/* ---------------------------------------------------------------- tokens */

:root {
  --paper:      #ffffff;
  --paper-alt:  #f7f7f5;
  --ink:        #1a1c20;
  --ink-soft:   #4a4f57;
  --ink-faint:  #82888f;
  --rule:       #e2e2de;
  --rule-soft:  #eeeeea;
  --accent:     #2f5ea8;
  --accent-dim: #eaf0f9;
  --tag-bg:     #f0f0ec;

  --serif: "Iowan Old Style", "Charter", "Palatino", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;

  --wrap: 50rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #131417;
    --paper-alt:  #1a1c20;
    --ink:        #e6e6e3;
    --ink-soft:   #a9aeb5;
    --ink-faint:  #7c828a;
    --rule:       #2b2e34;
    --rule-soft:  #232529;
    --accent:     #85aae0;
    --accent-dim: #1c2534;
    --tag-bg:     #22252a;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
a:hover { border-bottom-color: var(--accent); }

p { margin: 0 0 1rem; }

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--paper-alt);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

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

.site-header {
  padding: 4.5rem 0 1.75rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 3rem;
}

.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.9rem;
  font-weight: 500;
}

.site-header h1 {
  font-family: var(--serif);
  font-size: clamp(2.3rem, 6vw, 3.15rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  font-weight: 600;
  margin: 0 0 0.7rem;
}

.tagline {
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 34rem;
  margin: 0 0 1.9rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  font-size: 0.9rem;
}
/* No tagline: the nav would otherwise crowd the title. */
.site-header h1 + .nav { margin-top: 1.75rem; }
.nav a {
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.nav a:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ---------------------------------------------------------------- notices */

.notices { margin: 0 0 3rem; }

.notice {
  background: var(--accent-dim);
  border-left: 2.5px solid var(--accent);
  padding: 0.85rem 1.1rem;
  margin: 0 0 0.75rem;
  font-size: 0.94rem;
  color: var(--ink-soft);
  border-radius: 0 3px 3px 0;
}
.notice:last-child { margin-bottom: 0; }

/* ---------------------------------------------------------------- sections */

main section { margin-bottom: 4.25rem; }

.registration {
  margin: 0 0 2rem;
  color: var(--ink);
}

/* Section headers are the only grey prose on the page; everything a visitor
   actually reads is --ink. Metadata (dates, bylines, footer) stays muted. */
h2.rule {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding-bottom: 0.8rem;
  margin: 0 0 1.9rem;
  border-bottom: 1px solid var(--rule);
}

h3.sub {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin: 2.5rem 0 0.9rem;
  letter-spacing: -0.01em;
}

.section-note {
  color: var(--ink);
  margin-bottom: 1.75rem;
  max-width: 38rem;
}

.lead-in {
  margin-top: 1.75rem;
  margin-bottom: 0.6rem;
  color: var(--ink);
}

.questions {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--rule-soft);
}
.questions li {
  padding: 0.7rem 0 0.7rem 1.4rem;
  border-bottom: 1px solid var(--rule-soft);
  position: relative;
  color: var(--ink);
}
.questions li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--ink-faint);
}
/* Prose that follows the question list needs its own breathing room —
   the list itself carries no bottom margin. */
.questions + p { margin-top: 1.85rem; }

/* ---------------------------------------------------------------- facts */

/* No border-top: the section header's rule already closes the top edge,
   and two lines that close together read as a mistake. */
.facts { margin: 0; }
.fact {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.fact dt {
  color: var(--ink-faint);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  padding-top: 0.15rem;
}
.fact dd { margin: 0; }

/* ---------------------------------------------------------------- grading */

.grading { border-top: 1px solid var(--rule-soft); }

.grade-row {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1.25rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.grade-pct {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1.3;
}
.grade-body h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
  font-weight: 600;
}
.grade-body p {
  margin: 0;
  color: var(--ink);
}

/* ---------------------------------------------------------------- speakers */

.tbd { color: var(--ink); }

.speakers { list-style: none; padding: 0; margin: 1rem 0 0; }
.speakers li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--rule-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: baseline;
}
.speakers .aff { color: var(--ink-soft); font-size: 0.93rem; }
.speakers .when { color: var(--ink-faint); font-size: 0.85rem; margin-left: auto; }

/* ---------------------------------------------------------------- schedule */

.unit { margin-bottom: 3.25rem; }

.unit-head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: 0.5rem;
}
.unit-num {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--ink-soft);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  white-space: nowrap;
}
.unit-title {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 0;
}
.unit-blurb {
  color: var(--ink);
  max-width: 40rem;
  margin-bottom: 1.5rem;
}

