/* ==========================================================================
   有馬文庫（非公式案内ページ） - スタイルシート
   コンセプト：落ち着いた歴史資料館・和モダンな上質感
   配慮：シニア向け高視認性・文字サイズ可変設計・WCAGコントラスト準拠
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS 変数・デザイントークン
   -------------------------------------------------------------------------- */
:root {
  /* フォントサイズ設定（標準モード） */
  --font-base-size: 18px;
  --font-line-height: 1.85;

  /* カラーパレット（和モダン・落ち着いた知のアーカイブ） */
  --bg-body: #FAF7F2;          /* 和紙・生成り */
  --bg-card: #FFFFFF;          /* カード白 */
  --bg-sub: #F3ECE3;           /* サブ背景・薄茶 */
  --bg-accent-soft: #FBF5EA;   /* 金泉ゴールド薄 */
  --bg-notice-soft: #FDF3F1;   /* 漆朱薄（注意書き用） */
  --bg-accessibility-bar: #EDE4D8; /* アクセシビリティバー背景 */

  --text-main: #25221F;        /* 墨色（真っ黒を避け目に優しい高コントラスト） */
  --text-sub: #544E48;         /* 濃いグレー茶（補足文用） */
  --text-muted: #787068;       /* 注釈用 */
  --text-inverse: #FFFFFF;     /* 白文字 */
  --text-footer-desc: #D3CCC4; /* フッター説明文 */

  --color-primary: #1E2D38;     /* 深鉄紺（品格・知性） */
  --color-primary-hover: #131E26;
  --color-gold: #B87D28;        /* 有馬金泉ゴールド */
  --color-gold-hover: #9E681C;
  --color-gold-border: #DFC7A0;
  --color-vermilion: #A13B2E;   /* 漆朱（ステップ番号・重要注意） */
  --color-vermilion-soft: #F8E7E4;
  --color-green: #2E6B4F;       /* 常盤緑（開館中ステータス用） */

  --border-light: #E7DFD5;
  --border-medium: #D1C5B6;
  --border-dark: #1E2D38;

  --shadow-sm: 0 2px 6px rgba(37, 34, 31, 0.05);
  --shadow-md: 0 6px 18px rgba(37, 34, 31, 0.08);
  --shadow-lg: 0 12px 28px rgba(37, 34, 31, 0.12);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;

  --container-max: 1080px;
}

/* --------------------------------------------------------------------------
   リセット & ベーススタイル
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-base-size);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 1rem;
  line-height: var(--font-line-height);
  color: var(--text-main);
  background-color: var(--bg-body);
  background-image: radial-gradient(rgba(184, 125, 40, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
  letter-spacing: 0.03em;
  word-wrap: break-word;
  overflow-x: hidden;
}

/* 見出し専用フォント（明朝体） */
.font-mincho,
h1, h2, h3, .brand-title, .hero-heading {
  font-family: "Shippori Mincho", "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 700;
  letter-spacing: 0.05em;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-gold);
  outline-offset: 3px;
}

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

/* --------------------------------------------------------------------------
   レイアウト用共通コンテナ
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section-block {
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.section-block.bg-sub {
  background-color: var(--bg-sub);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

/* セクション見出し（和モダン上質感） */
.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
  position: relative;
}

.section-tag {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-gold);
  background: var(--bg-accent-soft);
  border: 1px solid var(--color-gold-border);
  padding: 0.25rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
  letter-spacing: 0.08em;
}

.section-title {
  font-size: 2rem;
  color: var(--color-primary);
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.section-lead {
  font-size: 1.05rem;
  color: var(--text-sub);
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.section-header::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  background-color: var(--color-gold);
  margin: 1.25rem auto 0;
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   開館・受付ステータスバー（最上部）
   -------------------------------------------------------------------------- */
.accessibility-bar {
  background-color: var(--bg-accessibility-bar);
  border-bottom: 1px solid var(--border-medium);
  font-size: 0.9rem;
  padding: 0.45rem 0;
}

