/* The Billiard Ball Universe — launch page.
   Book-adjacent typography: Palatino, one narrow measure, no apparatus. */

:root {
  --paper: #faf8f4;
  --ink: #1c1a17;
  --faint: #6b665e;
  --rule: #d8d3ca;
  --link: #365a8c;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #161513;
    --ink: #e6e1d8;
    --faint: #948e83;
    --rule: #35322c;
    --link: #8fb0dd;
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { font-size: 17px; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: Palatino, "Palatino Linotype", "URW Palladio L", Georgia, serif;
  line-height: 1.6;
}

main {
  max-width: 34rem;
  margin: 0 auto;
  padding: 4.5rem 1.25rem 3rem;
}

header { text-align: center; margin-bottom: 3rem; }

h1 {
  font-size: 2rem;
  font-weight: normal;
  letter-spacing: 0.01em;
  margin-bottom: 0.4rem;
}

.subtitle {
  font-style: italic;
  font-size: 1.15rem;
  color: var(--faint);
  margin-bottom: 1.6rem;
}

.author { font-variant: small-caps; letter-spacing: 0.08em; }

.mark {
  color: var(--faint);
  font-size: 1.1rem;
  margin-bottom: 1.6rem;
}

section { margin-bottom: 2.4rem; }

h2 {
  font-size: 1.05rem;
  font-weight: normal;
  font-variant: small-caps;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.3rem;
  margin-bottom: 0.9rem;
}

p + p { margin-top: 0.9rem; }

a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }

footer {
  margin-top: 3.5rem;
  text-align: center;
  color: var(--faint);
}

footer .mark { margin-bottom: 1.2rem; }

footer p + p { margin-top: 0.5rem; }

.fine { font-size: 0.85rem; }