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

:root {
  --bg-dark: #0f1117;
  --bg-panel: #1a1d23;
  --bg-hover: #252830;
  --border: #2d3139;
  --text: #e8eaed;
  --text-muted: #8b919a;
  --accent: #4f8ff7;
  --accent-hover: #3a7ae0;
  --danger: #f87171;
  --sidebar-width: 72px;
  --radius: 8px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font);
  background: var(--bg-dark);
  color: var(--text);
}

#app {
  display: flex;
  height: 100vh;
  position: relative;
}

#app.space-travel-mode .sidebar-dock,
#app.space-travel-mode .sidebar-popup:not(.hidden) {
  display: none;
}

#app.space-travel-mode main.viewport {
  width: 100%;
}

.space-travel-bar {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 20;
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 8px;
  pointer-events: none;
}

.space-travel-bar > * {
  pointer-events: auto;
}

.space-travel-bar.hidden {
  display: none;
}

.space-travel-toolbar {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 6px;
}

.st-menu-group {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.st-menu-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  width: 52px;
  padding: 3px 2px 4px;
  background: transparent;
  border: 2px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  font-family: var(--font);
  color: inherit;
  transition: border-color 0.15s, background 0.15s;
}

.st-menu-btn:hover {
  background: rgba(168, 130, 255, 0.1);
  border-color: rgba(168, 130, 255, 0.35);
}

.st-menu-btn.active,
.st-menu-btn[aria-expanded="true"] {
  border-color: rgba(168, 130, 255, 0.5);
  background: rgba(168, 130, 255, 0.14);
}

.st-menu-thumb {
  color: #a882ff;
  border-color: rgba(168, 130, 255, 0.35);
  background: rgba(15, 17, 23, 0.82);
  backdrop-filter: blur(6px);
}

.st-menu-btn:hover .st-menu-thumb,
.st-menu-btn.active .st-menu-thumb,
.st-menu-btn[aria-expanded="true"] .st-menu-thumb {
  color: #c4a8ff;
  border-color: rgba(168, 130, 255, 0.55);
  background: rgba(168, 130, 255, 0.12);
}

.st-menu-label {
  max-width: 54px;
  font-size: 0.56rem;
  line-height: 1.1;
  color: var(--text-muted);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.st-menu-btn.active .st-menu-label,
.st-menu-btn[aria-expanded="true"] .st-menu-label {
  color: #c4a8ff;
}

.st-menu-popup {
  position: absolute;
  top: calc(100% + 8px);
  right: calc(var(--st-cascade, 0) * -28px);
  width: min(320px, 42vw);
  min-width: 260px;
  max-height: min(520px, 62vh);
  display: flex;
  flex-direction: column;
  background: rgba(15, 17, 23, 0.94);
  border: 1px solid var(--border);
  border-radius: 14px;
  backdrop-filter: blur(12px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  overflow: hidden;
  z-index: 21;
}

.st-menu-popup.hidden {
  display: none;
}

.st-menu-popup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.st-menu-popup-title {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 600;
}

.st-menu-popup-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.st-menu-popup-close:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.st-menu-popup-body {
  overflow-y: auto;
  overscroll-behavior: contain;
}

.st-menu-popup-body .lab-bg-slot .dock-popup-section-title {
  display: none;
}

.st-menu-popup-body .bg-pixels-panel,
.st-menu-popup-body .bg-settings-panel {
  padding: 10px 12px 14px;
}

.space-travel-exit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  width: 52px;
  padding: 3px 2px 4px;
  background: transparent;
  border: 2px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  font-family: var(--font);
  color: inherit;
  transition: border-color 0.15s, background 0.15s;
}

.space-travel-exit:hover {
  background: rgba(168, 130, 255, 0.1);
  border-color: rgba(168, 130, 255, 0.4);
}

.space-travel-exit-thumb {
  color: #a882ff;
  border-color: rgba(168, 130, 255, 0.35);
  background: rgba(15, 17, 23, 0.82);
  backdrop-filter: blur(6px);
}

.space-travel-exit:hover .space-travel-exit-thumb {
  color: #c4a8ff;
  border-color: rgba(168, 130, 255, 0.55);
  background: rgba(168, 130, 255, 0.12);
}

.wormhole-icon {
  animation: wormhole-pulse 3s ease-in-out infinite;
}

@keyframes wormhole-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}



/* Left sidebar dock (icon rail) */
.sidebar-dock {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 15;
  flex-shrink: 0;
}

