body{
  margin:0;
  padding:20px;
  background:#f1f5f9;
  font-family:Arial,sans-serif;
  display:flex;
  justify-content:center;
}

.calculator-card{
  width:100%;
  max-width:700px;
  background:#fff;
  padding:40px;
  border-radius:25px;
  box-shadow:0 10px 30px rgba(0,0,0,0.08);
  text-align:center;
}

.calculator-card h2{
  margin-bottom:35px;
  color:#0f172a;
}

.fraction-container{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:25px;
  flex-wrap:wrap;
}

.fraction-box{
  width:160px;
}

.fraction-box input{
  width:100%;
  height:55px;
  border:2px solid #dbe4ee;
  border-radius:12px;
  text-align:center;
  font-size:18px;
  outline:none;
}

.fraction-line{
  height:3px;
  background:#111;
  margin:10px 0;
  border-radius:10px;
}

select{
  width:80px;
  height:55px;
  border-radius:12px;
  border:2px solid #dbe4ee;
  font-size:20px;
  text-align:center;
}

button{
  margin-top:35px;
  width:220px;
  height:55px;
  border:none;
  border-radius:14px;
  background:#2563eb;
  color:white;
  font-size:18px;
  font-weight:600;
  cursor:pointer;
}

button:hover{
  background:#1d4ed8;
}

/* TABLET */
@media(max-width:768px){

  .calculator-card{
    padding:30px 20px;
  }

}

/* MOBILE */
@media(max-width:600px){

  .fraction-container{
    flex-direction:column;
  }

  .fraction-box{
    width:100%;
    max-width:220px;
  }

  select{
    width:100%;
    max-width:220px;
  }

  button{
    width:100%;
  }

}