/* ═══════════════════════════════════════════════════════════
   VERBATIM — Reading Room  ·  Minimalist Modern
═══════════════════════════════════════════════════════════ */

/* ── Filter bar ── */
.rr-filter-bar {
  display: flex; gap: var(--space-2); flex-wrap: wrap;
  margin-bottom: var(--space-6);
}
.rr-filter-btn {
  padding: 7px 16px; border-radius: var(--radius-full);
  font-size: 13px; font-weight: 500; font-family: var(--font-body);
  border: 1px solid var(--border); background: var(--white);
  color: var(--text-secondary); cursor: pointer; transition: all 0.15s;
}
.rr-filter-btn:hover { border-color: var(--gold-border); color: var(--gold); }
.rr-filter-btn.active {
  background: var(--gold); border-color: transparent;
  color: #FFFFFF; font-weight: 600;
}

/* ── Books grid ── */
.rr-grid {
  display: grid; gap: var(--space-5);
  grid-template-columns: 1fr;
}
@media (min-width: 640px)  { .rr-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .rr-grid { grid-template-columns: repeat(3, 1fr); } }

/* ── Book card ── */
.book-card {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-xl); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: all 0.25s;
  cursor: pointer; position: relative;
  display: flex; flex-direction: column;
}
.book-card:hover {
  border-color: var(--gold-border);
  box-shadow: var(--shadow-accent);
  transform: translateY(-3px);
}

.book-card-spine {
  height: 6px;
  background: var(--gradient-accent);
}
.book-card[data-category="habits"] .book-card-spine    { background: linear-gradient(90deg, #16A34A, #4ade80); }
.book-card[data-category="stories"] .book-card-spine   { background: linear-gradient(90deg, #7C3AED, #A78BFA); }
.book-card[data-category="philosophy"] .book-card-spine { background: linear-gradient(90deg, #0052FF, #4D7CFF); }
.book-card[data-category="leadership"] .book-card-spine { background: var(--gradient-accent); }
.book-card[data-category="stoic"] .book-card-spine      { background: linear-gradient(90deg, #0F172A, #475569); }

.book-card-body { padding: var(--space-5); flex: 1; display: flex; flex-direction: column; }
.book-category-tag {
  font-size: 10px; font-family: var(--font-mono); text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--text-muted); margin-bottom: var(--space-3);
}
.book-title {
  font-family: var(--font-display); font-size: 17px; font-weight: 400;
  color: var(--text-primary); line-height: 1.35; margin-bottom: var(--space-1);
}
.book-author { font-size: 13px; color: var(--text-muted); margin-bottom: var(--space-3); }
.book-insight {
  font-size: 13px; color: var(--text-secondary); line-height: 1.6;
  flex: 1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-card-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-3) var(--space-5); border-top: 1px solid var(--border);
  background: var(--surface-raised);
}
.book-read-time { font-size: 11px; font-family: var(--font-mono); color: var(--text-muted); }
.book-save-btn {
  background: none; border: none; cursor: pointer; font-size: 18px;
  color: var(--text-muted); transition: all 0.2s; padding: 4px; border-radius: var(--radius-sm);
  line-height: 1;
}
.book-save-btn:hover { color: var(--gold); transform: scale(1.15); }
.book-save-btn.saved { color: var(--gold); }

/* ── Book detail panel (slide-in) ── */
.book-detail-overlay {
  position: fixed; inset: 0; background: rgba(15,23,42,0.4);
  z-index: 800; opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.book-detail-overlay.open { opacity: 1; pointer-events: auto; }

.book-detail-panel {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: min(560px, 100vw);
  background: var(--white); box-shadow: -8px 0 48px rgba(15,23,42,0.12);
  overflow-y: auto; z-index: 801;
  transform: translateX(100%); transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
  display: flex; flex-direction: column;
}
.book-detail-panel.open { transform: translateX(0); }

.bdp-spine { height: 8px; background: var(--gradient-accent); flex-shrink: 0; }
.bdp-header {
  padding: var(--space-6) var(--space-6) var(--space-4);
  display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-4);
  border-bottom: 1px solid var(--border);
}
.bdp-close {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--surface-raised);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 18px; color: var(--text-muted); flex-shrink: 0;
  transition: all 0.2s;
}
.bdp-close:hover { border-color: var(--gold-border); color: var(--gold); }

.bdp-body { padding: var(--space-6); flex: 1; }
.bdp-category { font-size: 11px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); margin-bottom: var(--space-2); }
.bdp-title { font-family: var(--font-display); font-size: 26px; color: var(--text-primary); margin-bottom: var(--space-1); }
.bdp-author { font-size: 15px; color: var(--text-muted); margin-bottom: var(--space-6); }

.bdp-section-label {
  font-size: 11px; font-family: var(--font-mono); text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--gold); margin-bottom: var(--space-3);
  display: flex; align-items: center; gap: var(--space-2);
}
.bdp-section-label::before {
  content: ''; width: 16px; height: 1.5px; background: var(--gold);
}

.bdp-core-insight {
  background: var(--gold-dim);
  border: 1px solid var(--gold-border); border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5); margin-bottom: var(--space-6);
  font-size: 15px; color: var(--text-primary); line-height: 1.65;
}

.bdp-takeaways { margin-bottom: var(--space-6); }
.bdp-takeaway-item {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding: var(--space-3) 0; border-bottom: 1px solid var(--border);
  font-size: 14px; color: var(--text-primary); line-height: 1.55;
}
.bdp-takeaway-item:last-child { border-bottom: none; }
.bdp-takeaway-num {
  font-family: var(--font-mono); font-size: 12px; color: var(--gold);
  font-weight: 600; flex-shrink: 0; margin-top: 1px;
}

.bdp-quote {
  background: var(--surface-raised); border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: var(--space-5); color: var(--text-primary);
  font-family: var(--font-display); font-size: 15px; line-height: 1.6;
  font-style: italic; margin-bottom: var(--space-6); position: relative;
}
.bdp-quote::before {
  content: '"'; position: absolute; top: 8px; left: 16px;
  font-size: 56px; line-height: 1; opacity: 0.15;
  font-family: var(--font-display); color: var(--gold);
}
.bdp-quote-text { padding-left: var(--space-2); }
.bdp-quote-attr { font-size: 12px; color: var(--text-muted); margin-top: var(--space-3); font-family: var(--font-mono); font-style: normal; }

.bdp-footer {
  padding: var(--space-5) var(--space-6);
  border-top: 1px solid var(--border);
  display: flex; gap: var(--space-3); align-items: center; flex-wrap: wrap;
}