:root {
  color-scheme: light;
  --paper: #faf9f5;
  --ink: #292929;
  --muted: #66655e;
  --red: #b83b29;
  --yellow: #fbad43;
  --line: #dedcd4;
  --cream: #f8edd7;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 110px; }
body { margin: 0; line-height: 1.7; }
html[data-lang="en"] [data-language="zh"],
html[data-lang="zh"] [data-language="en"] { display: none !important; }
a { color: inherit; text-underline-offset: 4px; }
a:hover { color: var(--red); }
a, summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--red); outline-offset: 5px; border-radius: 3px; }
img { max-width: 100%; display: block; height: auto; }
figure, h1, h2, h3, p { margin: 0; }
h1, h2, h3 { line-height: 1.25; text-wrap: balance; }
.container { width: min(1120px, calc(100% - 80px)); margin-inline: auto; }
.skip-link { position: absolute; left: 16px; top: -100px; z-index: 20; padding: 10px 18px; background: white; }
.skip-link:focus { top: 10px; }
.site-header { position: sticky; top: 0; z-index: 10; background: var(--paper); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; flex-shrink: 0; }
.brand img { width: 44px; height: 44px; border-radius: 11px; }
.brand-name { font-size: 18px; font-weight: 650; letter-spacing: -.4px; }
.header-actions, .site-nav, .language-switch { display: flex; align-items: center; }
.header-actions { gap: 32px; }
.site-nav { gap: 28px; font-size: 14px; }
.site-nav a { text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
.language-switch { padding: 3px; border: 1px solid var(--line); border-radius: 100px; }
.language-switch a { min-height: 38px; min-width: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 3px 11px; border-radius: 100px; font-size: 12px; font-weight: 600; text-decoration: none; }
.language-switch a[aria-current="true"] { color: white; background: var(--ink); }
.eyebrow { color: var(--red); font-size: 12px; font-weight: 650; letter-spacing: .13em; text-transform: uppercase; }
.hero { display: grid; grid-template-columns: 1.08fr 1fr; align-items: center; gap: 28px; min-height: 690px; padding-block: 70px 60px; }
.hero h1 { margin-top: 24px; font-family: ui-serif, "Songti SC", "STSong", Georgia, serif; font-weight: 550; font-size: clamp(44px, 5.15vw, 66px); letter-spacing: -.045em; line-height: 1.18; }
.hero h1 em { font-style: normal; color: var(--red); }
.hero-description { margin-top: 26px; max-width: 420px; color: var(--muted); font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 22px; margin-top: 30px; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 20px; min-height: 50px; padding: 12px 23px; border-radius: 8px; background: var(--yellow); font-size: 14px; font-weight: 600; text-decoration: none; }
.button:hover { background: #f5a433; color: var(--ink); }
.text-link { font-size: 14px; font-weight: 550; }
.hero-meta { display: flex; gap: 12px; margin-top: 26px; color: var(--muted); font-size: 12px; }
.hero-meta > span + span::before { content: "·"; margin-right: 12px; }
.product-figure { position: relative; width: 100%; max-width: 480px; height: 558px; margin-left: auto; }
.product-figure::before { content: ""; position: absolute; width: 420px; height: 420px; max-width: 98%; background: #f3e5c9; border-radius: 50%; top: 60px; left: 10px; }
.phone { position: absolute; border: 6px solid #373531; border-radius: 35px; overflow: hidden; background: #f0f0ee; box-shadow: 0 20px 35px -22px #39302070; }
.phone img { width: 100%; }
.phone-back { width: 196px; top: 38px; left: 10px; transform: rotate(-7deg); }
.phone-front { width: 236px; right: 15px; top: 8px; transform: rotate(5deg); }
.product-figure figcaption { position: absolute; bottom: 0; left: 0; width: 100%; text-align: center; color: var(--muted); font-size: 11px; letter-spacing: .03em; }
.section { padding-block: 80px; border-top: 1px solid var(--line); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.section-heading h2 { margin-top: 14px; font-size: clamp(28px, 3.2vw, 38px); font-weight: 600; letter-spacing: -.04em; }
.section-heading > p { max-width: 340px; color: var(--muted); font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 44px; margin-top: 48px; }
