/* ================================================================
   initiatives.css - お客様との取り組みページ
   - ページヒーロー
   - リードセクション
   - ギャラリーグリッド (INI-001)
   - ライトボックス (INI-001)
   - フィルター
   - CTAセクション
   ================================================================ */

/* ----------------------------------------------------------------
   1. ページヒーロー（work.htmlと共通パターン）
   ---------------------------------------------------------------- */
.page-hero {
  position: relative;
  height: 480px;
  margin-top: var(--header-height);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-hero__bg {
  position: absolute;
  inset: 0;
}

.page-hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.05);
  transition: transform 8s ease;
}

.page-hero:hover .page-hero__image {
  transform: scale(1);
}

.page-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(26, 60, 94, 0.5) 0%,
    rgba(26, 42, 58, 0.75) 100%
  );
}

.page-hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-text-white);
  padding: 0 var(--spacing-md);
  animation: heroFadeUp 0.9s ease both;
}

@keyframes heroFadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.page-hero__label {
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: var(--spacing-sm);
}

.page-hero__title {
  font-family: var(--font-heading);
  font-size: var(--font-size-xxl);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

.page-hero__description {
  font-size: var(--font-size-md);
  line-height: 1.8;
  opacity: 0.9;
  font-weight: 300;
}

/* パンくずリスト */
.breadcrumb {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  white-space: nowrap;
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.breadcrumb__item {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.05em;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: '›';
  margin-right: var(--spacing-xs);
  opacity: 0.7;
}

.breadcrumb__item a {
  color: rgba(255, 255, 255, 0.75);
  transition: color var(--transition-fast);
}

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

/* ----------------------------------------------------------------
   2. リードセクション
   ---------------------------------------------------------------- */
.initiatives-lead {
  padding: var(--spacing-xxl) 0;
  background: var(--color-bg);
}

.initiatives-lead__inner {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.initiatives-lead__title {
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.5;
  margin-bottom: var(--spacing-md);
}

.initiatives-lead__text {
  font-size: var(--font-size-base);
  line-height: 2;
  color: var(--color-text-light);
}

/* ----------------------------------------------------------------
   3. ギャラリーセクション
   ---------------------------------------------------------------- */
.gallery-section {
  padding: var(--spacing-xxl) 0;
  background: var(--color-bg-dark);
}

/* フィルターボタン */
.gallery-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.gallery-filter__btn {
  padding: 0.5rem 1.5rem;
  border: 2px solid var(--color-border);
  border-radius: 50px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-light);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  letter-spacing: 0.05em;
}

.gallery-filter__btn:hover,
.gallery-filter__btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-white);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(26, 60, 94, 0.25);
}

/* ギャラリーグリッド */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

/* アイテム */
.gallery-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-text-white);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.gallery-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

/* アイテムが非表示状態（フィルター） */
.gallery-item.hidden {
  display: none;
}

.gallery-item__btn {
  display: block;
  width: 100%;
  text-align: left;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

/* 画像ラッパー */
.gallery-item__image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.gallery-item__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-item:hover .gallery-item__image {
  transform: scale(1.07);
}

/* ホバーオーバーレイ */
.gallery-item__overlay {
  position: absolute;
  inset: 0;
  background: rgba(26, 60, 94, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.gallery-item__btn:hover .gallery-item__overlay,
.gallery-item__btn:focus .gallery-item__overlay {
  opacity: 1;
}

.gallery-item__zoom-icon {
  width: 56px;
  height: 56px;
  border: 2px solid rgba(255,255,255,0.8);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
  transform: scale(0.8);
  transition: transform var(--transition-base);
}

.gallery-item__btn:hover .gallery-item__zoom-icon {
  transform: scale(1);
}

/* キャプション */
.gallery-item__caption {
  padding: var(--spacing-md);
}

.gallery-item__tag {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: rgba(200, 149, 108, 0.1);
  padding: 0.2rem 0.8rem;
  border-radius: 4px;
  margin-bottom: var(--spacing-xs);
}

.gallery-item__title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.4;
}

.gallery-item__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ----------------------------------------------------------------
   4. ライトボックス (INI-001)
   ---------------------------------------------------------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox[hidden] {
  display: none;
}

