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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
  color: #24292e;
  background-color: #f8f9fa;
  padding: 20px;
}

/* Navigation */
nav {
  max-width: 760px;
  margin: 0 auto 24px auto;
}

nav a {
  color: #0969da;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

nav a:hover {
  text-decoration: underline;
  color: #044289;
}

/* Article Container */
.article-container {
  max-width: 760px;
  margin: 0 auto;
  background: #ffffff;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

/* Header Section */
.article-header {
  border-bottom: 1px solid #e1e4e8;
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.article-date {
  font-size: 0.875rem;
  color: #57606a;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.article-header h1 {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  color: #0f1419;
  margin-bottom: 12px;
}

.article-subtitle {
  font-size: 1.2rem;
  color: #57606a;
  font-weight: 400;
  line-height: 1.4;
}

/* Article Content Body */
.article-content p {
  font-size: 1.1rem;
  color: #24292e;
  margin-bottom: 20px;
  line-height: 1.8;
}

.article-content h2 {
  font-size: 1.5rem;
  margin-top: 36px;
  margin-bottom: 16px;
  color: #0f1419;
}

.article-content blockquote {
  border-left: 4px solid #0969da;
  padding-left: 16px;
  margin: 24px 0;
  font-style: italic;
  color: #57606a;
}

/* Responsive Design */
@media (max-width: 600px) {
  body {
    padding: 12px;
  }
  
  .article-container {
    padding: 20px;
  }

  .article-header h1 {
    font-size: 1.75rem;
  }

  .article-subtitle {
    font-size: 1rem;
  }
}