:root {
  color-scheme: dark;
  font-family: "Noto Serif SC", "Songti SC", "STSong", serif;
  background: #020715;
}

* { box-sizing: border-box; }

html, body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  overflow-x: hidden;
  overflow-y: auto;
}

body { background: #020715; }
body.is-loading { overflow: hidden; }
body.is-loading .site-footer { display: none; }

.hero {
  --turn: 0deg;
  --stage-x: 0px;
  --stage-y: 0px;
  --stage-scale: 1;
  position: relative;
  width: 100vw;
  height: 100svh;
  min-height: 620px;
  overflow: hidden;
  isolation: isolate;
  background: #020715;
  color: #effbff;
}

.visual-stage {
  position: absolute;
  left: var(--stage-x);
  top: var(--stage-y);
  width: 1672px;
  height: 941px;
  transform: scale(var(--stage-scale));
  transform-origin: 0 0;
  pointer-events: none;
}

.scene-picture {
  position: absolute;
  inset: 0;
  display: block;
}

.scene {
  position: absolute;
  inset: 0;
  width: 1672px;
  height: 941px;
  transition: opacity .68s cubic-bezier(.22,.61,.19,1), filter .68s ease;
  will-change: opacity, filter;
}

.scene__background {
  position: absolute;
  inset: 0;
  width: 1672px;
  height: 941px;
  object-fit: fill;
  user-select: none;
  pointer-events: none;
}

.scene--tech { opacity: 1; z-index: 1; }
.scene--art { opacity: 0; z-index: 2; filter: brightness(.85); }

.scene--tech::before,
.scene--tech::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.scene--tech::before {
  z-index: 4;
  inset: 66% -14% -4%;
  background:
    radial-gradient(ellipse 36% 12% at 22% 78%, transparent 0 59%, rgba(111,223,255,.52) 60% 61%, transparent 63%) 0 0 / 560px 112px repeat-x,
    radial-gradient(ellipse 42% 14% at 72% 96%, transparent 0 62%, rgba(72,179,255,.4) 63% 64%, transparent 66%) 130px 32px / 690px 142px repeat-x;
  opacity: .44;
  mix-blend-mode: screen;
  transform: translate3d(-5%, 0, 0);
  animation: waterDrift 11s ease-in-out infinite alternate;
  will-change: transform;
}

.scene--tech::after {
  z-index: 4;
  clip-path: inset(69% 0 0);
  background: linear-gradient(102deg, transparent 32%, rgba(105,234,255,0) 42%, rgba(174,245,255,.28) 50%, rgba(105,234,255,0) 58%, transparent 68%);
  mix-blend-mode: screen;
  transform: translateX(-118%);
  animation: techReflection 10s cubic-bezier(.35,.04,.25,1) infinite;
}

.hero:not(.art-effects-ready) .art-ring-motion { opacity: 0; }
.art-ring-motion { transition: opacity .55s ease; }

.hero[data-scene="art"] .scene--tech { opacity: 0; filter: brightness(1.25); }
.hero[data-scene="art"] .scene--art { opacity: 1; filter: brightness(1); }

.tech-ring-motion {
  position: absolute;
  z-index: 2;
  left: 883px;
  top: 83px;
  width: 670px;
  height: 670px;
}

.tech-ring {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
  filter: saturate(1.08) drop-shadow(0 0 13px rgba(0,157,255,.46));
  mix-blend-mode: screen;
}

.tech-hill-picture {
  position: absolute;
  z-index: 3;
  inset: 0;
  pointer-events: none;
}

.tech-hill {
  display: block;
  width: 1672px;
  height: 941px;
  object-fit: fill;
  pointer-events: none;
}

.rotating-ring {
  transform: rotate(var(--turn));
  transform-origin: 50% 50%;
  transition: transform 1s cubic-bezier(.16,.78,.18,1);
  will-change: transform;
}

