:root { --ink:#1d2433; --muted:#5b6475; --line:#dde2ea; --accent:#1f5fa8; --soft:#f3f6fa; --err:#b42318; --bg:#ffffff; }
@media (prefers-color-scheme: dark) {
  :root { --ink:#e6e9ef; --muted:#9aa3b2; --line:#2c3444; --accent:#5b9be0; --soft:#1a2130; --err:#f0857a; --bg:#11161f; }
}
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--ink); font:16px/1.5 system-ui, "Segoe UI", Roboto, sans-serif; }
main { max-width: 520px; margin: 0 auto; padding: 24px 16px 48px; }
header { border-bottom: 3px solid var(--accent); padding-bottom: 10px; margin-bottom: 20px; }
.marca { font-size: 26px; font-weight: 700; letter-spacing: -0.5px; }
.sub { color: var(--muted); font-size: 14px; }
h1 { font-size: 21px; margin: 8px 0 10px; }
p { margin: 8px 0; }
form { display: grid; gap: 12px; margin-top: 14px; }
label { display: grid; gap: 4px; font-size: 14px; color: var(--muted); }
input { font: inherit; color: var(--ink); background: var(--soft); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.opc { font-size: 12px; }
.check { display: flex; gap: 10px; align-items: flex-start; color: var(--ink); }
.check input { margin-top: 4px; width: 18px; height: 18px; flex: none; }
.trampa { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
button, .boton { display: inline-block; text-align: center; font: inherit; font-weight: 600; color: #fff; background: var(--accent); border: 0; border-radius: 8px; padding: 12px 16px; text-decoration: none; cursor: pointer; }
button:disabled { opacity: .6; cursor: wait; }
.err { color: var(--err); font-size: 14px; }
.nota { color: var(--muted); font-size: 13px; }
ol { padding-left: 20px; }
li { margin: 6px 0; }
.spin { width: 36px; height: 36px; border: 4px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: g 1s linear infinite; margin: 12px 0; }
@keyframes g { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spin { animation: none; } }