/* u-labo.org/md サイト共通スタイル。lib/lobster.css（lobster.js 標準）の上書きと、目次付きレイアウト */

:root {
  --lbs-font: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic Medium", "Yu Gothic", Meiryo, system-ui, sans-serif;
}

/* 引用が薄く見えすぎないよう、文字色を少し濃くする */
.lbs-blockquote {
  color: #4b5563;
}

/* ---- 本文 + 右側の目次 ---- */
.page-layout {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}
.main-content {
  flex: 1;
  min-width: 0;
}
.toc-pane {
  width: 220px;
  flex-shrink: 0;
  position: sticky;
  top: 1.5rem;
  font-size: 0.85rem;
  border-left: 1px solid #e0e0e0;
  padding-left: 1rem;
}
.toc-pane .toc-title {
  font-weight: bold;
  font-size: 0.8rem;
  text-transform: uppercase;
  color: #888;
  margin-bottom: 0.5rem;
}
.toc-pane ul {
  list-style: none;
  margin: 0;
  padding-left: 0;
}
.toc-pane li {
  margin: 0.3rem 0;
}
.toc-pane a {
  text-decoration: none;
  color: inherit;
}
.toc-pane a:hover {
  text-decoration: underline;
}
.toc-level-3 { padding-left: 0.8rem; }
.toc-level-4 { padding-left: 1.6rem; }

@media (max-width: 1024px) {
  .toc-pane { display: none; }
  .page-layout { display: block; }
}

/* ---- スマホ幅: 余白を詰めて本文幅を確保し、長いタイトルの折り返しを減らす ---- */
@media (max-width: 640px) {
  body { margin: 0; }
  .page-layout { padding: 0; }
  #content { padding: 1.25rem 1rem; }
  .lbs-heading-1 { font-size: 1.6em; }
}

/* ---- Mermaid ---- */
.mermaid {
  display: flex;
  justify-content: center;
}