.sessions { border-top: 1px solid var(--rule); }

.session {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--rule-soft);
  scroll-margin-top: 1.5rem;
}
.session:target {
  background: var(--accent-dim);
  box-shadow: -1rem 0 0 var(--accent-dim), 1rem 0 0 var(--accent-dim);
}

.s-date {
  display: flex;
  flex-direction: column;
  padding-top: 0.15rem;
  line-height: 1.35;
}
.s-date time {
  font-weight: 600;
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
}
.s-date .dow {
  font-size: 0.78rem;
  color: var(--ink-faint);
}
.s-date .wk {
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.s-date .wknum {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--ink-faint);
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
}

/* ---------------------------------------------------------------- instructor */

.instructor { max-width: 38rem; }
.who {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 600;
  margin: 0 0 0.3rem;
  letter-spacing: -0.01em;
}
.who-links {
  font-size: 0.92rem;
  color: var(--ink-faint);
  margin-bottom: 1rem;
}
.instructor p:last-child { margin-bottom: 0; }

.s-title {
  font-size: 1.08rem;
  font-weight: 600;
  margin: 0;
  line-height: 1.4;
  letter-spacing: -0.005em;
}

.anchor {
  color: var(--ink-faint);
  border: none;
  opacity: 0;
  margin-left: 0.4rem;
  font-weight: 400;
  transition: opacity 0.12s;
}
.session:hover .anchor { opacity: 1; }
.anchor:hover { color: var(--accent); border: none; }

.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.5rem 0 0; }
.tag {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
  background: var(--tag-bg);
  color: var(--ink-faint);
}
.tag-guest   { background: var(--accent-dim); color: var(--accent); }
.tag-seminar { background: var(--accent-dim); color: var(--accent); }
.tag-project { background: var(--accent-dim); color: var(--accent); }

.s-summary {
  margin: 0.65rem 0 0;
  color: var(--ink);
}

.s-readings { margin-top: 0.9rem; }
.s-readings h4 {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.4rem;
}

.reflist { list-style: none; padding: 0; margin: 0; }
.reflist li {
  font-size: 0.92rem;
  padding: 0.2rem 0 0.2rem 0.95rem;
  position: relative;
  line-height: 1.5;
}
.reflist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--rule);
}
.byline { color: var(--ink-faint); }
.venue { color: var(--ink-faint); font-size: 0.9em; }

.s-note {
  margin: 0.8rem 0 0;
  font-size: 0.88rem;
  color: var(--ink-faint);
  font-style: italic;
}

.s-links { margin: 0.7rem 0 0; font-size: 0.9rem; }

.session-off { opacity: 0.55; }
.session-off .s-title { font-weight: 500; }

/* ---------------------------------------------------------------- bibliography */

.bibliography {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--rule-soft);
}
.bibliography li {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--rule-soft);
  line-height: 1.5;
}
.bibliography li::before { display: none; }

.refdate {
  color: var(--ink-faint);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  padding-top: 0.1em;
}
.reftitle { border-bottom-color: transparent; }
.reftitle:hover { border-bottom-color: var(--accent); }

/* ---------------------------------------------------------------- project */

#project ul { padding-left: 1.15rem; }
#project li { margin-bottom: 0.55rem; color: var(--ink); }
#project li strong { color: var(--ink); }

/* ---------------------------------------------------------------- footer */

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 2rem 0 3.5rem;
  color: var(--ink-faint);
  font-size: 0.87rem;
}
.site-footer p { margin: 0 0 0.3rem; }

/* ---------------------------------------------------------------- mobile */

@media (max-width: 34rem) {
  body { font-size: 16px; }
  .site-header { padding-top: 2.75rem; }
  .bibliography li { grid-template-columns: 1fr; gap: 0.15rem; padding: 0.7rem 0; }
  .session { grid-template-columns: 1fr; gap: 0.5rem; }
  .s-date { flex-direction: row; gap: 0.5rem; align-items: baseline; }
  .fact { grid-template-columns: 1fr; gap: 0.1rem; padding: 0.7rem 0; }
  .grade-row { grid-template-columns: 3.5rem 1fr; gap: 0.9rem; }
  .anchor { opacity: 1; }
  .unit-head { flex-wrap: wrap; gap: 0.5rem; }
}

@media print {
  .nav, .anchor { display: none; }
  body { font-size: 10.5pt; }
  .session { break-inside: avoid; }
}