:root {
  color-scheme: light;
  --canvas: #ffffff;
  --canvas-soft: #f7f8fa;
  --ink: #101114;
  --body: #4b4e57;
  --muted: #777b86;
  --epoch-color: #007cf0;
  --mind-color: #ff0080;
  --epoch-strong: #006fd9;
  --mind-strong: #e90073;
  --focus: #007cf0;
  --rail-fill: rgb(255 255 255 / 24%);
  --rail-line: rgb(255 255 255 / 48%);
  --rail-shadow: 0 6px 8px rgb(31 43 67 / 8%);
  --section-fill: rgb(248 252 255 / 76%);
  --section-soft-fill: rgb(253 248 255 / 74%);
  --section-entry-fill: rgb(255 255 255 / 34%);
  --product-entry-fill: rgb(248 252 255 / 76%);
  --section-divider: rgb(16 17 20 / 2%);
  --sans:
    Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
    "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --page: 1180px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --canvas: #090a0d;
  --canvas-soft: #0e1015;
  --ink: #f5f7fb;
  --body: #b8bdc8;
  --muted: #858b98;
  --epoch-color: #42baff;
  --mind-color: #ff5bb0;
  --epoch-strong: #6bd0ff;
  --mind-strong: #ff6fbb;
  --focus: #42baff;
  --rail-fill: rgb(16 18 24 / 22%);
  --rail-line: rgb(255 255 255 / 15%);
  --rail-shadow: 0 6px 8px rgb(0 0 0 / 22%);
  --section-fill: rgb(9 10 13 / 72%);
  --section-soft-fill: rgb(14 16 21 / 76%);
  --section-entry-fill: rgb(9 10 13 / 34%);
  --product-entry-fill: rgb(9 10 13 / 72%);
  --section-divider: rgb(255 255 255 / 3%);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--canvas);
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
  isolation: isolate;
  transition:
    background-color 220ms ease,
    color 220ms ease;
}

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

a {
  text-decoration: none;
}

button {
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

::selection {
  background: var(--ink);
  color: var(--canvas);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--canvas);
  font-size: 13px;
  transform: translateY(-150%);
}

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

.lang-en {
  display: none;
}

body[data-language="en"] .lang-zh {
  display: none;
}

body[data-language="en"] .lang-en {
  display: inline;
}

.site-header {
  position: fixed;
  z-index: 50;
  top: 18px;
  right: 0;
  left: 0;
  pointer-events: none;
}

.glass-rail {
  position: relative;
  display: grid;
  width: min(calc(100% - 36px), var(--page));
  min-height: 58px;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  margin: 0 auto;
  padding: 8px 10px 8px 16px;
  overflow: hidden;
  border: 1px solid var(--rail-line);
  border-radius: 16px;
  background: var(--rail-fill);
  box-shadow:
    inset 0 1px 0 rgb(255 255 255 / 36%),
    var(--rail-shadow);
  -webkit-backdrop-filter: blur(18px) saturate(145%);
  backdrop-filter: blur(18px) saturate(145%);
  pointer-events: auto;
  isolation: isolate;
  transition:
    background-color 220ms ease,
    border-color 220ms ease,
    transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

.glass-rail::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    radial-gradient(circle at 12% -35%, rgb(255 255 255 / 38%), transparent 38%),
    linear-gradient(105deg, rgb(255 255 255 / 12%), transparent 48% 74%, rgb(255 255 255 / 5%));
  content: "";
  pointer-events: none;
}

.rail-brand {
  display: inline-flex;
  align-items: baseline;
  justify-self: start;
  font-size: 16px;
  font-weight: 760;
  letter-spacing: -0.04em;
  white-space: nowrap;
}

.rail-brand .epoch,
.company-name .epoch {
  color: var(--epoch-color);
}

.rail-brand .mind,
.company-name .mind {
  color: var(--mind-color);
}

.nav-links {
  position: absolute;
  left: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transform: translateX(-50%);
}

.nav-links a {
  min-width: 64px;
  padding: 8px 11px;
  border-radius: 9px;
  color: var(--body);
  font-size: 14px;
  font-weight: 520;
  text-align: center;
  transition:
    color 160ms ease,
    background-color 160ms ease;
}

.nav-links a:hover {
  background: rgb(255 255 255 / 22%);
  color: var(--ink);
}

.rail-actions {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 2px;
}

.rail-control {
  min-width: 42px;
  min-height: 40px;
  padding: 0 10px;
  border-radius: 9px;
  background: transparent;
  color: var(--body);
  cursor: pointer;
  font-size: 13px;
  font-weight: 620;
  transition:
    color 160ms ease,
    background-color 160ms ease,
    transform 160ms ease;
}

