:root {
  /* Day Mode Colors */
  --primary-bg: #f0f8ff; /* Alice blue - sky */
  --secondary-bg: #fff8dc; /* Cream - lighter gold */
  --accent-color: #dda0dd; /* Plum - purple sparkles */
  --card-bg: #ffffff;
  --text-color: #2e8b57; /* Sea green - greens */
  --button-bg: #ffd700; /* Gold */
  --button-hover: #ffa500; /* Orange */
  --border: #98fb98; /* Pale green */

  /* Night Mode Colors */
  --night-primary-bg: #1e1e3f; /* Indigo */
  --night-secondary-bg: #2d4d2d; /* Moss green */
  --night-accent-color: #dda0dd; /* Lilac */
  --night-card-bg: #3a3a5a;
  --night-text-color: #c0c0c0;
  --night-button-bg: #4b0082; /* Indigo */
  --night-button-hover: #69359c;
  --night-border: #556b2f; /* Dark olive */
}

body.day-mode {
  background: linear-gradient(135deg, var(--primary-bg), var(--secondary-bg));
  color: var(--text-color);
  font-family: 'Arial', sans-serif;
}

body.night-mode {
  background: linear-gradient(135deg, var(--night-primary-bg), var(--night-secondary-bg));
  color: var(--night-text-color);
  font-family: 'Arial', sans-serif;
}

/* Onboarding and Prompts */
.hidden {
  display: none;
}

.onboarding-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
}

.fairy-glow {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-color), var(--primary-bg));
  display: flex;
  align-items: center;
  justify-content: center;
  animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
  from {transform: scale(1);}
  to {transform: scale(1.1);}
}

.fairy-avatar {
  width: 120px;
  height: 120px;
  object-fit: cover;
}

.prompt-box {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  text-align: center;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

/* Dashboard */
#dashboard {
  min-height: 100vh;
  background: var(--primary-bg);
}

.app-header {
  text-align: center;
  padding: 20px 10px;
  border-bottom: 1px solid var(--border);
}

.app-header h1 {
  font-size: 1.8em;
  margin-bottom: 10px;
}

.fairy-speech {
  background: var(--accent-color);
  color: var(--text-color);
  border-radius: 20px;
  padding: 10px 15px;
  display: inline-block;
  font-style: italic;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Navigation */
#nav-tabs {
  display: flex;
  overflow-x: auto;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  scrollbar-width: none;
  -ms-overflow-style: none;
}

#nav-tabs::-webkit-scrollbar {
  display: none;
}

.nav-btn {
  flex: 1;
  padding: 15px 10px;
  border: none;
  background: transparent;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.3s;
  min-width: 80px;
}

.nav-btn.active {
  background: var(--button-bg);
  color: var(--text-color);
}

/* Content */
.tab-content {
  padding: 20px 10px;
}

.search-bar {
  display: flex;
  margin-bottom: 20px;
  gap: 10px;
}

.search-bar input {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 5px;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 15px;
}

.book-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.book-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.book-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.book-info {
  padding: 10px;
}

.book-info h4 {
  margin: 0 0 5px 0;
  font-size: 14px;
  color: var(--text-color);
}

.book-info p {
  margin: 0;
  font-size: 12px;
  color: var(--text-color);
  opacity: 0.8;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: var(--card-bg);
  border-radius: 10px;
  max-width: 90%;
  max-height: 80%;
  overflow-y: auto;
  padding: 20px;
  position: relative;
}

.close-modal {
  position: absolute;
  top: 10px;
  right: 10px;
  border: none;
  background: none;
  font-size: 20px;
  cursor: pointer;
}

.book-detail img {
  width: 150px;
  height: 200px;
  object-fit: cover;
  margin: 0 auto 20px;
  display: block;
}

.book-detail h3 {
  margin: 10px 0;
}

.book-detail p {
  margin: 5px 0;
}

/* Mobile adjustments */
@media (max-width: 768px) {
  .onboarding-container {
    padding: 10px;
  }

  .app-header h1 {
    font-size: 1.5em;
  }

  .fairy-speech {
    font-size: 14px;
  }

  #nav-tabs {
    justify-content: space-around;
  }

  .nav-btn {
    padding: 12px 5px;
    font-size: 12px;
  }

  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }

  .book-info {
    padding: 8px;
  }

  .book-info h4 {
    font-size: 12px;
  }

  .book-info p {
    font-size: 10px;
  }
}

/* Fairy Persona Overlay */
#fairy-overlay {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 80px;
  height: 80px;
  z-index: 999;
}

.fairy-glow {
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, var(--accent-color), transparent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: glow 2s ease-in-out infinite alternate;
}

.fairy-avatar-small {
  width: 60px;
  height: 60px;
  object-fit: cover;
}

.speech-bubble {
  position: absolute;
  bottom: 90px;
  right: 0;
  background: var(--accent-color);
  color: var(--text-color);
  border-radius: 10px 10px 10px 0;
  padding: 10px 15px;
  font-weight: bold;
  font-size: 14px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  white-space: nowrap;
  animation: pop 0.3s ease-out;
}

@keyframes pop {
  from {opacity: 0; transform: scale(0.8);}
  to {opacity: 1; transform: scale(1);}
}

/* Legacy support */
flex {
  display: block;
}

section {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

section h2 {
  margin-top: 0;
  color: var(--text-color);
}

.config-group {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
}

.config-group label {
  min-width: 200px;
  font-weight: bold;
}

.config-group input {
  flex: 1;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: rgba(255,255,255,0.8);
}

button {
  background: var(--button-bg);
  color: var(--text-color);
  border: 1px solid var(--border);
  padding: 10px 15px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  font-weight: bold;
  transition: background 0.3s ease;
}

button:hover {
  background: var(--button-hover);
}

#test-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
}

.output-panel {
  background: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 15px;
}

.output-panel h3 {
  margin-top: 0;
  color: var(--text-color);
}

.output-panel pre {
  white-space: pre-wrap;
  word-wrap: break-word;
  min-height: 80px;
  background: var(--card-bg);
  padding: 10px;
  border-radius: 5px;
  border: 1px solid var(--border);
  font-family: monospace;
}

/* Mobile adjustments */
@media (max-width: 768px) {
  main {
    padding: 10px;
  }

  .config-group {
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
  }

  .config-group label {
    min-width: auto;
    margin-bottom: 5px;
  }

  #test-actions {
    grid-template-columns: 1fr;
  }

  header h1 {
    font-size: 2em;
  }

  section {
    padding: 15px;
  }
}