/* ==========================================
   Chat Switchboard — Pane Container
   ==========================================
   v0.25.0: Styles for the multi-pane layout system.
   Covers: pane container, leaf panes, tabbed panes,
   drag handles, and tab bars.
   ========================================== */

/* ── Container ─────────────────────────────── */

.pane-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

/* ── Split ─────────────────────────────────── */

.pane-split--horizontal {
    display: flex;
    flex-direction: row;
    height: 100%;
    overflow: hidden;
}

.pane-split--vertical {
    display: flex;
    flex-direction: column;
    width: 100%;
    overflow: hidden;
}

/* ── Leaf Pane ─────────────────────────────── */

.pane-leaf {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    box-sizing: border-box;
}

.pane-minimized {
    max-width: 0 !important;
    max-height: 0 !important;
    padding: 0 !important;
    border: none !important;
    overflow: hidden !important;
}

/* ── Tabbed Pane ───────────────────────────── */

.pane-tabbed {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-sizing: border-box;
}

/* Tab Bar */
.pane-tab-bar {
    display: flex;
    align-items: center;
    gap: 0;
    background: var(--bg-secondary, #1a1a1e);
    border-bottom: 1px solid var(--border, #2a2a2e);
    flex-shrink: 0;
    height: 32px;
    padding: 0 4px;
    overflow-x: auto;
    overflow-y: hidden;
}

.pane-tab-bar::-webkit-scrollbar { height: 0; }

.pane-tab-btn {
    background: none;
    border: none;
    color: var(--text-3, #777);
    font-size: 11px;
    font-weight: 600;
    font-family: inherit;
    padding: 6px 12px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.pane-tab-btn:hover {
    color: var(--text, #eee);
}

.pane-tab-btn--active {
    color: var(--accent, #b38a4e);
    border-bottom-color: var(--accent, #b38a4e);
}

/* Tab Content */
.pane-tab-content {
    flex: 1;
    min-height: 0;
    min-width: 0;
    overflow: hidden;
    position: relative;
}

.pane-tab-panel {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

/* When panel is hidden (inactive tab), override absolute positioning */
.pane-tab-panel[style*="display: none"] {
    position: absolute;
}

/* ── Drag Handle ───────────────────────────── */

.pane-handle {
    flex-shrink: 0;
    background: var(--border, #2a2a2e);
    transition: background 0.15s;
    z-index: 10;
}

.pane-handle--horizontal {
    width: 4px;
    cursor: col-resize;
}

.pane-handle--vertical {
    height: 4px;
    cursor: row-resize;
}

.pane-handle:hover,
.pane-handle--active {
    background: var(--accent, #b38a4e);
}

/* ── Responsive ────────────────────────────── */

@media (max-width: 768px) {
    /* On mobile, splits collapse to vertical stack */
    .pane-split--horizontal {
        flex-direction: column;
    }

    .pane-handle--horizontal {
        width: 100%;
        height: 4px;
        cursor: row-resize;
    }

    /* Hide non-primary panes on mobile */
    .pane-split--horizontal > .pane:not(:first-child) {
        display: none;
    }
    .pane-split--horizontal > .pane-handle {
        display: none;
    }
}