.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    box-sizing: border-box;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    padding: 0; /* 念のため余白除去 */
    height: 70px;
}

/* ロゴの背景とボックス */
.header__logo-box {
    background-color: #FFF;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    height: 100%;
}

/* ロゴ画像 */
.header__logo img {
    width: 150.26px;
    height: 55px;
    max-height: none;
    margin: 10px;
}

/* メニュー */
.header__menu-box img {
    max-height: 30px;
    margin: 20px;
    width: 25px;
}

/* スペーサーで中央を押し広げる */
.header__spacer {
    flex-grow: 1;
}

.side-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 250px;
    height: 100%;
    background: #333;
    color: #fff;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    padding: 20px;
    z-index: 1000;
}

.side-menu ul {
    list-style: none;
    padding: 0;
}

.side-menu li {
    margin-bottom: 15px;
}

.side-menu a {
    color: #fff;
    text-decoration: none;
}

.side-menu #closeMenu {
    background: none;
    border: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    position: absolute;
    top: 20px;
    right: 20px;
}

.side-menu.open {
    transform: translateX(0);
}