:root {
  --paper: #f7f4ed;
  --paper-raised: #fcfaf5;
  --ink: #17212b;
  --slate: #425466;
  --muted: #657383;
  --blue: #245a9a;
  --blue-pale: #edf4fb;
  --rule: #cbd3dc;
  --rule-soft: #dfe4e8;
  --serif: Georgia, "Times New Roman", Times, serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --max-width: 1120px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-color: color-mix(in srgb, currentColor 45%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-color: currentColor;
}

a:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  color: #fff;
  background: var(--ink);
  transform: translateY(-150%);
  transition: transform 160ms ease;
}

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

.shell {
  width: min(calc(100% - 3rem), var(--max-width));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 244, 237, 0.96);
  border-bottom: 1px solid var(--rule);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.5rem;
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.75rem;
  min-height: 44px;
  text-decoration: none;
}

.wordmark-code,
.eyebrow,
.section-heading > p,
.course-detail dt,
.reading-group-heading > span,
.future-grid article > p {
  font-size: 0.72rem;
  font-weight: 760;
  line-height: 1.2;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.wordmark-code {
  color: var(--blue);
}

.wordmark-title {
  color: var(--slate);
  font-family: var(--serif);
  font-size: 1rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.4rem 0.65rem;
  color: var(--slate);
  font-size: 0.84rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--blue);
}

.hero {
  padding-block: clamp(4.5rem, 8vw, 7rem);
  border-bottom: 1px solid var(--rule);
}

.eyebrow {
  margin: 0 0 1.4rem;
  color: var(--blue);
}

.hero h1 {
  max-width: 960px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3.25rem, 7vw, 5.6rem);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.hero h1 em {
  color: var(--blue);
  font-weight: 500;
}

.course-details {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 1050px;
  margin: 2.75rem 0 0;
  border-block: 1px solid var(--rule);
}

.course-detail {
  padding: 0.95rem 1.2rem 1rem 0;
}

.course-detail + .course-detail {
  padding-left: 1.2rem;
  border-left: 1px solid var(--rule);
}

.course-detail dt {
  margin-bottom: 0.35rem;
  color: var(--muted);
}

.course-detail dd {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 700;
}

.course-detail a {
  color: var(--blue);
}

.course-detail abbr {
  text-decoration: none;
}

.course-location {
  display: block;
  margin-top: 0.25rem;
  color: var(--slate);
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.35;
}

.section {
  padding-block: clamp(4rem, 7vw, 6.25rem);
  scroll-margin-top: 5rem;
}

.section-heading {
  display: grid;
  grid-template-columns: 9rem minmax(0, 1fr);
  gap: 2rem;
  align-items: end;
  margin-bottom: 3rem;
}

.section-heading > p {
  margin: 0 0 0.55rem;
  color: var(--muted);
}

.section-heading h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.035em;
}

.topics {
  background: #f0ede5;
  border-bottom: 1px solid var(--rule);
}

.topic-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--slate);
  list-style: none;
}

.topic-item {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: 1.5rem;
  padding-block: 1.65rem;
  border-bottom: 1px solid var(--rule);
}

.topic-number {
  color: var(--blue);
  font-family: var(--serif);
  font-size: 1.2rem;
  font-style: italic;
}

.topic-item h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
  font-weight: 600;
  line-height: 1.2;
}

.concept-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0;
  margin: 0.6rem 0 0;
  padding: 0;
  color: var(--slate);
  font-size: 0.86rem;
  list-style: none;
}

.concept-list li + li::before {
  margin-inline: 0.55rem;
  color: var(--muted);
  content: "·";
}

.extensions {
  margin: 1.5rem 0 0 5rem;
  color: var(--slate);
  font-size: 0.84rem;
}

.reading-groups {
  border-top: 1px solid var(--slate);
}

.reading-group {
  display: grid;
  grid-template-columns: minmax(10rem, 0.28fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 5rem);
  padding-block: 2.4rem;
  border-bottom: 1px solid var(--rule);
}

