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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #121826;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #fff;
  user-select: none;
}

#canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

#ui-header {
  position: absolute;
  top: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
  z-index: 10;
}

.brand-badge {
  pointer-events: auto;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  padding: 8px 16px;
  border-radius: 9999px;
  border: 1px solid rgba(139, 92, 246, 0.3);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.brand-badge h1 {
  font-size: 16px;
  font-weight: 700;
  background: linear-gradient(135deg, #a78bfa, #f472b6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.brand-badge span {
  font-size: 12px;
  color: #94a3b8;
  margin-left: 8px;
}

.header-controls {
  pointer-events: auto;
  display: flex;
  gap: 8px;
}

.tool-btn {
  background: rgba(30, 41, 59, 0.85);
  backdrop-filter: blur(8px);
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.tool-btn:hover {
  background: rgba(51, 65, 85, 0.95);
  border-color: #8b5cf6;
  color: #fff;
}

.tool-btn.active {
  background: #7c3aed;
  border-color: #a78bfa;
  color: #fff;
}

#palette-bar {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(12px);
  padding: 8px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  z-index: 10;
  max-width: 95vw;
  overflow-x: auto;
}

.color-option {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
  flex-shrink: 0;
  position: relative;
}

.color-option:hover {
  transform: scale(1.1);
}

.color-option.selected {
  border-color: #fff;
  transform: scale(1.15);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

#stats-info {
  position: absolute;
  bottom: 24px;
  left: 20px;
  background: rgba(15, 23, 42, 0.75);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 12px;
  color: #94a3b8;
  pointer-events: none;
  z-index: 5;
}

#help-tooltip {
  position: absolute;
  bottom: 84px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 23, 42, 0.85);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  color: #cbd5e1;
  pointer-events: none;
  z-index: 5;
  transition: opacity 0.3s ease;
}

@media (max-width: 640px) {
  #ui-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .brand-badge h1 {
    font-size: 14px;
  }
  .tool-btn {
    padding: 6px 10px;
    font-size: 12px;
  }
  #help-tooltip {
    display: none;
  }
  #palette-bar {
    bottom: 12px;
  }
}