* {
     margin: 0;
     padding: 0;
     box-sizing: border-box;
 }

 body {
     margin: 0;
     display: flex;
     justify-content: center;
     align-items: center;
     height: 100vh;
     background: linear-gradient(135deg, #FFE5B4, #FFCCCB, #E0E6FF);
     overflow: hidden;
 }

 /* Wrapper that handles scaling */
 .scale-wrapper {
     width: 100%;
     height: 100%;
     display: flex;
     justify-content: center;
     align-items: center;
 }

 .game-container {
     width: 780px;
     height: 750px;
     position: relative;
     background: linear-gradient(45deg, #FFF8DC, #F0F8FF);
     border: 5px solid #4CAF50;
     border-radius: 20px;
 }

 .header {
     display: flex;
     justify-content: space-between;
     align-items: center;
     padding: 20px 30px;
     background: linear-gradient(90deg, #87CEEB, #98FB98);
     border-radius: 15px 15px 0 0;
     height: 80px;
 }

 .score {
     font-size: 24px;
     font-weight: bold;
     color: #2E8B57;
     display: flex;
     align-items: center;
 }

 .hearts {
     display: flex;
     margin-left: 20px;
 }

 .heart {
     font-size: 30px;
     margin: 0 3px;
     color: #FF6B6B;
     animation: heartbeat 1.5s ease-in-out infinite;
 }

 @keyframes heartbeat {
     0% {
         transform: scale(1);
     }

     50% {
         transform: scale(1.1);
     }

     100% {
         transform: scale(1);
     }
 }

 .home-btn {
     background: #FF7F50;
     border: none;
     padding: 12px 20px;
     border-radius: 25px;
     color: white;
     font-size: 18px;
     font-weight: bold;
     cursor: pointer;
     transition: all 0.3s;
 }

 .home-btn:hover {
     background: #FF6347;
     transform: scale(1.1);
 }

 .mode-selection {
     text-align: center;
     padding: 50px;
 }

 .mode-title {
     font-size: 36px;
     color: #4CAF50;
     margin-bottom: 40px;
     text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
 }

 .mode-buttons {
     display: grid;
     grid-template-columns: repeat(3, 1fr);
     gap: 20px;
     max-width: 600px;
     margin: 0 auto;
 }

 .mode-btn {
     background: linear-gradient(45deg, #FFB6C1, #87CEEB);
     border: none;
     padding: 25px;
     border-radius: 20px;
     font-size: 20px;
     font-weight: bold;
     color: #2E8B57;
     cursor: pointer;
     transition: all 0.3s;
     box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
 }

 .mode-btn:hover {
     transform: translateY(-5px);
     box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
 }

 .game-area {
     display: none;
     text-align: center;
     padding: 50px;
     height: calc(100% - 80px);
 }

 .level-info {
     font-size: 24px;
     color: #4CAF50;
     margin-bottom: 30px;
     font-weight: bold;
 }

 .equation {
     font-size: 48px;
     color: #2E8B57;
     margin: 40px 0;
     font-weight: bold;
     text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
 }

 .answer-input {
     font-size: 36px;
     padding: 15px 25px;
     border: 4px solid #87CEEB;
     border-radius: 15px;
     text-align: center;
     width: 200px;
     margin: 20px;
     background: #FFF8DC;
     color: #2E8B57;
 }

 .submit-btn {
     background: linear-gradient(45deg, #32CD32, #7FFF00);
     border: none;
     padding: 20px 40px;
     border-radius: 25px;
     font-size: 24px;
     font-weight: bold;
     color: white;
     cursor: pointer;
     margin: 20px;
     transition: all 0.3s;
     box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
 }

 .submit-btn:hover {
     transform: scale(1.1);
     box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
 }

 .animation-overlay {
     position: absolute;
     top: 0;
     left: 0;
     width: 100%;
     height: 100%;
     display: none;
     justify-content: center;
     align-items: center;
     background: rgba(255, 255, 255, 0.9);
     z-index: 1000;
 }

 .animation-content {
     text-align: center;
     font-size: 60px;
     animation: bounce 0.6s ease-in-out;
 }

 @keyframes bounce {
     /* 0% {
         transform: scale(0) rotate(0deg);
     }

     50% {
         transform: scale(1.2) rotate(180deg);
     }

     100% {
         transform: scale(1) rotate(360deg);
     } */
 }

 .stars {
     position: absolute;
     width: 100%;
     height: 100%;
     pointer-events: none;
 }

 .star {
     position: absolute;
     font-size: 24px;
     color: #FFD700;
     animation: twinkle 1s ease-out forwards;
 }

 @keyframes twinkle {
     0% {
         transform: scale(0) rotate(0deg);
         opacity: 1;
     }

     100% {
         transform: scale(1.5) rotate(360deg);
         opacity: 0;
     }
 }

 .game-over {
     display: none;
     text-align: center;
     padding: 100px 50px;
 }

 .game-over h2 {
     font-size: 48px;
     color: #FF6347;
     margin-bottom: 30px;
 }

 .final-score {
     font-size: 36px;
     color: #4CAF50;
     margin: 30px 0;
     font-weight: bold;
 }

 .replay-btn {
     background: linear-gradient(45deg, #FF69B4, #FFB6C1);
     border: none;
     padding: 20px 40px;
     border-radius: 25px;
     font-size: 24px;
     font-weight: bold;
     color: white;
     cursor: pointer;
     margin: 20px;
     transition: all 0.3s;
 }

 .replay-btn:hover {
     transform: scale(1.1);
 }