:root {
  --bg: #1a1a1a;
  --bg-elev: #242424;
  --bg-input: #2f2f2f;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f1f1f1;
  --text-muted: rgba(255, 255, 255, 0.55);
  --accent: #d4a24c;
  --accent-pressed: #b88934;
  --danger: #d4564c;
  --radius: 14px;
  --radius-sm: 8px;
  --safe-top: env(safe-area-inset-top, 0);
  --safe-bottom: env(safe-area-inset-bottom, 0);
  --safe-left: env(safe-area-inset-left, 0);
  --safe-right: env(safe-area-inset-right, 0);
  --tray-h: 168px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-user-select: none;
  overscroll-behavior: none;
}

button {
  font: inherit;
  color: inherit;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  min-height: 44px;
  cursor: pointer;
}
button:active { background: var(--bg-input); }
button.primary { background: var(--accent); color: #1a1a1a; border-color: transparent; font-weight: 600; }
button.primary:active { background: var(--accent-pressed); }
button.ghost { background: transparent; border-color: var(--border); }

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

#app {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
}

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}

.screen-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: calc(var(--safe-top) + 8px) 16px 8px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.screen-header h1 {
  font-size: 17px;
  font-weight: 600;
  margin: 0;
  flex: 1;
  text-align: center;
}
.screen-header .back {
  background: transparent;
  border: none;
  padding: 8px 4px;
  min-width: 44px;
  text-align: left;
  color: var(--accent);
}
.screen-header .action {
  background: transparent;
  border: none;
  padding: 8px 4px;
  min-width: 44px;
  text-align: right;
  color: var(--accent);
}

.screen-body {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 16px;
  padding-bottom: calc(16px + var(--safe-bottom));
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  height: 100%;
  text-align: center;
  color: var(--text-muted);
}
.empty-state h2 { color: var(--text); margin: 0; font-size: 22px; }
.empty-state p { margin: 0; max-width: 280px; line-height: 1.4; }

.thumb-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 12px;
}
.thumb {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-elev);
  border: 2px solid transparent;
  cursor: pointer;
}
.thumb.selected { border-color: var(--accent); }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb-label {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 6px 8px;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  font-size: 12px;
  color: var(--text);
  text-align: center;
}
.thumb-delete {
  position: absolute;
  top: 6px; right: 6px;
  width: 26px; height: 26px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 16px;
  line-height: 1;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}
.thumb-delete:hover { background: rgba(220, 50, 50, 0.85); }
.thumb-delete:focus-visible { outline: 2px solid var(--accent); }

.thumb.no-bg {
  background-color: #1a1a1a;
  background-image:
    linear-gradient(45deg, #2d2d2d 25%, transparent 25%),
    linear-gradient(-45deg, #2d2d2d 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2d2d2d 75%),
    linear-gradient(-45deg, transparent 75%, #2d2d2d 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}
.thumb.solid {
  background: linear-gradient(135deg, #ff5a5a 0%, #ffcc33 25%, #55e08a 50%, #4fb8ff 75%, #b070ff 100%);
}

.editor-stage.no-bg {
  background-color: #1a1a1a;
  background-image:
    linear-gradient(45deg, #2d2d2d 25%, transparent 25%),
    linear-gradient(-45deg, #2d2d2d 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2d2d2d 75%),
    linear-gradient(-45deg, transparent 75%, #2d2d2d 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
}

/* Editor */
.editor-stage {
  position: absolute;
  inset: calc(var(--safe-top) + 44px) 0 var(--tray-h) 0;
  overflow: hidden;
  background: #000;
  touch-action: none;
}
.editor-room {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
  user-select: none;
}
.editor-painting {
  position: absolute;
  top: 50%;
  left: 50%;
  /* content-box so width/height define the painting area; border (the frame)
     extends OUTSIDE — matches the export-canvas geometry. */
  box-sizing: content-box;
  transform-origin: center center;
  will-change: transform;
  user-select: none;
  -webkit-user-drag: none;
}
.editor-painting img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
  -webkit-user-drag: none;
}
.editor-painting.framed {
  border-style: solid;
  border-image-repeat: round;
}

.editor-tray {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: var(--tray-h);
  padding-bottom: var(--safe-bottom);
  background: var(--bg-elev);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}
.tray-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}
.tray-tab {
  flex: 1;
  background: transparent;
  border: none;
  border-radius: 0;
  border-bottom: 2px solid transparent;
  padding: 12px 4px;
  color: var(--text-muted);
  font-size: 13px;
  min-height: 44px;
}
.tray-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.tray-content {
  flex: 1;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 8px 12px;
  -webkit-overflow-scrolling: touch;
  display: flex;
  align-items: center;
  gap: 10px;
}
.tray-content.column {
  flex-direction: column;
  align-items: stretch;
  overflow-x: hidden;
  overflow-y: auto;
  gap: 6px;
}
.mini-thumb {
  flex: 0 0 auto;
  width: 64px;
  height: 64px;
  border-radius: 8px;
  border: 2px solid transparent;
  background: var(--bg-input);
  overflow: hidden;
  cursor: pointer;
}
.mini-thumb.selected { border-color: var(--accent); }
.mini-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.mini-thumb.add {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--text-muted);
}

.editor-topbar {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: calc(var(--safe-top) + 44px);
  padding: var(--safe-top) 12px 0;
  background: linear-gradient(rgba(0,0,0,0.6), transparent);
  display: flex;
  align-items: center;
  z-index: 2;
}
.editor-topbar button {
  background: transparent;
  border: none;
  color: var(--text);
  padding: 8px 12px;
  min-height: 44px;
}
.editor-topbar .spacer { flex: 1; }

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
  padding: 4px 0;
}
.slider-row label { width: 64px; flex: 0 0 auto; }
.slider-row input { flex: 1; }

.toast {
  position: fixed;
  top: calc(var(--safe-top) + 60px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.85);
  color: #fff;
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 14px;
  z-index: 10;
  pointer-events: none;
  opacity: 0;
  transition: opacity 200ms;
}
.toast.show { opacity: 1; }

.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid rgba(255,255,255,0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
}