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

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--text-main);
}

.status-badge-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-green);
  display: inline-block;
  box-shadow: 0 0 0 2px rgba(46, 107, 79, 0.2);
}

.status-badge-dot.closed {
  background-color: var(--text-muted);
  box-shadow: none;
}

/* --------------------------------------------------------------------------
   ヘッダー・ナビゲーション
   -------------------------------------------------------------------------- */
.site-header {
  background-color: rgba(250, 247, 242, 0.96);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: box-shadow var(--transition-fast);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.brand-wrap {
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
  transition: transform var(--transition-fast);
}

.brand-wrap:hover .brand-logo-img {
  transform: scale(1.05);
}

.brand-text-block {
  display: flex;
  flex-direction: column;
}

.brand-sub {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-gold);
  letter-spacing: 0.08em;
  margin-bottom: 0.1rem;
}

.brand-title {
  font-size: 1.4rem;
  color: var(--color-primary);
  line-height: 1.2;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-link {
  text-decoration: none;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 0.5rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-gold);
  background-color: rgba(184, 125, 40, 0.08);
}

.header-cta-btn {
  text-decoration: none;
  background-color: var(--color-primary);
  color: var(--text-inverse);
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.header-cta-btn:hover {
  background-color: var(--color-gold);
  border-color: var(--color-gold);
  color: var(--text-inverse);
}

/* モバイルメニューボタン */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  color: var(--color-primary);
  cursor: pointer;
  min-width: 48px;
  min-height: 48px;
}

.mobile-nav-drawer {
  display: none;
  background-color: var(--bg-card);
  border-bottom: 2px solid var(--color-gold);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-lg);
}

.mobile-nav-drawer.open {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mobile-nav-link {
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  padding: 0.75rem 0.5rem;
  border-bottom: 1px dashed var(--border-light);
  display: block;
}

/* --------------------------------------------------------------------------
   ヒーローセクション
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  padding-top: 5rem;
  padding-bottom: 6rem;
  background-image: url('assets/hero-bg.webp');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  border-bottom: 1px solid var(--border-light);
  overflow: hidden;
}

/* 和紙・生成り調の上品なオーバーレイ幕（左側のテキスト可読性を100%確保しつつ、右側の背景写真の情緒を美しく活かす） */
.hero-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(250, 247, 242, 0.97) 0%,
    rgba(250, 247, 242, 0.90) 50%,
    rgba(250, 247, 242, 0.40) 100%
  );
  pointer-events: none;
  z-index: 1;
}

.hero-section .container {
  position: relative;
  z-index: 2;
}

.hero-wrapper {
  max-width: 720px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

/* 非公式明記バッジ */
.unofficial-notice-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: rgba(250, 242, 235, 0.95);
  border: 1px solid #E6D2C4;
  color: #7D4A27;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.unofficial-tag {
  background-color: #8C532B;
  color: #FFFFFF;
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.hero-heading {
  font-size: 2.6rem;
  line-height: 1.35;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.hero-heading .highlight {
  color: var(--color-gold);
  display: inline-block;
  border-bottom: 2px solid var(--color-gold-border);
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--text-sub);
  line-height: 1.9;
  margin-bottom: 2.25rem;
  max-width: 660px;
}

.hero-btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.95rem 1.85rem;
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  min-height: 52px;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background-color: var(--color-gold);
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.95);
  color: var(--color-primary);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  background-color: var(--bg-card);
  color: var(--color-primary);
}

/* 写真プレースホルダーの共通スタイル */
.photo-placeholder {
  background-color: #EDE7DD;
  border: 2px dashed #C9BCAB;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem;
  color: #6E6358;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.photo-placeholder:hover {
  border-color: var(--color-gold);
  background-color: #ECE3D4;
}

.placeholder-icon {
  width: 48px;
  height: 48px;
  color: #948574;
  margin-bottom: 0.75rem;
}

