:root {
  --canvas: #f4f6fa;
  --paper: #ffffff;
  --ink: #172033;
  --muted: #637087;
  --line: #dce2ec;
  --blue: #2457d6;
  --amber: #855c20;
  --danger: #a33f3f;
  color-scheme: light;
  font-family: "Aptos", "Segoe UI Variable", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  color: var(--ink);
  background: var(--canvas);
}
* { box-sizing: border-box; }
html { min-width: 320px; background: var(--canvas); }
body { min-width: 320px; min-height: 100vh; margin: 0; background: var(--canvas); color: var(--ink); }
button { font: inherit; }
::selection { background: #cddaff; color: #132653; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
.skip-link { position: fixed; z-index: 10; top: 10px; left: 10px; padding: 10px 14px; background: var(--paper); color: var(--ink); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.site-header { display: flex; align-items: center; justify-content: space-between; min-height: 76px; padding: 0 clamp(20px, 5vw, 72px); border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .78); }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); font-size: 15px; font-weight: 700; text-decoration: none; }
.brand img { width: 82px; height: 38px; object-fit: contain; }
.platform { display: inline-flex; align-items: center; gap: 9px; color: var(--muted); font-size: 13px; }
.platform i { width: 7px; height: 7px; border-radius: 50%; background: var(--blue); }
.download-shell { display: grid; grid-template-columns: minmax(0, 1fr) minmax(330px, 420px); gap: clamp(56px, 8vw, 120px); align-items: center; width: min(1120px, calc(100% - 40px)); min-height: calc(100vh - 144px); margin: 0 auto; padding: 64px 0; }
.intro { min-width: 0; }
.intro h1 { max-width: 720px; margin: 0; font-size: clamp(42px, 5.8vw, 72px); font-weight: 740; line-height: 1.08; letter-spacing: -.035em; text-wrap: balance; }
.summary { max-width: 610px; margin: 24px 0 0; color: var(--muted); font-size: 17px; line-height: 1.75; }
.feature-list { display: grid; gap: 0; max-width: 620px; margin: 38px 0 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.feature-list li { display: grid; grid-template-columns: 28px 1fr; gap: 15px; align-items: center; padding: 17px 0; border-bottom: 1px solid var(--line); }
.feature-list svg { width: 22px; height: 22px; fill: none; stroke: var(--blue); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.feature-list strong, .feature-list small { display: block; }
.feature-list strong { font-size: 15px; }
.feature-list small { margin-top: 4px; color: var(--muted); font-size: 13px; line-height: 1.5; }
.system-note { max-width: 620px; margin: 24px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.system-note strong { color: var(--ink); }
.future-note { margin: 8px 0 0; color: var(--muted); font-size: 13px; }
.release-card { padding: 28px; border-radius: 16px; background: var(--paper); box-shadow: 0 24px 64px -38px rgba(31, 45, 72, .48); }
.release-heading { display: grid; grid-template-columns: 42px 1fr auto; gap: 13px; align-items: center; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.windows-mark { display: grid; grid-template-columns: repeat(2, 10px); gap: 2px; width: 42px; height: 42px; padding: 10px; border-radius: 10px; background: var(--blue); transform: skewY(-3deg); }
.windows-mark i { width: 10px; height: 10px; background: #fff; }
.release-heading h2 { margin: 0; font-size: 18px; }
.release-heading p { margin: 4px 0 0; color: var(--muted); font-size: 12px; }
.release-badge { padding: 6px 9px; border-radius: 7px; background: #f6ead8; color: var(--amber); font-size: 12px; font-weight: 700; }
.release-badge.is-ready { background: #e5f3eb; color: #276247; }
.release-badge.is-preview { background: #f6ead8; color: var(--amber); }
.release-data { margin: 18px 0 22px; }
.release-data div { display: flex; justify-content: space-between; gap: 20px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.release-data dt { color: var(--muted); font-size: 13px; }
.release-data dd { margin: 0; font-size: 13px; font-weight: 650; font-variant-numeric: tabular-nums; }
.download-button { display: grid; grid-template-columns: 24px 1fr; gap: 13px; align-items: center; width: 100%; min-height: 68px; padding: 12px 16px; border: 0; border-radius: 10px; background: #e8ecf2; color: #596679; text-align: left; cursor: not-allowed; }
.download-button.is-ready { background: var(--blue); color: #fff; cursor: pointer; box-shadow: 0 14px 30px -18px rgba(36, 87, 214, .8); }
.download-button svg { width: 23px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.download-button strong, .download-button small { display: block; }
.download-button strong { font-size: 14px; }
.download-button small { margin-top: 4px; font-size: 12px; line-height: 1.45; }
.release-note { margin: 14px 0 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
.release-note.is-warning { color: var(--amber); font-weight: 650; }
.release-note.is-error { color: var(--danger); }
.checksum { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.checksum summary { cursor: pointer; }
.checksum div { display: grid; gap: 10px; margin-top: 12px; }
.checksum code { overflow-wrap: anywhere; color: var(--ink); font-size: 11px; }
.checksum button { justify-self: start; padding: 7px 10px; border: 1px solid var(--line); border-radius: 7px; background: var(--paper); color: var(--blue); cursor: pointer; }
.site-footer { display: flex; justify-content: space-between; gap: 20px; min-height: 68px; padding: 22px clamp(20px, 5vw, 72px); border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
@media (max-width: 860px) {
  .download-shell { grid-template-columns: 1fr; gap: 44px; width: min(680px, calc(100% - 40px)); min-height: auto; }
  .release-card { width: 100%; }
}
@media (max-width: 620px) {
  .site-header { min-height: 68px; padding-inline: 18px; }
  .brand img { width: 68px; }
  .brand span { display: none; }
  .platform { font-size: 12px; }
  .download-shell { width: calc(100% - 32px); padding: 46px 0; }
  .intro h1 { font-size: clamp(38px, 12vw, 54px); }
  .summary { margin-top: 20px; font-size: 15px; }
  .feature-list { margin-top: 30px; }
  .release-card { padding: 22px 18px; }
  .release-heading { grid-template-columns: 40px 1fr auto; gap: 10px; }
  .windows-mark { width: 40px; height: 40px; padding: 9px; }
  .release-heading h2 { font-size: 16px; }
  .release-heading p { font-size: 11px; }
  .release-badge { font-size: 11px; }
  .site-footer { padding-inline: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}