/* ============================================
   刀剣ミュージアム東京 - スタイルシート
   ============================================ */

/* ----- CSS カスタムプロパティ（変数） ----- */
:root {
  /* カラーパレット */
  --color-bg-main: #0a0e1a;
  --color-bg-card: #1a1f2e;
  --color-bg-header: rgba(10, 14, 26, 0.92);
  --color-bg-footer: #060810;
  --color-accent: #c5a55a;
  --color-accent-light: #d4ba7a;
  --color-accent-dark: #9e833e;
  --color-text-primary: #ffffff;
  --color-text-secondary: #b0b0b0;
  --color-text-muted: #6b7280;
  --color-border: rgba(197, 165, 90, 0.2);
  --color-border-light: rgba(255, 255, 255, 0.08);
  --color-error: #ef4444;
  --color-success: #4ade80;

  /* フォント */
  --font-serif: 'Noto Serif JP', '游明朝', 'Yu Mincho', serif;
  --font-sans: 'Noto Sans JP', '游ゴシック', 'Yu Gothic', sans-serif;

  /* スペーシング */
  --section-padding: 100px 0;
  --container-width: 1200px;

  /* トランジション */
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
}

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

html {
  /* scroll-behaviorはGSAP ScrollToPluginで制御するためCSSでは指定しない */
  scroll-padding-top: 80px;
  font-size: 16px;
  /* スクロールバーによるレイアウトシフト防止 */
  scrollbar-gutter: stable;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-text-primary);
  background-color: var(--color-bg-main);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--color-accent);
}

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

ul, ol {
  list-style: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
}

/* ============================================
   共通コンポーネント
   ============================================ */

/* ----- コンテナ（レイアウトユーティリティ） ----- */
.container {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ----- スキップリンク（アクセシビリティ） ----- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 10000;
  padding: 12px 24px;
  background: var(--color-accent);
  color: var(--color-bg-main);
  font-weight: 600;
  border-radius: 0 0 6px 6px;
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 0;
  color: var(--color-bg-main);
}

/* ----- セクション見出し ----- */
.section-heading {
  text-align: center;
  margin-bottom: 60px;
}

.section-heading__en {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.section-heading__ja {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-text-primary);
  margin-bottom: 16px;
}

.section-heading__line {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  margin: 0 auto;
}

/* ----- スクロールフェードアニメーション（GSAPで制御） ----- */
.js-scroll-fade {
  opacity: 0;
  transform: translateY(30px);
}

/* ----- JS未読込時・GSAP未発火時の安全策 ----- */
/* noscript 環境やCDN障害時にコンテンツが見えないままになるのを防止 */
@media (scripting: none) {
  .js-scroll-fade {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ============================================
   z-index 階層リファレンス (数値が大きいほど前面)
   ============================================
   10000  スキップリンク（:focus-visible 時のみ）
    9999  ローディングオーバーレイ
    9998  ライトボックス
    1001  スクロール進捗バー / ハンバーガーボタン(header内)
    1000  ヘッダー
     999  モバイルメニュー(header内)
     900  トップへ戻るボタン
   ============================================ */

/* ============================================
   ヘッダー
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--color-bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.header--scrolled {
  background: rgba(6, 8, 16, 0.98);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.header__inner {
  /* コンテナ共通プロパティは .container が提供 */
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

/* ロゴ */
.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  transition: opacity var(--transition-base);
}

.header__logo:hover {
  opacity: 0.8;
  color: var(--color-text-primary);
}

.header__logo-icon {
  font-size: 1.8rem;
  color: var(--color-accent);
  line-height: 1;
}

.header__logo-text {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  line-height: 1.3;
  color: var(--color-text-primary);
}

.header__logo-text small {
  font-size: 0.65rem;
  font-family: var(--font-sans);
  letter-spacing: 0.3em;
  color: var(--color-accent);
  font-weight: 400;
}

/* ナビゲーション */
.header__nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.header__nav-link {
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  position: relative;
  transition: color var(--transition-base);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.header__nav-link:hover {
  color: var(--color-accent);
}

