:root {
  --update-alert-bg: rgba(52, 57, 67, 0.96);
  --update-alert-border: rgba(255, 255, 255, 0.12);
  --update-alert-text: #f7f7fb;
  --update-alert-muted: rgba(247, 247, 251, 0.82);
  --update-alert-shadow: 0 20px 44px rgba(0, 0, 0, 0.34);
}

.update-alert {
  position: fixed;
  top: max(12px, calc(env(safe-area-inset-top) + 8px));
  left: 50%;
  z-index: 1400;
  width: min(92vw, 420px);
  padding: 12px 14px 14px;
  border: 1px solid var(--update-alert-border);
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent 55%),
    var(--update-alert-bg);
  color: var(--update-alert-text);
  box-shadow: var(--update-alert-shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transform: translate(-50%, -18px);
  opacity: 0;
  pointer-events: none;
  transition:
    transform 220ms ease,
    opacity 220ms ease;
}

.update-alert.is-visible {
  transform: translate(-50%, 0);
  opacity: 1;
  pointer-events: auto;
}

.update-alert__row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: center;
}

.update-alert__icon {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  padding: 8px;
  background: rgba(0, 0, 0, 0.22);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.05) inset,
    0 0 22px rgba(255, 255, 255, 0.06);
}

.update-alert__title {
  display: block;
  margin: 0;
  font-size: 0.92rem;
  font-weight: 800;
  line-height: 1.15;
}

.update-alert__message {
  margin: 4px 0 0;
  color: var(--update-alert-muted);
  font-size: 0.86rem;
  line-height: 1.3;
}

.update-alert__actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 12px;
}

.update-alert__button {
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 0;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition:
    transform 160ms ease,
    opacity 160ms ease,
    background 160ms ease;
}

.update-alert__button:hover,
.update-alert__button:focus-visible {
  transform: translateY(-1px);
}

.update-alert__button--dismiss {
  background: rgba(255, 255, 255, 0.1);
  color: var(--update-alert-text);
}

.update-alert__button--reload {
  background: #f7f7fb;
  color: #10131b;
}

@media (max-width: 520px) {
  .update-alert {
    width: min(94vw, 360px);
    padding: 11px 12px 12px;
    border-radius: 22px;
  }

  .update-alert__icon {
    width: 38px;
    height: 38px;
    border-radius: 12px;
  }

  .update-alert__title {
    font-size: 0.88rem;
  }

  .update-alert__message {
    font-size: 0.81rem;
  }

  .update-alert__actions {
    margin-top: 10px;
    gap: 8px;
  }

  .update-alert__button {
    min-height: 36px;
    padding-inline: 12px;
    font-size: 0.78rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .update-alert,
  .update-alert__button {
    transition: none !important;
  }
}