/* CSS Variables and Base Styles */
:root {
    /* Brand Colors */
    --primary-color: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    
    /* Secondary Colors */
    --success-color: #059669;
    --warning-color: #d97706;
    --error-color: #dc2626;
    
    /* Neutral Colors */
    --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;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    
    /* Spacing Scale - Enhanced for mobile */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    
    /* Mobile-specific spacing */
    --mobile-section-padding: 2.5rem;
    --mobile-container-padding: 1rem;
    --mobile-element-spacing: 0.75rem;
    
    /* Border Radius */
    --rounded-sm: 0.25rem;
    --rounded-md: 0.375rem;
    --rounded-lg: 0.5rem;
    --rounded-xl: 0.75rem;
    --rounded-2xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
}

/* CSS Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

h4 {
    font-size: 1.25rem;
    font-weight: 600;
}

p {
    margin-bottom: var(--space-4);
    color: var(--gray-700);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Layout Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-top: var(--space-2);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border: 2px solid transparent;
    border-radius: var(--rounded-lg);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--gray-700);
    border-color: var(--gray-300);
}

.btn-secondary:hover {
    background-color: var(--gray-100);
    color: var(--gray-800);
}

/* Header */
/* Old header styles removed - now using site-header.css */

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--space-16) 0;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--space-6);
    color: white;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--space-8);
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.feature {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    background: rgba(255, 255, 255, 0.1);
    padding: var(--space-4);
    border-radius: var(--rounded-lg);
    backdrop-filter: blur(10px);
}

.feature-icon {
    font-size: 1.5rem;
}

.feature-text {
    font-weight: 600;
}

/* How It Works Section */
.how-to-section {
    padding: var(--space-16) 0;
    background-color: white;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.step-card {
    text-align: center;
    padding: var(--space-6);
    border-radius: var(--rounded-xl);
    background-color: var(--gray-50);
    transition: transform var(--transition-base);
}

.step-card:hover {
    transform: translateY(-2px);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.step-content h3 {
    margin-bottom: var(--space-3);
    color: var(--gray-900);
}

.step-content p {
    color: var(--gray-600);
    margin-bottom: 0;
}

/* Features Section */
.features-section {
    padding: var(--space-16) 0;
    background-color: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.feature-card {
    background-color: white;
    padding: var(--space-8);
    border-radius: var(--rounded-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.feature-icon-large {
    font-size: 3rem;
    margin-bottom: var(--space-4);
}

.feature-card h3 {
    margin-bottom: var(--space-3);
    color: var(--gray-900);
}

.feature-card p {
    color: var(--gray-600);
    margin-bottom: 0;
}

/* FAQ Section */
.faq-section {
    padding: var(--space-16) 0;
    background-color: white;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.faq-item {
    padding: var(--space-6);
    border-radius: var(--rounded-lg);
    background-color: var(--gray-50);
}

.faq-item h3 {
    color: var(--gray-900);
    margin-bottom: var(--space-3);
    font-size: 1.125rem;
}

.faq-item p {
    color: var(--gray-700);
    margin-bottom: 0;
    line-height: 1.7;
}

/* Footer */
.site-footer {
    background-color: var(--gray-900);
    color: white;
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

.footer-section h3,
.footer-section h4 {
    color: white;
    margin-bottom: var(--space-4);
}

.footer-section p {
    color: var(--gray-400);
}

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

.footer-section ul li {
    margin-bottom: var(--space-2);
}

.footer-section ul a {
    color: var(--gray-400);
    transition: color var(--transition-base);
}

.footer-section ul a:hover {
    color: white;
    text-decoration: none;
}

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: var(--space-8);
}

.disclaimer-notice {
    background-color: var(--gray-800);
    padding: var(--space-4);
    border-radius: var(--rounded-lg);
    margin-bottom: var(--space-4);
}

.disclaimer-notice p {
    color: var(--gray-300);
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.6;
}

.copyright {
    text-align: center;
}

.copyright p {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin: 0;
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-in {
    animation: slideIn 0.6s ease-out;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mt-4 {
    margin-top: var(--space-4);
}

.mb-4 {
    margin-bottom: var(--space-4);
}

.mt-8 {
    margin-top: var(--space-8);
}

.mb-8 {
    margin-bottom: var(--space-8);
}

.hidden {
    display: none;
}

.visible {
    display: block;
}

/* Focus Styles for Accessibility */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

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

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Blog Section Styles */
.blog-section {
    background: var(--gray-50);
    padding: var(--space-16) 0;
}

.blog-highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.blog-highlight-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-200);
}

.blog-highlight-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.blog-highlight-card.featured {
    border: 2px solid var(--primary-color);
    position: relative;
}

.blog-highlight-card.featured::before {
    content: '⭐ Featured';
    position: absolute;
    top: -10px;
    left: 20px;
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius);
    font-size: 0.75rem;
    font-weight: 600;
}

.blog-card-header {
    margin-bottom: var(--space-4);
}

.blog-card-header .category {
    display: inline-block;
    padding: 4px 8px;
    border-radius: var(--radius);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: var(--space-2);
}

.category.how-to {
    background: #dbeafe;
    color: #1e40af;
}

.category.strategies {
    background: #d1fae5;
    color: #065f46;
}

.category.case-study {
    background: #fef3c7;
    color: #92400e;
}

.category.news {
    background: #fce7f3;
    color: #be185d;
}

.blog-card-header h3 {
    margin: 0;
    font-size: 1.125rem;
    line-height: 1.4;
}