.placeholder-title {
  font-weight: 700;
  font-size: 1rem;
  color: #4A4036;
  margin-bottom: 0.25rem;
}

.placeholder-hint {
  font-size: 0.82rem;
  color: #85786B;
}

/* 実際の写真を挿入した場合のスタイル */
.content-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.hero-quick-summary {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-light);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.quick-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.quick-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 600;
}

.quick-value {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   有馬文庫について（About）案B：上部概要 ＋ 下部3列カード
   -------------------------------------------------------------------------- */
.about-overview-wrap {
  max-width: 860px;
  margin: 0 auto 2.5rem;
}

.about-overview-box {
  background: var(--bg-accent-soft);
  border: 1px solid var(--color-gold-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 3rem;
  box-shadow: 0 4px 18px rgba(184, 125, 40, 0.08);
  position: relative;
  text-align: center;
}

.about-subheading {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  line-height: 1.4;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.about-subheading::before,
.about-subheading::after {
  content: "";
  display: inline-block;
  width: 20px;
  height: 1px;
  background-color: var(--color-gold);
  vertical-align: middle;
}

.about-text {
  font-size: 1.05rem;
  color: var(--text-main);
  line-height: 1.9;
  margin-bottom: 1rem;
  text-align: left;
}

.about-text:last-child {
  margin-bottom: 0;
}

/* おすすめのシーン・キータグ */
.about-tags-wrap {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--color-gold-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
}

.about-tags-label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.05em;
}

.about-tags-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 0.6rem;
}

.about-tag {
  background-color: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--color-gold-border);
  color: var(--color-primary);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  box-shadow: 0 1px 3px rgba(184, 125, 40, 0.06);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
}

.about-tag:hover {
  background-color: #FFFFFF;
  border-color: var(--color-gold);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* 下部：3つの特徴カード（横3列） */
.about-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.about-feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.about-feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-gold-border);
  box-shadow: var(--shadow-md);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #FBF5EA 0%, #F5ECE0 100%);
  border: 1px solid var(--color-gold-border);
  color: var(--color-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(184, 125, 40, 0.12);
}

.feature-content {
  flex-grow: 1;
}

.feature-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
  line-height: 1.4;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin: 0;
}

/* --------------------------------------------------------------------------
   ご利用の流れ（How to Use）★最重要 4ステップ
   -------------------------------------------------------------------------- */
.step-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
}

.step-card {
  background: var(--bg-card);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.step-card:hover {
  border-color: var(--color-gold);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.step-header {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  margin-bottom: 1.25rem;
}

/* 和モダン・サークルバッジ（案B） */
.step-badge {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(145deg, #FAF4E8 0%, #F4E8D6 100%);
  border: 1.5px solid var(--color-gold);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 3px 8px rgba(184, 125, 40, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.8);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.step-card:hover .step-badge {
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 6px 14px rgba(184, 125, 40, 0.22);
}

.step-badge-sub {
  font-family: "Outfit", sans-serif;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-gold);
  line-height: 1;
  margin-bottom: 2px;
  text-transform: uppercase;
}

.step-badge-num {
  font-family: "Outfit", "Noto Sans JP", sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.step-card-title {
  font-size: 1.25rem;
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.4;
}

.step-desc {
  font-size: 1.05rem;
  color: var(--text-main);
  line-height: 1.85;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

/* ステップ内の写真・イラスト枠 */
.step-photo-wrap {
  margin-top: 1rem;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.step-photo {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  display: block;
}

/* 独立した入室後のご案内カード */
.step-guidelines-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2.5rem;
  position: relative;
}

.step-guidelines-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 2rem;
  right: 2rem;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-primary));
  border-radius: 2px;
}

.guidelines-header {
  margin-bottom: 1.25rem;
}

.guidelines-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}

.guidelines-lead {
  font-size: 0.98rem;
  color: var(--text-sub);
  margin: 0;
}

