diff --git a/src/components/MembershipPage.tsx b/src/components/MembershipPage.tsx
index 09fb13d4..e8711ae5 100644
--- a/src/components/MembershipPage.tsx
+++ b/src/components/MembershipPage.tsx
@@ -88,7 +88,7 @@ export default function MembershipPage() {
           href="#join"
           onClick={handleJoinClick("secondary_cta")}
           data-membership-cta="true"
-          className="inline-flex min-h-[44px] items-center justify-center rounded-full bg-[#168039] px-6 py-3 font-semibold text-white shadow-sm transition-all duration-150 hover:bg-[#116b2f] hover:shadow-md active:bg-[#116b2f] active:shadow-sm focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#168039] focus-visible:ring-offset-2"
+          className="inline-flex min-h-[88px] items-center justify-center rounded-full bg-[#168039] px-12 py-6 text-2xl font-semibold text-white shadow-sm transition-all duration-150 hover:bg-[#116b2f] hover:shadow-md active:bg-[#116b2f] active:shadow-sm focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#168039] focus-visible:ring-offset-2"
         >
           Become a member
         </a>
diff --git a/src/components/TestimonialsMarquee.astro b/src/components/TestimonialsMarquee.astro
index 6e1f3f70..2347dd8a 100644
--- a/src/components/TestimonialsMarquee.astro
+++ b/src/components/TestimonialsMarquee.astro
@@ -13,18 +13,21 @@ interface Props {
   membershipLive?: boolean;
   heading?: string;
   subheading?: string;
+  background?: "default" | "green";
 }
 
 const {
   membershipLive = false,
   heading = "What it's like to work with T4P",
   subheading = "Project leaders, mentors, and members on their time inside the coalition.",
+  background = "default",
 } = Astro.props;
 
 const testimonials = getTestimonials(membershipLive);
+const sectionBgClass = background === "green" ? "border-green-100 bg-green-50" : "border-zinc-200 bg-zinc-50";
 ---
 
-<section class="border-t border-zinc-200 bg-zinc-50 py-16">
+<section class:list={["border-t py-16", sectionBgClass]}>
   <div class="mx-auto max-w-6xl px-6 sm:px-8">
     <h2 class="text-3xl font-extrabold tracking-tight text-zinc-900">{heading}</h2>
     <p class="mt-3 max-w-2xl text-lg text-zinc-600">{subheading}</p>
diff --git a/src/components/home/TestimonialsSection.astro b/src/components/home/TestimonialsSection.astro
index f7f4e259..f2daab16 100644
--- a/src/components/home/TestimonialsSection.astro
+++ b/src/components/home/TestimonialsSection.astro
@@ -10,6 +10,7 @@ interface Props {
   accent?: string;
   /** Right-hand supporting line, beside the heading on wide viewports. */
   subheading?: string;
+  background?: "default" | "green";
 }
 
 const {
@@ -18,12 +19,14 @@ const {
   heading = "What it's like to",
   accent = "work with T4P",
   subheading = "Project leaders, mentors, and members on their time inside the coalition.",
+  background = "default",
 } = Astro.props;
 
 const testimonials = getTestimonials(membershipLive);
+const sectionBgClass = background === "green" ? "bg-positive-tint" : "bg-page";
 ---
 
-<section class="bg-page pb-14 pt-14 min-[810px]:pb-20 min-[810px]:pt-20">
+<section class:list={[sectionBgClass, "pb-14 pt-14 min-[810px]:pb-20 min-[810px]:pt-20"]}>
   <div class="mx-auto max-w-[1400px] px-6 min-[810px]:px-10">
     <div
       class="testimonials-header mb-12 grid grid-cols-1 gap-6 min-[810px]:mb-16 min-[810px]:grid-cols-[1fr_1fr] min-[810px]:items-end"
diff --git a/src/components/membership/LegacyJoinSection.tsx b/src/components/membership/LegacyJoinSection.tsx
index 83133bce..4fa69b56 100644
--- a/src/components/membership/LegacyJoinSection.tsx
+++ b/src/components/membership/LegacyJoinSection.tsx
@@ -40,22 +40,18 @@ const NEXT_BUTTON_LOADING_MS = 400;
 
