.screen__artwork {
  animation: artwork-breathe 8s ease-in-out infinite alternate;
}

.screen__action {
  inset: auto auto calc(58px + env(safe-area-inset-bottom, 0px)) 50%;
  width: 112px;
  height: 46px;
  overflow: visible;
  border: 1px solid rgba(128, 53, 48, 0.64);
  border-radius: 2px;
  color: #332b2a;
  background: rgba(248, 243, 235, 0.72);
  box-shadow: 0 10px 26px rgba(62, 48, 46, 0.08);
  transform: translateX(-50%);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  transition: color 220ms ease, background-color 220ms ease, border-color 220ms ease, transform 220ms ease;
}

.screen__action::before,
.screen__action::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.screen__action::before {
  inset: 5px;
  border: 1px solid rgba(128, 53, 48, 0.18);
}

.screen__action::after {
  left: 50%;
  bottom: -17px;
  width: 52px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(128, 53, 48, 0.42), transparent);
  transform: translateX(-50%);
}

.start-label {
  position: relative;
  z-index: 2;
  font-family: "STKaiti", "KaiTi", "Songti SC", serif;
  font-size: 18px;
  letter-spacing: 0.28em;
  text-indent: 0.28em;
}

.start-ripple {
  position: absolute;
  left: 50%;
  bottom: -28px;
  width: 74px;
  height: 18px;
  border: 1px solid rgba(91, 101, 108, 0.18);
  border-top-color: transparent;
  border-bottom-color: transparent;
  border-radius: 50%;
  transform: translateX(-50%) scale(0.72);
  animation: ink-ripple 3.6s ease-out infinite;
}

.screen__action:hover,
.screen__action:active {
  color: #201c1b;
  border-color: rgba(128, 53, 48, 0.82);
  background: rgba(248, 243, 235, 0.9);
  transform: translateX(-50%) translateY(-2px);
}

.screen__action:focus-visible {
  outline: 2px solid rgba(128, 53, 48, 0.76);
  outline-offset: 4px;
}

@keyframes artwork-breathe {
  from { transform: scale(1); filter: saturate(0.96) contrast(1); }
  to { transform: scale(1.012); filter: saturate(1) contrast(1.025); }
}

@keyframes ink-ripple {
  0% { opacity: 0; transform: translateX(-50%) scale(0.62); }
  28% { opacity: 0.52; }
  100% { opacity: 0; transform: translateX(-50%) scale(1.2); }
}

@media (prefers-reduced-motion: reduce) {
  .screen__artwork,
  .start-ripple {
    animation: none;
  }
}