.sidebar-dock-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 14px 8px 10px;
  color: var(--accent);
  border: none;
  border-bottom: 1px solid var(--border);
  background: transparent;
  width: 100%;
  cursor: pointer;
  font-family: var(--font);
  transition: background 0.15s;
}

.sidebar-dock-brand:hover {
  background: rgba(79, 143, 247, 0.08);
}

.brand-app-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  perspective: 120px;
}

.brand-app-mark {
  display: block;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(47, 111, 224, 0.35);
  animation: brand-icon-spin 6s linear infinite;
  transform-origin: center center;
}

.brand-app-mark.spin-once {
  animation: brand-icon-spin-once 0.55s ease-in-out;
}

.sidebar-dock-brand:active .brand-app-mark:not(.spin-once) {
  animation-duration: 1.2s;
}

@keyframes brand-icon-spin {
  from { transform: rotateY(0deg); }
  to { transform: rotateY(360deg); }
}

@keyframes brand-icon-spin-once {
  from { transform: rotateY(0deg) scale(1); }
  50% { transform: rotateY(180deg) scale(0.92); }
  to { transform: rotateY(360deg) scale(1); }
}

.sidebar-version {
  margin-inline-start: 0;
  margin-top: 2px;
  font-size: 0.54rem;
  font-weight: 700;
  padding: 2px 5px;
  letter-spacing: 0.03em;
  color: var(--accent);
  background: rgba(79, 143, 247, 0.12);
  border: 1px solid rgba(79, 143, 247, 0.28);
  border-radius: 4px;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.sidebar-dock-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 10px 6px;
  flex: 1;
}

.dock-group-sep-v {
  width: 36px;
  height: 1px;
  margin: 4px 0;
}

.lang-select-group {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}

.lang-select-popup {
  margin-top: 0;
}

.lang-select-group label {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.lang-select {
  flex: 1;
  min-width: 0;
  width: 100%;
}

.sidebar-footer-note {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.45;
  margin: 0;
}

.sidebar-panel-body {
  max-height: min(480px, 58vh);
}

.tree-panel-inner {
  padding: 0 2px;
}

.tree-panel-inner .tree-list {
  max-height: min(400px, 50vh);
}

.app-version {
  margin-inline-start: 6px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--accent);
  white-space: nowrap;
}

.panel {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
}

.panel h2 {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* File input */
.file-input-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.open-file-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 8px;
}

.btn-open {
  width: 100%;
  margin-top: 0;
}

.btn-open-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.btn-open-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(79, 143, 247, 0.08);
}

.btn-add-model {
  width: 100%;
  margin-top: 8px;
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-muted);
}

.btn-add-model:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.multi-model-panel {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.multi-model-panel h3 {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.multi-model-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 180px;
  overflow-y: auto;
}

.multi-model-item {
  display: grid;
  grid-template-columns: 28px 1fr 28px;
  align-items: center;
  gap: 4px;
  padding: 4px 6px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  transition: border-color 0.15s, background 0.15s;
}

.multi-model-item.active {
  border-color: var(--accent);
  background: rgba(79, 143, 247, 0.1);
}

.multi-model-vis,
.multi-model-remove,
.multi-model-name {
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  color: var(--text-muted);
  padding: 2px;
  border-radius: 6px;
}

.multi-model-vis:hover,
.multi-model-remove:hover {
  color: var(--accent);
  background: rgba(79, 143, 247, 0.1);
}

.multi-model-name {
  text-align: left;
  font-size: 0.78rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
}

.multi-model-name:hover {
  color: var(--accent);
}

.multi-model-remove:hover {
  color: #f87171;
  background: rgba(248, 113, 113, 0.12);
}

.btn-danger {
  background: rgba(248, 113, 113, 0.15);
  border: 1px solid rgba(248, 113, 113, 0.45);
  color: #fca5a5;
}

.btn-danger:hover:not(:disabled) {
  background: rgba(248, 113, 113, 0.28);
  border-color: #f87171;
  color: #fff;
}

.btn-danger:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.edit-tools-controls {
  margin-top: 8px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
}

.edit-tools-hint {
  margin: 0 0 8px;
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.edit-selection-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.edit-selection-label {
  flex: 1;
  font-size: 0.78rem;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.edit-axis-move {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.edit-axis-move.hidden {
  display: none;
}

