:root {
  color-scheme: light dark;
  --paper: #fdf6e3;
  --paper-alt: #eee8d5;
  --ink: #073642;
  --muted: #586e75;
  --rule: #93a1a1;
  --link: #007a8a;
  --link-visited: #6c5a9e;
  --accent: #b45f06;
  --selection: #b9d7d9;
  --sans:
    "Atkinson Hyperlegible", "Noto Sans", "Segoe UI", system-ui, sans-serif;
  --mono:
    "SFMono-Regular", Consolas, "Liberation Mono", ui-monospace, monospace;
  --page: min(76rem, calc(100% - 3rem));
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #002b36;
    --paper-alt: #073642;
    --ink: #eee8d5;
    --muted: #93a1a1;
    --rule: #586e75;
    --link: #2aa198;
    --link-visited: #b589c7;
    --accent: #cb8d20;
    --selection: #245665;
  }
}

* {
  box-sizing: border-box;
}
html {
  background: var(--paper);
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.65;
}
::selection {
  background: var(--selection);
  color: var(--ink);
}
a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:visited {
  color: var(--link-visited);
}
a:hover {
  color: var(--accent);
  text-decoration-thickness: 2px;
}
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
img {
  display: block;
  height: auto;
  max-width: 100%;
}
h1,
h2,
h3,
p,
ul,
ol,
figure {
  margin-top: 0;
}
h1,
h2,
h3 {
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.13;
}
h1 {
  font-size: clamp(2.35rem, 5vw, 4.5rem);
  letter-spacing: -0.045em;
  margin-bottom: 1.25rem;
}
h2 {
  font-size: clamp(1.55rem, 3vw, 2.4rem);
  letter-spacing: -0.025em;
  margin-bottom: 0.85rem;
}
h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}
p {
  max-width: 70ch;
}

.skip-link {
  background: var(--ink);
  color: var(--paper);
  left: 1rem;
  padding: 0.55rem 0.8rem;
  position: absolute;
  top: -5rem;
  z-index: 2;
}
.skip-link:focus {
  top: 1rem;
}
.site-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: 1.5rem;
  margin: 0 auto;
  width: var(--page);
}
.site-header {
  border-bottom: 1px solid var(--rule);
}
.site-header__inner {
  align-items: baseline;
  min-height: 4.5rem;
  padding: 1rem 0;
}
.site-title {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.94rem;
  font-weight: 700;
  grid-column: span 4;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.site-title:visited {
  color: var(--ink);
}
.site-title::before {
  color: var(--accent);
  content: ">_ ";
}
.site-nav {
  grid-column: 6 / -1;
}
.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.3rem;
  justify-content: flex-end;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  font-family: var(--mono);
  font-size: 0.9rem;
  text-decoration: none;
}
.site-nav a::before {
  color: var(--accent);
  content: "./";
}
.site-nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 0.35em;
}

.site-main {
  min-height: calc(100vh - 9rem);
}
.page {
  grid-column: 3 / span 8;
  padding: 5.5rem 0 6.5rem;
}
.page--wide {
  grid-column: 1 / -1;
}
.eyebrow,
.label,
.meta,
.site-footer {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.84rem;
  letter-spacing: 0.02em;
}
.eyebrow {
  color: var(--accent);
  margin-bottom: 1rem;
}
.eyebrow::before,
.label::before {
  content: "// ";
}
.page-header {
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2.5rem;
  padding-bottom: 1.4rem;
}
.page-header h1 {
  margin-bottom: 0;
}
.page-content h2 {
  margin-top: 3rem;
}
.page-content h3 {
  margin-top: 2rem;
}
.page-content li {
  margin-bottom: 0.5rem;
}
.page-content li::marker {
  color: var(--accent);
}
.note {
  border-left: 3px solid var(--accent);
  color: var(--muted);
  font-size: 0.95rem;
  margin: 2.5rem 0;
  max-width: 70ch;
  padding-left: 1rem;
}

