:root {
  --maxw: 42rem;
  --fg: #111;
  --muted: #666;
  --bg: #fff;
  --link: #0366d6;
  --border: #e5e5e5;
  --codebg: #f6f8fa;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
}

.site-header {
  max-width: var(--maxw);
  margin: 1.5rem auto 0;
  padding: 0 1rem 0.75rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  font-weight: 700;
  text-decoration: none;
  color: var(--fg);
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 0.75rem;
}
.site-nav a:hover { color: var(--fg); }

.content {
  max-width: var(--maxw);
  margin: 1.25rem auto 2rem;
  padding: 0 1rem;
}

.site-footer {
  max-width: var(--maxw);
  margin: 2rem auto 1.5rem;
  padding: 0 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

a { color: var(--link); }
a:hover { text-decoration: underline; }

.linklist { padding-left: 1.1rem; }

pre, code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
               "Liberation Mono", "Courier New", monospace;
}

code {
  background: var(--codebg);
  padding: 0.1rem 0.3rem;
  border-radius: 6px;
}

pre {
  background: var(--codebg);
  padding: 0.9rem;
  border-radius: 10px;
  overflow: auto;
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
}

@media (max-width: 520px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    margin-top: 1rem;
    padding-bottom: 0.6rem;
  }

  .site-nav {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem 0.9rem;
  }

  .site-nav a {
    margin-left: 0;
  }
}