:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1f1e1c;
  --muted: #6b6862;
  --border: #e4e1da;
  --accent: #b6532f;
  --code-bg: #f3f1ec;
  --note-bg: #f6f1e7;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1918;
    --surface: #222120;
    --text: #e9e6e0;
    --muted: #a19d95;
    --border: #3a3835;
    --accent: #e48a63;
    --code-bg: #2a2826;
    --note-bg: #2c2925;
  }
}
/* 図の SVG は原文サイトの CSS 変数で色を指定している。値は claude.dev の CSS から写した。
   サイト側の変数と名前が衝突しないよう、図の中だけで定義する。--bg はサイトの背景色をそのまま使う */
.diagram {
  --ink: #141413;
  --ink-2: #4c4b45;
  --line: #14141338;
  --line-soft: #1414131c;
  --bg-raised: #f1efe8;
  --bg-panel: #ece9e0;
  --fig-focal: var(--accent);
  --viz-muted: #65645e;
  --viz-wash: var(--bg-raised);
  --viz-wash-2: var(--bg-panel);
  --viz-b0: #788c5d;
  --viz-b1: #b57da8;
  --viz-b2: #955488;
  --viz-b3: #763269;
  --viz-b4: #501a47;
  --viz-b5: #728eb7;
  --viz-b6: #4f70a0;
  --viz-b7: #31507e;
  --viz-b8: #183053;
  --viz-b9: #8e8c87;
  --viz-m1: #3d3d3a;
  --viz-g0: #b46d4f;
  --viz-g1: #7a7973;
  --viz-g2: #86847e;
  --viz-g3: #9a9892;
  --fig-series-1: var(--viz-m1);
  --fig-series-2: var(--viz-muted);
  --fig-series-3: var(--viz-b9);
  --fig-dash-1: none;
  --fig-dash-2: 5 3;
  --fig-dash-3: 1.5 3;
  --fig-chart-ink: var(--viz-muted);
}
@media (prefers-color-scheme: dark) {
  .diagram {
    --ink: #faf9f5;
    --ink-2: #b0aea5;
    --line: #faf9f529;
    --line-soft: #faf9f517;
    --bg-raised: #1a1a18;
    --bg-panel: #1e1d1b;
    --viz-muted: #8f8e87;
    --viz-wash: #1c1c1a;
    --viz-wash-2: #20201e;
    --viz-b1: #925786;
    --viz-b2: #b776a9;
    --viz-b3: #d59cc8;
    --viz-b4: #f2c3e7;
    --viz-b5: #51709d;
    --viz-b6: #7191c0;
    --viz-b7: #98b3db;
    --viz-b8: #c2d6f2;
    --viz-b9: #73716c;
    --viz-m1: #d1cfc5;
    --viz-g0: #9a5b44;
    --viz-g1: #8a8983;
    --viz-g2: #6f6e69;
    --viz-g3: #5a5955;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  font-size: 17px;
  line-height: 1.85;
  overflow-wrap: anywhere;
}
a { color: var(--accent); text-underline-offset: 0.2em; }
.site-header, main, .site-footer { max-width: 46rem; margin: 0 auto; padding: 0 16px; }
.site-header { padding-top: 3rem; padding-bottom: 1.5rem; }
.site-header.compact { padding-top: 1.5rem; padding-bottom: 0; }
.site-header h1 { font-size: 1.75rem; line-height: 1.4; margin: 0 0 0.5rem; }
.lead { color: var(--muted); margin: 0; font-size: 0.95rem; }
.back { font-size: 0.9rem; text-decoration: none; }
.meta { color: var(--muted); font-size: 0.85rem; margin: 0; letter-spacing: 0.02em; }
.category { text-transform: uppercase; }
.original-title { color: var(--muted); font-size: 0.9rem; margin: 0.25rem 0 0; line-height: 1.5; }

.article-list { list-style: none; margin: 0; padding: 0; }
.article-list li { border-top: 1px solid var(--border); padding: 1.5rem 0; }
.article-list h2 { font-size: 1.25rem; line-height: 1.5; margin: 0.25rem 0 0; }
.article-list h2 a { color: var(--text); text-decoration: none; }
.article-list h2 a:hover { color: var(--accent); }
.summary { margin: 0.75rem 0 0; font-size: 0.95rem; }
.empty { color: var(--muted); }

.article-header { padding: 2rem 0 1.5rem; border-bottom: 1px solid var(--border); margin-bottom: 2rem; }
.article-header h1 { font-size: 1.9rem; line-height: 1.45; margin: 0.4rem 0 0; }
.byline { margin: 0.75rem 0 0; font-size: 0.9rem; }
.notice { margin: 1.25rem 0 0; padding: 0.75rem 1rem; background: var(--note-bg); border-radius: 6px; font-size: 0.85rem; color: var(--muted); }

.prose h2 { font-size: 1.45rem; line-height: 1.5; margin: 2.75rem 0 1rem; }
.prose h3 { font-size: 1.2rem; line-height: 1.5; margin: 2.25rem 0 0.75rem; }
.prose h4 { font-size: 1.05rem; line-height: 1.5; margin: 2rem 0 0.5rem; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.25rem; }
.prose li { margin: 0.25rem 0; }
.prose li > ul, .prose li > ol { margin: 0.25rem 0 0; }
.prose blockquote { margin: 0 0 1.25rem; padding: 0.1rem 0 0.1rem 1rem; border-left: 3px solid var(--border); color: var(--muted); }
.prose blockquote p { margin: 0; }
.prose :not(pre) > code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.88em; background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 4px; }
.prose figure { margin: 1.75rem 0; }
.prose img, .prose video { display: block; max-width: 100%; height: auto; border-radius: 6px; background: var(--code-bg); }
.prose figcaption { color: var(--muted); font-size: 0.85rem; line-height: 1.6; margin-top: 0.5rem; }
.prose figure.code { background: var(--code-bg); border-radius: 6px; overflow: hidden; }
.prose figure.code figcaption { margin: 0; padding: 0.4rem 1rem; font-size: 0.75rem; border-bottom: 1px solid var(--border); }
.prose pre { margin: 0; padding: 1rem; overflow-x: auto; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.85rem; line-height: 1.6; overflow-wrap: normal; }
.prose figure.diagram { padding: 1rem; border: 1px solid var(--border); border-radius: 6px; }
.diagram-title { font-weight: 600; font-size: 0.95rem; line-height: 1.5; margin-bottom: 0.75rem; }
.diagram-draw svg { display: block; width: 100%; height: auto; }
/* 原文は画面幅に応じて描き分けた 2 枚の SVG を持ち、CSS で片方だけを表示している */
.diagram-draw .art-diagram-narrow { display: none; }
@media (max-width: 640px) {
  .diagram-draw .art-diagram-wide { display: none; }
  .diagram-draw .art-diagram-narrow { display: block; max-width: 420px; margin-inline: auto; }
}
.prose .note { margin: 1.75rem 0; padding: 0.75rem 1rem; background: var(--note-bg); border-radius: 6px; font-size: 0.9rem; color: var(--muted); }
.table-wrap { overflow-x: auto; margin: 0 0 1.5rem; }
.prose table { border-collapse: collapse; font-size: 0.9rem; line-height: 1.6; min-width: 100%; }
.prose th, .prose td { border: 1px solid var(--border); padding: 0.5rem 0.75rem; text-align: left; vertical-align: top; }
.prose th { background: var(--code-bg); }

.site-footer { padding-top: 3rem; padding-bottom: 3rem; color: var(--muted); font-size: 0.8rem; }