:root {
  --text: #171717;
  --muted: #71717a;
  --blue: #1264df;
  --surface: #f6f7f9;
  --line: #e4e6eb;
  --shell: 1312px;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: #fff;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 32px; }
body { margin: 0; font-size: 16px; line-height: 1.75; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { line-height: 1.35; font-weight: 600; }
h1 { font-size: 44px; letter-spacing: -1.5px; }
h2 { font-size: 28px; letter-spacing: -.6px; }
h3 { font-size: 20px; }
a { color: inherit; text-decoration: none; text-underline-offset: 5px; }
button, input { font: inherit; }
button { cursor: pointer; }
button, input { -webkit-tap-highlight-color: transparent; }
button:disabled { cursor: default; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--blue); outline-offset: 5px; border-radius: 3px; }
main:focus { outline: none; }
[hidden] { display: none !important; }
.shell { width: min(var(--shell), calc(100% - 96px)); margin-inline: auto; }
.icon { width: 20px; height: 20px; flex: 0 0 auto; vertical-align: middle; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; clip-path: inset(50%); }
.skip-link { position: fixed; top: -80px; left: 24px; z-index: 30; background: #fff; padding: 12px 20px; color: var(--blue); }
.skip-link:focus { top: 12px; }
.site-header { background: #fff; }
.header-inner { min-height: 76px; display: flex; justify-content: space-between; align-items: center; gap: 32px; }
.brand { display: inline-flex; align-items: center; white-space: nowrap; gap: 8px; line-height: 1; }
.brand img { display: block; width: 48px; height: 48px; object-fit: contain; }
.brand-support { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; font-size: 19px; font-weight: 700; color: var(--text); letter-spacing: .2px; }
.site-header .brand { flex-shrink: 0; }
.main-nav { display: flex; align-items: center; gap: 36px; font-size: 15px; }
.main-nav a { min-height: 44px; display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; }
.main-nav a:hover, .main-nav [aria-current] { color: var(--blue); }
.official-link .icon { width: 18px; height: 18px; }
.official-label-compact { display: none; }
.hero { padding-top: 64px; text-align: center; }
.hero h1 { font-size: 64px; line-height: 1.2; letter-spacing: -2px; }
.hero-description { margin-top: 16px; font-size: 20px; color: var(--muted); }
.search-wrap { position: relative; max-width: 800px; margin-inline: auto; }
.hero .search-wrap { margin-top: 32px; }
.search-form { height: 76px; display: flex; align-items: center; gap: 16px; padding: 0 22px; background: #fff; border: 1px solid #d3d7e0; border-radius: 12px; text-align: left; }
.search-form:focus-within { border-color: var(--blue); box-shadow: 0 0 0 3px #1264df0c; }
.search-form > .icon { width: 27px; height: 27px; color: var(--muted); }
.search-form input { width: 100%; min-width: 0; border: 0; outline: 0; color: var(--text); background: transparent; padding: 17px 0; font-size: 18px; line-height: 1.6; border-radius: 0; }
.search-form input:focus-visible { outline: none; }
.search-form input::placeholder { color: #85858e; opacity: 1; }
input[type=search]::-webkit-search-cancel-button { display: none; }
kbd { flex: none; display: grid; place-items: center; width: 28px; height: 30px; border: 1px solid #dce0e7; border-radius: 5px; background: #fafbfc; color: var(--muted); font-family: inherit; font-size: 19px; line-height: 1; }
.icon-button { display: grid; place-items: center; flex: none; width: 40px; height: 44px; margin-right: -6px; border: 0; background: transparent; color: var(--muted); }
.search-submit:focus { position: static; width: auto; height: auto; clip: auto; clip-path: none; }
