:root {
  --bg: #ffffff; --fg: #1a1a1a; --muted: #666; --border: #e0e0e0;
  --accent: #dc2626; --badge-bg: #f3f3f3; --card-bg: #fafafa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a; --fg: #e8e8e8; --muted: #9a9a9a; --border: #2c2f36;
    --accent: #f87171; --badge-bg: #22252b; --card-bg: #1b1e24;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  line-height: 1.7;
}
.container { max-width: 760px; margin: 0 auto; padding: 1.5rem 1rem 4rem; }
header .sitename { margin: 0; font-size: 1.6rem; font-weight: 700; }
header .sitename a { color: var(--fg); text-decoration: none; }
header .subtitle { color: var(--muted); font-size: .9rem; margin: .2rem 0 0; }
.date-heading { font-size: 1.25rem; margin: 2rem 0 .3rem; }
h1.date-heading { font-size: 1.5rem; }
.overview {
  background: var(--card-bg); border-left: 4px solid var(--accent);
  padding: .8rem 1rem; margin: 1rem 0 1.5rem; border-radius: 0 6px 6px 0;
}
article {
  border-bottom: 1px solid var(--border); padding: 1rem 0;
  display: flex; gap: 1rem; align-items: flex-start;
}
.art-body { flex: 1; min-width: 0; }
.thumb {
  width: 132px; aspect-ratio: 16 / 10; object-fit: cover;
  border-radius: 8px; flex: none; margin-top: .3rem; background: var(--badge-bg);
}
@media (max-width: 480px) { .thumb { width: 96px; } }
article h3 { margin: 0 0 .3rem; font-size: 1.05rem; }
article h3 a { color: var(--accent); text-decoration: none; }
article h3 a:hover { text-decoration: underline; }
.meta { font-size: .8rem; color: var(--muted); }
.badge {
  display: inline-block; font-size: .72rem; padding: .1rem .5rem;
  border-radius: 999px; background: var(--badge-bg); margin-right: .4rem;
}
.badge.important { background: var(--accent); color: #fff; }
article p { margin: .4rem 0 0; font-size: .95rem; }
.archive-list { padding-left: 1.2rem; }
.nav { margin-top: .5rem; }
.nav a {
  color: var(--accent); text-decoration: none; font-size: .9rem;
  margin-right: 1rem; font-weight: 600;
}
.breadcrumb { font-size: .8rem; color: var(--muted); margin: 0 0 .5rem; }
.breadcrumb a { color: var(--muted); }
.article-list { list-style: none; padding: 0; }
.article-list li { border-bottom: 1px solid var(--border); padding: .8rem 0; }
.article-list a { color: var(--accent); text-decoration: none; font-weight: 600; }
.article-list .desc { margin: .2rem 0 0; font-size: .9rem; }
.article-body h2 { font-size: 1.2rem; margin-top: 2rem; border-bottom: 1px solid var(--border); padding-bottom: .3rem; }
.article-body h3 { font-size: 1.05rem; margin-top: 1.5rem; }
.article-body code {
  background: var(--badge-bg); padding: .1rem .35rem; border-radius: 4px;
  font-size: .88em;
}
.article-body pre {
  background: var(--badge-bg); padding: .8rem 1rem; border-radius: 8px;
  overflow-x: auto;
}
.article-body pre code { background: none; padding: 0; }
.article-body table { border-collapse: collapse; width: 100%; font-size: .9rem; display: block; overflow-x: auto; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: .4rem .6rem; text-align: left; }
.article-body img { max-width: 100%; height: auto; display: block; border: 1px solid var(--border); border-radius: 6px; }
.article-body figure { margin: 1.5rem 0; }
.article-body figcaption { font-size: .85rem; color: var(--muted); margin-top: .4rem; }
.article-body .grid { display: grid; gap: 1.2rem; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.article-body .grid figure { margin: 0; }
footer { margin-top: 3rem; font-size: .8rem; color: var(--muted); }
footer a { color: var(--muted); }
.related { margin-top: .6rem; }
.related a { margin-right: .8rem; white-space: nowrap; }