.ring-ambient {
  transform-origin: 50% 50%;
}

.art-ring-motion {
  position: absolute;
  z-index: 3;
  left: 918px;
  top: 118px;
  width: 603px;
  height: 603px;
}

.art-ring {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
}

.art-ribbon {
  position: absolute;
  z-index: 2;
  inset: 0;
  display: block;
  overflow: hidden;
  pointer-events: none;
  opacity: .86;
}

.art-ribbon img {
  display: block;
  width: 1672px;
  height: 941px;
  object-fit: fill;
  transform: translate3d(0, 0, 0) scale(1.006);
  transform-origin: 50% 62%;
  animation: ribbonFlow 13s cubic-bezier(.42, 0, .58, 1) infinite alternate;
  will-change: transform;
}

.loading-intro {
  position: absolute;
  z-index: 30;
  inset: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: #020715;
  color: #eafaff;
  transition: opacity .7s cubic-bezier(.22,.61,.19,1), visibility 0s linear .7s;
  animation: introFallbackExit .45s cubic-bezier(.22,.61,.19,1) 4.5s forwards;
}

.loading-intro__ring {
  position: absolute;
  width: min(23vw, 300px);
  aspect-ratio: 1;
  border: 1px solid rgba(89,223,255,.46);
  border-radius: 50%;
  box-shadow: 0 0 26px rgba(41,194,255,.18), inset 0 0 24px rgba(41,194,255,.08);
  animation: introRing 2.2s cubic-bezier(.16,.78,.18,1) infinite;
}

.loading-intro__ring::before,
.loading-intro__ring::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #c9faff;
  box-shadow: 0 0 16px #42dfff;
}

.loading-intro__ring::before { top: -4px; left: 50%; }
.loading-intro__ring::after { right: 8%; bottom: 8%; }

.loading-intro__copy {
  position: relative;
  z-index: 1;
  text-align: center;
  animation: introCopy 1.5s cubic-bezier(.22,.61,.19,1) both;
}

.loading-intro__copy p,
.loading-intro__copy h1,
.loading-intro__copy span { margin: 0; display: block; }
.loading-intro__copy p { font: 400 clamp(13px, .9vw, 17px)/1 "Microsoft YaHei", sans-serif; letter-spacing: .52em; opacity: .66; }
.loading-intro__copy h1 { margin: 18px 0 16px; font-size: clamp(38px, 4vw, 70px); font-weight: 400; letter-spacing: .22em; }
.loading-intro__copy span { font: 500 9px/1 Arial, sans-serif; letter-spacing: .55em; opacity: .54; }

.hero--ready .loading-intro { opacity: 0; visibility: hidden; pointer-events: none; }

.site-header {
  position: absolute;
  z-index: 10;
  top: clamp(28px, 4.25vh, 52px);
  left: 7.15vw;
  right: 7.15vw;
  display: grid;
  grid-template-columns: 190px 1fr 190px;
  align-items: center;
  color: currentColor;
  transition: color 1.35s ease;
}

.brand {
  position: relative;
  display: block;
  width: clamp(150px, 12.5vw, 235px);
  height: clamp(47px, 3.9vw, 74px);
  color: inherit;
  text-decoration: none;
}

/* The artwork has internal transparent padding, so its visual baseline is corrected here. */
.brand { transform: translateY(-8px); }

.brand__logo {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: left center;
  transition: opacity .55s ease, transform .55s cubic-bezier(.22,.61,.19,1);
}

.brand__logo--tech { opacity: 1; }
.brand__logo--art { opacity: 0; transform: translateY(4px); }
.hero[data-scene="art"] .brand__logo--tech { opacity: 0; transform: translateY(-4px); }
.hero[data-scene="art"] .brand__logo--art { opacity: 1; transform: translateY(0); }

.site-nav {
  grid-column: 2;
  display: flex;
  justify-content: center;
  gap: clamp(28px, 3vw, 56px);
  font-family: "Microsoft YaHei", sans-serif;
  font-size: clamp(13px, .8vw, 16px);
}

