diff --git a/src/main.ts b/src/main.ts
index 3ff357d..e56c0a1 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,11 +1,11 @@
-import "./styles.css";
+import "./styles/globals.css";
 
 import {
   ROOT_SHIFT_COST,
   ROUND_ANIMATION_BONUS_MS,
   ROUND_ANIMATION_BRANCH_MS,
   ROUND_ANIMATION_SUN_MS,
-} from "./constants";
+} from "./engine/constants";
 import {
   buildChildrenMap as buildChildrenMapForState,
   buildParentMap as buildParentMapForState,
@@ -14,18 +14,18 @@ import {
   getNodeOwner as getNodeOwnerForState,
   getRootShiftMove as getRootShiftMoveForState,
   playerHasLegalMove as playerHasLegalMoveForState,
-} from "./rules-board";
+} from "./engine/rules-board";
 import {
   buildEnergySimulation,
   buildRoundAnimation as buildRoundAnimationForState,
   maybeRollDisease as maybeRollDiseaseForState,
   maybeRollSunbeam as maybeRollSunbeamForState,
   scoreColumns as scoreColumnsForState,
-} from "./rules-scoring";
+} from "./engine/rules-scoring";
 import {
   createInitiativeDraft,
   getInitiativeGraceRounds,
-} from "./rules-initiative";
+} from "./engine/rules-initiative";
 import {
   WEATHER_OFFER_PAIRS,
   createWeatherDraft,
@@ -33,7 +33,7 @@ import {
   getWeatherCard,
   isWeatherCardAvailable,
   isWeatherOfferResolved,
-} from "./rules-weather";
+} from "./engine/rules-weather";
 import {
   createInitialState,
   createPlayers,
@@ -41,7 +41,7 @@ import {
   createSetupState,
   getMaxStartingNodesPerPlayer,
   normalizeSeedInputs,
-} from "./state";
+} from "./engine/state";
 import type {
   GameState,
   GrowTarget,
@@ -52,8 +52,8 @@ import type {
   ShiftMove,
   TurnMove,
   WeatherCardId,
-} from "./types";
-import { keyFor, parseKey, tint, wait } from "./utils";
+} from "./engine/types";
+import { keyFor, parseKey, tint, wait } from "./engine/utils";
 
 const app = document.querySelector("#app");
 
@@ -520,6 +520,9 @@ function chooseWeatherAction(offerId: string, cardId: WeatherCardId, action: "dr
     return;
   }
 
+  const offer = draft.offers.find((entry) => entry.id === offerId);
+  const otherCardId = offer?.options.find((option) => option !== cardId) ?? null;
+
   const playerId = getCurrentWeatherPlayerId(draft);
   if (action === "draft") {
     const card = getWeatherCard(cardId);
@@ -531,6 +534,10 @@ function chooseWeatherAction(offerId: string, cardId: WeatherCardId, action: "dr
     state.history.unshift(`${state.players[playerId].name} banned ${card?.title ?? cardId}.`);
   }
 
+  if (otherCardId && !draft.locked.includes(otherCardId)) {
+    draft.locked.push(otherCardId);
+  }
+
   if (draft.draftIndex >= draft.playerOrder.length - 1) {
     finalizeWeatherDraft();
     render();
@@ -1077,7 +1084,7 @@ function renderWeatherDraftModal() {
           </div>
         </div>
         <div class="seed-editor">
-          <p class="seed-help">${currentPlayer?.name ?? "A player"} can draft or ban either card in each offer.</p>
+          <p class="seed-help">${currentPlayer?.name ?? "A player"} can draft or ban 1 card. Offered in pairs.</p>
           <div class="weather-key" aria-label="Weather action key">
             <span><strong>☀ Draft</strong>: take that card for 1 round</span>
             <span><strong>✕ Ban</strong>: remove just that card</span>
@@ -1094,13 +1101,14 @@ function renderWeatherDraftModal() {
                 <div>
                   <p class="eyebrow">Offer</p>
                   <div class="weather-pair">
-                    ${offer.options.map((cardId) => {
+                    ${offer.options.map((cardId, optionIndex) => {
                       const card = getWeatherCard(cardId);
                       const drafted = draft.drafted.includes(cardId);
                       const banned = draft.banned.includes(cardId);
+                      const locked = draft.locked.includes(cardId);
                       const available = isWeatherCardAvailable(draft, offer.id, cardId);
-                      return `
-                        <div class="weather-pair__option${drafted ? " weather-pair__option--drafted" : ""}${banned ? " weather-pair__option--banned" : ""}">
+                      return `${optionIndex === 1 ? `<div class="weather-pair__divider">-- OR --</div>` : ""}
+                        <div class="weather-pair__option${drafted ? " weather-pair__option--drafted" : ""}${banned ? " weather-pair__option--banned" : ""}${locked ? " weather-pair__option--locked" : ""}">
                           <h2>${card?.title ?? cardId}</h2>
                           <p>${card?.description ?? ""}</p>
                           ${available ? `
@@ -1114,7 +1122,7 @@ function renderWeatherDraftModal() {
                                 <span><strong>Ban</strong></span>
                               </button>
                             </div>
-                          ` : `<p class="weather-card__status">${drafted ? "Drafted" : "Banned"}</p>`}
+                          ` : `<p class="weather-card__status">${drafted ? "Drafted" : banned ? "Banned" : "Locked"}</p>`}
                         </div>
                       `;
                     }).join("")}
@@ -1396,7 +1404,6 @@ function renderSidebar() {
 
   return `
     <aside class="sidebar">
-      <button class="ghost-button new-game-launch" id="new-game">New Game</button>
       <section class="panel status-panel status-panel--weather">
         <h2>In Effect</h2>
         ${activeEffectsMarkup}
@@ -1455,7 +1462,10 @@ function renderSidebar() {
       </section>
 
       <section class="panel finish-panel">
-        <button id="finish-game" class="ghost-button finish-game-button" ${boardLocked ? "disabled" : ""}>End Game / Score Now</button>
+        <div class="button-row finish-panel__actions">
+          <button id="new-game" class="ghost-button finish-game-button">New Game</button>
+          <button id="finish-game" class="ghost-button finish-game-button" ${boardLocked ? "disabled" : ""}>End Game / Score Now</button>
+        </div>
       </section>
     </aside>
   `;