.header__nav-link:hover::after {
  transform: scaleX(1);
}

.header__nav-link--cta {
  color: var(--color-bg-main);
  background: var(--color-accent);
  border-radius: 4px;
  padding: 8px 20px;
  font-weight: 600;
  margin-left: 8px;
  position: relative;
  overflow: visible;
}

.header__nav-link--cta:hover {
  background: var(--color-accent-light);
  color: var(--color-bg-main);
}

.header__nav-link--cta::after {
  display: none;
}

/* CTA パルスアニメーション（注目誘導） */
.header__nav-link--cta::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 4px;
  background: var(--color-accent);
  opacity: 0;
  animation: ctaPulse 3s 2s ease-in-out infinite;
  pointer-events: none;
  z-index: -1;
}

@keyframes ctaPulse {
  0%, 100% { opacity: 0; transform: scale(1); }
  50%      { opacity: 0.3; transform: scale(1.1); }
}

/* アクティブ状態（スクロール位置に応じてJSで付与） */
.header__nav-link--active {
  color: var(--color-accent);
}

.header__nav-link--active::after {
  transform: scaleX(1);
}

/* ハンバーガーメニュー */
.header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 6px;
  z-index: 1001;
}

.header__hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

.header__hamburger.is-active .header__hamburger-line:nth-child(2) {
  opacity: 0;
}

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

/* モバイルメニュー */
.header__mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  height: 100dvh; /* プログレッシブエンハンスメント: dvh未対応ブラウザは上行の100vhを使用 */
  background: rgba(6, 8, 16, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
  z-index: 999;
}

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

.header__mobile-list {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.header__mobile-link {
  display: inline-block;
  padding: 16px 32px;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-text-primary);
  transition: color var(--transition-base), transform var(--transition-base);
}

.header__mobile-link:hover {
  color: var(--color-accent);
  transform: translateX(4px);
}

/* ============================================
   ヒーローセクション
   ============================================ */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
}

.hero__slider {
  width: 100%;
  height: 100%;
}

.hero__slider .swiper-wrapper {
  height: 100%;
}

.hero__slide {
  position: relative;
  width: 100%;
  height: 100%;
}

.hero__slide-image {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  /* 暗めのオーバーレイ */
  filter: brightness(0.4);
  transform: scale(1.05);
  transition: transform 8s ease-out;
}

.swiper-slide-active .hero__slide-image {
  transform: scale(1);
}

.hero__slide-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-left: 8%;
  padding-right: 30%;
  z-index: 2;
  /* グラデーションオーバーレイ */
  background: linear-gradient(
    90deg,
    rgba(10, 14, 26, 0.7) 0%,
    rgba(10, 14, 26, 0.3) 50%,
    transparent 100%
  );
}

.hero__slide-subtitle {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
  opacity: 0;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.5);
}

.swiper-slide-active .hero__slide-subtitle {
  animation: heroFadeUp 0.8s 0.3s forwards;
}

.hero__slide-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.4;
  color: var(--color-text-primary);
  margin-bottom: 20px;
  opacity: 0;
  /* A: テキストシマー――ゴールドの光が文字内を走る */
  background: linear-gradient(
    120deg,
    #fff 0%, #fff 40%,
    var(--color-accent-light) 50%,
    #fff 60%, #fff 100%
  );
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.swiper-slide-active .hero__slide-title {
  animation: heroFadeUp 0.8s 0.5s forwards, textShimmer 4s 2s ease-in-out infinite;
}

@keyframes textShimmer {
  0%   { background-position: 200% center; }
  100% { background-position: -200% center; }
}

.hero__slide-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
  opacity: 0;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.6);
}

.swiper-slide-active .hero__slide-desc {
  animation: heroFadeUp 0.8s 0.7s forwards;
}

@keyframes heroFadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ヒーロー ナビゲーションボタン */
.hero__nav-prev,
.hero__nav-next {
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-base);
}

