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

body {
  font-family: "Segoe UI", Roboto, sans-serif;
  line-height: 1.7;
  color: #333;
  background: #f5f7fa;
  padding: 2rem;
  text-align: justify;
}

/* Cabecera */
.site-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.site-header h1 {
  font-size: 2.2rem;
  color: #1a1a1a;
  margin-bottom: 0.3rem;
}

.subtitle {
  font-size: 1rem;
  color: #777;
}

/* Tarjetas */
.card {
  margin-bottom: 2rem;
  padding: 1.8rem;
  background: #fff;
  border-radius: 12px;
  border: 1px solid #e0e0e0;
  box-shadow: 0 6px 14px rgba(0,0,0,0.08);
}

h2 {
  margin-bottom: 1rem;
  font-size: 1.5rem;
  color: #2a2a2a;
  text-align: left;
}

h3 {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  font-size: 1.15rem;
  color: #444;
}

/* Listas */
ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.firma {
  margin-top: 1rem;
  font-style: italic;
  color: #555;
}

/* Botón centrado */
details summary {
  cursor: pointer;
  display: block;
  margin: 0 auto 1rem auto;
  text-align: center;
  width: fit-content;
  background: linear-gradient(135deg, #0056a4, #003d73);
  color: white;
  padding: 0.7rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transition: background 0.25s ease, transform 0.15s ease;
  list-style: none; /* Quita el triangulito */
  box-shadow: 0 3px 6px rgba(0,0,0,0.15);
}

details summary:hover {
  background: linear-gradient(135deg, #004080, #002f59);
  transform: translateY(-1px);
}

details[open] summary {
  margin-bottom: 1.2rem;
}

/* Footer */
.site-footer {
  text-align: center;
  font-size: 0.9rem;
  color: #666;
  margin-top: 3rem;
  border-top: 1px solid #ddd;
  padding-top: 1rem;
}