diff --git a/AGENTS.md b/AGENTS.md
index abd1342a..96a620fd 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -14,7 +14,7 @@ breaking changes with `!` or a `BREAKING CHANGE:` footer.
 
 <!-- BEGIN:nextjs-agent-rules -->
 
-# This is NOT the Next.js you know
+## This is NOT the Next.js you know
 
 This version has breaking changes — APIs, conventions, and file structure may all differ from your training data. Read the relevant guide in `node_modules/next/dist/docs/` (resolved from this file's directory; in monorepos the `next` package may not be visible from the repo root) before writing any code. Heed deprecation notices.
 
diff --git a/src/components/card-caption.tsx b/src/components/card-caption.tsx
index 70468f5c..62c63927 100644
--- a/src/components/card-caption.tsx
+++ b/src/components/card-caption.tsx
@@ -12,6 +12,7 @@ export function CardCaption({
   iconPosition = "right",
   image,
   href,
+  onClick,
   footer,
   className,
   titleClassName,
@@ -24,6 +25,7 @@ export function CardCaption({
   /** An image shown in place of the icon, e.g. a project's logo. */
   image?: string
   href?: string
+  onClick?: () => void
   /** Pinned to the bottom of the card, e.g. where a link leads to. */
   footer?: ReactNode
   className?: string
@@ -31,12 +33,18 @@ export function CardCaption({
   captionClassName?: string
 }) {
   return (
-    // Only cards that lead somewhere react to hover
     <Card
-      hoverBackground={Boolean(href)}
-      className={cn(href && "has-[>a:focus-visible]:ring-2 has-[>a:focus-visible]:ring-blue-secondary", className)}
+      hoverBackground={Boolean(href || onClick)}
+      className={cn(
+        (href || onClick) && "has-[:focus-visible]:ring-2 has-[:focus-visible]:ring-blue-secondary",
+        className
+      )}
     >
-      {href && <Link href={href} className="absolute inset-0 z-10 outline-none" aria-label={title} />}
+      {href ? (
+        <Link href={href} className="absolute inset-0 z-10 outline-none" aria-label={title} />
+      ) : onClick ? (
+        <button type="button" onClick={onClick} className="absolute inset-0 z-10 outline-none" aria-label={title} />
+      ) : null}
       <CardHeader
         className={`typo-headline-medium relative flex ${iconPosition === "right" ? "justify-between" : "flex-col-reverse"}`}
       >
diff --git a/src/components/card-icon/index.tsx b/src/components/card-icon/index.tsx
index 0a7fc50d..e111c318 100644
--- a/src/components/card-icon/index.tsx
+++ b/src/components/card-icon/index.tsx
@@ -9,10 +9,19 @@ import type { CardIconProps } from "./types"
 import { getAlignmentClasses, getCardPaddingClasses, getContentGapClasses, getTitleSizeClasses } from "./utils"
 
 export function CardIcon(props: CardIconProps) {
-  const { title, icon, size = "md", href, hoverEffect = Boolean(props.href), align = "center", className } = props
+  const {
+    title,
+    icon,
+    size = "md",
+    href,
+    onClick,
+    hoverEffect = Boolean(href || onClick),
+    align = "center",
+    className,
+  } = props
   const description = "description" in props ? props.description : undefined
   const cta = "cta" in props ? props.cta : undefined
-  const Root = href ? "a" : "div"
+  const Root = href ? "a" : onClick ? "button" : "div"
   const isDescriptionCard = Boolean(description)
   const isInlineAligned = align === "inline"
   const isCompactDescriptionCard = isDescriptionCard && size === "compact"
@@ -22,14 +31,17 @@ export function CardIcon(props: CardIconProps) {
     <Glass
       className={cn(
         "w-full overflow-hidden rounded-rectangles border-white/50 bg-background-blur p-0 text-card-foreground",
-        href && "has-[>a:focus-visible]:ring-2 has-[>a:focus-visible]:ring-blue-secondary",
+        (href || onClick) && "has-[:focus-visible]:ring-2 has-[:focus-visible]:ring-blue-secondary",
         className
       )}
     >
       <Root
         href={href}
+        type={onClick && !href ? "button" : undefined}
+        onClick={onClick}
+        aria-label={onClick && !href ? title : undefined}
         className={cn(
-          "group/card relative flex h-full flex-col text-left outline-none",
+          "group/card relative flex h-full w-full flex-col text-left outline-none",
           getCardPaddingClasses(size, isDescriptionCard)
         )}
       >
diff --git a/src/components/card-icon/types.ts b/src/components/card-icon/types.ts
index cdff14ae..4e4b6c2c 100644
--- a/src/components/card-icon/types.ts
+++ b/src/components/card-icon/types.ts
@@ -22,7 +22,9 @@ export type SharedCardProps = {
   size?: ResponsiveCardSize
   align?: CardAlign
   href?: string
-  /** Defaults to whether the card has an `href`: only cards that lead somewhere react to hover. */
+  /** An action card uses a native button instead of a link. */
+  onClick?: () => void
+  /** Defaults to whether the card has a link or an action. */
   hoverEffect?: boolean
   className?: string
 }
diff --git a/src/components/home/about-us.tsx b/src/components/home/about-us.tsx
index 14c55b45..ed0d496b 100644
--- a/src/components/home/about-us.tsx
+++ b/src/components/home/about-us.tsx
@@ -11,7 +11,7 @@ export function AboutUs() {
 
