:root {
  color-scheme: light;
  --bg: #f6f4ef;
  --fg: #1f1d1a;
  --muted: #5f594f;
  --line: #ddd6c8;
  --link: #1d4e89;
  --link-hover: #0f3158;
  --code-bg: #efeae1;
  --code-fg: #1f1d1a;
  --accent: #8a4b2f;
  --surface: #fffdf8;
  --correct: #1f6b45;
  --incorrect: #8d3f3f;
  --warning: #8a4b2f;
  --info: #1d4e89;
  --note: #6b5420;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #161513;
    --fg: #ece8e1;
    --muted: #b3aba0;
    --line: #34302a;
    --link: #9dc1e8;
    --link-hover: #d5e6f8;
    --code-bg: #241f1b;
    --code-fg: #ece8e1;
    --accent: #e0a07a;
    --surface: #1e1b18;
    --correct: #8dcea8;
    --incorrect: #f0b4b0;
    --warning: #e0a07a;
    --info: #9dc1e8;
    --note: #e6d3a1;
  }
}

* { box-sizing: border-box; }

html { font-size: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "YuGothic", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.85;
}

a { color: var(--link); text-underline-offset: 0.18em; }
a:hover { color: var(--link-hover); }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--fg);
  color: var(--bg);
  padding: 0.4rem 0.7rem;
}
.skip-link:focus { top: 0.5rem; }

.site-header,
main,
.site-footer {
  width: min(40rem, calc(100% - 2.5rem));
  margin-inline: auto;
}

.site-header { padding-top: 2.5rem; }
.site-name { margin: 0; font-size: 1rem; letter-spacing: 0.04em; }
.site-name a { color: inherit; text-decoration: none; }
.site-description { margin: 0.35rem 0 0; color: var(--muted); font-size: 0.95rem; }

main { padding: 2rem 0 3rem; }
.site-footer {
  padding-bottom: 3rem;
  color: var(--muted);
  font-size: 0.92rem;
  display: flex;
  gap: 1.25rem;
}
.site-footer p { margin: 0; }

h1, h2, h3 { line-height: 1.45; font-weight: 650; }
h1 { font-size: 1.7rem; margin: 0.4rem 0 0.8rem; }
h2 { font-size: 1.28rem; margin: 2.2rem 0 0.7rem; }
h3 { font-size: 1.08rem; margin: 1.6rem 0 0.5rem; }

.post-list { list-style: none; margin: 0; padding: 0; }
.post-list > li { padding: 1.3rem 0; border-top: 1px solid var(--line); }
.post-list > li:last-child { border-bottom: 1px solid var(--line); }
.post-list h2 { margin: 0.15rem 0 0.4rem; font-size: 1.2rem; }
.post-list p { margin: 0.2rem 0; }
.post-date { margin: 0; color: var(--muted); font-size: 0.9rem; font-variant-numeric: tabular-nums; }

.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; list-style: none; margin: 0.7rem 0 0; padding: 0; }
.tags li {
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.05rem 0.6rem;
  font-size: 0.82rem;
}

.badge, .draft-banner, .preview-note {
  color: var(--accent);
}
.badge { font-size: 0.75rem; border: 1px solid var(--accent); border-radius: 999px; padding: 0.05rem 0.45rem; vertical-align: 0.15em; }
.draft-banner, .preview-note, .empty {
  background: var(--surface);
  border-left: 3px solid var(--accent);
  padding: 0.7rem 0.9rem;
}
.about { color: var(--muted); }

.post-body > :first-child { margin-top: 0; }
.post-body p, .post-body ul, .post-body ol { margin: 0.9rem 0; }
.post-body ul, .post-body ol { padding-left: 1.3rem; }
.post-body li + li { margin-top: 0.25rem }
.post-body blockquote {
  margin: 1.2rem 0;
  padding-left: 1rem;
  border-left: 3px solid var(--line);
  color: var(--muted);
}

code, pre, .code-filename {
  font-family: ui-monospace, "SFMono-Regular", "Source Code Pro", Menlo, Consolas, monospace;
}
code {
  background: var(--code-bg);
  padding: 0.08em 0.32em;
  border-radius: 0.25rem;
  font-size: 0.88em;
}
pre.code {
  background: var(--code-bg);
  color: var(--code-fg);
  overflow-x: auto;
  padding: 0.9rem 1rem;
  border-radius: 0.4rem;
  line-height: 1.6;
  font-size: 0.9rem;
}
pre.code code { background: transparent; padding: 0; font-size: inherit; }
.code-filename {
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}
.code-filename + pre.code { margin-top: 0.25rem; }

.admonition {
  margin: 1.2rem 0;
  padding: 0.2rem 1rem 0.4rem;
  background: var(--surface);
  border-left: 3px solid var(--info);
}
.admonition-note { border-left-color: var(--note); }
.admonition-warning { border-left-color: var(--warning); }
.admonition-label { margin: 0.6rem 0 0; font-size: 0.82rem; color: var(--muted); }

.baseline { font-size: 0.92rem; }

table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
th, td { border-bottom: 1px solid var(--line); text-align: left; padding: 0.4rem 0.5rem; vertical-align: top; }

.quizzes { margin-top: 2.5rem; }
.quiz {
  margin: 1rem 0 1.4rem;
  padding: 0.2rem 0 0.8rem;
  border-top: 1px solid var(--line);
}
.quiz legend { padding: 0.8rem 0 0.4rem; }
.quiz label { display: block; margin: 0.3rem 0; }
.quiz button {
  margin-top: 0.6rem;
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--fg);
  border-radius: 0.3rem;
  padding: 0.25rem 0.8rem;
  font: inherit;
  cursor: pointer;
}
.quiz-result { margin: 0.7rem 0 0; }
.quiz-result[data-state="correct"] { color: var(--correct); }
.quiz-result[data-state="incorrect"] { color: var(--incorrect); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.hljs-comment, .hljs-quote { color: #6d675e; }
.hljs-keyword, .hljs-selector-tag { color: #8d3f3f; }
.hljs-string, .hljs-doctag, .hljs-regexp { color: #2d6a4f; }
.hljs-number, .hljs-literal { color: #8a5a00; }
.hljs-title, .hljs-section, .hljs-name, .hljs-selector-class { color: #1d4e89; }
.hljs-attr, .hljs-attribute, .hljs-variable { color: #6b4c9a; }
.hljs-built_in { color: #0f6f7a; }

@media (prefers-color-scheme: dark) {
  .hljs-comment, .hljs-quote { color: #a39b91; }
  .hljs-keyword, .hljs-selector-tag { color: #f0b4b0; }
  .hljs-string, .hljs-doctag, .hljs-regexp { color: #8dcea8; }
  .hljs-number, .hljs-literal { color: #e6c07b; }
  .hljs-title, .hljs-section, .hljs-name, .hljs-selector-class { color: #9dc1e8; }
  .hljs-attr, .hljs-attribute, .hljs-variable { color: #d2b4f0; }
  .hljs-built_in { color: #8fd0d6; }
}

@media (max-width: 40rem) {
  .site-header, main, .site-footer { width: min(40rem, calc(100% - 1.5rem)); }
  h1 { font-size: 1.45rem; }
}