:root {
  color-scheme: light;
  --bg: #fff; --text: #101717; --muted: #5b6767; --accent: #073c42; --accent-strong: #052f34;
  --line: #d7dfdf; --soft: #f1f8f8; --page: min(1440px, calc(100vw - 64px)); --header-height: 72px;
  --radius-control: 999px; --shadow: 0 22px 70px rgba(7,60,66,.1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--text); background: var(--bg); font-family: "Avenir Next","Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif; font-size: 16px; line-height: 1.55; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
img { display: block; max-width: 100%; }
.section-shell { width: var(--page); margin-inline: auto; }
.sr-only, .skip-link:not(:focus) { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 12px; left: 12px; z-index: 100; padding: 10px 16px; color: #fff; background: var(--accent); border-radius: 999px; }

.site-header { position: sticky; top: 0; z-index: 30; height: var(--header-height); border-bottom: 1px solid rgba(204,215,216,.75); background: rgba(255,255,255,.93); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); }
.header-inner { width: var(--page); height: 100%; margin-inline: auto; display: grid; grid-template-columns: 220px minmax(0,1fr) auto; align-items: center; gap: 28px; }
.brand { width: 204px; }
.brand img { width: 60%; height: auto; }
.site-nav { display: flex; justify-content: center; align-items: center; gap: clamp(18px,2vw,34px); white-space: nowrap; }
.site-nav a, .language-link { position: relative; font-size: 14px; font-weight: 600; }
.site-nav a::after { content: ""; position: absolute; right: 0; bottom: -8px; left: 0; height: 1px; background: var(--accent); transform: scaleX(0); transform-origin: right; transition: transform 220ms ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after, .site-nav a.is-current::after { transform: scaleX(1); transform-origin: left; }
.header-actions { display: flex; align-items: center; gap: 16px; }
.nav-toggle { display: none; }

.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 0 24px; border: 1px solid transparent; border-radius: var(--radius-control); cursor: pointer; font-size: 15px; font-weight: 700; line-height: 1; white-space: nowrap; transition: transform 180ms ease, background-color 180ms ease, color 180ms ease, border-color 180ms ease; }
.button:hover { transform: translateY(-2px); }
.button:active { transform: translateY(1px) scale(.98); }
.button-primary { color: #fff; background: var(--accent); }
.button-primary:hover { background: var(--accent-strong); }
.button-secondary { color: var(--accent); border-color: var(--accent); background: transparent; }
.button-secondary:hover { color: #fff; background: var(--accent); }
.button-compact { min-height: 42px; padding-inline: 20px; font-size: 14px; }
.button-light { color: var(--accent); background: #fff; }

.support-hero { min-height: min(660px,calc(100dvh - var(--header-height))); display: grid; grid-template-columns: .92fr 1.08fr; align-items: center; gap: 72px; padding-block: 54px; }
.support-hero h1 { max-width: 680px; margin: 0; color: var(--accent); font-size: clamp(40px,3vw,49px); font-weight: 650; letter-spacing: -.055em; line-height: 1.23; }
.support-hero-copy > p { max-width: 620px; margin: 28px 0 0; color: var(--muted); font-size: clamp(17px,1.25vw,20px); line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }

.hero-visual { min-width: 0; aspect-ratio: 16/10; margin: 0; overflow: hidden; background: #f8fbff; }
.hero-visual img { width: 100%; height: 100%; object-fit: cover; object-position: center; }

.quick-support { padding-bottom: 86px; }
.quick-support-grid { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.quick-item { min-width: 0; padding: 42px 38px 38px; text-align: center; }
.quick-item + .quick-item { border-left: 1px solid var(--line); }
.line-icon { width: 64px; height: 64px; display: grid; place-items: center; margin-inline: auto; color: var(--accent); }
.line-icon svg { width: 56px; height: 56px; fill: none; stroke: currentColor; stroke-width: 1.55; stroke-linecap: round; stroke-linejoin: round; }
.quick-item h3 { margin: 18px 0 0; color: var(--accent); font-size: 23px; font-weight: 650; }
.quick-item p { max-width: 260px; margin: 10px auto 0; color: var(--muted); font-size: 15px; line-height: 1.75; }

