Enhance WinnerCelebration visuals and confetti effects

Updated confetti burst and rain effects with brighter colors, improved motion, and increased visibility on dark overlays. Refined UI styling for better clarity, reduced dimensions for mobile-friendliness, and adjusted overlay opacity for enhanced contrast. Made layout and text updates for improved alignment and readability.

frontend/src/components/WinnerCelebration.jsx

@@ -18,31 +18,40 @@ export default function WinnerCelebration({ open, winnerName, onClose }) {
     if (!reduceMotion) {
       const end = Date.now() + 4500;
 
+      // WICHTIG: über dem Overlay rendern
+      const TOP_Z = 2147483647;
+
+      // hellere Farben damit’s auch auf dark overlay knallt
+      const bright = ["#ffffff", "#ffd166", "#06d6a0", "#4cc9f0", "#f72585"];
+
       // 2 große Bursts
       confetti({
-        particleCount: 150,
+        particleCount: 170,
         spread: 95,
-        startVelocity: 38,
+        startVelocity: 42,
         origin: { x: 0.12, y: 0.62 },
-        zIndex: 999999,
+        zIndex: TOP_Z,
+        colors: bright,
       });
       confetti({
-        particleCount: 150,
+        particleCount: 170,
         spread: 95,
-        startVelocity: 38,
+        startVelocity: 42,
         origin: { x: 0.88, y: 0.62 },
-        zIndex: 999999,
+        zIndex: TOP_Z,
+        colors: bright,
       });
 
       // “Rain” über die Zeit
       (function frame() {
         confetti({
-          particleCount: 6,
-          spread: 70,
-          startVelocity: 32,
+          particleCount: 8,
+          spread: 75,
+          startVelocity: 34,
           origin: { x: Math.random(), y: Math.random() * 0.18 },
-          scalar: 1.0,
-          zIndex: 999999,
+          scalar: 1.05,
+          zIndex: TOP_Z,
+          colors: bright,
         });
         if (Date.now() < end) requestAnimationFrame(frame);
       })();
@@ -73,24 +82,27 @@ export default function WinnerCelebration({ open, winnerName, onClose }) {
         position: "fixed",
         inset: 0,
         zIndex: 2147483646,
-        display: "grid",
-        placeItems: "center",
-        background: "rgba(0,0,0,0.58)",
+        display: "flex",
+        alignItems: "center",
+        justifyContent: "center",
+        // weniger dunkel -> Confetti wirkt heller
+        background: "rgba(0,0,0,0.42)",
         backdropFilter: "blur(10px)",
         WebkitBackdropFilter: "blur(10px)",
-        padding: 12,
+        padding: 14,
       }}
       onMouseDown={onClose}
     >
       <div
         onMouseDown={(e) => e.stopPropagation()}
         style={{
-          width: "min(560px, 92vw)",
-          borderRadius: 22,
-          padding: "16px 16px",
+          // kleiner + mobile friendly
+          width: "min(420px, 90vw)",
+          borderRadius: 18,
+          padding: "14px 14px",
           border: `1px solid ${stylesTokens.panelBorder}`,
           background: stylesTokens.panelBg,
-          boxShadow: "0 22px 90px rgba(0,0,0,0.60)",
+          boxShadow: "0 18px 70px rgba(0,0,0,0.55)",
           backdropFilter: "blur(10px)",
           WebkitBackdropFilter: "blur(10px)",
           position: "relative",
@@ -103,19 +115,19 @@ export default function WinnerCelebration({ open, winnerName, onClose }) {
             position: "absolute",
             inset: 0,
             background: `linear-gradient(90deg, transparent, ${stylesTokens.goldLine}, transparent)`,
-            opacity: 0.35,
+            opacity: 0.32,
             pointerEvents: "none",
           }}
         />
 
-        {/* kleine “shine” Ecke oben rechts */}
+        {/* shine */}
         <div
           style={{
             position: "absolute",
-            top: -80,
+            top: -70,
             right: -120,
-            width: 260,
-            height: 220,
+            width: 240,
+            height: 200,
             background: `radial-gradient(circle at 30% 30%, ${stylesTokens.goldLine}, transparent 60%)`,
             opacity: 0.12,
             transform: "rotate(12deg)",
@@ -123,15 +135,15 @@ export default function WinnerCelebration({ open, winnerName, onClose }) {
           }}
         />
 
-        <div style={{ position: "relative" }}>
-          <div style={{ fontSize: 34, lineHeight: 1 }}>🏆</div>
+        <div style={{ position: "relative", display: "grid", gap: 8 }}>
+          <div style={{ fontSize: 30, lineHeight: 1 }}>🏆</div>
 
           <div
             style={{
-              marginTop: 8,
-              fontSize: 18,
+              fontSize: 16,
               fontWeight: 900,
               color: stylesTokens.textMain,
+              lineHeight: 1.25,
             }}
           >
             Spieler{" "}
@@ -141,16 +153,16 @@ export default function WinnerCelebration({ open, winnerName, onClose }) {
             hat die richtige Lösung!
           </div>
 
-          <div style={{ marginTop: 8, color: stylesTokens.textDim, opacity: 0.95 }}>
+          <div style={{ color: stylesTokens.textDim, opacity: 0.95, fontSize: 13 }}>
             Fall gelöst. Respekt. ✨
           </div>
 
-          <div style={{ marginTop: 14, display: "flex", justifyContent: "flex-end" }}>
+          <div style={{ display: "flex", justifyContent: "flex-end", marginTop: 6 }}>
             <button
               onClick={onClose}
               style={{
-                padding: "10px 12px",
-                borderRadius: 14,
+                padding: "9px 11px",
+                borderRadius: 12,
                 border: `1px solid ${stylesTokens.panelBorder}`,
                 background: "rgba(255,255,255,0.06)",
                 color: stylesTokens.textMain,