*{box-sizing:border-box}body{margin:0;background:#f4f7f8;color:#182126;font-family:system-ui,Segoe UI,Arial}main{min-height:100vh;display:grid;place-items:center;padding:20px}section{width:min(620px,100%);background:#fff;padding:38px;border-radius:24px;box-shadow:0 18px 55px #1b303018}.heart{width:58px;height:58px;display:grid;place-items:center;border-radius:18px;background:#e9f8ef;color:#15834a;font-size:30px}h1{font-size:36px;margin-bottom:8px}p{color:#66757b;line-height:1.6}label{display:block;font-weight:700;margin:20px 0 8px}.amounts{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.amounts button{padding:14px;border:1px solid #dbe3e5;border-radius:11px;background:white;font-weight:700}.amounts .on{border-color:#16854b;background:#eef9f2;color:#126b3e}input{width:100%;padding:14px;border:1px solid #d6dfe2;border-radius:11px;font:inherit}small{display:block;color:#7c888d;margin-top:6px}.pay{display:block;width:100%;padding:17px;margin-top:25px;border:0;border-radius:13px;background:#16854b;color:#fff;font-size:17px;text-align:center}.link{text-decoration:none}.err{padding:12px;background:#fff0f0;color:#922;border-radius:10px}@media(max-width:520px){section{padding:24px 18px}.amounts{grid-template-columns:repeat(2,1fr)}}