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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #059669;
    --danger-color: #dc2626;
    --warning-color: #d97706;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --border-radius: 8px;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
}

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

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

header p {
    font-size: 1.125rem;
    color: var(--gray-600);
}

.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 24px;
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 20px;
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 16px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-header h2 {
    margin-bottom: 0;
}

.scenario-controls {
    display: flex;
    gap: 8px;
}

.view-toggle {
    display: flex;
    gap: 4px;
    background-color: var(--gray-100);
    border-radius: var(--border-radius);
    padding: 4px;
}

.view-toggle .btn {
    padding: 6px 12px;
    font-size: 0.75rem;
}

.view-toggle .btn.active {
    background-color: white;
    box-shadow: var(--shadow);
    color: var(--gray-900);
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

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

.input-group label {
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 6px;
    font-size: 0.875rem;
}

.input-group input {
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.input-group input:invalid {
    border-color: var(--danger-color);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
    padding: 6px 12px;
    font-size: 0.75rem;
}

.btn-danger:hover {
    background-color: #b91c1c;
}

.btn-secondary {
    background-color: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background-color: var(--gray-300);
}

.btn-secondary.active {
    background-color: var(--primary-color);
    color: white;
}

.scenario-row {
    display: grid;
    grid-template-columns: 1fr 120px 120px 100px 100px auto;
    gap: 16px;
    align-items: end;
    padding: 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    background-color: var(--gray-50);
}

.scenario-row.active {
    border-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
}

/* Removing duplicate definition - it's redefined below with upsells */

.metrics-section {
    margin-bottom: 32px;
}

.metrics-section:last-child {
    margin-bottom: 0;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.metric {
    display: flex;
    flex-direction: column;
    padding: 16px;
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
}

.metric-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
    margin-bottom: 4px;
}

.metric-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
}

.metric-value.revenue {
    color: var(--primary-color);
}

.metric-value.profit.positive {
    color: var(--success-color);
}

.metric-value.profit.negative {
    color: var(--danger-color);
}

.product-result {
    padding: 16px;
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
    margin-bottom: 16px;
}

.product-result h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.product-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
}

.product-metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--gray-200);
}

.product-metric:last-child {
    border-bottom: none;
}

.product-metric-label {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.product-metric-value {
    font-weight: 600;
    color: var(--gray-900);
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray-500);
}

.empty-state h3 {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 16px;
    }

    header h1 {
        font-size: 2rem;
    }

    .card {
        padding: 16px;
    }

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

    .scenario-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .product-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .radio-group {
        gap: 8px;
    }

    .radio-option {
        padding: 10px 12px;
    }

    .upsell-inputs {
        gap: 6px;
    }

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

    .section-header {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }

    .product-metrics {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.75rem;
    }

    .card {
        padding: 12px;
        margin-bottom: 16px;
    }

    .metric {
        padding: 12px;
    }

    .product-result {
        padding: 12px;
    }
}

/* Comparison Table Styles */
.comparison-table {
    overflow-x: auto;
    margin-bottom: 24px;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.comparison-table th,
.comparison-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.comparison-table th {
    background-color: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
}

.comparison-table td {
    font-size: 0.875rem;
}

.comparison-table .scenario-name {
    font-weight: 600;
    color: var(--primary-color);
}

.comparison-table .positive {
    color: var(--success-color);
    font-weight: 600;
}

.comparison-table .negative {
    color: var(--danger-color);
    font-weight: 600;
}

.comparison-table .best-value {
    background-color: rgba(5, 150, 105, 0.1);
    font-weight: 600;
}

/* Funnel Setup Styles */
.funnel-setup {
    margin-bottom: 20px;
}

.setup-question h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 16px;
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.radio-option {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s;
}

.radio-option:hover {
    border-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
}

.radio-option input[type="radio"] {
    margin-right: 12px;
    accent-color: var(--primary-color);
}

.radio-option input[type="radio"]:checked + .radio-label {
    font-weight: 600;
    color: var(--primary-color);
}

.radio-label {
    font-size: 0.95rem;
    color: var(--gray-700);
}

/* Product row with upsells */
.product-row {
    display: grid;
    grid-template-columns: 1fr 120px 120px 120px 120px auto;
    gap: 16px;
    align-items: end;
    padding: 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    background-color: var(--gray-50);
}

.upsell-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.upsell-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.upsell-toggle input[type="checkbox"] {
    accent-color: var(--primary-color);
}

.upsell-inputs {
    display: none;
    gap: 8px;
    flex-direction: column;
}

.upsell-inputs.active {
    display: flex;
}

.upsell-inputs input {
    padding: 6px 8px;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    font-size: 0.875rem;
}

.scenario-controls, .product-controls {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--gray-200);
}

/* Animation for smooth transitions */
.metric-value {
    transition: color 0.3s ease;
}

.scenario-row {
    transition: all 0.3s ease;
}

.scenario-row:hover {
    box-shadow: var(--shadow);
}

.product-row {
    transition: all 0.3s ease;
}

.product-row:hover {
    box-shadow: var(--shadow);
}

/* Loading states */
.calculating {
    opacity: 0.7;
    pointer-events: none;
}

/* Focus styles for accessibility */
.btn:focus,
input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .btn {
        display: none;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
}