/* ============================================================================
   Visor: Tool Chain Builder
   BEM block: .visor-toolchain
   Replaces: .visor-toolchain-panel, .toolchain-panel-header,
             .toolchain-panel-title, .toolchain-panel-title-text,
             .toolchain-panel-actions, .toolchain-action-btn,
             .toolchain-action-primary, .toolchain-panel-close,
             .toolchain-panel-content, .toolchain-palette,
             .toolchain-palette-header, .toolchain-palette-search,
             .toolchain-palette-categories, .toolchain-category-btn,
             .toolchain-palette-tools, .toolchain-tool-item,
             .toolchain-tool-icon, .toolchain-tool-name,
             .toolchain-tool-locality, .toolchain-canvas,
             .toolchain-canvas-header, .toolchain-canvas-title,
             .toolchain-canvas-actions, .toolchain-canvas-area,
             .toolchain-dropzone, .toolchain-dropzone-hint,
             .toolchain-nodes, .toolchain-node, .toolchain-node-handle,
             .toolchain-node-info, .toolchain-node-name,
             .toolchain-node-type, .toolchain-node-remove,
             .toolchain-connection-line, .toolchain-connections,
             .toolchain-validation, .toolchain-config,
             .toolchain-config-header, .toolchain-config-title,
             .toolchain-config-content, .toolchain-config-empty,
             .toolchain-config-form, .toolchain-config-field,
             .toolchain-config-label, .toolchain-config-input,
             .toolchain-config-select, .toolchain-config-types,
             .toolchain-results, .toolchain-results-header,
             .toolchain-results-title, .toolchain-results-close,
             .toolchain-results-content, .toolchain-result-step
   ============================================================================ */

@scope (beam-visor) {

  /* -- Block ---------------------------------------------------------------- */

  .visor-toolchain {
    display: none;
    position: absolute;
    top: 3rem;
    left: 0;
    right: 0;
    bottom: 3.5rem;
    background: var(--color-bg);
    border-top: 2px solid var(--color-warning);
    z-index: 12;
    flex-direction: column;
  }

  .visor-toolchain.visible {
    display: flex;
  }

  /* -- Header --------------------------------------------------------------- */

  .visor-toolchain__header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: linear-gradient(135deg, color-mix(in srgb, var(--color-warning) 15%, var(--color-bg)), var(--color-bg));
    border-bottom: 1px solid var(--color-border);
  }

  .visor-toolchain__title {
    display: flex;
    align-items: center;
  }

  .visor-toolchain__title svg {
    width: 14px;
    height: 14px;
    color: var(--color-warning);
  }

  .visor-toolchain__title-text {
    font-weight: var(--weight-semibold);
    font-size: 0.8rem;
    color: var(--color-warning);
  }

  .visor-toolchain__actions {
    display: flex;
    gap: var(--space-sm);
    margin-left: auto;
  }

  .visor-toolchain__action-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.6rem;
    font-size: 0.7rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-fast);
  }

  .visor-toolchain__action-btn svg {
    width: 12px;
    height: 12px;
  }

  .visor-toolchain__action-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
  }

  .visor-toolchain__action-btn--primary {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
  }

  .visor-toolchain__action-btn--primary:hover {
    filter: brightness(1.1);
  }

  .visor-toolchain__close {
    background: none;
    border: none;
    color: var(--color-muted);
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: var(--space-sm);
  }

  .visor-toolchain__close:hover {
    color: var(--color-text);
  }

  /* -- Content (3-column layout) -------------------------------------------- */

  .visor-toolchain__content {
    flex: 1;
    display: flex;
    overflow: hidden;
  }

  /* -- Palette (left column) ------------------------------------------------ */

  .visor-toolchain__palette {
    width: 200px;
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
  }

  .visor-toolchain__palette-header {
    padding: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
  }

  .visor-toolchain__palette-search {
    width: 100%;
    padding: 0.4rem var(--space-sm);
    font-size: 0.7rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
  }

  .visor-toolchain__palette-search:focus {
    outline: none;
    border-color: var(--color-accent);
  }

  .visor-toolchain__palette-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    padding: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
  }

  .visor-toolchain__category-btn {
    padding: 0.25rem var(--space-sm);
    font-size: 0.6rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 3px;
    color: var(--color-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
  }

  .visor-toolchain__category-btn:hover,
  .visor-toolchain__category-btn.active {
    border-color: var(--color-accent);
    color: var(--color-accent);
  }

  .visor-toolchain__palette-tools {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-sm);
  }

  .visor-toolchain__tool-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    margin-bottom: 0.35rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: grab;
    transition: all var(--transition-fast);
  }

