/* tokens.css */
:root {
  color-scheme: light;
  --bg: #fafafa;
  --surface: #f0f0f0;
  --surface-strong: #ffffff;
  --ink: #242424;
  --ink-soft: #525252;
  --ink-faint: #686868;
  --line: #dedede;
  --line-strong: #a3a3a3;
  /* Reading and controls use a neutral accent. Data colors encode meaning. */
  --accent: #292929;
  --accent-soft: #e9e9e9;
  --accent-ink: #ffffff;
  --purple: #7452ad;
  --purple-soft: #eee8f6;
  --coral: #b75322;
  --coral-soft: #fae9de;
  --blue: #285bb5;
  --blue-soft: #e7eefb;
  --yellow: #885d00;
  --yellow-soft: #f7edce;
  --danger: #b42330;
  --code-bg: #202020;
  --code-ink: #f2f2f2;
  --shadow: 0 20px 70px rgba(0, 0, 0, 0.10);
  --radius: 8px;
  --serif: "Iowan Old Style", "Songti SC", "STSong", Georgia, serif;
  --sans: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", "Cascadia Code", "Roboto Mono", Menlo, monospace;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #171717;
  --surface: #212121;
  --surface-strong: #262626;
  --ink: #ededed;
  --ink-soft: #c2c2c2;
  --ink-faint: #a3a3a3;
  --line: #383838;
  --line-strong: #707070;
  --accent: #e5e5e5;
  --accent-soft: #333333;
  --accent-ink: #171717;
  --purple: #c2a8f0;
  --purple-soft: #32283f;
  --coral: #ffb38a;
  --coral-soft: #422d23;
  --blue: #9dbbfa;
  --blue-soft: #25334d;
  --yellow: #e4c278;
  --yellow-soft: #3d3421;
  --danger: #ff9aa6;
  --code-bg: #101010;
  --code-ink: #e5e5e5;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

::selection {
  color: var(--accent-ink);
  background: var(--accent);
}

.skip-link {
  position: absolute;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 8px 12px;
  color: var(--surface-strong);
  background: var(--ink);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

/* layout.css */
.site-header {
  position: relative;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 28px;
  align-items: center;
  width: min(1440px, calc(100% - 48px));
  min-height: 78px;
  margin: 0 auto;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  gap: 11px;
  align-items: center;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  width: 29px;
  height: 29px;
  place-items: center;
  color: var(--surface-strong);
  background: var(--ink);
  border-radius: 4px;
  font-family: var(--serif);
  font-size: 17px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  justify-content: center;
}

.site-nav a {
  padding: 8px 12px;
  color: var(--ink-soft);
  border-radius: 7px;
  font-size: 14px;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
  background: var(--surface);
}

.site-nav a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

.theme-toggle {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  padding: 7px 11px;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  font-size: 12px;
}

.theme-toggle:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}

.theme-dot {
  width: 9px;
  height: 9px;
  background: var(--yellow);
  border-radius: 50%;
  box-shadow: 4px -3px 0 -1px var(--surface) inset;
}

main {
  width: min(1440px, calc(100% - 48px));
  margin: 0 auto;
}

.eyebrow,
.micro-label {
  margin: 0;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

/* shared.css */
/* Shared teaching components */
/* A metric's label and value share tracks with their neighbours, including
   wrapped labels and multi-line values. The local grid is a fallback. */
:where(.metric-row, .tokenizer-metrics, .practice-metrics) > div,
:where(.sampling-metrics) > p {
  display: grid;
  grid-template-rows: 1fr auto;
  row-gap: 8px;
  min-width: 0;
}

:where(.metric-row, .tokenizer-metrics, .practice-metrics) > div > :last-child,
:where(.sampling-metrics) > p > strong {
  align-self: start;
  font-variant-numeric: lining-nums tabular-nums;
}

@supports (grid-template-rows: subgrid) {
  :where(.metric-row, .tokenizer-metrics, .practice-metrics) > div,
  :where(.sampling-metrics) > p {
    grid-row: span 2;
    grid-template-rows: subgrid;
  }
}

.page-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.65fr);
  gap: 64px;
  align-items: end;
  padding: 74px 0 54px;
  border-bottom: 1px solid var(--line-strong);
}

.page-intro h1 {
  max-width: 870px;
  margin: 13px 0 19px;
  font-family: var(--serif);
  font-size: 58px;
  font-weight: 500;
  line-height: 1.08;
}

.page-intro .lede {
  max-width: 760px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.75;
}

.intro-aside {
  padding: 19px 0 4px 20px;
  border-left: 2px solid var(--accent);
}

.intro-aside .micro-label {
  margin-bottom: 8px;
}

.intro-aside p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.section.compact {
  margin-top: 28px;
  padding-top: 42px;
}

.section-number {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
}

.inline-code {
  padding: 1px 5px;
  color: var(--ink);
  background: var(--accent-soft);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.9em;
}

code {
  font-family: var(--mono);
}

.callout {
  margin: 24px 0;
  padding: 18px 20px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
}

.callout p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.callout strong {
  color: var(--ink);
}

.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px;
}

.narrow-copy {
  max-width: 780px;
}

.narrow-copy > p {
  color: var(--ink-soft);
  font-size: 15px;
}

.figure-caption {
  margin: 12px 0 0;
  color: var(--ink-faint);
  font-size: 11px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 7px;
  color: var(--ink-soft);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 9px;
  white-space: nowrap;
}

.tag-teal {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: transparent;
}

.tag-coral {
  color: var(--coral);
  background: var(--coral-soft);
  border-color: transparent;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mobile-line-break {
  display: none;
}

/* Cross-page primitives */
.button {
  display: inline-flex;
  min-height: 45px;
  gap: 8px;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 7px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.button:hover {
  border-color: var(--line-strong);
}

.button-primary {
  color: var(--surface-strong);
  background: var(--ink);
  border-color: var(--ink);
}

.button-primary:hover {
  color: var(--surface-strong);
  background: var(--accent);
  border-color: var(--accent);
}

.lab-range {
  display: block;
  margin-top: 19px;
  padding-top: 15px;
  border-top: 1px solid var(--line);
}

.lab-range > span {
  display: block;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 600;
}

.lab-range strong {
  float: right;
  color: var(--accent);
  font-family: var(--mono);
}

.lab-range input {
  width: 100%;
  margin-top: 9px;
  accent-color: var(--accent);
}

.lab-range small {
  display: block;
  color: var(--ink-faint);
  font-size: 9px;
}

.mem-select {
  display: block;
  margin-bottom: 14px;
}

.mem-select span {
  display: block;
  margin-bottom: 5px;
  color: var(--ink-soft);
  font-size: 10px;
  font-weight: 600;
}

.mem-select select {
  width: 100%;
  min-height: 40px;
  padding: 6px 28px 6px 9px;
  color: var(--ink);
  background: var(--surface-strong);
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  font-size: 10px;
}

.deep-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
  text-align: left;
}

.deep-table th {
  padding: 10px 12px;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 500;
}

.deep-table td {
  padding: 13px 12px;
  color: var(--ink-soft);
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.deep-table td strong {
  color: var(--ink);
  font-weight: 600;
}
.page-evidence {
  border-top: 1px solid var(--line);
  margin-top: 36px;
  padding: 24px 0 36px;
  font-size: 14px;
  line-height: 1.8;
  overflow-wrap: anywhere;
}

