diff --git a/src/pages/index.astro b/src/pages/index.astro
index 03994dc..c373d75 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -125,12 +125,26 @@ const canonical = new URL('/', Astro.site);
                       </span>
                       <span class="card-rule" aria-hidden="true"></span>
                     </a>
+
+                    <a
+                      id="technology-hydrangea"
+                      class="product-card product-card-next"
+                      data-technology-card
+                      href="https://hydrangea.blakeslee.xyz"
+                    >
+                      <span class="card-index">03 / Machine fabric</span>
+                      <span class="product-name">Hydrangea <span aria-hidden="true">↗</span></span>
+                      <span class="product-description">
+                        Not kept anywhere — alive everywhere, whole wherever you meet it.
+                      </span>
+                      <span class="card-rule" aria-hidden="true"></span>
+                    </a>
                   </div>
 
                   <div class="technology-index" role="status" aria-live="polite" aria-atomic="true">
                     <span class="technology-index-current" data-technology-progress-current>01</span>
                     <span aria-hidden="true">/</span>
-                    <span>02</span>
+                    <span>03</span>
                   </div>
                 </div>
               </div>
@@ -138,6 +152,7 @@ const canonical = new URL('/', Astro.site);
               <div class="technology-steps" aria-hidden="true">
                 <span data-technology-step="0"></span>
                 <span data-technology-step="1"></span>
+                <span data-technology-step="2"></span>
               </div>
             </div>
           </div>
@@ -510,9 +525,12 @@ const canonical = new URL('/', Astro.site);
     row-gap: clamp(2.75rem, 7vh, 6rem);
   }
 
+  /* Scroll length is per story beat, not a fixed page height: a card added to the
+     stack has to lengthen this or every beat gets shorter. Sized so three beats each
+     hold the stage for about as long as the two-card stack gave one. */
   .hero-lead.has-scroll-stack {
     position: relative;
-    min-height: clamp(54rem, 145svh, 84rem);
+    min-height: clamp(66rem, 178svh, 103rem);
     align-items: stretch;
   }
 
@@ -548,7 +566,8 @@ const canonical = new URL('/', Astro.site);
   .is-stacked-stack .technology-stack {
     width: min(100%, 28rem);
     min-width: 0;
-    min-height: 100svh;
+    /* Same per-beat rule as the two-column stack above, at this fallback's own pace. */
+    min-height: 130svh;
     margin-top: clamp(3.25rem, 9vh, 6rem);
     margin-left: auto;
   }
@@ -812,12 +831,26 @@ const canonical = new URL('/', Astro.site);
     position: absolute;
     inset: 0;
     display: none;
-    grid-template-rows: repeat(2, minmax(0, 1fr));
     pointer-events: none;
   }
 
+  /* Deliberately not equal shares. A step box is read against a band across the
+     middle of the viewport, and the stack's own top edge starts well below it, so
+     the opening box has to be the longest simply to reach that band — split evenly,
+     the first product would flick past in a third of the scroll the middle one gets.
+     Measured against the rendered page: these hold each product for within ~10% of
+     the same distance from 700px to 1100px tall. */
   .is-scroll-stack .technology-steps {
     display: grid;
+    grid-template-rows: 44% 19% 37%;
+  }
+
+  /* The wrapped fallback pins its card near the top of the viewport rather than at
+     the middle of a column, so the opening box reaches the band far sooner and needs
+     the smallest share here, not the largest. Declared after the rule above because
+     the two selectors weigh the same. */
+  .is-stacked-stack .technology-steps {
+    grid-template-rows: 20% 32% 48%;
   }
 
   .footer {
@@ -982,9 +1015,11 @@ const canonical = new URL('/', Astro.site);
     }
 
     /* Scroll length for the story, and nothing else — the card no longer spends any
-       of it travelling, so a full viewport of it would read as a dead stretch. */
+       of it travelling, so a full viewport of it would read as a dead stretch. Holds
+       the phone's pace from the two-card stack across three beats rather than making
+       the story a third longer again. */
     .has-scroll-stack .technology-stack {
-      min-height: 70svh;
+      min-height: 90svh;
     }
 
     /* The script pins this at the card's own resting offset. The clamp is the fallback
@@ -998,12 +1033,12 @@ const canonical = new URL('/', Astro.site);
       min-height: 11.9rem;
     }
 
-    /* Keep Nucleic alone for roughly the first half of the scroll, then move directly
-       into the next product without the old empty stretch between story beats. The
-       split is below half because the step boxes are read against a band at the middle
-       of the viewport, which the stack's own top edge starts well below. */
+    /* The same unequal split as the desktop stack, retuned: a phone's step boxes are
+       read against the same centre band, but the stack starts much further down its
+       own scroll, so the opening share is larger again. Measured across 640–932px
+       tall, these keep the three products within ~25% of one another. */
     .is-scroll-stack .technology-steps {
-      grid-template-rows: 23% 77%;
+      grid-template-rows: 29% 19% 52%;
     }
 
     /* One line each: side by side these two need ~360px of tracking-heavy mono, which
@@ -1235,10 +1270,14 @@ const canonical = new URL('/', Astro.site);
       }
     };
 
+    /* A card waits below the active one and leaves above it, so which side of the
+       composition a given card sits on depends on where the story currently is — the
+       markup class is only the resting state of the stack before any of this runs. */
     const activateTechnology = (index: number) => {
       cards.forEach((card, cardIndex) => {
         const isActive = cardIndex === index;
         card.classList.toggle('is-active', isActive);
+        card.classList.toggle('product-card-next', cardIndex > index);
         card.toggleAttribute('inert', !isActive);
         card.setAttribute('aria-hidden', String(!isActive));
       });