*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, sans-serif;
  background: #0a0a0a;
  color: #fafafa;
  overflow: hidden;
}

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

#ui {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: #111;
  border-bottom: 1px solid #222;
  flex-wrap: wrap;
  flex-shrink: 0;
}

#tools {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}

.tool-btn {
  padding: 5px 13px;
  border: 2px solid #333;
  background: #1a1a1a;
  color: #999;
  cursor: pointer;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.03em;
  transition: border-color 0.15s, color 0.15s;
}

.tool-btn:hover { border-color: #666; color: #eee; }

.tool-btn[data-mat="1"].active { border-color: #d4a84b; color: #d4a84b; background: #1a1600; }
.tool-btn[data-mat="2"].active { border-color: #4a9eff; color: #4a9eff; background: #001525; }
.tool-btn[data-mat="3"].active { border-color: #888; color: #ccc; background: #181818; }
.tool-btn[data-mat="4"].active { border-color: #ff6600; color: #ff8822; background: #1a0800; }
.tool-btn[data-mat="0"].active { border-color: #cc4444; color: #ee6666; background: #1a0505; }

.size-label {
  font-size: 12px;
  color: #666;
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.size-label input[type="range"] {
  width: 70px;
  accent-color: #d4a84b;
}

#brush-val {
  width: 16px;
  text-align: right;
  color: #aaa;
}

#clear {
  padding: 5px 12px;
  border: 2px solid #333;
  background: #1a1a1a;
  color: #777;
  cursor: pointer;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  transition: border-color 0.15s, color 0.15s;
  margin-left: auto;
}

#clear:hover { border-color: #cc4444; color: #ee6666; }

#canvas {
  display: block;
  cursor: crosshair;
  background: #080808;
  flex: 1;
  width: 100%;
}