@import url('https://fonts.googleapis.com/css2?family=Nunito+Sans:wght@300;400;500;700&family=Lato:wght@300;400;700&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

@font-face {
    font-family: 'Metropolis1920';
    src: url('./fonts/metropolis-1920.otf') format('opentype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

/* ========================================
   CSS変数定義
   ======================================== */
:root {
    /* カラー定義 */
    --color-primary: #dc8b68;
    --color-background: #11151c;
    --color-background-dark: #0a0d12;
    --color-white: #FFF;
    --color-black: #000;
    --color-primary-alpha-80: rgba(217, 126, 45, 0.8);
    --color-primary-alpha-70: rgba(217, 126, 45, 0.7);
    --color-primary-alpha-60: rgba(217, 126, 45, 0.6);
    --color-primary-alpha-50: rgba(217, 126, 45, 0.5);
    --color-primary-alpha-30: rgba(217, 126, 45, 0.3);
    --color-primary-alpha-20: rgba(217, 126, 45, 0.2);
    --color-primary-alpha-15: rgba(217, 126, 45, 0.15);
    --color-primary-alpha-10: rgba(217, 126, 45, 0.1);
    --color-primary-alpha-08: rgba(217, 126, 45, 0.08);
    --color-primary-alpha-05: rgba(217, 126, 45, 0.05);
    --color-primary-alpha-03: rgba(217, 126, 45, 0.03);
    
    /* フォントサイズ */
    --font-size-menu-title: 1.8rem;
    --font-size-section-title: 1.6rem;
    --font-size-narrow-section-title: 1.4rem;
    --font-size-feature-title: 1.3rem;
    --font-size-nested-title: 1.1rem;
    --font-size-item-name: 1rem;
    --font-size-dot-title: 0.95rem;
    --font-size-base: 0.9rem;
    --font-size-small: 0.85rem;
    --font-size-xsmall: 0.75rem;
    --font-size-xxsmall: 0.7rem;
    --font-size-tiny: 0.57rem;
    
    /* スペーシング */
    --spacing-xxlarge: 50px;
    --spacing-xlarge: 40px;
    --spacing-large: 30px;
    --spacing-medium: 20px;
    --spacing-normal: 15px;
    --spacing-small: 12px;
    --spacing-xsmall: 10px;
    --spacing-xxsmall: 8px;
    --spacing-tiny: 5px;
    --spacing-xtiny: 4px;
    --spacing-xxtiny: 2px;
    --spacing-xxxtiny: 1px;
    
    /* パディング */
    --padding-page: 30px 45px;
    --padding-page-content: 10px 0px;
    --padding-button: 10px 14px;
    --padding-button-small: 6px 10px;
    --padding-sidebar-header: 18px 22px;
    
    /* ボーダー半径 */
    --radius-circle: 50%;
    --radius-pill: 50px;
    --radius-large: 20px;
    --radius-medium: 8px;
    --radius-small: 4px;
    
    /* その他のサイズ */
    --corner-decoration-size: 70px;
    --language-toggle-size: 50px;
    --language-toggle-position: 60px;
    --sidebar-width: 320px;
    --nav-btn-width: 90px;
    --nav-gap: 40px;
    
    /* トランジション */
    --transition-default: all 0.3s ease;
    --transition-sidebar: right 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    
    /* ボックスシャドウ */
    --shadow-default: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 6px 16px rgba(0, 0, 0, 0.4);
    --shadow-active: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-large: 0 0 20px rgba(0, 0, 0, 0.5);
}

/* ========================================
   リセット・基本スタイル
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Optima", "Hiragino Mincho ProN", "Yu Mincho", "MS PMincho", sans-serif;
    background-color: var(--color-background);
    color: var(--color-primary);
    overflow: hidden;
    touch-action: none;
    user-select: none;
}

/* ========================================
   共通ユーティリティ
   ======================================== */
.list-none {
    list-style-type: none;
}

.clickable {
    cursor: pointer;
    transition: var(--transition-default);
}

.full-size {
    width: 100%;
    height: 100%;
}

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.position-relative {
    position: relative;
}

