:root{--paper:#f2f4f6;--ink:#17212b;--muted:#5d6b79;--line:#cfd6dd;--blue:#2b45e6;--amber:#e2a11b;--ok:#1c7a4c;--bad:#b3372d}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}main{max-width:680px;margin:0 auto;padding:56px 20px 80px}h1{font-size:clamp(2rem,6vw,3rem);line-height:1.05;letter-spacing:-.03em;margin:0 0 12px}.lead{color:var(--muted);margin:0 0 40px;max-width:52ch}label{display:block;font-weight:600;margin:28px 0 8px}.drop{border:2px dashed var(--line);padding:22px;background:#fff}.drop input,textarea{width:100%}textarea{min-height:96px;padding:12px;font:inherit;border:2px solid var(--line);background:#fff;color:var(--ink);resize:vertical}button{margin-top:24px;padding:14px 28px;font:inherit;font-weight:700;background:var(--blue);color:#fff;border:0;cursor:pointer}button:disabled{background:var(--line);color:var(--muted);cursor:not-allowed}:focus-visible{outline:3px solid var(--amber);outline-offset:2px}.strip{display:flex;gap:3px;height:44px;margin:12px 0 6px}.strip span{flex:1 1;background:var(--blue);min-width:4px}.strip span:nth-child(2n){background:#5468f0}.note{color:var(--muted);font-size:.9rem;margin:0}ol.steps{padding-left:1.2rem;margin:12px 0 0}ol.steps li{padding:4px 0}.keys,ol.steps li{color:var(--muted)}.keys{display:flex;gap:16px;flex-wrap:wrap;margin-top:48px;font-size:.9rem}.keys .on{color:var(--ok);font-weight:600}.keys .off{color:var(--bad);font-weight:600}