/* TRACE project page. One foreground and one background per theme, hairlines,
 * pills, and a single teal accent taken from the TRACE figures. */

:root {
  --bg: #050505; --bg-2: #0F0F0F;
  --fg: #F4F4F4; --fg-2: #A8A8A8; --fg-3: #7E7E7E;
  --line: rgba(255,255,255,.1); --line-2: rgba(255,255,255,.22);
  --hover: rgba(255,255,255,.045);
  --accent: #5FD3AE; --accent-ink: #04140E; --accent-soft: rgba(95,211,174,.14);
  --bad: #F2849A;
  --plate: #F2F2F2; --fig-filter: brightness(.94);
  --diagram-filter: invert(1) hue-rotate(180deg); --diagram-line: transparent;
  --logo-filter: brightness(0) invert(1) opacity(.85);
  --sans: "Atkinson Hyperlegible Next", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Atkinson Hyperlegible Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --gutter: clamp(16px, 5vw, 56px);
  --max: 1200px;
  --ease: cubic-bezier(.16,1,.3,1);
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #E8E8E8; --bg-2: #F0F0F0;
  --fg: #161616; --fg-2: #404040; --fg-3: #5C5C5C;
  --line: rgba(0,0,0,.1); --line-2: rgba(0,0,0,.22);
  --hover: rgba(0,0,0,.035);
  --accent: #0E7F5E; --accent-ink: #FFFFFF; --accent-soft: rgba(14,127,94,.1);
  --bad: #B8314F;
  --plate: #F7F7F7; --fig-filter: none;
  --diagram-filter: none; --diagram-line: var(--line);
  --logo-filter: none;
  color-scheme: light;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #E8E8E8; --bg-2: #F0F0F0; --fg: #161616; --fg-2: #404040; --fg-3: #5C5C5C;
    --line: rgba(0,0,0,.1); --line-2: rgba(0,0,0,.22); --hover: rgba(0,0,0,.035);
    --accent: #0E7F5E; --accent-ink: #FFFFFF; --accent-soft: rgba(14,127,94,.1);
    --bad: #B8314F; --plate: #F7F7F7; --fig-filter: none; --diagram-filter: none; --diagram-line: var(--line); --logo-filter: none; color-scheme: light;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 400 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: clip;
  transition: background-color 400ms var(--ease), color 400ms var(--ease);
}
::selection { background: var(--accent); color: var(--accent-ink); }
a { color: inherit; text-decoration-color: var(--line-2); text-underline-offset: .2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-color: var(--accent); }
:focus-visible { outline: 1.5px solid var(--fg); outline-offset: 3px; border-radius: 2px; }
strong { font-weight: 600; color: var(--fg); }
h1, h2, h3 { text-wrap: balance; margin: 0; }
p { margin: 0; }
sup { font: 400 .68em/0 var(--mono); color: var(--fg-3); margin-left: 1px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.skip { position: absolute; left: 12px; top: -48px; z-index: 50; padding: 8px 14px; background: var(--fg); color: var(--bg); border-radius: 6px; }
.skip:focus { top: 12px; }

/* Nav */
.nav { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.nav__in { display: flex; align-items: center; gap: 24px; height: 56px; }
.nav__brand { font-weight: 700; text-decoration: none; letter-spacing: -.01em; }
.nav__links { display: flex; gap: 22px; margin-left: auto; font-size: 14px; color: var(--fg-2); }
.nav__links a { text-decoration: none; }
.nav__links a:hover { color: var(--fg); }
.icon-btn { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--line-2); background: none; color: var(--fg); cursor: pointer; }
.icon-btn:hover { background: var(--hover); }
.icon-btn svg { width: 16px; height: 16px; }
.i-sun { display: none; }
:root[data-theme="light"] .i-sun { display: block; }
:root[data-theme="light"] .i-moon { display: none; }
@media (prefers-color-scheme: light) { :root:not([data-theme="dark"]) .i-sun { display: block; } :root:not([data-theme="dark"]) .i-moon { display: none; } }
@media (max-width: 720px) { .nav__links { display: none; } .nav__in > .icon-btn { margin-left: auto; } }

/* Intro */
.intro { padding-top: clamp(24px, 4vh, 48px); }
.title { font-size: clamp(1.9rem, 3.6vw, 2.9rem); line-height: 1.05; font-weight: 300; letter-spacing: -.024em; margin-bottom: 18px; }
.title b { font-weight: 500; }
.authors { display: flex; flex-wrap: wrap; gap: 4px 20px; font-size: 16px; }
.authors a { text-decoration-color: var(--line-2); }
.affil { margin-top: 8px; font-size: 13.5px; color: var(--fg-2); display: flex; flex-wrap: wrap; gap: 2px 18px; }
.venue { display: flex; align-items: center; gap: 10px; margin-top: 18px; font-size: 13.5px; color: var(--fg); }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px; background: var(--accent); color: var(--accent-ink); font-weight: 600; font-size: 13.5px; }
.btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.btn { display: inline-flex; align-items: center; gap: 8px; height: 38px; padding: 0 18px; border-radius: 999px; border: 1px solid var(--line-2); text-decoration: none; font-size: 13.5px; font-weight: 500; transition: background 200ms; }
.btn:hover { background: var(--hover); }
.btn svg { width: 14px; height: 14px; color: var(--accent); }

