/* =========================================================================
   MwGanttChart — mw-gc-* prefix
   Architecture: CSS Grid (same technique as MWScheduler horizontal view).
   Column 1 = label, columns 2+ = time slots. Bars placed via grid-column.
   ========================================================================= */

/* NOTE: Root container */
.mw-gc-root {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--mud-palette-lines-default);
    border-radius: var(--mud-default-borderradius);
    overflow: hidden;
    background: var(--mud-palette-surface);
    font-size: 0.8125rem;
    height: 100%;
}

.mw-gc-empty {
    padding: 24px;
    text-align: center;
    color: var(--mud-palette-text-secondary);
}

/* NOTE: Toolbar */
.mw-gc-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-bottom: 1px solid var(--mud-palette-lines-default);
    background: var(--mud-palette-background);
    flex-shrink: 0;
}

.mw-gc-toolbar-group {
    display: flex;
    gap: 2px;
}

/* NOTE: CSS Grid — the core layout */
.mw-gc-grid {
    display: grid;
    grid-template-columns:
        200px
        repeat(var(--gc-slot-count), var(--gc-slot-width, 80px));
    grid-template-rows:
        40px
        repeat(var(--gc-row-count), 36px);
    flex: 1;
    overflow: auto;
    position: relative;
    user-select: none;
    outline: none;
}

/* NOTE: Top-left corner (label column header) */
.mw-gc-corner {
    position: sticky;
    left: 0;
    top: 0;
    z-index: 10;
    background: var(--mud-palette-background);
    display: flex;
    align-items: center;
    padding: 0 12px;
    font-weight: 600;
    border-bottom: 2px solid var(--mud-palette-lines-default);
    border-right: 2px solid var(--mud-palette-lines-default);
}

/* NOTE: Time axis tick cells (row 1) */
.mw-gc-tick {
    position: sticky;
    top: 0;
    z-index: 5;
    background: var(--mud-palette-background);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: var(--mud-palette-text-secondary);
    border-bottom: 2px solid var(--mud-palette-lines-default);
    border-right: 1px solid var(--mud-palette-lines-inputs);
}

/* NOTE: Group header — label column */
.mw-gc-group-label {
    position: sticky;
    left: 0;
    z-index: 6;
    background: var(--mud-palette-background-grey);
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 8px;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 1px solid var(--mud-palette-lines-default);
    border-right: 2px solid var(--mud-palette-lines-default);
}

.mw-gc-group-label:hover {
    background: var(--mud-palette-action-default-hover);
}

/* NOTE: Group header — background spanning all time columns */
.mw-gc-group-bg {
    background: var(--mud-palette-background-grey);
    border-bottom: 1px solid var(--mud-palette-lines-default);
}

/* NOTE: Row labels (sticky left) */
.mw-gc-row-label {
    position: sticky;
    left: 0;
    z-index: 6;
    background: var(--mud-palette-surface);
    display: flex;
    align-items: center;
    padding: 0 12px 0 24px;
    border-bottom: 1px solid var(--mud-palette-lines-inputs);
    border-right: 2px solid var(--mud-palette-lines-default);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--mud-palette-text-secondary);
}

/* NOTE: Background cells (one per time slot per item row) */
.mw-gc-cell {
    border-bottom: 1px solid var(--mud-palette-lines-inputs);
    border-right: 1px solid var(--mud-palette-lines-inputs);
    background: var(--mud-palette-surface);
}

/* NOTE: Task bars — placed via grid-column start/end */
.mw-gc-bar {
    display: flex;
    align-items: center;
    border-radius: 4px;
    background: var(--mud-palette-primary);
    color: var(--mud-palette-primary-text);
    cursor: pointer;
    z-index: 2;
    margin: 4px 2px;
    overflow: hidden;
    box-sizing: border-box;
    transition: box-shadow 0.15s;
}

.mw-gc-bar:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    z-index: 4;
}

.mw-gc-bar:focus-visible {
    outline: 2px solid var(--mud-palette-primary);
    outline-offset: 2px;
    z-index: 4;
}

.mw-gc-bar-content {
    flex: 1;
    padding: 0 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.75rem;
    pointer-events: none;
}

/* NOTE: Status color modifiers */
.mw-gc-bar-pending {
    background: var(--mud-palette-info);
    color: var(--mud-palette-info-text);
}

.mw-gc-bar-in-progress {
    background: var(--mud-palette-warning);
    color: var(--mud-palette-warning-text);
}

.mw-gc-bar-done {
    background: var(--mud-palette-success);
    color: var(--mud-palette-success-text);
}

.mw-gc-bar-blocked {
    background: var(--mud-palette-error);
    color: var(--mud-palette-error-text);
}

/* NOTE: Critical path */
.mw-gc-bar-critical {
    outline: 2px solid var(--mud-palette-error);
    outline-offset: -1px;
}

/* NOTE: Resize handles */
.mw-gc-resize-handle {
    position: absolute;
    top: 0;
    width: 8px;
    height: 100%;
    cursor: col-resize;
    z-index: 5;
}

.mw-gc-resize-start {
    left: 0;
}

.mw-gc-resize-end {
    right: 0;
}

.mw-gc-resize-handle:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* NOTE: Today line — spans full grid height at the today column */
.mw-gc-today-line {
    background: var(--mud-palette-primary);
    opacity: 0.3;
    pointer-events: none;
    z-index: 1;
}

/* NOTE: SVG arrow overlay */
.mw-gc-arrow-overlay {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 3;
    overflow: visible;
}

.mw-gc-arrow {
    stroke: var(--mud-palette-text-secondary);
    stroke-width: 1.5;
    fill: none;
}

.mw-gc-arrow-critical {
    stroke: var(--mud-palette-error);
    stroke-width: 2.5;
}

.mw-gc-arrowhead-fill {
    fill: var(--mud-palette-text-secondary);
}

.mw-gc-arrowhead-critical-fill {
    fill: var(--mud-palette-error);
}