.auth-screen {
  position: fixed;
  inset: 0;
  z-index: 12;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background:
    radial-gradient(circle at 50% 44%, rgba(255, 255, 255, 0.55), transparent 18%),
    linear-gradient(180deg, rgba(239, 239, 235, 0.98) 0%, rgba(228, 228, 223, 0.98) 100%);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.8s var(--ease-standard);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.auth-screen.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.auth-screen__inner {
  display: grid;
  justify-items: center;
  gap: 1.5rem;
  text-align: center;
  margin: auto;
}

.auth-screen__status {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.34em;
  color: var(--color-muted);
}

.orbit-system {
  position: relative;
  width: min(19rem, 62vw);
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  transform: scale(0.8);
  opacity: 0;
}

.auth-screen.is-visible .orbit-system {
  animation: orbitIntro 0.9s 0.12s var(--ease-standard) forwards;
}

.orbit,
.orbit-trace,
.orbit-center {
  position: absolute;
  border-radius: 50%;
}

.orbit {
  inset: 50%;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(17, 17, 17, 0.18);
}

.orbit--outer {
  width: 100%;
  height: 100%;
  border-width: 2px;
  animation: rotateClockwise 12s linear infinite;
}

.orbit--middle {
  width: 72%;
  height: 72%;
  border-color: rgba(17, 17, 17, 0.28);
  animation: rotateCounter 8s linear infinite;
}

.orbit--inner {
  width: 44%;
  height: 44%;
  border-style: dashed;
  border-color: rgba(17, 17, 17, 0.34);
  animation: rotateClockwise 5.5s linear infinite;
}

.orbit-trace {
  top: 50%;
  left: 50%;
  width: 0.7rem;
  height: 0.7rem;
  margin: -0.35rem;
  background: var(--color-accent);
  box-shadow: 0 0 18px rgba(255, 140, 0, 0.38);
}

.orbit-trace--one {
  animation: orbitDotOuter 4.4s linear infinite;
}

.orbit-trace--two {
  width: 0.5rem;
  height: 0.5rem;
  margin: -0.25rem;
  animation: orbitDotInner 3.4s linear infinite;
}

.orbit-center {
  width: 0.85rem;
  height: 0.85rem;
  background: #111111;
  box-shadow: 0 0 0 10px rgba(17, 17, 17, 0.05);
}

.auth-screen__copy {
  max-width: 28rem;
}

.auth-screen__headline {
  min-height: 1.6em;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.3vw, 2rem);
  letter-spacing: 0.18em;
}

.auth-screen__subcopy {
  margin: 0.8rem 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--color-muted);
}

.auth-screen__replay {
  margin-top: 1rem;
  padding: 1rem 2.2rem;
  border: 1px solid rgba(255, 140, 0, 0.32);
  background: linear-gradient(90deg, rgba(255, 140, 0, 0.96), rgba(255, 166, 44, 0.96));
  color: #101010;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  cursor: pointer;
  transition:
    border-color 0.4s var(--ease-standard),
    box-shadow 0.4s var(--ease-standard),
    transform 0.4s var(--ease-standard),
    filter 0.4s var(--ease-standard);
}

.auth-screen__replay:hover,
.auth-screen__replay:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.18), 0 0 26px rgba(255, 140, 0, 0.24);
  filter: saturate(1.06);
}

@keyframes orbitIntro {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes rotateClockwise {
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

@keyframes rotateCounter {
  to {
    transform: translate(-50%, -50%) rotate(-360deg);
  }
}

@keyframes orbitDotOuter {
  from {
    transform: rotate(0deg) translateX(9.5rem) rotate(0deg);
  }

  to {
    transform: rotate(360deg) translateX(9.5rem) rotate(-360deg);
  }
}

@keyframes orbitDotInner {
  from {
    transform: rotate(0deg) translateX(4.2rem) rotate(0deg);
  }

  to {
    transform: rotate(-360deg) translateX(4.2rem) rotate(360deg);
  }
}

@media (max-width: 640px) {
  .auth-screen__inner {
    gap: 1.1rem;
  }

  .orbit-system {
    width: min(15rem, 72vw);
  }
}

/* —— 横屏 / 低高度设备：整体压缩，保证「下一步」按钮可见可点 —— */
@media (max-height: 560px) {
  .auth-screen {
    padding: 1rem 1.2rem;
  }

  .auth-screen__inner {
    gap: 0.85rem;
  }

  .orbit-system {
    width: min(12rem, 40vh);
  }

  .auth-screen__subcopy {
    margin-top: 0.5rem;
    font-size: 0.82rem;
    line-height: 1.65;
  }

  .auth-screen__replay {
    margin-top: 0.6rem;
    padding: 0.8rem 1.8rem;
  }
}