:root{
    --bg:#f2f2f7;--card:#fff;--text:#1c1c1e;--muted:#8e8e93;--line:#e5e5ea;
    --blue:#007aff;--blue-soft:#e8f1ff;--green:#34c759;--red:#ff3b30;
}
@media (prefers-color-scheme:dark){
    :root{--bg:#000;--card:#1c1c1e;--text:#f2f2f7;--muted:#98989f;--line:#2c2c2e;--blue:#0a84ff;--blue-soft:#10243f}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
    margin:0;background:var(--bg);color:var(--text);
    font:16px/1.5 -apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",sans-serif;
    padding:calc(env(safe-area-inset-top) + 28px) 18px calc(env(safe-area-inset-bottom) + 40px);
}
.wrap{max-width:520px;margin:0 auto}
a{color:var(--blue);text-decoration:none}

.brand{
    display:flex;align-items:center;justify-content:space-between;gap:12px;
    background:#2a2a2c;border-radius:18px;padding:12px 16px;margin-bottom:26px;
}
.brand img{display:block;height:38px;width:auto}
.brand span{color:#a1a1a6;font-size:13px}

h1{font-size:30px;line-height:1.15;margin:0 0 6px;letter-spacing:-.4px}
h2{font-size:20px;margin:34px 0 10px;letter-spacing:-.2px}
.lead{color:var(--muted);margin:0 0 22px}

.card{background:var(--card);border-radius:18px;overflow:hidden}
.pad{padding:20px}

.app{display:flex;align-items:center;gap:14px;padding:16px}
.app + .app{border-top:1px solid var(--line)}
.app img{width:64px;height:64px;border-radius:15px;box-shadow:0 0 0 1px rgba(0,0,0,.08)}
.app .info{flex:1;min-width:0}
.app .info b{display:block;font-size:17px}
.app .info small{color:var(--muted)}
.reg{
    margin-top:14px;padding:16px;border:1.5px dashed var(--line);border-radius:18px;text-align:center;
}
.reg p{margin:0 0 12px;color:var(--muted);font-size:15px}
.btn-outline{
    display:block;padding:12px;border:1.5px solid var(--blue);border-radius:14px;
    color:var(--blue);font-weight:600;font-size:16px;
}
.btn{
    display:inline-block;border:0;cursor:pointer;
    padding:9px 22px;background:var(--blue);color:#fff;border-radius:20px;
    font:600 15px/1.2 inherit;font-family:inherit;
}
.btn.block{display:block;width:100%;text-align:center;padding:14px;border-radius:14px;font-size:17px}

.steps{list-style:none;margin:0;padding:0;counter-reset:s}
.steps li{counter-increment:s;position:relative;padding:14px 16px 14px 58px}
.steps li + li{border-top:1px solid var(--line)}
.steps li::before{
    content:counter(s);position:absolute;left:16px;top:14px;width:28px;height:28px;border-radius:50%;
    background:var(--blue-soft);color:var(--blue);font-weight:700;font-size:14px;display:grid;place-items:center;
}
.steps li.plain::before{content:"•"}

.group-title{
    margin:26px 4px 8px;color:var(--muted);font-size:13px;font-weight:600;
    text-transform:uppercase;letter-spacing:.6px;
}
.hint{background:var(--blue-soft);color:var(--blue);border-radius:12px;padding:12px 14px;font-size:14px;margin-top:12px}
.note{color:var(--muted);font-size:14px;margin:18px 4px 0}

details{border-top:1px solid var(--line)}
details:first-of-type{border-top:0}
summary{cursor:pointer;padding:14px 16px;font-weight:600;list-style:none;display:flex;justify-content:space-between}
summary::-webkit-details-marker{display:none}
summary::after{content:"›";color:var(--muted);font-size:20px;line-height:1;transform:rotate(90deg);transition:transform .15s}
details[open] summary::after{transform:rotate(-90deg)}
details p{margin:0;padding:0 16px 14px;color:var(--muted);font-size:15px}

input[type=text]{
    width:100%;font-size:22px;letter-spacing:4px;text-align:center;padding:14px;
    border:1px solid var(--line);border-radius:14px;background:var(--bg);color:var(--text);margin-bottom:12px;
}
input[type=text]:focus{outline:2px solid var(--blue);border-color:transparent}
.error{color:var(--red);font-weight:600;margin:0 0 12px}

.center{text-align:center}
.check{
    width:64px;height:64px;border-radius:50%;background:var(--green);color:#fff;font-size:34px;
    display:grid;place-items:center;margin:4px auto 14px;
}
code.udid{
    display:block;margin:10px 0 4px;padding:10px;background:var(--bg);border-radius:10px;
    font:13px ui-monospace,SFMono-Regular,Menlo,monospace;word-break:break-all;user-select:all;
}