```
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: background-color: #2b2b2b;;
    backdrop-filter: blur(10px);
    padding: 10px 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 60;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    color: #333;
    font-size: 16px;
    box-sizing: border-box;
}

#header > *:first-child {
    flex: 1 0 0;
}

#header > *:last-child {
    flex: 1 0 0;
    display: flex;
    justify-content: flex-end;
}

#header-title-container {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

#header-emoji-animation {
    font-size: 22px;
    display: inline-block;
    animation: emoji-spin 4s linear infinite;
    transform-origin: center;
}

@keyframes emoji-spin {
    from {
        transform: rotate(0deg) scale(1);
    }
    50% {
        transform: rotate(180deg) scale(1.2);
    }
    to {
        transform: rotate(360deg) scale(1);
    }
}

#header #play-timelapse-btn {
    position: relative;
    top: auto;
    left: auto;
    transform: none;
    font-size: 24px;
    cursor: pointer;
    border: none;
    background: #e0e0e0;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    transition: transform 0.2s, background-color 0.2s;
}

#header #play-timelapse-btn:hover {
    transform: scale(1.1);
}

#header #show-trace-controls-btn {
    position: fixed;
    top: 10px;
    right: 20px;
    transform: none;
    font-size: 24px;
    cursor: pointer;
    border: none;
    background: #e0e0e0;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    transition: transform 0.2s, background-color 0.2s;
}

#header #show-trace-controls-btn:hover {
    transform: scale(1.1);
}

#viewport {
    width: 100%;
    height: 100%;
    overflow: hidden;
    position: relative;
}

#world {
    position: absolute;
    top: 0;
    left: 0;
    background-color: #2b2b2b;
    transform-origin: 0 0;
}

#paint-canvas, #background-canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
}

#paint-canvas {
    z-index: 2; 
}

#background-canvas {
    z-index: 1;
}

#cursors-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; 
}