.tool-section {
  padding: 2rem 0 4rem;
}

.tool-container {
  width: min(100% - 2rem, 900px);
  margin: 0 auto;
}

.tool-controls,
.tool-preview,
.tool-result,
.merge-file-list {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 28%), var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 1.5rem;
}

.tool-controls {
  display: grid;
  gap: 1.25rem;
}

.tool-preview {
  min-height: 360px;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at top, rgba(245, 158, 11, 0.06), transparent 36%),
    #0e0e0e;
}

.tool-result {
  display: grid;
  gap: 1rem;
}

.merge-file-list {
  display: grid;
  gap: 0.75rem;
}

.tab-group {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.35rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.tab-btn {
  padding: 0.7rem 1rem;
  border-radius: 999px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(245, 158, 11, 0.25);
}

.tab-content {
  display: none;
  margin-top: 1.25rem;
}

.tab-content.active {
  display: block;
}

.slider-group {
  display: grid;
  gap: 0.75rem;
}

.slider-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.slider-group label {
  color: var(--text-primary);
  font-weight: 600;
}

.slider-value {
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 600;
}

.slider-group input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

.color-picker-group {
  display: grid;
  gap: 0.9rem;
}

.color-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.color-swatch {
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--border-hover);
  border-radius: 999px;
  cursor: pointer;
  transition: var(--transition);
}

.color-swatch:hover,
.color-swatch.active {
  transform: scale(1.05);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.color-picker-group input[type="text"],
.color-picker-group input[type="color"] {
  width: 100%;
  min-height: 46px;
  padding: 0.8rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  background: #0d0d0d;
  color: var(--text-primary);
}

.position-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.6rem;
}

.position-cell {
  display: grid;
  place-items: center;
  min-height: 72px;
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.position-cell:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.position-cell.active {
  border-color: rgba(245, 158, 11, 0.45);
  background: rgba(245, 158, 11, 0.1);
  color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(245, 158, 11, 0.18);
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.toggle-switch {
  position: relative;
  width: 52px;
  height: 30px;
  border-radius: 999px;
  background: #27272a;
  cursor: pointer;
  transition: var(--transition);
}

.toggle-switch::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  transition: var(--transition);
}

.toggle-switch.on {
  background: var(--accent);
}

.toggle-switch.on::after {
  left: calc(100% - 26px);
}

@media (max-width: 768px) {
  .tool-section {
    padding-bottom: 3rem;
  }

  .tool-container {
    width: min(100% - 1.5rem, 900px);
  }

  .tool-controls,
  .tool-preview,
  .tool-result,
  .merge-file-list {
    padding: 1.2rem;
  }

  .position-cell {
    min-height: 62px;
  }
}

@media (max-width: 480px) {
  .tab-group {
    width: 100%;
    border-radius: var(--radius-card);
  }

  .tab-btn {
    flex: 1 1 calc(50% - 0.25rem);
    text-align: center;
  }

  .position-grid {
    gap: 0.45rem;
  }
}