:root {
  --bg: #1b1c20;
  --panel: #24262c;
  --panel-2: #2c2f37;
  --border: #3a3d46;
  --text: #e6e8ec;
  --muted: #8a8f9b;
  --accent: #4d9aff;
  --danger: #ff6b6b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 13px;
}

.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.play-controls {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: 12px;
  background: var(--panel-2);
}
.play-controls button.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  font-weight: 600;
  padding: 8px;
}
.play-controls button.primary.playing {
  background: var(--danger);
  border-color: var(--danger);
}
.play-controls .inline { flex-direction: row; justify-content: flex-start; gap: 6px; }
body.playing #viewport { box-shadow: inset 0 0 0 2px var(--danger); }
body.playing .scene-name::after { content: ' · PLAYING'; color: var(--danger); font-weight: 600; }

.layout {
  display: grid;
  grid-template-columns: 20% 60% 20%;
  grid-template-rows: 100vh;
  height: 100vh;
  width: 100%;
}
.layout > * { min-width: 0; min-height: 0; }

.panel {
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
#props-panel { border-right: 0; border-left: 1px solid var(--border); }

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.panel-header .title { font-weight: 600; }
.panel-subheader {
  padding: 8px 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-size: 11px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.subheader-actions { display: inline-flex; gap: 2px; }
.subheader-actions .mini {
  width: 18px;
  height: 18px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}
.subheader-actions .mini:hover { color: var(--text); background: var(--panel-2); }
.muted { color: var(--muted); font-size: 11px; }

.nav {
  display: flex;
  flex-direction: column;
  padding: 8px;
  gap: 4px;
}
.nav hr { border: 0; border-top: 1px solid var(--border); margin: 6px 0; }

button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 10px;
  cursor: pointer;
  text-align: left;
  font-size: 13px;
}
button:hover { background: #343842; }
button.secondary { background: transparent; }
button.danger { color: var(--danger); }

.hierarchy {
  flex: 1;
  overflow: auto;
  border-top: 1px solid var(--border);
}
#hierarchy-list {
  list-style: none;
  margin: 0;
  padding: 4px 0;
}
#hierarchy-list li {
  padding: 4px 12px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#hierarchy-list li:hover { background: var(--panel-2); }
#hierarchy-list li.selected { background: var(--accent); color: #fff; }

#viewport {
  position: relative;
  background: #0f1013;
  overflow: hidden;
  min-width: 0;
  min-height: 0;
}

#toolbar {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  background: rgba(20, 22, 26, 0.85);
  border: 1px solid var(--border);
  border-radius: 6px;
  backdrop-filter: blur(6px);
  z-index: 10;
}
#toolbar .tool {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 30px;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 4px;
  color: var(--muted);
  cursor: pointer;
}
#toolbar .tool:hover { color: var(--text); background: var(--panel-2); }
#toolbar .tool.active { color: #fff; background: var(--accent); }
#toolbar .tool-sep {
  width: 1px;
  height: 18px;
  background: var(--border);
  margin: 0 4px;
}
#toolbar .tool-menu-wrap { position: relative; display: inline-flex; }
.add-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 180px;
  background: rgba(24, 26, 32, 0.97);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  z-index: 30;
  backdrop-filter: blur(8px);
}
.add-menu.hidden { display: none; }
.add-menu-section { padding: 4px 0; }
.add-menu-section + .add-menu-section { border-top: 1px solid var(--border); margin-top: 4px; }
.add-menu-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding: 4px 8px 2px;
}
.add-menu button {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  padding: 6px 10px;
  color: var(--text);
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
}
.add-menu button:hover { background: var(--panel-2); color: #fff; }
#viewport.tool-pan #three-container canvas { cursor: grab; }
#viewport.tool-pan.dragging #three-container canvas { cursor: grabbing; }
#viewport.tool-orbit #three-container canvas { cursor: crosshair; }
#viewport.drop-active::after {
  content: 'Drop GLB / GLTF / OBJ / FBX to import';
  position: absolute;
  inset: 10px;
  border: 2px dashed var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.05em;
  background: rgba(77, 154, 255, 0.08);
  pointer-events: none;
  z-index: 20;
}

