: #006300;
  --scrub-bg: rgba(0, 99, 0, 0.07);
  --derived: #1c5cab;
  --derived-bg: rgba(28, 92, 171, 0.07);
  /* status */
  --good: #0ca30c;
  --bad: #d03b3b;
  --warn: #b45309;
  /* dimension token colors (text-safe on light surface) */
  --dim-B: #4a3aa7;
  --dim-D: #1c5cab;
  --dim-F: #9a4a00;
  --dim-DP: #00695f;
  --dim-TP: #ad2f2f;
  --dim-L: #52514e;
  --dim-N: #0b0b0b;
  --dim-C: #52514e;
  --dim-W: #52514e;
  --dim-PP: #00695f;
  --dim-EP: #6d28d9;
  --dim-T: #52514e;
  --dim-M: #ad2f2f;
  --dim-E: #6d28d9;
  --dim-k: #0e7a57;
  /* type */
  --serif: "Charter", "Iowan Old Style", "Palatino", "Georgia", serif;
  --sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", "Menlo", "Consolas", monospace;
  /* layout */
  --measure: 43rem;
  --breakout: 62rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* ---------- page scaffold ---------- */

.paper {
  max-width: var(--breakout);
  margin: 0 auto;
  padding: 0 1.25rem 6rem;
}

.paper > header, .paper section, .paper footer {
  max-width: var(--measure);
  margin-left: auto;
  margin-right: auto;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  line-height: 1.2;
  font-weight: 700;
  color: var(--ink);
}
h1 { font-size: 2.3rem; margin: 1.2rem 0 0.4rem; letter-spacing: -0.01em; }
h2 { font-size: 1.65rem; margin: 3.2rem 0 0.8rem; padding-top: 1.4rem; border-top: 1px solid var(--grid); }
h3 { font-size: 1.25rem; margin: 2.2rem 0 0.6rem; }
p { margin: 0 0 1.05em; }
a { color: var(--derived); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: #104281; }
strong { font-weight: 700; }
hr { border: none; border-top: 1px solid var(--grid); margin: 2.5rem 0; }

.byline { color: var(--ink-2); font-size: 0.95rem; margin-bottom: 0.2rem; }
.byline a { color: inherit; }
.dek { font-size: 1.12rem; color: var(--ink-2); font-style: italic; margin: 0.6rem 0 1.4rem; }

/* ---------- how-to-read banner ---------- */

.howto {
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  font-size: 0.95rem;
  color: var(--ink-2);
  margin: 1.4rem 0 2rem;
}
.howto .k { white-space: nowrap; }

/* ---------- config bar (the machine) ---------- */

.machine {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--grid);
  font-family: var(--sans);
  font-size: 0.82rem;
  padding: 0.35rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.4rem;
  align-items: baseline;
  justify-content: center;
  color: var(--ink-2);
}
.machine .group { white-space: nowrap; }
.machine .group > .glabel {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.68rem;
  margin-right: 0.35em;
}
.machine select {
  font: inherit;
  color: var(--ink);
  background: transparent;
  border: none;
  border-bottom: 1px dotted var(--axis);
  padding: 0 0.1em;
  cursor: pointer;
}
button.reset {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--muted);
  background: none;
  border: 1px solid var(--grid);
  border-radius: 999px;
  padding: 0.05rem 0.6rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
button.reset:hover { color: var(--ink); border-color: var(--axis); }

