Refactor z-index values and optimize CSS properties for various seasonal styles; enhance performance with will-change property [skip ci]

Jellyfin.Plugin.Seasonals/Web/birthday.css

@@ -5,7 +5,7 @@
     width: 100vw;
     height: 100vh;
     pointer-events: none;
-    z-index: 9999;
+    z-index: 10;
     overflow: hidden;
     contain: strict;
     contain: layout paint;

Jellyfin.Plugin.Seasonals/Web/halloween.css

@@ -7,7 +7,7 @@
     width: 100%;
     height: 100%;
     pointer-events: none;
-    z-index: 10000;
+    z-index: 10;
     contain: layout paint;
 }
 

Jellyfin.Plugin.Seasonals/Web/oscar.css

@@ -6,7 +6,7 @@
     width: 100%;
     height: 100%;
     pointer-events: none;
-    z-index: 10; /* Behind popups but over background */
+    z-index: 10;
     contain: strict;
     overflow: hidden;
 }
@@ -30,8 +30,9 @@
 }
 
 .oscar-spotlight {
+    will-change: transform;
     position: absolute;
-    top: -10vh;
+    top: 0;
     /* MARK: SPOTLIGHT WIDTH CONFIGURATION */
     /* To adjust bottom width (spread), change 'width' property (e.g., 20vw for narrow, 40vw for wide). */
     /* To adjust top width (origin), modify first two percentages in 'clip-path' (e.g., 48% 0, 52% 0 for a very thin start). */
@@ -42,9 +43,11 @@
     transform-origin: top center;
     animation: spotlight-sweep 12s infinite alternate ease-in-out;
     mix-blend-mode: screen;
+     translate: 0 -10vh;
 }
 
 .oscar-flash {
+    will-change: transform;
     position: absolute;
     width: 10px;
     height: 10px;

Jellyfin.Plugin.Seasonals/Web/resurrection.css

@@ -16,9 +16,7 @@
     z-index: 15;
     top: 0;
     translate: 0 -15vh;
-    user-select: none;
+    user-select: none;
-    -webkit-user-select: none;
-    cursor: default;
     cursor: default;
     animation-name: resurrection-fall;
     animation-timing-function: linear;

Jellyfin.Plugin.Seasonals/Web/snowflakes.css

@@ -21,40 +21,13 @@
   color: #fff;
   font-family: Arial, sans-serif;
   text-shadow: 0 0 5px #000;
-  user-select: none;
+  user-select: none;
-  -webkit-user-select: none;
-  cursor: default;
-  -webkit-animation-name: heart-fall, heart-shake;
-  -webkit-animation-duration: 12s, 3s;
-  -webkit-animation-timing-function: linear, ease-in-out;
-  -webkit-animation-iteration-count: infinite, infinite;
-  animation-name: snowflakes-fall, snowflakes-shake;
   cursor: default;
   animation-name: snowflakes-fall, snowflakes-shake;
   animation-duration: 12s, 3s;
   animation-timing-function: linear, ease-in-out;
   animation-iteration-count: infinite, infinite;
-@-webkit-keyframes snowflakes-fall {
-  0% {
-    translate: 0 -10vh;
-  }
 }
-  100% {
-    translate: 0 110vh;
-  }
-}
-
-@-webkit-keyframes snowflakes-shake {
-
-  0%,
-  100% {
-    transform: translateX(0);
-  }
-
-  50% {
-    transform: translateX(80px);
-  }
-}
 
 
 

Jellyfin.Plugin.Seasonals/Web/space.css

@@ -5,12 +5,13 @@
     width: 100vw;
     height: 100vh;
     pointer-events: none;
-    z-index: 9999;
+    z-index: 10;
     overflow: hidden;
     contain: strict;
 }
 
 .space-bg-glow {
+    will-change: transform;
     position: absolute;
     top: 0; left: 0; width: 100vw; height: 100vh;
     background: radial-gradient(circle at 70% 30%, rgba(138, 43, 226, 0.15), transparent 60%),
@@ -33,6 +34,7 @@
 }
 
 .space-shooting-star {
+    will-change: opacity;
     position: absolute;
     width: 250px;
     height: 3px;
@@ -61,11 +63,11 @@
 }
 
 .space-symbol img {
+    will-change: transform;
     width: 6vh;
     height: auto;
     max-width: 60px;
     object-fit: contain;
-    /* Add a slow spin to images */
     animation: space-slow-spin var(--rot-dur, 20s) linear infinite;
 }
 

Jellyfin.Plugin.Seasonals/Web/spooky.css

@@ -8,6 +8,7 @@
     height: 100%;
     pointer-events: none;
     z-index: 10;
+    contain: layout paint;
 }
 
 .spooky {
@@ -16,19 +17,8 @@
     will-change: transform;
     translate: 0 120vh;
     z-index: 15;
-    -webkit-user-select: none;
-    -moz-user-select: none;
-    -ms-user-select: none;
     user-select: none;
-    -webkit-user-select: none;
     cursor: default;
-    
-    -webkit-animation-name: spooky-float;
-    -webkit-animation-duration: 10s;
-    -webkit-animation-timing-function: linear;
-    -webkit-animation-iteration-count: infinite;
-    -webkit-animation-play-state: running;
-    
     animation-name: spooky-float;
     animation-duration: 10s;
     animation-timing-function: linear;
@@ -40,13 +30,6 @@
     width: 30px;
     height: auto;
     will-change: transform;
-    
-    -webkit-animation-name: spooky-shake;
-    -webkit-animation-duration: 3s;
-    -webkit-animation-timing-function: ease-in-out;
-    -webkit-animation-iteration-count: infinite;
-    -webkit-animation-play-state: running;
-    
     animation-name: spooky-shake;
     animation-duration: 3s;
     animation-timing-function: ease-in-out;
@@ -59,22 +42,6 @@
     width: 100%;
 }
 
