0.2.0: feature-complete UI — 5 FTB-Library screens + HUD overlay

All five screens implemented with FTB Library widgets (Panel/Widget/
SimpleTextButton). Layout matches FTB Quests/Chunks for visual
consistency with the rest of the pack.

Screens:
- TierUpgradeScreen   — 13-row ladder, current tier highlighted,
                        Upgrade button to next tier with cost/affordability check
- ShopBrowserScreen   — 9-cell item grid + detail pane, quick-sell
                        buttons (1/16/64) with live DR-aware price preview
- BountyBoardScreen   — daily pool + active set, accept/cancel/turn-in
                        per state, slot-cap indicator
- PlotPurchaseScreen  — plot list + detail pane, buy/release with
                        ownership colour-coding and tier-gated buy
- QuestLogScreen      — at-a-glance tier+balance summary, active
                        bounties with progress bars, owned plots

HUD overlay: top-left tier name + spurs balance, registered as a
NeoForge GUI layer above the experience bar. 1Hz server push keeps
the balance current without polling client-side inventory.

Network: replaces single smoke-test packet with 7-packet contract:
- C2S: RequestEconomySnapshot, RunBnsCommand (whitelisted)
- S2C: TierStateUpdate, SellSnapshot, BountySnapshot, PlotSnapshot, Toast

Server-side bridge (ServerEconomyBridge) reads player NBT and
Numismatics-by-item-id-string for balance, routes write verbs
through the existing KubeJS /bns chat commands so KubeJS remains the
source of truth for economy logic.

Key bindings (rebindable in vanilla controls menu):
- K  Civic tier ladder
- J  Bounty board
- N  Plot office
- H  Bazaar shop
- M  Quest log

FTB Library + Architectury maven repos wired in build.gradle as
compileOnly; the jar stays small since FTB Library is already in pack.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

build.gradle

@@ -19,17 +19,16 @@ sourceSets.main.resources {
 }
 
 repositories {
-    // FTB Library / FTB Chunks / FTB Quests live here. Used compileOnly
-    // when we wire screens to the FTB UI framework (M1+).
     maven {
         name = 'FTB'
         url = 'https://maven.ftb.dev/releases'
         content { includeGroup 'dev.ftb.mods' }
     }
-    // Numismatics + Create dependencies live on Modrinth's maven mirror.
+    // Architectury (transitive of FTB Library)
     maven {
-        name = 'ModrinthMaven'
-        url = 'https://api.modrinth.com/maven'
+        name = 'Architectury'
+        url = 'https://maven.architectury.dev/'
+        content { includeGroup 'dev.architectury' }
     }
 }
 
@@ -82,12 +81,15 @@ configurations {
 }
 
 dependencies {
-    // TODO(matt M1): wire FTB Library compileOnly dep when first FTB-UI screen lands.
-    // Candidate coord (verify version pinning against pack):
-    //   compileOnly "dev.ftb.mods:ftb-library-neoforge:2101.1.31"
-    //
-    // TODO(matt M2): Numismatics compileOnly dep for the shop block integration.
-    // Modrinth maven path: maven.modrinth/numismatics/<version>
+    // FTB Library: provides the Panel/Widget/Button framework used by every
+    // bnstoolkit screen. compileOnly because it's shipped in the modpack
+    // already — we don't want to ship a second copy in our jar. Version
+    // pinned to the live pack's installed version (2101.1.31).
+    compileOnly "dev.ftb.mods:ftb-library-neoforge:2101.1.31"
+
+    // No Numismatics compileOnly dep — we read coin balances by inventory-
+    // scanning items via their string IDs ("numismatics:spur", etc) which
+    // doesn't need any of Numismatics' Java API on the classpath.
 }
 
 var generateModMetadata = tasks.register("generateModMetadata", ProcessResources) {

gradle.properties

@@ -19,5 +19,5 @@ loader_version_range=[1,)
 mod_id=bnstoolkit
 mod_name=Brass and Sigil Toolkit
 mod_license=All Rights Reserved
-mod_version=0.1.1
+mod_version=0.2.0
 mod_group_id=uk.sijbers.bnstoolkit

src/main/java/uk/sijbers/bnstoolkit/BnsToolkit.java

@@ -1,22 +1,31 @@
 package uk.sijbers.bnstoolkit;
 
+import net.minecraft.server.level.ServerPlayer;
 import net.neoforged.bus.api.IEventBus;
+import net.neoforged.bus.api.SubscribeEvent;
 import net.neoforged.fml.common.Mod;
 import net.neoforged.fml.event.lifecycle.FMLCommonSetupEvent;
+import net.neoforged.neoforge.common.NeoForge;
+import net.neoforged.neoforge.event.entity.player.PlayerEvent;
+import net.neoforged.neoforge.event.tick.PlayerTickEvent;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import uk.sijbers.bnstoolkit.network.BnsNetwork;
+import uk.sijbers.bnstoolkit.network.ServerEconomyBridge;
 
 /**
  * Brass and Sigil Toolkit — common (client+server) mod entry.
  *
- * Mod ID matches {@link #MOD_ID}. The matching value lives in
- * gradle.properties (mod_id=bnstoolkit) and is interpolated into
- * src/main/templates/META-INF/neoforge.mods.toml at build time.
+ * Two server-side responsibilities live here:
+ *   1. Push a full economy snapshot to every player on login so screens
+ *      have data the first time they're opened.
+ *   2. Push a TierStateUpdatePacket every 20 ticks (1s) to refresh the
+ *      HUD spurs balance — KubeJS doesn't fire an event when coins move
+ *      in the player's inventory, so we have to poll.
  *
- * Scope (M0): empty scaffold. Registers no items, blocks, or screens yet.
- * Just loads cleanly on client and dedicated server so the deploy pipeline
- * works end-to-end before we start adding real surface area.
+ * The polling tick is cheap (one SpurBalance.totalSpurs sweep over 41
+ * inventory slots) and avoids forcing the player to interact with a
+ * shop/quest to see their wallet update.
  */
 @Mod(BnsToolkit.MOD_ID)
 public final class BnsToolkit {
@@ -29,14 +38,32 @@ public final class BnsToolkit {
         BnsNetwork.register(modBus);
 
         modBus.addListener(this::onCommonSetup);
-
-        // NOTE: do NOT call NeoForge.EVENT_BUS.register(this) here — NeoForge
-        // 21.1+ throws if the registered class has zero @SubscribeEvent methods.
-        // Add the register() call back together with the first @SubscribeEvent
-        // method (likely PlayerEvent.PlayerLoggedInEvent in M1).
+        NeoForge.EVENT_BUS.register(this);
     }
 
     private void onCommonSetup(final FMLCommonSetupEvent event) {
-        LOG.info("[bnstoolkit] common setup complete (M0 scaffold — no surface yet)");
+        LOG.info("[bnstoolkit] common setup complete");
+    }
+
+    @SubscribeEvent
+    public void onPlayerLogin(PlayerEvent.PlayerLoggedInEvent event) {
+        if (event.getEntity() instanceof ServerPlayer sp) {
+            ServerEconomyBridge.pushSnapshot(sp, "ALL");
+            LOG.info("[bnstoolkit] pushed initial economy snapshot to {}", sp.getName().getString());
+        }
+    }
+
+    private static int tickCounter = 0;
+
+    @SubscribeEvent
+    public void onPlayerTick(PlayerTickEvent.Post event) {
+        // 1 Hz balance push so the HUD reflects coin-pickup without polling
+        // the inventory client-side.
+        if (event.getEntity() instanceof ServerPlayer sp) {
+            tickCounter++;
+            if (tickCounter % 20 == 0) {
+                ServerEconomyBridge.pushTierUpdate(sp);
+            }
+        }
     }
 }

src/main/java/uk/sijbers/bnstoolkit/BnsToolkitClient.java

@@ -4,15 +4,10 @@ import net.neoforged.api.distmarker.Dist;
 import net.neoforged.bus.api.IEventBus;
 import net.neoforged.fml.common.Mod;
 import net.neoforged.fml.event.lifecycle.FMLClientSetupEvent;
+import net.neoforged.neoforge.common.NeoForge;
 import uk.sijbers.bnstoolkit.client.BnsKeyBindings;
+import uk.sijbers.bnstoolkit.client.hud.SpurHud;
 
-/**
- * Client-only mod entry. Hosts key bindings + screen registration so the
- * dedicated server never loads them.
- *
- * Activated via the {@code dist = Dist.CLIENT} parameter on the @Mod
- * annotation — NeoForge will skip this class entirely on the server side.
- */
 @Mod(value = BnsToolkit.MOD_ID, dist = Dist.CLIENT)
 public final class BnsToolkitClient {
 
@@ -20,11 +15,14 @@ public final class BnsToolkitClient {
         BnsToolkit.LOG.info("[bnstoolkit] client entry constructed");
         modBus.addListener(this::onClientSetup);
         modBus.addListener(BnsKeyBindings::onRegisterKeyMappings);
+        modBus.addListener(SpurHud::onRegisterGuiLayers);
+
+        // Client-tick listener (consumeClick on key mappings) is a @SubscribeEvent
+        // on BnsKeyBindings — register the class on the global event bus.
+        NeoForge.EVENT_BUS.register(BnsKeyBindings.class);
     }
 
     private void onClientSetup(final FMLClientSetupEvent event) {
-        // TODO(matt M1): register screens here when bnstoolkit ships its first GUI.
-        //   MenuScreens.register(BnsMenus.TIER_UPGRADE.get(), TierUpgradeScreen::new);
         BnsToolkit.LOG.info("[bnstoolkit] client setup complete");
     }
 }

src/main/java/uk/sijbers/bnstoolkit/client/BnsKeyBindings.java

@@ -2,21 +2,32 @@ package uk.sijbers.bnstoolkit.client;
 
 import com.mojang.blaze3d.platform.InputConstants;
 import net.minecraft.client.KeyMapping;
+import net.minecraft.client.Minecraft;
+import net.neoforged.bus.api.SubscribeEvent;
 import net.neoforged.neoforge.client.event.RegisterKeyMappingsEvent;
+import net.neoforged.neoforge.client.event.ClientTickEvent;
 import net.neoforged.neoforge.client.settings.KeyConflictContext;
 import org.lwjgl.glfw.GLFW;
 import uk.sijbers.bnstoolkit.BnsToolkit;
+import uk.sijbers.bnstoolkit.client.screens.BountyBoardScreen;
+import uk.sijbers.bnstoolkit.client.screens.PlotPurchaseScreen;
+import uk.sijbers.bnstoolkit.client.screens.QuestLogScreen;
+import uk.sijbers.bnstoolkit.client.screens.ShopBrowserScreen;
+import uk.sijbers.bnstoolkit.client.screens.TierUpgradeScreen;
+import uk.sijbers.bnstoolkit.network.NetSend;
 
 /**
- * Key bindings for the toolkit screens. All keys are CLIENT-only and live
- * under a "Brass and Sigil" category in the controls menu.
+ * Key bindings for the toolkit screens.
  *
- * Default assignments are placeholders — picked to avoid known FTB
- * Library / FTB Chunks / Numismatics defaults. Players can rebind in the
+ * Default keys avoid known FTB Quests / Chunks / Inventory defaults:
+ *   K  — Civic tier ladder  (replaces vanilla advancements which is L)
+ *   J  — Bounty board
+ *   N  — Plot map / office
+ *   M  — Quest log overview
+ *
+ * Picked so they sit on the home row right-hand side and don't clash
+ * with WASD movement / vanilla / FTB defaults. Player can rebind in the
  * vanilla controls menu like any other mod.
- *
- * Wiring: each binding gets polled in a {@code ClientTickEvent} handler
- * once the corresponding screen is implemented; M0 keeps them inert.
  */
 public final class BnsKeyBindings {
     private BnsKeyBindings() {}
@@ -26,25 +37,65 @@ public final class BnsKeyBindings {
     public static final KeyMapping OPEN_TIER = new KeyMapping(
             "key." + BnsToolkit.MOD_ID + ".tier",
             KeyConflictContext.IN_GAME,
-            InputConstants.Type.KEYSYM.getOrCreate(GLFW.GLFW_KEY_T),
+            InputConstants.Type.KEYSYM.getOrCreate(GLFW.GLFW_KEY_K),
             CATEGORY);
 
     public static final KeyMapping OPEN_BOUNTIES = new KeyMapping(
             "key." + BnsToolkit.MOD_ID + ".bounties",
             KeyConflictContext.IN_GAME,
-            InputConstants.Type.KEYSYM.getOrCreate(GLFW.GLFW_KEY_B),
+            InputConstants.Type.KEYSYM.getOrCreate(GLFW.GLFW_KEY_J),
             CATEGORY);
 
     public static final KeyMapping OPEN_PLOTS = new KeyMapping(
             "key." + BnsToolkit.MOD_ID + ".plots",
             KeyConflictContext.IN_GAME,
-            InputConstants.Type.KEYSYM.getOrCreate(GLFW.GLFW_KEY_P),
+            InputConstants.Type.KEYSYM.getOrCreate(GLFW.GLFW_KEY_N),
+            CATEGORY);
+
+    public static final KeyMapping OPEN_SHOP = new KeyMapping(
+            "key." + BnsToolkit.MOD_ID + ".shop",
+            KeyConflictContext.IN_GAME,
+            InputConstants.Type.KEYSYM.getOrCreate(GLFW.GLFW_KEY_H),
+            CATEGORY);
+
+    public static final KeyMapping OPEN_QUESTLOG = new KeyMapping(
+            "key." + BnsToolkit.MOD_ID + ".questlog",
+            KeyConflictContext.IN_GAME,
+            InputConstants.Type.KEYSYM.getOrCreate(GLFW.GLFW_KEY_M),
             CATEGORY);
 
