:root{--background:#ffffff;--foreground:#171717}body{background:var(--background);color:var(--foreground);font-family:Arial,Helvetica,sans-serif;margin:0;padding:0}input{border:1px solid #ccc;border-radius:6px;padding:.6rem .75rem}button,input{font-size:16px}button{border:none;border-radius:6px;background:#f97316;color:white;padding:.6rem 1rem;cursor:pointer;transition:background .2s}button:hover{background:#ea580c}button:disabled{opacity:.6;cursor:not-allowed}