body {
    margin: 0;
    overflow: hidden;
    background: #000;
}

#universe {
    width: 100vw;
    height: 100vh;
}

.controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) scale(0);
    z-index: 100;
    background: rgba(0, 0, 0, 0.7);
    padding: 15px;
    border-radius: 25px;
    backdrop-filter: blur(5px);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    max-width: 800px;
    width: 90%;
    transition: transform 0.3s ease;
    transform-origin: bottom center;
}

.controls.active {
    transform: translateX(-50%) scale(1);
}

button {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.4);
    padding: 8px 16px;
    margin: 0 4px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Arial', sans-serif;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 12px;
    min-width: 100px;
}

button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

#addButton {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 101;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    padding: 0;
    min-width: unset;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

#addButton.active {
    transform: translateX(-50%) rotate(45deg);
}

.stats {
    position: fixed;
    top: 20px;
    left: 20px;
    color: white;
    font-family: 'Arial', sans-serif;
    background: rgba(0, 0, 0, 0.7);
    padding: 15px;
    border-radius: 15px;
    backdrop-filter: blur(5px);
}