body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f3f4f6;
  color: #111827;
}

.app {
  max-width: 520px;
  margin: 0 auto;
  padding: 16px;
}

.card {
  background: white;
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

button, select {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  margin-top: 8px;
}

.session {
  margin-top: 12px;
  padding: 12px;
  border-radius: 12px;
  background: #eef2ff;
}