:root {
  --paper: #fbf8f3;
  --surface: #ffffff;
  --ink: #1f1b16;
  --ink-soft: #5c544a;
  --rule: #e6dfd4;
  --accent: #b5452b;
  --accent-ink: #ffffff;
  --note: #fff4d6;
  --note-ink: #5a4300;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --measure: 42rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17140f;
    --surface: #211d17;
    --ink: #f1ebe2;
    --ink-soft: #b3a99b;
    --rule: #3a342b;
    --accent: #e57a5e;
    --accent-ink: #17140f;
    --note: #3a3016;
    --note-ink: #f3dc9b;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1.0625rem/1.65 var(--sans);
}

a { color: var(--accent); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }

h1, h2, h3 { font-family: var(--sans); line-height: 1.2; font-weight: 600; }
h1 { font-size: clamp(2rem, 6vw, 3rem); margin: 0 0 1rem; }
h2 { font-size: 1.5rem; margin: 2.5rem 0 0.75rem; }
h3 { font-size: 1.15rem; margin: 1.5rem 0 0.5rem; }

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 16px; }
.wrap-wide { max-width: 60rem; margin: 0 auto; padding: 0 16px; }

/* Header and footer */
.site-header { border-bottom: 1px solid var(--rule); }
.site-header .wrap-wide {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 0.5rem 1.5rem; padding-top: 1rem; padding-bottom: 1rem;
}
.wordmark {
  font-family: var(--sans); font-size: 1.5rem; font-weight: 600;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.wordmark span { color: var(--accent); }
.site-nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; font-size: 0.95rem; }
.site-nav a { color: var(--ink-soft); text-decoration: none; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; }

.site-footer {
  border-top: 1px solid var(--rule); margin-top: 4rem; padding: 2rem 0 3rem;
  color: var(--ink-soft); font-size: 0.9rem;
}
.site-footer nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; margin-bottom: 0.75rem; }
.site-footer a { color: var(--ink-soft); }

main { padding-top: 2.5rem; }

/* Landing */
.hero { padding: 2rem 0 1rem; }
.hero .lede { font-size: 1.25rem; color: var(--ink-soft); max-width: 34rem; }
.stores { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 2rem 0 0.5rem; }
.store {
  display: inline-flex; flex-direction: column; padding: 0.6rem 1.1rem;
  border: 1px solid var(--rule); border-radius: 10px; background: var(--surface);
  min-width: 11rem;
}
.store small { color: var(--ink-soft); font-size: 0.8rem; }
.store strong { font-size: 1.05rem; }

.features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem; margin: 3rem 0 0;
}
.feature {
  background: var(--surface); border: 1px solid var(--rule); border-radius: 12px; padding: 1.25rem 1.25rem 0.5rem;
}
.feature h3 { margin-top: 0; }
.feature p { color: var(--ink-soft); }

/* Documents */
.doc .updated { color: var(--ink-soft); margin-top: -0.5rem; }
.doc table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.95rem; }
.doc th, .doc td { text-align: left; vertical-align: top; padding: 0.6rem 0.5rem; border-bottom: 1px solid var(--rule); }
.doc th { font-weight: 600; }
.table-scroll { overflow-x: auto; }

.notice {
  background: var(--note); color: var(--note-ink); border-radius: 10px;
  padding: 0.85rem 1rem; margin: 0 0 2rem; font-size: 0.95rem;
}

.button {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  padding: 0.7rem 1.2rem; border-radius: 10px; text-decoration: none; font-weight: 600;
}
.button:hover { filter: brightness(1.05); }

ol li, ul li { margin: 0.35rem 0; }

/* Shared book page (/book/<id>) */
.book { display: grid; grid-template-columns: 180px 1fr; gap: 0.5rem 1.5rem; align-items: start; }
.book-cover { width: 180px; height: auto; border-radius: 8px; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18); }
.book-heading h1 { margin-bottom: 0.25rem; }
.book-subtitle { font-size: 1.2rem; color: var(--ink-soft); margin: 0 0 0.5rem; }
.book-byline { font-size: 1.1rem; margin: 0 0 0.5rem; }
.book-meta { color: var(--ink-soft); margin: 0.25rem 0; }
.book-about { grid-column: 1 / -1; margin-top: 1rem; }
.book-about h2 { font-size: 1.15rem; margin: 1.5rem 0 0.5rem; }
.get-app { border-top: 1px solid var(--rule); margin-top: 2rem; padding-top: 0.5rem; }
@media (max-width: 34rem) {
  .book { grid-template-columns: 1fr; }
  .book-cover { width: 140px; }
}