.page-evidence h2 { font-size: 20px; margin: 0 0 12px; }
.page-evidence > p { max-width: 82ch; color: var(--ink-soft); }
.page-evidence summary { cursor: pointer; padding: 12px 0; font-weight: 600; }
.page-evidence ul { padding-left: 20px; margin: 4px 0 0; }
.page-evidence li { margin-bottom: 14px; }
.page-evidence a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.page-evidence li span { display: block; color: var(--ink-soft); font-size: 13px; }

.experiment-source {
  margin-block: 24px;
  padding: 20px;
  border: 1px solid var(--line);
  background: var(--surface);
  min-width: 0;
  overflow-wrap: anywhere;
}
.experiment-source .step-actions { flex-wrap: wrap; gap: 12px; }
.experiment-source details { margin-top: 16px; }
.experiment-source code { overflow-wrap: anywhere; }

/* reading.css */
/* Reading navigation: neutral structure; domain charts own their data colors. */
.reading-context { display: flex; align-items: center; flex-wrap: wrap; gap: 7px 12px; padding: 12px 0 0; color: var(--ink-faint); font-size: 11px; }
.reading-context > a { margin-left: auto; color: var(--ink-soft); text-underline-offset: 3px; }
.reading-tag { border: 1px solid var(--line); border-radius: 3px; padding: 1px 6px; font-size: 10px; }
.page-intro.guide-intro { grid-template-columns: minmax(0,1fr); max-width: 960px; padding-bottom: 24px; }
.guide-start { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px; margin: 0 0 30px; }
.guide-start > article { padding: 20px; border: 1px solid var(--line-strong); background: var(--surface-strong); }
.guide-start h2 { margin: 0 0 8px; font: 600 20px/1.5 var(--sans); }
.guide-start p { color: var(--ink-soft); font-size: 13px; margin: 8px 0 14px; }
.guide-start-links { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; font-size: 13px; }
.learning-path { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 0; list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line-strong); }
.learning-path > li { display: grid; grid-template-columns: 24px minmax(0,1fr); gap: 10px; padding: 20px 16px 18px 0; border-bottom: 1px solid var(--line); min-width: 0; }
.learning-path-number { color: var(--ink-faint); font: 11px/2 var(--mono); }
.learning-path h3 { margin: 0 0 6px; font: 600 17px/1.5 var(--sans); }
.learning-path h3 a { text-decoration: none; }
.learning-path h3 a:hover { text-decoration: underline; text-underline-offset: 4px; }
.learning-path p { margin: 0; color: var(--ink-soft); font-size: 13px; }
.learning-path-open { grid-column: 2; font-size: 12px; text-underline-offset: 4px; justify-self: start; }
.learning-path-detailed { grid-template-columns: minmax(0,1fr); }
.learning-path-detailed > li { grid-template-columns: 42px minmax(0,1fr); gap: 20px; padding: 25px 0; scroll-margin-top: 110px; }
.learning-path-detailed h3 { font-size: 22px; }
.learning-path-detailed p { margin: 7px 0; font-size: 14px; }
.learning-path-detailed .learning-path-check { border-left: 2px solid var(--line-strong); padding-left: 12px; margin: 12px 0; }
.learning-path-further { display: flex; flex-wrap: wrap; gap: 7px 18px; margin-top: 12px; font-size: 12px; }
.learning-path-further > span { color: var(--ink-faint); }
.learning-path-further a { text-underline-offset: 4px; }
.learning-branches { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 20px; }
.learning-branches > article { border-top: 1px solid var(--line-strong); padding-top: 17px; min-width: 0; }
.learning-branches h3 { font: 600 18px/1.5 var(--sans); margin: 0 0 10px; }
.learning-branches h3 a { text-decoration: none; }
.learning-branches p { font-size: 13px; color: var(--ink-soft); margin: 8px 0; }
.learning-continuation { margin: 38px 0 24px; padding: 22px 0; border-top: 1px solid var(--line-strong); border-bottom: 1px solid var(--line); }
.learning-continuation > div > span { font: 11px var(--mono); color: var(--ink-faint); }
.learning-continuation p { font-size: 14px; margin: 8px 0 15px; }
.learning-continuation-links { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 22px; font-size: 13px; }
.learning-continuation-links a { text-underline-offset: 4px; }
.reading-choice { padding: 16px 18px; margin: 20px 0; border-left: 2px solid var(--line-strong); background: var(--surface); font-size: 14px; }
.reading-choice p { margin: 6px 0; }
.guide-reference summary { cursor: pointer; color: var(--ink-soft); font-size: 13px; margin-bottom: 15px; }
@media (max-width: 1050px) {
  .learning-path { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .learning-path-detailed { grid-template-columns: minmax(0,1fr); }
  .learning-branches { grid-template-columns: minmax(0,1fr); }
}
@media (max-width: 760px) {
  .guide-start, .learning-path { grid-template-columns: minmax(0,1fr); }
  .guide-start > article { padding: 18px; }
  .reading-context { gap: 6px 9px; }
  .reading-context > a { margin-left: 0; }
  .learning-path > li { padding: 17px 0; }
  .learning-path-detailed > li { grid-template-columns: 27px minmax(0,1fr); gap: 12px; }
  .learning-path-detailed h3 { font-size: 20px; }
}

/* frontier.css */
/* Frontier hub and scaling */
.frontier-route-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 17px;
}

.frontier-route-grid > a {
  padding: 22px;
  background: var(--surface);
  border-top: 2px solid var(--accent);
  text-decoration: none;
}

.frontier-route-grid > a:hover {
  background: var(--surface-strong);
}

.frontier-route-grid span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 8px;
}

.frontier-route-grid h3 {
  margin: 13px 0 8px;
  font-family: var(--serif);
  font-size: 25px;
  font-weight: 500;
}

.frontier-route-grid p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 11px;
}

.scaling-budget-lab {
  display: grid;
  grid-template-columns: minmax(265px, 0.62fr) minmax(0, 1.38fr);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.scaling-controls {
  padding: 22px;
  background: var(--surface);
  border-right: 1px solid var(--line);
}

.scaling-controls .lab-range {
  margin-top: 14px;
}

.scaling-output {
  min-width: 0;
  padding: 22px;
  background: var(--surface-strong);
}

.scaling-readout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
}

.scaling-readout div {
  padding: 10px;
  background: var(--surface);
}

.scaling-readout span {
  display: block;
  color: var(--ink-faint);
  font-size: 8px;
}

.scaling-readout strong {
  display: block;
  color: var(--accent);
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 500;
}

.scaling-verdict {
  margin-top: 14px;
  padding: 10px;
  background: var(--yellow-soft);
  border-left: 2px solid var(--yellow);
}

.scaling-verdict span {
  color: var(--yellow);
  font-family: var(--mono);
  font-size: 7px;
}

.scaling-verdict p {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 9px;
}

.scaling-chart {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 12px;
  aspect-ratio: 2 / 1;
}

.scaling-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
}

.scaling-cards article {
  padding: 19px;
  background: var(--surface);
  border-top: 2px solid var(--line-strong);
}

.scaling-cards article > span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 7px;
}

