.calc-hero {
            background: linear-gradient(135deg, #e74c3c, #c0392b);
            color: white;
            padding: 3rem 0;
            text-align: center;
        }
        
        .calc-hero h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }
        
        .calc-hero p {
            font-size: 1.2rem;
        }
        
        .calculator-container {
            max-width: 800px;
            margin: 0 auto;
            padding: 2rem;
        }
        
        .step {
            background: white;
            border-radius: 10px;
            padding: 2rem;
            margin: 2rem 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .step h3 {
            margin-bottom: 1.5rem;
            color: #2c3e50;
            font-size: 1.3rem;
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: bold;
        }
        
        .form-group input,
        .form-group select {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 1rem;
        }
        
        .chips {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        
        .chip {
            padding: 0.75rem 1.5rem;
            background: #ecf0f1;
            border: 2px solid #bdc3c7;
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 500;
        }
        
        .chip:hover {
            background: #d5dbdb;
        }
        
        .chip.active {
            background: #3498db;
            color: white;
            border-color: #3498db;
        }
        
        .toggle {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .toggle input[type="checkbox"] {
            width: auto;
            transform: scale(1.2);
        }
        
        .results {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 2rem;
            margin: 2rem 0;
            border-left: 4px solid #3498db;
        }
        
        .results h4 {
            color: #2c3e50;
            margin-bottom: 1rem;
            font-size: 1.2rem;
        }
        
        .result-row {
            display: flex;
            justify-content: space-between;
            margin: 1rem 0;
            padding: 0.75rem 0;
            border-bottom: 1px solid #dee2e6;
        }
        
        .result-row:last-child {
            border-bottom: none;
        }
        
        .result-row span:first-child {
            font-weight: 600;
        }
        
        .result-row span:last-child {
            color: #e74c3c;
            font-weight: bold;
        }
        
        .error {
            background: #f8d7da;
            color: #721c24;
            padding: 1rem;
            border-radius: 5px;
            margin: 1rem 0;
            border-left: 4px solid #dc3545;
        }
        
        .hidden {
            display: none;
        }
        
        .btn {
            background: #3498db;
            color: white;
            padding: 0.75rem 1.5rem;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            text-decoration: none;
            display: inline-block;
            transition: background 0.3s;
            font-size: 1rem;
            font-weight: 500;
        }
        
        .btn:hover {
            background: #2980b9;
        }
        
        .btn-success {
            background: #27ae60;
        }
        
        .btn-success:hover {
            background: #219a52;
        }
        
        .action-buttons {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            justify-content: center;
            margin: 2rem 0;
        }
        
        .whatsapp-btn {
            background: #25d366;
        }
        
        .whatsapp-btn:hover {
            background: #128c7e;
        }
        
        @media (max-width: 768px) {
            .calc-hero h1 {
                font-size: 2rem;
            }
            
            .calculator-container {
                padding: 1rem;
            }
            
            .step {
                padding: 1.5rem;
            }
            
            .chips {
                justify-content: center;
            }
            
            .chip {
                padding: 0.5rem 1rem;
                font-size: 0.9rem;
            }
            
            .result-row {
                flex-direction: column;
                gap: 0.5rem;
                align-items: flex-start;
            }
            
            .action-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .action-buttons .btn {
                width: 100%;
                max-width: 250px;
            }
        }
        
        /* Loading animation */
        .loading {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid #f3f3f3;
            border-top: 3px solid #3498db;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }