/* ------------------------------------------------------------------
   Steven Hoekstra — academic site
   Plain CSS, no build step. Edit freely.
   ------------------------------------------------------------------ */

:root {
  --bg: #ffffff;
  --bg-soft: #f7f6f3;
  --text: #1c1c1c;
  --muted: #5d6066;
  --line: #e4e3df;
  --accent: #1d4f91;
  --accent-soft: #eef3fa;
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --maxw: 780px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.6;
  font-feature-settings: "kern", "liga", "onum";
}

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

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }

/* Header / nav ------------------------------------------------------ */
.site-header {
  border-bottom: 1px solid var(--line);
  font-family: var(--sans);
  font-size: 0.92rem;
}
.site-header .wrap {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 0.5rem 1.5rem; padding-top: 1rem; padding-bottom: 1rem;
}
.brand { font-weight: 600; color: var(--text); letter-spacing: 0.01em; }
.brand:hover { text-decoration: none; color: var(--accent); }
.nav { display: flex; flex-wrap: wrap; gap: 0 1.35rem; margin: 0; padding: 0; list-style: none; }
.nav a { color: var(--muted); padding: 0.25rem 0; border-bottom: 2px solid transparent; }
.nav a:hover { color: var(--text); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--text); border-bottom-color: var(--accent); }

/* Typography -------------------------------------------------------- */
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: 2.1rem; }
h2 { font-size: 1.45rem; margin-top: 3rem; margin-bottom: 1rem; padding-bottom: 0.4rem; border-bottom: 1px solid var(--line); }
h3 { font-size: 1.12rem; }
p { margin: 0 0 1rem; }
.lede { font-size: 1.05rem; }
h1 + .lede { margin-top: 1rem; }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
.sans { font-family: var(--sans); }
.eyebrow {
  font-family: var(--sans); font-size: 0.74rem; font-weight: 600; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--muted); margin: 0 0 0.5rem;
}

main { padding: 2.75rem 0 4rem; }

/* Hero -------------------------------------------------------------- */
.hero { display: grid; grid-template-columns: 168px 1fr; gap: 2rem; align-items: start; }
.hero .portrait {
  width: 180px; height: 180px; object-fit: cover; border-radius: 50%;
  border: 1px solid var(--line); background: var(--bg-soft); display: block;
}
.hero .title { font-family: var(--sans); color: var(--muted); font-size: 0.98rem; margin: 0.5rem 0 1.25rem; line-height: 1.5; }
.hero .contact { font-family: var(--sans); font-size: 0.9rem; margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 0.35rem 1.25rem; }

/* Notice / callout -------------------------------------------------- */
.notice {
  margin: 2rem 0 0; padding: 1rem 1.2rem; background: var(--accent-soft);
  border-left: 3px solid var(--accent); border-radius: 0 6px 6px 0;
}
.notice p { margin: 0; }
.notice p + p { margin-top: 0.5rem; }

/* Papers ------------------------------------------------------------ */
.paper { padding: 1.35rem 0; border-bottom: 1px solid var(--line); }
.paper:last-child { border-bottom: 0; }
.paper h3 { margin-bottom: 0.3rem; }
.paper .authors { margin: 0 0 0.2rem; }
.paper .meta { font-family: var(--sans); font-size: 0.86rem; color: var(--muted); margin: 0 0 0.6rem; }
.paper .meta em { font-style: normal; color: var(--text); }
.links { font-family: var(--sans); font-size: 0.86rem; margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 0.3rem 0.4rem; }
.links li + li::before { content: "·"; color: var(--muted); margin-right: 0.4rem; }
.links a { font-weight: 500; }

details.abstract { margin-top: 0.75rem; }
details.abstract summary {
  cursor: pointer; font-family: var(--sans); font-size: 0.86rem; font-weight: 500; color: var(--accent);
  list-style: none; display: inline-flex; align-items: center; gap: 0.35rem;
}
details.abstract summary::-webkit-details-marker { display: none; }
details.abstract summary::before { content: "+"; display: inline-block; width: 1em; text-align: center; font-weight: 600; }
details.abstract[open] summary::before { content: "−"; }
details.abstract p { margin: 0.6rem 0 0; color: #333; }

.award {
  display: inline-block; font-family: var(--sans); font-size: 0.78rem; font-weight: 500;
  color: #6b4a00; background: #fbf3dc; border-radius: 999px; padding: 0.15rem 0.6rem; margin-bottom: 0.5rem;
}

/* Course page -------------------------------------------------------- */
h3 { margin-bottom: 0.45rem; }
h3.sub { margin-top: 1.75rem; }
.course-meta {
  font-family: var(--sans); font-size: 0.86rem; color: var(--muted); margin: 0 0 1rem;
}
pre.shell {
  overflow-x: auto; background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: 6px; padding: 0.85rem 1rem; font-size: 0.82rem; margin: 0 0 1rem;
}
pre.shell code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
ul.notebooks li { margin-bottom: 0.8rem; }

/* Lists ------------------------------------------------------------- */
ul.clean { list-style: none; padding: 0; margin: 0; }
ul.clean li { margin-bottom: 0.55rem; }
.fields { display: flex; flex-wrap: wrap; gap: 0.45rem; list-style: none; padding: 0; margin: 0; }
.fields li { font-family: var(--sans); font-size: 0.82rem; color: var(--text); background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px; padding: 0.2rem 0.7rem; }

.refs { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 1rem 1.5rem; list-style: none; padding: 0; margin: 0; }
.refs li { font-size: 0.95rem; line-height: 1.45; }
.refs strong { display: block; }
.refs .sans { color: var(--muted); font-size: 0.84rem; }

dl.rows { margin: 0; }
dl.rows div { display: grid; grid-template-columns: 9.5rem 1fr; gap: 0 1rem; padding: 0.6rem 0; border-bottom: 1px solid var(--line); }
dl.rows div:last-child { border-bottom: 0; }
dl.rows dt { font-family: var(--sans); font-size: 0.84rem; color: var(--muted); margin: 0; padding-top: 0.15rem; }
dl.rows dd { margin: 0; }

/* Footer ------------------------------------------------------------ */
.site-footer { border-top: 1px solid var(--line); font-family: var(--sans); font-size: 0.82rem; color: var(--muted); }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem 1.5rem; padding-top: 1.25rem; padding-bottom: 1.5rem; }
.site-footer a { color: var(--muted); }

/* Responsive -------------------------------------------------------- */
@media (max-width: 620px) {
  body { font-size: 16px; }
  h1 { font-size: 1.75rem; }
  .hero { grid-template-columns: 1fr; gap: 1.25rem; }
  .hero .portrait { width: 140px; height: 140px; }
  dl.rows div { grid-template-columns: 1fr; gap: 0.15rem; }
}

/* Print ------------------------------------------------------------- */
@media print {
  .site-header, .site-footer { display: none; }
  body { font-size: 11pt; }
  a { color: inherit; }
  details.abstract { display: block; }
  details.abstract summary { display: none; }
  details.abstract p { display: block; }
}