.scaling-cards h3 {
  margin: 10px 0 7px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 500;
}

.scaling-cards p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 9px;
}

.scaling-formula-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.scaling-formula-board > div {
  min-width: 0;
  padding: 20px;
  border-right: 1px solid var(--line);
}

.scaling-formula-board > div:last-child {
  border-right: 0;
}

.scaling-formula-board > div > span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 7px;
}

.scaling-formula-board code {
  display: block;
  margin: 8px 0;
  overflow-wrap: anywhere;
  color: var(--ink);
  font-size: 13px;
}

.scaling-formula-board p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 9px;
}

.scaling-check-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.scaling-check-grid > div {
  padding: 18px;
  background: var(--bg);
}

.scaling-check-grid span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 8px;
}

.scaling-check-grid h3 {
  margin: 8px 0 5px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 500;
}

.scaling-check-grid p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 9px;
}

/* RL post-training */
.reward-source-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.reward-source-tabs button {
  min-height: 62px;
  padding: 9px 13px;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  cursor: pointer;
  font-size: 10px;
  text-align: left;
}

.reward-source-tabs button:last-child {
  border-right: 0;
}

.reward-source-tabs button[aria-pressed="true"] {
  color: var(--surface-strong);
  background: var(--accent);
}

.reward-source-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
  gap: 25px;
  padding: 24px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.reward-source-panel h3 {
  margin: 7px 0 8px;
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 500;
}

.reward-source-panel > div:first-child > p:last-child {
  margin: 0;
  color: var(--ink-soft);
  font-size: 10px;
}

.reward-source-facts {
  border-top: 1px solid var(--line);
}

.reward-source-facts > div {
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.reward-source-facts span {
  color: var(--ink-faint);
  font-size: 8px;
}

.reward-source-facts p {
  margin: 3px 0 0;
  color: var(--ink-soft);
  font-size: 9px;
}

.rl-loop {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.rl-loop > div {
  min-width: 0;
  padding: 17px;
  border-right: 1px solid var(--line);
}

.rl-loop > div:last-child {
  border-right: 0;
}

.rl-loop span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 8px;
}

.rl-loop h3 {
  margin: 8px 0 5px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 500;
}

.rl-loop p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 8px;
}

.rl-algorithm-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

.rl-algorithm-grid article {
  min-width: 0;
  padding: 20px;
  background: var(--surface);
  border-top: 2px solid var(--line-strong);
}

.rl-algorithm-grid article > span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 8px;
}

.rl-algorithm-grid h3 {
  margin: 10px 0 7px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
}

.rl-algorithm-grid code {
  display: block;
  min-height: 48px;
  overflow-wrap: anywhere;
  color: var(--accent);
  font-size: 9px;
}

.rl-algorithm-grid p {
  margin: 9px 0;
  color: var(--ink-soft);
  font-size: 9px;
}

.rl-algorithm-grid strong {
  font-size: 8px;
  font-weight: 500;
}

.reward-model-board {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.reward-model-formula {
  padding: 22px;
  background: var(--surface);
  border-right: 1px solid var(--line);
}

.reward-model-formula > span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 8px;
}

.reward-model-formula code {
  display: block;
  margin: 10px 0;
  overflow-wrap: anywhere;
  color: var(--ink);
  font-size: 11px;
}

.reward-model-formula p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 9px;
}

.reward-model-risks {
  padding: 22px;
  background: var(--surface-strong);
}

.reward-model-risks > div {
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.reward-model-risks span {
  color: var(--coral);
  font-family: var(--mono);
  font-size: 7px;
}

.reward-model-risks p {
  margin: 3px 0 0;
  color: var(--ink-soft);
  font-size: 9px;
}

.reward-hacking-table-wrap {
  overflow-x: auto;
}

.reward-hacking-table {
  min-width: 760px;
}

.rl-eval-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.rl-eval-grid > div {
  padding: 17px;
  background: var(--bg);
}

.rl-eval-grid span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 8px;
}

.rl-eval-grid p {
  margin: 5px 0 0;
  color: var(--ink-soft);
  font-size: 9px;
}

/* Model case studies */
.case-browser {
  display: grid;
  grid-template-columns: minmax(230px, 0.48fr) minmax(0, 1.52fr);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.case-list {
  padding: 13px;
  background: var(--surface);
  border-right: 1px solid var(--line);
}

.case-list button {
  display: grid;
  width: 100%;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 8px;
  padding: 10px 8px;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  text-align: left;
}

.case-list button:hover {
  background: var(--bg);
}

.case-list button[aria-pressed="true"] {
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

.case-list span {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 7px;
}

.case-panel {
  min-width: 0;
  padding: 22px;
  background: var(--surface-strong);
}

.case-head {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  justify-content: space-between;
}

.case-head h3 {
  margin: 7px 0 8px;
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
}

.case-head > div:first-child > p:last-child {
  margin: 0;
  color: var(--ink-soft);
  font-size: 10px;
}

.case-scale {
  min-width: 105px;
  text-align: right;
}

.case-scale span,
.case-scale strong {
  display: block;
}

.case-scale span {
  color: var(--ink-faint);
  font-size: 8px;
}

.case-scale strong {
  color: var(--accent);
  font-family: var(--serif);
  font-size: 27px;
  font-weight: 500;
}

.case-specs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 17px;
  background: var(--line);
}

.case-specs > div {
  padding: 9px;
  background: var(--surface);
}

.case-specs span,
.case-specs strong {
  display: block;
}

.case-specs span {
  color: var(--ink-faint);
  font-size: 7px;
}

.case-specs strong {
  margin-top: 3px;
  overflow-wrap: anywhere;
  color: var(--ink);
  font-size: 9px;
}

.case-insight {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-top: 15px;
  background: var(--line);
}

.case-insight > div {
  padding: 12px;
  background: var(--bg);
}

.case-insight span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 7px;
}

.case-insight p {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 9px;
}

.case-compare-wrap {
  overflow-x: auto;
}

.case-compare-table {
  min-width: 900px;
}

.case-pattern-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}

.case-pattern-grid article {
  padding: 18px;
  background: var(--surface);
  border-top: 2px solid var(--line-strong);
}

.case-pattern-grid span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 8px;
}

.case-pattern-grid h3 {
  margin: 8px 0 5px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 500;
}

.case-pattern-grid p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 9px;
}

.model-reader {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.model-reader > div {
  padding: 17px;
  border-right: 1px solid var(--line);
}

.model-reader > div:nth-child(3n) {
  border-right: 0;
}

.model-reader > div:nth-child(-n+3) {
  border-bottom: 1px solid var(--line);
}

.model-reader span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 7px;
}

.model-reader strong {
  display: block;
  margin-top: 5px;
  font-size: 10px;
}

.model-reader p {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 9px;
}

@media (max-width: 1120px) {
  .frontier-route-grid,
  .scaling-cards,
  .scaling-check-grid,
  .case-pattern-grid {
    grid-template-columns: 1fr 1fr;
  }

  .scaling-budget-lab,
  .reward-source-panel,
  .reward-model-board,
  .case-browser {
    grid-template-columns: 1fr;
  }

  .scaling-controls,
  .reward-model-formula,
  .case-list {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .case-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .rl-loop {
    grid-template-columns: repeat(3, 1fr);
  }