.hero__nav-prev:hover,
.hero__nav-next:hover {
  color: var(--color-accent);
}

.hero__nav-prev::after,
.hero__nav-next::after {
  font-size: 24px;
}

.hero__pagination {
  bottom: 30px;
}

.hero__pagination .swiper-pagination-bullet {
  width: 10px;
  height: 10px;
  background: rgba(255, 255, 255, 0.4);
  opacity: 1;
  transition: all var(--transition-base);
}

.hero__pagination .swiper-pagination-bullet-active {
  background: var(--color-accent);
  width: 30px;
  border-radius: 5px;
}

/* ヒーロー 右パネル（日付 / アイコン） */
.hero__info-panel {
  position: absolute;
  top: 50%;
  right: 30px;
  transform: translateY(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  background: rgba(10, 14, 26, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 24px 16px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.hero__date {
  text-align: center;
}

.hero__date-year {
  font-family: var(--font-serif);
  font-size: 0.8rem;
  color: var(--color-accent);
  letter-spacing: 0.15em;
}

.hero__date-day {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: 0.05em;
}

.hero__info-icons {
  display: flex;
  gap: 16px;
}

.hero__info-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 1rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
}

.hero__info-icon:hover {
  background: var(--color-accent);
  color: var(--color-bg-main);
  border-color: var(--color-accent);
}

.hero__status {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero__status-dot {
  width: 8px;
  height: 8px;
  background: #4ade80;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ヒーロー スクロールダウンインジケーター */
.hero__scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.hero__scroll-text {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
}

.hero__scroll-line {
  display: block;
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--color-accent), transparent);
  transform-origin: top;
  animation: scrollLineSlide 2s ease-in-out infinite;
}

@keyframes scrollLineSlide {
  0%   { opacity: 0; transform: scaleY(0); }
  50%  { opacity: 1; transform: scaleY(1); }
  100% { opacity: 0; transform: scaleY(0); }
}

/* ============================================
   お知らせセクション
   ============================================ */
.notice {
  padding: 40px 0;
  background: linear-gradient(180deg, var(--color-bg-main) 0%, var(--color-bg-card) 100%);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.notice__label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
}

.notice__icon {
  font-size: 1.1rem;
  color: var(--color-accent);
}

.notice__label-text {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

.notice__list {
  margin-bottom: 20px;
}

.notice__item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border-light);
  transition: background var(--transition-base);
  flex-wrap: wrap;
}

.notice__item:hover {
  background: rgba(197, 165, 90, 0.03);
}

.notice__date {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
  flex-shrink: 0;
  min-width: 90px;
}

.notice__tag {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 2px 10px;
  border-radius: 3px;
  flex-shrink: 0;
}

.notice__tag--important {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.notice__tag--event {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.notice__tag--info {
  background: rgba(197, 165, 90, 0.15);
  color: var(--color-accent);
  border: 1px solid var(--color-border);
}

.notice__title {
  font-size: 0.925rem;
  color: var(--color-text-primary);
  transition: color var(--transition-base);
  flex: 1;
  min-width: 200px;
}

.notice__title:hover {
  color: var(--color-accent);
}

.notice__more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--color-accent);
  padding: 8px 0;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.notice__more:hover {
  border-bottom-color: var(--color-accent);
}

/* ============================================
   博物館紹介セクション
   ============================================ */
.about {
  padding: var(--section-padding);
  background: var(--color-bg-main);
}

.about__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about__text {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 2;
}

.about__text p {
  margin-bottom: 16px;
}

.about__info-box {
  margin-top: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: 8px;
  padding: 24px;
}

.about__info-item {
  display: flex;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 0.9rem;
}

.about__info-item:last-child {
  border-bottom: none;
}

.about__info-label {
  font-weight: 600;
  color: var(--color-accent);
  min-width: 80px;
  flex-shrink: 0;
}

.about__info-value {
  color: var(--color-text-secondary);
}

.about__image {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
}

.about__image::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  pointer-events: none;
}

.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.about__image:hover img {
  transform: scale(1.03);
}

/* ============================================
   トピックスセクション
   ============================================ */
.topics {
  padding: var(--section-padding);
  background: var(--color-bg-card);
}

