:root {
  --bg: #0f1115;
  --card: #181b22;
  --text: #e8eaf0;
  --muted: #9aa3b2;
  --accent: #ffb703;
  --border: #272c37;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fa;
    --card: #ffffff;
    --text: #1b1f27;
    --muted: #5c6575;
    --accent: #b86e00;
    --border: #e2e5ec;
  }
}

* { box-sizing: border-box; }

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

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

header.site {
  border-bottom: 1px solid var(--border);
  background: var(--card);
}

header.site .inner,
main,
footer.site .inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 20px;
}

header.site .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: .2px;
}

nav a { margin-left: 18px; text-decoration: none; color: var(--muted); }
nav a:hover { color: var(--accent); }

main { padding-top: 36px; padding-bottom: 56px; }

h1 { font-size: 2rem; margin: 0 0 6px; line-height: 1.2; }
h2 { font-size: 1.25rem; margin: 2.2em 0 .5em; padding-top: .4em; border-top: 1px solid var(--border); }
h3 { font-size: 1.05rem; margin: 1.5em 0 .3em; }

.meta { color: var(--muted); margin-top: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 22px;
  margin: 20px 0;
}

.hero { padding: 24px 0 8px; }
.hero p.lead { font-size: 1.15rem; color: var(--muted); max-width: 60ch; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #111;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  margin-right: 8px;
}

.btn.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: .95rem; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border: 1px solid var(--border); }
th { background: var(--card); }

ul { padding-left: 1.2em; }
li { margin: .25em 0; }

.toc ol { margin: 0; padding-left: 1.3em; columns: 2; column-gap: 32px; }
@media (max-width: 600px) { .toc ol { columns: 1; } }

footer.site {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .9rem;
  padding: 22px 0 36px;
}