.position-absolute {
    position: absolute;
}

.position-fixed {
    position: fixed;
}

.text-center {
    text-align: center;
}

.font-bold {
    font-weight: bold;
}

.color-primary {
    color: var(--color-primary);
}

/* 共通マージン */
.mb-30 { margin-bottom: var(--spacing-large); }
.mb-20 { margin-bottom: var(--spacing-medium); }
.mb-15 { margin-bottom: var(--spacing-normal); }
.mb-12 { margin-bottom: var(--spacing-small); }
.mb-10 { margin-bottom: var(--spacing-xsmall); }
.mb-8 { margin-bottom: var(--spacing-xxsmall); }
.mb-5 { margin-bottom: var(--spacing-tiny); }

/* ========================================
   アニメーション関連
   ======================================== */
.myCanvas {
    image-rendering: pixelated;
}

#animation-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    background-color: var(--color-background);
}

#main-content {
    display: none;
}

#animationVideo,
.logo-animation {
    object-fit: cover;
    width: 100%;
    height: 100%;
}

/* ========================================
   スライダー・フリップブック
   ======================================== */
.slider-container {
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
}

#flipbook {
    margin: 10px;
    box-shadow: var(--shadow-large);
    background-color: var(--color-background);
    color: var(--color-primary);
    max-width: 100%;
    position: relative;
}

#flipbook .page,
#flipbook .hard {
    background-color: var(--color-background);
    color: var(--color-primary);
    overflow-y: auto;
    overflow-x: hidden;
    box-sizing: border-box;
    position: relative;
}


/* Scroll indicator for long pages */
.scroll-indicator {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: var(--color-primary-alpha-20);
    color: var(--color-primary);
    padding: 8px 12px;
    border-radius: var(--radius-medium);
    font-size: var(--font-size-xxsmall);
    pointer-events: none;
    opacity: 0.8;
    animation: fadeInOut 3s ease-in-out infinite;
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}

#flipbook .shadow,
#flipbook.shadow {
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.8);
}

#flipbook .odd,
#flipbook .hard.p1,
#flipbook .hard:nth-last-child(2) {
    background-image: linear-gradient(to right, var(--color-background) 95%, var(--color-background-dark) 100%);
}

#flipbook .even,
#flipbook .hard.p2,
#flipbook .hard:last-child {
    background-image: linear-gradient(to left, var(--color-background) 95%, var(--color-background-dark) 100%);
}

/* ========================================
   タイトル・見出し
   ======================================== */
.page-title {
    position: relative;
}

.menu-title {
    font-family: "Metropolis1920", "Hiragino Mincho ProN", "Yu Mincho", "MS PMincho", sans-serif;
    text-align: center;
    padding-bottom: var(--spacing-small);
    margin-bottom: var(--spacing-normal);
    font-size: var(--font-size-menu-title);
    font-weight: 700;
    letter-spacing: 2px;
}

.menu-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 70%;
    height: 3px;
    background: linear-gradient(90deg, transparent 0%, var(--color-primary) 50%, transparent 100%);
}

.section-title {
    font-size: var(--font-size-section-title);
    font-weight: 500;
    margin-bottom: var(--spacing-normal);
    padding-bottom: var(--spacing-xxsmall);
    border-bottom: 2px solid var(--color-primary);
}

.section-title.narrow-title {
    margin-bottom: var(--spacing-xsmall);
    font-size: var(--font-size-narrow-section-title);
    padding-bottom: var(--spacing-tiny);
}

.section-title.decorated-title,
.decorated-title {
    border-bottom: none;
    padding-left: 25px;
    position: relative;
    font-size: var(--font-size-section-title);
    margin-bottom: var(--spacing-medium);
    padding-bottom: 0;
}

.decorated-title:before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background-color: var(--color-primary);
    border-radius: var(--radius-circle);
}

.dot-title,
.category-title {
    font-size: var(--font-size-dot-title);
    font-weight: 600;
    margin-bottom: var(--spacing-tiny);
    position: relative;
}

.nested-title {
    font-size: var(--font-size-nested-title);
    font-weight: bold;
    margin-bottom: var(--spacing-tiny);
    color: var(--color-primary);
}

/* ========================================
   メニューアイテム
   ======================================== */
.menu-item {
    margin-bottom: var(--spacing-small);
}

.item-name,
.item-header {
    font-weight: 500;
    display: flex;
    justify-content: space-between;
}

.item-header.category-header {
    margin-bottom: var(--spacing-xxsmall);
}

.item-price {
    font-weight: 400;
}

.item-desc {
    font-size: var(--font-size-xsmall);
}

.item-title {
    font-weight: 700;
    font-size: var(--font-size-base);
}

.item-description {
    font-size: var(--font-size-xxsmall);
    display: inline-block;
    margin-top: 2px;
}

