/* Bilingual Picture Book Reader - Styles */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #FFF8F0;
  --card-bg: #FFFFFF;
  --accent: #FF8C42;
  --accent2: #FFD166;
  --text: #3D2C1E;
  --text-light: #7A6555;
  --highlight: #FFE0B2;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --radius: 20px;
}

body {
  font-family: 'Nunito', 'PingFang SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* HOME */
.home { padding: 24px 16px; }
.home-title {
  font-size: 2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 28px;
  color: var(--accent);
}

.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: repeat(4, auto);
  max-width: 700px;
  margin: 0 auto;
  gap: 16px;
}

.category-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}
.category-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}
.category-card:active { transform: translateY(0); }

.card-cover {
  width: 100%;
  height: 150px;
  object-fit: cover;
  background: var(--highlight);
}

.card-info { padding: 12px 12px 14px; }
.card-category {
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}
.card-title { font-size: 1.2rem; font-weight: 800; margin-bottom: 2px; }
.card-title-zh { font-size: 0.9rem; color: var(--text-light); margin-bottom: 6px; }
.card-pages { font-size: 0.8rem; color: var(--text-light); }

/* Multi-story category card */
.category-card.multi { flex-direction: column; align-items: stretch; gap: 12px; }
.multi-covers {
  display: flex;
  gap: 8px;
}
.multi-covers .card-cover {
  width: 140px;
  height: 94px;
}
.multi-story-list {
  border-top: 2px solid var(--border);
  padding-top: 10px;
  margin-top: 4px;
}
.story-choice {
  padding: 8px 4px;
  cursor: pointer;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  transition: background 0.15s;
}
.story-choice:hover { background: var(--highlight); }
.story-choice-en { font-size: 0.8rem; color: var(--text-light); margin-left: 6px; }
.story-choice-pages { font-size: 0.75rem; color: var(--accent); margin-left: 6px; }

/* READER */
.reader {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.reader-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-back {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 30px;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
}

.reader-title {
  text-align: center;
  flex: 1;
}
.story-name { font-size: 1rem; font-weight: 700; display: block; }
.page-indicator { font-size: 0.8rem; color: var(--text-light); }

.speed-control {
  display: flex;
  align-items: center;
  gap: 8px;
  background: white;
  border-radius: 30px;
  padding: 4px 12px;
  box-shadow: var(--shadow);
}
.btn-speed {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  font-size: 1rem;
  cursor: pointer;
  font-family: inherit;
  line-height: 1;
}
#rate-display { font-weight: 700; font-size: 0.9rem; min-width: 32px; text-align: center; }

/* Story image - sticky at top */
.story-image-container {
  width: 100%;
  max-height: 280px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--highlight);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: sticky;
  top: 0;
  z-index: 10;
}
#story-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  max-height: 280px;
}

/* Text area - single big box: English sentence + Chinese + key words inline */
.text-area {
  background: white;
  border-radius: var(--radius);
  padding: 24px 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  overflow-y: auto;
  max-height: calc(100vh - 340px);
  scroll-behavior: smooth;
}
.en-text {
  font-size: 1.35rem;
  line-height: 2;
  margin-bottom: 14px;
  font-weight: 600;
  letter-spacing: 0.3px;
}
.en-text .word {
  display: inline;
  padding: 2px 0;
  border-radius: 4px;
  transition: background 0.1s;
}
.en-text .word.active {
  background: var(--highlight);
  color: #E65100;
}
.zh-text {
  font-size: 1.1rem;
  line-height: 1.9;
  color: var(--text-light);
  padding-top: 10px;
  border-top: 1px dashed #EEE;
}

.zh-text .zh-char.active, .zh-text .zh-word.active, .zh-text .zh-chunk.active {
  background: var(--highlight);
  color: #222;
  border-radius: 3px;
  padding: 0 1px;
}

.zh-text .zh-chunk {
  display: inline;
}

.zh-text .zh-chunk.active {
  background: var(--highlight);
  color: #222;
  border-radius: 3px;
}

/* Key Words - inline inside text-area */
.keys-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: 12px;
}
.key-word {
  background: var(--accent2);
  color: #5D4037;
  border-radius: 20px;
  padding: 3px 10px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.15s;
  display: inline;
}
.key-word.active {
  background: var(--highlight);
  color: #E65100;
  transform: scale(1.08);
}
.phonetic { color: #8D6E63; margin: 0 2px; }

/* Controls */
.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.btn-nav {
  background: white;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: 30px;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s;
}
.btn-nav:active { background: var(--accent); color: white; }

.btn-play {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 50px;
  padding: 14px 32px;
  font-size: 1.1rem;
  font-weight: 800;
  cursor: pointer;
  font-family: inherit;
  box-shadow: 0 4px 15px rgba(255,140,66,0.4);
  min-width: 140px;
}
.btn-play:active { transform: scale(0.97); }

/* Page dots */
.page-dots {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  padding: 10px 0;
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #DDD;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}
.dot.active { background: var(--accent); transform: scale(1.3); }
.dot:hover { background: var(--accent2); }