Add gray-scaling when guessing

src/styles.css

@@ -29,6 +29,42 @@ code {
   gap: 24px;
 }
 
+.app-header,
+.app-main {
+  transition: filter 0.25s ease, opacity 0.25s ease;
+}
+
+.app.suspended .app-header,
+.app.suspended .app-main {
+  filter: grayscale(1) brightness(0.55);
+  opacity: 0.75;
+}
+
+.guess-overlay {
+  position: fixed;
+  inset: 0;
+  display: grid;
+  place-items: center;
+  background: rgba(8, 12, 26, 0.35);
+  backdrop-filter: blur(2px) grayscale(0.15);
+  pointer-events: none;
+  z-index: 12;
+}
+
+.guess-overlay p {
+  margin: 0;
+  padding: 16px 24px;
+  border-radius: 14px;
+  border: 1px solid rgba(255, 255, 255, 0.3);
+  background: rgba(13, 17, 35, 0.88);
+  color: #ffffff;
+  font-family: 'Bebas Neue', sans-serif;
+  font-size: clamp(2.1rem, 4vw, 3.3rem);
+  letter-spacing: 0.07em;
+  text-transform: uppercase;
+  text-align: center;
+}
+
 .app-header {
   display: flex;
   justify-content: space-between;
@@ -554,16 +590,33 @@ audio.hidden-audio {
   color: rgba(255, 255, 255, 0.6);
 }
 
-.enable-audio {
+.viewer-actions {
   position: absolute;
+  left: 50%;
   bottom: 20px;
-  z-index: 3;
+  transform: translateX(-50%);
+  z-index: 4;
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.enable-audio {
+  border: 1px solid rgba(255, 255, 255, 0.4);
 }
 
 .viewer-guess {
-  position: absolute;
-  bottom: 20px;
-  z-index: 3;
+  font-size: 1rem;
+  font-weight: 800;
+  letter-spacing: 0.03em;
+  padding: 14px 28px;
+  background: linear-gradient(135deg, #ffce3a, #ff6a3a);
+  box-shadow: 0 12px 30px rgba(255, 106, 58, 0.35);
+}
+
+.viewer-guess:disabled {
+  background: linear-gradient(135deg, #8f8f8f, #666666);
+  box-shadow: none;
 }
 
 .end-panel {
@@ -606,4 +659,13 @@ audio.hidden-audio {
   .session-row {
     flex-wrap: wrap;
   }
+
+  .viewer-actions {
+    flex-direction: column;
+    width: calc(100% - 24px);
+  }
+
+  .viewer-actions .primary {
+    width: 100%;
+  }
 }