/* =========================================
   HEADER
========================================= */
:root {
    --color-white:      #FFFFFF;
    --color-white2:     #F2F2F2;
    --color-black:      #000000;
    --color-accent:     #A79A78;
    --color-footer-bg:  #EEEEEE;
    --color-grad1-from: #ECE1C4;
    --color-grad1-to:   #413C2F;
    --color-grad2-from: #F0E3C4;
    --color-grad2-to:   #795E18;
    --font-ja:          'Zen Kaku Gothic New', sans-serif;
    --font-en:          'Roboto', sans-serif;
    --header-height-pc: 80px;
    --header-height-sp: 60px;
}

#site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height-pc);
    z-index: 1000;
    background: rgba(20, 20, 20, 0.9);
    transition: background 0.4s ease;
}

/* トップページのみ：初期状態は透明 */
.home #site-header:not(.is-scrolled) {
    background: transparent;
}

/* アフターサービスページのスクロール前：logo-white を黒に反転 */
.hosho-page #site-header:not(.is-scrolled) .header-logo img {
    filter: brightness(0);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 40px;
}

/* ---- ロゴ ---- */
.header-logo a {
    display: block;
    line-height: 1;
}

.header-logo img {
    height: 38px;
    width: auto;
    display: block;
}

/* ---- PC ナビゲーション ---- */
.header-nav {
    display: flex;
    align-items: center;
    gap: 0;
}

.header-nav ul {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 32px;
}

/* ③ 縦線非表示 */
.header-nav ul li.nav-divider {
    display: none;
}

.header-nav ul li a {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-white);
    text-decoration: none;
    font-family: var(--font-ja);
    font-size: 14px; /* ① */
    font-weight: 400;
    letter-spacing: 0.05em;
    white-space: nowrap;
    transition: opacity 0.2s ease;
}

.header-nav ul li a:hover {
    opacity: 0.6;
}

.nav-icon-wrap {
    width: 28px;
    height: 28px;
    background: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.nav-icon-wrap img {
    width: 14px;
    height: 14px;
    object-fit: contain;
}

/* ---- MENU ボタン ---- */
.menu-toggle {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    /* padding: 4px 0; */
    color: var(--color-white);
}

/* ② ハンバーガー線：幅・間隔調整 */
.menu-toggle .hamburger {
    display: flex;
    flex-direction: column;
    gap: 6px;
    width: 48px;
}

.menu-toggle .hamburger .hamburger-1{
    display: block;
    width: 100%;
    height: 1px;
    background: var(--color-white);
    transition: all 0.3s ease;
}
.menu-toggle .hamburger .hamburger-2{
    display: block;
    width: 80%;
    height: 1px;
    background: var(--color-white);
    transition: all 0.3s ease;
}
.menu-toggle .hamburger .hamburger-3{
    display: block;
    width: 60%;
    height: 1px;
    background: var(--color-white);
    transition: all 0.3s ease;
}

.menu-toggle .menu-label {
    font-family: var(--font-en);
    font-size: 10px;
    font-weight: 400;
    letter-spacing: 0.12em;
    color: var(--color-white);
}

/* =========================================
   FULL-SCREEN MENU OVERLAY
========================================= */
.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-white);
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
    overflow-y: auto;
}

.menu-overlay.is-open {
    opacity: 1;
    visibility: visible;
}

.menu-overlay-inner {
    min-height: 100%;
    display: flex;
    flex-direction: column;
    padding: 0 80px 80px;
}

/* オーバーレイ上部 */
.menu-overlay-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height-pc);
    flex-shrink: 0;
}

.overlay-logo img {
    height: 56px;
    width: auto;
    display: block;
}

.menu-close {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-en);
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--color-black);
    padding: 8px 0;
}

.menu-close::before {
    content: '✕';
    font-size: 16px;
}

/* オーバーレイナビ */
.menu-overlay-nav {
    flex: 1;
    display: flex;
    align-items: center;
    padding: 80px 0;
}

.menu-overlay-nav .nav-columns {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0 80px;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
}

.menu-overlay-nav .nav-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.menu-overlay-nav .nav-col ul li {
    margin-bottom: 40px;
}

.menu-overlay-nav .nav-col ul li a {
    display: flex;
    align-items: baseline;
    gap: 14px;
    text-decoration: none;
    color: var(--color-black);
    transition: opacity 0.2s ease;
}

.menu-overlay-nav .nav-col ul li a:hover {
    opacity: 0.5;
}

.nav-arrow {
    font-family: var(--font-en);
    font-size: 14px;
    color: #999;
    flex-shrink: 0;
    margin-top: 2px;
}

.nav-en {
    font-family: var(--font-en);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 0.06em;
    line-height: 1;
    color: var(--color-black);
}

.nav-ja {
    font-family: var(--font-ja);
    font-size: 12px;
    font-weight: 400;
    color: #999;
    letter-spacing: 0.06em;
    margin-left: 2px;
}

/* =========================================
   SP ヘッダー
========================================= */
@media screen and (max-width: 768px) {
    #site-header {
        height: var(--header-height-sp);
    }

    .header-inner {
        padding: 0 20px;
    }

    .header-logo img {
        height: 30px;
    }

    .header-nav {
        display: none;
    }

    /* オーバーレイ */
    .menu-overlay-inner {
        padding: 0 24px 40px;
    }

    .menu-overlay-header {
        height: var(--header-height-sp);
    }

    .overlay-logo img {
        height: 44px;
    }

    .menu-overlay-nav {
        padding: 40px 0;
        align-items: center;
        justify-content: center;
    }

    .menu-overlay-nav .nav-columns {
        grid-template-columns: max-content;
        gap: 0;
        margin: 0 auto;
    }

    .menu-overlay-nav .nav-col ul li {
        margin-bottom: 32px;
    }

    .menu-overlay-nav .nav-col ul li a {
        justify-content: flex-start;
    }

    .nav-en {
        font-size: 18px;
    }

    .nav-ja {
        font-size: 11px;
    }
}