/* ==== Tổng thể ==== */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #fff;
  color: #333;
}

/* Navbar */
.navbar-brand {
  font-size: 1.3rem;
}
.nav-link {
  transition: 0.3s;
}
.nav-link:hover {
  text-decoration: underline;
}

/* Banner */
.banner img {
  height: 400px;
  object-fit: cover;
}

/* Card sách nổi bật */
.featured-books .card {
  transition: transform 0.3s, box-shadow 0.3s;
}
.featured-books .card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

/* Footer */
footer a:hover {
  color: #ffd700;
  transition: color 0.3s;
}

/* Form */
form {
  background: #f8f9fa;
}
form .btn {
  transition: 0.3s;
}
form .btn:hover {
  transform: scale(1.05);
}
/* Video & Map */
section.bg-light {
  background-color: #f8f9fa;
}

.ratio iframe {
  border-radius: 10px;
}

h3.text-primary {
  text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}