turbovault-app/app/views/users/new.html.erb

<div class="max-w-md mx-auto">
  <h1 class="text-3xl font-bold mb-6">Sign Up</h1>
  
  <%= form_with model: @user, url: users_path, class: "space-y-4" do |f| %>
    <% if @user.errors.any? %>
      <div class="bg-red-100 border border-red-400 text-red-700 px-4 py-3 rounded">
        <ul>
          <% @user.errors.full_messages.each do |message| %>
            <li><%= message %></li>
          <% end %>
        </ul>
      </div>
    <% end %>
    
    <div>
      <%= f.label :username, class: "block text-sm font-medium text-gray-700" %>
      <%= f.text_field :username, autofocus: true, required: true, class: "mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500" %>
    </div>
    
    <div>
      <%= f.label :email, class: "block text-sm font-medium text-gray-700" %>
      <%= f.email_field :email, required: true, class: "mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500" %>
    </div>
    
    <div>
      <%= f.label :password, class: "block text-sm font-medium text-gray-700" %>
      <%= f.password_field :password, required: true, class: "mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500" %>
    </div>
    
    <div>
      <%= f.label :password_confirmation, class: "block text-sm font-medium text-gray-700" %>
      <%= f.password_field :password_confirmation, required: true, class: "mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500" %>
    </div>
    
    <div>
      <%= f.submit "Sign Up", class: "w-full px-4 py-2 bg-indigo-600 text-white rounded-md hover:bg-indigo-700" %>
    </div>
  <% end %>
  
  <div class="mt-4 text-center">
    <p class="text-gray-600">
      Already have an account? <%= link_to "Login", login_path, class: "text-indigo-600 hover:text-indigo-800" %>
    </p>
  </div>
</div>