/* Dropdown */
.dropdown{
    width:100%;
    max-width:850px;
    margin:15px auto;
    background:#fff;
    border-radius:10px;
    box-shadow:0 3px 10px rgba(0,0,0,.12);
    overflow:hidden;
    box-sizing:border-box;
}

.dropdown-button{
    width:100%;
    background:#1e88e5;
    color:#fff;
    border:none;
    padding:15px 18px;
    font-size:18px;
    font-weight:600;
    text-align:left;
    cursor:pointer;
    position:relative;
    box-sizing:border-box;
}

.dropdown-button::after{
    content:"▼";
    position:absolute;
    right:18px;
    top:50%;
    transform:translateY(-50%);
    transition:.3s;
    font-size:14px;
}

.dropdown.open .dropdown-button::after{
    transform:translateY(-50%) rotate(180deg);
}

.dropdown-content{
    max-height:0;
    overflow:hidden;
    transition:max-height .4s ease;
    padding:0 18px;
    box-sizing:border-box;
}

.dropdown.open .dropdown-content{
    max-height:1000px;
    padding:18px;
}

.dropdown-content ul{
    columns:2;
    column-gap:30px;
    margin:0;
    padding-left:18px;
}

.dropdown-content li{
    margin:6px 0;
    font-size:15px;
    line-height:1.5;
}

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

    .dropdown{
        margin:12px auto;
    }

    .dropdown-button{
        font-size:16px;
        padding:14px 16px;
    }

    .dropdown-content{
        padding:0 16px;
    }

    .dropdown.open .dropdown-content{
        padding:16px;
    }

    .dropdown-content ul{
        columns:1;
    }

    .dropdown-content li{
        font-size:14px;
    }
}

/* Mobile */
@media (max-width:480px){

    .dropdown{
        border-radius:8px;
        margin:10px auto;
    }

    .dropdown-button{
        font-size:15px;
        padding:12px 14px;
        line-height:1.4;
    }

    .dropdown-button::after{
        right:14px;
        font-size:12px;
    }

    .dropdown-content{
        padding:0 14px;
    }

    .dropdown.open .dropdown-content{
        padding:14px;
    }

    .dropdown-content ul{
        columns:1;
        padding-left:16px;
    }

    .dropdown-content li{
        font-size:13px;
        line-height:1.6;
    }
}