:root {
  --bg: #f6f5f1;
  --fg: #222;
  --muted: #666;
  --border: #d8d6cf;
  --link: #1a5fb4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --fg: #e6e6e6;
    --muted: #a0a0a0;
    --border: #3a3a3d;
    --link: #78aeed;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  line-height: 1.8;
}

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

/* トップページ: 一語だけを中央に置く */
.home {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.home h1 {
  margin: 0;
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 300;
  letter-spacing: 0.08em;
}

/* 文書ページ */
main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2.5rem 1rem 4rem;
}

main h1 { font-size: 1.6rem; margin: 0 0 1.5rem; }
main h2 { font-size: 1.2rem; margin: 2rem 0 0.5rem; }

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  word-break: break-all;
}

ul { padding-left: 1.5rem; }