:root{
--bg-color:#ffffff;
--text-color:#111111;
--accent-color:#2563eb;
--font-family:Arial;
}

*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:var(--font-family);
}

body{
background:#042354;
display:flex;
justify-content:center;
align-items:center;
height:100vh;
}

.container{
background:white;
padding:30px;
border-radius:12px;
width:600px;
box-shadow:0 10px 30px rgba(0,0,0,0.1);
}

h1{
text-align:center;
margin-bottom:20px;
}

.controls{
display:grid;
gap:10px;
margin-bottom:25px;
}

.preview{
background:var(--bg-color);
color:var(--text-color);
padding:20px;
border-radius:8px;
border:2px solid var(--accent-color);
transition:0.3s;
}

.preview h2{
margin-bottom:10px;
}

.preview button{
margin-top:15px;
padding:10px 15px;
border:none;
background:var(--accent-color);
color:white;
border-radius:6px;
cursor:pointer;
}

.preview button:hover{
opacity:0.9;
}