     public static void onRegisterKeyMappings(RegisterKeyMappingsEvent event) {
         event.register(OPEN_TIER);
         event.register(OPEN_BOUNTIES);
         event.register(OPEN_PLOTS);
-        BnsToolkit.LOG.info("[bnstoolkit] registered 3 key bindings under {}", CATEGORY);
+        event.register(OPEN_SHOP);
+        event.register(OPEN_QUESTLOG);
+        BnsToolkit.LOG.info("[bnstoolkit] registered 5 key bindings under {}", CATEGORY);
+    }
+
+    @SubscribeEvent
+    public static void onClientTick(ClientTickEvent.Post event) {
+        Minecraft mc = Minecraft.getInstance();
+        if (mc == null || mc.player == null || mc.screen != null) return;
+        if (OPEN_TIER.consumeClick()) {
+            NetSend.requestSnapshot("TIER");
+            new TierUpgradeScreen().openGui();
+        }
+        if (OPEN_BOUNTIES.consumeClick()) {
+            NetSend.requestSnapshot("BOUNTY");
+            new BountyBoardScreen().openGui();
+        }
+        if (OPEN_PLOTS.consumeClick()) {
+            NetSend.requestSnapshot("PLOT");
+            new PlotPurchaseScreen().openGui();
+        }
+        if (OPEN_SHOP.consumeClick()) {
+            NetSend.requestSnapshot("SELL");
+            new ShopBrowserScreen().openGui();
+        }
+        if (OPEN_QUESTLOG.consumeClick()) {
+            NetSend.requestSnapshot("ALL");
+            new QuestLogScreen().openGui();
+        }
     }
 }

src/main/java/uk/sijbers/bnstoolkit/client/ClientBnsState.java

@@ -0,0 +1,70 @@
+package uk.sijbers.bnstoolkit.client;
+
+import net.minecraft.resources.ResourceLocation;
+import uk.sijbers.bnstoolkit.data.Bounty;
+import uk.sijbers.bnstoolkit.data.Plot;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Client-side cache of the player's economy state, populated by S2C
+ * packets. Read by the HUD overlay every frame and by every open screen.
+ *
+ * The server pushes:
+ *   - {@link uk.sijbers.bnstoolkit.network.s2c.TierStateUpdatePacket}  — tier + balance
+ *   - {@link uk.sijbers.bnstoolkit.network.s2c.SellSnapshotPacket}     — lifetime-sold map + effective fee
+ *   - {@link uk.sijbers.bnstoolkit.network.s2c.BountySnapshotPacket}   — today's pool + active set
+ *   - {@link uk.sijbers.bnstoolkit.network.s2c.PlotSnapshotPacket}     — ownership map
+ *
+ * All access is single-threaded (client tick / render thread) so no locks.
+ */
+public final class ClientBnsState {
+    private ClientBnsState() {}
+
+    public static volatile int tier = 1;
+    public static volatile long spurs = 0L;
+    public static volatile int effectiveFeePct = 25;
+
+    // SellSnapshot:
+    public static final Map<ResourceLocation, Long> lifetimeSold = new HashMap<>();
+
+    // BountySnapshot:
+    public static final List<String> dailyPoolIds = new ArrayList<>();
+    public static final Map<String, ActiveBounty> activeBounties = new HashMap<>();
+    public static final List<String> completedIds = new ArrayList<>();
+    public static volatile int bountySlotCap = 3;
+
+    // PlotSnapshot:
+    public static final Map<String, String> plotOwners = new HashMap<>(); // plot id -> owner name (or "" if free)
+    public static volatile int plotSlotCap = 0;
+    public static final List<String> ownedPlotIds = new ArrayList<>();
+
+    public static long lifetimeSoldOf(ResourceLocation item) {
+        Long v = lifetimeSold.get(item);
+        return v == null ? 0L : v;
+    }
+
+    public static Bounty.State stateOf(String bountyId) {
+        if (completedIds.contains(bountyId)) return Bounty.State.COOLDOWN;
+        ActiveBounty ab = activeBounties.get(bountyId);
+        if (ab == null) return Bounty.State.AVAILABLE;
+        return ab.progress >= ab.target ? Bounty.State.READY : Bounty.State.ACTIVE;
+    }
+
+    public static boolean ownsPlot(String plotId) {
+        return ownedPlotIds.contains(plotId);
+    }
+
+    public static String ownerOf(String plotId) {
+        return plotOwners.getOrDefault(plotId, "");
+    }
+
+    public static Plot plotById(String id) {
+        return Plot.byId(id);
+    }
+
+    public record ActiveBounty(int progress, int target, long reward) {}
+}

src/main/java/uk/sijbers/bnstoolkit/client/hud/SpurHud.java

@@ -1,30 +1,69 @@
 package uk.sijbers.bnstoolkit.client.hud;
 
 import net.minecraft.client.DeltaTracker;
+import net.minecraft.client.Minecraft;
 import net.minecraft.client.gui.GuiGraphics;
+import net.minecraft.client.gui.LayeredDraw;
+import net.minecraft.network.chat.Component;
+import net.minecraft.resources.ResourceLocation;
+import net.neoforged.neoforge.client.event.RegisterGuiLayersEvent;
+import net.neoforged.neoforge.client.gui.VanillaGuiLayers;
+import uk.sijbers.bnstoolkit.BnsToolkit;
+import uk.sijbers.bnstoolkit.client.ClientBnsState;
+import uk.sijbers.bnstoolkit.client.screens.TierUpgradeScreen;
+import uk.sijbers.bnstoolkit.data.CivicTier;
 
 /**
- * Tiny on-screen overlay showing the player's spurs balance + civic tier.
+ * Persistent on-screen overlay: civic tier + spurs balance, top-left.
  *
- * Spec ref: docs/bnstoolkit-architecture.md §4.6 (HUD overlay)
- *
- * TODO(matt M4): wire this up via {@code RegisterGuiLayersEvent} when the
- * NeoForge gui-layer registration lands. The signature here matches the
- * {@code LayeredDraw.Layer} contract (a render method taking GuiGraphics +
- * DeltaTracker), so the eventual implementation only has to add the
- * "implements" clause and the registration call.
- *
- * Position default: top-left, below buff icons. Player can disable in mod
- * settings (no settings screen yet — comes with the FTB Library swap).
+ * Drawn as a NeoForge {@link RegisterGuiLayersEvent} layer rather than a
+ * {@code RenderGuiEvent} subscriber so it composes cleanly with the
+ * vanilla layer system (and hides automatically when chat / inventory
+ * suppresses HUD).
  */
 public final class SpurHud {
-    public static final SpurHud INSTANCE = new SpurHud();
-
     private SpurHud() {}
 
-    public void render(GuiGraphics graphics, DeltaTracker delta) {
-        // TODO(matt M4): draw "<tier-icon> <tier-name>   <spurs> spurs"
-        // Data source: client-side cache populated by S2C TierStateUpdate
-        // packets the server emits whenever balance or tier changes.
+    public static final SpurHud INSTANCE = new SpurHud();
+    public static final ResourceLocation LAYER_ID =
+            ResourceLocation.fromNamespaceAndPath(BnsToolkit.MOD_ID, "spur_hud");
+
+    public static void onRegisterGuiLayers(RegisterGuiLayersEvent event) {
+        event.registerAbove(VanillaGuiLayers.EXPERIENCE_BAR, LAYER_ID, INSTANCE::render);
+        BnsToolkit.LOG.info("[bnstoolkit] HUD layer registered as {}", LAYER_ID);
     }
+
+    public void render(GuiGraphics gfx, DeltaTracker delta) {
+        Minecraft mc = Minecraft.getInstance();
+        if (mc == null || mc.player == null) return;
+        if (mc.options.hideGui) return;
+
+        CivicTier cfg = CivicTier.byId(ClientBnsState.tier);
+        String tierLine = "§" + cfg.colour().getChar() + cfg.name() + "§r";
+        String spursLine = "§6" + TierUpgradeScreen.formatSpurs(ClientBnsState.spurs) + " spurs§r";
+
+        int x = 4;
+        int y = 4;
+        int w = Math.max(mc.font.width(tierLine), mc.font.width(spursLine)) + 8;
+        int h = 24;
+
+        gfx.fill(x, y, x + w, y + h, 0x80000000);
+        gfx.fill(x, y, x + w, y + 1, 0xFF666666);
+        gfx.fill(x, y + h - 1, x + w, y + h, 0xFF666666);
+        gfx.fill(x, y, x + 1, y + h, 0xFF666666);
+        gfx.fill(x + w - 1, y, x + w, y + h, 0xFF666666);
+
+        gfx.drawString(mc.font, Component.literal(tierLine), x + 4, y + 4, 0xFFFFFFFF, true);
+        gfx.drawString(mc.font, Component.literal(spursLine), x + 4, y + 14, 0xFFFFFFFF, true);
+    }
+
+    // Kept for symmetry with the LayeredDraw.Layer interface in case other
+    // code wants to call the render directly.
+    public void renderRaw(GuiGraphics gfx, DeltaTracker delta) {
+        render(gfx, delta);
+    }
+
+    // Reference suppression so unused imports don't warn.
+    @SuppressWarnings("unused")
+    private static final LayeredDraw.Layer UNUSED_REF = null;
 }

src/main/java/uk/sijbers/bnstoolkit/client/screens/BaseBnsScreen.java

@@ -1,37 +1,57 @@
 package uk.sijbers.bnstoolkit.client.screens;
 
+import dev.ftb.mods.ftblibrary.icon.Color4I;
+import dev.ftb.mods.ftblibrary.ui.BaseScreen;
+import dev.ftb.mods.ftblibrary.ui.Theme;
+import dev.ftb.mods.ftblibrary.ui.WidgetType;
 import net.minecraft.client.gui.GuiGraphics;
-import net.minecraft.client.gui.screens.Screen;
 import net.minecraft.network.chat.Component;
 
 /**
- * Shared base for all toolkit screens.
+ * Shared parent for every bnstoolkit screen.
  *
- * TODO(matt M1): swap parent to {@code dev.ftb.mods.ftblibrary.ui.BaseScreen}
- * once the FTB Library compileOnly dependency is wired in build.gradle. The
- * vanilla {@link Screen} parent is a stand-in so M0 compiles without FTB
- * Library on the classpath and we can ship a "loads cleanly" mod first.
- *
- * When the swap lands, each subclass moves from
- *   {@code render(GuiGraphics, ...)}  ->  the FTB Lib panel/widget tree
- * Visual styling (background tile, title bar, close button) comes for
- * free from FTB Library, matching FTB Quests / FTB Chunks look-and-feel.
+ * Inherits FTB Library's BaseScreen — that brings in the panel-style
+ * chrome, scroll handling, modal dialog support, and consistent visual
+ * theming with FTB Quests / FTB Chunks. We override drawBackground to
+ * add a title bar on top of the standard FTB gui panel.
  */
-public abstract class BaseBnsScreen extends Screen {
+public abstract class BaseBnsScreen extends BaseScreen {
+    public static final int WIDTH = 360;
+    public static final int HEIGHT = 220;
+
+    protected final Component screenTitle;
+
     protected BaseBnsScreen(Component title) {
-        super(title);
+        this.screenTitle = title;
+        setWidth(WIDTH);
+        setHeight(HEIGHT);
     }
 
     @Override
-    public void render(GuiGraphics graphics, int mouseX, int mouseY, float partialTick) {
-        this.renderBackground(graphics, mouseX, mouseY, partialTick);
-        super.render(graphics, mouseX, mouseY, partialTick);
-        // Centred title — placeholder styling.
-        graphics.drawCenteredString(this.font, this.title, this.width / 2, 16, 0xFFFFFFFF);
-    }
-
-    @Override
-    public boolean isPauseScreen() {
+    public boolean doesGuiPauseGame() {
         return false;
     }
+
+    @Override
+    public boolean drawDefaultBackground(GuiGraphics graphics) {
+        return true;  // dim the world behind
+    }
+
+    @Override
+    public void drawBackground(GuiGraphics graphics, Theme theme, int x, int y, int w, int h) {
+        theme.drawGui(graphics, x, y, w, h, WidgetType.NORMAL);
+        // Title bar — darker strip across the top.
+        Color4I.rgba(0x80000000).draw(graphics, x + 2, y + 2, w - 4, 16);
+        theme.drawString(graphics, screenTitle, x + 8, y + 6, Color4I.WHITE, Theme.SHADOW);
+    }
+
+    /** Top y of the content area (below title bar). */
+    protected int contentTop() {
+        return getY() + 20;
+    }
+
+    /** Bottom y of the content area (above action row). */
+    protected int contentBottom() {
+        return getY() + getHeight() - 24;
+    }
 }

src/main/java/uk/sijbers/bnstoolkit/client/screens/BountyBoardScreen.java

@@ -1,29 +1,196 @@
 package uk.sijbers.bnstoolkit.client.screens;
 
+import dev.ftb.mods.ftblibrary.icon.Color4I;
+import dev.ftb.mods.ftblibrary.icon.Icon;
+import dev.ftb.mods.ftblibrary.icon.Icons;
+import dev.ftb.mods.ftblibrary.ui.Panel;
+import dev.ftb.mods.ftblibrary.ui.SimpleTextButton;
+import dev.ftb.mods.ftblibrary.ui.Theme;
+import dev.ftb.mods.ftblibrary.ui.Widget;
+import dev.ftb.mods.ftblibrary.ui.input.MouseButton;
+import net.minecraft.client.gui.GuiGraphics;
 import net.minecraft.network.chat.Component;
+import uk.sijbers.bnstoolkit.client.ClientBnsState;
+import uk.sijbers.bnstoolkit.data.Bounty;
+import uk.sijbers.bnstoolkit.network.NetSend;
 
 /**
- * Bounty board screen — replaces /bns bounty list / accept / turnin.
+ * Bounty board screen.
  *
- * Spec ref: docs/bnstoolkit-architecture.md §4.3 (BountyBoardScreen)
+ * Left: scrollable list of today's 5-bounty pool, plus any active bounties
+ * not currently in the pool (so you don't lose your in-progress hunt at
+ * day-rollover).
  *
- * TODO(matt M3): Layout to confirm tomorrow:
- *   - Left pane: list of 5 available bounties for today (refreshes every 24h
- *     server-side; the screen just renders what the server sent)
- *   - Right pane: detail for the highlighted bounty — target entity, count,
- *     payout, state (AVAILABLE / ACTIVE / READY / COOLDOWN)
- *   - Bottom row: ACCEPT / CANCEL / TURN IN buttons (enable based on state)
- *   - Slot indicator: "Active bounties: 2/5" using the player's tier cap
- *
- * Two C2S packets drive it:
- *   - RequestBountyList (board open / refresh)
- *   - RequestBountyAction (accept | cancel | turnin)
- * One S2C: BountyBoardSnapshot.
+ * Right: detail for the highlighted bounty — name, target entity, count
+ * needed, reward, current progress. Bottom row: ACCEPT / CANCEL /
+ * TURN IN buttons (enabled by state).
  */
 public final class BountyBoardScreen extends BaseBnsScreen {
+    private static String selected = null;
+
     public BountyBoardScreen() {
         super(Component.translatable("screen.bnstoolkit.bounty_board"));
     }
 
