.bg-indigo {
  --bs-bg-opacity: 1;
  --bs-indigo-rgb: 102, 126, 234; /* #6633CC */
  background-color: rgba(var(--bs-indigo-rgb), var(--bs-bg-opacity)) !important;
}

.bg-indigo-gradient {
  --bs-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  background-image: var(--bs-gradient);
  overflow: visible !important;
}

.dropdown-menu {
  --bs-dropdown-link-active-bg: rgba(
    var(--bs-indigo-rgb),
    var(--bs-bg-opacity)
  );
  /* --bs-dropdown-link-active-color: #fff; */
}

.card {
  border: none;
  position: relative;
}

.lift-card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.lift-card:hover {
  transform: translateY(-6px) !important;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35) !important;
}

.card-hover {
  cursor: pointer !important;
  transition: transform 0.3s ease, box-shadow 0.3s ease !important;
}

.card-hover:hover {
  transform: translateY(-10px) !important;
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4) !important;
}

/* Footer */
footer {
  background: #2c3e50;
  color: white;
  padding: 3rem 5%;
  margin-top: 3rem;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.footer-section h3 {
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

.footer-section p,
.footer-section a {
  color: #bdc3c7;
  text-decoration: none;
  display: block;
  margin-bottom: 0.5rem;
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  text-align: center;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid #34495e;
  color: #bdc3c7;
}

.book-card-hover {
    transition: transform .2s, box-shadow .2s;
}
.book-card-hover:hover {
    transform: translateY(-5px);
    box-shadow: 0 .5rem 1rem rgba(0,0,0,.15);
}
.book-overlay {
    position:absolute;
    inset:0;
    background:rgba(0,0,0,.5);
    opacity:0;
    transition:.3s;
}
.book-card-hover:hover .book-overlay {
    opacity:1;
}