Add Writing Desk paper copying and ink meter

NOTICE

@@ -6,6 +6,12 @@ It is not an official release of Mystcraft.
 Mystcraft Legacy source: https://github.com/Mystcraft/Mystcraft-Legacy
 Mystcraft Legacy copyright: XCompWiz and contributors
 Mystcraft Legacy license: GNU Lesser General Public License version 3
+The animated ink-vial item texture in this project is copied from Mystcraft
+Legacy's assets/mystcraft/textures/items/ink_vial.png under that license.
+The Notebook page atlas is copied from Legacy's assets/mystcraft/gui/bookui_pagel.png
+under the same license.
+The Writing Desk item texture is copied from Legacy's
+assets/mystcraft/textures/items/writingdesk.png under the same license.
 
 The initial build layout is derived from the official NeoForge 1.21.1
 ModDevGradle MDK: https://github.com/NeoForgeMDKs/MDK-1.21.1-ModDevGradle

README.md

@@ -13,8 +13,26 @@ have not been ported yet.
 
 Milestone 4 now includes stackable blank Pages plus server-created symbol,
 unresolved-symbol, and baseline link-panel states. Page visuals follow the
-legacy runtime-composition rules; written-page creation will become available
-through the Writing Desk work that follows.
+legacy runtime-composition rules. Craft an Ink Vial from two black dye, a glass
+bottle, and a water bucket; the bucket is returned. Hold a blank Page in one
+hand and use the Ink Vial in the other to prepare a baseline Link Panel Page.
+Each vial holds 16 ink units, and the default link-panel cost is two units.
+The spent vial returns a glass bottle. Server owners can adjust the symbol-copy
+and link-panel costs in the `writing` section of `rivencraft-server.toml`.
+The Writing Desk can copy a selected written page from its collection tabs.
+The Writing Desk is now craftable from planks, a glass bottle, and a feather.
+Its four collection tabs, paper input, ink vial input, empty glass-bottle return,
+16-unit ink meter, and inventory persist
+through world saves; breaking it drops stored contents. The desk screen is a
+functional foundation styled after Legacy's left tabs, central writing surface,
+and right inventory. Put vanilla paper (or a blank Rivencraft Page) in the
+upper-left slot and Ink Vials in the upper-right; a copy appears in the
+lower-left result slot when the selected page is valid. Taking it consumes one
+paper and, by default, one ink. An empty meter consumes a vial to refill and
+returns a vanilla glass bottle to the lower-right slot. Writing new symbols
+from a catalog remains future work.
+Selecting a stored page on the desk surface shows its Legacy-proportioned
+portrait preview and name above the player inventory.
 
 ## Linking Book
 

docs/ASSET_PROVENANCE.md

@@ -7,6 +7,8 @@ project's GNU LGPL v3 license. Rivencraft itself uses the same license.
 | Rivencraft asset | Upstream asset | Upstream revision | Changes |
 | --- | --- | --- | --- |
 | `assets/rivencraft/textures/item/page.png` | `assets/mystcraft/textures/items/page_background.png` | `9bc8ddc061845df0cd5ea47f4fdef773cff786ae` | Namespace/path rename only |
+| `assets/rivencraft/textures/gui/notebook_pages.png` | `assets/mystcraft/gui/bookui_pagel.png` | `9bc8ddc061845df0cd5ea47f4fdef773cff786ae` | Namespace/path rename only; Notebook draws the native 30×40 page at atlas coordinates `(156, 0)` |
+| `assets/rivencraft/textures/item/writing_desk.png` | `assets/mystcraft/textures/items/writingdesk.png` | `9bc8ddc061845df0cd5ea47f4fdef773cff786ae` | Namespace/path rename only |
 | `assets/rivencraft/textures/item/linking_book_unwritten.png` | `assets/mystcraft/textures/items/unlinked.png` | `9bc8ddc061845df0cd5ea47f4fdef773cff786ae` | Namespace/path rename only |
 | `assets/rivencraft/textures/item/page_link_panel.png` | `page_background.png` and `PageBuilder.BasicPageSprite` | `9bc8ddc061845df0cd5ea47f4fdef773cff786ae` | Reproduces the legacy 160 px scale, black panel at `(25,30)`–`(135,75)`, and 128 px resample |
 | `assets/rivencraft/textures/item/page_symbol*.png` and `page_unresolved.png` | `page_background.png`, `textures/symbolcomponents.png`, `WordData`, `ModSymbols`, and `PageBuilder.PageSprite` | `9bc8ddc061845df0cd5ea47f4fdef773cff786ae` | Static 1.21.1 renditions of the legacy runtime-composed four-word symbol pages; `normal_time` uses the legacy Full Length poem |

docs/WRITING_DATA.md

@@ -64,3 +64,30 @@ identifier. Built-in pages reproduce Mystcraft Legacy's four-word poem
 composition from its page background and symbol-component sheet. Data-pack
 symbols without a bundled resource-pack model use the legacy question-mark
 fallback while keeping their real identifier and display metadata.
+
+The Notebook surface displays pages by their persistent slot index instead of
+packing occupied pages together. Empty positions through the last placed page
+appear darkened. While carrying a Page, all available positions are shown for
+placement. The surface draws the native 30×40 portrait page region from
+Legacy's book UI atlas; symbols are layered at a uniform scale, while the
+square item models remain unchanged in inventories.
+
+## Ink and baseline link panels
+
+An Ink Vial is crafted from two black dye, a glass bottle, and a water bucket.
+The bucket remains after crafting. Each vial holds 16 ink units, stored in a
+persistent, network-synchronized component; only vials with identical remaining
+ink stack together. When depleted, a vial returns a glass bottle that can be
+used to craft another. The animated item texture comes from Mystcraft Legacy.
+
+The server config sets ink costs independently for symbol copying (default one
+unit) and baseline link-panel preparation (default two units). To prepare a
+panel, hold a blank Page in one hand and use an Ink Vial in the other. The
+server checks the held items, blank state, and sufficient ink before consuming
+anything. A stack of blank Pages yields exactly one Link Panel Page per use;
+if the inventory is full, the result is dropped instead of deleted. Symbol
+copying is implemented by the Writing Desk: it previews a copy of the selected
+resolved page, then spends paper and ink only when that copy is taken. The
+desk's 16-unit ink meter refills from an Ink Vial when needed and returns a
+vanilla glass bottle. Link-property modifiers are
+deferred beyond this baseline flow.

gradle.properties

@@ -35,7 +35,7 @@ mod_name=Rivencraft
 # The license of the mod. Review your options at https://choosealicense.com/. All Rights Reserved is the default.
 mod_license=LGPL-3.0-or-later
 # The mod version. Rivencraft uses the x.y.z.b policy documented in README.md.
-mod_version=0.3.2.3
+mod_version=0.3.5.2
 immersive_portals_version=6.0.7
 # The group ID for the mod. It is only important when publishing as an artifact to a Maven repository.
 # This should match the base package used for the mod sources.

src/main/java/net/dnorberg/rivencraft/Rivencraft.java

@@ -4,6 +4,7 @@ import com.mojang.logging.LogUtils;
 import net.dnorberg.rivencraft.registry.ModCreativeTabs;
 import net.dnorberg.rivencraft.registry.ModDataComponents;
 import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.registry.ModMenus;
 import net.dnorberg.rivencraft.registry.ModSounds;
 import net.dnorberg.rivencraft.registry.ModBlocks;
 import net.dnorberg.rivencraft.registry.ModBlockEntities;
@@ -41,6 +42,7 @@ public final class Rivencraft {
         ModBlocks.register(modEventBus);
         ModBlockEntities.register(modEventBus);
         ModItems.register(modEventBus);
+        ModMenus.register(modEventBus);
         ModSounds.register(modEventBus);
         ModCreativeTabs.register(modEventBus);
         NeoForge.EVENT_BUS.addListener(BookStandConversionHandler::onRightClickBlock);

src/main/java/net/dnorberg/rivencraft/block/WritingDeskBlock.java

@@ -0,0 +1,63 @@
+package net.dnorberg.rivencraft.block;
+
+import com.mojang.serialization.MapCodec;
+import net.dnorberg.rivencraft.block.entity.WritingDeskBlockEntity;
+import net.dnorberg.rivencraft.menu.WritingDeskMenu;
+import net.minecraft.core.BlockPos;
+import net.minecraft.network.chat.Component;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.Containers;
+import net.minecraft.world.InteractionResult;
+import net.minecraft.world.SimpleMenuProvider;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.context.BlockPlaceContext;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.BaseEntityBlock;
+import net.minecraft.world.level.block.RenderShape;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.StateDefinition;
+import net.minecraft.world.level.block.state.properties.BlockStateProperties;
+import net.minecraft.world.level.block.state.properties.DirectionProperty;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.phys.BlockHitResult;
+
+public final class WritingDeskBlock extends BaseEntityBlock {
+    public static final MapCodec<WritingDeskBlock> CODEC = simpleCodec(WritingDeskBlock::new);
+    public static final DirectionProperty FACING = BlockStateProperties.HORIZONTAL_FACING;
+
+    public WritingDeskBlock(Properties properties) {
+        super(properties);
+        registerDefaultState(stateDefinition.any().setValue(FACING, net.minecraft.core.Direction.NORTH));
+    }
+
+    @Override public MapCodec<? extends BaseEntityBlock> codec() { return CODEC; }
+    @Override protected void createBlockStateDefinition(StateDefinition.Builder<net.minecraft.world.level.block.Block, BlockState> builder) {
+        builder.add(FACING);
+    }
+    @Override public BlockState getStateForPlacement(BlockPlaceContext context) {
+        return defaultBlockState().setValue(FACING, context.getHorizontalDirection().getOpposite());
+    }
+    @Override protected RenderShape getRenderShape(BlockState state) { return RenderShape.MODEL; }
+    @Override public BlockEntity newBlockEntity(BlockPos pos, BlockState state) {
+        return new WritingDeskBlockEntity(pos, state);
+    }
+    @Override protected InteractionResult useWithoutItem(BlockState state, Level level, BlockPos pos,
+                                                          Player player, BlockHitResult hit) {
+        if (!level.isClientSide && player instanceof ServerPlayer serverPlayer
+                && level.getBlockEntity(pos) instanceof WritingDeskBlockEntity desk) {
+            serverPlayer.openMenu(new SimpleMenuProvider(
+                    (id, inventory, ignored) -> new WritingDeskMenu(id, inventory, desk),
+                    Component.translatable("container.rivencraft.writing_desk")),
+                    buffer -> buffer.writeBlockPos(pos));
+        }
+        return InteractionResult.sidedSuccess(level.isClientSide);
+    }
+    @Override protected void onRemove(BlockState state, Level level, BlockPos pos, BlockState replacement, boolean moving) {
+        if (!state.is(replacement.getBlock()) && !level.isClientSide
+                && level.getBlockEntity(pos) instanceof WritingDeskBlockEntity desk) {
+            Containers.dropContents(level, pos, desk);
+            level.updateNeighbourForOutputSignal(pos, this);
+        }
+        super.onRemove(state, level, pos, replacement, moving);
+    }
+}

src/main/java/net/dnorberg/rivencraft/block/entity/WritingDeskBlockEntity.java

@@ -0,0 +1,128 @@
+package net.dnorberg.rivencraft.block.entity;
+
+import net.dnorberg.rivencraft.item.InkVialItem;
+import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.writing.WritingInkService;
+import net.dnorberg.rivencraft.registry.ModBlockEntities;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.HolderLookup;
+import net.minecraft.core.NonNullList;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.Container;
+import net.minecraft.world.ContainerHelper;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.Items;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+
+/** Four collection tabs, paper, ink vials and empty-vial return are owned by the block. */
+public final class WritingDeskBlockEntity extends BlockEntity implements Container {
+    public static final int COLLECTIONS = 4;
+    public static final int INK = 4;
+    public static final int RETURN = 5;
+    public static final int PAPER = 6;
+    /** Unused by new desks; retained so old saves cannot silently lose slot contents. */
+    public static final int LEGACY_OUTPUT = 7;
+    public static final int SIZE = 8;
+    private NonNullList<ItemStack> items = NonNullList.withSize(SIZE, ItemStack.EMPTY);
+    private int activeCollection;
+    private int inkRemaining;
+
+    public WritingDeskBlockEntity(BlockPos pos, BlockState state) {
+        super(ModBlockEntities.WRITING_DESK.get(), pos, state);
+    }
+
+    public int activeCollection() { return activeCollection; }
+    public int inkRemaining() { return inkRemaining; }
+    public void setActiveCollection(int index) {
+        if (index >= 0 && index < COLLECTIONS && activeCollection != index) {
+            activeCollection = index;
+            setChanged();
+        }
+    }
+
+    @Override public int getContainerSize() { return SIZE; }
+    @Override public boolean isEmpty() { return items.stream().allMatch(ItemStack::isEmpty); }
+    @Override public ItemStack getItem(int slot) { return items.get(slot); }
+    @Override public ItemStack removeItem(int slot, int amount) {
+        ItemStack removed = ContainerHelper.removeItem(items, slot, amount);
+        if (!removed.isEmpty()) setChanged();
+        return removed;
+    }
+    @Override public ItemStack removeItemNoUpdate(int slot) { return ContainerHelper.takeItem(items, slot); }
+    @Override public void setItem(int slot, ItemStack stack) {
+        items.set(slot, stack);
+        if (stack.getCount() > getMaxStackSize()) stack.setCount(getMaxStackSize());
+        setChanged();
+    }
+    @Override public boolean stillValid(Player player) {
+        return level != null && level.isLoaded(worldPosition)
+                && level.getBlockEntity(worldPosition) == this
+                && player.distanceToSqr(worldPosition.getX() + 0.5, worldPosition.getY() + 0.5,
+                        worldPosition.getZ() + 0.5) <= 64.0;
+    }
+    @Override public boolean canPlaceItem(int slot, ItemStack stack) {
+        if (slot < COLLECTIONS) return stack.is(ModItems.NOTEBOOK.get()) || stack.is(ModItems.PAGE.get());
+        return switch (slot) {
+            case INK -> stack.is(ModItems.INK_VIAL.get());
+            case RETURN -> false;
+            case PAPER -> stack.is(Items.PAPER)
+                    || stack.is(ModItems.PAGE.get()) && PageItem.content(stack).kind()
+                    == net.dnorberg.rivencraft.writing.PageContent.Kind.BLANK;
+            case LEGACY_OUTPUT -> false;
+            default -> false;
+        };
+    }
+
+    /** The output is virtual; inputs are committed only after a result can be given to a player. */
+    public boolean canConsumeCopyMaterials() {
+        ItemStack paper = items.get(PAPER);
+        if (!canPlaceItem(PAPER, paper) || paper.isEmpty()) return false;
+        int cost = WritingInkService.symbolCopyCost();
+        if (inkRemaining >= cost) return true;
+        ItemStack vial = items.get(INK);
+        ItemStack returned = items.get(RETURN);
+        return vial.is(ModItems.INK_VIAL.get()) && inkRemaining + InkVialItem.remaining(vial) >= cost
+                && (returned.isEmpty() || returned.is(Items.GLASS_BOTTLE)
+                && returned.getCount() < returned.getMaxStackSize());
+    }
+
+    public boolean consumeCopyMaterials() {
+        if (!canConsumeCopyMaterials()) return false;
+        int cost = WritingInkService.symbolCopyCost();
+        if (inkRemaining < cost) {
+            ItemStack vial = items.get(INK);
+            inkRemaining += Math.clamp(InkVialItem.remaining(vial), 0, InkVialItem.CAPACITY);
+            vial.shrink(1);
+            if (vial.isEmpty()) items.set(INK, ItemStack.EMPTY);
+            ItemStack returned = items.get(RETURN);
+            if (returned.isEmpty()) items.set(RETURN, new ItemStack(Items.GLASS_BOTTLE));
+            else returned.grow(1);
+        }
+        inkRemaining -= cost;
+        removeItem(PAPER, 1);
+        setChanged();
+        return true;
+    }
+    @Override public void clearContent() {
+        items.clear();
+        items = NonNullList.withSize(SIZE, ItemStack.EMPTY);
+        inkRemaining = 0;
+        setChanged();
+    }
+    @Override protected void loadAdditional(CompoundTag tag, HolderLookup.Provider registries) {
+        super.loadAdditional(tag, registries);
+        items = NonNullList.withSize(SIZE, ItemStack.EMPTY);
+        ContainerHelper.loadAllItems(tag, items, registries);
+        activeCollection = Math.clamp(tag.getInt("ActiveCollection"), 0, COLLECTIONS - 1);
+        inkRemaining = Math.clamp(tag.getInt("InkRemaining"), 0, InkVialItem.CAPACITY);
+    }
+    @Override protected void saveAdditional(CompoundTag tag, HolderLookup.Provider registries) {
+        super.saveAdditional(tag, registries);
+        ContainerHelper.saveAllItems(tag, items, registries);
+        tag.putInt("ActiveCollection", activeCollection);
+        tag.putInt("InkRemaining", inkRemaining);
+    }
+}

