Amovx — Sign In<script> function validateUsername(input) { const hint = document.getElementById('usernameHint'); const val = input.value; if (val.length === 0) { hint.textContent = '4–15 characters, no spaces'; hint.style.color = 'var(--muted)'; } else if (val.length < 4) { hint.textContent = `Too short (${val.length}/4 min)`; hint.style.color = '#ef4444'; } else if (/\s/.test(val)) { hint.textContent = 'No spaces allowed'; hint.style.color = '#ef4444'; } else if (!/^[a-zA-Z0-9_]+$/.test(val)) { hint.textContent = 'Letters, numbers and underscores only'; hint.style.color = '#ef4444'; } else { hint.textContent = `${val.length}/15 ✓`; hint.style.color = '#22c55e'; } } </script>