 /**
  * Payment surface for the legacy (green/grey) design system: the Qgiv embed
- * and the dues calculator A/B test.
+ * and the dues calculator.
  *
  * The design-system equivalent is `MembershipDues.tsx`. The two are kept apart
  * because `Layout.astro` does not load `design-system.css`, so the `ts-*`
  * typography scale the new component relies on is unavailable here.
  */
 export default function LegacyJoinSection({ tier, heading }: LegacyJoinSectionProps) {
-  const [showCalculator, setShowCalculator] = useState(false);
-  const [variant, setVariant] = useState<string | undefined>(undefined);
   const [step, setStep] = useState<"about-you" | "payment">("about-you");
   const [aboutYou, setAboutYou] = useState<AboutYouData | null>(null);
   const [revealed, setRevealed] = useState(false);
   const [advancingToPayment, setAdvancingToPayment] = useState(false);
 
-  const runsCalculatorTest = tier === "member";
-
   function handleAboutYouContinue(data: AboutYouData) {
     setAboutYou(data);
     setAdvancingToPayment(true);
@@ -74,40 +70,6 @@ export default function LegacyJoinSection({ tier, heading }: LegacyJoinSectionPr
     ? { ...splitName(aboutYou.name), email: aboutYou.email }
     : undefined;
 
-  useEffect(() => {
-    if (!runsCalculatorTest) return;
-
-    const urlParams = new URLSearchParams(window.location.search);
-    const urlParam = urlParams.get("calculator");
-
-    let assigned: boolean;
-    if (urlParam === "yes") {
-      assigned = true;
-    } else if (urlParam === "no") {
-      assigned = false;
-    } else {
-      const stored = localStorage.getItem("membership_ab_variant");
-      if (stored === "Calculator") {
-        assigned = true;
-      } else if (stored === "No Calculator") {
-        assigned = false;
-      } else {
-        assigned = Math.random() < 0.5;
-        localStorage.setItem("membership_ab_variant", assigned ? "Calculator" : "No Calculator");
-      }
-    }
-
-    const assignedVariant = assigned ? "Calculator" : "No Calculator";
-    setShowCalculator(assigned);
-    setVariant(assignedVariant);
-
-    if (typeof window.plausible !== "undefined") {
-      window.plausible("Membership Page", {
-        props: { membership_variant: assignedVariant },
-      });
-    }
-  }, [runsCalculatorTest]);
-
   useEffect(() => {
     // The CTA that dispatches "membership:reveal-join" may fire before this
     // island hydrates and registers its listener (e.g. the plain <a> CTAs on
@@ -129,17 +91,12 @@ export default function LegacyJoinSection({ tier, heading }: LegacyJoinSectionPr
     return () => window.removeEventListener("membership:reveal-join", handleReveal);
   }, []);
 
-  // The supporting tier always gets the calculator; the member tier only gets
-  // it in the "Calculator" A/B arm.
-  const calculatorVisible = step === "payment" && (tier === "supporting" || showCalculator);
+  const calculatorVisible = step === "payment";
 
-  const intro = calculatorVisible
-    ? tier === "supporting"
+  const intro =
+    tier === "supporting"
       ? "Contribute any amount for supporting membership dues. We suggest monthly dues equal to one hour's salary, which you can calculate below:"
-      : "Contribute any amount for membership dues. We suggest monthly dues equal to one hour's salary, which you can calculate below:"
-    : tier === "supporting"
-      ? "Contribute any amount for supporting membership dues. We suggest monthly dues equal to one hour's salary."
-      : "Contribute any amount for membership dues. We suggest monthly dues equal to one hour's salary.";
+      : "Contribute any amount for membership dues. We suggest monthly dues equal to one hour's salary, which you can calculate below:";
 