src/main/java/net/dnorberg/rivencraft/client/ClientEvents.java

@@ -12,6 +12,10 @@ import net.neoforged.fml.common.EventBusSubscriber;
 import net.neoforged.fml.event.lifecycle.FMLClientSetupEvent;
 import net.neoforged.neoforge.common.NeoForge;
 import net.neoforged.neoforge.client.event.EntityRenderersEvent;
+import net.neoforged.neoforge.client.event.RegisterMenuScreensEvent;
+import net.dnorberg.rivencraft.client.screen.NotebookScreen;
+import net.dnorberg.rivencraft.client.screen.WritingDeskScreen;
+import net.dnorberg.rivencraft.registry.ModMenus;
 
 @EventBusSubscriber(modid = Rivencraft.MOD_ID, value = Dist.CLIENT)
 public final class ClientEvents {
@@ -23,6 +27,12 @@ public final class ClientEvents {
         event.registerBlockEntityRenderer(ModBlockEntities.BOOK_STAND.get(), BookStandRenderer::new);
     }
 
+    @SubscribeEvent
+    public static void registerScreens(RegisterMenuScreensEvent event) {
+        event.register(ModMenus.NOTEBOOK.get(), NotebookScreen::new);
+        event.register(ModMenus.WRITING_DESK.get(), WritingDeskScreen::new);
+    }
+
     @SubscribeEvent
     public static void clientSetup(FMLClientSetupEvent event) {
         event.enqueueWork(() -> ItemProperties.register(

src/main/java/net/dnorberg/rivencraft/client/screen/NotebookScreen.java

@@ -0,0 +1,320 @@
+package net.dnorberg.rivencraft.client.screen;
+
+import java.util.Locale;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.menu.NotebookMenu;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.minecraft.client.gui.GuiGraphics;
+import net.minecraft.client.gui.components.Button;
+import net.minecraft.client.gui.components.EditBox;
+import net.minecraft.client.gui.screens.inventory.AbstractContainerScreen;
+import net.minecraft.network.chat.Component;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.entity.player.Inventory;
+import net.minecraft.world.inventory.ClickType;
+import net.minecraft.world.item.ItemStack;
+
+/** A page surface modelled on Legacy's folder GUI, backed by the Notebook menu. */
+public final class NotebookScreen extends AbstractContainerScreen<NotebookMenu> {
+    private static final int SURFACE_TOP = 20;
+    private static final int SURFACE_BOTTOM = 132;
+    private static final int SURFACE_RIGHT = 156;
+    private static final int PAGE_WIDTH = 30;
+    private static final int PAGE_HEIGHT = 40;
+    private static final int PAGE_STEP_X = 31;
+    private static final int PAGE_STEP_Y = 41;
+    private static final int PAGE_COLUMNS = 5;
+    private static final ResourceLocation PAGE_ATLAS = texture("gui/notebook_pages");
+    private static final ResourceLocation GENERIC_SYMBOL = texture("item/page_symbol");
+    private static final ResourceLocation UNRESOLVED_SYMBOL = texture("item/page_unresolved");
+    private static final ResourceLocation STANDARD_TERRAIN = texture("item/page_symbol_terrain_standard");
+    private static final ResourceLocation NATIVE_BIOMES = texture("item/page_symbol_biome_native");
+    private static final ResourceLocation NORMAL_LIGHTING = texture("item/page_symbol_lighting_normal");
+    private static final ResourceLocation NORMAL_WEATHER = texture("item/page_symbol_weather_normal");
+    private static final ResourceLocation NORMAL_TIME = texture("item/page_symbol_celestial_normal_time");
+    private static final ResourceLocation CAVES = texture("item/page_symbol_feature_caves");
+    private EditBox textInput;
+    private boolean draggingScrollbar;
+    private boolean surfaceClickPendingRelease;
+    private int selectedSlot = -1;
+    private int scroll;
+
+    public NotebookScreen(NotebookMenu menu, Inventory inventory, Component title) {
+        super(menu, inventory, title);
+        imageWidth = 176;
+        imageHeight = 213;
+        inventoryLabelY = 123;
+    }
+
+    @Override
+    protected void init() {
+        super.init();
+        Button sortButton = Button.builder(Component.literal("AZ"), button -> {})
+                .bounds(leftPos, topPos, 18, 18).build();
+        Button allButton = Button.builder(Component.literal("ALL"), button -> {})
+                .bounds(leftPos + 20, topPos, 26, 18).build();
+        sortButton.active = false;
+        allButton.active = false;
+        addRenderableWidget(sortButton);
+        addRenderableWidget(allButton);
+        textInput = new EditBox(font, leftPos + 48, topPos, 128, 18,
+                Component.translatable("screen.rivencraft.notebook.search"));
+        textInput.setMaxLength(32);
+        textInput.setHint(Component.translatable("screen.rivencraft.notebook.search"));
+        textInput.setResponder(value -> scroll = 0);
+        addRenderableWidget(textInput);
+    }
+
+    @Override
+    public void render(GuiGraphics graphics, int mouseX, int mouseY, float partialTick) {
+        super.render(graphics, mouseX, mouseY, partialTick);
+        int pageSlots = displayedPageSlots();
+        scroll = Math.min(scroll, maxScroll(pageSlots));
+        graphics.enableScissor(leftPos, topPos + SURFACE_TOP, leftPos + SURFACE_RIGHT,
+                topPos + SURFACE_BOTTOM);
+        for (int index = 0; index < pageSlots; index++) {
+            int x = leftPos + (index % PAGE_COLUMNS) * PAGE_STEP_X;
+            int y = topPos + SURFACE_TOP + (index / PAGE_COLUMNS) * PAGE_STEP_Y - scroll;
+            if (y + PAGE_HEIGHT > topPos + SURFACE_TOP && y < topPos + SURFACE_BOTTOM) {
+                drawPage(graphics, index, x, y);
+            }
+        }
+        graphics.disableScissor();
+        drawScrollbar(graphics, pageSlots);
+        int hovered = pageAt(mouseX, mouseY);
+        if (!menu.getCarried().isEmpty() && inSurface(mouseX, mouseY)) {
+            graphics.renderItem(menu.getCarried(), mouseX - 8, mouseY - 8);
+        } else if (hovered >= 0 && !menu.getSlot(hovered).getItem().isEmpty()) {
+            ItemStack page = menu.getSlot(hovered).getItem();
+            if (matchesSearch(page)) graphics.renderTooltip(font, page, mouseX, mouseY);
+        } else {
+            renderTooltip(graphics, mouseX, mouseY);
+        }
+    }
+
+    @Override
+    protected void renderBg(GuiGraphics graphics, float partialTick, int mouseX, int mouseY) {
+        graphics.fill(leftPos, topPos + SURFACE_TOP, leftPos + SURFACE_RIGHT,
+                topPos + SURFACE_BOTTOM, 0xB0000000);
+        drawBeveledPanel(graphics, leftPos, topPos + 132, imageWidth, 81);
+        for (int row = 0; row < 3; row++) {
+            for (int column = 0; column < 9; column++) drawSlot(graphics, 7 + column * 18, 134 + row * 18);
+        }
+        for (int column = 0; column < 9; column++) drawSlot(graphics, 7 + column * 18, 192);
+    }
+
+    @Override
+    protected void renderLabels(GuiGraphics graphics, int mouseX, int mouseY) {
+        graphics.drawString(font, playerInventoryTitle, inventoryLabelX, inventoryLabelY, 0x404040, false);
+    }
+
+    @Override
+    public boolean mouseClicked(double mouseX, double mouseY, int button) {
+        if (inScrollbar(mouseX, mouseY) && button == 0) {
+            draggingScrollbar = true;
+            setScrollFromMouse(mouseY, displayedPageSlots());
+            return true;
+        }
+        int index = pageAt(mouseX, mouseY);
+        if (index >= 0 && (button == 0 || button == 1)) {
+            ItemStack page = menu.getSlot(index).getItem();
+            if ((!page.isEmpty() && !matchesSearch(page))
+                    || (page.isEmpty() && !menu.getCarried().is(ModItems.PAGE.get()))) {
+                return true;
+            }
+            setFocused(null);
+            textInput.setFocused(false);
+            selectedSlot = index;
+            slotClicked(menu.getSlot(index), index, button, ClickType.PICKUP);
+            surfaceClickPendingRelease = true;
+            return true;
+        }
+        return super.mouseClicked(mouseX, mouseY, button);
+    }
+
+    @Override
+    public boolean mouseDragged(double mouseX, double mouseY, int button, double dragX, double dragY) {
+        if (draggingScrollbar && button == 0) {
+            setScrollFromMouse(mouseY, displayedPageSlots());
+            return true;
+        }
+        return super.mouseDragged(mouseX, mouseY, button, dragX, dragY);
+    }
+
+    @Override
+    public boolean mouseReleased(double mouseX, double mouseY, int button) {
+        if (draggingScrollbar || surfaceClickPendingRelease) {
+            draggingScrollbar = false;
+            surfaceClickPendingRelease = false;
+            return true;
+        }
+        draggingScrollbar = false;
+        return super.mouseReleased(mouseX, mouseY, button);
+    }
+
+    @Override
+    public boolean mouseScrolled(double mouseX, double mouseY, double scrollX, double scrollY) {
+        if (inSurface(mouseX, mouseY) || inScrollbar(mouseX, mouseY)) {
+            scroll = Math.clamp(scroll - (int)Math.signum(scrollY) * 20,
+                    0, maxScroll(displayedPageSlots()));
+            return true;
+        }
+        return super.mouseScrolled(mouseX, mouseY, scrollX, scrollY);
+    }
+
+    @Override
+    public boolean keyPressed(int keyCode, int scanCode, int modifiers) {
+        if (textInput.isFocused()) {
+            if (keyCode == 256) {
+                setFocused(null);
+                textInput.setFocused(false);
+            } else {
+                textInput.keyPressed(keyCode, scanCode, modifiers);
+            }
+            // EditBox does not consume ordinary letter key presses; the matching charTyped
+            // event handles text input. Do not pass them to the container's inventory keys.
+            return true;
+        }
+        if (!textInput.isFocused() && selectedSlot >= 0 && (keyCode == 263 || keyCode == 262)) {
+            moveSelected(keyCode == 262);
+            return true;
+        }
+        return super.keyPressed(keyCode, scanCode, modifiers);
+    }
+
+    private int displayedPageSlots() {
+        if (menu.getCarried().is(ModItems.PAGE.get())) {
+            return NotebookMenu.NOTEBOOK_SLOTS;
+        }
+        for (int index = NotebookMenu.NOTEBOOK_SLOTS - 1; index >= 0; index--) {
+            if (!menu.getSlot(index).getItem().isEmpty()) {
+                return index + 1;
+            }
+        }
+        return 0;
+    }
+
+    private boolean matchesSearch(ItemStack page) {
+        return textInput.getValue().isBlank()
+                || page.getHoverName().getString().toLowerCase(Locale.ROOT)
+                        .contains(textInput.getValue().toLowerCase(Locale.ROOT));
+    }
+
+    private int pageAt(double mouseX, double mouseY) {
+        if (!inSurface(mouseX, mouseY)) return -1;
+        int localX = (int)mouseX - leftPos;
+        int localY = (int)mouseY - topPos - SURFACE_TOP + scroll;
+        int column = localX / PAGE_STEP_X;
+        int index = (localY / PAGE_STEP_Y) * PAGE_COLUMNS + column;
+        return column < PAGE_COLUMNS && localX % PAGE_STEP_X < PAGE_WIDTH
+                && localY % PAGE_STEP_Y < PAGE_HEIGHT && index < displayedPageSlots()
+                ? index : -1;
+    }
+
+    private boolean inSurface(double mouseX, double mouseY) {
+        return mouseX >= leftPos && mouseX < leftPos + SURFACE_RIGHT
+                && mouseY >= topPos + SURFACE_TOP && mouseY < topPos + SURFACE_BOTTOM;
+    }
+
+    private boolean inScrollbar(double mouseX, double mouseY) {
+        return mouseX >= leftPos + SURFACE_RIGHT && mouseX < leftPos + imageWidth
+                && mouseY >= topPos + SURFACE_TOP && mouseY < topPos + SURFACE_BOTTOM;
+    }
+
+    private int maxScroll(int pageCount) {
+        int rows = (pageCount + PAGE_COLUMNS - 1) / PAGE_COLUMNS;
+        return Math.max(0, rows * PAGE_STEP_Y - (SURFACE_BOTTOM - SURFACE_TOP));
+    }
+
+    private void setScrollFromMouse(double mouseY, int pageCount) {
+        int maximum = maxScroll(pageCount);
+        double fraction = (mouseY - topPos - SURFACE_TOP - 10.0)
+                / (SURFACE_BOTTOM - SURFACE_TOP - 20.0);
+        scroll = Math.clamp((int)(Math.clamp(fraction, 0.0, 1.0) * maximum), 0, maximum);
+    }
+
+    private void drawScrollbar(GuiGraphics graphics, int pageCount) {
+        int x = leftPos + SURFACE_RIGHT;
+        int y = topPos + SURFACE_TOP;
+        int height = SURFACE_BOTTOM - SURFACE_TOP;
+        graphics.fill(x, y, x + 20, y + height, 0xFF858585);
+        graphics.renderOutline(x, y, 20, height, 0xFF262626);
+        for (int line = y + 5; line < y + height - 4; line += 5) {
+            graphics.fill(x + 4, line, x + 16, line + 1, 0xFFB7B7B7);
+        }
+        int maximum = maxScroll(pageCount);
+        int thumbY = y + 4 + (maximum == 0 ? 0 : scroll * (height - 23) / maximum);
+        graphics.fill(x + 4, thumbY, x + 16, thumbY + 15, 0xFFC9C9C9);
+        graphics.renderOutline(x + 4, thumbY, 12, 15, 0xFF414141);
+    }
+
+    private void drawPage(GuiGraphics graphics, int index, int x, int y) {
+        ItemStack page = menu.getSlot(index).getItem();
+        boolean dimmed = page.isEmpty() || !matchesSearch(page);
+        // Legacy's Notebook draws the atlas' native 30x40 page, not a stretched item icon.
+        graphics.blit(PAGE_ATLAS, x, y, PAGE_WIDTH, PAGE_HEIGHT,
+                156, 0, PAGE_WIDTH, PAGE_HEIGHT, 256, 256);
+        if (!page.isEmpty()) {
+            switch (PageItem.content(page).kind()) {
+                case BLANK -> { }
+                case LINK_PANEL -> graphics.fill(x + 5, y + 6, x + 25, y + 20, 0xFF000000);
+                case SYMBOL, UNRESOLVED_SYMBOL -> graphics.blit(symbolTexture(page), x + 1, y + 6,
+                        28, 28, 16, 16, 96, 96, 128, 128);
+            }
+        }
+        if (dimmed) {
+            graphics.fill(x, y, x + PAGE_WIDTH, y + PAGE_HEIGHT, 0xB8000000);
+        }
+        if (index == selectedSlot && !page.isEmpty()) {
+            graphics.renderOutline(x, y, PAGE_WIDTH, PAGE_HEIGHT, 0xFFFFD061);
+        }
+    }
+
+    static ResourceLocation symbolTexture(ItemStack page) {
+        var content = PageItem.content(page);
+        if (content.kind() == net.dnorberg.rivencraft.writing.PageContent.Kind.UNRESOLVED_SYMBOL) {
+            return UNRESOLVED_SYMBOL;
+        }
+        return switch (content.symbol().orElseThrow().id().toString()) {
+            case "rivencraft:terrain/standard" -> STANDARD_TERRAIN;
+            case "rivencraft:biome/native" -> NATIVE_BIOMES;
+            case "rivencraft:lighting/normal" -> NORMAL_LIGHTING;
+            case "rivencraft:weather/normal" -> NORMAL_WEATHER;
+            case "rivencraft:celestial/normal_time" -> NORMAL_TIME;
+            case "rivencraft:feature/caves" -> CAVES;
+            default -> GENERIC_SYMBOL;
+        };
+    }
+
+    private static ResourceLocation texture(String path) {
+        return ResourceLocation.fromNamespaceAndPath(Rivencraft.MOD_ID, "textures/" + path + ".png");
+    }
+
+    private void moveSelected(boolean next) {
+        int target = selectedSlot + (next ? 1 : -1);
+        if (selectedSlot < 0 || target < 0 || target >= NotebookMenu.NOTEBOOK_SLOTS
+                || menu.getSlot(selectedSlot).getItem().isEmpty()) return;
+        int buttonId = (next ? NotebookMenu.MOVE_NEXT_BASE : NotebookMenu.MOVE_PREVIOUS_BASE) + selectedSlot;
+        if (menu.clickMenuButton(minecraft.player, buttonId)) {
+            minecraft.gameMode.handleInventoryButtonClick(menu.containerId, buttonId);
+            selectedSlot = target;
+        }
+    }
+
+    private static void drawBeveledPanel(GuiGraphics graphics, int x, int y, int width, int height) {
+        graphics.fill(x, y, x + width, y + height, 0xFFC6C6C6);
+        graphics.fill(x, y, x + width, y + 2, 0xFFFFFFFF);
+        graphics.fill(x, y, x + 2, y + height, 0xFFFFFFFF);
+        graphics.fill(x, y + height - 2, x + width, y + height, 0xFF555555);
+        graphics.fill(x + width - 2, y, x + width, y + height, 0xFF555555);
+    }
+
+    private void drawSlot(GuiGraphics graphics, int x, int y) {
+        graphics.fill(leftPos + x, topPos + y, leftPos + x + 18, topPos + y + 18, 0xFF8B8B8B);
+        graphics.fill(leftPos + x, topPos + y, leftPos + x + 18, topPos + y + 1, 0xFF373737);
+        graphics.fill(leftPos + x, topPos + y, leftPos + x + 1, topPos + y + 18, 0xFF373737);
+        graphics.fill(leftPos + x + 17, topPos + y, leftPos + x + 18, topPos + y + 18, 0xFFFFFFFF);
+        graphics.fill(leftPos + x, topPos + y + 17, leftPos + x + 18, topPos + y + 18, 0xFFFFFFFF);
+    }
+}

