:root {
  --bg: #0b0b0b;
  --text: #edebe6;
  --muted: #87857f;
  --rule: #232321;

  --font-sans: 'Inter', ui-sans-serif, system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --measure: 34rem;
  --gutter: 1.75rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1.1875rem;
  line-height: 1.7;
  font-weight: 400;
  letter-spacing: -0.003em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--text);
  color: var(--bg);
}

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

.wrap {
  width: min(100% - (var(--gutter) * 2), var(--measure));
  margin-inline: auto;
}

/* The mark inherits text colour so a single asset works at every size. */
.hero__mark,
.footer__mark {
  fill: currentColor;
  display: block;
  aspect-ratio: 499 / 644;
  height: auto;
}

/* ---------- hero ---------- */

.hero {
  --measure: 56rem;
  min-height: min(52rem, 92svh);
  padding-top: clamp(4rem, 13vh, 7rem);
  padding-bottom: clamp(4rem, 12vh, 6.5rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero__identity {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(1.5rem, 4vw, 2.25rem);
}

.hero__mark {
  flex: 0 0 auto;
  width: clamp(4.25rem, 8vw, 5.25rem);
}

.hero__title {
  align-self: stretch;
  display: flex;
  align-items: center;
  margin: 0;
  padding-left: clamp(1.5rem, 4vw, 2.25rem);
  border-left: 1px solid var(--muted);
  font-size: clamp(2.75rem, 6vw, 3.75rem);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.038em;
  white-space: nowrap;
}

.hero__content {
  width: min(100%, 34rem);
  margin-inline: auto;
}

.hero__statement {
  margin: clamp(3.25rem, 9vh, 5rem) 0 0;
  max-width: 12em;
  font-size: clamp(1.75rem, 6vw, 2.625rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.032em;
  text-wrap: balance;
}

.hero__summary {
  max-width: 31rem;
  margin: 1.5rem 0 0;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--muted);
  text-wrap: pretty;
}

.hero__link {
  display: inline-block;
  align-self: flex-start;
  margin-top: clamp(4.5rem, 10vh, 6.5rem);
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 160ms ease, border-color 160ms ease;
}

.hero__link span {
  display: inline-block;
  margin-left: 0.45rem;
  transition: transform 160ms ease;
}

.hero__link:hover,
.hero__link:focus-visible {
  border-color: var(--text);
}

.hero__link:hover span,
.hero__link:focus-visible span {
  transform: translateY(0.2rem);
}

/* ---------- essay ---------- */

.essay {
  padding-bottom: clamp(5rem, 14vh, 8rem);
  border-top: 1px solid var(--rule);
  padding-top: clamp(3rem, 9vh, 4.5rem);
}

.essay p {
  margin: 0 0 1.6em;
  text-wrap: pretty;
}

.essay .lede {
  font-size: 1.375rem;
  line-height: 1.55;
  letter-spacing: -0.016em;
  margin-bottom: 1.3em;
}

/* Mono, uppercase, muted: the same treatment the brand sheet gives its
   annotation labels. */
.essay h2 {
  margin: clamp(3.5rem, 10vh, 5rem) 0 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.primitives {
  list-style: none;
  margin: 2.25rem 0 2.5rem;
  padding: 0.15rem 0 0.15rem 1.5rem;
  border-left: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 2.05;
  letter-spacing: -0.01em;
}

.question {
  margin: 2.75rem 0 3rem;
  padding: 0;
}

.question p {
  margin: 0;
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.028em;
}

.values {
  list-style: none;
  margin: 2.25rem 0 2.75rem;
  padding: 0;
}

.values li {
  font-size: 1.125rem;
  line-height: 1.5;
  margin-bottom: 1.0625rem;
}

.values li:last-child { margin-bottom: 0; }

.values .over {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 0.35em;
}

.essay .closing {
  margin-bottom: 0;
  font-size: 1.25rem;
  line-height: 1.5;
  letter-spacing: -0.018em;
}

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

.footer {
  border-top: 1px solid var(--rule);
  padding: 2rem 0 2.75rem;
}

.footer__inner {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.footer__mark { width: 0.8rem; }

.footer__link {
  margin-left: auto;
  transition: color 160ms ease;
}

.footer__link:hover,
.footer__link:focus-visible { color: var(--text); }

/* ---------- reveal ---------- */

/* Gated on .js so the essay is fully readable if the script never runs. */
.js .reveal {
  opacity: 0;
  transform: translateY(0.75rem);
  transition: opacity 500ms ease-out, transform 500ms ease-out;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 3px;
}

@media (max-width: 34rem) {
  body { font-size: 1.125rem; }
  .essay .lede { font-size: 1.25rem; }

  .hero {
    --measure: 34rem;
    min-height: auto;
    padding-top: 4rem;
    padding-bottom: 4.5rem;
  }

  .hero__identity {
    align-items: flex-start;
    justify-content: flex-start;
    gap: 1rem;
  }

  .hero__mark {
    width: 3.25rem;
  }

  .hero__title {
    padding-left: 1rem;
    font-size: clamp(2rem, 9vw, 2.25rem);
    white-space: normal;
  }

  .hero__link {
    margin-top: 3rem;
  }
}