.hero {
  padding: 5rem 0 4rem;
}
.hero__copy {
  grid-column: 1 / span 8;
}
.hero__photo {
  grid-column: 10 / span 3;
  margin: 0;
  padding-top: 0.6rem;
}
.hero__photo img {
  border: 1px solid var(--rule);
  filter: grayscale(1) contrast(1.08);
  width: 100%;
}
.hero__photo figcaption {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
  margin-top: 0.5rem;
}
.lede {
  color: var(--muted);
  font-size: clamp(1.16rem, 2vw, 1.35rem);
  line-height: 1.55;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.4rem;
  margin: 2rem 0 0;
}
.button {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 0.65rem 0.8rem;
  text-decoration: none;
}
.button:visited {
  color: var(--paper);
}
.button:hover {
  background: var(--accent);
  color: var(--paper);
}
.button::before {
  content: "$ ";
}
.text-action {
  align-self: center;
  font-family: var(--mono);
  font-size: 0.9rem;
}
.home-section {
  border-top: 1px solid var(--rule);
  padding: 2.75rem 0;
}
.home-section__label {
  grid-column: 1 / span 2;
}
.home-section__content {
  grid-column: 4 / span 7;
}
.home-section__content p {
  color: var(--muted);
}
.link-list {
  border-top: 1px solid var(--rule);
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
}
.link-list li {
  align-items: baseline;
  border-bottom: 1px solid var(--rule);
  display: grid;
  gap: 1rem;
  grid-template-columns: 10rem minmax(0, 1fr) auto;
  padding: 1rem 0;
}
.link-list .number {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
}
.link-list p {
  font-size: 1rem;
  margin: 0;
}
.link-list a {
  font-family: var(--mono);
  font-size: 0.85rem;
  white-space: nowrap;
}

.term {
  border-top: 1px solid var(--rule);
  margin: 2rem 0;
}
.term summary {
  align-items: baseline;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  list-style: none;
  padding: 1rem 0;
}
.term summary::-webkit-details-marker {
  display: none;
}
.term__name {
  font-size: 1.5rem;
  font-weight: 700;
}
.term__count {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}
.course-list {
  border-top: 1px solid var(--rule);
}
.course {
  border-bottom: 1px solid var(--rule);
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr) auto;
  padding: 1.1rem 0;
}
.course h2 {
  font-size: 1.25rem;
  margin: 0;
}
.course p {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.84rem;
  margin: 0;
  text-align: right;
}
.course-page__meeting {
  border-bottom: 1px solid var(--rule);
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.94rem;
  margin: 2rem 0;
  padding: 0.9rem 0;
}
.course-page__meeting strong {
  color: var(--ink);
}
.archive-list {
  border-top: 1px solid var(--rule);
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}
.archive-list li {
  border-bottom: 1px solid var(--rule);
  padding: 0.9rem 0;
}
.site-footer {
  border-top: 1px solid var(--rule);
}
.site-footer__inner {
  padding: 1.3rem 0;
}
.site-footer p {
  grid-column: span 6;
  margin: 0;
}
.site-footer p:last-child {
  text-align: right;
}

@media (max-width: 760px) {
  :root {
    --page: min(calc(100% - 2rem), 42rem);
  }
  body {
    font-size: 17px;
  }
  .site-grid {
    display: block;
  }
  .site-header__inner {
    padding: 1rem 0;
  }
  .site-nav ul {
    justify-content: flex-start;
    margin-top: 0.75rem;
  }
  .page,
  .hero {
    padding: 4rem 0;
  }
  .hero__photo {
    margin-top: 2.5rem;
    max-width: 9rem;
  }
  .home-section {
    padding: 3rem 0;
  }
  .home-section__label {
    margin-bottom: 1rem;
  }
  .link-list li,
  .course {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
  .link-list .number {
    display: none;
  }
  .course p {
    text-align: left;
  }
  .site-footer p:last-child {
    margin-top: 0.35rem;
    text-align: left;
  }
}