:root{
  --bg:#ffffff;
  --fg:#0b1220;
  --muted:#667085;
  --brand:#2563EB;          /* blue-600 */
  --brand-ink:#1e3a8a;      /* indigo-900 */
  --line:#e6e9ef;
  --card:#ffffff;
  --radius:14px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--fg);
  line-height:1.6;
}

.wrap{max-width:1140px;margin:0 auto;padding:0 18px}

header{
  position:sticky;top:0;z-index:10;
  background:rgba(255,255,255,.96);
  backdrop-filter:saturate(1.2) blur(8px);
  border-bottom:1px solid var(--line);
}
header .wrap{display:flex;align-items:center;gap:16px;padding:12px 0}
nav a{display:inline-block;margin-right:10px;padding:6px 12px;border:1px solid var(--line);border-radius:999px;text-decoration:none;color:var(--fg);font-weight:600;font-size:.94rem}
nav a:hover{border-color:color-mix(in oklab,var(--brand) 35%, #fff); color:var(--brand-ink)}

h1{font-size:clamp(2rem,3.6vw,2.8rem);line-height:1.12;margin:22px 0 6px}
h2{font-size:1.5rem;margin:26px 0 8px}
h3{font-size:1.02rem;margin:8px 0 4px}
.lead{font-size:1.05rem;color:var(--muted)}

a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

.section{padding:28px 0;border-top:1px solid var(--line)}

/* COMPACT CARDS GRID */
.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:14px}
.card{
  grid-column:span 6;              /* 2 columnas desktop */
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:14px;
  box-shadow:0 1px 0 rgba(2,6,23,0.02);
}
.card p{margin:0;color:var(--muted);font-size:.96rem}
.card h3{margin:.1rem 0 .25rem}
@media(min-width:1100px){
  .card{grid-column:span 4}       /* 3 columnas en pantallas grandes */
}
@media(max-width:720px){
  .card{grid-column:span 12}      /* 1 columna móvil */
}

ul,ol{padding-left:20px;margin:10px 0}

/* Buttons */
button, .btn{
  display:inline-flex;align-items:center;gap:.5rem;
  background:var(--brand); color:#fff; border:0;
  border-radius:12px; padding:.65rem 1rem; font-weight:700; cursor:pointer;
  box-shadow:0 1px 0 rgba(2,6,23,0.06);
}
.btn.ghost{background:#fff;color:var(--fg);border:1px solid var(--line)}

/* Form elements */
form input, form textarea{
  width:100%; padding:.65rem .75rem; border-radius:10px;
  border:1px solid var(--line); font:inherit; background:#fff;
}
form p{margin:.5rem 0}

/* Footer */
footer{border-top:1px solid var(--line);margin-top:20px;background:#fafbff}
footer .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:12px;padding:18px 0;color:var(--muted)}