:root{--bg:#0f1724;--card:#111827;--accent:#7c3aed;--muted:#9ca3af;--panel:#0b1220}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:#fff;font-family:Inter,Arial,Helvetica,sans-serif;display:flex;justify-content:center;padding:28px}
.app{width:920px}
header{margin-bottom:18px}
h1{margin:0;font-size:28px}
p{color:var(--muted);margin:4px 0 0}
.card{background:var(--card);padding:18px;border-radius:10px;margin-bottom:14px}
label{display:block;margin-top:10px;color:var(--muted);font-size:13px}
input{width:100%;padding:8px;border-radius:6px;border:1px solid #0f1724;background:#0b1220;color:#fff}
button{margin-top:12px;padding:10px 14px;background:var(--accent);border:none;color:#fff;border-radius:8px;cursor:pointer}
.cols{display:flex;gap:12px}
.cols > div{flex:1}
.resultado{margin-top:12px;padding:12px;background:#0b1220;border-radius:8px;white-space:pre-wrap}
footer{color:var(--muted);margin-top:8px}