* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f5f5f5;
  padding: 16px;
  line-height: 1.6;
  color: #1f2937;
  min-height: 100vh;
}

main {
  max-width: 600px;
  margin: 0 auto;
}

h1, h2, h3 {
  color: #1f2937;
  margin-bottom: 8px;
}

a {
  color: #4f46e5;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.btn-primary {
  background: #4f46e5;
  color: white;
  padding: 14px 24px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: background 0.2s;
}

.btn-primary:hover:not(:disabled) {
  background: #4338ca;
}

.btn-primary:disabled {
  background: #9ca3af;
  cursor: not-allowed;
}

.btn-secondary {
  background: #6b7280;
  color: white;
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-secondary:hover {
  background: #4b5563;
}

.input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  font-size: 16px;
  margin-bottom: 16px;
  transition: border-color 0.2s;
}

.input:focus {
  outline: none;
  border-color: #4f46e5;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.error {
  color: #dc2626;
  font-size: 14px;
  margin-top: 12px;
}

.loading {
  text-align: center;
  color: #6b7280;
  padding: 20px;
}