:root {
  --paper: #f8f7f3;
  --surface: #ffffff;
  --ink: #1b2430;
  --muted: #66707c;
  --line: #d8d9d6;
  --line-strong: #aeb2b1;
  --accent: #a43f2b;
  --accent-soft: #f3ebe7;
  --content: 1180px;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--paper);
}

a {
  color: inherit;
}

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

.skip-link {
  position: fixed;
  z-index: 10;
  top: 8px;
  left: 8px;
  transform: translateY(-160%);
  padding: 8px 12px;
  color: white;
  background: var(--ink);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header,
.site-footer,
main {
  width: min(var(--content), calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 58px;
  border-bottom: 1px solid var(--line-strong);
}

.brand {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 700;
}

.brand-mark {
  color: var(--accent);
  font-family: Georgia, serif;
  font-size: 1.3rem;
  line-height: 1;
}

.author {
  color: var(--muted);
  font-size: 0.82rem;
}

main {
  padding-block: 32px 64px;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 0.78rem;
}

.breadcrumbs a {
  text-underline-offset: 3px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 40px;
  align-items: end;
  padding: 4px 0 28px;
  border-bottom: 1px solid var(--line-strong);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 860px;
  margin-bottom: 10px;
  font-size: clamp(2rem, 4.2vw, 3.35rem);
  font-weight: 650;
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.hero-copy {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.5;
}

.hero-note {
  display: flex;
  gap: 8px;
  align-items: baseline;
  justify-content: flex-end;
  max-width: 250px;
  padding: 0 0 3px;
}

.hero-note strong {
  color: var(--accent);
  font-size: 1.7rem;
  line-height: 1;
}

.hero-note p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.35;
}

.section-heading {
  display: flex;
  gap: 20px;
  align-items: baseline;
  justify-content: space-between;
  margin: 0 0 12px;
  padding-top: 24px;
}

.section-heading h2 {
  margin-bottom: 0;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-heading p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.course-grid,
.period-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.period-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.course-card,
.period-card {
  min-height: 122px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  background: var(--surface);
  text-decoration: none;
  transition: border-color 120ms ease, background-color 120ms ease;
}

.course-card:hover,
.period-card:hover {
  border-color: var(--line-strong);
  background: var(--accent-soft);
}

.card-code {
  display: block;
  margin-bottom: 12px;
  color: var(--accent);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.1em;
}

.course-card h2,
.period-card h2 {
  max-width: 520px;
  margin-bottom: 6px;
  font-size: 1.25rem;
  font-weight: 650;
  line-height: 1.2;
}

.course-card p,
.period-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.45;
}

.catalog {
  margin-top: 32px;
}

.category-grid {
  display: grid;
  gap: 30px;
}

.category {
  min-width: 0;
}

.category h2 {
  margin-bottom: 10px;
  font-size: 1.05rem;
  font-weight: 700;
}

.material-list {
  border-top: 1px solid var(--line-strong);
}

.material-list-header,
.material-card {
  display: grid;
  grid-template-columns: minmax(165px, 0.75fr) minmax(300px, 1.8fr) minmax(150px, 0.9fr);
  gap: 18px;
  align-items: baseline;
}

body[data-course][data-term] .material-list-header,
body[data-course][data-term] .material-card {
  grid-template-columns: minmax(110px, 0.45fr) minmax(300px, 2fr) minmax(150px, 0.9fr);
}

.material-list-header {
  padding: 7px 12px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  background: #eeefec;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.material-list-header span:last-child {
  text-align: right;
}

.material-card {
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  background: transparent;
  transition: background-color 100ms ease;
}

.material-card:hover {
  background: var(--surface);
}

.material-card h3 {
  margin-bottom: 0;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.35;
}

.material-card a {
  text-decoration-color: var(--line-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.material-card a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.material-card a::after {
  margin-left: 0.35em;
  color: var(--accent);
  content: "↓";
  text-decoration: none;
}

.material-meta,
.material-topics {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.4;
}

.material-topics {
  text-align: right;
}

.empty-state {
  margin-bottom: 0;
  padding: 16px 12px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.empty-state--error {
  color: var(--accent);
}

.policy-note {
  margin-top: 34px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.policy-note h2 {
  margin-bottom: 4px;
  font-size: 0.85rem;
  font-weight: 700;
}

.policy-note p {
  max-width: 900px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.5;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  padding-block: 20px 32px;
  border-top: 1px solid var(--line-strong);
  color: var(--muted);
  font-size: 0.74rem;
}

.site-footer p {
  margin-bottom: 0;
}

@media (max-width: 760px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .hero-note {
    justify-content: flex-start;
    max-width: none;
  }

  .course-grid {
    grid-template-columns: 1fr;
  }

  .material-list-header {
    display: none;
  }

  .material-card,
  body[data-course][data-term] .material-card {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 12px 4px;
  }

  .material-card h3 {
    grid-row: 1;
  }

  .material-meta {
    grid-row: 2;
  }

  .material-topics {
    grid-row: 3;
    text-align: left;
  }
}

@media (max-width: 520px) {
  .site-header,
  .site-footer,
  main {
    width: min(100% - 24px, var(--content));
  }

  .site-header {
    min-height: 52px;
  }

  main {
    padding-block: 24px 48px;
  }

  h1 {
    font-size: clamp(1.8rem, 10vw, 2.5rem);
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 3px;
  }

  .course-card,
  .period-card {
    min-height: auto;
    padding: 16px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .course-card,
  .period-card,
  .material-card {
    transition: none;
  }
}