:root{
  --primary:#004080;--primary-700:#002a66;--accent:#27ae60;
  --bg:#f5f7fa;--card:#fff;--text:#222;--muted:#6b7280;
  --radius:14px;--shadow:0 10px 25px rgba(0,0,0,.08)
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;font:16px/1.55 "Segoe UI",Arial,sans-serif;color:var(--text);background:var(--bg)
}
.wrap{max-width:980px;margin:0 auto;padding:20px}
.header{display:flex;justify-content:space-between;align-items:center}
.brand{margin:0;font-size:22px;color:var(--primary)}
.nav a{color:var(--primary);text-decoration:none;margin-left:14px}
.nav a:hover{color:var(--primary-700);text-decoration:underline}
h2{margin:10px 0 18px;color:var(--primary)}
h3,h4{margin:10px 0;color:var(--primary)}
.footer{color:var(--muted);font-size:13px;margin:30px 0}
.card{
  background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:24px;margin:18px 0
}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:720px){.grid2{grid-template-columns:1fr}}
.stack> *+*{margin-top:12px}
label{display:block;font-weight:600;color:#111;margin-bottom:6px}
input,select{
  width:100%;padding:10px 12px;border:1px solid #d1d5db;border-radius:10px;
  background:#fff;outline:none;transition:border .2s,box-shadow .2s
}
input:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(0,64,128,.15)}
.actions{margin-top:12px}
button{
  background:var(--primary);border:none;color:#fff;padding:11px 18px;
  border-radius:12px;font-weight:600;cursor:pointer;transition:background .2s,transform .05s
}
button:hover{background:var(--primary-700)}
button:active{transform:translateY(1px)}
#resultado.hidden{display:none}
.result{list-style:none;padding:0;margin:12px 0}
.result li{padding:6px 0;border-bottom:1px dashed #e5e7eb}
.ok{color:var(--accent);font-weight:600}
.error{color:#b91c1c;font-weight:600}
.stats{list-style:none;padding:0;margin:8px 0 14px}
.stats li{padding:4px 0}
.table{width:100%;border-collapse:collapse;margin-top:10px}
.table th,.table td{padding:10px;border-bottom:1px solid #e5e7eb;text-align:left}
.table thead th{background:#f0f4fa}