:root {
  --bg: #14161a;
  --panel: #1c1f26;
  --panel-border: #2c3038;
  --text: #e6e8ec;
  --text-dim: #9aa0ac;
  --accent: #6fbf5f;
  --accent-dim: #4a7a3f;
  --danger: #c05050;
}

* { box-sizing: border-box; }

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

.topbar {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--panel-border);
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.topbar h1 {
  font-size: 1.15rem;
  margin: 0;
  color: var(--accent);
}

.subtitle {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.layout {
  display: grid;
  grid-template-columns: 260px 1fr 1fr;
  gap: 1rem;
  padding: 1rem;
  align-items: start;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 1rem;
}

.panel h2 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin: 0 0 0.75rem 0;
}

.panel h2:not(:first-child) {
  margin-top: 1.25rem;
}

.tool-group {
  margin-bottom: 0.9rem;
}

.tool-group label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.3rem;
}

.tool-group input[type="color"] {
  width: 100%;
  height: 36px;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  background: none;
  padding: 2px;
}

.tool-group input[type="range"] {
  width: 100%;
}

.tool-group.buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

button {
  background: var(--accent-dim);
  color: var(--text);
  border: none;
  border-radius: 6px;
  padding: 0.5rem 0.8rem;
  font-size: 0.85rem;
  cursor: pointer;
  flex: 1 1 auto;
}

button:hover {
  background: var(--accent);
}

button.danger {
  background: #3a2020;
}

button.danger:hover {
  background: var(--danger);
}

button.active {
  outline: 2px solid var(--accent);
}

.hint {
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.4;
}

.canvas-wrap, .preview-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}

#paintCanvas {
  width: 100%;
  max-width: 512px;
  aspect-ratio: 1 / 1;
  image-rendering: pixelated;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  cursor: crosshair;
  touch-action: none;
}

#threeContainer {
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  overflow: hidden;
}

#threeContainer canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}