/* ==========================================================================
   FYS 191MCS26 — site styles
   Light palette on :root, dark palette swapped under prefers-color-scheme.
   ========================================================================== */

:root {
  --bg:            #f7f6f3;
  --surface:       #ffffff;
  --surface-2:     #f1efea;
  --border:        #e0ddd6;
  --border-strong: #c9c5bb;

  --text:          #1c1b19;
  --text-muted:    #63605a;
  --text-faint:    #8b877f;

  --accent:        #2f5d8c;
  --accent-soft:   #e8f0f8;

  --mon:           #8c4a2f;
  --mon-soft:      #f7ece6;
  --wed:           #2f6b5d;
  --wed-soft:      #e6f2ef;

  --off:           #a03b3b;
  --off-soft:      #fbeded;

  --shadow:        0 1px 2px rgba(28, 27, 25, .06), 0 8px 24px rgba(28, 27, 25, .06);
  --shadow-lift:   0 2px 4px rgba(28, 27, 25, .08), 0 16px 40px rgba(28, 27, 25, .12);

  --radius:        14px;
  --radius-sm:     8px;

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

@media (prefers-color-scheme: dark) {
  :root {
    --bg:            #16161a;
    --surface:       #1e1e23;
    --surface-2:     #26262c;
    --border:        #33333b;
    --border-strong: #4a4a55;

    --text:          #ecebe8;
    --text-muted:    #a5a29c;
    --text-faint:    #7d7a74;

    --accent:        #7fb0dd;
    --accent-soft:   #1c2b39;

    --mon:           #e0a184;
    --mon-soft:      #33241d;
    --wed:           #7fc9b6;
    --wed-soft:      #1b2f2a;

    --off:           #e08c8c;
    --off-soft:      #331e1e;

    --shadow:        0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
    --shadow-lift:   0 2px 4px rgba(0,0,0,.5), 0 16px 40px rgba(0,0,0,.5);
  }
}

* { 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: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.masthead {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.masthead-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 18px 0;
}

.masthead .course-no {
  font-family: var(--mono);
  font-size: .8rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
}

.masthead .course-no strong { color: var(--text); font-weight: 600; }

.masthead nav {
  display: flex;
  gap: 20px;
  font-size: .88rem;
}

.masthead nav a {
  color: var(--text-muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}

.masthead nav a:hover { color: var(--text); }
.masthead nav a[aria-current="page"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

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

.hero { padding: 68px 0 44px; }

.eyebrow {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 14px;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.1rem, 6vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -.01em;
  font-weight: 600;
  margin: 0 0 18px;
  max-width: 18ch;
}

.hero .blurb {
  font-size: 1.12rem;
  color: var(--text-muted);
  max-width: 58ch;
  margin: 0 0 8px;
}

.hero .meta {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  font-size: .92rem;
  color: var(--text-muted);
}

.hero .meta span strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- Day chooser (home) ---------- */

.chooser-label {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 16px;
}

.chooser {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  padding-bottom: 12px;
}

.day-card {
  display: block;
  position: relative;
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 28px 26px;
  box-shadow: var(--shadow);
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
  overflow: hidden;
}

.day-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--card-accent);
}

.day-card:hover,
.day-card:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  border-color: var(--border-strong);
}

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

.day-card.mon { --card-accent: var(--mon); --card-soft: var(--mon-soft); }
.day-card.wed { --card-accent: var(--wed); --card-soft: var(--wed-soft); }

.day-card .day-name {
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.1;
  margin: 0 0 4px;
  color: var(--card-accent);
}

.day-card .day-sub {
  font-size: .88rem;
  color: var(--text-muted);
  margin: 0 0 20px;
}

.day-card ul {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.day-card li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  background: var(--card-soft);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  font-size: .92rem;
}

.day-card li .sect { color: var(--text-muted); }
.day-card li .time { font-family: var(--mono); font-size: .86rem; color: var(--text); }

.day-card .go {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: .92rem;
  font-weight: 600;
  color: var(--card-accent);
}

.day-card .go .arrow { transition: transform .16s ease; }
.day-card:hover .go .arrow { transform: translateX(4px); }

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

section.block { padding: 46px 0; }
section.block + section.block { border-top: 1px solid var(--border); }

h2.section-title {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 6px;
}

.section-note {
  color: var(--text-muted);
  font-size: .95rem;
  margin: 0 0 24px;
  max-width: 62ch;
}

/* ---------- Key dates ---------- */

.keydates {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.keydates li {
  background: var(--surface);
  padding: 16px 18px;
}

.keydates .kd-date {
  font-family: var(--mono);
  font-size: .8rem;
  color: var(--accent);
  display: block;
  margin-bottom: 3px;
}

.keydates .kd-label { font-size: .93rem; color: var(--text); }

/* ---------- Schedule page header ---------- */

.day-header { padding: 52px 0 34px; }

.day-header h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 2.9rem);
  font-weight: 600;
  margin: 0 0 10px;
  line-height: 1.12;
}

.day-header h1 .dow { color: var(--day-accent); }


.section-chips { display: flex; flex-wrap: wrap; gap: 10px; }

.chip {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  background: var(--day-soft);
  color: var(--text);
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 7px 15px;
  font-size: .9rem;
}

