.viewer3d {
  --v3d-bg: #f4f7fb;
  --v3d-border: #d5dde8;
  --v3d-accent: #1f6feb;
  --v3d-text: #1f2937;
  --v3d-muted: #6b7280;
  --v3d-panel: rgba(255, 255, 255, 0.92);
  position: relative;
  width: 100%;
  max-width: 100%;
  margin: 0 0 1.25rem;
  border: 1px solid var(--v3d-border);
  background:
    radial-gradient(120% 80% at 10% 0%, #e8f1ff 0%, transparent 55%),
    linear-gradient(180deg, #ffffff 0%, var(--v3d-bg) 100%);
  color: var(--v3d-text);
  overflow: hidden;
}

.viewer3d.is-fullscreen {
  position: fixed;
  inset: 0;
  z-index: 99999;
  max-width: none;
  margin: 0;
  border: 0;
  border-radius: 0;
}

.viewer3d__canvas-wrap {
  position: relative;
  width: 100%;
  height: var(--viewer3d-height, 320px);
  min-height: 240px;
}

.viewer3d.is-fullscreen .viewer3d__canvas-wrap {
  height: calc(100vh - 52px);
}

.viewer3d__canvas {
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
  touch-action: none;
  cursor: grab;
}

.viewer3d__canvas:active {
  cursor: grabbing;
}

.viewer3d__toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
  padding: 0.45rem 0.55rem;
  background: var(--v3d-panel);
  border-top: 1px solid var(--v3d-border);
}

.viewer3d__btn {
  appearance: none;
  border: 1px solid var(--v3d-border);
  background: #fff;
  color: var(--v3d-text);
  font: 600 12px/1.2 "Segoe UI", Tahoma, sans-serif;
  padding: 0.45rem 0.65rem;
  min-height: 32px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.viewer3d__btn:hover,
.viewer3d__btn.is-active {
  border-color: var(--v3d-accent);
  color: var(--v3d-accent);
  background: #eef5ff;
}

.viewer3d__btn:focus-visible {
  outline: 2px solid var(--v3d-accent);
  outline-offset: 1px;
}

.viewer3d__hint {
  flex: 1 0 100%;
  margin-left: 0;
  font: 500 11px/1.3 "Segoe UI", Tahoma, sans-serif;
  color: var(--v3d-muted);
  max-width: none;
  white-space: nowrap;
  text-align: left;
  overflow-x: auto;
}

.viewer3d__status,
.viewer3d__error {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  padding: 0.65rem 0.9rem;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--v3d-border);
  font: 500 13px/1.35 "Segoe UI", Tahoma, sans-serif;
  color: var(--v3d-muted);
  pointer-events: none;
  z-index: 2;
}

.viewer3d__error {
  color: #b42318;
  border-color: #f3c1c1;
  background: #fff5f5;
}

.viewer3d__status[hidden],
.viewer3d__error[hidden] {
  display: none !important;
}

@media (max-width: 767px) {
  .viewer3d__canvas-wrap {
    height: 260px;
  }

  .viewer3d__hint {
    display: none;
  }

  .viewer3d__btn {
    flex: 1 1 auto;
    text-align: center;
  }
}