/* ============================================
   AR Interactive 中文学习 — Main Styles
   ============================================ */

/* CSS Custom Properties (Theme) */
:root {
  /* Default Theme Colors */
  --primary: #e94560;
  --primary-dark: #c73e54;
  --secondary: #0f3460;
  --accent: #16213e;
  --bg-dark: #1a1a2e;
  --bg-card: #16213e;
  --bg-overlay: rgba(26, 26, 46, 0.85);
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-accent: #e94560;
  --success: #4ade80;
  --warning: #fbbf24;
  --error: #f87171;
  --gold: #ffd700;

  /* Typography */
  --font-main: 'Prompt', 'Noto Sans Thai', sans-serif;
  --font-chinese: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-pinyin: 'Roboto', 'Arial', sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 50%;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Safe Areas (for notch devices) */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

/* ============================================
   Reset & Base
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

/* ============================================
   Loading Screen
   ============================================ */
#loading-screen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  gap: var(--space-lg);
  transition: opacity var(--transition-slow);
}

#loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-logo {
  font-size: 3rem;
  animation: pulse 2s ease-in-out infinite;
}

.loading-text {
  font-size: 1.2rem;
  color: var(--text-secondary);
}

.loading-bar-container {
  width: 200px;
  height: 6px;
  background: var(--bg-card);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.loading-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--gold));
  border-radius: var(--radius-full);
  width: 0%;
  transition: width var(--transition-normal);
}

/* ============================================
   Main Menu
   ============================================ */
#main-menu {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--secondary) 100%);
  padding: var(--space-xl);
  gap: var(--space-lg);
}

#main-menu.hidden {
  display: none;
}

.menu-title {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.menu-title h1 {
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--primary), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-sm);
}

.menu-title p {
  font-size: 1rem;
  color: var(--text-secondary);
}

.menu-score-display {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--bg-card);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-lg);
  font-size: 1.2rem;
  color: var(--gold);
  border: 1px solid rgba(255, 215, 0, 0.3);
}

.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  width: 100%;
  max-width: 320px;
}

.menu-btn {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-card);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 1.1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  width: 100%;
}

.menu-btn:hover,
.menu-btn:active {
  border-color: var(--primary);
  transform: translateX(4px);
  background: rgba(233, 69, 96, 0.1);
}

.menu-btn .btn-icon {
  font-size: 1.5rem;
  width: 40px;
  text-align: center;
}

.menu-btn .btn-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: block;
  margin-top: 2px;
}

/* ============================================
   Game HUD (Heads-Up Display)
   ============================================ */
#game-hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: calc(var(--safe-top) + var(--space-sm)) var(--space-md) var(--space-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(180deg, rgba(0,0,0,0.6) 0%, transparent 100%);
  pointer-events: none;
}

#game-hud.hidden {
  display: none;
}

#game-hud > * {
  pointer-events: auto;
}

.hud-left,
.hud-center,
.hud-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hud-score {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--bg-overlay);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  color: var(--gold);
}

.hud-combo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--bg-overlay);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-lg);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  transition: transform var(--transition-fast);
}

.hud-combo.active {
  animation: comboPulse 0.5s ease;
  color: var(--gold);
}

.hud-timer {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--bg-overlay);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  color: var(--text-primary);
}

.hud-timer.warning {
  color: var(--warning);
  animation: blink 1s ease infinite;
}

.hud-back-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--bg-overlay);
  border: none;
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hud-discovery {
  background: var(--bg-overlay);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-lg);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ============================================
   AR Action Buttons (bottom of AR view)
   ============================================ */
#ar-actions {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: var(--space-md) var(--space-lg) calc(var(--safe-bottom) + var(--space-lg));
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-lg);
  background: linear-gradient(0deg, rgba(0,0,0,0.6) 0%, transparent 100%);
}

#ar-actions.hidden {
  display: none;
}

.ar-action-btn {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  border: 3px solid var(--text-primary);
  background: var(--bg-overlay);
  color: var(--text-primary);
  font-size: 1.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  position: relative;
}

.ar-action-btn:active {
  transform: scale(0.9);
}

.ar-action-btn.speak-btn {
  border-color: var(--accent);
  background: rgba(15, 52, 96, 0.8);
}

.ar-action-btn.speak-btn:hover {
  background: var(--secondary);
}

.ar-action-btn.mic-btn {
  width: 72px;
  height: 72px;
  border-color: var(--primary);
  background: rgba(233, 69, 96, 0.2);
}

.ar-action-btn.mic-btn:hover {
  background: rgba(233, 69, 96, 0.4);
}

.ar-action-btn.mic-btn.recording {
  border-color: var(--error);
  background: rgba(248, 113, 113, 0.3);
  animation: recordPulse 1.5s ease infinite;
}

.ar-action-btn.disabled {
  opacity: 0.4;
  pointer-events: none;
}

/* ============================================
   Feedback Toast
   ============================================ */
#feedback-toast {
  position: fixed;
  left: 50%;
  top: 40%;
  transform: translate(-50%, -50%) scale(0);
  z-index: 200;
  padding: var(--space-lg) var(--space-xl);
  border-radius: var(--radius-lg);
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  pointer-events: none;
  transition: transform var(--transition-normal);
  min-width: 200px;
}

#feedback-toast.show {
  transform: translate(-50%, -50%) scale(1);
}

#feedback-toast.success {
  background: rgba(74, 222, 128, 0.9);
  color: #064e3b;
}

