body,
html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: #1a0f12;
    /* Deep dark romantic background */
    overflow: hidden;
    /* Prevent scrolling when emojis move */
    user-select: none;
    /* Prevent text selection on rapid clicking */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    font-family: sans-serif;
    touch-action: none;
    /* Prevent pull-to-refresh and zooming on mobile */
}

#game-container {
    width: 100%;
    height: 100%;
    position: relative;
}

.heart {
    position: absolute;
    cursor: pointer;
    line-height: 1;
    /* keep bounding box tight to the emoji */
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.1s ease-out;
    /* tiny pop effect when we apply scaling */
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    /* additional safety */
}

.heart:active {
    /* Slight press-down effect */
    transform: scale(0.9) !important;
}