/* ============================================
   CAR DREAM ベーススタイル
   ============================================ */

/* CSS変数定義 */
:root {
    /* カラーパレット */
    --color-primary: #c30d22;
    --color-primary-dark: #B0122E;
    --color-primary-light: #FF1744;
    --color-secondary: #FFA500;
    --color-secondary-dark: #FF8C00;
    --color-text: #1A1A1A;
    --color-text-light: #4A4A4A;
    --color-text-lighter: #999999;
    --color-bg: #FFFFFF;
    --color-bg-light: #F8F8F8;
    --color-bg-dark: #1A1A1A;
    --color-border: #E0E0E0;
    --color-bg-light-staff: #D8D8D8;
    
    /* タイポグラフィ */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    --font-family-en: 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-h1: 56px;
    --font-size-h2: 42px;
    --font-size-h3: 32px;
    --font-size-h4: 24px;
    --line-height-base: 1.7;
    --line-height-heading: 1.3;
    
    /* スペーシング */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 80px;
    
    /* レイアウト */
    --container-max-width: 1200px;
    --container-padding: 20px;
    
    /* トランジション */
    --transition-base: 0.3s ease;
    --transition-fast: 0.15s ease;
    --transition-slow: 0.6s ease;
    
    /* シャドウ */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
}

/* リセット */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* タイポグラフィ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-h1);
}

h2 {
    font-size: var(--font-size-h2);
}

h3 {
    font-size: var(--font-size-h3);
}

h4 {
    font-size: var(--font-size-h4);
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--color-primary-dark);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

/* コンテナ */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ボタン */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: center;
    border: 2px solid transparent;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    letter-spacing: 1px;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
    box-shadow: 0 4px 15px rgba(195, 13, 34, 0.3);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-bg);
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(195, 13, 34, 0.4);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-bg);
    border-color: var(--color-secondary);
    box-shadow: 0 4px 15px rgba(255, 165, 0, 0.3);
}

.btn-secondary:hover {
    background-color: var(--color-secondary-dark);
    border-color: var(--color-secondary-dark);
    color: var(--color-bg);
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(255, 165, 0, 0.4);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: var(--color-bg);
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(195, 13, 34, 0.3);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-large);
}

.btn-divider {
    margin: 0 var(--spacing-md);
    color: var(--color-text-lighter);
    font-weight: 400;
}

/* セクション */
section {
    padding: var(--spacing-xxl) 0;
}

.section-title {
    text-align: center;
    font-size: var(--font-size-h2);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

/* ヘッダー */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0);
    backdrop-filter: blur(0px);
    box-shadow: none;
    z-index: 1000;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.site-header.scrolled {
    /* スクロール時のヘッダー背景をテーマ赤にする */
    background-color: rgba(195, 13, 34, 0.95);
    backdrop-filter: blur(8px);
    box-shadow: 0 2px 20px rgba(195, 13, 34, 0.3);
}

.site-header.is-dark {
    background-color: rgba(195, 13, 34, 0.95);
}

.site-header.is-dark.scrolled {
    background-color: rgba(195, 13, 34, 0.98);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    position: relative;
}

.logo a {
    font-size: var(--font-size-h4);
    font-weight: 700;
    font-family: var(--font-family-en);
    letter-spacing: 2px;
    color: var(--color-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    z-index: 1001;
}

.logo-img {
    height: 40px;
    width: auto;
    display: block;
    transition: filter 0.3s ease;
}

.site-header.is-dark .logo-img,
.site-header:not(.scrolled) .logo-img {
    /* スクロール時にロゴが反転する挙動は不要なため、常に通常表示にする */
    filter: none;
}

.site-header.scrolled:not(.is-dark) .logo-img {
    filter: none;
}

.main-nav {
    display: flex;
}

.nav-list {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-list a {
    color: var(--color-text);
    font-weight: 500;
    font-size: var(--font-size-small);
    padding: var(--spacing-xs) var(--spacing-sm);
    position: relative;
    transition: color 0.3s ease;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.site-header:not(.scrolled) .nav-list a,
.site-header.is-dark .nav-list a {
    /* 暗背景時にメニューが白へ反転して見えるのを避け、透過グレーにする */
    color: rgba(255, 255, 255, 0.95);
}

.site-header.scrolled:not(.is-dark) .nav-list a {
    /* スクロール時のメニュー文字色 */
    color: rgba(255, 255, 255, 0.95);
}

.site-header:not(.scrolled) .nav-list a.active,
.site-header.is-dark .nav-list a.active {
    color: rgba(255, 255, 255, 1);
}

.site-header.scrolled:not(.is-dark) .nav-list a.active,
.site-header.scrolled:not(.is-dark) .nav-list a:hover {
    color: rgba(255, 255, 255, 1);
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: calc(100% - var(--spacing-sm) * 2);
    height: 2px;
    background-color: rgba(255, 255, 255, 0.9);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-list a:hover::after,
.nav-list a.active::after {
    transform: translateX(-50%) scaleX(1);
}

