:root {
  color-scheme: light;
  --text: #191f28;
  --muted: #6b7684;
  --line: #e5e8eb;
  --bg: #f9fafb;
  --card: #ffffff;
  --primary: #3182f6;
  --soft: #f2f6ff;
}

* { box-sizing: border-box; }
html, body { max-width: 100%; overflow-x: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}
main { width: 100%; max-width: 960px; min-width: 0; margin: 0 auto; padding: 40px 20px 64px; }
article {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 34px;
}
h1 { margin: 0 0 8px; font-size: 30px; line-height: 1.25; }
h2 { margin: 34px 0 10px; font-size: 21px; line-height: 1.4; }
h3 { margin: 24px 0 8px; font-size: 17px; }
p, li { font-size: 15px; }
p { margin: 8px 0; }
p, li, th, td, a { overflow-wrap: anywhere; }
ul, ol { padding-left: 22px; }
a { color: var(--primary); }
code { background: #f1f3f5; padding: 1px 5px; border-radius: 4px; font-size: 13px; }
table { width: 100%; border-collapse: collapse; margin: 12px 0 18px; font-size: 14px; }
th, td { border: 1px solid var(--line); padding: 10px; text-align: left; vertical-align: top; }
th { background: #f5f6f8; font-weight: 700; }
.lang-switch {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
}
.lang-switch a { color: var(--muted); text-decoration: none; }
.lang-switch a.active { color: var(--text); font-weight: 700; }
.meta { color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.summary {
  min-width: 0;
  max-width: 100%;
  margin: 18px 0 24px;
  padding: 16px 18px;
  border: 1px solid #dbe7ff;
  border-radius: 10px;
  background: var(--soft);
}
.summary p:first-child { margin-top: 0; }
.summary ul { margin-bottom: 0; }
.note { color: var(--muted); font-size: 14px; }
.warning {
  padding: 14px 16px;
  border-left: 4px solid #f59f00;
  background: #fff9db;
}
@media (max-width: 640px) {
  main { padding: 20px 12px 40px; }
  article { padding: 22px 18px; border-radius: 10px; }
  h1 { font-size: 26px; }
  table { display: block; width: 100%; max-width: 100%; overflow-x: auto; white-space: normal; }
}