/* Hide individual CTO/client nodes when using aggregated PON view */
.tree-aggregated .tree-node-box,
.tree-aggregated .tree-node-client {
    display: none !important;
}

/* Aggregated CTO list under PON cards */
.pon-agg-card {
    background: rgba(148, 163, 184, 0.06);
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-radius: var(--radius-lg);
    padding: var(--pon-agg-card-padding);
    margin: var(--pon-agg-card-margin);
    box-shadow: var(--shadow-xs);
    width: var(--pon-agg-card-width);
    min-width: var(--pon-agg-card-min-width);
    max-width: var(--pon-agg-card-max-width);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: var(--pon-agg-card-gap);
    align-items: stretch;
    align-self: flex-start;
}

.pon-agg-label {
    font-size: var(--pon-agg-label-font-size);
    letter-spacing: 0.01em;
    color: var(--gray-800);
    text-align: center;
    opacity: var(--pon-agg-label-opacity);
    margin: 0;
    font-weight: var(--pon-agg-label-font-weight);
}

.pon-agg-card:hover {
    background: rgba(148, 163, 184, 0.1);
    border-color: rgba(148, 163, 184, 0.32);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.tree-node.is-selected .pon-agg-card,
.pon-agg-card.is-selected,
.pon-agg-card.selected {
    outline: none;
    box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.85), 0 8px 18px rgba(29, 78, 216, 0.14);
    border-color: rgba(148, 163, 184, 0.32);
    background: rgba(148, 163, 184, 0.06);
}

html[data-theme="dark"] .tree-node.is-selected .pon-agg-card,
html[data-theme="dark"] .pon-agg-card.is-selected,
html[data-theme="dark"] .pon-agg-card.selected {
    box-shadow: 0 0 0 3px rgba(191, 219, 254, 0.9), 0 8px 18px rgba(0, 0, 0, 0.45);
}

.pon-agg-card.empty {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-600);
    font-size: 0.85rem;
    cursor: default;
}

.pon-agg-card:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.pon-agg-empty {
    font-size: 0.85rem;
    color: var(--gray-600);
    text-align: center;
    padding: 8px;
}

.chip-list {
    display: grid;
    grid-template-columns: var(--chip-list-columns);
    gap: var(--chip-list-gap);
    margin: var(--chip-list-margin);
    width: 100%;
}

.chip-list.chip-list--single {
    grid-template-columns: var(--chip-list-single-columns);
    justify-items: stretch;
}

.chip-list.chip-list--single .chip {
    grid-column: 2;
    justify-self: stretch;
}

@media (min-width: 1025px) {
    :root {
        --chip-list-columns: repeat(3, minmax(0, 1fr));
        --chip-list-gap: 8px;
        --chip-padding: 5px 9px;
        --chip-min-height: 24px;
        --chip-font-size: 0.7rem;
    }
}

@media (max-width: 1024px) {
    :root {
        --pon-agg-card-padding: 10px 12px;
        --pon-agg-card-min-width: 220px;
        --pon-agg-card-max-width: 100%;
        --chip-list-columns: repeat(3, minmax(0, 1fr));
        --chip-list-gap: 5px;
        --chip-padding: 4px 7px;
        --chip-min-height: 21px;
        --chip-font-size: 0.64rem;
    }
    .chip-list {
        margin-left: 0;
    }
    .pon-agg-footer {
        margin-left: 0;
    }
}

@media (max-width: 640px) {
    :root {
        --pon-agg-card-padding: 8px 10px;
        --pon-agg-card-min-width: 200px;
        --pon-agg-card-max-width: 260px;
        --chip-list-columns: repeat(3, minmax(0, 1fr));
        --chip-list-gap: 4px;
        --chip-padding: 3px 6px;
        --chip-min-height: 20px;
        --chip-font-size: 0.6rem;
        --chip-gap: 2px;
    }
    .chip-list {
        margin-left: 0;
    }
    .pon-agg-footer {
        margin-left: 0;
    }
}

/* PON aggregated summary row */
.pon-agg-summary {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}
.pon-agg-summary .sum-item { font-size: 0.85rem; color: var(--gray-700); }
.pon-agg-summary .sum-sep { color: var(--gray-400); }
.pon-agg-summary .sum-spacer { flex: 1; }

