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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: linear-gradient(135deg, #f0f4f8 0%, #e8eef5 100%);
            min-height: 100vh;
            padding: 20px;
            line-height: 1.6;
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
        }

        .header {
            text-align: center;
            margin-bottom: 50px;
            background: white;
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
        }

        .header h1 {
            font-size: 2.5rem;
            color: #1a202c;
            margin-bottom: 15px;
        }

        .header p {
            font-size: 1.1rem;
            color: #4a5568;
        }

        @media (max-width: 640px) {
            .header h1 {
                font-size: 1.8rem;
            }
            .header p {
                font-size: 0.95rem;
            }
        }

        .content-section {
            background: white;
            border-radius: 12px;
            padding: 40px;
            margin-bottom: 30px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
        }

        .content-section h2 {
            font-size: 1.8rem;
            color: #1a202c;
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 3px solid #3182ce;
        }

        .content-section h3 {
            font-size: 1.3rem;
            color: #2d3748;
            margin-top: 25px;
            margin-bottom: 15px;
        }

        .content-section p {
            color: #4a5568;
            margin-bottom: 15px;
            font-size: 1rem;
        }

        .highlight-box {
            background: linear-gradient(135deg, #f0f9ff 0%, #f0f9ff 100%);
            border-left: 4px solid #3182ce;
            padding: 20px;
            border-radius: 8px;
            margin: 20px 0;
        }

        .highlight-box.success {
            background: linear-gradient(135deg, #f0fdf4 0%, #f0fdf4 100%);
            border-left-color: #22c55e;
        }

        .highlight-box.warning {
            background: linear-gradient(135deg, #fffbf0 0%, #fffbf0 100%);
            border-left-color: #f97316;
        }

        .formula-box {
            background: #f7fafc;
            border: 2px solid #e2e8f0;
            padding: 20px;
            border-radius: 8px;
            font-family: 'Courier New', monospace;
            font-size: 1.1rem;
            color: #2d3748;
            margin: 20px 0;
            overflow-x: auto;
        }

        .formula-box strong {
            color: #3182ce;
        }

        .step-list {
            list-style: none;
            margin: 20px 0;
        }

        .step-list li {
            padding: 15px;
            margin-bottom: 10px;
            background: #f7fafc;
            border-left: 4px solid #3182ce;
            border-radius: 4px;
            color: #2d3748;
        }

        .step-list li strong {
            color: #3182ce;
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            overflow-x: auto;
        }

        .comparison-table th {
            background: #3182ce;
            color: white;
            padding: 15px;
            text-align: left;
            font-weight: 600;
        }

        .comparison-table td {
            padding: 15px;
            border-bottom: 1px solid #e2e8f0;
        }

        .comparison-table tr:nth-child(even) {
            background: #f7fafc;
        }

        .comparison-table .positive {
            color: #22c55e;
            font-weight: 600;
        }

        .comparison-table .negative {
            color: #ef4444;
            font-weight: 600;
        }

        .icon-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }

        .icon-card {
            background: linear-gradient(135deg, #f0f9ff 0%, #f0f9ff 100%);
            border: 2px solid #3182ce;
            border-radius: 8px;
            padding: 20px;
            text-align: center;
        }

        .icon-card .icon {
            font-size: 2.5rem;
            margin-bottom: 10px;
        }

        .icon-card h4 {
            color: #1a202c;
            margin-bottom: 10px;
        }

        .icon-card p {
            color: #4a5568;
            font-size: 0.9rem;
        }

        .example-box {
            background: linear-gradient(135deg, #faf5ff 0%, #faf5ff 100%);
            border: 2px solid #a855f7;
            border-radius: 8px;
            padding: 25px;
            margin: 30px 0;
        }

        .example-box h4 {
            color: #a855f7;
            margin-bottom: 15px;
            font-size: 1.2rem;
        }

        .example-box .calculation {
            background: white;
            padding: 15px;
            border-radius: 4px;
            margin: 10px 0;
            font-family: 'Courier New', monospace;
            color: #2d3748;
        }

        .faq-section {
            margin-top: 30px;
        }

        .faq-item {
            background: #f7fafc;
            border-left: 4px solid #3182ce;
            padding: 20px;
            margin-bottom: 15px;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .faq-item:hover {
            background: #eef2f7;
            transform: translateX(5px);
        }

        .faq-item h4 {
            color: #1a202c;
            margin-bottom: 10px;
            font-size: 1.1rem;
        }

        .faq-item p {
            color: #4a5568;
            display: none;
        }

        .faq-item.active p {
            display: block;
        }

        .cta-section {
            background: linear-gradient(135deg, #3182ce 0%, #2c5aa0 100%);
            color: white;
            padding: 40px;
            border-radius: 12px;
            text-align: center;
            margin-top: 50px;
        }

        .cta-section h2 {
            color: white;
            border-bottom-color: white;
            margin-bottom: 20px;
        }

        .cta-section p {
            color: rgba(255, 255, 255, 0.9);
            font-size: 1.1rem;
            margin-bottom: 25px;
        }

        .cta-button {
            display: inline-block;
            background: white;
            color: #3182ce;
            padding: 15px 40px;
            border-radius: 8px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
            font-size: 1rem;
        }

        .cta-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
        }

        .benefits-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }

        .benefit-item {
            background: linear-gradient(135deg, #f0fdf4 0%, #f0fdf4 100%);
            border-left: 4px solid #22c55e;
            padding: 20px;
            border-radius: 8px;
        }

        .benefit-item h4 {
            color: #22c55e;
            margin-bottom: 10px;
        }

        .benefit-item p {
            color: #4a5568;
        }

        .footer {
            text-align: center;
            margin-top: 50px;
            padding: 20px;
            color: #718096;
            font-size: 0.9rem;
        }

        @media (max-width: 768px) {
            .content-section {
                padding: 25px;
            }

            .header {
                padding: 25px;
            }

            .comparison-table {
                font-size: 0.9rem;
            }

            .comparison-table th,
            .comparison-table td {
                padding: 10px;
            }
        }