body{margin:0;font-family:PingFang SC,sans-serif;color:#1f2328;background:#f7f8fa}.page{max-width:880px;margin:0 auto;padding:24px}header{display:flex;justify-content:space-between;align-items:center}nav a{margin-left:16px;color:inherit}section{margin-top:40px}.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}article{background:#fff;padding:16px;border:1px solid #e6e8eb}form{display:grid;gap:8px;max-width:360px}input,button{padding:8px 10px;font:inherit}