/* PON aggregated header row */
.pon-agg-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 2px var(--spacing-sm) 4px;
    border-bottom: 1px solid var(--gray-200);
    position: relative;
    margin-bottom: 18px;
}
.pon-agg-header .header-item {
    font-size: 0.875rem;
    color: var(--gray-800);
    font-weight: 600;
    letter-spacing: 0.025em;
    text-align: center;
    flex: 1;
}

/* PON aggregated footer row */
.pon-agg-footer {
    text-align: center;
    font-size: var(--pon-agg-footer-font-size);
    color: var(--gray-700);
    font-weight: 500;
    padding-top: 4px;
    align-self: center;
    width: 100%;
}
.pon-agg-footer .footer-item {
    font-size: 0.7rem;
    color: var(--gray-600);
    font-weight: 400;
}
.btn-ghost { background: var(--white); border: 1px dashed var(--gray-300); color: var(--gray-700); }
.btn-ghost:hover { background: var(--gray-50); border-color: var(--gray-400); }

/* Focus Overlay removed; using right side details panel */

/* Aggregated CTO list under a PON */
.cto-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.cto-item {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px dashed var(--gray-200);
}
.cto-item:last-child { border-bottom: none; }

.cto-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}
.cto-meta {
    flex: 1;
    color: var(--gray-500);
    font-size: 0.8rem;
    padding-left: var(--spacing-md);
}
.cto-toggle {
    border: 1px solid var(--gray-300);
    background: var(--white);
    color: var(--gray-700);
    border-radius: var(--radius-sm);
    padding: 4px 10px;
    font-size: 0.8rem;
    cursor: pointer;
}
.cto-toggle:hover { background: var(--gray-50); }

.client-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.tree-node.search-match .tree-node-content {
    background: rgba(255, 243, 205, 0.5);
}


/* States */
.loading-state,
.error-state,
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: var(--spacing-2xl);
}

.error-icon,
.empty-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
}

.error-state h3,
.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.error-state p,
.empty-state p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

/* Modern Topology Tree */
.topology-tree {
    padding: var(--spacing-lg);
    background: var(--sidebar-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: auto;
    overscroll-behavior: contain;
    /* Subtle fade effect at edges - keeps rounded corners visually consistent */
    mask-image: linear-gradient(
        to bottom,
        rgba(0,0,0,0.6) 0,
        black 16px,
        black calc(100% - 16px),
        rgba(0,0,0,0.6) 100%
    );
    -webkit-mask-image: linear-gradient(
        to bottom,
        rgba(0,0,0,0.6) 0,
        black 16px,
        black calc(100% - 16px),
        rgba(0,0,0,0.6) 100%
    );
}

/* Modern Tree Node Styles */
.tree-node {
    margin-bottom: var(--tree-node-margin-bottom);
    border-radius: var(--radius-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal), border-color var(--transition-normal), opacity var(--transition-normal);
    position: relative;
    overflow: visible;
}

/* OLT, SLOT, PON nodes - block display for vertical stacking */
.tree-node-olt,
.tree-node-slot,
.tree-node-pon {
    display: block;
}

.tree-node::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--tree-accent-width);
    background: linear-gradient(180deg, rgba(148, 163, 184, 0.28) 0%, rgba(148, 163, 184, 0.12) 100%);
    border-radius: var(--radius-pill);
    opacity: 0.8;
    transition: all var(--transition-fast);
}

.tree-node-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--tree-node-content-padding);
    cursor: pointer;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    border-left-width: var(--tree-accent-width);
    border-left-color: rgba(148, 163, 184, 0.3);
    transition: all var(--transition-normal);
    position: relative;
    background: var(--white);
    margin-left: var(--tree-node-content-margin-left);
    min-height: var(--tree-node-content-min-height);
    backdrop-filter: blur(10px);
    z-index: 1;
}

.tree-node-content::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(148, 163, 184, 0.08) 100%);
    pointer-events: none;
    transition: opacity var(--transition-fast);
    opacity: 0;
}