  .rl-loop > div:nth-child(3n) {
    border-right: 0;
  }

  .rl-loop > div:nth-child(-n+3) {
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 760px) {
  .frontier-route-grid,
  .scaling-cards,
  .scaling-check-grid,
  .case-pattern-grid,
  .case-list,
  .rl-algorithm-grid,
  .rl-eval-grid {
    grid-template-columns: 1fr;
  }

  .scaling-controls,
  .scaling-output,
  .reward-model-formula,
  .reward-model-risks,
  .case-panel {
    padding: 17px 13px;
  }

  .reward-source-tabs {
    grid-template-columns: 1fr 1fr;
  }

  .reward-source-tabs button {
    min-height: 52px;
    border-bottom: 1px solid var(--line);
  }

  .reward-source-tabs button:nth-child(2n) {
    border-right: 0;
  }

  .rl-loop {
    grid-template-columns: 1fr;
  }

  .rl-loop > div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .rl-loop > div:last-child {
    border-bottom: 0;
  }

  .reward-source-panel,
  .case-list {
    padding: 17px 13px;
  }

  .case-list button {
    min-height: 44px;
  }

  .case-head {
    display: block;
  }

  .case-scale {
    margin-top: 10px;
    text-align: left;
  }

  .case-specs {
    grid-template-columns: 1fr 1fr;
  }

  .case-insight {
    grid-template-columns: 1fr;
  }

  .scaling-readout {
    grid-template-columns: 1fr;
  }

  .scaling-readout div {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
  }
}

/* modern.css */
.modern-page .concept-strip { display: flex; flex-wrap: wrap; gap: 12px 28px; padding: 18px 0; border-bottom: 1px solid var(--line); font-size: 13px; color: var(--ink-soft); }
.modern-page .concept-strip strong { color: var(--ink); }
.modern-page .section-heading { display: block; max-width: 920px; }
.modern-page .section-heading h2 { margin: 5px 0 8px; }
.modern-page .section-heading p { max-width: 80ch; }
.modern-page .prose { max-width: 860px; }
.modern-page .prose p { font-size: 15px; margin: 14px 0; }
.modern-page .prose a, .modern-page .reading-links a { color: var(--accent); text-underline-offset: 4px; }
.modern-page .reading-links { display: flex; flex-wrap: wrap; gap: 12px 24px; padding: 20px 0; border-top: 1px solid var(--line); font-size: 13px; }
.modern-page .compare-wrap { overflow-x: auto; border-top: 1px solid var(--line-strong); border-bottom: 1px solid var(--line); }
.modern-page table { border-collapse: collapse; width: 100%; min-width: 650px; font-size: 13px; }
.modern-page th { text-align: left; font-size: 12px; background: var(--surface); }
.modern-page td, .modern-page th { padding: 16px 14px; vertical-align: top; border-bottom: 1px solid var(--line); line-height: 1.85; }
.modern-page td:first-child { min-width: 126px; font-weight: 600; }
.modern-page .mechanism-flow { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.modern-page .mechanism-flow > div { padding: 18px 16px; border-right: 1px solid var(--line); }
.modern-page .mechanism-flow > div:last-child { border-right: 0; }
.modern-page .mechanism-flow span { font: 11px var(--mono); color: var(--accent); }
.modern-page .mechanism-flow h3 { margin: 12px 0 8px; font-size: 16px; }
.modern-page .mechanism-flow p { margin: 0; font-size: 13px; color: var(--ink-soft); }
.modern-page .formula-line { display: block; padding: 18px 20px; margin: 18px 0; background: var(--surface); border-left: 3px solid var(--blue); color: var(--ink); font-size: 14px; line-height: 1.9; overflow-wrap: anywhere; }
.modern-page .concept-pairs { display: grid; grid-template-columns: 1fr 1fr; gap: 0 32px; }
.modern-page .concept-pairs > div { border-top: 1px solid var(--line); padding: 20px 0; }
.modern-page .concept-pairs h3 { margin: 0 0 8px; font-size: 17px; }
.modern-page .concept-pairs p { font-size: 14px; color: var(--ink-soft); margin: 0; }
.modern-page .experiment { border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden; background: var(--surface-strong); }
.modern-page .experiment-head { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--line); }
.modern-page .experiment-head h3 { margin: 0; font-size: 16px; }
.modern-page .segmented { display: flex; flex-wrap: wrap; gap: 3px; padding: 3px; background: var(--surface); border: 1px solid var(--line); border-radius: 5px; }
.modern-page .segmented button { border: 0; border-radius: 3px; padding: 8px 13px; background: transparent; color: var(--ink-soft); cursor: pointer; font-size: 12px; }
.modern-page .segmented button[aria-pressed=true] { background: var(--accent); color: var(--surface-strong); }
.modern-page .experiment-body { display: grid; grid-template-columns: minmax(210px,.7fr) minmax(0,1.5fr); }
.modern-page .experiment-controls { padding: 22px; border-right: 1px solid var(--line); background: var(--surface); }
.modern-page .experiment-controls label { display: grid; gap: 8px; font-size: 12px; margin: 0 0 24px; }
.modern-page .experiment-controls label > span { display: flex; justify-content: space-between; gap: 10px; }
.modern-page .experiment-controls output { font-family: var(--mono); color: var(--accent); }
.modern-page input[type=range] { width: 100%; accent-color: var(--accent); }
.modern-page select { min-height: 40px; border: 1px solid var(--line); border-radius: 4px; background: var(--surface-strong); color: var(--ink); padding: 6px 8px; font-size: 13px; width: 100%; }
.modern-page .experiment-view { min-width: 0; padding: 22px; }
.modern-page .experiment-note { margin: 18px 0 0; color: var(--ink-soft); font-size: 13px; }
.modern-page .experiment-caption { border-top: 1px solid var(--line); padding: 13px 20px; margin: 0; font-size: 12px; color: var(--ink-faint); }
.modern-page .metric-row { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 16px; margin: 0 0 20px; }
.modern-page .metric-row > div { border-bottom: 1px solid var(--line); padding: 0 0 14px; min-width: 0; }
.modern-page .metric-row > div > span { display: block; font-size: 11px; color: var(--ink-faint); }
.modern-page .metric-row > div > strong { display: block; font: 500 26px/1.4 var(--mono); color: var(--accent); overflow-wrap: anywhere; }
.modern-page .horizontal-bars { display: grid; gap: 16px; margin: 20px 0; }
.modern-page .bar-row { display: grid; grid-template-columns: 100px minmax(0,1fr) 58px; gap: 12px; align-items: center; font-size: 12px; }
.modern-page .bar-track { height: 12px; background: var(--surface); border-radius: 2px; overflow: hidden; }
.modern-page .bar-track i { height: 100%; display: block; background: var(--accent); transition: width .2s; }
.modern-page .bar-row:nth-child(2) i { background: var(--blue); }
.modern-page .bar-row:nth-child(3) i { background: var(--coral); }
.modern-page .bar-row output { font: 11px var(--mono); text-align: right; }
.modern-page .token-tape { display: flex; flex-wrap: wrap; gap: 7px; min-height: 60px; margin: 22px 0; align-content: start; }
.modern-page .token-tape span { display: grid; place-items: center; min-width: 40px; height: 44px; padding: 0 9px; font: 13px var(--mono); border: 1px solid var(--line); border-radius: 4px; color: var(--ink-faint); background: var(--surface); }
.modern-page .token-tape .accepted { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.modern-page .token-tape .pending { border-color: var(--blue); color: var(--blue); background: var(--blue-soft); }
.modern-page .token-tape .rejected { border-color: var(--coral); color: var(--coral); background: var(--coral-soft); text-decoration: line-through; }
.modern-page .token-tape .corrected { border-color: var(--blue); color: var(--blue); }
.modern-page .step-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 20px; }
.modern-page .step-actions button { font-size: 12px; }
.modern-page button:disabled { opacity: .5; cursor: not-allowed; }
.modern-page .state-log { font-size: 13px; border-left: 2px solid var(--accent); padding: 8px 0 8px 15px; min-height: 70px; }
.modern-page .state-log strong { display: block; margin-bottom: 5px; }
.modern-page canvas { width: 100%; max-width: 336px; aspect-ratio: 1; display: block; margin: 0 auto; border: 1px solid var(--line); border-radius: 4px; }
.modern-page .mini-chart { display: block; width: 100%; aspect-ratio: 2.6; }
.modern-page details { padding: 16px 0; border-bottom: 1px solid var(--line); }
.modern-page details summary { font-size: 15px; font-weight: 600; cursor: pointer; }
.modern-page details p { color: var(--ink-soft); max-width: 85ch; }
.modern-page .assumption { display: inline-block; color: var(--blue); font: 11px var(--mono); }
@media (max-width: 1100px) {
  .modern-page .mechanism-flow { grid-template-columns: 1fr 1fr; }
  .modern-page .experiment-body { grid-template-columns: 1fr; }
  .modern-page .experiment-controls { border-right: 0; border-bottom: 1px solid var(--line); }
}
@media (max-width: 760px) {
  .modern-page .concept-pairs, .modern-page .mechanism-flow { grid-template-columns: 1fr; }
  .modern-page .mechanism-flow > div { border-right: 0; border-bottom: 1px solid var(--line); padding: 16px 0; }
  .modern-page .experiment-head, .modern-page .experiment-controls, .modern-page .experiment-view { padding: 16px; }
  .modern-page .metric-row { gap: 10px; }
  .modern-page .metric-row > div > strong { font-size: 19px; }
  .modern-page .bar-row { grid-template-columns: 80px minmax(0,1fr) 45px; gap: 6px; }
  .modern-page .prose p { font-size: 14px; }
}

