:root {
  --bg: #fbfaf7; --fg: #1c1b19; --muted: #6b675f; --line: #e3dfd6; --panel: #ffffff;
  --accent: #1f5f8b; --bad: #a3261b;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161514; --fg: #ecebe7; --muted: #a19d94; --line: #34322e; --panel: #1f1e1c;
    --accent: #7db7e0; --bad: #f0897e;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
.top, main, .foot { max-width: 960px; margin: 0 auto; padding: 0 16px; }
.top { display: flex; align-items: center; justify-content: space-between; padding-top: 18px; padding-bottom: 18px; }
.brand { font-weight: 650; color: var(--fg); text-decoration: none; letter-spacing: -0.01em; }
.langs { display: flex; gap: 4px; }
.langs a {
  display: inline-flex; align-items: center; justify-content: center; text-decoration: none;
  font-size: 13px; color: var(--muted); border: 1px solid transparent;
  border-radius: 6px; padding: 4px 8px; min-height: 44px; min-width: 44px;
}
.langs a[aria-current="page"] { color: var(--fg); border-color: var(--line); background: var(--panel); }
.hero { padding: 48px 0 8px; max-width: 720px; }
h1 { font-size: 42px; line-height: 1.12; letter-spacing: -0.025em; margin: 0 0 16px; }
.lead { font-size: 19px; color: var(--muted); margin: 0 0 28px; }
.ctas { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-flex; align-items: center; min-height: 46px; padding: 0 22px; border-radius: 8px;
  background: var(--accent); color: #fff; text-decoration: none; font-weight: 600;
}
@media (prefers-color-scheme: dark) { .button { color: #0f1a22; } }
.button.secondary { background: none; color: var(--accent); border: 1px solid var(--line); }
.button[hidden] { display: none; }
.note { color: var(--muted); font-size: 14px; margin: 16px 0 0; }
section { margin-bottom: 56px; }
h2 { font-size: 24px; letter-spacing: -0.015em; margin: 0 0 16px; }
h3 { font-size: 17px; margin: 0 0 6px; }
.finding {
  background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--bad);
  border-radius: 8px; padding: 14px 16px; font: 14px/1.6 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere;
  margin: 0 0 16px;
}
.finding .sev { color: var(--bad); font-weight: 700; }
.muted { color: var(--muted); }
.example p { color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.cards article { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 18px; }
.cards p { margin: 0; color: var(--muted); font-size: 15px; }
code { font: 14px var(--mono); }
.foot { padding-top: 16px; padding-bottom: 32px; font-size: 14px; color: var(--muted); }
@media (max-width: 760px) {
  h1 { font-size: 32px; }
  .hero { padding-top: 24px; }
  .cards { grid-template-columns: 1fr; }
}
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer; list-style: none; padding: 14px 28px 14px 0; font-weight: 600; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 12px; color: var(--muted); font-weight: 400; font-size: 20px;
}
.faq details[open] summary::after { content: "−"; }
.faq summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.faq details p { margin: 0 0 16px; color: var(--muted); }
.foot::before { content: ""; display: block; border-top: 1px solid var(--line); margin-bottom: 16px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.links { display: flex; gap: 16px; margin-left: auto; margin-right: 12px; }
.links a { color: var(--muted); text-decoration: none; display: inline-flex; align-items: center; min-height: 44px; }
.rule h1 { font-size: 32px; margin-bottom: 8px; }
.rule h1 code { font: inherit; font-family: var(--mono); letter-spacing: -0.02em; }
.rule h2 { font-size: 19px; margin: 28px 0 8px; }
.rule-list code { font: 0.9em var(--mono); color: var(--accent); margin-right: 6px; }
.term { white-space: nowrap; }
.langs-list { display: grid; grid-template-columns: max-content 1fr; gap: 10px 20px; margin: 24px 0; }
.langs-list dt { color: var(--muted); }
.langs-list dd { margin: 0; }
.rule-list { list-style: none; padding: 0; margin: 0 0 32px; display: grid; gap: 8px; }
.rule-list a { color: var(--fg); text-decoration: none; display: block; padding: 6px 0; }
.rule-list a:hover code, .rule-list a:focus-visible code { text-decoration: underline; }
.toc { columns: 2; padding-left: 18px; margin: 0 0 32px; }
.toc li { margin-bottom: 4px; }
.prevnext { display: flex; justify-content: space-between; margin: 32px 0 8px; font-family: var(--mono); font-size: 14px; }
@media (max-width: 520px) { .toc { columns: 1; } .langs-list { grid-template-columns: 1fr; gap: 2px; } .langs-list dd { margin-bottom: 10px; } }