:root {
  color-scheme: light dark;
  --bg: #edf1f4;
  --surface: #f8fafb;
  --surface-strong: #ffffff;
  --surface-muted: #dfe5ea;
  --ink: #131920;
  --muted: #5d6874;
  --line: rgba(19, 25, 32, 0.13);
  --accent: #2168bd;
  --accent-soft: #d7e6f8;
  --accent-ink: #0c386d;
  --shadow: 0 24px 70px rgba(48, 67, 87, 0.13);
  --radius: 16px;
  --container: 1280px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f151b;
    --surface: #151d25;
    --surface-strong: #1b242d;
    --surface-muted: #232e39;
    --ink: #eef3f6;
    --muted: #a9b3bd;
    --line: rgba(238, 243, 246, 0.13);
    --accent: #73aef4;
    --accent-soft: #172d47;
    --accent-ink: #d9e9fc;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 5%, transparent), transparent 38%);
  content: "";
  pointer-events: none;
}

img {
  display: block;
  max-width: 100%;
}

figure {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
summary {
  font: inherit;
}

button,
a,
summary {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 72%, white);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--bg);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 48px), var(--container));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(18px) saturate(130%);
  -webkit-backdrop-filter: blur(18px) saturate(130%);
}

.nav-shell {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 72px;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: 10px;
  width: max-content;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.brand-mark {
  position: relative;
  width: 19px;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 6px;
  background: var(--accent);
}

.brand-mark::after {
  position: absolute;
  inset: 4px;
  border: 2px solid var(--bg);
  border-top: 0;
  border-radius: 2px 2px 5px 5px;
  content: "";
}

.desktop-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  white-space: nowrap;
}

.desktop-nav a,
.footer-nav a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  transition: color 180ms ease;
}

.desktop-nav a:hover,
.desktop-nav a[aria-current="page"],
.footer-nav a:hover {
  color: var(--ink);
}

.desktop-nav a[aria-current="page"] {
  box-shadow: inset 0 -2px 0 var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 10px;
}

.lang-toggle,
.mobile-menu summary {
  min-width: 58px;
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-size: 13px;
  font-weight: 750;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.lang-toggle:hover,
.mobile-menu summary:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  background: var(--surface-strong);
}

.lang-toggle:active,
.mobile-menu summary:active,
.button:active {
  transform: translateY(1px) scale(0.99);
}

.mobile-menu {
  position: relative;
  display: none;
}

.mobile-menu summary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  list-style: none;
}

.mobile-menu summary::-webkit-details-marker {
  display: none;
}

.mobile-menu__panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  display: grid;
  width: min(280px, calc(100vw - 32px));
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
  box-shadow: var(--shadow);
}

.mobile-menu__panel a {
  padding: 12px 14px;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
}

.mobile-menu__panel a:hover,
.mobile-menu__panel a[aria-current="page"] {
  background: var(--surface-muted);
  color: var(--ink);
}

main {
  overflow: clip;
}

.hero {
  min-height: calc(100dvh - 72px);
  display: grid;
  align-items: center;
  padding: clamp(48px, 7vh, 82px) 0;
}

.hero-grid,
.product-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.84fr) minmax(420px, 1.16fr);
  align-items: center;
  gap: clamp(38px, 6vw, 92px);
}

.hero-copy {
  max-width: 650px;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 720;
  letter-spacing: -0.045em;
}

h1 {
  max-width: 10ch;
  font-size: clamp(48px, 6.3vw, 86px);
  line-height: 0.96;
}

.product-hero h1 {
  max-width: 11ch;
  font-size: clamp(46px, 5.6vw, 76px);
}

h2 {
  max-width: 15ch;
  font-size: clamp(34px, 4.4vw, 62px);
  line-height: 1.02;
}

h3 {
  font-size: clamp(24px, 2.4vw, 34px);
  line-height: 1.08;
}

.lead {
  max-width: 54ch;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 800;
  white-space: nowrap;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button::after,
.text-link::after {
  margin-left: 9px;
  content: "→";
  transition: transform 180ms ease;
}

.button:hover::after,
.text-link:hover::after {
  transform: translateX(3px);
}

.button-primary {
  background: var(--accent);
  color: #f7fbff;
}

.button-primary:hover {
  background: color-mix(in srgb, var(--accent) 86%, var(--ink));
}

.button-secondary {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink);
}

.button-secondary:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  background: var(--surface-strong);
}

.hero-media,
.product-hero__media,
.story-media,
.wide-media,
.support-hero__media {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-muted);
  box-shadow: var(--shadow);
}

.hero-media {
  aspect-ratio: 4 / 5;
  width: min(100%, calc((100dvh - 212px) * 0.8));
  max-height: calc(100dvh - 212px);
  justify-self: end;
}

.hero-media img,
.product-hero__media img,
.story-media img,
.wide-media img,
.support-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.section {
  padding: clamp(78px, 10vw, 142px) 0;
}

.section-compact {
  padding: clamp(50px, 7vw, 88px) 0;
}

.section-heading {
  display: grid;
  gap: 18px;
  max-width: 760px;
  margin-bottom: 42px;
}