/* frontier-workflows.css */
.recipe-record { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 24px; border-block: 1px solid var(--line); padding: 22px 0; }
.recipe-record > div { min-width: 0; }
.recipe-record pre { overflow-x: auto; margin: 0; padding: 18px; background: var(--code-bg); color: var(--code-ink); font-size: 12px; line-height: 1.8; border-radius: 5px; }
.recipe-stages { padding-left: 22px; margin: 0; font-size: 14px; color: var(--ink-soft); }
.recipe-stages li { margin-bottom: 12px; }
.recipe-stages strong { color: var(--ink); }
.modern-page .recipe-controls input[type=number] { width: 100%; min-height: 40px; box-sizing: border-box; padding: 8px; color: var(--ink); background: var(--surface-strong); border: 1px solid var(--line-strong); border-radius: 4px; font: 14px var(--mono); }
.modern-page .experiment-controls .check-control { display: flex; align-items: flex-start; gap: 10px; }
.modern-page .experiment-controls .check-control input { flex: 0 0 16px; width: 16px; height: 16px; accent-color: var(--accent); margin: 3px 0 0; }
.modern-page .experiment-controls .check-control span { display: block; }
.recipe-token-bar { display: flex; width: 100%; height: 28px; overflow: hidden; background: var(--line); border: 1px solid var(--line-strong); }
.recipe-token-bar i { display: block; height: 100%; transition: width .15s; }
.recipe-token-bar i:nth-child(1) { background: var(--blue); }
.recipe-token-bar i:nth-child(2) { background: var(--accent); }
.recipe-token-bar i:nth-child(3) { background: var(--line); }
.recipe-legend { display: flex; flex-wrap: wrap; gap: 18px; margin: 8px 0; color: var(--ink-soft); font-size: 12px; }
.recipe-legend span::before { content: ""; display: inline-block; width: 9px; height: 9px; margin-right: 6px; background: var(--blue); }
.recipe-legend span:nth-child(2)::before { background: var(--accent); }
.recipe-legend span:nth-child(3)::before { background: var(--line-strong); }
.modern-page .compact-metrics { margin-top: 24px; }
.modern-page .compact-metrics strong { font-size: 20px; }
.modern-page .metric-row strong { overflow-wrap: anywhere; }
.modern-page .recipe-account-table { min-width: 0; table-layout: fixed; }
.modern-page .recipe-account-table th:first-child { width: 65%; }
.modern-page .recipe-account-table th, .modern-page .recipe-account-table td { padding: 13px 10px; }
.modern-page .compact-result-table { min-width: 0; }
.modern-page .compact-result-table th, .modern-page .compact-result-table td { padding: 13px 10px; }
.modern-page .compact-result-table td { white-space: nowrap; }
.modern-page .recipe-parameter-stats { grid-template-columns: repeat(2,minmax(0,1fr)); }
.workflow-note { color: var(--ink-soft); font-size: 13px; max-width: 85ch; }
.memory-items { padding: 0; list-style: none; margin: 0; }
.memory-items li { padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 14px; color: var(--ink-soft); }
.memory-items strong { color: var(--ink); }
.stream-row { display: grid; grid-template-columns: 64px minmax(0,1fr); gap: 12px; align-items: center; margin: 12px 0; font-size: 12px; }
.stream-track { height: 22px; background: var(--surface); position: relative; overflow: hidden; }
.stream-track i { position: absolute; display: block; height: 100%; background: var(--accent); }
.stream-row:nth-child(even) .stream-track i { background: var(--blue); }
.source-note { margin: 18px 0; font-size: 12px; color: var(--ink-faint); }
.source-note a { color: var(--accent); }
.architecture-modes { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); border-block: 1px solid var(--line); }
.architecture-modes > div { padding: 20px 16px; border-right: 1px solid var(--line); }
.architecture-modes > div:last-child { border-right: 0; }
.architecture-modes h3 { font: 600 17px var(--sans); margin: 0 0 12px; }
.architecture-modes p { font-size: 13px; color: var(--ink-soft); }
.cache-state { display: flex; flex-wrap: wrap; gap: 8px; font: 12px var(--mono); }
.cache-state span { padding-bottom: 4px; border-bottom: 3px solid var(--blue); }
.cache-state .reuse { border-color: var(--accent); }
.cache-state .local { border-color: var(--coral); }
@media (max-width: 1100px) {
  .modern-page .recipe-controls { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px 14px; }
  .modern-page .recipe-controls label { min-width: 0; margin: 0; align-content: start; }
  .modern-page .recipe-controls label > span { min-height: 36px; }
  .modern-page .recipe-controls .check-control { grid-column: 1 / -1; }
}
@media (max-width: 760px) {
  .recipe-record, .architecture-modes { grid-template-columns: 1fr; }
  .architecture-modes > div { border-right: 0; border-bottom: 1px solid var(--line); padding: 18px 0; }
  .recipe-record pre { font-size: 11px; }
  .modern-page .recipe-budget-stats { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .modern-page .recipe-budget-stats > div:last-child { grid-column: 1 / -1; }
  .modern-page .recipe-budget-stats strong, .modern-page .recipe-parameter-stats strong { white-space: nowrap; font-size: 18px; }
}