src/main/java/net/dnorberg/rivencraft/client/screen/WritingDeskScreen.java

@@ -0,0 +1,180 @@
+package net.dnorberg.rivencraft.client.screen;
+
+import java.util.List;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.menu.WritingDeskMenu;
+import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.writing.NotebookContents;
+import net.minecraft.client.gui.GuiGraphics;
+import net.minecraft.client.gui.screens.inventory.AbstractContainerScreen;
+import net.minecraft.network.chat.Component;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.entity.player.Inventory;
+import net.minecraft.world.item.ItemStack;
+
+/** Functional storage surface; full Legacy transcription controls are a later Milestone 4 slice. */
+public final class WritingDeskScreen extends AbstractContainerScreen<WritingDeskMenu> {
+    private static final ResourceLocation PAGE_ATLAS = ResourceLocation.fromNamespaceAndPath(
+            Rivencraft.MOD_ID, "textures/gui/notebook_pages.png");
+    private int lastCollection = -1;
+    private int selectedPage;
+    private int scrollRows;
+
+    public WritingDeskScreen(WritingDeskMenu menu, Inventory inventory, Component title) {
+        super(menu, inventory, title);
+        imageWidth = 398;
+        imageHeight = 176;
+        titleLabelX = 222;
+        inventoryLabelX = 224;
+        inventoryLabelY = 79;
+    }
+
+    @Override public void renderBackground(GuiGraphics graphics, int mouseX, int mouseY, float partialTick) {
+        // Legacy leaves the world visible around the desk instead of dimming it.
+    }
+
+    @Override protected void renderBg(GuiGraphics graphics, float partialTick, int mouseX, int mouseY) {
+        int x = leftPos;
+        int y = topPos;
+        graphics.fill(x + 4, y + 8, x + 216, y + 174, 0xFF383230);
+        graphics.fill(x + 44, y + 14, x + 210, y + 170, 0xFF221B1A);
+        graphics.fill(x + 218, y + 4, x + 396, y + 174, 0xFF555454);
+        graphics.fill(x + 220, y + 6, x + 394, y + 172, 0xFFB7B7B7);
+        for (int i = 0; i < 4; i++) {
+            graphics.fill(x + 6, y + 16 + i * 37, x + 40, y + 48 + i * 37,
+                    i == menu.activeCollection() ? 0xFF7777B6 : 0xFF999999);
+            slotFrame(graphics, 12, 20 + i * 37);
+        }
+        slotFrame(graphics, 370, 20);
+        slotFrame(graphics, 228, 20);
+        slotFrame(graphics, 228, 57);
+        slotFrame(graphics, 370, 57);
+        graphics.fill(x + 350, y + 20, x + 364, y + 75, 0xFF303035);
+        graphics.fill(x + 352, y + 22, x + 362, y + 73, 0xFF15151B);
+        int filled = 51 * menu.inkRemaining() / 16;
+        if (filled > 0) graphics.fill(x + 352, y + 73 - filled, x + 362, y + 73, 0xFF6666AA);
+        graphics.renderOutline(x + 350, y + 20, 14, 55, 0xFF484848);
+        for (int row = 0; row < 3; row++) {
+            for (int column = 0; column < 9; column++) slotFrame(graphics, 224 + column * 18, 91 + row * 18);
+        }
+        for (int column = 0; column < 9; column++) slotFrame(graphics, 224 + column * 18, 149);
+    }
+
+    private void slotFrame(GuiGraphics graphics, int x, int y) {
+        graphics.fill(leftPos + x - 1, topPos + y - 1,
+                leftPos + x + 17, topPos + y + 17, 0xFF4D4D4D);
+        graphics.fill(leftPos + x, topPos + y,
+                leftPos + x + 16, topPos + y + 16, 0xFF858585);
+    }
+
+    @Override protected void renderLabels(GuiGraphics graphics, int mouseX, int mouseY) {
+        graphics.drawString(font, playerInventoryTitle, inventoryLabelX, inventoryLabelY, 0x404040, false);
+    }
+
+    @Override public void render(GuiGraphics graphics, int mouseX, int mouseY, float partialTick) {
+        super.render(graphics, mouseX, mouseY, partialTick);
+        renderCollection(graphics);
+        renderTooltip(graphics, mouseX, mouseY);
+        if (mouseX >= leftPos + 350 && mouseX < leftPos + 364
+                && mouseY >= topPos + 20 && mouseY < topPos + 75) {
+            graphics.renderTooltip(font, Component.translatable("screen.rivencraft.writing_desk.ink",
+                    menu.inkRemaining(), 16), mouseX, mouseY);
+        }
+    }
+
+    private List<ItemStack> pages() {
+        ItemStack collection = menu.getSlot(menu.activeCollection()).getItem();
+        if (collection.is(ModItems.PAGE.get())) return List.of(collection);
+        if (collection.is(ModItems.NOTEBOOK.get())) {
+            return collection.getOrDefault(ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages();
+        }
+        return List.of();
+    }
+
+    private void renderCollection(GuiGraphics graphics) {
+        List<ItemStack> pages = pages();
+        if (lastCollection != menu.activeCollection()) {
+            lastCollection = menu.activeCollection();
+            scrollRows = 0;
+            selectedPage = 0;
+        }
+        int last = -1;
+        for (int i = 0; i < pages.size(); i++) if (!pages.get(i).isEmpty()) last = i;
+        for (int i = scrollRows * 5; i <= last && i < scrollRows * 5 + 15; i++) {
+            int column = i % 5;
+            int row = i / 5 - scrollRows;
+            ItemStack page = pages.get(i);
+            int x = leftPos + 48 + column * 31;
+            int y = topPos + 18 + row * 41;
+            drawPage(graphics, page, x, y);
+            if (page.isEmpty()) graphics.fill(x, y, x + 30, y + 40, 0xB8000000);
+            if (i == selectedPage && !page.isEmpty()) graphics.renderOutline(x, y, 30, 40, 0xFFFFD061);
+        }
+        if (selectedPage >= pages.size() || pages.get(selectedPage).isEmpty()) return;
+        ItemStack selected = pages.get(selectedPage);
+        graphics.pose().pushPose();
+        graphics.pose().translate(leftPos + 294, topPos + 12, 0);
+        graphics.pose().scale(1.35F, 1.35F, 1.0F);
+        drawPage(graphics, selected, 0, 0);
+        graphics.pose().popPose();
+        String title = font.plainSubstrByWidth(selected.getHoverName().getString(), 112);
+        graphics.fill(leftPos + 251, topPos + 64, leftPos + 365, topPos + 77, 0xFF202020);
+        graphics.drawString(font, title, leftPos + 254, topPos + 67, 0xFFE0E0E0, false);
+    }
+
+    private void drawPage(GuiGraphics graphics, ItemStack page, int x, int y) {
+        graphics.blit(PAGE_ATLAS, x, y, 30, 40, 156, 0, 30, 40, 256, 256);
+        if (page.isEmpty()) return;
+        switch (PageItem.content(page).kind()) {
+            case BLANK -> { }
+            case LINK_PANEL -> graphics.fill(x + 5, y + 6, x + 25, y + 20, 0xFF000000);
+            case SYMBOL, UNRESOLVED_SYMBOL -> graphics.blit(NotebookScreen.symbolTexture(page), x + 1, y + 6,
+                    28, 28, 16, 16, 96, 96, 128, 128);
+        }
+    }
+
+    @Override public boolean mouseClicked(double mouseX, double mouseY, int button) {
+        if (button == 0) {
+            int x = (int) mouseX - leftPos - 48;
+            int y = (int) mouseY - topPos - 18;
+            if (x >= 0 && x < 155 && y >= 0 && y < 123) {
+                int column = x / 31;
+                int row = y / 41;
+                int index = (row + scrollRows) * 5 + column;
+                List<ItemStack> pages = pages();
+                if (x % 31 < 30 && y % 41 < 40 && index < pages.size()
+                        && !pages.get(index).isEmpty()) {
+                    selectedPage = index;
+                    if (minecraft != null && minecraft.gameMode != null) {
+                        minecraft.gameMode.handleInventoryButtonClick(menu.containerId, 16 + index);
+                    }
+                }
+                return true;
+            }
+        }
+        if (button == 0 && mouseX >= leftPos + 29 && mouseX < leftPos + 40) {
+            for (int i = 0; i < 4; i++) {
+                int top = topPos + 16 + i * 37;
+                if (mouseY >= top && mouseY < top + 32) {
+                    if (minecraft != null && minecraft.gameMode != null) {
+                        minecraft.gameMode.handleInventoryButtonClick(menu.containerId, i);
+                    }
+                    return true;
+                }
+            }
+        }
+        return super.mouseClicked(mouseX, mouseY, button);
+    }
+
+    @Override public boolean mouseScrolled(double mouseX, double mouseY, double scrollX, double scrollY) {
+        if (mouseX >= leftPos + 48 && mouseX < leftPos + 203
+                && mouseY >= topPos + 18 && mouseY < topPos + 141) {
+            int rows = (pages().size() + 4) / 5;
+            scrollRows = Math.clamp(scrollRows - (int) Math.signum(scrollY), 0, Math.max(0, rows - 3));
+            return true;
+        }
+        return super.mouseScrolled(mouseX, mouseY, scrollX, scrollY);
+    }
+}

src/main/java/net/dnorberg/rivencraft/config/RivencraftConfig.java

@@ -15,6 +15,8 @@ public final class RivencraftConfig {
 
     public static final ModConfigSpec SPEC;
     private static final ModConfigSpec.EnumValue<ReturnLinkMode> RETURN_LINK_MODE;
+    private static final ModConfigSpec.IntValue SYMBOL_INK_COST;
+    private static final ModConfigSpec.IntValue LINK_PANEL_INK_COST;
 
     static {
         ModConfigSpec.Builder builder = new ModConfigSpec.Builder();
@@ -25,6 +27,12 @@ public final class RivencraftConfig {
                 )
                 .defineEnum("return_link_mode", ReturnLinkMode.ON_CREATION);
         builder.pop();
+        builder.push("writing");
+        SYMBOL_INK_COST = builder.comment("Ink units consumed when the Writing Desk copies one symbol page.")
+                .defineInRange("symbol_ink_cost", 1, 1, 16);
+        LINK_PANEL_INK_COST = builder.comment("Ink units consumed when preparing one baseline link-panel page.")
+                .defineInRange("link_panel_ink_cost", 2, 1, 16);
+        builder.pop();
         SPEC = builder.build();
     }
 