/* spec/measured segmented control (machine bar) */
.machine .seg { display: inline-flex; margin-left: 0.5em; vertical-align: baseline; }
.machine .seg-opt {
  font-family: var(--sans);
  font-size: 0.7rem;
  color: var(--ink-2);
  background: var(--page);
  border: 1px solid var(--grid);
  padding: 0.06rem 0.5rem;
  cursor: pointer;
}
.machine .seg-opt:first-child { border-radius: 999px 0 0 999px; }
.machine .seg-opt:last-child { border-radius: 0 999px 999px 0; border-left: none; }
.machine .seg-opt:hover { color: var(--ink); }
.machine .seg-opt[aria-pressed="true"] {
  background: var(--ink);
  color: var(--surface);
  border-color: var(--ink);
}
/* conspicuous when the state has strayed from the defaults — orange, a
   notification color deliberately distinct from the scrub green */
button.reset.dirty {
  color: var(--warn);
  border-color: var(--warn);
  background: rgba(180, 83, 9, 0.08);
  font-weight: 600;
}
button.reset.dirty::before { content: "● "; font-size: 0.6em; vertical-align: middle; }
button.reset.dirty:hover { color: #7c3a06; background: rgba(180, 83, 9, 0.15); }

/* ---------- tangle: scrubbable + derived ---------- */

.t-var {
  color: var(--scrub);
  background: var(--scrub-bg);
  border-bottom: 1px dashed var(--scrub);
  border-radius: 3px;
  padding: 0 0.15em;
  font-weight: 700;
  cursor: ew-resize;
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
  outline-offset: 2px;
}
.t-var:focus-visible { outline: 2px solid var(--scrub); }
.t-var.dragging { background: rgba(0, 99, 0, 0.16); }
.t-var.editing {
  cursor: text;
  user-select: text;
  -webkit-user-select: text;
  background: var(--surface);
  outline: 2px solid var(--scrub);
  border-bottom-style: solid;
  min-width: 2ch;
  display: inline-block;
}

.t-out {
  color: var(--derived);
  background: var(--derived-bg);
  border-radius: 3px;
  padding: 0 0.15em;
  font-weight: 700;
  white-space: nowrap;
}

.t-if { font-weight: 700; white-space: nowrap; }
.t-if.t-if-true { color: var(--good); }
.t-if.t-if-false { color: var(--bad); }

.t-show { display: block; }
tr.t-show { display: table-row; }
.t-show[hidden] { display: none !important; }
.tip-link a { color: var(--derived); }

.try {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--ink-2);
  background: var(--surface);
  border-left: 3px solid var(--s3);
  border-radius: 0 6px 6px 0;
  padding: 0.55rem 0.85rem;
  margin: 1rem 0;
}
.try::before { content: "✦ "; color: var(--s3); }

/* ---------- presets ---------- */

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  font-family: var(--sans);
  font-size: 0.82rem;
  margin: 0.6rem 0 1rem;
}
.preset-label { color: var(--muted); }
button.t-preset {
  font: inherit;
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-2);
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: 999px;
  padding: 0.15rem 0.75rem;
  cursor: pointer;
}
button.t-preset:hover { border-color: var(--axis); color: var(--ink); }
button.t-preset.active { border-color: var(--scrub); color: var(--scrub); }

/* ---------- equations ---------- */

.eq {
  font-family: var(--serif);
  font-size: 1.05em;
  margin: 1.2rem auto;
  text-align: center;
  line-height: 1.4;
}
.eq-i { white-space: nowrap; }

.v { font-style: italic; font-weight: 600; border-radius: 3px; padding: 0 0.06em; cursor: default; }
.v sub { font-style: normal; font-size: 0.68em; }
.v-B { color: var(--dim-B); }
.v-D { color: var(--dim-D); }
.v-F { color: var(--dim-F); }
.v-L { color: var(--dim-L); }
.v-DP { color: var(--dim-DP); }
.v-TP { color: var(--dim-TP); }
.v-N { color: var(--dim-N); }
.v-C { color: var(--dim-C); }
.v-W { color: var(--dim-W); }
.v-PP { color: var(--dim-PP); }
.v-EP { color: var(--dim-EP); }
.v-T { color: var(--dim-T); }
.v-P { color: var(--dim-N); }
.v-M { color: var(--dim-M); }
.v-E { color: var(--dim-E); }
.v-k { color: var(--dim-k); }