/* overrides.css */
/* Keep all newly added utilities inside late-loaded layouts. */
@media (max-width: 760px) {
  .variant-tradeoff,
  .goal-selector,
  .frontier-route-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 1120px) {
  .variant-axes {
    grid-template-columns: repeat(3, 1fr);
  }

  .variant-axes p {
    min-height: 0;
  }

  .variant-browser,
  .goal-result {
    grid-template-columns: 1fr;
  }

  .variant-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .goal-selector {
    grid-template-columns: repeat(3, 1fr);
  }

  .goal-warning {
    grid-column: auto;
  }
}

@media (max-width: 760px) {
  .variant-axes,
  .goal-selector,
  .arch-conclusions,
  .ablation-checklist {
    grid-template-columns: 1fr;
  }

  .variant-list {
    grid-template-columns: 1fr;
  }

  .variant-list button,
  .goal-selector button {
    min-height: 44px;
  }

  .variant-panel,
  .goal-result {
    padding: 17px 13px;
  }

  .variant-tradeoff {
    grid-template-columns: 1fr;
  }
}

/* Final mobile overrides for late-loaded learning modules. */
@media (max-width: 760px) {
  .site-header {
    overflow-x: clip;
  }

  .site-nav {
    width: 100vw;
    min-width: 0;
    max-width: 100vw;
  }

  .site-nav a {
    padding: 7px 4px;
    font-size: 11px;
  }

  .variant-tradeoff {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Global reset and responsive rules recovered from legacy CSS */
[hidden] {
  display: none !important;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
}

@media (max-width: 1120px) {
  .site-header {
    grid-template-columns: auto 1fr;
  }

  .site-nav {
    grid-row: 2;
    grid-column: 1 / -1;
    justify-content: flex-start;
    padding-bottom: 12px;
  }

  .theme-toggle {
    justify-self: end;
  }

  .home-hero {
    grid-template-columns: 1fr;
    gap: 46px;
    min-height: 0;
    padding-top: 62px;
  }

  .hero-copy {
    max-width: 820px;
  }

  .hero-model {
    max-width: 780px;
  }

  .pipeline-stage {
    grid-template-columns: 64px minmax(0, 1fr);
  }

  .pipeline-meta {
    grid-column: 2;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .pipeline-meta div {
    display: block;
  }

  .pipeline-meta code,
  .pipeline-meta strong {
    display: block;
    margin-top: 4px;
    text-align: left;
  }

  .scale-stage {
    grid-template-columns: 150px minmax(0, 1fr);
  }

  .scale-facts {
    grid-column: 2;
  }

  .page-intro {
    gap: 40px;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 15px;
  }

  .site-header,
  main,
  .site-footer {
    width: min(100% - 28px, 1440px);
  }

  .site-header {
    gap: 12px;
    min-height: 64px;
  }

  .brand {
    font-size: 10px;
  }

  .brand-mark {
    width: 26px;
    height: 26px;
  }

  .site-nav {
    flex-wrap: nowrap;
    gap: 0;
    justify-content: flex-start;
    margin-right: -14px;
    margin-left: -14px;
    padding: 0 14px 10px;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .site-nav a {
    display: flex;
    min-height: 40px;
    align-items: center;
    padding: 7px 6px;
    font-size: 12px;
    white-space: nowrap;
  }

  .theme-toggle {
    min-height: 44px;
    padding: 6px 9px;
  }

  .home-hero {
    padding: 44px 0 54px;
  }

  .home-hero h1 {
    font-size: 43px;
    line-height: 1.09;
  }

  .hero-lede {
    font-size: 16px;
  }

  .hero-actions {
    align-items: flex-start;
  }

  .hero-model {
    padding: 17px;
  }

  .hero-model::before {
    right: -9px;
    bottom: -9px;
  }

  .model-header {
    display: block;
  }

  .status-dot {
    margin-top: 8px;
  }

  .lookup-board {
    grid-template-columns: 1fr;
  }

  .lookup-caption {
    flex-direction: row;
    justify-content: space-between;
  }

  .matrix-row {
    grid-template-columns: 72px repeat(4, minmax(30px, 1fr));
    font-size: 9px;
  }

  .model-equation {
    gap: 8px;
  }

  .model-equation span {
    display: none;
  }

  .section {
    margin: 30px 0;
    padding-top: 40px;
  }

  .section-heading,
  .page-intro {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .section-heading h2 {
    font-size: 32px;
  }

  .section-note {
    max-width: 560px;
  }

  .pipeline-controls {
    grid-template-columns: repeat(3, 1fr);
  }

  .pipeline-controls button {
    min-height: 56px;
    justify-content: flex-start;
    border-bottom: 1px solid var(--line);
  }

  .pipeline-controls button:nth-child(3n) {
    border-right: 0;
  }

  .pipeline-controls button:nth-last-child(-n+3) {
    border-bottom: 0;
  }

  .pipeline-stage {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 28px 14px;
  }

  .pipeline-index {
    font-size: 38px;
  }

  .pipeline-meta {
    grid-column: auto;
    grid-template-columns: 1fr;
    gap: 0;
    margin-top: 10px;
  }

  .pipeline-meta div {
    display: flex;
    justify-content: space-between;
  }

  .pipeline-meta code,
  .pipeline-meta strong {
    margin-top: 0;
    text-align: right;
  }

  .scale-switcher {
    grid-template-columns: 1fr;
  }

  .scale-switcher button {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .scale-switcher button:last-child {
    border-bottom: 0;
  }

  .scale-stage {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 24px 0;
  }

  .scale-symbol {
    width: 150px;
    height: 96px;
  }

  .scale-facts {
    grid-column: auto;
  }

  .lesson-row {
    grid-template-columns: 38px minmax(0, 1fr) 28px;
    gap: 10px;
    min-height: 94px;
    padding: 15px 0;
  }

  .lesson-title strong {
    font-size: 21px;
  }

  .lesson-tag {
    display: none;
  }

  .lesson-arrow {
    width: 28px;
    height: 28px;
  }

  .anchor-grid,
  .two-col {
    grid-template-columns: 1fr;
  }

  .anchor-grid article {
    padding: 22px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .anchor-grid article:last-child {
    border-bottom: 0;
  }