.process-section { padding-block: 96px 104px; border-top: 1px solid var(--line); }
.section-heading { max-width: 920px; }
.section-heading h2 { margin: 0; color: var(--accent); font-size: clamp(36px,3.2vw,50px); font-weight: 650; letter-spacing: -.05em; line-height: 1.2; }
.section-heading p { max-width: 760px; margin: 22px 0 0; color: var(--muted); font-size: 18px; line-height: 1.75; }
.section-heading.centered { margin-inline: auto; text-align: center; }
.section-heading.centered p { margin-inline: auto; }
.service-rail { position: relative; display: grid; grid-template-columns: repeat(6,1fr); margin: 70px 0 0; padding: 0; list-style: none; }
.service-rail::before { content: ""; position: absolute; top: 58px; right: 8.3%; left: 8.3%; height: 1px; background: var(--accent); }
.service-rail li { position: relative; display: grid; justify-items: center; padding-inline: 20px; text-align: center; }
.step-number { color: #6b8587; font-size: 13px; letter-spacing: .12em; }
.step-dot { position: relative; z-index: 2; width: 22px; height: 22px; margin-top: 25px; border: 2px solid var(--accent); border-radius: 50%; background: #fff; }
.service-rail h3 { margin: 23px 0 0; color: var(--accent); font-size: 21px; font-weight: 650; }
.service-rail p { margin: 10px 0 0; color: var(--muted); font-size: 14px; line-height: 1.7; }

.capability-section { padding-block: 106px 112px; border-top: 1px solid var(--line); }
.capability-layout { display: grid; grid-template-columns: .74fr 1.36fr .9fr; align-items: center; gap: 52px; margin-top: 64px; }
.capability-item { display: grid; grid-template-columns: 72px 1fr; align-items: center; gap: 24px; padding-block: 30px; }
.capability-icon { width: 66px; height: 66px; display: grid; place-items: center; color: var(--accent); }
.capability-icon svg { width: 56px; height: 56px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.capability-item h3 { margin: 0; color: var(--accent); font-size: 25px; font-weight: 650; }
.capability-item p { margin: 12px 0 0; color: var(--muted); font-size: 15px; line-height: 1.75; }
.capability-software { align-self: center; }
.capability-photo { min-width: 0; aspect-ratio: 3/2; margin: 0; overflow: hidden; background: #f5f7f7; }
.capability-photo img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.capability-stack .capability-item + .capability-item { border-top: 1px solid var(--line); }

.issue-section { padding-block: 100px 110px; border-top: 1px solid var(--line); }
.issue-flow { position: relative; display: grid; grid-template-columns: repeat(6,1fr); gap: 30px; margin: 68px 0 0; padding: 0; list-style: none; }
.issue-flow::before { content: ""; position: absolute; top: 17px; right: 5%; left: 5%; border-top: 1px dashed #71979a; }
.issue-flow li { position: relative; z-index: 1; display: grid; justify-items: center; padding-inline: 8px; text-align: center; }
.issue-flow li::before { content: ""; position: absolute; z-index: -1; top: 4px; width: 28px; height: 28px; border-radius: 50%; background: #fff; }
.issue-flow span { display: grid; width: 36px; height: 36px; place-items: center; border: 1px solid var(--accent); border-radius: 50%; color: var(--accent); background: #fff; font-size: 12px; }
.issue-flow strong { margin-top: 20px; color: var(--accent); font-size: 17px; }
.issue-flow small { margin-top: 9px; color: var(--muted); font-size: 13px; line-height: 1.65; }
.maintenance-band { display: grid; grid-template-columns: 82px 1fr; align-items: center; gap: 28px; margin-top: 72px; padding: 30px 42px; background: var(--soft); }
.maintenance-icon { width: 70px; height: 70px; display: grid; place-items: center; color: var(--accent); }
.maintenance-icon svg { width: 58px; height: 58px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.maintenance-band h2 { margin: 0; color: var(--accent); font-size: 28px; font-weight: 650; }
.maintenance-band p { margin: 10px 0 0; color: #415456; font-size: 16px; line-height: 1.75; }
.service-photo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; margin-top: 42px; }
.service-photo-grid > figure { aspect-ratio: 3/2; }
.service-photo { min-width: 0; margin: 0; overflow: hidden; background: #f5f7f7; }
.service-photo img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.service-photo-aftersales img { object-position: center 48%; }

