Landing: don't fetch the video until it's played; link to the full yantra explorer

index.html

@@ -37,11 +37,11 @@ a.card p{margin:0;color:var(--muted);font-size:12.5px}
     <h1>Two poles <i>of one sphere</i></h1>
   </header>
   <p class="lede">The Śrī Yantra turned inside out by circle inversion, then wrapped onto a ball by stereographic projection. On the sphere the inversion is just a flip, and the bindu and infinity are the two poles.</p>
-  <video id="v" controls playsinline preload="metadata" src="https://teahub.xyz/maths/videos/raw/commit/ec0bb56210abe087f4731777ffba8d1fa6bab3df/yantra-two-poles.mp4"></video>
+  <video id="v" controls playsinline preload="none" src="https://teahub.xyz/maths/videos/raw/commit/ec0bb56210abe087f4731777ffba8d1fa6bab3df/yantra-two-poles.mp4"></video>
   <div class="cards">
     <a class="card" href="sphere/">
       <h2>Explore it</h2>
-      <p>Spin the yantra and its inversion on the Riemann sphere, with the plane underneath. Slide the lift, compare stereographic with great circles, and switch the sphere off to see just the plane.</p>
+      <p>Spin the yantra and its inversion on the Riemann sphere, with the plane underneath. Slide the lift, compare stereographic with great circles, switch the sphere off to see just the plane, and add or remove the outer yantra (lotus rings and bhupura).</p>
       <span class="go">open explorer →</span>
     </a>
     <a class="card" href="overlay/">