@@ -34,4 +42,12 @@ public final class RivencraftConfig {
     public static ReturnLinkMode returnLinkMode() {
         return RETURN_LINK_MODE.get();
     }
+
+    public static int symbolInkCost() {
+        return SYMBOL_INK_COST.get();
+    }
+
+    public static int linkPanelInkCost() {
+        return LINK_PANEL_INK_COST.get();
+    }
 }

src/main/java/net/dnorberg/rivencraft/gametest/WritingDataGameTests.java

@@ -9,14 +9,22 @@ import net.dnorberg.rivencraft.writing.PageContent;
 import net.dnorberg.rivencraft.writing.SymbolCatalog;
 import net.dnorberg.rivencraft.writing.SymbolReference;
 import net.dnorberg.rivencraft.writing.WritingEntry;
+import net.dnorberg.rivencraft.writing.NotebookContents;
 import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.item.InkVialItem;
+import net.dnorberg.rivencraft.writing.WritingInkService;
 import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.menu.NotebookMenu;
 import net.minecraft.gametest.framework.GameTest;
 import net.minecraft.gametest.framework.GameTestHelper;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.Items;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.inventory.ClickType;
 import net.neoforged.neoforge.gametest.GameTestHolder;
 import net.neoforged.neoforge.gametest.PrefixGameTestTemplate;
 
@@ -118,6 +126,195 @@ public final class WritingDataGameTests {
         }
     }
 
+    @GameTest(template = "empty")
+    public static void notebookContentsPreserveOrderGapsNamesAndUnknownPages(GameTestHelper helper) {
+        ItemStack first = PageItem.createSymbolPage(reference("rivencraft:terrain/standard"));
+        first.set(net.minecraft.core.component.DataComponents.CUSTOM_NAME,
+                net.minecraft.network.chat.Component.literal("Foundation"));
+        ItemStack unknown = PageItem.createRecoveredPage(reference("example:removed_symbol"));
+        NotebookContents contents = new NotebookContents(List.of(first, ItemStack.EMPTY, unknown));
+        ItemStack notebook = new ItemStack(ModItems.NOTEBOOK.get());
+        notebook.set(ModDataComponents.NOTEBOOK_CONTENTS.get(), contents);
+
+        CompoundTag serialized = (CompoundTag)notebook.saveOptional(helper.getLevel().registryAccess());
+        ItemStack restored = ItemStack.parseOptional(helper.getLevel().registryAccess(), serialized);
+        NotebookContents restoredContents = restored.get(ModDataComponents.NOTEBOOK_CONTENTS.get());
+        helper.assertTrue(restoredContents != null, "Notebook contents must survive ItemStack persistence");
+        helper.assertValueEqual(restoredContents.pages().size(), 3,
+                "Notebook persistence must retain ordered positions");
+        helper.assertTrue(restoredContents.pages().get(1).isEmpty(),
+                "Notebook persistence must retain empty positions between pages");
+        helper.assertValueEqual(restoredContents.pages().get(0).getHoverName().getString(), "Foundation",
+                "Renamed contained pages must retain their names");
+        helper.assertValueEqual(PageItem.content(restoredContents.pages().get(2)).kind(),
+                PageContent.Kind.UNRESOLVED_SYMBOL,
+                "Unknown symbol pages must remain present and removable");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void notebookMenuValidatesInsertionAndPersistsReorder(GameTestHelper helper) {
+        var player = helper.makeMockServerPlayerInLevel();
+        ItemStack notebook = new ItemStack(ModItems.NOTEBOOK.get());
+        player.setItemInHand(InteractionHand.MAIN_HAND, notebook);
+        NotebookMenu menu = new NotebookMenu(7, player.getInventory(), InteractionHand.MAIN_HAND);
+        ItemStack first = PageItem.createSymbolPage(reference("rivencraft:terrain/standard"));
+        first.set(net.minecraft.core.component.DataComponents.CUSTOM_NAME,
+                net.minecraft.network.chat.Component.literal("Terrain Base"));
+        ItemStack second = PageItem.createRecoveredPage(reference("example:removed_symbol"));
+
+        helper.assertFalse(menu.getSlot(0).mayPlace(new ItemStack(Items.DIRT)),
+                "Notebook slots must reject non-Page items");
+        menu.getSlot(0).set(first);
+        menu.getSlot(1).set(second);
+        helper.assertTrue(menu.clickMenuButton(player, NotebookMenu.MOVE_NEXT_BASE),
+                "The server menu must accept a valid adjacent reorder");
+
+        NotebookContents saved = notebook.get(ModDataComponents.NOTEBOOK_CONTENTS.get());
+        helper.assertTrue(saved != null, "Menu changes must persist immediately to the Notebook item");
+        helper.assertValueEqual(saved.pages().get(1).getHoverName().getString(), "Terrain Base",
+                "Reordering must preserve existing Page item data");
+        helper.assertValueEqual(PageItem.content(saved.pages().get(0)).kind(),
+                PageContent.Kind.UNRESOLVED_SYMBOL,
+                "Reordering must preserve unresolved pages");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void notebookMenuSurvivesInventoryStackReplacementAndClicks(GameTestHelper helper) {
+        var player = helper.makeMockServerPlayerInLevel();
+        player.setItemInHand(InteractionHand.MAIN_HAND, new ItemStack(ModItems.NOTEBOOK.get()));
+        NotebookMenu menu = new NotebookMenu(8, player.getInventory(), InteractionHand.MAIN_HAND);
+
+        // Slot synchronization may replace the ItemStack object while the Notebook remains held.
+        player.setItemInHand(InteractionHand.MAIN_HAND, player.getMainHandItem().copy());
+        helper.assertTrue(menu.stillValid(player),
+                "Replacing the held stack object must not close an open Notebook menu");
+        menu.getSlot(0).set(PageItem.createSymbolPage(reference("rivencraft:terrain/standard")));
+        helper.assertTrue(player.getMainHandItem().has(ModDataComponents.NOTEBOOK_CONTENTS.get()),
+                "Page edits must persist to the current held Notebook stack");
+
+        player.getInventory().setItem(9, new ItemStack(Items.DIRT));
+        menu.clicked(NotebookMenu.NOTEBOOK_SLOTS, 0, ClickType.PICKUP, player);
+        helper.assertTrue(menu.getCarried().is(Items.DIRT),
+                "Clicking a player inventory item must pick it up without closing the Notebook");
+        helper.assertTrue(menu.stillValid(player),
+                "Normal inventory clicks must leave the Notebook menu valid");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void notebookMenuPreservesSparsePagePositions(GameTestHelper helper) {
+        var player = helper.makeMockServerPlayerInLevel();
+        player.setItemInHand(InteractionHand.MAIN_HAND, new ItemStack(ModItems.NOTEBOOK.get()));
+        NotebookMenu menu = new NotebookMenu(9, player.getInventory(), InteractionHand.MAIN_HAND);
+        ItemStack page = PageItem.createSymbolPage(reference("rivencraft:terrain/standard"));
+        menu.setCarried(page);
+
+        menu.clicked(9, 0, ClickType.PICKUP, player);
+        helper.assertTrue(menu.getCarried().isEmpty(),
+                "Clicking a distant empty Notebook slot must place the carried Page");
+        NotebookContents saved = player.getMainHandItem().get(ModDataComponents.NOTEBOOK_CONTENTS.get());
+        helper.assertTrue(saved != null && saved.pages().size() > 9,
+                "Notebook persistence must extend through the highest occupied position");
+        for (int index = 0; index < 9; index++) {
+            helper.assertTrue(saved.pages().get(index).isEmpty(),
+                    "Earlier empty page positions must remain empty rather than being packed together");
+        }
+        helper.assertValueEqual(PageItem.content(saved.pages().get(9)).kind(), PageContent.Kind.SYMBOL,
+                "The Page must remain in the selected distant position");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void inkVialsPersistAndOnlyStackWithMatchingContents(GameTestHelper helper) {
+        ItemStack vial = new ItemStack(ModItems.INK_VIAL.get());
+        vial.set(ModDataComponents.INK_REMAINING.get(), 7);
+        CompoundTag serialized = (CompoundTag) vial.saveOptional(helper.getLevel().registryAccess());
+        ItemStack restored = ItemStack.parseOptional(helper.getLevel().registryAccess(), serialized);
+        helper.assertValueEqual(InkVialItem.remaining(restored), 7,
+                "Remaining ink must survive ItemStack persistence");
+        helper.assertTrue(ItemStack.isSameItemSameComponents(vial, restored),
+                "Vials with equal ink contents must be eligible to stack");
+        helper.assertFalse(ItemStack.isSameItemSameComponents(vial, new ItemStack(ModItems.INK_VIAL.get())),
+                "Vials with different ink contents must not stack");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void linkPanelPreparationConsumesOnePageAndConfiguredInkOnlyOnSuccess(GameTestHelper helper) {
+        var player = helper.makeMockServerPlayerInLevel();
+        ItemStack pages = new ItemStack(ModItems.PAGE.get(), 2);
+        ItemStack vial = new ItemStack(ModItems.INK_VIAL.get());
+        player.setItemInHand(InteractionHand.MAIN_HAND, vial);
+        player.setItemInHand(InteractionHand.OFF_HAND, pages);
+
+        helper.assertTrue(WritingInkService.prepareLinkPanel(player, InteractionHand.MAIN_HAND),
+                "A blank Page and sufficient ink must prepare one link panel");
+        helper.assertValueEqual(pages.getCount(), 1, "Preparation must consume exactly one blank Page");
+        helper.assertValueEqual(InkVialItem.remaining(player.getMainHandItem()),
+                InkVialItem.CAPACITY - WritingInkService.linkPanelCost(),
+                "Preparation must consume exactly the server-configured ink cost");
+        long panels = player.getInventory().items.stream()
+                .filter(stack -> stack.is(ModItems.PAGE.get())
+                        && PageItem.content(stack).kind() == PageContent.Kind.LINK_PANEL)
+                .mapToInt(ItemStack::getCount).sum();
+        helper.assertValueEqual(panels, 1L, "Preparation must output exactly one link panel");
+
+        ItemStack written = PageItem.createSymbolPage(reference("rivencraft:terrain/standard"));
+        player.setItemInHand(InteractionHand.OFF_HAND, written);
+        int inkBefore = InkVialItem.remaining(player.getMainHandItem());
+        helper.assertFalse(WritingInkService.prepareLinkPanel(player, InteractionHand.MAIN_HAND),
+                "A written Page must not be overwritten as a link panel");
+        helper.assertValueEqual(InkVialItem.remaining(player.getMainHandItem()), inkBefore,
+                "Rejected writing must not consume ink");
+        helper.assertValueEqual(PageItem.content(written).kind(), PageContent.Kind.SYMBOL,
+                "Rejected writing must not modify the input Page");
+
+        ItemStack lowInk = new ItemStack(ModItems.INK_VIAL.get());
+        lowInk.set(ModDataComponents.INK_REMAINING.get(), WritingInkService.linkPanelCost() - 1);
+        player.setItemInHand(InteractionHand.MAIN_HAND, lowInk);
+        player.setItemInHand(InteractionHand.OFF_HAND, new ItemStack(ModItems.PAGE.get()));
+        helper.assertFalse(WritingInkService.prepareLinkPanel(player, InteractionHand.MAIN_HAND),
+                "Insufficient ink must reject link-panel preparation");
+        helper.assertValueEqual(InkVialItem.remaining(player.getMainHandItem()),
+                WritingInkService.linkPanelCost() - 1,
+                "Insufficient ink must remain untouched");
+        helper.assertValueEqual(PageItem.content(player.getOffhandItem()).kind(), PageContent.Kind.BLANK,
+                "Insufficient ink must leave the Page blank");
+
+        lowInk.set(ModDataComponents.INK_REMAINING.get(), WritingInkService.linkPanelCost());
+        helper.assertTrue(WritingInkService.prepareLinkPanel(player, InteractionHand.MAIN_HAND),
+                "Exact remaining ink must be usable");
+        helper.assertTrue(player.getMainHandItem().is(Items.GLASS_BOTTLE),
+                "A depleted Ink Vial must return a reusable glass bottle");
+        helper.assertValueEqual(PageItem.content(player.getOffhandItem()).kind(),
+                PageContent.Kind.LINK_PANEL,
+                "A single blank Page must be replaced by one Link Panel Page");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void stackedInkVialsSplitWithoutChangingTheOtherVials(GameTestHelper helper) {
+        var player = helper.makeMockServerPlayerInLevel();
+        player.setItemInHand(InteractionHand.MAIN_HAND, new ItemStack(ModItems.INK_VIAL.get(), 2));
+        player.setItemInHand(InteractionHand.OFF_HAND, new ItemStack(ModItems.PAGE.get()));
+
+        helper.assertTrue(WritingInkService.prepareLinkPanel(player, InteractionHand.MAIN_HAND),
+                "A stack of full vials must support preparing one panel");
+        helper.assertValueEqual(player.getMainHandItem().getCount(), 1,
+                "Using one vial must leave the other full vial in hand");
+        helper.assertValueEqual(InkVialItem.remaining(player.getMainHandItem()), InkVialItem.CAPACITY,
+                "The unconsumed vial must remain full");
+        long partialVials = player.getInventory().items.stream()
+                .filter(stack -> stack.is(ModItems.INK_VIAL.get())
+                        && InkVialItem.remaining(stack) == InkVialItem.CAPACITY - WritingInkService.linkPanelCost())
+                .mapToInt(ItemStack::getCount).sum();
+        helper.assertValueEqual(partialVials, 1L,
+                "The used vial must reappear with only its own ink reduced");
+        helper.succeed();
+    }
+
     private static SymbolReference reference(String id) {
         return new SymbolReference(ResourceLocation.parse(id));
     }

