.main .m_btn{display: block;width: 156px;height: 48px;line-height: 48px;background: linear-gradient(to right, #e50014, #f63704);border-radius: 4px;text-align: center;font-size: 16px;color: #fff;margin-top: 30px;}
.main .m_btn_2{background: linear-gradient(to left, #FB8732, #F6C418);}
.main .m_btn:hover{opacity: 0.9;}
/* 大屏，最小768 */
@media screen and (min-width: 768px){
	.banner{width: 100%;margin: 0px auto;background: url(../img/product/chain/banner.jpg) top center no-repeat;overflow: hidden;height: 450px;}
	.banner .m{margin-top: 62px;}
	.banner h3{font-size: 24px;color: #fff;font-weight: normal;}
	.banner h2{font-size: 36px;color: #fff;position: relative;}
	.banner h2::after{width: 110px;height: 2px;background: #fff;content: "";position: absolute;left: 0px;top: 66px;}
	.banner p{font-size: 20px;color: #fff;width: 500px;line-height: 32px;margin-top: 30px;}
	.banner a{float: left;margin-right: 20px;}
	.main .m_btn{display: block;width: 156px;height: 48px;line-height: 48px;background: linear-gradient(to right, #e50014, #f63704);border-radius: 4px;text-align: center;font-size: 16px;color: #fff;margin-top: 30px;}
	.main .m_btn_2{background: linear-gradient(to left, #FB8732, #F6C418);}
	.main .m_btn:hover{opacity: 0.9;}
	.m_1{width: 1200px;margin: 60px auto;}
	.m_1 ul{width: 100%;margin: 40px auto 0px;}
	.m_1 ul li{width: 275px;float: left;margin-right: 20px;border-radius: 6px;box-shadow: 0px 0px 20px rgba(0,0,0,0.1);overflow: hidden;cursor: pointer;transition: 0.3s all;}
	.m_1 ul li:first-child{margin-left: 20px;}
	.m_1 ul li i{width: 100%;margin: 0px auto;display: block;}
	.m_1 ul li p{color: #666;font-size: 14px;text-align: center;padding: 16px;}
	.m_1 ul li:hover{box-shadow: 0px 0px 30px rgba(0,0,0,0.2);}
	.m_2{width: 100%;margin: 0px auto;padding: 60px 0px;background: #f9faf9;overflow: hidden;}
	.m_2 ul{width: 1200px;margin: 40px auto 0px;background: url(../img/product/chain/pic001.png) top center no-repeat;height: 530px;}
	.m_2 ul li{width: 300px;border: 1px solid #C6D2EA;background: rgba(255,255,255,0.2);border-radius: 6px;padding: 20px;overflow: hidden;margin: 0px 20px;box-shadow: 0px 0px 20px rgba(0,0,0,0.08);}
	.m_2 ul li:nth-child(2n){float: right;}
	.m_2 ul li dt{margin-bottom: 10px;}
	.m_2 ul li dt h3{font-size: 22px;margin-bottom: 10px;font-weight: bold;}
	.m_2 ul li dt p{font-size: 16px;color: #666;font-weight: normal;}
	.m_2 ul li dl{box-sizing: border-box;}
	.m_2 ul li dd{font-size: 16px;position: relative;padding-left: 20px;color: #666;line-height: 32px;display: inline-block;width: 40%;box-sizing: content-box;}
	.m_2 ul li dd::before{width: 6px;height: 6px;background: #becfed;content: "";position: absolute;left: 6px;top: 14px;border-radius: 50%;}
	.m_2 ul li:nth-child(3){margin-top: 80px;}
	.m_2 ul li:nth-child(2){margin-top: -230px;}
	.m_2 ul li:nth-child(4){margin-top: -240px;}
	.m_2 ul .list-m{margin: -380px 460px 0px;float: none;background: rgba(255,255,255,0.8);}