.edit-axis-move-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.edit-axis-pad {
  display: grid;
  grid-template-columns: repeat(3, 36px);
  grid-template-rows: repeat(3, 32px);
  gap: 4px;
  justify-content: center;
  margin-bottom: 8px;
}

.edit-axis-pad .edit-axis-btn:nth-child(1) {
  grid-column: 2;
  grid-row: 1;
}

.edit-axis-pad .edit-axis-btn:nth-child(2) {
  grid-column: 1;
  grid-row: 2;
}

.edit-axis-center {
  grid-column: 2;
  grid-row: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  opacity: 0.45;
}

.edit-axis-pad .edit-axis-btn:nth-child(4) {
  grid-column: 3;
  grid-row: 2;
}

.edit-axis-pad .edit-axis-btn:nth-child(5) {
  grid-column: 2;
  grid-row: 3;
}

.edit-axis-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  min-width: 0;
  width: 100%;
  height: 100%;
  font-size: 0.82rem;
  line-height: 1;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.edit-axis-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent);
}

.edit-axis-btn:active:not(:disabled) {
  background: rgba(99, 102, 241, 0.25);
}

.edit-axis-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.edit-axis-z-row {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.edit-axis-z {
  flex: 1;
  max-width: 80px;
  height: 30px;
  font-size: 0.72rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.edit-axis-hint {
  margin: 8px 0 0;
  font-size: 0.65rem;
  color: var(--text-muted);
  line-height: 1.4;
  text-align: center;
}

#canvas.edit-mode {
  cursor: default;
}

.btn-sm {
  padding: 6px 10px;
  font-size: 0.72rem;
}

.btn-block {
  width: 100%;
  margin-top: 8px;
}

.view-btn-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.section-controls,
.measure-controls {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.measure-result {
  margin-top: 10px;
  padding: 10px 12px;
  background: var(--bg-hover);
  border-radius: var(--radius);
}

.measure-result-title {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.measure-result-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 10px;
}

.measure-result-stats dt {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.measure-result-stats dd {
  font-size: 0.82rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: #ffcc00;
}

.recent-files {
  margin-top: 12px;
}

.recent-files h3 {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.recent-files-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: min(240px, 36vh);
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  padding-right: 2px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.recent-files-list::-webkit-scrollbar {
  width: 6px;
}

.recent-files-list::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.recent-files-list::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.recent-file-item {
  display: flex;
  align-items: stretch;
  gap: 4px;
}

.recent-file-btn {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 6px 8px;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.recent-file-btn:hover {
  border-color: var(--accent);
}

.recent-file-name {
  font-size: 0.75rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
}

.recent-file-meta {
  font-size: 0.65rem;
  color: var(--text-muted);
}

.recent-file-del {
  width: 28px;
  flex-shrink: 0;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}

.recent-file-del:hover {
  color: var(--danger);
  border-color: var(--danger);
}

.tree-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 180px;
  overflow-y: auto;
}

.tree-section-title {
  margin-top: 6px;
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.tree-section-title:first-child {
  margin-top: 0;
}

.tree-section-sketch {
  color: var(--accent);
}

.tree-item-sketch span {
  color: var(--text);
}

.tree-item-selected {
  border-color: var(--accent) !important;
  background: rgba(79, 143, 247, 0.12);
}

.tree-item-selected span {
  color: var(--accent);
  font-weight: 600;
}

.tree-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  padding: 4px 0;
}

.tree-item-check {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
  cursor: pointer;
}

.tree-item span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-layer-color,
.tree-color-btn {
  width: 28px;
  height: 22px;
  padding: 0;
  border: 1px solid var(--border, #3a3f4b);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
}

.tree-color-btn:hover {
  border-color: var(--accent);
}

.modal-toggle {
  margin: 12px 0 4px;
  font-size: 0.85rem;
}

/* Drop zone */
.drop-zone {
  display: block;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(79, 143, 247, 0.06);
}

.drop-zone svg {
  color: var(--text-muted);
  margin-bottom: 8px;
}

.drop-zone p {
  font-size: 0.85rem;
  margin-bottom: 6px;
}

.drop-zone .formats {
  font-size: 0.68rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.web-deploy-notice {
  margin: 0 0 10px;
  padding: 8px 10px;
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--text-muted);
  background: rgba(79, 143, 247, 0.08);
  border: 1px solid rgba(79, 143, 247, 0.2);
  border-radius: var(--radius);
}