src/main/java/net/dnorberg/rivencraft/gametest/WritingDeskGameTests.java

@@ -0,0 +1,209 @@
+package net.dnorberg.rivencraft.gametest;
+
+import java.util.List;
+import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.block.entity.WritingDeskBlockEntity;
+import net.dnorberg.rivencraft.menu.WritingDeskMenu;
+import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.registry.ModBlocks;
+import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.writing.NotebookContents;
+import net.minecraft.core.BlockPos;
+import net.minecraft.gametest.framework.GameTest;
+import net.minecraft.gametest.framework.GameTestHelper;
+import net.minecraft.world.entity.item.ItemEntity;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.Items;
+import net.minecraft.world.inventory.ClickType;
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.phys.AABB;
+import net.neoforged.neoforge.gametest.GameTestHolder;
+import net.neoforged.neoforge.gametest.PrefixGameTestTemplate;
+
+@GameTestHolder(Rivencraft.MOD_ID)
+@PrefixGameTestTemplate(false)
+public final class WritingDeskGameTests {
+    private WritingDeskGameTests() {}
+
+    @GameTest(template = "empty")
+    public static void inventoryAndActiveCollectionPersist(GameTestHelper helper) {
+        BlockPos pos = helper.absolutePos(new BlockPos(1, 1, 1));
+        var original = new WritingDeskBlockEntity(pos, ModBlocks.WRITING_DESK.get().defaultBlockState());
+        original.setItem(0, new ItemStack(ModItems.NOTEBOOK.get()));
+        original.setItem(WritingDeskBlockEntity.INK, new ItemStack(ModItems.INK_VIAL.get()));
+        original.setItem(WritingDeskBlockEntity.PAPER, new ItemStack(ModItems.PAGE.get(), 12));
+        original.setActiveCollection(2);
+        var saved = original.saveWithoutMetadata(helper.getLevel().registryAccess());
+        var restored = new WritingDeskBlockEntity(pos, ModBlocks.WRITING_DESK.get().defaultBlockState());
+        restored.loadWithComponents(saved, helper.getLevel().registryAccess());
+        helper.assertTrue(restored.getItem(0).is(ModItems.NOTEBOOK.get()), "Notebook lost on save/load");
+        helper.assertTrue(restored.getItem(WritingDeskBlockEntity.INK).is(ModItems.INK_VIAL.get()), "Ink lost on save/load");
+        helper.assertValueEqual(restored.getItem(WritingDeskBlockEntity.PAPER).getCount(), 12, "Pages lost on save/load");
+        helper.assertValueEqual(restored.activeCollection(), 2, "Active collection lost on save/load");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void breakingDeskDropsItsStoredItemsOnce(GameTestHelper helper) {
+        BlockPos relative = new BlockPos(1, 1, 1);
+        BlockPos pos = helper.absolutePos(relative);
+        helper.getLevel().setBlock(pos, ModBlocks.WRITING_DESK.get().defaultBlockState(), 3);
+        WritingDeskBlockEntity desk = (WritingDeskBlockEntity) helper.getLevel().getBlockEntity(pos);
+        desk.setItem(0, new ItemStack(ModItems.NOTEBOOK.get()));
+        desk.setItem(WritingDeskBlockEntity.INK, new ItemStack(ModItems.INK_VIAL.get()));
+        desk.setItem(WritingDeskBlockEntity.PAPER, new ItemStack(ModItems.PAGE.get(), 12));
+        helper.getLevel().setBlock(pos, Blocks.AIR.defaultBlockState(), 3);
+        var drops = helper.getLevel().getEntitiesOfClass(ItemEntity.class, new AABB(pos).inflate(2));
+        int notebooks = drops.stream().filter(e -> e.getItem().is(ModItems.NOTEBOOK.get())).mapToInt(e -> e.getItem().getCount()).sum();
+        int ink = drops.stream().filter(e -> e.getItem().is(ModItems.INK_VIAL.get())).mapToInt(e -> e.getItem().getCount()).sum();
+        int pages = drops.stream().filter(e -> e.getItem().is(ModItems.PAGE.get())).mapToInt(e -> e.getItem().getCount()).sum();
+        helper.assertValueEqual(notebooks, 1, "Notebook must drop exactly once");
+        helper.assertValueEqual(ink, 1, "Ink must drop exactly once");
+        helper.assertValueEqual(pages, 12, "Pages must drop without loss");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void menuTransfersWithoutDuplicationAndClosesWhenReplaced(GameTestHelper helper) {
+        BlockPos pos = helper.absolutePos(new BlockPos(1, 1, 1));
+        helper.getLevel().setBlock(pos, ModBlocks.WRITING_DESK.get().defaultBlockState(), 3);
+        WritingDeskBlockEntity desk = (WritingDeskBlockEntity) helper.getLevel().getBlockEntity(pos);
+        var player = helper.makeMockServerPlayerInLevel();
+        player.moveTo(pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5);
+        player.getInventory().setItem(9, new ItemStack(Items.PAPER, 12));
+        WritingDeskMenu menu = new WritingDeskMenu(1, player.getInventory(), desk);
+        helper.assertTrue(menu.stillValid(player), "Placed desk must keep its menu valid");
+        helper.assertTrue(menu.clickMenuButton(player, 3), "Active collection control must accept a valid tab");
+        helper.assertValueEqual(desk.activeCollection(), 3, "Selected tab must be stored on the desk");
+        menu.quickMoveStack(player, 9);
+        helper.assertValueEqual(desk.getItem(WritingDeskBlockEntity.PAPER).getCount(), 12, "Shift-click must deposit all pages");
+        helper.assertTrue(player.getInventory().getItem(9).isEmpty(), "Shift-click must consume player source stack");
+        menu.quickMoveStack(player, WritingDeskBlockEntity.PAPER);
+        helper.assertTrue(desk.getItem(WritingDeskBlockEntity.PAPER).isEmpty(), "Shift-click must empty desk source slot");
+        int total = player.getInventory().items.stream().filter(stack -> stack.is(Items.PAPER))
+                .mapToInt(ItemStack::getCount).sum();
+        helper.assertValueEqual(total, 12, "Round-trip must not lose or duplicate pages");
+        helper.getLevel().setBlock(pos, Blocks.AIR.defaultBlockState(), 3);
+        helper.assertFalse(menu.stillValid(player), "Removed desk must invalidate menu");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void takingCopySpendsPaperAndOneInkThenReturnsGlassBottle(GameTestHelper helper) {
+        BlockPos pos = helper.absolutePos(new BlockPos(1, 1, 1));
+        helper.getLevel().setBlock(pos, ModBlocks.WRITING_DESK.get().defaultBlockState(), 3);
+        WritingDeskBlockEntity desk = (WritingDeskBlockEntity) helper.getLevel().getBlockEntity(pos);
+        ItemStack source = PageItem.createLinkPanelPage();
+        desk.setItem(0, source.copy());
+        desk.setItem(WritingDeskBlockEntity.PAPER, new ItemStack(Items.PAPER, 2));
+        desk.setItem(WritingDeskBlockEntity.INK, new ItemStack(ModItems.INK_VIAL.get()));
+        var player = helper.makeMockServerPlayerInLevel();
+        player.moveTo(pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5);
+        WritingDeskMenu menu = new WritingDeskMenu(1, player.getInventory(), desk);
+        menu.broadcastChanges();
+        helper.assertTrue(menu.getSlot(WritingDeskMenu.COPY_RESULT).getItem().is(ModItems.PAGE.get()),
+                "A source page with paper and ink must preview one copy");
+        helper.assertValueEqual(desk.getItem(WritingDeskBlockEntity.PAPER).getCount(), 2,
+                "Previewing must not consume paper");
+        helper.assertValueEqual(desk.inkRemaining(), 0, "Previewing must not consume ink");
+        menu.clicked(WritingDeskMenu.COPY_RESULT, 0, ClickType.PICKUP, player);
+        helper.assertTrue(menu.getCarried().is(ModItems.PAGE.get()), "Taking result must give the copied page");
+        helper.assertValueEqual(desk.getItem(WritingDeskBlockEntity.PAPER).getCount(), 1,
+                "Taking a copy must consume one paper");
+        helper.assertValueEqual(desk.inkRemaining(), 15, "First copy must refill to 16 and consume one ink");
+        helper.assertTrue(desk.getItem(WritingDeskBlockEntity.INK).isEmpty(), "Refill must consume one vial");
+        helper.assertTrue(desk.getItem(WritingDeskBlockEntity.RETURN).is(Items.GLASS_BOTTLE),
+                "Refill must return a vanilla glass bottle");
+        helper.assertTrue(desk.getItem(0).is(ModItems.PAGE.get()), "Source page must remain untouched");
+        helper.assertTrue(menu.quickMoveStack(player, WritingDeskMenu.COPY_RESULT).is(ModItems.PAGE.get()),
+                "A second copy must remain available from the same ink fill");
+        helper.assertTrue(desk.getItem(WritingDeskBlockEntity.PAPER).isEmpty(),
+                "Two copies must consume exactly two paper");
+        helper.assertValueEqual(desk.inkRemaining(), 14, "Two copies must spend exactly two of sixteen ink");
+        helper.assertValueEqual(desk.getItem(WritingDeskBlockEntity.RETURN).getCount(), 1,
+                "A second copy must not consume another vial");
+        var saved = desk.saveWithoutMetadata(helper.getLevel().registryAccess());
+        var restored = new WritingDeskBlockEntity(pos, ModBlocks.WRITING_DESK.get().defaultBlockState());
+        restored.loadWithComponents(saved, helper.getLevel().registryAccess());
+        helper.assertValueEqual(restored.inkRemaining(), 14, "Ink meter must persist across saves");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void shiftClickCopiesOnlyWhenResourcesAndBottleSpaceExist(GameTestHelper helper) {
+        BlockPos pos = helper.absolutePos(new BlockPos(1, 1, 1));
+        helper.getLevel().setBlock(pos, ModBlocks.WRITING_DESK.get().defaultBlockState(), 3);
+        WritingDeskBlockEntity desk = (WritingDeskBlockEntity) helper.getLevel().getBlockEntity(pos);
+        desk.setItem(0, PageItem.createLinkPanelPage());
+        desk.setItem(WritingDeskBlockEntity.PAPER, new ItemStack(Items.PAPER, 2));
+        desk.setItem(WritingDeskBlockEntity.INK, new ItemStack(ModItems.INK_VIAL.get()));
+        desk.setItem(WritingDeskBlockEntity.RETURN, new ItemStack(Items.GLASS_BOTTLE, 64));
+        var player = helper.makeMockServerPlayerInLevel();
+        player.moveTo(pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5);
+        WritingDeskMenu menu = new WritingDeskMenu(1, player.getInventory(), desk);
+        helper.assertTrue(menu.quickMoveStack(player, WritingDeskMenu.COPY_RESULT).isEmpty(),
+                "Full bottle return must block refill without consuming supplies");
+        helper.assertValueEqual(desk.getItem(WritingDeskBlockEntity.PAPER).getCount(), 2,
+                "Blocked copy must leave paper untouched");
+        desk.removeItem(WritingDeskBlockEntity.RETURN, 1);
+        ItemStack copied = menu.quickMoveStack(player, WritingDeskMenu.COPY_RESULT);
+        helper.assertTrue(copied.is(ModItems.PAGE.get()), "Shift-click must transfer one copy");
+        helper.assertValueEqual(desk.getItem(WritingDeskBlockEntity.PAPER).getCount(), 1,
+                "Shift-click must consume one paper");
+        helper.assertValueEqual(desk.inkRemaining(), 15, "Shift-click must consume one ink");
+        int copies = player.getInventory().items.stream().filter(stack -> stack.is(ModItems.PAGE.get()))
+                .mapToInt(ItemStack::getCount).sum();
+        helper.assertValueEqual(copies, 1, "Shift-click must give exactly one page");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void selectedNotebookPageControlsCopyPreview(GameTestHelper helper) {
+        BlockPos pos = helper.absolutePos(new BlockPos(1, 1, 1));
+        helper.getLevel().setBlock(pos, ModBlocks.WRITING_DESK.get().defaultBlockState(), 3);
+        WritingDeskBlockEntity desk = (WritingDeskBlockEntity) helper.getLevel().getBlockEntity(pos);
+        ItemStack notebook = new ItemStack(ModItems.NOTEBOOK.get());
+        notebook.set(ModDataComponents.NOTEBOOK_CONTENTS.get(),
+                new NotebookContents(List.of(ItemStack.EMPTY, PageItem.createLinkPanelPage())));
+        desk.setItem(0, notebook);
+        desk.setItem(WritingDeskBlockEntity.PAPER, new ItemStack(Items.PAPER));
+        desk.setItem(WritingDeskBlockEntity.INK, new ItemStack(ModItems.INK_VIAL.get()));
+        var player = helper.makeMockServerPlayerInLevel();
+        player.moveTo(pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5);
+        WritingDeskMenu menu = new WritingDeskMenu(1, player.getInventory(), desk);
+        menu.broadcastChanges();
+        helper.assertTrue(menu.getSlot(WritingDeskMenu.COPY_RESULT).getItem().isEmpty(),
+                "An empty selected position must not create a copy");
+        helper.assertTrue(menu.clickMenuButton(player, 17), "Second page selection must be accepted");
+        menu.broadcastChanges();
+        helper.assertTrue(menu.getSlot(WritingDeskMenu.COPY_RESULT).getItem().is(ModItems.PAGE.get()),
+                "Selecting the populated page must show a copy");
+        helper.succeed();
+    }
+
+    @GameTest(template = "empty")
+    public static void twoViewersCannotTakeTheSameLastSheet(GameTestHelper helper) {
+        BlockPos pos = helper.absolutePos(new BlockPos(1, 1, 1));
+        helper.getLevel().setBlock(pos, ModBlocks.WRITING_DESK.get().defaultBlockState(), 3);
+        WritingDeskBlockEntity desk = (WritingDeskBlockEntity) helper.getLevel().getBlockEntity(pos);
+        desk.setItem(0, PageItem.createLinkPanelPage());
+        desk.setItem(WritingDeskBlockEntity.PAPER, new ItemStack(Items.PAPER));
+        desk.setItem(WritingDeskBlockEntity.INK, new ItemStack(ModItems.INK_VIAL.get()));
+        var first = helper.makeMockServerPlayerInLevel();
+        var second = helper.makeMockServerPlayerInLevel();
+        first.moveTo(pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5);
+        second.moveTo(pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5);
+        WritingDeskMenu firstMenu = new WritingDeskMenu(1, first.getInventory(), desk);
+        WritingDeskMenu secondMenu = new WritingDeskMenu(2, second.getInventory(), desk);
+        firstMenu.broadcastChanges();
+        secondMenu.broadcastChanges();
+        helper.assertTrue(firstMenu.quickMoveStack(first, WritingDeskMenu.COPY_RESULT).is(ModItems.PAGE.get()),
+                "First viewer should take the last available copy");
+        helper.assertTrue(secondMenu.quickMoveStack(second, WritingDeskMenu.COPY_RESULT).isEmpty(),
+                "Second viewer must not copy the already-consumed paper");
+        helper.assertTrue(desk.getItem(WritingDeskBlockEntity.PAPER).isEmpty(),
+                "Shared desk must spend paper only once");
+        helper.succeed();
+    }
+}