.site-nav a {
  position: relative;
  padding: 2px 2px 16px;
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 1px;
  background: #30dbff;
  transform: translateX(-50%);
  box-shadow: 0 0 9px #30dbff;
  transition: width .35s ease;
}

.site-nav a:hover::after,
.site-nav a.is-active::after { width: 100%; }

.hero-copy {
  position: absolute;
  z-index: 8;
  left: 10.9vw;
  top: 48.5%;
  width: 48vw;
  transform: translateY(-50%);
  transition: opacity 1s ease, transform 1.35s cubic-bezier(.22,.61,.19,1), color 1.2s ease;
}

.hero-copy--tech { opacity: 1; }
.hero-copy--art { opacity: 0; transform: translateY(calc(-50% + 24px)); color: #183b67; }
.hero[data-scene="art"] .hero-copy--tech { opacity: 0; transform: translateY(calc(-50% - 24px)); }
.hero[data-scene="art"] .hero-copy--art { opacity: 1; transform: translateY(-50%); }

.hero-copy__eyebrow {
  margin: 0 0 20px;
  font: 500 clamp(9px, .68vw, 13px)/1.2 Arial, sans-serif;
  letter-spacing: .36em;
  opacity: .62;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(46px, 4.25vw, 82px);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: .12em;
  white-space: nowrap;
  text-shadow: 0 0 24px rgba(109,207,255,.36);
}

.hero-copy--art h1 { text-shadow: 0 5px 24px rgba(74,110,158,.12); }

.hero-copy__sub {
  display: flex;
  align-items: center;
  gap: 20px;
  width: max-content;
  margin: 32px 0 0;
  font-size: clamp(17px, 1.35vw, 26px);
  letter-spacing: .28em;
}

.hero-copy__sub::after {
  content: "";
  width: 150px;
  height: 1px;
  background: currentColor;
  opacity: .4;
}

.hero-copy__en {
  margin: 17px 0 0;
  font: 400 clamp(9px, .64vw, 12px)/1.4 Arial, sans-serif;
  letter-spacing: .3em;
  opacity: .56;
}

.art-services,
.tech-services {
  position: absolute;
  z-index: 9;
  left: 50%;
  bottom: clamp(34px, 5.2vh, 66px);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 1vw, 20px);
  width: min(79vw, 1520px);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 30px);
  transition: opacity .62s ease, transform .8s cubic-bezier(.22,.61,.19,1);
}

.hero[data-scene="art"] .art-services,
.hero[data-scene="tech"] .tech-services {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
  transition-delay: .14s;
}

.art-service-card,
.tech-service-card {
  display: flex;
  align-items: center;
  min-height: 158px;
  gap: clamp(10px, 1.1vw, 18px);
  padding: 14px clamp(12px, 1.25vw, 22px);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.82);
  border-radius: 8px;
  background: linear-gradient(120deg, rgba(255,255,255,.48), rgba(236,247,255,.2));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.75), 0 14px 34px rgba(61,108,159,.12);
  color: #183b67;
  text-decoration: none;
  backdrop-filter: blur(16px) saturate(1.15);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
  transition: transform .35s ease, background .35s ease, box-shadow .35s ease;
}

.art-service-card:hover {
  background: linear-gradient(120deg, rgba(255,255,255,.66), rgba(220,242,255,.32));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.95), 0 18px 42px rgba(61,108,159,.2);
  transform: translateY(-4px);
}

.tech-service-card {
  border-color: rgba(77,211,255,.62);
  background: linear-gradient(120deg, rgba(9,37,79,.66), rgba(7,18,48,.34));
  box-shadow: inset 0 1px 0 rgba(176,239,255,.3), 0 14px 34px rgba(0,0,0,.27), 0 0 24px rgba(28,170,255,.13);
  color: #effbff;
}

