:root {
  color-scheme: light dark;

  --bg: #ffffff;
  --fg: #111111;
  --fg-muted: #555555;
  --link: #4f46e5;
  --link-hover: #312e81;
  --border: #e5e5e5;
  --card: #fafafa;
  --max: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0f;
    --fg: #f2f2f2;
    --fg-muted: #9aa0a6;
    --link: #a5b4fc;
    --link-hover: #c7d2fe;
    --border: #2a2a30;
    --card: #16161d;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
               Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.site {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 15px;
}

header.site a.brand {
  font-weight: 600;
  text-decoration: none;
  color: var(--fg);
  letter-spacing: -0.01em;
}

header.site nav a {
  color: var(--fg-muted);
  text-decoration: none;
  margin-left: 16px;
}

header.site nav a:hover { color: var(--fg); }

footer.site {
  max-width: var(--max);
  margin: 0 auto;
  padding: 32px 24px 48px;
  font-size: 14px;
  color: var(--fg-muted);
  border-top: 1px solid var(--border);
}

footer.site a {
  color: var(--fg-muted);
  text-decoration: none;
  margin-right: 16px;
}

footer.site a:hover { color: var(--fg); }

h1, h2, h3, h4 {
  letter-spacing: -0.015em;
  line-height: 1.3;
  margin-top: 1.6em;
  margin-bottom: 0.5em;
}

h1 { font-size: 32px; margin-top: 0; }
h2 { font-size: 24px; }
h3 { font-size: 19px; }

p, ul, ol { margin: 0 0 1em 0; }

a { color: var(--link); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--link-hover); }

ul, ol { padding-left: 24px; }
li { margin-bottom: 6px; }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 48px 0;
}

blockquote {
  margin: 16px 0;
  padding: 12px 16px;
  background: var(--card);
  border-left: 3px solid var(--border);
  color: var(--fg-muted);
  font-size: 15px;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--card);
  padding: 1px 6px;
  border-radius: 4px;
}

.meta {
  color: var(--fg-muted);
  font-size: 14px;
  margin-bottom: 24px;
}

.lang-switch {
  display: inline-flex;
  gap: 8px;
  margin: 16px 0 32px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  font-size: 14px;
}

.lang-switch a {
  padding: 6px 12px;
  text-decoration: none;
  color: var(--fg-muted);
  border-radius: 6px;
}

.lang-switch a.active {
  background: var(--bg);
  color: var(--fg);
  font-weight: 500;
}

.hero {
  padding: 64px 0 32px;
}

.hero h1 {
  font-size: 44px;
  margin: 0 0 12px;
}

.hero p.lede {
  font-size: 19px;
  color: var(--fg-muted);
  max-width: 520px;
  margin: 0 0 24px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.cta {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 10px;
  background: var(--fg);
  color: var(--bg);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
}

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

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 48px 0;
}

@media (max-width: 600px) {
  .feature-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 36px; }
  main { padding: 32px 20px 64px; }
}

.feature {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
}

.feature h3 { margin: 0 0 6px; font-size: 17px; }
.feature p { margin: 0; font-size: 15px; color: var(--fg-muted); }