body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: #f6f9fc;
  color: #333;
  margin: 0;
  padding: 40px 20px;
}
.container {
  max-width: 600px;
  margin: 0 auto;
  background: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(50, 50, 93, 0.11), 0 1px 3px rgba(0, 0, 0, 0.08);
}
.text-center { text-align: center; }
.form-group { margin-bottom: 20px; }
label { display: block; margin-bottom: 8px; font-weight: bold; }
input[type="email"], input[type="text"] {
  width: 100%; padding: 10px; box-sizing: border-box; border: 1px solid #ccd0d5; border-radius: 4px; font-size: 16px;
}
button, .btn {
  display: inline-block; width: 100%; padding: 12px; background-color: #556cd6; color: white; border: none; border-radius: 4px; font-size: 16px; font-weight: bold; cursor: pointer; text-decoration: none; text-align: center;
}
button:disabled { background-color: #a3b2f1; cursor: not-allowed; }
.error-text { color: #df1b41; margin-bottom: 15px; font-size: 14px; font-weight: bold; }
.success-text { color: #24b47e; }
.license-box { background: #f4f6f8; padding: 15px; border-radius: 4px; font-size: 20px; margin: 20px 0; border: 1px dashed #556cd6; }
.spinner {
  border: 4px solid rgba(0,0,0,.1); width: 36px; height: 36px; border-radius: 50%; border-left-color: #556cd6; animation: spin 1s linear infinite; margin: 20px auto;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }