fusion/packages/dashboard/app/components/Lane.css

/* Multi-lane board lane (U9). Each lane is a full-width vertical row whose
 * columns scroll horizontally inside the lane. Tokens mirror .board/.column in
 * app/styles.css; no monolith CSS is touched. */

.board-lanes {
  display: flex;
  flex-direction: column;
  gap: var(--column-gap, 12px);
  flex: 1 1 auto;
  min-height: 0;
  min-width: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--board-padding, 12px);
  box-sizing: border-box;
}

.board-workflow-view {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  width: 100%;
  height: 100%;
  max-height: 100%;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--bg);
}

.board-workflow-toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.board-workflow-selector {
  display: inline-flex;
  margin-left: auto;
  min-width: 0;
}

.board-workflow-create-btn,
.board-workflow-edit-btn {
  flex: 0 0 auto;
}

.board.board-workflow-columns {
  flex: 1 1 auto;
  display: flex;
  flex-direction: row;
  align-items: stretch;
  width: 100%;
  height: 100%;
  max-height: 100%;
  min-height: 0;
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  touch-action: pan-x pan-y;
}

.board.board-workflow-columns > .column {
  flex: 1 0 300px;
  min-width: 300px;
  height: 100%;
  min-height: 0;
  scroll-snap-align: center;
  touch-action: pan-x pan-y;
}

.lane {
  display: flex;
  flex-direction: column;
  flex: 0 0 auto;
  width: 100%;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg, 10px);
  background: var(--surface-muted, var(--surface));
}

.lane-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
}

.lane-header:hover {
  background: var(--surface-hover, var(--surface));
}

.lane-header:focus-visible {
  outline: 2px solid var(--todo);
  outline-offset: -2px;
}

.lane-name {
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0;
}

.lane-count {
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  color: var(--text-muted, var(--text));
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm, 6px);
  padding: 0 6px;
  min-width: 1.5rem;
  text-align: center;
}

.lane-columns {
  display: flex;
  gap: var(--column-gap, 12px);
  padding: 12px;
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  scrollbar-color: var(--border) transparent;
  scrollbar-width: thin;
  min-height: 0;
  touch-action: pan-x pan-y;
}

.lane-columns > .column {
  flex: 0 0 clamp(280px, 28vw, 340px);
  /* Repo convention (mobile-scroll-snap test): snap-align must be `center`. */
  scroll-snap-align: center;
  touch-action: pan-x pan-y;
}

.lane-columns::-webkit-scrollbar {
  height: 6px;
}
.lane-columns::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: var(--radius-sm, 6px);
}

/* Inline column feedback (capacity-exhausted promote, deterministic drag
 * rejection) — rendered in-column, not a toast (R17 / promote spec). */
.column-inline-feedback {
  margin: 4px 12px 0;
  padding: 6px 8px;
  font-size: 0.8rem;
  color: var(--color-error);
  background: color-mix(in srgb, var(--color-error) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-error) 35%, transparent);
  border-radius: var(--radius-sm, 6px);
}


@media (max-width: 1024px) {
  .board.board-lanes {
    flex-direction: column;
    overflow-x: hidden;
    overflow-y: auto;
    scroll-snap-type: none;
  }

  .board.board-lanes > .lane {
    width: 100%;
    min-width: 0;
    flex-shrink: 0;
  }

  .board.board-workflow-columns {
    flex: 1 1 auto;
    flex-direction: row;
    align-items: stretch;
    width: 100%;
    height: 100%;
    max-height: 100%;
    min-height: 0;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x proximity;
  }
}