.tree-node-content:hover::after {
    opacity: 1;
}

/* Compact tree density */
.tree-compact .tree-node { margin: 2px 0; }
.tree-compact .tree-node-content {
    display: inline-flex; /* shrink to content width */
    padding: 4px 6px;
    gap: var(--spacing-sm);
    min-height: 28px;
}
.tree-compact .tree-node-info { gap: 2px; }
.tree-compact .tree-node-name { font-size: 13px; line-height: 16px; }
.tree-compact .tree-node-details { font-size: 11px; opacity: 0.85; }
.tree-compact .tree-node-actions .tree-node-action { padding: 2px 4px; }
.tree-compact .tree-node-toggle { width: 18px; height: 18px; }
.tree-compact .toggle-icon { font-size: 10px; }

/* Fixed width for hierarchy nodes (OLT, SLOT, PON) - perfect symmetry */
.tree-compact .tree-node-olt > .tree-node-content,
.tree-compact .tree-node-slot > .tree-node-content,
.tree-compact .tree-node-pon > .tree-node-content {
    min-width: 132px;
    max-width: 144px;
    width: 144px;
    padding: 4px 6px;
    gap: 3px;
    min-height: auto;
}

.tree-compact .tree-node-olt > .tree-node-content .tree-node-toggle,
.tree-compact .tree-node-slot > .tree-node-content .tree-node-toggle,
.tree-compact .tree-node-pon > .tree-node-content .tree-node-toggle {
    width: 14px;
    height: 14px;
    padding: 0;
    margin-right: 0;
    flex-shrink: 0;
}

.tree-compact .tree-node-olt > .tree-node-content .tree-node-info,
.tree-compact .tree-node-slot > .tree-node-content .tree-node-info,
.tree-compact .tree-node-pon > .tree-node-content .tree-node-info {
    gap: 0px;
    line-height: 1.2;
}

.tree-compact .tree-node-olt > .tree-node-content .tree-node-name,
.tree-compact .tree-node-slot > .tree-node-content .tree-node-name,
.tree-compact .tree-node-pon > .tree-node-content .tree-node-name {
    font-size: 0.75rem;
    line-height: 1.2;
}

.tree-compact .tree-node-olt > .tree-node-content .tree-node-details,
.tree-compact .tree-node-slot > .tree-node-content .tree-node-details,
.tree-compact .tree-node-pon > .tree-node-content .tree-node-details {
    font-size: 0.65rem;
    line-height: 1.2;
}

.tree-compact .tree-node-name,
.tree-ultra .tree-node-name {
    display: -webkit-box;
    white-space: normal;
    text-overflow: ellipsis;
    overflow: hidden;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    word-break: break-word;
}

.tree-node-content:hover {
    background: var(--gray-50);
    box-shadow: var(--shadow-sm);
    transform: none;
}

.tree-node.is-selected > .tree-node-content {
    outline: none;
    box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.85), 0 10px 24px rgba(15, 23, 42, 0.08);
    transform: none;
}

html[data-theme="dark"] .tree-node.is-selected > .tree-node-content {
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.9), 0 10px 24px rgba(0, 0, 0, 0.5);
}

.tree-node-content:focus {
    outline: none;
}

.tree-node-content:focus-visible {
    outline: 2px solid rgba(59, 130, 246, 0.55);
    outline-offset: 2px;
}

/* Node Toggle */
.tree-node-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    margin-right: var(--tree-node-toggle-margin-right);
    border-radius: var(--radius-sm);
    color: var(--gray-600);
    transition: var(--transition-fast);
    width: var(--tree-node-toggle-size);
    height: var(--tree-node-toggle-size);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
}

.tree-node-toggle:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

.tree-node-spacer {
    width: var(--tree-node-toggle-size);
    height: var(--tree-node-toggle-size);
    margin-right: var(--tree-node-toggle-margin-right);
}

.toggle-icon {
    font-size: 0.75rem;
    transition: var(--transition-fast);
}

/* Node Icon */
.status-badge.status-warning {
    background: #fffaf0;
    color: var(--warning-color);
}

/* Node Info */
.tree-node-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 2px;
}

.tree-node-name {
    font-weight: 600;
    color: var(--gray-900);
    font-size: var(--tree-node-name-font-size);
    line-height: 1.3;
    margin: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: normal;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    word-break: break-word;
}

.tree-node-details {
    font-size: var(--tree-node-details-font-size);
    color: var(--gray-600);
    line-height: 1.2;
    margin: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.tree-node-details strong {
    font-weight: 600;
    color: var(--gray-700);
}

