.tool-main-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 1.25rem;
  max-width: 480px;
  margin: 0 auto;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  box-shadow: var(--shadow-base);
}

.lume-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-base);
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Lume canvas */
.lume-canvas-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.lume-canvas-wrapper canvas {
  border-radius: 1rem;
  max-width: 100%;
}

/* Preset grid */
.preset-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.preset-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 0.6rem 0.5rem;
  background: var(--bg-page);
  border: 2px solid var(--border-base);
  border-radius: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.preset-btn:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 5%, var(--bg-page));
}

.preset-btn.active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-page));
  box-shadow: 0 0 0 1px var(--accent);
}

.preset-swatch {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--border-base);
  flex-shrink: 0;
}

.preset-name {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-base);
  text-align: center;
  line-height: 1.2;
}

.preset-desc {
  font-size: 0.6rem;
  color: var(--text-base);
  opacity: 0.5;
  text-align: center;
}

/* Brightness slider */
.slider-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.slider-icon {
  font-size: 1rem;
  opacity: 0.5;
  color: var(--text-base);
}

.slider-row input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border-base);
  border-radius: 2px;
  outline: none;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg-surface);
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.slider-row input[type="range"]::-moz-range-thumb {
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg-surface);
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

/* Color info */
.color-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  padding: 0.75rem;
  background: var(--bg-page);
  border: 1px solid var(--border-base);
  border-radius: 0.75rem;
}

.color-info-item {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.color-info-label {
  font-size: 0.6rem;
  font-weight: 600;
  color: var(--text-base);
  opacity: 0.5;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.color-info-value {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-base);
  font-variant-numeric: tabular-nums;
}

.tip-row {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-page);
  border-radius: 0.75rem;
  border: 1px solid var(--border-base);
}

.tip-icon {
  flex-shrink: 0;
  margin-top: 0.1rem;
  color: var(--accent);
}

.tip-text {
  font-size: 0.8rem;
  color: var(--text-base);
  opacity: 0.85;
  line-height: 1.5;
}

@media (max-width: 520px) {
  .tool-main-card {
    padding: 1rem;
  }
  .preset-grid {
    grid-template-columns: 1fr 1fr;
  }
}