:root {
  color-scheme: dark;
  --intro-bg: #080a09;
  --intro-text: #f5f7f2;
  --intro-line: rgba(231, 241, 228, 0.16);
  --intro-lime: #ccff46;
  --intro-safe-top: env(safe-area-inset-top, 0px);
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC",
    "Helvetica Neue", "Microsoft YaHei UI", sans-serif;
  color: var(--intro-text);
  background: #07070b;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: 0;
  content: "";
  pointer-events: none;
  opacity: 0.34;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.07'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}

.app-intro-page {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  isolation: isolate;
}

.app-intro-canvas {
  position: fixed;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.86;
  transition: opacity 520ms ease, filter 520ms ease;
}

.app-intro-canvas > canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: transparent;
}

.app-intro-header {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 4;
  display: flex;
  width: min(1440px, calc(100% - clamp(40px, 6vw, 104px)));
  align-items: center;
  justify-content: space-between;
  min-height: 54px;
  padding: var(--intro-safe-top) 0 0;
  transform: translateX(-50%);
}

.app-intro-brand,
.app-intro-international,
.app-intro-back,
.app-intro-sound-toggle {
  color: inherit;
  text-decoration: none;
}

.app-intro-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 32px;
  font-size: 16px;
  font-weight: 560;
  letter-spacing: -0.03em;
  line-height: 1;
}

.app-intro-brand img {
  width: auto;
  height: 32px;
  object-fit: contain;
  filter: grayscale(1) brightness(0) invert(1);
}

.app-intro-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.app-intro-back,
.app-intro-international,
.app-intro-sound-toggle {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--intro-line);
  border-radius: 999px;
  color: rgba(245, 247, 242, 0.7);
  background: rgba(255, 255, 255, 0.035);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-family: inherit;
  font-size: 13px;
  line-height: 1;
  white-space: nowrap;
  transition:
    transform 160ms cubic-bezier(0.23, 1, 0.32, 1),
    color 160ms cubic-bezier(0.23, 1, 0.32, 1),
    border-color 160ms cubic-bezier(0.23, 1, 0.32, 1),
    background-color 160ms cubic-bezier(0.23, 1, 0.32, 1);
}

.app-intro-international {
  color: var(--intro-lime);
  border-color: rgba(209, 255, 73, 0.34);
  background: rgba(209, 255, 73, 0.06);
}

.app-intro-sound-toggle {
  appearance: none;
  cursor: pointer;
}

.app-intro-sound-toggle[aria-pressed="true"] {
  color: #080a09;
  border-color: var(--intro-lime);
  background: var(--intro-lime);
}

.app-intro-back:focus-visible,
.app-intro-international:focus-visible,
.app-intro-sound-toggle:focus-visible {
  outline: 2px solid var(--intro-lime);
  outline-offset: 3px;
}

.app-intro-back:active,
.app-intro-international:active,
.app-intro-sound-toggle:active {
  transform: scale(0.97);
}

.app-intro-main {
  position: relative;
  z-index: 3;
  display: grid;
  place-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 100px 24px 86px;
}

.app-intro-enter {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: inherit;
  text-align: center;
  text-decoration: none;
  outline: none;
  transform: translateY(16px);
  opacity: 0;
  animation: introCopyIn 1.1s cubic-bezier(0.22, 1, 0.36, 1) 160ms forwards;
}

.app-intro-enter h1 {
  position: relative;
  margin: 0;
  color: #09090d;
  font-size: clamp(96px, 16vw, 240px);
  font-weight: 500;
  line-height: 0.92;
  letter-spacing: 0.06em;
  text-indent: 0.06em;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.025);
  transition:
    color 160ms cubic-bezier(0.23, 1, 0.32, 1),
    text-shadow 160ms cubic-bezier(0.23, 1, 0.32, 1),
    transform 220ms cubic-bezier(0.23, 1, 0.32, 1);
}

.app-intro-enter-label {
  margin-top: 20px;
  color: rgba(245, 247, 242, 0.58);
  font-size: 13px;
  font-weight: 560;
  letter-spacing: 0.18em;
  text-indent: 0.18em;
  transition: color 160ms cubic-bezier(0.23, 1, 0.32, 1);
}

.app-intro-enter:focus-visible h1 {
  color: #0b0a10;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
  transform: scale(1.018);
}

@media (hover: hover) and (pointer: fine) {
  .app-intro-back:hover,
  .app-intro-international:hover,
  .app-intro-sound-toggle:hover {
    color: #fff;
    border-color: rgba(231, 241, 228, 0.3);
    background: rgba(255, 255, 255, 0.07);
  }

