/* Reset básico */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Fuente y fondo general */
body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #e3f2fd, #f9fbe7);
  color: #333;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Encabezado */
header {
  background-color: #1976d2;
  color: white;
  text-align: center;
  padding: 30px 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

header h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
}

header p {
  font-size: 1.1rem;
}

/* Contenido principal */
main {
  flex: 1;
  padding: 40px 20px;
  text-align: center;
}

main h2 {
  margin-bottom: 25px;
  color: #444;
}

/* Botones */
.button-group {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 300px;
  margin: 0 auto;
}

.button-group button {
  background-color: #42a5f5;
  color: white;
  border: none;
  padding: 15px 25px;
  font-size: 1.1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.button-group button:hover {
  background-color: #1e88e5;
}

.button-group button:active {
  transform: scale(0.98);
}

/* Footer */
footer {
  background-color: #1976d2;
  color: white;
  text-align: center;
  padding: 15px;
  font-size: 0.9rem;
  margin-top: auto;
}

/* Responsivo */
@media (min-width: 600px) {
  .button-group {
    flex-direction: row;
    justify-content: center;
  }
}