/* 日本語のドリンク名は常に表示 */
.item-name-ja {
    display: block !important;
    font-size: var(--font-size-small);
    margin-bottom: var(--spacing-xtiny);
    opacity: 0.9;
}

/* ========================================
   フレーバー・オプション
   ======================================== */
.flavor-title,
.option-name {
    font-weight: 500;
    margin-bottom: var(--spacing-xtiny);
    color: var(--color-primary);
}

.menu-sections,
.menu-section,
.shop-info,
.feature-grid {
    margin-bottom: var(--spacing-normal);
}

.menu-section.narrow-section {
    margin-bottom: var(--spacing-tiny);
}

.hard-section,
.nested-list li,
.contact-info div {
    margin-bottom: var(--spacing-xtiny);
}

.menu-list {
    list-style-type: none;
}

.menu-list.flex-list {
    flex-wrap: wrap;
    gap: var(--spacing-xxsmall);
    /* padding-bottom: var(--spacing-normal); */
}

.menu-list.classic-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
}

.menu-list.classic-list .menu-item {
    font-size: var(--font-size-xsmall);
    margin-bottom: var(--spacing-tiny);
    position: relative;
    padding-left: var(--spacing-normal);
}

.menu-list.classic-list .menu-item:before,
.system-list li:before {
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

/* CLASSICセクション専用の2列表示スタイル */
.menu-list.classic-detail-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}

.option-item {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-dot-title);
    padding: var(--padding-button-small);
    border-radius: var(--radius-medium);
}

.option-price {
    color: var(--color-primary);
}

/* ========================================
   ナビゲーション
   ======================================== */
.navigation {
    position: fixed;
    bottom: var(--spacing-large);
    left: 0;
    right: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    gap: var(--nav-gap);
    z-index: 99999;
}

.nav-btn {
    display: block;
    width: var(--nav-btn-width);
    padding: 12px 0;
    background-color: var(--color-primary);
    color: var(--color-black);
    text-align: center;
    font-weight: bold;
    font-size: 14px;
    border-radius: var(--radius-pill);
    cursor: pointer;
    box-shadow: var(--shadow-default);
    border: 2px solid var(--color-white);
    transition: var(--transition-default);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    appearance: none;
    outline: none;
}

.nav-btn:hover,
.nav-btn:active,
.nav-btn:focus {
    background-color: var(--color-white);
    color: var(--color-primary);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.5);
    outline: none;
    transform: translateY(-3px);
}

.nav-btn:active {
    transform: translateY(1px);
    box-shadow: var(--shadow-active);
}

/* ========================================
   タブ
   ======================================== */
.tab-buttons {
    display: flex;
    margin-bottom: var(--spacing-normal);
    overflow-x: auto;
    padding-bottom: var(--spacing-xtiny);
    -webkit-overflow-scrolling: touch;
}

.tab-btn {
    padding: var(--padding-button-small);
    background-color: var(--color-primary-alpha-20);
    border: none;
    border-radius: var(--radius-large);
    margin-right: var(--spacing-xxsmall);
    cursor: pointer;
    white-space: nowrap;
    font-size: var(--font-size-small);
    color: var(--color-primary);
}

.tab-btn.active {
    background-color: var(--color-primary);
    color: var(--color-background);
}

.tab-content {
    display: none;
    position: relative;
}

.tab-content.active {
    display: block;
}

/* ========================================
   装飾要素
   ======================================== */
.corner-decoration,
.border-decoration {
    position: absolute;
    z-index: 10;
    pointer-events: none;
}

.corner-decoration {
    width: var(--corner-decoration-size);
    height: var(--corner-decoration-size);
}

.border-decoration {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

.top-left-decoration,
.top-right-decoration,
.bottom-right-decoration,
.bottom-left-decoration {
    position: absolute;
}

.top-left-decoration { top: 10px; left: 10px; }
.top-right-decoration { top: 10px; right: 10px; }
.bottom-right-decoration { bottom: 10px; right: 10px; }
.bottom-left-decoration { bottom: 10px; left: 10px; }

/* ========================================
   レイアウト・グリッド
   ======================================== */
.grid-menu,
.two-column {
    display: grid;
    gap: var(--spacing-xsmall);
}

.grid-menu {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-normal);
}

.two-column {
    grid-template-columns: repeat(2, 1fr);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xsmall);
}