  .site-footer {
    display: block;
    margin-top: 56px;
  }

  .site-footer p + p {
    margin-top: 6px;
  }

  .page-intro {
    padding: 46px 0 36px;
  }

  .page-intro h1 {
    font-size: 41px;
  }

  .intro-aside {
    padding-left: 15px;
  }

  .two-col {
    gap: 25px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* wiki.css */
/* Shared Wiki shell and reading rhythm. Loaded after domain modules. */
body { background: var(--bg); }
body * { letter-spacing: 0; }
.accent-text { color: var(--accent); }
.site-header { position: sticky; top: 0; width: 100%; padding: 0 28px; min-height: 66px; gap: 20px; background: var(--surface-strong); border-bottom: 1px solid var(--line); }
.brand { font-family: var(--sans); font-size: 15px; }
.brand-mark { width: 34px; height: 34px; border-radius: 7px; background: var(--accent); color: var(--accent-ink); font: 700 13px var(--mono); }
.brand small { margin-left: 5px; font: 10px var(--mono); color: var(--ink-faint); }
.site-nav { gap: 0; }
.site-nav a { padding: 9px 10px; font-size: 12px; border-radius: 4px; }
.wiki-header-tools { display: flex; align-items: center; gap: 8px; }
.wiki-icon-button { display: inline-flex; align-items: center; justify-content: center; width: 36px; min-width: 36px; height: 36px; min-height: 36px; padding: 0; border: 1px solid var(--line); border-radius: 5px; color: var(--ink-soft); background: transparent; cursor: pointer; text-decoration: none; }
.wiki-icon-button:hover { background: var(--surface); color: var(--accent); }
.wiki-search-button { display: flex; align-items: center; gap: 10px; border: 1px solid var(--line); border-radius: 5px; padding: 7px 14px; background: var(--surface); color: var(--ink-soft); font-size: 12px; cursor: pointer; }
.wiki-menu-button { display: none; }
.wiki-workspace { display: grid; grid-template-columns: 212px minmax(0,1fr); max-width: 1560px; margin: 0 auto; }
.wiki-library { position: sticky; top: 66px; height: calc(100dvh - 66px); overflow-y: auto; padding: 24px 14px 32px 22px; border-right: 1px solid var(--line); scrollbar-width: thin; }
.wiki-library-title { display: flex; justify-content: space-between; align-items: center; margin: 0 9px 24px 5px; font-size: 13px; font-weight: 600; }
.wiki-library-title span { font: 10px var(--mono); color: var(--ink-faint); }
.wiki-nav-group { margin: 0 0 24px; }
.wiki-nav-group h2 { margin: 0 0 7px; padding: 0 7px; font: 600 11px var(--sans); color: var(--ink-faint); }
.wiki-nav-group a { display: block; padding: 6px 9px; margin: 2px 0; text-decoration: none; font-size: 12px; color: var(--ink-soft); border-radius: 4px; border-left: 2px solid transparent; }
.wiki-nav-group a:hover { background: var(--surface); color: var(--ink); }
.wiki-nav-group a[aria-current] { color: var(--accent); border-left-color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.wiki-workspace main { width: 100%; min-width: 0; padding: 0 36px; }
.wiki-breadcrumb { display: flex; align-items: center; gap: 10px; min-height: 57px; border-bottom: 1px solid var(--line); color: var(--ink-faint); font-size: 11px; }
.wiki-breadcrumb a { text-decoration: none; }
.wiki-breadcrumb .wiki-evidence-link { margin-left: auto; color: var(--accent); }
.wiki-toc { margin-top: 18px; border-bottom: 1px solid var(--line); padding-bottom: 12px; }
.wiki-toc summary { cursor: pointer; color: var(--ink-soft); font-size: 12px; }
.wiki-toc summary span { margin-left: 8px; color: var(--ink-faint); font: 10px var(--mono); }
.wiki-toc nav { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px 24px; padding: 16px 0 6px; }
.wiki-toc a { text-decoration: none; font-size: 12px; color: var(--ink-soft); overflow-wrap: anywhere; }
.wiki-toc a:hover, .wiki-toc a[data-current] { color: var(--accent); }
main [role="region"][tabindex="0"]:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
main h2[id], main h3[id], main section[id] { scroll-margin-top: 92px; }
.page-intro { padding: 38px 0 32px; gap: 32px; grid-template-columns: minmax(0,1fr) minmax(220px,.48fr); align-items: start; }
.page-intro h1 { font-family: var(--sans); font-weight: 650; font-size: 36px; line-height: 1.36; margin: 10px 0 18px; text-wrap: balance; }
.page-intro h1 br { display: none; }
.page-intro .lede { font-size: 15px; line-height: 1.95; }
.page-intro .intro-aside { padding: 12px 0 8px 16px; margin-top: 8px; border-left-color: var(--line-strong); }
.intro-aside p { font-size: 12px; line-height: 1.9; }
.eyebrow, .micro-label { font-size: 10px; }
.section, .section.compact { margin: 30px 0 42px; padding-top: 26px; }
.section-heading { gap: 24px; margin-bottom: 24px; }
.section-heading h2 { font-family: var(--sans); font-size: 25px; font-weight: 600; line-height: 1.5; }
.section-heading h2 br { display: none; }
.section-note { font-size: 13px; line-height: 1.8; }
.section-heading h2, .section-heading p { margin-top: 6px; }
.section p, .page-evidence p { line-height: 1.9; }
.section :is(article, details, .callout) p { font-size: 14px; }
.section :is(.figure-caption, .form-help, .scope-caveat) { font-size: 12px; }
.section .callout p + p { margin-top: 12px; }
.section .lab-range small { font-size: 11px; line-height: 1.7; }
.section :is(.lab-range > span, .mem-select span) { font-size: 12px; }
.section .mem-select select { font-size: 12px; }
.section .deep-table :is(td, th) { font-size: 12px; line-height: 1.8; }
.section :is(.case-insight,.case-pattern-grid,.reward-source-panel,.reward-model-board,.rl-loop,.scaling-check-grid,.profile-order,.precision-rules) p { font-size: 13px; }
.section :is(.case-specs,.artifact-facts,.parallel-deep-facts,.prefill-metrics) span { font-size: 11px; }
.section :is(.case-specs,.artifact-facts,.parallel-deep-facts) strong { font-size: 12px; }
.section :is(.math-readouts,.candidate-column,.candidate-labels,.dpo-output,.token-row-header) span { font-size: 10px; }
.section .row-lab-head h3 { font: 600 22px/1.5 var(--sans); }
.section .row-state { font-size: 9px; }
.section :is(.row-lab-copy,.math-explanation,.prefill-note) { font-size: 13px; }
.section .frontier-route-grid span { font-size: 10px; }
.section .frontier-route-grid p { font-size: 13px; }
.frontier-route-grid > a:nth-child(3n+2), .frontier-route-grid > a:nth-child(3n) { border-top-color: var(--line-strong); }
.section :is(.frontier-route-grid,.case-pattern-grid,.scaling-cards) h3 { font: 600 19px/1.5 var(--sans); }
.section :is(.frontier-route-grid,.case-pattern-grid,.scaling-cards) article { border-radius: 6px; }
.button { background: var(--surface-strong); border-radius: 5px; }
.button-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.tag { border-radius: 4px; }
.home-hero { grid-template-columns: minmax(0,1fr); gap: 28px; min-height: 0; padding: 38px 0 30px; }
.home-hero h1 { font: 650 36px/1.4 var(--sans); text-wrap: balance; margin: 10px 0 16px; }
.home-hero h1 br { display: none; }
.home-hero .hero-copy { max-width: 900px; }
.home-hero .hero-lede { font-size: 15px; line-height: 1.9; max-width: 800px; }
.home-hero .hero-actions { margin-top: 20px; gap: 12px; }
.home-hero .hero-model { width: 100%; max-width: none; border-radius: 8px; box-shadow: none; }
.home-hero .hero-model::before { display: none; }
.section .run-lifecycle { grid-template-columns: repeat(4,minmax(0,1fr)); }
.section :is(.engineer-contracts,.engineer-skill-grid) h3 { font: 600 18px/1.5 var(--sans); }
.section :is(.engineer-contracts,.engineer-skill-grid,.run-lifecycle,.problem-detail-grid,.project-questions) p { font-size: 13px; }
.section :is(.engineer-contracts,.engineer-skill-grid,.run-lifecycle,.problem-detail-grid) span { font-size: 10px; }
.section .engineer-contracts strong { font-size: 12px; }
.site-footer { width: min(1280px, calc(100% - 56px)); margin: 40px auto 0; padding: 22px 0 28px; font-size: 12px; }
.site-footer .wiki-icon-button { margin-left: auto; }
.wiki-dialog { width: min(660px,calc(100% - 32px)); max-height: min(80dvh,740px); padding: 0; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-strong); color: var(--ink); box-shadow: var(--shadow); }
.wiki-dialog::backdrop { background: rgba(0,0,0,.45); }
.wiki-dialog-head { position: sticky; top: 0; z-index: 1; display: flex; justify-content: space-between; align-items: center; padding: 16px 22px; background: var(--surface-strong); border-bottom: 1px solid var(--line); }
.wiki-dialog-head strong { font-size: 15px; }
.wiki-search-input { display: flex; align-items: center; margin: 20px 22px 8px; padding: 9px 12px; gap: 10px; border: 1px solid var(--line-strong); border-radius: 5px; }
.wiki-search-input input { width: 100%; min-width: 0; border: 0; color: var(--ink); background: transparent; outline: none; font-size: 15px; }
.wiki-search-input:focus-within { outline: 2px solid var(--accent); }
.wiki-search-status { font-size: 11px; margin: 10px 22px; color: var(--ink-faint); }
.wiki-search-results { padding: 0 14px 18px; }
.wiki-search-results a { display: grid; gap: 4px; padding: 13px 9px; text-decoration: none; border-bottom: 1px solid var(--line); border-radius: 4px; }
.wiki-search-results a:hover { background: var(--accent-soft); }
.wiki-search-results strong { font-size: 14px; }
.wiki-search-results span { font-size: 12px; color: var(--ink-soft); }
.wiki-library-dialog > nav { padding: 22px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.wiki-library-dialog .wiki-nav-group a { min-height: 40px; display: flex; align-items: center; font-size: 13px; }
@media (max-width: 1250px) {
  .site-header { grid-template-columns: auto 1fr; }
  .site-nav { display: none; }
  .wiki-header-tools { justify-self: end; }
  .wiki-workspace { grid-template-columns: 190px minmax(0,1fr); }
  .wiki-workspace main { padding: 0 24px; }
  .wiki-library { padding-left: 12px; }
  .page-intro { grid-template-columns: 1fr; gap: 18px; }
  .intro-aside { max-width: 700px; }
}
@media (max-width: 1050px) {
  .wiki-workspace { display: block; }
  .wiki-library { display: none; }
  .wiki-menu-button { display: inline-flex; }
}
@media (max-width: 760px) {
  .site-header { padding: 0 16px; min-height: 60px; gap: 8px; overflow: visible; }
  .wiki-workspace main { padding: 0 16px; }
  .brand { gap: 8px; font-size: 13px; }
  .brand small { display: none; }
  .wiki-search-button { width: 36px; height: 36px; padding: 7px; }
  .wiki-search-button span { display: none; }
  .wiki-header-tools { gap: 6px; }
  .page-intro { padding: 26px 0; }
  .page-intro h1 { font-size: 28px; }
  .page-intro .lede { font-size: 14px; }
  .section-heading h2 { font-size: 22px; }
  .section, .section.compact { margin: 22px 0 30px; padding-top: 22px; }
  .wiki-breadcrumb { font-size: 10px; gap: 7px; min-height: 48px; }
  .wiki-breadcrumb .wiki-evidence-link { font-size: 10px; }
  .wiki-toc nav { grid-template-columns: 1fr; }
  .wiki-library-dialog > nav { grid-template-columns: 1fr; }
  .site-footer { width: calc(100% - 32px); }
  .home-hero h1 { font-size: 34px; }
  .section .run-lifecycle { grid-template-columns: 1fr 1fr; }
}

