body{font:16px system-ui,sans-serif;margin:0;color:#183044;background:#f2f7fb}header{display:flex;justify-content:space-between;padding:20px max(24px,calc((100% - 900px)/2));background:white}nav{display:flex;gap:20px}a{color:#1368ce}main{max-width:860px;margin:60px auto;padding:0 24px}.tag{color:#438e71}h1{font-size:42px}.button,button{display:inline-block;background:#1368ce;color:white;border:0;padding:12px 18px;border-radius:8px;text-decoration:none;cursor:pointer}section{padding:20px;background:white;border-radius:12px}