Session 12: Save Slot System (3 slots, autosave toggle, cross-slot import/export) + fix goldenBlooms field missing from reset()/switchSlot empty-state

css/game.css

@@ -515,6 +515,98 @@ h2, h3 {
     border-color: var(--danger);
 }
 
+/* Save Slot System */
+.footer-section {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    padding-right: 10px;
+    border-right: 1px solid var(--border-color);
+}
+
+.footer-section:last-of-type {
+    border-right: none;
+    margin-left: auto;
+}
+
+.footer-label {
+    color: var(--text-secondary);
+    font-size: 0.8rem;
+    font-weight: bold;
+}
+
+.slot-btn {
+    background: var(--bg-card);
+    color: var(--text-secondary);
+    border: 1px solid var(--border-color);
+    border-radius: 6px;
+    padding: 6px 12px;
+    cursor: pointer;
+    font-weight: bold;
+    transition: all 0.2s ease;
+    min-width: 34px;
+}
+
+.slot-btn:hover:not(:disabled) {
+    background: var(--bg-hover);
+    border-color: var(--accent-purple);
+    color: var(--text-primary);
+}
+
+.slot-btn.active {
+    background: var(--accent-purple);
+    color: var(--text-primary);
+    border-color: var(--accent-gold);
+    box-shadow: 0 0 12px rgba(155, 89, 182, 0.6);
+}
+
+.slot-btn:disabled {
+    cursor: default;
+    opacity: 0.5;
+}
+
+/* Autosave toggle button */
+.toggle-btn {
+    background: var(--bg-card);
+    color: var(--text-secondary);
+    border: 1px solid var(--border-color);
+    border-radius: 6px;
+    padding: 8px 14px;
+    cursor: pointer;
+    font-weight: bold;
+    transition: all 0.2s ease;
+}
+
+.toggle-btn.on {
+    background: var(--accent-green);
+    color: #0a0a1a;
+    border-color: var(--accent-green);
+}
+
+.toggle-btn:not(.on) {
+    background: var(--bg-card);
+    color: var(--text-muted);
+}
+
+/* Import modal slot selector */
+.import-slot-selector {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    margin: 12px 0;
+}
+
+.import-slot-label {
+    color: var(--text-secondary);
+    font-size: 0.85rem;
+}
+
+.modal-hint {
+    color: var(--text-muted);
+    font-size: 0.8rem;
+    margin-bottom: 10px;
+}
+
 #last-saved {
     margin-left: auto;
     color: var(--text-muted);

index.html

@@ -63,7 +63,7 @@
                 </div>
 
                 <div id="achievements-tab" class="tab-content">
-                    <h3>Achievements (0/33)</h3>
+                    <h3>Achievements (0/31)</h3>
                     <div id="achievements-list"></div>
                 </div>
 
@@ -103,10 +103,22 @@
 
         <!-- Footer: Controls -->
         <footer id="game-footer">
-            <button id="save-btn">💾 Save</button>
+            <div class="footer-section">
-            <button id="export-btn">📤 Export Save</button>
+                <span class="footer-label">Slot:</span>
-            <button id="import-btn">📥 Import Save</button>
+                <button class="slot-btn" data-slot="0">1</button>
-            <button id="reset-btn">🗑️ Reset</button>
+                <button class="slot-btn" data-slot="1">2</button>
+                <button class="slot-btn" data-slot="2">3</button>
+            </div>
+            <div class="footer-section">
+                <span class="footer-label">Auto:</span>
+                <button id="autosave-btn" class="toggle-btn on">ON</button>
+            </div>
+            <div class="footer-section">
+                <button id="save-btn">💾 Save</button>
+                <button id="export-btn">📤 Export</button>
+                <button id="import-btn">📥 Import</button>
+                <button id="reset-btn">🗑️ Reset</button>
+            </div>
             <span id="last-saved"></span>
         </footer>
     </div>
@@ -118,7 +130,14 @@
     <div id="import-modal" class="modal hidden">
         <div class="modal-content">
             <h3>Import Save</h3>
+            <p class="modal-hint">Paste your save data, then choose which slot to import into.</p>
             <textarea id="import-data" placeholder="Paste your save data here..."></textarea>
+            <div class="import-slot-selector">
+                <span class="import-slot-label">Import into slot:</span>
+                <button class="slot-btn" data-import-slot="0">1</button>
+                <button class="slot-btn" data-import-slot="1">2</button>
+                <button class="slot-btn" data-import-slot="2">3</button>
+            </div>
             <div class="modal-buttons">
                 <button id="confirm-import">Import</button>
                 <button id="cancel-import">Cancel</button>

js/game.js

@@ -20,6 +20,10 @@ const Game = {
         totalPrestigeEssence: 0,
         prestigeUpgrades: [],
 
