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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #000;
  color: #fff;
  overflow: hidden;
}

.screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
}

.screen.active {
  display: flex;
}

#loading-screen {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}

.loading-card {
  text-align: center;
}

.platform-label {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 24px;
  color: #ffd700;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  margin: 0 auto 24px;
  border: 3px solid rgba(255, 215, 0, 0.2);
  border-top-color: #ffd700;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.8);
}

#landing {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  padding: 20px;
  position: relative;
  z-index: 10;
}

.logo {
  width: 120px;
  height: 120px;
  object-fit: contain;
  margin-bottom: 32px;
  border-radius: 12px;
}

#landing h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  text-align: center;
}

.subtitle {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 32px;
  text-align: center;
  max-width: 400px;
}

#start-btn {
  padding: 16px 48px;
  font-size: 18px;
  font-weight: 600;
  background: linear-gradient(135deg, #ffd700 0%, #ffb700 100%);
  color: #1a1a2e;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
  position: relative;
  z-index: 10000;
}

#start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 215, 0, 0.3);
}

#start-btn:active {
  transform: translateY(0);
  box-shadow: 0 4px 12px rgba(255, 215, 0, 0.3);
}

#start-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  pointer-events: none;
}

.permission-note {
  margin-top: 24px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
}

#ar-view {
  background: #000;
}

a-scene {
  width: 100%;
  height: 100%;
}

.scan-hint {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 32px;
  background: rgba(0, 0, 0, 0.8);
  border-radius: 50px;
  font-size: 16px;
  backdrop-filter: blur(10px);
}

.scan-dot {
  width: 12px;
  height: 12px;
  background: #ffd700;
  border-radius: 50%;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hidden {
  display: none !important;
}

.error-banner {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 16px 24px;
  background: #ff4444;
  color: white;
  border-radius: 8px;
  font-size: 14px;
  max-width: 90%;
  text-align: center;
  z-index: 1000;
}