  .visor-toolchain__tool-item:hover {
    border-color: var(--color-accent);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }

  .visor-toolchain__tool-item:active {
    cursor: grabbing;
  }

  .visor-toolchain__tool-item.dragging {
    opacity: 0.5;
  }

  .visor-toolchain__tool-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
  }

  .visor-toolchain__tool-icon svg {
    width: 14px;
    height: 14px;
  }

  .visor-toolchain__tool-info {
    flex: 1;
    min-width: 0;
  }

  .visor-toolchain__tool-name {
    font-size: 0.7rem;
    font-weight: var(--weight-semibold);
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .visor-toolchain__tool-locality {
    font-size: 0.6rem;
    color: var(--color-muted);
  }

  /* -- Canvas (center column) ----------------------------------------------- */

  .visor-toolchain__canvas {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
    position: relative;
  }

  .visor-toolchain__canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
  }

  .visor-toolchain__canvas-title {
    font-size: 0.75rem;
    font-weight: var(--weight-semibold);
    color: var(--color-text);
  }

  .visor-toolchain__canvas-actions {
    font-size: 0.65rem;
    color: var(--color-muted);
  }

  .visor-toolchain__canvas-area {
    flex: 1;
    position: relative;
    overflow: auto;
    padding: var(--space-lg);
  }

  /* -- Dropzone ------------------------------------------------------------- */

  .visor-toolchain__dropzone {
    position: absolute;
    inset: var(--space-lg);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
  }

  .visor-toolchain__dropzone--drag-over {
    border-color: var(--color-accent);
    background: color-mix(in srgb, var(--color-accent) 5%, transparent);
  }

  .visor-toolchain__dropzone-hint {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-muted);
    font-size: 0.75rem;
  }

  .visor-toolchain__dropzone-hint svg {
    width: 24px;
    height: 24px;
  }

  .visor-toolchain__dropzone.has-nodes {
    display: none;
  }

  /* -- Nodes ---------------------------------------------------------------- */

  .visor-toolchain__nodes {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    min-height: 100%;
  }

  .visor-toolchain__node {
    display: flex;
    align-items: stretch;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
  }

  .visor-toolchain__node:hover {
    border-color: var(--color-accent);
  }

  .visor-toolchain__node--selected {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 20%, transparent);
  }

  .visor-toolchain__node--error {
    border-color: var(--color-danger);
  }

  .visor-toolchain__node--running {
    border-color: var(--color-success);
    animation: pulse 1s ease-in-out infinite;
  }

  .visor-toolchain__node-handle {
    width: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    cursor: grab;
    color: var(--color-muted);
  }

  .visor-toolchain__node-handle:hover {
    color: var(--color-text);
  }

  .visor-toolchain__node-content {
    flex: 1;
    padding: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-md);
  }

  .visor-toolchain__node-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    color: var(--color-accent);
  }

  .visor-toolchain__node-icon svg {
    width: 18px;
    height: 18px;
  }

  .visor-toolchain__node-info {
    flex: 1;
  }

  .visor-toolchain__node-name {
    font-size: 0.8rem;
    font-weight: var(--weight-semibold);
    color: var(--color-text);
  }

  .visor-toolchain__node-type {
    font-size: 0.65rem;
    color: var(--color-muted);
    margin-top: 0.2rem;
  }

  .visor-toolchain__node-status {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0 var(--space-md);
    font-size: 0.65rem;
  }

  .visor-toolchain__node-status.pending { color: var(--color-muted); }
  .visor-toolchain__node-status.running { color: var(--color-success); }
  .visor-toolchain__node-status.complete { color: var(--color-success); }
  .visor-toolchain__node-status.error { color: var(--color-danger); }

  .visor-toolchain__node-remove {
    width: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--color-muted);
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-fast);
  }

  .visor-toolchain__node:hover .visor-toolchain__node-remove {
    opacity: 1;
  }

  .visor-toolchain__node-remove:hover {
    color: var(--color-danger);
  }

  /* -- Connections ---------------------------------------------------------- */

  .visor-toolchain__connections {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
  }

  .visor-toolchain__connection {
    stroke: var(--color-border);
    stroke-width: 2;
    fill: none;
  }

  .visor-toolchain__connection.valid {
    stroke: var(--color-success);
  }

  .visor-toolchain__connection.invalid {
    stroke: var(--color-danger);
    stroke-dasharray: 5;
  }

  /* -- Arrow between nodes -------------------------------------------------- */

  .visor-toolchain__arrow {
    display: flex;
    justify-content: center;
    padding: 0.25rem 0;
    color: var(--color-muted);
  }

