diff --git a/apps/web/cypress/e2e/cooking-session-page.cy.ts b/apps/web/cypress/e2e/cooking-session-page.cy.ts
index f3312c0..7001fd5 100644
--- a/apps/web/cypress/e2e/cooking-session-page.cy.ts
+++ b/apps/web/cypress/e2e/cooking-session-page.cy.ts
@@ -3,6 +3,8 @@
 // `GET /cooking-session` behavior (including the optimizer) against a real
 // database.
 
+import { PHONE_VIEWPORT } from "../support/viewports";
+
 const authenticatedProfile = {
   id: 1,
   firstName: "Alice",
@@ -421,3 +423,72 @@ describe("Cooking session page", () => {
     cy.contains("Impossible de charger").should("be.visible");
   });
 });
+
+// Ticket #89 — this page's first dedicated responsive pass (it previously
+// had no `@media` rule at all, see cooking-session-page.scss's own header
+// comment). No layout is restructured on phone (the flex-column shell and
+// the two horizontally-scrolling rows already degrade safely) — this covers
+// the two things that actually needed fixing: comfortable touch targets on
+// the screen's own controls, and a real flex overflow bug in the Recettes
+// tab (a long recipe name had no upper bound and could crowd its portions
+// badge/chevron out of the row).
+describe("Cooking session page (phone)", () => {
+  beforeEach(() => {
+    cy.setViewport("phone");
+    cy.clock(TODAY, ["Date"]);
+    cy.intercept("GET", "**/auth/me", { statusCode: 200, body: authenticatedProfile });
+  });
+
+  it("gives the task cards and stepper nodes a taller, more tappable padding than on desktop", () => {
+    cy.intercept("GET", /\/cooking-session\?/, { statusCode: 200, body: planFixture() });
+    cy.visit("/cuisiner?date=2026-08-17");
+
+    cy.get(".cooking-task")
+      .first()
+      .should(($el) => {
+        // --space-md (16px) on phone vs. the shared checkbox-label rule's
+        // own --space-xs (4px) app-wide default — see cooking-session-page
+        // .scss's phone block.
+        expect(getComputedStyle($el[0]).paddingTop).to.equal("16px");
+      });
+    cy.get(".cooking-stepper__node")
+      .first()
+      .should(($el) => {
+        expect(getComputedStyle($el[0]).paddingTop).to.equal("16px");
+      });
+
+    // The document itself never scrolls sideways, same global rule every
+    // other page is held to.
+    cy.document()
+      .its("documentElement.scrollWidth")
+      .should("be.lte", PHONE_VIEWPORT.width + 1);
+  });
+
+  it("truncates a long recipe name in the Recettes tab instead of pushing its portions badge out of view", () => {
+    const longName =
+      "Un très long nom de recette qui ne devrait surtout pas pousser le badge de portions hors de l'écran";
+    cy.intercept("GET", /\/cooking-session\?/, {
+      statusCode: 200,
+      body: {
+        startDate: "2026-08-17T00:00:00.000Z",
+        finishDate: "2026-08-23T00:00:00.000Z",
+        recipes: [{ recipeId: 1, name: longName, portions: 4 }],
+        phases: [],
+      },
+    });
+    cy.visit("/cuisiner?date=2026-08-17");
+    cy.contains(".cooking-session-page__tab", "Recettes").click();
+
+    cy.get(".cooking-recipes__name").should(($el) => {
+      const s = getComputedStyle($el[0]);
+      expect(s.textOverflow).to.equal("ellipsis");
+      expect(s.whiteSpace).to.equal("nowrap");
+      // The name's own box is clipped narrower than its full text — proof
+      // the truncation is actually engaged, not just declared.
+      expect($el[0].scrollWidth).to.be.greaterThan($el[0].clientWidth);
+    });
+    // ...and the badge survives, still on screen, not clipped away by the
+    // card's own `overflow: hidden`.
+    cy.contains(".cooking-recipes__portions", "4 portions").should("be.visible");
+  });
+});
diff --git a/apps/web/src/pages/cooking-session/cooking-session-page.scss b/apps/web/src/pages/cooking-session/cooking-session-page.scss
index 7aec442..0607f52 100644
--- a/apps/web/src/pages/cooking-session/cooking-session-page.scss
+++ b/apps/web/src/pages/cooking-session/cooking-session-page.scss
@@ -13,6 +13,8 @@
 // on the theme.
 // =============================================================================
 