.support-contact { padding-block: 48px; color: #fff; background: var(--accent); }
.contact-grid { display: grid; grid-template-columns: 1.3fr repeat(3,1fr) auto; align-items: center; gap: 0; }
.contact-grid h2 { margin: 0; font-size: clamp(30px,2.5vw,40px); font-weight: 650; letter-spacing: -.04em; }
.contact-item { display: grid; gap: 5px; min-height: 54px; align-content: center; padding-inline: 32px; border-left: 1px solid rgba(255,255,255,.3); }
.contact-item span { color: #a9c0c2; font-size: 13px; }
.contact-item strong { font-size: 16px; font-weight: 600; }
.contact-grid .button { margin-left: 24px; }

.site-footer { padding-block: 68px 26px; color: #dce7e8; background: var(--accent-strong); }
.footer-grid { display: grid; grid-template-columns: minmax(280px,1.4fr) repeat(3,1fr); gap: 56px; }
.footer-brand img { width: 150px; filter: brightness(0) invert(1); }
.footer-brand p { max-width: 420px; margin: 18px 0 0; color: #aebfc1; }
.footer-grid h2 { margin: 0 0 18px; color: #fff; font-size: 14px; }
.footer-grid a { display: block; margin: 11px 0; color: #aebfc1; font-size: 14px; }
.footer-grid a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; margin-top: 54px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.16); color: #8fa7aa; font-size: 13px; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity 650ms ease, transform 650ms ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1180px) {
  :root { --page: min(100% - 48px,1080px); }
  .header-inner { grid-template-columns: 170px minmax(0,1fr) auto; gap: 18px; }
  .site-nav { gap: 17px; }
  .site-nav a { font-size: 13px; }
  .support-hero { gap: 44px; }
  .support-hero h1 { font-size: 40px; }
  .quick-item { padding-inline: 24px; }
  .service-rail li { padding-inline: 9px; }
  .capability-layout { grid-template-columns: .82fr 1.15fr 1fr; gap: 30px; }
  .capability-item { grid-template-columns: 58px 1fr; gap: 16px; }
  .capability-icon { width: 54px; height: 54px; }
  .capability-icon svg { width: 48px; height: 48px; }
  .issue-flow { gap: 12px; }
  .contact-grid { grid-template-columns: 1.2fr repeat(3,1fr); }
  .contact-grid .button { grid-column: 1/-1; width: max-content; margin: 28px 0 0 auto; }
}

@media (max-width: 820px) {
  :root { --page: min(100% - 32px,680px); --header-height: 64px; }
  .header-inner { position: relative; grid-template-columns: 1fr auto auto; }
  .brand { width: 160px; }
  .nav-toggle { display: grid; width: 42px; height: 42px; place-content: center; gap: 6px; padding: 0; border: 1px solid var(--line); border-radius: 50%; background: #fff; cursor: pointer; }
  .nav-toggle-line { width: 18px; height: 1px; background: var(--accent); }
  .site-nav { position: absolute; top: calc(100% + 1px); right: 0; left: 0; display: none; justify-content: stretch; align-items: stretch; gap: 0; padding: 14px; border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow); }
  .site-nav.is-open { display: grid; }
  .site-nav a { padding: 12px; font-size: 15px; }
  .site-nav a::after { display: none; }
  .header-actions .button { display: none; }
  .support-hero { min-height: auto; grid-template-columns: 1fr; gap: 36px; padding-block: 56px 48px; }
  .support-hero h1 { max-width: 650px; font-size: clamp(38px,8vw,52px); }
  .quick-support { padding-bottom: 70px; }
  .quick-support-grid { grid-template-columns: 1fr 1fr; }
  .quick-item:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .quick-item:nth-child(4) { border-top: 1px solid var(--line); }
  .process-section, .capability-section, .issue-section { padding-block: 76px; }
  .section-heading h2 { font-size: clamp(36px,7.5vw,48px); }
  .service-rail { grid-template-columns: 1fr 1fr; gap: 0; margin-top: 48px; }
  .service-rail::before { display: none; }
  .service-rail li { align-content: start; padding: 26px 20px; border-top: 1px solid var(--line); }
  .step-dot { margin-top: 14px; }
  .service-rail h3 { margin-top: 16px; }
  .capability-layout { grid-template-columns: 1fr; gap: 20px; }
  .capability-photo { order: -1; }
  .capability-stack { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
  .capability-stack .capability-item + .capability-item { border-top: 0; }
  .issue-flow { grid-template-columns: repeat(3,1fr); gap: 34px 20px; }
  .issue-flow::before { display: none; }
  .maintenance-band { grid-template-columns: 66px 1fr; padding: 28px; }
  .service-photo-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; gap: 28px 0; }
  .contact-grid h2 { grid-column: 1/-1; }
  .contact-item:nth-of-type(odd) { border-left: 0; padding-left: 0; }
  .contact-grid .button { grid-column: 1/-1; margin-top: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1/-1; }
}

