body {
    margin: 0;
    padding: 20px;
    background: #2a2a2a;
    color: white;
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#gameContainer {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

#gameCanvas {
    border: 3px solid #555;
    background: #1a1a1a;
    cursor: crosshair;
}

#controls {
    background: #333;
    padding: 20px;
    border-radius: 8px;
    min-width: 200px;
}

.control-section {
    margin-bottom: 20px;
}

.control-section h3 {
    margin: 0 0 10px 0;
    color: #4CAF50;
}

button {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 10px 15px;
    margin: 5px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

button:hover {
    background: #45a049;
}

button:disabled {
    background: #666;
    cursor: not-allowed;
}

.tower-btn {
    display: block;
    width: 100%;
    margin: 5px 0;
    text-align: left;
}

.selected {
    background: #FF6B35 !important;
}

#gameStats {
    display: flex;
    gap: 20px;
    margin-bottom: 10px;
}

.stat {
    background: #444;
    padding: 10px;
    border-radius: 4px;
    min-width: 80px;
    text-align: center;
}

.stat-label {
    font-size: 12px;
    color: #ccc;
}

.stat-value {
    font-size: 18px;
    font-weight: bold;
    color: #4CAF50;
}

#upgradeSection {
    background: #444;
    border-radius: 4px;
    padding: 10px;
}

.upgrade-info {
    background: #555;
    padding: 8px;
    border-radius: 4px;
    margin: 8px 0;
    font-size: 12px;
    color: #ddd;
}