/* pp-storybook.css — page-flip edition */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: #f4f0eb;
  color: #2c3e50;
  line-height: 1.6;
  min-height: 100vh;
}

/* --- Header --- */
.book-header, .story-header {
  max-width: 700px;
  margin: 0 auto;
  padding: 1.5rem 1rem 0.5rem;
  text-align: center;
}
.book-header h1 { font-size: 1.8rem; color: #c0392b; font-family: 'Nunito', 'Noto Sans SC', sans-serif; font-weight: 700; }
.book-subtitle { font-size: 0.95rem; color: #7f8c8d; margin-top: 0.3rem; }
.book-desc { font-size: 0.85rem; color: #95a5a6; margin-top: 0.2rem; }
.back-link {
  display: inline-block; margin-bottom: 0.3rem;
  color: #3498db; text-decoration: none; font-size: 0.8rem;
}
.story-header h1 {
  font-size: 1.3rem; color: #2c3e50;
  border-bottom: 2px solid #f39c12; padding-bottom: 0.4rem;
  font-family: 'Nunito', 'Noto Sans SC', sans-serif;
  font-weight: 700;
}

/* --- Page-flip viewport --- */
.flip-viewport {
  max-width: 640px;
  margin: 0.8rem auto;
  padding: 0 0.8rem;
}

.flip-pages { position: relative; }

.story-page {
  display: none;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 20px rgba(0,0,0,0.07);
  overflow: hidden;
}

.story-page.active {
  display: block;
  animation: fadeSlideIn 0.25s ease-out;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* --- Image area with page number overlay --- */
.page-illustration {
  position: relative;
  width: 100%;
  background: #faf8f5;
}

.page-illustration img {
  width: 100%;
  height: auto;
  display: block;
}

.page-number {
  position: absolute;
  bottom: 10px;
  right: 12px;
  font-size: 0.75rem;
  color: #fff;
  background: rgba(0,0,0,0.35);
  padding: 2px 10px;
  border-radius: 10px;
  font-family: 'Nunito', 'Helvetica Neue', Arial, sans-serif;
  letter-spacing: 0.5px;
  backdrop-filter: blur(4px);
  font-weight: 700;
}

/* --- Text area --- */
.page-text {
  padding: 0.8rem 1rem 0.6rem;
}

.story-dialogue {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 2.5rem;
  line-height: 1.3;
  color: #2c3e50;
  font-family: 'Nunito', sans-serif;
  font-weight: 300;
}

.dialogue-text {
  flex: 1;
}

.dialogue-text strong { color: #e74c3c; font-weight: 700; }

/* --- TTS button inline at end of text --- */
.tts-btn {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border: 2.5px solid #3498db;
  background: #fff;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.85rem;
  color: #3498db;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.tts-btn:hover { background: #3498db; color: #fff; }
.tts-btn.speaking { background: #e74c3c; border-color: #e74c3c; color: #fff; }

/* --- Flip bar --- */
.flip-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.7rem;
  background: #fff;
  border-top: 1px solid #eee;
}

.flip-btn {
  width: 36px;
  height: 36px;
  border: 2px solid #bdc3c7;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  font-size: 0.9rem;
  color: #7f8c8d;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  font-family: 'Nunito', sans-serif;
}

.flip-btn:hover:not(:disabled) { border-color: #3498db; color: #3498db; background: #f0f7ff; }
.flip-btn:disabled { opacity: 0.3; cursor: default; }

.flip-indicator {
  font-size: 0.95rem;
  color: #2c3e50;
  min-width: 1.5rem;
  text-align: center;
}

.flip-sep { color: #bdc3c7; font-size: 0.95rem; }

/* --- Vocabulary footer --- */
.story-footer {
  max-width: 640px;
  margin: 1rem auto;
  padding: 1rem 1.2rem;
  background: #f8f6f3;
  border-radius: 8px;
}

.story-footer h3 { font-size: 0.95rem; margin-bottom: 0.4rem; color: #7f8c8d; }
.story-footer ul { list-style: none; }
.story-footer li { padding: 0.15rem 0; font-size: 0.85rem; color: #555; }
.story-footer li strong { color: #2c3e50; }

.story-nav-bottom {
  display: flex;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 0.8rem;
  border-top: 1px solid #ddd;
}

.story-nav-bottom a { color: #3498db; text-decoration: none; font-size: 0.85rem; }
.story-nav-bottom a:hover { text-decoration: underline; }

/* --- List page --- */
.story-index { max-width: 700px; margin: 1.5rem auto; padding: 0 1rem; }
.story-index h2 { font-size: 1.1rem; margin-bottom: 1rem; color: #7f8c8d; }

.story-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.8rem;
}

.story-card {
  display: block;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s, box-shadow 0.15s;
  overflow: hidden;
}

.story-card:hover { transform: translateY(-2px); box-shadow: 0 4px 14px rgba(0,0,0,0.1); }

.card-body { padding: 0.8rem; }
.card-body h3 { font-size: 0.95rem; color: #2c3e50; }
.card-meta { font-size: 0.75rem; color: #95a5a6; margin-top: 0.2rem; }

.card-cover {
  background: #f0ece6;
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}

.card-cover-img {
  width: auto;
  height: 100%;
  max-width: 100%;
  object-fit: contain;
  display: block;
  border-radius: 4px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

.book-footer {
  max-width: 700px;
  margin: 1.5rem auto;
  padding: 1rem;
  text-align: center;
  font-size: 0.8rem;
  color: #95a5a6;
}

/* --- Responsive fine-tuning --- */
@media (min-width: 480px) {
  .story-header h1 { font-size: 1.5rem; }
  .story-dialogue { font-size: 2.75rem; }
  .page-text { padding: 1rem 1.5rem 0.8rem; }
}