:root {
  --ink: #102a4d;
  --ink-soft: #61748c;
  --ink-faint: rgba(16,42,77,.42);
  --blue: #2b78c8;
  --blue-deep: #195fae;
  --line: rgba(16,62,111,.14);
  --page: #fbfdff;
  --max: 1500px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 92px; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--page);
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
img { max-width: 100%; display: block; }

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: 76px;
  border-bottom: 1px solid transparent;
  transition: background .22s ease, border-color .22s ease, backdrop-filter .22s ease;
}
.site-header.scrolled,
.inner-page .site-header {
  background: rgba(251,253,255,.92);
  border-color: var(--line);
  backdrop-filter: blur(16px);
}
.nav-wrap {
  width: calc(100% - 72px);
  height: 100%;
  margin: 0 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand img { width: 52px; height: 26px; object-fit: contain; }
.brand-cn {
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: .08em;
  white-space: nowrap;
}
.brand-en { display: none; }
.nav { display: flex; align-items: center; gap: 34px; }
.nav a {
  position: relative;
  padding: 27px 0 25px;
  color: rgba(16,42,77,.78);
  font-size: 14px;
  letter-spacing: .07em;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 14px;
  width: 0;
  height: 2px;
  background: var(--blue);
  transform: translateX(-50%);
  transition: width .18s ease;
}
.nav a:hover::after,
.nav a.active::after { width: 22px; }
.nav a.active { color: var(--ink); }
.menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border: 0;
  background: transparent;
  cursor: pointer;
  position: relative;
}
.menu-btn span {
  position: absolute;
  left: 9px;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  transition: transform .2s ease, top .2s ease;
}
.menu-btn span:first-child { top: 15px; }
.menu-btn span:last-child { top: 23px; }
.menu-btn.open span:first-child { top: 19px; transform: rotate(45deg); }
.menu-btn.open span:last-child { top: 19px; transform: rotate(-45deg); }

/* Home */
.hero {
  min-height: 100svh;
  position: relative;
  overflow: hidden;
  background-image:
    linear-gradient(90deg, rgba(255,255,255,.13), rgba(255,255,255,0) 52%),
    url("../images/home-hero.png");
  background-size: cover;
  background-position: center center;
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 20%;
  background: linear-gradient(to bottom, rgba(251,253,255,0), rgba(251,253,255,.72));
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 2;
  width: min(calc(100% - 80px), var(--max));
  min-height: 100svh;
  margin: 0 auto;
  display: flex;
  align-items: center;
  padding-top: 42px;
}
.hero-copy { max-width: 720px; transform: translateY(-1.5vh); }
.eyebrow {
  margin: 0 0 20px;
  color: rgba(29,79,132,.46);
  font-size: 10px;
  letter-spacing: .30em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(50px, 5vw, 76px);
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: .035em;
}
.hero-subtitle {
  margin: 18px 0 0;
  color: rgba(16,42,77,.66);
  font-size: clamp(16px, 1.3vw, 21px);
  letter-spacing: .10em;
}
.hero-note { margin-top: 34px; width: 42px; height: 1px; background: rgba(31,91,154,.44); }
.hero-bottom {
  position: absolute;
  z-index: 3;
  left: 50%;
  bottom: 28px;
  width: min(calc(100% - 80px), var(--max));
  transform: translateX(-50%);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: rgba(17,54,92,.38);
  font-size: 9px;
  letter-spacing: .23em;
  text-transform: uppercase;
}
.scroll-cue { display: inline-flex; align-items: center; gap: 10px; }
.scroll-cue::before { content: ""; width: 26px; height: 1px; background: rgba(17,54,92,.28); }

/* Inner pages */
.inner-page main { padding-top: 76px; }
.container { width: min(calc(100% - 80px), var(--max)); margin: 0 auto; }
.page-grid-section { padding: 22px 0 48px; }
.page-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 110px;
  row-gap: 12px;
}
.grid-panel {
  min-width: 0;
  padding: 12px 0 22px;
}
.kicker {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 9px;
  line-height: 1.4;
  letter-spacing: .24em;
  text-transform: uppercase;
}
.panel-title {
  margin: 0;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(28px, 2.25vw, 36px);
  line-height: 1.22;
  font-weight: 600;
  letter-spacing: .025em;
}
.panel-text {
  max-width: 660px;
  margin: 13px 0 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.82;
}
.panel-subtle { color: rgba(16,42,77,.34); }
@media (min-width: 981px) {
  .page-grid > .grid-panel > .panel-text { min-height: 54px; }
}
.panel-link-row {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  margin-top: 14px;
}
.text-link {
  color: var(--blue-deep);
  font-size: 13px;
  letter-spacing: .03em;
}
.text-link:hover { color: var(--blue); }

