/* CSS Reset & Base */
* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    line-height: 1.6;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--theme-background);
    color: var(--theme-text);
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* Layout System */
.blog-layout {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.blog-post {
    background: var(--theme-content-bg);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 2px 8px var(--theme-shadow);
}

/* Typography */
.blog-post-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin: 0 0 1rem 0;
    color: var(--theme-primary);
}

.blog-post-content {
    font-size: 1.125rem;
    line-height: 1.8;
}

.blog-post-content h1,
.blog-post-content h2,
.blog-post-content h3 {
    margin: 2rem 0 1rem 0;
    font-weight: 600;
    color: var(--theme-heading);
}

.blog-post-content h2 {
    font-size: 1.875rem;
}

.blog-post-content h3 {
    font-size: 1.5rem;
}

.blog-post-content p {
    margin: 1rem 0;
}

.blog-post-content a {
    color: var(--theme-link);
    text-decoration: none;
}

.blog-post-content a:hover {
    text-decoration: underline;
}

.blog-post-content code {
    background: var(--theme-code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
    font-size: 0.875em;
}

.blog-post-content pre {
    background: var(--theme-code-bg);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
}

.blog-post-content blockquote {
    border-left: 4px solid var(--theme-primary);
    margin: 1.5rem 0;
    padding: 0.5rem 1.5rem;
    background: var(--theme-quote-bg);
    font-style: italic;
}

/* Content Elements */
.blog-post-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--theme-border);
}

.blog-post-meta {
    font-size: 0.875rem;
    color: var(--theme-muted);
    margin: 0.5rem 0;
}

/* Table of Contents */
.blog-toc {
    background: var(--theme-toc-bg);
    border: 1px solid var(--theme-border);
    border-radius: 8px;
    padding: 1rem;
    margin: 2rem 0;
}

.blog-toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.blog-toc-link {
    display: block;
    padding: 0.5rem 0;
    color: var(--theme-link);
    text-decoration: none;
    font-weight: 500;
}

.blog-toc-link:hover,
.blog-toc-active {
    color: var(--theme-primary);
    text-decoration: underline;
}

.blog-toc-h3 {
    padding-left: 1.5rem;
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .blog-layout {
        padding: 1rem 0.5rem;
    }
    
    .blog-post {
        padding: 1.5rem;
    }
    
    .blog-post-title {
        font-size: 2rem;
    }
    
    .blog-post-content {
        font-size: 1rem;
    }
}