body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;max-width:820px;margin:0 auto;padding:24px;line-height:1.7;color:#222}
header{border-bottom:3px solid #0b6fa4;padding-bottom:12px} header a{color:#0b6fa4;text-decoration:none}
nav a{margin-right:16px} h1{line-height:1.3} .card{border:1px solid #ddd;border-radius:10px;padding:16px;margin:14px 0}
footer{margin-top:40px;border-top:1px solid #ddd;padding-top:12px;font-size:14px;color:#555}