.popular-searches { margin-top: 18px; display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 8px 24px; font-size: 14px; }
.popular-searches > span { color: var(--muted); }
.popular-searches a { display: inline-flex; align-items: center; min-height: 36px; color: var(--blue); }
.popular-searches a:hover, .text-link:hover, .footer-main nav a:hover, .footer-bottom a:hover { text-decoration: underline; }
.product-section { padding-top: 48px; scroll-margin-top: 30px; }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 14px; }
.product-link { display: flex; flex-direction: column; align-items: center; text-align: center; min-width: 0; padding: 12px 4px 14px; border-radius: 12px; transition: background .18s, color .18s; }
.product-link:hover { background: #f8f9fb; color: var(--blue); }
.product-icon { width: 60px; height: 60px; }
.product-link h3 { font-size: 20px; margin-top: 15px; line-height: 1.5; letter-spacing: -.2px; }
.product-link p { color: var(--muted); font-size: 16px; margin-top: 6px; }
.popular-section { padding-top: 54px; scroll-margin-top: 30px; }
.section-heading { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin-bottom: 18px; }
.text-link { display: inline-flex; align-items: center; gap: 7px; color: var(--blue); min-height: 44px; font-size: 17px; }
.text-link .icon { width: 18px; height: 18px; }
.popular-articles { display: grid; grid-auto-flow: column; grid-template-rows: repeat(3, auto); grid-template-columns: 1fr 1fr; column-gap: 56px; }
.article-row { display: flex; align-items: center; gap: 18px; min-height: 66px; padding: 16px 0; line-height: 1.6; }
.article-row > .icon:first-child { width: 23px; height: 23px; color: #303440; }
.article-row-copy { flex: 1; min-width: 0; }
.article-row-title { font-size: 17px; display: block; }
.row-chevron { width: 18px; height: 18px; color: #757b89; margin-left: auto; transition: transform .18s; }
.article-row:hover .article-row-title { color: var(--blue); }
.article-row:hover .row-chevron { transform: translateX(3px); color: var(--blue); }
.contact-banner { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding: 54px 56px; min-height: 240px; background: var(--surface); border-radius: 16px; margin-top: 72px; }
.contact-banner h2 { font-size: 36px; letter-spacing: -1px; }
.contact-banner p { color: var(--muted); margin-top: 10px; font-size: 18px; }
.contact-banner .text-link { margin-top: 20px; font-size: 18px; }
.contact-banner-icon { width: 100px; height: 100px; margin-right: 20px; color: #303238; }
.site-footer { padding: 56px 0 26px; color: var(--muted); }
.footer-main { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 48px; }
.footer-brand { color: var(--text); }
.footer-brand-name { font-size: 22px; font-weight: 600; letter-spacing: .5px; }
.footer-brand img { width: 42px; height: 42px; }
.footer-main nav { margin-left: auto; display: flex; align-items: center; justify-content: flex-end; gap: 28px; font-size: 14px; color: #50515d; }
.footer-main nav a { display: inline-flex; align-items: center; justify-content: flex-end; min-width: 44px; min-height: 44px; gap: 4px; }
.footer-main nav .icon { display: none; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-top: 12px; font-size: 13px; }
.footer-bottom a { min-height: 44px; display: flex; align-items: center; }
.search-suggestions { position: absolute; z-index: 10; top: calc(100% + 10px); left: 0; right: 0; border: 1px solid var(--line); border-radius: 12px; background: #fff; padding: 15px 22px 12px; text-align: left; }
.suggestion-label { font-size: 12px; color: var(--muted); margin-bottom: 5px; }
.search-suggestions .article-row { gap: 13px; padding: 10px 0; min-height: 48px; }
.search-suggestions .article-row-title { font-size: 15px; }
