fix: modal overlay and game screen styling

- Move modal overlay CSS to global stylesheet for reliable overlay behavior
- Render GameCompletionModal outside main container for true overlay effect
- Refactor GameCompletionModal to use global overlay and local content styles
- Fix player score layout, color, and button styling on game detail screen
- Add global .modal and .modal.show classes to index.css
- Clean up CSS modules for modal content and responsive design

Fixes #<issue_number>

src/components/App.jsx

@@ -189,13 +189,13 @@ export default function App() {
           message={validation.message}
           onClose={closeValidation}
         />
-        <GameCompletionModal
-          open={completionModal.open}
-          game={completionModal.game}
-          onConfirm={handleConfirmCompletion}
-          onClose={() => setCompletionModal({ open: false, game: null })}
-        />
       </div>
+      <GameCompletionModal
+        open={completionModal.open}
+        game={completionModal.game}
+        onConfirm={handleConfirmCompletion}
+        onClose={() => setCompletionModal({ open: false, game: null })}
+      />
       <FullscreenToggle />
     </>
   );

src/components/GameCompletionModal.jsx

@@ -11,7 +11,7 @@ export default function GameCompletionModal({ open, game, onConfirm, onClose })
     ? `Unentschieden zwischen ${winners.join(' und ')}`
     : `${winners[0]} hat gewonnen!`;
   return (
-    <div className={styles['modal'] + ' ' + styles['show']} id="game-completion-modal">
+    <div id="game-completion-modal" className="modal show">
       <div className={styles['modal-content']}>
         <div className={styles['modal-header']}>
           <span className={styles['modal-title']}>Spiel beendet</span>

src/components/GameCompletionModal.module.css

@@ -2,26 +2,24 @@
     position: fixed;
     top: 0;
     left: 0;
-    width: 100%;
-    height: 100%;
-    background-color: rgba(0, 0, 0, 0.7);
-    z-index: 1000;
-    display: none;
+    width: 100vw;
+    height: 100vh;
+    background-color: rgba(0, 0, 0, 0.8);
+    z-index: 9999;
+    display: flex;
     justify-content: center;
     align-items: center;
 }
-#game-completion-modal.show {
-    display: flex;
-}
-#game-completion-modal .modal-content {
-    background-color: #2a2a2a;
-    padding: 30px;
-    border-radius: 10px;
-    width: 90%;
-    max-width: 500px;
+.modal-content {
+    background-color: #222;
+    padding: 32px 24px 24px 24px;
+    border-radius: 16px;
+    width: 90vw;
+    max-width: 480px;
+    box-shadow: 0 4px 32px rgba(0,0,0,0.7);
     position: relative;
     margin: auto;
-    transform: translateY(0);
+    transform: none;
 }
 .final-scores {
     margin: 20px 0;
@@ -30,56 +28,88 @@
     display: flex;
     justify-content: space-between;
     align-items: center;
-    padding: 20px;
-    margin-bottom: 10px;
+    padding: 18px 0;
+    margin-bottom: 8px;
     background: #333;
-    border-radius: 5px;
-    font-size: 24px;
+    border-radius: 8px;
+    font-size: 1.2rem;
+    color: #fff;
 }
 .final-score .player-name {
-    font-size: 24px;
+    font-size: 1.2rem;
     font-weight: bold;
-    color: white;
+    color: #fff;
 }
 .final-score .score {
-    font-size: 24px;
+    font-size: 1.2rem;
     font-weight: bold;
-    color: white;
+    color: #fff;
 }
 .winner-announcement {
     text-align: center;
-    margin: 20px 0;
-    padding: 20px;
-    background: #4CAF50;
-    border-radius: 5px;
+    margin: 20px 0 0 0;
+    padding: 18px 8px;
+    background: #43a047;
+    border-radius: 8px;
+    font-size: 1.2rem;
+    color: #fff;
+    font-weight: 700;
 }
 .winner-announcement h3 {
-    font-size: 24px;
+    font-size: 1.2rem;
     margin: 0;
-    color: white;
+    color: #fff;
 }
-.modal-buttons {
+.modal-footer {
     display: flex;
-    gap: 10px;
-    margin-top: 20px;
+    flex-direction: row;
+    gap: 16px;
+    margin-top: 24px;
+    width: 100%;
+    justify-content: center;
 }
-.modal-buttons .btn {
+.btn {
     flex: 1;
-    padding: 20px;
-    font-size: 20px;
+    padding: 18px 0;
+    font-size: 1.1rem;
     border: none;
-    border-radius: 0;
+    border-radius: 8px;
     cursor: pointer;
-    color: white;
+    color: #fff;
+    background: #333;
+    font-weight: 600;
+    transition: background 0.2s;
 }
-.modal-buttons .btn--warning {
+.btn--warning {
     background: #f44336;
 }
-.modal-buttons .btn:not(.btn--warning) {
-    background: #333;
+.btn:not(.btn--warning):hover {
+    background: #444;
 }
-#game-completion-modal h2 {
-    font-size: 24px;
-    margin-bottom: 20px;
-    color: white;
+.btn--warning:hover {
+    background: #d32f2f;
+}
+.close-button {
+    position: absolute;
+    top: 12px;
+    right: 16px;
+    background: none;
+    border: none;
+    color: #aaa;
+    font-size: 2rem;
+    cursor: pointer;
+    z-index: 2;
+}
+.close-button:hover {
+    color: #fff;
+}
+@media (max-width: 600px) {
+    .modal-content {
+        padding: 16px 4px 16px 4px;
+        max-width: 98vw;
+    }
+    .btn {
+        font-size: 1rem;
+        padding: 14px 0;
+    }
 } 

