:root {
  --bg: #fdf7ee;
  --panel: #fffaf3;
  --accent: #b88a4d;
  --accent-dark: #7c5a2c;
  --text: #4a3b2b;
  --line: #e9d8bd;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background: linear-gradient(135deg, #fffaf3 0%, #f8ebd8 100%);
  color: var(--text);
  min-height: 100vh;
}

.site-header,
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  background: rgba(255, 250, 243, 0.95);
  box-shadow: 0 2px 12px rgba(120, 86, 34, 0.08);
}

.brand {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-dark);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.top-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nav-btn,
.action-btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 999px;
  text-decoration: none;
  color: #fff;
  background: var(--accent);
  transition: transform 0.2s ease, background 0.2s ease;
}

.nav-btn:hover,
.action-btn:hover {
  transform: translateY(-2px);
  background: var(--accent-dark);
}

main {
  padding: 32px 20px 48px;
}

.hero {
  max-width: 960px;
  margin: 24px auto 34px;
  text-align: center;
  padding: 38px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 10px 30px rgba(120, 86, 34, 0.12);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--accent);
  font-size: 0.9rem;
}

.hero h1 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  margin: 10px 0 12px;
}

.hero-copy {
  max-width: 720px;
  margin: 0 auto 24px;
  font-size: 1.05rem;
  line-height: 1.7;
}

.center-buttons {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  max-width: 760px;
  margin: 0 auto;
}

.action-btn {
  text-align: center;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}

.chapter-nav {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  margin-top: 20px;
}

.chapter-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 8px;
  border-radius: 999px;
  background: #f3e3c6;
  color: var(--accent-dark);
  text-decoration: none;
  font-size: 0.95rem;
  border: 1px solid var(--line);
}

.chapter-btn:hover {
  background: var(--accent);
  color: #fff;
}

.info-card,
.content-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 6px 18px rgba(120, 86, 34, 0.08);
}

.page-shell {
  max-width: 900px;
  margin: 24px auto 40px;
}

.content-card h1 {
  margin-top: 0;
  color: var(--accent-dark);
}

.content-card p,
.content-card li {
  line-height: 1.8;
}

@media (max-width: 768px) {
  .site-header,
  .site-footer {
    flex-direction: column;
    gap: 12px;
  }

  .center-buttons,
  .info-grid,
  .chapter-nav {
    grid-template-columns: 1fr;
  }
}