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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    padding: 20px;
}

img {
max-width: 1200px;
width: 100%;
height: auto;
border-radius: 16px;
display: block;
}

.author-badge {
    position: fixed;
    top: 20px;
    left: 20px;
    background: #3b82f6;
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 250px;
    gap: 30px;
    margin-top: 60px;
}

.loading {
    text-align: center;
    padding: 100px 20px;
    font-size: 1.2rem;
    color: #666;
}

.content {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    min-height: 600px;
}

.article-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 30px;
    line-height: 1.2;
    color: #2c3e50;
    text-align: center;
    padding-bottom: 20px;
    border-bottom: 3px solid #e2e8f0;
}

.article-content {
    font-size: 1.1rem;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
    margin: 24px 0 16px 0;
    font-weight: 600;
    line-height: 1.3;
    color: #2c3e50;
}

.article-content h1 {
    font-size: 2rem;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 12px;
}

.article-content h2 {
    font-size: 1.75rem;
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 8px;
}

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

.article-content h4 {
    font-size: 1.25rem;
}

.article-content p {
    margin-bottom: 16px;
    color: #4a5568;
}

.article-content ul,
.article-content ol {
    margin: 16px 0;
    padding-left: 30px;
}

.article-content li {
    margin-bottom: 8px;
    color: #4a5568;
}

.article-content code {
    background-color: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.95em;
}

.article-content pre {
    background-color: #1e293b;
    color: #f8fafc;
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
}

.article-content pre code {
    background: none;
    padding: 0;
    font-size: 0.95em;
}

.article-content blockquote {
    border-left: 4px solid #3b82f6;
    padding: 16px 0 16px 20px;
    margin: 20px 0;
    color: #4a5568;
    font-style: italic;
}

.article-content a {
    color: #3b82f6;
    text-decoration: none;
}

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

.toc-container {
    position: sticky;
    top: 20px;
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

.toc-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: #2c3e50;
    padding-bottom: 8px;
    border-bottom: 2px solid #e2e8f0;
}

.toc-list {
    list-style: none;
}

.toc-list li {
    margin-bottom: 8px;
}

.toc-list a {
    color: #4a5568;
    text-decoration: none;
    font-size: 0.95rem;
    display: block;
    padding: 4px 0;
    transition: color 0.2s ease;
}

.toc-list a:hover {
    color: #3b82f6;
    text-decoration: underline;
}

.toc-level-1 { padding-left: 0; }
.toc-level-2 { padding-left: 16px; }
.toc-level-3 { padding-left: 32px; }
.toc-level-4 { padding-left: 48px; }

@media (max-width: 768px) {
    .author-badge {
        top: 10px;
        left: 10px;
        padding: 6px 12px;
        font-size: 0.8rem;
    }
    
    .container {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 100px;
    }
    
    .toc-container {
        position: relative;
        top: 0;
    }
    
    .content {
        padding: 20px;
    }
    
    .article-title {
        font-size: 2rem;
    }
}