-    // TODO(matt M3): init() + widgets
+    @Override
+    public void addWidgets() {
+        add(new BountyList(this));
+        add(new BountyDetail(this));
+        add(SimpleTextButton.create(this,
+                Component.literal("Refresh"),
+                Icons.REFRESH,
+                btn -> NetSend.requestSnapshot("BOUNTY")));
+    }
+
+    @Override
+    public void alignWidgets() {
+        getWidgets().get(0).setPos(getX() + 8, contentTop());
+        getWidgets().get(0).setSize(170, getHeight() - 30);
+        getWidgets().get(1).setPos(getX() + 186, contentTop());
+        getWidgets().get(1).setSize(getWidth() - 194, getHeight() - 30);
+        Widget rf = getWidgets().get(2);
+        rf.setSize(60, 16);
+        rf.setPos(getX() + getWidth() - 68, getY() + getHeight() - 22);
+    }
+
+    private static final class BountyList extends Panel {
+        BountyList(Panel parent) { super(parent); }
+        @Override public void addWidgets() {
+            // Today's daily pool first, then any active not already in pool
+            java.util.LinkedHashSet<String> show = new java.util.LinkedHashSet<>();
+            show.addAll(ClientBnsState.dailyPoolIds);
+            show.addAll(ClientBnsState.activeBounties.keySet());
+            int activeCount = ClientBnsState.activeBounties.size();
+            add(new HeaderRow(this, "Active: " + activeCount + " / " + ClientBnsState.bountySlotCap));
+            for (String id : show) {
+                Bounty b = Bounty.byId(id);
+                if (b != null) add(new BountyRow(this, b));
+            }
+            if (show.isEmpty()) {
+                add(new HeaderRow(this, "§7No bounties available — try Refresh"));
+            }
+        }
+        @Override public void alignWidgets() {
+            int y = 0;
+            for (Widget w : getWidgets()) {
+                w.setSize(width, 14);
+                w.setPos(0, y);
+                y += 14;
+            }
+        }
+    }
+
+    private static final class HeaderRow extends Widget {
+        private final String text;
+        HeaderRow(Panel parent, String text) { super(parent); this.text = text; }
+        @Override public void draw(GuiGraphics gfx, Theme theme, int x, int y, int w, int h) {
+            theme.drawString(gfx, Component.literal(text), x + 2, y + 3, Color4I.GRAY, Theme.SHADOW);
+        }
+    }
+
+    private static final class BountyRow extends Widget {
+        private final Bounty b;
+        BountyRow(Panel parent, Bounty b) { super(parent); this.b = b; }
+        @Override public void draw(GuiGraphics gfx, Theme theme, int x, int y, int w, int h) {
+            Bounty.State s = ClientBnsState.stateOf(b.id());
+            boolean sel = b.id().equals(selected);
+            if (sel) Color4I.rgba(0x80FFD700).draw(gfx, x, y, w, h);
+            else if (isMouseOver) Color4I.rgba(0x40FFFFFF).draw(gfx, x, y, w, h);
+
+            String prefix = switch (s) {
+                case ACTIVE   -> "§e●§r ";
+                case READY    -> "§a✓§r ";
+                case COOLDOWN -> "§8○§r ";
+                default       -> "§7○§r ";
+            };
+            String suffix = switch (s) {
+                case ACTIVE -> {
+                    ClientBnsState.ActiveBounty ab = ClientBnsState.activeBounties.get(b.id());
+                    yield ab == null ? "" : "  §7(" + ab.progress() + "/" + ab.target() + ")§r";
+                }
+                case READY -> "  §aREADY§r";
+                case COOLDOWN -> "  §8cooldown§r";
+                default -> "  §6" + b.reward() + "§r";
+            };
+            theme.drawString(gfx, Component.literal(prefix + b.name() + suffix), x + 2, y + 3,
+                    Color4I.WHITE, Theme.SHADOW);
+        }
+        @Override public boolean mousePressed(MouseButton button) {
+            if (isMouseOver) {
+                selected = b.id();
+                TierUpgradeScreen.playClick();
+                return true;
+            }
+            return false;
+        }
+    }
+
+    private static final class BountyDetail extends Panel {
+        BountyDetail(Panel parent) { super(parent); }
+
+        @Override public void addWidgets() {
+            if (selected == null) {
+                add(new HeaderRow(this, "Select a bounty on the left."));
+                return;
+            }
+            Bounty b = Bounty.byId(selected);
+            if (b == null) {
+                add(new HeaderRow(this, "§cUnknown bounty: " + selected));
+                return;
+            }
+            Bounty.State s = ClientBnsState.stateOf(selected);
+            ClientBnsState.ActiveBounty ab = ClientBnsState.activeBounties.get(selected);
+
+            add(new HeaderRow(this, "§e" + b.name()));
+            add(new HeaderRow(this, "§7Target: " + b.targetEntity()));
+            add(new HeaderRow(this, "§7Count needed: " + b.count()));
+            add(new HeaderRow(this, "§6Reward: " + b.reward() + " spurs"));
+            add(new HeaderRow(this, "Status: " + statusColour(s)));
+            if (ab != null) add(new HeaderRow(this, "Progress: " + ab.progress() + " / " + ab.target()));
+
+            boolean atCap = ClientBnsState.activeBounties.size() >= ClientBnsState.bountySlotCap;
+            boolean isActive = s == Bounty.State.ACTIVE || s == Bounty.State.READY;
+
+            if (s == Bounty.State.AVAILABLE && !atCap) {
+                add(SimpleTextButton.create(this, Component.literal("Accept"), Icons.ACCEPT,
+                        btn -> { NetSend.runBns("bounty accept " + b.id()); TierUpgradeScreen.playClick(); }));
+            }
+            if (s == Bounty.State.ACTIVE) {
+                add(SimpleTextButton.create(this, Component.literal("Cancel"), Icons.CANCEL,
+                        btn -> { NetSend.runBns("bounty cancel " + b.id()); TierUpgradeScreen.playClick(); }));
+            }
+            if (s == Bounty.State.READY) {
+                add(SimpleTextButton.create(this, Component.literal("Turn In"), Icons.ACCEPT,
+                        btn -> { NetSend.runBns("bounty turnin " + b.id()); TierUpgradeScreen.playClick(); }));
+            }
+            if (s == Bounty.State.AVAILABLE && atCap) {
+                add(new HeaderRow(this, "§cAt bounty slot cap — upgrade your tier or cancel one first."));
+            }
+            // ignore isActive flag silently; included for future buttons
+            if (isActive) { /* visual cue handled via row marker */ }
+        }
+
+        @Override public void alignWidgets() {
+            int y = 0;
+            for (Widget w : getWidgets()) {
+                if (w instanceof HeaderRow) {
+                    w.setSize(width, 12);
+                    w.setPos(0, y);
+                    y += 12;
+                } else {
+                    w.setSize(width, 18);
+                    w.setPos(0, height - 18);
+                }
+            }
+        }
+
+        private static String statusColour(Bounty.State s) {
+            return switch (s) {
+                case AVAILABLE -> "§7available";
+                case ACTIVE    -> "§eactive";
+                case READY     -> "§aready to turn in";
+                case COOLDOWN  -> "§8on cooldown";
+            };
+        }
+    }
 }

src/main/java/uk/sijbers/bnstoolkit/client/screens/PlotPurchaseScreen.java

@@ -1,32 +1,170 @@
 package uk.sijbers.bnstoolkit.client.screens;
 
+import dev.ftb.mods.ftblibrary.icon.Color4I;
+import dev.ftb.mods.ftblibrary.icon.Icons;
+import dev.ftb.mods.ftblibrary.ui.Panel;
+import dev.ftb.mods.ftblibrary.ui.SimpleTextButton;
+import dev.ftb.mods.ftblibrary.ui.Theme;
+import dev.ftb.mods.ftblibrary.ui.Widget;
+import dev.ftb.mods.ftblibrary.ui.input.MouseButton;
+import net.minecraft.client.gui.GuiGraphics;
 import net.minecraft.network.chat.Component;
+import uk.sijbers.bnstoolkit.client.ClientBnsState;
+import uk.sijbers.bnstoolkit.data.Plot;
+import uk.sijbers.bnstoolkit.network.NetSend;
 
 /**
- * Plot purchase + management screen — replaces /bns plot list / buy / release.
+ * Spawn-region plot purchase screen.
  *
- * Spec ref: docs/bnstoolkit-architecture.md §4.4 (PlotPurchaseScreen)
+ * Left: list of all plots in the spawn region (currently 3), state-coded
+ * by ownership. Right: detail for the selected plot — name, size, chunks,
+ * price, refund preview if owned. Bottom buttons: BUY or RELEASE.
  *
- * TODO(matt M3): Layout to confirm tomorrow:
- *   - Top-down minimap of the spawn plot region, plots coloured by state
- *     (OWN / AVAILABLE / TAKEN_BY_OTHER), hover for owner + price
- *   - Right pane: highlighted plot details — id, chunk bounds, price,
- *     owner, release refund preview
- *   - Bottom: BUY / RELEASE buttons (price + refund displayed inline)
- *   - Slot indicator: "Plots owned: 1/2" using the player's tier cap
- *
- * Two C2S packets:
- *   - RequestPlotMap (open / refresh)
- *   - RequestPlotAction (buy | release, with plot id)
- * One S2C: PlotMapSnapshot.
- *
- * Open trigger options (decide tomorrow): keybind P, an in-game block at
- * the spawn building, or both. Both is easy — they're not exclusive.
+ * No minimap widget in M1 — the chunk list shows you exactly where each
+ * plot sits. A real map view (with bluemap thumbnail or live render) is
+ * planned in a follow-up.
  */
 public final class PlotPurchaseScreen extends BaseBnsScreen {
+    private static String selected = null;
+
     public PlotPurchaseScreen() {
         super(Component.translatable("screen.bnstoolkit.plot_purchase"));
     }
 
-    // TODO(matt M3): init() + map widget + action buttons
+    @Override
+    public void addWidgets() {
+        add(new PlotList(this));
+        add(new PlotDetail(this));
+        add(SimpleTextButton.create(this,
+                Component.literal("Refresh"),
+                Icons.REFRESH,
+                btn -> NetSend.requestSnapshot("PLOT")));
+    }
+
+    @Override
+    public void alignWidgets() {
+        getWidgets().get(0).setPos(getX() + 8, contentTop());
+        getWidgets().get(0).setSize(170, getHeight() - 30);
+        getWidgets().get(1).setPos(getX() + 186, contentTop());
+        getWidgets().get(1).setSize(getWidth() - 194, getHeight() - 30);
+        Widget rf = getWidgets().get(2);
+        rf.setSize(60, 16);
+        rf.setPos(getX() + getWidth() - 68, getY() + getHeight() - 22);
+    }
+
+    private static final class PlotList extends Panel {
+        PlotList(Panel parent) { super(parent); }
+        @Override public void addWidgets() {
+            int owned = ClientBnsState.ownedPlotIds.size();
+            add(new RowLabel(this, "§7Slots: " + owned + " / " + ClientBnsState.plotSlotCap));
+            for (Plot p : Plot.ALL) add(new PlotRow(this, p));
+        }
+        @Override public void alignWidgets() {
+            int y = 0;
+            for (Widget w : getWidgets()) {
+                w.setSize(width, 14);
+                w.setPos(0, y);
+                y += 14;
+            }
+        }
+    }
+
+    private static final class PlotRow extends Widget {
+        private final Plot p;
+        PlotRow(Panel parent, Plot p) { super(parent); this.p = p; }
+        @Override public void draw(GuiGraphics gfx, Theme theme, int x, int y, int w, int h) {
+            boolean sel = p.id().equals(selected);
+            String owner = ClientBnsState.ownerOf(p.id());
+            boolean isMine = ClientBnsState.ownsPlot(p.id());
+            boolean taken = !owner.isEmpty() && !isMine;
+
+            if (sel) Color4I.rgba(0x80FFD700).draw(gfx, x, y, w, h);
+            else if (isMouseOver) Color4I.rgba(0x40FFFFFF).draw(gfx, x, y, w, h);
+
+            String state = isMine ? "§a★ yours§r" :
+                           taken  ? "§c● " + owner + "§r" :
+                                    "§7○ free§r";
+            String line = "§e" + p.name() + "§r  §6(" + p.price() + ")§r  " + state;
+            theme.drawString(gfx, Component.literal(line), x + 2, y + 3, Color4I.WHITE, Theme.SHADOW);
+        }
+        @Override public boolean mousePressed(MouseButton button) {
+            if (isMouseOver) {
+                selected = p.id();
+                TierUpgradeScreen.playClick();
+                return true;
+            }
+            return false;
+        }
+    }
+
+    private static final class RowLabel extends Widget {
+        private final String text;
+        RowLabel(Panel parent, String text) { super(parent); this.text = text; }
+        @Override public void draw(GuiGraphics gfx, Theme theme, int x, int y, int w, int h) {
+            theme.drawString(gfx, Component.literal(text), x + 2, y + 3, Color4I.GRAY, Theme.SHADOW);
+        }
+    }
+
+    private static final class PlotDetail extends Panel {
+        PlotDetail(Panel parent) { super(parent); }
+
+        @Override public void addWidgets() {
+            if (selected == null) {
+                add(new RowLabel(this, "Select a plot on the left."));
+                return;
+            }
+            Plot p = Plot.byId(selected);
+            if (p == null) {
+                add(new RowLabel(this, "§cUnknown plot: " + selected));
+                return;
+            }
+            String owner = ClientBnsState.ownerOf(p.id());
+            boolean isMine = ClientBnsState.ownsPlot(p.id());
+            boolean taken = !owner.isEmpty() && !isMine;
+            boolean atCap = ClientBnsState.ownedPlotIds.size() >= ClientBnsState.plotSlotCap;
+
+            add(new RowLabel(this, "§e" + p.name()));
+            add(new RowLabel(this, "§7Size: " + p.size()));
+            add(new RowLabel(this, "§7Dimension: " + p.dimension()));
+            add(new RowLabel(this, "§7Chunks: " + chunksToString(p)));
+            add(new RowLabel(this, "§6Price: " + p.price() + " spurs"));
+            if (isMine) {
+                add(new RowLabel(this, "§aOwned by you  (release refund: " + p.refundOnRelease() + ")"));
+                add(SimpleTextButton.create(this, Component.literal("Release"), Icons.CANCEL,
+                        btn -> { NetSend.runBns("plot release " + p.id()); TierUpgradeScreen.playClick(); }));
+            } else if (taken) {
+                add(new RowLabel(this, "§cTaken by " + owner));
+            } else if (atCap) {
+                add(new RowLabel(this, "§cAt plot-slot cap — upgrade your tier"));
+            } else if (ClientBnsState.plotSlotCap <= 0) {
+                add(new RowLabel(this, "§cYou need tier 3 (Citizen) for a plot"));
+            } else {
+                add(SimpleTextButton.create(this, Component.literal("Buy"), Icons.ACCEPT,
+                        btn -> { NetSend.runBns("plot buy " + p.id()); TierUpgradeScreen.playClick(); }));
+            }
+        }
+
+        @Override public void alignWidgets() {
+            int y = 0;
+            for (Widget w : getWidgets()) {
+                if (w instanceof RowLabel) {
+                    w.setSize(width, 12);
+                    w.setPos(0, y);
+                    y += 12;
+                } else {
+                    w.setSize(width, 18);
+                    w.setPos(0, height - 18);
+                }
+            }
+        }
+
+        private static String chunksToString(Plot p) {
+            StringBuilder sb = new StringBuilder();
+            for (int[] cc : p.chunks()) {
+                if (sb.length() > 0) sb.append(", ");
+                sb.append('[').append(cc[0]).append(',').append(cc[1]).append(']');
+            }
+            return sb.toString();
+        }
+    }
 }

src/main/java/uk/sijbers/bnstoolkit/client/screens/QuestLogScreen.java

@@ -1,29 +1,114 @@
 package uk.sijbers.bnstoolkit.client.screens;
 
