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

body {
    font-family: 'Roboto', Georgia, 'Times New Roman', Times, serif;
    background-color: #fafafa;
    min-height: 100vh;
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

main {
    height: 70vh;
    max-width: clamp(100%, 50%, 50%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1rem;
}

.header-section {
   width: 100%;
   display: flex;
   flex-direction: column;
   gap: 0.5rem;
}

.header {
    font-size: clamp(2rem, 2.5rem, 3rem);

}
.header-message {
    font-size: clamp(0.8rem, 1.25rem, 1.5rem);
    margin-bottom: 1rem;
}

div ul {
     padding-left: 1.5rem; /* indent bullets */
}

#username, #password {
    width: 100%;
    margin-bottom: 1rem;
    padding: 0.5rem;
    font-size: clamp(1rem, 1.25rem, 1.5rem);
    background-color: #f1f1f1;
    border: none;
}

#username:focus, #password:focus {
    background-color: #ddd;
    outline: none;
}

.submit-btn {
background-color: #04AA6D;
  color: white;
  padding: 1rem;
  border: none;
  cursor: pointer;
  width: 100%;
  opacity: 0.9;
  font-size: clamp(1rem, 1.25rem, 1.5rem);
  font-weight: bold;
  margin-top: 0.5rem;
}

.submit-btn:hover {
    opacity: 1;
}

.register-link {
    text-align: center;
}

.status-message {
    color: red;
    font-weight: bold;
}