/* ============================================================
   CULTURE HERO — カルチャーページ ファーストビュー
   背景: ダーク（navy-deep #0D1B2E + グラデーション装飾）
   高さ: 100vh（最低 640px）
   アニメーション: rv-system（GSAPなし — サブページ）
   ============================================================ */

/* ---- Section Base ---- */
.culture-hero {
  position: relative;
  z-index: var(--z-content, 10);
  background-color: var(--c-navy-deep, #0D1B2E);
  min-height: max(100vh, 640px);
  display: flex;
  align-items: center;
  overflow: hidden;
}

/* ============================================================
   背景レイヤー
   ============================================================ */
.culture-hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* グリッドパターン（微細・透明） */
.culture-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ゴールドフレア（右上） */
.culture-hero__flare--gold {
  position: absolute;
  top: -180px;
  right: -80px;
  width: 650px;
  height: 650px;
  background: radial-gradient(
    circle,
    rgba(201, 168, 76, 0.16) 0%,
    rgba(201, 168, 76, 0.05) 45%,
    transparent 70%
  );
  animation: culture-hero-flare-gold 9s ease-in-out infinite;
}

@keyframes culture-hero-flare-gold {
  0%, 100% { transform: scale(1) translate(0, 0); opacity: 0.7; }
  50%       { transform: scale(1.1) translate(-25px, 18px); opacity: 1; }
}

/* ブルーフレア（左下） */
.culture-hero__flare--blue {
  position: absolute;
  bottom: -120px;
  left: -80px;
  width: 550px;
  height: 550px;
  background: radial-gradient(
    circle,
    rgba(74, 144, 217, 0.10) 0%,
    rgba(43, 90, 143, 0.05) 45%,
    transparent 70%
  );
  animation: culture-hero-flare-blue 11s ease-in-out infinite;
}

@keyframes culture-hero-flare-blue {
  0%, 100% { transform: scale(1) translate(0, 0); opacity: 0.6; }
  50%       { transform: scale(1.07) translate(18px, -18px); opacity: 0.9; }
}

/* 底部フェード（次セクションとのつなぎ） */
.culture-hero__fade-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to bottom, transparent, rgba(13, 27, 46, 0.55));
}

/* ============================================================
   コンテナ
   ============================================================ */
.culture-hero__container {
  position: relative;
  z-index: 1;
  max-width: var(--s-container, 1200px);
  width: 100%;
  margin: 0 auto;
  padding: calc(var(--s-header-h, 80px) + 64px) var(--s-gutter, 32px) 120px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

/* ============================================================
   コンテンツ
   ============================================================ */
.culture-hero__content {
  max-width: 720px;
}

/* ---- eyebrow ---- */
.culture-hero__eyebrow {
  font-family: var(--f-label, 'Inter', sans-serif);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin: 0 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.culture-hero__eyebrow::before {
  content: '';
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--c-gold);
  flex-shrink: 0;
}

/* ---- タイトル ---- */
.culture-hero__title {
  font-family: var(--f-heading-ja, 'Noto Serif JP', serif);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.3;
  color: #FFFFFF;
  margin: 0 0 28px;
  letter-spacing: 0.02em;
}

.culture-hero__title-line {
  display: block;
}

/* ---- サブコピー ---- */
.culture-hero__subtitle {
  font-family: var(--f-body, 'Noto Sans JP', sans-serif);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  font-weight: 400;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.72);
  margin: 0 0 48px;
  letter-spacing: 0.04em;
}

/* ============================================================
   CTA
   ============================================================ */
.culture-hero__cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

/* ボタン */
.culture-hero__btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--c-gold);
  color: var(--c-navy-deep, #0D1B2E);
  font-family: var(--f-body, 'Noto Sans JP', sans-serif);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  padding: 16px 36px;
  border-radius: 4px;
  transition:
    background var(--t-base, 0.4s) var(--ease-out, ease-out),
    transform var(--t-base, 0.4s) var(--ease-out, ease-out),
    box-shadow var(--t-base, 0.4s) var(--ease-out, ease-out);
}

.culture-hero__btn:hover {
  background: var(--c-gold-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201, 168, 76, 0.35);
}

.culture-hero__btn-arrow {
  font-size: 1.1em;
  transition: transform var(--t-base, 0.4s) var(--ease-out, ease-out);
}

.culture-hero__btn:hover .culture-hero__btn-arrow {
  transform: translateX(4px);
}

/* CTAノート */
.culture-hero__cta-note {
  font-family: var(--f-body, 'Noto Sans JP', sans-serif);
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.42);
  margin: 0;
  letter-spacing: 0.06em;
}

/* ============================================================
   スクロールインジケーター
   ============================================================ */
.culture-hero__scroll {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: culture-hero-scroll-bounce 2s ease-in-out infinite;
}

@keyframes culture-hero-scroll-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(6px); }
}

.culture-hero__scroll-text {
  font-family: var(--f-label, 'Inter', sans-serif);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.32);
}

.culture-hero__scroll-line {
  display: block;
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(201, 168, 76, 0.6), transparent);
  animation: culture-hero-scroll-line 2s ease-in-out infinite;
}

@keyframes culture-hero-scroll-line {
  0%   { transform: scaleY(0); transform-origin: top; opacity: 0; }
  50%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
  100% { transform: scaleY(1); transform-origin: bottom; opacity: 0; }
}

/* ============================================================
   レスポンシブ
   ============================================================ */
@media (max-width: 1024px) {
  .culture-hero__container {
    padding-left: 28px;
    padding-right: 28px;
  }

  .culture-hero__title {
    font-size: clamp(2rem, 4.5vw, 3rem);
  }
}

@media (max-width: 768px) {
  .culture-hero {
    min-height: 90vh;
  }

  .culture-hero__container {
    padding: calc(var(--s-header-h, 80px) + 48px) 20px 100px;
    align-items: flex-start;
  }

  .culture-hero__content {
    max-width: 100%;
  }

  .culture-hero__title {
    font-size: clamp(1.9rem, 7.5vw, 2.8rem);
    margin-bottom: 22px;
  }

  .culture-hero__subtitle {
    font-size: 0.95rem;
    margin-bottom: 36px;
  }

  .culture-hero__btn {
    font-size: 0.95rem;
    padding: 14px 28px;
  }

  .culture-hero__flare--gold {
    width: 380px;
    height: 380px;
    top: -80px;
    right: -60px;
  }

  .culture-hero__flare--blue {
    width: 320px;
    height: 320px;
  }
}

@media (max-width: 480px) {
  .culture-hero__title {
    font-size: clamp(1.7rem, 9vw, 2.2rem);
  }

  .culture-hero__eyebrow {
    font-size: 0.7rem;
  }

  .culture-hero__btn {
    width: 100%;
    justify-content: center;
  }
}