	.m_3{width: 1200px;margin: 60px auto 0px;overflow: hidden;}
	.m_4{width: 100%;margin: 0px auto;background: #f9faf9;padding: 0px 0px 60px;overflow: hidden;}
	.m_4 .title{background: #fff url(../img/product/chain/bg1.png) top center no-repeat;overflow: hidden;padding: 40px 0px 60px;}
	.m_4 .title h2{color: #fff;font-style: italic;margin: 20px 0px 10px;}
	.m_4 .title p{color: #fff;}
	.m_4 .m{background: #fff;border-radius: 8px;box-shadow: 0px 0px 20px rgba(0,0,0,0.1);overflow: hidden;padding: 40px 0px;margin-top: -40px;}
	.m_4 .tit_2{text-align: center;margin: 0px auto;}
	.m_4 .tit_2 h3{font-size: 28px;text-align: center;overflow: hidden;color: #fc8832;}
	.m_4 .tit_2 h3 i{display: inline-block;width: 40px;height: 40px;border-radius: 50%;background: #fc8832;color: #fff;line-height: 40px;margin-right: 16px;font-size: 26px;}
	.m_4 .tit_2  p{font-size: 18px;text-align: center;color: #333;margin: 20px auto 0px;}
	.m_4 .ul_1{width: 800px;margin: 30px auto 0px;}
	.m_4 .ul_1 li{width: 160px;float: left;text-align: center;cursor: pointer;}
	.m_4 .ul_1 li i{width: 80px;height: 80px;display: block;margin: 0px auto;border-radius: 50%;}
	.m_4 .ul_1 li p{font-size: 14px;margin-top: 10px;color: #666;}
	.m_4 .simg{width: 1000px;margin: 30px auto;overflow: hidden;}
	.m_4 .simg img{width: 100%;}
	.m_4 .alink{width: 1000px;margin: 0px auto;box-sizing: border-box;text-align: center;border-bottom: 1px solid #eee;padding-bottom: 40px;margin-bottom: 40px;}
	.m_4 .alink a{display: inline-block;margin: 10px 20px 0px;}
	.m_4 .alink:last-child{border-bottom: 0px;padding-bottom: 0px;margin-bottom: 0px;}
	.m_5 .title{background: url(../img/product/chain/bg2.png) top center no-repeat;}
	.m_5 .tit_2 h3{color: #0082f1;}
	.m_5 .tit_2 h3 i{background: #0082f1;}
	.m_6 .title{background: url(../img/product/chain/bg1.png) top center no-repeat;}
	.m_4 .ul_2{width: 1000px;margin: 10px auto 0px;}
	.m_4 .ul_2 li{width: 166px;float: left;text-align: center;overflow: hidden;cursor: pointer;transition: 0.3s all;}
	.m_4 .ul_2 li i{width: 80px;height: 80px;border-radius: 50%;display: block;margin: 20px auto 0px;}
	.m_4 .ul_2 li p{font-size: 14px;margin-top: 10px;color: #333;}
	.m_4 .ul_1 li:hover i,.m_4 .ul_2 li:hover i{transform: translateY(-5px);transition: 0.3s all;}
	.m_4 .ul_3{width: 800px;margin: 10px auto 30px;overflow: hidden;}
	.m_4 .ul_3 li{width: 199px;float: left;text-align: center;overflow: hidden;border-right: 1px solid #eee;border-bottom: 1px solid #eee;padding-bottom: 20px;cursor: pointer;}
	.m_4 .ul_3 li i{width: 80px;height: 80px;border-radius: 50%;display: block;margin: 20px auto 0px;}
	.m_4 .ul_3 li p{font-size: 14px;margin-top: 10px;color: #333;}
	.m_4 .ul_3 li:nth-child(4n){border-right: 0px;}
	.m_4 .ul_3 li:nth-child(5),.m_4 .ul_3 li:nth-child(6),.m_4 .ul_3 li:nth-child(7),.m_4 .ul_3 li:nth-child(8){border-bottom: 0px;}
	.m_4 .ul_3 li:hover{background: #f9faf9;transition: 0.3s all;}
	.m_7{width: 1200px;margin: 60px auto;overflow: hidden;box-sizing: border-box;text-align: center;}
