html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
body {
  font-family: 'Arial', sans-serif;
  background-color: #f8f9fc;
  color: #2a2a2a;
  margin: 0;
  padding: 0;
  text-align: center;
}
header {
  padding: 2rem;
  background: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}
.logo {
  width: 160px;
  margin-bottom: 1rem;
}
.hidden {
  display: none !important;
}