/* ============================================================
   Treatment Showcase セクション — フルリデザイン (2026 redesign v2)
   3カード均等グリッドから、蛇行タイムライン(左右交互)+接続ライン+
   大型ビジュアルへ。ストーリーを辿るような読み進め方に変更。
   ============================================================ */
.treatment-showcase {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
}

/* 背景装飾: 上下に大きな斜めのブランドカラー帯 */
.treatment-showcase::before {
  content: '';
  position: absolute;
  top: 0;
  right: -10%;
  width: 55%;
  height: 140%;
  background: linear-gradient(180deg, color-mix(in srgb, var(--color-primary) 7%, transparent), transparent 60%);
  transform: rotate(8deg);
  pointer-events: none;
  z-index: 0;
}

.treatment-showcase .container { position: relative; z-index: 1; }

.treatment-showcase__head {
  max-width: 640px;
  margin: 0 0 clamp(3rem, 6vw, 5rem);
  text-align: left;
}
.treatment-showcase__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: var(--fs-small);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: 1rem;
}
.treatment-showcase__eyebrow::before {
  content: '';
  display: block;
  width: 28px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}
.treatment-showcase .section-title { margin-bottom: 0; }
.treatment-showcase .section-title::after { margin-left: 0; }

/* ── タイムライン構造 ── */
.treatment-showcase__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  position: relative;
}

/* 中央の縦接続ライン（PC時） */
.treatment-showcase__grid::before {
  content: '';
  position: absolute;
  top: 2rem;
  bottom: 2rem;
  left: 50%;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    color-mix(in srgb, var(--color-primary) 45%, transparent) 0,
    color-mix(in srgb, var(--color-primary) 45%, transparent) 8px,
    transparent 8px,
    transparent 16px
  );
  transform: translateX(-50%);
  z-index: 0;
}

.treatment-showcase__card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
  position: relative;
  padding: clamp(2rem, 4vw, 3rem) 0;
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
}
.treatment-showcase__card:not(:last-child) {
  margin-bottom: 0;
}

/* 偶数カードは左右反転（蛇行） */
.treatment-showcase__card:nth-child(even) { direction: rtl; }
.treatment-showcase__card:nth-child(even) > * { direction: ltr; }

/* 中央強調カード(featured)も同一構造に統一しつつ視覚的重みを追加 */
.treatment-showcase__card--featured .treatment-showcase__media img {
  box-shadow: 0 34px 70px -24px color-mix(in srgb, var(--color-primary) 45%, rgba(0,0,0,0.35));
}

.treatment-showcase__media {
  position: relative;
  z-index: 1;
}
.treatment-showcase__media img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  max-height: none;
  border-radius: var(--radius-card);
  box-shadow: 0 24px 50px -20px rgba(0,0,0,0.28);
}

/* ナンバリング: 接続ライン上の円形バッジに変更 */
.treatment-showcase__num {
  position: absolute;
  top: -14px;
  left: -14px;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-on-primary);
  background: var(--color-primary);
  border-radius: 50%;
  border: 4px solid var(--color-bg);
  box-shadow: 0 8px 18px -6px color-mix(in srgb, var(--color-primary) 60%, transparent);
  z-index: 2;
}
.treatment-showcase__card:nth-child(even) .treatment-showcase__num {
  left: auto;
  right: -14px;
}

.treatment-showcase__body {
  position: relative;
  z-index: 1;
  padding: 0;
}
.treatment-showcase__body h3 {
  font-size: var(--fs-mod-title);
  color: var(--color-heading-ink);
  margin-bottom: 1rem;
  line-height: 1.5;
  position: relative;
  padding-left: 1.1rem;
  border-left: 3px solid var(--color-primary);
}
.treatment-showcase__body p {
  font-size: var(--fs-body);
  line-height: 1.9;
  color: var(--color-text-muted);
  margin-bottom: 0.9rem;
}
.treatment-showcase__body p:last-of-type { margin-bottom: 1.5rem; }

.treatment-showcase__link {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--color-heading-ink);
}
.treatment-showcase__link span { position: relative; }
.treatment-showcase__link span::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0.3);
  transform-origin: left;
  transition: transform 0.35s ease;
}
.treatment-showcase__link svg {
  flex: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1.5px solid var(--color-primary);
  color: var(--color-primary);
  padding: 3px;
  box-sizing: border-box;
  transition: transform 0.35s ease, background 0.35s ease, color 0.35s ease;
}
.treatment-showcase__link:hover { opacity: 1; }
.treatment-showcase__link:hover span::after { transform: scaleX(1); }
.treatment-showcase__link:hover svg {
  background: var(--color-primary);
  color: var(--color-on-primary);
  transform: translateX(4px);
}

@media (max-width: 900px) {
  .treatment-showcase__grid::before { left: 26px; transform: none; }
  .treatment-showcase__card,
  .treatment-showcase__card:nth-child(even) {
    grid-template-columns: 1fr;
    direction: ltr;
    padding-left: 3.25rem;
  }
  .treatment-showcase__card:nth-child(even) > * { direction: ltr; }
  .treatment-showcase__num,
  .treatment-showcase__card:nth-child(even) .treatment-showcase__num {
    left: 0;
    right: auto;
    top: 0;
    width: 48px;
    height: 48px;
    font-size: 1rem;
  }
  .treatment-showcase__media { margin-top: 0.5rem; }
}