.reading-group-heading > span {
  color: var(--blue);
}

.reading-group-heading h3 {
  margin: 0.65rem 0 0;
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1.2;
}

.reading-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.reading-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(10rem, 17rem);
  gap: 1.5rem;
  align-items: baseline;
  padding-block: 0.9rem;
  border-top: 1px solid var(--rule-soft);
}

.reading-list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.reading-list li:last-child {
  padding-bottom: 0;
}

.reading-list a {
  font-family: var(--serif);
  font-size: 1.06rem;
  font-weight: 600;
  line-height: 1.35;
  text-decoration: none;
}

.reading-list a:hover {
  color: var(--blue);
}

.resource-label {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--blue);
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 780;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.reading-meta {
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.4;
  text-align: right;
}

.future-materials {
  padding-block: 0;
  background: var(--blue-pale);
  border-block: 1px solid var(--rule);
}

.future-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}

.future-grid article {
  min-height: 11rem;
  padding: 2.5rem 0;
  scroll-margin-top: 5.5rem;
}

.future-grid article + article {
  padding-left: 3rem;
  border-left: 1px solid var(--rule);
}

.future-grid article > p {
  margin: 0 0 2rem;
  color: var(--muted);
}

.future-grid h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 500;
}

.lecture-list {
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.lecture-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 1rem;
  padding-block: 0.8rem;
  border-top: 1px solid var(--rule);
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
}

.lecture-list a {
  text-decoration: none;
}

.lecture-list a:hover {
  color: var(--blue);
}

.lecture-number,
.lecture-format {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 760;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.lecture-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.8rem;
  white-space: nowrap;
}

.site-footer {
  padding-block: 2.2rem;
  color: #dce2e6;
  background: var(--ink);
}

.site-footer p {
  margin: 0;
  font-family: var(--serif);
  font-size: 0.95rem;
}

@media (max-width: 760px) {
  .shell {
    width: min(calc(100% - 2rem), var(--max-width));
  }

  .header-inner {
    gap: 0.75rem;
    min-height: 4.1rem;
  }

  .wordmark-title {
    display: none;
  }

  .site-nav a {
    padding-inline: 0.42rem;
    font-size: 0.78rem;
  }

  .hero {
    padding-block: 4rem;
  }

  .hero h1 {
    font-size: clamp(3rem, 13vw, 4.8rem);
  }

  .course-details {
    grid-template-columns: 1fr;
    margin-top: 2.25rem;
  }

  .course-detail,
  .course-detail + .course-detail {
    padding: 0.75rem 0;
    border-left: 0;
  }

  .course-detail + .course-detail {
    border-top: 1px solid var(--rule-soft);
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 0.65rem;
    margin-bottom: 2rem;
  }

  .section-heading > p {
    margin: 0;
  }

  .topic-item {
    grid-template-columns: 2.4rem minmax(0, 1fr);
    gap: 0.85rem;
  }

  .extensions {
    margin-left: 3.25rem;
  }

  .reading-group {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .reading-group-heading {
    max-width: 32rem;
  }

  .reading-list li {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .reading-meta {
    text-align: left;
  }

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

  .future-grid article {
    min-height: 0;
    padding: 2rem 0;
  }

  .future-grid article + article {
    padding-left: 0;
    border-top: 1px solid var(--rule);
    border-left: 0;
  }

  .future-grid article > p {
    margin-bottom: 0.8rem;
  }
}

@media (max-width: 430px) {
  .site-nav a {
    padding-inline: 0.32rem;
    font-size: 0.72rem;
  }

  .wordmark-code {
    font-size: 0.67rem;
  }

  .lecture-list li {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.35rem 0.8rem;
  }

  .lecture-actions {
    grid-column: 2;
    justify-content: flex-start;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

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

  body {
    background: #fff;
    font-size: 11pt;
  }

  .hero,
  .section {
    padding-block: 2rem;
  }

  .topic-item,
  .reading-group,
  .reading-list li {
    break-inside: avoid;
  }
}