:root {
  --bg: #ffffff;
  --bg-soft: #f4f5f7;
  --fg: #0f1115;
  --fg-soft: #5b6270;
  --accent: #1f8a4c;
  --accent-soft: #1f8a4c1a;
  --border: #e6e8ec;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181d;
    --bg-soft: #1f2229;
    --fg: #f1f3f6;
    --fg-soft: #9aa1ad;
    --accent: #2ecc71;
    --accent-soft: #2ecc7122;
    --border: #2a2e36;
  }
}

* {
  box-sizing: border-box;
}

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

.hero {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand img {
  border-radius: 12px;
}

.brand h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: -0.01em;
}

.brand p {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--fg-soft);
}

.lang {
  display: flex;
  gap: 4px;
  background: var(--bg-soft);
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--border);
}

.lang a {
  text-decoration: none;
  color: var(--fg-soft);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  transition: background 0.15s, color 0.15s;
}

.lang a.active {
  background: var(--accent);
  color: #fff;
}

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

.lang-section {
  display: none;
}

.lang-section.active {
  display: block;
}

.meta {
  font-size: 12px;
  color: var(--fg-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 24px;
}

h2 {
  font-size: 16px;
  margin: 28px 0 8px;
  letter-spacing: -0.01em;
}

p,
ul {
  margin: 0 0 12px;
  font-size: 14px;
}

ul {
  padding-left: 20px;
}

li {
  margin: 4px 0;
}

code {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

footer {
  max-width: 720px;
  margin: 40px auto;
  padding: 24px;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--fg-soft);
  font-size: 12px;
}