src/components/GameDetail.jsx

@@ -10,7 +10,7 @@ export default function GameDetail({ game, onFinishGame, onUpdateScore, onBack }
   return (
     <div className={styles['game-detail']}>
       <div className={styles['game-title']}>{game.gameType}{game.raceTo ? ` | Race to ${game.raceTo}` : ''}</div>
-      <div className={styles['player-scores']}>
+      <div className={styles['scores-container']}>
         {playerNames.map((name, idx) => (
           <div className={
             styles['player-score'] + (name === 'Fränky' ? ' ' + styles['franky'] : '')

src/components/GameDetail.module.css

@@ -37,32 +37,44 @@
 .scores-container {
     display: flex;
     justify-content: space-between;
-    gap: 20px;
+    gap: 32px;
     min-height: 0;
 }
 .player-score {
     flex: 1;
     text-align: center;
     padding: 20px;
-    background-color: #333;
-    border-radius: 10px;
+    border-radius: 16px;
     display: flex;
     flex-direction: column;
     min-height: 0;
+    margin: 0 8px;
+}
+.player-score:first-child {
+    background-color: #43a047;
+}
+.player-score:nth-child(2) {
+    background-color: #1565c0;
+}
+.player-score:nth-child(3) {
+    background-color: #333;
 }
 .player-name {
     font-size: 24px;
     margin-bottom: 10px;
     color: #fff;
+    text-shadow: 0 2px 8px rgba(0,0,0,0.4);
     white-space: nowrap;
     overflow: hidden;
     text-overflow: ellipsis;
 }
 .score {
-    font-size: 50vh;
+    font-size: 16vh;
     font-weight: bold;
-    margin: 10px 0;
+    margin: 10px 0 20px 0;
     line-height: 1;
+    color: #fff;
+    text-shadow: 0 2px 8px rgba(0,0,0,0.4);
 }
 .score-buttons {
     display: flex;
@@ -80,6 +92,7 @@
     cursor: pointer;
     transition: background-color 0.2s;
     min-width: 80px;
+    margin-bottom: 8px;
 }
 .game-controls {
     display: flex;
@@ -101,3 +114,29 @@
 .control-button.delete {
     background: #f44336;
 }
+.game-detail-controls {
+    display: flex;
+    flex-direction: row;
+    gap: 24px;
+    margin: 40px 0 0 0;
+    width: 100%;
+    justify-content: center;
+}
+.nav-button {
+    flex: 1;
+    min-width: 200px;
+    padding: 24px 0;
+    color: #fff;
+    background: #333;
+    border: none;
+    border-radius: 8px;
+    font-size: 1.4rem;
+    font-weight: 600;
+    cursor: pointer;
+    transition: background 0.2s, color 0.2s;
+    margin-bottom: 0;
+    margin-top: 0;
+}
+.nav-button:hover:enabled {
+    background: #444;
+} 

src/styles/index.css

@@ -77,3 +77,19 @@ input, select {
 .new-game-button:hover {
   background: #333;
 }
+
+.modal {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100vw;
+  height: 100vh;
+  background-color: rgba(0, 0, 0, 0.8);
+  z-index: 9999;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+}
+.modal.show {
+  display: flex;
+}