/* butkeraites.com
   Type: an old-style serif for display (the register of a paper), system sans
   for reading, mono with tabular figures wherever a measured number appears —
   because on this site the numbers are the argument. */

:root {
  --bg: #fbfcfb;
  --surface: #ffffff;
  --surface-2: #f1f5f4;
  --ink: #161d21;
  --ink-soft: #48555b;
  --ink-faint: #798890;
  --line: #e2e8e7;
  --line-soft: #eef2f1;
  --accent: #0f4c5c;
  --accent-soft: #e3eef1;
  --accent-ink: #ffffff;

  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 900px;
  --prose: 68ch;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #10161a;
    --surface: #182027;
    --surface-2: #1e282f;
    --ink: #e9eef0;
    --ink-soft: #a8b6bb;
    --ink-faint: #76858c;
    --line: #26333a;
    --line-soft: #1e2930;
    --accent: #7cc6d8;
    --accent-soft: #16303a;
    --accent-ink: #0d1418;
  }
}

:root[data-theme="dark"] {
  --bg: #10161a;
  --surface: #182027;
  --surface-2: #1e282f;
  --ink: #e9eef0;
  --ink-soft: #a8b6bb;
  --ink-faint: #76858c;
  --line: #26333a;
  --line-soft: #1e2930;
  --accent: #7cc6d8;
  --accent-soft: #16303a;
  --accent-ink: #0d1418;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

a { color: var(--accent); text-decoration: none; text-underline-offset: 2px; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-ink); padding: 10px 18px;
}
.skip:focus { left: 0; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.012em; text-wrap: balance; }
h1 { font-size: clamp(32px, 5.5vw, 50px); line-height: 1.1; }
h2 { font-size: clamp(24px, 3.2vw, 30px); line-height: 1.2; }
h3 { font-size: 18.5px; line-height: 1.3; }

code { font-family: var(--mono); font-size: 0.86em; background: var(--surface-2); padding: 1px 5px; border-radius: 2px; }
pre { font-family: var(--mono); font-size: 13.5px; background: var(--surface-2); border: 1px solid var(--line); padding: 16px 18px; overflow-x: auto; border-radius: 3px; }
pre code { background: none; padding: 0; font-size: inherit; }

/* ---------------------------------------------------------------- nav */
nav {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 58px; gap: 20px; }
.brand { font-weight: 650; color: var(--ink); letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; color: var(--accent); }
nav ul { display: flex; gap: 22px; list-style: none; }
nav ul a { color: var(--ink-soft); font-size: 14.5px; font-weight: 500; }
nav ul a:hover { color: var(--accent); text-decoration: none; }
@media (max-width: 620px) { nav ul { display: none; } }

/* --------------------------------------------------------------- hero */
.hero { padding: 84px 0 60px; }
.page-head { padding: 62px 0 34px; border-bottom: 1px solid var(--line); }
.kicker {
  display: inline-block; font-family: var(--mono); font-size: 11.5px; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent);
  background: var(--accent-soft); padding: 5px 12px; border-radius: 999px; margin-bottom: 20px;
}
.lede { font-size: clamp(18px, 2.6vw, 22px); color: var(--ink-soft); margin-top: 18px; max-width: 46ch; }
.lede strong { color: var(--ink); font-weight: 620; }
.summary { font-size: 17px; color: var(--ink-soft); margin-top: 14px; max-width: var(--prose); }

.meta-row { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 26px; font-size: 15px; color: var(--ink-faint); list-style: none; }
.meta-row li::before { content: "·"; color: var(--accent); font-weight: 700; margin-right: 7px; }

.cta-row { display: flex; flex-wrap: wrap; gap: 11px; margin-top: 32px; }
.btn {
  display: inline-block; padding: 11px 21px; border-radius: 7px;
  font-weight: 600; font-size: 15px; border: 1px solid var(--accent);
}
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { opacity: 0.88; text-decoration: none; }
.btn.ghost { color: var(--accent); }
.btn.ghost:hover { background: var(--accent-soft); text-decoration: none; }

.crumbs { font-size: 14px; color: var(--ink-faint); margin-bottom: 16px; }
.crumbs span { margin: 0 6px; }

/* ------------------------------------------------------------ sections */
section { padding: 56px 0; border-top: 1px solid var(--line); }
section:first-of-type { border-top: none; }
h2 + .section-sub { margin-top: 7px; }
.section-sub { color: var(--ink-faint); font-size: 15.5px; margin-bottom: 32px; max-width: 58ch; }