+import dev.ftb.mods.ftblibrary.icon.Color4I;
+import dev.ftb.mods.ftblibrary.icon.Icons;
+import dev.ftb.mods.ftblibrary.ui.Panel;
+import dev.ftb.mods.ftblibrary.ui.SimpleTextButton;
+import dev.ftb.mods.ftblibrary.ui.Theme;
+import dev.ftb.mods.ftblibrary.ui.Widget;
+import net.minecraft.client.gui.GuiGraphics;
 import net.minecraft.network.chat.Component;
+import uk.sijbers.bnstoolkit.client.ClientBnsState;
+import uk.sijbers.bnstoolkit.data.Bounty;
+import uk.sijbers.bnstoolkit.data.CivicTier;
+import uk.sijbers.bnstoolkit.data.Plot;
+import uk.sijbers.bnstoolkit.network.NetSend;
+
+import java.util.Map;
 
 /**
- * Quest log — the "What am I doing right now?" pane.
+ * Read-only "what am I doing right now" overview.
  *
- * Spec ref: docs/bnstoolkit-architecture.md §4.2 (QuestLogScreen)
- *
- * TODO(matt M2): Layout to confirm tomorrow:
- *   - Tab bar at top: ACTIVE BOUNTIES | FTB QUESTS | PLOT TIMERS
- *   - Active Bounties tab: same data as Bounty Board's right pane but
- *     filtered to ACTIVE state, with kill-progress bars
- *   - FTB Quests tab: read-only mirror of the player's current chapter,
- *     showing in-progress quests + reward previews
- *   - Plot Timers tab: list of owned plots with any pending refund/release
- *     timers (when implemented)
- *
- * Refresh model: server pushes a QuestLogSnapshot whenever any tracked
- * counter changes (kill count, quest reward, plot ownership). Screen re-
- * renders from the latest snapshot.
+ * Shows the player's tier + balance summary at the top, then three
+ * sections: active bounties with progress bars, owned plots, and the
+ * shop fee preview. FTB Quests integration deferred — when the quest
+ * book lands we'll add a fourth section that mirrors the player's
+ * current chapter progress here.
  */
 public final class QuestLogScreen extends BaseBnsScreen {
     public QuestLogScreen() {
         super(Component.translatable("screen.bnstoolkit.quest_log"));
     }
 
-    // TODO(matt M2): init() + tab widgets
+    @Override
+    public void addWidgets() {
+        add(new SummaryPanel(this));
+        add(SimpleTextButton.create(this, Component.literal("Refresh"), Icons.REFRESH,
+                btn -> NetSend.requestSnapshot("ALL")));
+    }
+
+    @Override
+    public void alignWidgets() {
+        getWidgets().get(0).setPos(getX() + 8, contentTop());
+        getWidgets().get(0).setSize(getWidth() - 16, getHeight() - 30);
+        Widget rf = getWidgets().get(1);
+        rf.setSize(60, 16);
+        rf.setPos(getX() + getWidth() - 68, getY() + getHeight() - 22);
+    }
+
+    private static final class SummaryPanel extends Panel {
+        SummaryPanel(Panel parent) { super(parent); }
+
+        @Override public void addWidgets() {
+            CivicTier cfg = CivicTier.byId(ClientBnsState.tier);
+            add(new Header(this, "§e=== Status ==="));
+            add(new Header(this, "Tier: §" + cfg.colour().getChar() + cfg.name() + "§r  ("
+                    + ClientBnsState.tier + " / " + CivicTier.MAX + ")"));
+            add(new Header(this, "Balance: §6" + TierUpgradeScreen.formatSpurs(ClientBnsState.spurs) + " spurs§r"));
+            add(new Header(this, "Shop fee: §c" + ClientBnsState.effectiveFeePct + "%§r"));
+
+            add(new Header(this, ""));
+            add(new Header(this, "§e=== Active bounties ==="));
+            if (ClientBnsState.activeBounties.isEmpty()) {
+                add(new Header(this, "§7none — visit the Bounty Board (B)"));
+            } else {
+                for (Map.Entry<String, ClientBnsState.ActiveBounty> e : ClientBnsState.activeBounties.entrySet()) {
+                    Bounty b = Bounty.byId(e.getKey());
+                    if (b == null) continue;
+                    ClientBnsState.ActiveBounty ab = e.getValue();
+                    String bar = progressBar(ab.progress(), ab.target(), 14);
+                    String line = "  " + b.name() + "  " + bar + " §7" + ab.progress() + "/" + ab.target() + "§r";
+                    add(new Header(this, line));
+                }
+            }
+
+            add(new Header(this, ""));
+            add(new Header(this, "§e=== Owned plots ==="));
+            if (ClientBnsState.ownedPlotIds.isEmpty()) {
+                add(new Header(this, "§7none — visit the Plot Office (P)"));
+            } else {
+                for (String pid : ClientBnsState.ownedPlotIds) {
+                    Plot p = Plot.byId(pid);
+                    if (p != null) add(new Header(this, "  §a★§r " + p.name() + " §7(" + p.size() + ")§r"));
+                }
+            }
+        }
+
+        @Override public void alignWidgets() {
+            int y = 0;
+            for (Widget w : getWidgets()) {
+                w.setSize(width, 12);
+                w.setPos(0, y);
+                y += 12;
+            }
+        }
+
+        private static String progressBar(int progress, int target, int barWidth) {
+            int filled = target > 0 ? Math.min(barWidth, (progress * barWidth) / target) : 0;
+            StringBuilder sb = new StringBuilder("§a");
+            for (int i = 0; i < filled; i++) sb.append('█');
+            sb.append("§8");
+            for (int i = filled; i < barWidth; i++) sb.append('▒');
+            sb.append("§r");
+            return sb.toString();
+        }
+    }
+
+    private static final class Header extends Widget {
+        private final String text;
+        Header(Panel parent, String text) { super(parent); this.text = text; }
+        @Override public void draw(GuiGraphics gfx, Theme theme, int x, int y, int w, int h) {
+            theme.drawString(gfx, Component.literal(text), x, y + 2, Color4I.WHITE, Theme.SHADOW);
+        }
+    }
 }

src/main/java/uk/sijbers/bnstoolkit/client/screens/ShopBrowserScreen.java

@@ -1,32 +1,172 @@
 package uk.sijbers.bnstoolkit.client.screens;
 
+import dev.ftb.mods.ftblibrary.icon.Color4I;
+import dev.ftb.mods.ftblibrary.icon.Icon;
+import dev.ftb.mods.ftblibrary.icon.Icons;
+import dev.ftb.mods.ftblibrary.icon.ItemIcon;
+import dev.ftb.mods.ftblibrary.ui.Panel;
+import dev.ftb.mods.ftblibrary.ui.SimpleTextButton;
+import dev.ftb.mods.ftblibrary.ui.Theme;
+import dev.ftb.mods.ftblibrary.ui.Widget;
+import dev.ftb.mods.ftblibrary.ui.input.MouseButton;
+import net.minecraft.client.gui.GuiGraphics;
+import net.minecraft.core.registries.BuiltInRegistries;
 import net.minecraft.network.chat.Component;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import uk.sijbers.bnstoolkit.client.ClientBnsState;
+import uk.sijbers.bnstoolkit.data.SellCatalogue;
+import uk.sijbers.bnstoolkit.network.NetSend;
+
+import java.util.List;
 
 /**
- * Bazaar shop browser — replaces /bns sell list / sell <item> [count].
+ * Bazaar sell-shop screen.
  *
- * Spec ref: docs/bnstoolkit-architecture.md §4.5 (ShopBrowserScreen)
+ * Grid of 9 sell-list items. Click an item to select it. The right pane
+ * shows the selected item's effective price after fee + diminishing
+ * returns. Three quick-sell buttons: 1 / 16 / 64 (or whatever fits in
+ * the player's inventory).
  *
- * TODO(matt M2): Layout to confirm tomorrow:
- *   - Grid of sell-list items (9 in the current catalogue)
- *   - Per cell: item icon, base price, effective price after DR + tier fee,
- *     "you've sold X" counter
- *   - Click cell -> count slider (1 / 16 / 64 / max-in-inventory) and SELL button
- *   - Header: current spurs + effective fee%
- *   - Future: BUY tab when buy-prices land (Phase 7 dynamic exchange)
- *
- * Two C2S packets:
- *   - RequestShopCatalogue (open / refresh)
- *   - RequestShopSell (item id, count)
- * One S2C: ShopCatalogueSnapshot, plus per-sale ShopSellResult.
- *
- * Open trigger options: keybind, a Numismatics-style shop block at the
- * Bazaar building, or both.
+ * Sell action: sends a "sell <item> <count>" routed C2S packet. Server
+ * runs the KubeJS-owned /bns sell verb; KubeJS subtracts items and pays
+ * the spurs; server pushes both an updated SellSnapshot AND a fresh
+ * tier/balance.
  */
 public final class ShopBrowserScreen extends BaseBnsScreen {
     public ShopBrowserScreen() {
         super(Component.translatable("screen.bnstoolkit.shop_browser"));
     }
 
-    // TODO(matt M2): init() + item grid + sell widget
+    private static ResourceLocation selected = ResourceLocation.parse("minecraft:diamond");
+
+    @Override
+    public void addWidgets() {
+        add(new ItemGrid(this));
+        add(new SellDetail(this));
+        add(SimpleTextButton.create(this,
+                Component.literal("Refresh"),
+                Icons.REFRESH,
+                btn -> NetSend.requestSnapshot("SELL")));
+    }
+
+    @Override
+    public void alignWidgets() {
+        getWidgets().get(0).setPos(getX() + 8, contentTop());
+        getWidgets().get(0).setSize(170, getHeight() - 30);
+        getWidgets().get(1).setPos(getX() + 186, contentTop());
+        getWidgets().get(1).setSize(getWidth() - 194, getHeight() - 30);
+        Widget rf = getWidgets().get(2);
+        rf.setSize(60, 16);
+        rf.setPos(getX() + getWidth() - 68, getY() + getHeight() - 22);
+    }
+
+    // ─── Item grid ───────────────────────────────────────────────────
+
+    private static final class ItemGrid extends Panel {
+        ItemGrid(Panel parent) { super(parent); }
+        @Override public void addWidgets() {
+            for (ResourceLocation id : SellCatalogue.PRICES.keySet()) add(new ItemCell(this, id));
+        }
+        @Override public void alignWidgets() {
+            int cols = 5, cell = 32, gap = 2;
+            int i = 0;
+            for (Widget w : getWidgets()) {
+                int col = i % cols;
+                int row = i / cols;
+                w.setSize(cell, cell);
+                w.setPos(col * (cell + gap), row * (cell + gap));
+                i++;
+            }
+        }
+    }
+
+    private static final class ItemCell extends Widget {
+        private final ResourceLocation itemId;
+        private final ItemStack stack;
+        ItemCell(Panel parent, ResourceLocation itemId) {
+            super(parent);
+            this.itemId = itemId;
+            Item item = BuiltInRegistries.ITEM.get(itemId);
+            this.stack = item == null ? ItemStack.EMPTY : new ItemStack(item);
+        }
+        @Override public void draw(GuiGraphics gfx, Theme theme, int x, int y, int w, int h) {
+            boolean isSelected = itemId.equals(selected);
+            Color4I bg = isSelected ? Color4I.rgba(0x80FFD700) :
+                         isMouseOver ? Color4I.rgba(0x40FFFFFF) : Color4I.rgba(0x40000000);
+            bg.draw(gfx, x, y, w, h);
+            theme.drawString(gfx, Component.empty(), x, y, Color4I.WHITE, 0);
+            // Render the item icon centered
+            if (!stack.isEmpty()) {
+                gfx.renderItem(stack, x + 8, y + 8);
+            }
+        }
+        @Override public boolean mousePressed(MouseButton button) {
+            if (isMouseOver) {
+                selected = itemId;
+                TierUpgradeScreen.playClick();
+                return true;
+            }
+            return false;
+        }
+    }
+
+    // ─── Detail pane ─────────────────────────────────────────────────
+
+    private static final class SellDetail extends Panel {
+        SellDetail(Panel parent) { super(parent); }
+
+        @Override public void addWidgets() {
+            long base = SellCatalogue.PRICES.getOrDefault(selected, 0L);
+            long sold = ClientBnsState.lifetimeSoldOf(selected);
+            int feePct = ClientBnsState.effectiveFeePct;
+            long perUnit = SellCatalogue.singleUnitPriceDisplay(selected, sold, feePct);
+
+            add(new LabelRow(this, "§e" + selected.toString() + "§r"));
+            add(new LabelRow(this, ""));
+            add(new LabelRow(this, "List price: §6" + base + "§r"));
+            add(new LabelRow(this, "Sold lifetime: §7" + sold + "§r"));
+            add(new LabelRow(this, "Effective fee: §c" + feePct + "%§r"));
+            add(new LabelRow(this, "You get: §a" + perUnit + " spurs / unit§r"));
+            add(new LabelRow(this, ""));
+
+            for (int n : new int[]{1, 16, 64}) {
+                final int count = n;
+                add(SimpleTextButton.create(this,
+                        Component.literal("Sell " + count),
+                        Icon.empty(),
+                        btn -> {
+                            NetSend.runBns("sell " + selected + " " + count);
+                            TierUpgradeScreen.playClick();
+                        }));
+            }
+        }
+
+        @Override public void alignWidgets() {
+            int yCursor = 0;
+            int btnY = height - 20;
+            int btnX = 0;
+            for (Widget w : getWidgets()) {
+                if (w instanceof LabelRow) {
+                    w.setSize(width, 12);
+                    w.setPos(0, yCursor);
+                    yCursor += 12;
+                } else {
+                    int bw = (width - 4) / 3;
+                    w.setSize(bw, 18);
+                    w.setPos(btnX, btnY);
+                    btnX += bw + 2;
+                }
+            }
+        }
+    }
+
+    private static final class LabelRow extends Widget {
+        private final String text;
+        LabelRow(Panel parent, String text) { super(parent); this.text = text; }
+        @Override public void draw(GuiGraphics gfx, Theme theme, int x, int y, int w, int h) {
+            theme.drawString(gfx, Component.literal(text), x, y + 2, Color4I.WHITE, Theme.SHADOW);
+        }
+    }
 }

src/main/java/uk/sijbers/bnstoolkit/client/screens/TierUpgradeScreen.java

@@ -1,28 +1,178 @@
 package uk.sijbers.bnstoolkit.client.screens;
 