.topics__carousel {
  position: relative;
  padding: 0 50px;
}

.topics__slider {
  overflow: visible;          /* ホバーで浮き上がるカードをクリップしない */
  /* 20pxバッファ付きクリッピング: hover時のtranslateY/box-shadowを許容しつつ画面外スライドを隠す */
  clip-path: inset(-20px -20px -20px -20px);
  -webkit-clip-path: inset(-20px -20px -20px -20px);
}

/* トピックスカード */
.topics__card {
  height: auto;
}

.topics__card-link {
  position: relative;
  display: block;
  background: var(--color-bg-main);
  border: 1px solid var(--color-border-light);
  border-radius: 8px;
  /* overflow: hidden を除去 — SVGストロークがクリップされるのを防止。
     画像の角丸クリッピングは .topics__card-image 側で処理 */
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.topics__card-link:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  color: var(--color-text-primary);
}

.topics__card-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 11;
  /* 親の .topics__card-link から overflow:hidden を除去したため、
     画像の上側角丸をここでクリッピング */
  border-radius: 8px 8px 0 0;
}

.topics__card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.topics__card-link:hover .topics__card-image img {
  transform: scale(1.08);
}

.topics__card-category {
  position: absolute;
  top: 12px;
  left: 12px;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 3px;
  letter-spacing: 0.05em;
}

.topics__card-category--exhibition {
  background: rgba(197, 165, 90, 0.9);
  color: var(--color-bg-main);
}

.topics__card-category--event {
  background: rgba(59, 130, 246, 0.9);
  color: #fff;
}

.topics__card-category--sns {
  background: rgba(236, 72, 153, 0.9);
  color: #fff;
}

.topics__card-body {
  padding: 20px;
}

.topics__card-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 10px;
  color: var(--color-text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.topics__card-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.topics__card-date {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

/* トピックスナビゲーション */
.topics__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
  z-index: 10;
}

.topics__nav:hover {
  background: var(--color-accent);
  color: var(--color-bg-main);
  border-color: var(--color-accent);
}

.topics__nav--prev {
  left: 0;
}

.topics__nav--next {
  right: 0;
}

.topics__pagination {
  text-align: center;
  margin-top: 30px;
}

.topics__pagination .swiper-pagination-bullet {
  width: 8px;
  height: 8px;
  background: rgba(255, 255, 255, 0.3);
  opacity: 1;
  margin: 0 4px;
  transition: all var(--transition-base);
}

.topics__pagination .swiper-pagination-bullet-active {
  background: var(--color-accent);
  width: 24px;
  border-radius: 4px;
}

/* ============================================
   展示案内セクション
   ============================================ */
.exhibition {
  padding: var(--section-padding);
  background: var(--color-bg-main);
}

.exhibition__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: auto auto;
  gap: 16px;
}

.exhibition__item {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 4 / 3;
}

.exhibition__item--large {
  grid-column: span 2;
  grid-row: span 2;
  aspect-ratio: auto;
}

.exhibition__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.exhibition__item:hover img {
  transform: scale(1.06);
}

.exhibition__item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    transparent 30%,
    rgba(10, 14, 26, 0.85) 100%
  );
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
  transition: background var(--transition-base);
}

.exhibition__item:hover .exhibition__item-overlay {
  background: linear-gradient(
    180deg,
    rgba(10, 14, 26, 0.2) 0%,
    rgba(10, 14, 26, 0.9) 100%
  );
}

.exhibition__item-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  background: var(--color-accent);
  color: var(--color-bg-main);
  border-radius: 3px;
  margin-bottom: 10px;
  width: fit-content;
}

.exhibition__item-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
}

.exhibition__item--large .exhibition__item-title {
  font-size: 1.5rem;
}

.exhibition__item-desc {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
}

/* ============================================
   ギャラリーセクション
   ============================================ */
.gallery {
  padding: var(--section-padding);
  background: var(--color-bg-card);
}

.gallery__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.gallery__item {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 3 / 2;
}

.gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow), filter var(--transition-base);
  filter: brightness(0.7);
}

.gallery__item:hover img {
  transform: scale(1.06);
  filter: brightness(0.9);
}