/* Node Actions */
.tree-node-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: var(--transition-fast);
}

.tree-node-content:hover .tree-node-actions {
    opacity: 1;
}

.tree-node-action {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    color: transparent;
    transition: var(--transition-fast);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    opacity: 0;
}

.tree-node-action:hover {
    background: none;
    color: transparent;
}

/* Node Children */
.tree-node-children {
    margin-left: var(--tree-indent-width);
    padding-left: 0;
    overflow: hidden;
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.tree-node-olt > .tree-node-children {
    margin-left: calc(var(--tree-indent-width) * 1.15);
}

.tree-node-slot > .tree-node-children {
    margin-left: calc(var(--tree-indent-width) * 1.45);
}

.tree-node-pon > .tree-node-children {
    margin-left: calc(var(--tree-indent-width) * 1.75);
}

.tree-node-box > .tree-node-children {
    margin-left: calc(var(--tree-indent-width) * 2.05);
}

.tree-node-children.collapsed {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    margin-bottom: 0;
}

/* Reduce vertical spacing for collapsed tree nodes */
.tree-node.collapsed {
    margin-bottom: 2px;
}

/* Ensure collapsed nodes take minimal space */
.tree-node:not(.expanded) .tree-node-children {
    height: 0;
    overflow: hidden;
    margin: 0;
    padding: 0;
}

.tree-node-children.expanded {
    max-height: none;
    opacity: 1;
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

/* Modern Node Type Specific Styles */
.tree-node-olt > .tree-node-content {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.16) 0%, rgba(124, 58, 237, 0.08) 100%);
    color: var(--gray-900);
    font-weight: 600;
    border-color: rgba(37, 99, 235, 0.15);
    --olt-accent-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--olt-accent-color);
    border-left-width: var(--tree-accent-width);
    position: relative;
    overflow: hidden;
}

.tree-node-olt > .tree-node-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 100%);
    pointer-events: none;
}

.tree-node-olt > .tree-node-content:hover {
    background: linear-gradient(135deg, rgba(29, 78, 216, 0.2) 0%, rgba(109, 40, 217, 0.14) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(37, 99, 235, 0.2);
}

.tree-node-olt > .tree-node-content .tree-node-name {
    color: var(--gray-900);
}

.tree-node-olt > .tree-node-content .tree-node-details {
    color: var(--gray-600);
}

.tree-node-olt > .tree-node-content .tree-node-toggle {
    color: var(--gray-500);
}

.tree-node-olt > .tree-node-content .tree-node-toggle:hover {
    background: rgba(37, 99, 235, 0.12);
    color: var(--primary-color);
}

.tree-node-olt > .tree-node-content .tree-node-action {
    color: var(--gray-500);
}

.tree-node-olt > .tree-node-content .tree-node-action:hover {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
}

/* Base background for nodes; overridden by status classes */
.tree-node-olt > .tree-node-content,
.tree-node-slot > .tree-node-content,
.tree-node-pon > .tree-node-content {
    min-height: var(--tree-node-container-min-height);
    padding: var(--tree-node-container-padding);
}

.tree-node-slot .tree-node-content,
.tree-node-pon .tree-node-content,
.tree-node-box .tree-node-content {
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.9) 0%, rgba(241, 245, 249, 0.7) 100%);
    border-left-color: var(--gray-300);
    border-left-width: var(--tree-accent-width);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-fast);
}

.tree-node-box .tree-node-content {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.96) 0%, rgba(248, 250, 252, 0.82) 100%);
    border-color: rgba(148, 163, 184, 0.25);
    border-left-color: rgba(148, 163, 184, 0.45);
    box-shadow: var(--shadow-lg);
}

.tree-node-slot .tree-node-content:hover,
.tree-node-pon .tree-node-content:hover,
.tree-node-box .tree-node-content:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.tree-node-client .tree-node-content {
    background: var(--white);
    border-left-width: var(--tree-accent-width);
    border-left-color: var(--success-color);
    font-size: 0.875rem;
}

.tree-node-client.status-offline .tree-node-content {
    border-left-color: var(--error-color);
}

