:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #111111;
  --muted: #5b5b5b;
  --border: #e6e6e6;
  --accent: #0a66ff;
  --code-bg: #f5f5f7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0d10;
    --fg: #ededed;
    --muted: #9c9c9c;
    --border: #262629;
    --accent: #5c8dff;
    --code-bg: #1a1a1d;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}

header.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

header.brand .logo {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: #000;
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.5px;
}

@media (prefers-color-scheme: dark) {
  header.brand .logo {
    background: #fff;
    color: #000;
  }
}

header.brand h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

header.brand .subtitle {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--muted);
}

h1.page-title {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin: 0 0 8px;
}

p.lead {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 32px;
}

h2 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.2px;
  margin: 40px 0 12px;
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
}

p, ul, ol {
  margin: 0 0 14px;
}

ul, ol { padding-left: 22px; }

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover { text-decoration: underline; }

code {
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 14px;
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
}

.lang-switch {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
  font-size: 14px;
}

.lang-switch a {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--fg);
}

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

footer.legal-footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
}

@media (max-width: 540px) {
  .cards { grid-template-columns: 1fr; }
}

.card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 22px 18px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.12s ease, border-color 0.12s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  text-decoration: none;
}

.card h3 {
  margin: 0 0 4px;
  font-size: 18px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}