:root {
  --bg: #f6f5f1;
  --fg: #16181d;
  --muted: #5b6070;
  --card: #ffffff;
  --line: #e2e0d8;
  --accent: #1f4e79;
  --accent-fg: #ffffff;
  --mask: #16181d;
  --ok: #2d6a4f;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --fg: #ecebe6;
    --muted: #a3a7b3;
    --card: #1a1d23;
    --line: #2b2f37;
    --accent: #7fb2e5;
    --accent-fg: #0d1117;
    --mask: #ecebe6;
    --ok: #74c69d;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
header.top { border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.logo { font-weight: 800; letter-spacing: .18em; text-decoration: none; color: var(--fg); }
nav a { margin-left: 18px; color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--fg); }
.hero { padding: 72px 0 48px; }
.hero h1 { font-size: clamp(32px, 6vw, 54px); line-height: 1.1; margin: 0 0 18px; letter-spacing: -.02em; }
.hero p.lead { font-size: clamp(18px, 2.4vw, 21px); color: var(--muted); max-width: 680px; margin: 0 0 28px; }
.m { background: var(--mask); color: transparent; border-radius: 3px; padding: 0 .15em; user-select: none; }
.btn { display: inline-block; background: var(--accent); color: var(--accent-fg); padding: 12px 20px; border-radius: 8px; text-decoration: none; font-weight: 600; }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--line); margin-left: 8px; }
section { padding: 40px 0; }
section h2 { font-size: 28px; margin: 0 0 18px; letter-spacing: -.01em; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15.5px; }
.demo { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; font-family: ui-monospace, Consolas, monospace; font-size: 15px; overflow-wrap: anywhere; }
.demo .tag { color: var(--ok); font-weight: 600; }
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; }
.steps li { counter-increment: s; padding: 10px 0 10px 44px; position: relative; border-bottom: 1px solid var(--line); }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 10px; width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: var(--accent-fg); display: grid; place-items: center; font-weight: 700; font-size: 14px; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
code, pre { font-family: ui-monospace, Consolas, monospace; font-size: 14px; }
pre { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px; overflow-x: auto; }
.note { color: var(--muted); font-size: 15px; }
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); }
@media (max-width: 560px) {
  nav a { margin: 0 14px 0 0; }
  .btn.ghost { margin: 10px 0 0; }
  .table-scroll { overflow-x: auto; }
}