/* 4K:  */
	header{padding: 80px;}
	header.fixed{background: #fff;}
	a.logo img{}
	a.logo img.logo-primary{}
	a.logo img.logo-secondary{display: none;}
	header.fixed a.logo img.logo-primary{display: none;}
	header.fixed a.logo img.logo-secondary{display: block;}
	nav ul li{
		color: #fff;
		margin-right: 90px;
		text-transform: uppercase;
		font-weight: 600;
	}
	nav ul li:last-of-type{
		margin-right: 0;
	}
	nav ul li a{
		color: #fff;
		letter-spacing: 4px;
	}
	header.fixed nav ul li,
	header.fixed nav ul li a{
		color: #000;
	}
	.banner{
		background: url(https://img.yingturuida.com/IMG_5312.jpg) no-repeat center;
		background-size: cover;
		position: relative;
	}
	.banner:before {
		content: '';
		position: absolute;
		top: 0;
		left: 0;
		width: 100%;
		height: 100%;
		background: rgba(0,0,0,0.4);
		z-index: 1;
	}
	.banner .container {
		position: relative;
		z-index: 2;
	}
	.banner .text h1 {
		font-weight: 700;
		text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
	}
	.banner .text p {
		text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
	}
	.mt_20 {
		margin-top: 20px;
	}
	.mt_40 {
		margin-top: 40px;
	}
	.banner-buttons .btn {
		border-radius: 5px;
		font-weight: 600;
		transition: all 0.3s ease;
	}
	.banner-buttons .btn:hover {
		transform: translateY(-3px);
		box-shadow: 0 5px 15px rgba(0,0,0,0.2);
	}
	.about{}
	.about p{
		column-gap: 300px;
		column-count: 2;
	}
	.videoplayicon{
		width: 180px; height: 180px;
		border: 1px solid #fff;
	}
	.specs_items .item{flex-basis: 17%;}
	.specs_items .item img{max-width: 50%;}
	.contact{
		padding: 0 80px;
	}
	input, textarea{
		width: 100%;
		max-width: 500px;
		height: 100px !important;
		font-size: 40px !important;
		margin-right: 50px;
		margin-bottom: 50px !important;
	}
	textarea{
		height: 300px !important;
		max-width: 100%;
	}
	input:focus, textarea:focus{
		outline: 2px solid dodgerblue !important;
	}
	button{
		padding: 40px 100px !important;
		font-size: 40px !important;
	}
	.copyright{
	}
	.copyright a{
		color: #000;
		border-bottom: 1px solid #000;
	}
	.social a{
		color: #000;
		padding: 0 20px;
		transition: color 0.3s ease;
	}
	.social a:hover{
		color: #007BFF;
	}
	.social a:last-of-type{
		padding-right: 0;
	}
	
	/* 添加新样式 */
	.mr_10 {
		margin-right: 10px;
	}
	.mr_20 {
		margin-right: 20px;
	}
	.p_20 {
		padding: 20px;
	}
	.bg_black {
		background-color: #000;
	}
	.text_white {
		color: #fff;
	}
	.text_black {
		color: #000;
	}
	.btn {
		border: none;
		cursor: pointer;
		transition: background-color 0.3s ease;
	}
	.btn:hover {
		background-color: #333;
	}
	
	/* 优化图片和文字块 */
	.imageblock {
		background-color: #f9f9f9;
	}
	.imageblock .image img {
		border-radius: 10px;
		box-shadow: 0 5px 15px rgba(0,0,0,0.1);
		transition: transform 0.3s ease;
		margin-top: 20px;
	}
	.imageblock .image img:hover {
		transform: scale(1.02);
	}
	.imageblock .text h3 {
		position: relative;
		padding-bottom: 15px;
	}
	.imageblock .text h3:after {
		content: '';
		position: absolute;
		bottom: 0;
		left: 0;
		width: 60px;
		height: 3px;
		background-color: #007BFF;
	}