.gallery__item-caption {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
  background: linear-gradient(
    180deg,
    transparent 40%,
    rgba(10, 14, 26, 0.8) 100%
  );
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.gallery__item:hover .gallery__item-caption,
.gallery__item:focus-visible .gallery__item-caption {
  opacity: 1;
  transform: translateY(0);
}

.gallery__item-caption h3 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--color-text-primary);
}

.gallery__item-caption p {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
}

/* ============================================
   アクセスセクション
   ============================================ */
.access {
  padding: var(--section-padding);
  background: var(--color-bg-main);
}

.access__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.access__map-placeholder {
  width: 100%;
  height: 360px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--color-text-muted);
}

.access__map-placeholder i {
  font-size: 3rem;
  color: var(--color-accent);
  opacity: 0.5;
}

.access__map-placeholder p {
  font-size: 0.85rem;
}

.access__name {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--color-text-primary);
}

.access__info {
  display: grid;
  gap: 4px;
}

.access__info dt {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.access__info dt i {
  font-size: 0.9rem;
}

.access__info dd {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  padding-left: 24px;
  line-height: 1.8;
}

/* ============================================
   お問い合わせセクション
   ============================================ */
.contact {
  padding: var(--section-padding);
  background: var(--color-bg-card);
}

.contact__inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

.contact__lead {
  text-align: center;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 40px;
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact__form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact__label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.contact__required {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-error);
  background: rgba(239, 68, 68, 0.1);
  padding: 1px 8px;
  border-radius: 3px;
}

.contact__input,
.contact__textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--color-bg-main);
  border: 1px solid var(--color-border-light);
  border-radius: 6px;
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  outline: none;
}

.contact__input::placeholder,
.contact__textarea::placeholder {
  color: var(--color-text-muted);
}

.contact__input:focus,
.contact__textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(197, 165, 90, 0.15);
}

/* 防御的スタイル: JSが .is-error をフォーカス時に即除去するため通常は不到達だが、
   プログラム的フォーカス移動時の一瞬やJS無効環境向けに維持 */
.contact__input.is-error:focus,
.contact__textarea.is-error:focus {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.contact__textarea {
  resize: vertical;
  min-height: 140px;
}

.contact__submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 48px;
  background: var(--color-accent);
  color: var(--color-bg-main);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  border-radius: 6px;
  transition: all var(--transition-base);
  align-self: center;
  margin-top: 8px;
}

.contact__submit:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(197, 165, 90, 0.3);
}

.contact__submit:focus-visible {
  outline: 2px solid var(--color-accent-light);
  outline-offset: 3px;
}

.contact__submit:active {
  transform: translateY(0);
}

/* 送信成功状態 */
.contact__submit--success {
  background: var(--color-success);
  pointer-events: none;
}

/* フォームエラー */
.contact__error {
  color: var(--color-error);
  font-size: 0.8rem;
  margin-top: 4px;
}

.contact__input.is-error,
.contact__textarea.is-error {
  border-color: var(--color-error);
}

/* ============================================
   フッター
   ============================================ */
.footer {
  background: var(--color-bg-footer);
  border-top: 1px solid var(--color-border-light);
}

.footer__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 60px 24px 30px;
}

/* サイトマップ */
.footer__sitemap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 50px;
}

.footer__column-title {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.footer__column-list li {
  margin-bottom: 8px;
}

.footer__column-list a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: color var(--transition-base), padding-left var(--transition-base);
}

.footer__column-list a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

/* フッター下部 */
.footer__bottom {
  border-top: 1px solid var(--color-border-light);
  padding-top: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer__logo-icon {
  font-size: 1.4rem;
  color: var(--color-accent);
}

.footer__logo-text {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.footer__social {
  display: flex;
  gap: 16px;
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border-light);
  border-radius: 50%;
  font-size: 1rem;
  color: var(--color-text-muted);
  transition: all var(--transition-base);
}

.footer__social-link:hover {
  background: var(--color-accent);
  color: var(--color-bg-main);
  border-color: var(--color-accent);
}