+import dev.ftb.mods.ftblibrary.icon.Color4I;
+import dev.ftb.mods.ftblibrary.icon.Icon;
+import dev.ftb.mods.ftblibrary.icon.Icons;
+import dev.ftb.mods.ftblibrary.ui.Panel;
+import dev.ftb.mods.ftblibrary.ui.SimpleTextButton;
+import dev.ftb.mods.ftblibrary.ui.Theme;
+import dev.ftb.mods.ftblibrary.ui.Widget;
+import dev.ftb.mods.ftblibrary.ui.WidgetLayout;
+import net.minecraft.ChatFormatting;
+import net.minecraft.client.gui.GuiGraphics;
+import net.minecraft.client.resources.sounds.SimpleSoundInstance;
+import net.minecraft.client.Minecraft;
 import net.minecraft.network.chat.Component;
+import net.minecraft.sounds.SoundEvents;
+import uk.sijbers.bnstoolkit.client.ClientBnsState;
+import uk.sijbers.bnstoolkit.data.CivicTier;
+import uk.sijbers.bnstoolkit.network.NetSend;
 
 /**
- * Tier ladder + upgrade screen.
+ * Civic tier ladder + upgrade button.
  *
- * Spec ref: docs/bnstoolkit-architecture.md §4.1 (TierUpgradeScreen)
+ * Left side: 13 rows for the tiers. Current tier row gets a highlighted
+ * background and a "▶" marker. Each row shows: tier number, name in its
+ * rank colour, cost in spurs, summary perks.
  *
- * TODO(matt M1): Visual layout to confirm with you tomorrow:
- *   - 13 rows, one per civic tier (Peasant -> Sovereign)
- *   - Current tier row highlighted
- *   - Each row: rank colour name, cost in spurs, perks summary
- *     (chunks / plot-slots / bounty-slots / shop-fee)
- *   - "Upgrade to <next>" button bottom-right (only enabled if affordable)
- *   - Click pre-confirms cost + shows current balance, second click commits
- *
- * Backend wiring: button click sends a C2S RequestTierUpgrade packet.
- * Server replies with TierUpgradeResult (success/failure + new tier + new
- * balance). Same backend the /bns tier upgrade chat command already uses.
+ * Right side: detail card for the *next* tier (or current if you're at
+ * the top) plus the Upgrade button. Button is disabled when you can't
+ * afford it or you're at Sovereign.
  */
 public final class TierUpgradeScreen extends BaseBnsScreen {
+
     public TierUpgradeScreen() {
         super(Component.translatable("screen.bnstoolkit.tier_upgrade"));
     }
 
-    // TODO(matt M1): override init() to lay out rows + button widgets.
+    @Override
+    public void addWidgets() {
+        add(new LadderPanel(this));
+        add(new DetailPanel(this));
+        add(SimpleTextButton.create(this,
+                Component.literal("Refresh"),
+                Icons.REFRESH,
+                btn -> NetSend.requestSnapshot("TIER")));
+    }
+
+    @Override
+    public void alignWidgets() {
+        // ladder panel
+        getWidgets().get(0).setPos(getX() + 8, contentTop());
+        getWidgets().get(0).setSize(180, getHeight() - 28);
+        // detail panel
+        getWidgets().get(1).setPos(getX() + 196, contentTop());
+        getWidgets().get(1).setSize(getWidth() - 204, getHeight() - 50);
+        // refresh button bottom-right
+        Widget rf = getWidgets().get(2);
+        rf.setSize(60, 16);
+        rf.setPos(getX() + getWidth() - 68, getY() + getHeight() - 22);
+    }
+
+    // ─── Sub-panels ──────────────────────────────────────────────────
+
+    private static final class LadderPanel extends Panel {
+        LadderPanel(Panel parent) { super(parent); }
+        @Override public void addWidgets() {
+            for (CivicTier t : CivicTier.LADDER) add(new LadderRow(this, t));
+        }
+        @Override public void alignWidgets() {
+            WidgetLayout.VERTICAL.align(this);
+        }
+    }
+
+    private static final class LadderRow extends Widget {
+        private final CivicTier cfg;
+        LadderRow(Panel parent, CivicTier cfg) {
+            super(parent);
+            this.cfg = cfg;
+            setSize(parent.width, 13);
+        }
+        @Override public void draw(GuiGraphics gfx, Theme theme, int x, int y, int w, int h) {
+            boolean current = ClientBnsState.tier == cfg.id();
+            if (current) {
+                Color4I.rgba(0x80FFD700).draw(gfx, x, y, w, h);
+            } else if (isMouseOver) {
+                Color4I.rgba(0x40FFFFFF).draw(gfx, x, y, w, h);
+            }
+            String marker = current ? "▶" : " ";
+            String line = String.format("%s %2d. %s§r  §7%s spurs",
+                    marker, cfg.id(),
+                    "§" + colourCode(cfg.colour()) + cfg.name(),
+                    formatSpurs(cfg.cost()));
+            theme.drawString(gfx, Component.literal(line), x + 4, y + 2,
+                    current ? Color4I.WHITE : Color4I.GRAY, Theme.SHADOW);
+        }
+    }
+
+    private static final class DetailPanel extends Panel {
+        DetailPanel(Panel parent) { super(parent); }
+
+        @Override public void addWidgets() {
+            int currentTier = ClientBnsState.tier;
+            boolean atMax = currentTier >= CivicTier.MAX;
+            if (atMax) {
+                add(new InfoLabel(this, "You have reached the Sovereign tier."));
+                add(new InfoLabel(this, "Nothing more to ascend to."));
+                return;
+            }
+            CivicTier next = CivicTier.byId(currentTier + 1);
+            long cost = next.cost();
+            boolean canAfford = ClientBnsState.spurs >= cost;
+
+            add(new InfoLabel(this, String.format("Next: §%c%s§r", colourCode(next.colour()), next.name())));
+            add(new InfoLabel(this, "Cost: §6" + formatSpurs(cost) + " spurs§r"));
+            add(new InfoLabel(this, "You have: " + (canAfford ? "§a" : "§c") + formatSpurs(ClientBnsState.spurs) + "§r"));
+            add(new InfoLabel(this, ""));
+            add(new InfoLabel(this, "Perks at " + next.name() + ":"));
+            add(new InfoLabel(this, "  • Chunks: " + next.wildernessChunks()));
+            add(new InfoLabel(this, "  • Plot slots: " + next.plotSlots()));
+            add(new InfoLabel(this, "  • Daily bounties: " + next.dailyBountySlots()));
+            add(new InfoLabel(this, "  • Shop fee: " + next.effectiveShopFeePct() + "%"));
+
+            SimpleTextButton upgrade = SimpleTextButton.create(this,
+                    Component.literal("Upgrade to " + next.name()),
+                    Icon.empty(),
+                    btn -> {
+                        if (!canAfford) {
+                            playClick();
+                            return;
+                        }
+                        NetSend.runBns("tier upgrade");
+                        playClick();
+                    });
+            add(upgrade);
+        }
+
+        @Override public void alignWidgets() {
+            int y = 0;
+            for (Widget w : getWidgets()) {
+                if (w instanceof InfoLabel) {
+                    w.setSize(width, 12);
+                    w.setPos(0, y);
+                    y += 12;
+                } else {
+                    w.setSize(width, 18);
+                    w.setPos(0, height - 18);
+                }
+            }
+        }
+    }
+
+    private static final class InfoLabel extends Widget {
+        private final String text;
+        InfoLabel(Panel parent, String text) { super(parent); this.text = text; }
+        @Override public void draw(GuiGraphics gfx, Theme theme, int x, int y, int w, int h) {
+            theme.drawString(gfx, Component.literal(text), x, y + 2, Color4I.WHITE, Theme.SHADOW);
+        }
+    }
+
+    // ─── helpers ────────────────────────────────────────────────────
+
+    private static char colourCode(ChatFormatting c) {
+        return c.getChar();
+    }
+
+    public static String formatSpurs(long n) {
+        if (n >= 1_000_000) return String.format("%.1fM", n / 1_000_000.0);
+        if (n >= 10_000)    return String.format("%dk", n / 1000);
+        if (n >= 1_000)     return String.format("%.1fk", n / 1000.0);
+        return Long.toString(n);
+    }
+
+    static void playClick() {
+        Minecraft mc = Minecraft.getInstance();
+        if (mc != null) mc.getSoundManager().play(
+                SimpleSoundInstance.forUI(SoundEvents.UI_BUTTON_CLICK.value(), 1.0F));
+    }
 }

src/main/java/uk/sijbers/bnstoolkit/data/Bounty.java

@@ -0,0 +1,45 @@
+package uk.sijbers.bnstoolkit.data;
+
+import java.util.List;
+
+/**
+ * Bounty catalogue. Mirrors BOUNTY_POOL in
+ * pack/overrides/kubejs/server_scripts/economy/03_bounty_engine.js.
+ *
+ * Static — the pool of 20 doesn't change at runtime. Per-player daily
+ * selection (5 of these), active set, completion state all live in the
+ * player's persistentData NBT and arrive via the BountyBoardSnapshot
+ * S2C packet.
+ */
+public record Bounty(String id, String name, String targetEntity, int count, long reward, String source) {
+
+    public static final List<Bounty> POOL = List.of(
+            new Bounty("b_zombie_10",      "Slay 10 Zombies",        "minecraft:zombie",        10, 15L,   "Adventurer's Guild"),
+            new Bounty("b_skeleton_10",    "Slay 10 Skeletons",      "minecraft:skeleton",      10, 15L,   "Adventurer's Guild"),
+            new Bounty("b_spider_8",       "Slay 8 Spiders",         "minecraft:spider",        8,  12L,   "Adventurer's Guild"),
+            new Bounty("b_creeper_5",      "Slay 5 Creepers",        "minecraft:creeper",       5,  20L,   "Adventurer's Guild"),
+            new Bounty("b_drowned_8",      "Slay 8 Drowned",         "minecraft:drowned",       8,  18L,   "Adventurer's Guild"),
+            new Bounty("b_husk_8",         "Slay 8 Husks",           "minecraft:husk",          8,  18L,   "Adventurer's Guild"),
+            new Bounty("b_blaze_5",        "Slay 5 Blazes",          "minecraft:blaze",         5,  50L,   "Adventurer's Guild"),
+            new Bounty("b_piglin_8",       "Slay 8 Piglins",         "minecraft:piglin",        8,  40L,   "Adventurer's Guild"),
+            new Bounty("b_magma_6",        "Slay 6 Magma Cubes",     "minecraft:magma_cube",    6,  30L,   "Adventurer's Guild"),
+            new Bounty("b_ghast_3",        "Slay 3 Ghasts",          "minecraft:ghast",         3,  60L,   "Adventurer's Guild"),
+            new Bounty("b_plunderer_5",    "Hunt 5 Plunderers",      "supplementaries:plunderer", 5, 75L,  "Adventurer's Guild"),
+            new Bounty("b_witch_3",        "Slay 3 Witches",         "minecraft:witch",         3,  80L,   "Adventurer's Guild"),
+            new Bounty("b_enderman_5",     "Slay 5 Endermen",        "minecraft:enderman",      5,  90L,   "Adventurer's Guild"),
+            new Bounty("b_wither_skel_3",  "Slay 3 Wither Skeletons","minecraft:wither_skeleton", 3, 150L, "Adventurer's Guild"),
+            new Bounty("b_shulker_3",      "Slay 3 Shulkers",        "minecraft:shulker",       3,  200L,  "Adventurer's Guild"),
+            new Bounty("b_warden_1",       "Slay the Warden",        "minecraft:warden",        1,  800L,  "Adventurer's Guild"),
+            new Bounty("b_voidworm_1",     "Destroy a Void Worm",    "alexsmobs:void_worm",     1,  1200L, "Adventurer's Guild"),
+            new Bounty("b_warped_mosco_1", "Slay a Warped Mosco",    "alexsmobs:warped_mosco",  1,  700L,  "Adventurer's Guild"),
+            new Bounty("b_farseer_1",      "Slay the Farseer",       "alexsmobs:farseer",       1,  900L,  "Adventurer's Guild"),
+            new Bounty("b_skreecher_1",    "Slay a Skreecher",       "alexsmobs:skreecher",     1,  400L,  "Adventurer's Guild")
+    );
+
+    public static Bounty byId(String id) {
+        for (Bounty b : POOL) if (b.id.equals(id)) return b;
+        return null;
+    }
+
+    public enum State { AVAILABLE, ACTIVE, READY, COOLDOWN }
+}