.rail-control:hover {
  background: rgb(255 255 255 / 24%);
  color: var(--ink);
  transform: translateY(-1px);
}

.theme-icon {
  display: inline-block;
  width: 18px;
  height: 18px;
  overflow: hidden;
  border: 1.5px solid currentColor;
  border-radius: 50%;
  vertical-align: -4px;
}

.theme-icon::after {
  display: block;
  width: 50%;
  height: 100%;
  margin-left: auto;
  background: currentColor;
  content: "";
}

main {
  position: relative;
  z-index: 1;
  display: block;
}

.ambient-mesh {
  position: fixed;
  z-index: 0;
  inset: -12%;
  contain: strict;
  opacity: var(--ambient-opacity, 0.72);
  background:
    radial-gradient(ellipse at 8% 68%, #00dfd8 0%, #007cf0 23%, transparent 54%),
    radial-gradient(ellipse at 43% 82%, #007cf0 0%, #7928ca 29%, transparent 62%),
    radial-gradient(ellipse at 74% 72%, #ff0080 0%, #ff4d4d 30%, transparent 60%),
    radial-gradient(ellipse at 100% 83%, #f9cb28 0%, #ff4d4d 26%, transparent 58%),
    radial-gradient(ellipse at 55% 118%, rgb(255 255 255 / 68%) 0%, transparent 42%),
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--canvas) 98%, transparent) 0%,
      transparent 34%,
      color-mix(in srgb, var(--canvas) 20%, transparent) 100%
    );
  transform:
    translate3d(var(--ambient-drift-x, 0px), var(--ambient-shift, 0px), 0)
    scale(var(--mesh-scale, 1.04));
  transform-origin: 50% 72%;
  pointer-events: none;
  will-change: transform, opacity;
}

html[data-theme="dark"] .ambient-mesh {
  opacity: var(--ambient-opacity, 0.5);
}

.morph-stage {
  position: relative;
  height: 178svh;
  min-height: 1120px;
  background: transparent;
}

.hero-sticky {
  position: sticky;
  top: 0;
  display: grid;
  height: 100svh;
  min-height: 640px;
  overflow: hidden;
  place-items: center;
  isolation: isolate;
}

.mesh-veil {
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    linear-gradient(
      to bottom,
      var(--canvas) 0%,
      color-mix(in srgb, var(--canvas) 94%, transparent) 15%,
      transparent 45%,
      transparent 100%
    );
  pointer-events: none;
}

.hero-center {
  position: relative;
  width: min(96vw, 1560px);
  padding: 94px 18px 40px;
  text-align: center;
}

.morph-line {
  --middle-width: 0em;
  --insert-opacity: 0;
  --initial-opacity: 1;
  --final-opacity: 0;
  --initial-pop: 0;
  --epoch-initial-mix: 68%;
  --mind-initial-mix: 66%;
  position: relative;
  z-index: 1;
  display: inline-flex;
  max-width: 100%;
  align-items: baseline;
  justify-content: center;
  color: var(--ink);
  cursor: default;
  font-size: var(--hero-size, clamp(62px, 10vw, 148px));
  font-weight: 790;
  letter-spacing: -0.04em;
  line-height: 0.94;
  white-space: nowrap;
  isolation: isolate;
}

.morph-line::before {
  position: absolute;
  z-index: -1;
  inset: -0.8em -1.15em;
  border-radius: 50%;
  content: "";
  opacity: 0;
  pointer-events: none;
}

.morph-line .insert {
  display: inline-block;
  overflow: visible;
  clip-path: inset(-0.12em 0 -0.28em 0);
  opacity: var(--insert-opacity);
  letter-spacing: -0.04em;
  white-space: nowrap;
  vertical-align: baseline;
}

.morph-line .insert-middle {
  width: var(--middle-width);
}

.morph-line .anchor {
  position: relative;
  display: inline-grid;
  transform: translateX(var(--anchor-shift, 0));
  transition: transform 380ms cubic-bezier(0.22, 1, 0.36, 1);
}

/* compact initial lockup */
.morph-line .anchor-epoch {
  justify-items: end;
}

.morph-line .anchor-mind {
  justify-items: start;
}

.morph-line .case {
  grid-area: 1 / 1;
}

/* initial thin-mist glass */
.morph-line .case-initial {
  color: rgb(255 255 255 / 52%);
  -webkit-text-stroke: 0.75px rgb(255 255 255 / 74%);
  opacity: var(--initial-opacity);
  text-shadow:
    0 1px 0 rgb(255 255 255 / 30%),
    0 8px 18px rgb(19 34 74 / 18%),
    0 0 calc(16px * var(--initial-pop)) rgb(255 255 255 / 38%);
}

.morph-line .anchor-epoch .case-initial {
  color: color-mix(in srgb, var(--epoch-strong) var(--epoch-initial-mix), transparent);
}

