:root {
            --primary-color: #2E7D32;
            --primary-dark: #1B5E20;
            --primary-light: #4CAF50;
            --secondary-color: #FF6B35;
            --accent-color: #FFC107;
            --success-color: #4CAF50;
            --warning-color: #FF9800;
            --error-color: #F44336;
            --text-primary: #212121;
            --text-secondary: #757575;
            --text-light: #FFFFFF;
            --bg-primary: #FFFFFF;
            --bg-secondary: #F5F5F5;
            --bg-tertiary: #E0E0E0;
            --border-color: #BDBDBD;
            --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
            --shadow-md: 0 4px 8px rgba(0,0,0,0.15);
            --shadow-lg: 0 8px 16px rgba(0,0,0,0.2);
            --transition-fast: 0.2s ease;
            --transition-normal: 0.3s ease;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.6;
            color: var(--text-primary);
            background-color: var(--bg-primary);
            font-size: 16px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            text-align: center;
            margin-bottom: 3rem;
            padding: 2rem 0;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            color: var(--text-light);
            border-radius: 12px;
        }

        .header h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            font-weight: 700;
        }

        .header p {
            font-size: 1.25rem;
            opacity: 0.9;
            margin-bottom: 1rem;
        }

        .disclaimer {
            background: var(--warning-color);
            color: var(--text-light);
            padding: 1rem;
            border-radius: 8px;
            margin: 2rem 0;
            font-size: 0.9rem;
        }

        .calculator-section {
            background: var(--bg-secondary);
            padding: 2rem;
            border-radius: 12px;
            margin: 2rem 0;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
        }

        .section-title {
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            font-size: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .input-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
            margin-bottom: 2rem;
        }

        .input-group {
            background: var(--bg-primary);
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: var(--shadow-sm);
        }

        .input-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        .input-group input,
        .input-group select {
            width: 100%;
            padding: 0.75rem;
            border: 2px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            transition: border-color var(--transition-fast);
        }

        .input-group input:focus,
        .input-group select:focus {
            outline: none;
            border-color: var(--primary-color);
        }

        .help-text {
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-top: 0.25rem;
        }

        .dr-selector {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin-top: 1rem;
        }

        .dr-option {
            background: var(--bg-primary);
            border: 2px solid var(--border-color);
            border-radius: 8px;
            padding: 1rem;
            cursor: pointer;
            transition: all var(--transition-normal);
            text-align: center;
        }

        .dr-option:hover {
            border-color: var(--primary-color);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .dr-option.selected {
            border-color: var(--primary-color);
            background: var(--primary-light);
            color: var(--text-light);
        }

        .dr-title {
            font-weight: bold;
            margin-bottom: 0.5rem;
        }

        .dr-stats {
            font-size: 0.875rem;
            opacity: 0.8;
        }

        .results-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            color: var(--text-light);
            padding: 2rem;
            border-radius: 12px;
            margin: 2rem 0;
            box-shadow: var(--shadow-lg);
        }

        .results-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }

        .result-item {
            text-align: center;
            background: rgba(255, 255, 255, 0.1);
            padding: 1.5rem;
            border-radius: 8px;
            backdrop-filter: blur(10px);
        }

        .result-value {
            font-size: 2.5rem;
            font-weight: bold;
            margin-bottom: 0.5rem;
            color: var(--accent-color);
        }

        .result-label {
            font-size: 1rem;
            opacity: 0.9;
        }

        .result-timeframe {
            font-size: 0.875rem;
            opacity: 0.7;
            margin-top: 0.25rem;
        }

        .timeline-section {
            background: var(--bg-primary);
            padding: 2rem;
            border-radius: 12px;
            margin: 2rem 0;
            box-shadow: var(--shadow-sm);
        }

        .timeline {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 2rem;
            position: relative;
        }

        .timeline::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--primary-light);
            z-index: 1;
        }

        .timeline-item {
            background: var(--bg-primary);
            border: 3px solid var(--primary-color);
            border-radius: 50%;
            width: 100px;
            height: 100px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .timeline-week {
            font-weight: bold;
            color: var(--primary-color);
            font-size: 0.875rem;
        }

        .timeline-impact {
            font-size: 0.75rem;
            color: var(--text-secondary);
            margin-top: 0.25rem;
        }

        .calculate-btn {
            background: var(--secondary-color);
            color: var(--text-light);
            padding: 1rem 2rem;
            font-size: 1.125rem;
            font-weight: bold;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-md);
            width: 100%;
            margin-top: 1rem;
        }

        .calculate-btn:hover {
            background: #E85A2C;
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .factors-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin-top: 1rem;
        }

        .factor-item {
            background: var(--bg-secondary);
            padding: 1rem;
            border-radius: 6px;
            text-align: center;
        }

        .factor-value {
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--primary-color);
            display: block;
        }

        .factor-label {
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-top: 0.25rem;
        }

        @media (max-width: 768px) {
            .input-grid,
            .dr-selector,
            .results-grid {
                grid-template-columns: 1fr;
            }

            .timeline {
                flex-direction: column;
                gap: 1rem;
            }

            .timeline::before {
                display: none;
            }

            .header h1 {
                font-size: 2rem;
            }
        }

        .hidden {
            display: none;
        }