body {
    margin: 0;
    background: #85caeb;
}

header {
    width: 100%;
    text-align: center;
    position: relative;
}

header ul {
    width: 90%;
    top: 0;
    margin-top: 0;
    margin-bottom: 0;
    padding: 10px 20px;
    padding-right: 100%;
    background: #134a63;
    opacity: .9;
    color: #fff;
    box-shadow: 0px 5px 3px rgba(0, 0, 0, 0.3);
    list-style: none;
    display: flex;
    justify-content: space-between; /*主軸にそって等間隔*/
    position: fixed;
    z-index: 1;
}

header .top{
    margin: 0;
    padding-top: 3.5px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

header .head {
    display: flex;
    width: 270px;
    justify-content: space-between;
}

header .btn{
    width: 64px;
    height: 24px;
    display: block;
    padding: 10px;
    background:  #3d68cc;
    border-radius: 4px;
    box-shadow: 5px 5px 3px rgba(0, 0, 0, 0.3);
}

header .btn:hover {
    opacity: .8;
    box-shadow: 2px 2px 1px rgba(0, 0, 0, 0.3);;
}

.title_image {
    width: 100%;
    height: 500px;
    margin-top: 70px;
    object-fit: cover;
}

.title_text {
    display: flex;
    justify-content: center;
    position: absolute;
    font-size: 1.5em;
    top: 30%;
    right: 10%;
    left: 10%;

    animation: popup 4s forwards;
}

@keyframes popup {
    0% {
        transform: translate(20px);
        opacity: 0;
    }
    10% {
        transform: translate(20px);
        opacity: 0;
        animation-timing-function: ease-out;
    }
    100% {
        transform: none;
        opacity: 1;
    }
}

.index > h1 {
    font-size: 2em;
    color: #fff;
    text-shadow: 2px 2px 1px black;
}

.container > section {
    display: flex;
    margin: 32px auto;
}

.index img {
    width: 100%;
    box-shadow: 5px 5px 3px rgba(0, 0, 0, 0.3);
}

.index > h1 {
    text-align: center;
    margin: 64px 0;
}

.index .pic {
    width: 70%;
    margin-bottom: 32px;
}

.index section {
    justify-content: space-between;
}

.index section:nth-child(even) {
    flex-direction: row-reverse;
}

.index .info {
    writing-mode: vertical-rl;
    padding-top: 64px;
    margin-left: auto;
    margin-right: auto;
    text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.3);
}

.index .info:nth-child(2) {
    padding-right: 32px;
}

footer {
    padding: 64px;
    padding-bottom: 100%;
    background: #134a63;
    color: #98969c;
    text-align: center;
}

@media (max-width: 700px) {
    .title_text {
        display: block;
        position: absolute;
        font-size: 1em;
        top: 30%;
        right: 10%;
        left: 10%;
    }

    .container > section {
        display: block;
    }

    .index .pic {
        width: 100%;
    }

    .index .info {
        writing-mode: vertical-rl;
        width: 75%;
        margin: 10px 0;
        padding-top: 0;
        padding-right: 10%;
        padding-left: 10%;
    }
}

.activities {
    margin-top: 100px;
}

.activities h1 {
    margin: 0 64px;
}

.activities ul {
    width: 200px;
    margin-left: 32px;
    background-color: oldlace;
    border-radius: 4px;
    padding: 16px;
    
}

.activities li {
    list-style-type: none;
    margin: 32px auto;
    box-shadow: 5px 5px 3px rgba(0, 0, 0, 0.3);
}

.activities li:hover {
    background: #fff;
}

.activities a {
    display: block;
}

.event {
    margin-top: 100px;
}

.event h1 {
    font-size: 2em;
    margin: auto 16px;
}

.event h2 {
    font-weight: normal;
    margin: auto 16px;
}

.event img {
    width: 50%;
    box-shadow: 5px 5px 3px rgba(0, 0, 0, 0.3);
    margin-top: 32px;
}

.event p {
    margin: 16px;
}

.sns {
    margin: 32px;
    margin-top: 100px;
}

.sns div {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-right: 50%;
}

.sns img {
    width: 128px;
    height: 128px;
    object-fit: cover;
    border-radius: 50%;
}