/* ============================================
   AI Personalized Storybook — Style
   Max 的太空探險
   ============================================ */

@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: #1a237e;
  --primary-light: #3949ab;
  --bg-warm: #0d1b2a;
  --text-dark: #ffffff;
  --text-medium: rgba(255,255,255,0.8);
  --text-light: rgba(255,255,255,0.5);
  --line-green: #06C755;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.4);
}

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, #0d1b2a 0%, #1a237e 50%, #311b92 100%);
  text-align: center;
}

.landing-cover {
  width: 260px;
  height: 340px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, #1a237e 0%, #283593 40%, #3949ab 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(26,35,126,0.5);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.landing-cover::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -30%;
  width: 60%;
  height: 60%;
  background: rgba(255,255,255,0.08);
  border-radius: 50%;
}

.landing-cover .emoji-art {
  font-size: 80px;
  margin-bottom: 0.5rem;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3));
}

.landing-cover h1 {
  color: white;
  font-size: 1.6rem;
  font-weight: 900;
  text-shadow: 0 2px 8px rgba(0,0,0,0.4);
  line-height: 1.3;
}

.landing-cover .subtitle {
  color: rgba(255,255,255,0.75);
  font-size: 0.9rem;
  margin-top: 0.3rem;
}

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

.landing-info h2 {
  font-size: 1.3rem;
  color: #ffffff;
  margin-bottom: 0.3rem;
}

.landing-info p {
  color: rgba(255,255,255,0.7);
  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: rgba(255,255,255,0.1);
  color: #90caf9;
  border: 2px solid rgba(144,202,249,0.4);
  box-shadow: var(--shadow);
}

.btn-demo:hover {
  background: rgba(255,255,255,0.15);
}

.landing-footer {
  margin-top: 2rem;
  color: rgba(255,255,255,0.4);
  font-size: 0.95rem;
}

.landing-footer a {
  color: rgba(255,255,255,0.6) !important;
}

/* ============================================
   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(0,0,0,0.2), var(--shadow);
}

.page-illustration .emoji-scene {
  font-size: 64px;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
  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(255,255,255,0.15) 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: #ffffff;
  margin-bottom: 0.8rem;
}

.text-en {
  font-size: 1.8rem;
  font-weight: 400;
  line-height: 1.9;
  color: rgba(255,255,255,0.8);
}

/* 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: #ffffff;
  margin-bottom: 0.3rem;
}

.page-cover .cover-subtitle {
  font-size: 1.5rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 1rem;
}

.page-cover .cover-credits {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.5);
}

/* End page */
.page-end .end-text {
  font-size: 1rem;
  color: rgba(255,255,255,0.8);
  margin-top: 1rem;
}

.page-end .end-divider {
  font-size: 1.3rem;
  color: rgba(255,255,255,0.5);
  margin: 1.2rem 0;
}

.page-end .end-credits {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.8;
}

.page-end .end-brand {
  font-size: 0.95rem;
  color: #90caf9;
  font-weight: 700;
  margin-top: 0.5rem;
}

/* Toolbar */
.toolbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3.5rem;
  background: rgba(13,27,42,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid rgba(255,255,255,0.08);
  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: rgba(255,255,255,0.7);
  text-decoration: none;
}

.toolbar-btn:hover {
  background: rgba(255,255,255,0.1);
}

.toolbar-page {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  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(255,255,255,0.2);
  transition: all 0.3s ease;
  cursor: pointer;
}

.progress-dot:hover {
  background: rgba(255,255,255,0.5);
  transform: scale(1.2);
}

.progress-dot.active {
  background: #90caf9;
  width: 24px;
  border-radius: 6px;
}

/* Touch hint arrows */
.touch-hint {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: rgba(255,255,255,0.12);
  z-index: 50;
  pointer-events: none;
  transition: opacity 0.3s;
}

