body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f7f7f7;
  color: #333;
}

header {
  background-color: #1e1e2f;
  color: white;
  padding: 1em;
  text-align: center;
}

nav {
  text-align: center;
  margin: 1em 0;
}

.section-btn, .subsection-btn {
  margin: 0.3em;
  padding: 0.6em 1.2em;
  border: none;
  border-radius: 8px;
  background-color: #4a4a6a;
  color: white;
  cursor: pointer;
}

.section-btn:hover, .subsection-btn:hover {
  background-color: #6a6a8a;
}

#subsections, #posts {
  padding: 1em;
  max-width: 800px;
  margin: auto;
}

.post-summary {
  background-color: white;
  margin: 1em 0;
  padding: 1em;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.post-summary:hover {
  background-color: #f0f0f0;
}

.post-full {
  background-color: white;
  padding: 2em;
  border-radius: 8px;
  margin-top: 1em;
  box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}