body{
    margin:0;
    font-family:Segoe UI,Arial,sans-serif;
    background:#f3f5f7;
    color:#333;
}

.container{
    max-width:1200px;
    margin:40px auto;
    padding:20px;
}

h1{
    text-align:center;
    color:#1f5e4a;
    margin-bottom:5px;
}

.subtitle{
    text-align:center;
    font-size:20px;
    color:#666;
    margin-bottom:35px;
}

.simulator-grid{
    display:flex;
    gap:30px;
    align-items:flex-start;
}

.left-column,
.right-column{
    flex:1;
    display:flex;
    flex-direction:column;
    gap:25px;
}

.card{
    background:#fff;
    border-radius:16px;
    padding:25px;
    box-shadow:0 8px 25px rgba(0,0,0,.08);
}

.card h2{
    margin-top:0;
    color:#1f5e4a;
    border-bottom:1px solid #ececec;
    padding-bottom:10px;
    margin-bottom:20px;
}

label{
    display:block;
    font-weight:600;
    margin-top:15px;
    margin-bottom:8px;
}

input,
select{

    width:100%;
    padding:14px;

    border:1px solid #d6d6d6;

    border-radius:10px;

    font-size:15px;

    box-sizing:border-box;

}

input:focus,
select:focus{

    outline:none;

    border-color:#1f5e4a;

}

#payment{

    margin-top:25px;

    background:#1f5e4a;

    color:#fff;

    text-align:center;

    font-size:42px;

    font-weight:bold;

    border-radius:16px;

    padding:30px;

}

#payment div{

    font-size:17px;

    font-weight:400;

    margin-top:10px;

    color:white;

}

#summary{

    display:grid;

    grid-template-columns:1fr auto;

    gap:12px;

}

#summary div{

    padding:8px 0;

    border-bottom:1px solid #efefef;

}

button{

    width:100%;

    background:#25D366;

    color:white;

    border:none;

    border-radius:12px;

    padding:18px;

    font-size:18px;

    font-weight:bold;

    cursor:pointer;

    transition:.25s;

}

button:hover{

    transform:translateY(-2px);

    opacity:.95;

}

ol{

    padding-left:22px;

}

ol li{

    margin-bottom:14px;

    line-height:1.5;

}

@media(max-width:900px){

    .simulator-grid{

        flex-direction:column;

    }

}