/* ============================================
   AI Personalized Storybook — Style
   小美的恐龍冒險
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;700;900&display=swap');

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #ff6f61;
  --primary-light: #ff9a8b;
  --bg-warm: #fff8e1;
  --text-dark: #3d2c2c;
  --text-medium: #5d4e4e;
  --text-light: #8a7a7a;
  --line-green: #06C755;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
}

html, body {
  height: 100%;
  font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-warm);
  color: var(--text-dark);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* ============================================
   Landing Page (index.html)
   ============================================ */

.landing {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
  background: linear-gradient(135deg, #fff8e1 0%, #ffe0b2 50%, #ffccbc 100%);
  text-align: center;
}

.landing-cover {
  width: 260px;
  height: 340px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, #ff6f61 0%, #ff9a8b 40%, #ffc3a0 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg), 0 2px 0 4px rgba(200,100,80,0.15);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.landing-cover::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -30%;
  width: 60%;
  height: 60%;
  background: rgba(255,255,255,0.15);
  border-radius: 50%;
}

.landing-cover .emoji-art {
  font-size: 80px;
  margin-bottom: 0.5rem;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.15));
}

.landing-cover h1 {
  color: white;
  font-size: 1.6rem;
  font-weight: 900;
  text-shadow: 0 2px 8px rgba(0,0,0,0.2);
  line-height: 1.3;
}

.landing-cover .subtitle {
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  margin-top: 0.3rem;
}

.landing-info {
  margin-bottom: 2rem;
}

.landing-info h2 {
  font-size: 1.3rem;
  color: var(--text-dark);
  margin-bottom: 0.3rem;
}

.landing-info p {
  color: var(--text-medium);
  font-size: 0.9rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 2rem;
  border: none;
  border-radius: 50px;
  font-size: 1.05rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  min-width: 240px;
}

.btn:active {
  transform: scale(0.96);
}

.btn-line {
  background: var(--line-green);
  color: white;
  box-shadow: 0 4px 16px rgba(6,199,85,0.3);
  margin-bottom: 0.8rem;
}

.btn-line:hover {
  background: #05b34d;
  box-shadow: 0 6px 24px rgba(6,199,85,0.4);
}

.btn-demo {
  background: white;
  color: var(--primary);
  border: 2px solid var(--primary-light);
  box-shadow: var(--shadow);
}

.btn-demo:hover {
  background: #fff0ee;
}

.landing-footer {
  margin-top: 2rem;
  color: var(--text-light);
  font-size: 0.95rem;
}

/* ============================================
   Book Reader (book.html)
   ============================================ */

.book-container {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

.pages-wrapper {
  display: flex;
  width: 100%;
  height: 100%;
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  will-change: transform;
}

.pages-wrapper.swiping {
  transition: none;
}

.page {
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  padding-bottom: 4.5rem;
  position: relative;
  overflow: hidden;
}

/* Illustration area */
.page-illustration {
  width: 100%;
  max-width: 360px;
  aspect-ratio: 4/3;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 2px 12px rgba(0,0,0,0.06), var(--shadow);
}

.page-illustration .emoji-scene {
  font-size: 64px;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.1));
  line-height: 1.4;
  text-align: center;
}

.page-illustration::before {
  content: '';
  position: absolute;
  width: 200%;
  height: 200%;
  top: -50%;
  left: -50%;
  background: radial-gradient(circle at 30% 40%, rgba(255,255,255,0.4) 0%, transparent 50%);
  animation: shimmer 8s ease-in-out infinite;
}

@keyframes shimmer {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(5%, 3%); }
}

/* Text areas */
.page-text {
  text-align: center;
  max-width: 480px;
  width: 100%;
}

.text-zh {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.9;
  color: var(--text-dark);
  margin-bottom: 0.8rem;
}

.text-en {
  font-size: 1.8rem;
  font-weight: 400;
  line-height: 1.9;
  color: var(--text-medium);
}

/* Cover page */
.page-cover .page-illustration {
  aspect-ratio: 3/4;
  max-width: 280px;
}

.page-cover .cover-title {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--text-dark);
  margin-bottom: 0.3rem;
}

.page-cover .cover-subtitle {
  font-size: 1.5rem;
  color: var(--text-medium);
  margin-bottom: 1rem;
}

.page-cover .cover-credits {
  font-size: 1.1rem;
  color: var(--text-light);
}

/* End page */
.page-end .end-text {
  font-size: 1rem;
  color: var(--text-medium);
  margin-top: 1rem;
}

.page-end .end-divider {
  font-size: 1.3rem;
  color: var(--text-light);
  margin: 1.2rem 0;
}