/* Logo row above the title; monochrome in dark mode so colored marks stay legible */
.logos { display: flex; align-items: center; justify-content: space-between; gap: 22px; margin-bottom: 20px; }
.logos__orgs { display: flex; align-items: center; gap: 18px; }
.logos a { display: block; line-height: 0; }
.logos img { height: 28px; width: auto; filter: var(--logo-filter); }
.logos .logos__neurips { height: 44px; }
.logos .logos__seal { filter: none; }

/* Sections */
.section { padding-top: clamp(56px, 7vw, 88px); }
.hero { padding-top: clamp(24px, 3vh, 36px); }
.section__head { max-width: 640px; margin-bottom: 28px; }
.kicker { font: 500 12px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
.section h2 { font-size: clamp(1.6rem, 2.6vw, 2.1rem); line-height: 1.1; font-weight: 300; letter-spacing: -.02em; }
.section__head p { margin-top: 10px; color: var(--fg-2); font-size: 15.5px; }
.fig { margin: 0; }
.fig__plate { background: var(--plate); border-radius: 14px; padding: clamp(12px, 2.4vw, 28px); border: 1px solid var(--line); }
.fig__plate--diagram { background: #FAFAFA; border-color: var(--diagram-line); filter: var(--diagram-filter); }
.fig__plate img { display: block; width: 100%; height: auto; filter: var(--fig-filter); }
.fig__plate--diagram img { filter: none; }
.fig figcaption { margin-top: 12px; font-size: 14px; color: var(--fg-3); max-width: 820px; }
.split { display: grid; grid-template-columns: 1.9fr 1fr; gap: 20px; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } .split > :last-child { width: 100%; max-width: 380px; justify-self: center; } }

/* Frame grids: real tiles, labels in page text so they follow the theme */
.frames { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; padding: clamp(10px, 2vw, 20px); background: var(--bg-2); }
.frames__row { display: grid; grid-template-columns: 92px repeat(8, minmax(56px, 1fr)); gap: 6px; min-width: 600px; }
.frames__row + .frames__row { margin-top: 6px; }
.frames__row img { display: block; width: 100%; height: auto; aspect-ratio: 1; border-radius: 4px; }
.frames__head span { display: flex; flex-direction: column; gap: 2px; padding-bottom: 4px; font: 400 11.5px/1.2 var(--mono); color: var(--fg-3); text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.frames__head b { font-weight: 500; color: var(--fg-2); }
.frames__label { display: flex; align-items: center; font-size: 13px; font-weight: 500; color: var(--fg-2); line-height: 1.25; }

/* Abstract */
.abstract { max-width: 820px; }
.abstract p { color: var(--fg-2); font-size: 15.5px; line-height: 1.7; }
.abstract p + p { margin-top: 16px; }

/* Stat row */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stat { padding: 24px 20px 22px 0; }
.stat + .stat { padding-left: 20px; border-left: 1px solid var(--line); }
.stat__v { font: 400 clamp(26px, 3vw, 34px)/1.2 var(--mono); font-variant-numeric: tabular-nums; }
.stat__v small { font: 400 .5em var(--sans); color: var(--fg-2); margin-left: 3px; }
.stat__l { margin-top: 4px; font-size: 14px; color: var(--fg-2); }
@media (max-width: 720px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(3) { padding-left: 0; border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--line); }
}

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.card { border: 1px solid var(--line); border-radius: 14px; padding: 22px; background: var(--bg-2); }
.card h3 { font-size: 17px; font-weight: 600; }
.card p { margin-top: 8px; font-size: 15px; color: var(--fg-2); }
.card .kicker { margin-bottom: 10px; }

/* Tables */
.tabs { display: inline-flex; gap: 4px; padding: 4px; border: 1px solid var(--line); border-radius: 999px; margin-bottom: 16px; }
.tabs button { font: 500 14px/1 var(--sans); color: var(--fg-2); background: none; border: 0; padding: 8px 16px; border-radius: 999px; cursor: pointer; }
.tabs button[aria-selected="true"] { background: var(--fg); color: var(--bg); }
.tbl { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; font-variant-numeric: tabular-nums; }
th, td { padding: 11px 16px; text-align: right; white-space: nowrap; border-bottom: 1px solid var(--line); }
th:first-child, td:first-child { text-align: left; }
td:not(:first-child) { font: 400 13.5px/1.4 var(--mono); }
th { font-weight: 500; color: var(--fg-3); font-size: 13px; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: var(--hover); }
tr.ours td { background: var(--accent-soft); }
tr.ours td:first-child { font-weight: 700; color: var(--accent); }
tr.group td { color: var(--fg-3); font: 600 13px/1 var(--sans); padding-top: 16px; }
td.best { font-weight: 500; color: var(--fg); }
td.drop { color: var(--bad); }
td.ok { color: var(--accent); }
.note { margin-top: 12px; font-size: 14px; color: var(--fg-3); max-width: 820px; }

/* Cite */
.cite { display: grid; gap: 16px; }
pre { margin: 0; padding: 22px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg-2); font: 400 13px/1.65 var(--mono); color: var(--fg-2); white-space: pre-wrap; overflow-wrap: anywhere; }
.cite__row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; font-size: 14px; color: var(--fg-3); }
button.btn { background: none; color: var(--fg); cursor: pointer; font-family: inherit; }

/* Footer */
.foot { margin-top: clamp(64px, 9vw, 112px); border-top: 1px solid var(--line); padding: 32px 0 48px; font-size: 14px; color: var(--fg-3); }
.foot__grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
.foot__links { display: flex; flex-wrap: wrap; gap: 20px; }
.foot a { text-decoration: none; }
.foot a:hover { color: var(--fg); }

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }