body{
margin:0;
font-family:Arial,Helvetica,sans-serif;
background:#f4f7fb;
color:#222;
}

/* HERO */

.hero{
height:420px;
background:linear-gradient(120deg,#0b2c4d,#0f4c81);
display:flex;
align-items:center;
justify-content:center;
position:relative;
}

.hero-overlay{
position:absolute;
inset:0;
background:rgba(0,0,0,.35);
}

.hero-content{
position:relative;
color:#fff;
text-align:center;
padding:20px;
}

.hero-content h1{
font-size:44px;
margin-bottom:10px;
}

.hero-content p{
font-size:20px;
opacity:.9;
}

/* FORM */

.calculator-area{
padding:70px 20px;
}

.calc-container{
max-width:850px;
margin:auto;
background:#fff;
border-radius:18px;
padding:40px;
box-shadow:0 15px 40px rgba(0,0,0,.08);
}

.type-select{
display:flex;
gap:20px;
margin-bottom:20px;
font-weight:600;
}

.calc-form{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
gap:20px;
}

.input-group{
display:flex;
flex-direction:column;
}

.input-group input{
padding:14px;
border-radius:10px;
border:1px solid #ddd;
font-size:16px;
}

#btnHesapla{
grid-column:1/-1;
padding:16px;
background:#ff7a00;
color:#fff;
border:none;
border-radius:12px;
font-size:18px;
cursor:pointer;
}

/* RESULTS */

.result-area{
padding:60px 20px;
background:#eef3f9;
}

.result-container{
max-width:850px;
margin:auto;
display:grid;
grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
gap:25px;
}

.result-card{
background:#fff;
padding:30px;
border-radius:16px;
text-align:center;
box-shadow:0 10px 30px rgba(0,0,0,.06);
}

.result-card span{
font-size:26px;
font-weight:bold;
color:#0b2c4d;
}

.result-card.highlight{
border:2px solid #ff7a00;
}

/* INFO */

.info-area{
padding:70px 20px;
}

.info-container{
max-width:850px;
margin:auto;
line-height:1.7;
}

/* MOBILE */

@media(max-width:600px){
.hero-content h1{font-size:34px;}
.calc-container{padding:25px;}
}