:root{--brand:#0366d6}body,html{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Helvetica,Arial,sans-serif;margin:0;color:#111}footer,header{padding:16px 24px;border-bottom:1px solid #eee}footer{border-top:1px solid #eee;border-bottom:none;color:#666;text-align:center}main{max-width:960px;margin:0 auto;padding:40px 24px}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.btn{display:inline-block;background:var(--brand);color:#fff;padding:10px 14px;border-radius:6px;text-decoration:none}.btn.outline{background:#fff;border:1px solid var(--brand);color:var(--brand)}.nav a{margin-right:16px}