:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: Canvas; color: CanvasText; }
.card { width: min(360px, calc(100vw - 32px)); padding: 24px; border: 1px solid GrayText; border-radius: 8px; }
h1 { font-size: 1.25rem; margin: 0 0 16px; }
label { display: block; margin: 12px 0; font-size: 0.9rem; }
input { display: block; width: 100%; box-sizing: border-box; margin-top: 4px; padding: 8px; font-size: 1rem; }
button { width: 100%; margin-top: 8px; padding: 10px; font-size: 1rem; cursor: pointer; }
.message { padding: 8px; border-radius: 4px; background: color-mix(in srgb, CanvasText 8%, Canvas); }
.message.error { color: #b00020; }
#qr { display: block; margin: 12px auto; background: #fff; }
.secret { word-break: break-all; text-align: center; }