/* ============================================================
   CSCI 680 · Affective Computing · Fall 2026
   Palette derives from the magma colormap — the same ramp that
   colors nearly every spectrogram figure in the assigned papers.
   Each unit of the course takes one stop along it.
   ============================================================ */

:root {
  /* surfaces */
  --ink:        #0D0C12;
  --ink-2:      #131220;
  --panel:      #17162099;
  --panel-solid:#191825;
  --line:       #29273a;
  --line-soft:  #201f2e;

  /* text */
  --text:       #E9E4F2;
  --text-2:     #C4BDD6;
  --muted:      #948CA8;
  --link:       #BEA9FF;

  /* unit ramp (magma-ish, six stops for six units) */
  --u1: #6C5CE0;
  --u2: #A64BC4;
  --u3: #D9457F;
  --u4: #EE6A4D;
  --u5: #F2A03C;
  --u6: #F3D46A;

  --ramp: linear-gradient(90deg,
      var(--u1) 0%, var(--u2) 20%, var(--u3) 40%,
      var(--u4) 60%, var(--u5) 80%, var(--u6) 100%);

  /* type */
  --display: "Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --body:    "Newsreader", Georgia, "Times New Roman", serif;
  --mono:    "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --wrap: 1080px;
  --r: 10px;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 92px; }

body {
  margin: 0;
  background: var(--ink);
  background-image:
    radial-gradient(900px 520px at 12% -8%, #1c1734 0%, transparent 60%),
    radial-gradient(760px 460px at 92% 4%, #201430 0%, transparent 62%);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.72;
  font-optical-sizing: auto;
}

/* the colorbar, top of every page */
body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--ramp);
  z-index: 60;
}

img { max-width: 100%; }

a { color: var(--link); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: #D8CBFF; }

:focus-visible {
  outline: 2px solid var(--u5);
  outline-offset: 3px;
  border-radius: 3px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip {
  position: absolute; left: -999px; top: 8px; z-index: 100;
  background: var(--panel-solid); border: 1px solid var(--line);
  padding: 10px 16px; border-radius: var(--r); font-family: var(--mono); font-size: 13px;
}
.skip:focus { left: 16px; }

/* ── nav ──────────────────────────────────────────────────── */

.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13, 12, 18, .82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.nav-inner {
  max-width: var(--wrap); margin: 0 auto;
  padding: 14px 24px;
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 26px;
}
.nav-mark {
  font-family: var(--display);
  font-weight: 700; font-size: 15px; letter-spacing: -.01em;
  color: var(--text); text-decoration: none; margin-right: auto;
}
.nav-mark span { color: var(--muted); font-weight: 400; }
.nav-link {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: .06em;
  text-transform: uppercase; color: var(--muted); text-decoration: none;
  padding-bottom: 2px; border-bottom: 1px solid transparent;
}
.nav-link:hover { color: var(--text); }
.nav-link[aria-current="page"] { color: var(--text); border-bottom-color: var(--u4); }

/* ── layout ───────────────────────────────────────────────── */

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.band { padding: 66px 0; border-top: 1px solid var(--line-soft); }
.band:first-of-type { border-top: 0; }
.band-tight { padding: 44px 0; }

.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--muted); margin: 0 0 18px;
}

h1, h2, h3, h4 { font-family: var(--display); font-weight: 700; letter-spacing: -.025em; line-height: 1.05; }

h1 {
  font-size: clamp(2.9rem, 8vw, 5.4rem);
  margin: 0 0 18px;
  text-wrap: balance;
}
h2 { font-size: clamp(1.6rem, 3.6vw, 2.3rem); margin: 0 0 22px; }
h3 { font-size: 1.18rem; margin: 0 0 10px; letter-spacing: -.015em; }
h4 { font-size: .98rem; margin: 0 0 8px; }

p { margin: 0 0 18px; }
p:last-child { margin-bottom: 0; }

.lede {
  font-size: clamp(1.12rem, 2.2vw, 1.4rem);
  line-height: 1.55; color: var(--text-2);
  max-width: 40ch; margin: 0 0 40px;
}
.prose { max-width: 68ch; color: var(--text-2); }
.prose strong { color: var(--text); font-weight: 600; }

