/* ---------------------------------------------------------------------------
   Tokens
   --------------------------------------------------------------------------- */
:root {
  --paper:       #f4f5f0;
  --panel:       #fdfdfb;
  --ink:         #14181a;
  --muted:       #5f6a68;
  --rule:        #d6dad0;
  --accent:      #2c5d4f;
  --accent-soft: #e7ece5;

  --serif: "Iowan Old Style", Charter, "Bitstream Charter", Palatino, "Palatino Linotype", Georgia, serif;
  --sans:  ui-sans-serif, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --measure: 34rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:       #14181a;
    --panel:       #1b2022;
    --ink:         #e6e9e3;
    --muted:       #95a09c;
    --rule:        #2b3234;
    --accent:      #86c3ac;
    --accent-soft: #1d2926;
  }
}

/* ---------------------------------------------------------------------------
   Base
   --------------------------------------------------------------------------- */
* { box-sizing: border-box; }

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

body {
  margin: 0;
  padding: 0 1.5rem 5rem;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
}

a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1.5rem;
  top: 1rem;
  background: var(--panel);
  padding: 0.5rem 0.75rem;
  z-index: 10;
}

/* ---------------------------------------------------------------------------
   Masthead
   --------------------------------------------------------------------------- */
.masthead,
main,
.colophon {
  max-width: 58rem;
  margin: 0 auto;
}

.masthead {
  padding: 3rem 0 1.25rem;
  border-bottom: 1px solid var(--rule);
}

.masthead__title {
  margin: 0;
  font-size: clamp(1.75rem, 1.2rem + 2vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.masthead__title a { text-decoration: none; }

.masthead__meta {
  margin: 0.4rem 0 0;
  font-family: var(--sans);
  font-size: 0.875rem;
  color: var(--muted);
}

.masthead__nav {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-family: var(--sans);
  font-size: 0.9375rem;
}
.masthead__nav a {
  text-decoration: none;
  padding-bottom: 0.15rem;
  border-bottom: 2px solid transparent;
  color: var(--muted);
}
.masthead__nav a:hover { color: var(--ink); }
.masthead__nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* ---------------------------------------------------------------------------
   Pages
   --------------------------------------------------------------------------- */
.page { padding-top: 2.5rem; }

.page__title {
  margin: 0 0 2rem;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.005em;
}

.page__subtitle {
  margin: 3rem 0 1rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--muted);
}

.year {
  margin: 3rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--muted);
}

.prose { max-width: var(--measure); }
.prose h2 {
  margin: 2.5rem 0 0.5rem;
  font-size: 1.1875rem;
  font-weight: 600;
}
.prose ul { padding-left: 1.1rem; }
.prose li { margin-bottom: 0.35rem; }

.empty {
  max-width: var(--measure);
  padding: 1.75rem 0 0;
  border-top: 1px solid var(--rule);
  color: var(--muted);
}
.empty p { margin: 0 0 0.75rem; }

.more {
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.9375rem;
}

/* ---------------------------------------------------------------------------
   Talks
   --------------------------------------------------------------------------- */
.talks { display: flex; flex-direction: column; }

.talk {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  gap: 2rem;
  padding: 1.75rem 0;
  border-top: 1px solid var(--rule);
}
.talk:first-child { border-top: 0; padding-top: 0; }

.talk__when {
  font-family: var(--sans);
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.4;
}
.talk__when time { display: block; }
.talk__weekday { display: block; }
.talk__day {
  display: block;
  font-size: 1.75rem;
  line-height: 1.1;
  color: var(--ink);
  font-variant-numeric: lining-nums;
}
.talk__month { display: block; }
.talk__hour,
.talk__room { margin: 0.5rem 0 0; }

.talk__body { min-width: 0; }

.talk__flag {
  margin: 0 0 0.6rem;
  font-family: var(--sans);
  font-size: 0.8125rem;
  color: var(--accent);
}

.talk__speaker {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.9375rem;
  font-weight: 600;
}
.talk__affiliation {
  font-weight: 400;
  color: var(--muted);
}
.talk__affiliation::before { content: ", "; }

.talk__title {
  margin: 0.3rem 0 0;
  font-size: 1.3125rem;
  font-weight: 400;
  line-height: 1.3;
  max-width: 30rem;
}

.talk__abstract {
  margin-top: 0.9rem;
  max-width: var(--measure);
  color: var(--ink);
}
/* A folded (">") YAML abstract keeps one newline per paragraph break, which
   newline_to_br turns into a single <br>. Give those breaks real air. */
.talk__abstract br { display: block; content: ""; margin-top: 0.7rem; }

.talk__note {
  margin-top: 0.9rem;
  max-width: var(--measure);
  color: var(--muted);
  font-style: italic;
}

.talk__links {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-family: var(--sans);
  font-size: 0.875rem;
}

/* The one place the page raises its voice: whatever is happening next. */
.talk--next {
  background: var(--accent-soft);
  border-top: 0;
  border-left: 3px solid var(--accent);
  padding: 1.75rem 1.75rem 1.75rem 1.5rem;
  margin-bottom: 0.5rem;
}
.talk--next + .talk { border-top: 0; }
.talk--next .talk__title { font-size: 1.5rem; }

.talk--cancelled .talk__title,
.talk--cancelled .talk__speaker { text-decoration: line-through; }
.talk--cancelled { opacity: 0.65; }

.talk--past { opacity: 0.5; }

/* ---------------------------------------------------------------------------
   Colophon
   --------------------------------------------------------------------------- */
.colophon {
  margin-top: 4rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.8125rem;
  color: var(--muted);
}
.colophon p { margin: 0 0 0.3rem; }

/* ---------------------------------------------------------------------------
   MathJax
   --------------------------------------------------------------------------- */
mjx-container[display="true"] {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.35rem 0;
}
mjx-container { color: inherit; }

/* ---------------------------------------------------------------------------
   Narrow screens
   --------------------------------------------------------------------------- */
@media (max-width: 40rem) {
  body { padding: 0 1.1rem 3.5rem; }

  .talk {
    grid-template-columns: 1fr;
    gap: 0.6rem;
  }
  .talk__when {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: baseline;
  }
  .talk__when time {
    display: flex;
    gap: 0.35rem;
    align-items: baseline;
  }
  .talk__day { font-size: 1rem; }
  .talk__hour,
  .talk__room { margin: 0; }
  .talk__hour::before,
  .talk__room::before { content: "· "; }

  .talk--next { padding: 1.5rem 1.1rem; }
  .talk--next .talk__title { font-size: 1.3125rem; }
}