/* Books page — jcs3.com
   ----------------------
   Self-contained. Drop this on the page alongside books.html and books.js.
   If your site has a global stylesheet, this only adds the .bt-* classes.
*/

:root {
  --bt-bg: #fafaf7;
  --bt-surface: #ffffff;
  --bt-surface-2: #f1efe8;
  --bt-text: #1a1a1a;
  --bt-text-2: #5f5e5a;
  --bt-text-3: #888780;
  --bt-border: rgba(0, 0, 0, 0.10);
  --bt-border-2: rgba(0, 0, 0, 0.18);
  --bt-accent: #185fa5;
  --bt-reading-bg: #E6F1FB; --bt-reading-fg: #0C447C;
  --bt-read-bg:    #E1F5EE; --bt-read-fg:    #085041;
  --bt-tbr-bg:     #F1EFE8; --bt-tbr-fg:     #444441;
  --bt-dnf-bg:     #FCEBEB; --bt-dnf-fg:     #791F1F;
  --bt-radius: 8px;
  --bt-radius-lg: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bt-bg: #141413;
    --bt-surface: #1c1c1b;
    --bt-surface-2: #26262521;
    --bt-text: #f5f4ee;
    --bt-text-2: #b4b2a9;
    --bt-text-3: #888780;
    --bt-border: rgba(255, 255, 255, 0.10);
    --bt-border-2: rgba(255, 255, 255, 0.18);
    --bt-accent: #85B7EB;
  }
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bt-bg);
  color: var(--bt-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding: 2rem 1.25rem 4rem;
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.bt-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
.bt-header h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.bt-sub {
  margin: 4px 0 0;
  color: var(--bt-text-2);
  font-size: 14px;
}
.bt-back {
  color: var(--bt-text-2);
  text-decoration: none;
  font-size: 13px;
}
.bt-back:hover { color: var(--bt-text); }

/* Stats */
.bt-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 2rem;
}
@media (max-width: 540px) {
  .bt-stats { grid-template-columns: repeat(2, 1fr); }
}
.bt-stat {
  background: var(--bt-surface-2);
  border-radius: var(--bt-radius);
  padding: 0.85rem 1rem;
}
.bt-stat-label {
  font-size: 11px;
  color: var(--bt-text-2);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.bt-stat-val {
  font-size: 24px;
  font-weight: 500;
  margin-top: 2px;
}

/* Tabs */
.bt-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.bt-tab {
  font: inherit;
  font-size: 13px;
  padding: 6px 14px;
  border-radius: var(--bt-radius);
  border: 0.5px solid var(--bt-border);
  background: transparent;
  color: var(--bt-text);
  cursor: pointer;
  transition: background 0.12s, border 0.12s;
}
.bt-tab:hover { background: var(--bt-surface-2); }
.bt-tab.active {
  background: var(--bt-surface-2);
  border-color: var(--bt-border-2);
  font-weight: 500;
}

/* Controls */
.bt-controls {
  display: flex;
  gap: 8px;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.bt-controls input,
.bt-controls select {
  font: inherit;
  font-size: 14px;
  padding: 7px 12px;
  border-radius: var(--bt-radius);
  border: 0.5px solid var(--bt-border);
  background: var(--bt-surface);
  color: var(--bt-text);
}
.bt-controls input { flex: 1; min-width: 200px; }

/* Grid */
.bt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 18px;
}
.bt-card {
  background: var(--bt-surface);
  border: 0.5px solid var(--bt-border);
  border-radius: var(--bt-radius-lg);
  padding: 12px;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s, border-color 0.15s;
}
.bt-card:hover {
  border-color: var(--bt-border-2);
  transform: translateY(-2px);
}
.bt-cover {
  width: 100%;
  aspect-ratio: 2 / 3;
  background: var(--bt-surface-2);
  border-radius: var(--bt-radius);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--bt-text-3);
  overflow: hidden;
  text-align: center;
  padding: 4px;
  box-sizing: border-box;
}
.bt-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.bt-bk-title {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.3;
  margin: 0 0 2px;
}
.bt-bk-author {
  font-size: 12px;
  color: var(--bt-text-2);
  margin: 0 0 8px;
}
.bt-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  gap: 6px;
}
.bt-pill {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.bt-pill.reading { background: var(--bt-reading-bg); color: var(--bt-reading-fg); }
.bt-pill.read    { background: var(--bt-read-bg);    color: var(--bt-read-fg); }
.bt-pill.tbr     { background: var(--bt-tbr-bg);     color: var(--bt-tbr-fg); }
.bt-pill.dnf     { background: var(--bt-dnf-bg);     color: var(--bt-dnf-fg); }

.bt-rating {
  font-size: 12px;
  color: var(--bt-text-2);
  letter-spacing: 0.05em;
}

.bt-loading, .bt-empty, .bt-error {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--bt-text-2);
  padding: 2rem 1rem;
  font-size: 14px;
}
.bt-error { color: var(--bt-dnf-fg); }

.bt-footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 0.5px solid var(--bt-border);
  color: var(--bt-text-3);
  font-size: 12px;
  text-align: center;
}
.bt-footer a { color: var(--bt-text-2); }

/* Card click detail (optional modal-ish expansion using <details>) */
.bt-card-link {
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}