#view-toolbar {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  background: rgba(20, 22, 26, 0.85);
  border: 1px solid var(--border);
  border-radius: 6px;
  backdrop-filter: blur(6px);
  z-index: 10;
}
#view-toolbar .tool {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  height: 30px;
  background: transparent;
  border: 0;
  border-radius: 4px;
  color: var(--muted);
  cursor: pointer;
  font-size: 11px;
}
#view-toolbar .tool:hover { color: var(--text); background: var(--panel-2); }
#view-toolbar .tool.active { color: #fff; background: var(--accent); }
#three-container { position: absolute; inset: 0; }
#three-container canvas { display: block; width: 100% !important; height: 100% !important; }
.scene-name {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 4px 10px;
  background: rgba(0,0,0,0.5);
  border-radius: 4px;
  outline: none;
  min-width: 80px;
}
#play-dock {
  position: absolute;
  top: 10px;
  right: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 10;
}
#play-dock #play-btn {
  padding: 6px 14px;
  font-weight: 600;
}
#play-dock #play-status {
  background: rgba(0,0,0,0.5);
  padding: 4px 8px;
  border-radius: 4px;
}
#particle-fields label { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 4px 0; }
#particle-fields .field-label { color: var(--muted); font-size: 12px; flex: 1; }
#particle-fields input[type=number] { width: 90px; }
#particle-fields input[type=color] { width: 44px; height: 24px; padding: 0; border: 1px solid var(--border); background: transparent; }
.canvas2d-add-row { display: flex; flex-wrap: wrap; gap: 4px; margin: 6px 0; }
.canvas2d-add-row button { flex: 0 0 auto; }
#canvas2d-element-props label { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 4px 0; }
#canvas2d-element-props .field-label { color: var(--muted); font-size: 12px; flex: 1; }
#canvas2d-element-props input[type=number], #canvas2d-element-props input[type=text], #canvas2d-element-props textarea, #canvas2d-element-props select { width: 140px; }
#canvas2d-element-props input[type=color] { width: 44px; height: 24px; padding: 0; border: 1px solid var(--border); background: transparent; }
#canvas2d-canvas-props label { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 4px 0; }

/* AI chat widget */
#ai-chat-toggle {
  position: fixed; right: 18px; bottom: 18px; width: 48px; height: 48px; border-radius: 50%;
  background: var(--accent); color: #fff; border: 0; cursor: pointer; z-index: 40;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 18px rgba(0,0,0,0.35);
}
#ai-chat-toggle:hover { filter: brightness(1.1); }
#ai-chat-panel {
  position: fixed; right: 18px; bottom: 78px; width: 420px; max-width: calc(100vw - 36px);
  height: 540px; max-height: calc(100vh - 120px);
  background: rgba(20,22,26,0.98); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 10px 36px rgba(0,0,0,0.5); z-index: 40;
  display: flex; flex-direction: column; overflow: hidden;
  backdrop-filter: blur(10px);
}
#ai-chat-panel.hidden { display: none; }
.ai-chat-header {
  display: flex; align-items: center; gap: 8px; padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.ai-chat-header strong { flex: 0 0 auto; }
.ai-chat-header .muted { flex: 1; }
#ai-chat-log {
  flex: 1; overflow-y: auto; padding: 10px 12px; font-size: 13px; line-height: 1.45;
  display: flex; flex-direction: column; gap: 10px;
}
.ai-msg { padding: 8px 10px; border-radius: 6px; white-space: pre-wrap; word-wrap: break-word; }
.ai-msg.user { background: var(--accent); color: #fff; align-self: flex-end; max-width: 85%; }
.ai-msg.assistant { background: var(--panel-2); color: var(--text); align-self: flex-start; max-width: 90%; }
.ai-msg.tool { background: rgba(77,154,255,0.08); border-left: 3px solid var(--accent); color: var(--muted); font-size: 11px; font-family: monospace; align-self: flex-start; max-width: 95%; }
.ai-msg.error { background: rgba(232,76,61,0.15); color: #ff9189; }
#ai-chat-form {
  display: flex; gap: 6px; padding: 8px; border-top: 1px solid var(--border);
}
#ai-chat-input {
  flex: 1; background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; padding: 8px; resize: none; font: inherit;
}
#ai-chat-send:disabled { opacity: 0.5; cursor: wait; }

.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}
.tab {
  flex: 1;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 10px 8px;
  text-align: center;
  color: var(--muted);
}
.tab.active {
  color: var(--text);
  border-bottom-color: var(--accent);
  background: var(--panel-2);
}

.tab-panel {
  display: none;
  padding: 10px 12px;
  overflow: auto;
  flex: 1;
}
.tab-panel.active { display: block; }
.tab-panel h3 { margin: 4px 0 10px; }

