:root {
  --bg: #ffffff;
  --text: #111111;
  --card: #f5f5f5;
  --accent: #0066cc;
  --border: #ddd;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --text: #f5f5f5;
    --card: #1e1e1e;
    --accent: #3399ff;
    --border: #333;
  }
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background-color: var(--bg);
  color: var(--text);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

header, footer {
  background-color: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 20px;
}

footer {
  border-top: 1px solid var(--border);
  text-align: center;
}

.container {
  display: flex;
  flex-wrap: wrap;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
  gap: 20px;
}

main {
  flex: 3;
  min-width: 0;
}

aside {
  flex: 1;
  min-width: 250px;
  border-left: 1px solid var(--border);
  padding-left: 20px;
}

.blog-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.blog-card h2 {
  margin-top: 0;
}

.blog-card h2 a {
  color: var(--accent);
  text-decoration: none;
}

.blog-card p {
  margin-top: 10px;
  line-height: 1.6;
}

article {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  line-height: 1.7;
}

.sidebar-section {
  margin-bottom: 30px;
}

.sidebar-section h3 {
  border-bottom: 1px solid var(--border);
  padding-bottom: 5px;
  margin-bottom: 10px;
}

.sidebar-section ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

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

.sidebar-section a {
  color: var(--accent);
  font-weight: 500;
}

@media screen and (max-width: 768px) {
  .container {
    flex-direction: column;
  }

  aside {
    border-left: none;
    padding-left: 0;
    margin-top: 30px;
  }
}