:root {
  --sapphire-l: #D6E3F8; --aquamarine-l: #D4EDE8; --aquamarine-s: #1B6B5A;
  --taaffeite-l: #E8D5ED; --taaffeite-s: #6B4670; --amber: #f58518;
  --s-trinity: #f58518; --s-flow: #1f77b4; --s-chip: #2ca02c; --s-macro: #9467bd; --s-diff: #e377c2; --s-plain: #8A8480;
  --bg: #F7F5F2; --surface: #FFFFFF; --surface-alt: #EFECE7; --line: #E0DBD4;
  --fg: #2A2724; --fg-soft: #4A4540; --muted: #6A645F; --grid: #E0DBD4;
  --plate: #FFFFFF; --plate-line: #E0DBD4; --bad: #C8423A;
  --link: #5A4FCF; --btn: #2A2724; --btn-fg: #F7F5F2; --trinity: #c85200;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, Consolas, monospace;
  --font-math: "STIX Two Text", "Cambria Math", "Times New Roman", serif;
  font-size: 16px;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  color-scheme: light dark;
}
@media screen and (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141414; --surface: #1F1F1F; --surface-alt: #292929; --line: #363636;
    --fg: #E8E8E8; --fg-soft: #CCCCCC; --muted: #B3B3B3; --grid: #363636;
    --plate: #FBFAF8; --plate-line: #363636; --bad: #E8776B;
    --link: #A99FF0; --btn: #E8E8E8; --btn-fg: #141414; --trinity: #f58518;
    --s-trinity: #f58518; --s-flow: #1f77b4; --s-chip: #2ca02c; --s-macro: #9467bd; --s-diff: #e377c2; --s-plain: #A09A92;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #141414; --surface: #1F1F1F; --surface-alt: #292929; --line: #363636;
  --fg: #E8E8E8; --fg-soft: #CCCCCC; --muted: #B3B3B3; --grid: #363636;
  --plate: #FBFAF8; --plate-line: #363636; --bad: #E8776B;
  --link: #A99FF0; --btn: #E8E8E8; --btn-fg: #141414; --trinity: #f58518;
  --s-trinity: #f58518; --s-flow: #1f77b4; --s-chip: #2ca02c; --s-macro: #9467bd; --s-diff: #e377c2; --s-plain: #A09A92;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { background: var(--bg); color: var(--fg); font-family: var(--font-sans); font-size: 0.9375rem; line-height: 1.75; padding-inline: clamp(16px, 4vw, 48px); padding-block: 0 3rem; }
a { color: var(--link); text-underline-offset: 3px; }
h1, h2, h3 { text-wrap: balance; margin: 0; line-height: 1.3; font-weight: 650; letter-spacing: -0.025em; }
strong, b { font-weight: 600; }
p { margin: 0; }
.container { max-width: 68rem; margin-inline: auto; }
.text { display: grid; gap: 1rem; color: var(--fg-soft); }
.text strong { color: var(--fg); }

.hero { text-align: center; padding-block: 3.5rem 2rem; display: grid; gap: 1.2rem; justify-items: center; }
.hero h1 { font-size: clamp(1.625rem, 3vw, 2rem); }
.hero h1 .name { color: var(--trinity); }
.hero .pitch { font-size: 1rem; color: var(--fg-soft); }
.authors { font-size: 0.875rem; display: grid; gap: 0.2rem; }
.authors .aff { color: var(--muted); font-size: 0.8125rem; }
.authors .au { white-space: nowrap; }
.authors .m { font-size: smaller; vertical-align: middle; margin-left: 0.06em; }
.authors .mk { display: inline-flex; flex-direction: column; vertical-align: middle; font-size: smaller; line-height: 1; text-align: left; margin-left: 0.08em; }
.links { display: flex; gap: 0.6rem; flex-wrap: wrap; justify-content: center; }
.btn { display: inline-flex; align-items: center; padding: 0.45rem 0.9rem; border-radius: 999px; font-weight: 500; font-size: 0.8125rem; text-decoration: none; background: var(--btn); color: var(--btn-fg); border: none; cursor: pointer; font-family: inherit; }
.btn[aria-disabled="true"] { opacity: 0.5; cursor: default; }

figure { margin: 0; display: grid; gap: 0.7rem; }
.plate { background: var(--plate); border: 1px solid var(--plate-line); border-radius: 0.6rem; padding: clamp(0.4rem, 1.4vw, 1rem); overflow-x: auto; }
.plate img, .plate video { display: block; width: 100%; height: auto; }
figcaption { font-size: 0.8125rem; color: var(--muted); }

main { display: grid; gap: 5.5rem; margin-top: 1rem; }
section { display: grid; gap: 1.8rem; }
.kicker { font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
section > h2 { font-size: 1.6rem; letter-spacing: -0.035em; margin-top: -1.2rem; }
h3 { font-size: 1.04rem; line-height: 1.5; letter-spacing: -0.015em; }

