#site-sparrow {
    position: fixed;
    left: 0;
    top: 0;
    width: 32px;
    height: 32px;
    z-index: 9999;
    pointer-events: none;
    opacity: 0;
}

    #site-sparrow span {
        display: block;
        font-size: 30px;
        line-height: 32px;
        transform-origin: center center;
    }


    /* =========================================================
   ПРИЛЁТ
   ========================================================= */

    #site-sparrow.sparrow-fly-in {
        opacity: 1;
        animation: sparrow-fly-in 1s ease-out forwards;
    }


    /* =========================================================
   СИДИТ
   ========================================================= */

    #site-sparrow.sparrow-sitting {
        opacity: 1;
        left: var(--sparrow-x);
        top: var(--sparrow-y);
        transform: translate(-50%, -80%);
        animation: sparrow-breathe 1.5s ease-in-out infinite;
    }


    /* =========================================================
   УЛЁТ
   ========================================================= */

    #site-sparrow.sparrow-fly-out {
        opacity: 1;
        animation: sparrow-fly-out 1s ease-in forwards;
    }


/* =========================================================
   АНИМАЦИИ
   ========================================================= */

@keyframes sparrow-fly-in {

    0% {
        left: -50px;
        top: 30%;
        transform: translate(0, -50%) rotate(-10deg);
        opacity: 0;
    }

    15% {
        opacity: 1;
    }

    100% {
        left: var(--sparrow-x);
        top: var(--sparrow-y);
        transform: translate(-50%, -80%) rotate(0deg);
        opacity: 1;
    }
}


@keyframes sparrow-fly-out {

    0% {
        left: var(--sparrow-x);
        top: var(--sparrow-y);
        transform: translate(-50%, -80%) rotate(0deg);
        opacity: 1;
    }

    100% {
        left: calc(100vw + 60px);
        top: 20%;
        transform: translate(0, -50%) rotate(10deg);
        opacity: 0;
    }
}


@keyframes sparrow-breathe {

    0%, 100% {
        margin-top: 0;
    }

    50% {
        margin-top: -2px;
    }
}