/**
 * 車絵本 Flipbook Styles
 * noaere pre の ehon-flipbook.css を参考に簡易実装
 */

.car-flipbook {
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
}

/* 本のコンテナ */
.car-flipbook__book {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: 12px;
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.07),
    0 12px 28px rgba(0, 0, 0, 0.15),
    0 20px 40px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  perspective: 1500px;
  background: #f5f5f5;
  transition: aspect-ratio 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 3D空間 */
.car-flipbook__scene {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  visibility: hidden;
}

/* ページ共通 */
.car-flipbook__page {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform-origin: left center;
  transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.3s ease;
  transform-style: preserve-3d;
}

/* ページがめくられた状態 */
.car-flipbook__page--flipped {
  transform: rotateY(-180deg);
}

/* ページの表面 */
.car-flipbook__page-front {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 0 8px 8px 0;
  box-shadow: inset 12px 0 16px -10px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  background: #fff;
}

.car-flipbook__page-front img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ページの裏面 */
.car-flipbook__page-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, #f5f3ef 0%, #fdfcfa 100%);
  transform: rotateY(180deg);
  backface-visibility: hidden;
  border-radius: 8px 0 0 8px;
  box-shadow: inset -12px 0 16px -10px rgba(0, 0, 0, 0.1);
}

/* ナビゲーション */
.car-flipbook__nav {
  position: absolute;
  bottom: 16px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px;
  pointer-events: none;
  z-index: 10;
}

.car-flipbook__nav-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  cursor: pointer;
  transition: all 0.2s ease;
  color: #444;
  pointer-events: auto;
}

.car-flipbook__nav-btn:hover:not(:disabled) {
  background: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
  transform: scale(1.05);
}

.car-flipbook__nav-btn:active:not(:disabled) {
  transform: scale(0.95);
}

.car-flipbook__nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.car-flipbook__page-indicator {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: #fff;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 8px 16px;
  border-radius: 20px;
  pointer-events: auto;
}

/* 見開き切り替えボタン */
.car-flipbook__spread-btn {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  border: none;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  color: #666;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.car-flipbook__spread-btn:hover {
  background: #fff;
  color: #333;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* 見開きモード */
.car-flipbook--spread .car-flipbook__book {
  aspect-ratio: 2 / 1;
}

.car-flipbook--spread .car-flipbook__scene {
  display: flex;
}

.car-flipbook--spread .car-flipbook__page {
  position: relative;
  width: 50%;
  height: 100%;
  transform-origin: center center;
  transition: opacity 0.3s ease, width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.car-flipbook--spread .car-flipbook__page--flipped {
  transform: none;
}

.car-flipbook--spread .car-flipbook__page-back {
  display: none;
}

/* 見開き時の左ページ */
.car-flipbook--spread .car-flipbook__page--left .car-flipbook__page-front {
  border-radius: 8px 0 0 8px;
}

/* 見開き時の右ページ */
.car-flipbook--spread .car-flipbook__page--right .car-flipbook__page-front {
  border-radius: 0 8px 8px 0;
}

/* スマホ対応 */
@media (max-width: 480px) {
  .car-flipbook__nav {
    padding: 0 12px;
    bottom: 12px;
  }

  .car-flipbook__nav-btn {
    width: 40px;
    height: 40px;
  }

  .car-flipbook__spread-btn {
    top: 8px;
    left: 8px;
    padding: 6px 12px;
    font-size: 11px;
  }
}

/* PC - 最大幅制限 */
@media (min-width: 768px) {
  .car-flipbook {
    max-width: 500px;
  }

  .car-flipbook--spread {
    max-width: 800px;
  }
}

/* ページラベル（オプション） */
.car-flipbook__page-label {
  position: absolute;
  bottom: 8px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 11px;
  color: rgba(0, 0, 0, 0.5);
  background: rgba(255, 255, 255, 0.8);
  padding: 4px 8px;
}