:root {
  --primary: #3b1c62;
  --accent: #0097b2;
  --gold: #ffd000;
  --bg: #f7f7fb;
  --text: #202124;
  --muted: #667085;
  --card: #ffffff;
  --border: #e6e2ef;
}

body {
  background: var(--bg);
}

.catalog-page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
  color: var(--text);
}

/* Hero */

.catalog-hero {
  display: grid;
  grid-template-columns: 1.8fr 1fr;
  gap: 1.25rem;
  align-items: stretch;
  margin-bottom: 1rem;
}

.catalog-hero__content,
.commercial-card,
.catalog-note,
.catalog-toolbar,
.book-card {
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: 0 12px 30px rgba(59, 28, 98, 0.08);
}

.catalog-hero__content {
  border-radius: 24px;
  padding: 2rem;
  background:
    radial-gradient(circle at top right, rgba(0,151,178,0.14), transparent 30%),
    linear-gradient(135deg, #fff 0%, #f4f0fa 100%);
}

.eyebrow {
  color: var(--accent);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin: 0 0 .6rem;
}

.catalog-hero h1 {
  color: var(--primary);
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05;
  margin: 0;
}

.hero-copy {
  max-width: 760px;
  font-size: 1.05rem;
  line-height: 1.6;
  color: #3d3d45;
  margin: 1rem 0;
}

.language-switcher {
  display: flex;
  gap: .5rem;
  margin-bottom: 1rem;
}

.language-switcher a {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .4rem .8rem;
  text-decoration: none;
  color: var(--primary);
  background: #fff;
  font-weight: 800;
  font-size: .85rem;
}

.language-switcher a.active {
  background: var(--primary);
  color: #fff;
}

.catalog-badges {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1rem 0 1.25rem;
}

.catalog-badges span,
.pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  background: rgba(59, 28, 98, 0.08);
  color: var(--primary);
  border: 1px solid rgba(59, 28, 98, 0.12);
  padding: .35rem .75rem;
  font-size: .82rem;
  font-weight: 800;
}

.pill {
  background: color-mix(in srgb, var(--book-color, var(--primary)) 14%, #ffffff);
  color: color-mix(in srgb, var(--book-color, var(--primary)) 75%, #111111);
  border-color: color-mix(in srgb, var(--book-color, var(--primary)) 20%, #ffffff);
}

.pill-light {
  background: #f7f7f7;
  color: #555;
  border: 1px solid var(--border);
}

.pill-featured {
  background: var(--gold);
  color: #5d4300;
  border: none;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: .78rem 1rem;
  font-weight: 800;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-secondary {
  background: #fff;
  color: var(--primary);
  border: 1px solid var(--border);
}

/* Commercial Card */

.commercial-card {
  border-radius: 24px;
  padding: 1.5rem;
}

.commercial-card h2 {
  margin-top: 0;
  color: var(--primary);
}

.commercial-card dl {
  margin: 0;
}

.commercial-card div {
  border-top: 1px solid var(--border);
  padding: .75rem 0;
}

.commercial-card dt {
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  font-weight: 800;
}

.commercial-card dd {
  margin: .15rem 0 0;
  font-weight: 700;
}

.catalog-note {
  border-radius: 16px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  color: #3d3d45;
}

/* Toolbar */

.catalog-toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: grid;
  grid-template-columns: 1fr 220px auto;
  gap: .75rem;
  border-radius: 18px;
  padding: .85rem;
  margin-bottom: 1.25rem;
  backdrop-filter: blur(10px);
}

.catalog-toolbar input,
.catalog-toolbar select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .75rem 1rem;
  font-size: .95rem;
  background: #fff;
}

.view-toggle {
  display: flex;
  gap: .4rem;
}

.view-toggle button {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  padding: .7rem .9rem;
  cursor: pointer;
  font-weight: 800;
}

.view-toggle button.active {
  background: var(--primary);
  color: #fff;
}

/* Catalog Grid */

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  align-items: stretch;
}

/* Book Card */

.book-card {
  display: flex;
  flex-direction: column;
  border-radius: 22px;
  overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.book-card:hover {
  transform: translateY(-6px);
  box-shadow:
    0 14px 42px rgba(59,28,98,.12),
    0 4px 8px rgba(0,0,0,.05);
  border-color: var(--book-color, var(--accent));
}

.book-cover {
  background:
    radial-gradient(
      circle at center,
      color-mix(in srgb, var(--book-color, var(--accent)) 24%, transparent),
      transparent 72%
    );
  padding: 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 270px;
  transition: background .25s ease;
}

.book-card:hover .book-cover {
  background:
    radial-gradient(
      circle at center,
      color-mix(in srgb, var(--book-color, var(--accent)) 38%, transparent),
      transparent 72%
    );
}

.book-cover img {
  display: block;
  width: auto;
  height: auto;
  max-width: 200px;
  max-height: 255px;
  object-fit: contain;
  border-radius: 0;
  background: transparent !important;
  box-shadow: none;
}

.book-card:hover .book-cover img {
  transform: scale(1.03);
}

.book-info {
  padding: 1.15rem;
  flex: 1;
}

.book-topline {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-bottom: .65rem;
}

.book-info h2 {
  color: var(--primary);
  font-size: 1.08rem;
  line-height: 1.25;
  margin: 0 0 .45rem;
}

.book-description {
  color: #3d3d45;
  line-height: 1.45;
  margin: 0 0 .65rem;
  font-size: .92rem;
}