.morph-line .anchor-mind .case-initial {
  color: color-mix(in srgb, var(--mind-strong) var(--mind-initial-mix), transparent);
}

.morph-line .case-final {
  opacity: var(--final-opacity);
}

/* final blue-black-pink phrase */
.morph-line .final-epoch {
  color: var(--epoch-strong);
  text-shadow: 0 7px 18px rgb(0 124 240 / 16%);
}

.morph-line .final-bridge {
  color: #101114;
  text-shadow: none;
}

.morph-line .final-mind {
  color: var(--mind-strong);
  text-shadow: 0 7px 18px rgb(255 0 128 / 16%);
}

.hero-translation {
  position: relative;
  z-index: 2;
  margin: clamp(26px, 4.2vh, 48px) 0 0;
  color: var(--ink);
  font-family: "Songti SC", "Noto Serif SC", "STSong", serif;
  font-size: clamp(17px, 1.45vw, 23px);
  letter-spacing: 0.22em;
  opacity: calc(var(--translation-progress, 0) * 0.92);
  transform:
    translateY(var(--translation-y, 18px))
    scale(var(--translation-scale, 0.985));
}

/* dark-mode phrase luminance */
html[data-theme="dark"] .morph-line::before {
  background: radial-gradient(
    ellipse,
    rgb(255 255 255 / 84%) 0%,
    rgb(255 255 255 / 62%) 30%,
    transparent 72%
  );
  opacity: calc(var(--final-opacity) * 0.92);
}

.morph-stage.is-preview .anchor-epoch {
  --anchor-shift: -0.035em;
}

.morph-stage.is-preview .anchor-mind {
  --anchor-shift: 0.035em;
}

.morph-stage.is-preview .morph-line,
.morph-stage[data-preview-ready="true"] .morph-line:hover {
  --initial-pop: 1;
  --epoch-initial-mix: 86%;
  --mind-initial-mix: 84%;
}

.morph-stage[data-preview-ready="true"] .morph-line:hover .anchor-epoch {
  --anchor-shift: -0.035em;
}

.morph-stage[data-preview-ready="true"] .morph-line:hover .anchor-mind {
  --anchor-shift: 0.035em;
}

.section {
  position: relative;
  overflow: hidden;
  padding: clamp(96px, 11vw, 164px) 24px;
  background:
    linear-gradient(
      to bottom,
      transparent 0%,
      var(--section-entry-fill) 22%,
      var(--section-fill) 58%,
      var(--section-fill) 100%
    );
  contain: layout paint style;
}

.narrative-stage {
  position: relative;
  height: 300svh;
  min-height: 1920px;
  overflow: clip;
  contain: layout paint style;
}

.narrative-sticky {
  position: sticky;
  top: 0;
  height: 100svh;
  min-height: 640px;
  overflow: hidden;
  isolation: isolate;
}

.scene-stage {
  position: absolute;
  inset: 0;
  height: 100%;
  min-height: 0;
  padding: 0;
  overflow: hidden;
  opacity: var(--scene-panel-opacity, 1);
  transform: translate3d(0, var(--scene-panel-y, 0px), 0);
  transform-origin: 50% 50%;
  will-change: transform, opacity;
}

.scene-content {
  position: relative;
  display: grid;
  height: 100%;
  min-height: 640px;
  align-items: center;
  isolation: isolate;
}

.scene-content .section-inner {
  width: min(100%, var(--page));
  margin: 0 auto;
  padding: clamp(98px, 12vh, 144px) 24px clamp(62px, 8vh, 104px);
}

.section::before {
  position: absolute;
  z-index: 0;
  inset: 0;
  background:
    radial-gradient(ellipse at 3% 0%, rgb(0 124 240 / 10%), transparent 42%),
    radial-gradient(ellipse at 96% 12%, rgb(255 0 128 / 8%), transparent 44%);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 30%);
  mask-image: linear-gradient(to bottom, transparent 0%, #000 30%);
  content: "";
  opacity: calc(0.18 + var(--scene-progress, 1) * 0.58);
  pointer-events: none;
  transform: scale(calc(0.98 + var(--scene-progress, 1) * 0.02));
  transform-origin: 50% 0%;
}

.section + .section {
  border-top: 1px solid var(--section-divider);
}

.narrative-sticky .section + .section {
  border-top: 0;
}

.section-inner {
  position: relative;
  z-index: 1;
  width: min(100%, var(--page));
  margin: 0 auto;
}

.section-index {
  margin: 0 0 36px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.company-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.62fr) minmax(0, 1.38fr);
  gap: clamp(92px, 13vw, 218px);
  align-items: center;
}

