/* 首页品牌开屏：默认隐藏，仅由 home-intro.js 在每次访问首页时启用。 */
html.home-intro-enabled,
html.home-intro-enabled body {
  overflow: hidden;
}

.home-intro {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 1000000;
  display: none;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-color: var(--brand-aubergine);
  opacity: 1;
  visibility: visible;
  transform: translateZ(0);
  backface-visibility: hidden;
  contain: paint;
  transition: opacity 650ms ease, visibility 0s linear 650ms;
  will-change: opacity;
}

.home-intro__curtain {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--brand-aubergine);
  background-image:
    radial-gradient(
      circle at 78% 18%,
      rgba(var(--brand-blue-rgb, 9, 82, 145), 0.42) 0%,
      rgba(var(--brand-blue-rgb, 9, 82, 145), 0) 48%
    ),
    linear-gradient(
      135deg,
      var(--brand-aubergine) 0%,
      var(--brand-aubergine) 66%,
      var(--brand-blue) 145%
    );
  transform: translate3d(0, 0, 0);
  backface-visibility: hidden;
  transition: transform 1100ms cubic-bezier(0.65, 0, 0.35, 1);
  will-change: transform;
}

.home-intro__curtain::before {
  content: '';
  position: absolute;
  inset: -12%;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(
      circle at 24% 74%,
      rgba(var(--brand-blue-rgb, 9, 82, 145), 0.26) 0%,
      rgba(var(--brand-blue-rgb, 9, 82, 145), 0) 52%
    ),
    radial-gradient(
      circle at 76% 20%,
      rgba(var(--brand-white-rgb, 255, 255, 255), 0.09) 0%,
      rgba(var(--brand-white-rgb, 255, 255, 255), 0) 44%
    );
  opacity: 0.58;
  transform: scale(1);
  animation: home-intro-curtain-breathe 5.8s ease-in-out infinite;
  will-change: opacity, transform;
}

.home-intro__curtain::after {
  content: '';
  position: absolute;
  top: calc(100% - 1px);
  left: 0;
  width: 100%;
  height: 18vh;
  background: var(--brand-aubergine);
  clip-path: polygon(0 0, 100% 0, 0 100%);
}

.home-intro-enabled .home-intro {
  display: flex;
}

.home-intro-seen .home-intro,
.home-intro[hidden] {
  display: none !important;
}

.home-intro__motif {
  position: absolute;
  top: -4%;
  right: -4%;
  bottom: -4%;
  left: -4%;
  z-index: 0;
  display: block;
  width: 108%;
  height: 108%;
  pointer-events: none;
  opacity: 1;
  transform: translate3d(0, 0, 0);
  backface-visibility: hidden;
  animation: home-intro-motif-in 1400ms cubic-bezier(0.16, 1, 0.3, 1) backwards;
  transition: opacity 600ms ease, transform 900ms cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.home-intro__arc {
  fill: none;
  vector-effect: non-scaling-stroke;
  stroke-linecap: round;
}

.home-intro__arc--blue {
  stroke: rgba(var(--brand-blue-rgb, 9, 82, 145), 0.16);
  stroke-width: clamp(64px, 8vw, 112px);
}

.home-intro__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  max-width: 100%;
  opacity: 1;
  transform: translateY(0);
  backface-visibility: hidden;
  transition: opacity 360ms ease, transform 460ms cubic-bezier(0.22, 1, 0.36, 1);
}

.home-intro__logo-wrap {
  width: 380px;
  max-width: 76vw;
  opacity: 1;
  clip-path: inset(0 0 0 0);
  transform: translateY(0) scale(1);
  animation: home-intro-logo-reveal 900ms cubic-bezier(0.16, 1, 0.3, 1) 180ms backwards;
  transition: opacity 360ms ease, transform 460ms cubic-bezier(0.22, 1, 0.36, 1);
  will-change: clip-path, opacity, transform;
}

.home-intro__logo {
  display: block;
  width: 100%;
  height: auto;
  filter: none;
}

.home-intro__track {
  position: relative;
  width: min(220px, 42vw);
  height: 2px;
  overflow: visible;
  background: rgba(var(--brand-white-rgb, 255, 255, 255), 0.16);
  border-radius: 999px;
  opacity: 1;
  animation: home-intro-track-in 640ms ease 620ms backwards;
}

.home-intro__progress {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--color-text-inverse);
  border-radius: inherit;
  box-shadow: 0 0 0 rgba(var(--brand-white-rgb, 255, 255, 255), 0);
  transform: scaleX(0);
  transform-origin: center;
  will-change: transform, box-shadow;
}

.home-intro.is-complete .home-intro__progress {
  box-shadow: 0 0 14px rgba(var(--brand-white-rgb, 255, 255, 255), 0.42);
  transition: transform 120ms linear, box-shadow 360ms ease;
}

.home-intro.is-exiting {
  background: transparent;
}

.home-intro.is-exiting .home-intro__curtain {
  transform: translate3d(0, calc(-100% - 18vh), 0);
}

.home-intro.is-exiting .home-intro__content {
  opacity: 0;
  transform: translateY(-10px);
}

.home-intro.is-exiting .home-intro__motif {
  opacity: 0;
  transform: translate3d(12px, -12px, 0);
}

@keyframes home-intro-motif-in {
  from {
    opacity: 0;
    transform: translate3d(-18px, 18px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@keyframes home-intro-curtain-breathe {
  0%,
  100% {
    opacity: 0.46;
    transform: scale(1);
  }
  50% {
    opacity: 0.74;
    transform: scale(1.045);
  }
}

@keyframes home-intro-logo-reveal {
  from {
    opacity: 0;
    clip-path: inset(0 50% 0 50%);
    transform: translateY(6px) scale(0.99);
  }
  to {
    opacity: 1;
    clip-path: inset(0 0 0 0);
    transform: translateY(0) scale(1);
  }
}

@keyframes home-intro-track-in {
  from {
    opacity: 0;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 767px) {
  .home-intro__logo-wrap {
    width: 360px;
  }

  .home-intro__content {
    gap: 24px;
  }

  .home-intro__arc--blue {
    stroke-width: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .home-intro {
    transition-duration: 180ms;
  }

  .home-intro__curtain {
    transform: none;
    transition: none;
  }

  .home-intro__curtain::before {
    animation: none;
    opacity: 0.5;
    transform: none;
  }

  .home-intro__motif {
    display: none;
    animation: none;
    transition: none;
  }

  .home-intro__content {
    transform: none;
    transition-duration: 100ms;
  }

  .home-intro__logo-wrap {
    opacity: 1;
    clip-path: none;
    transform: none;
    animation: none;
    transition-duration: 100ms;
  }

  .home-intro__track {
    opacity: 1;
    transform: none;
    animation: none;
  }

  .home-intro__progress {
    transition-duration: 100ms;
  }

  .home-intro.is-exiting {
    opacity: 0;
    visibility: hidden;
    animation: none;
  }

  .home-intro.is-exiting .home-intro__curtain {
    transform: none;
  }
}