*{ padding:0; margin:0px;}
body{ font-family:"Microsoft Yahei"; width:640px; height:auto; margin:0 auto;}
.clear{clear:both}
.clearfix:before,.clearfix:after{content:"";display:table}
.clearfix:after{clear:both}
.clearfix{zoom:1}
.head{  background-color:#fff;}
.head_01{ background:url(https://png.pookcdn.net/mobile_image/sina_kstg/ks_01.jpg) no-repeat; }
.head_02{ background:url(https://png.pookcdn.net/mobile_image/sina_kstg/ks_02.jpg) no-repeat; }
.head_03{ background:url(https://png.pookcdn.net/mobile_image/sina_kstg/ks_03.jpg) no-repeat;}
.head_04{ background:url(https://png.pookcdn.net/mobile_image/sina_kstg/ks_04.jpg) no-repeat;}
.head_05{ background:url(https://png.pookcdn.net/mobile_image/sina_kstg/ks_05.jpg) no-repeat;}
.left{float:left;}
.right{float:right;}
.btn_android{ display:block; background:url(https://png.pookcdn.net/mobile_image/sina_kstg/btn_download.png) no-repeat;}
.down{ overflow:hidden;}
.down a{ display:block;}
.down a.iphone{background:url(https://png.pookcdn.net/mobile_image/sina_kstg/poker_ico.gif) no-repeat;}
.down a.android{ float:right; background:url(https://png.pookcdn.net/mobile_image/sina_kstg/btn_download_s.png) no-repeat;}
.service_text{background-color:#fff;text-align:center;color:#535353;}
.hotline{ margin:0 auto; border-bottom:1px #c5c5c5 dashed;height:1px;}
.desc_box{ background-color:#fff;text-align:center; margin:0 auto;}
.icon_conference{background:url(https://png.pookcdn.net/mobile_image/sina_kstg/feature_01.gif) 0 0 no-repeat;}
.icon_meet{background:url(https://png.pookcdn.net/mobile_image/sina_kstg/feature_02.gif) 0 0 no-repeat;}
.icon_physics{background:url(https://png.pookcdn.net/mobile_image/sina_kstg/feature_03.gif) 0 0 no-repeat;}
.icon_recommend{background:url(https://png.pookcdn.net/mobile_image/sina_kstg/feature_04.gif) 0 0 no-repeat;}
.icon_search{background:url(https://png.pookcdn.net/mobile_image/sina_kstg/feature_05.gif) 0 0 no-repeat;}
.ptitle{ color:#4b4b4b;}
.pcontent{ color:#4b4b4b;}
.wangye{ color:#038ded; text-align:center;}
.wangye a{ text-decoration:none;color:#038ded;} 
.wangye a:active{color:#038ded;}
.bottom{color:#8a8a8a;text-align:center;}




@media only screen and (min-width:0) and (max-width:359px){
.box{ width:320px; height:auto; }
.head{ width:320px; margin-top:5px;}
.head_01{  height:54px; background-size:320px 54px;}
.head_02{  height:54px; background-size:320px 54px;}
.head_03{  height:54px; background-size:320px 54px;}
.head_04{  height:54px; background-size:320px 54px;}
.head_05{  height:54px; background-size:320px 54px;}
.left{ margin-left:20px;}
.right{ margin-right:14px;}
.btn_android{  margin:20px auto;  width:135px; height:54px; background-size:135px 54px;}
.down{ width:235px; margin:35px auto;}
.down a.iphone{ margin-bottom: 7px;width:45px; height:45px; background-size:45px 45px;}
.down a.android{ width:115px; height:46px; background-size:115px 46px;}
.service_text{ margin:10px 0 23px;font-size:14px;}
.hotline{ width:235px;}

.desc_box{width:235px;height:176px;}
.desc_box .icon{ margin:35px auto;}
.icon_conference{width:63px;height:63px; background-size:63px 63px;}
.icon_meet{width:63px;height:63px; background-size:63px 63px;}
.icon_physics{width:63px;height:63px; background-size:63px 63px;}
.icon_recommend{width:63px;height:63px; background-size:63px 63px;}
.icon_search{width:63px;height:63px; background-size:63px 63px;}
.desc_text{margin:20px 0 30px;}
.ptitle{font-size:20px;margin-bottom:20px;font-weight:300;}
.pcontent{font-size:12px;}

.wangye{font-size:12px; margin-top:20px;}
.bottom{font-size:10px;margin:40px auto;}	
	

}
@media only screen and (min-width:360px) and (max-width:719px){
.box{ width:360px; height:auto; }
.head{ width:360px; margin-top:5px;}
.head_01{  height:61px; background-size:360px 61px;}
.head_02{  height:61px; background-size:360px 61px;}
.head_03{  height:61px; background-size:360px 61px;}
.head_04{  height:61px; background-size:360px 61px;}
.head_05{  height:61px; background-size:360px 61px;}
.left{ margin-left:24px;}
.right{ margin-right:18px;}
.btn_android{  margin:23px auto;  width:150px; height:60px; background-size:150px 60px;}
.down{ width:235px; margin:40px auto;}
.down a.iphone{ margin-bottom: 7px;width:50px; height:50px; background-size:50px 50px;}
.down a.android{ width:129px; height:51px; background-size:129px 51px;}
.service_text{ margin:10px 0 23px;font-size:14px;}
.hotline{ width:235px;}

.desc_box{width:235px;height:195px;}
.desc_box .icon{ margin:43px auto;}
.icon_conference{width:70px;height:70px; background-size:70px 70px;}
.icon_meet{width:70px;height:70px; background-size:70px 70px;}
.icon_physics{width:70px;height:70px; background-size:70px 70px;}
.icon_recommend{width:70px;height:70px; background-size:70px 70px;}
.icon_search{width:70px;height:70px; background-size:70px 70px;}
.desc_text{margin:20px 0 30px;}
.ptitle{font-size:20px;margin-bottom:20px;font-weight:300;}
.pcontent{font-size:12px;}

.wangye{font-size:12px; margin-top:20px;}
.bottom{font-size:12px;margin:40px auto;}

}
@media only screen and (min-width:720px){

.box{ width:720px; height:auto; }
.head{ width:720px; margin-top:10px;}
.head_01{  height:121px;}
.head_02{  height:121px;}
.head_03{  height:120px;}
.head_04{  height:121px;}
.head_05{  height:121px;}
.left{ margin-left:47px;}
.right{ margin-right:37px;}
.btn_android{  margin:45px auto;  width:300px; height:120px;}
.down{ width:470px; margin:80px auto;}
.down a.iphone{ margin-bottom: 15px;width:99px; height:99px;}
.down a.android{ width:258px; height:101px;}
.service_text{ margin-bottom:46px;margin-top:20px;font-size:28px;}
.hotline{ width:470px;}

.desc_box{width:470px;height:390px;}
.desc_box .icon{ margin:85px auto;}
.icon_conference{width:140px;height:140px;}
.icon_meet{width:140px;height:140px;}
.icon_physics{width:140px;height:140px;}
.icon_recommend{width:140px;height:140px;}
.icon_search{width:140px;height:140px;}
.desc_text{margin-top:40px;margin-bottom:60px;}
.ptitle{font-size:40px;margin-bottom:40px;font-weight:600;}
.pcontent{font-size:20px;}

.wangye{font-size:24px; margin-top:40px;}
.bottom{font-size:20px;margin:40px auto;}

}