.header {
    width: 100%;
    height: 50px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 999;
    background-color: transparent; /* 初期状態では透明 */
    transition: background-color 0.3s ease; /* 背景色をスムーズに変更 */
}

.header.scrolled {
    background-color: var(--off_white);
    background-image: linear-gradient(var(--off_white2), var(--off_white2)), url(/assets/img/noise.png);
    background-repeat: repeat;
    background-size: 100px;
    box-shadow: 1px 1px 10px 1px #3333331a;
}

.header__title img {
    max-width: 120px;
}

.header__inner {
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: inherit;
    position: relative;
    max-width: 1280px;
    margin: auto;
}

.header__title img {
    display: block;
    width: 100%;
    height: 100%;
}

/* ヘッダーのナビ部分 */

.header__nav {
    position: absolute;
    right: 0;
    left: 0;
    top: 0;
    width: 100%;
    height: 100vh;
    transform: translateY(-100%);
    transition: ease 0.4s;
}

@media screen and (min-width: 960px) {
    .header__title {
        width: 120px;
    }
}

@media screen and (max-width: 959px) {
    .header__nav {
        background-color: var(--off_white);
        background-image: linear-gradient(var(--off_white2), var(--off_white2)), url(/assets/img/noise.png);
        background-repeat: repeat;
        background-size: 100px;
    }
}

@media screen and (min-width: 960px) {
    .header__nav {
        position: static;
        transform: initial;
        background-color: inherit;
        height: inherit;
        display: flex;
        justify-content: end;
        width: 300px;
    }
}

@media screen and (min-width: 960px) {
    .nav__items {
        width: 100%;
        display: flex;
        align-items: center;
        height: initial;
        justify-content: space-between;
    }
}

.nav-items {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 0;
}

@media screen and (min-width: 960px) {
    .nav-items {
        position: inherit;
        top: 0;
        left: 0;
        transform: translate(0, 0);
    }
}

/* ナビのリンク */
.nav-items__item a {
    color: var(--black);
    width: 100%;
    display: block;
    text-align: center;
    font-size: 14px;
    margin-bottom: 24px;
    color: var(--black);
}

.nav-items__item:last-child a {
    margin-bottom: 0;
}

@media screen and (max-width: 959px) {
    .nav-items__item a {
        font-size: 1.35rem;
    }
}

@media screen and (min-width: 960px) {
    .nav-items__item a {
        margin-bottom: 0;
    }
}

/* ハンバーガーメニュー */

.header__hamburger {
    width: 25px;
    height: 100%;
}

.hamburger {
    background-color: transparent;
    border-color: transparent;
    z-index: 9999;
}

@media screen and (min-width: 960px) {
    .hamburger {
        display: none;
    }
}

/* ハンバーガーメニューの線 */
.hamburger span {
    width: 100%;
    height: 1px;
    background-color: var(--black);
    position: relative;
    transition: ease 0.4s;
    display: block;
}

.hamburger span:nth-child(1) {
    top: 0;
}

.hamburger span:nth-child(2) {
    margin: 8px 0;
}

.hamburger span:nth-child(3) {
    top: 0;
}

/* ハンバーガーメニュークリック後のスタイル */
.header__nav.active {
    transform: translateY(0);
}

.hamburger.active span:nth-child(1) {
    top: 5px;
    transform: rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    top: -13px;
    transform: rotate(-45deg);
}