.sidebar-tab-body {
    position: relative;
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    padding: var(--spacing-sm);
    gap: var(--spacing-md);
}

.sidebar-panel-empty-region {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm);
    pointer-events: none;
}

.sidebar-panel-empty-region .sidebar-panel-empty {
    pointer-events: auto;
}

.sidebar-panel-empty-region.hidden {
    display: none;
}

.sidebar-panel-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-md);
    flex-shrink: 0;
    max-width: 100%;
}

.sidebar-panel-empty__icon {
    margin-bottom: var(--spacing-xs);
}

.sidebar-panel-empty__title {
    margin: 0 0 2px 0;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-light);
    line-height: 1.3;
}

.sidebar-panel-empty__desc {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    line-height: 1.4;
    max-width: 280px;
}

.sidebar-scroll-region {
    position: relative;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

.sidebar-scroll-region > * {
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

.sidebar-scroll-region::before,
.sidebar-scroll-region::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    height: 28px;
    z-index: 2;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.sidebar-scroll-region::before {
    top: 0;
    background: linear-gradient(
        to bottom,
        var(--surface-dark) 0%,
        rgba(19, 19, 19, 0.65) 45%,
        transparent 100%
    );
}

.sidebar-scroll-region::after {
    bottom: 0;
    background: linear-gradient(
        to top,
        var(--surface-dark) 0%,
        rgba(19, 19, 19, 0.65) 45%,
        transparent 100%
    );
}

.sidebar-scroll-region.has-scroll-above::before {
    opacity: 1;
}

.sidebar-scroll-region.has-scroll-below::after {
    opacity: 1;
}

.sidebar-content-reveal {
    opacity: 0;
    transform: translateY(10px);
    transition:
        opacity var(--sidebar-reveal-duration) var(--sidebar-reveal-ease),
        transform var(--sidebar-reveal-duration) var(--sidebar-reveal-ease);
}

.sidebar-content-reveal.is-revealed {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .sidebar-scroll-region::before,
    .sidebar-scroll-region::after {
        transition: none;
    }

    .sidebar-content-reveal,
    .sidebar-content-reveal.is-revealed {
        opacity: 1;
        transform: none;
        transition: none;
    }
}