/* CENTER — SPHERE GRID */
        .sphere-grid-panel {
            position: relative;
            overflow: hidden;
            background: radial-gradient(ellipse at 50% 50%, #030d1f 0%, var(--void) 80%);
        }

        .grid-controls {
            position: absolute;
            top: 16px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 8px;
            z-index: 20;
            align-items: center;
        }

        .filter-btn {
            font-family: 'Cinzel', serif;
            font-size: 9px;
            letter-spacing: 2px;
            padding: 5px 12px;
            border-radius: 14px;
            cursor: pointer;
            border: none;
            background: rgba(10,22,40,0.9);
            border: 1px solid var(--border);
            color: var(--text-mid);
            transition: all 0.2s;
        }

            .filter-btn:hover, .filter-btn.active {
                border-color: var(--glow-blue);
                color: var(--glow-blue);
                background: rgba(74,158,255,0.08);
                box-shadow: 0 0 10px rgba(74,158,255,0.2);
            }

        #sphere-canvas {
            width: 100%;
            height: 100%;
            display: block;
            touch-action: none;
        }

        .node-tooltip {
            position: absolute;
            pointer-events: none;
            background: rgba(5,13,24,0.95);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 12px 16px;
            min-width: 180px;
            backdrop-filter: blur(10px);
            z-index: 30;
            opacity: 0;
            transition: opacity 0.15s;
            box-shadow: 0 8px 32px rgba(0,0,0,0.5);
        }

            .node-tooltip.visible {
                opacity: 1;
            }

        .tt-name {
            font-family: 'Cinzel', serif;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .tt-type {
            font-size: 10px;
            color: var(--text-mid);
            font-family: 'Share Tech Mono', monospace;
            letter-spacing: 1px;
            margin-bottom: 8px;
        }

        .tt-level {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 6px;
        }

        .tt-xp-bar {
            height: 3px;
            background: rgba(255,255,255,0.05);
            border-radius: 2px;
            overflow: hidden;
            margin-top: 4px;
        }

        .tt-xp-fill {
            height: 100%;
            border-radius: 2px;
            transition: width 0.4s;
        }

        /* SIDEBAR RIGHT */