body{
font-family:Arial,sans-serif;
margin:0;
background:#0d1117;
color:white;
text-align:center;
}
.hero{
height:70vh;
background:linear-gradient(135deg,#111,#1f6f4a);
display:flex;
align-items:center;
justify-content:center;
}
.btn{
background:#00c853;
padding:12px 24px;
color:white;
text-decoration:none;
border-radius:8px;
}
section{padding:40px 20px;}
.card{
background:#161b22;
margin:15px auto;
padding:20px;
max-width:400px;
border-radius:10px;
}
footer{
padding:20px;
background:#000;
}