diff --git a/projects/sunbird-quml-player-react/package.json b/projects/sunbird-quml-player-react/package.json
index 5c9b2f37..e6ae205c 100644
--- a/projects/sunbird-quml-player-react/package.json
+++ b/projects/sunbird-quml-player-react/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@project-sunbird/sunbird-quml-player-web-component-react",
   "private": true,
-  "version": "0.1.9",
+  "version": "0.1.10",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/projects/sunbird-quml-player-react/src/components/MainPlayer/MainPlayer.module.scss b/projects/sunbird-quml-player-react/src/components/MainPlayer/MainPlayer.module.scss
index a75cb91f..69915483 100644
--- a/projects/sunbird-quml-player-react/src/components/MainPlayer/MainPlayer.module.scss
+++ b/projects/sunbird-quml-player-react/src/components/MainPlayer/MainPlayer.module.scss
@@ -9,6 +9,24 @@
   height: 100%;
   width: 100%;
   max-width: 100%;
+  // Query container for the player's responsive rules (m.mobile / m.tablet).
+  // `inline-size` contains ONLY the inline (width) axis, so the height:100%
+  // chain — and the :host height:100% freeze fix — is untouched. Every
+  // responsive component is a descendant of this element, so they respond to
+  // the player's own available width instead of the browser viewport (needed
+  // for the editor's narrow mobile preview).
+  container-type: inline-size;
+  container-name: quml;
+  // Positioning context for the player's overlays. The overlays (submit modal,
+  // mobile sections drawer, feedback toast) are `position: absolute` and anchor
+  // to THIS box, so they stay within the player instead of covering the whole
+  // browser window when the player is embedded in a small frame (editor mobile
+  // preview). When the player fills the viewport (portal, real mobile,
+  // standalone) this box == the viewport, so it is visually identical to the
+  // previous `position: fixed` behavior. (container-type does not reliably
+  // establish a fixed-positioning containing block across browsers, so we rely
+  // on absolute positioning + this explicit relative anchor instead.)
+  position: relative;
   overflow-x: hidden; // hard guard: nothing scrolls the shell sideways
   // Overview / results / review render their screen directly in the shell (the
   // assessment stage scrolls via its inner .main). When the host constrains the
diff --git a/projects/sunbird-quml-player-react/src/components/MobileSectionsDrawer/MobileSectionsDrawer.module.scss b/projects/sunbird-quml-player-react/src/components/MobileSectionsDrawer/MobileSectionsDrawer.module.scss
index c6eeba7c..e2b08f70 100644
--- a/projects/sunbird-quml-player-react/src/components/MobileSectionsDrawer/MobileSectionsDrawer.module.scss
+++ b/projects/sunbird-quml-player-react/src/components/MobileSectionsDrawer/MobileSectionsDrawer.module.scss
@@ -2,8 +2,12 @@
 @use '../../styles/mixins' as m;
 
 // Mobile sections navigator — bottom sheet (matches the design's `sheetUp`).
+// `absolute` (anchored to MainPlayer's .appShell), not `fixed`, so the sheet
+// stays within the player box when embedded in a small frame (editor preview).
+// When the player fills the viewport (.appShell == viewport) it is identical to
+// fixed.
 .overlay {
-  position: fixed;
+  position: absolute;
   inset: 0;
   z-index: 1000;
   display: flex;
@@ -15,7 +19,11 @@
   display: flex;
   flex-direction: column;
   width: 100%;
-  max-height: 80vh;
+  // `%` (not `vh`) so the sheet height tracks the player box, not the browser
+  // viewport: in a short embedded frame it can't grow taller than .appShell.
+  // The overlay is absolute inset:0 (== .appShell height), so 80% == 80% of the
+  // player; identical to `80vh` when the player fills the viewport.
+  max-height: 80%;
   overflow-y: auto;
   -webkit-overflow-scrolling: touch;
   background: v.$ivory;
diff --git a/projects/sunbird-quml-player-react/src/components/SubmitModal/SubmitModal.module.scss b/projects/sunbird-quml-player-react/src/components/SubmitModal/SubmitModal.module.scss
index 6ce8e756..17bf6319 100644
--- a/projects/sunbird-quml-player-react/src/components/SubmitModal/SubmitModal.module.scss
+++ b/projects/sunbird-quml-player-react/src/components/SubmitModal/SubmitModal.module.scss
@@ -1,8 +1,12 @@
 @use '../../styles/variables' as v;
 @use '../../styles/mixins' as m;
 
+// `absolute` (anchored to MainPlayer's .appShell), not `fixed`, so the modal
+// stays within the player box when embedded in a small frame (editor preview).
+// When the player fills the viewport (.appShell == viewport) it is identical to
+// fixed.
 .overlay {
-  position: fixed;
+  position: absolute;
   inset: 0;
   z-index: 1200;
   display: flex;
diff --git a/projects/sunbird-quml-player-react/src/components/Toast/Toast.module.scss b/projects/sunbird-quml-player-react/src/components/Toast/Toast.module.scss
index b0db9b1f..5f055720 100644
--- a/projects/sunbird-quml-player-react/src/components/Toast/Toast.module.scss
+++ b/projects/sunbird-quml-player-react/src/components/Toast/Toast.module.scss
@@ -1,8 +1,12 @@
 @use '../../styles/variables' as v;
 @use '../../styles/mixins' as m;
 
