:root {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #172e44;
  background: #f5f8fb;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
body { margin: 0; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
a { color: inherit; }
.page-shell { max-width: 1136px; margin: 0 auto; padding: 0 40px; }
.site-header { display: flex; align-items: center; justify-content: space-between; min-height: 108px; gap: 20px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; text-decoration: none; letter-spacing: -.3px; }
.brand-mark { display: grid; place-items: center; width: 38px; height: 38px; color: #fff; background: #1679df; border-radius: 11px; font-size: 15px; letter-spacing: -1px; }
.brand-caption { font-size: 13px; font-weight: 400; color: #6a7d90; margin-left: 8px; }
.environment { display: flex; align-items: center; gap: 7px; color: #577386; font-size: 12px; white-space: nowrap; }
.environment > span { width: 6px; height: 6px; border-radius: 50%; background: #1caa96; }
.download-card { display: grid; grid-template-columns: 1fr 1fr; background: #fff; border: 1px solid #e2eaf2; border-radius: 24px; box-shadow: 0 12px 45px #27486d08; overflow: hidden; }
.intro { padding: 55px 44px 48px; background: linear-gradient(140deg, #edf6ff, #f4fcfb); display: flex; flex-direction: column; }
.eyebrow { color: #1778ba; font-size: 13px; font-weight: 600; letter-spacing: 1px; }
h1 { font-size: clamp(30px, 3.5vw, 43px); line-height: 1.45; letter-spacing: -1.5px; font-weight: 750; margin: 21px 0 20px; }
.lead { font-size: 15px; color: #587186; line-height: 1.9; max-width: 360px; margin: 0 0 38px; }
.availability { margin-top: auto; display: flex; flex-direction: column; align-items: flex-start; gap: 11px; font-size: 12px; color: #668196; line-height: 1.6; }
.platform-tag { background: #e0f2eb; border: 1px solid #cce8dc; color: #247e66; font-size: 12px; padding: 5px 10px; border-radius: 6px; font-weight: 600; }
.action-panel { padding: 48px 40px 34px; }
.app-identity { display: flex; align-items: center; gap: 15px; margin-bottom: 29px; }
.app-icon { width: 60px; height: 60px; border-radius: 17px; background: linear-gradient(145deg, #278ff0, #156aca); color: white; display: grid; place-items: center; font-size: 22px; font-weight: 700; letter-spacing: -1px; position: relative; flex-shrink: 0; box-shadow: 0 5px 12px #187adc20; }
.app-icon > span { position: absolute; width: 9px; height: 9px; right: 8px; bottom: 9px; border-radius: 3px; background: #76eee0; }
.app-identity h2 { margin: 0 0 7px; font-size: 18px; letter-spacing: -.4px; }
.app-identity p { margin: 0; color: #7a8a99; font-size: 12px; line-height: 1.6; }
.consent { font-size: 13px; line-height: 1.9; color: #637a8d; margin: 0 0 23px; }
#download-button { display: flex; align-items: center; justify-content: center; width: 100%; gap: 16px; min-height: 54px; border: 0; border-radius: 10px; background: #157bdd; color: #fff; font-weight: 600; font-size: 15px; cursor: pointer; transition: background .15s ease, transform .15s ease; }
#download-button:hover:not(:disabled) { background: #096cc7; transform: translateY(-1px); }
#download-button:active:not(:disabled) { transform: translateY(0); }
#download-button:disabled { background: #b3c9dd; cursor: wait; }
#download-button:focus-visible, .brand:focus-visible { outline: 3px solid #55cfc4; outline-offset: 4px; }
.button-arrow { font-size: 20px; font-weight: 400; }
.status-box { display: flex; align-items: flex-start; gap: 9px; margin-top: 15px; padding: 11px 12px; background: #f4f8fc; border-radius: 8px; min-height: 56px; }
.status-dot { width: 6px; height: 6px; background: #6c98bd; border-radius: 50%; margin-top: 7px; flex-shrink: 0; }
.status-box p { margin: 0; font-size: 12px; line-height: 1.8; color: #5d7890; overflow-wrap: anywhere; }
.status-box[data-kind="error"] { background: #fff5ec; }
.status-box[data-kind="error"] .status-dot { background: #c47b2b; }
.status-box[data-kind="error"] p { color: #94622c; }
.status-box[data-kind="ready"] .status-dot, .status-box[data-kind="handoff"] .status-dot { background: #1caa96; }
.platform-note { margin: 14px 0 0; font-size: 11px; line-height: 1.8; color: #8392a1; }
.noscript { color: #a35a18; font-size: 14px; line-height: 1.8; }
.steps-section { margin: 43px 0 30px; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 18px; }
.section-heading h2 { font-size: 18px; margin: 0; font-weight: 650; }
.section-heading p { font-size: 12px; color: #8b99a6; margin: 0; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; list-style: none; margin: 26px 0 0; padding: 0; }
.steps li { border-top: 1px solid #dce6ee; padding-top: 19px; }
.step-number { display: block; font-size: 12px; color: #3e94cc; letter-spacing: 1px; font-weight: 650; margin-bottom: 11px; }
.steps h3 { font-size: 14px; font-weight: 650; margin: 0 0 8px; }
.steps p { margin: 0; color: #728597; font-size: 12px; line-height: 1.85; }
.boundary-note { display: flex; align-items: flex-start; gap: 10px; border-top: 1px solid #e0e8ef; padding-top: 22px; }
.boundary-note > span { display: grid; place-items: center; width: 15px; height: 15px; border: 1px solid #95aaba; border-radius: 50%; font-size: 10px; color: #7a94a8; flex-shrink: 0; margin-top: 2px; }
.boundary-note p { margin: 0; font-size: 12px; color: #8394a2; line-height: 1.8; }
footer { display: flex; justify-content: space-between; gap: 15px; font-size: 11px; color: #98a6b3; margin: 33px 0 28px; }
@media (max-width: 800px) {
  .page-shell { padding: 0 24px; }
  .download-card { grid-template-columns: 1fr; }
  .intro { padding: 34px 30px 28px; }
  h1 { font-size: 34px; line-height: 1.4; }
  .lead { max-width: 520px; margin-bottom: 24px; }
  .availability { flex-direction: row; align-items: center; flex-wrap: wrap; }
  .action-panel { padding: 29px 30px; }
  .site-header { min-height: 88px; }
  .steps { gap: 20px; }
}
@media (max-width: 460px) {
  .page-shell { padding: 0 18px; }
  .site-header { min-height: 79px; gap: 10px; }
  .brand-caption { display: none; }
  .brand { gap: 9px; font-size: 15px; }
  .environment { font-size: 11px; }
  .download-card { border-radius: 18px; }
  .intro, .action-panel { padding: 27px 23px; }
  h1 { font-size: 31px; }
  .lead { font-size: 14px; }
  .app-identity h2 { font-size: 16px; }
  .app-icon { width: 53px; height: 53px; border-radius: 14px; }
  .section-heading { display: block; }
  .section-heading p { margin-top: 8px; }
  .steps { grid-template-columns: 1fr; gap: 19px; margin-top: 21px; }
  .steps li { display: grid; grid-template-columns: 36px 1fr; column-gap: 5px; padding-top: 15px; }
  .step-number { grid-row: span 2; margin-top: 2px; }
  .steps h3 { margin-bottom: 5px; }
  footer { flex-direction: column; gap: 8px; margin-top: 26px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }