css翻书动画

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html

css

* {
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
:root {
	--hue: 223;
	--bg: hsl(var(--hue),10%,90%);
	--fg: hsl(var(--hue),10%,10%);
	--primary: hsl(var(--hue),90%,55%);
	--primary-l: hsl(var(--hue),90%,65%);
	--primary-d: hsl(var(--hue),90%,45%);
	--white: hsl(var(--hue),10%,100%);
	--white-d: hsl(var(--hue),10%,45%);
	font-size: calc(16px + (24 - 16) * (100vw - 320px) / (1280 - 320));
}
body {
	background-color: #1F1F1F;
	color: var(--fg);
	font: 1em/1.5 sans-serif;
	height: 100vh;
	display: grid;
	place-items: center;
}
.book,
.book__pg-shadow,
.book__pg {
	animation: cover 7s ease-in-out infinite;
}
.book {
	background-color: var(--primary-l);
	border-radius: 0.25em;
	box-shadow:
		0 0.25em 0.5em hsla(0,0%,0%,0.3),
		0 0 0 0.25em var(--primary) inset;
	padding: 0.25em;
	perspective: 37.5em;
	position: relative;
	width: 8em;
	height: 6em;
	transform: translate3d(0,0,0);
	transform-style: preserve-3d;
}
.book__pg-shadow,
.book__pg {
	position: absolute;
	left: 0.25em;
	width: calc(50% - 0.25em);
}
.book__pg-shadow {
	animation-name: shadow;
	background-image: linear-gradient(-45deg,hsla(0,0%,0%,0) 50%,hsla(0,0%,0%,0.3) 50%);
	filter: blur(0.25em);
	top: calc(100% - 0.25em);
	height: 3.75em;
	transform: scaleY(0);
	transform-origin: 100% 0%;
}
.book__pg {
	animation-name: pg1;
	background-color: var(--white);
	background-image: linear-gradient(90deg,hsla(var(--hue),10%,90%,0) 87.5%,hsl(var(--hue),10%,90%));
	height: calc(100% - 0.5em);
	transform-origin: 100% 50%;
}
.book__pg--2,
.book__pg--3,
.book__pg--4 {
	background-image:
		repeating-linear-gradient(hsl(var(--hue),10%,10%) 0 0.125em,hsla(var(--hue),10%,10%,0) 0.125em 0.5em),
		linear-gradient(90deg,hsla(var(--hue),10%,90%,0) 87.5%,hsl(var(--hue),10%,90%));
	background-repeat: no-repeat;
	background-position: center;
	background-size: 2.5em 4.125em, 100% 100%;
}
.book__pg--2 {
	animation-name: pg2;
}
.book__pg--3 {
	animation-name: pg3;
}
.book__pg--4 {
	animation-name: pg4;
}
.book__pg--5 {
	animation-name: pg5;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
	:root {
		--bg: hsl(var(--hue),10%,30%);
		--fg: hsl(var(--hue),10%,90%);
	}
}

/* Animations */
@keyframes cover {
	from, 5%, 45%, 55%, 95%, to {
		animation-timing-function: ease-out;
		background-color: var(--primary-l);
	}
	10%, 40%, 60%, 90% {
		animation-timing-function: ease-in;
		background-color: var(--primary-d);
	}
}
@keyframes shadow {
	from, 10.01%, 20.01%, 30.01%, 40.01% {
		animation-timing-function: ease-in;
		transform: translate3d(0,0,1px) scaleY(0) rotateY(0);
	}
	5%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, 85%, 95% {
		animation-timing-function: ease-out;
		transform: translate3d(0,0,1px) scaleY(0.2) rotateY(90deg);
	}
	10%, 20%, 30%, 40%, 50%, to {
		animation-timing-function: ease-out;
		transform: translate3d(0,0,1px) scaleY(0) rotateY(180deg);
	}
	50.01%, 60.01%, 70.01%, 80.01%, 90.01% {
		animation-timing-function: ease-in;
		transform: translate3d(0,0,1px) scaleY(0) rotateY(180deg);
	}
	60%, 70%, 80%, 90%, to {
		animation-timing-function: ease-out;
		transform: translate3d(0,0,1px) scaleY(0) rotateY(0);
	}
}
@keyframes pg1 {
	from, to {
		animation-timing-function: ease-in-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(0.4deg);
	}
	10%, 15% {
		animation-timing-function: ease-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(180deg);
	}
	20%, 80% {
		animation-timing-function: ease-in;
		background-color: var(--white-d);
		transform: translate3d(0,0,1px) rotateY(180deg);
	}
	85%, 90% {
		animation-timing-function: ease-in-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(180deg);
	}
}
@keyframes pg2 {
	from, to {
		animation-timing-function: ease-in;
		background-color: var(--white-d);
		transform: translate3d(0,0,1px) rotateY(0.3deg);
	}
	5%, 10% {
		animation-timing-function: ease-in-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(0.3deg);
	}
	20%, 25% {
		animation-timing-function: ease-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(179.9deg);
	}
	30%, 70% {
		animation-timing-function: ease-in;
		background-color: var(--white-d);
		transform: translate3d(0,0,1px) rotateY(179.9deg);
	}
	75%, 80% {
		animation-timing-function: ease-in-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(179.9deg);
	}
	90%, 95% {
		animation-timing-function: ease-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(0.3deg);
	}
}
@keyframes pg3 {
	from, 10%, 90%, to {
		animation-timing-function: ease-in;
		background-color: var(--white-d);
		transform: translate3d(0,0,1px) rotateY(0.2deg);
	}
	15%, 20% {
		animation-timing-function: ease-in-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(0.2deg);
	}
	30%, 35% {
		animation-timing-function: ease-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(179.8deg);
	}
	40%, 60% {
		animation-timing-function: ease-in;
		background-color: var(--white-d);
		transform: translate3d(0,0,1px) rotateY(179.8deg);
	}
	65%, 70% {
		animation-timing-function: ease-in-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(179.8deg);
	}
	80%, 85% {
		animation-timing-function: ease-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(0.2deg);
	}
}
@keyframes pg4 {
	from, 20%, 80%, to {
		animation-timing-function: ease-in;
		background-color: var(--white-d);
		transform: translate3d(0,0,1px) rotateY(0.1deg);
	}
	25%, 30% {
		animation-timing-function: ease-in-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(0.1deg);
	}
	40%, 45% {
		animation-timing-function: ease-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(179.7deg);
	}
	50% {
		animation-timing-function: ease-in;
		background-color: var(--white-d);
		transform: translate3d(0,0,1px) rotateY(179.7deg);
	}
	55%, 60% {
		animation-timing-function: ease-in-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(179.7deg);
	}
	70%, 75% {
		animation-timing-function: ease-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(0.1deg);
	}
}
@keyframes pg5 {
	from, 30%, 70%, to {
		animation-timing-function: ease-in;
		background-color: var(--white-d);
		transform: translate3d(0,0,1px) rotateY(0);
	}
	35%, 40% {
		animation-timing-function: ease-in-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(0deg);
	}
	50% {
		animation-timing-function: ease-in-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(179.6deg);
	}
	60%, 65% {
		animation-timing-function: ease-out;
		background-color: var(--white);
		transform: translate3d(0,0,1px) rotateY(0);
	}
}

JavaScript

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