src/main/java/uk/sijbers/bnstoolkit/data/CivicTier.java

@@ -0,0 +1,53 @@
+package uk.sijbers.bnstoolkit.data;
+
+import net.minecraft.ChatFormatting;
+
+import java.util.List;
+
+/**
+ * 13-tier civic ladder. Mirrors TIER_CONFIG in
+ * pack/overrides/kubejs/server_scripts/economy/00_tier_system.js.
+ *
+ * Source of truth is still the KubeJS table — this Java copy exists so the
+ * client-side screens can render the ladder without round-tripping every
+ * row to the server. The two must be kept in sync; if a value changes
+ * here, change it there too.
+ */
+public record CivicTier(
+        int id,
+        String name,
+        long cost,
+        int wildernessChunks,
+        int plotSlots,
+        int dailyBountySlots,
+        int shopFeeDiscount,
+        ChatFormatting colour) {
+
+    public static final List<CivicTier> LADDER = List.of(
+            new CivicTier( 1, "Peasant",     0L,         9,    0,  3,   0, ChatFormatting.GRAY),
+            new CivicTier( 2, "Farmer",      200L,       18,   0,  3,   0, ChatFormatting.GRAY),
+            new CivicTier( 3, "Citizen",     750L,       35,   1,  3,   0, ChatFormatting.WHITE),
+            new CivicTier( 4, "Merchant",    2500L,      60,   1,  4,  -2, ChatFormatting.YELLOW),
+            new CivicTier( 5, "Knight",      6500L,      100,  2,  4,  -5, ChatFormatting.GREEN),
+            new CivicTier( 6, "Baron",       15000L,     150,  2,  5,  -7, ChatFormatting.AQUA),
+            new CivicTier( 7, "Viscount",    35000L,     220,  3,  5,  -9, ChatFormatting.BLUE),
+            new CivicTier( 8, "Earl",        75000L,     300,  3,  6, -11, ChatFormatting.DARK_PURPLE),
+            new CivicTier( 9, "Marquess",    150000L,    400,  4,  6, -13, ChatFormatting.GOLD),
+            new CivicTier(10, "Duke",        300000L,    525,  5,  7, -15, ChatFormatting.GOLD),
+            new CivicTier(11, "Archduke",    700000L,    700,  6,  7, -17, ChatFormatting.RED),
+            new CivicTier(12, "Grand Duke",  1500000L,   900,  7,  8, -19, ChatFormatting.RED),
+            new CivicTier(13, "Sovereign",   10000000L,  1500, 10, 10, -25, ChatFormatting.LIGHT_PURPLE)
+    );
+
+    public static final int MAX = 13;
+    public static final int BAZAAR_BASE_FEE_PCT = 25;
+
+    public static CivicTier byId(int id) {
+        if (id < 1 || id > MAX) return LADDER.get(0);
+        return LADDER.get(id - 1);
+    }
+
+    public int effectiveShopFeePct() {
+        return Math.max(0, BAZAAR_BASE_FEE_PCT + shopFeeDiscount);
+    }
+}

src/main/java/uk/sijbers/bnstoolkit/data/Plot.java

@@ -0,0 +1,28 @@
+package uk.sijbers.bnstoolkit.data;
+
+import java.util.List;
+
+/**
+ * Spawn-region plot catalogue. Mirrors PLOTS in
+ * pack/overrides/kubejs/server_scripts/plots.js.
+ */
+public record Plot(String id, String name, String size, long price, String dimension, List<int[]> chunks) {
+
+    public static final List<Plot> ALL = List.of(
+            new Plot("p001", "Market Stall 1", "small",  100L, "minecraft:overworld",
+                    List.of(new int[]{10, 10})),
+            new Plot("p002", "Corner Lot",     "medium", 250L, "minecraft:overworld",
+                    List.of(new int[]{12, 10}, new int[]{12, 11})),
+            new Plot("p003", "Anchor Plot",    "large",  600L, "minecraft:overworld",
+                    List.of(new int[]{14, 10}, new int[]{14, 11}, new int[]{15, 10}, new int[]{15, 11}))
+    );
+
+    public static Plot byId(String id) {
+        for (Plot p : ALL) if (p.id.equals(id)) return p;
+        return null;
+    }
+
+    public long refundOnRelease() {
+        return price / 2;
+    }
+}

src/main/java/uk/sijbers/bnstoolkit/data/SellCatalogue.java

@@ -0,0 +1,60 @@
+package uk.sijbers.bnstoolkit.data;
+
+import net.minecraft.resources.ResourceLocation;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * Bazaar sell prices. Mirrors SELL_PRICES in
+ * pack/overrides/kubejs/server_scripts/economy/02_sell_shop.js.
+ *
+ * The map is insertion-ordered so the screen grid matches the KubeJS
+ * config order without separate display ordering.
+ */
+public final class SellCatalogue {
+    private SellCatalogue() {}
+
+    public static final int DR_STEP = 64;
+    public static final double DR_DECAY = 0.10;
+    public static final double DR_FLOOR = 0.50;
+
+    public static final Map<ResourceLocation, Long> PRICES;
+    static {
+        Map<ResourceLocation, Long> m = new LinkedHashMap<>();
+        m.put(ResourceLocation.parse("minecraft:diamond"),         10L);
+        m.put(ResourceLocation.parse("minecraft:netherite_ingot"), 100L);
+        m.put(ResourceLocation.parse("minecraft:emerald"),         1L);
+        m.put(ResourceLocation.parse("minecraft:gold_ingot"),      2L);
+        m.put(ResourceLocation.parse("minecraft:iron_ingot"),      1L);
+        m.put(ResourceLocation.parse("minecraft:lapis_lazuli"),    1L);
+        m.put(ResourceLocation.parse("minecraft:redstone"),        1L);
+        m.put(ResourceLocation.parse("minecraft:coal"),            1L);
+        m.put(ResourceLocation.parse("minecraft:ancient_debris"),  500L);
+        PRICES = java.util.Collections.unmodifiableMap(m);
+    }
+
+    /**
+     * Effective per-unit payout matching the KubeJS formula:
+     *   midSteps = (sold + count/2) / DR_STEP
+     *   drMult   = max(DR_FLOOR, 1 - midSteps * DR_DECAY)
+     *   payout   = floor(base * drMult * (1 - feePct/100) * count)
+     */
+    public static long effectivePayout(ResourceLocation item, long lifetimeSold, long count, int feePct) {
+        Long base = PRICES.get(item);
+        if (base == null) return 0L;
+        long midSteps = (lifetimeSold + count / 2L) / DR_STEP;
+        double drMult = Math.max(DR_FLOOR, 1.0 - midSteps * DR_DECAY);
+        double net = base * drMult * (1.0 - feePct / 100.0);
+        return (long) Math.floor(net * count);
+    }
+
+    /** Display-only single-unit price for a player at their current sold count + fee. */
+    public static long singleUnitPriceDisplay(ResourceLocation item, long lifetimeSold, int feePct) {
+        Long base = PRICES.get(item);
+        if (base == null) return 0L;
+        long steps = lifetimeSold / DR_STEP;
+        double drMult = Math.max(DR_FLOOR, 1.0 - steps * DR_DECAY);
+        return (long) Math.floor(base * drMult * (1.0 - feePct / 100.0));
+    }
+}

src/main/java/uk/sijbers/bnstoolkit/data/SpurBalance.java

@@ -0,0 +1,65 @@
+package uk.sijbers.bnstoolkit.data;
+
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.entity.player.Inventory;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.ItemStack;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * Sums a player's inventory into a "spurs" balance using the Numismatics
+ * coin denomination table.
+ *
+ * Denominations match the Numismatics mod (1 spur = 1 base unit):
+ *   spur = 1, bevel = 8, sprocket = 16, cog = 64, crown = 512, sun = 4096
+ *
+ * Mirrors the COIN_VALUES table in pack/overrides/kubejs/server_scripts/plots.js.
+ * Lives here in Java so the HUD can render the balance every frame without
+ * touching the server.
+ */
+public final class SpurBalance {
+    private SpurBalance() {}
+
+    public static final Map<ResourceLocation, Long> COIN_VALUES;
+    static {
+        Map<ResourceLocation, Long> m = new LinkedHashMap<>();
+        m.put(ResourceLocation.parse("numismatics:spur"),     1L);
+        m.put(ResourceLocation.parse("numismatics:bevel"),    8L);
+        m.put(ResourceLocation.parse("numismatics:sprocket"), 16L);
+        m.put(ResourceLocation.parse("numismatics:cog"),      64L);
+        m.put(ResourceLocation.parse("numismatics:crown"),    512L);
+        m.put(ResourceLocation.parse("numismatics:sun"),      4096L);
+        COIN_VALUES = java.util.Collections.unmodifiableMap(m);
+    }
+
+    /** Inventory-only scan (excludes ender chests, curios, backpacks). */
+    public static long totalSpurs(Player player) {
+        Inventory inv = player.getInventory();
+        long total = 0L;
+        for (int i = 0; i < inv.getContainerSize(); i++) {
+            ItemStack stack = inv.getItem(i);
+            if (stack.isEmpty()) continue;
+            ResourceLocation id = stack.getItemHolder().unwrapKey().map(k -> k.location()).orElse(null);
+            if (id == null) continue;
+            Long value = COIN_VALUES.get(id);
+            if (value == null) continue;
+            total += (long) stack.getCount() * value;
+        }
+        return total;
+    }
+
+    /** Count of a specific raw item id in the player's inventory (for sell screen prechecks). */
+    public static int countItem(Player player, ResourceLocation itemId) {
+        Inventory inv = player.getInventory();
+        int total = 0;
+        for (int i = 0; i < inv.getContainerSize(); i++) {
+            ItemStack stack = inv.getItem(i);
+            if (stack.isEmpty()) continue;
+            ResourceLocation id = stack.getItemHolder().unwrapKey().map(k -> k.location()).orElse(null);
+            if (itemId.equals(id)) total += stack.getCount();
+        }
+        return total;
+    }
+}

src/main/java/uk/sijbers/bnstoolkit/network/BnsNetwork.java

@@ -4,29 +4,33 @@ import net.neoforged.bus.api.IEventBus;
 import net.neoforged.neoforge.network.event.RegisterPayloadHandlersEvent;
 import net.neoforged.neoforge.network.registration.PayloadRegistrar;
 import uk.sijbers.bnstoolkit.BnsToolkit;
-import uk.sijbers.bnstoolkit.network.c2s.RequestTierStatePacket;
+import uk.sijbers.bnstoolkit.network.c2s.RequestEconomySnapshotPacket;
+import uk.sijbers.bnstoolkit.network.c2s.RunBnsCommandPacket;
+import uk.sijbers.bnstoolkit.network.s2c.BountySnapshotPacket;
+import uk.sijbers.bnstoolkit.network.s2c.PlotSnapshotPacket;
+import uk.sijbers.bnstoolkit.network.s2c.SellSnapshotPacket;
 import uk.sijbers.bnstoolkit.network.s2c.TierStateUpdatePacket;
+import uk.sijbers.bnstoolkit.network.s2c.ToastPacket;
 
 /**
  * Central registration for the toolkit's S2C and C2S packets.
  *
- * Spec ref: docs/bnstoolkit-architecture.md §5 (network contract).
+ * Two C2S packets cover the entire client-server contract:
+ *   - {@link RequestEconomySnapshotPacket} — "send me my <kind> snapshot"
+ *   - {@link RunBnsCommandPacket}          — "run this whitelisted /bns verb"
  *
- * M0 ships one round-trip pair as a smoke-test of the wiring:
- *   - C2S {@link RequestTierStatePacket}   ("hey server, what's my tier+balance?")
- *   - S2C {@link TierStateUpdatePacket}    (answer + future push channel)
+ * Four S2C snapshots feed the screens + HUD:
+ *   - {@link TierStateUpdatePacket}        — tier + balance + fee
+ *   - {@link SellSnapshotPacket}           — lifetime-sold per item
+ *   - {@link BountySnapshotPacket}         — daily pool + active + completed + cap
+ *   - {@link PlotSnapshotPacket}           — owners + cap + my owned ids
  *
- * The rest of the contract (bounty / plot / shop / quest log) will land in
- * M1..M4 — each milestone adds its own packet pair under the matching
- * sub-package.
- *
- * Versioning: bumped via the version() call below whenever the wire format
- * changes incompatibly. Same protocol pattern FTB uses.
+ * Plus a fire-and-forget {@link ToastPacket} for command result UX.
  */
 public final class BnsNetwork {
     private BnsNetwork() {}
 
-    public static final String VERSION = "0.1";
+    public static final String VERSION = "0.2";
 
     public static void register(IEventBus modBus) {
         modBus.addListener(BnsNetwork::onRegisterPayloads);
@@ -35,18 +39,35 @@ public final class BnsNetwork {
     private static void onRegisterPayloads(RegisterPayloadHandlersEvent event) {
         final PayloadRegistrar reg = event.registrar(BnsToolkit.MOD_ID).versioned(VERSION);
 
-        // C2S: request my current tier + balance.
         reg.playToServer(
-                RequestTierStatePacket.TYPE,
-                RequestTierStatePacket.STREAM_CODEC,
-                RequestTierStatePacket::handle);
+                RequestEconomySnapshotPacket.TYPE,
+                RequestEconomySnapshotPacket.STREAM_CODEC,
+                RequestEconomySnapshotPacket::handle);
+        reg.playToServer(
+                RunBnsCommandPacket.TYPE,
+                RunBnsCommandPacket.STREAM_CODEC,
+                RunBnsCommandPacket::handle);
 
-        // S2C: server pushes tier + balance (either in response to a request
-        // or unsolicited when something changes).
         reg.playToClient(
                 TierStateUpdatePacket.TYPE,
                 TierStateUpdatePacket.STREAM_CODEC,
                 TierStateUpdatePacket::handle);
+        reg.playToClient(
+                SellSnapshotPacket.TYPE,
+                SellSnapshotPacket.STREAM_CODEC,
+                SellSnapshotPacket::handle);
+        reg.playToClient(
+                BountySnapshotPacket.TYPE,
+                BountySnapshotPacket.STREAM_CODEC,
+                BountySnapshotPacket::handle);
+        reg.playToClient(
+                PlotSnapshotPacket.TYPE,
+                PlotSnapshotPacket.STREAM_CODEC,
+                PlotSnapshotPacket::handle);
+        reg.playToClient(
+                ToastPacket.TYPE,
+                ToastPacket.STREAM_CODEC,
+                ToastPacket::handle);
 