.guidelines-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.guideline-item {
  background: var(--bg-sub);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: border-color var(--transition-fast);
}

.guideline-item:hover {
  border-color: var(--color-gold-border);
}

.guideline-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: var(--bg-card);
}

.guideline-icon-box.icon-slipper {
  color: var(--color-vermilion);
  border: 1px solid #EFC4BE;
}

.guideline-icon-box.icon-facility {
  color: #174A69;
  border: 1px solid #C4DCEB;
}

.guideline-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}

.guideline-desc {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.7;
  margin: 0;
}



/* --------------------------------------------------------------------------
   蔵書・資料（Collections）
   -------------------------------------------------------------------------- */
.collection-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.collection-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.collection-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.collection-photo-holder {
  width: 100%;
  overflow: hidden;
  background: #FAF7F2;
}

.collection-photo {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--border-light);
  transition: transform var(--transition-medium);
}

.collection-card:hover .collection-photo {
  transform: scale(1.03);
}

.collection-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.collection-tags-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.collection-tag {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-gold);
}

.tag-status-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: #9C4221;
  background-color: #FEEBC8;
  border: 1px solid #FBD38D;
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-sm);
}

.collection-title {
  font-size: 1.2rem;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.collection-desc {
  font-size: 0.98rem;
  color: var(--text-sub);
  line-height: 1.75;
  margin: 0;
}

/* 閲覧スペース紹介カード（カード6） */
.collection-card-highlight {
  background-color: var(--bg-accent-soft);
  border-color: var(--color-gold-border);
}

.collection-body-center {
  justify-content: center;
  text-align: center;
  padding: 2rem;
}

.collection-icon-gold {
  color: var(--color-gold);
  margin: 0 auto 1rem;
}

.collection-title-tight {
  margin-bottom: 0.5rem;
}

/* テーブル内の強調・ルールリスト */
.price-highlight {
  color: var(--color-gold);
  font-size: 1.15rem;
  font-weight: 700;
}

.info-rule-list {
  padding-left: 1.25rem;
  margin: 0;
  line-height: 1.8;
}

/* フッター説明文 */
.footer-desc {
  line-height: 1.8;
  color: var(--text-footer-desc);
}

/* --------------------------------------------------------------------------
   開館・ご利用案内（Information）
   -------------------------------------------------------------------------- */
.info-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
}

.info-table tr {
  border-bottom: 1px solid var(--border-light);
}

.info-table tr:last-child {
  border-bottom: none;
}

.info-table th {
  background-color: var(--bg-sub);
  color: var(--color-primary);
  font-weight: 700;
  text-align: left;
  padding: 1.25rem 1.5rem;
  width: 28%;
  vertical-align: top;
  font-size: 1.05rem;
}

.info-table td {
  padding: 1.25rem 1.5rem;
  color: var(--text-main);
  font-size: 1.05rem;
  line-height: 1.8;
  vertical-align: top;
}

.highlight-time {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.alert-text {
  color: var(--color-vermilion);
  font-weight: 700;
}

.info-notes-card {
  background: var(--bg-accent-soft);
  border: 1px solid var(--color-gold-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 2rem;
}

.info-notes-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.info-notes-list {
  padding-left: 1.25rem;
  color: var(--text-main);
  font-size: 1rem;
  line-height: 1.8;
}

.info-notes-list li {
  margin-bottom: 0.4rem;
}

.info-notes-list li:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   所在地・アクセス（Access）
   -------------------------------------------------------------------------- */
.access-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.access-details {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
}

.access-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.access-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px dashed var(--border-light);
}

.access-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.access-label {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-gold);
}

.access-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
}

.access-subnote {
  font-size: 0.95rem;
  color: var(--text-sub);
  font-weight: normal;
}

.tel-link {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.tel-link:hover {
  color: var(--color-gold);
}

