.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; }
        .geometry-canvas { width: 100%; height: auto; background-color: #f9f9f9; 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%; }
        .legend-color.paver { background-color: #8B7355; }
        .legend-color.sand { background-color: #f4d58d; }
        .legend-color.gravel { background-color: #9e9e9e; }
        .legend-color.border { background-color: #2c3e50; }
        .result-summary-card { background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%); border-radius: 12px; padding: 1.5rem; margin: 1rem 0; border: 1px solid #dee2e6; }
        .material-breakdown { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin: 1rem 0; }
        .material-item { background: white; padding: 1rem; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.05); text-align: center; border: 1px solid #eee; }
        .material-item .quantity { font-size: 1.8rem; font-weight: 700; color: var(--primary-color); }
        .material-item .label { font-size: 0.9rem; color: #6c757d; }
        .material-item .unit { font-size: 0.8rem; color: #6c757d; }
        .pattern-selector { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.5rem 0; }
        .pattern-btn { padding: 0.4rem 1rem; border: 2px solid #ddd; border-radius: 20px; background: white; cursor: pointer; transition: all 0.2s; font-size: 0.9rem; }
        .pattern-btn.active { border-color: var(--primary-color); background: rgba(70, 130, 180, 0.1); font-weight: 600; }
        .pattern-btn:hover { border-color: var(--primary-color); }
        .cost-summary { background: #f1f8e9; border-radius: 8px; padding: 1.2rem; border-left: 4px solid #4caf50; margin: 1rem 0; }
        .estimate-note { font-size: 0.85rem; color: #6c757d; font-style: italic; }
        .input-group-sm-custom { margin-bottom: 0.8rem; }
        .input-group-sm-custom label { font-size: 0.9rem; font-weight: 500; }
        .input-group-sm-custom