:root{--tx:#1c1f23;--sub:#555d66;--bd:#c9ced4;--soft:#f3f4f6;--marca:#1f3a8a;--rojo:#b3261e}
*{box-sizing:border-box}
html{font-size:100%}
body{margin:0;font-family:"Segoe UI",system-ui,Arial,sans-serif;font-size:1.15rem;line-height:1.7;color:var(--tx);background:#fff}
.aviso{background:#1c1f23;color:#fff;padding:12px 24px;font-size:1rem;line-height:1.5}
main{max-width:800px;margin:0 auto;padding:28px 24px 40px}
h1{font-size:1.7rem;line-height:1.3;margin:0 0 6px}
h2{font-size:1.3rem;margin:30px 0 8px}
h3{font-size:1.05rem;margin:14px 0 4px}
.sub,.ayuda{color:var(--sub);font-size:1rem}
label{display:block;font-weight:600;margin:20px 0 6px}
input[type=text],textarea{width:100%;font:inherit;padding:12px 14px;border:2px solid var(--bd);border-radius:8px;color:var(--tx);background:#fff}
input[type=text]:focus,textarea:focus,button:focus-visible,summary:focus-visible,pre:focus-visible{outline:3px solid var(--marca);outline-offset:2px}
textarea{resize:vertical;line-height:1.55}
#codigo{font-size:1.5rem;letter-spacing:.15em;text-transform:uppercase;max-width:280px}
button{font:inherit;cursor:pointer;border-radius:8px;padding:12px 22px;border:2px solid var(--marca)}
button.primario{background:var(--marca);color:#fff;margin-top:20px}
button.primario:disabled{background:#8a94b8;border-color:#8a94b8;cursor:not-allowed}
button.secundario{background:#fff;color:var(--marca);margin:6px 10px 6px 0}
.error{color:var(--rojo);font-weight:600;margin-top:14px}
.reglas li{margin:8px 0}
.check{display:flex;gap:12px;align-items:center;font-weight:400;margin-top:22px}
.check input{width:22px;height:22px}
.barra{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}
.reloj{font-size:1.7rem;font-weight:700;font-variant-numeric:tabular-nums;border:2px solid var(--tx);border-radius:8px;padding:4px 14px;white-space:nowrap}
.reloj.poco{color:var(--rojo);border-color:var(--rojo)}
.estado{color:var(--sub);font-size:1rem;margin:0 0 6px}
fieldset.datos{border:2px solid var(--bd);border-radius:8px;padding:6px 18px 18px;margin:14px 0 0}
fieldset.datos legend{font-weight:700;padding:0 8px}
code{background:var(--soft);padding:2px 6px;border-radius:4px;font-size:.95em}
pre{background:var(--soft);padding:12px;border-radius:8px;overflow:auto;max-height:260px;font-size:.85rem;line-height:1.45}
details{margin:14px 0}
summary{cursor:pointer;font-weight:600}
.acciones{display:flex;gap:18px;align-items:center;flex-wrap:wrap;margin-top:10px}
footer{max-width:800px;margin:0 auto;padding:0 24px 40px;color:var(--sub);font-size:1rem}
[hidden]{display:none !important}