.footer__copyright {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* ============================================
   トップへ戻るボタン
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-bg-main);
  border-radius: 50%;
  font-size: 1rem;
  box-shadow: 0 4px 16px rgba(197, 165, 90, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 900;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent-light);
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(197, 165, 90, 0.4);
}

/* ============================================
   ローディングオーバーレイ
   ============================================ */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--color-bg-main);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loading-overlay.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-overlay__icon {
  font-size: 2.5rem;
  color: var(--color-accent);
  animation: loadingPulse 1.5s ease-in-out infinite;
}

.loading-overlay__text {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.2em;
}

@keyframes loadingPulse {
  0%, 100% { opacity: 0.3; transform: scale(0.95); }
  50% { opacity: 1; transform: scale(1.05); }
}

/* ============================================
   レスポンシブ - タブレット
   ============================================ */
@media (max-width: 1024px) {
  .header__nav {
    display: none;
  }

  .header__hamburger {
    display: flex;
  }

  .hero__slide-overlay {
    padding-right: 20%;
  }

  .hero__info-panel {
    display: none;
  }

  .about__content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about__image {
    order: -1;
    max-height: 300px;
  }

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

  .exhibition__item--large {
    grid-column: span 2;
    grid-row: span 1;
    aspect-ratio: 2 / 1;
  }

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

  .access__content {
    grid-template-columns: 1fr;
  }

  .footer__sitemap {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }

  .topics__carousel {
    padding: 0 40px;
  }
}

/* ============================================
   レスポンシブ - スマートフォン
   ============================================ */
@media (max-width: 640px) {
  :root {
    --section-padding: 60px 0;
  }

  html {
    scroll-padding-top: 70px;
  }

  .header__inner {
    height: 70px;
  }

  .header__logo-text {
    font-size: 0.9rem;
  }

  .section-heading {
    margin-bottom: 40px;
  }

  .section-heading__ja {
    font-size: 1.4rem;
  }

  /* ヒーロー */
  .hero {
    min-height: 500px;
    height: 80vh;
  }

  .hero__slide-overlay {
    padding: 0 24px 80px;
    justify-content: flex-end;
    background: linear-gradient(
      180deg,
      transparent 20%,
      rgba(10, 14, 26, 0.8) 100%
    );
  }

  .hero__slide-title {
    font-size: 1.8rem;
  }

  .hero__slide-desc {
    font-size: 0.85rem;
  }

  .hero__nav-prev,
  .hero__nav-next {
    display: none;
  }

  .hero__scroll-indicator {
    bottom: 24px;
  }

  /* お知らせ */
  .notice__item {
    flex-direction: column;
    gap: 6px;
  }

  .notice__date {
    min-width: auto;
  }

  /* トピックス */
  .topics__carousel {
    padding: 0;
  }

  .topics__nav {
    display: none;
  }

  /* 展示 */
  .exhibition__grid {
    grid-template-columns: 1fr;
  }

  .exhibition__item--large {
    grid-column: span 1;
    grid-row: span 1;
    aspect-ratio: 16 / 9;
  }

  .exhibition__item {
    aspect-ratio: 16 / 9;
  }

  /* ギャラリー */
  .gallery__grid {
    grid-template-columns: 1fr;
  }

  .gallery__item-caption {
    opacity: 1;
    transform: translateY(0);
  }

  /* アクセス */
  .access__map-placeholder {
    height: 250px;
  }

  /* フッター */
  .footer__sitemap {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer__inner {
    padding: 40px 24px 20px;
  }

  /* ライトボックス・カウントアップのレスポンシブは
     各コンポーネント定義後に配置（ソースオーダー問題回避）*/
}

/* ============================================
   ユーティリティ
   ============================================ */
/* スムーズなページ表示用
   複数コンポーネント（モバイルメニュー・ライトボックス）が競合しないよう
   JS側でlockScroll/unlockScrollユーティリティでカウント管理 */
.no-scroll {
  overflow: hidden;
  overscroll-behavior: none;
}

/* フォーカス可視化（アクセシビリティ） */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* セレクトカラー */
::selection {
  background: rgba(197, 165, 90, 0.3);
  color: var(--color-text-primary);
}