.feature-item {
    background-color: var(--color-primary-alpha-08);
    border: 1px solid var(--color-primary-alpha-20);
    border-radius: var(--radius-medium);
    padding: var(--spacing-normal);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-title {
    font-size: var(--font-size-feature-title);
    font-weight: 500;
    margin-bottom: var(--spacing-xsmall);
    text-align: center;
    letter-spacing: 1px;
}

.feature-desc {
    font-size: var(--font-size-dot-title);
    line-height: 1.5;
    color: var(--color-primary);
}

/* ========================================
   ページコンテンツ
   ======================================== */
.page-content {
    position: relative;
    padding: var(--padding-page-content);
    height: 100%;
    overflow: hidden;
    font-size: var(--font-size-base);
}

/* page-titleがないページ用の上部パディング */
.page-content.no-page-title {
    padding-top: 30px;
}

/* section-titleがないページ用の上部パディング */
.page-content.no-page-title.no-section-title {
    padding-top: 60px;
}

.page-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle at 20% 30%, var(--color-primary-alpha-05) 0%, transparent 70%),
                      radial-gradient(circle at 80% 70%, var(--color-primary-alpha-05) 0%, transparent 70%);
    z-index: -1;
}

.divider {
    height: 3px;
    background: linear-gradient(90deg, transparent 0%, var(--color-primary-alpha-50) 50%, transparent 100%);
    margin: var(--spacing-large) 0;
}

/* ========================================
   システム情報・連絡先
   ======================================== */
.system-info {
    background-color: var(--color-primary-alpha-10);
    padding: var(--spacing-small);
    border-radius: var(--radius-medium);
    margin-bottom: var(--spacing-normal);
    border-left: 4px solid var(--color-primary);
}

.system-desc,
.menu-desc {
    margin-bottom: var(--spacing-xsmall);
    line-height: 1.5;
}

.system-list {
    list-style-type: none;
}

.menu-note {
    font-size: var(--font-size-xxsmall);
}

.nested-list {
    list-style-type: none;
    padding-left: var(--spacing-xxsmall);
}

.system-list {
    font-size: var(--font-size-small);
}

.system-list li {
    position: relative;
    padding-left: var(--spacing-tiny);
    margin-bottom: var(--spacing-tiny);
    line-height: 1.4;
}

.system-list li:before {
    top: -2px;
    font-size: 1.3rem;
}

.contact-info {
    margin-top: auto;
    padding-top: var(--spacing-normal);
    font-size: var(--font-size-small);
    color: var(--color-primary-alpha-70);
}

/* ========================================
   ショップ情報
   ======================================== */
.shop-info-item {
    display: flex;
    align-items: baseline;
    padding: var(--spacing-tiny);
}

.shop-info-label {
    margin-right: var(--spacing-small);
    min-width: 80px;
}

/* 営業時間の2行表示用スタイル */
.shop-hours {
    align-items: flex-start;
}

.shop-hours .hours-container {
    display: flex;
    flex-direction: column;
}

.hours-line {
    display: flex;
    align-items: center;
}

.hours-line .ja,
.hours-line .en {
    min-width: 60px;
}

/* ========================================
   ソーシャルリンク・マップリンク
   ======================================== */
.contact-link,
.social-link,
.map-link,
a[href^="tel:"] {
    color: var(--color-primary);
    text-decoration: underline;
    display: inline-flex;
    align-items: center;
    transition: var(--transition-default);
    border-radius: var(--radius-small);
    position: relative;
    overflow: hidden;
}

/* .social-link:hover,
.map-link:hover {
    color: var(--color-background);
    background-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--color-primary-alpha-30);
}

.social-link:active,
.map-link:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px var(--color-primary-alpha-30);
}

.social-icon,
.map-icon {
    margin-right: var(--spacing-xxsmall);
    font-size: 1.1em;
    transition: var(--transition-default);
}

.social-link:hover .social-icon,
.map-link:hover .map-icon {
    transform: scale(1.1);
}

.instagram-link:hover {
    background: linear-gradient(45deg, #f09433 0%,#e6683c 25%,#dc2743 50%,#cc2366 75%,#bc1888 100%);
}

.instagram-link:hover .social-icon {
    animation: bounce 0.6s ease-in-out;
}

.map-link:hover .map-icon {
    animation: pulse 0.6s ease-in-out;
} */

@keyframes bounce {
    0%, 100% { transform: scale(1.1); }
    50% { transform: scale(1.3); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1.1); }
    50% { transform: scale(1.2); }
}

