:root {
    --color-bg-default: #ffffff;
    --color-bg-secondary: #f6f8fa;
    --color-border: #d0d7de;
    --color-text-primary: #24292f;
    --color-text-secondary: #57606a;
    --color-accent: #0969da;
    --color-accent-hover: #1b1f23;
    --shadow-small: 0 1px 3px rgba(27,31,36,0.04);
    --shadow-medium: 0 3px 6px rgba(27,31,36,0.04);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    line-height: 1.5;
    color: var(--color-text-primary);
    background-color: var(--color-bg-default);
}

.nav {
    background-color: var(--color-bg-default);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--color-accent);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

.article-header {
    text-align: center;
    padding: 64px 0;
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
}

.article-category {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-accent);
    color: white;
    border-radius: 16px;
    font-size: 14px;
    margin-bottom: 16px;
}

.article-title {
    font-size: 36px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text-primary);
}

.article-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    color: var(--color-text-secondary);
    font-size: 14px;
}

.article-date {
    display: flex;
    align-items: center;
    gap: 4px;
}

.article-views {
    display: flex;
    align-items: center;
    gap: 4px;
}

.article-content {
    padding: 48px 0;
}

.article-content p {
    margin-bottom: 24px;
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text-primary);
}

.article-content h2 {
    font-size: 24px;
    font-weight: 600;
    margin: 48px 0 24px;
    color: var(--color-text-primary);
}

.article-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 32px 0 16px;
    color: var(--color-text-primary);
}

.article-content ul, .article-content ol {
    margin: 24px 0;
    padding-left: 24px;
}

.article-content li {
    margin-bottom: 12px;
    color: var(--color-text-primary);
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 24px 0;
}

.article-content code {
    background: var(--color-bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 14px;
}

.article-content pre {
    background: var(--color-bg-secondary);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 24px 0;
}

.article-content pre code {
    background: none;
    padding: 0;
}

.article-content blockquote {
    border-left: 4px solid var(--color-accent);
    padding-left: 16px;
    margin: 24px 0;
    color: var(--color-text-secondary);
}

.article-footer {
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
    margin-top: 48px;
}

.article-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.article-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    border-radius: 16px;
    font-size: 12px;
    text-decoration: none;
}

.article-tag:hover {
    background: var(--color-accent);
    color: white;
}

.article-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 32px;
}

.article-nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.article-nav-link:hover {
    color: var(--color-accent);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .article-header {
        padding: 32px 0;
    }
    
    .article-title {
        font-size: 28px;
    }
    
    .article-content {
        padding: 32px 0;
    }
    
    .article-content h2 {
        font-size: 20px;
    }
    
    .article-content h3 {
        font-size: 18px;
    }
}