body{font-family:Arial,sans-serif;max-width:900px;margin:auto;padding:40px;background:#111;color:#eee;line-height:1.6}a{color:#8ecbff}header,footer{padding:20px 0;border-bottom:1px solid #333}footer{border-top:1px solid #333;border-bottom:none;margin-top:40px}.btn{display:inline-block;background:#fff;color:#111;padding:10px 16px;border-radius:6px;text-decoration:none;font-weight:bold}.card{background:#1b1b1b;padding:20px;border-radius:10px;margin:20px 0}nav a{margin-right:16px}