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

body{
background:#f4f6fb;
}

/* HEADER */

.header{
text-align:center;
padding:50px 20px;
background:#2563eb;
color:white;
}

.header h1{
font-size:36px;
margin-bottom:10px;
}

/* CONTAINER */

.container{
display:flex;
justify-content:center;
padding:40px 15px;
}

/* CARD */

.card{
background:white;
padding:35px;
border-radius:10px;
box-shadow:0 10px 25px rgba(0,0,0,0.08);
width:100%;
max-width:420px;
}

/* INPUT */

input{
width:100%;
padding:12px;
font-size:18px;
border:1px solid #ddd;
border-radius:6px;
margin-bottom:20px;
}

/* ROW */

.row{
display:flex;
align-items:center;
gap:10px;
margin-bottom:20px;
}

select{
flex:1;
padding:10px;
border-radius:6px;
border:1px solid #ddd;
}

/* BUTTON */

button{
width:100%;
padding:12px;
background:#2563eb;
border:none;
color:white;
font-size:18px;
border-radius:6px;
cursor:pointer;
}

button:hover{
background:#1d4ed8;
}

/* RESULT */

#result{
margin-top:20px;
text-align:center;
font-size:24px;
}

/* MOBILE */

@media(max-width:480px){

.header h1{
font-size:28px;
}

.card{
padding:25px;
}

.row{
flex-direction:column;
}

select{
width:100%;
}

}