.file-info {
  margin-top: 10px;
  padding: 10px 12px;
  background: var(--bg-hover);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.file-info-text {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.file-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.btn-save {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 7px 8px;
  font-size: 0.72rem;
  white-space: nowrap;
}

.btn-export {
  border-color: rgba(79, 143, 247, 0.4);
}

.btn-drawing {
  border-color: rgba(52, 211, 153, 0.4);
}

.drawing-preview-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
  text-align: left;
}

.drawing-view-tag {
  font-size: 0.78rem;
  padding: 6px 10px;
  border-radius: 6px;
  background: var(--bg-hover);
  border: 1px solid var(--border);
}

.drawing-view-tag.top { border-left: 3px solid #34d399; }
.drawing-view-tag.front { border-left: 3px solid #f87171; }
.drawing-view-tag.side { border-left: 3px solid #60a5fa; }

.btn-save:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-save:disabled:hover {
  background: var(--bg-hover);
  border-color: var(--border);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.file-name {
  font-size: 0.82rem;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-format {
  font-size: 0.7rem;
  background: var(--accent);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  flex-shrink: 0;
  font-weight: 600;
}

/* Controls */
.select-group {
  margin-bottom: 12px;
}

.select-group label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.select-input {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.82rem;
  font-family: var(--font);
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s;
}

.select-input:focus {
  border-color: var(--accent);
}

.controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: var(--bg-hover);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.82rem;
  transition: background 0.15s;
  user-select: none;
}

.toggle:hover {
  background: #2e333d;
}

.toggle input[type="checkbox"] {
  accent-color: var(--accent);
  width: 15px;
  height: 15px;
}

.btn-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.btn {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.82rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  font-family: var(--font);
}

.btn:hover {
  background: #2e333d;
  border-color: var(--accent);
}

.slider-group {
  margin-bottom: 10px;
}

.slider-group:last-child {
  margin-bottom: 0;
}

.slider-group label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.slider-group input[type="color"] {
  width: 100%;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-hover);
  cursor: pointer;
  padding: 2px 4px;
}

.color-swatch-trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-hover);
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.color-swatch-trigger:hover {
  border-color: var(--accent);
}

.color-swatch-preview {
  width: 28px;
  height: 22px;
  border-radius: 4px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.color-swatch-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: ui-monospace, monospace;
}

.color-picker-current {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.color-picker-current input[type="color"] {
  width: 56px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2px;
  background: var(--bg-hover);
  cursor: pointer;
}

.color-picker-hex {
  font-family: ui-monospace, monospace;
  font-size: 0.9rem;
  color: var(--text);
}

.flip-btn-grid {
  margin-top: 8px;
}

.color-presets {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

.color-presets-modal {
  margin-bottom: 16px;
}

.color-preset-btn {
  width: 100%;
  aspect-ratio: 1;
  min-height: 28px;
  border: 2px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  padding: 0;
  transition: border-color 0.15s, transform 0.1s;
}

.color-preset-btn:hover {
  transform: scale(1.06);
}

.color-preset-btn.active {
  border-color: var(--accent, #6b9bd1);
  box-shadow: 0 0 0 1px var(--bg-panel, #252830);
}

.color-preset-btn:focus-visible {
  outline: 2px solid var(--accent, #6b9bd1);
  outline-offset: 2px;
}

/* Stats */
.stats {
  display: grid;
  gap: 6px;
}

.stats div {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 10px;
  background: var(--bg-hover);
  border-radius: 6px;
}

.stats dt {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.stats dd {
  font-size: 0.82rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.sidebar-footer {
  margin-top: auto;
  padding: 14px 18px;
  border-top: 1px solid var(--border);
}

.sidebar-footer p {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.sidebar-contact {
  margin-top: 6px;
}

.sidebar-contact a {
  color: var(--accent);
  text-decoration: none;
}

.sidebar-contact a:hover {
  text-decoration: underline;
}

/* Viewport */
.viewport {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.viewport.viewport-solid-bg {
  background: #1a1d23;
}

/* Model tabs (viewport top) */
.model-tabs {
  position: absolute;
  top: 10px;
  left: 12px;
  right: 12px;
  z-index: 11;
  pointer-events: auto;
}

.model-tabs-list {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 6px;
  width: 100%;
  padding: 4px 6px;
  background: rgba(15, 17, 23, 0.88);
  border: 1px solid var(--border);
  border-radius: 12px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.28);
  box-sizing: border-box;
}

.model-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  width: 52px;
  padding: 3px 2px 4px;
  background: transparent;
  border: 2px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  font-family: var(--font);
  transition: border-color 0.15s, background 0.15s;
}