.blog-card-header h3 a {
    color: var(--gray-900);
    text-decoration: none;
    transition: color 0.2s ease;
}

.blog-card-header h3 a:hover {
    color: var(--primary-color);
}

.blog-highlight-card p {
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.blog-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-4);
    border-top: 1px solid var(--gray-100);
}

.read-time {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

.read-more:hover {
    color: var(--primary-dark);
}

.blog-cta {
    text-align: center;
}

/* Enhanced Mobile Typography and Spacing */
@media (max-width: 768px) {
    /* Improved line heights for readability */
    body {
        line-height: 1.6;
        font-size: 0.95rem;
    }
    
    /* Optimized heading hierarchy */
    h1, .hero-title {
        line-height: 1.2;
        letter-spacing: -0.01em;
        margin-bottom: var(--space-4);
    }
    
    h2 {
        line-height: 1.3;
        letter-spacing: -0.005em;
        margin-bottom: var(--space-3);
    }
    
    h3 {
        line-height: 1.4;
        margin-bottom: var(--space-3);
    }
    
    h4, h5, h6 {
        line-height: 1.5;
        margin-bottom: var(--space-2);
    }
    
    /* Improved paragraph spacing */
    p {
        margin-bottom: var(--space-3);
        line-height: 1.6;
        max-width: none;
    }
    
    /* Link improvements */
    a {
        touch-action: manipulation;
        text-decoration-thickness: 1px;
        text-underline-offset: 2px;
    }
    
    a:hover {
        text-decoration-thickness: 2px;
    }
    
    /* Section spacing optimization */
    .hero {
        padding: var(--space-10) 0;
        text-align: center;
    }
    
    .hero-content {
        padding: 0 var(--space-2);
    }
    
    .hero-subtitle {
        margin-bottom: var(--space-6);
        max-width: none;
    }
    
    /* How-to section mobile improvements */
    .how-to-section {
        padding: var(--space-12) 0;
    }
    
    .section-header {
        margin-bottom: var(--space-8);
        padding: 0 var(--space-2);
    }
    
    .section-subtitle {
        font-size: 1rem;
        line-height: 1.5;
    }
    
    /* Features section mobile */
    .features-section {
        padding: var(--space-12) 0;
    }
    
    /* FAQ section mobile */
    .faq-section {
        padding: var(--space-12) 0;
    }
    
    /* Professional standards mobile */
    .professional-standards {
        padding: var(--space-12) 0;
    }
    
    /* Blog section adjustments */
    .blog-section {
        padding: var(--space-12) 0;
    }
    
    .blog-highlights-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .blog-highlight-card {
        padding: var(--space-4);
    }
    
    .blog-card-header h3 {
        font-size: 1rem;
        line-height: 1.4;
        margin-bottom: var(--space-2);
    }
    
    .blog-highlight-card p {
        font-size: 0.875rem;
        line-height: 1.5;
        margin-bottom: var(--space-3);
    }
    
    /* Container improvements */
    .container {
        padding: 0 var(--space-4);
    }
}

/* Professional Standards Section */
.professional-standards {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    padding: var(--space-20) 0;
    border-top: 1px solid var(--gray-200);
}

.standards-content h2 {
    text-align: center;
    color: var(--gray-900);
    margin-bottom: var(--space-12);
    font-size: 2.25rem;
    font-weight: 700;
}

.standards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-10);
}

.standard-item {
    background: white;
    padding: var(--space-8);
    border-radius: var(--rounded-xl);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    text-align: center;
    border: 1px solid var(--gray-100);
    transition: all var(--transition-base);
}

.standard-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -3px rgb(0 0 0 / 0.1);
}

.standard-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
    display: block;
}

.standard-item h4 {
    color: var(--gray-900);
    margin-bottom: var(--space-3);
    font-size: 1.25rem;
    font-weight: 600;
}

.standard-item p {
    color: var(--gray-600);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Additional mobile typography enhancements */
@media (max-width: 768px) {
    .standards-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .standard-item {
        padding: var(--space-4);
        text-align: left;
    }
    
    .standards-content h2 {
        font-size: 1.625rem;
        line-height: 1.3;
        text-align: center;
        margin-bottom: var(--space-8);
    }
    
    .standard-item h4 {
        font-size: 1.125rem;
        line-height: 1.4;
    }
    
    .standard-item p {
        font-size: 0.875rem;
        line-height: 1.6;
        margin: 0;
    }
    
    .standard-icon {
        font-size: 2rem;
        margin-bottom: var(--space-3);
        text-align: center;
        display: block;
    }
}

/* Extra small mobile typography */
@media (max-width: 480px) {
    body {
        font-size: 0.9rem;
        line-height: 1.7;
    }
    
    .container {
        padding: 0 var(--space-3);
    }
    
    .hero {
        padding: var(--space-8) 0;
    }
    
    .hero-title {
        font-size: 1.75rem;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 0.95rem;
        line-height: 1.6;
    }
    
    h2 {
        font-size: 1.375rem;
    }
    
    h3 {
        font-size: 1.125rem;
    }
    
    .section-header {
        margin-bottom: var(--space-6);
    }
    
    .section-subtitle {
        font-size: 0.95rem;
    }
    
    /* Improved spacing for very small screens */
    .how-to-section,
    .features-section,
    .faq-section,
    .professional-standards,
    .blog-section {
        padding: var(--space-10) 0;
    }
}