/* Status-driven borders for container nodes */
/* Full-row color coding by status (all node types) */
.tree-node-content.status-online {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.2) 0%, rgba(22, 163, 74, 0.1) 100%);
    border-left-color: var(--success-color);
}
.tree-node-content.status-warning {
    background: linear-gradient(135deg, rgba(250, 204, 21, 0.2) 0%, rgba(253, 230, 138, 0.12) 100%);
    border-left-color: var(--warning-color);
}
.tree-node-content.status-neutral {
    background: linear-gradient(135deg, rgba(148, 163, 184, 0.22) 0%, rgba(226, 232, 240, 0.12) 100%);
    border-left-color: rgba(148, 163, 184, 0.6);
}
.tree-node-content.status-offline {
    background: linear-gradient(135deg, rgba(248, 113, 113, 0.24) 0%, rgba(239, 68, 68, 0.14) 100%);
    border-left-color: var(--error-color);
}

/* Dark theme - amplify status coloration for clarity */
html[data-theme="dark"] .tree-node-content {
    color: #f2f2f7;
}

html[data-theme="dark"] .tree-node-content .tree-node-name {
    color: #ffffff;
}

html[data-theme="dark"] .tree-node-content .tree-node-details,
html[data-theme="dark"] .tree-node-content .tree-node-meta {
    color: var(--dark-subtitle-color);
}

html[data-theme="dark"] .tree-node-content.status-online {
    background: linear-gradient(135deg, rgba(48, 209, 88, 0.55) 0%, rgba(48, 209, 88, 0.2) 100%);
    border-left-color: rgba(48, 209, 88, 0.95);
    box-shadow: 0 0 0 1px rgba(48, 209, 88, 0.3), 0 16px 32px rgba(48, 209, 88, 0.25);
}

html[data-theme="dark"] .tree-node-content.status-offline {
    background: linear-gradient(135deg, rgba(255, 69, 58, 0.55) 0%, rgba(255, 69, 58, 0.18) 100%);
    border-left-color: rgba(255, 69, 58, 0.95);
    box-shadow: 0 0 0 1px rgba(255, 69, 58, 0.3), 0 16px 32px rgba(255, 69, 58, 0.28);
}

html[data-theme="dark"] .tree-node-content.status-warning {
    background: linear-gradient(135deg, rgba(255, 214, 10, 0.58) 0%, rgba(255, 214, 10, 0.2) 100%);
    border-left-color: rgba(255, 214, 10, 0.95);
    color: #1a1500;
    box-shadow: 0 0 0 1px rgba(255, 214, 10, 0.3), 0 16px 32px rgba(255, 214, 10, 0.28);
}

html[data-theme="dark"] .tree-node-content.status-warning .tree-node-details,
html[data-theme="dark"] .tree-node-content.status-warning .tree-node-meta {
    color: rgba(26, 21, 0, 0.7);
}

html[data-theme="dark"] .tree-node-content.status-neutral {
    background: linear-gradient(135deg, rgba(142, 142, 147, 0.45) 0%, rgba(142, 142, 147, 0.18) 100%);
    border-left-color: rgba(142, 142, 147, 0.85);
    box-shadow: 0 0 0 1px rgba(142, 142, 147, 0.28), 0 16px 32px rgba(142, 142, 147, 0.25);
}

html[data-theme="dark"] .tree-node-content.disconnect-link-loss {
    background: linear-gradient(135deg, rgba(255, 105, 97, 0.58) 0%, rgba(255, 105, 97, 0.22) 100%);
    border-left-color: rgba(255, 105, 97, 0.95);
    box-shadow: 0 0 0 1px rgba(255, 105, 97, 0.3), 0 16px 32px rgba(255, 105, 97, 0.28);
}

html[data-theme="dark"] .tree-node-content.disconnect-dying-gasp {
    background: linear-gradient(135deg, rgba(100, 210, 255, 0.45) 0%, rgba(100, 210, 255, 0.18) 100%);
    border-left-color: rgba(100, 210, 255, 0.9);
    box-shadow: 0 0 0 1px rgba(100, 210, 255, 0.28), 0 16px 32px rgba(100, 210, 255, 0.26);
}

