:root {
  --bg: #ffffff;
  --text: #1f2328;
  --muted: #656d76;
  --accent: #1a7f37;
  --accent-dark: #14652c;
  --border: #d0d7de;
  --surface: #f6f8fa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --text: #e6edf3;
    --muted: #9198a1;
    --accent: #3fb950;
    --accent-dark: #2ea043;
    --border: #30363d;
    --surface: #161b22;
  }
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  font-size: 16px;
}
main { max-width: 680px; margin: 0 auto; padding: 24px 20px 56px; }
h1 { font-size: 27px; line-height: 1.25; margin: 8px 0 14px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
h3 { font-size: 16px; margin: 20px 0 4px; }
p, li { color: var(--text); }
.lead { font-size: 18px; color: var(--muted); }
a { color: var(--accent); }
.back { display: inline-block; margin-bottom: 14px; text-decoration: none; font-weight: 600; }
.cta {
  display: inline-block;
  margin: 8px 0 4px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 12px;
}
.cta:hover { background: var(--accent-dark); }
.tip {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  margin: 14px 0;
}
ul, ol { padding-left: 22px; }
li { margin: 5px 0; }
ol.steps { padding-left: 20px; }
ol.steps > li { margin: 10px 0; }
.guide-list { list-style: none; padding: 0; display: grid; gap: 12px; margin: 18px 0; }
.guide-list a {
  display: block;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
}
.guide-list a:hover { border-color: var(--accent); }
.guide-list strong { color: var(--accent); display: block; margin-bottom: 2px; }
.guide-list span { color: var(--muted); font-size: 14px; }
kbd {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 7px;
  font-family: inherit;
  font-size: 14px;
}
footer { margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }
footer a { color: var(--accent); }