*{box-sizing:border-box}body{margin:0;font-family:system-ui,Segoe UI,Roboto,Helvetica,Arial;background:#f6f7fb;color:#111}
.shell{min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:16px}
.card{width:100%;max-width:420px;background:#fff;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.08);padding:24px}
h1{margin:0 0 6px;font-size:22px}h2{margin:0 0 12px;font-size:18px}
.sub{margin:0 0 18px;color:#5b6b8c}
.stack{display:flex;flex-direction:column;gap:10px}
input,select,button{font:inherit;padding:10px 12px;border-radius:8px;border:1px solid #d7dbe8}
button{background:#0f1f3d;color:#fff;border:none;cursor:pointer}
button:hover{opacity:.9}
.muted{color:#5b6b8c}.small{font-size:13px}
.msg{padding:10px;border-radius:8px;background:#eef2ff}.msg.err{background:#fef2f2;color:#991b1b}
.msg.ok{background:#ecfdf5;color:#065f46}
.top{display:flex;align-items:center;justify-content:space-between;background:#0f1f3d;color:#fff;padding:10px 16px;flex-wrap:wrap;gap:10px}
.top nav{display:flex;gap:8px;flex-wrap:wrap}
.top button{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.3)}
.top button.active{background:#fff;color:#0f1f3d}
main{max-width:900px;margin:18px auto;padding:0 16px}
.view{display:block}.view[hidden]{display:none}
.qrbox{text-align:center;margin-top:16px}#qrImg{max-width:280px;width:100%}
#qrTimer{margin-top:8px;font-weight:600}