.book-summary-card {
  margin: 34px 0;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(135deg, #edf6f1, #fbfaf5);
}

.book-summary-card h2 {
  margin: 0 0 8px;
}

.book-subtitle {
  margin: 0 0 22px;
  color: #61736a;
}

.book-summary-card dl {
  display: flex;
  gap: 28px;
  margin: 0;
  flex-wrap: wrap;
}

.book-summary-card dl > div {
  display: flex;
  gap: 8px;
}

.book-summary-card dt {
  color: #748179;
  font-size: 13px;
}

.book-summary-card dd {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
}

.reader-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 26px 0;
}

.reader-grid > div {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fcfdfc;
}

.reader-grid strong {
  color: var(--dark);
}

.reader-grid p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
}

.book-purchase-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin-top: 24px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: #f7faf8;
}

.book-purchase-box h3 {
  margin: 0 0 8px;
}

.book-purchase-box p:last-child {
  margin-bottom: 0;
  color: #68776f;
  font-size: 13px;
}

.book-link-button {
  flex: 0 0 auto;
}

.affiliate-disclosure {
  margin-top: 12px;
  color: #748179;
  font-size: 12px;
  line-height: 1.8;
}

@media (max-width: 680px) {
  .reader-grid {
    grid-template-columns: 1fr;
  }

  .book-purchase-box {
    align-items: stretch;
    flex-direction: column;
  }

  .book-link-button {
    width: 100%;
  }
}