:root{font-family:Inter,ui-sans-serif,system-ui,"Segoe UI",sans-serif;color:#e8f5f2;background:#071719}*{box-sizing:border-box}body{margin:0}a{color:#81e6cb}header,main,footer{width:min(880px,calc(100% - 36px));margin:auto}header{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 0;border-bottom:1px solid #284648}header nav{display:flex;flex-wrap:wrap;gap:20px;font-size:14px}.brand{font-weight:800;letter-spacing:.08em;color:#e8f5f2;text-decoration:none}main{padding:54px 0 80px}main nav{font-size:13px;color:#90aaa6}h1{font-size:clamp(32px,5vw,50px);line-height:1.13;margin:24px 0}h2{font-size:25px;margin:0 0 15px}h3{font-size:18px;margin:25px 0 7px}p{color:#b7cfca;line-height:1.8}.lead{font-size:18px;color:#d7e7e3}section,aside{margin-top:38px;padding-top:32px;border-top:1px solid #284648}.learning-list{display:grid;gap:12px;padding-left:20px;line-height:1.6}.learning-actions{display:flex;flex-wrap:wrap;gap:18px;align-items:center;margin-top:42px}.button{display:inline-block;padding:12px 17px;background:#66dcc0;border-radius:7px;color:#08201d;text-decoration:none;font-weight:800}footer{display:flex;justify-content:space-between;gap:18px;padding:28px 0;border-top:1px solid #284648;color:#90aaa6;font-size:13px}@media(max-width:620px){header,footer{align-items:flex-start;flex-direction:column}main{padding-top:36px}}