.hero-banner {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  color: #e8e8e8;
  padding: 5rem 2rem;
  text-align: center;
  margin: -1rem -1rem 2rem -1rem;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #ffffff;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 300;
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto 0.3rem auto;
  color: #c8d6e5;
}

.hero-subtitle-vi {
  font-size: 1.1rem;
  font-weight: 300;
  font-style: italic;
  opacity: 0.7;
  max-width: 700px;
  margin: 0 auto;
  color: #c8d6e5;
}

.content-block {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.content-block h2 {
  color: #1a1a2e;
  border-bottom: 2px solid #e94560;
  padding-bottom: 0.5rem;
  margin-top: 2.5rem;
}

.book-card {
  padding: 1.5rem;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  transition: box-shadow 0.2s;
}

.book-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-primary {
  background-color: #e94560;
  border-color: #e94560;
}

.btn-primary:hover {
  background-color: #c0392b;
  border-color: #c0392b;
}