.tech-service-card:hover {
  background: linear-gradient(120deg, rgba(12,59,116,.72), rgba(8,27,67,.42));
  box-shadow: inset 0 1px 0 rgba(198,247,255,.48), 0 18px 42px rgba(0,0,0,.32), 0 0 32px rgba(28,170,255,.23);
  transform: translateY(-4px);
}

.art-service-card__icon {
  flex: 0 0 auto;
  width: clamp(72px, 6.15vw, 116px);
  aspect-ratio: 1;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.tech-service-card__icon {
  flex: 0 0 auto;
  width: clamp(72px, 6.15vw, 116px);
  aspect-ratio: 1;
  object-fit: contain;
  filter: drop-shadow(0 0 10px rgba(27,193,255,.35));
}

.art-service-card__content {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.tech-service-card__content {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.art-service-card strong {
  font-size: clamp(17px, 1.25vw, 25px);
  font-weight: 500;
  letter-spacing: .12em;
}

.tech-service-card strong {
  font-size: clamp(17px, 1.25vw, 25px);
  font-weight: 500;
  letter-spacing: .12em;
}

.art-service-card__content > span {
  color: rgba(24,59,103,.72);
  font: 400 clamp(10px, .7vw, 13px)/1.7 "Microsoft YaHei", sans-serif;
  letter-spacing: .06em;
  white-space: nowrap;
}

.tech-service-card__content > span {
  color: rgba(218,244,255,.72);
  font: 400 clamp(10px, .7vw, 13px)/1.7 "Microsoft YaHei", sans-serif;
  letter-spacing: .06em;
  white-space: nowrap;
}

.site-footer {
  position: relative;
  z-index: 1;
  min-height: clamp(132px, 14.4vh, 164px);
  padding: clamp(22px, 2.35vh, 30px) 10.5vw 16px;
  color: rgba(239,251,255,.88);
  background: linear-gradient(90deg, rgba(1,10,29,.93), rgba(2,23,55,.86), rgba(1,10,29,.93));
  border-top: 1px solid rgba(121,219,255,.18);
  box-shadow: 0 -12px 36px rgba(0,7,24,.19);
  transition: color 1s ease, background 1s ease, border-color 1s ease;
}

.site-footer__main {
  display: grid;
  grid-template-columns: minmax(380px, 1.7fr) repeat(3, minmax(160px, .6fr));
  align-items: center;
  gap: clamp(24px, 3vw, 62px);
}

.site-footer__company,
.site-footer__contact {
  color: inherit;
  text-decoration: none;
}

.site-footer__company { display: grid; gap: 7px; }

.site-footer__company strong {
  font-size: clamp(15px, 1.08vw, 21px);
  font-weight: 500;
  letter-spacing: .12em;
  white-space: nowrap;
}

.site-footer__company span,
.site-footer__legal {
  font: 500 clamp(8px, .54vw, 10px)/1.35 Arial, sans-serif;
  letter-spacing: .16em;
  opacity: .62;
}

.site-footer__contact {
  display: flex;
  align-items: center;
  gap: 13px;
}

.site-footer__contact img {
  width: clamp(28px, 2vw, 38px);
  height: clamp(28px, 2vw, 38px);
  flex: 0 0 auto;
  object-fit: contain;
  opacity: .82;
  filter: invert(1) brightness(2) contrast(.72);
}

.site-footer__contact span {
  display: grid;
  gap: 6px;
  font: 500 clamp(9px, .65vw, 12px)/1.2 Arial, sans-serif;
  letter-spacing: .06em;
  opacity: .8;
}

.site-footer__contact b {
  font: 500 clamp(11px, .72vw, 13px)/1 "Microsoft YaHei", sans-serif;
  letter-spacing: .16em;
}

.site-footer__legal {
  display: flex;
  justify-content: center;
  gap: 26px;
  margin-top: 13px;
}

