:root {
  --azul: #1e3a5f;
  --azul-claro: #2c5282;
  --gris: #6b7280;
  --fondo: #f4f4f4;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  background: var(--fondo);
  color: #1f2937;
  line-height: 1.6;
}
a { color: var(--azul-claro); }
header {
  background: var(--azul);
  color: #fff;
  padding: 48px 20px;
  text-align: center;
}
header h1 { font-size: 28px; margin-bottom: 8px; }
header p { color: #cbd5e1; font-size: 15px; }
.search { max-width: 480px; margin: 28px auto 0; }
.search input { width: 100%; padding: 12px 16px; border-radius: 8px; border: none; font-size: 15px; }

main { max-width: 900px; margin: 0 auto; padding: 40px 20px 80px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card {
  display: block;
  background: #fff;
  border-radius: 10px;
  padding: 22px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  border: 1px solid #e5e7eb;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.15s, transform 0.15s;
}
.card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.1); transform: translateY(-2px); }
.card h3 { font-size: 16px; color: var(--azul); margin-bottom: 6px; }
.card p { font-size: 13px; color: var(--gris); }
.pronto {
  display: inline-block; margin-top: 10px; font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px; color: #b45309;
  background: #fef3c7; padding: 2px 8px; border-radius: 20px;
}

.contacto {
  margin-top: 48px; text-align: center; padding: 28px;
  background: #fff; border-radius: 10px; border: 1px solid #e5e7eb;
}
.contacto p { color: var(--gris); font-size: 14px; margin-bottom: 12px; }
.contacto a.boton {
  display: inline-block; background: var(--azul); color: #fff;
  padding: 10px 22px; border-radius: 6px; text-decoration: none;
  font-weight: 600; font-size: 14px;
}

footer { text-align: center; padding: 24px; color: #9ca3af; font-size: 12px; }

/* ── Artículos ── */
.volver {
  display: inline-block; color: #cbd5e1; text-decoration: none;
  font-size: 13px; margin-bottom: 10px;
}
.volver:hover { color: #fff; }
article { background: #fff; border-radius: 10px; padding: 36px 40px; border: 1px solid #e5e7eb; }
article h2 { font-size: 20px; color: var(--azul); margin: 28px 0 10px; }
article h2:first-child { margin-top: 0; }
article p { font-size: 14px; color: #374151; margin-bottom: 12px; }
article ol, article ul { margin: 0 0 14px 22px; font-size: 14px; color: #374151; }
article li { margin-bottom: 6px; }
article strong { color: #111827; }
article .tip {
  background: #eff6ff; border-left: 3px solid var(--azul-claro);
  padding: 10px 14px; border-radius: 4px; font-size: 13px; color: #1e40af; margin: 14px 0;
}
article code {
  background: #f3f4f6; padding: 1px 6px; border-radius: 4px;
  font-size: 12.5px; font-family: 'SFMono-Regular', Consolas, monospace;
}