body {
    font-family: 'Arial', sans-serif;
    background-color: #2c3e50; /* Dark blue background */
    color: #ecf0f1; /* Light grey text */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    overflow: hidden;
}

.game-container {
    background: #34495e; /* Slightly lighter dark blue for container */
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    width: 90%;
    max-width: 600px;
    text-align: center;
    border: 2px solid #2ecc71; /* Green border */
}

h1 {
    color: #f1c40f; /* Yellow title */
    margin-bottom: 20px;
}

/* --- Currency Display --- */
.currency-display {
    margin-bottom: 30px;
    font-size: 1.8em;
    font-weight: bold;
    color: #f1c40f; /* Yellow for currency */
}

#currency-amount {
    font-size: 2.5em;
    color: #ecf0f1; /* White for main number */
}

#cps-display {
    font-size: 0.8em;
    color: #2ecc71; /* Green for CPS */
}

/* --- Main Clicker --- */
.main-clicker {
    width: 150px;
    height: 150px;
    background-color: #f1c40f; /* Yellow background for clicker */
    border-radius: 50%;
    margin: 0 auto 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
    transition: transform 0.1s ease-out;
    border: 5px solid #e6b300;
}

.main-clicker:active {
    transform: scale(0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}

#clicker-image {
    width: 120px;
    height: 120px;
    display: block;
    user-select: none; /* Prevent dragging */
}

/* If using emoji instead of image */
#clicker-icon {
    font-size: 4em;
}

/* --- Shop Panel --- */
.shop-panel {
    background-color: #2c3e50;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #3a5068;
}

.shop-panel h2 {
    color: #bdc3c7;
    margin-bottom: 20px;
}

#upgrades-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.upgrade-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #34495e;
    padding: 12px 15px;
    border-radius: 6px;
    border: 1px solid #4a627a;
    transition: background-color 0.1s;
}

.upgrade-item:hover {
    background-color: #3e566b;
}

.upgrade-name {
    font-weight: bold;
    color: #ecf0f1;
    flex: 2;
    text-align: left;
}

.upgrade-info {
    font-size: 0.9em;
    color: #bdc3c7;
    flex: 3;
    text-align: right;
    margin-right: 10px;
}

.upgrade-info .cost {
    color: #f1c40f;
    font-weight: bold;
}

.upgrade-info .cps {
    color: #2ecc71;
    font-weight: bold;
}

.upgrade-level {
    font-size: 0.9em;
    color: #95a5a6;
    flex: 1;
    text-align: right;
    margin-right: 10px;
}

.upgrade-item button {
    padding: 8px 15px;
    background-color: #2ecc71;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s;
}

.upgrade-item button:hover:not(:disabled) {
    background-color: #27ae60;
}

.upgrade-item button:disabled {
    background-color: #7f8c8d;
    cursor: not-allowed;
}