body {
  font-family: 'Arial', sans-serif;
  margin: 0;
  padding: 20px;
  background-color: #f0f2f5;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1 {
  color: #1a73e8;
  text-align: center;
}

.start-form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

input {
  padding: 10px;
  border: 2px solid #1a73e8;
  border-radius: 5px;
  font-size: 16px;
}

button {
  background: #1a73e8;
  color: white;
  border: none;
  padding: 12px;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.3s;
}

button:hover {
  background: #1557b0;
}

button:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.error {
  color: #dc3545;
  font-size: 14px;
  margin-top: -10px;
  display: none;
}