.note {
  font-family: var(--mono); font-size: 13px; line-height: 1.65;
  color: var(--muted);
}

/* ── hero ─────────────────────────────────────────────────── */

.hero { padding: 76px 0 54px; }
.hero-eyebrow {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: .18em;
  text-transform: uppercase; color: var(--muted);
  display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 26px;
}
.hero-eyebrow b { color: var(--u5); font-weight: 500; }

.facts {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px; background: var(--line-soft);
  border: 1px solid var(--line-soft); border-radius: var(--r); overflow: hidden;
}
.fact { background: var(--ink-2); padding: 18px 20px; }
.fact dt {
  font-family: var(--mono); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 7px;
}
.fact dd { margin: 0; font-size: 15px; line-height: 1.45; color: var(--text); }

/* ── the semester signal ──────────────────────────────────── */

.signal { margin: 54px 0 0; }
.signal-head {
  display: flex; flex-wrap: wrap; justify-content: space-between;
  align-items: baseline; gap: 12px; margin-bottom: 14px;
}
.signal-head h2 { font-size: 1.05rem; margin: 0; letter-spacing: -.01em; }
.signal-head .note { margin: 0; }

.track {
  display: flex; align-items: flex-end; gap: 3px;
  height: 132px; padding: 0 0 1px;
  border-bottom: 1px solid var(--line);
}

.bar {
  flex: 1 1 0; min-width: 0; height: 100%;
  display: flex; align-items: flex-end;
  text-decoration: none; border-radius: 3px 3px 0 0;
  transition: filter .18s ease, transform .18s ease;
}
.bar-fill {
  display: block; width: 100%; height: var(--h, 50%);
  border-radius: 3px 3px 0 0;
  background: var(--c, var(--u1));
  opacity: .78;
  transform-origin: bottom;
  animation: rise .55s cubic-bezier(.2, .85, .25, 1) both;
  animation-delay: calc(var(--i, 0) * 20ms);
  transition: opacity .18s ease;
}
.bar:hover .bar-fill,
.bar:focus-visible .bar-fill { opacity: 1; }
.bar:hover { transform: translateY(-2px); }

.bar[data-kind="present"] .bar-fill {
  background: transparent;
  border: 1px dashed var(--u6);
  border-bottom: 0;
}

.bar[data-unit="1"] { --c: var(--u1); }
.bar[data-unit="2"] { --c: var(--u2); }
.bar[data-unit="3"] { --c: var(--u3); }
.bar[data-unit="4"] { --c: var(--u4); }
.bar[data-unit="5"] { --c: var(--u5); }
.bar[data-unit="6"] { --c: var(--u6); }

.gap {
  flex: 0 0 10px; height: 100%;
  display: flex; align-items: flex-end; justify-content: center;
}
.gap::after {
  content: ""; width: 1px; height: 34%;
  background: repeating-linear-gradient(180deg, var(--line) 0 3px, transparent 3px 7px);
}
.tick {
  flex: 0 0 9px; height: 100%; position: relative;
  display: flex; align-items: flex-end; justify-content: center;
  text-decoration: none;
}
.tick::before {
  content: ""; position: absolute; top: 4px; left: 50%;
  width: 6px; height: 6px; margin-left: -3px;
  background: var(--text-2); transform: rotate(45deg);
}
.tick::after {
  content: ""; width: 1px; height: calc(100% - 14px);
  background: var(--line);
}
.tick:hover::before { background: var(--u6); }

.readout {
  display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: baseline;
  min-height: 46px; margin: 14px 0 0;
  font-family: var(--mono); font-size: 13px; color: var(--muted);
}
.readout b { color: var(--text); font-weight: 500; font-size: 13.5px; }
.readout .rd-date { color: var(--u5); }

.legend {
  list-style: none; display: flex; flex-wrap: wrap; gap: 8px 22px;
  padding: 0; margin: 26px 0 0;
  font-family: var(--mono); font-size: 12px; color: var(--muted);
}
.legend li { display: flex; align-items: center; gap: 8px; }
.legend i {
  width: 22px; height: 4px; border-radius: 2px; background: var(--c);
  display: inline-block;
}

