/* Layout and typography in the style of the al-folio Jekyll theme. */

:root {
  --text: #1a1a1a;
  --text-light: #6b6f76;
  --bg: #ffffff;
  --divider: rgba(0, 0, 0, 0.1);
  --theme: #0a6aa1;
  --theme-hover: #08527c;
  --accent: #14325c;
  --accent-2: #1d6f8c;
  --muted-bg: #f3f5f8;
  --nav-height: 3.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e8e8e8;
    --text-light: #9aa0a6;
    --bg: #1c1c1d;
    --divider: #3a3a3e;
    --theme: #4fb3e0;
    --theme-hover: #86cdee;
    --muted-bg: #26272a;
  }
  .button-primary,
  .button-primary:hover { color: #0d1b2a; }
}

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

html { scroll-padding-top: calc(var(--nav-height) + 1rem); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Roboto", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.6;
  padding-top: var(--nav-height);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--theme); text-decoration: none; }
a:hover, a:focus { color: var(--theme-hover); text-decoration: underline; }

h1, h2, h3 { font-weight: 400; line-height: 1.25; }

.container {
  width: 100%;
  max-width: 930px;
  margin: 0 auto;
  padding: 0 1rem;
}

main.container { flex: 1; padding-top: 2.5rem; padding-bottom: 3rem; }

/* ---------- Navigation ---------- */

.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--divider);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.06);
}

/* Accent stripe on the left of the navbar */
.site-nav::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: min(56vw, 34rem);
  background: linear-gradient(to right, rgba(20, 50, 92, 0.12), rgba(20, 50, 92, 0));
  pointer-events: none;
}

.nav-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--nav-height);
}

.nav-brand {
  color: var(--text);
  font-size: 1.05rem;
  white-space: nowrap;
}
.nav-brand:hover { color: var(--text); text-decoration: none; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links > a,
.nav-dropdown > summary {
  color: var(--text);
  padding: 0.5rem 0.7rem;
  font-size: 0.95rem;
  border-radius: 4px;
  cursor: pointer;
}
.nav-links > a:hover,
.nav-dropdown > summary:hover { color: var(--theme); text-decoration: none; }
.nav-links > a.active,
.nav-dropdown > summary.active { color: var(--theme); font-weight: 500; }

.nav-dropdown { position: relative; }
.nav-dropdown > summary { list-style: none; }
.nav-dropdown > summary::-webkit-details-marker { display: none; }
.nav-dropdown > summary::after {
  content: "";
  display: inline-block;
  margin-left: 0.35rem;
  vertical-align: 0.2em;
  border-top: 0.3em solid currentColor;
  border-left: 0.3em solid transparent;
  border-right: 0.3em solid transparent;
}

.nav-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 0.3rem);
  min-width: 8rem;
  background: var(--bg);
  border: 1px solid var(--divider);
  border-radius: 4px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
  padding: 0.3rem 0;
}
.nav-menu a {
  display: block;
  padding: 0.35rem 1rem;
  color: var(--text);
}
.nav-menu a:hover { background: var(--muted-bg); text-decoration: none; }
.nav-menu a.active { color: var(--theme); font-weight: 500; }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 0.5rem;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 4px 0;
  background: var(--text);
}

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    flex-direction: column;
    align-items: flex-end;
    background: var(--bg);
    border-bottom: 1px solid var(--divider);
    padding: 0.5rem 1rem 1rem;
  }
  .nav-links.open { display: flex; }
  .nav-menu { position: static; box-shadow: none; border: 0; text-align: right; }
}

/* ---------- Page header ---------- */

.post-header { margin-bottom: 1.5rem; }

.post-title {
  font-size: 2.6rem;
  margin: 0 0 0.25rem;
}

.post-header .desc {
  color: var(--text-light);
  font-size: 1.1rem;
  font-weight: 300;
  margin: 0;
}

/* ---------- Hero banner ---------- */

.home-banner {
  position: relative;
  margin: 0 0 1.75rem;
  aspect-ratio: 16 / 6;
  border-radius: 6px;
  overflow: hidden;
  background:
    radial-gradient(circle at 18% 30%, rgba(79, 179, 224, 0.35), transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(29, 111, 140, 0.55), transparent 50%),
    linear-gradient(120deg, var(--accent) 0%, #1b4a7a 55%, var(--accent-2) 100%);
  color: #fff;
}

.home-banner svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.35;
}

.home-banner-text {
  position: absolute;
  left: 2rem;
  bottom: 1.6rem;
  right: 2rem;
}

.home-banner-text .banner-edition {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.85;
  margin: 0 0 0.3rem;
}

.home-banner-text .banner-title {
  font-family: "Roboto Slab", Georgia, serif;
  font-size: clamp(1.4rem, 4vw, 2.4rem);
  font-weight: 300;
  line-height: 1.2;
  margin: 0;
}
.home-banner-text .banner-title b { font-weight: 700; }

.home-banner-caption {
  color: var(--text-light);
  font-size: 0.82rem;
  margin: -1.3rem 0 1.75rem;
  text-align: right;
}

