html {
        font-size: 100%; /* 16px */
    }
     
    body{
        color: #24292e;
        font-family: "M PLUS 1p";
    }
     
    a {
        text-decoration: none;
    }
     
    p {
        font-size: 1.3rem;/* デフォルトサイズの1.3倍 */
    }
     
    img{
        max-width: 100%;
    }
     
    li{
        list-style: none;
        font-size: 1.1rem;
    }
     
    .wrapper {
        max-width: 960px;
        margin: 0 auto 130px auto;
        font-size: 0.9rem; 
        padding: 0 4% ;
    }
     
    .site-title {
        line-height: 1px;
        font-weight: 600;
        font-size: 2.4rem; 
        font-family: 'Monoton', serif;
    }
     
    .site-title a {
        color:#404546;
    }
     
    .sec-title {
        font-size: 2rem;
        text-align:center; 
        margin-bottom: 65px;
        font-family: 'Kanit', sans-serif;
    }
     
    /* header */
    #header {
        max-width: 960px;
        display: flex; /* 親要素に対してflexを当てると子要素が横並びになる */
        align-items: center;
        justify-content: space-between;
        margin: 0 auto;
        padding: 0 4%;
        height: 170px;
    }
     
    #header ul {
        display: flex;
        padding: 10px 0;
        align-items: center;
    }
     
    #header ul li {
        font-size: 0.9rem;
        margin-left: 30px;
    }
     
    #header ul li a {
        color: #24292a;
        transition: all 0.3s;
    }
     
    #header ul li a:hover{
        opacity: 0.5;
    }
     
    #header li img.icon{
        width: 30px;
    }
     
    /* main */
    #main{
        margin-bottom: 80px;
    }
     
    #main img {
        width: 100%;
        max-width: 1920px;
        height: 400px;
        object-fit: cover;
    }
     
    /* News */
    #news dl {
        display: flex;
        flex-wrap: wrap;
        border-top: 2px dotted #c8c8c8;
        margin-bottom: 20px;
    }
     
    #news dt {
        width: 20%;
        border-bottom: 2px dotted #c8c8c8;
        padding: 15px;
    }
     
    #news dd {
        width: 80%;
        border-bottom: 2px dotted #c8c8c8;
        padding: 15px;
    }
     
    /* Hobby */
    main {
        margin-bottom: 80px;
    }
     
    #hobby-pic {
        margin-top: 70px; 
        text-align: center
    }
     
    #hobby-pic img {
        width: 50%;
        max-width: 1920px;
    }
     
    #hobby-pic p {
        font-size: 0.8rem;
    }
     
    /* assignment */
    #assignment ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
    }
     
    #assignment ul li {
        width: 25%;
        margin-bottom: 23px;
    }
     
    #assignment ul li img {
        cursor: pointer;
        transition: all -0.3s
    }
     
    #assignment ul li img:hover {
        transform: scale(1.2,1.2);
        opacity: 0.6;
    }
     
    /* 携帯用 */
    @media screen and (max-width: 680px){
        .site-title {
            margin-top: 20px;
        }
     
        /* header */
        #header {
            flex-direction: column;
            height: auto;
            line-height: 40px;
            margin-top: 20px;
        }
     
        #header li {
            font-size: 0.8rem;
            margin-left: 20px;
            margin-top: 10px;
        }
     
        #header li img.icon {
            width: 20px;
            margin-top: 15px;
        }
        /* News */
        #news dl{
            flex-direction: column;
        }
     
        #news dt {
            width: 100%;
            border-bottom: none;
            padding-bottom: 0;
        }
     
        #news dd {
            width: 100%;
            padding-top: 0;
        }
        
    }