	.m_7 ul{width: 100%;margin: 20px auto 0px;overflow: hidden;}
	.m_7 ul li{width: 280px;margin: 10px 0px 10px 10px;float: left;text-align: center;cursor: pointer;padding: 30px 0px;transition: 0.3s all;}
	.m_7 ul li i{width: 80px;height: 80px;margin: 0px auto 20px;display: block;border-radius: 50%;}
	.m_7 ul li h3{font-size: 16px;color: #333;margin-bottom: 10px;}
	.m_7 ul li p{font-size: 14px;color: #666;padding: 0px 26px;}
	.m_7 ul li:hover{box-shadow: 0px 0px 10px rgba(0,0,0,0.1);}
	.m_7 ul li:nth-child(4n){margin-right: 10px;}
	.m_7 .m_btn{display: inline-block;margin: 30px 20px 0px;}
}
/* 小屏，最大768 */
@media screen and (max-width: 768px){
	.banner{background: url(../img/product/chain/mbanner.jpg) top center no-repeat;background-size: cover;overflow: hidden;text-align: center;padding-bottom: 2rem;}
	.banner .m h2{font-size: 1.6rem;}
	.banner .m p{font-size: 0.9rem;}
	.banner .m .m_btn{background: #fff;color: #fa771a;}
	.banner .m .m_btn_2{background: transparent;color: #fff;}
	.m_1{width: 98%;margin: 2rem auto;}
	.m_1 ul{width: 100%;margin: 0.6rem auto 0rem;}
	.m_1 ul li{width: 90%;margin:1rem auto;border-radius: 6px;box-shadow: 0px 0px 20px rgba(0,0,0,0.1);overflow: hidden;cursor: pointer;transition: 0.3s all;}
	.m_1 ul li i{width: 100%;margin: 0px auto -5px;display: block;}
	.m_1 ul li i img{width: 100%;}
	.m_1 ul li p{color: #666;font-size: 0.8rem;text-align: center;padding: 16px;}
	.m_2{width: 100%;margin: 0px auto;padding: 2rem 0rem;background: #f9faf9;overflow: hidden;}
	.m_2 ul{width: 98%;margin: 2rem auto 0px}
	.m_2 ul li{width: 74%;border: 1px solid #C6D2EA;background: rgba(255,255,255,0.2);border-radius: 6px;padding: 20px;overflow: hidden;margin: 0.6rem auto 0rem;box-shadow: 0px 0px 20px rgba(0,0,0,0.08);}
	.m_2 ul li dt{margin-bottom: 10px;}
	.m_2 ul li dt h3{font-size: 1rem;margin-bottom: 10px;font-weight: bold;}
	.m_2 ul li dt p{font-size: 0.8rem;color: #666;font-weight: normal;}
	.m_2 ul li dl{box-sizing: border-box;}
	.m_2 ul li dd{font-size: 0.8rem;position: relative;padding-left: 20px;color: #666;line-height: 32px;display: inline-block;width: 40%;box-sizing: content-box;}
	.m_2 ul li dd::before{width: 6px;height: 6px;background: #becfed;content: "";position: absolute;left: 6px;top: 14px;border-radius: 50%;}
	.m_3{width: 100%;margin: 2rem auto 0px;overflow: hidden;}
	.m_4{width: 100%;margin: 0px auto;background: #f9faf9;padding: 0px 0px 2rem;overflow: hidden;}
	.m_4 .title{background: #fff url(../img/product/chain/bg1.png) top center no-repeat;overflow: hidden;padding: 1.2rem 0rem 2rem;width: 100%;}
	.m_4 .title h2{color: #fff;font-style: italic;margin: 0.8rem auto 0rem;}
	.m_4 .title p{color: #fff;font-size: 0.75rem;margin: 0rem 0rem 0.6rem}
	.m_4 .m{background: #fff;border-radius: 8px;box-shadow: 0px 0px 20px rgba(0,0,0,0.1);overflow: hidden;padding: 1.5rem 0rem;margin-top: -40px;}
	.m_4 .tit_2{text-align: center;margin: 0px auto;}