.feature-number { display: block; color: var(--red); font-family: ui-serif, Georgia, serif; font-size: 30px; margin-bottom: 25px; }
.feature-grid h3 { font-size: 20px; font-weight: 600; letter-spacing: -.02em; }
.feature-grid p { color: var(--muted); font-size: 14px; margin-top: 16px; line-height: 1.9; }
.feature-note { margin-top: 34px; color: var(--muted); font-size: 12px; }
.privacy-band { display: grid; grid-template-columns: 90px 1fr auto; gap: 34px; align-items: center; background: var(--cream); padding: 42px; border-radius: 12px; margin-bottom: 80px; }
.privacy-band img { width: 90px; border-radius: 22px; }
.privacy-band h2 { font-size: 25px; font-weight: 600; letter-spacing: -.03em; }
.privacy-band p { margin-top: 12px; color: var(--muted); max-width: 580px; font-size: 14px; }
.privacy-band .text-link { white-space: nowrap; }
.support { display: grid; grid-template-columns: .86fr 1.3fr; gap: 80px; }
.support h2 { margin-top: 14px; font-size: 38px; font-weight: 600; letter-spacing: -.04em; }
.support-intro { margin-top: 20px; color: var(--muted); font-size: 15px; }
.support-email { display: inline-block; margin-top: 22px; color: var(--red); font-size: clamp(16px, 1.9vw, 21px); font-weight: 550; overflow-wrap: anywhere; }
.support-note { margin-top: 18px; font-size: 12px; color: var(--muted); max-width: 330px; }
.faq-heading { font-size: 18px; margin-bottom: 16px; }
details { border-top: 1px solid var(--line); }
details:last-child { border-bottom: 1px solid var(--line); }
summary { position: relative; padding: 20px 30px 20px 0; min-height: 60px; cursor: pointer; list-style: none; font-size: 15px; font-weight: 550; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-size: 22px; font-weight: 400; position: absolute; right: 3px; top: 14px; }
details[open] summary::after { content: "−"; }
details p { padding: 0 28px 22px 0; color: var(--muted); font-size: 14px; line-height: 1.85; }
details p a { color: var(--red); }
.site-footer { border-top: 1px solid var(--line); padding-block: 28px; }
.footer-inner { display: flex; justify-content: space-between; align-items: start; gap: 24px; color: var(--muted); font-size: 11px; }
.footer-name { color: var(--ink); font-size: 13px; font-weight: 600; margin-bottom: 5px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; font-size: 12px; }
.footer-links a { display: inline-flex; align-items: center; min-height: 44px; }
.policy-header { padding-block: 64px 44px; }
.back-link { color: var(--muted); font-size: 13px; }
.policy-header .eyebrow { margin-top: 42px; }
.policy-header h1 { font-family: ui-serif, "Songti SC", "STSong", Georgia, serif; font-size: clamp(40px, 5vw, 58px); font-weight: 550; letter-spacing: -.04em; margin-top: 14px; }
.policy-date { font-size: 13px; color: var(--muted); margin-top: 18px; }
.policy-layout { display: grid; grid-template-columns: 220px minmax(0, 740px); justify-content: space-between; gap: 60px; padding-bottom: 90px; }
.policy-toc { align-self: start; position: sticky; top: 125px; padding-top: 8px; }
.policy-toc p { font-size: 11px; letter-spacing: .12em; color: var(--red); margin-bottom: 14px; text-transform: uppercase; }
.policy-toc a { display: block; padding-block: 8px; text-decoration: none; font-size: 13px; color: var(--muted); }
.policy-toc a:hover { color: var(--red); }
.policy-summary { border-left: 3px solid var(--yellow); background: var(--cream); padding: 24px 28px; border-radius: 0 8px 8px 0; margin-bottom: 34px; }
.policy-summary h2 { font-size: 21px; margin-bottom: 12px; }
.policy-body p, .policy-body li { font-size: 15px; line-height: 1.95; }
.policy-body p + p { margin-top: 15px; }
.policy-body section { padding-top: 32px; margin-top: 30px; border-top: 1px solid var(--line); }
.policy-body section h2 { font-size: 23px; font-weight: 600; letter-spacing: -.025em; margin-bottom: 18px; }
.policy-body ul { padding-left: 22px; margin: 12px 0; }
.policy-body li + li { margin-top: 8px; }
.policy-body a { color: var(--red); overflow-wrap: anywhere; }
.policy-body .operator { font-weight: 550; }
@media (min-width: 1500px) { .hero { min-height: 750px; } }
@media (max-width: 950px) {
  .container { width: calc(100% - 48px); }
  .header-actions { gap: 22px; }
