body{font:18px/1.65 system-ui,sans-serif;color:#253b37;background:#f5f8f6;margin:0}main,header,footer{max-width:960px;margin:auto;padding:28px}header img{width:210px}h1,h2{line-height:1.2}a{color:#09654d}article{background:white;border:1px solid #d7e1dc;border-radius:16px;padding:24px;margin:20px 0}.button{display:inline-block;background:#09654d;color:white;padding:12px 18px;border-radius:8px;text-decoration:none}nav{display:flex;gap:24px;flex-wrap:wrap}