/* --------------------------------------------------------------- cards */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 700px) { .cards { grid-template-columns: 1fr; } }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
  padding: 24px; display: flex; flex-direction: column; gap: 10px;
}
.card .org {
  font-family: var(--mono); font-size: 11px; font-weight: 600; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.07em;
}
.card h3 a { color: inherit; }
.card h3 a:hover { color: var(--accent); text-decoration: none; }
.card p { font-size: 15px; color: var(--ink-soft); }
.card .stat { font-size: 14.5px; color: var(--ink); font-variant-numeric: tabular-nums; }
.card .stat strong { font-family: var(--mono); font-weight: 600; }
.demo-card { border-color: color-mix(in srgb, var(--accent) 34%, var(--line)); }

.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; padding-top: 8px; list-style: none; }
.tags li {
  font-size: 11.5px; font-family: var(--mono); color: var(--ink-faint);
  border: 1px solid var(--line); border-radius: 999px; padding: 2px 9px;
}

/* ------------------------------------------------------------ timeline */
.timeline { list-style: none; }
.timeline li {
  display: grid; grid-template-columns: 118px 1fr; gap: 20px;
  padding: 17px 0; border-bottom: 1px solid var(--line-soft);
}
.timeline li:last-child { border-bottom: none; }
.timeline .when { font-family: var(--mono); font-size: 13px; color: var(--ink-faint); font-variant-numeric: tabular-nums; padding-top: 3px; }
.timeline .role { font-family: var(--sans); font-size: 16.5px; font-weight: 620; }
.timeline .org2 { color: var(--accent); font-weight: 500; }
.timeline .desc { font-size: 15px; color: var(--ink-soft); margin-top: 4px; }
@media (max-width: 560px) { .timeline li { grid-template-columns: 1fr; gap: 3px; } }

/* --------------------------------------------------------------- pubs */
.pubs { list-style: none; display: flex; flex-direction: column; gap: 20px; }
.pubs li { padding-left: 18px; border-left: 3px solid var(--accent); }
.pub-title { font-weight: 620; font-size: 16.5px; }
.pub-venue { font-size: 14.5px; color: var(--ink-faint); margin-top: 2px; }
.doi { font-family: var(--mono); font-size: 13px; }

/* --------------------------------------------------------------- about */
.about-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 40px; align-items: start; }
@media (max-width: 760px) { .about-grid { grid-template-columns: 1fr; gap: 28px; } }
.prose { max-width: var(--prose); }
.prose > * + * { margin-top: 16px; }
.prose p { color: var(--ink-soft); }
.prose strong { color: var(--ink); font-weight: 620; }
.prose h2 { margin-top: 34px; }
.prose h3 { margin-top: 26px; }
.prose ul, .prose ol { padding-left: 22px; color: var(--ink-soft); }
.prose li + li { margin-top: 6px; }
.prose blockquote {
  border-left: 3px solid var(--accent); padding-left: 16px;
  color: var(--ink); font-size: 17.5px;
}

.facts { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 22px; }
.facts h3 { font-family: var(--mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-faint); margin-bottom: 14px; font-weight: 600; }
.facts dl { display: flex; flex-direction: column; gap: 11px; font-size: 14.5px; }
.facts dt { font-weight: 620; font-size: 13px; color: var(--ink); }
.facts dd { color: var(--ink-soft); }

/* ------------------------------------------------------- project pages */
.factbar {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px; background: var(--line); border: 1px solid var(--line);
  border-radius: 8px; overflow: hidden; margin-bottom: 32px;
}
.factbar > div { background: var(--surface); padding: 14px 16px; }
.factbar dt { font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.09em; color: var(--ink-faint); }
.factbar dd { font-size: 14.5px; margin-top: 4px; }

.metrics { margin-bottom: 32px; overflow-x: auto; }
.metrics table { border-collapse: collapse; width: 100%; font-size: 15px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; }
.metrics caption { text-align: left; font-size: 13px; color: var(--ink-faint); padding-bottom: 9px; }
.metrics th, .metrics td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--line-soft); }
.metrics thead th { font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.09em; color: var(--ink-faint); font-weight: 600; }
.metrics tbody tr:last-child th, .metrics tbody tr:last-child td { border-bottom: none; }
.metrics tbody th { font-weight: 500; color: var(--ink-soft); }
.metrics .num { font-family: var(--mono); font-variant-numeric: tabular-nums; color: var(--ink); }

.demo-mount { margin-bottom: 34px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); overflow: hidden; }
.demo-mount figcaption { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.09em; color: var(--ink-faint); padding: 11px 16px; border-bottom: 1px solid var(--line-soft); }
#demo-root { padding: 20px; min-height: 80px; }
.note { font-size: 15px; color: var(--ink-soft); }

/* -------------------------------------------------------------- footer */
footer { border-top: 1px solid var(--line); padding: 52px 0 68px; margin-top: 20px; }
footer .lede { margin-top: 12px; max-width: 62ch; font-size: 17px; }
footer .links { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 24px; font-size: 15px; }
footer .machine { margin-top: 26px; font-size: 14px; color: var(--ink-faint); max-width: 60ch; }
footer .fine { margin-top: 22px; font-size: 13px; color: var(--ink-faint); }