/* Header final tras la transición */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(0,0,0,0.85);
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.5rem 0;
  z-index: 1000;
}

header nav {
  display: flex;
  gap: 2rem;
  font-size: 0.9rem;
}

header nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 300;
  transition: color 0.3s ease;
}

header nav a:hover {
  color: #999;
}

header .logo {
  font-size: 1.5rem;
  font-weight: bold;
}