body {
  font-family: system-ui, sans-serif;
  max-width: 34rem;
  margin: 2rem auto;
  padding: 0 1rem;
  background: #f6f7f9;
  color: #1f2937;
}
section {
  background: #fff;
  padding: 1.2rem;
  border-radius: 8px;
  box-shadow: 0 1px 4px #0002;
  margin: 1rem 0;
}
input, button, textarea {
  font: inherit;
  padding: 0.6rem;
  margin: 0.25rem 0;
  width: 100%;
  box-sizing: border-box;
}
button {
  cursor: pointer;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  background: #f1f5f9;
}
button:hover { background: #e2e8f0; }
button:disabled { opacity: 0.5; cursor: default; }
#status { font-weight: 600; }
#capture {
  border: 2px dashed #94a3b8;
  border-radius: 8px;
  padding: 2.5rem 1rem;
  text-align: center;
  color: #64748b;
  margin: 0.5rem 0;
  user-select: none;
  outline: none;
}
#capture:focus {
  border-color: #2563eb;
  color: #1e293b;
  background: #eff6ff;
}
#keys {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.4rem;
  margin: 0.5rem 0;
}
#keys button { margin: 0; }
#error { color: #b91c1c; }
code { word-break: break-all; }
#fp-confirm .note { color: #64748b; font-size: 0.9rem; }
#fp-value { font-size: 1.1rem; letter-spacing: 0.05em; }
/* Until E2E is established the key UI is inert. */
#control:not(.e2e-ready) #capture,
#control:not(.e2e-ready) #keys button,
#control:not(.e2e-ready) #send-text {
  opacity: 0.45;
  pointer-events: none;
}
@media (max-width: 480px) {
  #keys { grid-template-columns: 1fr 1fr; }
}