.site-footer__legal a { color: inherit; text-decoration: none; }

.hero[data-scene="art"] + .site-footer {
  color: rgba(24,59,103,.84);
  background: linear-gradient(90deg, rgba(250,252,255,.91), rgba(237,246,255,.84), rgba(250,252,255,.91));
  border-top-color: rgba(79,133,186,.16);
  box-shadow: 0 -12px 36px rgba(74,110,158,.08);
}

.hero[data-scene="art"] + .site-footer .site-footer__contact img {
  filter: none;
  opacity: .76;
}

.phase-control {
  position: absolute;
  z-index: 12;
  left: 50%;
  bottom: clamp(28px, 4.6vh, 54px);
  display: grid;
  grid-template-columns: 38px 106px 38px;
  grid-template-rows: 38px auto;
  align-items: center;
  gap: 0 8px;
  transform: translateX(-50%);
  font-family: "Microsoft YaHei", sans-serif;
  color: currentColor;
  transition: color 1.2s ease;
}

.phase-control__button {
  width: 38px;
  height: 38px;
  border: 1px solid currentColor;
  border-radius: 50%;
  background: rgba(5,21,48,.18);
  color: inherit;
  font: 300 25px/32px Arial, sans-serif;
  cursor: pointer;
  opacity: .75;
  backdrop-filter: blur(8px);
}

.phase-control__track {
  height: 1px;
  background: currentColor;
  opacity: .28;
  overflow: hidden;
}

.phase-control__progress {
  display: block;
  width: 25%;
  height: 100%;
  background: #35dcff;
  transform: translateX(0);
  transition: transform 1.2s cubic-bezier(.22,.61,.19,1);
  box-shadow: 0 0 9px #35dcff;
}

.phase-control__hint {
  grid-column: 1 / -1;
  margin-top: 10px;
  text-align: center;
  font-size: 10px;
  letter-spacing: .24em;
  opacity: .55;
}

.scene-index {
  position: absolute;
  z-index: 10;
  right: 4.2vw;
  top: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  transform: translateY(-50%);
  font: 10px/1 Arial, sans-serif;
  color: currentColor;
  opacity: .62;
  transition: color 1.2s ease;
}

.scene-index__current { font-size: 14px; }
.scene-index__line { width: 1px; height: 54px; background: currentColor; opacity: .45; }

.transition-veil {
  position: absolute;
  z-index: 7;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  background: radial-gradient(circle at 72.5% 41.8%, rgba(211,245,255,.45), transparent 24%);
  transition: opacity .75s ease;
}

.mobile-menu-button,
.mobile-nav,
.mobile-transition { display: none; }

.hero.is-switching .transition-veil { animation: veil .68s ease both; }

.hero[data-scene="art"] { color: #183b67; }
.hero[data-scene="art"] .phase-control__button { background: rgba(255,255,255,.45); }
.hero[data-scene="art"] .phase-control__progress { background: #278bd9; box-shadow: 0 0 8px rgba(39,139,217,.5); }

@keyframes veil {
  0%, 100% { opacity: 0; }
  45% { opacity: .72; }
}

@keyframes waterDrift {
  0% { transform: translate3d(-5%, 0, 0); opacity: .32; }
  50% { opacity: .52; }
  100% { transform: translate3d(5%, -2%, 0); opacity: .36; }
}

@keyframes ribbonFlow {
  0% { transform: translate3d(-.8%, .3%, 0) scale(1.006); opacity: .72; }
  52% { opacity: .94; }
  100% { transform: translate3d(.9%, -.45%, 0) scale(1.018); opacity: .82; }
}

@keyframes techReflection {
  0%, 28% { transform: translateX(-118%); opacity: 0; }
  38% { opacity: .5; }
  57% { transform: translateX(118%); opacity: .36; }
  68%, 100% { transform: translateX(118%); opacity: 0; }
}

