:root {
            --primary: #4361ee;
            --primary-hover: #3a56d2;
            --success: #2ecc71;
            --danger: #e74c3c;
            --warning: #f39c12;
            --gray: #6c757d;
            --light: #f8f9fa;
            --white: #ffffff;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            padding: 20px;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
        }

        h1 {
            text-align: center;
            color: var(--primary);
            margin-bottom: 30px;
            font-weight: 600;
            font-size: 28px;
        }

        .form-card {
            background-color: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 30px;
            margin-bottom: 25px;
        }

        .field-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            color: var(--gray);
            font-weight: 500;
            font-size: 14px;
        }

        input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 16px;
            transition: var(--transition);
            outline: none;
        }

        input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }

        button {
            background-color: var(--primary);
            color: var(--white);
            border: none;
            border-radius: var(--border-radius);
            padding: 14px 24px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            width: 100%;
            transition: var(--transition);
        }

        button:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
        }

        button:active {
            transform: translateY(0);
        }

        .result, .error {
            padding: 20px;
            border-radius: var(--border-radius);
            margin-top: 25px;
            line-height: 1.6;
        }

        .result {
            background-color: rgba(46, 204, 113, 0.1);
            border-left: 4px solid var(--success);
        }

        .error {
            background-color: rgba(231, 76, 60, 0.1);
            border-left: 4px solid var(--danger);
            color: var(--danger);
        }

        .result h3, .error h3 {
            margin: 0 0 15px 0;
            font-size: 18px;
            font-weight: 600;
        }

        .summary {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
            margin: 20px 0;
        }

        .summary-item {
            background-color: var(--light);
            padding: 15px;
            border-radius: var(--border-radius);
            text-align: center;
        }

        .summary-label {
            color: var(--gray);
            font-size: 14px;
            margin-bottom: 5px;
        }

        .summary-value {
            font-size: 18px;
            font-weight: 600;
            color: var(--primary);
        }
		        .break-even-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
        }

        .break-even-table th,
        .break-even-table td {
            padding: 12px;
            text-align: left;
            border-bottom: 1px solid #eee;
        }

        .break-even-tablet th {
            background-color: var(--light);
            color: var(--gray);
        }

        .back-link {
            display: block;
            text-align: center;
            width: 100%;
            text-decoration: none;
            margin: 30px auto;
            color: var(--primary);
            font-weight: 500;
            font-size: 16px;
        }

        .back-link:hover {
            text-decoration: underline;
            color: var(--primary-hover);
        }

        @media (max-width: 768px) {
            .container {
                padding: 15px;
            }

            .form-card {
                padding: 20px;
            }

            input, button {
                font-size: 15px;
                padding: 10px 12px;
            }

            button {
                padding: 12px 20px;
            }

            .summary {
                grid-template-columns: 1fr;
            }
        }