+        // Save Slot System
+        activeSlot: 0,   // index of the currently selected save slot (0..SLOTS-1)
+        autoSave: true,  // whether the periodic autosave loop is running
+
         // Golden Starbloom random event state
         goldenBlooms: {
             active: false,      // is a bloom currently visible on screen?
@@ -34,6 +38,10 @@ const Game = {
         tickRate: 100, // ms per tick (10 ticks/sec)
         autoSaveInterval: 30000, // 30 seconds
         costScaling: 1.15, // Cost multiplier per building level
+
+        // Save Slot System - number of independent save slots available
+        SLOTS: 3,
+
         goldenBloomMinMs: 45000, // min ms between bloom spawns (45s)
         goldenBloomMaxMs: 90000, // max ms between bloom spawns (90s)
         goldenBloomDuration: 12, // seconds a visible bloom stays before vanishing
@@ -59,6 +67,9 @@ const Game = {
      * Setup event listeners
      */
     setupEventListeners() {
+        // Track which slot the user has selected for importing.
+        this.importSlot = 0;
+
         // Harvest button - support both click and touch
         const harvestBtn = document.getElementById('harvest-btn');
 
@@ -100,9 +111,12 @@ const Game = {
         document.getElementById('confirm-import').addEventListener('click', () => {
             const data = document.getElementById('import-data').value;
             if (data) {
-                this.loadFromData(data);
+                const ok = this.importSlotFromData(data, this.importSlot);
                 UI.hideImportModal();
-                UI.showNotification('Save imported!', 'success');
+                if (ok) {
+                    // If the import landed in the active slot, switchSlot already re-rendered.
+                    UI.update();
+                }
             }
         });
 
@@ -116,6 +130,37 @@ const Game = {
             }
         });
 
+        // Save Slot System: slot selection buttons.
+        document.querySelectorAll('.slot-btn').forEach(btn => {
+            btn.addEventListener('click', () => {
+                if (this.state.activeSlot === parseInt(btn.dataset.slot, 10)) {
+                    UI.showNotification(`Already on Slot ${parseInt(btn.dataset.slot, 10) + 1}`, 'info');
+                    return;
+                }
+                if (confirm(`Switch to Slot ${parseInt(btn.dataset.slot, 10) + 1}?\nUnsaved changes will be saved first.`)) {
+                    this.save(); // Persist current slot before switching.
+                    this.switchSlot(parseInt(btn.dataset.slot, 10));
+                }
+            });
+        });
+
+        // Autosave toggle button.
+        document.getElementById('autosave-btn').addEventListener('click', () => {
+            this.state.autoSave = !this.state.autoSave;
+            const btn = document.getElementById('autosave-btn');
+            if (this.state.autoSave) {
+                btn.classList.add('on');
+                btn.textContent = 'ON';
+                UI.showNotification('Autosave enabled', 'success');
+            } else {
+                btn.classList.remove('on');
+                btn.textContent = 'OFF';
+                UI.showNotification('Autosave disabled', 'info');
+            }
+            // Persist the toggle preference immediately.
+            localStorage.setItem('cosmicGardenAutoSave', String(this.state.autoSave));
+        });
+
         // Tab switching
         document.querySelectorAll('.tab-btn').forEach(btn => {
             btn.addEventListener('click', (e) => {
@@ -126,6 +171,14 @@ const Game = {
                 document.getElementById(`${tab}-tab`).classList.add('active');
             });
         });
+
+        // Import slot selector buttons.
+        document.querySelectorAll('[data-import-slot]').forEach(btn => {
+            btn.addEventListener('click', () => {
+                this.importSlot = parseInt(btn.dataset.importSlot, 10);
+                UI.showNotification(`Importing into Slot ${this.importSlot + 1}`, 'info');
+            });
+        });
     },
 
     /**
@@ -480,6 +533,8 @@ const Game = {
      */
     startAutoSave() {
         setInterval(() => {
+            // Only autosave when the player has enabled it (default on).
+            if (!this.state.autoSave) return;
             this.save();
             document.getElementById('last-saved').textContent = 
                 `Last saved: ${new Date().toLocaleTimeString()}`;
@@ -487,22 +542,46 @@ const Game = {
     },
 
