:root{font-family:"Segoe UI",sans-serif;color:#173e35;background:#173e35}body{min-height:100vh;margin:0;display:grid;place-items:center;background:radial-gradient(ellipse at top,#526e61,transparent)}main{box-sizing:border-box;width:min(520px,calc(100% - 32px));padding:32px;background:#fffcf5;border:1px solid #d3e8c8;border-radius:18px}h1{font-size:36px;margin:0}p{line-height:1.5;color:#526e61}form{display:grid;gap:16px}label{display:grid;gap:7px}input,button{box-sizing:border-box;width:100%;font:inherit;padding:12px;border:1px solid #b5c3b7;border-radius:8px}.choice{display:flex;align-items:center;gap:9px}.choice input{width:18px;height:18px;padding:0}.choice a{color:#173e35}button{color:#fffcf5;background:#173e35;cursor:pointer}button:disabled{opacity:.6}#result{color:#173e35}