.tool-page-header {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--text);
}

.tool-page-header h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tool-page-header p {
  color: var(--text-secondary);
  margin-top: 0.5rem;
  max-width: 700px;
}

.tool-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.tool-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.tool-panel-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.375rem;
  color: var(--text);
}

.form-select, .form-input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.625rem 0.875rem;
  color: var(--text);
  font-size: 0.9rem;
  transition: border-color 0.2s ease;
}

.form-select:focus, .form-input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%235c6470' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.5rem;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  outline: none;
  flex: 1;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  border: none;
  cursor: pointer;
}

.range-value {
  display: inline-block;
  background: var(--surface-hover);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  min-width: 50px;
  text-align: center;
}

.code-output {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem;
  font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  font-size: 0.8rem;
  line-height: 1.7;
  word-break: break-all;
  color: var(--text);
  white-space: pre-wrap;
}

.output-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.version-select-group {
  position: relative;
}

.version-select-group .loading-spinner {
  position: absolute;
  right: 40px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.85rem;
  display: none;
}

.version-select-group .loading-spinner.active {
  display: block;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: translateY(-50%) rotate(0deg); }
  to { transform: translateY(-50%) rotate(360deg); }
}

.version-status {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.preset-section {
  margin-bottom: 2rem;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.preset-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.preset-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.preset-card.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-light);
}

.preset-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
  font-size: 1rem;
  color: var(--accent);
}

.preset-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.preset-card p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.preset-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--accent-light);
  color: var(--accent);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.03em;
}

.advanced-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  margin-bottom: 1.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  user-select: none;
}

.advanced-toggle:hover {
  border-color: var(--accent);
  color: var(--text);
  background: var(--surface-hover);
}

.advanced-toggle i {
  font-size: 0.8rem;
  transition: transform 0.3s ease;
}

.advanced-toggle.open i {
  transform: rotate(180deg);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.75rem;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.checkbox-label span {
  flex: 1;
}

@media (max-width: 768px) {
  .tool-layout {
    grid-template-columns: 1fr;
  }
  
  .preset-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
}