:root {
  color-scheme: light;
  --paper: #f8f9f7;
  --surface: #ffffff;
  --ink: #18253b;
  --muted: #57667c;
  --blue: #315bd5;
  --blue-deep: #2448ad;
  --line: #dfe5ec;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.65;
}
a { color: var(--blue-deep); text-underline-offset: .18em; }
a:hover { color: var(--blue); }
a:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; border-radius: 3px; }
.shell { width: min(100% - 48px, 1080px); margin-inline: auto; }
.site-header { border-bottom: 1px solid var(--line); }
.site-header .shell { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { color: var(--ink); font-size: 1.1rem; font-weight: 720; letter-spacing: -.035em; text-decoration: none; white-space: nowrap; }
.nav { display: flex; flex-wrap: wrap; gap: 10px 26px; font-size: .92rem; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--blue-deep); }
.root-main { min-height: calc(100dvh - 150px); display: grid; align-content: center; padding-block: 88px; }
.eyebrow { margin: 0 0 16px; color: var(--blue-deep); font-size: .76rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.13; letter-spacing: -.04em; }
h1 { margin: 0; font-size: clamp(3.4rem, 9vw, 6.8rem); font-weight: 720; }
.root-intro { max-width: 36rem; margin: 22px 0 40px; color: var(--muted); font-size: clamp(1.15rem, 2.3vw, 1.45rem); }
.root-store { margin: 8px 0 0; font-size: .9rem; }
.root-store a { color: var(--muted); text-decoration: none; }
.root-store a:hover { color: var(--blue-deep); }
.text-link { display: inline-flex; align-items: center; gap: 12px; font-weight: 650; text-decoration: none; }
.text-link::after { content: "↗"; font-size: 1.1em; }
.hero { padding-block: clamp(72px, 7vw, 104px) 104px; }
.hero h1 { max-width: 850px; }
.hero .zh { display: block; margin-top: 18px; color: var(--blue-deep); font-size: clamp(1.45rem, 3vw, 2.2rem); font-weight: 560; letter-spacing: -.045em; }
.hero-copy { max-width: 650px; margin: 32px 0 0; color: var(--muted); font-size: clamp(1.13rem, 2vw, 1.37rem); line-height: 1.85; }
.hero-install { margin-top: 32px; }
.store-button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 9px 23px; border-radius: 10px; background: var(--blue); color: #fff; font-size: .98rem; font-weight: 650; text-decoration: none; }
.store-button:hover { background: var(--blue-deep); color: #fff; }
.store-meta { margin: 9px 0 0; color: var(--muted); font-size: .83rem; }
.product-section { border-top: 1px solid var(--line); padding-block: 64px 78px; }
.section-grid { display: grid; grid-template-columns: minmax(180px, .65fr) minmax(0, 1.35fr); gap: clamp(30px, 8vw, 100px); }
.section-grid h2 { margin: 0; font-size: 1.6rem; }
.feature-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 40px; margin: 0; padding: 0; list-style: none; }
.feature-list li { padding: 16px 0; border-top: 1px solid var(--line); font-size: 1.08rem; }
.disclosure { max-width: 620px; margin: 0; color: var(--muted); font-size: 1.05rem; }
.disclosure + .disclosure { margin-top: 18px; }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); }
.site-footer .shell { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 16px; font-size: .9rem; }
.site-footer p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px 24px; }
.content-page { width: min(100% - 48px, 720px); margin: 0 auto; padding-block: 72px 110px; }
.content-page h1 { font-size: clamp(2.55rem, 6vw, 4.1rem); }
.page-lead { margin: 18px 0 52px; color: var(--muted); font-size: 1.08rem; }
.policy { overflow-wrap: anywhere; }
.policy h2 { margin: 54px 0 18px; font-size: 1.55rem; }
.policy p { margin: 0 0 18px; }
.policy ul { padding-left: 1.4rem; }
.policy li { margin: 8px 0; }
.policy code { font-size: .92em; background: #edf1f5; padding: .13em .34em; border-radius: 4px; }
.support-topics { margin: 0 0 36px; padding-left: 1.3rem; }
.support-topics li { margin: 8px 0; }
.support-store { margin: 0 0 34px; font-size: .95rem; }
.contact-block { border-top: 1px solid var(--line); padding-top: 28px; }
.contact-block p { margin: 0 0 10px; }
@media (max-width: 680px) {
  .shell, .content-page { width: min(100% - 36px, 1080px); }
  .site-header .shell { min-height: 68px; align-items: flex-start; flex-direction: column; justify-content: center; padding-block: 13px; gap: 6px; }
  .nav { gap: 8px 18px; }
  .root-main { min-height: calc(100dvh - 150px); }
  .hero { padding-block: 78px 80px; }
  .section-grid { grid-template-columns: 1fr; gap: 26px; }
  .feature-list { grid-template-columns: 1fr; }
  .site-footer .shell { align-items: flex-start; flex-direction: column; padding-block: 22px; }
  .content-page { padding-block: 56px 85px; }
}