/* Knowledge Trail — minimal, fast, dependency-free blog stylesheet. */
:root {
  --bg: #fbfbfa;
  --fg: #1f2328;
  --muted: #6b7280;
  --line: #e7e7e4;
  --accent: #2f6f4f;
  --accent-weak: #eef5f0;
  --code-bg: #f4f4f2;
  --max: 46rem;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c; --fg: #e6e6e3; --muted: #9aa0a6; --line: #2a2d33;
    --accent: #6cc296; --accent-weak: #1d2620; --code-bg: #1d2024;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: var(--font); font-size: 18px; line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.15rem; }

/* Header / footer */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap {
  display: flex; align-items: baseline; justify-content: space-between;
  flex-wrap: wrap; gap: .5rem; padding-top: 1.1rem; padding-bottom: 1.1rem;
}
.brand { font-weight: 700; font-size: 1.2rem; color: var(--fg); text-decoration: none; letter-spacing: -.01em; }
.brand:hover { color: var(--accent); }
.site-header nav a { color: var(--muted); text-decoration: none; margin-left: 1rem; font-size: .95rem; }
.site-header nav a:hover { color: var(--accent); }
.site-footer { border-top: 1px solid var(--line); margin-top: 4rem; color: var(--muted); font-size: .88rem; }
.site-footer .wrap { padding-top: 1.6rem; padding-bottom: 2.4rem; }

main { padding-top: 2.2rem; }

/* Index list */
.tagline { color: var(--muted); margin: .2rem 0 2.4rem; }
.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li { padding: 1.15rem 0; border-bottom: 1px solid var(--line); }
.post-list a { color: var(--fg); text-decoration: none; font-size: 1.22rem; font-weight: 600; letter-spacing: -.01em; }
.post-list a:hover { color: var(--accent); }
.post-list .summary { color: var(--muted); margin: .3rem 0 0; font-size: .98rem; }
.post-meta { color: var(--muted); font-size: .82rem; margin-top: .35rem; }

/* Article */
article h1 { font-size: 2rem; line-height: 1.2; letter-spacing: -.02em; margin: 0 0 .4rem; }
article > p:first-of-type { font-size: 1.05rem; }
article h2 { font-size: 1.4rem; margin: 2.2rem 0 .6rem; letter-spacing: -.01em; }
article h3 { font-size: 1.12rem; margin: 1.6rem 0 .4rem; }
article p, article ul, article ol { margin: 0 0 1.05rem; }
article ul, article ol { padding-left: 1.4rem; }
article li { margin: .3rem 0; }
a { color: var(--accent); }
blockquote {
  margin: 1.2rem 0; padding: .4rem 0 .4rem 1.1rem;
  border-left: 3px solid var(--accent); color: var(--muted);
}
code {
  font-family: var(--mono); font-size: .88em;
  background: var(--code-bg); padding: .12em .38em; border-radius: 4px;
}
pre {
  background: var(--code-bg); border: 1px solid var(--line); border-radius: 8px;
  padding: .9rem 1rem; overflow-x: auto; line-height: 1.5; font-size: .86rem;
}
pre code { background: none; padding: 0; font-size: inherit; }
hr { border: none; border-top: 1px solid var(--line); margin: 2.4rem 0; }
table { border-collapse: collapse; width: 100%; margin: 1.2rem 0; font-size: .94rem; }
th, td { border: 1px solid var(--line); padding: .5rem .65rem; text-align: left; }
th { background: var(--accent-weak); }
.tags { margin-top: 2.5rem; }
.tags span {
  display: inline-block; background: var(--accent-weak); color: var(--accent);
  font-size: .78rem; padding: .18rem .55rem; border-radius: 99px; margin: 0 .3rem .3rem 0;
}
.backlink { display: inline-block; margin-top: 2.5rem; color: var(--muted); text-decoration: none; font-size: .9rem; }
.backlink:hover { color: var(--accent); }
img { max-width: 100%; height: auto; }