	.m_4 .tit_2 h3{font-size: 1.2rem;overflow: hidden;color: #fc8832;}
	.m_4 .tit_2 h3 i{display: inline-block;width: 2rem;height: 2rem;border-radius: 50%;background: #fc8832;color: #fff;line-height: 2rem;margin-right: 0.5rem;font-size: 1rem;}
	.m_4 .tit_2 p{font-size: 1rem;text-align: center;color: #333;margin: 10px auto 0px;width: 90%}
	.m_4 .ul_1{width: 100%;margin: 1rem auto 0px;}
	.m_4 .ul_1 li{width: 20%;float: left;text-align: center;cursor: pointer;}
	.m_4 .ul_1 li i{width: 3.5rem;height: 3.5rem;display: block;margin: 0px auto;border-radius: 50%;}
	.m_4 .ul_1 li i img{width: 100%;}
	.m_4 .ul_1 li p{font-size: 0.8;margin-top: 10px;color: #666;}
	.m_4 .simg{width: 100%;margin: 1rem auto;overflow: hidden;}
	.m_4 .simg img{width: 100%;}
	.m_4 .alink{width: 100%;margin: 0px auto;box-sizing: border-box;text-align: center;border-bottom: 1px solid #eee;padding-bottom: 1.2rem;margin-bottom: 1.2rem;}
	.m_4 .alink a{display: inline-block;margin: 10px 20px 0px;height: 2.2rem;line-height: 2.2rem;width: 6.8rem;}
	.m_4 .alink:last-child{border-bottom: 0px;padding-bottom: 0px;margin-bottom: 0px;}
	.m_5 .title{background: url(../img/product/chain/bg2.png) top center no-repeat;}
	.m_5 .tit_2 h3{color: #0082f1;}
	.m_5 .tit_2 h3 i{background: #0082f1;}
	.m_6 .title{background: url(../img/product/chain/bg1.png) top center no-repeat;}
	.m_4 .ul_2{width: 100%;margin: 10px auto 0px;}
	.m_4 .ul_2 li{width: 25%;float: left;text-align: center;overflow: hidden;cursor: pointer;transition: 0.3s all;}
	.m_4 .ul_2 li i{width: 70px;height: 70px;border-radius: 50%;display: block;margin: 20px auto 0px;}
	.m_4 .ul_2 li i img{width: 100%;}
	.m_4 .ul_2 li p{font-size: 14px;margin-top: 10px;color: #333;}
	.m_4 .ul_3{width:100%;margin: 10px auto 0rem;overflow: hidden;}
	.m_4 .ul_3 li{width: 49%;float: left;text-align: center;overflow: hidden;border-right: 1px solid #eee;border-bottom: 1px solid #eee;padding-bottom: 20px;cursor: pointer;}
	.m_4 .ul_3 li i{width: 80px;height: 80px;border-radius: 50%;display: block;margin: 20px auto 0px;}
	.m_4 .ul_3 li p{font-size: 14px;margin-top: 10px;color: #333;}
	.m_4 .ul_3 li:nth-child(2n){border-right: 0px;float: right;}
	.m_4 .ul_3 li:nth-child(7),.m_4 .ul_3 li:nth-child(8){border-bottom: 0px;}
	.m_7{width: 98%;margin: 2rem auto;overflow: hidden;box-sizing: border-box;text-align: center;}
	.m_7 ul{width: 100%;margin: 0.4rem auto 0px;overflow: hidden;}
	.m_7 ul li{width: 50%;margin: 10px 0px 0px;float: left;text-align: center;cursor: pointer;padding: 1rem 0px;transition: 0.3s all;}
	.m_7 ul li i{width: 80px;height: 80px;margin: 0px auto 20px;display: block;border-radius: 50%;}
	.m_7 ul li h3{font-size: 1rem;color: #333;margin-bottom: 10px;}
	.m_7 ul li p{font-size: 0.8rem;color: #666;padding: 0px 26px;}
	.m_7 ul li:hover{box-shadow: 0px 0px 10px rgba(0,0,0,0.1);}
	.m_7 ul li:nth-child(2n){float: right;}
	.m_7 .m_btn{display: inline-block;margin: 30px 20px 0px;height: 2.2rem;line-height: 2.2rem;width: 6.8rem;}
}