.chapter-nav {
  padding: 30px;
  border: 1px solid #eeeeee;
  height: 100%;
  box-sizing: border-box;
  transition: border-color 0.2s ease;
}

/* red border on hover — clickable boxes only */
.chapter-nav-prev:not(.chapter-nav-disabled):not(.chapter-nav-locked):hover,
.chapter-nav-next:not(.chapter-nav-disabled):not(.chapter-nav-locked):hover {
  border-color: #a91101;
}

/* labels — Lato */
.chapter-nav .chapter-nav-label {
  font-family: 'Lato', sans-serif !important;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.chapter-nav-prev .chapter-nav-label { color: #d4a0a0; }
.chapter-nav-next .chapter-nav-label { color: #c0392b; }
.chapter-nav-next { text-align: right; }

/* chapter number — Playfair Display italic */
.chapter-nav .chapter-nav-number {
  font-family: 'Playfair Display', Georgia, serif !important;
  font-style: italic;
  font-size: 18px;
  color: #555555;
  margin-bottom: 8px;
}

/* divider — only shown when there's no chapter number */
.chapter-nav-divider {
  width: 30px;
  border-top: 2px solid #dddddd;
  margin: 0 0 16px 0;
}
.chapter-nav-next .chapter-nav-divider { margin-left: auto; }

/* titles — Playfair Display */
.chapter-nav .chapter-nav-title a,
.chapter-nav .chapter-nav-title span {
  font-family: 'Playfair Display', Georgia, serif !important;
  font-size: 28px;
  line-height: 1.2;
  text-decoration: none;
  display: inline-block;
}
.chapter-nav-prev .chapter-nav-title a,
.chapter-nav-prev .chapter-nav-title span { color: #bbbbbb; font-weight: 400; }
.chapter-nav-next .chapter-nav-title a,
.chapter-nav-next .chapter-nav-title span { color: #111111; font-weight: 700; }

/* locked / coming soon — Lato */
.chapter-nav-locked { cursor: not-allowed; }
.chapter-nav-locked .chapter-nav-title span { opacity: 0.55; }
.chapter-nav .chapter-nav-soon {
  font-family: 'Lato', sans-serif !important;
  margin-top: 12px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #a91101;
}
.chapter-nav-next .chapter-nav-soon { text-align: right; }