.input-group-custom { margin-bottom: 1rem; }
        .result-value.primary { color: #0d6efd; }
        .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; }
        .geometry-canvas { width: 100%; height: auto; background-color: #fafcfa; border: 1px solid #ddd; border-radius: 8px; margin-top: 1.5rem; display: block; }
        .canvas-container { text-align: center; margin-top: 1rem; }
        .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%; display: inline-block; }
        .legend-color.blue { background-color: #0d6efd; }
        .legend-color.red { background-color: #dc3545; }
        .legend-color.green { background-color: #28a745; }
        .legend-color.orange { background-color: #fd7e14; }
        .legend-color.gray { background-color: #6c757d; }
        .legend-line { width: 24px; height: 3px; display: inline-block; }
        .legend-line.blue { background-color: #0d6efd; }
        .legend-line.green { background-color: #28a745; }
        .legend-line.dashed { background: transparent; border-bottom: 2px dashed #28a745; width: 24px; height: 0; }
        .data-table-wrap { overflow-x: auto; max-height: 320px; overflow-y: auto; }
        .data-table-wrap table { width: 100%; border-collapse: collapse; }
        .data-table-wrap th { background: #f1f3f5; position: sticky; top: 0; z-index: 2; padding: 0.5rem 0.25rem; text-align: center; border-bottom: 2px solid #dee2e6; }
        .data-table-wrap td { padding: 0.25rem; text-align: center; vertical-align: middle; }
        .data-table-wrap input[type="number"] { width: 80px; padding: 0.3rem 0.4rem; border: 1px solid #ced4da; border-radius: 4px; font-size: 0.9rem; text-align: center; }
        .data-table-wrap .remove-row-btn { background: none; border: none; color: #dc3545; font-size: 1.1rem; cursor: pointer; padding: 0 0.3rem; }
        .data-table-wrap .remove-row-btn:hover { color: #a71d2a; }
        .data-table-wrap .row-index { font-weight: 600; color: #6c757d; font-size: 0.85rem; }
        .add-row-area { display: flex; gap: 0.5rem; margin-top: 0.5rem; flex-wrap: wrap; align-items: center; }
        .stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0.75rem; margin: 1rem 0; }
        .stats-card { background: #f8f9fa; border-radius: 6px; padding: 0.75rem 1rem; text-align: center; border: 1px solid #e9ecef; }
        .stats-card .label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.5px; color: #6c757d; }
        .stats-card .value { font-size: 1.4rem; font-weight: 700; color: #1a6e3c; }
        .stats-card .value.primary { color: #0d6efd; }
        .stats-card .value.danger { color: #dc3545; }
        .result-block { background: #f8fafc; border-radius: 8px; padding: 1.25rem; border: 1px solid #e9ecef; margin: 0.75rem 0; }
        .result-block .equation { font-size: 1.3rem; font-family: 'Cambria Math', serif; text-align: center; padding: 0.5rem 0; }
        .interval-display { display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap; font-size: 1.2rem; padding: 0.5rem 0; }
        .interval-display .lower { color: #dc3545; }
        .interval-display .upper { color: #0d6efd; }
        .interval-display .prediction { color: #28a745; font-weight: 700; }
        .example-presets { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.5rem 0 1rem 0; }
        .example-presets .preset-btn { background: #e9ecef; border: 1px solid #dee2e6; border-radius: 20px; padding: 0.2rem 0.8rem; font-size: 0.8rem; cursor: pointer; transition: all 0.2s; color: #495057; }
        .example-presets .preset-btn:hover { background: #28a745; color: white; border-color: #28a745; }
        .comparison-table td:first-child { font-weight: 600; }
        .bulk-input-area { background: #f8f9fa; border: 1px dashed #ced4da; border-radius: 8px; padding: 1rem; margin: 0.5rem 0 1rem 0; }
        .bulk-input-area textarea { font-family: 'Courier New', monospace; font-size: 0.9rem; resize: vertical; }
        .bulk-input-area .hint { font-size: 0.85rem; color: #6c757d; }
        @media (max-width: 576px) {
            .data-table-wrap input[type="number"] { width: 60px; font-size: 0.8rem; }
            .interval-display { gap: 1rem; font-size: 1rem; }
            .stats-grid { grid-template-columns: 1fr 1fr; }
        }