/* ===================================================
   Header — 透過ヘッダー
=================================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--header-h);
    display: flex;
    align-items: center;
    background: transparent;
    transition: box-shadow var(--dur-mid) var(--easing);
}

/* ブラーを疑似要素に分離（Safari の fixed + backdrop-filter バグ対策） */
/* .site-header::before {
    content: '';
    position: absolute;
    inset: 0;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 0;
} */

/* スクロール後：ボーダーライン（非表示） */
/* .site-header.is-scrolled {
    box-shadow: 0 1px 0 var(--color-border);
} */

.site-header__inner {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--gutter);
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

/* ロゴ */
.site-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.site-logo__img {
    height: 32px;
    width: auto;
}

/* 透過時はロゴを白抜き（TOPのみ） */
/* body.home .site-header:not(.is-scrolled) .site-logo__img {
    filter: brightness(0) invert(1);
} */

body.home .site-header:not(.is-scrolled) .site-nav__link {
    color: #ffffff;
}

body.home .site-header:not(.is-scrolled) .nav-toggle__bar {
    background: #ffffff;
}

/* TOP以外：透過時は暗色テキスト */
body:not(.home) .site-header:not(.is-scrolled) .site-nav__link {
    color: #333333;
}

body:not(.home) .site-header:not(.is-scrolled) .site-logo__img {
    filter: none;
}

body:not(.home) .site-header:not(.is-scrolled) .nav-toggle__bar {
    background: var(--color-text);
}

/* ナビゲーション */
.site-nav__list {
    display: flex;
    align-items: center;
    gap: 36px;
}

.site-nav__link {
    font-family: var(--font-en);
    font-weight: var(--weight-light);
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-text);
    position: relative;
    padding-bottom: 2px;
    transition: color var(--dur-fast) var(--easing);
}

.site-nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--dur-fast) var(--easing);
}

.site-nav__link:hover::after,
.site-nav__link.is-active::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* ===================================================
   Hamburger Button (SP)
=================================================== */
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    width: 40px;
    height: 40px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    z-index: 200;
}

.nav-toggle__bar {
    display: block;
    width: 24px;
    height: 1px;
    background: var(--color-text);
    transition: transform var(--dur-mid) var(--easing),
                opacity var(--dur-fast) var(--easing);
}

/* open state */
.nav-toggle.is-open .nav-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
    background: var(--color-text) !important;
}
.nav-toggle.is-open .nav-toggle__bar:nth-child(2) {
    opacity: 0;
}
.nav-toggle.is-open .nav-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
    background: var(--color-text) !important;
}

/* ===================================================
   Mobile Nav Modal — 和モダン・中央モーダル
=================================================== */
.nav-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 150;
    background: rgba(42, 41, 39, 0.5);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--dur-mid) var(--easing);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.nav-modal-overlay.is-open {
    display: flex;
    opacity: 1;
}

.nav-modal {
    background: var(--color-bg);
    width: min(600px, 88vw);
    padding: 56px 48px;
    transform: translateY(20px) scale(0.97);
    transition: transform var(--dur-mid) var(--easing),
                opacity var(--dur-mid) var(--easing);
    opacity: 0;
    position: relative;
}

.nav-modal-overlay.is-open .nav-modal {
    transform: translateY(0) scale(1);
    opacity: 1;
}

/* 閉じるボタン */
.nav-modal__close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
    font-size: 20px;
    line-height: 1;
    opacity: 0.6;
    transition: opacity var(--dur-fast) var(--easing);
}

.nav-modal__close:hover {
    opacity: 1;
}

/* モーダル内ロゴ */
.nav-modal__logo {
    margin-bottom: 36px;
}

.nav-modal__logo-img {
    width: 120px;
    height: auto;
    display: block;
}

/* モーダル内ナビ */
.nav-modal__list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.nav-modal__item {
    border-bottom: 1px solid var(--color-border);
}

.nav-modal__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 0;
    font-family: var(--font-en);
    font-weight: var(--weight-light);
    font-size: 12px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--color-text);
    transition: color var(--dur-fast) var(--easing);
}

.nav-modal__link:hover {
    color: var(--color-text-mid);
}

.nav-modal__link-ja {
    font-family: var(--font-ja);
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--color-text-light);
    text-transform: none;
}

/* ===================================================
   Responsive
=================================================== */
.site-nav {
    display: none;
}

@media (min-width: 769px) {
    .nav-toggle__bar {
        width: 50px;
    }
}

@media (max-width: 768px) {
    .site-header {
        height: var(--header-h-sp);
    }
}