src/main/java/net/dnorberg/rivencraft/item/InkVialItem.java

@@ -0,0 +1,47 @@
+package net.dnorberg.rivencraft.item;
+
+import java.util.List;
+import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.writing.WritingInkService;
+import net.minecraft.ChatFormatting;
+import net.minecraft.network.chat.Component;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.InteractionResultHolder;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.TooltipFlag;
+import net.minecraft.world.level.Level;
+
+/** A stackable vial; the ink component is per vial, not shared across a stack. */
+public final class InkVialItem extends Item {
+    public static final int CAPACITY = 16;
+
+    public InkVialItem(Properties properties) {
+        super(properties);
+    }
+
+    public static int remaining(ItemStack vial) {
+        return vial.getOrDefault(ModDataComponents.INK_REMAINING.get(), CAPACITY);
+    }
+
+    @Override
+    public InteractionResultHolder<ItemStack> use(Level level, Player player, InteractionHand hand) {
+        if (!WritingInkService.canPrepareLinkPanel(player, hand)) {
+            return InteractionResultHolder.pass(player.getItemInHand(hand));
+        }
+        if (!level.isClientSide) {
+            WritingInkService.prepareLinkPanel(player, hand);
+        }
+        return InteractionResultHolder.sidedSuccess(player.getItemInHand(hand), level.isClientSide);
+    }
+
+    @Override
+    public void appendHoverText(ItemStack stack, TooltipContext context,
+                                List<Component> tooltip, TooltipFlag flag) {
+        tooltip.add(Component.translatable("item.rivencraft.ink_vial.remaining",
+                remaining(stack), CAPACITY).withStyle(ChatFormatting.GRAY));
+        tooltip.add(Component.translatable("item.rivencraft.ink_vial.usage")
+                .withStyle(ChatFormatting.GRAY));
+    }
+}

src/main/java/net/dnorberg/rivencraft/item/NotebookItem.java

@@ -0,0 +1,48 @@
+package net.dnorberg.rivencraft.item;
+
+import java.util.List;
+import net.dnorberg.rivencraft.menu.NotebookMenu;
+import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.writing.NotebookContents;
+import net.minecraft.ChatFormatting;
+import net.minecraft.network.chat.Component;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.InteractionResultHolder;
+import net.minecraft.world.SimpleMenuProvider;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.TooltipFlag;
+import net.minecraft.world.level.Level;
+
+public final class NotebookItem extends Item {
+    public NotebookItem(Properties properties) {
+        super(properties);
+    }
+
+    @Override
+    public InteractionResultHolder<ItemStack> use(Level level, Player player, InteractionHand hand) {
+        ItemStack notebook = player.getItemInHand(hand);
+        if (!level.isClientSide && player instanceof ServerPlayer serverPlayer) {
+            serverPlayer.openMenu(new SimpleMenuProvider(
+                    (containerId, inventory, ignored) -> new NotebookMenu(containerId, inventory, hand),
+                    notebook.getHoverName()),
+                    buffer -> buffer.writeBoolean(hand == InteractionHand.OFF_HAND));
+        }
+        return InteractionResultHolder.sidedSuccess(notebook, level.isClientSide);
+    }
+
+    @Override
+    public void appendHoverText(ItemStack stack, TooltipContext context,
+                                List<Component> tooltip, TooltipFlag flag) {
+        NotebookContents contents = stack.getOrDefault(
+                ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY);
+        tooltip.add(Component.translatable("item.rivencraft.notebook.pages",
+                contents.pageCount(), NotebookContents.MAX_PAGES).withStyle(ChatFormatting.GRAY));
+        if (contents.unresolvedCount() > 0) {
+            tooltip.add(Component.translatable("item.rivencraft.notebook.unresolved",
+                    contents.unresolvedCount()).withStyle(ChatFormatting.RED));
+        }
+    }
+}

src/main/java/net/dnorberg/rivencraft/item/PageItem.java

@@ -55,6 +55,10 @@ public final class PageItem extends Item {
 
     @Override
     public Component getName(ItemStack stack) {
+        Component customName = stack.get(DataComponents.CUSTOM_NAME);
+        if (customName != null) {
+            return customName;
+        }
         PageContent content = content(stack);
         return switch (content.kind()) {
             case BLANK -> Component.translatable("item.rivencraft.page.blank");

src/main/java/net/dnorberg/rivencraft/menu/NotebookMenu.java

@@ -0,0 +1,194 @@
+package net.dnorberg.rivencraft.menu;
+
+import java.util.List;
+import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.registry.ModMenus;
+import net.dnorberg.rivencraft.writing.NotebookContents;
+import net.minecraft.core.NonNullList;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.world.Container;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.SimpleContainer;
+import net.minecraft.world.entity.player.Inventory;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.inventory.AbstractContainerMenu;
+import net.minecraft.world.inventory.ClickType;
+import net.minecraft.world.inventory.Slot;
+import net.minecraft.world.item.ItemStack;
+
+public final class NotebookMenu extends AbstractContainerMenu {
+    public static final int NOTEBOOK_SLOTS = NotebookContents.MAX_PAGES;
+    public static final int MOVE_PREVIOUS_BASE = 0;
+    public static final int MOVE_NEXT_BASE = NOTEBOOK_SLOTS;
+    private static final int PLAYER_INVENTORY_START = NOTEBOOK_SLOTS;
+    private final Inventory playerInventory;
+    private final InteractionHand hand;
+    private final int openedHotbarSlot;
+    private final NotebookContainer contents;
+
+    public NotebookMenu(int containerId, Inventory inventory, RegistryFriendlyByteBuf data) {
+        this(containerId, inventory, data.readBoolean() ? InteractionHand.OFF_HAND : InteractionHand.MAIN_HAND);
+    }
+
+    public NotebookMenu(int containerId, Inventory inventory, InteractionHand hand) {
+        super(ModMenus.NOTEBOOK.get(), containerId);
+        this.playerInventory = inventory;
+        this.hand = hand;
+        this.openedHotbarSlot = inventory.selected;
+        this.contents = new NotebookContainer(inventory, hand);
+
+        for (int row = 0; row < 3; row++) {
+            for (int column = 0; column < 9; column++) {
+                // The client draws these pages on a filtered, scrollable surface instead.
+                addSlot(new PageSlot(contents, column + row * 9, -1000, -1000));
+            }
+        }
+        for (int row = 0; row < 3; row++) {
+            for (int column = 0; column < 9; column++) {
+                int inventoryIndex = column + row * 9 + 9;
+                addSlot(playerSlot(inventoryIndex, 8 + column * 18, 135 + row * 18));
+            }
+        }
+        for (int column = 0; column < 9; column++) {
+            addSlot(playerSlot(column, 8 + column * 18, 193));
+        }
+    }
+
+    private Slot playerSlot(int inventoryIndex, int x, int y) {
+        boolean locked = hand == InteractionHand.MAIN_HAND && inventoryIndex == openedHotbarSlot;
+        return locked ? new LockedSlot(playerInventory, inventoryIndex, x, y)
+                : new Slot(playerInventory, inventoryIndex, x, y);
+    }
+
+    @Override
+    public boolean stillValid(Player player) {
+        return player.isAlive()
+                && (hand == InteractionHand.OFF_HAND || player.getInventory().selected == openedHotbarSlot)
+                && player.getItemInHand(hand).is(ModItems.NOTEBOOK.get());
+    }
+
+    @Override
+    public ItemStack quickMoveStack(Player player, int index) {
+        Slot slot = slots.get(index);
+        if (!slot.hasItem()) {
+            return ItemStack.EMPTY;
+        }
+        ItemStack source = slot.getItem();
+        ItemStack original = source.copy();
+        if (index < PLAYER_INVENTORY_START) {
+            if (!moveItemStackTo(source, PLAYER_INVENTORY_START, slots.size(), true)) {
+                return ItemStack.EMPTY;
+            }
+        } else {
+            if (!source.is(ModItems.PAGE.get())
+                    || !moveItemStackTo(source, 0, PLAYER_INVENTORY_START, false)) {
+                return ItemStack.EMPTY;
+            }
+        }
+        if (source.isEmpty()) {
+            slot.setByPlayer(ItemStack.EMPTY);
+        } else {
+            slot.setChanged();
+        }
+        return original;
+    }
+
+    @Override
+    public boolean clickMenuButton(Player player, int id) {
+        int source;
+        int target;
+        if (id >= MOVE_PREVIOUS_BASE && id < MOVE_NEXT_BASE) {
+            source = id;
+            target = source - 1;
+        } else if (id >= MOVE_NEXT_BASE && id < MOVE_NEXT_BASE + NOTEBOOK_SLOTS) {
+            source = id - MOVE_NEXT_BASE;
+            target = source + 1;
+        } else {
+            return false;
+        }
+        if (source < 0 || source >= NOTEBOOK_SLOTS || target < 0 || target >= NOTEBOOK_SLOTS
+                || contents.getItem(source).isEmpty()) {
+            return false;
+        }
+        contents.swap(source, target);
+        broadcastChanges();
+        return true;
+    }
+
+    @Override
+    public void clicked(int slotId, int button, ClickType clickType, Player player) {
+        if (!stillValid(player)) {
+            player.closeContainer();
+            return;
+        }
+        if (clickType == ClickType.SWAP
+                && (button == openedHotbarSlot && hand == InteractionHand.MAIN_HAND
+                        || button == 40 && hand == InteractionHand.OFF_HAND)) {
+            return;
+        }
+        super.clicked(slotId, button, clickType, player);
+    }
+
+    private static final class PageSlot extends Slot {
+        private PageSlot(Container container, int slot, int x, int y) {
+            super(container, slot, x, y);
+        }
+
+        @Override public boolean mayPlace(ItemStack stack) { return stack.is(ModItems.PAGE.get()); }
+        @Override public int getMaxStackSize() { return 1; }
+    }
+
+    private static final class LockedSlot extends Slot {
+        private LockedSlot(Container container, int slot, int x, int y) {
+            super(container, slot, x, y);
+        }
+
+        @Override public boolean mayPickup(Player player) { return false; }
+        @Override public boolean mayPlace(ItemStack stack) { return false; }
+    }
+
+    private static final class NotebookContainer extends SimpleContainer {
+        private final Inventory inventory;
+        private final InteractionHand hand;
+        private boolean loading;
+
+        private NotebookContainer(Inventory inventory, InteractionHand hand) {
+            super(NOTEBOOK_SLOTS);
+            this.inventory = inventory;
+            this.hand = hand;
+            ItemStack notebook = inventory.player.getItemInHand(hand);
+            loading = true;
+            List<ItemStack> saved = notebook.getOrDefault(
+                    ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages();
+            for (int index = 0; index < saved.size(); index++) {
+                super.setItem(index, saved.get(index).copy());
+            }
+            loading = false;
+        }
+
+        private void swap(int first, int second) {
+            loading = true;
+            ItemStack held = getItem(first);
+            setItem(first, getItem(second));
+            setItem(second, held);
+            loading = false;
+            setChanged();
+        }
+
+        @Override
+        public void setChanged() {
+            super.setChanged();
+            ItemStack notebook = inventory.player.getItemInHand(hand);
+            if (loading || !notebook.is(ModItems.NOTEBOOK.get())) {
+                return;
+            }
+            NonNullList<ItemStack> saved = NonNullList.withSize(NOTEBOOK_SLOTS, ItemStack.EMPTY);
+            for (int index = 0; index < NOTEBOOK_SLOTS; index++) {
+                ItemStack page = getItem(index);
+                saved.set(index, page.isEmpty() ? ItemStack.EMPTY : page.copyWithCount(1));
+            }
+            notebook.set(ModDataComponents.NOTEBOOK_CONTENTS.get(), new NotebookContents(saved));
+        }
+    }
+}

