/* Downhill page — visual identity per OTH/70-cover/SYSTEM_README.md.
   Field is always a gradient, never flat. Bone for text, brick-red only
   for the line, gold only for weight/accent. No mountain/snow imagery,
   no hype copy. Type: Caladea display, Lora body, Lato labels. */

:root {
  --field-top: #0B1019;
  --field-bot: #050608;
  --bone: #F1E9D8;
  --bone-dim: rgba(241, 233, 216, 0.72);
  --brick: #A23A2D;
  --gold: #C6A14C;
  --line: rgba(241, 233, 216, 0.18);
  --display: 'Caladea', Georgia, serif;
  --body: 'Lora', Georgia, serif;
  --label: 'Lato', 'Segoe UI', system-ui, sans-serif;
}

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

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

body {
  background: linear-gradient(180deg, var(--field-top) 0%, var(--field-bot) 100%);
  background-attachment: fixed;
  color: var(--bone);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.66;
  min-height: 100vh;
}

.wrap { max-width: 42rem; margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }

a { color: var(--bone); }

.crumb {
  font-family: var(--label);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bone-dim);
  margin-bottom: 2.25rem;
}
.crumb a { color: var(--bone-dim); text-decoration: none; }
.crumb a:hover { color: var(--gold); }

.book-head { display: grid; gap: 1.75rem; align-items: start; }
@media (min-width: 40rem) { .book-head { grid-template-columns: 220px 1fr; } }

.book-head .cover img {
  display: block; width: 100%; max-width: 260px; height: auto;
  border: 1px solid var(--line);
}

.book-head h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 2.4rem;
  line-height: 1.05;
  letter-spacing: 0.01em;
}

.book-head .author {
  margin-top: 0.6rem;
  font-family: var(--label);
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bone-dim);
}

.book-head .subtitle {
  margin-top: 1.1rem;
  font-style: italic;
  font-size: 1.125rem;
  color: var(--bone-dim);
}

.thesis {
  margin-top: 1.5rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1.3;
}
.thesis::after {
  content: '';
  display: block;
  width: 5.5rem;
  height: 2px;
  background: var(--gold);
  margin-top: 0.7rem;
}

.label {
  font-family: var(--label);
  font-weight: 700;
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.rule { border: 0; border-top: 1px solid var(--line); margin: 2.25rem 0; }

.prose p { margin-bottom: 1.05rem; color: var(--bone-dim); }
.prose p:first-child { color: var(--bone); }
.prose p:last-child { margin-bottom: 0; }

.avail { margin-top: 1.6rem; }
.avail .date {
  font-family: var(--label);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.buy { margin-top: 0.9rem; display: flex; flex-wrap: wrap; gap: 0.6rem; }
.buy span, .buy a {
  font-family: var(--label);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  padding: 0.55rem 0.9rem;
  color: var(--bone-dim);
  text-decoration: none;
}
.buy a { color: var(--bone); border-color: var(--gold); }
.buy a:hover { color: var(--gold); }

.site-note {
  margin-top: 1.4rem;
  font-family: var(--label);
  font-size: 0.8125rem;
  color: var(--bone-dim);
}
.site-note a { color: var(--bone); }

.colophon {
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  padding-top: 1.4rem;
  font-family: var(--label);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--bone-dim);
  line-height: 1.7;
}
.colophon a { color: var(--bone-dim); }