/* Focus states for accessibility */
/* .social-link:focus,
.map-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
} */

/* ========================================
   ロゴ・SVG
   ======================================== */
.logo-container {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.logo-part {
    opacity: 0;
    transform-origin: center center;
    will-change: transform, opacity;
}

/* ========================================
   セクション
   ======================================== */
.section {
    margin-bottom: 1.5em;
}

/* ========================================
   ドリンク・フード
   ======================================== */
.nested-item {
    margin-bottom: var(--spacing-xtiny);
}

.drink-item {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-xsmall);
}


/* メニュー詳細アイテム共通スタイル（シーシャフレーバー、フード、シグネチャーカクテル統一） */
.menu-detail-item {
    margin-bottom: var(--spacing-normal);
}

.menu-detail-item.system-item {
    margin-bottom: var(--spacing-xxsmall);
}

.menu-detail-item.classic-detail-item {
    margin-bottom: var(--spacing-tiny);
}

.menu-detail-item .item-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xtiny);
}

.menu-detail-item .item-name {
    font-size: var(--font-size-small);
    font-weight: 500;
}

.menu-detail-item .item-name.classic-name {
    font-size: var(--font-size-xsmall);
}

.menu-detail-item .item-price {
    font-size: var(--font-size-small);
}

.menu-detail-item .item-name-ja {
    display: block;
    font-size: var(--font-size-xsmall);
    margin-bottom: var(--spacing-tiny);
    opacity: 0.9;
}

.menu-detail-item .item-name-ja.classic-name-ja {
    font-size: var(--font-size-tiny);
    margin-bottom: var(--spacing-xxxtiny);
}

.menu-detail-item .item-desc-en {
    display: block;
    font-size: var(--font-size-xsmall);
    font-weight: 500;
    margin-bottom: var(--spacing-xtiny);
}

.menu-detail-item .item-desc-ja {
    display: block;
    font-size: var(--font-size-xxsmall);
    opacity: 0.85;
}


.nested-list {
    font-size: var(--font-size-xsmall);
}

/* ========================================
   その他
   ======================================== */
.continued-title {
    position: relative;
}

.continued {
    font-size: var(--font-size-nested-title);
    color: var(--color-primary-alpha-60);
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    right: 0;
}

/* ========================================
   言語切り替えボタン・サイドバー
   ======================================== */
.language-toggle-btn {
    position: fixed;
    top: var(--language-toggle-position);
    right: var(--language-toggle-position);
    width: var(--language-toggle-size);
    height: var(--language-toggle-size);
    background-color: transparent;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-circle);
    cursor: pointer;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-default);
    box-shadow: var(--shadow-default);
    backdrop-filter: blur(10px);
}

.language-toggle-btn:hover {
    background-color: var(--color-primary);
    transform: scale(1.1);
    box-shadow: var(--shadow-hover);
}

.menu-icon {
    position: relative;
    width: 24px;
    height: 18px;
}

.menu-icon span {
    display: block;
    position: absolute;
    height: 3px;
    width: 100%;
    background: var(--color-primary);
    border-radius: 2px;
    transition: var(--transition-default);
}

.menu-icon span:nth-child(1) { top: 0px; }
.menu-icon span:nth-child(2) { top: 5px; }
.menu-icon span:nth-child(3) { top: 10px; }
.menu-icon span:nth-child(4) { top: 15px; }

.language-sidebar {
    position: fixed;
    top: 0;
    right: calc(-1 * var(--sidebar-width));
    width: var(--sidebar-width);
    height: 100vh; /* fallback for older browsers */
    height: 100dvh; /* dynamic viewport height for modern browsers */
    background-color: rgba(17, 21, 28, 0.95);
    backdrop-filter: blur(20px);
    border-left: 2px solid var(--color-primary-alpha-30);
    z-index: 1001;
    transition: var(--transition-sidebar);
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.5);
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch; /* スムーズスクロール for iOS */
    overscroll-behavior-y: contain; /* ラバーバンド効果の制御 */
}

.language-sidebar.open {
    right: 0;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--padding-sidebar-header);
    border-bottom: 1px solid var(--color-primary-alpha-20);
}

.sidebar-header h3 {
    color: var(--color-primary);
    font-size: 1.2rem;
    font-weight: 500;
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 2rem;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-circle);
    transition: var(--transition-default);
}

