/* Center Stage — tabbed app area */
.stage {
    flex: 1;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
}

/* Tab bar */
.stage-tabbar {
    height: var(--tab-height);
    min-height: var(--tab-height);
    background: var(--bg-dock);
    border-bottom: 1px solid var(--border-structural);
    display: flex;
    align-items: center;
    padding: 0 8px;
    gap: 4px;
}

.stage-tabs {
    flex: 1;
    display: flex;
    gap: 2px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.stage-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 12px;
    height: 32px;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--transition-fast), color var(--transition-fast);
    min-height: 32px;
}

.stage-tab:hover {
    background: var(--accent-hover);
    color: var(--text-primary);
}

.stage-tab.active {
    background: var(--bg-stage);
    color: var(--text-primary);
}

.stage-tab .tab-close {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 11px;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
}

.stage-tab .tab-close:hover {
    background: var(--status-red);
    color: #fff;
}

/* Layout controls */
.stage-controls {
    display: flex;
    gap: 2px;
    flex-shrink: 0;
}

.layout-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.layout-btn:hover {
    background: var(--accent-hover);
    color: var(--text-primary);
}

.layout-btn.active {
    color: var(--accent);
}

/* Panes */
.stage-panes {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.stage-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
}

.stage-pane + .stage-pane {
    border-left: 1px solid var(--border-structural);
}

/* Titlebar */
.pane-titlebar {
    height: var(--titlebar-height);
    min-height: var(--titlebar-height);
    background: var(--bg-titlebar);
    border-bottom: 1px solid var(--border-structural);
    display: flex;
    align-items: center;
    padding: 0 12px;
    gap: 8px;
}

.pane-dots {
    display: flex;
    gap: 6px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot-red { background: var(--status-red); }
.dot-amber { background: var(--status-amber); }
.dot-green { background: var(--status-green); }

.pane-title {
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Pane content */
.pane-content {
    flex: 1;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    position: relative;
}

/* App container */
.app-view {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}