#model3d-viewer { width: 100%; border: 1px solid #dee2e6; background: #f8f9fa; position: relative; box-sizing: border-box; overflow: hidden; }
#model3d-viewer *, #model3d-viewer *::before, #model3d-viewer *::after { box-sizing: border-box; }

/* 模型切换按钮 */
#model3d-viewer .m3d-switcher {
  display: inline-flex; background: #eee; border-radius: 4px; overflow: hidden;
  position: absolute; top: 10px; left: 10px; z-index: 5; max-width: calc(100% - 20px);
}
#model3d-viewer .m3d-switch-btn {
  padding: 5px 14px; font-size: 12px; cursor: pointer; border: none;
  background: transparent; color: #888; transition: all 0.2s; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis; min-width: 0;
}
#model3d-viewer .m3d-switch-btn:hover { color: #333; }
#model3d-viewer .m3d-switch-btn.m3d-active {
  background: #00a8cc; color: #fff; font-weight: 600;
}

/* 画布区域 */
#model3d-viewer .m3d-canvas-wrap { width: 100%; height: 550px; background: #f0f0f0; position: relative; }
#model3d-viewer .m3d-canvas-wrap canvas { width: 100%; height: 100%; display: block; }

/* 加载按钮 */
#model3d-viewer .m3d-load-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  z-index: 20; padding: 14px 36px; font-size: 16px; font-weight: 600;
  color: #fff; background: #00a8cc;
  border: none; border-radius: 4px; cursor: pointer;
  transition: all 0.3s; letter-spacing: 1px;
}
#model3d-viewer .m3d-load-btn:hover {
  background: #0090ad; transform: translate(-50%, -50%) scale(1.04);
}
#model3d-viewer .m3d-load-btn.m3d-hidden { display: none; }

/* 加载遮罩 */
#model3d-viewer .m3d-loading {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(240,240,240,0.95); display: flex; flex-direction: column;
  align-items: center; justify-content: center; z-index: 10; transition: opacity 0.5s;
  padding: 20px; text-align: center;
}
#model3d-viewer .m3d-loading.m3d-hidden { opacity: 0; pointer-events: none; }
#model3d-viewer .m3d-spinner {
  width: 40px; height: 40px; border: 3px solid #ddd;
  border-top-color: #00a8cc; border-radius: 50%;
  animation: m3d-spin 1s linear infinite;
}
@keyframes m3d-spin { to { transform: rotate(360deg); } }
#model3d-viewer .m3d-loading p { margin-top: 14px; font-size: 14px; color: #666; word-break: break-all; }
#model3d-viewer .m3d-loading .m3d-detail { font-size: 12px; color: #999; margin-top: 4px; }

/* 尺寸信息区 */
#model3d-viewer .m3d-info {
  padding: 12px 16px; border-bottom: 1px solid #eee;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
#model3d-viewer .m3d-info h4 {
  font-size: 14px; color: #00a8cc; margin: 0; letter-spacing: 1px; white-space: nowrap;
}
#model3d-viewer .m3d-dims { display: flex; gap: 16px; flex-wrap: wrap; }
#model3d-viewer .m3d-dim { display: flex; align-items: center; gap: 0; white-space: nowrap; }
#model3d-viewer .m3d-dim-axis { font-size: 15px; font-weight: 700; }
#model3d-viewer .m3d-dim-colon { font-size: 13px; color: #888; margin: 0 2px; }
#model3d-viewer .m3d-dim-value { font-size: 14px; font-weight: 600; color: #222; }
#model3d-viewer .m3d-dim-unit { font-size: 12px; color: #999; margin-left: 3px; }
#model3d-viewer .m3d-unit-toggle {
  display: inline-flex; background: #eee; border-radius: 4px; overflow: hidden;
}
#model3d-viewer .m3d-unit-btn {
  padding: 3px 12px; font-size: 12px; cursor: pointer; border: none;
  background: transparent; color: #888; transition: all 0.2s;
}
#model3d-viewer .m3d-unit-btn.m3d-active {
  background: #00a8cc; color: #fff; font-weight: 600;
}

/* 底部工具栏 */
#model3d-viewer .m3d-bottom {
  padding: 8px 16px; border-top: 1px solid #eee;
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}
#model3d-viewer .m3d-tool-btn {
  background: #f5f5f5; border: 1px solid #ddd; border-radius: 4px;
  padding: 5px 12px; color: #666; font-size: 12px; cursor: pointer;
  transition: all 0.2s;
}
#model3d-viewer .m3d-tool-btn:hover { border-color: #00a8cc; color: #00a8cc; }
#model3d-viewer .m3d-tool-btn.m3d-active {
  background: #e6f7fb; border-color: #00a8cc; color: #00a8cc; font-weight: 600;
}
#model3d-viewer .m3d-help { font-size: 11px; color: #aaa; margin-left: auto; }

/* 平板竖屏 */
@media (max-width: 768px) {
  #model3d-viewer .m3d-canvas-wrap { height: 400px; }
  #model3d-viewer .m3d-info { gap: 10px; padding: 10px 12px; }
  #model3d-viewer .m3d-dims { gap: 10px; }
  #model3d-viewer .m3d-dim-axis { font-size: 14px; }
  #model3d-viewer .m3d-dim-value { font-size: 13px; }
  #model3d-viewer .m3d-bottom { gap: 4px; padding: 8px 12px; }
  #model3d-viewer .m3d-tool-btn { padding: 4px 10px; font-size: 11px; }
  #model3d-viewer .m3d-help { display: none; }
}

/* 手机 */
@media (max-width: 480px) {
  #model3d-viewer .m3d-canvas-wrap { height: 300px; }
  #model3d-viewer .m3d-info {
    flex-direction: column; align-items: flex-start; gap: 8px; padding: 10px;
  }
  #model3d-viewer .m3d-info h4 { font-size: 13px; }
  #model3d-viewer .m3d-dims { gap: 6px; width: 100%; }
  #model3d-viewer .m3d-dim-axis { font-size: 13px; }
  #model3d-viewer .m3d-dim-value { font-size: 12px; }
  #model3d-viewer .m3d-unit-btn { padding: 3px 8px; font-size: 11px; }
  #model3d-viewer .m3d-bottom { gap: 4px; padding: 6px 10px; }
  #model3d-viewer .m3d-tool-btn { padding: 4px 8px; font-size: 11px; }
  #model3d-viewer .m3d-load-btn { padding: 10px 24px; font-size: 14px; }
  #model3d-viewer .m3d-switch-btn { padding: 4px 10px; font-size: 11px; }
}