* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, sans-serif;
  background: #f8fafc;
  color: #1e293b;
  margin: 0;
  padding: 2rem 1rem;
  line-height: 1.6;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

h1 {
  color: #6a5acd;
  margin: 0;
}

.subtitle {
  color: #64748b;
  margin-top: 0.25rem;
}

main {
  max-width: 720px;
  margin: 0 auto;
  display: grid;
  gap: 1rem;
}

.card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
  transition: transform 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
}

.card h2 {
  margin-top: 0;
  color: #6a5acd;
}

.destacado {
  border-color: #a78bfa;
  background: linear-gradient(135deg, #faf5ff, #eef2ff);
}

footer {
  text-align: center;
  margin-top: 2rem;
  color: #64748b;
  font-size: 0.9rem;
}

footer a {
  color: #0891b2;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}