:root {
  --bg: oklch(0.145 0.008 75);
  --bg-deep: oklch(0.12 0.007 75);
  --text: oklch(0.96 0.01 95);
  --text-muted: oklch(0.78 0.014 90);
  --text-faint: oklch(0.72 0.016 85);
  --line: oklch(0.96 0.01 95 / 0.14);
  --accent: oklch(0.8 0.04 80);
  --measure: 40rem;
  --header: 4.5rem;
  --sans: "IBM Plex Sans", "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: "IBM Plex Serif", "Iowan Old Style", Palatino, Georgia, serif;
  color-scheme: dark;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-padding-block-start: calc(var(--header) + 1.25rem);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.1875rem;
  font-weight: 400;
  line-height: 1.55;
}

.skip {
  position: absolute;
  inset-inline-start: 1rem;
  top: 0.75rem;
  transform: translateY(-200%);
  z-index: 5;
  padding: 0.55rem 0.8rem;
  background: var(--text);
  color: var(--bg);
  font-family: var(--sans);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
}

.skip:focus {
  transform: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 2;
  height: var(--header);
  background: var(--bg);
}

.frame {
  width: min(76rem, calc(100% - 2 * clamp(1.25rem, 5vw, 6.5rem)));
  margin-inline: auto;
}

.header-bar,
.footer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem 2.5rem;
  min-height: var(--header);
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0;
  color: var(--text);
  font-family: var(--sans);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1;
  text-transform: uppercase;
  text-decoration: none;
}

.mark img {
  width: 2.05rem;
  height: 2.05rem;
  object-fit: contain;
  display: block;
}

a.mark {
  min-height: 2.75rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.25rem 1.75rem;
}

.nav a {
  padding-block: 0.85rem;
  color: var(--text-muted);
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1;
  text-transform: uppercase;
  text-decoration: none;
}

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

:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 4px;
}

::selection {
  background: oklch(0.88 0.025 95);
  color: oklch(0.16 0.008 75);
}

h1,
h2,
h3,
p {
  margin: 0;
}

.hero {
  display: flex;
  align-items: flex-end;
  min-height: calc(100dvh - var(--header));
  padding-block-end: clamp(4.5rem, 12vh, 8.5rem);
}

h1,
.finale h2 {
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

h1 {
  max-width: 11em;
  font-size: clamp(3.1rem, 7.4vw, 7.4rem);
  line-height: 0.94;
}

.lede {
  max-width: 40rem;
  margin-block-start: clamp(2.25rem, 5vh, 3.75rem);
  color: var(--text-muted);
  font-size: clamp(1.3rem, 2vw, 1.65rem);
  line-height: 1.4;
  text-wrap: pretty;
}

.chapter {
  padding-block: clamp(6rem, 16vh, 10.5rem);
}

#mission,
#hypothesis,
#work {
  scroll-margin-top: calc(var(--header) + 1.25rem);
}

.kicker,
.index {
  color: var(--text-faint);
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

.prose {
  max-width: var(--measure);
  margin-block-start: 1.75rem;
}

.prose > :first-child {
  margin-block-start: 0;
}

.prose p {
  text-wrap: pretty;
}

.prose p + p {
  margin-block-start: 1.5rem;
}

h2 {
  max-width: 18em;
  margin-block-start: 1.75rem;
  font-family: var(--sans);
  font-size: clamp(1.85rem, 3vw, 2.7rem);
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.deck {
  max-width: 32rem;
  margin-block-start: 1.35rem;
  color: var(--text-muted);
  font-size: 1.35rem;
  line-height: 1.45;
  text-wrap: pretty;
}

.domains {
  margin-block-start: clamp(3.5rem, 8vh, 5.5rem);
}

.domain {
  max-width: 46rem;
  padding-block: 2.4rem 2.55rem;
  border-block-start: 1px solid var(--line);
}

.domain:last-child {
  border-block-end: 1px solid var(--line);
}

.index {
  font-variant-numeric: tabular-nums;
}

h3 {
  margin-block-start: 0.85rem;
  font-family: var(--sans);
  font-size: clamp(1.45rem, 2.2vw, 1.85rem);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.domain p {
  max-width: var(--measure);
  margin-block-start: 0.85rem;
  text-wrap: pretty;
}

.effect {
  margin-block-start: clamp(4rem, 10vh, 7rem);
}

.effect .prose {
  margin-block-start: 0;
}

.lead {
  font-family: var(--sans);
  font-size: clamp(1.85rem, 3vw, 2.7rem);
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.effect .prose p + p {
  margin-block-start: 1.5rem;
}

.finale {
  display: flex;
  align-items: flex-end;
  min-height: 100dvh;
  padding-block-end: clamp(5rem, 14vh, 9rem);
  background:
    linear-gradient(to bottom, var(--bg), var(--bg-deep) 28%);
}

.finale h2 {
  max-width: 14ch;
  margin-block-start: 0;
  font-size: clamp(2.5rem, 5.5vw, 5.15rem);
  line-height: 1.02;
}

.site-footer {
  background: var(--bg-deep);
  border-block-start: 1px solid var(--line);
}

.footer-bar {
  align-items: baseline;
  padding-block: 1.75rem 2.25rem;
}

.site-footer p:last-child {
  max-width: 36rem;
  color: var(--text-faint);
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.5;
  text-align: end;
  text-wrap: pretty;
}

@media (max-width: 42rem) {
  :root {
    --header: 7rem;
  }

  .header-bar,
  .footer-bar {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 0.35rem;
    padding-block: 0.9rem 0.75rem;
  }

  .site-header {
    height: auto;
  }

  .nav {
    justify-content: flex-start;
    gap: 0.1rem 1.2rem;
  }

  .nav a {
    padding-block: 0.45rem;
  }

  .site-footer p:last-child {
    text-align: start;
  }

  h1 {
    font-size: clamp(2.65rem, 12.5vw, 3.6rem);
  }
}

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}