body{
font-family:Arial, Helvetica, sans-serif;
background:#0f172a;
color:white;
margin:0;
}

header{
background:#020617;
padding:20px;
text-align:center;
}

.container{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
gap:20px;
padding:30px;
}

.card{
background:#1e293b;
padding:20px;
border-radius:10px;
box-shadow:0 0 10px rgba(0,0,0,0.3);
}

h2{
margin-top:0;
}

button{
background:#2563eb;
border:none;
padding:10px;
color:white;
border-radius:6px;
cursor:pointer;
margin-top:5px;
}

button:hover{
background:#1d4ed8;
}

input{
width:100%;
padding:8px;
margin:5px 0;
border-radius:6px;
border:none;
}

pre{
background:#020617;
padding:10px;
border-radius:6px;
height:120px;
overflow:auto;
}

footer{
text-align:center;
padding:15px;
background:#020617;
}