/* --- Refresco visual general --- */
body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background-color: #f9fafb;
  color: #212529;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* --- Navbar --- */
.navbar {
  background: linear-gradient(90deg, #0d6efd, #20c997);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.navbar .nav-link {
  color: #fff !important;
  font-weight: 500;
  transition: opacity 0.2s ease-in-out;
}
.navbar .nav-link:hover {
  opacity: 0.8;
}

/* --- Header --- */
header {
  background: linear-gradient(to right, #e3f2fd, #f8f9fa);
  border-bottom: 1px solid #dee2e6;
}
header h1 {
  font-weight: 700;
  color: #0d6efd;
}
header p {
  color: #6c757d;
}

/* --- Contenido --- */
.card {
  border: none;
  border-radius: 1rem;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
  transition: transform 0.2s ease-in-out;
}
.card:hover {
  transform: translateY(-4px);
}
.card-header {
  background-color: #0d6efd;
  color: #fff;
  font-weight: 600;
}

/* --- Footer fijo al fondo --- */
footer {
  background-color: #0d6efd;
  color: #fff;
  text-align: center;
  padding: 1rem 0;
  margin-top: auto; /* empuja el footer al fondo */
}

/* --- Botones --- */
.btn {
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
  font-weight: 500;
}
.btn:focus {
  box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

/* --- Responsividad --- */
@media (max-width: 576px) {
  header h1 {
    font-size: 1.8rem;
  }
  .card {
    margin-bottom: 1.5rem;
  }
  .navbar .nav-link {
    display: block;
    padding: 0.5rem 0;
  }
}