@flex-column: 24;

.flex-clearfix() {
	&:before, &:after {
		content: " ";
		display: flex;
		box-sizing: border-box;
		width: 0;
		height: 0;
		font-size: 0;
	}
	&:after {
		clear: both;
	}
}

.flex-column, .flex-row {
	display: flex;
	flex-wrap: wrap;
	.flex-clearfix();
}
.flex-column {
	flex-direction: row;
}
.flex-row {
	flex-direction: column;
}
.flex-around {
	justify-content: space-around;
}
.flex-between {
	justify-content: space-between;
}
.flex-baseline {
	align-items: baseline;
}
.flex-strech {
	align-items: stretch;
}

.flex-item {
	float: left;
	flex-grow: 1;
}

// 递归生成栅格
.build-item(@i) when (@i > 0) {
	.build-item((@i - 1));
	
	// 栅格
	.flex-item-@{i} {
		float: left;
		width: percentage(@i / @flex-column);
	}
	
	// 向左偏移
	.flex-offset-@{i} {
		margin-left: percentage(@i / @flex-column);
	}
	
	// 排序
	.flex-order-@{i} {
		order: @i;
	}
}

.build-item(@flex-column);

// flex-row的对齐方式
.build-align(@type) when (@type = row) {
	&.flex-left {
		align-items: flex-start;
	}
	&.flex-right {
		align-items: flex-end;
	}
	&.flex-top {
		justify-content: flex-start;
	}
	&.flex-bottom {
		justify-content: flex-end;
	}
	&.flex-center {
		align-items: center;
	}
	&.flex-middle {
		justify-content: center;
	}
}
// flex-column的对齐方式
.build-align(@type) when (@type = column) {
	&.flex-left {
		justify-content: flex-start;
	}
	&.flex-right {
		justify-content: flex-end;
	}
	&.flex-top {
		align-items: flex-start;
	}
	&.flex-bottom {
		align-items: flex-end;
	}
	&.flex-center {
		justify-content: center;
	}
	&.flex-middle {
		align-items: center;
	}
}

.flex-column {
	.build-align(column);
}
.flex-row {
	.build-align(row);
}

[class*=flex-item] {
	&.flex-left {
		margin-right: auto;
	}
	&.flex-right {
		margin-left: auto;
	}
	&.flex-top {
		margin-bottom: auto;
	}
	&.flex-bottom {
		margin-top: auto;
	}
	&.flex-center {
		margin-left: auto;
		margin-right: auto;
	}
	&.flex-middle {
		margin-top: auto;
		margin-bottom: auto;
	}
}

.flex-sm-show, .flex-md-show {
	display: none;
}

@media (max-width: 992px) {
	.flex-md {
		flex-direction: column;
		.build-align(row);
		
		[class*=flex-item] {
			width: 100%;
		}
	}
	.flex-md-hide {
		display: none !important;
	}
	.flex-md-show {
		display: flex !important;
	}
}

@media (max-width: 768px) {
	.flex-sm {
		flex-direction: column;
		.build-align(row);

		[class*=flex-item] {
			width: 100%;
		}
	}
	.flex-sm-hide {
		display: none !important;
	}
	.flex-sm-show {
		display: flex !important;
	}
}