.search-suggestions .article-row > .icon:first-child { width: 18px; height: 18px; }
.suggestion-empty { padding: 18px 0; font-size: 15px; color: var(--muted); }
.all-search-results { display: flex; align-items: center; min-height: 44px; margin-top: 4px; color: var(--blue); font-size: 14px; }
.breadcrumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; padding-top: 32px; color: var(--muted); font-size: 13px; }
.breadcrumbs a { min-height: 36px; display: flex; align-items: center; }
.breadcrumbs a:hover { color: var(--blue); }
.breadcrumbs .icon { width: 12px; height: 12px; color: #9b9ba4; }
.product-hero { padding: 52px 0 48px; }
.product-heading { display: flex; align-items: center; gap: 20px; }
.product-heading .product-icon { width: 52px; height: 52px; }
.product-hero > p { margin-top: 15px; font-size: 19px; color: var(--muted); }
.product-hero > .text-link { margin-top: 15px; font-size: 15px; }
.category-content { max-width: 960px; }
.category-content > h2 { margin-bottom: 12px; font-size: 24px; }
.article-row--detailed { padding: 25px 0; gap: 20px; }
.article-row--detailed > .icon:first-child { align-self: flex-start; margin-top: 4px; }
.article-row--detailed .article-row-title { font-size: 20px; font-weight: 500; text-wrap: balance; }
.article-row-summary { display: block; color: var(--muted); font-size: 15px; margin-top: 7px; }
.article-row-product { display: block; color: #85858e; font-size: 12px; margin-top: 8px; }
.category-articles .article-row-product { display: none; }
.other-products { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 28px; margin-top: 48px; font-size: 14px; }
.other-products > span { color: var(--muted); }
.other-products a { min-height: 44px; display: flex; align-items: center; color: var(--blue); }
.reading-layout { display: grid; grid-template-columns: 220px minmax(0, 760px); gap: 72px; margin-top: 45px; padding-bottom: 24px; }
.article-directory { position: sticky; top: 38px; align-self: start; padding-top: 12px; }
.article-directory > p { font-size: 12px; color: #85858e; margin-bottom: 16px; }
.article-directory nav { display: grid; gap: 12px; }
.article-directory nav a { font-size: 14px; color: #656570; padding: 4px 0; }
.article-directory nav a:hover { color: var(--blue); }
.directory-contact { display: inline-flex; align-items: center; min-height: 44px; gap: 6px; color: var(--blue); font-size: 14px; margin-top: 28px; }
.directory-contact .icon { width: 15px; height: 15px; }
.article-category { font-size: 14px; color: var(--muted); margin-bottom: 12px; }
.article-heading h1 { font-size: 38px; letter-spacing: -1px; }
.article-summary { font-size: 18px; color: var(--muted); margin-top: 18px; }
.article-meta { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 22px; font-size: 12px; color: #85858e; }
.copy-link { border: 0; background: none; color: var(--muted); display: inline-flex; align-items: center; gap: 7px; min-height: 44px; font-size: 13px; padding: 0; }
.copy-link:hover { color: var(--blue); }
.copy-link .icon { width: 16px; height: 16px; }
.copy-status { color: var(--blue); font-size: 12px; }
.article-section { margin-top: 42px; }
.article-section h2 { font-size: 24px; line-height: 1.5; letter-spacing: -.3px; scroll-margin-top: 32px; }
.article-section p, .article-section ol { margin: 15px 0 0; font-size: 16px; line-height: 1.95; color: #45454c; }
.article-section ol { padding-left: 23px; }
.article-section li { padding-left: 5px; margin-top: 12px; }
.article-section li::marker { color: #7a7a85; font-variant-numeric: tabular-nums; }
.section-links { display: flex; flex-wrap: wrap; gap: 12px 28px; margin-top: 16px; }
.section-links .text-link { font-size: 15px; }
