Make download button more prominent with simplified text

Co-authored-by: seanieb <191516+seanieb@users.noreply.github.com>

Author: Copilot

index.html

@@ -151,7 +151,7 @@ <h2>Ready to Secure Your Mac?</h2>
                 <p>Get the panic button your Mac deserves.</p>
                 <p class="opensource-note">PanicLock is open source software.</p>
                 <div class="cta-buttons">
-                    <a href="https://github.com/paniclock/paniclock/releases/latest" class="btn btn-primary">Download Latest Release</a>
+                    <a href="https://github.com/paniclock/paniclock/releases/latest" class="btn btn-primary btn-large">Download PanicLock</a>
                     <a href="https://github.com/paniclock/paniclock" class="btn btn-secondary">View on GitHub</a>
                 </div>
             </div>

styles.css

@@ -105,6 +105,12 @@ nav {
     box-shadow: var(--shadow-lg);
 }
 
+.btn-large {
+    padding: 16px 40px;
+    font-size: 18px;
+    font-weight: 600;
+}
+
 .btn-secondary {
     background-color: rgba(255, 255, 255, 0.2);
     color: white;