   return (
     <Box id="join" sx={{ scrollMarginTop: "80px" }}>
@@ -217,7 +174,7 @@ export default function LegacyJoinSection({ tier, heading }: LegacyJoinSectionPr
               </Box>
               {aboutYou && (
                 <Box sx={{ display: step === "payment" ? "block" : "none" }}>
-                  <QgivJoin tier={tier} variant={variant} prefill={prefill} />
+                  <QgivJoin tier={tier} prefill={prefill} />
                 </Box>
               )}
             </Box>
diff --git a/src/components/membership/MembershipDues.tsx b/src/components/membership/MembershipDues.tsx
index e5ed0b1e..21864766 100644
--- a/src/components/membership/MembershipDues.tsx
+++ b/src/components/membership/MembershipDues.tsx
@@ -35,17 +35,11 @@ const JOIN_PANEL_HEIGHT = 640;
 const NEXT_BUTTON_LOADING_MS = 400;
 
 export default function MembershipDues({ tier = "member" }: MembershipDuesProps) {
-  // Default to the no-calculator variant so this renders identically during
-  // SSR (no window/localStorage access) before the A/B assignment runs below.
-  const [showCalculator, setShowCalculator] = useState(false);
-  const [variant, setVariant] = useState<string | undefined>(undefined);
   const [step, setStep] = useState<"about-you" | "payment">("about-you");
   const [aboutYou, setAboutYou] = useState<AboutYouData | null>(null);
   const [revealed, setRevealed] = useState(false);
   const [advancingToPayment, setAdvancingToPayment] = useState(false);
 
-  const runsCalculatorTest = tier === "member";
-
   function handleAboutYouContinue(data: AboutYouData) {
     setAboutYou(data);
     setAdvancingToPayment(true);
@@ -64,40 +58,6 @@ export default function MembershipDues({ tier = "member" }: MembershipDuesProps)
     ? { ...splitName(aboutYou.name), email: aboutYou.email }
     : undefined;
 
-  useEffect(() => {
-    if (!runsCalculatorTest) return;
-
-    const urlParams = new URLSearchParams(window.location.search);
-    const urlParam = urlParams.get("calculator");
-
-    let assigned: boolean;
-    if (urlParam === "yes") {
-      assigned = true;
-    } else if (urlParam === "no") {
-      assigned = false;
-    } else {
-      const stored = localStorage.getItem("membership_ab_variant");
-      if (stored === "Calculator") {
-        assigned = true;
-      } else if (stored === "No Calculator") {
-        assigned = false;
-      } else {
-        assigned = Math.random() < 0.5;
-        localStorage.setItem("membership_ab_variant", assigned ? "Calculator" : "No Calculator");
-      }
-    }
-
-    const assignedVariant = assigned ? "Calculator" : "No Calculator";
-    setShowCalculator(assigned);
-    setVariant(assignedVariant);
-
-    if (typeof window.plausible !== "undefined") {
-      window.plausible("Membership Page", {
-        props: { membership_variant: assignedVariant },
-      });
-    }
-  }, [runsCalculatorTest]);
-
   useEffect(() => {
     // The CTA that dispatches "membership:reveal-join" may fire before this
     // island hydrates and registers its listener (e.g. plain <a> CTAs tracked
@@ -119,17 +79,12 @@ export default function MembershipDues({ tier = "member" }: MembershipDuesProps)
     return () => window.removeEventListener("membership:reveal-join", handleReveal);
   }, []);
 
-  // The supporting tier always gets the calculator; the member tier only gets
-  // it in the "Calculator" A/B arm.
-  const calculatorVisible = step === "payment" && (tier === "supporting" || showCalculator);
+  const calculatorVisible = step === "payment";
 
