:root {
  --max: 68ch;
  --side: 280px;
  --gap: 2rem;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font: 16px/1.8 system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: #111;
  background: #fff;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  height: auto;
}

pre {
  overflow: auto;
  padding: 1rem;
  background: #f7f7f7;
  border-radius: 6px;
}

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

.site-title {
  margin-top: 0;
}

.article-list-item {
  padding: 1rem 0;
  border-bottom: 1px solid #e6e6e6;
}

.article-meta {
  color: #666;
  font-size: .9rem;
  margin: .25rem 0 .5rem;
}

.tags a {
  font-size: .9rem;
  margin-right: .5rem;
  text-decoration: none;
  opacity: .88;
}

.tags a:hover {
  text-decoration: underline;
}

.thumb img {
  width: 100%;
  max-width: 480px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  display: block;
  margin: 0 auto;
}

.article-shell {
  max-width: calc(var(--max) + var(--side) + var(--gap));
  margin: 0 auto;
  padding: 1rem;
}

.article-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}

@media (min-width: 1024px) {
  .article-wrap {
    grid-template-columns: var(--side) minmax(0, var(--max));
    align-items: start;
  }

  nav.toc {
    position: sticky;
    top: 1rem;
    max-height: calc(100vh - 2rem);
    overflow: auto;
  }
}

nav.toc {
  font-size: .9rem;
  background: #fafafa;
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 1rem;
}

nav.toc h2 {
  margin: .2rem 0 .6rem;
  font-size: 1rem;
}

nav.toc ol {
  list-style: none;
  padding-left: .5rem;
  margin: 0;
}

nav.toc li {
  margin: .25rem 0;
}

nav.toc a {
  text-decoration: none;
}

nav.toc a:hover {
  text-decoration: underline;
}

nav.toc .depth-2 {
  margin-left: 1rem;
  font-size: .95em;
  opacity: .9;
}

nav.toc .active {
  font-weight: 600;
  text-decoration: underline;
}

.post {
  background: #fff;
  padding: 1rem;
  border-radius: 12px;
}

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid #eee;
}

.post-nav-next {
  margin-left: auto;
  text-align: right;
}

.related {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #eee;
}

@media (prefers-color-scheme: dark) {
  body {
    background: #0e0f11;
    color: #e8e9ea;
  }

  .article-list-item,
  .post-nav,
  .related {
    border-color: #262a30;
  }

  nav.toc {
    background: #15171a;
    border-color: #262a30;
  }

  pre {
    background: #15171a;
  }

  .post {
    background: #0f1115;
  }
}