diff --git a/_includes/stamina-diagram.html b/_includes/stamina-diagram.html
new file mode 100644
index 000000000..6c6fdbe57
--- /dev/null
+++ b/_includes/stamina-diagram.html
@@ -0,0 +1,83 @@
+{% comment %}
+  "What STAMINA works on" diagram for the STAMINA page (styles: stamina/css/plain-style.css).
+  Plain HTML + inline SVG: real text, scales cleanly, stacks on narrow screens.
+{% endcomment %}
+<figure class="stam-diagram">
+  <figcaption class="sr-only">The three research areas STAMINA brings together, and the disciplines its members come from.</figcaption>
+
+  <svg class="stam-venn" viewBox="0 0 550 524" role="img"
+       aria-label="Venn diagram: STAMINA sits where social interaction technologies, social simulations and modelling, and AI agents and safety overlap.">
+    <defs>
+      <clipPath id="stam-clip-tech"><circle cx="175" cy="175" r="155"/></clipPath>
+      <clipPath id="stam-clip-sim"><circle cx="375" cy="175" r="155"/></clipPath>
+    </defs>
+    <g class="stam-venn-lobes">
+      <circle cx="175" cy="175" r="155" class="stam-venn-tech"/>
+      <circle cx="375" cy="175" r="155" class="stam-venn-sim"/>
+      <circle cx="275" cy="349" r="155" class="stam-venn-ai"/>
+    </g>
+    <g clip-path="url(#stam-clip-tech)">
+      <g clip-path="url(#stam-clip-sim)">
+        <circle cx="275" cy="349" r="155" class="stam-venn-core-shape"/>
+      </g>
+    </g>
+    <text class="stam-venn-label stam-venn-label--tech" x="121" y="170">
+      <tspan x="121">Social interaction</tspan>
+      <tspan x="121" dy="23">technologies</tspan>
+    </text>
+    <text class="stam-venn-label stam-venn-label--sim" x="429" y="170">
+      <tspan x="429">Social simulations</tspan>
+      <tspan x="429" dy="23">&amp; modelling</tspan>
+    </text>
+    <text class="stam-venn-label stam-venn-label--ai" x="275" y="395">
+      <tspan x="275">AI agents &amp; safety</tspan>
+    </text>
+  </svg>
+
+
+  <div class="stam-flow">
+    <div class="stam-flow-end">
+      <svg class="stam-net" viewBox="0 0 120 80" role="img" aria-hidden="true" focusable="false">
+        <g stroke="currentColor" stroke-width="1.5" opacity="0.5">
+          <path d="M18 60 46 24M46 24 88 44M88 44 62 66M62 66 18 60M46 24 70 14M100 24 88 44"/>
+          <path d="M28 30 52 48" stroke-dasharray="4 4"/>
+          <path d="M70 14 104 60" stroke-dasharray="4 4"/>
+        </g>
+        <g fill="currentColor">
+          <circle cx="18" cy="60" r="4"/><circle cx="46" cy="24" r="5"/><circle cx="88" cy="44" r="4.5"/>
+          <circle cx="62" cy="66" r="3.5"/><circle cx="70" cy="14" r="3"/><circle cx="100" cy="24" r="3"/>
+          <circle cx="28" cy="30" r="2.5"/><circle cx="104" cy="60" r="2.5"/><circle cx="52" cy="48" r="2.5"/>
+        </g>
+      </svg>
+      <span>Epistemic &amp; social crises</span>
+    </div>
+
+    <svg class="stam-arrow" viewBox="0 0 64 24" role="img" aria-hidden="true" focusable="false">
+      <path d="M2 12h50M44 5l9 7-9 7" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
+    </svg>
+
+    <div class="stam-flow-end stam-flow-end--good">
+      <svg class="stam-net" viewBox="0 0 120 80" role="img" aria-hidden="true" focusable="false">
+        <g stroke="currentColor" stroke-width="1.5" opacity="0.6">
+          <path d="M60 40 26 22M60 40 94 22M60 40 26 58M60 40 94 58M60 40 60 10M60 40 60 70"/>
+          <path d="M26 22 60 10M60 10 94 22M26 58 60 70M60 70 94 58"/>
+        </g>
+        <g fill="currentColor">
+          <circle cx="26" cy="22" r="4"/><circle cx="94" cy="22" r="4"/><circle cx="26" cy="58" r="4"/>
+          <circle cx="94" cy="58" r="4"/><circle cx="60" cy="10" r="4"/><circle cx="60" cy="70" r="4"/>
+        </g>
+        <circle cx="60" cy="40" r="7" fill="currentColor"/>
+      </svg>
+      <span>Pro-social, pro-truth applications</span>
+    </div>
+  </div>
+
+  <p class="stam-fields">