.split { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 2rem; align-items: center; }
.legend-list { display: grid; gap: 0.7rem; margin: 0; padding: 0; list-style: none; color: var(--fg-soft); }
.legend-list li { display: grid; grid-template-columns: 1.2rem minmax(0, 1fr); gap: 0.7rem; align-items: start; }
.sw { width: 1.2rem; height: 1.2rem; border-radius: 3px; border: 1px solid #2A2724; margin-top: 0.25rem; }
.legend-list b { color: var(--fg); }
.group-head { display: block !important; font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-top: 0.4rem; }

.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.1rem; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 0.8rem; padding: 1.3rem 1.4rem; display: grid; gap: 0.6rem; align-content: start; }
.card p { color: var(--fg-soft); font-size: 0.9375rem; }
.tag { justify-self: start; font-family: var(--font-mono); font-size: 0.78rem; font-weight: 600; padding: 0.12rem 0.65rem; border-radius: 999px; }
.tag.train { background: var(--sapphire-l); color: #082567; }
.tag.refine { background: var(--aquamarine-l); color: var(--aquamarine-s); }
.tag.score { background: var(--taaffeite-l); color: var(--taaffeite-s); }

/* math */
.math { font-family: var(--font-math); font-size: 1rem; color: var(--fg); background: var(--surface); border: 1px solid var(--line); border-radius: 0.8rem; padding: 1.1rem 1.4rem; display: grid; gap: 0.8rem; overflow-x: auto; }
.math .eq { display: flex; align-items: center; justify-content: center; gap: 0.4em; white-space: nowrap; }
.math .note { font-family: var(--font-sans); font-size: 0.8125rem; color: var(--muted); text-align: center; }
.m { font-family: var(--font-math); font-style: italic; font-size: 1.08em; }
.frac { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; font-size: 0.9em; }
.frac > span:first-child { border-bottom: 1px solid currentColor; padding: 0 0.2em; }
.hl { color: var(--trinity); }

/* toy diffusion */
.toy { background: var(--surface); border: 1px solid var(--line); border-radius: 0.8rem; padding: clamp(0.8rem, 2vw, 1.4rem); display: grid; gap: 1.1rem; }
.toy > h3 { font-size: 1.04rem; }
.toy-story { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.1rem; }
.toy-story > div { display: grid; gap: 0.35rem; align-content: start; }
.toy-story p { font-size: 0.875rem; color: var(--fg-soft); }
.toy-story b { color: var(--fg); font-family: var(--font-mono); font-size: 0.9em; }
.toy-step { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.toy-data canvas { width: 100%; height: auto; aspect-ratio: 4; background: var(--surface-alt); border-radius: 0.5rem; display: block; }
.toy-ctl { display: flex; flex-wrap: wrap; gap: 0.6rem 1.4rem; align-items: center; }
.seg { display: flex; flex-wrap: wrap; gap: 0.35rem; align-items: center; font-size: 0.88rem; color: var(--muted); }
.seg > span:first-child { font-family: var(--font-mono); margin-right: 0.2rem; }
.seg .in, .seg .out { font-family: var(--font-mono); font-size: 0.72rem; padding: 0.05rem 0.45rem; border-radius: 999px; }
.seg .in { background: var(--aquamarine-l); color: var(--aquamarine-s); }
.seg .out { background: var(--taaffeite-l); color: var(--taaffeite-s); }
.toy button { font-family: var(--font-mono); font-size: 0.85rem; padding: 0.3rem 0.85rem; border-radius: 999px; border: 1px solid var(--line); background: var(--surface-alt); color: var(--fg-soft); cursor: pointer; }
.toy button[aria-pressed="true"] { background: var(--amber); border-color: var(--amber); color: #1A1816; font-weight: 600; }
.toy-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.toy-panel { display: grid; gap: 0.4rem; align-content: start; }
.toy-panel h3 { font-size: 1rem; }
.toy-panel canvas { width: 100%; height: auto; aspect-ratio: 1.5; background: var(--surface-alt); border-radius: 0.5rem; display: block; }
.toy .readout { font-family: var(--font-mono); font-size: 0.82rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.toy-panel .readout { min-height: 2.6em; }
.toy .chart { border: none; padding: 0; background: none; }

