.energy-canvas {
            width: 100%;
            height: 70px;
            background: #e9ecef;
            border-radius: 35px;
            margin: 0.8rem 0;
            position: relative;
            overflow: hidden;
        }
        .energy-fill {
            height: 100%;
            width: 0%;
            background: linear-gradient(90deg, #2c7da0, #61a5c2);
            border-radius: 35px;
            transition: width 0.5s ease;
            display: flex;
            align-items: center;
            justify-content: flex-end;
            padding-right: 12px;
            color: white;
            font-weight: bold;
            white-space: nowrap;
            overflow-x: hidden;
            text-overflow: ellipsis;
        }
        .legend { display: flex; justify-content: center; gap: 1.5rem; margin-top: 0.5rem; font-size: 0.8rem; }
        .legend-color { width: 16px; height: 16px; border-radius: 4px; display: inline-block; margin-right: 5px; }
        .input-group-custom { margin-bottom: 1rem; }
        .mode-selector { margin-bottom: 1.5rem; }
        .mode-btn { cursor: pointer; transition: 0.1s; } 
        .optional-voltage-note { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.25rem; }
        .ah-tooltip { cursor: help; border-bottom: 1px dotted #aaa; }