/* ========================================
   Header - ヘッダー
======================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--color-bg);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.site-header.is-scrolled {
    box-shadow: var(--shadow-md);
}

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

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========================================
   ロゴ
======================================== */
.site-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.site-logo .logo-link {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.site-logo .logo-image {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.site-logo .logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.site-logo .logo-text-top,
.site-logo .logo-text-bottom {
    display: block;
    color: var(--color-corporate);
}

.site-logo .logo-text-top {
    font-family: var(--font-en);
    font-size: 1.0rem;
    font-weight: 400;
    letter-spacing: 0.15em;
}

.site-logo .logo-text-bottom {
    font-family: var(--font-en);
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: 0.08em;
}

/* ========================================
   メインナビゲーション
======================================== */
.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-lg);
}

.main-nav {
    margin-left: auto;
}

.main-nav li {
    position: relative;
}

.main-nav > ul > li > a {
    display: block;
    padding: var(--spacing-sm) 0;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    transition: color 0.2s ease;
}

.main-nav > ul > li > a:hover,
.main-nav > ul > li.current-menu-item > a {
    color: var(--color-corporate);
}

/* ========================================
   ドロップダウンメニュー
======================================== */
.main-nav .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--color-bg);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 100;
}

.main-nav li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.main-nav .sub-menu li {
    margin: 0;
}

.main-nav .sub-menu a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1.4rem;
    color: var(--color-text);
    transition: var(--transition);
}

.main-nav .sub-menu a:hover {
    background-color: var(--color-bg-light);
    color: var(--color-primary);
}

/* ========================================
   ハンバーガーメニュー
======================================== */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition);
    transform-origin: center;
}

.menu-toggle.is-active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-toggle.is-active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.is-active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ========================================
   ヘッダーアクション
======================================== */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-left: var(--spacing-lg);
}

/* ヘッダーCTA */
.header-cta {
    display: inline-block;
    padding: 10px 24px;
    font-size: 1.3rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    border: 1px solid;
    transition: all 0.3s ease;
}

.header-cta:hover {
    background-color: var(--color-corporate);
    border-color: var(--color-corporate);
    color: #fff;
}

.header-tel {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
}

.header-tel-icon {
    font-size: 2rem;
}

.header-tel-label {
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--color-text-light);
}

/* ========================================
   透明ヘッダー（トップページ用）
======================================== */
.header-transparent {
    background-color: transparent;
    box-shadow: none;
}

/* 透明ヘッダー */
.site-header-transparent {
    background-color: transparent;
    box-shadow: none;
    transition: background-color 0.4s ease, box-shadow 0.4s ease;
}

.site-header-transparent .main-nav > ul > li > a {
    color: #fff;
}

.site-header-transparent .menu-toggle span {
    background-color: #f7f7f7;
}

.site-header-transparent .header-cta {
    border-color: #fff;
    color: #fff;
}

.site-header-transparent.is-scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.1);
}

.site-header-transparent.is-scrolled .main-nav > ul > li > a {
    color: var(--color-dark);
}

.site-header-transparent.is-scrolled .menu-toggle span {
    background-color: var(--color-dark);
}

.site-header-transparent.is-scrolled .header-cta {
    border-color: var(--color-dark);
    color: var(--color-dark);
}

.header-transparent .main-nav > ul > li > a,
.header-transparent .site-logo a {
    color: #fff;
}

.header-transparent .menu-toggle span {
    background-color: #fff;
}

.header-transparent.is-scrolled {
    background-color: var(--color-bg);
    box-shadow: var(--shadow-md);
}

.header-transparent.is-scrolled .main-nav > ul > li > a,
.header-transparent.is-scrolled .site-logo a {
    color: var(--color-text);
}

.header-transparent.is-scrolled .menu-toggle span {
    background-color: var(--color-text);
}