.tab-panel label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin: 6px 0;
}
.tab-panel input[type="text"],
.tab-panel input[type="number"],
.tab-panel input[type="email"],
.tab-panel input[type="password"],
.tab-panel select {
  flex: 1;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 4px 6px;
  min-width: 60px;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 4px;
  margin: 8px 0;
  padding: 6px 8px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}
fieldset legend {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.reset-btn {
  padding: 1px 6px;
  font-size: 10px;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  text-transform: none;
  letter-spacing: 0;
}
.reset-btn:hover { color: var(--text); border-color: var(--accent); }

fieldset.stack {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
fieldset.stack label.inline {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 6px;
  justify-content: flex-start;
}
fieldset.stack button { width: 100%; }

.accordion {
  border: 1px solid var(--border);
  border-radius: 4px;
  margin: 10px 0;
  overflow: hidden;
}
.accordion-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
}
.accordion-toggle {
  flex: 1;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 0;
  padding: 4px 6px;
  text-align: left;
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
}
.accordion-toggle .chev {
  display: inline-block;
  width: 12px;
  transition: transform 120ms;
}
.accordion-toggle[aria-expanded="false"] .chev { transform: rotate(-90deg); }
.accordion-toggle .count {
  margin-left: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1px 8px;
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
}
.accordion .add {
  width: 28px;
  height: 26px;
  padding: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--muted);
  cursor: pointer;
}
.accordion .add:hover { color: var(--text); border-color: var(--accent); }
.accordion-body { padding: 6px 8px; }
.accordion[data-collapsed="true"] .accordion-body { display: none; }
.tiny { font-size: 11px; margin: 4px 0; }

.behavior-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.behavior-list li {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 3px;
}
.behavior-list li.active { border-color: var(--accent); background: rgba(77,154,255,0.12); }
.behavior-list .label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.behavior-list .sub { font-size: 10px; color: var(--muted); display: block; }
.behavior-list .mini {
  padding: 2px 6px;
  font-size: 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--muted);
  cursor: pointer;
}
.behavior-list .mini:hover { color: var(--text); border-color: var(--accent); }
.behavior-list .mini.danger { color: var(--danger); }
fieldset input { width: 100%; }

.filter-row {
  display: flex;
  gap: 4px;
  margin: 8px 0;
}
.filter-row button {
  flex: 1;
  text-align: center;
  padding: 4px 6px;
  font-size: 11px;
}
.filter-row button.active { background: var(--accent); color: #fff; border-color: var(--accent); }

#asset-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}
#asset-list li {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px;
  cursor: grab;
  text-align: center;
}
#asset-list li img {
  max-width: 100%;
  max-height: 60px;
  display: block;
  margin: 0 auto 4px;
}
#asset-list .asset-name {
  font-size: 10px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#asset-list .asset-actions { display: flex; gap: 2px; justify-content: center; margin-top: 2px; }
#asset-list .asset-actions button { padding: 2px 4px; font-size: 10px; flex: 1; }

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 22px;
  min-width: 300px;
  max-width: 80vw;
  max-height: 80vh;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.card h2, .card h3 { margin: 0 0 6px; }
.card label { display: flex; flex-direction: column; gap: 4px; }
.card input {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 6px 8px;
}
.error { color: var(--danger); min-height: 1em; margin: 0; }
.row { display: flex; justify-content: flex-end; gap: 6px; }

#modal-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 50vh;
  overflow: auto;
}
#modal-list li {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
}
#modal-list li:hover { background: var(--panel-2); }

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 4px;
  z-index: 2000;
}

.context-menu {
  position: fixed;
  min-width: 170px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 2px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.4);
}
.context-menu button {
  background: transparent;
  border: 0;
  text-align: left;
  padding: 6px 10px;
  border-radius: 3px;
}
.context-menu button:hover:not(:disabled) { background: var(--panel-2); }
.context-menu button:disabled { color: var(--muted); cursor: not-allowed; opacity: 0.6; }
.context-menu button.danger { color: var(--danger); }

#hierarchy-list .row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 6px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  user-select: none;
}
#hierarchy-list .row:hover { background: var(--panel-2); }
#hierarchy-list .row.selected { background: var(--accent); color: #fff; }
#hierarchy-list .indent { display: inline-block; width: 12px; }
#hierarchy-list .expand {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  padding: 0;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 3px;
  color: var(--muted);
  cursor: pointer;
}
#hierarchy-list .expand:hover:not(:disabled) {
  color: var(--text);
  border-color: var(--border);
  background: var(--panel);
}
#hierarchy-list .expand:disabled { cursor: default; opacity: 0.5; }
#hierarchy-list .row.selected .expand { color: #fff; }
#hierarchy-list .type {
  font-size: 10px;
  color: var(--muted);
  margin-left: auto;
}
#hierarchy-list .row.selected .type { color: rgba(255,255,255,0.8); }
#hierarchy-list li { padding: 0; }