       <Button variant="primary" size="lg" asChild>
         <Link href="/about">
-          About us
+          Scopri di più
           <FiArrowUpRight />
         </Link>
       </Button>
diff --git a/src/components/home/materials.tsx b/src/components/home/materials.tsx
index 146f16d7..f62968dd 100644
--- a/src/components/home/materials.tsx
+++ b/src/components/home/materials.tsx
@@ -1,14 +1,17 @@
+"use client"
+
 import Link from "next/link"
 import { Fragment } from "react"
 import { FiArrowUpRight, FiBook, FiBookOpen, FiClipboard, FiFileText, FiUploadCloud } from "react-icons/fi"
 import { CardIcon } from "@/components/card-icon"
 import { MATERIALS_URL } from "@/components/header/constants"
 import { CONTAINER } from "@/components/layout/page"
+import { useActivationToast } from "@/components/ui/activation-toast"
 import { Button } from "@/components/ui/button"
 import { cn } from "@/lib/utils"
 import { CardCaption } from "../card-caption"
 
-// "Carica" has no destination yet, so it stays a plain card
+// Upload and per-type archive pages will be activated later.
 const featuredCards = [
   {
     title: "Carica",
@@ -25,7 +28,6 @@ const featuredCards = [
   },
 ]
 
-// What the archive holds. Not links: the archive has no per-type pages to open
 const archiveTypes = [
   { title: "Dispense", icon: FiBook },
   { title: "Esami", icon: FiFileText },
@@ -33,6 +35,7 @@ const archiveTypes = [
 ]
 
 export function Materials() {
+  const { showActivationToast, activationToast } = useActivationToast()
   return (
     <section
       className={cn(
@@ -71,6 +74,7 @@ export function Materials() {
                 caption={card.description}
                 icon={card.icon}
                 href={card.href}
+                onClick={card.href ? undefined : showActivationToast}
                 className="h-auto w-full p-6 xl:hidden"
               />
               <CardIcon
@@ -78,6 +82,7 @@ export function Materials() {
                 description={card.description}
                 icon={card.icon}
                 href={card.href}
+                onClick={card.href ? undefined : showActivationToast}
                 size="md"
                 className="hidden h-full xl:block"
               />
@@ -87,10 +92,17 @@ export function Materials() {
 
         <div className="grid grid-cols-3 gap-4 sm:gap-6">
           {archiveTypes.map((card) => (
-            <CardIcon key={card.title} {...card} size={{ base: "xs", sm: "sm" }} className="h-full" />
+            <CardIcon
+              key={card.title}
+              {...card}
+              onClick={showActivationToast}
+              size={{ base: "xs", sm: "sm" }}
+              className="h-full"
+            />
           ))}
         </div>
       </div>
+      {activationToast}
     </section>
   )
 }
diff --git a/src/components/ui/activation-toast.tsx b/src/components/ui/activation-toast.tsx
new file mode 100644
index 00000000..3ac5b8d6
--- /dev/null
+++ b/src/components/ui/activation-toast.tsx
@@ -0,0 +1,34 @@
+"use client"
+
+import { useEffect, useState } from "react"
+import { createPortal } from "react-dom"
+import { FiInfo } from "react-icons/fi"
+
+/** One short notice at a time; another click restarts its three-second timeout. */
+export function useActivationToast() {
+  const [announcement, setAnnouncement] = useState(0)
+
+  useEffect(() => {
+    if (!announcement) return
+    const timeout = window.setTimeout(() => setAnnouncement(0), 3000)
+    return () => window.clearTimeout(timeout)
+  }, [announcement])
+
+  return {
+    showActivationToast: () => setAnnouncement((current) => current + 1),
+    activationToast: announcement
+      ? createPortal(
+          <output
+            key={announcement}
+            aria-live="polite"
+            aria-atomic="true"
+            className="typo-body-medium pointer-events-none fixed right-4 bottom-4 z-100 flex max-w-[calc(100vw-2rem)] items-center gap-3 rounded-2xl border border-white/70 bg-background/95 px-5 py-4 text-text-primary shadow-lg backdrop-blur-md sm:right-6 sm:bottom-6"
+          >
+            <FiInfo aria-hidden className="size-5 shrink-0 text-blue-secondary" />
+            In attivazione
+          </output>,
+          document.body
+        )
+      : null,
+  }
+}