body {
    margin: 0;
    padding: 20px;
    background: #222;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

#game-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#gameCanvas {
    display: block;
    margin: 0 auto;
    border: 1px solid #333;
    background: black;
}

#about-container {
    display: flex;
    justify-content: flex-end;
    width: 100%;
    padding-top: 6px;
}

#about-popup-wrapper {
    position: relative;
}

#about-btn {
    background: none;
    border: none;
    color: #666;
    font-size: 12px;
    cursor: pointer;
    padding: 2px 6px;
    font-family: Arial, sans-serif;
}

#about-btn:hover {
    color: #999;
}

#about-popup {
    position: absolute;
    bottom: 100%;
    right: 0;
    margin-bottom: 8px;
    width: 288px;
    background: #2a2a2a;
    border: 1px solid #444;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    padding: 16px;
    z-index: 50;
}

#about-popup.hidden {
    display: none;
}

.about-title {
    font-size: 14px;
    font-weight: 600;
    color: #ddd;
    margin-bottom: 8px;
    font-family: Arial, sans-serif;
}

.about-text {
    font-size: 12px;
    color: #999;
    line-height: 1.5;
    margin: 0 0 12px 0;
    font-family: Arial, sans-serif;
}

.about-links {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-family: Arial, sans-serif;
}

.about-links a {
    color: #888;
    text-decoration: none;
}

.about-links a:hover {
    color: #bbb;
    text-decoration: underline;
}

.about-links span {
    color: #555;
}