/* 背景オーバーレイ */
.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 18, 30, 0.92);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  cursor: pointer;
  animation: backdropIn 0.3s ease;
}

@keyframes backdropIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* コンテナ */
.lightbox__container {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  max-width: 1100px;
  width: 95%;
  padding: 0 var(--spacing-md);
  animation: lightboxIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes lightboxIn {
  from { opacity: 0; transform: scale(0.88); }
  to   { opacity: 1; transform: scale(1); }
}

/* 閉じるボタン */
.lightbox__close {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  color: white;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  line-height: 1;
}

.lightbox__close:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  transform: rotate(90deg);
}

/* 前後ナビゲーションボタン */
.lightbox__nav {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  color: white;
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  line-height: 1;
}

.lightbox__nav:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  transform: scale(1.1);
}

/* コンテンツ（画像 + 情報） */
.lightbox__content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  min-width: 0;
}

.lightbox__image {
  max-height: 70vh;
  max-width: 100%;
  width: auto;
  border-radius: var(--radius-md);
  object-fit: contain;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  transition: opacity 0.25s ease;
}

.lightbox__image.loading {
  opacity: 0.3;
}

/* キャプション情報 */
.lightbox__info {
  text-align: center;
  color: white;
}

.lightbox__tag {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-accent-light);
  margin-bottom: var(--spacing-xs);
}

.lightbox__title {
  font-size: var(--font-size-md);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.lightbox__desc {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.75);
  line-height: 1.7;
}

/* カウンター */
.lightbox__counter {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.1em;
}

/* ----------------------------------------------------------------
   5. CTAセクション
   ---------------------------------------------------------------- */
.initiatives-cta {
  padding: var(--spacing-xxl) 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
}

.initiatives-cta__inner {
  text-align: center;
  color: var(--color-text-white);
  max-width: 680px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.initiatives-cta__title {
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: var(--spacing-md);
}

.initiatives-cta__text {
  font-size: var(--font-size-base);
  line-height: 2;
  opacity: 0.85;
  margin-bottom: var(--spacing-lg);
}

.initiatives-cta__btns {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.initiatives-cta__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.85rem 2.2rem;
  border-radius: 50px;
  font-size: var(--font-size-base);
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: all var(--transition-base);
}

.initiatives-cta__btn--primary {
  background: var(--color-accent);
  color: var(--color-text-white);
}

.initiatives-cta__btn--primary:hover {
  background: var(--color-accent-light);
  color: var(--color-text-white);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(200, 149, 108, 0.45);
}

.initiatives-cta__btn--secondary {
  background: transparent;
  color: var(--color-text-white);
  border: 2px solid rgba(255,255,255,0.5);
}

.initiatives-cta__btn--secondary:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.8);
  color: var(--color-text-white);
  transform: translateY(-3px);
}

/* ----------------------------------------------------------------
   6. アクティブナビリンク
   ---------------------------------------------------------------- */
.header__nav-link--active {
  color: var(--color-accent) !important;
}

.header__nav-link--active::after {
  width: 100% !important;
}

/* ----------------------------------------------------------------
   7. レスポンシブ
   ---------------------------------------------------------------- */
@media (max-width: 1024px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-hero {
    height: 400px;
  }

  .lightbox__nav {
    width: 44px;
    height: 44px;
    font-size: 1.6rem;
  }
}

@media (max-width: 767px) {
  .page-hero {
    height: 320px;
  }

  .page-hero__title {
    font-size: var(--font-size-xl);
  }

  .page-hero__description {
    font-size: var(--font-size-sm);
  }

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

  .gallery-filter {
    gap: var(--spacing-xs);
  }

  .gallery-filter__btn {
    padding: 0.4rem 1rem;
    font-size: var(--font-size-xs);
  }

  .lightbox__container {
    gap: var(--spacing-xs);
    padding: 0 var(--spacing-xs);
  }

  .lightbox__nav {
    width: 40px;
    height: 40px;
    font-size: 1.4rem;
    flex-shrink: 0;
  }

  .lightbox__image {
    max-height: 55vh;
  }

  .initiatives-cta__btns {
    flex-direction: column;
    align-items: center;
  }

  .initiatives-cta__btn {
    width: 100%;
    justify-content: center;
  }
}