.site-header {
    text-align: center;
    max-width: 800px;
    border-radius: 10px;
    margin: 0 auto;
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    z-index: 100;
    background: rgb(240 238 238 / 80%);
    transition: transform 0.3s ease;
    backdrop-filter: blur(6px);
}

.site-header.scrolled {
    transform:  translateY(-100%) translateX(-50%);
}

.site-header__inner {
    padding: 12px 24px;
}

.site-header__logo {
    padding: 1rem 0;
    margin: 0 auto;
}

.site-header__logo img {
    width: 400px;
    height: auto;
    display: block;
    margin: 0 auto;
}

.site-header__nav {
    margin: 0 auto;
    padding-top: 8px;
}

.site-header__nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    gap: 24px;
}

.site-header__nav li {
    margin: 0;
}

.site-header__nav a {
    text-decoration: none;
    color: #000;
}

.site-header__nav a:hover {
    text-decoration: underline;
    color: #e6a45e;
}

.site-header__nav li+li::before {
    content: "";
    margin-right: 16px;
    color: #000;
}

/* =========================
    Responsive (Header)
========================= */

@media (max-width: 900px) {

    .site-header {
        max-width: 600px;
    }

    .site-header__inner {
        padding: 10px 16px;
    }

    .site-header__logo img {
        width: 300px;
        /* 400→300 */
    }

    .site-header__nav {
        padding-top: 10px;
    }

    .site-header__nav ul {
        gap: 12px;
        /* 間隔ちょい詰め */
    }

    .site-header__nav a {
        font-size: 14px;
    }
}

@media (max-width: 600px) {
    .site-header {
        margin-top: 0;
        position: sticky;
        top: 0;
        left: 0;
        right: 0;
        max-width: none;
        transform: none;
    }

    .site-header.scrolled {
        transform: translateY(-100%);
    }

    .site-header__inner {
        padding: 10px 12px;
    }

    .site-header__box {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .site-header__logo {
        padding: 0.4rem 0;
        width: 100%;
    }

    .site-header__logo img {
        width: 220px;
    }

    .site-header__nav {
        width: 100%;
        padding-top: 0;
    }

    .site-header__nav ul {
        flex-wrap: wrap;
        justify-content: center;
        row-gap: 2px;
        column-gap: 12px;
    }

    .site-header__nav a {
        font-size: 13px;
        padding: 6px 6px;
    }

    .site-header__nav li+li::before {
        content: "";
        margin: 0;
    }

}