.article-help { margin-top: 48px; background: var(--surface); padding: 28px 32px; border-radius: 12px; }
.article-help h2 { font-size: 22px; }
.article-help p { color: var(--muted); font-size: 15px; margin-top: 8px; }
.article-help .text-link { font-size: 15px; margin-top: 8px; }
.related-articles { margin-top: 44px; }
.related-articles h2 { font-size: 22px; margin-bottom: 8px; }
.back-link { margin-top: 28px; display: inline-flex; align-items: center; gap: 10px; min-height: 44px; font-size: 14px; color: var(--muted); }
.back-link:hover { color: var(--blue); }
.search-page-heading { padding: 42px 0 40px; }
.search-page-heading h1 { font-size: 40px; }
.search-page-heading .search-wrap { max-width: 850px; margin: 24px 0 0; }
.search-page-heading .search-form { height: 62px; }
.search-layout { display: grid; grid-template-columns: 220px minmax(0, 850px); gap: 58px; min-height: 470px; }
.search-filters { align-self: start; position: sticky; top: 30px; display: grid; gap: 6px; }
.search-filters > p { color: #85858e; font-size: 12px; padding: 0 14px 10px; }
.filter-button { display: flex; align-items: center; gap: 13px; text-align: left; padding: 10px 14px; min-height: 46px; border: 0; border-radius: 8px; background: none; color: #666670; font-size: 14px; }
.filter-button:hover { background: #f8f9fb; }
.filter-button.is-active { background: #f0f5fc; color: var(--blue); font-weight: 500; }
.result-count { font-size: 15px; color: var(--muted); font-weight: 400; letter-spacing: 0; margin: 7px 0 8px; }
.empty-search { padding: 70px 20px 100px; text-align: center; }
.empty-search > .icon { width: 42px; height: 42px; color: #a3a3ae; margin-bottom: 20px; }
.empty-search h2 { font-size: 23px; }
.empty-search p { font-size: 15px; color: var(--muted); margin: 12px 0; }
.no-script-message { padding: 20px; background: var(--surface); color: var(--muted); font-size: 14px; }
.contact-heading { padding: 52px 0 66px; }
.contact-heading h1 { font-size: 44px; }
.contact-heading h1 span { display: inline-block; }
.contact-heading p { font-size: 19px; color: var(--muted); margin-top: 18px; }
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 100px; max-width: 1080px; }
.contact-channel-title { display: flex; align-items: center; gap: 13px; }
.contact-channel-title > .icon { width: 28px; height: 28px; }
.contact-channel h2, .contact-checklist h2 { font-size: 25px; }
.contact-channel > p { font-size: 16px; color: var(--muted); margin-top: 14px; }
.contact-qr { margin-top: 26px; }
.contact-qr > a { display: inline-block; border-radius: 4px; }
.contact-qr img { display: block; width: 208px; height: 208px; object-fit: contain; }
.contact-qr figcaption { display: grid; margin-top: 14px; justify-items: start; }
.contact-qr figcaption .text-link { font-size: 15px; }
.contact-qr figcaption span { color: var(--muted); font-size: 13px; }
.contact-checklist ol { list-style: none; counter-reset: preparation; padding: 0; margin: 24px 0 0; }
.contact-checklist li { counter-increment: preparation; position: relative; padding-left: 36px; margin-bottom: 24px; }
.contact-checklist li::before { content: counter(preparation, decimal-leading-zero); position: absolute; top: 1px; left: 0; color: #9a9aa4; font-size: 13px; }
.contact-checklist li h3 { font-size: 17px; font-weight: 500; }
.contact-checklist li p { font-size: 15px; color: var(--muted); margin-top: 6px; }
.contact-note { font-size: 13px; color: var(--muted); line-height: 1.85; }
.contact-checklist > .text-link { margin-top: 15px; font-size: 14px; }
.contact-self-service { margin-top: 72px; max-width: 900px; }
.contact-self-service h2 { font-size: 24px; margin-bottom: 16px; }
.not-found { padding: 100px 0; min-height: 55vh; }
