:root {
  --accent: #0085CF;
  --ink: #0F172A;
  --body: #334155;
  --muted: #64748B;
  --line: #E3E8EF;
  --bg: #ffffff;
  --code-bg: #F4F6F9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #4DB4EA;
    --ink: #F1F5F9;
    --body: #CBD5E1;
    --muted: #94A3B8;
    --line: #27313F;
    --bg: #0C1117;
    --code-bg: #161C24;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto,
        "Helvetica Neue", Arial, sans-serif;
}

.site-head {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  max-width: 860px;
  margin: 0 auto;
  padding: 22px 20px 18px;
  border-bottom: 1px solid var(--line);
}
.site-head .brand {
  font-weight: 800;
  letter-spacing: .14em;
  color: var(--accent);
  text-decoration: none;
  font-size: 17px;
}
.site-head nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-head nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}
.site-head nav a:hover { color: var(--accent); }

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 36px 20px 64px;
}

h1, h2, h3, h4 { color: var(--ink); line-height: 1.25; letter-spacing: -.01em; }
h1 { font-size: 2.15rem; margin: 0 0 .6em; font-weight: 800; }
h2 { font-size: 1.5rem; margin: 2.2em 0 .6em; font-weight: 700; }
h3 { font-size: 1.15rem; margin: 1.8em 0 .5em; font-weight: 700; }

a { color: var(--accent); }

p, li { color: var(--body); }

code {
  background: var(--code-bg);
  padding: .15em .4em;
  border-radius: 4px;
  font-size: .89em;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: none; padding: 0; font-size: .85em; }

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.4em 0;
  font-size: .94em;
  display: block;
  overflow-x: auto;
}
th, td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
th { background: var(--code-bg); color: var(--ink); font-weight: 600; }

blockquote {
  margin: 1.4em 0;
  padding: 2px 18px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

img { max-width: 100%; height: auto; border-radius: 10px; }

hr { border: 0; border-top: 1px solid var(--line); margin: 2.4em 0; }

.site-foot {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 20px 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13.5px;
}
.site-foot p { margin: .4em 0; color: var(--muted); }

.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin: 1.6em 0; }
.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
}
.card h3 { margin: 0 0 .3em; font-size: 1rem; }
.card p { margin: 0; font-size: .9rem; color: var(--muted); }