/* Color tokens. The accent is the blue of the IFS renders in the Fractal Gallery. */
:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5d636b;
  --rule: #e3e1dc;
  --accent: #0a69a8;
  --accent-soft: #e6f0f8;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --measure: 42rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --surface: #1d2024;
    --text: #e6e6e3;
    --muted: #a0a6ad;
    --rule: #33373d;
    --accent: #6fb4e8;
    --accent-soft: #1d2b38;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
}

main, .site-header nav, .site-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 1rem;
}

main { padding-top: 2rem; padding-bottom: 3rem; }
main.wide { max-width: 64rem; }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.25;
  margin: 2rem 0 0.75rem;
}
h1 { font-size: 2.1rem; margin-top: 0.5rem; }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1rem; }

a { color: var(--accent); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }

hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }

img { max-width: 100%; height: auto; }

.muted { color: var(--muted); }

/* Header / nav */
.site-header { border-bottom: 1px solid var(--rule); }
.site-header nav {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}
.site-name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}
.site-header ul {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-header ul a { color: var(--muted); text-decoration: none; }
.site-header ul a:hover,
.site-header ul a[aria-current="page"] { color: var(--text); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--rule);
  padding-top: 1.5rem;
  padding-bottom: 2.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}
.site-footer .updated { margin: 0.75rem 0 0; }

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Home intro */
.intro {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  margin-bottom: 1.5rem;
}
.intro img {
  width: 112px;
  height: 112px;
  border-radius: 50%;
  flex: none;
}
.intro h1 { margin: 0 0 0.25rem; }
.intro .tagline { margin: 0; color: var(--muted); }
.intro .links { margin-top: 0.5rem; }

.callout {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1rem;
  margin: 1.5rem 0;
}
.callout p:last-child { margin-bottom: 0; }

@media (max-width: 480px) {
  .intro { flex-direction: column; align-items: flex-start; }
}

/* Publications and talks */
.pubs, .talks, .plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.pubs li, .talks li, .plain-list li { margin-bottom: 1rem; }
.pubs .title { font-weight: 600; }
.pubs .meta, .talks .meta, .plain-list .meta {
  display: block;
  color: var(--muted);
  font-size: 0.95rem;
}
.status {
  font-size: 0.8rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0 0.5rem;
  margin-left: 0.25rem;
  white-space: nowrap;
}

/* Project cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(12rem, 1fr));
  gap: 1rem;
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
}
.card a {
  display: block;
  height: 100%;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
  color: var(--text);
  text-decoration: none;
}
.card a:hover { border-color: var(--accent); }
.card img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: #fff;
}
.card .body { padding: 0.75rem; }
.card h3 { margin: 0 0 0.25rem; font-size: 1.05rem; }
.card p { margin: 0; font-size: 0.9rem; color: var(--muted); }

/* Hobby pages */
.back { font-size: 0.95rem; margin-bottom: 1rem; }
figure { margin: 1.5rem 0; text-align: center; }
figure img { display: block; margin: 0 auto; }
figcaption { color: var(--muted); font-size: 0.95rem; margin-top: 0.5rem; }
.narrow { max-width: 60%; }
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
}
.grid-2 figure { margin: 0; }
@media (max-width: 480px) {
  .narrow { max-width: 100%; }
}
.text-center { text-align: center; }
/* Image classes used by the older project pages. */
.center, .centersmall, .centerlarge { display: block; margin: 1rem auto; }
.center { width: 50%; }
.centersmall { width: 25%; }
.centerlarge { width: 80%; }
@media (max-width: 480px) {
  .center, .centersmall { width: 80%; }
  .centerlarge { width: 100%; }
}
.math-display { text-align: center; overflow-x: auto; }