.model-viewer-3d-container {
  width: 100%;
  height: 100vh;
  background: #1b1d20;
  position: relative;
}

.viewer-content {
  width: 100%;
  height: 100%;
  position: relative;
}

.viewer-canvas {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.viewer-canvas canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* 加载动画 */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(27, 29, 32, 0.9);
  z-index: 10;
}

.spinner-ring {
  width: 60px;
  height: 60px;
  border: 4px solid rgba(139, 92, 246, 0.2);
  border-top-color: #8b5cf6;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-overlay p {
  margin-top: 1rem;
  color: #cbd5e1;
  font-size: 0.95rem;
}

/* 错误提示 */
.error-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(220, 38, 38, 0.95);
  color: white;
  padding: 1.5rem 2rem;
  border-radius: 0.5rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  z-index: 10;
}

/* 说话按钮 */
.speak-button {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1rem 2rem;
  font-size: 1.1rem;
  background: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
  border: none;
  color: white;
  border-radius: 50px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
  transition: all 0.3s ease;
  font-weight: 600;
  z-index: 1000;
}

.speak-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.6);
}

.speak-button:active {
  transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .speak-button {
    bottom: 1rem;
    right: 1rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
  }
}