:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #666666;
  --link: #0066cc;
  --border: #eaeaea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f5f5f5;
    --muted: #888888;
    --link: #66b3ff;
    --border: #222222;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 48px 24px 80px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

main { max-width: 640px; margin: 0 auto; }

h1, h2 {
  font-family: ui-rounded, -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 600;
}

h1 { font-size: 28px; margin: 0 0 24px; }
h2 { font-size: 20px; margin: 32px 0 12px; }
p { margin: 16px 0; }

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 15px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  align-items: center;
}
footer a { color: var(--muted); }
footer .spacer { flex: 1; }

/* Marketing hero */
.hero { text-align: center; padding-top: 24px; }

.hero .icon {
  width: 128px;
  height: 128px;
  margin: 0 auto 32px;
  border-radius: 28.6px;
  background: var(--fg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero .icon svg {
  width: 64%;
  height: 64%;
  fill: var(--bg);
}

.hero h1 { font-size: 36px; margin: 0 0 12px; }
.hero .tagline {
  font-size: 18px;
  color: var(--muted);
  margin: 0 0 48px;
}
.hero footer { justify-content: center; border-top: none; padding-top: 0; margin-top: 48px; }