.chip .chip-label { color: var(--text-muted); font-size: .84rem; }
.chip .chip-time { font-family: var(--mono); font-size: .86rem; font-weight: 600; }

.day-page.mon { --day-accent: var(--mon); --day-soft: var(--mon-soft); }
.day-page.wed { --day-accent: var(--wed); --day-soft: var(--wed-soft); }

.backlink {
  display: inline-block;
  font-size: .88rem;
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: 20px;
}
.backlink:hover { color: var(--text); }

/* ---------- Schedule ---------- */

.schedule { display: grid; gap: 14px; padding-bottom: 60px; }

.unit-head {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 22px 0 2px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.unit-head::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}
.schedule > .unit-head:first-child { margin-top: 0; }

.meeting {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.meeting > .m-head {
  display: grid;
  grid-template-columns: 108px 34px 1fr;
  align-items: baseline;
  gap: 16px;
  padding: 18px 20px;
}

.m-date {
  font-family: var(--mono);
  font-size: .84rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.m-num {
  font-family: var(--mono);
  font-size: .78rem;
  font-weight: 600;
  color: var(--day-accent);
  background: var(--day-soft);
  border-radius: 6px;
  padding: 3px 0;
  text-align: center;
}

.m-title { font-weight: 600; font-size: 1.02rem; line-height: 1.35; }

.m-body {
  padding: 4px 20px 22px;
  border-top: 1px solid var(--border);
  margin-top: -1px;
}

.m-body .m-summary {
  color: var(--text-muted);
  margin: 16px 0 18px;
  max-width: 68ch;
}

.m-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.m-field {
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
}

.m-field .fl {
  display: block;
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 5px;
}

.m-field .fv { font-size: .93rem; }

/* Slides: view in browser (primary) + download the .pptx (secondary) */
.m-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin: 0;
}

.m-slides-alt {
  font-size: .84rem;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 1px;
}

.m-slides-alt:hover { color: var(--text); border-bottom-color: var(--text); }

/* Production-only marker on decks students can't see yet */
.m-unpub {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--off);
  background: var(--off-soft);
  border-radius: 999px;
  padding: 4px 10px;
}

/* Production-only build badge in the masthead */
.build-badge {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--surface);
  background: var(--off);
  border-radius: 999px;
  padding: 3px 10px;
  margin-left: auto;
}

.m-slides {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  font-size: .9rem;
  font-weight: 600;
  color: var(--day-accent);
  background: var(--day-soft);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 9px 16px;
  transition: border-color .15s ease, transform .15s ease;
}

.m-slides:hover {
  border-color: var(--day-accent);
  transform: translateY(-1px);
}

.m-slides:focus-visible { outline: 2px solid var(--day-accent); outline-offset: 2px; }
.m-slides-icon { font-size: 1rem; line-height: 1; }

/* Guest lectures and the wrap-up sit quieter than taught classes */
.meeting.guest { background: var(--surface-2); box-shadow: none; }
.meeting.guest .m-num { color: var(--text-faint); background: transparent; }
.m-title.is-tbd { color: var(--text-muted); font-weight: 500; }
.meeting.guest .m-summary { margin-bottom: 0; }

/* Callout note on a meeting */
.m-note {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  font-size: .9rem;
  margin: 0 20px 18px;
}
.m-note .m-note-icon { flex: none; }

/* Standing notice above a day's schedule. Same visual family as .m-note, but
   full width and outside any meeting row. */
.schedule-notice {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  font-size: .9rem;
  margin: 0 0 20px;
}
.schedule-notice strong { font-weight: 700; }

/* Days off */
.meeting.off {
  background: var(--off-soft);
  border-color: color-mix(in srgb, var(--off) 30%, transparent);
  box-shadow: none;
}

.meeting.off > .m-head { grid-template-columns: 108px 1fr; }
.meeting.off .m-title { color: var(--off); font-weight: 600; font-size: .97rem; }
.meeting.off .m-note {
  background: color-mix(in srgb, var(--off) 10%, transparent);
  border-left-color: var(--off);
  margin-top: -6px;
}

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

.foot {
  border-top: 1px solid var(--border);
  padding: 28px 0 44px;
  font-size: .86rem;
  color: var(--text-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
}

.foot a { color: var(--text-muted); }

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
  .wrap { padding: 0 18px; }
  .hero { padding: 46px 0 32px; }

  .meeting > .m-head {
    grid-template-columns: 40px 1fr;
    grid-template-areas:
      "num  date"
      "num  title";
    gap: 4px 14px;
    row-gap: 2px;
  }
  .meeting > .m-head .m-num   { grid-area: num; align-self: start; padding: 4px 0; }
  .meeting > .m-head .m-date  { grid-area: date; }
  .meeting > .m-head .m-title { grid-area: title; }

  .meeting.off > .m-head {
    grid-template-columns: 1fr;
    grid-template-areas: "date" "title";
  }
}

/* Printing: every row is always visible, so the full schedule prints out as a
   plain handout with nothing to expand first. */
@media print {
  body { background: #fff; }
  .masthead nav, .backlink, .foot { display: none; }
  .meeting { break-inside: avoid; box-shadow: none; border-color: #ccc; }
}