:root {
  color-scheme: light;
  --paper: #ffffff;
  --canvas: #f6f8fc;
  --ink: #182b47;
  --body: #435570;
  --muted: #566880;
  --blue: #245cc5;
  --blue-dark: #18449a;
  --blue-light: #eaf1ff;
  --line: #dce4ef;
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--body);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}
a { color: var(--blue); text-underline-offset: 4px; }
a:hover { color: var(--blue-dark); }
a:focus-visible, summary:focus-visible {
  outline: 3px solid #4284ed;
  outline-offset: 5px;
  border-radius: 3px;
}
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { color: var(--ink); font-weight: 650; line-height: 1.4; }
h1 { margin-bottom: 20px; font-size: clamp(36px, 4.4vw, 58px); letter-spacing: -.04em; }
h2 { margin-bottom: 18px; font-size: 27px; letter-spacing: -.025em; }
h3 { margin-bottom: 10px; font-size: 19px; }
p { margin-bottom: 16px; }
strong { color: var(--ink); font-weight: 650; }
small { font-size: 13px; }
code { padding: 2px 6px; background: var(--canvas); color: var(--ink); border-radius: 4px; font-size: .88em; overflow-wrap: anywhere; }
::selection { color: var(--ink); background: #d5e5ff; }
.wrap { width: min(1080px, calc(100% - 64px)); margin-inline: auto; }
.skip-link {
  position: fixed;
  top: 12px;
  left: 16px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--ink);
  color: white;
  transform: translateY(-160%);
}
.skip-link:focus { transform: none; color: white; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.header-inner { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); text-decoration: none; white-space: nowrap; }
.brand:hover { color: var(--ink); }
.brand-mark {
  width: 39px;
  height: 39px;
  display: inline-grid;
  place-items: center;
  background: var(--blue);
  border-radius: 12px;
  color: white;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1;
}
.brand-name { font-size: 19px; font-weight: 650; letter-spacing: .025em; }
.site-nav { display: flex; align-items: center; gap: 29px; }
.site-nav a { padding-block: 26px 23px; border-bottom: 3px solid transparent; color: var(--body); text-decoration: none; font-size: 14px; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--blue); border-bottom-color: var(--blue); }
.eyebrow { margin-bottom: 20px; color: var(--blue); font-size: 12px; font-weight: 650; letter-spacing: .15em; }
.hero { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(270px, .8fr); gap: 74px; padding-block: 82px 76px; align-items: start; }
.hero h1 { font-size: clamp(44px, 5.5vw, 68px); }
.lead { max-width: 560px; color: var(--body); font-size: 18px; line-height: 1.95; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 13px; margin-top: 28px; }
.button { min-height: 47px; padding: 9px 20px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--blue); border-radius: 8px; background: var(--blue); color: white; text-decoration: none; font-size: 14px; font-weight: 550; }
.button:hover { background: var(--blue-dark); border-color: var(--blue-dark); color: white; }
.button.secondary { color: var(--blue); background: var(--paper); border-color: var(--line); }
.button.secondary:hover { border-color: var(--blue); background: var(--blue-light); }
.release-panel { border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 27px; background: var(--canvas); }
.status { display: inline-flex; gap: 8px; align-items: center; margin-bottom: 21px; color: var(--blue); font-size: 13px; font-weight: 600; }
.status::before { content: ""; width: 6px; height: 6px; flex: none; border-radius: 50%; background: currentColor; }
.spec-list { margin: 0; }
.spec-list > div { padding-block: 13px; border-top: 1px solid var(--line); }
.spec-list dt { font-size: 12px; color: var(--muted); }
.spec-list dd { margin: 3px 0 0; color: var(--ink); font-size: 15px; }
.section { padding-block: 58px; border-top: 1px solid var(--line); }
.section-head { display: grid; grid-template-columns: 1fr 1.3fr; gap: 60px; align-items: start; margin-bottom: 30px; }
.section-head h2 { margin-bottom: 0; }
.section-head p { margin-bottom: 0; color: var(--muted); font-size: 15px; }
.feature-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 36px; }
.feature-list article { padding-top: 20px; border-top: 2px solid #c1d5f8; }
.feature-list p { margin-bottom: 0; font-size: 14px; color: var(--body); }
.feature-number { color: var(--blue); font-size: 12px; letter-spacing: .1em; margin-bottom: 13px; }
.version-list { display: grid; gap: 0; margin: 0; }
.version-row { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 30px; border-top: 1px solid var(--line); padding-block: 23px; }
.version-row dt { color: var(--ink); font-weight: 600; }
.version-row dd { margin: 0; font-size: 14px; }
.version-row dd p { margin-bottom: 7px; }
.version-row dd p:last-child { margin-bottom: 0; }
.subtle { color: var(--muted); font-size: 13px; }
.link-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.route-card { position: relative; display: block; padding: 28px 60px 28px 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--canvas); text-decoration: none; }
.route-card::after { content: "→"; position: absolute; right: 27px; top: 29px; font-size: 23px; color: var(--blue); }
.route-card:hover { border-color: #9cb9e8; background: var(--blue-light); }
.route-card h3 { margin-bottom: 8px; }
.route-card p { margin: 0; color: var(--body); font-size: 14px; }
.page-heading { padding-block: 66px 42px; }
