body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  max-width: 600px;
  margin: 60px auto;
  padding: 20px;
  line-height: 1.6;
}

.card {
  border: 1px solid #e1e4e8;
  border-radius: 8px;
  padding: 32px;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.logo {
  margin-bottom: 16px;
}

h1 {
  color: #24292e;
}

button {
  background: #2ea44f;
  color: white;
  border: none;
  padding: 12px 24px;
  font-size: 16px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

button:hover {
  background: #2c974b;
}

button:disabled {
  background: #94d3a2;
  cursor: not-allowed;
}

.error {
  background: #fff3cd;
  border: 1px solid #ffc107;
  padding: 12px;
  border-radius: 4px;
  margin: 16px 0;
  color: #856404;
}

.success {
  background: #d4edda;
  border: 1px solid #28a745;
  padding: 12px;
  border-radius: 4px;
  margin: 16px 0;
  color: #155724;
}

.tshirt-link {
  display: inline-block;
  margin-top: 16px;
  padding: 12px 20px;
  background: #0366d6;
  color: white;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
}

.tshirt-link:hover {
  background: #0256c7;
}

.loading {
  text-align: center;
  padding: 20px;
  color: #666;
}

.hidden {
  display: none;
}

footer {
  margin-top: 40px;
  font-size: 10px;
  color: #666;
  text-align: center;
}

footer a {
  color: #0455a0;
  text-decoration: none;
}