/* electron_config.css — nucleus, electron shells and the highlighted valence (outer) shell. */
.lv-shell { fill: none; stroke: rgba(148, 163, 184, 0.35); stroke-width: 1.2; }
.lv-shell-val { stroke: rgba(104, 130, 176, 0.6); stroke-dasharray: 4 3; }
.lv-elec { fill: #38bdf8; stroke: #0a0f1a; stroke-width: 0.8; }
.lv-elec-val { fill: #a9c0e2; }
.lv-nucleus { fill: rgba(251, 113, 133, 0.85); stroke: #fb7185; stroke-width: 1.6; }
.lv-nuclbl { fill: #fff; font-size: 16px; font-weight: 800; }