.input-group-custom {
            margin-bottom: 1rem;
        }
        .deep-dive {
            margin: 1.8rem 0;
        }
        .deep-dive p {
            text-align: justify;
        }
        .unit-note {
            font-size: 0.9rem;
            color: #6c757d;
        }
        .coord-input {
            margin-bottom: 0.5rem;
        }
        .distribution-canvas {
            width: 100%;
            height: auto;
            background-color: #f9f9f9;
            border: 1px solid #ddd;
            border-radius: 8px;
            margin-top: 1.5rem;
            display: block;
            position: relative;
            cursor: crosshair;
        }
        .canvas-container {
            text-align: center;
            margin-top: 1rem;
            position: relative;
        }
        .canvas-tooltip {
            position: absolute;
            background: rgba(0,0,0,0.8);
            color: #fff;
            padding: 6px 12px;
            border-radius: 4px;
            font-size: 0.8rem;
            pointer-events: none;
            display: none;
            font-family: 'Courier New', monospace;
            z-index: 10;
            border: 1px solid #555;
            white-space: nowrap;
        }
        .legend {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin: 0.5rem 0;
            font-size: 0.9rem;
            flex-wrap: wrap;
        }
        .legend-item {
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .legend-color {
            width: 16px;
            height: 16px;
            border-radius: 50%;
        }
        .legend-color.blue { background-color: #0d6efd; }
        .legend-color.orange { background-color: #fd7e14; }
        .legend-color.green { background-color: #198754; }
        .legend-color.red { background-color: #dc3545; }
        .legend-color.purple { background-color: #6f42c1; }
        .distribution-type-selector {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        .distribution-type-selector .btn-group {
            width: 100%;
            max-width: 400px;
        }
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 1rem;
            margin: 1rem 0;
        }
        .stat-card {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 1rem;
            text-align: center;
            border: 1px solid #e9ecef;
        }
        .stat-card .stat-label {
            font-size: 0.85rem;
            color: #6c757d;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .stat-card .stat-value {
            font-size: 1.6rem;
            font-weight: 600;
            color: var(--primary-color);
            font-family: 'Cambria Math', serif;
        }
        .param-input-group {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .param-input-group .form-group {
            flex: 1;
            min-width: 120px;
        }
        .formula-box {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1rem 0;
            border: 1px solid #e9ecef;
            font-family: 'Cambria Math', serif;
            font-size: 1.1rem;
            text-align: center;
        }
        .toggle-label {
            font-weight: 500;
            margin-right: 0.5rem;
        }
        .pmf-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
            margin: 1rem 0 0.5rem 0;
            justify-content: center;
        }
        .pmf-item {
            background: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 6px;
            padding: 0.4rem 0.8rem;
            text-align: center;
            min-width: 60px;
            transition: all 0.2s;
        }
        .pmf-item.highlight {
            background: #0d6efd;
            color: white;
            border-color: #0d6efd;
            transform: scale(1.05);
            box-shadow: 0 4px 8px rgba(13,110,253,0.3);
        }
        .pmf-item .pmf-k {
            display: block;
            font-weight: 600;
            font-size: 0.9rem;
        }
        .pmf-item .pmf-p {
            display: block;
            font-size: 0.75rem;
            font-family: 'Courier New', monospace;
            opacity: 0.85;
        }
        .pmf-item.highlight .pmf-p {
            opacity: 1;
        }
        @media (max-width: 576px) {
            .stat-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .param-input-group .form-group {
                min-width: 80px;
            }
            .pmf-item {
                min-width: 45px;
                padding: 0.2rem 0.5rem;
            }
        }