/* live table rows: the row matching the page state shows live values */
tr.live-row td[data-live] .cell-static,
tr.live-row td[data-live-expr] .cell-static { display: none; }
tr:not(.live-row) td[data-live] .cell-live,
tr:not(.live-row) td[data-live-expr] .cell-live { display: none; }

/* dim hover cross-highlight: core toggles .hl-<dim> on <html> */
.hl-B .v-B, .hl-D .v-D, .hl-F .v-F, .hl-L .v-L, .hl-DP .v-DP,
.hl-TP .v-TP, .hl-N .v-N, .hl-C .v-C, .hl-W .v-W, .hl-PP .v-PP, .hl-M .v-M,
.hl-E .v-E, .hl-k .v-k, .hl-EP .v-EP, .hl-T .v-T, .hl-P .v-P {
  background: rgba(237, 161, 0, 0.28);
}

.frac {
  display: inline-flex;
  flex-direction: column;
  vertical-align: middle;
  text-align: center;
  margin: 0 0.15em;
}
.frac > span { display: block; padding: 0 0.3em; }
.frac > span + span { border-top: 1.5px solid currentColor; }

.sqrt { display: inline-flex; align-items: stretch; vertical-align: middle; }
.sqrt::before { content: "√"; align-self: flex-end; font-size: 1.15em; line-height: 1; transform: translateY(-2%); }
.sqrt > span { border-top: 1.5px solid currentColor; padding: 0.1em 0.25em 0 0.15em; }

.eq-live {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--ink-2);
  text-align: center;
  margin: -0.5rem 0 1.2rem;
}

.shape {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: 4px;
  padding: 0 0.25em;
  white-space: nowrap;
}
.shape sub { font-size: 0.7em; }

/* ---------- boxes ---------- */

.takeaway {
  background: var(--surface);
  border: 1px solid var(--grid);
  border-left: 4px solid var(--s1);
  border-radius: 0 8px 8px 0;
  padding: 0.85rem 1.1rem;
  margin: 1.4rem 0;
}
.note {
  background: var(--surface);
  border: 1px solid var(--grid);
  border-left: 4px solid var(--s4);
  border-radius: 0 8px 8px 0;
  padding: 0.85rem 1.1rem;
  margin: 1.4rem 0;
  font-size: 0.97em;
}

/* ---------- sidenotes ---------- */

.sn { position: relative; }
.sn-ref {
  font: inherit;
  font-size: 0.75em;
  vertical-align: super;
  color: var(--derived);
  background: none;
  border: none;
  padding: 0 0.15em;
  cursor: pointer;
}
.sn-body {
  display: none;
  font-family: var(--sans);
  font-size: 0.8rem;
  line-height: 1.45;
  color: var(--ink-2);
}
@media (max-width: 79.99rem) {
  /* narrow screens only: ◦/✦/Δ click expands the note inline */
  .sn.open .sn-body {
    display: block;
    background: var(--surface);
    border: 1px solid var(--grid);
    border-radius: 6px;
    padding: 0.5rem 0.7rem;
    margin: 0.4rem 0;
  }
}
/* wide screens: clicking the marker flashes the (already visible) margin note */
.sn-body.flash { animation: sn-flash 1s ease-out; }
@keyframes sn-flash {
  0%, 50% { background: rgba(237, 161, 0, 0.3); }
  100% { background: transparent; }
}
/* …and clicking the note highlights the sentence it annotates */
::highlight(sn-anchor) { background-color: rgba(237, 161, 0, 0.35); }
@media (min-width: 80rem) {
  .sn-body { cursor: pointer; }
}
.paper { position: relative; }
@media (min-width: 80rem) {
  /* margin notes: absolutely positioned by the collision-resolving layout
     pass in core.js (layoutMarginNotes) — beside their anchor when there is
     room, shunted down past their neighbors when there isn't */
  .sn { position: static; }
  .sn-body {
    display: block;
    position: absolute;
    top: 0;
    left: -9999px;
    width: 16rem;
    opacity: 0;
    padding-top: 0.25em;
    border-top: 1px solid var(--grid);
  }
  .sn-body.laid { opacity: 1; transition: opacity 0.15s; }
  .sn-ref { cursor: default; }
  /* hovering either end of the tether highlights the pair */
  .sn:hover .sn-body, .sn:focus-within .sn-body { background: rgba(237, 161, 0, 0.12); }
  .sn-body.sn-hot { background: rgba(237, 161, 0, 0.12); }
}

