/* 読みやすさだけを目的にした最小限のスタイル。装飾は足さない */
:root {
  --text: #1a1a1a;
  --muted: #666;
  --line: #e5e5e5;
  --link: #0b5fa5;
  --bg: #fff;
}
@media (prefers-color-scheme: dark) {
  :root { --text: #e8e8e8; --muted: #a0a0a0; --line: #333; --link: #7ab8f5; --bg: #16181a; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.9;
  font-size: 17px;
}
a { color: var(--link); }
.site-header, .site-footer {
  max-width: 720px; margin: 0 auto; padding: 20px 20px;
}
.site-header { display: flex; flex-wrap: wrap; gap: 12px 20px; align-items: baseline; border-bottom: 1px solid var(--line); }
.site-title { font-weight: 700; font-size: 18px; text-decoration: none; color: var(--text); }
.site-header nav a, .site-footer nav a { margin-right: 16px; font-size: 14px; }
main { max-width: 720px; margin: 0 auto; padding: 8px 20px 48px; }
h1 { font-size: 26px; line-height: 1.5; margin: 24px 0 8px; }
h2 { font-size: 21px; margin: 40px 0 12px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 18px; margin: 28px 0 8px; }
p, li { overflow-wrap: anywhere; }
ul { padding-left: 1.4em; }
li { margin: 6px 0; }
.date { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
.article-list { list-style: none; padding: 0; }
.article-list li { margin: 20px 0; }
.article-list a { font-size: 18px; font-weight: 600; }
.article-list span { display: block; color: var(--muted); font-size: 14px; margin-top: 4px; }
.site-footer { border-top: 1px solid var(--line); border-bottom: none; margin-top: 32px; }
.site-footer .note { color: var(--muted); font-size: 13px; margin-top: 12px; }