.substance-table th {
            background-color: #f1f3f5;
        }.case-study, .lab-guide {
    background: #f0f7ff;
    border-left: 6px solid #0d6efd;
    padding: 1.2rem 1.5rem;
    border-radius: 20px;
    margin: 1.8rem 0;
}.example-btn{font-size:0.8rem;padding: 0.25rem;}
        .energy-bar-container {
            background-color: #e9ecef;
            border-radius: 20px;
            height: 30px;
            width: 100%;
            overflow: hidden;
            margin: 15px 0;
        }
        .energy-bar-fill {
            background: linear-gradient(90deg, #0d6efd, #0b5ed7);
            width: 0%;
            height: 100%;
            border-radius: 20px;
            transition: width 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: flex-end;
            padding-right: 10px;
            color: white;
            font-weight: bold;
            font-size: 0.8rem;
        }
        .legend-color {
            width: 16px;
            height: 16px;
            border-radius: 4px;
            display: inline-block;
        }
        .input-group-custom {
            margin-bottom: 1rem;
        }
        .unit-note {
            font-size: 0.8rem;
            color: #6c757d;
        }