/* ---------- provenance: the margin is the adaptation's voice ----------
   .sn         plain  — original chapter footnote (◦ marker)
   .sn.adapt   ✦      — adaptation note: instructional text, try-prompts, GPU asides
   .sn.edit    Δ      — edit disclosure: quotes the original sentence and states the change
*/
.sn-tag {
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-right: 0.35em;
}
.sn.adapt > .sn-ref { color: #0e7a57; }
.sn.adapt .sn-tag { color: #0e7a57; }
.sn.adapt .sn-tag::before { content: "✦ "; }
@media (min-width: 80rem) {
  .sn.adapt .sn-body { border-top-color: rgba(27, 175, 122, 0.5); }
}
.sn.edit > .sn-ref { color: var(--warn); }
.sn.edit .sn-tag { color: var(--warn); }
.sn.edit .sn-tag::before { content: "Δ "; }
@media (min-width: 80rem) {
  .sn.edit .sn-body { border-top-color: rgba(180, 83, 9, 0.45); }
}
.sn-body .orig { font-style: italic; }
/* inline editorial interjection: corrects a chapter statement that this
   edition's merges have made inaccurate as written */
.ed { font-style: italic; color: #0e7a57; }
/* woven-in added content: dotted underline, disclosed once in the header */
.add { text-decoration: underline dotted 1.5px; text-decoration-color: var(--muted); text-underline-offset: 3px; }
select.inline-select {
  font-family: var(--sans); font-size: 0.82rem; color: var(--ink);
  background: transparent; border: none; border-bottom: 1px dotted var(--axis);
  padding: 0 0.1em; cursor: pointer;
}
.ed a { color: inherit; }
/* an adaptation postscript folded into the same note (avoids doubled ◦✦ markers) */
.sn-post {
  display: block;
  margin-top: 0.4rem;
  padding-top: 0.35rem;
  border-top: 1px dashed var(--grid);
}

/* inline conditional (e.g. GPU-only phrases) */
.t-show.inline { display: inline; }
.t-show.inline[hidden] { display: none; }

/* ---------- algorithms & details ---------- */

details.algo, details.answer {
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: 8px;
  margin: 1.1rem 0;
  padding: 0;
}
details.algo > summary, details.answer > summary {
  font-family: var(--sans);
  font-size: 0.88rem;
  color: var(--ink-2);
  padding: 0.6rem 1rem;
  cursor: pointer;
  user-select: none;
}
details.algo[open] > summary, details.answer[open] > summary {
  border-bottom: 1px solid var(--grid);
}
details.algo > *:not(summary), details.answer > *:not(summary) { margin: 0.8rem 1rem; }

.algorithm {
  font-size: 0.92em;
}
.algorithm ol { padding-left: 1.4em; margin: 0.4em 0; }
.algorithm li { margin: 0.3em 0; }
.algorithm .phase { font-family: var(--sans); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); margin: 0.8em 0 0.2em; }
.algorithm .cmt { color: var(--muted); font-style: italic; }

/* comms ops: colored text only — the color carries the scannability,
   the old pill chrome was noise (editor's call, Aug 2026) */
.op {
  font-family: var(--sans);
  font-size: 0.82em;
  font-weight: 650;
  letter-spacing: 0.015em;
  white-space: nowrap;
}
.op-ag { color: #104281; }
.op-rs { color: #7a3413; }
.op-ar { color: #3a2b85; }

pre.code {
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.5;
}
code { font-family: var(--mono); font-size: 0.85em; }