.tel-hours {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: normal;
}

/* 位置関係のわかりやすいガイドボックス */
.relation-box {
  background: var(--bg-sub);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1.25rem;
}

.relation-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.relation-text {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.65;
  margin: 0;
}

/* Google マップ レスポンシブコンテナ */
.map-container {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  height: 100%;
  min-height: 420px;
  display: flex;
  flex-direction: column;
}

.map-header {
  padding: 1rem 1.25rem;
  background-color: var(--bg-sub);
  border-bottom: 1px solid var(--border-light);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.map-iframe-wrap {
  flex-grow: 1;
  position: relative;
  width: 100%;
  min-height: 380px;
}

.map-iframe-wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* --------------------------------------------------------------------------
   よくあるご質問（FAQ）
   -------------------------------------------------------------------------- */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-gold);
}

.faq-question {
  width: 100%;
  background: transparent;
  border: none;
  padding: 1.25rem 1.5rem;
  text-align: left;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-q-text {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.faq-q-icon {
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: var(--text-inverse);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  flex-shrink: 0;
}

.faq-toggle-arrow {
  width: 24px;
  height: 24px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.open .faq-toggle-arrow {
  transform: rotate(180deg);
  color: var(--color-gold);
}

.faq-answer {
  display: none;
  padding: 0 1.5rem 1.5rem 4rem;
  color: var(--text-main);
  font-size: 1.02rem;
  line-height: 1.85;
  border-top: 1px dashed var(--border-light);
  padding-top: 1rem;
}

.faq-item.open .faq-answer {
  display: block;
}

/* --------------------------------------------------------------------------
   フッター
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: #17222B;
  color: #D3CCC4;
  padding-top: 4.5rem;
  padding-bottom: 2.5rem;
  font-size: 0.95rem;
  border-top: 3px solid var(--color-gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand-title {
  font-size: 1.5rem;
  color: #FFFFFF;
  margin-bottom: 0.75rem;
}

.footer-disclaimer-box {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-top: 1.25rem;
  line-height: 1.75;
  font-size: 0.92rem;
}

.footer-disclaimer-title {
  color: var(--color-gold);
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.footer-info-block h4 {
  font-size: 1.1rem;
  color: #FFFFFF;
  margin-bottom: 1rem;
  border-left: 3px solid var(--color-gold);
  padding-left: 0.6rem;
}

.footer-info-block p {
  line-height: 1.8;
  margin-bottom: 0.75rem;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.88rem;
  color: #9E968D;
}

.back-to-top-btn {
  background: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  padding: 0.5rem 1.25rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.back-to-top-btn:hover {
  background-color: var(--color-gold);
  border-color: var(--color-gold);
  color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   レスポンシブ対応
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .about-overview-box {
    padding: 2rem 1.5rem;
  }

  .about-features-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

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

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  :root {
    --font-base-size: 17px;
  }

  html[data-font-size="large"] {
    --font-base-size: 20px;
  }

  .section-block {
    padding-top: 3.5rem;
    padding-bottom: 3.5rem;
  }

  .nav-desktop,
  .header-cta-btn {
    display: none;
  }

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

  .hero-section {
    padding-top: 3rem;
    padding-bottom: 3.5rem;
  }

  .hero-section::before {
    background: linear-gradient(
      180deg,
      rgba(250, 247, 242, 0.97) 0%,
      rgba(250, 247, 242, 0.94) 60%,
      rgba(250, 247, 242, 0.88) 100%
    );
  }

  .hero-heading {
    font-size: 1.85rem;
  }

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

  .info-table th,
  .info-table td {
    display: block;
    width: 100%;
    padding: 1rem;
  }

  .info-table th {
    border-bottom: none;
    padding-bottom: 0.4rem;
  }

  .info-table tr {
    display: block;
    border-bottom: 1px solid var(--border-light);
  }

  .step-guidelines-card {
    padding: 1.5rem 1.25rem;
  }

  .guidelines-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .faq-answer {
    padding-left: 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}