/* ── generic cards / grids ────────────────────────────────── */

.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }

.card {
  background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: var(--r); padding: 24px 26px;
}
.card p { color: var(--text-2); font-size: 16px; }
.card-num {
  font-family: var(--mono); font-size: 12px; color: var(--muted);
  letter-spacing: .1em; display: block; margin-bottom: 12px;
}

.outcomes { list-style: none; padding: 0; margin: 0; counter-reset: oc; }
.outcomes li {
  counter-increment: oc;
  display: grid; grid-template-columns: 42px 1fr; gap: 14px;
  padding: 16px 0; border-top: 1px solid var(--line-soft);
  color: var(--text-2); max-width: 74ch;
}
.outcomes li:first-child { border-top: 0; padding-top: 0; }
.outcomes li::before {
  content: counter(oc, decimal-leading-zero);
  font-family: var(--mono); font-size: 12.5px; color: var(--u4);
  letter-spacing: .04em; padding-top: 5px;
}

.plain { list-style: none; padding: 0; margin: 0; }
.plain li {
  padding: 12px 0 12px 20px; border-top: 1px solid var(--line-soft);
  color: var(--text-2); position: relative; max-width: 72ch;
}
.plain li:first-child { border-top: 0; }
.plain li::before {
  content: ""; position: absolute; left: 0; top: 24px;
  width: 7px; height: 1px; background: var(--u3);
}

/* ── people ───────────────────────────────────────────────── */

.person {
  display: grid; grid-template-columns: auto 1fr; gap: 22px; align-items: start;
  background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: var(--r); padding: 26px 28px;
}
.person-initials {
  width: 62px; height: 62px; border-radius: 50%;
  display: grid; place-items: center;
  font-family: var(--display); font-weight: 700; font-size: 20px; color: #12111a;
  background: linear-gradient(145deg, var(--u4), var(--u6));
}
.person h3 { margin-bottom: 4px; }
.person .role { font-family: var(--mono); font-size: 12px; color: var(--muted); letter-spacing: .06em; margin-bottom: 14px; }
.person-links { display: flex; flex-wrap: wrap; gap: 8px 20px; font-family: var(--mono); font-size: 13px; }

/* ── schedule ─────────────────────────────────────────────── */

.unit-head {
  display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap;
  padding: 0 0 14px; margin: 58px 0 0;
  border-bottom: 1px solid var(--line);
}
.unit-head:first-of-type { margin-top: 0; }
.unit-tag {
  font-family: var(--mono); font-size: 12px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--c, var(--u1));
}
.unit-head h2 { margin: 0; font-size: 1.55rem; }
.unit-head .note { flex-basis: 100%; margin: 4px 0 0; }

.meet {
  display: grid; grid-template-columns: 132px 1fr;
  gap: 26px; padding: 26px 0 26px 18px;
  border-top: 1px solid var(--line-soft);
  border-left: 2px solid var(--c, var(--u1));
  scroll-margin-top: 96px;
}
.meet:first-of-type { border-top: 0; }
.meet-when { font-family: var(--mono); font-size: 12.5px; line-height: 1.6; color: var(--muted); }
.meet-when b { display: block; color: var(--text); font-size: 13px; font-weight: 500; }
.meet-when .n { color: var(--c, var(--u1)); }
.meet h3 { margin-bottom: 14px; }
.meet-flag {
  display: inline-block; margin-left: 10px; vertical-align: middle;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--u5); border: 1px solid #4a3a24; border-radius: 20px; padding: 2px 9px;
}

.papers { list-style: none; padding: 0; margin: 0; }
.papers li { padding: 9px 0; border-top: 1px dotted var(--line); max-width: 72ch; }
.papers li:first-child { border-top: 0; padding-top: 0; }
.paper-title { display: block; color: var(--text); font-size: 16px; line-height: 1.45; }
.paper-meta { display: block; font-family: var(--mono); font-size: 11.5px; color: var(--muted); margin-top: 5px; letter-spacing: .01em; }
.paper-how { color: var(--u5); }

