/* ============================================
   BOOKSHELF — Styles
   ============================================ */

.bookshelf {
  padding-top: calc(var(--nav-height) + var(--space-2xl));
  padding-bottom: var(--space-3xl);
  min-height: 100vh;
}

.bookshelf__header {
  margin-bottom: var(--space-2xl);
}

.bookshelf__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: var(--space-lg);
  transition: color var(--transition-fast);
}

.bookshelf__back:hover {
  color: var(--accent-gold);
}

.bookshelf__header h1 {
  margin-bottom: var(--space-sm);
}

.bookshelf__subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 60ch;
}

/* --- Filters --- */
.bookshelf__filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.bookshelf__filter {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.bookshelf__filter:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.bookshelf__filter.active {
  color: var(--accent-gold);
  border-color: var(--accent-gold);
  background: var(--accent-gold-dim);
}

/* --- Grid --- */
.bookshelf__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

/* --- Book card --- */
.book-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.book-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.book-card__status {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: var(--border-radius-sm);
}

.book-card__status--reading {
  background: rgba(201, 168, 76, 0.15);
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold-dim);
}

.book-card__status--completed {
  background: rgba(76, 201, 120, 0.12);
  color: var(--accent-green);
  border: 1px solid rgba(76, 201, 120, 0.25);
}

.book-card__status--planned {
  background: rgba(140, 150, 180, 0.1);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.book-card__category {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-gold);
}

.book-card__title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
}

.book-card__author {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-style: italic;
}

.book-card__review {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}

.book-card__review--empty {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-style: italic;
  opacity: 0.5;
}

.book-card__rating {
  font-size: 0.9rem;
  color: var(--accent-gold);
  letter-spacing: 0.15em;
}

/* --- Empty state --- */
.bookshelf__empty {
  text-align: center;
  padding: var(--space-3xl) 0;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.92rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .bookshelf__grid {
    grid-template-columns: 1fr;
  }
}