html[data-theme="dark"] .tree-node-content.disconnect-unknown {
    background: linear-gradient(135deg, rgba(167, 139, 250, 0.5) 0%, rgba(167, 139, 250, 0.2) 100%);
    border-left-color: rgba(167, 139, 250, 0.9);
    box-shadow: 0 0 0 1px rgba(167, 139, 250, 0.26), 0 16px 32px rgba(167, 139, 250, 0.24);
}

html[data-theme="dark"] .tree-node-olt > .tree-node-content {
    color: #ffffff;
}

html[data-theme="dark"] .tree-node-olt > .tree-node-content .tree-node-details,
html[data-theme="dark"] .tree-node-olt > .tree-node-content .tree-node-meta {
    color: var(--dark-subtitle-color);
}

html[data-theme="dark"] .tree-node-olt > .tree-node-content .tree-node-toggle {
    color: rgba(255, 255, 255, 0.8);
}

html[data-theme="dark"] .tree-node-olt > .tree-node-content.status-online {
    background: linear-gradient(135deg, rgba(48, 209, 88, 0.55) 0%, rgba(48, 209, 88, 0.2) 100%);
    --olt-accent-color: rgba(48, 209, 88, 0.95);
    color: #ffffff;
    box-shadow: var(--shadow-lg);
}

html[data-theme="dark"] .tree-node-olt > .tree-node-content.status-warning {
    background: linear-gradient(135deg, rgba(255, 214, 10, 0.58) 0%, rgba(255, 214, 10, 0.2) 100%);
    --olt-accent-color: rgba(255, 214, 10, 0.95);
    color: #1a1500;
    box-shadow: var(--shadow-lg);
}

html[data-theme="dark"] .tree-node-olt > .tree-node-content.status-neutral {
    background: linear-gradient(135deg, rgba(142, 142, 147, 0.45) 0%, rgba(142, 142, 147, 0.18) 100%);
    --olt-accent-color: rgba(142, 142, 147, 0.85);
    color: var(--gray-900);
    box-shadow: var(--shadow-lg);
}

html[data-theme="dark"] .tree-node-olt > .tree-node-content.status-offline {
    background: linear-gradient(135deg, rgba(255, 69, 58, 0.55) 0%, rgba(255, 69, 58, 0.18) 100%);
    --olt-accent-color: rgba(255, 69, 58, 0.95);
    color: #ffffff;
    box-shadow: var(--shadow-lg);
}

html[data-theme="dark"] .tree-node-olt > .tree-node-content.disconnect-link-loss {
    background: linear-gradient(135deg, rgba(255, 105, 97, 0.58) 0%, rgba(255, 105, 97, 0.22) 100%);
    --olt-accent-color: rgba(255, 105, 97, 0.95);
    box-shadow: var(--shadow-lg);
}

html[data-theme="dark"] .tree-node-olt > .tree-node-content.disconnect-dying-gasp {
    background: linear-gradient(135deg, rgba(100, 210, 255, 0.45) 0%, rgba(100, 210, 255, 0.18) 100%);
    --olt-accent-color: rgba(100, 210, 255, 0.9);
    box-shadow: var(--shadow-lg);
}

html[data-theme="dark"] .tree-node-olt > .tree-node-content.disconnect-unknown {
    background: linear-gradient(135deg, rgba(167, 139, 250, 0.5) 0%, rgba(167, 139, 250, 0.2) 100%);
    --olt-accent-color: rgba(167, 139, 250, 0.9);
    box-shadow: var(--shadow-lg);
}

/* UNM Disconnect Reason styling - enhanced visual treatment */
.tree-node-content.disconnect-link-loss {
    background: rgba(239, 68, 68, 0.22);   /* More vivid red background */
    border-left-color: var(--link-loss-color);
}
.tree-node-content.disconnect-dying-gasp {
    background: rgba(59, 130, 246, 0.18);  /* Blue background for energy issues */
    border-left-color: var(--dying-gasp-color);
}
.tree-node-content.disconnect-unknown {
    background: rgba(139, 92, 246, 0.20);  /* Purple background for unknown reasons */
    border-left-color: var(--unknown-reason-color);
}

/* Ensure OLT rows also use status background (override gradient) */
.tree-node-olt > .tree-node-content.status-online,
.tree-node-olt > .tree-node-content.status-warning,
.tree-node-olt > .tree-node-content.status-neutral,
.tree-node-olt > .tree-node-content.status-offline,
.tree-node-olt > .tree-node-content.disconnect-link-loss,
.tree-node-olt > .tree-node-content.disconnect-dying-gasp,
.tree-node-olt > .tree-node-content.disconnect-unknown {
    color: var(--gray-900);
}