@media (max-width: 575.98px) {
  .home-banner { aspect-ratio: 4 / 3; }
  .home-banner-text { left: 1.1rem; right: 1.1rem; bottom: 1.1rem; }
}

/* ---------- Sections ---------- */

.home-intro {
  border-bottom: 1px solid var(--divider);
  padding-bottom: 2rem;
}

.home-kicker {
  color: var(--text-light);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 0.65rem;
}

.home-lead,
.lead {
  font-size: 1.15rem;
  line-height: 1.65;
  margin: 0 0 1.35rem;
  max-width: 52rem;
}

.section {
  border-bottom: 1px solid var(--divider);
  padding: 1.75rem 0;
}
.section:last-child { border-bottom: 0; }
.page-sections > .section:first-child { padding-top: 0; }

.section h2 {
  font-size: 1.55rem;
  margin: 0 0 1rem;
}
.section h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 1.2rem 0 0.5rem;
}
.section p { margin: 0 0 0.9rem; }
.section p:last-child { margin-bottom: 0; }

/* ---------- Fact lists ---------- */

.facts {
  display: grid;
  margin: 0 0 1.35rem;
  max-width: 48rem;
}
.facts:last-child { margin-bottom: 0; }
.facts div {
  display: grid;
  grid-template-columns: minmax(11rem, 15rem) 1fr;
  gap: 1rem;
  border-bottom: 1px solid var(--divider);
  padding: 0.55rem 0;
}
.facts div:first-child { border-top: 1px solid var(--divider); }
.facts dt { color: var(--text-light); font-weight: 600; }
.facts dd { margin: 0; }

.tba { color: var(--text-light); font-style: italic; }

/* ---------- Buttons ---------- */

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
}

.button {
  border: 1px solid var(--theme);
  border-radius: 4px;
  display: inline-block;
  font-weight: 600;
  line-height: 1.2;
  padding: 0.6rem 0.85rem;
  background: transparent;
  color: var(--theme);
  font-family: inherit;
  font-size: inherit;
}
.button:hover { text-decoration: none; background: var(--muted-bg); }
.button-primary { background: var(--theme); color: #fff; }
.button-primary:hover { background: var(--theme-hover); border-color: var(--theme-hover); color: #fff; }
.button:disabled {
  background: #e9ecef;
  border-color: #ced4da;
  color: #626970;
  cursor: not-allowed;
}
.action-note { color: var(--text-light); font-size: 0.9rem; }

/* ---------- Lists ---------- */

.topic-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 2rem;
}
.topic-columns h3 { margin-top: 0.4rem; }

.plain-list { margin: 0.4rem 0 0; padding-left: 1.2rem; }
.plain-list li + li { margin-top: 0.35rem; }

/* ---------- People ---------- */

.people {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.person {
  border: 1px solid var(--divider);
  border-radius: 6px;
  padding: 0.9rem 1rem;
}
.person-name { font-weight: 600; margin: 0; }
.person-role { font-size: 0.92rem; margin: 0.2rem 0 0; }
.person-affiliation { color: var(--text-light); font-size: 0.9rem; margin: 0.15rem 0 0; }

/* ---------- Announcements ---------- */

.news { width: 100%; border-collapse: collapse; }
.news th {
  width: 20%;
  text-align: left;
  font-weight: 600;
  vertical-align: top;
  padding: 0.3rem 1rem 0.3rem 0;
  white-space: nowrap;
}
.news td { padding: 0.3rem 0; }

/* ---------- Program ---------- */

.program-day {
  border-top: 1px solid var(--divider);
}
.program-slot {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--divider);
}
.program-time {
  color: var(--text-light);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}
.program-title { font-weight: 600; margin: 0; }
.program-detail { color: var(--text-light); font-size: 0.92rem; margin: 0.15rem 0 0; }
.program-break .program-title { font-weight: 400; color: var(--text-light); }

/* ---------- Archived edition (markdown tables) ---------- */

.archive-note {
  background: var(--muted-bg);
  border-radius: 6px;
  padding: 0.8rem 1rem;
  margin-bottom: 1.5rem;
}

.archive table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.5rem;
  font-size: 0.95rem;
}
.archive th, .archive td {
  border-bottom: 1px solid var(--divider);
  padding: 0.55rem 0.5rem;
  text-align: left;
  vertical-align: middle;
}
.archive th { color: var(--text-light); font-weight: 600; }
.archive td img {
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: 50%;
  margin: 2px;
}
.archive h2 { margin-top: 2rem; }
.archive h3 { margin-top: 1.5rem; font-weight: 700; font-size: 1.1rem; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--divider);
  color: var(--text-light);
  font-size: 0.88rem;
  padding: 1.25rem 0;
  text-align: center;
}
.site-footer p { margin: 0.2rem 0; }
.footer-affiliations,
.footer-credits { font-size: 0.8rem; }

/* ---------- Small screens ---------- */

@media (max-width: 575.98px) {
  .post-title { font-size: 2rem; }
  .facts div,
  .program-slot { grid-template-columns: 1fr; gap: 0.2rem; }
  .topic-columns,
  .people { grid-template-columns: 1fr; }
  .archive table { display: block; overflow-x: auto; }
}