/* ===================================
   アニメーション定義
   =================================== */

/* フェードイン（基本） */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 方向バリエーション */
.fade-in--up {
  transform: translateY(40px);
}

.fade-in--left {
  transform: translateX(-40px) translateY(0);
}

.fade-in--right {
  transform: translateX(40px) translateY(0);
}

.fade-in--left.is-visible,
.fade-in--right.is-visible {
  transform: translateX(0) translateY(0);
}

/* スケールイン */
.fade-in--scale {
  transform: scale(0.95) translateY(0);
}

.fade-in--scale.is-visible {
  transform: scale(1) translateY(0);
}

/* マスクリビール */
.reveal {
  position: relative;
  overflow: hidden;
}

.reveal::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-bg);
  transform: scaleX(1);
  transform-origin: right;
  transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.is-visible::after {
  transform: scaleX(0);
  transform-origin: left;
}

/* === prefers-reduced-motion 対応 === */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }

  .reveal::after {
    transform: scaleX(0);
  }
}