.biblio-hero {
  background: linear-gradient(135deg, #0F172A, #01579B, #0EA5E9);
  padding: 60px 20px; text-align: center; color: #fff; position: relative; overflow: hidden;
}
.biblio-hero::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}
.biblio-hero h1 { font-family: 'Nunito', sans-serif; font-size: 2.4rem; font-weight: 900; position: relative; z-index: 1; margin-bottom: 8px; }
.biblio-hero p { font-size: 1rem; opacity: 0.9; position: relative; z-index: 1; max-width: 500px; margin: 0 auto 20px; }
.biblio-hero .hero-badge {
  display: inline-block; background: rgba(255,255,255,0.12); backdrop-filter: blur(6px);
  padding: 6px 16px; border-radius: 20px; font-size: 0.8rem; position: relative; z-index: 1;
}
.biblio-container { max-width: 1200px; margin: 0 auto; padding: 40px 20px 60px; }
.biblio-filters {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 32px;
}
.biblio-filters button {
  padding: 10px 22px; border: 2px solid #E2E8F0; border-radius: 30px;
  background: #fff; font-family: inherit; font-size: 0.85rem; font-weight: 600;
  color: #64748B; cursor: pointer; transition: all 0.25s;
}
.biblio-filters button:hover { border-color: #0EA5E9; color: #0EA5E9; }
.biblio-filters button.active { background: linear-gradient(135deg, #0EA5E9, #01579B); color: #fff; border-color: transparent; }
.biblio-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 24px;
}
.biblio-card {
  background: #fff; border-radius: 16px; overflow: hidden;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06); transition: all 0.3s;
  cursor: pointer; display: flex; flex-direction: column;
}
.biblio-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,0.1); }
.biblio-card .card-img {
  aspect-ratio: 4/5; overflow: hidden; position: relative; background: #F1F5F9;
}
.biblio-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s; }
.biblio-card:hover .card-img img { transform: scale(1.05); }
.biblio-card .card-badge {
  position: absolute; top: 10px; left: 10px;
  padding: 4px 10px; border-radius: 6px; font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
}
.biblio-card .card-badge.numerique { background: #DCFCE7; color: #166534; }
.biblio-card .card-badge.physique { background: #DBEAFE; color: #1E40AF; }
.biblio-card .card-body { padding: 14px 16px 16px; flex: 1; display: flex; flex-direction: column; }
.biblio-card .card-body .card-category { font-size: 0.7rem; color: #0EA5E9; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
.biblio-card .card-body h3 { font-family: 'Nunito', sans-serif; font-size: 1rem; font-weight: 800; margin-bottom: 2px; }
.biblio-card .card-body .card-author { font-size: 0.78rem; color: #64748B; margin-bottom: 8px; }
.biblio-card .card-body .card-desc { font-size: 0.78rem; color: #94A3B8; line-height: 1.5; flex: 1; }
.biblio-card .card-foot { display: flex; align-items: center; justify-content: space-between; margin-top: 12px; }
.biblio-card .card-foot .card-price { font-family: 'Nunito', sans-serif; font-weight: 900; font-size: 1.1rem; color: #01579B; }
.biblio-card .card-foot .card-price span { font-size: 0.75rem; font-weight: 600; color: #94A3B8; }
.biblio-card .btn-order {
  padding: 6px 16px; border: none; border-radius: 8px;
  background: linear-gradient(135deg, #0EA5E9, #01579B); color: #fff;
  font-size: 0.78rem; font-weight: 700; cursor: pointer; transition: all 0.2s;
}
.biblio-card .btn-order:hover { transform: scale(1.05); }

/* Overlay / Modal */
.biblio-overlay {
  display: none; position: fixed; inset: 0; background: rgba(15,23,42,0.6);
  backdrop-filter: blur(4px); z-index: 1000; align-items: center; justify-content: center;
  padding: 20px;
}
.biblio-overlay.open { display: flex; }
.biblio-modal {
  background: #fff; border-radius: 20px; max-width: 500px; width: 100%;
  max-height: 90vh; overflow-y: auto; padding: 28px; position: relative;