-  const intro = calculatorVisible
-    ? tier === "supporting"
+  const intro =
+    tier === "supporting"
       ? "Contribute any amount for supporting membership dues. We suggest monthly dues equal to one hour's salary, which you can calculate below:"
-      : "Contribute any amount for membership dues. We suggest monthly dues equal to one hour's salary, which you can calculate below:"
-    : tier === "supporting"
-      ? "Contribute any amount for supporting membership dues. We suggest monthly dues equal to one hour's salary."
-      : "Contribute any amount for membership dues. We suggest monthly dues equal to one hour's salary.";
+      : "Contribute any amount for membership dues. We suggest monthly dues equal to one hour's salary, which you can calculate below:";
 
   return (
     <div>
@@ -199,7 +154,7 @@ export default function MembershipDues({ tier = "member" }: MembershipDuesProps)
               </div>
               {aboutYou && (
                 <div style={{ display: step === "payment" ? "block" : "none" }}>
-                  <QgivJoin tier={tier} variant={variant} prefill={prefill} />
+                  <QgivJoin tier={tier} prefill={prefill} />
                 </div>
               )}
             </div>
diff --git a/src/components/membership/QgivJoin.tsx b/src/components/membership/QgivJoin.tsx
index 7298ed90..ccce72f7 100644
--- a/src/components/membership/QgivJoin.tsx
+++ b/src/components/membership/QgivJoin.tsx
@@ -22,11 +22,6 @@ function prefillKey(prefill?: QgivPrefill): string {
 
 interface QgivJoinProps {
   tier: MembershipTier;
-  /**
-   * Plausible prop recording which membership-page A/B variant the visitor saw.
-   * Only meaningful for the `member` tier.
-   */
-  variant?: string;
   className?: string;
   prefill?: QgivPrefill;
 }
@@ -46,7 +41,7 @@ interface QgivTransactionDetail {
  * embed and the listener — keeping them apart is what caused /membership-new to
  * silently stop sending Hub invites and EmailOctopus tags.
  */
-export default function QgivJoin({ tier, variant, className, prefill }: QgivJoinProps) {
+export default function QgivJoin({ tier, className, prefill }: QgivJoinProps) {
   const form = QGIV_FORMS[tier];
   const scriptLoadedRef = useRef(false);
   const containerRef = useRef<HTMLDivElement | null>(null);
@@ -183,7 +178,6 @@ export default function QgivJoin({ tier, variant, className, prefill }: QgivJoin
           props: {
             amount: transaction.total != null ? String(transaction.total) : "",
             membership_tier: tier,
-            ...(variant ? { membership_variant: variant } : {}),
           },
         });
       }
@@ -205,7 +199,7 @@ export default function QgivJoin({ tier, variant, className, prefill }: QgivJoin
 
     document.addEventListener("QGIV.donationComplete", handleDonationComplete);
     return () => document.removeEventListener("QGIV.donationComplete", handleDonationComplete);
-  }, [tier, variant]);
+  }, [tier]);
 
   // Safety net for a tier whose embed ID has been cleared: link out to the
   // hosted form so the page still converts, at the cost of losing completion
diff --git a/src/components/ui/Button.astro b/src/components/ui/Button.astro
index a6775c18..37917365 100644
--- a/src/components/ui/Button.astro
+++ b/src/components/ui/Button.astro
@@ -1,7 +1,7 @@
 ---
 interface Props {
   variant?: "primary" | "ghost" | "text";
-  size?: "md" | "lg";
+  size?: "md" | "lg" | "xl";
   href?: string;
   arrow?: boolean;
   class?: string;
@@ -22,6 +22,7 @@ const base =
 const sizes = {
   md: "px-5 py-3.5",
   lg: "px-10 py-5 min-[810px]:px-11",
+  xl: "btn-xl px-10 py-7 min-[810px]:px-14 min-[810px]:py-8",
 };
 
