//背景图片设置
body {
	font-family: sans-serif;
}

.gallery{
	display: flex;
	flex-wrap: wrap;
	justify-content: space-evenly;
}
.gallery a{
	position: relative;
	display: inline-block;
}
.gallery img{
	width: 200px;
	margin: 4px;
	filter: grayscale(100%);
	transition: 1s;
	border: 2px solid #e74c3c;
	border-radius: 4px;
	box-sizing: border-box;
}
.gallery img:hover{
	filter: grayscale(0%);
	transform: scale(1.1);
	border-color: #c0392b;
	box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.gallery .img-number {
	position: absolute;
	bottom: 10px;
	right: 10px;
	background: rgba(0,0,0,0.7);
	color: #fff;
	font-size: 12px;
	padding: 3px 8px;
	border-radius: 3px;
	pointer-events: none;
	opacity: 0;
	transition: opacity 0.3s ease;
}

.gallery a:hover .img-number {
	opacity: 1;
}

@media (max-width: 768px) {
	.gallery img {
		width: 150px;
		margin: 3px;
	}
	.gallery .img-number {
		font-size: 10px;
		padding: 2px 6px;
	}
}

@media (max-width: 480px) {
	.gallery img {
		width: 120px;
		margin: 2px;
	}
	.gallery .img-number {
		font-size: 9px;
		padding: 2px 5px;
	}
}