.sf3d-viewer-wrap {
  position: relative;
  box-sizing: border-box;
  width: calc(100% - 32px);
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
  overflow: hidden;
  border-radius: 16px;
  background: #f0f0f0;
  --sf3d-fg: rgba(255, 255, 255, 0.92);
  --sf3d-fg-muted: rgba(255, 255, 255, 0.55);
  --sf3d-surface: rgba(255, 255, 255, 0.06);
  --sf3d-surface-hover: rgba(255, 255, 255, 0.11);
  --sf3d-surface-active: rgba(255, 255, 255, 0.16);
  --sf3d-border: rgba(255, 255, 255, 0.1);
  --sf3d-blur: blur(14px);
  --sf3d-radius: 12px;
  --sf3d-radius-sm: 10px;
  --sf3d-font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.sf3d-viewer-wrap:fullscreen,
.sf3d-viewer-wrap:-webkit-full-screen {
  width: 100% !important;
  max-width: none !important;
  margin-left: 0 !important;
  margin-right: 0 !important;
  border-radius: 0 !important;
}

.sf3d-viewer-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.sf3d-viewer-canvas canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.sf3d-icon {
  display: block;
  flex-shrink: 0;
}

/* Centramento icon buttons (fullscreen / exit) */
.sf3d-btn-fullscreen,
.sf3d-btn-exit-fullscreen {
  line-height: 0;
}

.sf3d-btn-fullscreen .sf3d-icon,
.sf3d-btn-exit-fullscreen .sf3d-icon {
  width: 20px;
  height: 20px;
  margin: 0;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

/* Dopo l’HDRI iniziale: spinner fino al GLB (viewer 2D) */
.sf3d-model-loading-overlay {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: none;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  background: transparent;
}

.sf3d-model-loading-overlay[aria-busy="true"] {
  display: flex;
}

.sf3d-model-loading-spinner {
  width: 44px;
  height: 44px;
  box-sizing: border-box;
  border: 3px solid rgba(255, 255, 255, 0.22);
  border-top-color: #000000;
  border-radius: 50%;
  animation: sf3d-model-load-spin 0.75s linear infinite;
  filter: drop-shadow(0 0 1px rgba(255, 255, 255, 0.35));
}

@keyframes sf3d-model-load-spin {
  to {
    transform: rotate(360deg);
  }
}

.sf3d-model-load-error {
  position: absolute;
  inset: 0;
  z-index: 6;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  box-sizing: border-box;
  text-align: center;
  font: 14px/1.55 var(--sf3d-font);
  color: var(--sf3d-fg);
  background: rgba(20, 20, 20, 0.94);
}

/* Icon buttons: fullscreen */
.sf3d-btn-fullscreen,
.sf3d-btn-exit-fullscreen {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 10;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--sf3d-border);
  border-radius: var(--sf3d-radius-sm);
  background: var(--sf3d-surface);
  backdrop-filter: var(--sf3d-blur);
  -webkit-backdrop-filter: var(--sf3d-blur);
  color: var(--sf3d-fg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.sf3d-btn-fullscreen:hover,
.sf3d-btn-exit-fullscreen:hover {
  background: var(--sf3d-surface-hover);
  border-color: rgba(255, 255, 255, 0.16);
}

.sf3d-btn-fullscreen:active,
.sf3d-btn-exit-fullscreen:active {
  transform: none;
}

/* Scene (HDRI) */
.sf3d-scene-wrap {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 10;
}

.sf3d-btn-scene {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: var(--sf3d-radius-sm);
  border: 1px solid var(--sf3d-border);
  background: var(--sf3d-surface);
  backdrop-filter: var(--sf3d-blur);
  -webkit-backdrop-filter: var(--sf3d-blur);
  color: var(--sf3d-fg);
  font: 500 12px/1 var(--sf3d-font);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.sf3d-btn-scene-label {
  margin-top: 1px;
}

.sf3d-btn-scene:hover {
  background: var(--sf3d-surface-hover);
  border-color: rgba(255, 255, 255, 0.16);
}

