:root {
  --bg: #20242b;
  --panel: #2a3039;
  --panel-2: #353c47;
  --line: #4a5362;
  --text: #eef2f6;
  --muted: #aeb8c6;
  --accent: #41a3ff;
  --danger: #ff6b6b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow: hidden;
}

button, input, select {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 6px;
  padding: 7px 10px;
  cursor: pointer;
}

button:hover, button.active {
  border-color: var(--accent);
  background: #254967;
}

.app-shell {
  display: grid;
  grid-template-columns: 96px minmax(320px, 1fr) 310px;
  grid-template-rows: 52px minmax(300px, 1fr) 132px;
  height: 100vh;
}

.topbar {
  grid-column: 1 / 4;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line);
  background: #252b33;
  white-space: nowrap;
}

.brand {
  font-weight: 700;
  margin-right: 8px;
}

.toolbar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  border-right: 1px solid var(--line);
  background: var(--panel);
}

.tool-button {
  min-height: 38px;
}

.control-block {
  display: grid;
  gap: 4px;
  color: var(--muted);
  font-size: 12px;
}

.control-block input, .color-row input[type="text"], .frame-duration, .layer-name, .layer-opacity, .layer-blend,
.mini-grid input, .mini-grid select, .mini-label select {
  width: 100%;
  border: 1px solid var(--line);
  background: #171a20;
  color: var(--text);
  border-radius: 5px;
  padding: 6px;
}

.canvas-area {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: auto;
  background: #181b20;
}

.view-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 8px 10px;
  border-bottom: 1px solid #11151b;
  background: #1e232b;
  color: var(--muted);
  font-size: 12px;
}

.view-toolbar label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.view-toolbar input[type="range"] {
  width: 132px;
}

.canvas-stage {
  min-height: 0;
  padding: 0;
  overflow: hidden;
}

#pixelCanvas {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: transparent;
  cursor: crosshair;
}

.right-panel {
  overflow: auto;
  border-left: 1px solid var(--line);
  background: var(--panel);
  padding: 10px;
}

.panel {
  margin-bottom: 14px;
}

.panel h2, .panel h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

.panel h3 {
  color: var(--muted);
  font-size: 12px;
  margin-top: 12px;
}

.panel-title-row, .color-row, .layer-actions, .timeline-controls, .selection-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.color-row input[type="color"] {
  width: 44px;
  height: 36px;
  border: 1px solid var(--line);
  background: var(--panel-2);
}

.color-preview-row {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}

.current-color-preview {
  width: 42px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #2d6cdf;
}

.native-color {
  width: 100%;
  height: 34px;
  margin-bottom: 8px;
  border: 1px solid var(--line);
  background: var(--panel-2);
}

.color-square {
  display: block;
  width: 100%;
  height: 140px;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: crosshair;
  margin-bottom: 8px;
}

.hue-slider {
  width: 100%;
  margin-bottom: 10px;
  accent-color: #ff2bb3;
}

.preview-box {
  display: grid;
  place-items: center;
  min-height: 170px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #171a20;
}

#previewCanvas {
  width: 160px;
  height: 160px;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.import-preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 8px 0;
}

.import-preview-grid h3 {
  margin: 0 0 5px;
}

#importBeforeCanvas,
#importAfterCanvas {
  width: 100%;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 6px;
  background:
    linear-gradient(45deg, #bbb 25%, transparent 25%),
    linear-gradient(-45deg, #bbb 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #bbb 75%),
    linear-gradient(-45deg, transparent 75%, #bbb 75%);
  background-color: #f4f5f6;
  background-size: 10px 10px;
  background-position: 0 0, 0 5px, 5px -5px, -5px 0;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.swatch-grid {
  display: grid;
  grid-template-columns: repeat(8, 28px);
  gap: 6px;
}

.swatch-grid.compact {
  grid-template-columns: repeat(8, 24px);
}

.swatch {
  width: 28px;
  height: 28px;
  border: 1px solid var(--line);
  border-radius: 5px;
  cursor: pointer;
  background-image:
    linear-gradient(45deg, #bbb 25%, transparent 25%),
    linear-gradient(-45deg, #bbb 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #bbb 75%),
    linear-gradient(-45deg, transparent 75%, #bbb 75%);
  background-size: 10px 10px;
  background-position: 0 0, 0 5px, 5px -5px, -5px 0;
  padding: 0;
}

.swatch span {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 4px;
}

.list {
  display: grid;
  gap: 8px;
  margin-top: 8px;
}

.layer-item, .frame-item {
  border: 1px solid var(--line);
  background: #222831;
  border-radius: 6px;
  padding: 8px;
}

.layer-item.active, .frame-item.active {
  border-color: var(--accent);
  background: #243a4d;
}

.layer-top {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.timeline {
  grid-column: 1 / 4;
  border-top: 1px solid var(--line);
  background: #252b33;
  padding: 10px;
  overflow: hidden;
}

.frame-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 8px;
}

.frame-item {
  min-width: 112px;
}

.frame-item label {
  display: grid;
  gap: 4px;
  color: var(--muted);
  font-size: 12px;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--muted);
}

.compact-toggle, .range-label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--muted);
}

.selection-actions button,
.layer-actions button {
  padding: 6px 9px;
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 8px 0;
}

.mini-grid label,
.mini-label {
  display: grid;
  gap: 4px;
  color: var(--muted);
  font-size: 12px;
}

.direction-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 5px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}

.direction-grid label {
  display: flex;
  align-items: center;
  gap: 3px;
}

.tile-palette {
  display: grid;
  grid-template-columns: repeat(4, 54px);
  gap: 8px;
  margin-top: 8px;
}

.tile-chip {
  width: 54px;
  height: 54px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #171a20;
  image-rendering: pixelated;
  cursor: pointer;
}

.tile-chip.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(65, 163, 255, 0.25);
}

@media (max-width: 860px) {
  body { overflow: auto; }
  .app-shell {
    min-height: 100vh;
    height: auto;
    grid-template-columns: 76px minmax(280px, 1fr);
    grid-template-rows: auto minmax(360px, 1fr) auto auto;
  }
  .topbar, .timeline { grid-column: 1 / 3; }
  .right-panel {
    grid-column: 1 / 3;
    border-left: 0;
    border-top: 1px solid var(--line);
  }
}