body{margin:0;color:#1f3250;background:#f5f8f6;font:18px/1.7 system-ui,sans-serif}header,main,footer{max-width:820px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;gap:20px}a{color:#146d53}h1{font-size:clamp(34px,5vw,54px);line-height:1.1}h2{margin-top:36px}code{background:#e5f3eb;border-radius:6px;padding:2px 5px}footer{border-top:1px solid #d6e5dc;font-size:15px}a:focus-visible{outline:3px solid #2b9d77;outline-offset:4px}