     /**
-     * Save game state
+     * localStorage key for a given slot's save data.
+     */
+    getSaveKey(slot) {
+        return `cosmicGardenSave-${slot}`;
+    },
+
+    /**
+     * The key holding the selected slot index across page loads.
+     */
+    getActiveSlotKey() {
+        return 'cosmicGardenActiveSlot';
+    },
+
+    /**
+     * Save game state to the currently active slot.
      */
     save() {
         this.state.lastSaveTime = Date.now();
-        localStorage.setItem('cosmicGardenSave', JSON.stringify(this.state));
+        localStorage.setItem(this.getSaveKey(this.state.activeSlot), JSON.stringify(this.state));
     },
 
     /**
      * Load game state
      */
     loadState() {
-        const saved = localStorage.getItem('cosmicGardenSave');
+        // Restore the persisted selected-slot index before reading its data.
+        const persistedSlot = localStorage.getItem(this.getActiveSlotKey());
+        if (persistedSlot !== null) {
+            this.state.activeSlot = parseInt(persistedSlot, 10) || 0;
+        }
+
+        const saved = localStorage.getItem(this.getSaveKey(this.state.activeSlot));
         if (saved) {
             try {
                 const parsed = JSON.parse(saved);
                 this.state = { ...this.state, ...parsed };
+                // The explicitly-persisted slot selection always wins.
+                if (persistedSlot !== null) {
+                    this.state.activeSlot = parseInt(persistedSlot, 10) || 0;
+                }
                 
                 // Calculate offline progress
                 const offlineTime = (Date.now() - this.state.lastSaveTime) / 1000;
@@ -543,6 +622,117 @@ const Game = {
         }
     },
 
+    /**
+     * Load the data stored in a specific slot index (without changing it).
+     * Returns the parsed state, or null if that slot is empty.
+     */
+    loadSlot(slot) {
+        const raw = localStorage.getItem(this.getSaveKey(slot));
+        if (!raw) return null;
+        try {
+            return JSON.parse(raw);
+        } catch (e) {
+            console.error(`Failed to read slot ${slot}:`, e);
+            return null;
+        }
+    },
+
+    /**
+     * Switch the active save slot. Persists the selection and reloads that
+     * slot's data from localStorage into the live game state, preserving
+     * prestige-related counters that should carry across slots only when
+     * present in the target slot.
+     */
+    switchSlot(slot) {
+        slot = ((parseInt(slot, 10) || 0) + this.config.SLOTS) % this.config.SLOTS;
+
+        // Persist the selection first so loadState() reads it back.
+        localStorage.setItem(this.getActiveSlotKey(), String(slot));
+        this.state.activeSlot = slot;
+
+        const data = this.loadSlot(slot);
+        if (data) {
+            try {
+                const parsed = JSON.parse(JSON.stringify(data));
+                this.state = { ...this.state, ...parsed };
+                // Ensure the slot index stays consistent.
+                this.state.activeSlot = slot;
+
+                UI.showNotification(
+                    `Saved to Slot ${slot + 1}!`, 'success'
+                );
+            } catch (e) {
+                console.error('Failed to load selected slot:', e);
+                UI.showNotification('Could not load that slot!', 'warning');
+            }
+        } else {
+            // Target slot is empty: reset to a fresh start but keep essence.
+            this.state = {
+                stardust: 0,
+                totalStardust: 0,
+                totalClicks: 0,
+                clickPower: 1,
+                startTime: Date.now(),
+                lastSaveTime: Date.now(),
+                buildings: {},
+                upgrades: [],
+                achievements: [],
+                stellarEssence: this.state.stellarEssence || 0,
+                prestigeCount: this.state.prestigeCount || 0,
+                totalPrestigeEssence: this.state.totalPrestigeEssence || 0,
+                prestigeUpgrades: this.state.prestigeUpgrades || [],
+                goldenBlooms: { active: false, timer: 0, lastSpawn: Date.now(), totalClaimed: 0 },
+                activeSlot: slot,
+                autoSave: this.state.autoSave
+            };
+            UI.showNotification(
+                `Empty Slot ${slot + 1} - new game started!`, 'success'
+            );
+        }
+
+        // Re-render dynamic UI and refresh the golden-bloom badge.
+        UI.init();
+        UI.update();
+    },
+
+    /**
+     * Export a single slot's save as base64 (for backup or transfer).
+     */
+    exportSlotToBase64(slot) {
+        const data = this.loadSlot(slot);
+        if (!data) {
+            UI.showNotification(`Slot ${slot + 1} is empty!`, 'warning');
+            return null;
+        }
+        const encoded = btoa(JSON.stringify(data));
+        navigator.clipboard.writeText(encoded).then(() => {
+            UI.showNotification(`Slot ${slot + 1} copied to clipboard!`, 'success');
+        });
+        return encoded;
+    },
+
+    /**
+     * Import base64 save data into a chosen slot.
+     */
+    importSlotFromData(data, slot) {
+        try {
+            const parsed = JSON.parse(atob(data));
+            localStorage.setItem(this.getSaveKey(slot), JSON.stringify(parsed));
+            UI.showNotification(`Imported into Slot ${slot + 1}!`, 'success');
+
+            // If we imported into the active slot, reload it.
+            if (parseInt(slot, 10) === this.state.activeSlot) {
+                this.switchSlot(slot);
+            } else {
+                UI.update();
+            }
+            return true;
+        } catch (e) {
+            UI.showNotification('Invalid save data!', 'warning');
+            return false;
+        }
+    },
+
     /**
      * Export save as base64
      */
@@ -572,7 +762,10 @@ const Game = {
             stellarEssence: 0,
             prestigeCount: 0,
             totalPrestigeEssence: 0,
-            prestigeUpgrades: []
+            prestigeUpgrades: [],
+            goldenBlooms: { active: false, timer: 0, lastSpawn: Date.now(), totalClaimed: 0 },
+            activeSlot: this.state.activeSlot,
+            autoSave: this.state.autoSave
         };
         UI.update();
         UI.showNotification('Game reset!', 'warning');

