/* ===========================
   INTRODUCTION PAGE
=========================== */

/* ページヒーロー */
.page-hero {
  padding: 160px 0 80px;
  background: linear-gradient(160deg, #0f0f0f 0%, #1a1a1a 60%, #0a0a0a 100%);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 80%, rgba(201, 168, 76, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.page-hero__label {
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.35em;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.page-hero__title {
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 24px;
}

.page-hero__desc {
  font-size: clamp(14px, 1.8vw, 16px);
  color: var(--color-text-muted);
  line-height: 1.9;
}

/* 現在ページハイライト */
.header__nav-list a.is-current {
  color: var(--color-primary);
}

/* ===========================
   CASE SECTIONS
=========================== */
.case-section {
  padding: 100px 0;
  border-bottom: 1px solid var(--color-border);
}

.case-section:nth-child(odd) {
  background-color: var(--color-bg);
}

.case-section:nth-child(even) {
  background-color: var(--color-bg-2);
}

.case-section__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

/* 偶数：画像を左に */
.case-section--reverse .case-section__inner {
  direction: rtl;
}
.case-section--reverse .case-section__inner > * {
  direction: ltr;
}

/* 画像エリア */
.case-section__image {
  position: relative;
}

.case-section__image-wrap {
  position: relative;
  aspect-ratio: 4/3;
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-bg-3);
  border: 1px solid var(--color-border);
  z-index: 1;
}

.case-section__image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.case-section:hover .case-section__image-wrap img {
  transform: scale(1.04);
}

/* 画像なしフォールバック */
.case-section__image-wrap.no-image::after {
  content: 'PHOTO';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--color-text-muted);
}

/* ゴールドアクセント装飾 */
.case-section__image-accent {
  position: absolute;
  bottom: -16px;
  right: -16px;
  width: 60%;
  height: 60%;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  opacity: 0.25;
  z-index: 0;
  transition: opacity var(--transition);
}

.case-section--reverse .case-section__image-accent {
  right: auto;
  left: -16px;
}

.case-section:hover .case-section__image-accent {
  opacity: 0.45;
}

/* コンテンツエリア */
.case-badge {
  display: inline-block;
  font-family: var(--font-ja);
  font-size: 11px;
  font-weight: 700;
  background-color: var(--color-primary);
  color: #000;
  padding: 4px 12px;
  border-radius: 2px;
  margin-bottom: 20px;
  letter-spacing: 0.05em;
}

.case-section__title {
  font-size: clamp(22px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 20px;
}

.case-section__text {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.95;
}

/* ===========================
   注釈
=========================== */
.cases-note {
  padding: 24px 0;
  background-color: var(--color-bg-2);
  border-bottom: 1px solid var(--color-border);
}

.cases-note p {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 768px) {
  .page-hero {
    padding: 120px 0 60px;
  }

  .case-section {
    padding: 72px 0;
  }

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

  /* SP: 逆順レイアウト解除、画像は常にテキストの後 */
  .case-section--reverse .case-section__inner {
    direction: ltr;
  }

  .case-section__image {
    order: 1;
  }

  .case-section__content {
    order: 0;
  }

  .case-section__image-accent {
    bottom: -10px;
    right: -10px;
  }

  .case-section--reverse .case-section__image-accent {
    left: -10px;
  }
}