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

:root {
    /* AI-themed color palette */
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --background: #ffffff;
    --surface: #f9fafb;
    --border: #e5e7eb;
    --code-bg: #1e293b;
    --code-text: #e2e8f0;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Monaco', 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* 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);
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    background-color: var(--background);
    line-height: 1.7;
    font-size: 16px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header & Navigation */
.site-header {
    background: var(--background);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s;
    padding: 0.5rem 0;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

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

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    border: 2px solid transparent;
}

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

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

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

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

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

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

.btn-link {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
}

.btn-link:hover {
    text-decoration: underline;
}

/* Featured Posts Section */
.featured-posts {
    padding: var(--spacing-2xl) 0;
    background: var(--background);
}

.featured-posts h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    color: var(--text-primary);
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.post-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all 0.2s;
}

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

.post-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.post-card h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
    line-height: 1.4;
}

.post-card h3 a {
    color: var(--text-primary);
    text-decoration: none;
}

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

.post-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.post-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.view-all {
    text-align: center;
}

/* About Preview Section */
.about-preview {
    padding: var(--spacing-2xl) 0;
    background: var(--surface);
}

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

.about-content h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.about-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

/* Blog Page Specific */
.page-header {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    font-size: 1.125rem;
    opacity: 0.9;
}

.blog-list {
    padding: var(--spacing-2xl) 0;
}

.blog-post-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    transition: all 0.2s;
}

.blog-post-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

/* Article Styles */
article.post-content {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-md);
}

article.post-content h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

article.post-content h2 {
    font-size: 2rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

article.post-content h3 {
    font-size: 1.5rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

article.post-content p {
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-primary);
}

article.post-content ul,
article.post-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

article.post-content li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

article.post-content code {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.9em;
}

article.post-content pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

article.post-content pre code {
    background: transparent;
    padding: 0;
}

article.post-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    color: var(--text-secondary);
    font-style: italic;
}

.article-meta {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.article-meta .post-meta {
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

/* Footer */
.site-footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer-content {
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.footer-links a {
    color: white;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .nav-links {
        gap: var(--spacing-md);
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
    
    article.post-content h1 {
        font-size: 2rem;
    }
    
    article.post-content h2 {
        font-size: 1.5rem;
    }
    
    article.post-content p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .nav-links {
        display: none;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
}