+@use "../../styles/breakpoints" as bp;
+
 .cooking-session-page {
   height: 100%;
   display: flex;
@@ -134,12 +136,24 @@
     cursor: pointer;
   }
 
+  // `flex: 1; min-width: 0` + truncation — without it, a long recipe name
+  // has no upper bound in this flex row and can crowd the portions badge
+  // and chevron off to the side (or past the card's own `overflow: hidden`
+  // on `&__item`, silently clipping them) instead of the name itself
+  // truncating. Same fix as `.recipe-chip__name` (planning-page.scss) for
+  // the identical shape of bug.
   &__name {
+    flex: 1;
+    min-width: 0;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
     font-weight: 600;
     color: var(--color-text);
   }
 
   &__portions {
+    flex-shrink: 0;
     padding: 0.1rem var(--space-sm);
     border-radius: var(--radius-pill);
     background: var(--color-surface-alt);
@@ -486,3 +500,61 @@
     color: var(--color-text-muted);
   }
 }
+
+// --- Phone (issue #89, first responsive pass) -------------------------------
+// Nothing here reorganizes the layout — the flex-column shell and the two
+// horizontally-scrolling rows (`&__tabs`, `.cooking-stepper`, both the same
+// generic `overflow-x: auto` pattern used throughout the app) already
+// degrade safely on a narrow screen, and every text block wraps within its
+// own flex/block container (no fixed widths). What was actually missing:
+// comfortable touch targets on this screen's own controls — the task cards
+// especially, since ticking one off is THE primary, repeated, one-handed
+// action of the whole "Plan" tab. Same audit `planning-page.scss` got in
+// #88, applied here to this page's own elements.
+@include bp.phone {
+  // The task card is a shared "selectable card" checkbox label
+  // (global.scss's `label:has(> input[type="checkbox"])`, padding
+  // `--space-xs --space-sm` app-wide — fine with a mouse, too tight to tap
+  // reliably mid-cooking). `--space-md` all around clears Android's 48dp
+  // minimum touch target (this app is Android-only, see the root README)
+  // even in the worst case — a one-line headline with no utensils and no
+  // "Mutualisé" badge (~25px of text): 25 + 2×16 = 57px. Bumped here, not
+  // in the global rule: this page's task cards are the one place site-wide
+  // where quick, repeated tapping actually matters. Scoped under
+  // `.cooking-phase__tasks` (not a bare `.cooking-task` selector) for the
+  // same specificity reason as `&__tasks .cooking-task--done` above: a
+  // plain single class loses to `label:has(> input[type="checkbox"])`'s
+  // own specificity (a `:has()` argument counts its inner element +
+  // attribute), so it silently never applied without this.
+  .cooking-phase__tasks .cooking-task {
+    padding: var(--space-md);
+  }
+
+  // Same reasoning for the stepper's own nodes: the enlarged 1.75rem
+  // (28px) marker below is this node's tallest element, so `--space-md`
+  // padding puts its total height at 28 + 2×16 = 60px, comfortably past
+  // 48dp rather than landing exactly on it.
+  .cooking-stepper__node {
+    padding: var(--space-md);
+  }
+
+  .cooking-stepper__marker {
+    width: 1.75rem;
+    height: 1.75rem;
+  }
+
+  // Tab bar, Recettes summary row, Prev/Next — same treatment, so every
+  // tappable control on this page ends up consistently comfortable rather
+  // than fixing only the one most obviously broken.
+  .cooking-session-page__tab {
+    padding: var(--space-md);
+  }
+
+  .cooking-recipes__row {
+    padding: var(--space-md);
+  }
+
+  .cooking-plan__nav-btn {
+    padding: var(--space-md) var(--space-lg);
+  }
+}