:root {
  --fg: #1a1a1a;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #f6f7f9;
  --accent: #4a6cf7;
  --accent-soft: #e8edff;
  --flag-red: #ee1c25;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.75;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 28px 20px 64px; }
header.pg { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: 34px; flex-wrap: wrap; }
.brand { font-size: 20px; font-weight: 800; color: var(--fg); text-decoration: none; }
.brand .tri { color: var(--flag-red); font-size: .62em; margin: 0 1px; }
nav.pg { display: flex; align-items: center; gap: 16px; }
nav.pg a { color: var(--muted); text-decoration: none; font-size: 14px; }
nav.pg a:hover { color: var(--accent); }
.lang-toggle { border: 1px solid var(--line); background: #fff; color: var(--muted); border-radius: 8px; padding: 2px 8px; font-size: 13px; cursor: pointer; font: inherit; font-size: 13px; }
.lang-toggle:hover { color: var(--accent); border-color: var(--accent); }
h1 { font-size: 26px; margin: 0 0 6px; }
.lead { color: var(--muted); margin: 0 0 26px; }
h2 { font-size: 18px; margin: 30px 0 8px; }
h3 { font-size: 15px; margin: 20px 0 2px; }
p { margin: 8px 0; }
code { background: #eef0f4; padding: 1px 6px; border-radius: 5px; font-size: .92em; }
hr { border: none; border-top: 1px solid var(--line); margin: 30px 0; }
a.inline { color: var(--accent); text-decoration: none; }
a.inline:hover { text-decoration: underline; }
.cta { display: inline-block; margin-top: 24px; background: var(--accent); color: #fff; text-decoration: none; padding: 8px 18px; border-radius: 999px; font-size: 14px; }
.cta:hover { background: #3b5bdb; }
footer.pg { margin-top: 44px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
footer.pg a { color: var(--accent); text-decoration: none; }

/* 语言切换：只显示当前语言 */
html[data-lang="zh"] .en { display: none !important; }
html[data-lang="en"] .zh { display: none !important; }