.app-update-banner {
  position: fixed;
  inset: 0;
  z-index: 2147483647;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.72);
  color: #000000;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
}

.app-update-card {
  width: min(420px, 100%);
  display: grid;
  gap: 14px;
  padding: 20px;
  border: 1px solid #d4d4d4;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
  text-align: center;
}

.app-update-card strong { font-size: 1.2rem; }
.app-update-card span { color: #4b5563; line-height: 1.45; }
.app-update-card button {
  min-height: 42px;
  border: 0;
  border-radius: 8px;
  color: #ffffff;
  background: #000000;
  font-weight: 700;
  cursor: pointer;
}
.app-update-card button:disabled { cursor: wait; opacity: 0.82; }
.app-update-loading { color: inherit; font-weight: 800; }

@media (prefers-color-scheme: dark) {
  .app-update-card { color: #ffffff; background: #000000; border-color: #ffffff; }
  .app-update-card span { color: #d4d4d4; }
  .app-update-card button { color: #000000; background: #ffffff; }
}