body{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;max-width:900px;margin:40px auto;padding:20px;line-height:1.6;color:#222}
h1{font-size:2.4rem}a{color:#0a66c2;text-decoration:none}nav a{margin-right:20px}
.card{border:1px solid #ddd;border-radius:12px;padding:20px;margin:20px 0}
footer{margin-top:50px;color:#666;font-size:.9rem}