:root{--ink:#0b0b0f;--muted:#636370;--line:#e9e6ea;--surface:#fff;--ground:#fafafb;--blue:#2483ff;--red:#ff3029}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:var(--ground);color:var(--ink);font-family:Inter,-apple-system,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
body{min-height:100vh;display:grid;place-items:center;padding:28px;background:radial-gradient(55% 55% at 50% 0%,rgba(36,131,255,.08),transparent 72%),var(--ground)}
.gate{width:min(520px,100%);padding:36px;border:1px solid var(--line);border-radius:18px;background:var(--surface);box-shadow:0 18px 60px -34px rgba(11,11,15,.3);text-align:center}
.mark{display:grid;place-items:center;width:54px;height:54px;margin:0 auto 20px;border:1px solid var(--line);border-radius:15px;background:#fff;box-shadow:0 8px 24px -18px rgba(11,11,15,.35)}
.mark img{display:block;width:40px;height:40px;object-fit:contain}
h1{margin:0;font-size:25px;letter-spacing:-.035em;font-weight:650}
p{margin:10px auto 0;max-width:390px;font-size:14px;line-height:1.6;color:var(--muted)}
.status{display:inline-flex;align-items:center;gap:8px;margin-top:22px;padding:7px 11px;border:1px solid var(--line);border-radius:999px;font-size:12px;color:var(--muted)}
.status i{width:7px;height:7px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 5px rgba(36,131,255,.1);animation:pulse 1.5s ease-in-out infinite}
.status.error i{background:var(--red);box-shadow:0 0 0 5px rgba(255,48,41,.1);animation:none}
.help{display:none;margin:18px auto 0;padding-top:16px;border-top:1px solid var(--line);color:var(--muted);font-size:12px;line-height:1.55}
.help strong{color:var(--ink)}
.gate.has-error .help{display:block}
@keyframes pulse{50%{opacity:.45}}
@media(prefers-reduced-motion:reduce){.status i{animation:none}}