/* ============================================
   パーティクル演出（ヒーローセクション）
   ============================================ */
.hero__particles {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  width: 100%;
  height: 100%;
}

/* ============================================
   セクションデバイダー（和柄SVG）
   --reverse : 水平反転で変化を付ける
   --cloud   : CSS装飾なし。HTMLのSVGパス形状自体が異なる。
   ============================================ */
.section-divider {
  width: 100%;
  line-height: 0;
  margin: -1px 0;
  overflow: hidden;
}

.section-divider svg {
  width: 100%;
  height: 40px;
  display: block;
}

.section-divider--reverse {
  transform: scaleX(-1);
}

/* ============================================
   カウントアップ数値（Aboutセクション）
   ============================================ */
.about__stats {
  display: flex;
  gap: 32px;
  margin-top: 32px;
  margin-bottom: 8px;
}

.about__stat-item {
  text-align: center;
  flex: 1;
  padding: 20px 12px;
  background: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  position: relative;
  overflow: hidden;
}

.about__stat-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

.about__stat-number {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
  display: inline;
}

.about__stat-suffix {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: var(--color-accent-light);
  margin-left: 2px;
}

.about__stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: 6px;
  letter-spacing: 0.05em;
}

/* ============================================
   ギャラリーライトボックス
   ============================================ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 9998;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

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

.lightbox__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.lightbox__content {
  position: relative;
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 1;
}

.lightbox__image {
  max-width: 100%;
  max-height: 75vh;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  transform: scale(0.9);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.lightbox.is-open .lightbox__image {
  transform: scale(1);
}

.lightbox__caption {
  margin-top: 16px;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  text-align: center;
  letter-spacing: 0.05em;
}

.lightbox__close {
  position: fixed;
  top: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  transition: all var(--transition-base);
}

.lightbox__close:hover {
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.15);
  transform: rotate(90deg);
}

.lightbox__nav {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  transition: all var(--transition-base);
}

.lightbox__nav:hover {
  color: var(--color-accent);
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--color-accent);
}

.lightbox__nav--prev {
  left: 24px;
}

.lightbox__nav--next {
  right: 24px;
}

.lightbox__counter {
  margin-top: 8px;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  letter-spacing: 0.15em;
}

/* ライトボックス・カウントアップの640pxレスポンシブは
   メインのスマートフォンMQブロックに統合済み */

/* ============================================
   スクロール進捗バー
   ============================================ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-dark), var(--color-accent), var(--color-accent-light));
  z-index: 1001;
  pointer-events: none;
  transition: none;
  box-shadow: 0 0 8px rgba(197, 165, 90, 0.4);
}

/* ============================================
   文字分割アニメーション用
   ============================================ */
.char-split {
  display: inline-block;
  overflow: hidden;
}

.char-split__char {
  display: inline-block;
  will-change: transform, opacity;
}

/* ============================================
   マグネティックボタン
   ============================================ */
[data-magnetic] {
  will-change: transform;
}

/* ============================================
   3Dチルトカード
   ============================================ */
.js-tilt {
  transform-style: preserve-3d;
  will-change: transform;
}

/* グロー効果: CSS変数経由でJS側から位置・不透明度を制御 */
.js-tilt::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    circle at var(--glow-x, 50%) var(--glow-y, 50%),
    rgba(197, 165, 90, var(--glow-opacity, 0)),
    transparent 60%
  );
  pointer-events: none;
  z-index: 1;
}

/* ============================================
   横スクロール展示 (Desktop)
   JSが .is-horizontal を付与した場合のみ有効。
   タブレット以下では通常のGridを維持。
   ============================================ */
.exhibition__scroll-wrapper {
  overflow: hidden;
}

.exhibition__grid.is-horizontal {
  display: flex;
  flex-wrap: nowrap;
  gap: 24px;
  width: max-content;
  padding-right: 4vw;
}

.exhibition__grid.is-horizontal .exhibition__item {
  flex: 0 0 35vw;
  height: auto;
  min-height: 380px;
  aspect-ratio: auto;
}