.page-end .end-credits {
  font-size: 1.1rem;
  color: var(--text-light);
  line-height: 1.8;
}

.page-end .end-brand {
  font-size: 0.95rem;
  color: var(--primary);
  font-weight: 700;
  margin-top: 0.5rem;
}

/* Toolbar */
.toolbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3.5rem;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid rgba(0,0,0,0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.2rem;
  z-index: 100;
}

.toolbar-btn {
  background: none;
  border: none;
  font-size: 1.3rem;
  padding: 0.4rem;
  cursor: pointer;
  border-radius: 8px;
  transition: background 0.15s;
  color: var(--text-medium);
}

.toolbar-btn:hover {
  background: rgba(0,0,0,0.05);
}

.toolbar-page {
  font-size: 0.85rem;
  color: var(--text-light);
  font-weight: 700;
}

/* Page progress dots */
/* Page turn animation */
.pages-wrapper.turning-right .page {
  animation: pageFlipRight 0.5s ease-out;
}
.pages-wrapper.turning-left .page {
  animation: pageFlipLeft 0.5s ease-out;
}
@keyframes pageFlipRight {
  0% { opacity: 0.7; transform: perspective(1200px) rotateY(-8deg) scale(0.95); }
  100% { opacity: 1; transform: perspective(1200px) rotateY(0deg) scale(1); }
}
@keyframes pageFlipLeft {
  0% { opacity: 0.7; transform: perspective(1200px) rotateY(8deg) scale(0.95); }
  100% { opacity: 1; transform: perspective(1200px) rotateY(0deg) scale(1); }
}

.progress-dots {
  display: flex;
  gap: 5px;
  align-items: center;
}

.progress-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(0,0,0,0.12);
  transition: all 0.3s ease;
  cursor: pointer;
}

.progress-dot:hover {
  background: rgba(0,0,0,0.3);
  transform: scale(1.2);
}

.progress-dot.active {
  background: var(--primary);
  width: 24px;
  border-radius: 6px;
}

/* Touch hint arrows */
.touch-hint {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: rgba(0,0,0,0.08);
  z-index: 50;
  pointer-events: none;
  transition: opacity 0.3s;
}

.touch-hint.left { left: 0.5rem; }
.touch-hint.right { right: 0.5rem; }

/* Page backgrounds */
.page-bg-1  { background: linear-gradient(160deg, #ff6f61 0%, #ff9a8b 40%, #ffc3a0 100%); }
.page-bg-2  { background: linear-gradient(160deg, #a8e063 0%, #c6f68d 40%, #f0fcd6 100%); }
.page-bg-3  { background: linear-gradient(160deg, #ffb347 0%, #ffcc80 40%, #fff3e0 100%); }
.page-bg-4  { background: linear-gradient(160deg, #56ccaa 0%, #88e8c8 40%, #d4f5e9 100%); }
.page-bg-5  { background: linear-gradient(160deg, #f48fb1 0%, #f8bbd0 40%, #fce4ec 100%); }
.page-bg-6  { background: linear-gradient(160deg, #64b5f6 0%, #90caf9 40%, #e3f2fd 100%); }
.page-bg-7  { background: linear-gradient(160deg, #e57373 0%, #ef9a9a 40%, #ffcdd2 60%, #90caf9 80%, #a5d6a7 100%); }
.page-bg-8  { background: linear-gradient(160deg, #00acc1 0%, #4dd0e1 40%, #e0f7fa 100%); }
.page-bg-9  { background: linear-gradient(160deg, #ff8a65 0%, #ffab91 30%, #ffe0b2 60%, #7e57c2 100%); }
.page-bg-10 { background: linear-gradient(160deg, #7e57c2 0%, #b39ddb 40%, #ede7f6 100%); }

/* Illustration backgrounds */
.illust-bg-1  { background: linear-gradient(135deg, #ff9a8b, #ffc3a0, #ffecd2); }
.illust-bg-2  { background: linear-gradient(135deg, #85d67e, #c6f68d, #f0fcd6); }
.illust-bg-3  { background: linear-gradient(135deg, #ffb347, #ffd180, #fff3e0); }
.illust-bg-4  { background: linear-gradient(135deg, #56ccaa, #a3e8cb, #e0f5ec); }
.illust-bg-5  { background: linear-gradient(135deg, #f48fb1, #f8bbd0, #fce4ec); }
.illust-bg-6  { background: linear-gradient(135deg, #64b5f6, #90caf9, #e3f2fd); }
.illust-bg-7  { background: linear-gradient(135deg, #ff7043, #ff8a65, #ffe082, #81c784, #64b5f6, #9575cd); }
.illust-bg-8  { background: linear-gradient(135deg, #0097a7, #4dd0e1, #b2ebf2); }
.illust-bg-9  { background: linear-gradient(135deg, #ff8a65, #ffab91, #b39ddb); }
.illust-bg-10 { background: linear-gradient(135deg, #5c35a5, #9575cd, #d1c4e9); }

