:root {
  --crimson: #981e32;
  --crimson-ink: #7a1828;
  --ink: #1c1c1c;
  --muted: #5a5a57;
  --line: #dcdcd6;
  --bg: #f6f6f4;
  --card: #ffffff;
  --focus: #0b57d0;
  --sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --max: 58rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.5;
}

a {
  color: var(--crimson-ink);
}

a:hover {
  color: var(--crimson);
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -3.5rem;
  z-index: 20;
  padding: 0.45rem 0.7rem;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
}

.skip-link:focus {
  top: 0.75rem;
}

.site-header {
  border-top: 4px solid var(--crimson);
  border-bottom: 1px solid var(--line);
  background: var(--card);
}

.header-inner,
.intro-inner,
.toolbar-inner,
.catalog-inner,
.footer-inner {
  width: min(calc(100% - 1.5rem), var(--max));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 0.65rem 1.25rem;
  padding: 0.85rem 0 0;
}

.brand-kicker,
.brand-terms,
.filter-group legend,
.meta-label,
.prefix-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.brand-title {
  display: inline-block;
  margin-top: 0.15rem;
  color: var(--ink);
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand-title:hover {
  color: var(--crimson);
}

.primary-nav {
  display: flex;
  gap: 0.15rem;
}

.primary-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.7rem 0.7rem 0.75rem;
  border-bottom: 2px solid transparent;
  font-size: 0.92rem;
  font-weight: 600;
}

.primary-nav a:hover,
.primary-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--crimson);
}

.intro {
  padding: 1.1rem 0 0.35rem;
}

.intro h1 {
  margin: 0 0 0.25rem;
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.lede {
  margin: 0;
  max-width: 42rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.prefix-note {
  margin-top: 0.45rem;
}

.toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  padding: 0.7rem 0 0.8rem;
  background: color-mix(in srgb, var(--bg) 92%, #fff);
  border-bottom: 1px solid var(--line);
}

.search-field {
  display: block;
}

#search {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid #cfcfc8;
  border-radius: 2px;
  background: var(--card);
  color: var(--ink);
  font: inherit;
}

#search:focus {
  border-color: var(--crimson);
  box-shadow: 0 0 0 3px rgba(152, 30, 50, 0.12);
  outline: none;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.1rem;
  margin-top: 0.65rem;
}

.filter-group {
  margin: 0;
  padding: 0;
  border: 0;
}

.filter-group[hidden] {
  display: none;
}

.filter-group legend {
  margin-bottom: 0.3rem;
}

.chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin: 0 0.25rem 0.25rem 0;
  padding: 0.18rem 0.55rem;
  border: 1px solid var(--line);
  background: var(--card);
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
}

.chip input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.chip:has(input:checked) {
  border-color: var(--crimson);
  background: #f8eef0;
  color: var(--crimson-ink);
  font-weight: 600;
}

.chip:has(input:focus-visible) {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.catalog {
  padding: 1rem 0 3rem;
}

.catalog-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  align-items: baseline;
  margin-bottom: 0.55rem;
}

.catalog-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.result-count {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.policy {
  margin: 0 0 0.85rem;
  padding: 0.55rem 0.7rem;
  border-left: 3px solid var(--crimson);
  background: #f3f3f0;
  color: #3d3d3a;
  font-size: 0.88rem;
}

.course-list {
  border-top: 1px solid var(--line);
  background: var(--card);
}

.course {
  padding: 0.85rem 0.2rem 0.9rem;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 7.25rem;
}

.course:target,
.course.is-target {
  background: #fff8f8;
  box-shadow: inset 3px 0 0 var(--crimson);
  padding-left: 0.7rem;
}

.course-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.7rem;
  margin-bottom: 0.15rem;
}

.course-code {
  color: var(--crimson);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.course-code:hover {
  text-decoration: underline;
}

.course h2 {
  margin: 0;
  flex: 1 1 12rem;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-left: auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badge-m {
  padding: 0.05rem 0.35rem;
  background: var(--crimson);
  color: #fff;
}

.course-body {
  display: grid;
  gap: 0.35rem;
}

.course p {
  margin: 0;
  max-width: 62ch;
}

.prereq {
  color: #333;
  font-size: 0.92rem;
}

.desc {
  font-size: 0.95rem;
}

.meta-label {
  display: inline;
  margin-right: 0.4rem;
}

.crosslist,
.repeatable,
.grading,
.offered,
.recommended {
  color: var(--muted);
  font-size: 0.88rem;
}

mark {
  background: #f3e3a6;
  color: inherit;
  padding: 0 0.08em;
}

.empty-state {
  padding: 1.6rem 0.2rem;
  color: var(--muted);
}

.empty-state p {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.empty-state button,
.text-link {
  font: inherit;
  font-weight: 600;
  color: var(--crimson-ink);
  background: none;
  border: 0;
  padding: 0;
  text-decoration: underline;
  cursor: pointer;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.25rem 0 1.6rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer p {
  margin: 0 0 0.55rem;
  max-width: 48rem;
}

.footer-meta {
  font-size: 0.82rem;
}

@media (max-width: 720px) {
  .header-inner,
  .intro-inner,
  .toolbar-inner,
  .catalog-inner,
  .footer-inner {
    width: min(calc(100% - 1.15rem), var(--max));
  }

  .primary-nav a {
    padding-inline: 0.5rem;
  }

  .badges {
    margin-left: 0;
    width: 100%;
  }

  .course h2 {
    flex-basis: 100%;
  }
}

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

@media print {
  .site-header,
  .toolbar,
  .skip-link {
    display: none;
  }

  body,
  .course-list {
    background: #fff;
  }
}