#crimson-install-prompt {
  position: fixed;
  z-index: 2147483647;
  top: max(12px, env(safe-area-inset-top));
  left: 12px;
  right: 12px;
  max-width: 420px;
  max-height: 70vh;
  overflow: auto;
  margin: 0 auto;
  padding: 16px;
  box-sizing: border-box;
  border: 1px solid #ddd;
  border-radius: 16px;
  background: #fff;
  color: #202124;
  box-shadow: 0 4px 24px #0003;
  font: 16px/1.5 system-ui, sans-serif;
}
#crimson-install-prompt p { margin: 8px 0 12px; }
#crimson-install-prompt .actions { display: flex; gap: 12px; flex-wrap: wrap; }
#crimson-install-prompt button {
  min-height: 44px;
  padding: 8px 16px;
  border: 1px solid #b71c1c;
  border-radius: 8px;
  background: #fff;
  color: #b71c1c;
  font: inherit;
  cursor: pointer;
}
#crimson-install-prompt .install { background: #b71c1c; color: #fff; }
#crimson-install-prompt button:focus-visible { outline: 3px solid #1565c0; outline-offset: 3px; }
#crimson-install-prompt.iphone-guide { padding: 20px; }
#crimson-install-prompt.iphone-guide strong { font-size: 18px; }
#crimson-install-prompt.iphone-guide p { color: #5f6368; font-size: 14px; }
#crimson-install-prompt .install-steps {
  list-style: none;
  padding: 0;
  margin: 16px 0;
  display: grid;
  gap: 10px;
}
#crimson-install-prompt .install-steps li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) 40px;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 8px 10px;
  border-radius: 10px;
  background: #f5f6f8;
  font-size: 15px;
  font-weight: 500;
}
#crimson-install-prompt .step-number {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  color: #5f6368;
  font-size: 12px;
  font-weight: 600;
}
#crimson-install-prompt .step-icon { display: grid; place-items: center; color: #0066cc; }
#crimson-install-prompt .step-icon svg { width: 26px; height: 26px; }
#crimson-install-prompt .add-label { font-size: 15px; font-weight: 600; }
#crimson-install-prompt.iphone-guide .actions button {
  width: 100%;
  background: #b71c1c;
  color: white;
  font-weight: 600;
}
#crimson-install-help {
  position: fixed;
  z-index: 2147483647;
  right: max(12px, env(safe-area-inset-right));
  bottom: max(12px, env(safe-area-inset-bottom));
  max-width: calc(100% - 24px);
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid #b71c1c;
  border-radius: 24px;
  background: #fff;
  color: #b71c1c;
  box-shadow: 0 2px 12px #0002;
  font: 600 14px/1.5 system-ui, sans-serif;
  cursor: pointer;
}
#crimson-install-help:focus-visible { outline: 3px solid #1565c0; outline-offset: 3px; }