body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: #f5f5f5;
}

.signup-container {
  max-width: 400px;
  margin: 80px auto;
  padding: 24px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}

label {
  display: block;
  margin-top: 12px;
  font-weight: 500;
}

input {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  border-radius: 4px;
  border: 1px solid #ccc;
}

button {
  margin-top: 18px;
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  background: #2563eb;
  color: white;
}

.error {
  color: #b91c1c;
  margin-bottom: 8px;
}