diff --git a/src/app/utils/rs-polyfill.util.spec.ts b/src/app/utils/rs-polyfill.util.spec.ts
index 829cad4a2..711c05680 100644
--- a/src/app/utils/rs-polyfill.util.spec.ts
+++ b/src/app/utils/rs-polyfill.util.spec.ts
@@ -1,6 +1,24 @@
 import { RsPolyfillUtil } from './rs-polyfill.util';
 
 describe('RsPolyfillUtil', () => {
+    it('adds an idempotent native SVG inversion filter for iOS night mode', () => {
+        const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
+        const addFilter = (RsPolyfillUtil as unknown as {
+            addNightModeImageFilter: (svg: SVGSVGElement) => void;
+        }).addNightModeImageFilter.bind(RsPolyfillUtil);
+
+        addFilter(svg);
+        addFilter(svg);
+
+        const filters = svg.querySelectorAll('#mekbay-night-image-invert');
+        expect(filters.length).toBe(1);
+        expect(filters[0].parentElement?.localName).toBe('defs');
+        expect(filters[0].getAttribute('color-interpolation-filters')).toBe('sRGB');
+        expect(filters[0].querySelector('feFuncR')?.getAttribute('tableValues')).toBe('1 0');
+        expect(filters[0].querySelector('feFuncG')?.getAttribute('tableValues')).toBe('1 0');
+        expect(filters[0].querySelector('feFuncB')?.getAttribute('tableValues')).toBe('1 0');
+    });
+
     it('injects fluff at outer root coordinates across a nested SVG viewport', () => {
         const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
         const parent = document.createElementNS('http://www.w3.org/2000/svg', 'g');
diff --git a/src/app/utils/rs-polyfill.util.ts b/src/app/utils/rs-polyfill.util.ts
index 1e71e6927..320833dd3 100644
--- a/src/app/utils/rs-polyfill.util.ts
+++ b/src/app/utils/rs-polyfill.util.ts
@@ -118,6 +118,7 @@ export class RsPolyfillUtil {
      */
     public static addMissingClasses(forceUnit: CBTForceUnit, svg: SVGSVGElement): void {
         const unit = forceUnit.getUnit();
+        this.addNightModeImageFilter(svg);
         if (unit.type !== 'Mek') {
             this.addCriticalLocs(svg);
         }
@@ -139,6 +140,33 @@ export class RsPolyfillUtil {
         this.addCriticalSectionsButtons(unit, svg)
     }
 
+    /** Adds a native SVG inversion filter for iOS WebKit, which ignores CSS invert() on SVG images. */
+    private static addNightModeImageFilter(svg: SVGSVGElement): void {
+        const filterId = 'mekbay-night-image-invert';
+        if (svg.getElementById(filterId)) return;
+
+        let defs = Array.from(svg.children)
+            .find(element => element.localName === 'defs') as SVGDefsElement | undefined;
+        if (!defs) {
+            defs = document.createElementNS('http://www.w3.org/2000/svg', 'defs');
+            svg.insertBefore(defs, svg.firstChild);
+        }
+
+        const filter = document.createElementNS('http://www.w3.org/2000/svg', 'filter');
+        filter.setAttribute('id', filterId);
+        filter.setAttribute('color-interpolation-filters', 'sRGB');
+
+        const componentTransfer = document.createElementNS('http://www.w3.org/2000/svg', 'feComponentTransfer');
+        for (const channel of ['R', 'G', 'B']) {
+            const fn = document.createElementNS('http://www.w3.org/2000/svg', `feFunc${channel}`);
+            fn.setAttribute('type', 'table');
+            fn.setAttribute('tableValues', '1 0');
+            componentTransfer.appendChild(fn);
+        }
+        filter.appendChild(componentTransfer);
+        defs.appendChild(filter);
+    }
+
     public static syncConditionButtons(forceUnit: CBTForceUnit, svg: SVGSVGElement): void {
         this.addConditionsButtons(forceUnit, svg);
     }
diff --git a/src/styles.scss b/src/styles.scss
index 48677b676..ececba7a0 100644
--- a/src/styles.scss
+++ b/src/styles.scss
@@ -2520,7 +2520,7 @@ hr.divider {
 
         image {
             transform: none;
-            filter: invert(1);
+            filter: url("#mekbay-night-image-invert");
         }
 
         #fluff-image-fo {