/* ---------- tables ---------- */

table.tbl {
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.85rem;
  margin: 1.2rem auto;
  width: 100%;
}
table.tbl th, table.tbl td {
  border-bottom: 1px solid var(--grid);
  padding: 0.45rem 0.7rem;
  text-align: left;
  vertical-align: top;
}
table.tbl th {
  font-weight: 600;
  color: var(--ink-2);
  border-bottom: 2px solid var(--axis);
}
table.tbl td.num, table.tbl th.num { text-align: right; font-variant-numeric: tabular-nums; }
.tbl-wrap { overflow-x: auto; max-width: 100%; }
.tbl-wrap > table.tbl { margin: 1.2rem 0; }
table.tbl.tbl-compact { font-size: 0.76rem; }
table.tbl.tbl-compact th, table.tbl.tbl-compact td { padding: 0.3rem 0.45rem; }
table.tbl.tbl-compact button.t-preset { font-size: 0.76rem; padding: 0.1rem 0.55rem; }
/* sortable headers */
table.sortable th.th-sort { cursor: pointer; user-select: none; white-space: nowrap; }
table.sortable th.th-sort:hover { color: var(--ink); }
table.sortable th.th-sort::after { content: " ↕"; color: var(--axis); font-size: 0.85em; }
table.sortable th.th-sort[aria-sort="ascending"]::after { content: " ↑"; color: var(--ink); }
table.sortable th.th-sort[aria-sort="descending"]::after { content: " ↓"; color: var(--ink); }

/* ---------- widgets & figures ---------- */

.widget {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--ink-2);
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: 10px;
  padding: 1rem;
  margin: 1.4rem 0;
}
.widget svg { display: block; max-width: 100%; height: auto; }
.widget svg text { font-family: var(--sans); }

figure.breakout {
  max-width: var(--breakout);
  width: 100%;
  margin: 1.8rem auto;
}
@media (min-width: 70rem) {
  .paper section figure.breakout {
    width: var(--breakout);
    margin-left: calc((var(--measure) - var(--breakout)) / 2);
  }
}
figure.breakout figcaption, figure figcaption {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.5rem;
  text-align: center;
}
figure { margin: 1.8rem 0; }

/* widget internals shared vocabulary */
.widget .w-title {
  font-weight: 600;
  color: var(--ink);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}
.widget .w-row { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
.widget .w-controls {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.2rem; align-items: center;
  margin-bottom: 0.6rem;
}
.widget .w-readout { font-variant-numeric: tabular-nums; }
.widget button {
  font: inherit;
  color: var(--ink-2);
  background: var(--page);
  border: 1px solid var(--grid);
  border-radius: 6px;
  padding: 0.2rem 0.7rem;
  cursor: pointer;
}
.widget button:hover { border-color: var(--axis); color: var(--ink); }
.widget button[aria-pressed="true"], .widget button.active {
  background: var(--ink);
  color: var(--surface);
  border-color: var(--ink);
}
.widget .tabs { display: flex; gap: 0.3rem; flex-wrap: wrap; margin-bottom: 0.8rem; }

.verdict {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.8rem;
  border-radius: 999px;
  padding: 0.15em 0.8em;
  white-space: nowrap;
}
.verdict.ok { color: #075607; background: rgba(12, 163, 12, 0.12); }
.verdict.bad { color: #8f2222; background: rgba(208, 59, 59, 0.12); }

