body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.game-container {
    width: 100%;
    height: 80vh;
    position: relative;
}
#gameCanvas {
    display: block;
    background-color: #1a202c;
    cursor: crosshair;
}
.upgrade-btn {
    transition: all 0.2s ease;
}

.upgrade-btn:active {
    transform: scale(0.95);
}
#helpMenu, #leaderboard {
    min-width: 150px;
    z-index: 100;
}

#closeHelp {
    cursor: pointer;
    transition: color 0.2s;
}
#leaderboardList li {
    display: flex;
    justify-content: space-between;
    margin-bottom: 4px;
}

.player-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100px;
}

.player-score {
    font-weight: bold;
}

@media (max-width: 768px) {
    .game-container {
        height: 70vh;
    }
    
    #leaderboard {
        font-size: 0.8rem;
        padding: 8px;
        min-width: 120px;
    }
    
    #upgradeMenu {
        width: calc(100% - 32px);
        left: 16px;
    }
}