/* Install banner */
.install-banner {
  position: fixed;
  bottom: 4rem;
  left: 50%;
  transform: translateX(-50%);
  background: white;
  padding: 0.8rem 1.5rem;
  border-radius: 50px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.8rem;
  z-index: 200;
  animation: slideUp 0.5s ease;
  font-size: 0.9rem;
}

.install-banner.hidden { display: none; }

.install-banner button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  font-size: 0.85rem;
}

.install-banner .dismiss {
  background: none;
  color: var(--text-light);
  padding: 0.4rem;
  font-size: 1.1rem;
}

@keyframes slideUp {
  from { transform: translate(-50%, 100%); opacity: 0; }
  to   { transform: translate(-50%, 0); opacity: 1; }
}

/* Responsive */
@media (min-width: 768px) {
  .page-illustration {
    max-width: 420px;
  }
  .text-zh {
    font-size: 2.4rem;
  }
  .text-en {
    font-size: 2.2rem;
  }
  .page-cover .cover-title {
    font-size: 3.5rem;
  }
}

@media (max-height: 600px) {
  .page-illustration {
    aspect-ratio: 16/9;
    margin-bottom: 0.8rem;
  }
  .text-zh {
    font-size: 1.1rem;
  }
  .text-en {
    font-size: 1.1rem;
  }
}

/* Language toggle bar */
/* Top controls bar */
.top-controls {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  z-index: 50;
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(8px);
}

.autoplay-toggle {
  background: rgba(255,255,255,0.8);
  border: 1px solid #dee2e6;
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 0.78rem;
  color: #6c757d;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}
.autoplay-toggle:hover { border-color: #ff6f61; color: #ff6f61; }
.autoplay-toggle.active {
  background: #ff6f61;
  color: #fff;
  border-color: #ff6f61;
}

.cover-version {
  margin-top: 8px;
  font-size: 0.72rem;
  color: rgba(0,0,0,0.3);
  letter-spacing: 0.05em;
}

.lang-toggle {
  display: flex;
  gap: 0;
}

.lang-toggle button {
  background: none;
  border: 1px solid rgba(0,0,0,0.12);
  padding: 0.35rem 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  color: var(--text-medium);
  transition: all 0.2s;
}

.lang-toggle button:first-child {
  border-radius: 20px 0 0 20px;
}

.lang-toggle button:last-child {
  border-radius: 0 20px 20px 0;
}

.lang-toggle button:not(:first-child) {
  border-left: none;
}

.lang-toggle button.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.lang-toggle button.active + button {
  border-left-color: var(--primary);
}

/* Hide text based on language mode */
body.lang-zh .text-en,
body.lang-zh .cover-subtitle { display: none !important; }
body.lang-en .text-zh,
body.lang-en .cover-title { display: none !important; }

/* Audio play button */
.toolbar-btn.audio-btn {
  position: relative;
}

.toolbar-btn.audio-btn.playing {
  color: var(--primary);
  animation: pulse-audio 1.5s ease-in-out infinite;
}

.toolbar-btn.autoplay-btn {
  font-size: 0.7rem;
  letter-spacing: -2px;
}
.toolbar-btn.autoplay-btn.active {
  color: var(--primary);
  background: rgba(255,111,97,0.15);
  border-radius: 50%;
}

@keyframes pulse-audio {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Audio player bar */
.audio-bar {
  position: fixed;
  bottom: 52px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-radius: 24px;
  padding: 6px 14px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.12);
  z-index: 60;
  max-width: 420px;
  width: calc(100% - 40px);
}
.audio-bar.hidden { display: none; }
.ab-btn {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: #495057;
  padding: 4px 6px;
  border-radius: 50%;
  line-height: 1;
}
.ab-btn:hover { background: rgba(0,0,0,0.06); }
.ab-close { font-size: 0.85rem; color: #adb5bd; }
.ab-time {
  font-size: 0.72rem;
  color: #6c757d;
  min-width: 32px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.ab-slider {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: #dee2e6;
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
.ab-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ff6f61;
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  cursor: pointer;
}
.ab-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ff6f61;
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  cursor: pointer;
}