.not-found > p { color: var(--muted); margin: 20px 0; }
@media (min-width: 1600px) {
  .hero { padding-top: 84px; }
  .product-section { padding-top: 62px; }
}
@media (max-width: 1080px) {
  .shell { width: calc(100% - 64px); }
  .main-nav { gap: 24px; }
  .product-link p { font-size: 13px; }
  .popular-articles { column-gap: 32px; }
  .article-row-title { font-size: 16px; }
  .article-row { gap: 12px; }
  .reading-layout { grid-template-columns: 180px minmax(0, 1fr); gap: 40px; }
  .contact-layout { gap: 64px; }
  .search-layout { grid-template-columns: 180px minmax(0, 1fr); gap: 32px; }
}
@media (max-width: 600px) {
  .site-header .shell { width: calc(100% - 32px); }
  .header-inner { min-height: 64px; flex-wrap: nowrap; gap: 16px; padding: 0; }
  .brand img { width: 40px; height: 40px; }
  .brand-support { display: none; }
  .main-nav { width: auto; margin-left: auto; justify-content: flex-end; flex-shrink: 0; gap: 16px; font-size: 15px; }
  .main-nav a { min-width: 44px; min-height: 44px; justify-content: center; }
  .main-nav .official-link { font-size: inherit; gap: 2px; }
  .official-link .icon { width: 14px; height: 14px; }
}
@media (max-width: 760px) {
  .shell { width: calc(100% - 48px); }
  h1 { font-size: 34px; letter-spacing: -.9px; }
  h2 { font-size: 24px; }
  .hero { padding-top: 48px; }
  .hero h1 { font-size: 38px; letter-spacing: -1.1px; }
  .hero-description { font-size: 15px; margin-top: 14px; }
  .hero .search-wrap { margin-top: 27px; }
  .search-form { height: 58px; gap: 11px; padding: 0 15px; border-radius: 10px; }
  .search-form > .icon { width: 23px; height: 23px; }
  .search-form input { font-size: 16px; padding: 14px 0; }
  .search-form kbd { display: none; }
  .popular-searches { font-size: 12px; gap: 0 18px; margin-top: 12px; }
  .popular-searches > span { display: none; }
  .popular-searches a { min-height: 44px; }
  .product-section { padding-top: 45px; }
  .product-section h2 { font-size: 23px; }
  .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px 10px; margin-top: 22px; }
  .product-link { padding: 16px 2px 13px; }
  .product-icon { width: 42px; height: 42px; }
  .product-link h3 { font-size: 18px; margin-top: 13px; }
  .product-link p { font-size: 12px; margin-top: 4px; }
  .popular-section { padding-top: 43px; }
  .section-heading { gap: 16px; margin-bottom: 13px; }
  .section-heading h2 { font-size: 23px; }
  .section-heading .text-link { font-size: 13px; gap: 3px; }
  .section-heading .text-link .icon { width: 14px; height: 14px; }
  .popular-articles { display: flex; flex-direction: column; }
  .article-row { padding: 15px 0; gap: 12px; min-height: 63px; }
  .article-row-title { font-size: 15px; }
  .article-row > .icon:first-child { width: 20px; height: 20px; }
  .row-chevron { width: 15px; height: 15px; }
  .contact-banner { margin-top: 44px; padding: 30px 27px; min-height: auto; border-radius: 12px; gap: 12px; }
  .contact-banner h2 { font-size: 27px; letter-spacing: -.6px; }
  .contact-banner p { font-size: 15px; margin-top: 13px; max-width: 270px; }
  .contact-banner .text-link { font-size: 15px; margin-top: 14px; }
  .contact-banner-icon { display: none; }
  .site-footer { padding-top: 36px; padding-bottom: 22px; }
  .footer-main { gap: 16px; }
  .footer-brand img { width: 36px; height: 36px; }
  .footer-main nav { gap: 20px; font-size: 12px; }
  .footer-bottom { gap: 12px; padding-top: 6px; font-size: 11px; }
  .footer-bottom a { min-height: 44px; white-space: nowrap; }
  .search-suggestions { padding: 12px 15px; }
  .search-suggestions .article-row-title { font-size: 13px; }
  .breadcrumbs { padding-top: 23px; font-size: 12px; gap: 7px; }
  .product-hero { padding: 34px 0; }
  .product-heading { gap: 14px; }
