:root {
  color-scheme: light;
  --ink: #17272d;
  --muted: #53666e;
  --paper: #f7f8f5;
  --surface: #ffffff;
  --teal: #0f5262;
  --teal-dark: #0a3945;
  --aqua: #9dd7da;
  --gold: #e2b85d;
  --line: #d8e1df;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.65;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
}

a { color: #075e75; }
a:hover { color: #033e4e; }
a:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 10;
  padding: .65rem 1rem;
  background: var(--surface);
  color: var(--ink);
  border-radius: .35rem;
}
.skip-link:focus { top: 1rem; }

.hero {
  color: #fff;
  background: linear-gradient(140deg, var(--teal-dark), var(--teal) 65%, #4c8c96);
}

.hero-inner,
main,
footer {
  width: min(100% - 2rem, 1120px);
  margin-inline: auto;
}

.hero-inner { padding: clamp(3rem, 9vw, 7rem) 0 clamp(2.5rem, 7vw, 5rem); }

.eyebrow {
  margin: 0 0 .8rem;
  color: var(--aqua);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

h1, h2, h3 {
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.15;
}

h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(2.6rem, 7vw, 5.7rem);
  letter-spacing: -.035em;
}

.subtitle {
  margin: 1rem 0 .35rem;
  font-size: clamp(1.2rem, 2.8vw, 1.7rem);
}

.source { margin: 0; color: #d7ebee; }

.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.button {
  display: inline-block;
  padding: .7rem 1rem;
  border: 1px solid rgba(255,255,255,.7);
  border-radius: .35rem;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}
.button:hover { color: #fff; background: rgba(255,255,255,.12); }
.button.primary { color: var(--teal-dark); background: #fff; border-color: #fff; }
.button.primary:hover { color: var(--teal-dark); background: #eaf4f4; }

main { padding-block: clamp(2.5rem, 7vw, 5rem); }
main > section, main > nav { max-width: 920px; margin-inline: auto; }
h2 { margin: 0 0 1rem; font-size: clamp(1.8rem, 4vw, 2.55rem); }

.intro {
  padding: clamp(1.4rem, 4vw, 2.5rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: .6rem;
  box-shadow: 0 18px 45px rgba(17, 53, 61, .07);
}

.facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 2rem 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: .35rem;
  background: var(--line);
}
.facts div { padding: 1rem; text-align: center; background: #f8fbfa; }
.facts dt { color: var(--muted); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; }
.facts dd { margin: .2rem 0 0; color: var(--teal-dark); font-family: Georgia, serif; font-size: 1.75rem; font-weight: 700; }

.contents { margin-top: clamp(3rem, 8vw, 5rem); }
.part { margin-top: 2.25rem; }
.part h3 { margin: 0 0 .75rem; color: var(--teal-dark); font-size: 1.35rem; }
.part ol { margin: 0; padding: 0; list-style: none; counter-reset: unit; }
.part li + li { border-top: 1px solid var(--line); }
.part a {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem .25rem;
  color: var(--ink);
  text-decoration: none;
}
.part a:hover span { color: var(--teal); text-decoration: underline; text-underline-offset: .2em; }
.part small { flex: 0 0 auto; color: var(--muted); font-size: .75rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; }
.part.bridge { padding: 1.25rem 1.4rem; background: #eaf4f4; border-left: .35rem solid var(--teal); }

.provenance { margin-top: clamp(3rem, 8vw, 5rem); padding-top: 2rem; border-top: 1px solid var(--line); }
footer { padding: 1.25rem 0 2.5rem; color: var(--muted); font-size: .82rem; }

@media (max-width: 720px) {
  :root { font-size: 16px; }
  .hero-inner, main, footer { width: min(100% - 1.25rem, 1120px); }
  .facts { grid-template-columns: repeat(2, 1fr); }
  .button { width: 100%; text-align: center; }
  .part a { align-items: baseline; }
}

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