* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #0f1115;
  color: #e6e6e6;

  display: flex;
  justify-content: center;
  align-items: center;
}

#app {
  max-width: 520px;
  padding: 32px;
  text-align: center;
}

#app h1 {
  margin-bottom: 12px;
  font-size: 2rem;
  font-weight: 600;
}

#app p strong {
  font-weight: 500;
}

#app p {
  margin: 12px 0;
  line-height: 1.5;
  color: #b8b8b8;
}

#app {
  opacity: 1;
  transition: opacity 180ms ease;
}

#app.fade-out {
  opacity: 0;
}

#startBtn {
  margin-top: 24px;
  padding: 10px 22px;
  font-size: 1rem;
  font-weight: 500;

  background: none;
  color: #e6e6e6;
  border: 1px solid #444;
  border-radius: 6px;

  cursor: pointer;
}

#startBtn:hover {
  background: #1a1d24;
}

button {
  padding: 10px 22px;
  font-size: 1rem;
  font-weight: 500;

  background: none;
  color: #e6e6e6;
  border: 1px solid #444;
  border-radius: 6px;

  cursor: pointer;
}

button:hover {
  background: #1a1d24;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

button:disabled:hover {
  background: none;
}