:root {
  --bg: var(--tg-theme-bg-color, #ffffff);
  --text: var(--tg-theme-text-color, #111111);
  --hint: var(--tg-theme-hint-color, #8a8a8e);
  --button: var(--tg-theme-button-color, #2481cc);
  --button-text: var(--tg-theme-button-text-color, #ffffff);
  --card: var(--tg-theme-secondary-bg-color, #f2f2f7);
  --link: var(--tg-theme-link-color, #2481cc);
  --danger: var(--tg-theme-destructive-text-color, #d93025);
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
main { max-width: 440px; margin: 0 auto; padding: 20px 16px 32px; }
header { text-align: center; margin-bottom: 16px; }
.logo { font-size: 40px; }
h1 { font-size: 20px; margin: 6px 0 0; }
.card { background: var(--card); border-radius: 14px; padding: 14px 16px; margin-bottom: 16px; }
.card p { margin: 6px 0; }
.card ul { margin: 8px 0; padding-left: 20px; }
.card li { margin: 4px 0; }
.muted { color: var(--hint); font-size: 14px; }
.center { text-align: center; }
label { display: block; font-size: 14px; color: var(--hint); margin: 12px 0 6px; }
input { width: 100%; font-size: 20px; padding: 12px 14px; border-radius: 12px;
  border: 1px solid var(--hint); background: var(--bg); color: var(--text); outline: none; }
input:focus { border-color: var(--button); }
#code { letter-spacing: 6px; text-align: center; }
button { display: block; width: 100%; margin-top: 14px; font-size: 16px; border: 0; cursor: pointer; }
button.primary { background: var(--button); color: var(--button-text); padding: 14px; border-radius: 12px; font-weight: 600; }
button.primary:disabled { opacity: .55; cursor: default; }
button.link { background: none; color: var(--link); padding: 8px; }
.error { background: color-mix(in srgb, var(--danger) 12%, transparent); color: var(--danger);
  border-radius: 12px; padding: 10px 14px; margin: 0 0 14px; }
.qr { display: flex; justify-content: center; margin: 12px 0; }
.qr img { width: 240px; height: 240px; background: #fff; padding: 8px; border-radius: 12px; }
.done { text-align: center; }
.big { font-size: 48px; }
[hidden] { display: none !important; }