js/stats.js

@@ -75,6 +75,16 @@ const Stats = {
                     <div class="stat-bar-fill" id="stat-progress-bar" style="width: 0%"></div>
                 </div>
             </div>
+
+            <!-- Save Slot System -->
+            <div class="stat-item">
+                <div class="stat-label">Active Save Slot</div>
+                <div class="stat-value" id="stat-active-slot">Slot 1 / ${Game.config.SLOTS}</div>
+            </div>
+            <div class="stat-item">
+                <div class="stat-label">Autosave</div>
+                <div class="stat-value" id="stat-autosave">ON</div>
+            </div>
         `;
     },
 
@@ -132,6 +142,20 @@ const Stats = {
             achievementsEl.textContent = `${Achievements.getCount()}/${Achievements.getTotal()}`;
         }
 
+        // Active save slot display
+        const activeSlotEl = document.getElementById('stat-active-slot');
+        if (activeSlotEl) {
+            const idx = Game.state.activeSlot || 0;
+            activeSlotEl.textContent = `Slot ${idx + 1} / ${Game.config.SLOTS}`;
+        }
+
+        // Autosave status display
+        const autosaveEl = document.getElementById('stat-autosave');
+        if (autosaveEl) {
+            autosaveEl.textContent = Game.state.autoSave ? 'ON' : 'OFF';
+            autosaveEl.style.color = Game.state.autoSave ? 'var(--accent-green)' : 'var(--text-muted)';
+        }
+
         // Total Golden Blooms claimed
         const goldenBloomsEl = document.getElementById('stat-golden-blooms');
         if (goldenBloomsEl) {

js/ui.js

@@ -11,6 +11,7 @@ const UI = {
         this.renderBuildings();
         this.renderUpgrades();
         this.renderAchievements();
+        this.updateSlotUI();
         this.update();
     },
 
@@ -41,6 +42,9 @@ const UI = {
         
         // Golden Starbloom countdown badge
         this.updateGoldenBloomBadge();
+
+        // Save Slot System highlight / toggle state
+        this.updateSlotUI();
     },
 
     /**
@@ -297,6 +301,30 @@ const UI = {
         }
     },
 
+    /**
+     * Reflect the active save slot highlight and autosave toggle state.
+     */
+    updateSlotUI() {
+        // Highlight the selected slot button.
+        document.querySelectorAll('.slot-btn').forEach(btn => {
+            const idx = parseInt(btn.dataset.slot, 10);
+            btn.classList.toggle('active', idx === Game.state.activeSlot);
+            btn.disabled = idx === Game.state.activeSlot;
+        });
+
+        // Reflect the autosave toggle state.
+        const autosaveBtn = document.getElementById('autosave-btn');
+        if (autosaveBtn) {
+            if (Game.state.autoSave) {
+                autosaveBtn.classList.add('on');
+                autosaveBtn.textContent = 'ON';
+            } else {
+                autosaveBtn.classList.remove('on');
+                autosaveBtn.textContent = 'OFF';
+            }
+        }
+    },
+
     /**
      * Show floating text animation
      */