:root {
  --bg: #ffffff;
  --text: #14171a;
  --muted: #5b6770;
  --line: #e3e8ec;
  --card: #f6f8fa;
  --accent: #1da1f2;
  --accent-text: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --text: #e8edf1;
    --muted: #9aa7b2;
    --line: #232b33;
    --card: #151b22;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px 64px; }
header.top {
  display: flex; align-items: center; gap: 12px;
  padding: 20px 0; border-bottom: 1px solid var(--line); margin-bottom: 28px;
}
header.top img { width: 40px; height: 40px; border-radius: 10px; }
header.top a.brand { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; }
header.top nav { margin-left: auto; display: flex; gap: 16px; font-size: 15px; }
a { color: var(--accent); }
header.top nav a { color: var(--muted); text-decoration: none; }
header.top nav a:hover { color: var(--text); }
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 21px; margin: 36px 0 8px; }
h3 { font-size: 17px; margin: 22px 0 4px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
ul { padding-left: 22px; }
li { margin: 6px 0; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15.5px; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; margin: 18px 0; }
.hero { text-align: center; padding: 48px 0 24px; }
.hero img { width: 112px; height: 112px; border-radius: 26px; }
.hero h1 { font-size: 40px; margin-top: 20px; }
.hero p { font-size: 19px; color: var(--muted); max-width: 520px; margin: 8px auto 0; }
.buttons { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin: 28px 0 8px; }
.btn {
  display: inline-block; padding: 13px 22px; border-radius: 12px;
  background: var(--accent); color: var(--accent-text); text-decoration: none; font-weight: 600;
}
.btn.secondary { background: transparent; color: var(--text); border: 1px solid var(--line); }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin-top: 36px; }
.features .card { margin: 0; }
.features h3 { margin-top: 0; }
footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 14.5px; color: var(--muted); }
footer a { color: var(--muted); margin-right: 16px; }