.exhibition__grid.is-horizontal .exhibition__item--large {
  flex: 0 0 50vw;
  grid-column: initial;
  grid-row: initial;
}

/* ============================================
   Aboutパララックス深度
   GSAP fromTo で y プロパティを scrub 連動で直接制御。
   ============================================ */
.about__content.has-parallax .about__text {
  will-change: transform;
}

.about__content.has-parallax .about__image {
  will-change: transform;
}

/* ============================================
   トピックスカード ストロークドロー
   ============================================ */
/* ※ position: relative は .topics__card-link に設定済み */

.topics__card-stroke {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
  overflow: visible;
}

.topics__card-stroke rect {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 2;
}

/* ============================================
   フッターマーキー
   ============================================ */
.footer__marquee {
  overflow: hidden;
  white-space: nowrap;
  border-bottom: 1px solid var(--color-border-light);
  padding: 14px 0;
}

.footer__marquee-track {
  display: inline-flex;
  animation: marqueeScroll 25s linear infinite;
}

.footer__marquee-text {
  font-family: var(--font-serif);
  font-size: clamp(0.85rem, 1.5vw, 1.1rem);
  color: var(--color-text-muted);
  letter-spacing: 0.15em;
  padding-right: 3em;
  flex-shrink: 0;
  min-width: 50vw; /* 各コピーがビューポート幅の半分以上を占め、広幅画面でも継ぎ目が出ない */
}

/* テキストを 2本複製してループさせるため -50% でリセット */
@keyframes marqueeScroll {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ============================================
   レスポンシブ補正（ソースオーダー問題回避）
   ベース定義がメインMQブロックより後にあるコンポーネント用。
   ここに配置することでカスケードが正しく機能する。
   ============================================ */
@media (max-width: 640px) {
  .about__stats {
    flex-direction: column;
    gap: 16px;
  }

  .about__stat-number {
    font-size: 1.8rem;
  }

  .lightbox__nav {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .lightbox__nav--prev {
    left: 12px;
  }

  .lightbox__nav--next {
    right: 12px;
  }

  .lightbox__close {
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
  }
}

/* ============================================
   スマートフォン: アニメーション無効化
   モバイル実機での安定表示を優先し、
   全アニメーション・トランジションを無効化する
   ============================================ */
@media (max-width: 640px) {
  /* 全要素のアニメーション・トランジションを一括無効化 */
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .js-scroll-fade {
    opacity: 1 !important;
    transform: none !important;
  }

  .about__image,
  .exhibition__item {
    clip-path: none !important;
    -webkit-clip-path: none !important;
  }

  .scroll-progress {
    display: none;
  }

  .hero__scroll-indicator {
    display: none;
  }

  .hero__slide-image {
    transition: none !important;
    transform: scale(1) !important;
  }

  .hero__slide-subtitle,
  .hero__slide-title,
  .hero__slide-desc {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }

  .hero__slide-title {
    -webkit-text-fill-color: var(--color-text-primary);
    background: none;
  }

  .section-heading__en,
  .section-heading__line,
  .section-heading__ja {
    opacity: 1 !important;
    transform: none !important;
  }

  .char-split__char {
    opacity: 1 !important;
    transform: none !important;
  }

  .footer__marquee-track {
    animation: none !important;
  }

  .header__nav-link--cta::before {
    animation: none !important;
  }
}

/* ============================================
   アクセシビリティ: アニメーション無効化
   ユーザーが「視覚効果を減らす」設定を有効にしている場合、
   全アニメーションを無効化して快適に閲覧できるようにする
   ============================================ */
@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;
  }

  .hero__slide-image {
    transition: none;
  }

  .hero__slide-title {
    -webkit-text-fill-color: var(--color-text-primary);
    background: none;
  }

  .js-scroll-fade {
    opacity: 1;
    transform: none;
  }

  .scroll-progress {
    display: none;
  }

  .footer__marquee-track {
    animation: none;
  }

  .hero__scroll-indicator {
    display: none;
  }

  .header__nav-link--cta::before {
    animation: none;
  }
}