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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: #2c3e50;
    background-color: #f8f9fa;
    font-size: 17px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: #ffffff;
    border-bottom: 1px solid #e1e4e8;
    padding: 40px 0;
    margin-bottom: 50px;
}

.site-title {
    font-size: 32px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.site-tagline {
    font-size: 16px;
    color: #6a737d;
    font-weight: 400;
}

/* Main Content */
main {
    padding-bottom: 80px;
}

.intro {
    margin-bottom: 60px;
}

.intro h2 {
    font-size: 28px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 20px;
}

.intro p {
    margin-bottom: 16px;
    color: #24292e;
}

/* Content Sections */
.content-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.section-card {
    background-color: #ffffff;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    padding: 24px;
}

.section-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.section-card > p {
    font-size: 14px;
    color: #6a737d;
    margin-bottom: 16px;
}

.section-card ul {
    list-style: none;
}

.section-card li {
    margin-bottom: 10px;
}

.section-card a {
    color: #0366d6;
    text-decoration: none;
    font-size: 15px;
}

.section-card a:hover {
    text-decoration: underline;
}

/* Article Styles */
article {
    background-color: #ffffff;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    padding: 50px;
    margin-bottom: 40px;
}

article h1 {
    font-size: 36px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 10px;
    line-height: 1.3;
}

article .meta {
    color: #6a737d;
    font-size: 14px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #e1e4e8;
}

article h2 {
    font-size: 24px;
    font-weight: 600;
    color: #1a1a1a;
    margin-top: 40px;
    margin-bottom: 16px;
}

article h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a1a;
    margin-top: 30px;
    margin-bottom: 12px;
}

article p {
    margin-bottom: 20px;
    color: #24292e;
}

article ul, article ol {
    margin-bottom: 20px;
    margin-left: 30px;
}

article li {
    margin-bottom: 10px;
}

article a {
    color: #0366d6;
    text-decoration: none;
}

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

article blockquote {
    border-left: 3px solid #dfe2e5;
    padding-left: 20px;
    margin: 20px 0;
    color: #6a737d;
    font-style: italic;
}

article strong {
    font-weight: 600;
    color: #1a1a1a;
}

article em {
    font-style: italic;
}

/* Navigation */
.breadcrumb {
    margin-bottom: 30px;
    font-size: 14px;
}

.breadcrumb a {
    color: #0366d6;
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb span {
    color: #6a737d;
    margin: 0 8px;
}

/* Footer */
footer {
    background-color: #ffffff;
    border-top: 1px solid #e1e4e8;
    padding: 30px 0;
    margin-top: 60px;
}

footer p {
    color: #6a737d;
    font-size: 14px;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    article {
        padding: 30px 20px;
    }
    
    article h1 {
        font-size: 28px;
    }
    
    .content-sections {
        grid-template-columns: 1fr;
    }
}