:root {
  color-scheme: light;
  --ink: #1a1815;
  --paper: #faf8f3;
  --graphite: #6f695e;
  --hairline: #e6e1d6;
  --bronze: #8a6d42;
  --measure: 42rem;
  --serif: "Newsreader", Georgia, serif;
  --mono: "IBM Plex Mono", monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--ink);
  color: var(--paper);
}

.page {
  width: min(100%, var(--measure));
  margin: 0 auto;
  padding: 8.5rem 1.75rem 5rem;
}

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--hairline);
  text-underline-offset: 4px;
  transition: text-decoration-color 0.25s ease;
}

a:hover {
  text-decoration-color: var(--bronze);
}

a:focus-visible {
  outline: 1px solid var(--ink);
  outline-offset: 4px;
  text-decoration: none;
}

.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 10;
  padding: 0.6rem 0.8rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.75rem;
  transform: translateY(-200%);
}

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

.eyebrow,
.quiet-link,
.experiment-number,
.github-link {
  font-family: var(--mono);
}

.eyebrow {
  font-size: 0.6563rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--graphite);
}

.folio {
  display: inline-block;
  min-width: 3.4em;
  color: var(--bronze);
}

/* ---------- masthead ---------- */

.masthead .eyebrow {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.masthead .eyebrow::after {
  content: "";
  flex: 0 0 3.5rem;
  height: 1px;
  background: var(--hairline);
}

.wordmark {
  margin-top: 1.4rem;
  font-size: clamp(5.5rem, 19vw, 9rem);
  font-weight: 300;
  line-height: 0.86;
  letter-spacing: -0.045em;
}

.dek {
  max-width: 30rem;
  margin-top: 2rem;
  color: var(--graphite);
  font-size: 1.3rem;
  font-weight: 300;
  font-style: italic;
  line-height: 1.5;
}

/* ---------- long tail figure ---------- */

.tail {
  margin: 5.5rem 0 5rem;
}

.tail svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.tail-curve {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1;
}

.tail-point {
  fill: var(--bronze);
}

.tail-label {
  fill: var(--graphite);
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: no-preference) {
  .tail-curve {
    stroke-dasharray: 900;
    stroke-dashoffset: 900;
    animation: draw 2s cubic-bezier(0.4, 0, 0.2, 1) 0.3s forwards;
  }

  .tail-point {
    opacity: 0;
    animation: appear 0.6s ease 2.15s forwards;
  }

  .tail-label {
    opacity: 0;
    animation: appear 0.6s ease 2.3s forwards;
  }

  @keyframes draw {
    to {
      stroke-dashoffset: 0;
    }
  }

  @keyframes appear {
    to {
      opacity: 1;
    }
  }
}

/* ---------- sections ---------- */

section {
  margin-bottom: 5rem;
}

section > .eyebrow {
  display: block;
  margin-bottom: 1.6rem;
}

.lede {
  font-size: 1.28rem;
  line-height: 1.6;
}

section > p:not(.eyebrow) + p {
  margin-top: 1.2em;
  color: var(--graphite);
}

.rule {
  width: 3.5rem;
  margin: 0 0 5rem;
  border: 0;
  border-top: 1px solid var(--hairline);
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.6rem;
}

.section-heading .eyebrow {
  flex-shrink: 0;
  margin-bottom: 0;
}

.quiet-link {
  color: var(--graphite);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
}

.quiet-link:hover,
.quiet-link:focus-visible {
  color: var(--bronze);
}

/* ---------- experiments ---------- */

.experiments ol {
  list-style: none;
  border-top: 1px solid var(--ink);
}

.experiments li {
  border-bottom: 1px solid var(--hairline);
}

.experiments li > a {
  display: grid;
  grid-template-columns: 4rem 1fr auto;
  gap: 1.5rem;
  align-items: start;
  padding: 1.6rem 0;
  text-decoration: none;
}

.experiments li > a:hover .arrow,
.experiments li > a:focus-visible .arrow {
  color: var(--bronze);
  transform: translateX(0.35rem);
}

.experiments li > a:hover strong,
.experiments li > a:focus-visible strong {
  color: var(--bronze);
}

.experiment-number {
  padding-top: 0.3rem;
  color: var(--graphite);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.experiment-copy {
  display: block;
}

.experiment-copy strong {
  display: block;
  font-size: 1.22rem;
  font-weight: 500;
  line-height: 1.35;
  transition: color 0.25s ease;
}

.experiment-copy small {
  display: block;
  max-width: 30rem;
  margin-top: 0.4rem;
  color: var(--graphite);
  font-size: 0.94rem;
  font-weight: 300;
  line-height: 1.55;
}

.arrow {
  padding-top: 0.15rem;
  font-size: 1rem;
  transition: transform 0.25s ease, color 0.25s ease;
}

/* ---------- invitation ---------- */

.invitation {
  margin-top: 6.5rem;
  padding-top: 0.25rem;
}

.invitation-line {
  max-width: 32rem;
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  font-weight: 300;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.invitation-line em {
  font-weight: 300;
}

.invitation-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  margin-top: 2.25rem;
  font-size: 1.05rem;
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 0.2rem;
  transition: border-color 0.25s ease;
}

.invitation-link:hover {
  border-color: var(--bronze);
}

.invitation-link:hover .arrow {
  color: var(--bronze);
  transform: translateX(0.35rem);
}

/* ---------- footer ---------- */

footer {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.25rem;
  align-items: baseline;
  margin-top: 7rem;
  padding-top: 2.25rem;
  border-top: 1px solid var(--ink);
}

.laboratory-name {
  font-size: 1.15rem;
  font-weight: 500;
}

.footer-note {
  color: var(--graphite);
  font-size: 0.92rem;
  font-weight: 300;
  font-style: italic;
}

.github-link {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--graphite);
}

.github-link:hover,
.github-link:focus-visible {
  color: var(--bronze);
}

/* ---------- small screens ---------- */

@media (max-width: 520px) {
  .page {
    padding-top: 5rem;
  }

  .wordmark {
    font-size: clamp(4.8rem, 26vw, 6.5rem);
  }

  .tail {
    margin: 4.25rem 0 4rem;
  }

  .tail-label {
    transform: translateX(-70px);
  }

  .section-heading {
    align-items: flex-start;
  }

  .experiments li > a {
    grid-template-columns: 3rem 1fr auto;
    gap: 0.9rem;
  }

  footer {
    grid-template-columns: 1fr auto;
  }

  .footer-note {
    grid-column: 1 / -1;
    grid-row: 2;
  }
}