  .visor-toolchain__arrow svg {
    width: 16px;
    height: 16px;
  }

  /* -- Validation ----------------------------------------------------------- */

  .visor-toolchain__validation {
    padding: var(--space-sm) var(--space-md);
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    font-size: 0.7rem;
  }

  .visor-toolchain__validation-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.25rem 0;
  }

  .visor-toolchain__validation-item.error {
    color: var(--color-danger);
  }

  .visor-toolchain__validation-item.warning {
    color: var(--color-warning);
  }

  .visor-toolchain__validation-item.success {
    color: var(--color-success);
  }

  /* -- Config panel (right column) ------------------------------------------ */

  .visor-toolchain__config {
    width: 280px;
    border-left: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
  }

  .visor-toolchain__config-header {
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
  }

  .visor-toolchain__config-title {
    font-size: 0.75rem;
    font-weight: var(--weight-semibold);
    color: var(--color-text);
  }

  .visor-toolchain__config-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
  }

  .visor-toolchain__config-empty {
    color: var(--color-muted);
    font-size: 0.75rem;
    text-align: center;
    padding: 2rem var(--space-lg);
  }

  /* -- Config form ---------------------------------------------------------- */

  .visor-toolchain__config-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
  }

  .visor-toolchain__config-field {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
  }

  .visor-toolchain__config-label {
    font-size: 0.7rem;
    font-weight: var(--weight-semibold);
    color: var(--color-text);
  }

  .visor-toolchain__config-label .required {
    color: var(--color-danger);
  }

  .visor-toolchain__config-input {
    padding: var(--space-sm);
    font-size: 0.75rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
  }

  .visor-toolchain__config-input:focus {
    outline: none;
    border-color: var(--color-accent);
  }

  .visor-toolchain__config-select {
    padding: var(--space-sm);
    font-size: 0.75rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
  }

  .visor-toolchain__config-hint {
    font-size: 0.65rem;
    color: var(--color-muted);
  }

  /* -- Config types --------------------------------------------------------- */

  .visor-toolchain__config-types {
    display: flex;
    gap: var(--space-lg);
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-md);
  }

  .visor-toolchain__config-type {
    flex: 1;
  }

  .visor-toolchain__config-type-label {
    font-size: 0.6rem;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 0.25rem;
  }

  .visor-toolchain__config-type-value {
    font-size: 0.7rem;
    font-family: var(--font-mono);
    color: var(--color-accent);
    padding: 0.25rem var(--space-sm);
    background: var(--color-surface);
    border-radius: 3px;
  }

  /* -- Results (dry-run) ---------------------------------------------------- */

  .visor-toolchain__results {
    display: none;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-top: 2px solid var(--color-success);
    max-height: 40%;
    flex-direction: column;
  }

  .visor-toolchain__results.visible {
    display: flex;
  }

  .visor-toolchain__results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: color-mix(in srgb, var(--color-success) 10%, var(--color-surface));
    border-bottom: 1px solid var(--color-border);
  }

  .visor-toolchain__results-title {
    font-size: 0.75rem;
    font-weight: var(--weight-semibold);
    color: var(--color-success);
  }

  .visor-toolchain__results-close {
    background: none;
    border: none;
    color: var(--color-muted);
    font-size: 1rem;
    cursor: pointer;
  }

  .visor-toolchain__results-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.7rem;
  }

  .visor-toolchain__result-step {
    padding: var(--space-sm);
    margin-bottom: var(--space-sm);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-muted);
  }

  .visor-toolchain__result-step.success {
    border-left-color: var(--color-success);
  }

  .visor-toolchain__result-step.error {
    border-left-color: var(--color-danger);
  }

  .visor-toolchain__result-step-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.35rem;
  }

  .visor-toolchain__result-step-name {
    font-weight: var(--weight-semibold);
    color: var(--color-text);
  }

  .visor-toolchain__result-step-status {
    font-size: 0.65rem;
  }

  .visor-toolchain__result-step-output {
    color: var(--color-muted);
    white-space: pre-wrap;
  }

  /* -- Responsive ----------------------------------------------------------- */

  @media (max-width: 900px) {
    .visor-toolchain__content {
      flex-direction: column;
    }

    .visor-toolchain__palette {
      width: 100%;
      height: 150px;
      border-right: none;
      border-bottom: 1px solid var(--color-border);
    }

    .visor-toolchain__palette-tools {
      display: flex;
      flex-wrap: wrap;
      gap: 0.35rem;
    }

    .visor-toolchain__tool-item {
      flex: 0 0 auto;
      margin-bottom: 0;
    }

    .visor-toolchain__config {
      width: 100%;
      height: 200px;
      border-left: none;
      border-top: 1px solid var(--color-border);
    }
  }
}