.close-btn:hover {
    background-color: var(--color-primary-alpha-20);
    transform: rotate(90deg);
}

.sidebar-content {
    padding: var(--spacing-medium);
    padding-bottom: 60px; /* URLバー分の余裕を確保 */
    padding-bottom: calc(60px + env(safe-area-inset-bottom, 0)); /* 安全領域への対応 */
}

.language-selection {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xsmall);
    margin-bottom: var(--spacing-large);
}

.language-option,
.nav-item,
.nav-subitem {
    cursor: pointer;
    transition: var(--transition-default);
}

.language-option {
    padding: var(--padding-button);
    background-color: var(--color-primary-alpha-10);
    border: 2px solid var(--color-primary-alpha-20);
    border-radius: var(--radius-medium);
    font-size: 0.9rem;
    color: var(--color-primary);
    text-align: center;
    font-weight: 500;
}

.language-option:hover {
    background-color: var(--color-primary-alpha-20);
    border-color: var(--color-primary-alpha-50);
}

.language-option.active {
    background-color: var(--color-primary);
    color: var(--color-background);
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px var(--color-primary-alpha-30);
}

.navigation-menu {
    margin-top: var(--spacing-medium);
}

.nav-section {
    margin-bottom: 18px;
}

.nav-section-title {
    font-size: var(--font-size-nested-title);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xsmall);
    padding-bottom: var(--spacing-tiny);
    border-bottom: 1px solid var(--color-primary-alpha-30);
}

.nav-item {
    display: block;
    width: 100%;
    padding: var(--padding-button);
    margin-bottom: var(--spacing-xxsmall);
    background-color: var(--color-primary-alpha-05);
    border: 1px solid var(--color-primary-alpha-20);
    border-radius: 6px;
    font-size: var(--font-size-dot-title);
    color: var(--color-primary);
    text-align: left;
}

.nav-item:hover {
    background-color: var(--color-primary-alpha-15);
    border-color: rgba(217, 126, 45, 0.4);
    transform: translateX(3px);
}

.nav-subsection {
    margin-left: var(--spacing-normal);
    margin-top: var(--spacing-tiny);
}

.nav-subitem {
    display: block;
    width: 100%;
    padding: var(--padding-button-small);
    margin-bottom: var(--spacing-tiny);
    background-color: var(--color-primary-alpha-03);
    border: 1px solid var(--color-primary-alpha-10);
    border-radius: var(--radius-small);
    font-size: var(--font-size-small);
    color: var(--color-primary-alpha-80);
    text-align: left;
}

.nav-subitem:hover {
    background-color: var(--color-primary-alpha-10);
    border-color: var(--color-primary-alpha-30);
    color: var(--color-primary);
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-default);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   レスポンシブデザイン - モバイル (max-width: 768px)
   ======================================== */
@media (max-width: 768px) {
    :root {
        /* フォントサイズ調整 */
        --font-size-menu-title: 1.2rem;
        --font-size-section-title: 1.05rem;
        --font-size-narrow-section-title: 1rem;
        --font-size-feature-title: 1.05rem;
        --font-size-xsmall: 0.75rem;
        
        /* レイアウト調整 */
        --padding-page: 25px 40px;
        --language-toggle-size: 40px;
        --language-toggle-position: 40px;
        --sidebar-width: 280px;
    }
    
    /* グリッドレイアウト調整 */
    /* .grid-menu,
    .feature-grid,
    .menu-list.classic-detail-list {
        grid-template-columns: 1fr;
    } */
    
    /* ページパディング */
    #flipbook .page,
    #flipbook .hard {
        padding: var(--padding-page);
    }
    
    /* フォントサイズ調整 */
    .menu-list.flex-list {
        font-size: var(--font-size-xsmall);
    }
    
    .system-list li {
        font-size: var(--font-size-xxsmall);
    }

    .page-title .menu-title {
        font-size: 1.5rem;
    }
    
    .feature-title {
        margin-bottom: var(--spacing-tiny);
    }
    
    .system-section h3.section-title,
    .decorated-title {
        font-size: 1.4rem;
    }
    
    .feature-desc,
    .food-desc,
    .system-desc,
    .menu-desc,
    .shop-info-item {
        font-size: var(--font-size-xsmall);
    }
    
    /* 言語切り替えメニュー調整 */
    .menu-icon {
        width: 20px;
        height: 15px;
    }
    
