:root {
  color-scheme: light;
  --paper: #f2efe6;
  --ink: #171815;
  --muted: #696a62;
  --line: rgba(23, 24, 21, 0.2);
  --accent: #df4b2f;
  --acid: #d7ef43;
  --max: 1440px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 1rem;
  left: 1rem;
  padding: 0.65rem 1rem;
  color: white;
  background: var(--ink);
  transform: translateY(-180%);
}

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

.masthead,
main > section,
footer {
  width: min(100%, var(--max));
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 4.5rem);
}

.masthead {
  height: 5.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  letter-spacing: 0.08em;
}

.wordmark > span {
  display: grid;
  width: 2.25rem;
  aspect-ratio: 1;
  place-items: center;
  color: var(--paper);
  background: var(--ink);
  font-weight: 800;
  letter-spacing: -0.12em;
}

.catalog-link,
.primary-link,
.closing a {
  display: inline-flex;
  align-items: center;
  gap: 1.2rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid currentColor;
  font-weight: 650;
}

.hero {
  min-height: calc(100svh - 5.25rem);
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(20rem, 0.75fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 7rem);
  overflow: hidden;
}

.hero-copy {
  padding-block: clamp(4rem, 9vh, 7rem);
  animation: rise 700ms cubic-bezier(.2,.75,.2,1) both;
}

.eyebrow {
  margin: 0 0 1.8rem;
  color: var(--muted);
  font-size: 0.73rem;
  font-weight: 750;
  letter-spacing: 0.16em;
}

h1,
h2,
.course-title {
  font-family: Georgia, "Times New Roman", "Songti SC", serif;
  font-weight: 500;
}

h1 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(3.5rem, 7.25vw, 7.25rem);
  line-height: 0.95;
  letter-spacing: -0.055em;
}

.intro {
  max-width: 35rem;
  margin: 2.5rem 0 2rem;
  color: #454740;
  font-size: clamp(1rem, 1.45vw, 1.25rem);
}

.hero-figure {
  position: relative;
  width: min(36vw, 32rem);
  aspect-ratio: 1;
  justify-self: end;
  animation: figure-in 900ms 100ms cubic-bezier(.2,.75,.2,1) both;
}

.hero-figure::before {
  content: "";
  position: absolute;
  inset: 13%;
  border-radius: 50%;
  background: var(--acid);
}

.orbit {
  position: absolute;
  inset: 0;
  border: 1px solid var(--ink);
  border-radius: 50%;
}

.orbit-one {
  transform: rotate(58deg) scaleX(0.38);
}

.orbit-two {
  transform: rotate(-58deg) scaleX(0.38);
}

.axis {
  position: absolute;
  inset: 0 50%;
  width: 1px;
  background: var(--ink);
  transform: rotate(90deg);
}

.figure-core {
  position: absolute;
  inset: 32%;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--paper);
  background: var(--ink);
  font-size: clamp(2.3rem, 5vw, 5rem);
  font-weight: 850;
  letter-spacing: -0.14em;
}

.figure-core span {
  color: var(--acid);
}

.figure-label {
  position: absolute;
  padding: 0.25rem 0.5rem;
  background: var(--paper);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.label-top { top: -0.35rem; left: 50%; transform: translateX(-50%); }
.label-right { right: -1.2rem; top: 50%; transform: translateY(-50%); }
.label-bottom { bottom: -0.35rem; left: 50%; transform: translateX(-50%); }

.library {
  padding-block: clamp(5rem, 10vw, 9rem);
  border-top: 1px solid var(--ink);
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 2rem;
  margin-bottom: clamp(3rem, 6vw, 5.5rem);
}

.section-heading .eyebrow {
  margin-bottom: 0.75rem;
}

h2 {
  margin: 0;
  font-size: clamp(3rem, 6vw, 5.8rem);
  line-height: 1;
  letter-spacing: -0.05em;
}

.section-heading > p {
  max-width: 24rem;
  margin: 0 0 0.7rem;
  color: var(--muted);
  text-align: right;
}

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

.course-row {
  --course-accent: var(--accent);
  position: relative;
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1.35fr) minmax(17rem, 0.65fr) 3rem;
  gap: clamp(1rem, 3vw, 3.5rem);
  align-items: center;
  min-height: 13rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(1.25rem);
  transition: color 220ms ease, opacity 600ms ease, transform 600ms ease;
}

.course-row.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.course-row::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0 calc(clamp(1.25rem, 4vw, 4.5rem) * -1);
  background: var(--course-accent);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 260ms cubic-bezier(.2,.75,.2,1);
}

.course-row:hover::before,
.course-row:focus-visible::before {
  transform: scaleY(1);
}

.course-row:hover,
.course-row:focus-visible {
  color: white;
  outline: none;
}

.course-number {
  align-self: start;
  padding-top: 0.35rem;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.course-title {
  display: block;
  max-width: 15ch;
  font-size: clamp(2rem, 4vw, 4.2rem);
  line-height: 1.03;
  letter-spacing: -0.04em;
}

.course-detail {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.5rem;
}

.course-description {
  margin: 0;
  color: var(--muted);
  transition: color 220ms ease;
}

.course-row:hover .course-description,
.course-row:focus-visible .course-description {
  color: rgba(255,255,255,0.76);
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.2rem;
  font-size: 0.74rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.course-arrow {
  font-size: 2rem;
  transition: transform 220ms ease;
}

.course-row:hover .course-arrow,
.course-row:focus-visible .course-arrow {
  transform: translate(0.35rem, -0.35rem);
}

.loading,
.error-message {
  padding: 2rem 0;
  color: var(--muted);
}

.closing {
  min-height: 60vh;
  display: grid;
  grid-template-columns: 0.5fr 1.5fr auto;
  align-items: center;
  gap: clamp(2rem, 5vw, 6rem);
  border-top: 1px solid var(--ink);
}

.closing .eyebrow {
  margin: 0;
}

.closing > p:nth-child(2) {
  max-width: 26ch;
  margin: 0;
  font-family: Georgia, "Times New Roman", "Songti SC", serif;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

footer {
  min-height: 6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(2rem); }
}

@keyframes figure-in {
  from { opacity: 0; transform: scale(0.88) rotate(-8deg); }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    align-content: center;
    padding-block: 3rem;
  }

  .hero-copy {
    padding-block: 2rem 0;
  }

  .hero-figure {
    width: min(72vw, 27rem);
    justify-self: center;
  }

  .course-row {
    grid-template-columns: 3rem 1fr 2rem;
  }

  .course-detail {
    grid-column: 2 / 3;
  }

  .course-arrow {
    grid-column: 3;
    grid-row: 1 / span 2;
  }

  .closing {
    grid-template-columns: 1fr;
    align-content: center;
    padding-block: 5rem;
  }

  .closing a {
    justify-self: start;
  }
}

@media (max-width: 600px) {
  .masthead {
    height: 4.5rem;
  }

  .wordmark strong {
    display: none;
  }

  .hero {
    min-height: calc(100svh - 4.5rem);
  }

  h1 {
    font-size: clamp(3rem, 14vw, 4.5rem);
  }

  .section-heading {
    grid-template-columns: 1fr;
  }

  .section-heading > p {
    text-align: left;
  }

  .course-row {
    grid-template-columns: 2.2rem 1fr;
    gap: 1rem;
    min-height: 0;
    padding: 2rem 0;
  }

  .course-detail {
    grid-column: 2;
  }

  .course-arrow {
    display: none;
  }

  .course-title {
    font-size: clamp(2rem, 10vw, 3rem);
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .course-row { opacity: 1; transform: none; }
}