.bird{
    //background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/174479/bird-cells-new.svg');
    background-image: url('../images/header/flyingbirds.svg');
    //filter: invert(34%) sepia(55%) saturate(427%) hue-rotate(141deg) brightness(93%) contrast(91%);
    filter: invert(34%) sepia(55%) saturate(427%) hue-rotate(141deg) brightness(1000%) contrast(91%);
    background-size: auto 100%;
    width: 88px;
    height: 125px;
    //width: 44px;
    //height: 63px;
    will-change: background-position;
    animation-name: fly-cycle1;
    animation-timing-function: steps(10);
    animation-iteration-count: infinite;
}

/* 鳥の羽ばたき */
.bird-one{
    //filter: invert(34%) sepia(55%) saturate(427%) hue-rotate(141deg) brightness(150%) contrast(200%);
    animation-duration: 1s;
    animation-delay: -0.5s;

}
.bird-two{
    animation-duration: 0.9s;
    animation-delay: -0.75s;

}
.bird-three{
    //filter: invert(34%) sepia(55%) saturate(427%) hue-rotate(141deg) brightness(200%) contrast(100%);
    //filter: invert(34%) sepia(55%) saturate(3000%) hue-rotate(141deg) brightness(93%) contrast(150%);
    animation-duration:1.25s;
    animation-delay: -0.25s

}
.bird-four{
    //filter: invert(34%) sepia(55%) saturate(4270%) hue-rotate(141deg) brightness(93%) contrast(150%);
    animation-duration: 1.1s;
    animation-delay: -0.5s;
}

/* 鳥の飛翔（移動） */
.bird-container {
	position: absolute;
	top: 10%;
	left: -3%;
	transform: scale(0) translateX(-10vw);
	will-change: transform;
	animation-name: fly-right-one;
	animation-timing-function: linear;
	//animation-iteration-count: infinite;
	animation-iteration-count: 2;
}
	
.bird-container-one{
	animation-duration: 15s;
	animation-delay: 40s;
}
	
.bird-container-two{
	animation-name: fly-right-two;
	animation-duration: 16s;
	animation-delay: 41s;
}
	
.bird-container-three{
	animation-name: fly-right-three;
	animation-duration: 14.6s;
	animation-delay: 49.5s;
}
	
.bird-container-four {
		animation-duration: 16s;
		animation-delay: 50.25s;
}

/* スマホの場合、画像を小さく、羽ばたきは早く、飛翔も早く */
@media screen and (max-width:800px){
	.bird{
	    width: 44px;
	    height: 63px;
	    //width: 30px;
	    //height: 43px;
	    animation-name: fly-cycle2;
	}
	.bird-one{
	    animation-duration: 0.65s;

	}
	.bird-two{
	    animation-duration: 0.55s;
	}
	.bird-three{
	    animation-duration:0.75s;

	}
	.bird-four{
	    animation-duration: 0.6s;
	}
	.bird-container-one{
		animation-duration: 8s;
	}
		
	.bird-container-two{
		animation-duration: 6s;
	}
		
	.bird-container-three{
		animation-duration: 9.4s;
	}

	.bird-container-four {
			animation-duration: 7s;
	}
}

/* 羽ばたきアニメーション */
@keyframes fly-cycle1 {
    100%{
        background-position: -3600px 0;
    }
}
@keyframes fly-cycle2 {
	100% {
		background-position: -900px 0;
	}
}
@keyframes fly-cycle3 {
	100% {
		background-position: -320px 0;
	}
}

/* 飛翔アニメーション */
@keyframes fly-right-one {
	0% {
		transform: scale(0.3) translateX(-10vw);
	}
	
	10% {
		transform: translateY(2vh) translateX(10vw) scale(0.4);
	}
	
	20% {
		transform: translateY(0vh) translateX(30vw) scale(0.5);
	}
	
	30% {
		transform: translateY(4vh) translateX(50vw) scale(0.6);
	}
	
	40% {
		transform: translateY(2vh) translateX(70vw) scale(0.6);
	}
	
	50% {
		transform: translateY(0vh) translateX(90vw) scale(0.6);
	}
	
	60% {
		transform: translateY(0vh) translateX(110vw) scale(0.6);
	}
	
	100% {
		transform: translateY(0vh) translateX(110vw) scale(0.6);
	}
	
}

@keyframes fly-right-two {
	0% {
		transform: translateY(-2vh) translateX(-10vw) scale(0.5);
	}
	
	10% {
		transform: translateY(0vh) translateX(10vw) scale(0.4);
	}
	
	20% {
		transform: translateY(4vh) translateX(30vw) scale(0.6);
	}
	
	30% {
		transform: translateY(9vh) translateX(50vw) scale(0.45);
	}
	
	40% {
		transform: translateY(6.5vh) translateX(70vw) scale(0.5);
	}
	
	50% {
		transform: translateY(2vh) translateX(90vw) scale(0.45);
	}
	
	51% {
		transform: translateY(0vh) translateX(110vw) scale(0.45);
	}
	
	100% {
		transform: translateY(0vh) translateX(110vw) scale(0.45);
	}
}

@keyframes fly-right-three {
	0% {
		transform: translateY(-2vh) translateX(110vw) scale(0.5);
	}
	
	10% {
		transform: translateY(10vh) translateX(90vw) scale(0.4);
	}
	
	20% {
		transform: translateY(14vh) translateX(70vw) scale(0.6);
	}
	
	30% {
		transform: translateY(15vh) translateX(50vw) scale(0.45);
	}
	
	40% {
		transform: translateY(10vh) translateX(30vw) scale(0.5);
	}
	
	50% {
		transform: translateY(20vh) translateX(10vw) scale(0.45);
	}
	
	70% {
		transform: translateY(5vh) translateX(-10vw) scale(0.45);
	}
	
	100% {
		transform: translateY(0vh) translateX(-10vw) scale(0.45);
	}
}