:root{--bg:#EDF0F3;--surface:#fff;--ink:#16202B;--ink-2:#465361;--line:#D8DEE5;--accent:#1B5FAA;--accent-ink:#fff;--warn:#9A5A00;--warn-soft:#FAEED6}
@media (prefers-color-scheme:dark){:root{color-scheme:dark;--bg:#0E141A;--surface:#161F28;--ink:#E5EBF1;--ink-2:#A9B5C1;--line:#2A3642;--accent:#6CA9EE;--accent-ink:#0A1520;--warn:#EFB150;--warn-soft:#382810}}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 "IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif}
body{min-height:100vh;display:grid;place-items:center;padding:16px}
.box{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:28px 28px 24px;width:min(400px,100%);box-shadow:0 8px 24px rgba(22,32,43,.08)}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;margin-bottom:18px}
.mark{width:28px;height:28px;border-radius:7px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font:500 12px ui-monospace,Menlo,monospace}
h1{font-size:22px;margin:0 0 4px}
p{margin:0 0 16px;color:var(--ink-2)}
.btn{display:flex;justify-content:center;width:100%;padding:11px 14px;border-radius:9px;border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink);font-weight:600;font-size:15px;font-family:inherit;text-decoration:none;cursor:pointer;margin-top:8px}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.note{background:var(--bg);border-radius:8px;padding:8px 10px}
.warn{background:var(--warn-soft);color:var(--warn);border-radius:8px;padding:8px 10px;font-size:13px}
form{margin:0}