:root {
  color-scheme: light;
  --background: #f4f7fc;
  --surface: #ffffff;
  --ink: #192c49;
  --muted: #5b6f8a;
  --blue: #2b67eb;
  --blue-dark: #2153c5;
  --line: #dee6f2;
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  font-size: 16px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--background); color: var(--ink); line-height: 1.75; }
a { color: var(--blue-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.35; }
p { color: var(--muted); }
:focus-visible { outline: 3px solid #2b67eb; outline-offset: 5px; }
.container { width: min(1160px, calc(100% - 64px)); margin: 0 auto; min-width: 0; }
.skip-link { position: absolute; top: -100px; left: 16px; z-index: 3; padding: 10px 16px; background: white; border: 1px solid var(--blue); border-radius: 6px; }
.skip-link:focus { top: 10px; }
.site-header { background: var(--surface); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 28px; padding: 16px 0; }
.site-brand { display: flex; align-items: center; gap: 11px; font-size: 25px; font-weight: 800; line-height: 1.2; color: var(--ink); }
.site-brand:hover { text-decoration: none; }
.brand-mark { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; background: #cf471e; color: white; font-size: 26px; }
.site-brand small { display: block; margin-top: 5px; font-size: 11px; font-weight: 400; letter-spacing: .03em; color: var(--muted); }
nav { display: flex; flex-wrap: wrap; gap: 10px 26px; font-size: 14px; }
nav a { padding: 9px 0; color: var(--muted); }
nav a[aria-current="page"] { color: var(--blue-dark); font-weight: 700; border-bottom: 2px solid var(--blue); }
.hero { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); align-items: center; gap: 64px; padding: 70px 0 60px; }
.hero > *, .source-section > *, .notes-grid > *, .feature-strip > * { min-width: 0; }
.release-tag { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 6px 11px; margin-bottom: 24px; border: 1px solid #d5e2ff; border-radius: 5px; color: var(--blue-dark); background: #eaf1ff; font-size: 12px; font-weight: 600; }
.release-tag > span:last-child { margin-left: 5px; font-variant-numeric: tabular-nums; }
.status-dot { width: 6px; height: 6px; background: var(--blue); border-radius: 50%; }
.hero h1 { margin-bottom: 17px; font-size: clamp(34px, 3.7vw, 48px); font-weight: 800; letter-spacing: -.04em; }
.hero-line { margin-bottom: 18px; color: var(--ink); font-size: 27px; line-height: 1.5; font-weight: 500; }
.hero-description { max-width: 490px; margin-bottom: 20px; font-size: 15px; line-height: 1.9; }
.platform-meta { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-bottom: 28px; font-size: 12px; color: var(--muted); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 50px; max-width: 100%; padding: 12px 22px; border-radius: 7px; font-size: 15px; font-weight: 650; text-align: center; line-height: 1.5; }
.button:hover { text-decoration: none; }
.button-primary { background: var(--blue); color: white; box-shadow: 0 7px 20px #2b67eb20; }
.button-primary:hover { background: var(--blue-dark); }
.button-primary > span { font-size: 22px; line-height: 1; }
.button-secondary { border: 1px solid #cad9f4; background: white; color: var(--blue-dark); white-space: nowrap; }
.button-secondary:hover { background: #eff4ff; }
.download-caption { margin: 10px 0 18px; font-size: 11px; }
.text-link { font-size: 13px; font-weight: 600; }
.release-card { padding: 30px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 18px 50px #19315d0a; }
.app-identity { display: flex; align-items: center; gap: 15px; padding-bottom: 24px; }
.app-identity img { flex: 0 0 64px; }
.app-identity > div { min-width: 0; }
.app-identity h2 { margin-bottom: 5px; font-size: 19px; }
.app-identity p { margin: 0; font-size: 12px; }
.release-facts { margin: 0; padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 13px; }
.release-facts > div { display: grid; grid-template-columns: 105px minmax(0, 1fr); gap: 12px; padding: 6px 0; }
.release-facts dt { color: var(--muted); }
.release-facts dd { margin: 0; font-weight: 500; overflow-wrap: anywhere; }
.small-tag { display: inline-block; margin-left: 6px; padding: 1px 6px; font-size: 10px; color: var(--blue-dark); background: #edf3ff; border-radius: 3px; }
.file-links { display: grid; margin-top: 18px; }
.file-links a { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; font-size: 13px; }
.signature-note { margin: 14px 0 0; font-size: 11px; color: var(--muted); line-height: 1.85; }
.feature-strip { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 35px; padding: 30px 0 36px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-number { display: block; margin-bottom: 12px; font-size: 12px; color: var(--blue-dark); font-weight: 700; }
.feature-strip h2 { margin-bottom: 9px; font-size: 17px; }