.cmp { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.cmp-col { background: var(--surface); border: 1px solid var(--line); border-radius: 0.8rem; padding: 1.1rem 1.3rem; display: grid; gap: 0.5rem; align-content: start; color: var(--fg); }
.cmp-col .muted { color: var(--muted); font-size: 0.875rem; }
.gsrc2 { display: grid; gap: 1.5rem; }
.gsrc-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.gsrc-row .gn { grid-column: 1 / -1; font-family: var(--font-mono); font-size: 0.85rem; color: var(--muted); }
.gsrc-row .plate img { max-height: 22rem; width: auto; max-width: 100%; margin-inline: auto; }
.tbl-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: 0.8rem; }
.tbl { width: 100%; border-collapse: collapse; font-size: 0.875rem; font-variant-numeric: tabular-nums; }
.tbl th, .tbl td { padding: 0.55rem 0.75rem; text-align: right; border-bottom: 1px solid var(--line); white-space: nowrap; }
.tbl th { font-weight: 600; color: var(--fg); font-size: 0.85rem; }
.tbl th.grp { text-align: center; }
.tbl td:first-child, .tbl th:first-child { text-align: left; }
.tbl tbody tr:last-child td { border-bottom: none; }
.tbl td { color: var(--fg-soft); font-family: var(--font-mono); font-size: 0.8125rem; }
.tbl td:first-child { font-family: var(--font-sans); font-size: 0.875rem; }
.tbl .b { color: var(--trinity); font-weight: 600; }
.tbl .bad { color: var(--bad); }
.tbl .in, .tbl .out { font-family: var(--font-mono); font-size: 0.72rem; padding: 0.05rem 0.45rem; border-radius: 999px; margin-left: 0.4rem; }
.tbl .in { background: var(--aquamarine-l); color: var(--aquamarine-s); }
.tbl .out { background: var(--taaffeite-l); color: var(--taaffeite-s); }
.tnote { font-size: 0.9rem; color: var(--muted); }
.chart { background: var(--surface); border: 1px solid var(--line); border-radius: 0.8rem; padding: 1rem 1.1rem 0.8rem; display: grid; gap: 0.5rem; }
.chart h3 { font-size: 1.02rem; }
.chart .sub { font-size: 0.88rem; color: var(--muted); }
.chart svg { width: 100%; height: auto; display: block; overflow: visible; }
.chart text { fill: var(--muted); font-family: var(--font-mono); font-size: 11px; }
.chart .lbl { fill: var(--fg); font-family: var(--font-sans); font-size: 12px; font-weight: 600; }
.chart .gl { stroke: var(--grid); stroke-width: 1; }
.charts2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.2rem; }

.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: 0.8rem; padding: 1.1rem 1.2rem; display: grid; gap: 0.3rem; align-content: start; }
.stat .num { font-family: var(--font-mono); font-size: 1.5rem; font-weight: 600; color: var(--trinity); line-height: 1.15; }
.stat p { font-size: 0.9rem; color: var(--fg-soft); }

.gsrc { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.gcase { background: var(--surface); border: 1px solid var(--line); border-radius: 0.8rem; padding: 1rem 1.2rem; display: grid; gap: 0.6rem; align-content: start; }
.gcase .n { font-family: var(--font-mono); font-size: 0.85rem; color: var(--muted); }
.fitrow { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr) 3rem; gap: 0.6rem; align-items: center; font-size: 0.9rem; color: var(--fg-soft); }
.fitbar { height: 0.7rem; background: var(--surface-alt); border-radius: 999px; overflow: hidden; }
.fitbar span { display: block; height: 100%; border-radius: 999px; }
.fitrow .v { font-family: var(--font-mono); text-align: right; }
.gcase p { font-size: 0.9rem; color: var(--muted); }

.takeaways { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.1rem; }
.take { border-left: 3px solid var(--amber); padding: 0.2rem 0 0.2rem 1rem; display: grid; gap: 0.4rem; }
.take p { color: var(--fg-soft); }

