/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #0ea5e9;
    --accent-color: #06b6d4;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --background: #ffffff;
    --surface: #f8fafc;
    --border: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --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);
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.header {
    background: var(--background);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.25rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    margin-right: 0.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--surface) 0%, var(--background) 100%);
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Calculator */
.calculator-container {
    max-width: 600px;
    margin: 0 auto;
}

.calculator-card {
    background: var(--background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    border: 1px solid var(--border);
}

.calculator-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--text-primary);
}

.calculator-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.input-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.input-field {
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.2s;
}

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

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

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: #0284c7;
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* Results */
.results-container {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.results-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--text-primary);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.result-item {
    text-align: center;
    padding: 1rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
}

.result-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.result-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.detailed-results {
    background: var(--surface);
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
}

.detailed-result {
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.detailed-result:last-child {
    margin-bottom: 0;
}

.result-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* Info Section */
.info-section {
    padding: 4rem 0;
    background: var(--surface);
}

.info-section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.info-section > .container > p {
    font-size: 1.125rem;
    text-align: center;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto 3rem;
}

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

.info-card {
    background: var(--background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.info-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.info-card p {
    color: var(--text-secondary);
}

/* How It Works */
.how-it-works {
    padding: 4rem 0;
}

.how-it-works h2 {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

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

.step {
    text-align: center;
    padding: 2rem;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.step p {
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #d1d5db;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 1rem;
    text-align: center;
    color: #9ca3af;
}

/* Mobile Navigation */
.nav-menu.active {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--background);
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--border);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    width: 16px;
    height: 16px;
    margin-left: 8px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: inline-block;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-container {
    animation: fadeInUp 0.5s ease-out;
}

/* Focus States for Accessibility */
.btn:focus,
.input-field:focus,
.nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border: #000000;
        --text-secondary: #000000;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .result-actions {
        display: none;
    }
    
    .calculator-card {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .calculator-card {
        padding: 1.5rem;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.5rem;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .calculator-card {
        padding: 1rem;
    }
    
    .info-section,
    .how-it-works {
        padding: 2rem 0;
    }
}
/* FAQ
 Styles */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: var(--background);
    border: none;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color 0.2s;
    position: relative;
}

.faq-question:hover {
    background: var(--surface);
}

.faq-question::after {
    content: '+';
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    font-weight: 300;
    transition: transform 0.2s;
}

.faq-item.active .faq-question::after {
    transform: translateY(-50%) rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    background: var(--surface);
    opacity: 0;
    transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    opacity: 1;
    overflow: visible;
}

.faq-answer p {
    padding: 1.5rem;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Active navigation link */
.nav-link.active {
    color: var(--primary-color);
    font-weight: 600;
}

/* Page-specific styles */
.page-header {
    background: var(--surface);
    padding: 2rem 0;
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.content-section {
    padding: 3rem 0;
}

.content-section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.content-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.content-section p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.content-section ul,
.content-section ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
    color: var(--text-secondary);
}

.content-section li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* Blog styles */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.blog-card {
    background: var(--background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.blog-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.blog-card-content {
    padding: 1.5rem;
}

.blog-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.blog-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.blog-card-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.read-more:hover {
    color: #1d4ed8;
}

/* Comparison table styles */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: var(--background);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

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

.comparison-table th {
    background: var(--surface);
    font-weight: 600;
    color: var(--text-primary);
}

.comparison-table td {
    color: var(--text-secondary);
}

.comparison-table tr:last-child td {
    border-bottom: none;
}