:root { color-scheme: dark; --bg: #0f1216; --card: #1a1f26; --txt: #e8ecf1; --muted: #9aa4b1; --accent: #f5b301; --bad: #ff6b6b; }
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; font: 15px/1.5 system-ui, sans-serif; background: var(--bg); color: var(--txt); }
main { max-width: 440px; margin: 0 auto; padding: 32px 16px; display: grid; gap: 16px; }
h1 { font-size: 22px; margin: 0; color: var(--accent); } h2 { font-size: 18px; margin: 0 0 6px; }
.card { background: var(--card); border-radius: 12px; padding: 18px; display: grid; gap: 12px; }
label { display: grid; gap: 4px; color: var(--muted); font-size: 13px; }
input { font: inherit; padding: 10px 12px; border-radius: 8px; border: 1px solid #333c47; background: #0f1216; color: var(--txt); }
#codigo { font-size: 24px; letter-spacing: 6px; text-align: center; }
button, .botao { font: inherit; padding: 11px 14px; border-radius: 8px; border: 0; background: var(--accent); color: #111; font-weight: 600; cursor: pointer; text-align: center; text-decoration: none; }
.link { background: none; color: var(--muted); font-weight: 400; padding: 4px; text-decoration: underline; }
.muted { color: var(--muted); margin: 0; font-size: 13px; }
.pequeno { font-size: 12px; }
.pequeno a, .rodape a { color: var(--muted); }
.rodape { margin-top: 24px; text-align: center; font-size: 12px; color: var(--muted); }
.erro { color: var(--bad); margin: 0; font-size: 13px; } .erro:empty { display: none; }