:root {
  color-scheme: light;
  --bg: #f7f1e8;
  --paper: #fffaf2;
  --ink: #241a14;
  --muted: #735f52;
  --line: #ead9c6;
  --accent: #8f4d2f;
  --accent-dark: #63311f;
  --shadow: rgba(64, 38, 24, .12);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background:
    radial-gradient(circle at top, rgba(143,77,47,.15), transparent 32rem),
    var(--bg);
  color: var(--ink);
  font-family: ui-serif, "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); }
.site {
  width: min(100%, 880px);
  margin: 0 auto;
  padding: 24px 18px 56px;
}
.hero {
  padding: clamp(36px, 8vw, 88px) 0 28px;
}
.kicker {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  font-family: ui-sans-serif, system-ui, sans-serif;
}
.hero h1 {
  margin: 12px 0 18px;
  font-size: clamp(2.4rem, 11vw, 5.8rem);
  line-height: .98;
  letter-spacing: -.06em;
}
.lede {
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(1.05rem, 3.8vw, 1.35rem);
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.primary, .secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 999px;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 700;
}
.primary { background: var(--accent); color: white; box-shadow: 0 10px 24px var(--shadow); }
.primary:hover { color: white; background: var(--accent-dark); }
.secondary { border: 1px solid var(--line); color: var(--accent); background: rgba(255,250,242,.7); }
.card {
  margin: 18px 0;
  padding: clamp(18px, 5vw, 30px);
  background: rgba(255,250,242,.82);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 18px 50px var(--shadow);
}
.card.compact { box-shadow: none; }
.card h2 {
  margin: 0 0 14px;
  font-size: 1.2rem;
}
.card p {
  color: var(--muted);
  line-height: 1.9;
}
.toc {
  display: grid;
  gap: 10px;
}
.chapter-link {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fffdf8;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 700;
}
.chapter-link span {
  color: var(--muted);
  font-weight: 500;
}
.chapter-link.active {
  border-color: rgba(143,77,47,.45);
  background: #fff4e8;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  background: linear-gradient(to bottom, var(--bg), rgba(247,241,232,.92));
  backdrop-filter: blur(8px);
  font-family: ui-sans-serif, system-ui, sans-serif;
}
.reader {
  margin-top: 18px;
  padding: clamp(22px, 6vw, 48px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: 0 18px 50px var(--shadow);
}
.reader h1 {
  margin: 0 0 32px;
  font-size: clamp(1.8rem, 7vw, 3rem);
  line-height: 1.25;
  letter-spacing: -.04em;
}
.reader p {
  margin: 0 0 1.15em;
  font-size: clamp(1.08rem, 4.4vw, 1.25rem);
  line-height: 2.05;
  text-align: justify;
}
.chapter-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: center;
  margin: 22px 0;
  font-family: ui-sans-serif, system-ui, sans-serif;
}
.chapter-nav a, .chapter-nav span {
  min-height: 44px;
  padding: 12px 14px;
  border-radius: 999px;
  text-align: center;
  border: 1px solid var(--line);
  background: rgba(255,250,242,.72);
}
.chapter-nav span { color: #a9998b; }
@media (max-width: 560px) {
  .site { padding: 18px 12px 44px; }
  .hero { padding-top: 28px; }
  .chapter-link { display: block; }
  .chapter-link span { display: block; margin-top: 4px; }
  .reader { border-radius: 20px; padding: 20px 16px; }
  .reader p { text-align: left; }
}