src/main/java/net/dnorberg/rivencraft/menu/WritingDeskMenu.java

@@ -0,0 +1,189 @@
+package net.dnorberg.rivencraft.menu;
+
+import net.dnorberg.rivencraft.block.entity.WritingDeskBlockEntity;
+import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.dnorberg.rivencraft.registry.ModMenus;
+import net.dnorberg.rivencraft.writing.NotebookContents;
+import net.dnorberg.rivencraft.writing.PageContent;
+import java.util.List;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.world.Container;
+import net.minecraft.world.SimpleContainer;
+import net.minecraft.world.entity.player.Inventory;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.inventory.AbstractContainerMenu;
+import net.minecraft.world.inventory.DataSlot;
+import net.minecraft.world.inventory.Slot;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.Items;
+
+public final class WritingDeskMenu extends AbstractContainerMenu {
+    public static final int COPY_RESULT = WritingDeskBlockEntity.SIZE;
+    private static final int PLAYER_START = COPY_RESULT + 1;
+    private final Container desk;
+    private final WritingDeskBlockEntity blockEntity;
+    private final SimpleContainer result = new SimpleContainer(1);
+    private final boolean clientSide;
+    private int syncedActiveCollection;
+    private int syncedInkRemaining;
+    private int selectedPage;
+
+    public WritingDeskMenu(int id, Inventory inventory, RegistryFriendlyByteBuf data) {
+        this(id, inventory, inventory.player.level().getBlockEntity(data.readBlockPos())
+                instanceof WritingDeskBlockEntity found ? found : null);
+    }
+
+    public WritingDeskMenu(int id, Inventory inventory, WritingDeskBlockEntity blockEntity) {
+        super(ModMenus.WRITING_DESK.get(), id);
+        this.blockEntity = blockEntity;
+        this.desk = blockEntity == null ? new SimpleContainer(WritingDeskBlockEntity.SIZE) : blockEntity;
+        this.clientSide = inventory.player.level().isClientSide;
+        addDataSlot(new DataSlot() {
+            @Override public int get() { return WritingDeskMenu.this.blockEntity == null
+                    ? syncedActiveCollection : WritingDeskMenu.this.blockEntity.activeCollection(); }
+            @Override public void set(int value) { syncedActiveCollection = value; }
+        });
+        addDataSlot(new DataSlot() {
+            @Override public int get() { return WritingDeskMenu.this.blockEntity == null
+                    ? syncedInkRemaining : WritingDeskMenu.this.blockEntity.inkRemaining(); }
+            @Override public void set(int value) { syncedInkRemaining = value; }
+        });
+        for (int i = 0; i < WritingDeskBlockEntity.COLLECTIONS; i++) {
+            addSlot(new DeskSlot(desk, i, 12, 20 + i * 37, 1));
+        }
+        addSlot(new DeskSlot(desk, WritingDeskBlockEntity.INK, 370, 20, 16));
+        addSlot(new DeskSlot(desk, WritingDeskBlockEntity.RETURN, 370, 57, 64));
+        addSlot(new DeskSlot(desk, WritingDeskBlockEntity.PAPER, 228, 20, 64));
+        addSlot(new DeskSlot(desk, WritingDeskBlockEntity.LEGACY_OUTPUT, -1000, -1000, 64));
+        addSlot(new CopySlot(result, 0, 228, 57));
+        for (int row = 0; row < 3; row++) {
+            for (int column = 0; column < 9; column++) {
+                addSlot(new Slot(inventory, column + row * 9 + 9, 224 + column * 18, 91 + row * 18));
+            }
+        }
+        for (int column = 0; column < 9; column++) {
+            addSlot(new Slot(inventory, column, 224 + column * 18, 149));
+        }
+    }
+
+    public int activeCollection() { return syncedActiveCollection; }
+    public int inkRemaining() { return syncedInkRemaining; }
+
+    @Override public boolean clickMenuButton(Player player, int id) {
+        if (blockEntity == null || !stillValid(player)) return false;
+        if (id >= 0 && id < WritingDeskBlockEntity.COLLECTIONS) {
+            blockEntity.setActiveCollection(id);
+            selectedPage = 0;
+        } else if (id >= 16 && id < 16 + NotebookContents.MAX_PAGES) {
+            selectedPage = id - 16;
+        } else return false;
+        refreshOutput();
+        return true;
+    }
+
+    @Override public boolean stillValid(Player player) {
+        return blockEntity != null && blockEntity.stillValid(player);
+    }
+
+    @Override public ItemStack quickMoveStack(Player player, int index) {
+        if (!stillValid(player) || index < 0 || index >= slots.size()) return ItemStack.EMPTY;
+        if (index == COPY_RESULT) {
+            refreshOutput();
+            if (!canCopy()) return ItemStack.EMPTY;
+            ItemStack copy = selectedSource().copyWithCount(1);
+            ItemStack movingCopy = copy.copy();
+            if (!moveItemStackTo(movingCopy, PLAYER_START, slots.size(), true) || !movingCopy.isEmpty()) {
+                return ItemStack.EMPTY;
+            }
+            blockEntity.consumeCopyMaterials();
+            refreshOutput();
+            return copy;
+        }
+        Slot slot = slots.get(index);
+        if (!slot.hasItem()) return ItemStack.EMPTY;
+        ItemStack moving = slot.getItem();
+        ItemStack original = moving.copy();
+        if (index < COPY_RESULT) {
+            if (!moveItemStackTo(moving, PLAYER_START, slots.size(), true)) return ItemStack.EMPTY;
+        } else if (!moveIntoDesk(moving)) {
+            return ItemStack.EMPTY;
+        }
+        if (moving.isEmpty()) slot.setByPlayer(ItemStack.EMPTY);
+        else slot.setChanged();
+        return original;
+    }
+
+    private boolean moveIntoDesk(ItemStack moving) {
+        if (moving.is(ModItems.INK_VIAL.get())) return moveItemStackTo(moving, 4, 5, false);
+        if (moving.is(ModItems.NOTEBOOK.get())) return moveItemStackTo(moving, 0, 4, false);
+        if (moving.is(Items.PAPER) || moving.is(ModItems.PAGE.get())
+                && PageItem.content(moving).kind() == PageContent.Kind.BLANK)
+            return moveItemStackTo(moving, WritingDeskBlockEntity.PAPER,
+                    WritingDeskBlockEntity.PAPER + 1, false);
+        if (moving.is(ModItems.PAGE.get())) return moveItemStackTo(moving, 0, 4, false);
+        return false;
+    }
+
+    private ItemStack selectedSource() {
+        ItemStack collection = desk.getItem(blockEntity == null ? syncedActiveCollection : blockEntity.activeCollection());
+        if (collection.is(ModItems.PAGE.get())) return selectedPage == 0 ? collection : ItemStack.EMPTY;
+        if (collection.is(ModItems.NOTEBOOK.get())) {
+            List<ItemStack> pages = collection.getOrDefault(
+                    ModDataComponents.NOTEBOOK_CONTENTS.get(), NotebookContents.EMPTY).pages();
+            return selectedPage < pages.size() ? pages.get(selectedPage) : ItemStack.EMPTY;
+        }
+        return ItemStack.EMPTY;
+    }
+
+    private boolean canCopy() {
+        ItemStack source = selectedSource();
+        return blockEntity != null && source.is(ModItems.PAGE.get())
+                && PageItem.content(source).kind() != PageContent.Kind.BLANK
+                && PageItem.isUsableWriting(source) && blockEntity.canConsumeCopyMaterials();
+    }
+
+    private void refreshOutput() {
+        if (clientSide) return;
+        ItemStack preview = canCopy() ? selectedSource().copyWithCount(1) : ItemStack.EMPTY;
+        if (!ItemStack.matches(result.getItem(0), preview)) result.setItem(0, preview);
+    }
+
+    @Override public void broadcastChanges() {
+        refreshOutput();
+        super.broadcastChanges();
+    }
+
+    @Override public void clicked(int slotId, int button, net.minecraft.world.inventory.ClickType clickType,
+                                  Player player) {
+        if (!stillValid(player)) {
+            player.closeContainer();
+            return;
+        }
+        refreshOutput();
+        super.clicked(slotId, button, clickType, player);
+    }
+
+    private final class CopySlot extends Slot {
+        private CopySlot(Container container, int index, int x, int y) { super(container, index, x, y); }
+        @Override public boolean mayPlace(ItemStack stack) { return false; }
+        @Override public boolean mayPickup(Player player) {
+            return clientSide ? hasItem() : WritingDeskMenu.this.stillValid(player) && canCopy();
+        }
+        @Override public void onTake(Player player, ItemStack stack) {
+            if (!clientSide && blockEntity.consumeCopyMaterials()) refreshOutput();
+            super.onTake(player, stack);
+        }
+    }
+
+    private static final class DeskSlot extends Slot {
+        private final int limit;
+        private DeskSlot(Container container, int index, int x, int y, int limit) {
+            super(container, index, x, y);
+            this.limit = limit;
+        }
+        @Override public boolean mayPlace(ItemStack stack) { return container.canPlaceItem(getContainerSlot(), stack); }
+        @Override public int getMaxStackSize() { return limit; }
+    }
+}

src/main/java/net/dnorberg/rivencraft/network/ModNetworking.java

@@ -48,7 +48,7 @@ public final class ModNetworking {
     }
 
     public static void register(RegisterPayloadHandlersEvent event) {
-        PayloadRegistrar registrar = event.registrar("9");
+        PayloadRegistrar registrar = event.registrar("10");
         registrar.playToServer(RequestDescriptiveBookScreenPayload.TYPE, RequestDescriptiveBookScreenPayload.STREAM_CODEC,
                 ModNetworking::requestDescriptiveBookScreen);
         registrar.playToClient(OpenDescriptiveBookScreenPayload.TYPE, OpenDescriptiveBookScreenPayload.STREAM_CODEC,

src/main/java/net/dnorberg/rivencraft/registry/ModBlockEntities.java

@@ -2,6 +2,7 @@ package net.dnorberg.rivencraft.registry;
 
 import net.dnorberg.rivencraft.Rivencraft;
 import net.dnorberg.rivencraft.block.entity.BookStandBlockEntity;
+import net.dnorberg.rivencraft.block.entity.WritingDeskBlockEntity;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.neoforged.bus.api.IEventBus;
@@ -16,6 +17,9 @@ public final class ModBlockEntities {
             BLOCK_ENTITIES.register("book_stand", () -> BlockEntityType.Builder
                     .of(BookStandBlockEntity::new, ModBlocks.BOOK_STAND.get())
                     .build(null));
+    public static final DeferredHolder<BlockEntityType<?>, BlockEntityType<WritingDeskBlockEntity>> WRITING_DESK =
+            BLOCK_ENTITIES.register("writing_desk", () -> BlockEntityType.Builder
+                    .of(WritingDeskBlockEntity::new, ModBlocks.WRITING_DESK.get()).build(null));
 
     private ModBlockEntities() {
     }

src/main/java/net/dnorberg/rivencraft/registry/ModBlocks.java

@@ -2,6 +2,7 @@ package net.dnorberg.rivencraft.registry;
 
 import net.dnorberg.rivencraft.Rivencraft;
 import net.dnorberg.rivencraft.block.BookStandBlock;
+import net.dnorberg.rivencraft.block.WritingDeskBlock;
 import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.state.BlockBehaviour;
 import net.neoforged.bus.api.IEventBus;
@@ -16,6 +17,10 @@ public final class ModBlocks {
             BookStandBlock::new,
             BlockBehaviour.Properties.ofFullCopy(Blocks.LECTERN)
     );
+    public static final DeferredBlock<WritingDeskBlock> WRITING_DESK = BLOCKS.registerBlock(
+            "writing_desk", WritingDeskBlock::new,
+            BlockBehaviour.Properties.ofFullCopy(Blocks.CRAFTING_TABLE)
+    );
 
     private ModBlocks() {
     }

src/main/java/net/dnorberg/rivencraft/registry/ModCreativeTabs.java

@@ -1,6 +1,7 @@
 package net.dnorberg.rivencraft.registry;
 
 import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.item.PageItem;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.network.chat.Component;
 import net.minecraft.world.item.CreativeModeTab;
@@ -19,7 +20,19 @@ public final class ModCreativeTabs {
                     .displayItems((parameters, output) -> {
                         output.accept(ModItems.DESCRIPTIVE_BOOK.get());
                         output.accept(ModItems.LINKING_BOOK.get());
+                        output.accept(ModItems.NOTEBOOK.get());
+                        output.accept(ModItems.INK_VIAL.get());
+                        output.accept(ModItems.WRITING_DESK.get());
+                    })
+                    .build());
+
+    public static final DeferredHolder<CreativeModeTab, CreativeModeTab> PAGES =
+            CREATIVE_TABS.register("rivencraft_pages", () -> CreativeModeTab.builder()
+                    .title(Component.translatable("itemGroup.rivencraft.pages"))
+                    .icon(PageItem::createLinkPanelPage)
+                    .displayItems((parameters, output) -> {
                         output.accept(ModItems.PAGE.get());
+                        output.accept(PageItem.createLinkPanelPage());
                     })
                     .build());
 

src/main/java/net/dnorberg/rivencraft/registry/ModDataComponents.java

@@ -4,7 +4,9 @@ import net.dnorberg.rivencraft.Rivencraft;
 import net.dnorberg.rivencraft.book.LinkTarget;
 import net.dnorberg.rivencraft.book.AgeReference;
 import net.dnorberg.rivencraft.writing.PageContent;
+import net.dnorberg.rivencraft.writing.NotebookContents;
 import net.dnorberg.rivencraft.writing.SymbolDisplayMetadata;
+import com.mojang.serialization.Codec;
 import net.minecraft.core.component.DataComponentType;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.resources.ResourceLocation;
@@ -53,6 +55,18 @@ public final class ModDataComponents {
                     .networkSynchronized(SymbolDisplayMetadata.STREAM_CODEC)
                     .cacheEncoding()
                     .build());
+    public static final DeferredHolder<DataComponentType<?>, DataComponentType<NotebookContents>> NOTEBOOK_CONTENTS =
+            DATA_COMPONENTS.register("notebook_contents", () -> DataComponentType.<NotebookContents>builder()
+                    .persistent(NotebookContents.CODEC)
+                    .networkSynchronized(NotebookContents.STREAM_CODEC)
+                    .cacheEncoding()
+                    .build());
+    public static final DeferredHolder<DataComponentType<?>, DataComponentType<Integer>> INK_REMAINING =
+            DATA_COMPONENTS.register("ink_remaining", () -> DataComponentType.<Integer>builder()
+                    .persistent(Codec.intRange(0, 16))
+                    .networkSynchronized(ByteBufCodecs.VAR_INT)
+                    .cacheEncoding()
+                    .build());
 