+// `absolute` (anchored to MainPlayer's .appShell), not `fixed`, so the toast
+// stays within the player box when embedded in a small frame (editor preview).
+// When the player fills the viewport (.appShell == viewport) it is identical to
+// fixed.
 .viewport {
-  position: fixed;
+  position: absolute;
   bottom: v.$space-8;
   left: 50%;
   transform: translateX(-50%);
@@ -10,7 +14,10 @@
   display: flex;
   justify-content: center;
   width: max-content;
-  max-width: min(92vw, 36rem);
+  // `%` (not `vw`) so the cap tracks the player box, not the browser viewport:
+  // in a narrow embedded frame the toast stays within .appShell. Identical to
+  // `92vw` when the player fills the viewport (.appShell == viewport).
+  max-width: min(92%, 36rem);
   pointer-events: none;
 }
 
diff --git a/projects/sunbird-quml-player-react/src/styles/mixins.scss b/projects/sunbird-quml-player-react/src/styles/mixins.scss
index bbfc4ee0..03bf373b 100644
--- a/projects/sunbird-quml-player-react/src/styles/mixins.scss
+++ b/projects/sunbird-quml-player-react/src/styles/mixins.scss
@@ -10,8 +10,18 @@
 @use 'variables' as v;
 
 // Respond below the mobile breakpoint (≤768px).
+//
+// Uses a CONTAINER query (against the `quml` container declared on MainPlayer's
+// `.appShell`), NOT a viewport `@media`. The player is an embeddable web
+// component: hosts (e.g. the Sunbird editor's mobile preview) render it in a
+// narrow box while the browser viewport stays desktop-width, so viewport media
+// queries never fired and the layout overflowed. Querying the player's own
+// width makes it responsive to the space it's actually given.
+// When the player fills the viewport (portal, real mobile, standalone) the
+// container width == viewport width, so the breakpoints trigger identically to
+// before — no behavior change in those environments.
 @mixin mobile {
-  @media (max-width: v.$bp-mobile) {
+  @container quml (max-width: #{v.$bp-mobile}) {
     @content;
   }
 }
@@ -19,7 +29,7 @@
 // Respond at tablet and below (≤1023px). Combine with `mobile` (which is more
 // specific / placed after) for progressive collapse: tablet 2-up → mobile 1-up.
 @mixin tablet {
-  @media (max-width: v.$bp-tablet - 1px) {
+  @container quml (max-width: #{v.$bp-tablet - 1px}) {
     @content;
   }
 }
diff --git a/projects/sunbird-quml-player-react/src/utils/score.test.ts b/projects/sunbird-quml-player-react/src/utils/score.test.ts
index c3e0cbdf..c46daf46 100644
--- a/projects/sunbird-quml-player-react/src/utils/score.test.ts
+++ b/projects/sunbird-quml-player-react/src/utils/score.test.ts
@@ -89,7 +89,7 @@ describe('score utils (Angular evaluateAutoScored parity, normalized to 0..1)',
     expect(calculateMTFScore(q, { matches: { a: '1', b: '2' } })).toBe(1); // min(6,4)/4
   });
 
-  it('MTF legacy: proportional round(maxScore × hits/total)', () => {
+  it('MTF partial disabled (not MAP_RESPONSE): all-or-nothing', () => {
     const q = mk(
       {
         response1: {
@@ -100,8 +100,10 @@ describe('score utils (Angular evaluateAutoScored parity, normalized to 0..1)',
       },
       { maxScore: 10 },
     );
-    // 2 of 4 → round(10 × 0.5) = 5 → 0.5
-    expect(calculateMTFScore(q, { matches: { a: '1', b: '2', c: 'x', d: 'y' } })).toBe(0.5);
+    // 2 of 4 correct → no partial credit → 0.
+    expect(calculateMTFScore(q, { matches: { a: '1', b: '2', c: 'x', d: 'y' } })).toBe(0);
+    // All 4 correct → full marks → 1.
+    expect(calculateMTFScore(q, { matches: { a: '1', b: '2', c: '3', d: '4' } })).toBe(1);
   });
 
   // ── FTB (ftb) ────────────────────────────────────────────────────────────
@@ -150,7 +152,7 @@ describe('score utils (Angular evaluateAutoScored parity, normalized to 0..1)',
     expect(calculateFTBScore(q, { responses: { response1: 'red', response2: 'red' } })).toBe(0.5);
   });
 
-  it('FTB legacy: proportional round(maxScore × hits/total)', () => {
+  it('FTB partial disabled (not MAP_RESPONSE): all-or-nothing', () => {
     const q = mk(
       {
         response1: { cardinality: 'single', type: 'string', correctResponse: { value: 'cat' } },
@@ -158,8 +160,10 @@ describe('score utils (Angular evaluateAutoScored parity, normalized to 0..1)',
       },
       { maxScore: 4 },
     );
-    // 1 of 2 → round(4 × 0.5) = 2 → 0.5
-    expect(calculateFTBScore(q, { responses: { response1: 'cat', response2: 'fish' } })).toBe(0.5);
+    // 1 of 2 correct → no partial credit → 0.
+    expect(calculateFTBScore(q, { responses: { response1: 'cat', response2: 'fish' } })).toBe(0);
+    // Both correct → full marks → 1.
+    expect(calculateFTBScore(q, { responses: { response1: 'cat', response2: 'dog' } })).toBe(1);
     expect(calculateFTBScore(q, null)).toBe(0);
   });
 
diff --git a/projects/sunbird-quml-player-react/src/utils/score.ts b/projects/sunbird-quml-player-react/src/utils/score.ts
index e7890079..778dbe57 100644
Binary files a/projects/sunbird-quml-player-react/src/utils/score.ts and b/projects/sunbird-quml-player-react/src/utils/score.ts differ