 const variants = {
@@ -41,8 +42,8 @@ const Tag = href ? "a" : "button";
   {
     arrow && (
       <svg
-        width="16"
-        height="16"
+        width={size === "xl" ? "32" : "16"}
+        height={size === "xl" ? "32" : "16"}
         viewBox="0 0 24 24"
         fill="none"
         stroke="currentColor"
@@ -54,3 +55,12 @@ const Tag = href ? "a" : "button";
     )
   }
 </Tag>
+
+<style>
+  /* Doubles the visual size of the "lg" primary CTA — bigger than the
+     shared ts-label scale allows without touching that scale's font-size
+     everywhere else it's used. */
+  .btn-xl {
+    font-size: 32px;
+  }
+</style>
diff --git a/src/pages/membership-new.astro b/src/pages/membership-new.astro
index 3f8501a9..2b62e1eb 100644
--- a/src/pages/membership-new.astro
+++ b/src/pages/membership-new.astro
@@ -135,7 +135,7 @@ const membershipLive = getEnv("MEMBERSHIP_LIVE", Astro.locals) === "true";
         <Button
           href="#join"
           variant="primary"
-          size="md"
+          size="xl"
           arrow
           data-track-join-click="secondary_cta"
           data-membership-cta="true"
@@ -145,7 +145,7 @@ const membershipLive = getEnv("MEMBERSHIP_LIVE", Astro.locals) === "true";
       </div>
     </section>
 
-    <TestimonialsSection membershipLive={membershipLive} />
+    <TestimonialsSection membershipLive={membershipLive} background="green" />
   </main>
 </HomeLayout>
 
diff --git a/src/pages/membership.astro b/src/pages/membership.astro
index ec5b05ea..ddf390e3 100644
--- a/src/pages/membership.astro
+++ b/src/pages/membership.astro
@@ -47,6 +47,6 @@ import "../styles/base.css";
       </div>
     </div>
 
-    <TestimonialsMarquee />
+    <TestimonialsMarquee background="green" />
   </main>
 </Layout>
diff --git a/src/pages/supporting-member-new.astro b/src/pages/supporting-member-new.astro
index ea319a42..a4212c6a 100644
--- a/src/pages/supporting-member-new.astro
+++ b/src/pages/supporting-member-new.astro
@@ -116,7 +116,7 @@ const membershipLive = getEnv("MEMBERSHIP_LIVE", Astro.locals) === "true";
         <Button
           href="#join"
           variant="primary"
-          size="md"
+          size="xl"
           arrow
           data-track-join-click="secondary_cta"
           data-membership-cta="true"
@@ -126,7 +126,12 @@ const membershipLive = getEnv("MEMBERSHIP_LIVE", Astro.locals) === "true";
       </div>
     </section>
 
-    <TestimonialsSection membershipLive={membershipLive} heading="Your support in" accent="action." />
+    <TestimonialsSection
+      membershipLive={membershipLive}
+      heading="Your support in"
+      accent="action."
+      background="green"
+    />
   </main>
 </HomeLayout>
 
diff --git a/src/pages/supporting-member.astro b/src/pages/supporting-member.astro
index be8c9c51..b2e89186 100644
--- a/src/pages/supporting-member.astro
+++ b/src/pages/supporting-member.astro
@@ -194,14 +194,14 @@ const logoWallLabel = `Projects supported by Tech for Palestine: ${showcaseProje
           href="#join"
           data-track-join-click="secondary_cta"
           data-membership-cta="true"
-          class="inline-flex min-h-[44px] items-center justify-center rounded-full bg-[#168039] px-6 py-3 font-semibold text-white shadow-sm transition-all duration-150 hover:bg-[#116b2f] hover:shadow-md active:bg-[#116b2f] active:shadow-sm focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#168039] focus-visible:ring-offset-2"
+          class="inline-flex min-h-[88px] items-center justify-center rounded-full bg-[#168039] px-12 py-6 text-2xl font-semibold text-white shadow-sm transition-all duration-150 hover:bg-[#116b2f] hover:shadow-md active:bg-[#116b2f] active:shadow-sm focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#168039] focus-visible:ring-offset-2"
         >
           Become a Supporting Member
         </a>
       </div>
     </div>
 
-    <TestimonialsMarquee heading="Your support in action." />
+    <TestimonialsMarquee heading="Your support in action." background="green" />
   </main>
 
   <script>