:root {
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --bg: #ffffff;
  --accent: #007aff;
  --border: #d2d2d7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f5f5f7;
    --muted: #a1a1a6;
    --bg: #000000;
    --accent: #0a84ff;
    --border: #424245;
  }
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

header h1 {
  margin: 0 0 8px;
  font-size: 32px;
  letter-spacing: -0.02em;
}

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

h2 {
  margin-top: 48px;
  margin-bottom: 12px;
  font-size: 22px;
  letter-spacing: -0.01em;
}

h3 {
  margin-top: 32px;
  margin-bottom: 8px;
  font-size: 18px;
}

p, ul, ol {
  margin: 0 0 16px;
}

ul, ol {
  padding-left: 24px;
}

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

a:hover {
  text-decoration: underline;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  background: rgba(0, 0, 0, 0.05);
  padding: 2px 6px;
  border-radius: 4px;
}

@media (prefers-color-scheme: dark) {
  code {
    background: rgba(255, 255, 255, 0.1);
  }
}

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

footer a {
  color: var(--muted);
}

.lang-switch {
  margin: 24px 0 32px;
  font-size: 14px;
  color: var(--muted);
}

.lang-switch a {
  margin-right: 12px;
}

hr.section {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 64px 0;
}