:root{--bg:#f6f7f9;--card:#fff;--ink:#1d2433;--muted:#6b7385;--line:#e3e6ec;--pri:#1f9d74;--pri-ink:#fff;--warn:#fff4d6;--bad:#c62828}
@media (prefers-color-scheme:dark){:root{--bg:#14171c;--card:#1d2128;--ink:#e8ebf0;--muted:#9aa3b2;--line:#2c323c;--warn:#3a3220;--pri:#2cc992;--pri-ink:#062}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 'Malgun Gothic',-apple-system,system-ui,sans-serif}
header{padding:16px;text-align:center}h1{font-size:20px;margin:0}
main{max-width:520px;margin:0 auto;padding:0 16px 48px}
section{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:12px 0}
h2{font-size:17px;margin:4px 0 10px}
label{display:block;margin:10px 0;font-weight:600}
input{display:block;width:100%;margin-top:4px;font:inherit;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);min-height:46px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;font:inherit;border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:10px;padding:10px 16px;min-height:46px;text-decoration:none;cursor:pointer}
.btn.pri{background:var(--pri);border-color:var(--pri);color:var(--pri-ink);font-weight:700}.wide{width:100%}
.row{display:flex;gap:8px;flex-wrap:wrap}
.muted{color:var(--muted);font-size:14px;font-weight:400}.err{color:var(--bad);min-height:1.4em}
.warn{background:var(--warn)}.hidden{display:none!important}
.qr{display:block;margin:10px auto;width:260px;max-width:100%;background:#fff;padding:8px;border-radius:8px;image-rendering:pixelated}
ol{padding-left:22px;margin:6px 0}li{margin:5px 0}