:root {
  --bg: #fbfbf9;
  --surface: #ffffff;
  --text: #1c1f1d;
  --muted: #5d655f;
  --border: #e3e6e1;
  --accent: #127a4b;
  --accent-soft: #e6f3ec;
  --code-bg: #f1f3ef;
  --note-bg: #fff8e6;
  --note-border: #e8c766;
  --radius: 10px;
  --wrap: 1080px;
  --prose: 720px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Code", Consolas, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131614;
    --surface: #1b1f1c;
    --text: #e7ebe8;
    --muted: #a1aba4;
    --border: #2c322e;
    --accent: #4cc38a;
    --accent-soft: #1d3228;
    --code-bg: #222824;
    --note-bg: #2b2616;
    --note-border: #8a7433;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 var(--font);
}
a { color: var(--accent); }
img { max-width: 100%; height: auto; border-radius: var(--radius); border: 1px solid var(--border); }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }

/* header */
.site-header { background: var(--surface); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; flex-wrap: wrap; }
.logo { font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; display: flex; align-items: center; gap: 8px; }
.logo-mark { color: var(--accent); font-size: 1.3rem; line-height: 1; }
.main-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.main-nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
.main-nav a:hover { color: var(--accent); }

/* home */
.hero { padding: 56px 0 24px; max-width: var(--prose); }
.hero h1 { font-size: clamp(1.9rem, 5vw, 2.8rem); line-height: 1.15; margin: 0 0 12px; letter-spacing: -.02em; }
.hero h1 span { color: var(--accent); }
.hero p { color: var(--muted); font-size: 1.1rem; margin: 0; }
.home-section { margin: 40px 0; }
.section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.section-head h2 { margin: 0 0 16px; }
.section-head a { font-size: .95rem; text-decoration: none; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.card {
  display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; text-decoration: none; color: var(--text); transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 8px 0 6px; font-size: 1.08rem; line-height: 1.35; }
.card p { margin: 0; color: var(--muted); font-size: .93rem; line-height: 1.5; }
.tag { display: inline-block; font-size: .75rem; font-weight: 600; color: var(--accent); background: var(--accent-soft); padding: 2px 8px; border-radius: 99px; }

.page-head { margin: 8px 0 24px; max-width: var(--prose); }
.page-head h1 { margin: 0 0 6px; }
.page-head p { color: var(--muted); margin: 0; }

/* article */
.crumbs { font-size: .88rem; color: var(--muted); margin: 24px 0 8px; }
.crumbs a { color: var(--muted); }
.article { max-width: var(--prose); }
.article h1 { font-size: clamp(1.7rem, 4.5vw, 2.4rem); line-height: 1.2; margin: 8px 0 8px; letter-spacing: -.015em; }
.article.page h1 { margin-top: 32px; }
.meta { color: var(--muted); font-size: .9rem; margin: 0 0 24px; }
.prose h2 { font-size: 1.45rem; margin: 2.2em 0 .6em; line-height: 1.3; scroll-margin-top: 16px; }
.prose h3 { font-size: 1.15rem; margin: 1.8em 0 .5em; }
.prose li { margin: .35em 0; }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--code-bg); padding: 2px 6px; border-radius: 5px; }
.prose pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; font-size: .92rem; }
.prose kbd { font-family: var(--mono); font-size: .82em; border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 4px; padding: 1px 5px; background: var(--surface); }
.prose table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: .93rem; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; }
.prose th { background: var(--code-bg); }
.prose figure { margin: 1.5em 0; }
.prose figure img { display: block; background: #fff; }
.prose figcaption { font-size: .88rem; color: var(--muted); margin-top: 8px; text-align: center; }
.note {background: var(--note-bg); border-left: 4px solid var(--note-border); padding: 12px 16px; border-radius: 0 var(--radius) var(--radius) 0; margin: 1.2em 0; }
.note p { margin: 0; }
.toc { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; margin: 1.5em 0; }
.toc p { margin: 0 0 4px; font-weight: 600; }
.toc ol { margin: 0; padding-left: 20px; }
.toc a { text-decoration: none; }
.author-box { margin: 40px 0 0; padding: 18px; background: var(--accent-soft); border-radius: var(--radius); font-size: .95rem; }
.author-box p { margin: 6px 0 0; }
.related { margin: 48px 0; }
.related h2 { font-size: 1.3rem; }

/* footer */
.site-footer { margin-top: 64px; border-top: 1px solid var(--border); background: var(--surface); font-size: .9rem; color: var(--muted); }
.footer-inner { padding: 28px 16px; }
.footer-inner nav { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 10px 0; }
.footer-inner nav a { color: var(--muted); }
.footer-brand { margin: 0; }
.fine { font-size: .8rem; margin: 10px 0 0; }