/* Product */
.product-media {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 1.62 / 1;
  margin-top: 22px;
  background: #edf6fd url("../images/home-hero.png") center / cover no-repeat;
}
.product-media.wave { background-position: 28% 52%; }
.product-media.future { background-position: 79% 49%; filter: saturate(.76); }
.product-media.future::after {
  content: "COMING LATER";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: rgba(16,42,77,.52);
  background: rgba(250,253,255,.58);
  backdrop-filter: blur(1.5px);
  font-size: 10px;
  letter-spacing: .28em;
}
.product-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 16px;
}
.product-meta span {
  padding: 5px 9px;
  border: 1px solid rgba(37,111,192,.13);
  border-radius: 999px;
  color: rgba(16,42,77,.56);
  font-size: 10px;
}

/* Keep the product images aligned across the two-column layout.
   The fixed summary row absorbs one-line / two-line text differences. */
@media (min-width: 981px) {
  .product-panel .product-summary {
    height: 55px;
    overflow: hidden;
  }
}

/* Download */
.download-meta {
  margin-top: 24px;
  border-top: 1px solid var(--line);
}
.download-meta > div {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.download-meta span { color: var(--ink-faint); font-size: 11px; }
.download-meta strong { font-size: 13px; font-weight: 600; }
.download-action { margin-top: 22px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 128px;
  padding: 11px 18px;
  border: 1px solid rgba(37,111,192,.24);
  border-radius: 999px;
  background: rgba(255,255,255,.62);
  color: var(--blue-deep);
  cursor: pointer;
}
.btn.primary {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, #4b97dc, #2a73bf);
  box-shadow: 0 8px 20px rgba(35,103,178,.15);
}
.btn.is-disabled { opacity: .58; cursor: not-allowed; }

/* Support */
.support-note {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.8;
}
.question-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.question-list li {
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  color: rgba(16,42,77,.76);
  font-size: 13px;
}

/* Reusable information list */
.info-list {
  display: grid;
  gap: 0;
  margin-top: 22px;
  border-top: 1px solid var(--line);
}
.info-row {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}
.info-no {
  color: rgba(37,111,192,.45);
  font-size: 9px;
  line-height: 1.6;
  padding-top: 1px;
}
.info-body strong {
  display: block;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.55;
  font-weight: 600;
}
.info-body p {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.72;
}


/* Page wheel hint */
.page-next-hint {
  position: fixed;
  left: 50%;
  bottom: 22px;
  z-index: 45;
  width: 52px;
  height: 52px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  opacity: .66;
  transform: translateX(-50%);
  transition: opacity .18s ease, transform .18s ease;
}
.page-next-hint::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 13px;
  width: 19px;
  height: 19px;
  border-right: 2px solid var(--blue-deep);
  border-bottom: 2px solid var(--blue-deep);
  transform: translateX(-50%) rotate(45deg);
}
.page-next-hint:hover {
  opacity: .9;
  transform: translate(-50%, 3px);
}
.page-next-hint:focus-visible {
  outline: 1px solid rgba(43,120,200,.42);
  outline-offset: 3px;
  border-radius: 50%;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--page);
}
.footer-inner {
  min-height: 88px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 28px;
  color: rgba(16,42,77,.48);
  font-size: 10px;
}
.footer-links { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer-links a:hover { color: var(--blue-deep); }
.footer-note { text-align: right; line-height: 1.7; }

@media (max-width: 980px) {
  .page-next-hint { display: none; }
  .site-header { height: 70px; }
  .inner-page main { padding-top: 70px; }
  .nav-wrap,
  .container,
  .hero-inner,
  .hero-bottom { width: min(calc(100% - 36px), var(--max)); }
  .nav-wrap { margin: 0 auto; }
  .brand img { width: 46px; }
  .brand-cn { font-size: 18px; }
  .menu-btn { display: block; }
  .nav {
    position: fixed;
    top: 70px;
    left: 18px;
    right: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 20px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: rgba(251,253,255,.98);
    box-shadow: 0 18px 42px rgba(25,67,110,.12);
    backdrop-filter: blur(16px);
  }
  .nav.open { display: flex; }
  .nav a { padding: 14px 4px; }
  .nav a::after { display: none; }
  .hero { min-height: 760px; background-position: 62% center; }
  .hero-inner { min-height: 760px; align-items: flex-start; padding-top: 220px; }
  .hero-copy { max-width: 100%; }
  .hero h1 { font-size: clamp(44px, 12vw, 66px); }
  .hero-subtitle { max-width: 92%; font-size: 15px; line-height: 1.8; }
  .hero-bottom { bottom: 24px; }
  .hero-bottom > :last-child { display: none; }
  .page-grid-section { padding: 24px 0 44px; }
  .page-grid { grid-template-columns: 1fr; row-gap: 10px; }
  .grid-panel { padding: 18px 0 22px; }
  .product-media { aspect-ratio: 1.75 / 1; }
  .footer-inner { padding: 24px 0; align-items: flex-start; flex-direction: column; }
  .footer-note { text-align: left; }
}

