body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f0f4f8;
  color: #222;
}

header {
  background: #0055aa;
  color: white;
  text-align: center;
  padding: 1em;
}

#logo {
  max-width: 200px;
  margin-bottom: 10px;
}

nav ul {
  display: flex;
  justify-content: center;
  background: #007acc;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav li {
  margin: 0 1em;
}

nav a {
  color: white;
  text-decoration: none;
  padding: 1em;
  display: block;
}

nav a:hover {
  background: #005f99;
}

main {
  padding: 2em;
  text-align: center;
}

footer {
  text-align: center;
  background: #ddd;
  padding: 1em;
  margin-top: 2em;
}

.form-nuevo-dni, .form-editar-dni {
  display: flex;
  gap: 1em;
  align-items: center;
  margin-bottom: 1em;
}
.btn {
  padding: 0.3em 1em;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  margin-right: 0.2em;
}
.btn-primary { background: #007bff; color: #fff; }
.btn-success { background: #28a745; color: #fff; }
.btn-warning { background: #ffc107; color: #333; }
.btn-danger { background: #dc3545; color: #fff; }
.btn-secondary { background: #6c757d; color: #fff; }
tr:nth-child(even) { background: #f2f2f2; }
table { box-shadow: 0 2px 8px #0001; }