sign up form block.

<form class="signup-form">
  <h3 class="signup-title">Create your account</h3>
  <label class="signup-label" for="signup-name">Full name</label>
  <input class="signup-input" type="text" id="signup-name" placeholder="Jane Doe" required>
  <label class="signup-label" for="signup-email">Email</label>
  <input class="signup-input" type="email" id="signup-email" placeholder="jane@example.com" required>
  <label class="signup-label" for="signup-password">Password</label>
  <input class="signup-input" type="password" id="signup-password" placeholder="At least 8 characters" required>
  <button class="signup-btn" type="submit">Sign Up</button>
  <p class="signup-message"></p>
</form>

.signup-form {
  box-sizing: border-box;
  width: 280px;
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: 0 1px 3px rgba(17, 24, 39, 0.08);
  font-family: system-ui, -apple-system, sans-serif;
}
.signup-title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: #111827;
}
.signup-label {
  font-size: 12px;
  font-weight: 600;
  color: #374151;
  margin-top: 8px;
}
.signup-input {
  box-sizing: border-box;
  width: 100%;
  padding: 10px 12px;
  font-size: 14px;
  border: 1.5px solid #d1d5db;
  border-radius: 8px;
  outline: none;
  color: #111827;
  transition: border-color 0.2s ease;
}
.signup-input:focus {
  border-color: #3b82f6;
}
.signup-btn {
  margin-top: 16px;
  background-color: #3b82f6;
  color: #ffffff;
  border: none;
  padding: 11px 0;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.2s ease;
}
.signup-btn:hover {
  background-color: #2f6fe0;
}
.signup-message {
  min-height: 16px;
  font-size: 12px;
  font-weight: 600;
  margin: 10px 0 0;
}
.signup-message-error {
  color: #dc2626;
}
.signup-message-success {
  color: #16a34a;
}

var signupForm = document.querySelector('.signup-form');
var signupMessage = document.querySelector('.signup-message');
var signupPassword = document.getElementById('signup-password');
signupForm.addEventListener('submit', function (event) {
  event.preventDefault();
  signupMessage.classList.remove('signup-message-error', 'signup-message-success');
  if (signupPassword.value.length < 8) {
    signupMessage.textContent = 'Password must be at least 8 characters.';
    signupMessage.classList.add('signup-message-error');
    return;
  }
  signupMessage.textContent = 'Account created. Welcome aboard!';
  signupMessage.classList.add('signup-message-success');
});