:root {
  --paper: #f3f0e8;
  --ink: #151515;
  --graphite: #575853;
  --accent: #173a63;
  --line: rgba(21, 21, 21, 0.18);
  --max-width: 1540px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
}

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  transform: translateY(-120%);
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: var(--paper);
  z-index: 10;
}

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

.site-shell {
  width: min(100%, var(--max-width));
  min-height: 100vh;
  margin: 0 auto;
  padding: clamp(1.5rem, 3vw, 3.25rem);
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: clamp(2rem, 4vw, 4rem);
}

.site-meta {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-meta__left {
  display: grid;
  gap: 0.65rem;
}

.site-meta__right {
  color: var(--graphite);
  text-align: right;
}

.hero {
  display: grid;
  grid-template-columns: minmax(18rem, 0.78fr) minmax(26rem, 1.22fr);
  align-items: center;
  gap: clamp(3rem, 7vw, 8rem);
}

.hero-copy {
  align-self: center;
  max-width: 34rem;
  padding-top: clamp(1rem, 6vh, 6rem);
}

.wordmark {
  margin: 0;
  font-family: "IBM Plex Sans", Arial, Helvetica, sans-serif;
  font-weight: 400;
  font-size: clamp(3.6rem, 6.7vw, 7.8rem);
  line-height: 0.92;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.wordmark span {
  display: block;
}

.divider-mark {
  margin: 2rem 0 1.65rem;
  color: var(--graphite);
}

.statement {
  margin: 0;
  max-width: 30rem;
  font-size: clamp(1rem, 1.3vw, 1.28rem);
  line-height: 1.72;
}

.primary-links {
  display: grid;
  gap: 1rem;
  margin-top: clamp(2.5rem, 5vw, 4.5rem);
}

.primary-link {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  color: var(--accent);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.95rem;
}

.primary-link::after {
  content: "→";
  transition: transform 160ms ease;
}

.primary-link:hover::after,
.primary-link:focus-visible::after {
  transform: translateX(0.28rem);
}

.primary-link:focus-visible,
.back-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 0.4rem;
}

.diagram-wrap {
  width: 100%;
  align-self: center;
}

.diagram-wrap svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.diagram-caption {
  width: fit-content;
  margin: 1.4rem auto 0;
  color: var(--graphite);
  font-size: 0.73rem;
  line-height: 1.55;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--graphite);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.subpage-shell {
  width: min(100%, 960px);
  min-height: 100vh;
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 4rem);
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 3rem;
}

.subpage-main {
  align-self: center;
  max-width: 42rem;
}

.eyebrow {
  margin: 0 0 1.5rem;
  color: var(--graphite);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.subpage-title {
  margin: 0;
  font-family: "IBM Plex Sans", Arial, Helvetica, sans-serif;
  font-weight: 400;
  font-size: clamp(3.2rem, 8vw, 6.8rem);
  line-height: 0.98;
  letter-spacing: 0.04em;
}

.subpage-copy {
  margin: 2rem 0 0;
  max-width: 34rem;
  font-size: 1.05rem;
  line-height: 1.75;
}

.back-link {
  display: inline-flex;
  gap: 0.75rem;
  width: fit-content;
  color: var(--accent);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.86rem;
}

@media (max-width: 900px) {
  .site-shell {
    min-height: auto;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 3.5rem;
  }

  .hero-copy {
    padding-top: 1rem;
  }

  .diagram-wrap {
    max-width: 760px;
    margin: 0 auto;
  }
}

@media (max-width: 600px) {
  .site-meta,
  .site-footer {
    display: grid;
  }

  .site-meta__right {
    text-align: left;
  }

  .wordmark {
    font-size: clamp(3rem, 17vw, 5.2rem);
    letter-spacing: 0.05em;
  }

  .statement {
    font-size: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}