:root {
  --fg: #111;
  --muted: #555;
  --accent: #1a73e8;
  --bg: #fff;
  --border: #e5e7eb;
  --code-bg: #f6f8fa;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  font-size: 16px;
}
.wrap {
  max-width: 780px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}
header.site {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 780px;
  margin: 0 auto;
}
header.site a { color: var(--fg); text-decoration: none; }
header.site .brand { font-weight: 600; font-size: 1.1rem; }
header.site nav a { margin-left: 1rem; color: var(--muted); font-size: 0.9rem; }
header.site nav a:hover { color: var(--accent); }
h1 { font-size: 2rem; margin: 0 0 0.25rem; }
h2 { font-size: 1.3rem; margin-top: 2rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
h3 { font-size: 1.05rem; margin-top: 1.5rem; }
p, li { color: var(--fg); }
.meta { color: var(--muted); font-size: 0.9rem; margin-bottom: 2rem; }
.note {
  background: #fff7e6;
  border-left: 4px solid #f0ad4e;
  padding: 0.75rem 1rem;
  border-radius: 4px;
  margin: 1rem 0;
  font-size: 0.9rem;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
  vertical-align: top;
}
th { background: var(--code-bg); font-weight: 600; }
code {
  background: var(--code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.9em;
}
a { color: var(--accent); }
footer {
  max-width: 780px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.lang-switch { font-size: 0.85rem; }
.lang-switch a { margin-left: 0.5rem; }