.library-page {
  max-width: 58rem;
  margin: 0 auto;
}

.library-header {
  padding: 1rem 0 2.4rem;
}

.library-kicker,
.library-section-kicker {
  margin: 0 0 0.45rem;
  color: var(--primary);
  font-family: var(--font-secondary), sans-serif;
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.library-header h1 {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
}

.library-intro {
  max-width: 44rem;
  margin: 0.8rem 0 0;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.55;
}

.library-section {
  margin-top: 2.8rem;
  padding-top: 2.2rem;
  border-top: 2px solid var(--tertiary);
}

.library-section h2 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
}

.library-section-intro {
  max-width: 46rem;
  margin: 0.7rem 0 0;
  line-height: 1.6;
}

.library-book-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem 1rem;
  margin-top: 1.4rem;
}

.library-book-card {
  min-width: 0;
}

.library-book-cover-link {
  display: block;
  text-decoration: none;
}

.library-book-cover {
  display: block;
  width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border: 1px solid var(--tertiary);
  background: rgba(127, 127, 127, 0.08);
}

.library-book-cover-placeholder {
  min-height: 10rem;
}

.library-book-copy {
  padding-top: 0.6rem;
}

.library-book-copy h3 {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.25;
}

.library-book-copy h3 a {
  text-decoration: none;
}

.library-book-copy p {
  margin: 0.25rem 0 0;
  opacity: 0.72;
  font-size: 0.82rem;
  line-height: 1.35;
}

.library-shelf-links {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.library-shelf-link {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--tertiary);
  font-weight: 700;
  text-decoration: none;
}

.library-shelf-link span:last-child {
  opacity: 0.65;
  font-weight: 400;
  white-space: nowrap;
}

.library-shelf-detail {
  margin-top: 1rem;
  border-top: 1px solid var(--tertiary);
}

.library-shelf-detail summary {
  cursor: pointer;
  padding: 1rem 0;
  font-size: 1.05rem;
  font-weight: 800;
}

.library-shelf-detail[open] summary {
  margin-bottom: 0.2rem;
}

.library-all-finished {
  margin-top: 1.4rem;
}

.library-all-finished summary {
  cursor: pointer;
  font-weight: 800;
}

.library-empty {
  margin-top: 1rem;
  padding-left: 1rem;
  border-left: 3px solid var(--primary);
}

@media (max-width: 760px) {
  .library-book-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .library-shelf-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .library-book-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .library-shelf-links {
    grid-template-columns: 1fr;
  }
}