@media (max-width: 560px) {
  .container { width: calc(100% - 32px); }
  .page-grid-section { padding: 20px 0 38px; }
  .panel-title { font-size: 28px; }
  .panel-text { font-size: 14px; }
  .download-meta > div { grid-template-columns: 1fr; gap: 4px; }
  .product-media { aspect-ratio: 1.45 / 1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}

/* V10 brand refresh -------------------------------------------------------- */
/* The logo image now contains the symbol, English name and Chinese name. */
.site-header { height: 88px; }
.inner-page main { padding-top: 88px; }
.nav-wrap { width: calc(100% - 80px); margin: 0 40px; }
.brand { display: inline-flex; align-items: center; line-height: 0; }
.brand img {
  width: auto;
  height: 66px;
  max-width: 190px;
  object-fit: contain;
}
.brand-cn,
.brand-en { display: none !important; }
.nav a { padding-top: 33px; padding-bottom: 31px; }
.nav a::after { bottom: 18px; }

/* The clean scenic image remains separate from live HTML text/navigation. */
.hero {
  background-image:
    linear-gradient(90deg, rgba(255,255,255,.20), rgba(255,255,255,.02) 54%, rgba(255,255,255,.02)),
    url("../images/home-hero-brand.png");
  background-position: center center;
}
.hero-flow {
  position: absolute;
  z-index: 1;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: .58;
}
.hero-flow path {
  fill: none;
  stroke: rgba(255,255,255,.78);
  stroke-width: 1.25;
  vector-effect: non-scaling-stroke;
}
.hero-inner { z-index: 2; padding-top: 62px; }
.hero-bottom { z-index: 3; }

@media (max-width: 980px) {
  .site-header { height: 76px; }
  .inner-page main { padding-top: 76px; }
  .nav-wrap { width: min(calc(100% - 36px), var(--max)); margin: 0 auto; }
  .brand img { height: 56px; max-width: 155px; }
  .nav { top: 76px; }
  .hero-flow { opacity: .36; transform: translateX(12%); }
}

@media (max-width: 560px) {
  .brand img { height: 52px; max-width: 145px; }
  .hero-flow { opacity: .28; }
}

/* V14 header refinement ---------------------------------------------------- */
/* Keep navigation close to the brand on desktop, while preserving the
   existing mobile menu behavior. */
@media (min-width: 981px) {
  .nav-wrap {
    justify-content: flex-start;
  }
  .nav {
    margin-left: 26px;
    gap: 32px;
  }
  .brand img {
    height: 58px;
    max-width: 152px;
  }
}

@media (max-width: 980px) {
  .nav-wrap { justify-content: space-between; }
  .nav { margin-left: 0; }
}

/* V17 compact spacing ------------------------------------------------------ */
/* Tighten vertical rhythm across all inner pages while keeping the same
   two-column layout, typography and overall visual language. */
@media (min-width: 981px) {
  .page-grid-section { padding: 14px 0 34px; }
  .page-grid { row-gap: 0; }
  .grid-panel { padding: 7px 0 13px; }

  .panel-text { margin-top: 9px; }
  .info-list { margin-top: 10px; }
  .download-meta { margin-top: 12px; }
  .download-action { margin-top: 14px; }
  .support-note { margin-top: 12px; padding-top: 10px; }
  .question-list { margin-top: 10px; }
  .product-media { margin-top: 12px; }
  .product-meta { margin-top: 10px; }
  .panel-link-row { margin-top: 8px; }
}

@media (max-width: 980px) {
  .page-grid-section { padding: 18px 0 34px; }
  .page-grid { row-gap: 2px; }
  .grid-panel { padding: 12px 0 16px; }
  .info-list,
  .download-meta,
  .question-list,
  .product-media { margin-top: 12px; }
}

/* V18 vertical rhythm refinement ------------------------------------------ */
/* Keep content within each panel compact, while restoring a clearer pause
   between the first and second grid rows. Apply the same rhythm to all inner
   pages so Product / Download / Support / About remain visually consistent. */
@media (min-width: 981px) {
  /* Space between the two horizontal rows of the 2-column grid. */
  .page-grid { row-gap: 26px; }

  /* Tighten title/description -> content transitions inside each panel. */
  .info-list { margin-top: 6px; }
  .download-meta { margin-top: 8px; }
  .support-note { margin-top: 8px; padding-top: 8px; }
  .question-list { margin-top: 6px; }
  .product-media { margin-top: 8px; }
  .product-meta { margin-top: 8px; }

  /* Keep panel padding light so the row gap, not internal padding,
     provides the main visual separation between rows. */
  .grid-panel { padding-top: 6px; padding-bottom: 10px; }
}

@media (max-width: 980px) {
  .page-grid { row-gap: 12px; }
  .info-list,
  .download-meta,
  .question-list,
  .product-media { margin-top: 9px; }
  .support-note { margin-top: 9px; padding-top: 8px; }
}