* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
            color: white;
            padding: 30px;
            text-align: center;
        }

        .header h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
            font-weight: 300;
        }

        .header p {
            font-size: 1.1em;
            opacity: 0.9;
        }

        .main-content {
            padding: 40px;
        }

        .form-section {
            background: #f8f9fa;
            padding: 30px;
            border-radius: 15px;
            margin-bottom: 30px;
            border-left: 5px solid #3498db;
        }

        .form-section h2 {
            color: #2c3e50;
            margin-bottom: 20px;
            font-size: 1.5em;
        }

        .form-row {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr auto;
            gap: 15px;
            align-items: center;
            margin-bottom: 15px;
            padding: 15px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        }

        .form-group {
            display: flex;
            flex-direction: column;
        }

        label {
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 5px;
            font-size: 0.9em;
        }

        select, input {
            padding: 12px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 1em;
            transition: all 0.3s ease;
            background: white;
        }

        select:focus, input:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
        }

        .btn {
            padding: 12px 20px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .btn-primary {
            background: linear-gradient(135deg, #3498db, #2980b9);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
        }

        .btn-success {
            background: linear-gradient(135deg, #27ae60, #2ecc71);
            color: white;
        }

        .btn-success:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(39, 174, 96, 0.3);
        }

        .btn-danger {
            background: linear-gradient(135deg, #e74c3c, #c0392b);
            color: white;
            padding: 8px 12px;
            font-size: 0.9em;
        }

        .btn-danger:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
        }

        .btn-download {
            background: linear-gradient(135deg, #9b59b6, #8e44ad);
            color: white;
            font-size: 1em;
            padding: 12px 20px;
            margin: 5px;
            border-radius: 8px;
            min-width: 160px;
        }

        .btn-download:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(155, 89, 182, 0.3);
        }

        .total-section {
            background: linear-gradient(135deg, #34495e, #2c3e50);
            color: white;
            padding: 30px;
            border-radius: 15px;
            margin-top: 30px;
        }

        .total-row {
            display: flex;
            justify-content: space-between;
            margin-bottom: 15px;
            padding: 10px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .total-row:last-child {
            border-bottom: none;
            font-size: 1.3em;
            font-weight: bold;
            margin-top: 10px;
            padding-top: 20px;
            border-top: 2px solid rgba(255, 255, 255, 0.3);
        }

        .line-total {
            font-weight: bold;
            color: #27ae60;
            font-size: 1.1em;
        }

        .additional-charges {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 20px;
        }

        .charge-input {
            display: flex;
            flex-direction: column;
        }

        .charge-input label {
            color: #2c3e50;
            margin-bottom: 8px;
        }

        .items-summary {
            background: #ecf0f1;
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 20px;
        }

        .items-summary h3 {
            color: #2c3e50;
            margin-bottom: 15px;
        }

        .summary-item {
            display: flex;
            justify-content: space-between;
            padding: 8px 0;
            border-bottom: 1px solid #bdc3c7;
        }

        .summary-item:last-child {
            border-bottom: none;
        }

        @media (max-width: 1024px) {
            .form-row {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            
            .form-row .form-group:first-child {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 768px) {
            body {
                padding: 10px;
            }
            
            .form-row {
                grid-template-columns: 1fr;
                gap: 10px;
                padding: 20px 15px;
            }
            
            .additional-charges {
                grid-template-columns: 1fr;
                gap: 15px;
            }
            
            .header {
                padding: 20px;
            }
            
            .header h1 {
                font-size: 2em;
            }
            
            .header p {
                font-size: 1em;
            }
            
            .main-content {
                padding: 20px;
            }
            
            .form-section {
                padding: 20px;
            }
            
            .total-section {
                padding: 20px;
            }
            
            .total-row {
                flex-direction: column;
                text-align: center;
                gap: 5px;
            }
            
            .total-row span:last-child {
                font-weight: bold;
                color: #3498db;
            }
            
            .btn-download {
                width: 100%;
                padding: 15px;
                font-size: 1.1em;
            }
        }

        @media (max-width: 480px) {
            .container {
                margin: 0;
                border-radius: 0;
            }
            
            .header h1 {
                font-size: 1.8em;
            }
            
            .main-content {
                padding: 15px;
            }
            
            .form-section {
                padding: 15px;
            }
            
            select, input {
                padding: 10px;
                font-size: 16px; /* Prevents zoom on iOS */
            }
            
            .btn {
                padding: 10px 15px;
                font-size: 0.9em;
            }
        }

        .materials-info {
            background: #e8f5e8;
            border: 1px solid #27ae60;
            border-radius: 10px;
            padding: 20px;
            margin-bottom: 20px;
        }

        .materials-info h3 {
            color: #27ae60;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .materials-info p {
            color: #2c3e50;
            margin: 5px 0;
            font-size: 0.9em;
        }

        .materials-count {
            background: #27ae60;
            color: white;
            padding: 2px 8px;
            border-radius: 12px;
            font-size: 0.8em;
            font-weight: bold;
        }

        .fade-in {
            animation: fadeIn 0.5s ease-in;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }