/**
 * 作品翻书弹层（#flipbook-modal）
 * 与 flipbook-turnjs-demo 视觉策略一致：白底、无书容器阴影，与 turn.js 空白半幅融合
 */

#flipbook-modal .fb-loading {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
}

#flipbook-modal .fb-spinner {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 3px solid rgba(0, 0, 0, 0.08);
  border-top-color: #ea580c;
  animation: fb-spin 0.85s linear infinite;
}

@keyframes fb-spin {
  to {
    transform: rotate(360deg);
  }
}

#flipbook-modal #modal-turn-wrapper {
  width: 100%;
  height: min(62vh, 560px);
  position: relative;
  transform: translateZ(0);
  backface-visibility: hidden;
  border-radius: 4px;
  background: #ffffff;
  box-shadow: none;
}

#flipbook-modal #modal-flipbook {
  width: 100%;
  height: 100%;
  background: #ffffff;
}

/* turn.js 生成的页面包一层，统一白底避免露灰 */
#flipbook-modal .turn-page {
  background-color: #ffffff;
}

#flipbook-modal .page img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  -webkit-user-drag: none;
  pointer-events: none;
}

#flipbook-modal .hard {
  background: #e5e7eb;
}

#flipbook-modal .fb-control-btn {
  appearance: none;
  border: 1px solid #fdba74;
  background: linear-gradient(180deg, #fff7ed 0%, #ffedd5 100%);
  color: #171717;
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}

#flipbook-modal .fb-control-btn:hover:not(:disabled) {
  background: linear-gradient(180deg, #ffedd5 0%, #fed7aa 100%);
  box-shadow: 0 2px 8px rgba(234, 88, 12, 0.2);
}

#flipbook-modal .fb-control-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* 弹层内滚动：减轻 overflow-anchor 抖动；隐藏滚动条保留滚动 */
#flipbook-modal .fb-modal-scroll {
  overflow-anchor: none;
  overscroll-behavior: contain;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

#flipbook-modal .fb-modal-scroll::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;
}

#flipbook-modal .fb-hint {
  font-size: 0.75rem;
  color: #525252;
  text-align: center;
  max-width: 36rem;
  line-height: 1.6;
}

#flipbook-modal .fb-hint kbd {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  margin: 0 0.15rem;
  font-size: 0.7rem;
  color: #262626;
  background: #f5f5f5;
  border: 1px solid #e5e5e5;
  border-radius: 4px;
}