/* math.css */
/* KaTeX is rendered during build; no client-side typesetting or CDN. */
.math-block {
  min-width: 0;
  margin: 22px 0;
  padding: 18px 22px;
  border-left: 3px solid var(--blue);
  background: var(--surface);
}
.math-display {
  min-width: 0;
  max-width: 100%;
  padding: 5px 2px;
  overflow-x: auto;
  overflow-y: hidden;
  color: var(--ink);
  font-size: 17px;
}
.math-display .katex-display { margin: .45em 0; text-align: left; }
.math-display .katex-display > .katex { text-align: left; }
.math-inline { font-size: 1em; }
.math-inline .katex { font-size: 1.08em; }
.math-block figcaption,
.math-block > p { margin: 12px 0 0; color: var(--ink-soft); font: 13px/1.9 var(--sans); }
.math-symbols { display: flex; flex-wrap: wrap; gap: 6px 24px; margin: 12px 0 0; }
.math-symbols > div { display: flex; gap: 9px; align-items: baseline; }
.math-symbols dt { color: var(--ink); font-style: italic; }
.math-symbols dd { margin: 0; color: var(--ink-soft); font-size: 13px; }
.math-derivation { margin: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.math-derivation summary { cursor: pointer; padding: 14px 0; font-weight: 600; font-size: 14px; color: var(--ink); }
.math-derivation > p { font-size: 14px; line-height: 1.9; max-width: 85ch; }
.math-derivation .math-block { margin: 12px 0 20px; }
.formula-panel .math-display,
.derivation-step .math-display,
.objective-ledger .math-display { font-size: 15px; }
.gradient-readout [data-math-formula] { min-width: 0; width: 100%; }
.gradient-readout .math-display { font-size: 14px; }
.objective-ledger .math-display { padding: 12px; }
.formula-panel,
.derivation-board,
.dpo-formulas,
.reward-model-board { min-width: 0; }
.formula-panel > div,
.dpo-formulas > div,
.reward-model-formula { min-width: 0; }
.math-principles .math-display { font-size: 15px; }
.metric-formula-grid .math-display { font-size: 14px; }
.math-display:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
.math-layers { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); border-top: 1px solid var(--line); }
.math-layers > div { padding: 18px 20px 18px 0; }
.math-layers h3 { font: 600 16px/1.5 var(--sans); margin: 0 0 8px; }
.math-layers p { font-size: 13px; color: var(--ink-soft); }
@media (max-width: 760px) {
  .math-block { padding: 14px 12px; margin: 18px 0; }
  .math-display { font-size: 15px; }
  .math-symbols { gap: 5px 16px; }
  .math-layers { grid-template-columns: 1fr; }
  .math-layers > div { border-bottom: 1px solid var(--line); }
  .gradient-readout { grid-template-columns: minmax(0,1fr); }
}