.sf3d-icon--scene {
  opacity: 0.85;
}

.sf3d-scene-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 6px;
  min-width: 100%;
  display: none;
  flex-direction: column;
  border-radius: var(--sf3d-radius-sm);
  border: 1px solid var(--sf3d-border);
  background: rgba(22, 22, 22, 0.82);
  backdrop-filter: var(--sf3d-blur);
  -webkit-backdrop-filter: var(--sf3d-blur);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  overflow: hidden;
}

.sf3d-scene-dropdown.sf3d-open {
  display: flex;
}

.sf3d-scene-option {
  padding: 11px 14px;
  border: none;
  background: transparent;
  color: var(--sf3d-fg);
  font: 13px/1.35 var(--sf3d-font);
  letter-spacing: 0.01em;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s ease;
  white-space: nowrap;
}

.sf3d-scene-option:hover {
  background: var(--sf3d-surface-hover);
}

.sf3d-scene-option.sf3d-active {
  background: var(--sf3d-surface-active);
  color: #fff;
}

/* Bottom bar */
.sf3d-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;
  padding: 14px 16px 16px;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0.22) 55%, transparent 100%);
  color: var(--sf3d-fg);
}

.sf3d-timeline-wrap {
  margin-bottom: 10px;
}

.sf3d-timeline {
  width: 100%;
  height: 6px;
  border-radius: 999px;
  -webkit-appearance: none;
  appearance: none;
  accent-color: rgba(255, 255, 255, 0.55);
  cursor: pointer;
  background: rgba(255, 255, 255, 0.12);
}

.sf3d-timeline::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
}

.sf3d-timeline::-webkit-slider-thumb {
  -webkit-appearance: none;
  cursor: pointer;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  border: 2px solid rgba(0, 0, 0, 0.35);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
  margin-top: -5px; /* (thumb height - track height) / 2 */
}

.sf3d-timeline::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
}

.sf3d-timeline::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  border: 2px solid rgba(0, 0, 0, 0.35);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

.sf3d-control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.sf3d-control-row-right {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.sf3d-btn-play {
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--sf3d-border);
  border-radius: var(--sf3d-radius-sm);
  background: var(--sf3d-surface);
  backdrop-filter: var(--sf3d-blur);
  -webkit-backdrop-filter: var(--sf3d-blur);
  color: var(--sf3d-fg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.sf3d-btn-play:hover {
  background: var(--sf3d-surface-hover);
  border-color: rgba(255, 255, 255, 0.16);
}

.sf3d-btn-play:active {
  transform: scale(0.97);
}

.sf3d-speed {
  width: auto;
  min-width: 56px;
  max-width: 76px;
  height: 40px;
  box-sizing: border-box;
  padding: 0 26px 0 10px;
  line-height: 40px;
  border-radius: 8px;
  border: 1px solid var(--sf3d-border);
  background: var(--sf3d-surface);
  backdrop-filter: var(--sf3d-blur);
  -webkit-backdrop-filter: var(--sf3d-blur);
  color: var(--sf3d-fg);
  cursor: pointer;
  font: 500 12px/1 var(--sf3d-font);
  letter-spacing: 0.02em;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='rgba(255,255,255,0.45)' stroke-width='2'%3E%3Cpath d='M3 5l3 3 3-3'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

.sf3d-handed-btns {
  display: flex;
  align-items: stretch;
  height: 40px;
  box-sizing: border-box;
  border-radius: 8px;
  border: 1px solid var(--sf3d-border);
  overflow: hidden;
  background: rgba(0, 0, 0, 0.15);
}

.sf3d-handed-btns button {
  height: 40px;
  box-sizing: border-box;
  padding: 0 14px;
  border: none;
  background: transparent;
  color: var(--sf3d-fg-muted);
  font: 500 11px/1 var(--sf3d-font);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, color 0.2s ease;
}

.sf3d-handed-left {
  border-radius: 0;
}

.sf3d-handed-right {
  border-radius: 0;
}

.sf3d-handed-left + .sf3d-handed-right {
  border-left: 1px solid var(--sf3d-border);
}

.sf3d-handed-btns .sf3d-handed-active {
  background: var(--sf3d-surface-active);
  color: #fff;
}

