:root {
  --fg: #1a1d21;
  --muted: #5b6470;
  --bg: #ffffff;
  --surface: #f6f7f9;
  --accent: #2563eb;
  --border: #e4e7ec;
  --max-width: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e8eaed;
    --muted: #9aa3ad;
    --bg: #0f1115;
    --surface: #161a20;
    --accent: #60a5fa;
    --border: #262b33;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 20px 64px;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  margin-bottom: 32px;
}

header .brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
  text-decoration: none;
}

header nav {
  float: right;
}

header nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 16px;
  font-size: 14px;
}

header nav a:hover { color: var(--accent); }
header nav a.active { color: var(--accent); }

.lang-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  margin: 0 0 24px;
  font-size: 13px;
}

.lang-bar a {
  color: var(--muted);
  text-decoration: none;
  padding: 2px 6px;
  border-radius: 4px;
}

.lang-bar a:hover { color: var(--accent); background: var(--surface); }
.lang-bar a.active { color: var(--accent); font-weight: 600; }

h1 {
  font-size: 28px;
  line-height: 1.25;
  margin: 0 0 8px;
}

p.updated {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 32px;
}

h2 {
  font-size: 20px;
  line-height: 1.3;
  margin: 32px 0 12px;
}

h3 {
  font-size: 16px;
  margin: 20px 0 8px;
}

p, li { color: var(--fg); }

ul, ol { padding-left: 22px; }
li { margin-bottom: 6px; }

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  margin: 16px 0;
}

footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

.clearfix::after { content: ""; display: block; clear: both; }