.book-meta-line {
  display: grid;
  gap: .25rem;
  color: var(--muted);
  font-size: .85rem;
}

.book-highlights {
  margin: .75rem 0 0 1.1rem;
  padding: 0;
  color: #333;
  font-size: .85rem;
}



/* Expanded Inline Details */

.book-details {
  margin-top: .85rem;
  border-top: 1px solid var(--border);
  padding-top: .75rem;
}

.book-details summary {
  cursor: pointer;
  color: var(--primary);
  font-weight: 800;
  font-size: .86rem;
  list-style: none;
  transition: .18s ease;
}

.book-details summary:hover {
  color: var(--accent);
}

.book-details summary::-webkit-details-marker {
  display: none;
}

.book-details summary::after {
  content: " +";
  color: var(--accent);
}

.book-details[open] summary::after {
  content: " –";
}

.learning-stage {
  margin-top: .75rem;
  padding: .6rem;
  background: #faf9fd;
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: center;
}

.learning-stage span {
  display: block;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  font-weight: 800;
  margin-bottom: .6rem;
}

.learning-stage img {
  width: 100px;
  height: auto;
  margin: .25rem auto;
  display: block;
}

.learning-stage strong {
  display: block;
  margin-top: .45rem;
  color: var(--primary);
  font-size: .95rem;
}

.details-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: .5rem;
  margin-top: .75rem;
}

.details-grid div {
  background: white;
  border: 1px solid #ece8f6;
  border-radius: 10px;
  padding: .7rem;
}

.details-grid span,
.detail-label {
  display: block;
  font-size: .68rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  font-weight: 800;
  margin-bottom: .2rem;
}

.details-grid strong {
  display: block;
  color: var(--primary);
  font-size: .86rem;
}

.audience-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-top: .75rem;
}

.audience-tags span:not(.detail-label) {
  background: #f2f5ff;
  color: var(--primary);
  border: none;
  border-radius: 999px;
  padding: .28rem .55rem;
  font-size: .75rem;
  font-weight: 700;
}

.commercial-notes {
  margin-top: .75rem;
}

.commercial-notes ul {
  margin: .35rem 0 0 1.1rem;
  padding: 0;
}

/* Price */

.book-price {
  margin-top: auto;
  padding: 1rem;
  border-top: 1px solid var(--border);
  background: #fcfcff;
}

.book-price span {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  font-weight: 800;
}

.book-price strong {
  display: block;
  font-size: 1.15rem;
  color: var(--book-color, var(--accent));
}

/* Book Actions */

.book-actions {
  display: grid;
  gap: .55rem;
  margin-top: .9rem;
}

.book-action {
  display: flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  font-weight: 700;
  font-size: .86rem;
  border-radius: 999px;
  padding: .7rem;
  transition: .18s ease;
}

.book-action-primary {
  background: var(--book-color, var(--accent));
  color: white;
}

.book-action-primary:hover {
  filter: brightness(.95);
}

.book-action-secondary {
  background: white;
  color: var(--primary);
  border: 1px solid var(--border);
}

.book-action-secondary:hover {
  background: #fafafa;
}

.book-action.is-disabled {
  opacity: .55;
  pointer-events: none;
  cursor: not-allowed;
}

/* Hidden Items From JS Filter */

.book-card.is-hidden {
  display: none !important;
}

/* List View */

.list-header {
  display: none;
}

.catalog-grid.list-view {
  grid-template-columns: 1fr;
  gap: .45rem;
}

.catalog-grid.list-view .book-card {
  display: grid;
  grid-template-columns: 70px 1fr 145px;
  gap: .75rem;
  align-items: center;
  border-radius: 12px;
  padding: .65rem;
  overflow: visible;
  box-shadow: none;
}

.catalog-grid.list-view .book-card:hover {
  transform: none;
  box-shadow: 0 0 0 1px rgba(0, 151, 178, 0.25);
}

.catalog-grid.list-view .book-cover {
  min-height: auto;
  padding: 0;
  background: transparent;
}

.catalog-grid.list-view .book-cover img {
  width: 52px;
  max-height: 74px;
  border-radius: 6px;
  box-shadow: none;
}

.catalog-grid.list-view .book-info {
  padding: 0;
}

.catalog-grid.list-view .book-info h2 {
  font-size: .95rem;
  margin: 0;
}

.catalog-grid.list-view .book-description,
.catalog-grid.list-view .book-highlights,
.catalog-grid.list-view .book-details,
.catalog-grid.list-view .book-meta-line,
.catalog-grid.list-view .book-topline .pill-light {
  display: none;
}

.catalog-grid.list-view .book-price {
  border-top: 0;
  background: transparent;
  padding: 0;
}

.catalog-grid.list-view .book-actions {
  display: none;
}

/* Responsive */

@media (max-width: 1050px) {
  .catalog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .catalog-hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 850px) {
  .catalog-toolbar {
    position: static;
    grid-template-columns: 1fr;
  }

  .view-toggle {
    justify-content: flex-start;
  }
}

@media (max-width: 680px) {
  .catalog-page {
    padding: 1rem .75rem 3rem;
  }

  .catalog-hero__content,
  .commercial-card {
    border-radius: 18px;
    padding: 1.25rem;
  }

  .catalog-grid {
    grid-template-columns: 1fr;
  }

  .book-cover {
    min-height: 235px;
  }

  .catalog-grid.list-view .book-card {
    grid-template-columns: 56px 1fr;
  }

  .catalog-grid.list-view .book-price {
    grid-column: 2;
  }
}