     private ModDataComponents() {
     }

src/main/java/net/dnorberg/rivencraft/registry/ModItems.java

@@ -4,7 +4,10 @@ import net.dnorberg.rivencraft.Rivencraft;
 import net.dnorberg.rivencraft.item.DescriptiveBookItem;
 import net.dnorberg.rivencraft.item.LinkingBookItem;
 import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.item.NotebookItem;
+import net.dnorberg.rivencraft.item.InkVialItem;
 import net.minecraft.world.item.Item;
+import net.minecraft.world.item.BlockItem;
 import net.neoforged.bus.api.IEventBus;
 import net.neoforged.neoforge.registries.DeferredItem;
 import net.neoforged.neoforge.registries.DeferredRegister;
@@ -27,6 +30,17 @@ public final class ModItems {
             PageItem::new,
             new Item.Properties().stacksTo(64)
     );
+    public static final DeferredItem<NotebookItem> NOTEBOOK = ITEMS.registerItem(
+            "notebook",
+            NotebookItem::new,
+            new Item.Properties().stacksTo(1)
+    );
+    public static final DeferredItem<InkVialItem> INK_VIAL = ITEMS.registerItem(
+            "ink_vial",
+            InkVialItem::new,
+            new Item.Properties().stacksTo(16)
+    );
+    public static final DeferredItem<BlockItem> WRITING_DESK = ITEMS.registerSimpleBlockItem(ModBlocks.WRITING_DESK);
 
     private ModItems() {
     }

src/main/java/net/dnorberg/rivencraft/registry/ModMenus.java

@@ -0,0 +1,28 @@
+package net.dnorberg.rivencraft.registry;
+
+import net.dnorberg.rivencraft.Rivencraft;
+import net.dnorberg.rivencraft.menu.NotebookMenu;
+import net.dnorberg.rivencraft.menu.WritingDeskMenu;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.world.inventory.MenuType;
+import net.neoforged.bus.api.IEventBus;
+import net.neoforged.neoforge.common.extensions.IMenuTypeExtension;
+import net.neoforged.neoforge.registries.DeferredHolder;
+import net.neoforged.neoforge.registries.DeferredRegister;
+
+public final class ModMenus {
+    private static final DeferredRegister<MenuType<?>> MENUS =
+            DeferredRegister.create(Registries.MENU, Rivencraft.MOD_ID);
+
+    public static final DeferredHolder<MenuType<?>, MenuType<NotebookMenu>> NOTEBOOK =
+            MENUS.register("notebook", () -> IMenuTypeExtension.create(NotebookMenu::new));
+    public static final DeferredHolder<MenuType<?>, MenuType<WritingDeskMenu>> WRITING_DESK =
+            MENUS.register("writing_desk", () -> IMenuTypeExtension.create(WritingDeskMenu::new));
+
+    private ModMenus() {
+    }
+
+    public static void register(IEventBus modEventBus) {
+        MENUS.register(modEventBus);
+    }
+}

src/main/java/net/dnorberg/rivencraft/writing/NotebookContents.java

@@ -0,0 +1,88 @@
+package net.dnorberg.rivencraft.writing;
+
+import com.mojang.serialization.Codec;
+import com.mojang.serialization.DataResult;
+import java.util.ArrayList;
+import java.util.List;
+import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.world.item.ItemStack;
+
+/** A bounded, position-preserving collection of Page stacks stored on a Notebook item. */
+public record NotebookContents(List<ItemStack> pages) {
+    public static final int MAX_PAGES = 27;
+    public static final NotebookContents EMPTY = new NotebookContents(List.of());
+    public static final Codec<NotebookContents> CODEC = ItemStack.OPTIONAL_CODEC.listOf()
+            .validate(NotebookContents::validate)
+            .xmap(NotebookContents::new, NotebookContents::pages);
+    public static final StreamCodec<RegistryFriendlyByteBuf, NotebookContents> STREAM_CODEC = StreamCodec.of(
+            NotebookContents::encode, NotebookContents::decode);
+
+    public NotebookContents {
+        if (pages.size() > MAX_PAGES) {
+            throw new IllegalArgumentException("Notebook exceeds " + MAX_PAGES + " page positions");
+        }
+        List<ItemStack> copies = new ArrayList<>(pages.size());
+        for (ItemStack page : pages) {
+            validatePage(page).getOrThrow();
+            copies.add(page.copy());
+        }
+        pages = List.copyOf(copies);
+    }
+
+    public int pageCount() {
+        return (int)pages.stream().filter(page -> !page.isEmpty()).count();
+    }
+
+    public int unresolvedCount() {
+        return (int)pages.stream()
+                .filter(page -> !page.isEmpty()
+                        && PageContent.Kind.UNRESOLVED_SYMBOL == PageItem.content(page).kind())
+                .count();
+    }
+
+    private static DataResult<List<ItemStack>> validate(List<ItemStack> pages) {
+        if (pages.size() > MAX_PAGES) {
+            return DataResult.error(() -> "Notebook exceeds " + MAX_PAGES + " page positions");
+        }
+        for (ItemStack page : pages) {
+            DataResult<ItemStack> result = validatePage(page);
+            if (result.error().isPresent()) {
+                return DataResult.error(() -> result.error().orElseThrow().message());
+            }
+        }
+        return DataResult.success(pages);
+    }
+
+    private static DataResult<ItemStack> validatePage(ItemStack page) {
+        if (page.isEmpty()) {
+            return DataResult.success(page);
+        }
+        if (!page.is(ModItems.PAGE.get())) {
+            return DataResult.error(() -> "Notebook contains a non-Page item");
+        }
+        return page.getCount() == 1
+                ? DataResult.success(page)
+                : DataResult.error(() -> "Notebook Page stacks must contain exactly one item");
+    }
+
+    private static void encode(RegistryFriendlyByteBuf buffer, NotebookContents contents) {
+        ByteBufCodecs.VAR_INT.encode(buffer, contents.pages.size());
+        contents.pages.forEach(page -> ItemStack.OPTIONAL_STREAM_CODEC.encode(buffer, page));
+    }
+
+    private static NotebookContents decode(RegistryFriendlyByteBuf buffer) {
+        int size = ByteBufCodecs.VAR_INT.decode(buffer);
+        if (size < 0 || size > MAX_PAGES) {
+            throw new IllegalArgumentException("Invalid Notebook page count " + size);
+        }
+        List<ItemStack> pages = new ArrayList<>(size);
+        for (int index = 0; index < size; index++) {
+            pages.add(ItemStack.OPTIONAL_STREAM_CODEC.decode(buffer));
+        }
+        return new NotebookContents(pages);
+    }
+}

src/main/java/net/dnorberg/rivencraft/writing/WritingInkService.java

@@ -0,0 +1,77 @@
+package net.dnorberg.rivencraft.writing;
+
+import net.dnorberg.rivencraft.config.RivencraftConfig;
+import net.dnorberg.rivencraft.item.InkVialItem;
+import net.dnorberg.rivencraft.item.PageItem;
+import net.dnorberg.rivencraft.registry.ModDataComponents;
+import net.dnorberg.rivencraft.registry.ModItems;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.Items;
+
+/** Server-owned costs and the baseline blank-page-to-link-panel transaction. */
+public final class WritingInkService {
+    private WritingInkService() {
+    }
+
+    public static int symbolCopyCost() {
+        return RivencraftConfig.symbolInkCost();
+    }
+
+    public static int linkPanelCost() {
+        return RivencraftConfig.linkPanelInkCost();
+    }
+
+    public static boolean canPrepareLinkPanel(Player player, InteractionHand vialHand) {
+        ItemStack vial = player.getItemInHand(vialHand);
+        ItemStack page = player.getItemInHand(other(vialHand));
+        int remaining = InkVialItem.remaining(vial);
+        return vial.is(ModItems.INK_VIAL.get()) && remaining >= linkPanelCost()
+                && remaining <= InkVialItem.CAPACITY
+                && page.is(ModItems.PAGE.get()) && PageItem.content(page).kind() == PageContent.Kind.BLANK;
+    }
+
+    public static boolean prepareLinkPanel(Player player, InteractionHand vialHand) {
+        if (player.level().isClientSide || !canPrepareLinkPanel(player, vialHand)) {
+            return false;
+        }
+
+        InteractionHand pageHand = other(vialHand);
+        ItemStack page = player.getItemInHand(pageHand);
+        ItemStack vial = player.getItemInHand(vialHand);
+        int newInk = InkVialItem.remaining(vial) - linkPanelCost();
+        ItemStack panel = PageItem.createLinkPanelPage();
+        ItemStack spentVial = newInk == 0
+                ? new ItemStack(Items.GLASS_BOTTLE)
+                : new ItemStack(ModItems.INK_VIAL.get());
+        if (newInk > 0) {
+            spentVial.set(ModDataComponents.INK_REMAINING.get(), newInk);
+        }
+
+        // All validation and output construction is complete before changing either input.
+        if (page.getCount() == 1) {
+            player.setItemInHand(pageHand, panel);
+        } else {
+            page.shrink(1);
+            giveOrDrop(player, panel);
+        }
+        if (vial.getCount() == 1) {
+            player.setItemInHand(vialHand, spentVial);
+        } else {
+            vial.shrink(1);
+            giveOrDrop(player, spentVial);
+        }
+        return true;
+    }
+
+    private static InteractionHand other(InteractionHand hand) {
+        return hand == InteractionHand.MAIN_HAND ? InteractionHand.OFF_HAND : InteractionHand.MAIN_HAND;
+    }
+
+    private static void giveOrDrop(Player player, ItemStack stack) {
+        if (!player.getInventory().add(stack)) {
+            player.drop(stack, false);
+        }
+    }
+}

src/main/resources/assets/rivencraft/blockstates/writing_desk.json

@@ -0,0 +1,8 @@
+{
+  "variants": {
+    "facing=north": { "model": "rivencraft:block/writing_desk" },
+    "facing=east": { "model": "rivencraft:block/writing_desk", "y": 90 },
+    "facing=south": { "model": "rivencraft:block/writing_desk", "y": 180 },
+    "facing=west": { "model": "rivencraft:block/writing_desk", "y": 270 }
+  }
+}

src/main/resources/assets/rivencraft/lang/en_us.json

@@ -12,6 +12,18 @@
   "item.rivencraft.page.link_panel": "Link Panel Page",
   "item.rivencraft.page.link_panel.description": "The baseline panel required to assemble a Descriptive Book.",
   "item.rivencraft.page.unresolved": "Unresolved Symbol Page",
+  "item.rivencraft.notebook": "Notebook",
+  "item.rivencraft.notebook.pages": "Pages: %s/%s",
+  "item.rivencraft.notebook.unresolved": "Unresolved pages: %s",
+  "item.rivencraft.ink_vial": "Ink Vial",
+  "block.rivencraft.writing_desk": "Writing Desk",
+  "container.rivencraft.writing_desk": "Writing Desk",
+  "screen.rivencraft.writing_desk.ink": "Ink: %s/%s",
+  "item.rivencraft.ink_vial.remaining": "Ink: %s/%s",
+  "item.rivencraft.ink_vial.usage": "Use with a blank Page in the other hand to prepare a Link Panel.",
+  "screen.rivencraft.notebook.search": "Search pages",
+  "screen.rivencraft.notebook.move_previous": "Move selected page left",
+  "screen.rivencraft.notebook.move_next": "Move selected page right",
   "message.rivencraft.linking_book.bind_hint": "Sneak-use to bind this book to your current location",
   "message.rivencraft.linking_book.unbound": "This Linking Book is unbound",
   "message.rivencraft.linking_book.bound": "Linking Book bound as %s",
@@ -89,5 +101,6 @@
   "screen.rivencraft.book.explore": "Explore",
   "screen.rivencraft.book.exploring": "Exploring",
   "screen.rivencraft.book.return_from_explore": "Right-click to return",
-  "itemGroup.rivencraft": "Rivencraft"
+  "itemGroup.rivencraft": "Rivencraft",
+  "itemGroup.rivencraft.pages": "Rivencraft Pages"
 }

src/main/resources/assets/rivencraft/models/block/writing_desk.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "rivencraft:item/writing_desk",
+    "side": "minecraft:block/oak_planks",
+    "bottom": "minecraft:block/oak_planks"
+  }
+}

src/main/resources/assets/rivencraft/models/item/ink_vial.json

@@ -0,0 +1,6 @@
+{
+  "parent": "minecraft:item/generated",
+  "textures": {
+    "layer0": "rivencraft:item/ink_vial"
+  }
+}

src/main/resources/assets/rivencraft/models/item/notebook.json

@@ -0,0 +1,6 @@
+{
+  "parent": "minecraft:item/generated",
+  "textures": {
+    "layer0": "rivencraft:item/notebook"
+  }
+}

src/main/resources/assets/rivencraft/models/item/writing_desk.json

@@ -0,0 +1,4 @@
+{
+  "parent": "minecraft:item/generated",
+  "textures": { "layer0": "rivencraft:item/writing_desk" }
+}

src/main/resources/assets/rivencraft/textures/item/ink_vial.png.mcmeta

@@ -0,0 +1,3 @@
+{
+  "animation": {}
+}

src/main/resources/data/rivencraft/loot_table/blocks/writing_desk.json

@@ -0,0 +1,4 @@
+{
+  "type": "minecraft:block",
+  "pools": [{ "rolls": 1, "entries": [{ "type": "minecraft:item", "name": "rivencraft:writing_desk" }] }]
+}

src/main/resources/data/rivencraft/recipe/ink_vial.json

@@ -0,0 +1,14 @@
+{
+  "type": "minecraft:crafting_shapeless",
+  "category": "misc",
+  "ingredients": [
+    { "item": "minecraft:black_dye" },
+    { "item": "minecraft:black_dye" },
+    { "item": "minecraft:glass_bottle" },
+    { "item": "minecraft:water_bucket" }
+  ],
+  "result": {
+    "count": 1,
+    "id": "rivencraft:ink_vial"
+  }
+}

src/main/resources/data/rivencraft/recipe/notebook.json

@@ -0,0 +1,21 @@
+{
+  "type": "minecraft:crafting_shaped",
+  "category": "misc",
+  "key": {
+    "L": {
+      "item": "minecraft:leather"
+    },
+    "S": {
+      "item": "minecraft:string"
+    }
+  },
+  "pattern": [
+    " L ",
+    "S  ",
+    " L "
+  ],
+  "result": {
+    "count": 1,
+    "id": "rivencraft:notebook"
+  }
+}

src/main/resources/data/rivencraft/recipe/writing_desk.json

@@ -0,0 +1,11 @@
+{
+  "type": "minecraft:crafting_shaped",
+  "category": "misc",
+  "pattern": ["V F", "PPP", "P P"],
+  "key": {
+    "V": { "item": "minecraft:glass_bottle" },
+    "F": { "item": "minecraft:feather" },
+    "P": { "tag": "minecraft:planks" }
+  },
+  "result": { "id": "rivencraft:writing_desk", "count": 1 }
+}