:root {
  --color-background: #0f172a;
  --color-text: #e5e7eb;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-link: #3b82f6;
  --color-link-hover: #2563eb;
  --border-radius: 5px;
  --spacing: 1rem;
  --line-height: 1.6;
  --font-family: system-ui, sans-serif;
}

body {
  font-family: var(--font-family);
  background: var(--color-background);
  color: var(--color-text);
  line-height: var(--line-height);
  margin: 0;
  padding: 0;
}

.tabs {
  display: flex;
  gap: var(--spacing);
  margin: var(--spacing) 0;
}

.tab-btn {
  padding: 0.5rem 1rem;
  cursor: pointer;
  background: var(--color-primary);
  color: var(--color-text);
  border: none;
  border-radius: var(--border-radius);
  transition: background 0.2s ease;
}

.tab-btn:hover {
  background: var(--color-primary-hover);
}

.tab-content article {
  margin-bottom: 1.5rem;
}

.tab-content a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.2s ease;
}

.tab-content a:hover {
  color: var(--color-link-hover);
}

ul {
  list-style-type: none;
  padding-left: 0;
}