* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  color: #2d1912;
  background: #6f1212;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}
.book-shell {
  min-height: 100vh;
  padding: 18px 14px 34px;
  background:
    linear-gradient(rgba(111, 18, 18, 0.90), rgba(78, 8, 9, 0.96)),
    radial-gradient(circle at 50% 0%, rgba(224, 185, 88, 0.26), transparent 42%);
}
.book-header {
  max-width: 860px;
  margin: 0 auto 18px;
  color: #f9e6ad;
}
.home-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 15px;
  border: 1px solid rgba(232, 196, 105, 0.58);
  border-radius: 999px;
  color: #f9e6ad;
  background: rgba(54, 8, 8, 0.3);
  text-decoration: none;
  font-size: 16px;
}
h1 {
  margin: 22px 0 8px;
  font-size: clamp(30px, 8vw, 48px);
  line-height: 1.15;
  letter-spacing: 0;
  color: #ffd779;
}
.subtitle {
  margin: 0;
  color: rgba(255, 242, 207, 0.82);
  font-size: 15px;
}
.book-page {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(22px, 6vw, 48px);
  border: 1px solid rgba(186, 126, 34, 0.38);
  border-radius: 8px;
  background: #fff4dd;
  box-shadow: 0 18px 42px rgba(33, 4, 4, 0.28);
}
.book-page p {
  margin: 0 0 1.15em;
  font-size: clamp(20px, 5.2vw, 28px);
  line-height: 1.78;
  letter-spacing: 0;
  word-break: break-word;
}
.book-page p.tibetan,
.book-page p.mixed {
  font-family: "Microsoft Himalaya", "Kailasa", "Noto Serif Tibetan", "Qomolangma-Uchen Sarchen", serif;
  font-size: clamp(25px, 7vw, 36px);
  line-height: 1.62;
}
.empty-note {
  color: #7d5b39;
  border-left: 4px solid #bd8d2f;
  padding-left: 14px;
}
@media (min-width: 900px) {
  .book-shell { padding-top: 32px; }
}