:root {
  --bg: #fcfcfa;
  --surface: #f7f7f5;
  --border: #dededa;
  --ink: #202022;
  --ink-secondary: #6d6d6b;
  --ink-tertiary: #8b8b87;
  --link: #29292b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151515;
    --surface: #1d1d1d;
    --border: #4a4a47;
    --ink: #f1f1ee;
    --ink-secondary: #b0b0ac;
    --ink-tertiary: #858581;
    --link: #f1f1ee;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
  gap: 16px;
}

.brand {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
}

.lang-toggle {
  font: inherit;
  font-size: 14px;
  color: var(--ink-secondary);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
}

.lang-toggle:hover {
  color: var(--ink);
  border-color: var(--ink-secondary);
}

.lang-toggle:focus-visible {
  outline: 2px solid var(--ink-secondary);
  outline-offset: 2px;
}

h1 {
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}

.updated {
  color: var(--ink-tertiary);
  font-size: 14px;
  margin: 0 0 40px;
}

h2 {
  font-size: 19px;
  margin: 40px 0 12px;
  letter-spacing: -0.005em;
}

p {
  color: var(--ink-secondary);
  margin: 0 0 14px;
}

ul {
  margin: 0 0 14px;
  padding-left: 20px;
  color: var(--ink-secondary);
}

li {
  margin-bottom: 8px;
}

li::marker {
  color: var(--ink-tertiary);
}

strong {
  color: var(--ink);
  font-weight: 600;
}

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  margin: 24px 0;
}

.card p {
  margin: 0;
}

footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--ink-tertiary);
  font-size: 13px;
}