.concepts-map {
    width: 100%;
    max-height: 72vh;
    overflow-y: auto;
    padding: 1.5rem;
    box-sizing: border-box;
}

/* Scrollbar Customization for modern aesthetic */
.concepts-map::-webkit-scrollbar {
    width: 6px;
}
.concepts-map::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.02);
}
.concepts-map::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}
.concepts-map::-webkit-scrollbar-thumb:hover {
    background: var(--nexus-neon);
}

.empty-map-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    color: rgba(255, 255, 255, 0.4);
    text-align: center;
}

.empty-map-state .dim-icon {
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.2);
}

.timeline-container {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
    padding-left: 0.5rem;
}

.timeline-step {
    display: flex;
    flex-direction: row;
    gap: 1.5rem;
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    margin-bottom: 0.5rem;
}

.timeline-step:hover {
    background: rgba(255, 255, 255, 0.02);
    transform: translateX(4px);
}

.timeline-step.unlocked:hover {
    border-color: rgba(0, 255, 153, 0.15);
    box-shadow: 0 4px 20px rgba(0, 255, 153, 0.05);
}

.timeline-step.selected {
    background: rgba(0, 255, 153, 0.04);
    border-color: var(--nexus-neon);
    box-shadow: 0 0 15px var(--nexus-primary-glow);
}

.node-connector-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 32px;
    position: relative;
    flex-shrink: 0;
}

.node-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
    transition: all 0.3s ease;
    background: #0d0d0d;
}

.unlocked .node-circle {
    border: 2px solid var(--nexus-neon);
    color: var(--nexus-neon);
    box-shadow: 0 0 10px var(--nexus-primary-glow);
}

.locked .node-circle {
    border: 2px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.2);
}

.node-glow {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--nexus-neon);
    opacity: 0.15;
    filter: blur(4px);
    z-index: -1;
    animation: pulse-glow 2s infinite ease-in-out;
}

@keyframes pulse-glow {
    0% { transform: scale(1); opacity: 0.15; }
    50% { transform: scale(1.25); opacity: 0.3; }
    100% { transform: scale(1); opacity: 0.15; }
}

.vertical-track {
    width: 2px;
    position: absolute;
    top: 32px;
    bottom: -18px; /* Extends to link to next node circle */
    z-index: 1;
    transition: all 0.3s ease;
}

.track-active {
    background: linear-gradient(180deg, var(--nexus-neon), rgba(0, 255, 153, 0.2));
    box-shadow: 0 0 6px var(--nexus-primary-glow);
}

.track-inactive {
    background: rgba(255, 255, 255, 0.08);
}

.node-content {
    flex-grow: 1;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(4px);
}

.timeline-step.selected .node-content {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(0, 255, 153, 0.2);
}

.node-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.segment-tag {
    font-family: 'Outfit', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.4);
}

.unlocked .segment-tag {
    color: var(--nexus-neon);
}

.badge {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-weight: 500;
}

.badge-unlocked {
    background: rgba(0, 255, 153, 0.08);
    color: var(--nexus-neon);
    border: 1px solid rgba(0, 255, 153, 0.2);
}

.badge-locked {
    background: rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.03);
}

.node-title {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    transition: color 0.2s ease;
}

.timeline-step.unlocked:hover .node-title {
    color: var(--nexus-neon);
}

.locked .node-title {
    color: rgba(255, 255, 255, 0.4);
}

.node-desc {
    margin: 0;
    font-size: 0.8rem;
    line-height: 1.4;
    color: rgba(255, 255, 255, 0.5);
}

.locked .node-desc {
    color: rgba(255, 255, 255, 0.3);
}

.check-icon {
    color: var(--nexus-neon);
}

.lock-icon {
    color: rgba(255, 255, 255, 0.2);
}

/* ============================================================
   LIGHT THEME OVERRIDES — "Warm Paper / Soft Sepia"
   ============================================================ */

.theme-light .concepts-map::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

.theme-light .empty-map-state {
    background: rgba(0, 0, 0, 0.01);
    border-color: var(--border);
    color: var(--text-muted);
}

.theme-light .empty-map-state .dim-icon {
    color: var(--text-muted);
    opacity: 0.4;
}

.theme-light .timeline-step:hover {
    background: rgba(0, 0, 0, 0.02);
}

.theme-light .timeline-step.unlocked:hover {
    border-color: rgba(16, 185, 129, 0.15);
    box-shadow: 0 4px 20px rgba(16, 185, 129, 0.05);
}

.theme-light .timeline-step.selected {
    background: rgba(16, 185, 129, 0.04);
    border-color: var(--accent);
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.15);
}

.theme-light .node-circle {
    background: var(--bg-surface);
}

.theme-light .unlocked .node-circle {
    background: var(--bg-surface);
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: none;
}

.theme-light .locked .node-circle {
    background: var(--bg-base);
    border-color: var(--border);
    color: var(--text-muted);
}

.theme-light .node-glow {
    display: none;
}

.theme-light .track-active {
    background: var(--accent);
    box-shadow: none;
}

.theme-light .track-inactive {
    background: var(--border);
}

.theme-light .node-content {
    background: var(--bg-surface);
    border: 1px solid var(--border);
}

.theme-light .timeline-step.selected .node-content {
    background: var(--bg-surface);
    border-color: rgba(16, 185, 129, 0.2);
}

.theme-light .segment-tag {
    color: var(--text-muted);
}

.theme-light .unlocked .segment-tag {
    color: var(--accent);
}

.theme-light .badge-unlocked {
    background: rgba(16, 185, 129, 0.08);
    color: var(--accent);
    border-color: rgba(16, 185, 129, 0.2);
}

.theme-light .badge-locked {
    background: var(--bg-base);
    color: var(--text-muted);
    border-color: var(--border);
}

.theme-light .node-title {
    color: var(--text-main);
}

.theme-light .timeline-step.unlocked:hover .node-title {
    color: var(--accent);
}

.theme-light .locked .node-title {
    color: var(--text-muted);
}

.theme-light .node-desc {
    color: var(--text-muted);
}

.theme-light .locked .node-desc {
    color: var(--text-muted);
}

.theme-light .check-icon {
    color: var(--accent);
}

.theme-light .lock-icon {
    color: var(--text-muted);
}