/* ============================================
   Header CSS
   ヘッダー専用スタイル
   ============================================ */

/* 変数定義 */
:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-text: #262626;
    --color-text-light: rgba(38, 38, 38, 0.7);
    --color-bg: #ffffff;
    --color-bg-overlay: rgba(255, 255, 255, 0.9);
    --border-radius: 8px;
    --spacing-unit: 8px;
}

/* ヘッダー基本スタイル */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    overflow: visible;
    z-index: 50;
    background-color: #ffffff;
    border-bottom: 1px solid rgba(226, 232, 240, 1);
    transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    transform: translateY(-100%);
}

.site-header.site-header--visible {
    transform: translateY(0);
}

.site-header__container {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 16px;
    overflow: visible;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

@media (max-width: 767px) {
    .site-header__container {
        height: 64px;
        padding: 0 12px;
    }
}

/* ロゴ */
.site-header__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
}

.site-header__logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
    text-decoration: none;
    color: var(--color-text);
}

.site-header__logo-icon {
    background-color: var(--color-text);
    padding: var(--spacing-unit);
    border-radius: var(--border-radius);
    color: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.site-header__logo-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.site-header__logo-text--brand {
    font-family: 'Shippori Mincho', serif;
    letter-spacing: 0.08em;
    font-weight: 700;
}

@media (max-width: 767px) {
    .site-header__logo-text {
        font-size: 16px;
    }
    
    .site-header__logo-icon {
        padding: 6px;
    }
    
    .site-header__logo-icon svg {
        width: 16px;
        height: 16px;
    }
}

/* デスクトップメニュー */
.site-header__nav--desktop {
    display: none;
}

@media (min-width: 768px) {
    .site-header__nav--desktop {
        display: flex;
        gap: 32px;
    }
}

@media (min-width: 1024px) {
    .site-header__nav--desktop {
        gap: 48px;
    }
}

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

@media (min-width: 1024px) {
    .primary-menu {
        gap: 48px;
    }
}

.primary-menu__item,
.primary-menu a {
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

.primary-menu__item:hover,
.primary-menu a:hover {
    color: var(--color-primary);
}

.primary-menu__item--has-submenu,
.primary-menu .menu-item-has-children {
    position: relative;
}

.primary-menu__item--has-submenu > a::after,
.primary-menu .menu-item-has-children > a::after {
    content: '▼';
    display: inline-block;
    margin-left: 6px;
    font-size: 10px;
    color: var(--color-text-light);
    transition: transform 0.2s ease;
}

.primary-menu__item--has-submenu:hover > a::after,
.primary-menu .menu-item-has-children:hover > a::after {
    transform: translateY(2px) scale(1.05);
}

.primary-menu__submenu,
.primary-menu .sub-menu {
    display: flex;
    flex-direction: column;
    gap: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    pointer-events: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background-color: #ffffff;
    backdrop-filter: none;
    border: none;
    border-radius: 0;
    box-shadow: 0 12px 30px -12px rgba(15, 23, 42, 0.2);
    padding: 8px 0;
    list-style: none;
    margin: 0;
    z-index: 60;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}

.primary-menu__submenu::before,
.primary-menu .sub-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 0;
    right: 0;
    height: 8px;
    background-color: transparent;
}

.primary-menu__submenu a,
.primary-menu .sub-menu a {
    display: block;
    padding: 12px 16px;
    font-size: 14px;
    letter-spacing: 0.06em;
    color: #0f172a;
    text-transform: uppercase;
    white-space: nowrap;
    border-radius: 0;
    border: none;
    background-color: transparent;
    text-decoration: none;
    transition: color 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
}

.primary-menu__submenu a:hover,
.primary-menu .sub-menu a:hover {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--color-primary);
}

.primary-menu__item--has-submenu:hover .primary-menu__submenu,
.primary-menu .menu-item-has-children:hover > .sub-menu,
.primary-menu .menu-item-has-children:focus-within > .sub-menu {
    display: flex;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.primary-menu__submenu:hover,
.primary-menu .sub-menu:hover {
    display: flex;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

/* プルダウンメニューにホバーした時も親メニュー項目のホバー状態を維持 */
.primary-menu__item--has-submenu:hover .primary-menu__submenu:hover,
.primary-menu .menu-item-has-children:hover > .sub-menu:hover {
    display: flex;
    opacity: 1;
    visibility: visible;
}

/* モバイルメニューボタン */
.site-header__nav--mobile {
    display: block;
}

@media (min-width: 768px) {
    .site-header__nav--mobile {
        display: none;
    }
}

.site-header__menu-btn {
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.3s ease;
    border-radius: 4px;
}

.site-header__menu-btn:hover {
    color: var(--color-primary);
    background-color: rgba(37, 99, 235, 0.1);
}

.site-header__menu-btn svg {
    width: 24px;
    height: 24px;
}

/* モバイルメニュー */
.site-header__mobile-menu {
    display: flex;
    background-color: var(--color-bg);
    border-bottom: 1px solid rgba(226, 232, 240, 1);
    padding: 24px 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    flex-direction: column;
    gap: 16px;
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding-top 0.3s ease, padding-bottom 0.3s ease;
    opacity: 0;
    visibility: hidden;
}

.site-header__mobile-menu:not(.site-header__mobile-menu--hidden) {
    max-height: 500px;
    padding-top: 24px;
    padding-bottom: 24px;
    opacity: 1;
    visibility: visible;
    transition: max-height 0.3s ease, padding-top 0.3s ease, padding-bottom 0.3s ease, opacity 0.2s ease, visibility 0.2s ease;
}

.site-header__mobile-menu--hidden {
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    opacity: 0;
    visibility: hidden;
    transition: max-height 0.3s ease, padding-top 0.3s ease, padding-bottom 0.3s ease, opacity 0.2s ease 0.1s, visibility 0.2s ease 0.1s;
}

@media (min-width: 768px) {
    .site-header__mobile-menu {
        display: none;
        max-height: 0;
        padding: 0;
        opacity: 0;
        visibility: hidden;
    }
}

.site-header__mobile-menu-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.site-header__mobile-menu-list li {
    margin: 0;
    padding: 0;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    will-change: opacity, transform;
}

.site-header__mobile-menu-list li.menu-item-visible {
    opacity: 1;
    transform: translateY(0);
}

.site-header__mobile-menu-list a {
    display: block;
    font-size: 18px;
    font-weight: 500;
    padding: 8px 0;
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

.site-header__mobile-menu-list a:hover {
    color: var(--color-primary);
}

.site-header__mobile-link {
    display: block;
    font-size: 18px;
    font-weight: 500;
    padding: 8px 0;
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
    opacity: 0;
    transform: translateY(-10px);
    will-change: opacity, transform;
}

.site-header__mobile-link.menu-item-visible {
    opacity: 1;
    transform: translateY(0);
}

.site-header__mobile-link:hover {
    color: var(--color-primary);
}

@media (max-width: 767px) {
    .site-header__mobile-link {
        font-size: 16px;
    }
}

.site-header__mobile-link--child {
    padding-left: 24px;
    font-size: 15px;
    color: #4b5563;
}