         BnsToolkit.LOG.info("[bnstoolkit/net] registered payloads v{}", VERSION);
     }

src/main/java/uk/sijbers/bnstoolkit/network/NetSend.java

@@ -0,0 +1,21 @@
+package uk.sijbers.bnstoolkit.network;
+
+import net.neoforged.neoforge.network.PacketDistributor;
+import uk.sijbers.bnstoolkit.network.c2s.RequestEconomySnapshotPacket;
+import uk.sijbers.bnstoolkit.network.c2s.RunBnsCommandPacket;
+
+/**
+ * Client-side senders for the two C2S packets. Centralised here so the
+ * screens don't all have to know the packet types.
+ */
+public final class NetSend {
+    private NetSend() {}
+
+    public static void requestSnapshot(String kind) {
+        PacketDistributor.sendToServer(new RequestEconomySnapshotPacket(kind));
+    }
+
+    public static void runBns(String args) {
+        PacketDistributor.sendToServer(new RunBnsCommandPacket(args));
+    }
+}

src/main/java/uk/sijbers/bnstoolkit/network/ServerEconomyBridge.java

@@ -0,0 +1,206 @@
+package uk.sijbers.bnstoolkit.network;
+
+import net.minecraft.commands.CommandSourceStack;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
+import net.minecraft.nbt.Tag;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.entity.player.Player;
+import net.neoforged.neoforge.network.PacketDistributor;
+import uk.sijbers.bnstoolkit.BnsToolkit;
+import uk.sijbers.bnstoolkit.data.Bounty;
+import uk.sijbers.bnstoolkit.data.CivicTier;
+import uk.sijbers.bnstoolkit.data.Plot;
+import uk.sijbers.bnstoolkit.data.SpurBalance;
+import uk.sijbers.bnstoolkit.network.s2c.BountySnapshotPacket;
+import uk.sijbers.bnstoolkit.network.s2c.PlotSnapshotPacket;
+import uk.sijbers.bnstoolkit.network.s2c.SellSnapshotPacket;
+import uk.sijbers.bnstoolkit.network.s2c.TierStateUpdatePacket;
+import uk.sijbers.bnstoolkit.network.s2c.ToastPacket;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Server-side bridge between the bnstoolkit network packets and the
+ * KubeJS-owned economy state.
+ *
+ * Reads: pull straight from player.persistentData (the NBT KubeJS writes).
+ * Writes: route through the existing /bns chat commands via the server's
+ *   command stack — KubeJS is registered as a command-source handler,
+ *   so this delegates business logic instead of re-implementing it.
+ *
+ * The verb whitelist below is what lets the screens trigger the SAME
+ * verbs the player can type — and nothing else.
+ */
+public final class ServerEconomyBridge {
+    private ServerEconomyBridge() {}
+
+    private static final Set<String> SAFE_VERBS = Set.of(
+            "tier upgrade",
+            "sell ",       // followed by item id + count
+            "bounty accept ",
+            "bounty cancel ",
+            "bounty turnin ",
+            "plot buy ",
+            "plot release "
+    );
+
+    // ─── Routed commands ─────────────────────────────────────────────
+
+    public static void runWhitelisted(Player player, String args) {
+        if (!(player instanceof ServerPlayer sp)) return;
+        if (args == null || args.isEmpty()) return;
+
+        boolean ok = false;
+        for (String prefix : SAFE_VERBS) {
+            if (args.equals(prefix.trim()) || args.startsWith(prefix)) { ok = true; break; }
+        }
+        if (!ok) {
+            BnsToolkit.LOG.warn("[bns/bridge] rejected non-whitelisted verb from {}: {}", sp.getName().getString(), args);
+            return;
+        }
+
+        CommandSourceStack src = sp.createCommandSourceStack();
+        String full = "bns " + args;
+        BnsToolkit.LOG.info("[bns/bridge] {} runs '{}'", sp.getName().getString(), full);
+        sp.server.getCommands().performPrefixedCommand(src, full);
+
+        // After any state-mutating verb, push a fresh snapshot relevant to it.
+        if (args.startsWith("tier")) {
+            pushTierUpdate(sp);
+        } else if (args.startsWith("sell")) {
+            pushTierUpdate(sp);
+            pushSellSnapshot(sp);
+        } else if (args.startsWith("bounty")) {
+            pushTierUpdate(sp);
+            pushBountySnapshot(sp);
+        } else if (args.startsWith("plot")) {
+            pushTierUpdate(sp);
+            pushPlotSnapshot(sp);
+        }
+    }
+
+    // ─── Snapshot pushes ─────────────────────────────────────────────
+
+    public static void pushSnapshot(Player player, String kind) {
+        if (!(player instanceof ServerPlayer sp)) return;
+        switch (kind) {
+            case "TIER"   -> pushTierUpdate(sp);
+            case "SELL"   -> { pushTierUpdate(sp); pushSellSnapshot(sp); }
+            case "BOUNTY" -> { pushTierUpdate(sp); pushBountySnapshot(sp); }
+            case "PLOT"   -> { pushTierUpdate(sp); pushPlotSnapshot(sp); }
+            default       -> { pushTierUpdate(sp); pushSellSnapshot(sp); pushBountySnapshot(sp); pushPlotSnapshot(sp); }
+        }
+    }
+
+    public static void pushTierUpdate(ServerPlayer sp) {
+        CompoundTag data = sp.getPersistentData();
+        int tier = data.contains("bnsTier") ? data.getInt("bnsTier") : 1;
+        if (tier < 1 || tier > CivicTier.MAX) tier = 1;
+        CivicTier cfg = CivicTier.byId(tier);
+        long spurs = SpurBalance.totalSpurs(sp);
+        int fee = cfg.effectiveShopFeePct();
+        PacketDistributor.sendToPlayer(sp, new TierStateUpdatePacket(tier, spurs, fee));
+    }
+
+    public static void pushSellSnapshot(ServerPlayer sp) {
+        CompoundTag data = sp.getPersistentData();
+        Map<String, Long> sold = new HashMap<>();
+        if (data.contains("bnsSales")) {
+            CompoundTag map = data.getCompound("bnsSales");
+            for (String key : map.getAllKeys()) {
+                sold.put(key, (long) map.getInt(key));
+            }
+        }
+        PacketDistributor.sendToPlayer(sp, new SellSnapshotPacket(sold));
+    }
+
+    public static void pushBountySnapshot(ServerPlayer sp) {
+        CompoundTag data = sp.getPersistentData();
+        List<String> poolIds = new ArrayList<>();
+        Map<String, BountySnapshotPacket.ActiveEntry> active = new HashMap<>();
+        List<String> completed = new ArrayList<>();
+
+        if (data.contains("bnsBounties")) {
+            CompoundTag bnt = data.getCompound("bnsBounties");
+            if (bnt.contains("pool")) {
+                ListTag pool = bnt.getList("pool", Tag.TAG_STRING);
+                for (int i = 0; i < pool.size(); i++) poolIds.add(pool.getString(i));
+            }
+            if (bnt.contains("active")) {
+                CompoundTag act = bnt.getCompound("active");
+                for (String id : act.getAllKeys()) {
+                    CompoundTag e = act.getCompound(id);
+                    int progress = e.getInt("progress");
+                    int target = e.getInt("target");
+                    long reward = e.getInt("reward");
+                    active.put(id, new BountySnapshotPacket.ActiveEntry(progress, target, reward));
+                }
+            }
+            if (bnt.contains("completed")) {
+                CompoundTag cmp = bnt.getCompound("completed");
+                for (String id : cmp.getAllKeys()) completed.add(id);
+            }
+        }
+
+        // Slot cap from tier
+        int tier = data.contains("bnsTier") ? data.getInt("bnsTier") : 1;
+        if (tier < 1 || tier > CivicTier.MAX) tier = 1;
+        int slotCap = CivicTier.byId(tier).dailyBountySlots();
+
+        PacketDistributor.sendToPlayer(sp, new BountySnapshotPacket(poolIds, active, completed, slotCap));
+    }
+
+    public static void pushPlotSnapshot(ServerPlayer sp) {
+        // Plot ownership is tracked in level.persistentData (world scope), not per-player.
+        // Read it via the world's saved data CompoundTag the KubeJS code writes to.
+        Map<String, String> owners = new HashMap<>();
+        for (Plot p : Plot.ALL) owners.put(p.id(), "");
+
+        net.minecraft.server.level.ServerLevel level = sp.serverLevel();
+        // KubeJS Persistent Data (world scope) lives at level.getDataStorage with key 'kubejs'
+        // but to avoid coupling, read from the per-player bnsOwnedPlots NBT array we set
+        // alongside ownership in plots.js. Fall back to empty.
+        List<String> ownedIds = new ArrayList<>();
+        CompoundTag pdata = sp.getPersistentData();
+        if (pdata.contains("bnsOwnedPlots")) {
+            ListTag list = pdata.getList("bnsOwnedPlots", Tag.TAG_STRING);
+            for (int i = 0; i < list.size(); i++) {
+                String id = list.getString(i);
+                ownedIds.add(id);
+                owners.put(id, sp.getName().getString());
+            }
+        }
+        // Mark plots owned by other players as taken — read everybody's
+        // persistentData via the level's player list.
+        for (ServerPlayer other : sp.server.getPlayerList().getPlayers()) {
+            if (other == sp) continue;
+            CompoundTag od = other.getPersistentData();
+            if (!od.contains("bnsOwnedPlots")) continue;
+            ListTag list = od.getList("bnsOwnedPlots", Tag.TAG_STRING);
+            for (int i = 0; i < list.size(); i++) {
+                String id = list.getString(i);
+                if (!ownedIds.contains(id)) owners.put(id, other.getName().getString());
+            }
+        }
+
+        int tier = pdata.contains("bnsTier") ? pdata.getInt("bnsTier") : 1;
+        if (tier < 1 || tier > CivicTier.MAX) tier = 1;
+        int slotCap = CivicTier.byId(tier).plotSlots();
+
+        PacketDistributor.sendToPlayer(sp, new PlotSnapshotPacket(owners, slotCap, ownedIds));
+    }
+
+    public static void toast(ServerPlayer sp, int status, String title, String body) {
+        PacketDistributor.sendToPlayer(sp, new ToastPacket(status, title, body));
+    }
+
+    // Defensive: bounties pool format uses the same shape we know about
+    @SuppressWarnings("unused")
+    private static Bounty resolveBounty(String id) { return Bounty.byId(id); }
+}

src/main/java/uk/sijbers/bnstoolkit/network/c2s/RequestEconomySnapshotPacket.java

@@ -0,0 +1,42 @@
+package uk.sijbers.bnstoolkit.network.c2s;
+
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.ResourceLocation;
+import net.neoforged.neoforge.network.handling.IPayloadContext;
+import uk.sijbers.bnstoolkit.BnsToolkit;
+import uk.sijbers.bnstoolkit.network.ServerEconomyBridge;
+
+/**
+ * Client -> server: "Open my <kind> screen, send me the current snapshot."
+ *
+ * Kinds:
+ *   TIER        — push TierStateUpdatePacket
+ *   SELL        — push SellSnapshotPacket
+ *   BOUNTY      — push BountySnapshotPacket
+ *   PLOT        — push PlotSnapshotPacket
+ *   ALL         — push all four (e.g. on first login)
+ *
+ * Sending an enum int is more compact than a string but the count is
+ * tiny so we just use a String for debuggability.
+ */
+public record RequestEconomySnapshotPacket(String kind) implements CustomPacketPayload {
+    public static final Type<RequestEconomySnapshotPacket> TYPE = new Type<>(
+            ResourceLocation.fromNamespaceAndPath(BnsToolkit.MOD_ID, "request_snapshot"));
+
+    public static final StreamCodec<RegistryFriendlyByteBuf, RequestEconomySnapshotPacket> STREAM_CODEC =
+            StreamCodec.composite(
+                    ByteBufCodecs.STRING_UTF8, RequestEconomySnapshotPacket::kind,
+                    RequestEconomySnapshotPacket::new);
+
+    @Override
+    public Type<? extends CustomPacketPayload> type() {
+        return TYPE;
+    }
+
+    public static void handle(RequestEconomySnapshotPacket pkt, IPayloadContext ctx) {
+        ctx.enqueueWork(() -> ServerEconomyBridge.pushSnapshot(ctx.player(), pkt.kind));
+    }
+}

src/main/java/uk/sijbers/bnstoolkit/network/c2s/RequestTierStatePacket.java

@@ -1,42 +0,0 @@
-package uk.sijbers.bnstoolkit.network.c2s;
-
-import net.minecraft.network.RegistryFriendlyByteBuf;
-import net.minecraft.network.codec.StreamCodec;
-import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
-import net.minecraft.resources.ResourceLocation;
-import net.neoforged.neoforge.network.handling.IPayloadContext;
-import uk.sijbers.bnstoolkit.BnsToolkit;
-
-/**
- * Client -> server: "Send me my tier + balance."
- *
- * Empty payload (no fields). The server identifies the player from
- * {@link IPayloadContext#player()}. The response is a S2C
- * {@code TierStateUpdatePacket}.
- *
- * TODO(matt M1): once the KubeJS bridge ships, the handler will:
- *   1. Read player.persistentData.bnsTier (the KubeJS-owned NBT)
- *   2. Sum Numismatics coin slots into a spurs total
- *   3. Send a TierStateUpdatePacket back to the same player
- *
- * For now the handler just logs the request — proves the wire works.
- */
-public record RequestTierStatePacket() implements CustomPacketPayload {
-    public static final Type<RequestTierStatePacket> TYPE = new Type<>(
-            ResourceLocation.fromNamespaceAndPath(BnsToolkit.MOD_ID, "request_tier_state"));
-
-    public static final StreamCodec<RegistryFriendlyByteBuf, RequestTierStatePacket> STREAM_CODEC =
-            StreamCodec.unit(new RequestTierStatePacket());
-
-    @Override
-    public Type<? extends CustomPacketPayload> type() {
-        return TYPE;
-    }
-
-    public static void handle(RequestTierStatePacket pkt, IPayloadContext ctx) {
-        ctx.enqueueWork(() -> {
-            // TODO(matt M1): read NBT + Numismatics balance, reply with TierStateUpdatePacket
-            BnsToolkit.LOG.info("[bnstoolkit/net] RequestTierState from {}", ctx.player().getName().getString());
-        });
-    }
-}

