:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-panel: #1e2a45;
  --bg-input: #0f1626;
  --border: #2a3a5c;
  --divider: #0a0f1c;
  --text: #e0e0e0;
  --text-dim: #8899aa;
  --accent: #00d4ff;
  --accent-dim: #0088aa;
  --highlight: rgba(0, 212, 255, 0.15);
  --danger: #ff4466;
  --banner-height: 40px;
  --left-width: 250px;
  --right-width: 262px;
  --timeline-height: 150px;
  --divider-width: 3px;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg-primary);
  overflow: hidden;
  height: 100vh;
  display: flex;
  flex-direction: column;
  user-select: none;
}

/* Banner */
#banner {
  height: var(--banner-height);
  background: var(--bg-secondary);
  border-bottom: var(--divider-width) solid var(--divider);
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

#banner-logo {
  width: var(--left-width);
  flex-shrink: 0;
  padding: 0 12px;
  border-right: var(--divider-width) solid var(--divider);
  height: 100%;
  display: flex;
  align-items: center;
}

.app-title {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.5px;
  color: var(--accent);
}

#banner-main {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  flex: 1;
  min-width: 0;
}

.banner-label {
  color: var(--text-dim);
}

.banner-info {
  color: var(--text-dim);
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

select {
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 4px 8px;
  font-size: 13px;
  min-width: 320px;
  max-width: 60vw;
}

select:focus {
  outline: 1px solid var(--accent);
}

.mode-btn {
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 3px 10px;
  font-size: 12px;
  cursor: pointer;
}

.mode-btn:hover:not(:disabled) {
  border-color: var(--accent-dim);
}

.mode-btn.active {
  background: var(--highlight);
  border-color: var(--accent);
  color: var(--accent);
}

.mode-btn:disabled {
  opacity: 0.45;
  cursor: default;
}

/* Main layout grid:
     col 1 = set list / parts / properties
     col 2 = timeline (spans cols 2-3) / preview
     col 3 = gfx page / palettes */
#layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: var(--left-width) minmax(0, 1fr) var(--right-width);
  grid-template-rows: var(--timeline-height) minmax(0, 1fr);
}

.panel {
  background: var(--bg-panel);
  min-width: 0;
  min-height: 0;
  position: relative;
}

#set-list-panel {
  grid-column: 1;
  grid-row: 1;
  border-right: var(--divider-width) solid var(--divider);
  border-bottom: var(--divider-width) solid var(--divider);
  display: flex;
}

#timeline-panel {
  grid-column: 2 / 4;
  grid-row: 1;
  border-bottom: var(--divider-width) solid var(--divider);
  display: flex;
  flex-direction: column;
}

#left-lower {
  grid-column: 1;
  grid-row: 2;
  border-right: var(--divider-width) solid var(--divider);
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: 0;
}

#parts-panel {
  border-bottom: var(--divider-width) solid var(--divider);
  display: flex;
}

#properties-panel {
  padding: 8px 12px;
}

#preview-panel {
  grid-column: 2;
  grid-row: 2;
  background: var(--bg-primary);
  overflow: hidden;
}

#preview-canvas {
  position: absolute;
  inset: 0;
  display: block;
  cursor: grab;
}

#right-lower {
  grid-column: 3;
  grid-row: 2;
  border-left: var(--divider-width) solid var(--divider);
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: auto;
}

#gfx-panel,
#palette-panel {
  flex-shrink: 0;
}

#gfx-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 3px;
  background: var(--bg-secondary);
}

#gfx-canvas,
#palette-canvas {
  display: block;
  width: 256px;
  image-rendering: pixelated;
  cursor: pointer;
}

#gfx-canvas {
  height: 256px;
}

#palette-canvas {
  height: 128px;
}

/* Text lists */
.text-list {
  flex: 1;
  overflow: auto;
  padding: 6px 8px;
  font-family: Consolas, 'Courier New', monospace;
  font-size: 12px;
  line-height: 1.5;
}

.text-row {
  white-space: nowrap;
  padding: 0 4px;
  border-radius: 2px;
  cursor: pointer;
}

.text-row:hover {
  background: rgba(255, 255, 255, 0.06);
}

.text-row.selected {
  background: var(--highlight);
  color: var(--accent);
}

.text-empty {
  color: var(--text-dim);
  font-style: italic;
}

/* Timeline */
#timeline-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 28px;
  padding: 0 8px;
  background: var(--bg-secondary);
  flex-shrink: 0;
}

#timeline-title {
  color: var(--text-dim);
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.timeline-strip {
  flex: 1;
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 6px;
  padding: 6px 8px;
  overflow-x: auto;
  overflow-y: hidden;
}

.timeline-cell {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 3px 6px;
  border: 1px solid transparent;
  border-radius: 3px;
  cursor: pointer;
  font-family: Consolas, 'Courier New', monospace;
  font-size: 11px;
}

.timeline-cell:hover {
  background: rgba(255, 255, 255, 0.06);
}

.timeline-cell.selected {
  background: var(--highlight);
  border-color: var(--accent);
}

.timeline-cell canvas {
  display: block;
  image-rendering: pixelated;
  background: #2f7b80;
  align-self: flex-start;
}

/* Properties */
.prop-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  line-height: 1.55;
}

.prop-name {
  color: var(--text-dim);
}

.prop-value {
  font-family: Consolas, 'Courier New', monospace;
  text-align: right;
}

.prop-heading {
  margin-top: 6px;
  color: var(--accent-dim);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.prop-heading:first-child {
  margin-top: 0;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}