:root {
  color-scheme: light dark;
  --text: #1a1a1a;
  --muted: #5c6670;
  --bg: #ffffff;
  --border: #e4e8ec;
  --link: #0b7ea4;
  --nav-bg: #f5f7f8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #eef2f5;
    --muted: #9aa3ad;
    --bg: #101c22;
    --border: #243038;
    --link: #5ec8e8;
    --nav-bg: #16242c;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

header {
  border-bottom: 1px solid var(--border);
  background: var(--nav-bg);
  padding: 16px 24px;
}

header .inner,
main {
  max-width: 760px;
  margin: 0 auto;
}

header .inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
}

.lang-switch a {
  color: var(--link);
  text-decoration: none;
  margin-left: 12px;
  font-size: 14px;
}

.lang-switch a.active {
  font-weight: 700;
  text-decoration: underline;
}

main {
  padding: 32px 24px 64px;
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 8px;
}

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

nav.toc {
  background: var(--nav-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 32px;
  font-size: 14px;
}

nav.toc ol {
  margin: 8px 0 0;
  padding-left: 20px;
}

nav.toc a {
  color: var(--link);
  text-decoration: none;
}

section {
  margin-bottom: 28px;
}

h2 {
  font-size: 1.15rem;
  margin: 0 0 12px;
  scroll-margin-top: 80px;
}

h3 {
  font-size: 1rem;
  margin: 16px 0 8px;
}

p,
ul {
  margin: 0 0 12px;
}

ul {
  padding-left: 22px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 12px 0;
}

th,
td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

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