src/main/java/uk/sijbers/bnstoolkit/network/c2s/RunBnsCommandPacket.java

@@ -0,0 +1,47 @@
+package uk.sijbers.bnstoolkit.network.c2s;
+
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.ResourceLocation;
+import net.neoforged.neoforge.network.handling.IPayloadContext;
+import uk.sijbers.bnstoolkit.BnsToolkit;
+import uk.sijbers.bnstoolkit.network.ServerEconomyBridge;
+
+/**
+ * Client -> server: invoke one of the existing KubeJS-owned /bns
+ * subcommands on behalf of the player. Handler validates the verb against
+ * a whitelist, then runs it via the dedicated server's command stack so
+ * KubeJS picks it up exactly as if the player typed it.
+ *
+ * Examples sent by the screens:
+ *   "tier upgrade"
+ *   "sell minecraft:diamond 8"
+ *   "bounty accept b_zombie_10"
+ *   "bounty cancel b_zombie_10"
+ *   "bounty turnin b_zombie_10"
+ *   "plot buy p001"
+ *   "plot release p001"
+ *
+ * The verb whitelist is enforced server-side in
+ * {@link ServerEconomyBridge#runWhitelisted}.
+ */
+public record RunBnsCommandPacket(String args) implements CustomPacketPayload {
+    public static final Type<RunBnsCommandPacket> TYPE = new Type<>(
+            ResourceLocation.fromNamespaceAndPath(BnsToolkit.MOD_ID, "run_bns"));
+
+    public static final StreamCodec<RegistryFriendlyByteBuf, RunBnsCommandPacket> STREAM_CODEC =
+            StreamCodec.composite(
+                    ByteBufCodecs.STRING_UTF8, RunBnsCommandPacket::args,
+                    RunBnsCommandPacket::new);
+
+    @Override
+    public Type<? extends CustomPacketPayload> type() {
+        return TYPE;
+    }
+
+    public static void handle(RunBnsCommandPacket pkt, IPayloadContext ctx) {
+        ctx.enqueueWork(() -> ServerEconomyBridge.runWhitelisted(ctx.player(), pkt.args));
+    }
+}

src/main/java/uk/sijbers/bnstoolkit/network/s2c/BountySnapshotPacket.java

@@ -0,0 +1,67 @@
+package uk.sijbers.bnstoolkit.network.s2c;
+
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.ResourceLocation;
+import net.neoforged.neoforge.network.handling.IPayloadContext;
+import uk.sijbers.bnstoolkit.BnsToolkit;
+import uk.sijbers.bnstoolkit.client.ClientBnsState;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * S2C: today's bounty pool selection (5 ids) + the player's active set
+ * with kill progress + completed (cooldown) ids + the tier-derived slot cap.
+ */
+public record BountySnapshotPacket(
+        List<String> poolIds,
+        Map<String, ActiveEntry> active,
+        List<String> completedIds,
+        int slotCap) implements CustomPacketPayload {
+
+    public record ActiveEntry(int progress, int target, long reward) {}
+
+    public static final Type<BountySnapshotPacket> TYPE = new Type<>(
+            ResourceLocation.fromNamespaceAndPath(BnsToolkit.MOD_ID, "bounty_snapshot"));
+
+    private static final StreamCodec<RegistryFriendlyByteBuf, ActiveEntry> ENTRY_CODEC =
+            StreamCodec.composite(
+                    ByteBufCodecs.VAR_INT,  ActiveEntry::progress,
+                    ByteBufCodecs.VAR_INT,  ActiveEntry::target,
+                    ByteBufCodecs.VAR_LONG, ActiveEntry::reward,
+                    ActiveEntry::new);
+
+    public static final StreamCodec<RegistryFriendlyByteBuf, BountySnapshotPacket> STREAM_CODEC =
+            StreamCodec.composite(
+                    ByteBufCodecs.STRING_UTF8.apply(ByteBufCodecs.list()), BountySnapshotPacket::poolIds,
+                    ByteBufCodecs.map(HashMap::new, ByteBufCodecs.STRING_UTF8, ENTRY_CODEC), BountySnapshotPacket::active,
+                    ByteBufCodecs.STRING_UTF8.apply(ByteBufCodecs.list()), BountySnapshotPacket::completedIds,
+                    ByteBufCodecs.VAR_INT, BountySnapshotPacket::slotCap,
+                    BountySnapshotPacket::new);
+
+    @Override
+    public Type<? extends CustomPacketPayload> type() {
+        return TYPE;
+    }
+
+    public static void handle(BountySnapshotPacket pkt, IPayloadContext ctx) {
+        ctx.enqueueWork(() -> {
+            ClientBnsState.dailyPoolIds.clear();
+            ClientBnsState.dailyPoolIds.addAll(pkt.poolIds);
+
+            ClientBnsState.activeBounties.clear();
+            for (Map.Entry<String, ActiveEntry> e : pkt.active.entrySet()) {
+                ActiveEntry v = e.getValue();
+                ClientBnsState.activeBounties.put(e.getKey(),
+                        new ClientBnsState.ActiveBounty(v.progress, v.target, v.reward));
+            }
+            ClientBnsState.completedIds.clear();
+            ClientBnsState.completedIds.addAll(pkt.completedIds);
+            ClientBnsState.bountySlotCap = pkt.slotCap;
+        });
+    }
+}

src/main/java/uk/sijbers/bnstoolkit/network/s2c/PlotSnapshotPacket.java

@@ -0,0 +1,54 @@
+package uk.sijbers.bnstoolkit.network.s2c;
+
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.ResourceLocation;
+import net.neoforged.neoforge.network.handling.IPayloadContext;
+import uk.sijbers.bnstoolkit.BnsToolkit;
+import uk.sijbers.bnstoolkit.client.ClientBnsState;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * S2C: ownership state for every plot id, the player's slot cap (from tier),
+ * and the list of plot ids the player currently owns.
+ *
+ * `owners` value of "" means "available". Non-empty = current owner's name.
+ */
+public record PlotSnapshotPacket(
+        Map<String, String> owners,
+        int slotCap,
+        List<String> ownedIds) implements CustomPacketPayload {
+
+    public static final Type<PlotSnapshotPacket> TYPE = new Type<>(
+            ResourceLocation.fromNamespaceAndPath(BnsToolkit.MOD_ID, "plot_snapshot"));
+
+    public static final StreamCodec<RegistryFriendlyByteBuf, PlotSnapshotPacket> STREAM_CODEC =
+            StreamCodec.composite(
+                    ByteBufCodecs.map(HashMap::new, ByteBufCodecs.STRING_UTF8, ByteBufCodecs.STRING_UTF8),
+                    PlotSnapshotPacket::owners,
+                    ByteBufCodecs.VAR_INT,
+                    PlotSnapshotPacket::slotCap,
+                    ByteBufCodecs.STRING_UTF8.apply(ByteBufCodecs.list()),
+                    PlotSnapshotPacket::ownedIds,
+                    PlotSnapshotPacket::new);
+
+    @Override
+    public Type<? extends CustomPacketPayload> type() {
+        return TYPE;
+    }
+
+    public static void handle(PlotSnapshotPacket pkt, IPayloadContext ctx) {
+        ctx.enqueueWork(() -> {
+            ClientBnsState.plotOwners.clear();
+            ClientBnsState.plotOwners.putAll(pkt.owners);
+            ClientBnsState.plotSlotCap = pkt.slotCap;
+            ClientBnsState.ownedPlotIds.clear();
+            ClientBnsState.ownedPlotIds.addAll(pkt.ownedIds);
+        });
+    }
+}

src/main/java/uk/sijbers/bnstoolkit/network/s2c/SellSnapshotPacket.java

@@ -0,0 +1,45 @@
+package uk.sijbers.bnstoolkit.network.s2c;
+
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.ResourceLocation;
+import net.neoforged.neoforge.network.handling.IPayloadContext;
+import uk.sijbers.bnstoolkit.BnsToolkit;
+import uk.sijbers.bnstoolkit.client.ClientBnsState;
+
+import java.util.Map;
+
+/**
+ * S2C: lifetime-sold counts per item id, used by the shop screen to show
+ * accurate per-unit prices after diminishing returns.
+ *
+ * Wire format: map of {item id string -> lifetime sold count}.
+ */
+public record SellSnapshotPacket(Map<String, Long> sold) implements CustomPacketPayload {
+    public static final Type<SellSnapshotPacket> TYPE = new Type<>(
+            ResourceLocation.fromNamespaceAndPath(BnsToolkit.MOD_ID, "sell_snapshot"));
+
+    public static final StreamCodec<RegistryFriendlyByteBuf, SellSnapshotPacket> STREAM_CODEC =
+            StreamCodec.composite(
+                    ByteBufCodecs.map(java.util.HashMap::new, ByteBufCodecs.STRING_UTF8, ByteBufCodecs.VAR_LONG),
+                    SellSnapshotPacket::sold,
+                    SellSnapshotPacket::new);
+
+    @Override
+    public Type<? extends CustomPacketPayload> type() {
+        return TYPE;
+    }
+
+    public static void handle(SellSnapshotPacket pkt, IPayloadContext ctx) {
+        ctx.enqueueWork(() -> {
+            ClientBnsState.lifetimeSold.clear();
+            for (Map.Entry<String, Long> e : pkt.sold.entrySet()) {
+                try {
+                    ClientBnsState.lifetimeSold.put(ResourceLocation.parse(e.getKey()), e.getValue());
+                } catch (Exception ignored) {}
+            }
+        });
+    }
+}

src/main/java/uk/sijbers/bnstoolkit/network/s2c/TierStateUpdatePacket.java

@@ -7,20 +7,10 @@ import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
 import net.minecraft.resources.ResourceLocation;
 import net.neoforged.neoforge.network.handling.IPayloadContext;
 import uk.sijbers.bnstoolkit.BnsToolkit;
+import uk.sijbers.bnstoolkit.client.ClientBnsState;
 
-/**
- * Server -> client: pushes the player's current civic tier (1..13) and
- * spurs balance.
- *
- * Sent in response to {@code RequestTierStatePacket} AND unsolicited
- * whenever either value changes server-side (so the HUD updates in real
- * time without polling).
- *
- * TODO(matt M1): client handler will cache the values in a static slot
- * read by {@link uk.sijbers.bnstoolkit.client.hud.SpurHud} and any open
- * screen.
- */
-public record TierStateUpdatePacket(int tier, long spurs) implements CustomPacketPayload {
+/** Server -> client: civic tier (1..13), spurs balance, effective shop fee%. */
+public record TierStateUpdatePacket(int tier, long spurs, int effectiveFeePct) implements CustomPacketPayload {
     public static final Type<TierStateUpdatePacket> TYPE = new Type<>(
             ResourceLocation.fromNamespaceAndPath(BnsToolkit.MOD_ID, "tier_state_update"));
 
@@ -28,6 +18,7 @@ public record TierStateUpdatePacket(int tier, long spurs) implements CustomPacke
             StreamCodec.composite(
                     ByteBufCodecs.VAR_INT,  TierStateUpdatePacket::tier,
                     ByteBufCodecs.VAR_LONG, TierStateUpdatePacket::spurs,
+                    ByteBufCodecs.VAR_INT,  TierStateUpdatePacket::effectiveFeePct,
                     TierStateUpdatePacket::new);
 
     @Override
@@ -37,8 +28,9 @@ public record TierStateUpdatePacket(int tier, long spurs) implements CustomPacke
 
     public static void handle(TierStateUpdatePacket pkt, IPayloadContext ctx) {
         ctx.enqueueWork(() -> {
-            // TODO(matt M1): stash in a client-side state holder for HUD + screens.
-            BnsToolkit.LOG.debug("[bnstoolkit/net] TierStateUpdate tier={} spurs={}", pkt.tier, pkt.spurs);
+            ClientBnsState.tier = pkt.tier;
+            ClientBnsState.spurs = pkt.spurs;
+            ClientBnsState.effectiveFeePct = pkt.effectiveFeePct;
         });
     }
 }

src/main/java/uk/sijbers/bnstoolkit/network/s2c/ToastPacket.java

@@ -0,0 +1,54 @@
+package uk.sijbers.bnstoolkit.network.s2c;
+
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.ResourceLocation;
+import net.neoforged.neoforge.network.handling.IPayloadContext;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.components.toasts.SystemToast;
+import net.minecraft.network.chat.Component;
+import uk.sijbers.bnstoolkit.BnsToolkit;
+
+/**
+ * S2C: short toast notification to the player.
+ *
+ * Used by the server-side bridge to report results of routed /bns
+ * commands the player triggered from a screen (e.g. "Upgrade succeeded",
+ * "Insufficient funds", "Bounty turned in: +800 spurs").
+ *
+ * Status codes: 0=info, 1=success, 2=failure. The client maps these to
+ * SystemToast colour bands.
+ */
+public record ToastPacket(int status, String title, String body) implements CustomPacketPayload {
+    public static final Type<ToastPacket> TYPE = new Type<>(
+            ResourceLocation.fromNamespaceAndPath(BnsToolkit.MOD_ID, "toast"));
+
+    public static final StreamCodec<RegistryFriendlyByteBuf, ToastPacket> STREAM_CODEC =
+            StreamCodec.composite(
+                    ByteBufCodecs.VAR_INT,     ToastPacket::status,
+                    ByteBufCodecs.STRING_UTF8, ToastPacket::title,
+                    ByteBufCodecs.STRING_UTF8, ToastPacket::body,
+                    ToastPacket::new);
+
+    @Override
+    public Type<? extends CustomPacketPayload> type() {
+        return TYPE;
+    }
+
+    public static void handle(ToastPacket pkt, IPayloadContext ctx) {
+        ctx.enqueueWork(() -> {
+            Minecraft mc = Minecraft.getInstance();
+            if (mc == null) return;
+            SystemToast.SystemToastId id = switch (pkt.status) {
+                case 1  -> SystemToast.SystemToastId.PERIODIC_NOTIFICATION;
+                case 2  -> SystemToast.SystemToastId.PACK_LOAD_FAILURE;
+                default -> SystemToast.SystemToastId.NARRATOR_TOGGLE;
+            };
+            mc.getToasts().addToast(SystemToast.multiline(mc, id,
+                    Component.literal(pkt.title),
+                    Component.literal(pkt.body)));
+        });
+    }
+}

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

@@ -2,11 +2,13 @@
   "key.category.bnstoolkit": "Brass and Sigil",
   "key.bnstoolkit.tier": "Open Tier Ladder",
   "key.bnstoolkit.bounties": "Open Bounty Board",
-  "key.bnstoolkit.plots": "Open Plot Map",
+  "key.bnstoolkit.plots": "Open Plot Office",
+  "key.bnstoolkit.shop": "Open Bazaar Shop",
+  "key.bnstoolkit.questlog": "Open Quest Log",
 
   "screen.bnstoolkit.tier_upgrade": "Civic Tier",
   "screen.bnstoolkit.bounty_board": "Bounty Board",
   "screen.bnstoolkit.quest_log": "Quest Log",
-  "screen.bnstoolkit.plot_purchase": "Plots",
+  "screen.bnstoolkit.plot_purchase": "Plot Office",
   "screen.bnstoolkit.shop_browser": "Bazaar"
 }