body{color:#111;background:#f6f7f9;margin:0;font-family:system-ui,Arial}main{max-width:820px;margin:30px auto;padding:0 18px}.card{background:#fff;border:1px solid #ddd;border-radius:14px;margin:14px 0;padding:16px;box-shadow:0 1px 4px #0001}input,textarea{box-sizing:border-box;width:100%;font:inherit;border:1px solid #ccc;border-radius:10px;margin:8px 0;padding:11px;display:block}textarea{min-height:100px}button{color:#fff;cursor:pointer;background:#111;border:0;border-radius:10px;padding:10px 16px}.ok{color:#087b32}.bad{color:#b00020}.qr{background:#fff;border:1px solid #ddd;border-radius:8px;max-width:320px;padding:12px}pre{white-space:pre-wrap;color:#0f0;background:#111;border-radius:12px;padding:14px;overflow:auto}