-@-webkit-keyframes spooky-float {
-    0% {
-        translate: 0 120vh;
-        opacity: 0;
-    }
-    10% {
-        opacity: 0.8;
-    }
-    90% {
-        opacity: 0.8;
-    }
-    100% {
-        translate: 0 -150px;
-        opacity: 0;
-    }
-}
 
 @keyframes spooky-float {
     0% {
@@ -93,14 +60,6 @@
     }
 }
 
-@-webkit-keyframes spooky-shake {
-    0%, 100% {
-        transform: translateX(0) scale(1) rotate(15deg);
-    }
-    50% {
-        transform: translateX(80px) scale(1.2) rotate(-15deg);
-    }
-}
 
 @keyframes spooky-shake {
     0%, 100% {
@@ -111,7 +70,6 @@
     }
 }
 
-/* Base predefined starting offsets (if not overridden by js) */
 .spooky:nth-of-type(0) { left: 1%; }
 .spooky:nth-of-type(1) { left: 10%; }
 .spooky:nth-of-type(2) { left: 20%; }

Jellyfin.Plugin.Seasonals/Web/sports.css

@@ -5,16 +5,17 @@
     width: 100vw;
     height: 100vh;
     pointer-events: none;
-    z-index: 9999;
+    z-index: 10;
     overflow: hidden;
     contain: strict;
 }
 
 .sports-symbol {
     position: absolute;
-    top: -10vh;
+    top: 0;
     opacity: 0.9;
     z-index: 40;
+    translate: 0 -10vh;
 }
 
 .sports-inner {
@@ -29,13 +30,15 @@
 }
 
 .sports-confetti {
+    will-change: transform, opacity;
     position: absolute;
-    top: -5vh;
+    top: 0;
     width: 10px;
     height: 15px;
     opacity: 0.8;
     animation: sports-confetti-fall linear infinite;
     border-radius: 2px;
+    translate: 0 -5vh;
 }
 
 .sports-confetti.circle {

Jellyfin.Plugin.Seasonals/Web/spring.css

@@ -29,13 +29,14 @@
 /* Sunbeams */
 .spring-sunbeam {
     position: fixed;
-    top: -50%;
+    top: 0;
     height: 200%;
     background: linear-gradient(to bottom, rgba(255, 255, 255, 0), rgba(255, 255, 200, 0.08) 50%, rgba(255, 255, 255, 0));
     z-index: 5; 
     transform-origin: top center;
     pointer-events: none;
     opacity: 0; 
+    translate: 0 -50vh;
 }
 
 /* Grass Container (Wrapper) */
@@ -72,6 +73,7 @@
 
 /* SVG Meadow Layer */
 .spring-meadow-layer {
+    will-change: transform;
     position: absolute;
     bottom: 0;
     left: 0;
@@ -94,6 +96,7 @@
 }
 
 .spring-sway {
+    will-change: transform;
     transform-origin: bottom center;
     animation: spring-meadow-sway 4s ease-in-out infinite alternate;
 }

Jellyfin.Plugin.Seasonals/Web/starwars.css

@@ -13,10 +13,11 @@
 
 .starwars-center {
     position: absolute;
-    top: 50%;
+    top: 0;
     left: 50%;
     width: 0;
     height: 0;
+    translate: 0 50vh;
 }
 
 .starwars-streak {

Jellyfin.Plugin.Seasonals/Web/underwater.css

@@ -35,6 +35,7 @@
 }
 
 .underwater-seaweed {
+    will-change: transform, opacity;
     position: absolute;
     bottom: -1vh;
     font-size: 4rem;
@@ -52,6 +53,7 @@
 }
 
 .underwater-bubble {
+    will-change: transform;
     position: absolute;
     bottom: -5vh;
     border-radius: 50%;
@@ -73,13 +75,13 @@
 }
 
 @keyframes underwater-traverse-up {
-    0% { top: 120vh; }
+    0% { top: 0;  translate: 0 120vh; }
-    100% { top: -20vh; }
+    100% { top: 0;  translate: 0 -20vh; }
 }
 
 @keyframes underwater-traverse-down {
-    0% { top: -20vh; }
+    0% { top: 0;  translate: 0 -20vh; }
-    100% { top: 120vh; }
+    100% { top: 0;  translate: 0 120vh; }
 }
 
 @keyframes underwater-sway-y {
@@ -101,8 +103,9 @@
 }
 
 .underwater-god-rays {
+    will-change: transform;
     position: absolute;
-    top: -50vh;
+    top: 0;
     left: -50vw;
     width: 200vw;
     height: 200vh;
@@ -119,6 +122,7 @@
     transform-origin: top center;
     mix-blend-mode: overlay;
     filter: blur(5px);
+    translate: 0 -50vh;
 }
 
 @keyframes god-rays-sway {