:root {
  --bg: #faf8f5; --fg: #2b2a28; --muted: #8a857d; --line: #e6e1d9; --accent: #3d6b7a; --card: #fff;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #1b1c1e; --fg: #e4e2de; --muted: #8f8b85; --line: #2f3033; --accent: #8fbccb; --card: #232427; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font-family: "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif; line-height: 1.9; }
a { color: var(--accent); text-decoration: none; }
header.site, footer.site, main { max-width: 720px; margin: 0 auto; padding: 0 16px; }
header.site { padding-top: 32px; padding-bottom: 24px; }
.brand { font-size: 1.4rem; font-weight: 700; color: var(--fg); letter-spacing: .05em; }
footer.site { color: var(--muted); font-size: .8rem; padding: 48px 16px 32px; }
.cats { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.cats a { border: 1px solid var(--line); border-radius: 999px; padding: 2px 12px; font-size: .85rem; }
.cats small { color: var(--muted); margin-left: 6px; }
.list { list-style: none; padding: 0; margin: 0; }
.list a { display: flex; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--fg); }
.list a:hover span { color: var(--accent); }
.list time, article time { color: var(--muted); font-size: .85rem; font-variant-numeric: tabular-nums; flex-shrink: 0; }
.list-title { font-size: 1.2rem; }
article h1 { font-size: 1.5rem; line-height: 1.5; margin: 4px 0 8px; }
.tags a { font-size: .8rem; margin-right: 8px; }
.body { margin-top: 24px; overflow-wrap: anywhere; }
.body h2 { font-size: 1.15rem; border-left: 4px solid var(--accent); padding-left: 10px; margin-top: 2em; }
.body img { max-width: 100%; height: auto; border-radius: 6px; }
.body figure { margin: 1em 0; }
.pager { display: flex; justify-content: space-between; gap: 16px; margin-top: 48px; padding-top: 16px;
  border-top: 1px solid var(--line); font-size: .9rem; }
.back { margin-top: 24px; }
.login { max-width: 360px; margin: 15vh auto 0; padding: 32px; background: var(--card);
  border: 1px solid var(--line); border-radius: 12px; text-align: center; }
.login input { width: 100%; padding: 10px; margin: 16px 0; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--fg); font-size: 1rem; }
.login button { width: 100%; padding: 10px; border: 0; border-radius: 8px; background: var(--accent);
  color: #fff; font-size: 1rem; cursor: pointer; }
.login .err { color: #c0504d; font-size: .85rem; }