.install-prompt {
  position: fixed;
  z-index: 120;
  top: max(12px, env(safe-area-inset-top));
  left: 50%;
  width: min(560px, calc(100% - 24px));
  padding: 12px;
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 18px;
  background: rgba(13, 13, 13, 0.96);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.62);
  color: #fff;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, calc(-100% - 30px));
  transition: opacity 220ms ease, transform 320ms cubic-bezier(0.22, 1, 0.36, 1);
  backdrop-filter: blur(18px);
}

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

.install-prompt__icon {
  width: 58px;
  height: 58px;
  display: block;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  background: #000;
  object-fit: cover;
}

.install-prompt__copy {
  min-width: 0;
}

.install-prompt__copy strong {
  display: block;
  font-size: 15px;
  line-height: 1.25;
}

.install-prompt__copy span {
  display: block;
  margin-top: 3px;
  color: #aaa;
  font-size: 12px;
  line-height: 1.4;
}

.install-prompt__actions {
  display: flex;
  align-items: center;
  gap: 7px;
}

.install-prompt button {
  width: auto;
  min-height: 38px;
  margin: 0;
  padding: 0 14px;
  border: 0;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.install-prompt__install {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fff;
}

.install-prompt__close {
  width: 38px !important;
  padding: 0 !important;
  background: rgba(255, 255, 255, 0.08);
  color: #aaa;
  font-size: 19px !important;
}

.install-prompt__close:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

@media (max-width: 520px) {
  .install-prompt {
    grid-template-columns: 52px minmax(0, 1fr) auto;
    gap: 10px;
    padding: 10px;
  }

  .install-prompt__icon {
    width: 52px;
    height: 52px;
    border-radius: 13px;
  }

  .install-prompt__actions {
    grid-column: 1 / -1;
    justify-content: flex-end;
  }

  .install-prompt__install {
    flex: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .install-prompt {
    transition: none;
  }
}