.tree-node-olt > .tree-node-content.status-online {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.2) 0%, rgba(22, 163, 74, 0.1) 100%);
    --olt-accent-color: var(--success-color);
}

.tree-node-olt > .tree-node-content.status-warning {
    background: linear-gradient(135deg, rgba(250, 204, 21, 0.2) 0%, rgba(253, 230, 138, 0.12) 100%);
    --olt-accent-color: var(--warning-color);
}

.tree-node-olt > .tree-node-content.status-neutral {
    background: linear-gradient(135deg, rgba(148, 163, 184, 0.22) 0%, rgba(226, 232, 240, 0.12) 100%);
    --olt-accent-color: rgba(148, 163, 184, 0.6);
}

.tree-node-olt > .tree-node-content.status-offline {
    background: linear-gradient(135deg, rgba(248, 113, 113, 0.24) 0%, rgba(239, 68, 68, 0.14) 100%);
    --olt-accent-color: var(--error-color);
}

.tree-node-olt > .tree-node-content.disconnect-link-loss {
    background: rgba(239, 68, 68, 0.22);
    --olt-accent-color: var(--link-loss-color);
}

.tree-node-olt > .tree-node-content.disconnect-dying-gasp {
    background: rgba(59, 130, 246, 0.18);
    --olt-accent-color: var(--dying-gasp-color);
}

.tree-node-olt > .tree-node-content.disconnect-unknown {
    background: rgba(139, 92, 246, 0.2);
    --olt-accent-color: var(--unknown-reason-color);
}

.tree-node-olt > .tree-node-content.status-online:hover {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.26) 0%, rgba(22, 163, 74, 0.16) 100%);
    border-color: rgba(37, 99, 235, 0.15);
    border-left-color: var(--olt-accent-color);
}

.tree-node-olt > .tree-node-content.status-warning:hover {
    background: linear-gradient(135deg, rgba(250, 204, 21, 0.26) 0%, rgba(253, 230, 138, 0.16) 100%);
    border-color: rgba(37, 99, 235, 0.15);
    border-left-color: var(--olt-accent-color);
}

.tree-node-olt > .tree-node-content.status-neutral:hover {
    background: linear-gradient(135deg, rgba(148, 163, 184, 0.26) 0%, rgba(226, 232, 240, 0.16) 100%);
    border-color: rgba(37, 99, 235, 0.15);
    border-left-color: var(--olt-accent-color);
}

.tree-node-olt > .tree-node-content.status-offline:hover,
.tree-node-olt > .tree-node-content.disconnect-link-loss:hover {
    background: linear-gradient(135deg, rgba(248, 113, 113, 0.3) 0%, rgba(239, 68, 68, 0.18) 100%);
    border-color: rgba(37, 99, 235, 0.15);
    border-left-color: var(--olt-accent-color);
}

.tree-node-olt > .tree-node-content.disconnect-dying-gasp:hover {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.26) 0%, rgba(96, 165, 250, 0.14) 100%);
    border-color: rgba(37, 99, 235, 0.15);
    border-left-color: var(--olt-accent-color);
}

.tree-node-olt > .tree-node-content.disconnect-unknown:hover {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.28) 0%, rgba(167, 139, 250, 0.16) 100%);
    border-color: rgba(37, 99, 235, 0.15);
    border-left-color: var(--olt-accent-color);
}

/* Loading States in Tree */
.tree-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    color: var(--gray-500);
}

/* Refresh overlay during live updates */
.topology-tree.refreshing {
    position: relative;
}

.topology-tree.refreshing::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(1.5px);
    opacity: 1;
    transition: opacity 0.2s ease;
    pointer-events: none;
    border-radius: var(--radius-md);
    z-index: 50;
}

/* Dark theme refresh overlay */
html[data-theme="dark"] .topology-tree.refreshing::after {
    background: rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(1.5px);
}

/* Mobile Tree Styles */
@media (max-width: 768px) {
    .tree-node-children {
        margin-left: 16px;
        padding-left: 8px;
    }

