:root{--bg:#f4f5f7;--card:#fff;--ink:#1d2330;--mute:#5d6676;--line:#dde1e7;--accent:#1f5fbf;--ok:#1b7f4b;--warn:#a15c00;--bad:#b42318;--code:#eef1f5}
@media (prefers-color-scheme:dark){:root{--bg:#121519;--card:#1b2027;--ink:#e7eaef;--mute:#9aa3b2;--line:#2c333d;--accent:#5b9bff;--ok:#4cc38a;--warn:#f0a945;--bad:#ff6b5e;--code:#252b34}}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
header{display:flex;align-items:center;gap:.6rem;padding:.9rem 1.2rem;border-bottom:1px solid var(--line);background:var(--card)}
header .logo{width:30px;height:30px;border-radius:7px;background:var(--ink);color:var(--bg);display:grid;place-items:center;font-weight:800;font-size:.85rem;letter-spacing:-.5px}
header h1{font-size:1.05rem;margin:0;font-weight:650}
header .sub{color:var(--mute);font-size:.85rem;margin-left:auto}
main{max-width:1080px;margin:0 auto;padding:1.2rem;display:grid;gap:1.2rem;grid-template-columns:1fr 1fr}
@media (max-width:860px){main{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1.2rem}
.card h2{margin:0 0 .6rem;font-size:1.05rem}
button,.btn{appearance:none;border:0;border-radius:9px;padding:.75rem 1.2rem;font:inherit;font-weight:600;cursor:pointer;background:var(--accent);color:#fff;text-decoration:none;display:inline-block;text-align:center}
button.secondary,.btn.secondary{background:transparent;color:var(--ink);border:1px solid var(--line)}
button:disabled{opacity:.5;cursor:default}
.row{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center}
.muted{color:var(--mute);font-size:.9rem}
.status{padding:.55rem .8rem;border-radius:8px;background:var(--code);font-size:.92rem;margin:.8rem 0}
.status.ok{color:var(--ok)}.status.bad{color:var(--bad)}.status.warn{color:var(--warn)}
.qrwrap{display:flex;gap:1.2rem;align-items:center;flex-wrap:wrap;margin-top:.8rem}
#qr{background:#fff;padding:12px;border-radius:10px;width:324px;height:324px;image-rendering:pixelated}
.code{white-space:nowrap;font:700 1.6rem/1 ui-monospace,Menlo,Consolas,monospace;letter-spacing:.08em}
.hidden{display:none!important}
#photo{max-width:100%;border-radius:10px;border:1px solid var(--line);display:block;margin:.6rem 0}
.panel h3{font-size:.95rem;margin:1rem 0 .3rem}
.panel ul{margin:.2rem 0;padding-left:1.2rem}.panel li{margin:.2rem 0}
.yes{color:var(--warn)}.no{color:var(--ok)}
details summary{cursor:pointer;color:var(--mute);font-size:.88rem}
code,.mono{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.82rem;word-break:break-all;background:var(--code);padding:.1rem .3rem;border-radius:4px}
/* phone */
body.phone main{grid-template-columns:1fr;max-width:560px;padding:.8rem}
.viewer{position:relative;background:#000;border-radius:12px;overflow:hidden;aspect-ratio:3/4;display:grid;place-items:center}
.viewer video,.viewer canvas{width:100%;height:100%;object-fit:contain;display:block}
.bigbtns{display:grid;grid-template-columns:1fr 1fr;gap:.6rem;margin-top:.8rem}
.bigbtns button{padding:1rem;font-size:1.05rem}
.bigbtns .full{grid-column:1/-1}
.done{text-align:center;padding:2rem 1rem}.done .check{font-size:3rem;color:var(--ok)}
/* Decisions 7-8: big desktop code + centered match-code picker on the phone */
.bigcode{font-size:4.5rem;letter-spacing:.15em;color:var(--accent)}
.picker{position:fixed;inset:0;z-index:50;background:rgba(0,0,0,.72);display:flex;align-items:center;justify-content:center;padding:1rem}
.picker .box{background:var(--card);color:var(--ink);border-radius:16px;padding:1.4rem 1.2rem;width:100%;max-width:360px;text-align:center;box-shadow:0 10px 40px rgba(0,0,0,.5)}
.picker h2{margin:0 0 .3rem;font-size:1.35rem}
.picker .choices{display:grid;grid-template-columns:1fr 1fr;gap:.7rem;margin:1rem 0 .7rem}
.picker .choices button{font:800 2.2rem/1 ui-monospace,Menlo,Consolas,monospace;letter-spacing:.1em;padding:1rem .4rem;min-height:84px;border-radius:12px;touch-action:manipulation}
footer{max-width:1080px;margin:0 auto;padding:0 1.2rem 1.5rem;color:var(--mute);font-size:.8rem}