*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;color:#111;background:#fff;line-height:1.5}main{max-width:480px;margin:0 auto;padding:24px 16px}label{display:block;margin-top:12px;font-weight:600}input{width:100%;margin-bottom:12px;padding:10px;border:1px solid #666;border-radius:6px}button,input{min-height:44px;font-size:1rem}button{padding:12px 20px;color:#fff;background:#154c39;border:1px solid #154c39;border-radius:8px;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.6}.ring-button{display:block;width:100%;min-height:88px;margin-top:24px;font-size:1.5rem;font-weight:700;border-radius:12px}