*{
  box-sizing:border-box;
}

body{
  margin:0;
  height:100vh;
  background:linear-gradient(135deg,#0a0f2c,#101a4d,#1b2f80);
  display:flex;
  align-items:center;
  justify-content:center;
  font-family:Arial;
  color:white;
  
}

.calc-box{
  width:420px;
  background:rgba(255,255,255,0.08);
  padding:35px;
  border-radius:20px;
  text-align:center;
  box-shadow:0 0 40px rgba(0,0,0,.6);
  max-height:80vh;
  overflow-y:auto;
}

select,input,button{
  width:100%;
  margin-top:14px;
  padding:11px;
  border-radius:10px;
  border:none;
  font-size:15px;
  height: 44px;
}

select,input{
  background:#101a3a;
  color:white;
}

button{
  background:linear-gradient(90deg,#4da3ff,#3b5cff);
  color:white;
  cursor:pointer;
  font-weight:600;
}

#sonuc{
  margin-top:18px;
  line-height:1.6;
}

.back-btn{
  position:absolute;
  top:20px;
  left:20px;
  color:white;
  text-decoration:none;
  opacity:.8;
}
.calc-box{
  width:440px;
  background:linear-gradient(180deg,#1a2555,#0f163a);
  padding:42px;
  border-radius:26px;
  text-align:center;
  box-shadow:0 40px 80px rgba(0,0,0,.6);
}

select,input{
  background:linear-gradient(180deg,#0d1638,#070e2a);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.06);
}
select option{
  background:#0d1638;
  color:white;
}
.copyright{
  position:fixed;
  bottom:12px;
  right:18px;
  font-size:12px;
  opacity:.6;
}
#miniHedef{
  display:none;
  margin-top:18px;
  padding:14px;
  border-radius:12px;
  background:rgba(255,255,255,.06);
  font-size:13px;
}