    .menu-icon span {
        height: 2px;
    }
    
    .menu-icon span:nth-child(1) { top: 0px; }
    .menu-icon span:nth-child(2) { top: 4px; }
    .menu-icon span:nth-child(3) { top: 8px; }
    .menu-icon span:nth-child(4) { top: 12px; }
    
    .sidebar-header {
        padding: 20px 25px;
    }
    
    .sidebar-header h3 {
        font-size: 1.2rem;
    }
    
    .sidebar-content {
        padding: 25px;
    }
    
    .language-option {
        font-size: 1rem;
    }
    
    .language-option .flag {
        font-size: 1.5rem;
        margin-right: 12px;
    }
}

/* ========================================
   レスポンシブデザイン - タブレット (特殊サイズ)
   ======================================== */
@media (min-width: 1024px) and (max-width: 2200px) and (min-height: 1600px) {
    :root {
        /* フォントサイズ調整 */
        --font-size-menu-title: 2.2rem;
        --font-size-section-title: 1.8rem;
        --font-size-item-name: 1.3rem;
        --font-size-flavor-title: 1.3rem;
        --font-size-option-item: 1.3rem;
        --font-size-tab-btn: 1.1rem;
        --font-size-system-info: 1.1rem;
        
        /* レイアウト調整 */
        --padding-page: 35px 50px;
        --spacing-large: 50px;
        --nav-gap: 80px;
        --nav-btn-width: 130px;
        --language-toggle-size: 60px;
        --sidebar-width: 360px;
    }
    
    /* フリップブック調整 */
    #flipbook {
        max-width: 90%;
    }
    
    #flipbook .page,
    #flipbook .hard {
        padding: var(--padding-page);
    }
    
    /* タイトル調整 */
    .menu-title {
        margin-bottom: 35px;
    }
    
    .section-title {
        margin-bottom: 25px;
    }
    
    /* アイテム調整 */
    .item-name {
        font-size: var(--font-size-item-name);
        margin-bottom: var(--spacing-xxsmall);
    }
    
    .item-desc {
        font-size: 1.1rem;
    }
    
    .flavor-title {
        font-size: var(--font-size-flavor-title);
        margin-bottom: var(--spacing-small);
    }
    
    .flavor-item {
        font-size: 1.1rem;
        padding: 6px 12px;
        border-radius: 6px;
    }
    
    .option-item {
        font-size: var(--font-size-option-item);
        margin-bottom: var(--spacing-small);
    }
    
    /* タブ調整 */
    .tab-btn {
        padding: 12px 20px;
        font-size: var(--font-size-tab-btn);
        border-radius: 30px;
        margin-right: var(--spacing-small);
    }
    
    .tab-buttons {
        margin-bottom: var(--spacing-medium);
    }
    
    /* グリッド調整 */
    .grid-menu {
        gap: 25px;
    }
    
    .grid-menu .menu-item {
        margin-bottom: var(--spacing-normal);
    }
    
    .menu-list.flex-list {
        gap: var(--spacing-small);
    }
    
    /* ナビゲーション調整 */
    .nav-btn {
        padding: 18px 0;
        font-size: 1.1rem;
        border-radius: 60px;
    }
    
    /* システム情報調整 */
    .system-info,
    .contact-info {
        font-size: var(--font-size-system-info);
        margin-bottom: 25px;
    }
    
    /* 言語切り替えメニュー調整 */
    .menu-icon {
        width: 28px;
        height: 21px;
    }
    
    .menu-icon span {
        height: 4px;
    }
    
    .menu-icon span:nth-child(1) { top: 0px; }
    .menu-icon span:nth-child(2) { top: 6px; }
    .menu-icon span:nth-child(3) { top: 12px; }
    .menu-icon span:nth-child(4) { top: 18px; }
    
    .sidebar-header {
        padding: 35px 40px;
    }
    
    .sidebar-header h3 {
        font-size: 1.6rem;
    }
    
    .close-btn {
        font-size: 2.5rem;
        width: 50px;
        height: 50px;
    }
    
    .sidebar-content {
        padding: 40px;
    }
    
    .language-option {
        padding: 25px 30px;
        margin-bottom: var(--spacing-medium);
        font-size: 1.3rem;
        border-radius: 15px;
    }
    
    .language-option .flag {
        font-size: 2.5rem;
        margin-right: var(--spacing-medium);
    }
}