:root { color-scheme: light dark; --fg: #1a1a1a; --bg: #ffffff; --muted: #666; --line: #ddd; --accent: #1f5fbf; --err: #b00020; }
@media (prefers-color-scheme: dark) { :root { --fg: #eee; --bg: #121212; --muted: #aaa; --line: #333; --accent: #7aa7ff; --err: #ff6b7a; } }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--fg); background: var(--bg); }
main { max-width: 560px; margin: 0 auto; padding: 24px 16px 48px; }
header { display: flex; gap: 8px; align-items: baseline; margin-bottom: 24px; }
.brand { font-weight: 700; font-size: 20px; }
.muted { color: var(--muted); }
h1 { font-size: 22px; margin: 0 0 12px; }
label { display: block; margin: 14px 0; }
input { display: block; width: 100%; margin-top: 4px; padding: 10px; font: inherit; border: 1px solid var(--line); border-radius: 6px; background: transparent; color: inherit; }
input[readonly] { color: var(--muted); }
small { display: block; color: var(--muted); font-size: 13px; }
button { padding: 10px 18px; font: inherit; border: 0; border-radius: 6px; background: var(--accent); color: #fff; cursor: pointer; }
button[disabled] { opacity: .6; cursor: default; }
.err { color: var(--err); font-size: 14px; display: block; min-height: 1.2em; }
#qr { display: block; width: 220px; height: 220px; margin: 12px 0; image-rendering: pixelated; background: #fff; padding: 8px; border-radius: 6px; }
code { word-break: break-all; font-size: 13px; }
details { margin: 8px 0 16px; }
footer { margin-top: 48px; font-size: 13px; }
ol li { margin: 6px 0; }