body {
  font-family: Arial, sans-serif;
  background: #f0f0f0;
  margin: 0;
  padding: 0;
}
.login-screen, .radio-interface {
  max-width: 500px;
  margin: 40px auto;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  padding: 32px 24px;
}
input, button {
  font-size: 1rem;
  padding: 8px;
  margin: 8px 0;
  border-radius: 4px;
  border: 1px solid #ccc;
}
button {
  background: #1976d2;
  color: #fff;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}
button:hover {
  background: #1565c0;
}
.status-indicator {
  padding: 4px 12px;
  border-radius: 12px;
  font-weight: bold;
  margin-left: 8px;
}
.status-ready { background: #e8f5e9; color: #388e3c; }
.status-offline { background: #ffebee; color: #c62828; }
.status-transmitting { background: #fffde7; color: #fbc02d; }
.activity-log {
  background: #f5f5f5;
  border-radius: 4px;
  padding: 12px;
  max-height: 180px;
  overflow-y: auto;
  font-size: 0.95rem;
}
.ptt-button {
  width: 100%;
  height: 60px;
  font-size: 1.2rem;
  background: #43a047;
  color: #fff;
  border: none;
  border-radius: 6px;
  margin: 16px 0;
  transition: background 0.2s;
}
.ptt-button.transmitting {
  background: #fbc02d;
  color: #222;
}