/* Variables y reset */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --border-radius: 8px;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: #f8fafc;
}

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

/* Header */
.calculator-header {
    text-align: center;
    margin-bottom: 2rem;
}

.calculator-header h1 {
    font-size: 2.5rem;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.lead {
    font-size: 1.25rem;
    color: var(--gray-600);
}

/* Features */
.features-quick {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.feature-badge {
    background: var(--gray-100);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--gray-200);
}

/* Calculator Container */
.calculator-container {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    margin-bottom: 2rem;
}

/* Form Styles */
.calculator-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--gray-800);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-with-prefix {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-prefix .prefix {
    position: absolute;
    left: 1rem;
    color: var(--gray-600);
    font-weight: 500;
}

.input-with-prefix .form-control {
    padding-left: 2.5rem;
}

.help-text {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.error-message {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--danger-color);
}

/* Checkbox */
.checkbox-input {
    margin-right: 0.5rem;
}

/* Tooltip */
.tooltip-icon {
    cursor: help;
    margin-left: 0.25rem;
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    width: 100%;
    padding: 0.75rem 2rem;
    background: var(--gray-200);
    color: var(--gray-800);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 1rem;
}

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

/* Info Box */
.info-box {
    background: var(--gray-100);
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
    margin-top: 1rem;
}

.info-box.detailed {
    background: #f0f9ff;
    border-left-color: #0ea5e9;
}

/* Results Section */
.results-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--gray-200);
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Result Cards */
.result-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
}

.result-card.highlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.result-label {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.result-description {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Calculation Summary */
.calculation-summary {
    background: var(--gray-50);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
}

.summary-row.total {
    border-top: 2px solid var(--gray-300);
    margin-top: 0.5rem;
    padding-top: 1rem;
    font-weight: 700;
}

.summary-value.positive {
    color: var(--success-color);
    font-weight: 600;
}

.summary-value.negative {
    color: var(--danger-color);
    font-weight: 600;
}

.divider {
    height: 1px;
    background: var(--gray-300);
    margin: 0.5rem 0;
}

/* Result Cards Grid */
.result-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

/* Comparison Box */
.comparison-box {
    background: #fff7ed;
    border: 1px solid #fdba74;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.small-text {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-top: 0.5rem;
}

/* Deducciones Section */
.deducciones-section {
    background: var(--gray-50);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
}

.deducciones-section h4 {
    margin-bottom: 1rem;
    color: var(--gray-800);
}

/* SEO Content */
.seo-content {
    max-width: 800px;
    margin: 0 auto;
}

.seo-content h2 {
    font-size: 1.75rem;
    color: var(--gray-900);
    margin: 2rem 0 1rem 0;
    border-bottom: 2px solid var(--gray-200);
    padding-bottom: 0.5rem;
}

.seo-content h3 {
    font-size: 1.375rem;
    color: var(--gray-800);
    margin: 1.5rem 0 0.75rem 0;
}

.seo-content p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.seo-content strong {
    color: var(--gray-900);
}

/* FAQ Section */
.faq-section {
    margin-top: 3rem;
}

.faq-item {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.faq-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

/* Related Tools */
.related-tools {
    margin-top: 3rem;
}

.related-tools h3 {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

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

.related-tool-card {
    display: block;
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    text-align: center;
}

.related-tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
    color: inherit;
}

.tool-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.5rem;
}

.tool-name {
    display: block;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.tool-description {
    display: block;
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* Spinner */
.spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s ease-in-out infinite;
    margin-right: 0.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .calculator-page {
        padding: 1rem;
    }
    
    .calculator-header h1 {
        font-size: 2rem;
    }
    
    .form-group-row {
        grid-template-columns: 1fr;
    }
    
    .result-cards-grid {
        grid-template-columns: 1fr;
    }
    
    .related-tools-grid {
        grid-template-columns: 1fr;
    }
    
    .calculator-container {
        padding: 1rem;
    }
}