.sf3d-handed-btns button:not(.sf3d-handed-active):hover {
  background: var(--sf3d-surface-hover);
  color: var(--sf3d-fg);
}

.sf3d-bottom-right-buttons {
  position: absolute;
  bottom: 76px;
  right: 14px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
}

.sf3d-btn-swap-model,
.sf3d-btn-swap-hdri {
  padding: 9px 14px;
  border-radius: var(--sf3d-radius-sm);
  border: 1px solid var(--sf3d-border);
  background: var(--sf3d-surface);
  backdrop-filter: var(--sf3d-blur);
  -webkit-backdrop-filter: var(--sf3d-blur);
  color: var(--sf3d-fg);
  font: 500 12px/1 var(--sf3d-font);
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.sf3d-btn-swap-model:hover,
.sf3d-btn-swap-hdri:hover {
  background: var(--sf3d-surface-hover);
  border-color: rgba(255, 255, 255, 0.16);
}

.sf3d-btn-swap-hdri.sf3d-active {
  background: var(--sf3d-surface-active);
  border-color: rgba(255, 255, 255, 0.22);
  color: #fff;
}

/* SEE-THROUGH on: stato selezionato ben visibile (toggle) */
.sf3d-btn-swap-model.sf3d-active {
  background: rgba(37, 99, 235, 0.42);
  border-color: rgba(147, 197, 253, 0.75);
  color: #fff;
  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.35);
}

.sf3d-btn-swap-model:disabled {
  opacity: 0.65;
  cursor: wait;
}

.sf3d-control-row .sf3d-btn-ar,
.sf3d-control-row .sf3d-btn-vr {
  min-width: 44px;
  height: 40px;
  padding: 0 14px;
  box-sizing: border-box;
  border-radius: 8px;
  border: 1px solid var(--sf3d-border);
  background: var(--sf3d-surface);
  backdrop-filter: var(--sf3d-blur);
  -webkit-backdrop-filter: var(--sf3d-blur);
  color: var(--sf3d-fg);
  font: 600 11px/1 var(--sf3d-font);
  letter-spacing: 0.12em;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.sf3d-control-row .sf3d-btn-ar:hover,
.sf3d-control-row .sf3d-btn-vr:hover {
  background: var(--sf3d-surface-hover);
  border-color: rgba(255, 255, 255, 0.16);
}

/* XR modal */
.sf3d-xr-modal {
  position: fixed;
  inset: 0;
  z-index: 999999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  box-sizing: border-box;
}

.sf3d-xr-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.sf3d-xr-modal-box {
  position: relative;
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  background: #181818;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.sf3d-xr-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  flex-shrink: 0;
}

.sf3d-xr-modal-title {
  color: #fff;
  font: 600 15px/1.2 var(--sf3d-font);
  letter-spacing: -0.01em;
}

.sf3d-xr-modal-close {
  width: 36px;
  height: 36px;
  border: 1px solid var(--sf3d-border);
  border-radius: 10px;
  background: var(--sf3d-surface);
  color: #fff;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.sf3d-xr-modal-close:hover {
  background: var(--sf3d-surface-hover);
}

.sf3d-xr-modal-iframe {
  width: 100%;
  height: 360px;
  border: none;
  display: block;
}

/* AR overlay */
.sf3d-ar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999999;
  background: #141414;
}

.sf3d-ar-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--sf3d-fg-muted);
  font: 500 14px var(--sf3d-font);
  margin: 0;
  z-index: 1;
}

.sf3d-ar-overlay model-viewer {
  width: 100%;
  height: 100%;
  display: block;
  min-height: 100vh;
  background: #141414;
}

.sf3d-ar-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 10;
  width: 44px;
  height: 44px;
  border: 1px solid var(--sf3d-border);
  border-radius: 12px;
  background: var(--sf3d-surface);
  backdrop-filter: var(--sf3d-blur);
  -webkit-backdrop-filter: var(--sf3d-blur);
  color: var(--sf3d-fg);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease;
}

.sf3d-ar-close:hover {
  background: var(--sf3d-surface-hover);
}