:root {
  --primary: #1f2937;
  --secondary: #3b82f6;
  --bg: #f9fafb;
  --text: #111827;
}

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

body {
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
  max-width: 900px;
  margin: auto;
  padding: 2rem;
}

header {
  display: flex;
  justify-content: center;
  padding-bottom: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid #ddd;
}

nav a {
  color: var(--primary);
  margin: 0 1rem;
  text-decoration: none;
  font-weight: 500;
}

nav a:hover {
  color: var(--secondary);
}

main h1, main h2, main h3 {
  margin-top: 1.5rem;
  color: var(--primary);
}

main p { margin-top: 1rem; }

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #ddd;
  text-align: center;
  font-size: 0.9rem;
  color: #6b7280;
}

.btn {
  display: inline-block;
  background: var(--secondary);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  margin-top: 1rem;
  text-decoration: none;
  font-weight: 500;
}

.btn:hover { background: #2563eb; }

.post-list { list-style: none; }
.post-list li { margin-bottom: 1.5rem; }
.post-list a { font-size: 1.2rem; color: var(--secondary); }
.post-list small { color: #6b7280; display: block; }