styles.css

:root {
  --background: #efece4;
  --ink: #161714;
  --muted: #62655e;
  --line: #bfc1b9;
  --lime: #c9ff4a;
  --panel: #f8f6ef;
  font-family: ui-sans-serif, system-ui, sans-serif;
  color: var(--ink);
  background: var(--background);
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  margin: 0;
}

.site-header,
main,
footer {
  width: min(1160px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  color: inherit;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.site-header span {
  color: var(--muted);
  font: 700 0.72rem ui-monospace, monospace;
  text-transform: uppercase;
}

.site-header i {
  width: 8px;
  height: 8px;
  display: inline-block;
  margin-right: 8px;
  border-radius: 50%;
  background: #36a866;
}

.hero {
  padding: 120px 0 100px;
}

.eyebrow,
.route,
.number {
  color: #4c6500;
  font: 800 0.72rem/1.4 ui-monospace, monospace;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 11ch;
  margin: 20px 0 30px;
  font-size: clamp(3.9rem, 9vw, 8rem);
  line-height: 0.89;
  letter-spacing: -0.07em;
}

.hero > p:last-child {
  max-width: 710px;
  color: var(--muted);
  font-size: 1.22rem;
  line-height: 1.65;
}

code {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

.lab {
  padding-bottom: 120px;
}

.section-heading,
.experiment {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(360px, 1.2fr);
  gap: 64px;
  border-top: 1px solid var(--line);
}

.section-heading {
  padding: 18px 0;
}

.section-heading h2,
.section-heading p {
  margin: 0;
  font-size: 0.8rem;
}

.section-heading p {
  color: var(--muted);
}

.experiment {
  padding: 42px 0;
}

.experiment-copy {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 18px;
}

.route {
  margin: 0 0 16px;
}

.experiment h3 {
  margin: 0 0 12px;
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  letter-spacing: -0.045em;
}

.experiment-copy div > p:last-child {
  color: var(--muted);
  line-height: 1.65;
}

form,
.viewer-demo {
  align-self: start;
  padding: 24px;
  border: 1px solid var(--line);
  background: var(--panel);
}

label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.78rem;
  font-weight: 800;
}

.control-row {
  display: flex;
  gap: 8px;
}

input,
button {
  min-height: 48px;
  border: 1px solid var(--ink);
  border-radius: 0;
  font: inherit;
}

input {
  min-width: 0;
  flex: 1;
  padding: 0 13px;
  background: transparent;
  color: inherit;
}

button {
  padding: 0 17px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

button:hover {
  background: var(--lime);
}

button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 2px solid #3276da;
  outline-offset: 2px;
}

input:focus-visible {
  outline: 2px solid #3276da;
  outline-offset: -1px;
}

pre {
  overflow-x: auto;
  margin: 18px 0 0;
  padding: 18px;
  background: #20221e;
  color: #e9f2d0;
  font: 0.8rem/1.65 ui-monospace, monospace;
}

.anatomy {
  display: grid;
  grid-template-columns: 0.65fr 1fr;
  gap: 64px;
  align-items: start;
  padding: 90px 0 120px;
  border-top: 1px solid var(--line);
}

.anatomy .eyebrow {
  grid-column: 1;
}

.anatomy h2 {
  grid-column: 1;
  margin: 8px 0 0;
  font-size: clamp(2.5rem, 5vw, 4.8rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.anatomy pre {
  grid-column: 2;
  grid-row: 1 / span 2;
  margin: 0;
  padding: 30px;
  box-shadow: 12px 12px 0 var(--lime);
}

footer {
  display: flex;
  justify-content: space-between;
  padding: 28px 0 52px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

footer a {
  color: inherit;
}

@media (max-width: 760px) {
  .section-heading,
  .experiment,
  .anatomy {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .anatomy .eyebrow,
  .anatomy h2,
  .anatomy pre {
    grid-column: 1;
    grid-row: auto;
  }

  .control-row {
    flex-direction: column;
  }

}

@media (max-width: 520px) {
  .site-header span {
    display: none;
  }

  .hero {
    padding-top: 84px;
  }

  footer {
    flex-direction: column;
    gap: 10px;
  }
}