#feedback-toast.error {
  background: rgba(248, 113, 113, 0.9);
  color: #7f1d1d;
}

#feedback-toast.info {
  background: rgba(96, 165, 250, 0.9);
  color: #1e3a5f;
}

#feedback-toast .toast-points {
  font-size: 1rem;
  display: block;
  margin-top: var(--space-xs);
}

/* ============================================
   Challenge Mode Banner
   ============================================ */
#challenge-banner {
  position: fixed;
  top: 60px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 60;
  background: var(--bg-overlay);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-lg);
  border: 2px solid var(--primary);
  text-align: center;
  display: none;
}

#challenge-banner.show {
  display: block;
  animation: slideDown 0.3s ease;
}

.challenge-target {
  font-family: var(--font-pinyin);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gold);
}

.challenge-hint {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

/* ============================================
   Collection Grid
   ============================================ */
#collection-screen {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: var(--bg-dark);
  padding: calc(var(--safe-top) + 60px) var(--space-md) var(--space-md);
  overflow-y: auto;
  display: none;
}

#collection-screen.show {
  display: block;
}

.collection-header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.collection-header h2 {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.collection-progress {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.collection-progress-bar {
  width: 120px;
  height: 8px;
  background: var(--bg-card);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.collection-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--gold));
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
  max-width: 500px;
  margin: 0 auto;
}

.collection-item {
  aspect-ratio: 1;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-size: 0.7rem;
  color: var(--text-secondary);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  padding: var(--space-xs);
  text-align: center;
}

.collection-item.discovered {
  border-color: var(--success);
  background: rgba(74, 222, 128, 0.1);
  color: var(--text-primary);
}

.collection-item.discovered:hover {
  transform: scale(1.05);
}

.collection-item .item-emoji {
  font-size: 1.5rem;
}

.collection-item .item-chinese {
  font-family: var(--font-chinese);
  font-size: 0.9rem;
  font-weight: 600;
}

.collection-item .item-pinyin {
  font-family: var(--font-pinyin);
  font-size: 0.6rem;
  color: var(--text-accent);
}

.collection-item:not(.discovered) {
  opacity: 0.4;
}

.collection-item:not(.discovered) .item-chinese,
.collection-item:not(.discovered) .item-pinyin {
  visibility: hidden;
}

/* ============================================
   Shop Screen (see shop.css for more)
   ============================================ */
#shop-screen {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: var(--bg-dark);
  padding: calc(var(--safe-top) + 60px) var(--space-md) var(--space-md);
  overflow-y: auto;
  display: none;
}

#shop-screen.show {
  display: block;
}

/* ============================================
   Settings Overlay
   ============================================ */
#settings-screen {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: var(--bg-dark);
  padding: calc(var(--safe-top) + 60px) var(--space-md) var(--space-md);
  overflow-y: auto;
  display: none;
}

#settings-screen.show {
  display: block;
}

.settings-group {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.settings-group h3 {
  font-size: 1rem;
  margin-bottom: var(--space-md);
  color: var(--text-accent);
}

.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.setting-item:last-child {
  border-bottom: none;
}

.setting-label {
  font-size: 0.9rem;
}

.setting-value {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  width: 48px;
  height: 26px;
  background: var(--bg-dark);
  border-radius: 13px;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.toggle-switch.active {
  background: var(--primary);
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-fast);
}

.toggle-switch.active::after {
  transform: translateX(22px);
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
  display: none !important;
}

.chinese-text {
  font-family: var(--font-chinese);
}

.pinyin-text {
  font-family: var(--font-pinyin);
}

/* ============================================
   Animations
   ============================================ */
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

@keyframes comboPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.3); }
  100% { transform: scale(1); }
}

@keyframes recordPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(248, 113, 113, 0.4); }
  50% { box-shadow: 0 0 0 15px rgba(248, 113, 113, 0); }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes slideDown {
  from { transform: translateX(-50%) translateY(-20px); opacity: 0; }
  to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes confetti {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(-100px) rotate(720deg); opacity: 0; }
}

@keyframes scoreFloat {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(-60px); opacity: 0; }
}

/* Score float animation element */
.score-float {
  position: fixed;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gold);
  pointer-events: none;
  animation: scoreFloat 1.5s ease-out forwards;
  z-index: 300;
}

/* Confetti particles */
.confetti-particle {
  position: fixed;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  pointer-events: none;
  animation: confetti 1s ease forwards;
  z-index: 300;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 360px) {
  .menu-title h1 {
    font-size: 2rem;
  }

  .ar-action-btn {
    width: 56px;
    height: 56px;
    font-size: 1.5rem;
  }

  .ar-action-btn.mic-btn {
    width: 64px;
    height: 64px;
  }

  .collection-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 768px) {
  .menu-buttons {
    max-width: 400px;
  }

  .collection-grid {
    grid-template-columns: repeat(5, 1fr);
    max-width: 600px;
  }
}

/* Landscape mode warning */
@media (orientation: landscape) and (max-height: 500px) {
  #game-hud {
    padding-top: var(--space-xs);
  }

  #ar-actions {
    padding-bottom: var(--space-sm);
  }

  .ar-action-btn {
    width: 48px;
    height: 48px;
    font-size: 1.3rem;
  }

  .ar-action-btn.mic-btn {
    width: 56px;
    height: 56px;
  }
}