.nav-list a:hover,
.nav-list a.active {
    color: rgba(255, 255, 255, 1);
}

.site-header:not(.scrolled) .nav-list a:hover,
.site-header.is-dark .nav-list a:hover {
    /* hoverでも真っ白にせず、少しだけ明るい透過グレーにする */
    color: rgba(255, 255, 255, 1);
}

/* モバイルメニューボタン */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    position: relative;
}

.mobile-menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}

.site-header:not(.scrolled) .mobile-menu-toggle span,
.site-header.is-dark .mobile-menu-toggle span {
    /* 暗背景時にハンバーガーアイコンが白へ反転して見えるのを避ける */
    background-color: rgba(255, 255, 255, 0.95);
}

.site-header.scrolled:not(.is-dark) .mobile-menu-toggle span {
    background-color: rgba(255, 255, 255, 0.95);
}

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

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

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

/* モバイルメニュー（オフキャンバス） */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background-color: rgba(195, 13, 34, 0.98);
    backdrop-filter: blur(20px);
    z-index: 1000;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    padding: calc(var(--spacing-xxl) + 60px) var(--spacing-xl) var(--spacing-xl);
    overflow-y: auto;
}

.mobile-nav.is-open {
    right: 0;
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.mobile-nav-list a {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-large);
    font-weight: 500;
    padding: var(--spacing-md) 0;
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    transition: color 0.3s ease, transform 0.3s ease;
}

.mobile-nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: rgba(255, 255, 255, 0.9);
    transition: width 0.3s ease;
}

.mobile-nav-list a:hover,
.mobile-nav-list a.active {
    color: rgba(255, 255, 255, 1);
    transform: translateX(10px);
}

.mobile-nav-list a:hover::after,
.mobile-nav-list a.active::after {
    width: 100%;
}

.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-nav-overlay.is-active {
    opacity: 1;
    visibility: visible;
}

/* フッター */
.site-footer {
    background-color: var(--color-primary);
    color: var(--color-bg);
    padding: calc(var(--spacing-xxl) * 1.2) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xxl);
    margin-bottom: var(--spacing-xxl);
}

.footer-info {
    display: flex;
    flex-direction: column;
}

.footer-logo {
    font-size: var(--font-size-h3);
    font-family: var(--font-family-en);
    letter-spacing: 2px;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.footer-logo-img {
    height: 50px;
    width: auto;
    display: block;
    filter: none;
    opacity: 0.9;
}

.footer-company-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-address,
.footer-tel,
.footer-hours {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-small);
    line-height: 1.5;
    margin: 0;
}

.footer-sitemap,
.footer-links {
    display: flex;
    flex-direction: column;
}

.footer-section-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-md);
    letter-spacing: 1px;
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
}

.footer-nav ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-nav a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-base);
    font-size: var(--font-size-small);
    letter-spacing: 0.5px;
    text-decoration: none;
}

.footer-nav a:hover {
    color: var(--color-bg);
    padding-left: var(--spacing-xs);
}

.footer-link-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-link-stock {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    text-decoration: none;
    transition: opacity var(--transition-base);
}

.footer-link-stock:hover {
    opacity: 0.8;
}

.link-label {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 0.5px;
}

.link-image {
    max-width: 150px;
    height: auto;
    display: block;
}

.footer-social {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: rgba(255, 255, 255, 0.7);
    transition: all var(--transition-base);
    font-size: var(--font-size-small);
    padding: var(--spacing-sm) 0;
    text-decoration: none;
}

.social-link svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.social-link:hover {
    color: rgba(255, 255, 255, 1);
    transform: translateY(-2px);
}

.social-link:hover svg {
    transform: scale(1.1);
}

.footer-copyright {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-small);
    letter-spacing: 0.5px;
}

/* アニメーション用クラス */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* アクセシビリティ: アニメーション無効化対応 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .fade-in,
    .slide-in-left,
    .slide-in-right {
        opacity: 1;
        transform: none;
    }
}

/* フォーカス可視化 */
/* マウスクリック時はアウトラインを非表示、キーボード操作時のみ表示 */
a:focus {
    outline: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

.mobile-menu-toggle:focus {
    outline: none;
}

.mobile-menu-toggle:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* レスポンシブ */
@media (max-width: 768px) {
    :root {
        --font-size-h1: 36px;
        --font-size-h2: 28px;
        --font-size-h3: 24px;
        --font-size-h4: 20px;
        --spacing-xxl: 48px;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        display: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-info,
    .footer-sitemap,
    .footer-links {
        text-align: left;
    }
    
    .footer-social {
        flex-direction: row;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-h1: 28px;
        --font-size-h2: 24px;
        --font-size-h3: 20px;
        --container-padding: 16px;
    }
    
    .btn-large {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
    
    .btn-divider {
        display: block;
        margin: var(--spacing-xs) 0;
    }
}