/* ── Chapter styles ── */
.chapter {
  padding: 72px 0;
  border-bottom: 1px solid var(--border);
}
.chapter:nth-child(even) { background: #F6F8FB; }
.chapter-label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 10px;
}
.chapter h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-bottom: 20px; }
.chapter p { font-size: 16px; line-height: 1.8; color: #374151; margin-bottom: 18px; max-width: 740px; }
.chapter p:last-child { margin-bottom: 0; }

.chapter-key-point {
  background: #fff;
  border-radius: 12px;
  border-left: 4px solid var(--primary);
  padding: 20px 24px;
  margin: 28px 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: #1e3a5f;
  box-shadow: 0 2px 12px rgba(21,101,192,.07);
  max-width: 700px;
}
.chapter-key-point strong { color: var(--primary); }

.chapter-stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin: 32px 0;
}
.chapter-stat {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  box-shadow: 0 2px 16px rgba(21,101,192,.08);
}
.chapter-stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}
.chapter-stat-label { font-size: 14px; color: #4B5563; line-height: 1.4; }
.chapter-stat-source { font-size: 11px; color: #6b7280; margin-top: 6px; }

.chapter-list {
  list-style: none;
  max-width: 700px;
}
.chapter-list li {
  padding: 10px 0 10px 28px;
  font-size: 15.5px;
  line-height: 1.6;
  color: #374151;
  border-bottom: 1px solid #f3f4f6;
  position: relative;
}
.chapter-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}
.chapter-list li:last-child { border-bottom: none; }

.chapter-example {
  background: #f0f4ff;
  border-radius: 12px;
  border-left: 4px solid var(--primary);
  padding: 24px 28px;
  margin: 28px 0;
  max-width: 700px;
}
.chapter-example-label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 10px;
}
.chapter-example p { font-size: 15px; color: #374151; margin-bottom: 0; }

/* ── Disclaimer banner ── */
.guide-disclaimer {
  background: #f8f9fb;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 16px 20px;
  font-size: 13px;
  line-height: 1.6;
  color: #6b7280;
  max-width: 740px;
  margin: 0 0 40px;
}
.guide-disclaimer strong { color: #374151; }

/* ── Chapter nav ── */
.ebook-nav {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.ebook-nav-inner {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.ebook-nav-inner::-webkit-scrollbar { display: none; }
.ebook-nav a {
  flex-shrink: 0;
  padding: 14px 20px;
  font-size: 13px;
  font-weight: 600;
  color: #6B7280;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
  text-decoration: none;
  transition: color .15s, border-color .15s;
}
.ebook-nav a:hover { color: var(--primary); border-bottom-color: var(--primary); }

/* ── Final CTA ── */
.ebook-cta {
  background: linear-gradient(135deg, #0D47A1, #1565C0);
  color: #fff;
  padding: 80px 0;
  text-align: center;
}
.ebook-cta h2 { color: #fff; margin-bottom: 16px; font-size: clamp(1.6rem, 3vw, 2.2rem); }
.ebook-cta h2::after { display: none; }
.ebook-cta p { font-size: 18px; opacity: .88; max-width: 560px; margin: 0 auto 32px; }
.ebook-cta .btn { background: #fff; color: #1565C0; }
.ebook-cta .btn:hover { background: #f0f4ff; }
.ebook-cta-fine {
  margin-top: 24px;
  font-size: 13px;
  opacity: .65;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}