:root{color-scheme:light dark;--bg:#f5f6fa;--surface:#fff;--text:#182133;--muted:#697488;--line:#e5e9f1;--accent:#3266e3}*{box-sizing:border-box}body{margin:0;min-height:100svh;display:grid;place-items:center;background:var(--bg);color:var(--text);font:16px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif;padding:24px}main{width:min(660px,100%);text-align:center}h1{font-size:clamp(32px,6vw,44px);font-weight:650;letter-spacing:-1.5px;margin:0 0 8px}#status{color:var(--muted);min-height:48px;margin:0 0 30px;font-size:14px}section{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-bottom:28px}section div{border:1px solid var(--line);border-radius:20px;background:var(--surface);padding:24px 12px}span{display:block;color:var(--muted);font-size:13px;letter-spacing:.3px}strong{display:block;font-size:clamp(32px,7vw,46px);font-weight:550;letter-spacing:-1px;font-variant-numeric:tabular-nums;margin:6px 0}small{color:var(--muted);font-size:12px}button{border:0;border-radius:14px;background:var(--accent);color:#fff;padding:15px 44px;font:600 16px system-ui;cursor:pointer;min-width:180px;transition:transform .15s}button:hover{transform:translateY(-1px)}button:disabled{opacity:.55;cursor:wait}button:focus-visible{outline:3px solid var(--accent);outline-offset:5px}@media(prefers-color-scheme:dark){:root{--bg:#10141d;--surface:#191f2b;--text:#edf1fa;--muted:#94a2ba;--line:#2a3446;--accent:#517ff1}}@media(max-width:400px){body{padding:20px}section{gap:10px}section div{padding:20px 8px}#status{margin-bottom:18px}}@media(prefers-reduced-motion:reduce){button{transition:none}}