  .product-heading h1 { font-size: 31px; }
  .product-heading .product-icon { width: 40px; height: 40px; }
  .product-hero > p { font-size: 16px; margin-top: 15px; }
  .product-hero > .text-link { font-size: 14px; margin-top: 10px; }
  .category-content > h2 { font-size: 21px; }
  .article-row--detailed { padding: 20px 0; gap: 13px; }
  .article-row--detailed .article-row-title { font-size: 17px; }
  .article-row-summary { font-size: 14px; margin-top: 6px; }
  .other-products { gap: 0 22px; margin-top: 30px; font-size: 12px; }
  .other-products > span { width: 100%; margin-bottom: 8px; }
  .reading-layout { display: block; margin-top: 26px; }
  .article-directory { display: none; }
  .article-heading h1 { font-size: 29px; line-height: 1.5; letter-spacing: -.6px; }
  .article-category { font-size: 12px; margin-bottom: 9px; }
  .article-summary { font-size: 16px; margin-top: 14px; }
  .article-meta { font-size: 10px; gap: 12px; margin-top: 14px; }
  .copy-link { font-size: 12px; white-space: nowrap; }
  .article-section { margin-top: 31px; }
  .article-section h2 { font-size: 22px; }
  .article-section p, .article-section ol { font-size: 15px; line-height: 1.95; margin-top: 12px; }
  .article-help { padding: 24px; margin-top: 35px; }
  .article-help h2 { font-size: 21px; }
  .related-articles { margin-top: 34px; }
  .related-articles h2 { font-size: 21px; }
  .search-page-heading { padding: 28px 0 26px; }
  .search-page-heading h1 { font-size: 32px; }
  .search-page-heading .search-wrap { margin-top: 20px; }
  .search-page-heading .search-form { height: 58px; }
  .search-layout { display: block; }
  .search-filters { display: flex; flex-wrap: wrap; gap: 5px; position: static; margin-bottom: 22px; }
  .search-filters > p { display: none; }
  .filter-button { padding: 8px 11px; font-size: 12px; min-height: 44px; }
  .filter-button .icon { display: none; }
  .result-count { font-size: 13px; }
  .empty-search { padding: 50px 0 60px; }
  .empty-search h2 { font-size: 21px; }
  .contact-heading { padding: 30px 0 38px; }
  .contact-heading h1 { font-size: 32px; letter-spacing: -.8px; }
  .contact-heading p { font-size: 16px; margin-top: 14px; }
  .contact-layout { grid-template-columns: 1fr; gap: 44px; }
  .contact-channel h2, .contact-checklist h2 { font-size: 23px; }
  .contact-channel > p { font-size: 14px; }
  .contact-channel-title > .icon { width: 25px; height: 25px; }
  .contact-qr { margin-top: 24px; }
  .contact-self-service { margin-top: 45px; }
  .contact-self-service h2 { font-size: 22px; }
  .not-found { padding: 55px 0; }
  .not-found h1 { font-size: 30px; }
}
@media (max-width: 480px) {
  .header-inner { gap: 12px; }
  .official-label { display: none; }
  .official-label-compact { display: inline; }
}
@media (max-width: 374px) {
  .header-inner { gap: 8px; }
  .main-nav { gap: 12px; }
}
@media (max-width: 350px) {
  .shell { width: calc(100% - 40px); }
  .site-header .shell { width: calc(100% - 16px); }
  .header-inner { gap: 4px; }
  .main-nav { gap: 10px; }
  .hero h1 { font-size: 33px; }
  .hero-description { font-size: 13px; }
  .search-form input { font-size: 14px; }
  .popular-searches { gap: 0 15px; font-size: 11px; }
  .product-link p { font-size: 11px; }
  .footer-bottom { flex-wrap: wrap; gap: 0; font-size: 11px; }
  .footer-bottom > span { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}
@media print {
  .site-header, .site-footer, .article-directory, .copy-link, .article-help, .related-articles, .back-link { display: none !important; }
  .shell { width: 100%; }
  .reading-layout { display: block; }
  body { font-size: 12pt; }
  .article-heading h1 { font-size: 24pt; }
  .article-section { break-inside: avoid; }
}