  .app-intro-sound-toggle[aria-pressed="true"]:hover {
    color: #080a09;
    border-color: #dcff75;
    background: #dcff75;
  }

  .app-intro-enter:hover h1 {
    color: #0b0a10;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
    transform: scale(1.018);
  }
}

.app-intro-enter:focus-visible {
  border-radius: 18px;
  box-shadow: 0 0 0 2px var(--intro-lime), 0 0 0 7px rgba(204, 255, 70, 0.13);
}

.app-intro-page.is-entering .app-intro-enter {
  opacity: 0;
  filter: blur(8px);
  transform: scale(0.985);
  transition:
    opacity 180ms cubic-bezier(0.23, 1, 0.32, 1),
    filter 220ms cubic-bezier(0.23, 1, 0.32, 1),
    transform 240ms cubic-bezier(0.23, 1, 0.32, 1);
}

.app-intro-page.is-entering .app-intro-header {
  opacity: 0;
  filter: blur(8px);
  transform: translateX(-50%) scale(0.985);
  transition:
    opacity 180ms cubic-bezier(0.23, 1, 0.32, 1),
    filter 220ms cubic-bezier(0.23, 1, 0.32, 1),
    transform 240ms cubic-bezier(0.23, 1, 0.32, 1);
}

.app-intro-page.is-entering .app-intro-canvas {
  opacity: 0;
  filter: blur(12px);
  transition:
    opacity 180ms cubic-bezier(0.23, 1, 0.32, 1),
    filter 220ms cubic-bezier(0.23, 1, 0.32, 1);
}

@keyframes introCopyIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  body::after {
    position: fixed;
    inset: -2px;
    z-index: 20;
    content: "";
    pointer-events: none;
    opacity: 0;
    background: #07070b;
    transition: opacity 220ms cubic-bezier(0.23, 1, 0.32, 1);
  }

  .app-intro-header {
    min-height: 68px;
    width: min(100%, calc(100% - 28px));
    padding-top: var(--intro-safe-top);
  }

  .app-intro-brand {
    font-size: 18px;
  }

  .app-intro-brand img {
    height: 42px;
  }

  .app-intro-back,
  .app-intro-international,
  .app-intro-sound-toggle {
    min-height: 36px;
    padding: 0 9px;
    font-size: 11px;
  }

  .app-intro-actions {
    gap: 6px;
  }

  .app-intro-main {
    padding-right: 18px;
    padding-left: 18px;
  }

  .app-intro-enter h1 {
    font-size: clamp(88px, 31vw, 132px);
  }

  .app-intro-enter {
    border: 0;
    -webkit-appearance: none;
    appearance: none;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    background: transparent;
    user-select: none;
  }

  .app-intro-enter h1 {
    pointer-events: none;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  }

  .app-intro-enter:active {
    outline: none;
    background: transparent;
    box-shadow: none;
  }

  .app-intro-page.is-entering .app-intro-enter {
    filter: none;
    box-shadow: none;
    transform: scale(0.992);
    transition:
      opacity 160ms cubic-bezier(0.23, 1, 0.32, 1),
      transform 220ms cubic-bezier(0.23, 1, 0.32, 1);
  }

  .app-intro-page.is-entering .app-intro-enter:focus,
  .app-intro-page.is-entering .app-intro-enter:focus-visible {
    outline: none;
    box-shadow: none;
  }

  .app-intro-page.is-entering .app-intro-header {
    filter: none;
    transform: translateX(-50%) translateY(-4px);
    transition:
      opacity 160ms cubic-bezier(0.23, 1, 0.32, 1),
      transform 220ms cubic-bezier(0.23, 1, 0.32, 1);
  }

  .app-intro-page.is-entering .app-intro-canvas {
    filter: none;
    transition: opacity 200ms cubic-bezier(0.23, 1, 0.32, 1);
  }

  .app-intro-page.is-entering::after {
    opacity: 1;
  }

}

@media (max-width: 640px) and (hover: none) and (pointer: coarse) {
  .app-intro-enter h1 {
    color: rgba(245, 247, 242, 0.2);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
  }

  .app-intro-enter-label {
    color: rgba(245, 247, 242, 0.72);
  }

  .app-intro-enter:focus,
  .app-intro-enter:focus-visible {
    outline: none;
    box-shadow: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .app-intro-enter {
    opacity: 1;
    transform: none;
    animation: none;
  }

  .app-intro-enter,
  .app-intro-enter h1,
  .app-intro-enter-label,
  .app-intro-canvas {
    transition: none !important;
  }

  .app-intro-back:active,
  .app-intro-international:active,
  .app-intro-sound-toggle:active {
    transform: none;
  }
}