  .site-nav { gap: 20px; }
  .hero { min-height: 620px; gap: 12px; }
  .hero h1 { font-size: 48px; }
  .hero-description { font-size: 15px; }
  .product-figure { height: 480px; }
  .phone-front { width: 200px; right: 3px; top: 12px; }
  .phone-back { width: 160px; left: 3px; top: 54px; }
  .product-figure::before { width: 320px; height: 320px; top: 80px; }
  .feature-grid { gap: 25px; }
  .privacy-band { grid-template-columns: 70px 1fr; gap: 24px; padding: 32px; }
  .privacy-band img { width: 70px; }
  .privacy-band > a { grid-column: 2; }
  .support { gap: 40px; grid-template-columns: 1fr 1.2fr; }
  .policy-layout { grid-template-columns: 170px minmax(0, 1fr); gap: 30px; }
}
@media (max-width: 700px) {
  html { scroll-padding-top: 100px; }
  .container { width: calc(100% - 40px); }
  .header-inner { min-height: 76px; gap: 12px; }
  .brand { gap: 9px; }
  .brand img { width: 36px; height: 36px; border-radius: 9px; }
  .brand-name { font-size: 16px; }
  .header-actions { gap: 14px; }
  .site-nav { display: none; }
  .language-switch a { min-height: 38px; min-width: 44px; padding-inline: 9px; }
  .hero { grid-template-columns: 1fr; padding-top: 45px; padding-bottom: 44px; gap: 40px; }
  .hero h1 { font-size: clamp(40px, 10vw, 60px); max-width: 530px; }
  .hero-description { font-size: 16px; max-width: 480px; margin-top: 22px; }
  .hero-actions { margin-top: 26px; }
  .product-figure { max-width: 370px; width: 100%; height: 490px; margin-inline: auto; }
  .phone-front { width: 205px; right: 16px; }
  .phone-back { width: 165px; top: 49px; left: 12px; }
  .product-figure::before { width: 340px; height: 340px; top: 70px; left: 10px; }
  .section { padding-block: 48px; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 20px; max-width: none; }
  .section-heading h2 { font-size: 30px; }
  .feature-grid { grid-template-columns: 1fr; gap: 30px; margin-top: 32px; }
  .feature-grid article { display: grid; grid-template-columns: 40px 1fr; column-gap: 18px; }
  .feature-number { margin: 0; font-size: 25px; line-height: 1.25; grid-row: span 2; }
  .feature-grid h3 { font-size: 19px; }
  .feature-grid p { margin-top: 10px; }
  .feature-note { margin-top: 24px; }
  .privacy-band { padding: 26px; grid-template-columns: 52px 1fr; gap: 18px; margin-bottom: 48px; }
  .privacy-band img { width: 52px; border-radius: 13px; align-self: start; }
  .privacy-band h2 { font-size: 22px; }
  .privacy-band p { grid-column: 1 / -1; }
  .privacy-band > a { grid-column: 1 / -1; }
  .support { grid-template-columns: 1fr; gap: 38px; }
  .support h2 { font-size: 32px; }
  .support-note { max-width: none; }
  .support-email { font-size: 20px; }
  .footer-inner { flex-direction: column; gap: 12px; }
  .footer-links { gap: 22px; }
  .policy-header { padding-top: 32px; padding-bottom: 30px; }
  .policy-header .eyebrow { margin-top: 30px; }
  .policy-header h1 { font-size: 42px; }
  .policy-layout { grid-template-columns: 1fr; gap: 28px; padding-bottom: 55px; }
  .policy-toc { position: static; border-block: 1px solid var(--line); padding-block: 18px; }
  .policy-toc nav { display: grid; grid-template-columns: 1fr 1fr; column-gap: 18px; }
  .policy-toc a { padding-block: 9px; }
  .policy-summary { padding: 22px; }
  .policy-body section h2 { font-size: 22px; }
}
@media (max-width: 360px) {
  .container { width: calc(100% - 32px); }
  .brand-name { font-size: 14px; }
  .brand img { width: 31px; height: 31px; }
  .brand { gap: 7px; }
  .header-actions { gap: 0; }
  .language-switch a { min-width: 39px; padding-inline: 7px; }
  .hero h1 { font-size: 38px; }
  .hero-actions { gap: 18px; }
  .button { padding-inline: 18px; }
  .product-figure { height: 435px; }
  .phone-front { width: 183px; right: 2px; }
  .phone-back { width: 144px; left: 3px; }
  .product-figure::before { height: 280px; width: 280px; left: 0; }
  .privacy-band { padding: 22px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  .site-header, .site-footer, .policy-toc, .back-link, .skip-link { display: none; }
  .container { width: 100%; }
  .policy-layout { display: block; }
  .policy-header { padding-top: 0; }
  .policy-body section { break-inside: avoid; }
}