@media (max-width: 520px) {
  :root { --page: calc(100% - 28px); }
  .header-inner { grid-template-columns: 1fr auto auto; gap: 10px; }
  .brand { width: 140px; }
  .brand img { width: 70%; }
  .language-link { font-size: 13px; }
  .support-hero { padding-top: 42px; }
  .support-hero h1 { font-size: 36px; line-height: 1.25; }
  .support-hero h1 br { display: none; }
  .support-hero-copy > p { font-size: 16px; }
  .hero-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 28px; }
  .button { min-height: 46px; padding-inline: 10px; font-size: 14px; }
  .hero-visual { aspect-ratio: 4/3; }
  .hero-visual img { object-position: center; }
  .quick-support-grid { grid-template-columns: 1fr; }
  .quick-item, .quick-item + .quick-item { display: grid; grid-template-columns: 60px 1fr; column-gap: 20px; padding: 28px 4px; border-top: 1px solid var(--line); border-left: 0; text-align: left; }
  .quick-item:first-child { border-top: 0; }
  .line-icon { grid-row: 1/3; width: 58px; height: 58px; }
  .line-icon svg { width: 50px; height: 50px; }
  .quick-item h3 { margin: 0; font-size: 21px; }
  .quick-item p { margin: 6px 0 0; }
  .section-heading h2 { font-size: 34px; line-height: 1.24; }
  .section-heading p { font-size: 16px; }
  .service-rail { grid-template-columns: 1fr; padding-left: 26px; }
  .service-rail li { position: relative; justify-items: start; padding: 22px 0 22px 34px; text-align: left; }
  .service-rail li::before { content: ""; position: absolute; top: 0; bottom: 0; left: 7px; width: 1px; background: var(--accent); }
  .step-number { position: absolute; left: 34px; top: 25px; }
  .step-dot { position: absolute; left: 0; top: 20px; width: 16px; height: 16px; margin: 0; }
  .service-rail h3 { margin: 0 0 0 42px; font-size: 20px; }
  .service-rail p { margin: 8px 0 0 42px; }
  .capability-stack { grid-template-columns: 1fr; gap: 0; }
  .capability-stack .capability-item + .capability-item { border-top: 1px solid var(--line); }
  .capability-item { grid-template-columns: 54px 1fr; gap: 16px; }
  .capability-item h3 { font-size: 22px; }
  .issue-flow { grid-template-columns: 1fr; gap: 0; margin-top: 42px; }
  .issue-flow li { grid-template-columns: 44px 1fr; justify-items: start; align-items: center; padding: 19px 0; border-top: 1px solid var(--line); text-align: left; }
  .issue-flow span { grid-row: 1/3; }
  .issue-flow strong { margin: 0; }
  .issue-flow small { margin: 3px 0 0; }
  .maintenance-band { grid-template-columns: 1fr; gap: 12px; padding: 24px; }
  .maintenance-icon { width: 56px; height: 56px; }
  .maintenance-band h2 { font-size: 25px; }
  .maintenance-band p { font-size: 15px; }
  .service-photo-grid { margin-top: 28px; }
  .contact-grid { grid-template-columns: 1fr; gap: 20px; }
  .contact-grid h2 { grid-column: auto; }
  .contact-item { padding: 14px 0; border-top: 1px solid rgba(255,255,255,.25); border-left: 0; }
  .contact-grid .button { grid-column: auto; width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-brand { grid-column: auto; }
  .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,*::before,*::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  .reveal { opacity: 1; transform: none; }
}