Add Platinum sponsor section for Mark III and NVIDIA

Added a new Platinum sponsor section for Mark III and NVIDIA with logos and descriptions.

Author: Carina6166

index.html

@@ -1933,6 +1933,35 @@ <h2 class="tier-title">Platinum Sponsors</h2>
                       </div>
                     </div>
                   </div>
+
+                    <!-- Platinum: Mark III / NVIDIA (same sponsor; names used interchangeably) -->
+                    <div class="platinum-slide markiii-nvidia">
+                      <div class="sponsor-card" style="text-align:left; max-width:480px; margin:0;">
+                        <div class="sponsor-badge" style="background-color:#D9D9D9;">Platinum</div>
+                    
+                        <!-- Dual logo block -->
+                        <div style="display:flex; flex-direction:column; gap:12px; align-items:center; margin-top:10px;">
+                          <!-- Mark III logo -->
+                          <a href="https://www.markiiisys.com/" target="_blank" rel="noopener" style="text-decoration:none; width:100%; display:block;">
+                            <img src="./markiii-color.png" alt="Mark III Systems Logo" style="width:80%; height:auto; display:block; margin:0 auto;">
+                          </a>
+                    
+                          <!-- NVIDIA logo -->
+                          <a href="https://www.nvidia.com/en-us/" target="_blank" rel="noopener" style="text-decoration:none; width:100%; display:block;">
+                            <img src="./NVLogo_V.JPG" alt="NVIDIA Logo" style="width:65%; height:auto; display:block; margin:0 auto;">
+                          </a>
+                        </div>
+                    
+                        <div class="sponsor-name" style="margin-top:1em;">Mark III / NVIDIA</div>
+                    
+                        <div class="sponsor-description">
+                          <p style="margin:0;">
+                            Mark III and NVIDIA are recognized as a single Platinum sponsor for TMC AI Summit 2026 (names used interchangeably).
+                          </p>
+                        </div>
+                      </div>
+                    </div>
+
 
                 </div>
               </div>