.model-tab:hover {
  background: rgba(79, 143, 247, 0.08);
}

.model-tab.active {
  border-color: var(--accent);
  background: rgba(79, 143, 247, 0.14);
}

.model-tab-thumb {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  object-fit: cover;
  background: var(--bg);
  border: 1px solid var(--border);
  display: block;
}

.model-tab-thumb-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: rgba(79, 143, 247, 0.12);
}

.model-tab-label {
  max-width: 48px;
  font-size: 0.58rem;
  line-height: 1.1;
  color: var(--text-muted);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.model-tab.active .model-tab-label {
  color: var(--accent);
}

#bg-pixels {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

#canvas {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
}

/* Viewport dock (bottom) — mirrors model-tabs (top) */
.viewport-dock {
  position: absolute;
  bottom: 10px;
  left: 12px;
  right: 12px;
  z-index: 14;
  pointer-events: auto;
}

.viewport-dock-list {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
  width: 100%;
  padding: 4px 8px;
  background: rgba(15, 17, 23, 0.88);
  border: 1px solid var(--border);
  border-radius: 12px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.28);
  box-sizing: border-box;
}

.dock-tab {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  width: 52px;
  padding: 3px 2px 4px;
  background: transparent;
  border: 2px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  font-family: var(--font);
  color: inherit;
  transition: border-color 0.15s, background 0.15s;
}

.dock-tab:hover {
  background: rgba(79, 143, 247, 0.08);
}

.dock-tab.active,
.dock-tab[aria-expanded="true"] {
  border-color: var(--accent);
  background: rgba(79, 143, 247, 0.14);
}

.dock-tab-thumb {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.dock-tab:hover .dock-tab-thumb {
  color: var(--text);
  border-color: rgba(79, 143, 247, 0.35);
}

.dock-tab.active .dock-tab-thumb,
.dock-tab[aria-expanded="true"] .dock-tab-thumb {
  color: var(--accent);
  border-color: rgba(79, 143, 247, 0.45);
  background: rgba(79, 143, 247, 0.12);
}

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

.dock-group-sep {
  width: 1px;
  height: 36px;
  background: rgba(255, 255, 255, 0.12);
  margin: 0 2px;
  flex-shrink: 0;
}

.dock-tab-label {
  max-width: 54px;
  font-size: 0.56rem;
  line-height: 1.1;
  color: var(--text-muted);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dock-tab.active .dock-tab-label,
.dock-tab[aria-expanded="true"] .dock-tab-label {
  color: var(--accent);
}

.dock-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 1.1rem;
  height: 1.1rem;
  padding: 0 4px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.62rem;
  font-weight: 700;
  line-height: 1.1rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
  pointer-events: none;
}

.dock-badge.hidden {
  display: none;
}

/* Dock popups */
.dock-popup {
  position: absolute;
  left: 50%;
  right: auto;
  bottom: 86px;
  transform: translateX(-50%);
  width: 40%;
  min-width: 280px;
  max-width: 520px;
  z-index: 13;
  max-height: min(420px, 52vh);
  display: flex;
  flex-direction: column;
  background: rgba(15, 17, 23, 0.92);
  border: 1px solid var(--border);
  border-radius: 14px;
  backdrop-filter: blur(12px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  overflow: hidden;
  pointer-events: auto;
}

.dock-popup.hidden {
  display: none;
}

.dock-popup-positioned {
  bottom: auto;
  transform: none;
}

.dock-popup-wide {
  max-height: min(520px, 62vh);
}

.dock-popup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.dock-popup-drag-handle {
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.dock-popup-drag-handle.dock-dragging {
  cursor: grabbing;
}

.dock-popup-drag-handle .dock-popup-title {
  flex: 1;
  min-width: 0;
}

.dock-popup-title {
  margin: 0;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
}

.dock-popup-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.dock-text-btn {
  padding: 5px 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.72rem;
  cursor: pointer;
  font-family: var(--font);
}

.dock-text-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.dock-popup-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.dock-popup-close:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.dock-popup-body {
  overflow-y: auto;
  overscroll-behavior: contain;
}

.dock-popup-body .bg-pixels-panel {
  padding: 12px 14px 16px;
}

.dock-panel-form {
  padding: 12px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dock-panel-form .select-group {
  margin-bottom: 0;
}