@keyframes introRing {
  0% { transform: rotate(0deg) scale(.92); opacity: .12; }
  32% { opacity: .92; }
  100% { transform: rotate(360deg) scale(1.08); opacity: .2; }
}

@keyframes introCopy {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes introFallbackExit {
  to { opacity: 0; visibility: hidden; pointer-events: none; }
}

@media (max-aspect-ratio: 4/3) {
  .site-header { left: 5vw; right: 5vw; grid-template-columns: auto 1fr; }
  .site-nav { justify-content: flex-end; gap: 24px; }
  .hero-copy { left: 7vw; top: 45%; width: 58vw; }
  .hero-copy h1 { font-size: clamp(38px, 6vw, 64px); }
}

@media (max-width: 780px) {
  .hero { min-height: 560px; height: 100svh; }
  .visual-stage {
    left: 0 !important;
    top: 0 !important;
    width: 100vw;
    height: 100svh;
    transform: none !important;
  }
  .scene,
  .scene__background,
  .tech-hill { width: 100vw; height: 100svh; }
  .scene__background { object-fit: fill; }
  .scene--tech > .scene-picture:first-child {
    background: #020715 url("assets/hero-mobile-tech-v1.webp") center / cover no-repeat;
  }
  .scene--art > .scene-picture:first-child {
    background: #f8fbff url("assets/hero-mobile-art-v1.webp") center / cover no-repeat;
  }
  .scene--tech > .scene-picture:first-child .scene__background,
  .scene--art > .scene-picture:first-child .scene__background { display: none; }
  .tech-ring-motion,
  .tech-hill-picture,
  .art-ring-motion,
  .art-ribbon,
  .scene--tech::before,
  .scene--tech::after { display: none; }
  .site-header {
    top: 14px;
    left: 4vw;
    right: 4vw;
    display: block;
    height: 48px;
    align-items: center;
  }
  .brand { width: 118px; height: 40px; transform: translateY(0); }
  .site-nav {
    position: absolute;
    top: 13px;
    left: 126px;
    right: 0;
    display: flex;
    justify-content: space-between;
    gap: 0;
    font-size: 9px;
    line-height: 1;
  }
  .site-nav a { padding: 2px 0 8px; }
  .mobile-menu-button,
  .mobile-nav { display: none !important; }
  .hero-copy { left: 6vw; top: 23%; width: 88vw; text-align: center; }
  .hero-copy h1 { font-size: clamp(28px, 8.5vw, 42px); letter-spacing: .055em; }
  .hero-copy__eyebrow,
  .hero-copy__en { display: none; }
  .hero-copy__sub { justify-content: center; width: 100%; margin-top: 14px; font-size: 14px; letter-spacing: .16em; }
  .hero-copy__sub::before,
  .hero-copy__sub::after { width: 34px; content: ""; height: 1px; background: currentColor; opacity: .35; }
  .art-services, .tech-services {
    z-index: 12;
    width: 88vw;
    gap: 7px;
    top: 62svh;
    bottom: auto;
    padding-top: 18px;
  }
  .art-services::before,
  .tech-services::before {
    position: absolute;
    top: -9px;
    left: 50%;
    font-size: 12px;
    letter-spacing: .22em;
    transform: translateX(-50%);
  }
  .tech-services::before { content: "科技·驱动未来"; }
  .art-services::before { content: "艺术·传递价值"; }
  .art-service-card, .tech-service-card { min-height: 164px; padding: 9px 4px; flex-direction: column; justify-content: flex-start; gap: 6px; }
  .art-service-card__icon, .tech-service-card__icon { width: min(15vw, 62px); }
  .art-service-card__content, .tech-service-card__content { gap: 4px; }
  .art-service-card strong, .tech-service-card strong { font-size: clamp(11px, 3.15vw, 14px); line-height: 1.22; letter-spacing: .03em; text-align: center; }
