body {
  background-color: #111827;
  color: white;
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}
.container {
  text-align: center;
  padding: 2rem;
}
h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  animation: pulse 2s infinite;
}
h2 {
  font-weight: 300;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.site-header {
  background-color: #0f172a;
  padding: 1rem;
  text-align: center;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 10;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.site-header .tagline {
  color: #f3f4f6;
  font-size: 1.1rem;
  margin: 0;
}

.container {
  margin-top: 100px; /* espacio para que el header no tape */
}