.section-heading p,
.body-copy,
.product-panel p,
.story-copy p,
.feature-cell p,
.support-copy p,
.footer-copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.value-rail {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.value-rail__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.value-item {
  min-height: 160px;
  padding: 30px 34px;
}

.value-item + .value-item {
  border-left: 1px solid var(--line);
}

.value-item strong {
  display: block;
  margin-bottom: 10px;
  font-size: 18px;
}

.value-item span {
  display: block;
  max-width: 32ch;
  color: var(--muted);
}

.product-editorial-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.75fr);
  gap: 20px;
}

.product-panel {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 14px 42px color-mix(in srgb, var(--ink) 8%, transparent);
  transition: transform 260ms cubic-bezier(0.16, 1, 0.3, 1), border-color 180ms ease;
}

.product-panel:hover {
  border-color: color-mix(in srgb, var(--accent) 48%, var(--line));
  transform: translateY(-4px);
}

.product-panel__media {
  overflow: hidden;
  background: var(--surface-muted);
}

.product-panel__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 550ms cubic-bezier(0.16, 1, 0.3, 1);
}

.product-panel:hover img {
  transform: scale(1.02);
}

.product-panel--wide .product-panel__media {
  aspect-ratio: 16 / 9;
}

.product-panel--tall .product-panel__media {
  aspect-ratio: 4 / 5;
}

.product-panel__copy {
  display: grid;
  gap: 13px;
  padding: 28px;
}

.product-kicker {
  margin: 0;
  color: var(--accent);
  font-size: 14px;
  font-weight: 750;
}

.text-link {
  display: inline-flex;
  align-items: center;
  width: max-content;
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
}

.story-split {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  align-items: center;
  gap: clamp(38px, 7vw, 92px);
}

.story-media {
  aspect-ratio: 16 / 10;
}

.story-copy {
  display: grid;
  gap: 24px;
}

.story-points {
  display: grid;
  margin-top: 10px;
}

.story-point {
  display: grid;
  grid-template-columns: 0.68fr 1fr;
  gap: 24px;
  padding: 19px 0;
  border-top: 1px solid var(--line);
}

.story-point strong {
  font-size: 15px;
}

.story-point span {
  color: var(--muted);
  font-size: 15px;
}

.cta-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 34px;
  padding: clamp(34px, 5vw, 64px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
}

.cta-panel__copy {
  display: grid;
  gap: 14px;
}

.cta-panel h2 {
  font-size: clamp(32px, 4vw, 52px);
}

.product-hero-grid {
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
}

.product-hero__media {
  aspect-ratio: 3 / 2;
}

.product-hero--air .product-hero-grid {
  grid-template-columns: minmax(420px, 0.88fr) minmax(0, 1.12fr);
}

.product-hero--air .product-hero__media {
  aspect-ratio: 4 / 5;
  max-height: 680px;
}

.feature-rail {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.feature-rail__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.feature-rail__item {
  padding: 30px 28px;
}

.feature-rail__item + .feature-rail__item {
  border-left: 1px solid var(--line);
}

.feature-rail__item strong {
  display: block;
  margin-bottom: 9px;
  font-size: 16px;
}

.feature-rail__item span {
  color: var(--muted);
  font-size: 14px;
}

.detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(430px, 1.18fr);
  align-items: center;
  gap: clamp(42px, 7vw, 100px);
}

.detail-media {
  overflow: hidden;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-muted);
}

.detail-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail-copy {
  display: grid;
  gap: 24px;
}

.detail-list {
  display: grid;
  gap: 22px;
  margin-top: 8px;
}

.detail-list__item {
  display: grid;
  gap: 6px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.detail-list__item strong {
  font-size: 16px;
}

.detail-list__item span {
  color: var(--muted);
  font-size: 15px;
}

.wide-story {
  display: grid;
  gap: 30px;
}

.wide-media {
  aspect-ratio: 16 / 9;
}

.wide-story__copy {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 0.7fr);
  align-items: start;
  gap: 50px;
}

.wide-story__copy p {
  max-width: 55ch;
  margin: 4px 0 0;
  color: var(--muted);
}

.feature-mosaic {
  display: grid;
  grid-template-columns: 1.35fr 0.75fr;
  grid-template-rows: 1fr 1fr;
  gap: 18px;
}

.feature-cell {
  display: grid;
  align-content: end;
  min-height: 260px;
  gap: 14px;
  padding: clamp(26px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.feature-cell:first-child {
  grid-row: 1 / 3;
  min-height: 540px;
  background: var(--accent-soft);
  color: var(--accent-ink);
}

.feature-cell:nth-child(3) {
  background: var(--ink);
  color: var(--bg);
}

.feature-cell:nth-child(3) p {
  color: color-mix(in srgb, var(--bg) 72%, transparent);
}

.support-hero__media {
  aspect-ratio: 16 / 9;
}

.support-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.support-card {
  padding: clamp(26px, 4vw, 46px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.support-card__header {
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
}

