/* External Gravity Cosmology: single small stylesheet */
:root {
  --bg: #070b14;
  --bg-soft: #0e1524;
  --line: #1f2a40;
  --text: #e8ecf4;
  --muted: #a3aec3;
  --accent: #8ab4f8;
  --warm: #f0a15e;
  --max: 42rem;
  --wide: 52rem;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
}

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

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

body {
  margin: 0;
  background: radial-gradient(ellipse 90% 50% at 50% -10%, #14203a 0%, transparent 60%), var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.125rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img { display: block; max-width: 100%; height: auto; }

a { color: var(--accent); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { color: #cfe0ff; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.wrap { width: 100%; max-width: var(--wide); margin: 0 auto; padding: 0 1.25rem; }
.narrow { max-width: var(--max); }

/* Header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding-top: 0.9rem; padding-bottom: 0.9rem;
}
.brand {
  display: flex; align-items: center; gap: 0.6rem;
  color: var(--text); text-decoration: none;
  font-family: var(--serif); font-weight: 600; font-size: 1.05rem; line-height: 1.2;
}
.brand img { width: 28px; height: 28px; }
.nav { display: flex; gap: 1.25rem; font-size: 0.95rem; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--text); }

main { flex: 1; }

/* Home: first screen */
.hero { text-align: center; padding-top: 2.5rem; padding-bottom: 3rem; }
.hero h1 {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(2.1rem, 6vw, 3.1rem); line-height: 1.12;
  letter-spacing: -0.015em; margin: 0 0 0.6rem;
}
.tagline {
  font-size: clamp(1.15rem, 2.6vw, 1.4rem); color: var(--muted);
  margin: 0 auto 2rem; max-width: 30rem; line-height: 1.45; text-wrap: balance;
}
.hero figure { margin: 0 auto; max-width: 44rem; }
.hero img { width: 100%; border-radius: 14px; box-shadow: 0 18px 50px rgba(0,0,0,0.5); }
.hero figcaption {
  font-family: var(--serif); font-style: italic;
  color: var(--muted); font-size: 1.05rem; line-height: 1.5;
  margin: 1rem auto 0; max-width: 36rem; text-wrap: balance;
}

/* Home: blocks */
.blocks { display: grid; gap: 2.5rem; padding-top: 1rem; padding-bottom: 3rem; }
.block h2, .page-head h1 {
  font-family: var(--serif); font-weight: 600; letter-spacing: -0.01em;
}
.block h2 { font-size: 1.45rem; line-height: 1.3; margin: 0 0 0.5rem; color: #fff; }
.block p { margin: 0; }
.blocks.single { max-width: 46rem; margin: 0 auto; padding-top: 0; padding-bottom: 4rem; }
.cta:has(+ .blocks.single) { padding-bottom: 2.5rem; }

.data-figure { margin: 0 auto; padding-top: 1rem; padding-bottom: 2.5rem; max-width: 46rem; }
.map-card { background: #fff; border-radius: 12px; padding: clamp(0.6rem, 2.5vw, 1.25rem); }
.map-crop { overflow: hidden; aspect-ratio: 1299 / 647; }
.map-crop img { width: 100%; margin-top: -3.156%; } /* hides the chart title and colour scale; the map itself is untouched */
.data-figure figcaption {
  color: var(--muted); font-size: 0.98rem; line-height: 1.55;
  margin: 0.8rem auto 0; max-width: var(--max); text-align: center;
}

.cta { text-align: center; padding: 0.5rem 0 4rem; margin: 0; }
.button {
  display: inline-block; padding: 0.75rem 1.5rem; border-radius: 999px;
  background: var(--accent); color: #0a1220; font-weight: 600;
  text-decoration: none; font-size: 1.05rem;
}
.button:hover { background: #b3cdfb; color: #0a1220; }

/* Papers page */
.page-head { padding: 3rem 0 1rem; }
.page-head h1 { font-size: clamp(2rem, 5vw, 2.6rem); line-height: 1.15; margin: 0 0 0.75rem; }
.page-head p { color: var(--muted); margin: 0 0 0.4rem; }
.papers { list-style: none; margin: 0; padding: 1rem 0 4rem; display: grid; gap: 1.25rem; }
.paper {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 14px;
  padding: 1.4rem 1.5rem;
}
.paper h2 { font-family: var(--serif); font-size: 1.3rem; line-height: 1.3; font-weight: 600; margin: 0 0 0.5rem; }
.paper p { margin: 0 0 0.9rem; }
.paper .label {
  display: inline-block; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--warm); margin: 0 0 0.4rem;
}
.links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; align-items: center; margin: 0 0 0.9rem; font-size: 1rem; }
.links .button { padding: 0.55rem 1.2rem; font-size: 0.98rem; }
.cite {
  font-size: 0.88rem; line-height: 1.55; color: var(--muted);
  border-top: 1px solid var(--line); padding-top: 0.8rem; margin: 0;
  overflow-wrap: anywhere;
}

/* Footer */
.site-footer { border-top: 1px solid var(--line); font-size: 0.95rem; }
.site-footer .wrap {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem 2rem;
  padding-top: 1.5rem; padding-bottom: 1.75rem;
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); }

@media (min-width: 760px) {
  body { font-size: 1.15rem; }
  .hero { padding-top: 2.25rem; }
  .blocks.two { grid-template-columns: repeat(2, 1fr); gap: 2.25rem; }
  .block p { font-size: 1.02rem; }
}

@media (max-width: 420px) {
  .brand img { display: none; }
  .brand span { font-size: 1rem; }
  .nav { gap: 1rem; }
  .paper { padding: 1.2rem 1.15rem; }
}