:root { color-scheme: light; --ink: #182237; --muted: #596477; --blue: #304ec4; --line: #e0e5ed; --paper: #f6f8fc; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Microsoft YaHei", sans-serif; line-height: 1.8; }
a { color: var(--blue); text-underline-offset: .22em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 5px; border-radius: 4px; }
img { display: block; max-width: 100%; height: auto; }
figure { margin: 0; }
.wrap { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }
.site-header { border-bottom: 1px solid var(--line); background: #fff; }
.nav { position: relative; padding-right: 44px; display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-block: 18px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-size: 22px; font-weight: 750; letter-spacing: .06em; }
.brand img { width: 40px; height: 40px; }
.nav-links, .footer-links { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; padding-block: 8px; }
.nav-links a[aria-current="page"] { color: var(--blue); }
.skip { position: absolute; top: -100px; left: 24px; background: #fff; padding: 12px; z-index: 1; }
.skip:focus { top: 12px; }
.hero { display: grid; grid-template-columns: 1.3fr 1fr; align-items: center; gap: 80px; padding-block: 72px; }
.eyebrow { color: var(--blue); font-size: 13px; letter-spacing: .12em; font-weight: 700; }
h1, h2, h3 { line-height: 1.4; letter-spacing: -.025em; }
h1 { font-size: clamp(36px, 4.5vw, 62px); margin: 20px 0 24px; }
h2 { font-size: clamp(26px, 3vw, 36px); margin: 0 0 20px; }
h3 { font-size: 20px; margin: 0 0 12px; }
p { margin: 0 0 18px; }
.lead { color: var(--muted); font-size: 18px; max-width: 36em; }
.hero-icon { width: 80px; height: 80px; margin-bottom: 26px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-block; padding: 12px 22px; border: 1px solid var(--line); border-radius: 12px; background: #fff; font-weight: 650; text-decoration: none; }
.button.primary { color: #fff; background: var(--blue); border-color: var(--blue); }
.small, figcaption { color: var(--muted); font-size: 13px; }
.release { margin-top: 20px; }
.phone { width: min(100%, 290px); margin-inline: auto; }
.shot { overflow: hidden; border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 18px 50px #203e7d12; background: #fff; }
figcaption { text-align: center; margin-top: 16px; }
.section { padding-block: 64px; border-top: 1px solid var(--line); }
.section-title { max-width: 620px; margin-bottom: 36px; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.feature { padding-top: 22px; border-top: 2px solid var(--blue); }
.feature p { color: var(--muted); }
.number { display: block; color: var(--blue); font-size: 13px; font-weight: 700; margin-bottom: 20px; }
.devices { display: grid; grid-template-columns: 1.55fr 1fr; align-items: center; gap: 40px; }
.ipad { width: min(100%, 340px); margin-inline: auto; }
.note { margin-top: 32px; padding: 24px 28px; border-left: 3px solid var(--blue); background: #eaf0ff; }
.note p:last-child { margin-bottom: 0; }
.zh { margin-top: 40px; }
.page { max-width: 800px; padding-block: 56px 72px; }
.page h1 { font-size: clamp(32px, 4vw, 44px); }
.page h2 { font-size: 24px; margin-top: 40px; }
.page p, .page li { overflow-wrap: anywhere; }
.language-links { display: flex; gap: 24px; margin-block: 24px 36px; }
.policy section + section { border-top: 1px solid var(--line); margin-top: 56px; padding-top: 32px; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .85em; background: #e9edf5; padding: .15em .3em; overflow-wrap: anywhere; }
details { border-bottom: 1px solid var(--line); padding-block: 20px; }
summary { cursor: pointer; font-weight: 650; }
details p { margin: 16px 0 0; }
.contact { padding-block: 24px; }
.contact a { overflow-wrap: anywhere; }
.site-footer { border-top: 1px solid var(--line); padding-block: 28px; font-size: 13px; }
.footer { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; }
.footer p { margin: 0; color: var(--muted); }
@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; gap: 40px; padding-block: 48px; }
  .hero-copy { max-width: 580px; }
  .features { grid-template-columns: 1fr; gap: 24px; }
  .devices { grid-template-columns: 1fr; gap: 36px; }
  .section { padding-block: 44px; }
  .nav { align-items: flex-start; gap: 16px; }
  .nav-links { justify-content: flex-end; gap: 4px 16px; }
  .phone { width: 250px; }
}
@media (max-width: 400px) {
  .wrap { width: calc(100% - 32px); }
  .nav { flex-wrap: wrap; }
  .nav-links { justify-content: flex-start; }
  .note { padding: 20px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* Native disclosure keeps language choices hidden until requested. */
.language-switch { position: absolute; top: 18px; right: 0; z-index: 2; padding: 0; border: 0; line-height: 1.4; }
.language-switch > summary { display: grid; place-items: center; width: 40px; height: 40px; list-style: none; border-radius: 10px; color: var(--muted); }
.language-switch > summary::-webkit-details-marker { display: none; }
.language-switch > summary:hover, .language-switch[open] > summary { background: var(--paper); color: var(--ink); }
.language-options { position: absolute; top: 48px; right: 0; width: 160px; padding: 6px; border: 1px solid var(--line); border-radius: 12px; background: #fff; box-shadow: 0 8px 28px #18223718; }
.language-options a { display: block; padding: 12px; color: var(--muted); font-size: 14px; text-decoration: none; border-radius: 7px; }
.language-options a:hover, .language-options a[aria-current="true"] { color: var(--blue); background: var(--paper); }
.page > .language-switch { position: relative; top: auto; width: 40px; margin-left: auto; }
.hero-copy { min-width: 0; overflow-wrap: break-word; }