body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #87CEEB;
    font-family: 'Arial', sans-serif;
}

.game-container {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    width: 100%;
    max-width: 800px;
    margin: 20px;
}

.stats {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 1;
    background-color: rgba(255, 255, 255, 0.8);
    padding: 10px;
    border-radius: 5px;
    font-size: clamp(14px, 3vw, 20px);
}

.stats > div {
    margin: 5px 0;
}

#gameCanvas {
    border: 2px solid #333;
    background-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
    width: 100%;
    height: auto;
    max-width: 800px;
    aspect-ratio: 4/3;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 10;
}

.game-button {
    padding: clamp(10px, 2vw, 15px) clamp(20px, 4vw, 30px);
    font-size: clamp(16px, 3vw, 24px);
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.game-button:hover {
    background-color: #45a049;
}

.quit-button {
    padding: clamp(8px, 1.5vw, 10px) clamp(15px, 3vw, 20px);
    font-size: clamp(14px, 2.5vw, 18px);
    background-color: #ff4444;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.quit-button:hover {
    background-color: #cc0000;
}

.modal-content {
    background-color: white;
    padding: clamp(20px, 4vw, 30px);
    border-radius: 10px;
    text-align: center;
    width: 90%;
    max-width: 400px;
    margin: 20px;
}

.modal-content.completion {
    border: 3px solid #4CAF50;
    box-shadow: 0 0 15px rgba(76, 175, 80, 0.3);
}

.modal-content h2 {
    margin-top: 0;
    color: #333;
    font-size: clamp(20px, 4vw, 28px);
}

.modal-content.completion h2 {
    color: #4CAF50;
}

.modal-content p {
    font-size: clamp(16px, 3vw, 20px);
}

.countdown-number {
    font-size: clamp(60px, 10vw, 120px);
    color: white;
    font-weight: bold;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.level-up-notification {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    pointer-events: none;
}

.level-up-content {
    background: rgba(0, 0, 0, 0.8);
    padding: clamp(15px, 3vw, 20px) clamp(30px, 5vw, 40px);
    border-radius: 15px;
    border: 3px solid #FFD700;
    animation: popIn 0.5s ease-out;
}

.level-up-title {
    color: #FFD700;
    font-size: clamp(24px, 5vw, 36px);
    font-weight: bold;
    text-align: center;
    text-shadow: 0 0 10px #FFD700;
    margin-bottom: 10px;
}

.level-up-number {
    color: #FFFFFF;
    font-size: clamp(32px, 6vw, 48px);
    font-weight: bold;
    text-align: center;
}

.screen-flash {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.3);
    pointer-events: none;
    animation: flash 0.5s ease-out;
    z-index: 999;
}

@keyframes popIn {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes flash {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

@media (max-width: 480px) {
    .game-container {
        margin: 10px;
    }

    .stats {
        top: 10px;
        left: 10px;
        padding: 8px;
    }
}