  .art-service-card__content > span, .tech-service-card__content > span { display: block; font: 400 7px/1.48 "Microsoft YaHei", sans-serif; letter-spacing: 0; opacity: .8; text-align: center; }
  .site-footer { min-height: 146px; padding: 18px 5vw 12px; }
  .site-footer__main { grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
  .site-footer__company { grid-column: 1 / -1; }
  .site-footer__company strong { font-size: 12px; }
  .site-footer__company span { display: none; }
  .site-footer__contact { gap: 6px; }
  .site-footer__contact img { width: 23px; height: 23px; }
  .site-footer__contact span { font-size: 8px; }
  .site-footer__legal { justify-content: flex-start; margin-top: 9px; font-size: 7px; gap: 12px; }
  .scene-index { display: none; }
  .mobile-transition {
    position: absolute;
    z-index: 7;
    inset: 0;
    display: block;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: opacity .18s ease;
  }
  .mobile-transition__half {
    position: absolute;
    inset: 0;
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    opacity: 0;
  }
  .mobile-transition__rotor {
    position: absolute;
    inset: 0;
    transform-origin: 50% 50%;
  }
  .mobile-transition__half--tech {
    background-image: url("assets/hero-mobile-tech-v1.webp");
    clip-path: inset(0 50% 0 0);
  }
  .mobile-transition__half--art {
    background-image: url("assets/hero-mobile-art-v1.webp");
    clip-path: inset(0 0 0 50%);
  }
  .mobile-transition__tech,
  .mobile-transition__art {
    position: absolute;
    top: 52%;
    font: 500 12px/1 "Microsoft YaHei", sans-serif;
    letter-spacing: .18em;
    opacity: 0;
  }
  .mobile-transition__tech { left: 5vw; color: #8ce9ff; }
  .mobile-transition__art { right: 5vw; color: #35567f; }
  .hero[data-phase="1"] .mobile-transition,
  .hero[data-phase="3"] .mobile-transition,
  .hero.is-switching:not(.hero--ready) .mobile-transition { opacity: 0; }
  .hero.hero--ready[data-phase="1"] .mobile-transition,
  .hero.hero--ready[data-phase="3"] .mobile-transition { opacity: 1; }
  .hero.hero--ready[data-phase="1"] .mobile-transition__half,
  .hero.hero--ready[data-phase="3"] .mobile-transition__half { opacity: 1; }
  .hero.hero--ready[data-phase="1"] .mobile-transition__rotor { animation: mobileHalfSpin .62s cubic-bezier(.16,.78,.18,1) both; }
  .hero.hero--ready[data-phase="3"] .mobile-transition__rotor { animation: mobileHalfSpinReverse .62s cubic-bezier(.16,.78,.18,1) both; }
  .hero.hero--ready[data-phase="1"] .mobile-transition__tech,
  .hero.hero--ready[data-phase="1"] .mobile-transition__art,
  .hero.hero--ready[data-phase="3"] .mobile-transition__tech,
  .hero.hero--ready[data-phase="3"] .mobile-transition__art { animation: mobileTaijiCopy 2.6s ease both; }
  .hero.hero--ready.is-switching[data-phase="0"] .mobile-transition,
  .hero.hero--ready.is-switching[data-phase="2"] .mobile-transition {
    opacity: 1;
    animation: mobileTaijiFade .72s ease forwards;
  }
}

@keyframes mobileHalfSpin {
  0% { transform: rotate(-180deg) scale(1.48); }
  100% { transform: rotate(0deg) scale(1); }
}

@keyframes mobileHalfSpinReverse {
  0% { transform: rotate(180deg) scale(1.48); }
  100% { transform: rotate(0deg) scale(1); }
}

@keyframes mobileTaijiCopy {
  0%, 23% { opacity: 0; }
  34%, 86% { opacity: 1; }
  100% { opacity: 0; }
}

@keyframes mobileTaijiFade {
  0%, 38% { opacity: 1; }
  100% { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}