.feature-strip p { margin-bottom: 0; font-size: 13px; line-height: 1.95; }
.getting-started { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 80px; padding: 64px 0; scroll-margin-top: 24px; }
.section-kicker { display: block; color: var(--blue-dark); font-size: 12px; font-weight: 650; margin-bottom: 11px; }
.section-heading h2 { font-size: 27px; margin-bottom: 13px; }
.section-heading p { font-size: 14px; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 26px; }
.steps li { display: flex; align-items: flex-start; gap: 17px; }
.step-number { flex: 0 0 32px; height: 32px; display: grid; place-items: center; border: 1px solid #d3dff5; border-radius: 50%; background: #eaf1ff; color: var(--blue-dark); font-size: 13px; font-weight: 700; }
.steps li > div { min-width: 0; }
.steps h3 { margin: 2px 0 6px; font-size: 16px; }
.steps p { margin: 0; font-size: 13px; line-height: 1.95; }
.test-notes { padding: 31px; border: 1px solid var(--line); border-radius: 12px; background: #edf2fa; }
.test-notes .section-heading h2 { font-size: 23px; margin-bottom: 24px; }
.notes-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 30px; }
.notes-grid h3 { margin-bottom: 10px; font-size: 15px; }
.notes-grid p { margin: 0; font-size: 12px; line-height: 1.95; }
.source-section { display: flex; align-items: center; justify-content: space-between; gap: 46px; padding: 43px 0; }
.source-section h2 { margin-bottom: 11px; font-size: 19px; }
.source-section p { margin: 0; max-width: 700px; font-size: 13px; line-height: 1.9; }
.source-section p a { text-decoration: underline; text-underline-offset: 3px; }
.checksums { margin-bottom: 58px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 13px; }
.checksums summary { padding: 18px 0; cursor: pointer; font-weight: 600; }
.checksums summary > span { margin-left: 10px; color: var(--muted); font-size: 11px; font-weight: 400; }
.checksum-body { padding-bottom: 22px; }
.checksum-body > p { margin-bottom: 18px; font-size: 12px; }
.checksum-body dl { margin: 0; display: grid; gap: 18px; }
.checksum-body dt { margin-bottom: 6px; font-size: 12px; font-weight: 600; }
.checksum-body dd { margin: 0; }
.checksum-body code { display: block; max-width: 100%; padding: 10px 12px; background: #e9eef7; border: 1px solid var(--line); border-radius: 5px; font-size: 12px; line-height: 1.8; white-space: normal; overflow-wrap: anywhere; user-select: all; }
.checksum-links { display: flex; flex-wrap: wrap; gap: 12px 26px; margin-top: 18px; font-size: 12px; }
.site-footer { background: var(--surface); border-top: 1px solid var(--line); }
.footer-inner { display: flex; flex-wrap: wrap; gap: 10px 28px; justify-content: space-between; padding: 24px 0; color: var(--muted); font-size: 11px; }
@media (max-width: 900px) {
  .hero { gap: 30px; padding: 48px 0; }
  .hero-line { font-size: 23px; }
  .release-card { padding: 22px; }
  .app-identity { gap: 12px; }
  .app-identity img { width: 50px; flex-basis: 50px; }
  .app-identity h2 { font-size: 16px; }
  .release-facts > div { grid-template-columns: 88px minmax(0, 1fr); }
  .getting-started { gap: 40px; }
  .notes-grid { gap: 22px; }
}
@media (max-width: 680px) {
  .container { width: calc(100% - 40px); }
  .header-inner { flex-wrap: wrap; gap: 13px; min-height: 0; }
  .site-brand { font-size: 23px; }
  nav { width: 100%; gap: 22px; font-size: 13px; }
  nav a { padding: 7px 0; }
  .hero { grid-template-columns: minmax(0, 1fr); gap: 34px; padding: 36px 0; }
  .release-tag { margin-bottom: 20px; }
  .hero h1 { font-size: 33px; letter-spacing: -.04em; }
  .hero-line { font-size: 25px; }
  .hero-description { font-size: 14px; }
  .platform-meta { gap: 7px 17px; margin-bottom: 22px; }
  .button-primary { width: 100%; }
  .download-caption { font-size: 11px; }
  .release-card { padding: 22px; }
  .app-identity img { width: 56px; flex-basis: 56px; }
  .app-identity h2 { font-size: 17px; }
  .release-facts > div { grid-template-columns: 100px minmax(0, 1fr); }
  .feature-strip { grid-template-columns: minmax(0, 1fr); gap: 25px; padding: 28px 0; }
  .feature-number { float: left; margin: 3px 15px 0 0; }
  .feature-strip h2 { font-size: 16px; }
  .feature-strip p { margin-left: 31px; }
  .getting-started { grid-template-columns: minmax(0, 1fr); gap: 24px; padding: 40px 0; }
  .section-heading h2 { font-size: 25px; }
  .section-heading p { margin-bottom: 0; }
  .steps { gap: 24px; }
  .test-notes { padding: 23px 20px; }
  .notes-grid { grid-template-columns: minmax(0, 1fr); gap: 25px; }
  .notes-grid p { font-size: 13px; }
  .source-section { flex-direction: column; align-items: stretch; gap: 23px; padding: 33px 0; }
  .button-secondary { white-space: normal; }
  .checksums { margin-bottom: 35px; }
  .footer-inner { justify-content: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}