/* YOUR EXACT MAIN.CSS THEME VARIABLES */
:root {
    --blue: #2563eb;
    --white: #ffffff;
    --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;
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-tertiary: var(--gray-500);
    --border: var(--gray-200);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--white);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

/* YOUR EXACT BLOG SECTION STYLES */
.blog {
    padding: 80px 0;
    background: var(--white);
}

.blog-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.blog-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title-large {
    font-family: var(--font-sans);
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* ADDED: Category filter tags (new feature) */
.blog-filter {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.4rem 1rem;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text-secondary);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--blue);
    color: white;
    border-color: var(--blue);
}

/* YOUR EXACT BLOG GRID STYLES */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

/* YOUR EXACT BLOG CARD STYLES */
.blog-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    cursor: pointer;
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--blue);
}

/* ENHANCED: Featured post (new feature) */
.blog-card.featured {
    border: 2px solid var(--blue);
    position: relative;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.02) 0%, rgba(37, 99, 235, 0.01) 100%);
}

.featured-badge {
    position: absolute;
    top: -1px;
    right: -1px;
    background: var(--blue);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 0 14px 0 12px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

/* YOUR EXACT META STYLES */
.blog-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.blog-category {
    background: var(--blue);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* ENHANCED: Category colors (improvement) */
.category-fundamentals {
    background: #2563eb;
}

.category-optimization {
    background: #059669;
}

.category-performance {
    background: #dc2626;
}

.category-advanced {
    background: #7c3aed;
}

.blog-date {
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

/* YOUR EXACT TITLE STYLES */
.blog-title {
    font-family: var(--font-sans);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
    letter-spacing: -0.015em;
    line-height: 1.3;
}

.blog-excerpt {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

/* YOUR EXACT STATS STYLES */
.blog-stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.stat-item {
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

/* YOUR EXACT LINK STYLES */
.blog-link {
    color: var(--blue);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.2s ease;
}

.blog-link:hover {
    gap: 0.8rem;
}

/* YOUR EXACT CTA STYLES */
.blog-cta {
    text-align: center;
}

.btn-secondary {
    background: var(--white);
    color: var(--gray-700);
    border: 1px solid var(--border);
    padding: 0.8rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--blue);
    color: var(--blue);
}

/* YOUR EXACT RESPONSIVE STYLES */
@media (max-width: 1024px) {
    .blog-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    }
}

@media (max-width: 768px) {
    .section-title-large {
        font-size: 2rem;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .blog-container {
        padding: 0 1rem;
    }
    
    .section-title-large {
        font-size: 1.75rem;
    }
    
    .blog-card {
        padding: 1.5rem;
    }
    
    .blog-filter {
        gap: 0.25rem;
    }
    
    .filter-btn {
        font-size: 0.8rem;
        padding: 0.3rem 0.8rem;
    }
}

/* Accessibility */
.blog-card:focus,
.blog-link:focus,
.filter-btn:focus,
.btn-secondary:focus {
    outline: 2px solid var(--blue);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}