.break-row {
  display: grid; grid-template-columns: 132px 1fr; gap: 26px;
  padding: 18px 0 18px 20px; border-top: 1px solid var(--line-soft);
  font-family: var(--mono); font-size: 12.5px; color: var(--muted);
  background-image: repeating-linear-gradient(90deg, var(--line-soft) 0 6px, transparent 6px 14px);
  background-size: 2px 100%; background-repeat: no-repeat;
}
.due-row {
  display: grid; grid-template-columns: 132px 1fr; gap: 26px;
  padding: 16px 0 16px 20px; border-top: 1px solid var(--line-soft);
  font-family: var(--mono); font-size: 12.5px;
  color: var(--text); border-left: 2px solid var(--u6);
}
.due-row .when { color: var(--u6); }

/* ── tables ───────────────────────────────────────────────── */

.weights { width: 100%; border-collapse: collapse; }
.weights caption { text-align: left; margin-bottom: 16px; color: var(--muted); font-family: var(--mono); font-size: 12.5px; }
.weights th, .weights td { text-align: left; padding: 14px 12px; border-bottom: 1px solid var(--line-soft); vertical-align: middle; }
.weights th {
  font-family: var(--mono); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--muted); font-weight: 400;
}
.weights td:first-child { color: var(--text); }
.weights .pct { font-family: var(--mono); font-size: 14px; color: var(--text); width: 68px; text-align: right; }
.weights .barcell { width: 42%; }
.wbar { height: 7px; border-radius: 4px; background: var(--line); overflow: hidden; }
.wbar i { display: block; height: 100%; border-radius: 4px; background: var(--c, var(--u3)); width: var(--w); }

.dates { list-style: none; padding: 0; margin: 0; }
.dates li {
  display: grid; grid-template-columns: 190px 1fr; gap: 22px;
  padding: 16px 0; border-top: 1px solid var(--line-soft); align-items: baseline;
}
.dates li:first-child { border-top: 0; }
.dates .d { font-family: var(--mono); font-size: 13px; color: var(--u5); }
.dates .t { color: var(--text-2); }
.dates .t b { color: var(--text); font-weight: 600; }

/* ── callout ──────────────────────────────────────────────── */

.callout {
  border: 1px solid var(--line); border-left: 3px solid var(--u4);
  border-radius: var(--r); padding: 22px 26px;
  background: var(--panel); color: var(--text-2);
}
.callout h3 { color: var(--text); }

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: .07em;
  text-transform: uppercase; text-decoration: none;
  padding: 12px 20px; border-radius: 40px;
  border: 1px solid var(--line); color: var(--text);
  transition: border-color .18s ease, color .18s ease;
}
.btn:hover { border-color: var(--u4); color: #fff; }
.btn-lead { border-color: #4a3a24; color: var(--u6); }

/* ── footer ───────────────────────────────────────────────── */

.foot {
  border-top: 1px solid var(--line-soft);
  padding: 40px 0 60px; margin-top: 40px;
  font-family: var(--mono); font-size: 12.5px; color: var(--muted);
}
.foot-inner { display: flex; flex-wrap: wrap; gap: 14px 30px; justify-content: space-between; }
.foot a { color: var(--text-2); }

/* ── responsive ───────────────────────────────────────────── */

@media (max-width: 860px) {
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .track { height: 104px; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .wrap { padding: 0 18px; }
  .hero { padding: 48px 0 36px; }
  .band { padding: 46px 0; }
  .track { height: 88px; gap: 2px; }
  .gap, .tick { flex-basis: 7px; }
  .meet, .break-row, .due-row, .dates li { grid-template-columns: 1fr; gap: 12px; }
  .person { grid-template-columns: 1fr; }
  .weights .barcell { display: none; }
  .nav-inner { padding: 12px 18px; gap: 8px 18px; }
  .nav-mark { flex-basis: 100%; margin-right: 0; }
}

@keyframes rise { from { transform: scaleY(.04); opacity: 0; } to { transform: scaleY(1); opacity: .78; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .bar-fill { animation: none; }
  .bar:hover { transform: none; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}

@media print {
  body { background: #fff; color: #000; }
  .nav, .signal, .skip { display: none; }
  a { color: #000; }
}