.support-card__header p {
  margin: 0;
  color: var(--muted);
}

.accordion {
  display: grid;
}

.accordion details {
  padding: 17px 0;
  border-top: 1px solid var(--line);
}

.accordion summary {
  position: relative;
  padding-right: 34px;
  cursor: pointer;
  font-weight: 760;
  list-style: none;
}

.accordion summary::-webkit-details-marker {
  display: none;
}

.accordion summary::after {
  position: absolute;
  top: 0;
  right: 2px;
  color: var(--accent);
  content: "+";
  font-size: 20px;
  line-height: 1;
}

.accordion details[open] summary::after {
  content: "−";
}

.accordion details p {
  max-width: 60ch;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.faq-shell {
  display: grid;
  grid-template-columns: minmax(260px, 0.55fr) minmax(0, 1fr);
  gap: clamp(38px, 7vw, 100px);
  align-items: start;
}

.notice-panel {
  display: grid;
  gap: 14px;
  padding: clamp(28px, 4vw, 46px);
  border-left: 4px solid var(--accent);
  background: var(--surface);
}

.notice-panel h2 {
  max-width: none;
  font-size: clamp(28px, 3.5vw, 44px);
}

.notice-panel p {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  padding: 48px 0 34px;
  border-top: 1px solid var(--line);
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: start;
}

.footer-brand {
  display: grid;
  gap: 14px;
  max-width: 440px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px 24px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 38px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

.reveal-enabled .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 720ms cubic-bezier(0.16, 1, 0.3, 1), transform 720ms cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-enabled .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-enabled .reveal-delay {
  transition-delay: 90ms;
}

html[data-lang="zh"] body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

html[data-lang="zh"] h1,
html[data-lang="zh"] h2,
html[data-lang="zh"] h3 {
  letter-spacing: -0.035em;
}

html[data-lang="zh"] h1 {
  max-width: 9ch;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .reveal-enabled .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--bg);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}

@media (max-width: 980px) {
  .desktop-nav {
    display: none;
  }

  .mobile-menu {
    display: block;
  }

  .nav-shell {
    grid-template-columns: 1fr auto;
  }

  .hero,
  .product-hero {
    min-height: auto;
  }

  .hero-grid,
  .product-hero-grid,
  .product-hero--air .product-hero-grid,
  .story-split,
  .detail-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid,
  .product-hero-grid {
    gap: 38px;
  }

  .hero-copy {
    max-width: 740px;
  }

  .hero-media {
    aspect-ratio: 4 / 3;
    width: 100%;
    max-height: none;
    justify-self: stretch;
  }

  .hero-media img {
    object-position: center 68%;
  }

  .product-hero--air .product-hero__media {
    max-height: 620px;
    order: 2;
  }

  .product-editorial-grid {
    grid-template-columns: 1.25fr 0.75fr;
  }

  .feature-rail__grid {
    grid-template-columns: 1fr 1fr;
  }

  .feature-rail__item:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .feature-rail__item:nth-child(4) {
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 760px) {
  .container {
    width: min(calc(100% - 32px), var(--container));
  }

  .nav-shell {
    min-height: 66px;
    gap: 12px;
  }

  .brand {
    font-size: 14px;
  }

  .lang-toggle,
  .mobile-menu summary {
    min-width: 52px;
    min-height: 40px;
    padding-inline: 11px;
  }

  .hero {
    padding: 46px 0 54px;
  }

  h1,
  .product-hero h1 {
    font-size: clamp(43px, 14vw, 62px);
  }

  h2 {
    font-size: clamp(33px, 10vw, 48px);
  }

  .lead {
    font-size: 17px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .value-rail__grid,
  .product-editorial-grid,
  .support-grid,
  .wide-story__copy,
  .faq-shell,
  .footer-top {
    grid-template-columns: 1fr;
  }

  .value-item {
    min-height: auto;
    padding: 25px 0;
  }

  .value-item + .value-item {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .product-panel--tall .product-panel__media {
    aspect-ratio: 16 / 11;
  }

  .story-point {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .cta-panel {
    grid-template-columns: 1fr;
  }

  .feature-rail__grid,
  .feature-mosaic {
    grid-template-columns: 1fr;
  }

  .feature-rail__item,
  .feature-rail__item:nth-child(3),
  .feature-rail__item:nth-child(4) {
    padding-inline: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .feature-rail__item:first-child {
    border-top: 0;
  }

  .feature-cell:first-child {
    grid-row: auto;
    min-height: 340px;
  }

  .feature-cell {
    min-height: 250px;
  }

  .wide-story__copy {
    gap: 14px;
  }

  .footer-nav {
    justify-content: flex-start;
  }

  .footer-bottom {
    display: grid;
  }
}

@media (max-width: 480px) {
  .brand span:last-child {
    display: none;
  }

  .hero-media {
    aspect-ratio: 4 / 5;
  }

  .product-hero__media,
  .wide-media,
  .support-hero__media {
    aspect-ratio: 4 / 3;
  }

  .product-hero--air .product-hero__media {
    aspect-ratio: 4 / 5;
  }
}