/* instant provenance tooltip (t-var / t-out / t-if hovers) */
.hover-tip {
  position: fixed;
  z-index: 120;
  pointer-events: none;
  background: var(--surface);
  border: 1px solid var(--axis);
  border-radius: 6px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  padding: 0.4rem 0.65rem;
  max-width: 26rem;
  font-family: var(--sans);
  font-size: 0.74rem;
  line-height: 1.4;
  color: var(--ink-2);
}
.hover-tip.pinned .tip-handle { cursor: grab; }
.hover-tip.pinned .tip-handle:active { cursor: grabbing; }
.hover-tip .tip-label {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.15rem;
}
.hover-tip .tip-code { font-family: var(--mono); color: var(--ink); }
.hover-tip .tip-scrub {
  color: var(--scrub); background: var(--scrub-bg);
  border-bottom: 1px dashed var(--scrub); border-radius: 2px;
  padding: 0 0.12em; font-weight: 700; white-space: nowrap;
}
.hover-tip.pinned .tip-scrub { cursor: ew-resize; user-select: none; -webkit-user-select: none; touch-action: none; }
.hover-tip .tip-drv {
  color: var(--derived); background: var(--derived-bg);
  border-bottom: 1px dotted var(--derived); border-radius: 2px;
  padding: 0 0.12em; font-weight: 700; white-space: nowrap;
}
.hover-tip.pinned .tip-drv { cursor: pointer; }
.hover-tip .tip-explain { margin-top: 0.15rem; }
.hover-tip .tip-sub { font-family: var(--mono); color: var(--muted); margin-top: 0.1rem; overflow-wrap: break-word; }

/* chart tooltip (positioned by JS) */
.chart-tip {
  position: fixed;
  z-index: 100;
  pointer-events: none;
  background: var(--surface);
  border: 1px solid var(--axis);
  border-radius: 6px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  font-family: var(--sans);
  font-size: 0.78rem;
  padding: 0.45rem 0.65rem;
  color: var(--ink-2);
  min-width: 11rem;
}
.chart-tip .tip-x { font-weight: 700; color: var(--ink); margin-bottom: 0.25rem; }
.chart-tip .tip-row { display: flex; align-items: center; gap: 0.45rem; margin: 0.12rem 0; }
.chart-tip .tip-key { width: 14px; height: 0; border-top: 3px solid; border-radius: 2px; flex: none; }
.chart-tip .tip-val { font-weight: 700; color: var(--ink); margin-left: auto; font-variant-numeric: tabular-nums; }

/* legends */
.legend {
  display: flex; flex-wrap: wrap; gap: 0.4rem 1.1rem;
  font-size: 0.78rem; color: var(--ink-2);
  margin: 0.4rem 0 0.2rem;
  align-items: center;
}
.legend .lg { display: inline-flex; align-items: center; gap: 0.35rem; }
.legend .lg .key-line { width: 16px; border-top: 3px solid; border-radius: 2px; }
.legend .lg .key-rect { width: 12px; height: 12px; border-radius: 3px; }

/* ---------- TOC ---------- */

nav.toc {
  display: none;
}
@media (min-width: 88rem) {
  nav.toc {
    display: block;
    position: fixed;
    top: 5rem;
    left: max(1rem, calc(50vw - var(--breakout) / 2 - 15rem));
    width: 12.5rem;
    font-family: var(--sans);
    font-size: 0.78rem;
    line-height: 1.5;
  }
  nav.toc a {
    display: block;
    color: var(--muted);
    text-decoration: none;
    padding: 0.15rem 0;
    border-left: 2px solid transparent;
    padding-left: 0.6rem;
  }
  nav.toc a:hover { color: var(--ink); }
  nav.toc a.active { color: var(--ink); border-left-color: var(--s1); }
  nav.toc a.sub { padding-left: 1.4rem; }
}

/* ---------- footer ---------- */

footer.colophon {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--grid);
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--muted);
}
footer.colophon a { color: var(--ink-2); }

@media (max-width: 40rem) {
  body { font-size: 17px; }
  .machine { font-size: 0.78rem; gap: 0.15rem 0.9rem; }
}

@media print {
  .machine, nav.toc { display: none; }
}