:root{--bg:#f3f4f6;--card:#fff;--ink:#111827;--muted:#6b7280;--line:#e5e7eb;--pri:#2563eb;--pri-ink:#fff;--ok:#059669;--warn:#b45309;--err:#dc2626}
@media (prefers-color-scheme:dark){:root{--bg:#0b0f17;--card:#151b26;--ink:#e5e7eb;--muted:#9ca3af;--line:#273043;--pri:#3b82f6}}
*{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,"Apple SD Gothic Neo","Malgun Gothic",sans-serif}
main{max-width:480px;margin:0 auto;padding:12px 16px 32px}
main.wide{max-width:960px}
a{color:var(--pri)}
.top{padding:6px 0 10px}.logo{font-weight:800;text-decoration:none;color:var(--ink)}
.devbar{background:#fef3c7;color:#92400e;font-size:13px;padding:6px 16px;text-align:center}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;margin:0 0 12px}
.hero{text-align:center}
h1{font-size:22px;margin:0 0 8px}h2{font-size:17px;margin:0 0 10px}
.muted{color:var(--muted)}.small{font-size:13px}
.mono,.codeinput{font-family:ui-monospace,Consolas,monospace;letter-spacing:.08em}
.car{font-size:24px;font-weight:800;margin-bottom:4px}
.big-emoji{font-size:44px}
.btn{display:block;width:100%;padding:14px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--ink);
  font:inherit;font-weight:700;text-align:center;text-decoration:none;cursor:pointer}
.btn.primary{background:var(--pri);border-color:var(--pri);color:var(--pri-ink)}
.btn.big{font-size:19px;padding:18px;margin-top:12px}
.btn.danger{color:var(--err);border-color:var(--err);background:transparent}
.stack>*+*{margin-top:10px}
.row{display:flex;gap:8px;flex-wrap:wrap}.row>*{flex:1;min-width:120px}
label{display:block;font-weight:600;font-size:14px}
input,select,textarea{width:100%;margin-top:4px;padding:12px;border:1px solid var(--line);border-radius:10px;font:inherit;background:var(--bg);color:var(--ink)}
label.inline{display:flex;gap:8px;align-items:flex-start;font-weight:400}label.inline input{width:auto;margin-top:4px}
.codeform .codeinput{font-size:26px;text-align:center;text-transform:uppercase;margin-bottom:10px}
.choices{display:grid;gap:8px;margin-bottom:8px}
.choice{display:block;font-weight:500;position:relative}.choice input{position:absolute;opacity:0;width:1px;height:1px;margin:0;top:0;left:0}
.choice span{display:block;padding:13px 14px;border:1.5px solid var(--line);border-radius:12px}
.choice input:checked+span{border-color:var(--pri);background:color-mix(in srgb,var(--pri) 12%,transparent);font-weight:700}
.choice input:focus-visible+span{outline:2px solid var(--pri)}
.flash{padding:12px;border-radius:10px;margin:8px 0;font-size:14px}
.flash.err{background:color-mix(in srgb,var(--err) 12%,transparent);color:var(--err)}
.flash.ok{background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--ok)}
.flash.warn{background:color-mix(in srgb,var(--warn) 14%,transparent);color:var(--warn)}
.waiting{font-weight:700;display:flex;align-items:center;gap:8px}
.dot{width:10px;height:10px;border-radius:50%;background:var(--pri);animation:p 1.2s infinite}
@keyframes p{50%{opacity:.25}}
.ack{font-size:18px;color:var(--ok)}
.list{list-style:none;padding:0;margin:0}.list li{padding:10px 0;border-bottom:1px solid var(--line);font-size:14px}
.tag{display:inline-block;font-size:12px;padding:1px 8px;border-radius:99px;background:var(--bg);color:var(--muted)}
.tag.ack{color:var(--ok)}.tag.failed{color:var(--err)}
.prose h2{margin-top:16px}
footer{text-align:center;font-size:12px;margin-top:20px}footer a{color:var(--muted)}
h3{font-size:15px;margin:16px 0 4px}
.btn.small{width:auto;display:inline-block;padding:8px 14px;font-size:14px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.keybox{background:color-mix(in srgb,var(--warn) 10%,transparent);border-radius:10px;padding:10px 12px;font-size:14px}
.keybox p{margin:0 0 8px}
.steps{padding-left:18px;margin:8px 0 14px}.steps li{margin:4px 0}
.inline-form{display:inline}.linkbtn{background:none;border:0;color:var(--err);font:inherit;font-size:13px;cursor:pointer;padding:0 4px}
details{margin-top:12px}summary{cursor:pointer;font-weight:600;font-size:14px}
.qrbox{width:180px;margin:8px auto;background:#fff;padding:6px;border-radius:8px}.qrbox svg{display:block;width:100%;height:auto}
.guide-btns{display:flex;flex-direction:column;gap:8px;margin:10px 0 4px}
.guide-btns .btn{color:var(--ink)}.guide-btns .btn.primary{color:var(--pri-ink)}
.flash ol{margin:8px 0 0;padding-left:20px;color:var(--ink)}
.lockcard h1{margin-top:6px}
.ios-guide{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:50;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;padding:16px 16px 8px}
.ios-card{background:var(--card);color:var(--ink);border-radius:16px;padding:18px;max-width:440px;width:100%}
.ios-card ol{padding-left:20px;margin:8px 0 14px}.ios-card li{margin:8px 0}.ios-card small{color:var(--muted)}
.ios-ico{display:inline-block;border:1.5px solid var(--pri);color:var(--pri);border-radius:6px;padding:0 5px;font-size:13px}
.ios-arrow{font-size:40px;color:#fff;animation:bob 1s ease-in-out infinite;line-height:1;margin-top:6px}
@keyframes bob{50%{transform:translateY(8px)}}
.plate-no{font:800 40px/1.1 ui-monospace,Consolas,monospace;letter-spacing:.12em;display:inline-block;border:2px solid var(--ink);border-radius:8px;padding:2px 14px;margin:4px 0 6px}
.plate-input{font:700 24px ui-monospace,Consolas,monospace;letter-spacing:.3em;text-align:center;max-width:180px}
.center{text-align:center}
.btn.waiting-btn{background:var(--bg);border-color:var(--line);color:var(--muted);opacity:1;font-variant-numeric:tabular-nums}
.req{color:var(--err);font-size:13px}
.hero{position:relative}
.call-corner{position:absolute;top:12px;right:12px;width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line);background:var(--bg);color:var(--ok);text-decoration:none}
.call-corner:active{transform:scale(.94)}
#sound-hint{background:color-mix(in srgb,var(--pri) 12%,transparent);color:var(--ink)}
.live-alert{border:2px solid var(--pri);border-radius:12px;padding:12px;margin:10px 0;animation:pulse 1.2s ease-in-out 3}
.live-alert p{margin:6px 0 10px}
@keyframes pulse{50%{box-shadow:0 0 0 6px color-mix(in srgb,var(--pri) 25%,transparent)}}
.sent-item{border-top:1px solid var(--line);padding:10px 0;border-radius:10px}
.sent-item:first-child{border-top:0;padding-top:0}
.sent-item .sent-msg{margin:0 0 6px;font-size:14px}
.sent-item.acked-new .ack{font-size:20px;font-weight:700}
.flash-ack{animation:ackflash 1.4s ease-in-out 2}
@keyframes ackflash{50%{background:color-mix(in srgb,var(--ok) 22%,transparent);box-shadow:0 0 0 8px color-mix(in srgb,var(--ok) 22%,transparent)}}