    .tree-node-content {
        padding: var(--spacing-sm);
    }

    .tree-node-name {
        font-size: 0.8rem;
    }

    .tree-node-details {
        font-size: 0.7rem;
    }

    .node-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .property {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
}

/* Tree Node Highlighting */
.tree-node.highlighted {
    background: rgba(59, 130, 246, 0.16);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-md);
    animation: highlight-pulse 2s ease-in-out;
}

@keyframes highlight-pulse {
    0%, 100% { 
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.45);
    }
    50% { 
        box-shadow: 0 0 0 10px rgba(59, 130, 246, 0);
    }
}

/* Topology Placeholder */
.topology-placeholder {
    text-align: center;
    padding: var(--spacing-2xl);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.topology-placeholder h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.topology-placeholder p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
}

.topology-placeholder details {
    margin-top: var(--spacing-lg);
    text-align: left;
}

.topology-placeholder summary {
    cursor: pointer;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.topology-placeholder pre {
    background: var(--gray-50);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    overflow-x: auto;
    max-height: 300px;
    overflow-y: auto;
}

/* Active state for toggle buttons */
.btn.active {
    background-color: #2b6cb0;
    color: #fff;
    border-color: #2b6cb0;
}

/* Ultra-compact density for very large views */
.tree-ultra .tree-node { margin: 1px 0; }
.tree-ultra .tree-node-content { padding: 2px 4px; min-height: 22px; }
.tree-ultra .tree-node-children { margin-left: 10px; padding-left: 8px; }
.tree-ultra .tree-node-name { font-size: 12px; }
.tree-ultra .tree-node-details { font-size: 10px; }
.tree-ultra .tree-node-toggle { width: 16px; height: 16px; }
.tree-ultra .toggle-icon { font-size: 9px; }

/* Ensure OLT text becomes dark when status background is applied */
.tree-node-olt > .tree-node-content.status-online .tree-node-name,
.tree-node-olt > .tree-node-content.status-warning .tree-node-name,
.tree-node-olt > .tree-node-content.status-neutral .tree-node-name,
.tree-node-olt > .tree-node-content.status-offline .tree-node-name,
.tree-node-olt > .tree-node-content.disconnect-link-loss .tree-node-name,
.tree-node-olt > .tree-node-content.disconnect-dying-gasp .tree-node-name,
.tree-node-olt > .tree-node-content.disconnect-unknown .tree-node-name { color: var(--gray-900); }
.tree-node-olt > .tree-node-content.status-online .tree-node-details,
.tree-node-olt > .tree-node-content.status-warning .tree-node-details,
.tree-node-olt > .tree-node-content.status-neutral .tree-node-details,
.tree-node-olt > .tree-node-content.status-offline .tree-node-details,
.tree-node-olt > .tree-node-content.disconnect-link-loss .tree-node-details,
.tree-node-olt > .tree-node-content.disconnect-dying-gasp .tree-node-details,
.tree-node-olt > .tree-node-content.disconnect-unknown .tree-node-details { color: var(--gray-700); }
.tree-node-olt > .tree-node-content.status-online .tree-node-toggle,
.tree-node-olt > .tree-node-content.status-warning .tree-node-toggle,
.tree-node-olt > .tree-node-content.status-neutral .tree-node-toggle,
.tree-node-olt > .tree-node-content.status-offline .tree-node-toggle,
.tree-node-olt > .tree-node-content.disconnect-link-loss .tree-node-toggle,
.tree-node-olt > .tree-node-content.disconnect-dying-gasp .tree-node-toggle,
.tree-node-olt > .tree-node-content.disconnect-unknown .tree-node-toggle { color: var(--gray-700); }

/* Multi-column layout for OLTs */
.topology-tree.tree-multicol {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: flex-start;
}
.topology-tree.tree-multicol > .tree-node-olt {
    flex: 1 1 300px;
    margin: 0;
    width: auto;
    min-width: 300px;
    max-width: 100%;
}

/* Search selection line overrides (must come after status styles) */
.tree-node.search-target::before,
.tree-node.search-match::before {
    background: var(--status-warning);
    opacity: 1;
}

.tree-node.search-target > .tree-node-content,
.tree-node.search-match > .tree-node-content {
    border-left-color: var(--status-warning);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}