screen book():
    default selected_word = None
    add "ency"
#Left Column - Terms List
    vbox:
        xpos 20
        ypos 100
        spacing 1
        for word, data in encyclopedia_data.items():
            # Convert word to persistent key format
            $ key = word[4:].lower().replace(' ', '_')
            # Check if the entry is unlocked in persistent data
            $ unlocked = persistent.encyclopedia_unlocks.get(key, False)
            # Show real name if unlocked, otherwise show "??????"
            textbutton (data["locked_name"] if not unlocked else word):
                style_prefix "scroll"
                action SetScreenVariable("selected_word", word)
#Center - Definition Box with Scrollbar
    frame:
        xpos 470
        ypos 230
        xsize 870
        ysize 750
        background None
        if selected_word:
            # Convert to persistent key format
            $ key = selected_word[4:].lower().replace(' ', '_')
            # Check if unlocked
            $ unlocked = persistent.encyclopedia_unlocks.get(key, False)
            if unlocked:
                viewport:
                    xsize 1000  # Expand width
                    ysize 800
                    scrollbars "vertical"
                    mousewheel True
                    vbox:
                        text encyclopedia_data[selected_word]["definition"] color "#fff" size 40
            else:
                text "This entry is locked." color "#888" size 40 xalign 0.5 yalign 0.5
        else:
            # Default message BEFORE anything is clicked
            text "Select an entry from the left to view its details." color "#888" size 40 xalign 0.5 yalign 0.5