:root {
  --ink: #111;
  --ink-soft: #333;
  --muted: #707070;
  --surface: #fff;
  --line: #e8e8e8;
  --max: 1040px;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 90px; }
body { margin: 0; background: #fff; color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif; font-size: 15px; line-height: 1.7; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 2px solid #111; outline-offset: 4px; }
h1, h2, h3, p { margin: 0; }
h1 { font-size: clamp(30px, 3.5vw, 40px); font-weight: 600; line-height: 1.4; letter-spacing: -.035em; }
h2 { font-size: 25px; font-weight: 600; line-height: 1.5; }
h3 { font-size: 17px; font-weight: 600; }
.site-header { position: sticky; top: 0; z-index: 20; height: 72px; display: flex; align-items: center; gap: 36px; padding: 0 max(24px, calc((100% - var(--max)) / 2)); border-bottom: 1px solid var(--line); background: #fff; }
.brand { display: inline-flex; align-items: center; gap: 8px; flex-shrink: 0; }
.brand-mark { width: 30px; height: 34px; }
.brand-mark img { display: block; width: 100%; height: 100%; filter: grayscale(1) brightness(0); }
.brand-copy strong { font-size: 19px; font-weight: 600; }
.site-nav { display: flex; align-items: center; gap: 28px; margin-left: auto; color: #666; font-size: 14px; }
.site-nav a:hover, .site-nav a[aria-current] { color: #111; }
.header-download, .btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid #111; border-radius: 5px; background: #111; color: #fff; white-space: nowrap; font-size: 14px; font-weight: 500; }
.header-download { min-height: 36px; padding: 0 14px; }
.btn { min-height: 46px; padding: 0 22px; }
.header-download:hover, .btn:hover { background: #333; border-color: #333; }
.page-content { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) 310px; align-items: center; gap: 64px; padding: 64px 0 56px; }
.eyebrow { margin-bottom: 16px; color: #777; font-size: 13px; font-weight: 400; letter-spacing: .05em; }
.hero-description { max-width: 470px; margin: 20px 0 0; color: #666; font-size: 15px; line-height: 1.9; }
.hero-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 26px; color: #333; font-size: 14px; }
.hero-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.download-card { padding: 26px; border: 1px solid #e5e5e5; border-radius: 10px; background: #fff; }
.download-platform { margin-bottom: 6px; color: #777; font-size: 12px; }
.download-card h2 { font-size: 23px; }
.download-facts { margin: 22px 0; font-size: 12px; }
.download-facts div { display: flex; justify-content: space-between; gap: 12px; margin-top: 9px; }
.download-facts dt { color: #777; }
.download-facts dd { margin: 0; color: #333; }
.download-card .btn { width: 100%; }
.download-card .btn svg { display: block; width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.install-link { display: block; margin-top: 12px; color: #777; font-size: 12px; text-align: center; }
.install-link:hover { color: #111; }
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; padding: 36px 0 42px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.features p { margin-top: 10px; color: #777; font-size: 14px; }
.section { padding: 60px 0; border-bottom: 1px solid var(--line); }
.section-intro { margin-top: 10px; color: #777; font-size: 14px; }
.download-section { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.download-notes { padding-left: 20px; margin: 0; color: #666; font-size: 14px; }
.download-notes li + li { margin-top: 12px; }
.product-crosslink { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 32px 0; color: #777; font-size: 14px; }
.text-link { color: #111; text-decoration: underline; text-underline-offset: 4px; }
.site-footer { width: min(var(--max), calc(100% - 48px)); display: flex; flex-wrap: wrap; align-items: center; gap: 24px; margin: 28px auto 0; padding: 24px 0; border-top: 1px solid var(--line); color: #888; font-size: 12px; }
.site-footer > span { margin-right: auto; }
.site-footer a:hover { color: #111; }
@media (max-width: 800px) {
  .site-header { gap: 22px; }
  .site-nav { gap: 20px; }
  .site-nav > a { display: none; }
  .hero { grid-template-columns: minmax(0, 1fr) 280px; gap: 32px; padding: 48px 0; }
  .download-card { padding: 22px; }
  .features { gap: 24px; }
  .download-section { gap: 36px; }
}
@media (max-width: 600px) {
  .site-header { height: 64px; padding: 0 20px; gap: 18px; }
  .brand-mark { width: 24px; height: 28px; }
  .brand-copy strong { font-size: 17px; }
  .site-nav { font-size: 13px; }
  .header-download { min-height: 34px; padding: 0 10px; font-size: 12px; }
  .page-content, .site-footer { width: calc(100% - 40px); }
  .hero { grid-template-columns: 1fr; gap: 28px; padding: 36px 0; }
  h1 { font-size: 30px; }
  h2 { font-size: 22px; }
  .hero-description { font-size: 14px; }
  .features { grid-template-columns: 1fr; gap: 24px; padding: 28px 0; }
  .features p { margin-top: 6px; }
  .section { padding: 36px 0; }
  .download-section { grid-template-columns: 1fr; gap: 28px; }
  .product-crosslink { align-items: flex-start; flex-direction: column; gap: 10px; }
  .site-footer { gap: 12px 20px; }
  .site-footer > span { width: 100%; }
}