:root {
  color: #17223b;
  background: #f5f7fc;
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  font-synthesis: none;
  line-height: 1.65;
  scroll-behavior: smooth;
}
* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: radial-gradient(ellipse at 85% 8%, #e6ebff 0, transparent 44%); }
a { color: inherit; text-decoration: none; }
a:focus-visible, summary:focus-visible { outline: 3px solid #5374e4; outline-offset: 5px; border-radius: 5px; }
.wrap { width: min(1040px, calc(100% - 64px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -90px; z-index: 10; padding: 10px 16px; background: white; }
.skip-link:focus { top: 16px; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-block: 26px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 18px; font-weight: 700; }
img { display: block; object-fit: contain; }
.brand img, .card-heading img { border-radius: 12px; }
.nav-link { font-size: 14px; color: #536078; padding: 8px 0; }
.nav-link:hover, .card-foot a:hover { color: #325acb; }
.hero { display: grid; grid-template-columns: 1.2fr 1fr; align-items: center; gap: 60px; padding-block: 62px 76px; }
.eyebrow { margin: 0 0 15px; color: #5470ae; font-size: 13px; font-weight: 600; letter-spacing: .12em; }
h1 { margin: 0; font-size: clamp(40px, 5vw, 58px); line-height: 1.25; letter-spacing: -.04em; }
.intro { margin: 23px 0 16px; font-size: clamp(22px, 2.5vw, 27px); line-height: 1.55; font-weight: 500; }
.description { max-width: 390px; margin: 0; color: #66728a; font-size: 15px; }
.features { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 25px 0 0; }
.features li { padding: 4px 10px; color: #53617c; font-size: 12px; background: #e9edf6; border-radius: 5px; }
.download-card { padding: 32px; border: 1px solid #e2e7f2; border-radius: 22px; background: #fff; box-shadow: 0 18px 58px #304f9320; }
.card-heading { display: flex; align-items: center; gap: 15px; }
.card-label { margin: 0 0 3px; color: #6f7a91; font-size: 12px; }
h2 { font-size: 24px; line-height: 1.4; margin: 0; letter-spacing: -.025em; }
.card-heading h2 { font-size: 23px; }
.release-status { margin: 26px 0 16px; font-size: 13px; color: #536078; }
.download-button { display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 56px; padding: 10px 14px; border-radius: 10px; background: #315ed8; color: white; font-size: 16px; font-weight: 600; box-shadow: 0 5px 13px #315ed81c; transition: background .15s, transform .15s; }
.download-button span { font-size: 24px; line-height: 1; }
.download-button:hover { background: #254bbb; transform: translateY(-1px); }
.download-meta { text-align: center; color: #758098; font-size: 12px; margin: 13px 0 24px; }
.card-foot { border-top: 1px solid #edf0f6; padding-top: 18px; display: flex; align-items: center; flex-wrap: wrap; gap: 10px 16px; justify-content: space-between; font-size: 11px; color: #6d7890; }
.card-foot a { color: #315ed8; white-space: nowrap; font-size: 12px; }
.guide { padding-block: 30px 40px; border-top: 1px solid #e0e5ef; scroll-margin-top: 24px; }
.section-heading .eyebrow { margin-bottom: 8px; }
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 30px; list-style: none; padding: 0; margin: 28px 0; }
.step-number { display: inline-flex; justify-content: center; align-items: center; width: 36px; height: 36px; border: 1px solid #dce3f1; border-radius: 10px; color: #4262a7; font-size: 12px; font-weight: 600; background: #fff; }
h3 { font-size: 16px; margin: 15px 0 9px; }
.steps p { margin: 0; font-size: 13px; color: #66728a; }
.account-note { display: flex; gap: 10px; align-items: flex-start; font-size: 12px; color: #586987; background: #e9eef9; border-radius: 9px; padding: 14px 17px; margin: 0; }
.account-note > span:first-child { display: inline-flex; align-items: center; justify-content: center; width: 17px; height: 17px; margin-top: 2px; border: 1px solid #8295bb; border-radius: 50%; flex-shrink: 0; font: 12px Georgia, serif; }
.faq { padding-block: 0 32px; }
.faq h2 { font-size: 19px; margin-bottom: 12px; }
details { border-bottom: 1px solid #e0e5ef; }
summary { cursor: pointer; padding-block: 15px; font-size: 13px; font-weight: 500; }
details p { font-size: 13px; color: #66728a; margin: 0 0 16px; }
details a { color: #315ed8; overflow-wrap: anywhere; text-decoration: underline; text-underline-offset: 3px; }
footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; border-top: 1px solid #e0e5ef; padding-block: 24px; color: #8791a5; font-size: 12px; }
@media (max-width: 820px) {
  .hero { gap: 28px; padding-block: 40px 55px; }
  .download-card { padding: 25px; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 32px; }
}
@media (max-width: 620px) {
  .wrap { width: calc(100% - 40px); }
  .site-header { padding-block: 20px; }
  .hero { grid-template-columns: 1fr; gap: 34px; padding-block: 30px 42px; }
  .intro { margin-top: 17px; }
  .download-card { padding: 25px; border-radius: 18px; }
  .features { margin-top: 20px; }
  .guide { padding-top: 25px; }
  .steps { gap: 24px 20px; }
  h2 { font-size: 22px; }
}
@media (prefers-reduced-motion: reduce) {
  :root { scroll-behavior: auto; }
  .download-button { transition: none; }
}