+    <span class="stam-fields-label">Members come from</span>
+    <span class="stam-chip">Computer science</span>
+    <span class="stam-chip">Social sciences</span>
+    <span class="stam-chip">Psychology</span>
+    <span class="stam-chip">Policy</span>
+    <span class="stam-chip">Industry &amp; start-ups</span>
+  </p>
+</figure>
diff --git a/stamina/css/plain-style.css b/stamina/css/plain-style.css
index a6fd09581..9a863c9d5 100644
--- a/stamina/css/plain-style.css
+++ b/stamina/css/plain-style.css
@@ -99,3 +99,129 @@ font-size: 18pt;
     display: none;
   }
 }
+
+/* ============================================================
+   "What STAMINA works on" diagram (see _includes/stamina-diagram.html)
+   ============================================================ */
+
+.stam-diagram {
+  --stam-ink: #2f3e4e;
+  --stam-muted: #5c6b7a;
+  --stam-line: #dbe2e8;
+  --stam-tech: #3d7ea6;
+  --stam-sim: #2a9d8f;
+  --stam-ai: #b07d3f;
+  margin: 30px 0 10px;
+  color: var(--stam-ink);
+}
+
+/* crises -> applications */
+.stam-flow {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: center;
+  gap: 6px 18px;
+  margin-top: 22px;
+  padding-top: 18px;
+  border-top: 1px solid var(--stam-line);
+}
+
+.stam-flow-end {
+  flex: 0 1 190px;
+  text-align: center;
+  color: var(--stam-muted);
+}
+
+.stam-flow-end--good { color: var(--stam-sim); }
+
+.stam-net {
+  display: block;
+  width: 100%;
+  max-width: 128px;
+  height: auto;
+  margin: 0 auto 4px;
+}
+
+.stam-flow-end span {
+  display: block;
+  font-size: 14px;
+  font-weight: 600;
+  line-height: 1.35;
+}
+
+.stam-arrow {
+  width: 54px;
+  height: 22px;
+  flex: 0 0 auto;
+  color: var(--stam-line);
+}
+
+/* disciplines */
+.stam-fields {
+  margin: 18px 0 0;
+  text-align: center;
+  line-height: 2;
+}
+
+.stam-fields-label {
+  display: block;
+  margin-bottom: 4px;
+  font-size: 12px;
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+  color: var(--stam-muted);
+}
+
+.stam-chip {
+  display: inline-block;
+  margin: 0 2px;
+  padding: 2px 9px;
+  font-size: 12.5px;
+  background: #f1f4f7;
+  border: 1px solid var(--stam-line);
+  border-radius: 999px;
+  color: var(--stam-ink);
+  white-space: nowrap;
+}
+
+@media (max-width: 600px) {
+  .stam-arrow { transform: rotate(90deg); }
+  .stam-flow-end { flex-basis: 100%; }
+}
+
+/* Venn: the three areas and their overlap */
+.stam-venn {
+  display: block;
+  width: 100%;
+  max-width: 480px;
+  height: auto;
+  margin: 0 auto 22px;
+}
+
+.stam-venn-lobes circle {
+  mix-blend-mode: multiply;
+  fill-opacity: 0.26;
+  stroke-width: 1.8;
+}
+
+.stam-venn-tech { fill: var(--stam-tech); stroke: var(--stam-tech); }
+.stam-venn-sim  { fill: var(--stam-sim);  stroke: var(--stam-sim); }
+.stam-venn-ai   { fill: var(--stam-ai);   stroke: var(--stam-ai); }
+
+.stam-venn-label {
+  font-size: 18px;
+  font-weight: 600;
+  text-anchor: middle;
+}
+
+.stam-venn-label--tech { fill: var(--stam-tech); }
+.stam-venn-label--sim  { fill: var(--stam-sim); }
+.stam-venn-label--ai   { fill: var(--stam-ai); }
+
+.stam-venn-core-shape {
+  fill: #ffffff;
+  fill-opacity: 0.55;
+  stroke: none;
+}
+
diff --git a/stamina/index.html b/stamina/index.html
index 559c8523f..8b06dbb24 100644
--- a/stamina/index.html
+++ b/stamina/index.html
@@ -122,6 +122,8 @@ <h3 style="text-align:center">About STAMINA</h3>
             <p style="text-align:justify; font-size:16px; line-height:1.6;">
               Digital platforms and AI agents are increasingly shaping society. While these technologies contribute to epistemic and social crises, they may also help address them. Our goal is to build a research community focused on positive-outcome applications.
             </p>
+            {% include stamina-diagram.html %}
+
             <br>
             <div class="box">
               <p style="text-align:justify; font-size:16px; line-height:1.6;">