/* スクロールスナップで1セクションずつ切り替わるようにするやつ */
html, body {
    height: 100%;
    overflow: hidden;
    font-family: 'Helvetica Neue', 'Noto Sans JP', sans-serif;
    background-color: #f7f7f7;
    line-height: 1.6;
    scroll-behavior: smooth;
}

/* トップページに戻るボタンのスタイル */
.page-top {
    position: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    right: 20px;
    bottom: 20px;
    width: 60px;
    height: 60px;
    font-size: 16px;
    padding-top: 6px;
    font-weight: bold;
    color: #333;
    background: #FFF;
    border: 1px solid #333;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: .2s;
    box-shadow: 3px 3px 0px 0px #333;
    letter-spacing: 1px;
    z-index: 5;
}

.is-active {
    opacity: 1;
    visibility: visible;
}

.page-top.is-active {
    opacity: 1;
    visibility: visible;
}

/* ハンバーガーメニュー */
.menu {
    position: fixed;
    top: 20px;
    left: 20px;
    cursor: pointer;
    z-index: 1000;
}

.menu div {
    width: 50px;
    height: 1px;
    background: #000000;
    margin: 7px 0;
    transition: 0.3s;
}

.menu.active div:nth-child(1) {
    transform: rotate(155deg) translate(2px, -3px);
    background-color: white;
}

.menu.active div:nth-child(2) {
    transform: rotate(-155deg) translate(2px, 3px);
    background-color: white;
}

.nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: #000000e6;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: translateX(-100%);
    transition: 0.3s;
    z-index: 4;
}
.nav-menu.active {
    transform: translateX(0);
}

.nav-menu ul {
    list-style: none;
    text-align: center;
}

.nav-menu ul li {
    margin: 25px 0;
}

.nav-menu ul li a {
    font-size: 40px;
    text-decoration: none;
    color: white;
}