@charset "utf-8";
*{margin: 0; padding: 0;}
ul{list-style: none;}
li{text-decoration: inherit; color: inherit;}
a{text-decoration: inherit; color: inherit;}
button{border-style: none;}
img{vertical-align: top;}

main{width: 100%; height: 300px; position: relative;}
main .mainimg{
    width: 100%; height: 100%;
}
main h1{
    position: absolute;
    right: 33%;
    top: 30%;
}

section{
    width: 100%;
    margin: 0 auto;
}
section h3{
    font-weight: 700;
    text-align: center;
    background-color: gray;
    padding: 10px;
    margin-top: 25px;
    margin-bottom: 25px;
}
.txt{
    width: 100%;
    margin: 0 auto;
}
.title{
    margin: 0 auto;
    width: 100%;
    height: 60vh;
    font-size: 20px;
    font-weight: 700;
    /* padding-bottom: 20px;
    margin-bottom: 20px; */
    display: flex;
}
.title .img{
    width: 70%;
    height: 100%;
    margin-right: 25px;
    margin-left: 25px;
    display: none;
}
.txtbox{
    width: 90%;
    height: 100%;
    margin: 10px auto;
    box-sizing: border-box;
    /*세로 가운데 정렬*/
    display: flex;
    flex-direction: column;
    /* justify-content: center; */
    /*세로 가운데 정렬*/
}
.txtbox h1{
    font-size: 100px;
}
.txtbox h2{
    font-size: 75px;
    border-bottom: 1px solid #333;
    margin-bottom: 25px;
    padding-bottom: 25px;
}
.txtbox ul{
    font-size: 16px;
    font-weight: 700;
    line-height: 25px;
}
.txtbox ul li{
    font-size: 14px;
    color: gray;
    font-weight: normal;
}
.txtbox ul li:first-child{
    margin-top: 25px;
}

.title:nth-child(2n){
    flex-direction: row-reverse /*위치 반전*/
}
.title:nth-child(2n) .img{
    margin-left: 25px;
}
img{
    width: 100%;
    height: 100%;
}



@media all and (min-width:1280px){
    main{
        height: 100vh;
    }
    .title{
        padding-bottom: 20px;
        margin-bottom: 20px;
    }
    .title .img{
        display: block;
    }
    .txtbox{
        width: 25%;
        justify-content: center;
    }

}