.cases { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.cases button { font-family: var(--font-mono); font-size: 0.85rem; padding: 0.35rem 0.95rem; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--fg-soft); cursor: pointer; }
.cases button[aria-pressed="true"] { background: var(--amber); border-color: var(--amber); color: #1A1816; font-weight: 600; }

.bib { position: relative; background: var(--surface-alt); border: 1px solid var(--line); border-radius: 0.7rem; }
.bib pre { margin: 0; padding: 1.1rem 1.25rem; overflow-x: auto; font-family: var(--font-mono); font-size: 0.75rem; line-height: 1.65; color: var(--fg-soft); }
.bib button { position: absolute; top: 0.6rem; right: 0.6rem; font-size: 0.8rem; padding: 0.3rem 0.8rem; }
footer { max-width: 68rem; margin: 5rem auto 0; padding-top: 1.2rem; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; font-size: 0.8125rem; color: var(--muted); }

@media (max-width: 900px) {
  .split, .cards, .charts2, .takeaways, .cmp, .gsrc-row, .toy-story { grid-template-columns: minmax(0, 1fr); }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 480px) { .stats { grid-template-columns: minmax(0, 1fr); } }

/* phones: every grid child may shrink below its content, wide content scrolls inside its own box */
main > *, section > *, .split > *, .charts2 > *, .cards > *, .cmp > *, .toy-grid > *, .toy-story > *, .takeaways > *, .stats > *, figure, .plate, .math, .toy, .chart, .tbl-wrap { min-width: 0; }
img, video, canvas, svg { max-width: 100%; }
@media (max-width: 700px) {
  .math { padding: 0.9rem 1rem; }
  .math .eq { white-space: normal; flex-wrap: wrap; justify-content: flex-start; row-gap: 0.2em; }
  .toy-grid { grid-template-columns: minmax(0, 1fr); }
  .hero { padding-block: 2rem 1.2rem; }
}
@media (max-width: 600px) {
  section > h2 { font-size: 1.45rem; }
  .authors { font-size: 0.8125rem; }
  h3 { font-size: 1rem; }
}

/* Local hosting integration; retain the original palette and research layouts. */
.project-topbar { display:flex; align-items:center; justify-content:space-between; gap:1rem; padding-block:1.2rem 0; font-size:.88rem; }
.project-back { display:inline-flex; align-items:center; gap:.5rem; color:var(--fg-soft); text-decoration:none; min-height:44px; }
.project-back svg { width:18px; height:18px; fill:none; stroke:currentColor; stroke-width:1.6; stroke-linecap:round; stroke-linejoin:round; }
.project-status { color:var(--muted); font-family:var(--font-mono); font-size:.78rem; }
.btn:focus-visible, .project-back:focus-visible { outline:2px solid var(--trinity); outline-offset:4px; }
video { aspect-ratio: 1800 / 870; object-fit:contain; background:var(--plate); }
.project-credit { display:flex; flex-wrap:wrap; gap:.35rem 1.1rem; }
.sr-only { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
@media (max-width:480px) { .toy button, .cases button, .bib button { min-height:44px; } .project-topbar { gap:.4rem; } .project-status { font-size:.7rem; } .links .btn { min-height:44px; } }
@media (prefers-reduced-motion:reduce) { *, *::before, *::after { scroll-behavior:auto!important; transition:none!important; } }

#vid-case[data-case="30"] { aspect-ratio: 1800 / 1174; }
#vid-case[data-case="100"] { aspect-ratio: 1800 / 892; }

.tbl-wrap:focus-visible { outline:2px solid var(--trinity); outline-offset:4px; }

@media screen and (prefers-reduced-motion: no-preference) {
  body, a, .card, .math, .toy, .tbl-wrap, .plate, .tag {
    transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease;
  }
}
@media print {
  :root, :root[data-theme] {
    --bg: #ffffff; --surface: #ffffff; --surface-alt: #efece7; --line: #e0dbd4;
    --fg: #2a2724; --fg-soft: #4a4540; --muted: #6a645f; --grid: #e0dbd4;
    --plate: #ffffff; --plate-line: #e0dbd4; --bad: #c8423a;
    --link: #5a4fcf; --btn: #2a2724; --btn-fg: #f7f5f2; --trinity: #c85200;
    --s-plain: #8a8480;
    color-scheme: light;
  }
  *, *::before, *::after { transition: none !important; }
}