:root {
  color-scheme: light dark;
  --bg: #F5F6F8;
  --surface: #FFFFFF;
  --ink: #1D1D1F;
  --ink-soft: #6E6E73;
  --accent: #0A84FF;
  --line: #E5E5E7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1C1C1E;
    --ink: #F5F5F7;
    --ink-soft: #98989D;
    --line: rgba(255,255,255,.14);
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",Arial,sans-serif; color: var(--ink); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, summary:focus-visible, input:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.wrap { max-width: 800px; margin: 0 auto; padding: 0 24px; }
header { border-bottom: 1px solid var(--line); background: var(--surface); }
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-size: 18px; font-weight: 700; text-decoration: none; }
.brand img { border-radius: 7px; }
.language { font-size: 14px; }
main.wrap { padding-top: 48px; padding-bottom: 72px; }
h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.2; letter-spacing: -.02em; margin: 24px 0 16px; }
.intro, .search-status { color: var(--ink-soft); }
.search { margin-top: 32px; }
.search label { display: block; font-weight: 600; margin-bottom: 8px; }
.search-row { display: flex; gap: 12px; }
.search input { min-width: 0; flex: 1; padding: 14px 16px; font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.search button { padding: 12px 16px; font: inherit; color: var(--accent); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; cursor: pointer; }
.search-status { font-size: 14px; min-height: 1.6em; }
.topics { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0 40px; }
.topics a { padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); font-size: 14px; text-decoration: none; }
.faq-group { margin-top: 40px; scroll-margin-top: 24px; }
.faq-group h2 { font-size: 22px; line-height: 1.3; margin: 0 0 16px; }
.faq details { margin-bottom: 12px; padding: 0 24px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); overflow-wrap: anywhere; scroll-margin-top: 24px; }
.faq details:target { border-color: var(--accent); }
.faq summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 0; font-weight: 700; line-height: 1.4; cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; flex: none; color: var(--ink-soft); font-size: 22px; font-weight: 400; }
.faq details[open] summary::after { content: "-"; }
.faq-a { margin: 0 0 22px; color: var(--ink-soft); font-size: 15px; }
.faq-a p { margin: 0 0 10px; }
.faq-a ul, .faq-a ol { padding-left: 20px; }
.faq-a li { margin-bottom: 8px; }
.answer-link { margin: 0 0 20px; font-size: 13px; }
footer { border-top: 1px solid var(--line); padding: 32px 0; }
.foot-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; color: var(--ink-soft); font-size: 13px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 20px; }
@media (max-width: 480px) {
  .wrap { padding-inline: 16px; }
  .faq details { padding-inline: 18px; }
  .search-row { flex-wrap: wrap; }
  .search input { flex-basis: 100%; }
}