/* AI Agent History — Museum / Research Archive stylesheet
   Goals: clean, fast, fully server-rendered, citation-friendly,
   maximum readability so search engines + readers treat it as a reference. */

:root {
  --ink: #1a1a1a;
  --ink-soft: #2c2c2c;
  --muted: #5a5a5a;
  --rule: #d9d4c7;
  --paper: #faf7f0;
  --paper-deep: #f3ede0;
  --link: #7a4b1c;
  --link-hover: #4a2a0e;
  --accent: #8a3d1e;
  --max: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

header.site {
  border-bottom: 1px solid var(--rule);
  background: var(--paper-deep);
}

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

.brand {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 18px 0 14px;
}

.brand a.logo {
  font-family: "Iowan Old Style", Georgia, serif;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 0;
}

nav.primary {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
}

nav.primary a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

nav.primary a:hover,
nav.primary a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

main {
  padding: 28px 0 60px;
}

.kicker {
  display: inline-block;
  font-family: "Iowan Old Style", Georgia, serif;
  font-variant: small-caps;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  color: var(--muted);
  margin: 8px 0 6px;
}

h1 {
  font-size: 2.2rem;
  line-height: 1.18;
  margin: 6px 0 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.45rem;
  line-height: 1.3;
  margin: 44px 0 12px;
  font-weight: 700;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 6px;
}

h3 {
  font-size: 1.15rem;
  line-height: 1.35;
  margin: 28px 0 6px;
  font-weight: 700;
}

h3 .date {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 2px;
}

p { margin: 0 0 14px; }

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}
a:hover { color: var(--link-hover); border-bottom-color: var(--link-hover); }

ul, ol { padding-left: 22px; margin: 0 0 16px; }
li { margin: 4px 0; }

.contents {
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  padding: 14px 20px 14px 38px;
  margin: 18px 0 28px;
  border-radius: 2px;
}
.contents strong {
  display: block;
  font-variant: small-caps;
  letter-spacing: 0.14em;
  font-size: 0.82rem;
  color: var(--muted);
  margin: -4px 0 6px -16px;
  font-weight: 700;
}

.timeline { list-style: decimal; padding-left: 24px; }
.timeline > li { margin: 26px 0; }
.timeline .refs {
  font-size: 0.92rem;
  color: var(--muted);
  margin-top: 6px;
}
.timeline .refs a { color: var(--muted); }
.timeline .refs a:hover { color: var(--accent); }

.callout {
  border-left: 3px solid var(--accent);
  background: var(--paper-deep);
  padding: 10px 16px;
  margin: 14px 0;
  font-size: 0.97rem;
}

.qualifies { margin: 8px 0 0 0; padding-left: 20px; }
.qualifies li { margin: 3px 0; }

table.funding {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0 22px;
  font-size: 0.94rem;
}
table.funding th, table.funding td {
  border-bottom: 1px solid var(--rule);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
table.funding th {
  background: var(--paper-deep);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.bibliography { padding-left: 24px; font-size: 0.97rem; }
.bibliography li { margin: 8px 0; }
.bibliography a { word-break: break-word; }

dl.faq dt {
  font-weight: 700;
  margin-top: 22px;
  font-size: 1.05rem;
}
dl.faq dd { margin: 6px 0 0; }

.last-updated {
  font-size: 0.9rem;
  color: var(--muted);
  font-style: italic;
  margin: -8px 0 18px;
}

.cta {
  display: inline-block;
  margin-top: 6px;
  font-weight: 700;
  border-bottom: 1px solid var(--accent);
  color: var(--accent);
}
.cta:hover { color: var(--link-hover); border-bottom-color: var(--link-hover); }

footer.site {
  border-top: 1px solid var(--rule);
  background: var(--paper-deep);
  padding: 22px 0;
  font-size: 0.92rem;
  color: var(--muted);
  margin-top: 40px;
}
footer.site .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
footer.site a { color: var(--muted); }

hr.section {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 36px 0;
}

@media (max-width: 600px) {
  body { font-size: 17px; }
  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.25rem; }
  .brand { flex-direction: column; align-items: flex-start; }
  nav.primary { gap: 14px; flex-wrap: wrap; }
}