/* ═══ LIBRARY HUB ═══ */
.library-hub {
  padding: 4.5rem 1.5rem;
  max-width: 1240px;
  margin: 0 auto;
  position: relative;
  z-index: 10;
}

.hub-header {
  text-align: center;
  margin-bottom: 4rem;
}

.hub-title {
  font-family: var(--font-hud);
  font-size: 1.75rem;
  color: var(--yellow);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  margin-bottom: 1rem;
}

.hub-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 650px;
  margin: 0 auto;
  opacity: 0.8;
  line-height: 1.6;
}

.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 2rem;
}

.hub-card {
  background: rgba(19, 19, 26, 0.6);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 20px;
  padding: 3.5rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.hub-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(circle at top right, rgba(245, 196, 0, 0.15), transparent 60%);
  opacity: 0;
  transition: opacity 0.5s;
}

.hub-card:hover {
  transform: translateY(-15px);
  border-color: rgba(245, 196, 0, 0.4);
  background: rgba(25, 25, 35, 0.85);
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.6), 0 0 20px rgba(245, 196, 0, 0.1);
}

.hub-card:hover::before {
  opacity: 1;
}

.hub-card-icon {
  font-size: 3.75rem;
  margin-bottom: 2rem;
  filter: drop-shadow(0 0 20px rgba(255,255,255,0.1));
  transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.hub-card:hover .hub-card-icon {
  transform: scale(1.15) rotate(8deg);
}

.hub-card-name {
  font-family: var(--font-hud);
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.hub-card-desc {
  font-size: 0.85rem;
  color: #a0a0b8;
  line-height: 1.6;
  margin-bottom: 1.75rem;
  flex-grow: 1;
}

.hub-card-action {
  font-size: 0.75rem;
  color: var(--yellow);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 700;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.25rem;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.hub-card-action::after {
  content: '→';
  transition: transform 0.3s;
}

.hub-card:hover .hub-card-action::after {
  transform: translateX(5px);
}

@media (max-width: 768px) {
  .library-hub { padding: 3.5rem 1.5rem; }
  .hub-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .hub-card { padding: 3rem 2rem; }
  .hub-title { font-size: 1.4rem; }
}