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

body {
  background: #1a1a2e;
  color: #e0e0f0;
  font-family: 'Segoe UI', sans-serif;
  font-size: 13px;
  height: 100vh;
  overflow: hidden;
}

#app {
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* ── Sidebar ── */
#sidebar {
  width: 230px;
  min-width: 230px;
  background: #16213e;
  border-right: 1px solid #0f3460;
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

#sidebar h2 {
  text-align: center;
  font-size: 15px;
  color: #a0c4ff;
  padding: 6px 0 4px;
  border-bottom: 1px solid #0f3460;
  margin-bottom: 2px;
}

.panel {
  background: #0f3460;
  border-radius: 6px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.panel h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #7eb8f7;
  margin-bottom: 2px;
}

/* Tools */
#tool-buttons {
  display: flex;
  gap: 4px;
}

.tool-btn {
  flex: 1;
  padding: 4px 2px;
  background: #1a1a2e;
  border: 1px solid #0f3460;
  color: #c0d0f0;
  border-radius: 4px;
  cursor: pointer;
  font-size: 11px;
  transition: background 0.15s;
}

.tool-btn:hover {
  background: #253060;
}

.tool-btn.active {
  background: #e94560;
  border-color: #e94560;
  color: #fff;
}

#color-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

#color-row label {
  display: flex;
  align-items: center;
  gap: 4px;
}

input[type='color'] {
  width: 32px;
  height: 22px;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  padding: 0;
  background: none;
}

input[type='range'] {
  width: 70px;
  accent-color: #a0c4ff;
}

#palette {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.swatch {
  width: 20px;
  height: 20px;
  border-radius: 3px;
  cursor: pointer;
  border: 2px solid transparent;
  transition:
    border-color 0.1s,
    transform 0.1s;
}

.swatch:hover {
  transform: scale(1.2);
  border-color: #fff;
}

.swatch.active {
  border-color: #fff;
}

/* Toggles */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 2px 0;
}

.toggle-row input[type='checkbox'] {
  accent-color: #a0c4ff;
  width: 14px;
  height: 14px;
}

/* Selects & buttons */
select {
  background: #1a1a2e;
  color: #e0e0f0;
  border: 1px solid #0f3460;
  border-radius: 4px;
  padding: 2px 4px;
  font-size: 12px;
}

button {
  background: #1a1a2e;
  color: #c0d0f0;
  border: 1px solid #0f3460;
  border-radius: 4px;
  padding: 4px 8px;
  cursor: pointer;
  font-size: 12px;
  transition: background 0.15s;
}

button:hover {
  background: #253060;
}

#diff-controls,
#canvas-controls {
  display: flex;
  gap: 4px;
}

#btn-play {
  color: #88ff88;
}

#btn-stop {
  color: #ff8888;
}

#btn-step {
  color: #88ccff;
}

label {
  display: flex;
  align-items: center;
  gap: 5px;
}

#info-text {
  font-size: 11px;
  color: #a0b0d0;
  min-height: 30px;
  line-height: 1.5;
}

/* ── Canvas Area ── */
#canvas-area {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #12122a;
  overflow: hidden;
}

#main-canvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  cursor: crosshair;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.8);
}

/* Scrollbar */
#sidebar::-webkit-scrollbar {
  width: 5px;
}

#sidebar::-webkit-scrollbar-track {
  background: #0f3460;
}

#sidebar::-webkit-scrollbar-thumb {
  background: #a0c4ff44;
  border-radius: 3px;
}

/* Append: rotation toggle styling */
.rot-section {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.rot-label {
  font-size: 11px;
  opacity: 0.7;
  margin-bottom: 6px;
}

#rot-toggles {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.rot-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 4px 2px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  cursor: pointer;
  font-size: 11px;
  user-select: none;
}

.rot-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
}

.rot-toggle.active {
  background: rgba(80, 160, 255, 0.25);
  border-color: rgba(80, 160, 255, 0.6);
}

.rot-toggle input {
  margin: 0;
  transform: scale(0.85);
}

.rot-actions {
  display: flex;
  gap: 4px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.mini-btn {
  flex: 1;
  min-width: 40px;
  padding: 3px 6px;
  font-size: 11px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: inherit;
  border-radius: 3px;
  cursor: pointer;
}

.mini-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}