.dock-panel-form .toggle {
  margin-bottom: 0;
}

.dock-controls-grid {
  margin-bottom: 0;
  width: 100%;
}

.dock-popup-section-title {
  margin: 12px 0 8px;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.dock-popup-section-title:first-child {
  margin-top: 0;
}

.dock-popup-lab-note {
  margin: 12px 0 0;
  font-size: 0.68rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.dock-tab-lab .dock-tab-thumb {
  border-color: rgba(168, 130, 255, 0.35);
}

.dock-tab-lab:hover .dock-tab-thumb,
.dock-tab-lab.active .dock-tab-thumb,
.dock-tab-lab[aria-expanded="true"] .dock-tab-thumb {
  color: #c4a8ff;
  border-color: rgba(168, 130, 255, 0.5);
}

.dock-tab-lab.active .dock-tab-label,
.dock-tab-lab[aria-expanded="true"] .dock-tab-label {
  color: #c4a8ff;
}

.sidebar-lab-body {
  padding: 12px 14px 16px;
}

.sidebar-lab-body .visitor-chat-panel {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 4px;
}

.puzzle-panel-form {
  padding: 0;
}

.puzzle-desc {
  margin-bottom: 8px;
}

.puzzle-hint {
  margin-top: 8px;
}

.puzzle-status {
  font-size: 0.78rem;
  color: var(--accent);
  min-height: 1.2em;
  margin: 0;
}

.puzzle-btn-row {
  margin-bottom: 8px;
}

.puzzle-hud {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 16;
  pointer-events: auto;
}

.puzzle-hud.hidden {
  display: none;
}

.puzzle-hud-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 8px 12px;
  background: rgba(15, 17, 23, 0.9);
  border: 1px solid var(--border);
  border-radius: 12px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.3);
}

.puzzle-hud-title {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.puzzle-hud-progress,
.puzzle-hud-time {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.puzzle-hud-stop {
  flex: 0 0 auto;
  min-width: 56px;
}

.lab-section-mount .bg-pixels-panel {
  padding: 8px 0 12px;
}

/* Sidebar popups (left rail) — after .dock-popup to override position */
.sidebar-popup.dock-popup {
  left: calc(var(--sidebar-width) + 10px);
  top: 50%;
  bottom: auto;
  right: auto;
  transform: translateY(-50%);
  width: min(320px, 36vw);
  min-width: 260px;
  max-width: 400px;
  z-index: 14;
}

.sidebar-popup.dock-popup-wide {
  width: min(360px, 40vw);
  max-width: 440px;
}

.sidebar-popup-positioned.dock-popup {
  transform: none;
}

/* Visitor chat (inside popup) */
.visitor-chat-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex: 1;
  min-height: 0;
}

.visitor-chat-messages {
  max-height: min(220px, 32vh);
  overflow-y: auto;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.visitor-chat-empty {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
  padding: 12px 0;
}

.visitor-chat-message {
  padding: 8px 10px;
  background: var(--bg-hover);
  border-radius: 6px;
}

.visitor-chat-message-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.visitor-chat-author {
  font-size: 0.76rem;
  color: var(--accent);
}

.visitor-chat-time {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.visitor-chat-text {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

.visitor-chat-form {
  padding: 10px 12px 8px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.visitor-chat-name,
.visitor-chat-input {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.82rem;
  font-family: var(--font);
}

.visitor-chat-name:focus,
.visitor-chat-input:focus {
  outline: none;
  border-color: var(--accent);
}

.visitor-chat-input-row {
  display: flex;
  gap: 8px;
}

.visitor-chat-input-row .visitor-chat-input {
  flex: 1;
}

.visitor-chat-send {
  flex: 0 0 auto;
  min-width: 64px;
}

.visitor-chat-hint {
  margin: 0;
  padding: 0 12px 10px;
  font-size: 0.68rem;
  color: var(--text-muted);
}

.empty-state {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  gap: 12px;
}

.empty-open-trigger {
  pointer-events: auto;
  cursor: pointer;
}

.empty-open-trigger:hover {
  color: var(--accent);
}

.empty-open-trigger:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.empty-state.hidden {
  display: none;
}

.empty-icon {
  color: var(--border);
  margin-bottom: 4px;
}

.empty-state h2 {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text-muted);
}

.empty-state p {
  font-size: 0.85rem;
  color: #555b66;
}

.empty-hint {
  font-size: 0.8rem;
  color: var(--accent);
  margin-top: 4px;
}

/* Loading screen */
body.is-loading {
  overflow: hidden;
}

.loading-screen {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 12, 18, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.loading-screen.hidden {
  display: none;
}

