body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #fff;
  color: #1a1a1a;
}
.loader {
  position: fixed;
  inset: 0;
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.loader img {
  width: 140px;
  animation: spin 2s linear infinite;
}
@keyframes spin {
  0% {transform: rotate(0deg);}
  100% {transform: rotate(360deg);}
}
nav {
  background-color: #002147;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 10px;
}
nav button {
  background: #fff;
  border: 2px solid #cfa32d;
  color: #002147;
  padding: 10px 20px;
  font-weight: bold;
  border-radius: 6px;
  cursor: pointer;
  transition: 0.3s;
}
nav button:hover {
  background: #cfa32d;
  color: #000;
}
main {
  padding: 20px;
}
.seccion {
  display: none;
  animation: fadeIn 0.5s ease;
}
.seccion.visible {
  display: block;
}
h1, h2 {
  text-align: center;
  color: #002147;
}
ul {
  max-width: 600px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}
ul li {
  margin: 10px 0;
  padding: 10px;
  background: #f5f5f5;
  border-left: 4px solid #cfa32d;
}
.galeria-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  max-width: 1000px;
  margin: auto;
}
.galeria-grid img {
  width: 100%;
  border-radius: 8px;
  border: 2px solid #cfa32d;
}
.btn-whatsapp {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #25d366;
  color: #fff;
  font-size: 28px;
  padding: 12px 15px;
  border-radius: 50%;
  text-decoration: none;
  box-shadow: 0 0 10px #00000080;
  z-index: 999;
}
@keyframes fadeIn {
  from {opacity: 0; transform: translateY(20px);}
  to {opacity: 1; transform: translateY(0);}
}