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

/* Page backgrounds — space theme */
.page-bg-1  { background: linear-gradient(160deg, #1a237e 0%, #311b92 100%); }
.page-bg-2  { background: linear-gradient(160deg, #0d1b2a 0%, #1b2838 100%); }
.page-bg-3  { background: linear-gradient(160deg, #1a237e 0%, #0288d1 100%); }
.page-bg-4  { background: linear-gradient(160deg, #263238 0%, #37474f 100%); }
.page-bg-5  { background: linear-gradient(160deg, #bf360c 0%, #e65100 100%); }
.page-bg-6  { background: linear-gradient(160deg, #006064 0%, #00838f 100%); }
.page-bg-7  { background: linear-gradient(160deg, #212121 0%, #424242 100%); }
.page-bg-8  { background: linear-gradient(160deg, #4a148c 0%, #7b1fa2 100%); }
.page-bg-9  { background: linear-gradient(160deg, #0d1b2a 0%, #1a237e 100%); }
.page-bg-10 { background: linear-gradient(160deg, #1b5e20 0%, #2e7d32 100%); }

/* Illustration backgrounds — space theme */
.illust-bg-1  { background: linear-gradient(135deg, #283593, #1a237e, #0d47a1); }
.illust-bg-2  { background: linear-gradient(135deg, #1b2838, #263238, #0d1b2a); }
.illust-bg-3  { background: linear-gradient(135deg, #0277bd, #0288d1, #039be5); }
.illust-bg-4  { background: linear-gradient(135deg, #37474f, #455a64, #546e7a); }
.illust-bg-5  { background: linear-gradient(135deg, #bf360c, #d84315, #e65100); }
.illust-bg-6  { background: linear-gradient(135deg, #00695c, #00838f, #0097a7); }
.illust-bg-7  { background: linear-gradient(135deg, #212121, #333333, #424242); }
.illust-bg-8  { background: linear-gradient(135deg, #4a148c, #6a1b9a, #7b1fa2); }
.illust-bg-9  { background: linear-gradient(135deg, #0d1b2a, #1a237e, #283593); }
.illust-bg-10 { background: linear-gradient(135deg, #1b5e20, #2e7d32, #388e3c); }

/* Install banner */
.install-banner {
  position: fixed;
  bottom: 4rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(26,35,126,0.95);
  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;
  color: white;
}

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

.install-banner button {
  background: #90caf9;
  color: #1a237e;
  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: rgba(255,255,255,0.5);
  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(13,27,42,0.7);
  backdrop-filter: blur(8px);
}

.autoplay-toggle {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.6);
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}
.autoplay-toggle:hover { border-color: #90caf9; color: #90caf9; }
.autoplay-toggle.active {
  background: #1a237e;
  color: #fff;
  border-color: #3949ab;
}

.cover-version {
  margin-top: 8px;
  font-size: 0.72rem;
  color: rgba(255,255,255,0.3);
  letter-spacing: 0.05em;
}

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

.lang-toggle button {
  background: none;
  border: 1px solid rgba(255,255,255,0.2);
  padding: 0.35rem 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  color: rgba(255,255,255,0.6);
  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: #1a237e;
  color: white;
  border-color: #3949ab;
}

.lang-toggle button.active + button {
  border-left-color: #3949ab;
}

/* 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: #90caf9;
  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: #90caf9;
  background: rgba(144,202,249,0.15);
  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(13,27,42,0.95);
  backdrop-filter: blur(10px);
  border-radius: 24px;
  padding: 6px 14px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  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: rgba(255,255,255,0.8);
  padding: 4px 6px;
  border-radius: 50%;
  line-height: 1;
}
.ab-btn:hover { background: rgba(255,255,255,0.1); }
.ab-close { font-size: 0.85rem; color: rgba(255,255,255,0.4); }
.ab-time {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.6);
  min-width: 32px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.ab-slider {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255,255,255,0.15);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
.ab-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #90caf9;
  border: 2px solid rgba(13,27,42,0.8);
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
  cursor: pointer;
}
.ab-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #90caf9;
  border: 2px solid rgba(13,27,42,0.8);
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
  cursor: pointer;
}