.isotope-table-container {
            overflow-x: auto;
            margin: 1.5rem 0;
        }
        .isotope-table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        }
        .isotope-table th, .isotope-table td {
            padding: 12px 8px;
            text-align: center;
            border-bottom: 1px solid #e9ecef;
            vertical-align: middle;
        }
        .isotope-table th {
            background-color: #f1f3f5;
            font-weight: 600;
            color: #1e466e;
        }
        .isotope-table input {
            width: 120px;
            padding: 6px 10px;
            border-radius: 6px;
            border: 1px solid #ced4da;
            font-family: monospace;
            text-align: center;
        }
        .btn-icon {
            background: none;
            border: none;
            font-size: 1.2rem;
            cursor: pointer;
            transition: 0.2s;
            color: #6c757d;
        }
        .btn-icon:hover {
            color: #dc3545;
        }
        .abundance-bar-container {
            background-color: #f8f9fa;
            border-radius: 16px;
            padding: 1rem;
            margin-top: 1.5rem;
        }
        .result-badge {
            font-size: 1.8rem;
            font-weight: 700;
            color: #2c7da0;
        }
        .unit-note {
            font-size: 0.85rem;
            color: #6c757d;
            margin-top: 0.25rem;
        }
        .math-card {
            background-color: rgba(44, 125, 160, 0.05);
            border-left: 4px solid #2c7da0;
            padding: 1rem;
            margin: 1rem 0;
            border-radius: 8px;
        }
        .ref-card {
            background-color: #f8f9fa;
            border-radius: 12px;
            padding: 1.2rem;
            margin: 1rem 0;
        }
        canvas {
            width: 100%;
            height: auto;
            background: #ffffff;
            border-radius: 12px;
            margin-top: 1rem;
        }
        .preset-group {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
            margin: 1rem 0;
        }
        .badge-sum {
            font-size: 0.9rem;
            background-color: #e9ecef;
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
        }