:root { font-family: "Microsoft YaHei UI", "Segoe UI", sans-serif; color: #1a2b40; background: #f3f6fb; }
* { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; }
a:focus-visible { outline: 2px solid #2868dc; outline-offset: 4px; }
.page { min-height: 100vh; display: flex; flex-direction: column; width: min(100%, 1200px); margin: auto; padding: 0 40px; }
.site-header { display: flex; align-items: center; min-height: 88px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-size: 17px; font-weight: 800; }
.brand img { width: 40px; height: 40px; }
.hero { flex: 1; display: flex; align-items: center; padding: 48px 0 80px; }
.eyebrow { margin: 0 0 18px; color: #2868dc; font-size: 12px; font-weight: 800; letter-spacing: .15em; }
h1 { max-width: 620px; margin: 0; font-size: clamp(38px, 5vw, 64px); line-height: 1.17; letter-spacing: -.04em; }
.lead { max-width: 550px; margin: 24px 0 32px; color: #50627b; font-size: 16px; line-height: 1.9; }
.download-button { display: inline-flex; align-items: center; justify-content: center; gap: 20px; min-height: 54px; padding: 12px 22px; border-radius: 14px; color: #fff; background: #2868dc; text-decoration: none; font-size: 15px; font-weight: 800; box-shadow: 0 12px 24px #2868dc30; }
.download-button:hover { background: #1959cb; }
.download-button span { font-size: 20px; line-height: 1; }
.download-hint { margin: 16px 0 0; color: #718198; font-size: 12px; line-height: 1.7; }
footer { padding: 20px 0 28px; border-top: 1px solid #dfe7f0; color: #8a98aa; font-size: 12px; }
@media (max-width: 800px) {
  .page { padding: 0 24px; }
  .hero { padding: 60px 0; }
}
@media (max-width: 480px) {
  .page { padding: 0 18px; }
  .site-header { min-height: 72px; }
  .brand { gap: 8px; font-size: 14px; }
  .brand img { width: 34px; height: 34px; }
  .hero { padding: 44px 0 56px; }
  .lead { font-size: 14px; }
  .download-button { width: 100%; }
}