body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app-header {
  background-color: #282c34;
  padding: 20px;
  color: white;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: calc(10px + 2vmin);
  text-align: center;
}

.app-header h1 {
  margin-bottom: 20px;
}

.app-header p {
  margin: 10px 0;
}

.phone-link {
  color: #007bff;
  text-decoration: none;
  cursor: pointer;
  border-bottom: 1px dotted #007bff;
}

.phone-link:hover {
  color: #0056b3;
  border-bottom: 1px solid #0056b3;
}

.phone-link.calling {
  color: #28a745;
  font-weight: bold;
}

.phone-link.error {
  color: #dc3545;
}