/* Base */
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  margin: 0;
  padding: 0;
  color: #222;
  background-color: #ffffff;
  line-height: 1.6;
}

/* Estructura */
header, main, footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
}

/* Cabecera */
header {
  border-bottom: 1px solid #e0e0e0;
}

header h1 {
  margin: 0;
  font-size: 2.2rem;
  font-weight: 600;
}

header p {
  margin-top: 8px;
  color: #666;
}

/* Secciones */
section {
  margin-top: 50px;
}

section h2 {
  font-size: 1.4rem;
  margin-bottom: 15px;
  font-weight: 600;
}

/* Listas */
ul {
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

/* Enlaces */
a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Pie */
footer {
  border-top: 1px solid #e0e0e0;
  margin-top: 60px;
  font-size: 0.9rem;
  color: #777;
}

nav {
  margin-bottom: 50px;
}

nav a {
  margin-right: 20px;
  font-weight: 500;
}