*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:Arial,sans-serif;
}

body{
background:#000;
color:#fff;
}

.hero{
height:50vh;
background:url('https://images.unsplash.com/photo-1497440001374-f26997328c1b?q=80&w=1800&auto=format&fit=crop') center/cover;
position:relative;
display:flex;
justify-content:center;
align-items:center;
text-align:center;
}

.overlay{
position:absolute;
inset:0;
background:rgba(0,0,0,0.65);
}

.hero-content{
position:relative;
z-index:2;
}

.hero h1{
font-size:56px;
margin-bottom:15px;
}

.hero p{
font-size:22px;
color:#ddd;
}

.calculator-section{
padding:80px 8%;
display:flex;
justify-content:center;
}

.calculator-card{
background:#111;
padding:50px;
border-radius:24px;
width:100%;
max-width:800px;
box-shadow:0 20px 60px rgba(0,0,0,0.5);
border:1px solid rgba(255,255,255,0.08);
}

.calculator-card h2{
font-size:42px;
margin-bottom:30px;
text-align:center;
color:#facc15;
}

.calculator-card input{
width:100%;
padding:18px;
margin-bottom:20px;
border:none;
border-radius:12px;
background:#1e1e1e;
color:white;
font-size:18px;
}

.calculator-card button{
width:100%;
padding:18px;
background:#facc15;
border:none;
border-radius:14px;
font-size:20px;
font-weight:bold;
cursor:pointer;
margin-bottom:30px;
}

.results{
margin-bottom:40px;
}

.results h3{
margin-bottom:15px;
color:#fff;
font-size:24px;
}

canvas{
background:white;
padding:20px;
border-radius:20px;
}

@media(max-width:768px){
.hero h1{
font-size:38px;
}

.calculator-card{
padding:30px;
}
}