.page-heading h1 { margin-bottom: 14px; }
.page-heading .eyebrow { margin-bottom: 14px; }
.page-heading p:last-child { margin-bottom: 0; }
.page-heading .lead { max-width: 740px; font-size: 17px; }
.contact-panel { display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: center; padding: 30px 34px; border: 1px solid #cfdef5; border-radius: var(--radius); background: var(--blue-light); }
.contact-panel h2 { margin-bottom: 6px; font-size: 21px; }
.contact-panel p { margin-bottom: 0; font-size: 14px; }
.email-link { color: var(--blue-dark); font-size: 21px; font-weight: 600; overflow-wrap: anywhere; }
.support-body { max-width: 810px; padding-block: 42px 72px; }
.support-body section { margin-bottom: 42px; }
.support-body section:last-child { margin-bottom: 0; }
.support-body h2 { font-size: 24px; }
.check-list { margin: 0; padding-left: 23px; font-size: 15px; }
.check-list li { padding-left: 5px; margin-bottom: 10px; }
.note { padding: 15px 19px; border-left: 3px solid #a3bee9; background: var(--canvas); border-radius: 0 8px 8px 0; font-size: 14px; }
.note p:last-child { margin: 0; }
.faq-group { margin-top: 22px; }
.faq-group > h3 { margin: 30px 0 14px; color: var(--muted); font-size: 13px; font-weight: 550; letter-spacing: .04em; }
details.faq { border-bottom: 1px solid var(--line); }
details.faq:first-of-type { border-top: 1px solid var(--line); }
details.faq summary { padding: 20px 4px; color: var(--ink); font-size: 15px; font-weight: 550; cursor: pointer; }
details.faq summary::marker { color: var(--blue); }
details.faq[open] summary { color: var(--blue); }
.faq-answer { padding: 0 6px 19px 23px; font-size: 14px; line-height: 1.95; }
.faq-answer p:last-child { margin-bottom: 0; }
.policy-layout { display: grid; grid-template-columns: 195px minmax(0, 1fr); gap: 60px; padding-bottom: 80px; align-items: start; }
.policy-toc { position: sticky; top: 115px; border-top: 1px solid var(--line); padding-top: 15px; }
.policy-toc h2 { margin-bottom: 12px; font-size: 12px; color: var(--muted); font-weight: 550; }
.policy-toc ol { margin: 0; padding: 0; list-style: none; display: grid; gap: 9px; }
.policy-toc a { color: var(--body); text-decoration: none; font-size: 13px; }
.policy-toc a:hover { color: var(--blue); text-decoration: underline; }
.policy { max-width: 720px; color: var(--body); font-size: 15px; line-height: 1.95; }
.policy > section { margin-bottom: 37px; scroll-margin-top: 110px; }
.policy > section:last-child { margin-bottom: 0; }
.policy h2 { margin-bottom: 15px; font-size: 23px; }
.policy h3 { margin-top: 20px; margin-bottom: 10px; font-size: 17px; }
.policy ul, .policy ol { padding-left: 22px; }
.policy li { padding-left: 3px; margin-bottom: 9px; }
.policy .intro { padding-bottom: 24px; margin-bottom: 34px; border-bottom: 1px solid var(--line); }
.policy .intro p:last-child { margin-bottom: 0; }
.policy .note { line-height: 1.9; }
.meta { color: var(--muted); font-size: 13px; }
.site-footer { border-top: 1px solid var(--line); background: var(--canvas); }
.footer-inner { padding-block: 28px; display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; font-size: 12px; color: var(--muted); }
.footer-inner p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 9px 21px; }
.footer-links a { color: var(--body); text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1.2fr 1fr; gap: 36px; }
  .section-head { gap: 32px; }
  .policy-layout { grid-template-columns: 155px minmax(0, 1fr); gap: 32px; }
  .contact-panel { grid-template-columns: 1fr; gap: 15px; }
}
@media (max-width: 680px) {
  html { scroll-padding-top: 135px; }
  .wrap { width: calc(100% - 40px); }
  .header-inner { min-height: 0; padding-top: 17px; flex-wrap: wrap; gap: 4px 20px; }
  .brand-mark { width: 34px; height: 34px; border-radius: 10px; font-size: 19px; }
  .brand-name { font-size: 17px; }
  .site-nav { width: 100%; gap: 25px; }
  .site-nav a { padding-block: 12px 10px; font-size: 13px; }
  .hero { grid-template-columns: 1fr; gap: 32px; padding-block: 45px; }
  .hero h1 { margin-bottom: 17px; }
  .lead { font-size: 16px; }
  .release-panel { padding: 22px; }
  .spec-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 20px; }
  .spec-list dd { font-size: 13px; }
  .section { padding-block: 36px; }
  .section-head { grid-template-columns: 1fr; gap: 15px; margin-bottom: 25px; }
  h2 { font-size: 24px; }
  .feature-list { grid-template-columns: 1fr; gap: 25px; }
  .feature-list article { padding-top: 14px; }
  .feature-number { margin-bottom: 8px; }
  .version-row { grid-template-columns: 1fr; gap: 9px; padding-block: 20px; }
  .link-grid { grid-template-columns: 1fr; gap: 14px; }
  .route-card { padding: 23px 50px 23px 23px; }
  .route-card::after { right: 22px; top: 22px; }
  .page-heading { padding-block: 38px 28px; }
  .page-heading .lead { font-size: 15px; }
  .contact-panel { padding: 24px; }
  .email-link { font-size: 18px; }
  .support-body { padding-block: 32px 48px; }
  .support-body section { margin-bottom: 32px; }
  .policy-layout { grid-template-columns: 1fr; gap: 28px; padding-bottom: 48px; }
  .policy-toc { position: static; }
  .policy-toc ol { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 16px; }
  .policy { font-size: 14px; }
  .policy > section { scroll-margin-top: 135px; }
  .policy h2 { font-size: 21px; }
  .footer-inner { flex-direction: column; gap: 15px; padding-block: 25px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}