.company-name {
  display: inline-flex;
  margin: 0;
  font-size: clamp(52px, 7.2vw, 96px);
  font-weight: 780;
  letter-spacing: -0.04em;
  line-height: 0.92;
}

.company-copy {
  max-width: 760px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(23px, 2.65vw, 39px);
  font-weight: 520;
  letter-spacing: -0.03em;
  line-height: 1.36;
  text-wrap: pretty;
}

.company-copy-line,
.product-copy-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
}

.copy-fragment,
.title-fragment {
  display: inline-block;
  white-space: nowrap;
}

.company-copy .lang-en,
.product-copy .lang-en {
  display: none;
}

body[data-language="en"] .company-copy .lang-en,
body[data-language="en"] .product-copy .lang-en {
  display: block;
}

.product-section {
  --scene-panel-opacity: 0;
  display: block;
  min-height: 0;
  align-items: center;
  background:
    linear-gradient(
      to bottom,
      var(--section-fill) 0%,
      var(--product-entry-fill) 22%,
      var(--section-soft-fill) 58%,
      var(--section-soft-fill) 100%
    );
}

.product-section::before {
  background:
    radial-gradient(ellipse at 5% 4%, rgb(0 223 216 / 9%), transparent 42%),
    radial-gradient(ellipse at 92% 8%, rgb(255 77 77 / 8%), transparent 46%);
}

.product-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.62fr) minmax(0, 1.38fr);
  gap: clamp(92px, 13vw, 218px);
  align-items: center;
}

.product-kicker {
  margin: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.product-title {
  display: flex;
  flex-wrap: wrap;
  margin: 14px 0 0;
  font-size: clamp(42px, 6vw, 82px);
  font-weight: 730;
  letter-spacing: -0.04em;
  line-height: 0.98;
  text-wrap: balance;
}

.product-copy {
  max-width: 670px;
  margin: 0 0 5px;
  color: var(--body);
  font-size: clamp(21px, 2.3vw, 32px);
  letter-spacing: -0.03em;
  line-height: 1.38;
  text-wrap: pretty;
}

.site-footer {
  position: relative;
  z-index: 1;
  display: flex;
  width: min(calc(100% - 48px), var(--page));
  min-height: 120px;
  align-items: center;
  justify-content: space-between;
  margin: 0 auto;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.footer-identity,
.footer-meta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-brand {
  color: var(--ink);
  font-weight: 700;
}

.footer-company {
  letter-spacing: 0.04em;
}

.footer-meta a {
  border-radius: 6px;
  transition: color 160ms ease;
}

.footer-meta a:hover {
  color: var(--ink);
}

html.motion-ready [data-reveal-item] {
  opacity: var(--reveal-opacity, 1);
  transform: translate3d(var(--reveal-x, 0px), var(--reveal-y, 0px), 0) scale(var(--reveal-scale, 1));
  transform-origin: 50% 62%;
  will-change: transform, opacity;
}

@media (max-width: 760px) {
  .site-header {
    top: 10px;
  }

  .glass-rail {
    width: calc(100% - 20px);
    min-height: 54px;
    padding-left: 13px;
    -webkit-backdrop-filter: blur(14px) saturate(135%);
    backdrop-filter: blur(14px) saturate(135%);
  }

  .nav-links {
    display: none;
  }

  .morph-stage {
    height: 168svh;
    min-height: 980px;
  }

  .hero-sticky {
    min-height: 560px;
  }

  .hero-center {
    width: 100vw;
    padding-inline: 8px;
  }

  .section {
    padding: 92px 22px;
  }

  .narrative-stage {
    height: 318svh;
    min-height: 1780px;
  }

  .narrative-sticky,
  .scene-content {
    min-height: 560px;
  }

  .scene-content .section-inner {
    padding: 84px 22px 64px;
  }

  .company-layout,
  .product-layout {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .company-copy {
    font-size: clamp(23px, 6.8vw, 32px);
  }

  .site-footer {
    width: calc(100% - 44px);
    min-height: 108px;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 12px;
  }

  .footer-identity,
  .footer-meta {
    flex-wrap: wrap;
    gap: 8px 14px;
  }
}

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

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

  html.motion-ready [data-reveal-item] {
    opacity: 1 !important;
    transform: none !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .glass-rail {
    background: color-mix(in srgb, var(--canvas) 96%, var(--ink) 4%);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
}

@media (forced-colors: active) {
  .glass-rail {
    border: 1px solid CanvasText;
    background: Canvas;
    box-shadow: none;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .glass-rail::before,
  .ambient-mesh,
  .mesh-veil {
    display: none;
  }

  .rail-brand .epoch,
  .rail-brand .mind,
  .morph-line .anchor,
  .company-name .epoch,
  .company-name .mind {
    color: CanvasText;
  }
}