.loading-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: min(360px, 88vw);
  padding: 32px 28px 28px;
  border-radius: 14px;
  background: var(--panel, #1e2229);
  border: 1px solid var(--border, #3a3f4b);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
  text-align: center;
}

.loading-spinner-wrap {
  margin-bottom: 4px;
}

.spinner {
  width: 44px;
  height: 44px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text, #e8eaed);
}

.loading-message {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted, #9aa0a6);
  line-height: 1.4;
}

.loading-filename {
  margin: 0;
  font-size: 0.8rem;
  color: var(--accent, #6b9bd1);
  word-break: break-all;
  max-width: 100%;
}

.loading-filename.hidden {
  display: none;
}

.loading-progress-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  margin-top: 4px;
}

.loading-progress {
  flex: 1;
  height: 6px;
  background: var(--border, #3a3f4b);
  border-radius: 3px;
  overflow: hidden;
  position: relative;
}

.loading-progress-bar {
  position: absolute;
  inset: 0 auto 0 0;
  height: 100%;
  width: 0%;
  background: var(--accent, #6b9bd1);
  border-radius: 3px;
  transition: width 0.2s ease;
}

.loading-progress-bar.hidden {
  display: none;
}

.loading-progress-indeterminate {
  position: absolute;
  inset: 0;
  width: 40%;
  background: linear-gradient(90deg, transparent, var(--accent, #6b9bd1), transparent);
  border-radius: 3px;
  animation: loading-slide 1.2s ease-in-out infinite;
}

.loading-progress-indeterminate.hidden {
  display: none;
}

@keyframes loading-slide {
  0% { transform: translateX(-120%); }
  100% { transform: translateX(320%); }
}

.loading-percent {
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted, #9aa0a6);
  min-width: 2.5rem;
  text-align: right;
}

.loading-stage {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-muted, #9aa0a6);
  opacity: 0.85;
  min-height: 1.1em;
}

.loading-cancel {
  margin-top: 8px;
  min-width: 96px;
  background: transparent;
  border-color: var(--border, #3a3f4b);
  color: var(--text-muted, #9aa0a6);
}

.loading-cancel:hover:not(:disabled) {
  border-color: var(--danger, #f87171);
  color: var(--danger, #f87171);
}

.loading-cancel:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* Toast */
.toast {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  z-index: 30;
  max-width: 80%;
  text-align: center;
  transition: opacity 0.2s;
}

.toast.hidden {
  display: none;
}

.toast.success {
  background: #0f2a1f;
  border: 1px solid #34d399;
  color: #6ee7b7;
}

.toast.info {
  background: #1a2332;
  border: 1px solid var(--accent, #6b9bd1);
  color: #a8c8e8;
}

.toast.error {
  background: #3b1219;
  border: 1px solid var(--danger);
  color: var(--danger);
}

.hidden {
  display: none !important;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(3px);
}

.modal-box {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  width: 90%;
  max-width: 380px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
  text-align: center;
}

.modal-box-wide {
  max-width: 420px;
  text-align: left;
}

.modal-field {
  margin-bottom: 12px;
}

.modal-field label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.modal-field .modal-input {
  margin-bottom: 0;
}

.modal-note {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 16px;
  padding: 8px 10px;
  background: var(--bg-hover);
  border-radius: 6px;
  border: 1px solid var(--border);
}

.modal-icon {
  margin: 0 auto 14px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.alert-icon {
  background: rgba(248, 113, 113, 0.15);
  color: var(--danger);
}

.convert-icon {
  background: rgba(107, 155, 209, 0.15);
  color: var(--accent);
}

.convert-backends {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: -8px 0 16px;
  padding: 8px 10px;
  background: var(--bg-hover);
  border-radius: 6px;
  border: 1px solid var(--border);
  text-align: left;
}

.modal-actions-stack {
  flex-direction: column;
}

.modal-actions-stack .btn {
  width: 100%;
}

.modal-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.modal-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.modal-message {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  word-break: break-word;
  text-align: left;
  background: var(--bg-hover);
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.modal-input {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.88rem;
  font-family: var(--font);
  margin-bottom: 16px;
  outline: none;
  transition: border-color 0.15s;
}

