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

:root {
  --fg: #222;
  --bg: #fff;
  --accent: #555;
  --border: #ddd;
  --code-bg: #f5f5f5;
  --max-w: 800px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #ddd;
    --bg: #1a1a1a;
    --accent: #aaa;
    --border: #333;
    --code-bg: #252525;
  }
}

body {
  font-family: monospace;
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  max-width: calc(var(--max-w) + 200px);
  margin: 0 auto;
  padding: 2rem 1rem;
}

.page {
  display: flex;
  gap: 2rem;
}

main {
  max-width: var(--max-w);
  min-width: 0;
  flex: 1;
}

.toc {
  width: 180px;
  flex-shrink: 0;
  position: sticky;
  top: 2rem;
  align-self: flex-start;
  font-size: 0.8rem;
  line-height: 1.4;
}

.toc strong {
  display: block;
  margin-bottom: 0.5rem;
}

.toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc li {
  margin-bottom: 0.3rem;
}

.toc .toc-h3 {
  padding-left: 0.8rem;
}

.toc .toc-h4 {
  padding-left: 1.0rem;
}

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

.toc a:hover {
  color: var(--fg);
}

@media (max-width: 900px) {
  .toc {
    display: none;
  }

  body {
    max-width: var(--max-w);
  }
}

a {
  color: var(--fg);
}

a:hover {
  color: var(--accent);
}

nav {
  margin-bottom: 2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 1rem;
}

nav a {
  text-decoration: none;
}

h1, h2, h3 {
  font-weight: bold;
  margin: 1.5rem 0 0.5rem;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

.heading-link {
  margin-left: 0.4rem;
  color: var(--border);
  text-decoration: none;
  font-size: 0.75em;
  visibility: hidden;
}

h1:hover .heading-link,
h2:hover .heading-link,
h3:hover .heading-link,
h4:hover .heading-link {
  visibility: visible;
}

.heading-link:hover {
  color: var(--accent);
}

blockquote {
  border-left: 3px solid var(--border);
  padding-left: 1rem;
  margin: 1rem 0;
  color: var(--accent);
}

p, ul, ol {
  margin-bottom: 1rem;
}

ul, ol {
  padding-left: 1.5rem;
}

pre {
  background: var(--code-bg);
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
}

code {
  font-family: monospace;
  background: var(--code-bg);
  padding: 0.1rem 0.3rem;
}

pre code {
  background: none;
  padding: 0;
}

.post-list {
  list-style: none;
  padding: 0;
}

.post-list li {
  margin-bottom: 0.5rem;
}

.post-date {
  color: var(--accent);
  margin-right: 0.5rem;
}

.post-meta {
  color: var(--accent);
  margin-bottom: 1.5rem;
}

footer {
  margin-top: 3rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
  color: var(--accent);
  font-size: 0.85rem;
}