:root {
    --primary: #2563eb;
    --text: #1f2937;
    --text-light: #6b7280;
    --bg: #ffffff;
    --bg-secondary: #f9fafb;
    --border: #e5e7eb;
    --code-bg: #1e293b;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
}

header {
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 100;
}

nav {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.nav-links a {
    margin-left: 2rem;
    color: var(--text);
    text-decoration: none;
    transition: color 0.2s;
}

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

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.post-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    transition: box-shadow 0.2s;
}

.post-card:hover {
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}

.post-card h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.post-card h2 a {
    color: var(--text);
    text-decoration: none;
}

.post-card h2 a:hover {
    color: var(--primary);
}

.post-meta {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: flex;
    gap: 1rem;
    align-items: center;
}

.tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    background: var(--bg-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.post-excerpt {
    color: var(--text-light);
    line-height: 1.7;
}

.post-full {
    max-width: 750px;
}

.post-header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.post-header h1 {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.post-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.post-content h2 {
    font-size: 1.75rem;
    margin: 2.5rem 0 1rem;
    color: var(--text);
}

.post-content h3 {
    font-size: 1.4rem;
    margin: 2rem 0 1rem;
}

.post-content p {
    margin-bottom: 1.5rem;
}

.post-content ul, .post-content ol {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.post-content li {
    margin-bottom: 0.5rem;
}

.post-content strong {
    font-weight: 600;
    color: var(--text);
}

.post-content code {
    background: var(--bg-secondary);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-size: 0.9em;
    font-family: 'Monaco', 'Courier New', monospace;
}

.post-content pre {
    background: var(--code-bg);
    color: #e2e8f0;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 2rem 0;
}

.post-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.post-content .math {
    overflow-x: auto;
    overflow-y: hidden;
}

.post-content blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 1.5rem;
    margin: 2rem 0;
    color: var(--text-light);
    font-style: italic;
}

footer {
    border-top: 1px solid var(--border);
    padding: 2rem;
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-top: 4rem;
}

@media (max-width: 768px) {
    nav {
        padding: 0 1rem;
    }
    
    main {
        padding: 2rem 1rem;
    }
    
    .post-header h1 {
        font-size: 2rem;
    }
    
    .post-content {
        font-size: 1rem;
    }
    
    .nav-links a {
        margin-left: 1rem;
    }
}