.modal-input:focus {
  border-color: var(--accent);
}

.modal-btn {
  width: 100%;
}

.modal-actions {
  display: flex;
  gap: 8px;
}

.modal-actions .btn {
  flex: 1;
}

/* Responsive — narrow screens: left dock rail + right viewport */
@media (max-width: 700px) {
  :root {
    --sidebar-width: clamp(56px, 16vw, 72px);
  }

  #app {
    flex-direction: row;
  }

  .sidebar-dock {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    max-width: var(--sidebar-width);
    height: 100vh;
    flex-direction: column;
    flex-shrink: 0;
    border-right: 1px solid var(--border);
    border-bottom: none;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .sidebar-dock-brand {
    flex-direction: column;
    padding: 10px 4px 8px;
    border-bottom: 1px solid var(--border);
    border-right: none;
  }

  .brand-app-icon {
    width: 36px;
    height: 36px;
  }

  .brand-app-mark {
    width: 36px;
    height: 36px;
  }

  .sidebar-version {
    font-size: 0.48rem;
    padding: 1px 4px;
  }

  .sidebar-dock-list {
    flex-direction: column;
    flex-wrap: nowrap;
    justify-content: flex-start;
    padding: 8px 4px;
    gap: 4px;
  }

  .dock-tab {
    width: 100%;
    padding: 2px 0 3px;
  }

  .dock-tab-thumb {
    width: 40px;
    height: 40px;
  }

  .dock-tab-icon {
    width: 20px;
    height: 20px;
  }

  .dock-tab-label {
    font-size: 0.5rem;
    max-width: 52px;
  }

  .dock-group-sep-v {
    width: 32px;
    height: 1px;
    margin: 4px 0;
  }

  .viewport {
    flex: 1;
    min-width: 0;
  }

  .model-tabs {
    top: 6px;
    left: 6px;
    right: 6px;
  }

  .model-tab {
    width: 44px;
  }

  .model-tab-thumb {
    width: 36px;
    height: 36px;
  }

  .viewport-dock {
    bottom: 6px;
    left: 6px;
    right: 6px;
  }

  .empty-state h2 {
    font-size: 0.95rem;
    text-align: center;
    padding: 0 8px;
  }

  .empty-state p,
  .empty-hint {
    font-size: 0.72rem;
    text-align: center;
    padding: 0 8px;
  }

  .empty-icon svg {
    width: 44px;
    height: 44px;
  }

  .sidebar-popup.dock-popup,
  .sidebar-popup.dock-popup-wide {
    left: calc(var(--sidebar-width) + 6px);
    top: 50%;
    bottom: auto;
    right: auto;
    transform: translateY(-50%);
    width: min(calc(100vw - var(--sidebar-width) - 12px), 300px);
    min-width: 0;
    max-width: none;
  }

  .sidebar-popup-positioned.dock-popup {
    transform: none;
  }

  .dock-popup {
    width: min(calc(100vw - var(--sidebar-width) - 12px), 300px);
    min-width: 0;
  }
}

/* RTL (Arabic) */
[dir="rtl"] #app {
  flex-direction: row-reverse;
}

[dir="rtl"] .sidebar-dock {
  border-right: none;
  border-left: 1px solid var(--border);
}

[dir="rtl"] .sidebar-popup.dock-popup {
  left: auto;
  right: calc(var(--sidebar-width) + 10px);
}

[dir="rtl"] .space-travel-bar {
  right: auto;
  left: 14px;
  flex-direction: row-reverse;
}

[dir="rtl"] .st-menu-popup {
  right: auto;
  left: calc(var(--st-cascade, 0) * -28px);
}

[dir="rtl"] .drawing-view-tag.top,
[dir="rtl"] .drawing-view-tag.front,
[dir="rtl"] .drawing-view-tag.side {
  border-left: none;
  border-right: 3px solid;
}

[dir="rtl"] .drawing-view-tag.top { border-right-color: #34d399; }
[dir="rtl"] .drawing-view-tag.front { border-right-color: #f87171; }
[dir="rtl"] .drawing-view-tag.side { border-right-color: #60a5fa; }

@media (max-width: 700px) {
  [dir="rtl"] #app {
    flex-direction: row-reverse;
  }

  [dir="rtl"] .sidebar-dock {
    border-left: 1px solid var(--border);
    border-bottom: none;
  }

  [dir="rtl"] .sidebar-popup.dock-popup,
  [dir="rtl"] .sidebar-popup.dock-popup-wide {
    left: auto;
    right: calc(var(--sidebar-width) + 6px);
  }
}