/* =====================
   Header
===================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-bg-sub);
    transition: box-shadow 0.3s ease;
}

.site-header.is-scrolled {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.site-header__inner {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    height: 72px;
    justify-content: space-between;
}

/* ロゴ */
.site-header__logo {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-h4);
    font-weight: 700;
    color: var(--color-primary);
    white-space: nowrap;
    flex-shrink: 0;
}

/* ナビゲーション */
.site-header__nav {
    flex: 1;
}

.header-nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    list-style: none;
    margin: 0;
    padding: 0;
}

.header-nav__list a {
    font-size: var(--font-size-nav);
    font-weight: 500;
    color: var(--color-text-main);
    transition: color 0.2s ease;
    white-space: nowrap;
}

.header-nav__list a:hover {
    color: var(--color-primary);
}

/* WEB予約ボタン */
.site-header__cta {
    flex-shrink: 0;
    font-size: var(--font-size-sm);
    padding: var(--space-sm) var(--space-lg);
}

/* ハンバーガー（SP用・PC時は非表示） */
.site-header__hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
    flex-shrink: 0;
}

.site-header__hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text-main);
    border-radius: var(--radius-full);
    transform: transform 0.3s ease, opacity 0.3s ease;
}


/* =====================
   Responsive
===================== */
@media (max-width: 768px) {
    .site-header__hamburger {
        display: flex;
    }

    .site-header__nav {
        display: none;
        position: fixed;
        inset: 72px 0 0 0;
        background-color: var(--color-white);
        padding: var(--space-2xl) var(--space-xl);
        overflow-y: auto;
    }

    .site-header__nav.is-open {
        display: block;
    }

    .header-nav__list {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-lg);
    }

    .header-nav__list a {
        font-size: var(--font-size-lg);
    }

    .site-header__cta {
        display: none;
    }
}