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.3);
}
.biblio-modal .modal-close {
  position: absolute; top: 12px; right: 16px; background: none; border: none;
  font-size: 1.5rem; cursor: pointer; color: #94A3B8; line-height: 1;
}
.biblio-modal .modal-img { width: 100%; aspect-ratio: 4/3; border-radius: 12px; overflow: hidden; margin-bottom: 16px; background: #F1F5F9; }
.biblio-modal .modal-img img { width: 100%; height: 100%; object-fit: cover; }
.biblio-modal .modal-badge {
  display: inline-block; padding: 4px 12px; border-radius: 6px; font-size: 0.72rem; font-weight: 700; text-transform: uppercase; margin-bottom: 8px;
}
.biblio-modal .modal-category { font-size: 0.75rem; color: #0EA5E9; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
.biblio-modal h2 { font-family: 'Nunito', sans-serif; font-size: 1.3rem; font-weight: 800; margin-bottom: 2px; }
.biblio-modal .modal-author { font-size: 0.85rem; color: #64748B; margin-bottom: 12px; }
.biblio-modal .modal-price { font-family: 'Nunito', sans-serif; font-weight: 900; font-size: 1.4rem; color: #01579B; margin-bottom: 12px; }
.biblio-modal .modal-desc { font-size: 0.88rem; color: #475569; line-height: 1.7; margin-bottom: 16px; }
.biblio-modal .form-group { margin-bottom: 12px; }
.biblio-modal label { display: block; font-size: 0.78rem; font-weight: 600; color: #334155; margin-bottom: 4px; }
.biblio-modal input { width: 100%; padding: 10px 14px; border: 1.5px solid #E2E8F0; border-radius: 10px; font-size: 0.9rem; font-family: inherit; transition: border-color 0.2s; }
.biblio-modal input:focus { outline: none; border-color: #0EA5E9; box-shadow: 0 0 0 3px rgba(14,165,233,0.12); }
.biblio-modal .qty-selector { display: flex; align-items: center; gap: 10px; }
.biblio-modal .qty-selector button {
  width: 34px; height: 34px; border: 1.5px solid #E2E8F0; border-radius: 8px;
  background: #fff; font-size: 1.1rem; font-weight: 700; cursor: pointer; transition: all 0.2s;
  display: flex; align-items: center; justify-content: center;
}
.biblio-modal .qty-selector button:hover { border-color: #0EA5E9; color: #0EA5E9; }
.biblio-modal .qty-selector span { font-size: 1rem; font-weight: 700; min-width: 30px; text-align: center; }
.biblio-modal .btn-commander {
  width: 100%; padding: 14px; border: none; border-radius: 12px;
  font-size: 0.95rem; font-weight: 700; cursor: pointer;
  background: linear-gradient(135deg, #0EA5E9, #01579B); color: #fff;
  transition: all 0.25s; margin-top: 8px;
}
.biblio-modal .btn-commander:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(14,165,233,0.35); }
.biblio-modal .btn-commander:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.biblio-modal .alert { display: none; padding: 10px 14px; border-radius: 10px; font-size: 0.82rem; margin-bottom: 12px; }
.biblio-modal .alert.success { display: block; background: #DCFCE7; color: #166534; }
.biblio-modal .alert.error { display: block; background: #FEE2E2; color: #991B1B; }
.biblio-confirmation { display: none; text-align: center; padding: 20px 0; }
.biblio-confirmation .check { width: 60px; height: 60px; background: #DCFCE7; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; font-size: 1.8rem; color: #166534; }
.biblio-confirmation h2 { font-family: 'Nunito', sans-serif; font-size: 1.3rem; font-weight: 800; margin-bottom: 6px; color: #166534; }
.biblio-confirmation p { color: #64748B; font-size: 0.88rem; line-height: 1.6; }
.biblio-confirmation .badge { display: inline-block; margin-top: 14px; padding: 10px 28px; background: linear-gradient(135deg, #01579B, #0EA5E9); border-radius: 12px; font-weight: 800; color: #fff; font-size: 1rem; }

@media (max-width: 600px) {
  .biblio-hero h1 { font-size: 1.6rem; }
  .biblio-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; }
  .biblio-modal { padding: 20px; }
}