/* 
BEM 设计模式：
模块 (没有前缀，多个单词用 - 链接)
元素 (元素在模块之后，可以有多个层级，以 __ 连接)
修饰 (某元素、或者某模块特别的状态，必须有一个状态名和状态值，使用 _ 连接)
*/

html,
body {
  min-width: 1200px;
}

/* 页面顶部 */
.header {
  height: 80px;
  background-color: #f7f7f7;
}
.header__wrap {
  width: 1200px;
  height: 100%;
  margin: 0 auto;
  position: relative;
}
/* logo */
.header__logo {
  width: 100px;
  height: 38px;
  line-height: 38px;
  padding-left: 50px;
  font-size: 20px;
  background: url("../img/logo.png") left center no-repeat;
  background-size: 38px 38px;
  position: absolute;
  top: 50%;
  margin-top: -19px;
  left: 20px;
}
/* 导航栏 */
.header__nav {
  height: 38px;
  position: absolute;
  top: 50%;
  margin-top: -19px;
  right: 20px;
}
.header__nav-item {
  display: block;
  float: left;
  width: 30px;
  height: 38px;
  line-height: 38px;
  font-size: 14px;
  color: #292f35;
  padding-left: 48px;
  text-align: center;
  position: relative;
}
.header__nav-item:hover {
  color: #f01400;
}
.header__nav-item_status_active {
  color: #f01400;
}
.header__nav-item_custom_button {
  color: #f4f4f5;
  width: 90px;
  background: #07111b;
  border-radius: 3px;
  padding-left: 0px;
  margin-left: 48px;
}

/* 第一屏 */
.screen-1 {
  height: 800px;
  background: url("../img/bg-screen-1.png") no-repeat;
  background-size: cover;
  position: relative;
  overflow: hidden;
}
.screen-1__heading {
  color: #4d555d;
  font-size: 46px;
  padding-top: 152px;
  text-align: center;
}
.screen-1__heading b {
  color: #f01400;
}
.screen-1__phone {
  width: 1375px;
  height: 305px;
  background: url("../img/screen-1-phone.png") no-repeat;
  position: absolute;
  left: 50%;
  margin-left: -687px;
  bottom: 180px;
  z-index: 2;
}
.screen-1__shadow {
  width: 1233px;
  height: 411px;
  background: url("../img/screen-1-shadow.png") no-repeat;
  position: absolute;
  left: 50%;
  margin-left: -616px;
  bottom: 20px;
  z-index: 1;
  opacity: 0.8;
}

/* 第二屏 */
.screen-2 {
  height: 800px;
  background: #fafafa;
  position: relative;
  overflow: hidden;
}
.screen-2__heading {
  color: #f01400;
  font-size: 46px;
  padding-top: 96px;
  text-align: center;
}
.screen-2__sub-heading {
  color: #2c3137;
  font-size: 14px;
  line-height: 28px;
  padding-top: 25px;
  text-align: center;
}
.screen-2__phone {
  width: 928px;
  height: 873px;
  background: url("../img/screen-2-phone.png") no-repeat center;
  position: absolute;
  left: 50%;
  margin-left: -464px;
  bottom: -345px;
}
.screen-2__point {
  width: 108px;
  padding-right: 112px;
  line-height: 22px;
  font-size: 22px;
  color: #4d555d;
  background: url("../img/icon-point-right.png") no-repeat center right;
  position: absolute;
}
.screen-2__point_custom_right {
  padding-left: 112px;
  padding-right: 0;
  background: url("../img/icon-point-left.png") no-repeat center left;
}
.screen-2__point_i_1 {
  top: 150px;
  left: -164px;
}
.screen-2__point_i_2 {
  top: 30px;
  right: 130px;
}
.screen-2__point_i_3 {
  top: 330px;
  right: 30px;
}

/* 第三屏 */
.screen-3 {
  height: 800px;
  background: url("../img/bg-screen-3.png") no-repeat;
  background-size: cover;
}
.screen-3__wrap {
  width: 1200px;
  height: 100%;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}
.screen-3__heading {
  padding-top: 94px;
  padding-left: 5px;
  color: #fff;
  font-size: 46px;
  text-align: left;
}
.screen-3__sub-heading {
  color: #fff;
  font-size: 14px;
  line-height: 28px;
  text-align: left;
  padding-top: 25px;
  padding-left: 5px;
}
.screen-3__phone {
  width: 729px;
  height: 900px;
  background: url("../img/screen-3-phone.png") no-repeat;
  position: absolute;
  top: 195px;
  right: 0;
}
.screen-3__features {
  width: 320px;
  height: 280px;
  position: absolute;
  top: 395px;
  left: 0;
  padding-left: 5px;
}
.screen-3__features__item {
  width: 138px;
  height: 118px;
  border: 1px solid #cb7173;
  box-sizing: border-box;
  border-radius: 3px;
  margin: 0 20px 20px 0;
  float: left;
  color: #fff;
  text-align: center;
  cursor: pointer;
}
.screen-3__features__item__number {
  height: 36px;
  line-height: 36px;
  font-size: 36px;
  padding: 28px 0 7px 0;
}
.screen-3__features__item__desc {
  height: 14px;
  line-height: 14px;
  font-size: 14px;
}

/* 第四屏 */
.screen-4 {
  height: 800px;
  background: #fff;
  position: relative;
}
.screen-4__heading {
  color: #f01400;
  font-size: 46px;
  padding-top: 135px;
  text-align: center;
}
.screen-4__sub-heading {
  color: #464a4f;
  font-size: 14px;
  line-height: 28px;
  padding-top: 29px;
  text-align: center;
}
.screen-4__type {
  width: 1150px;
  height: 270px;
  position: absolute;
  top: 306px;
  left: 50%;
  margin-left: -575px;
}
.screen-4__type__item {
  width: 220px;
  height: 270px;
  float: left;
  margin-right: 90px;
  position: relative;
}
.screen-4__type__item:last-child {
  margin-right: 0px;
}
.screen-4__type__item_i_1 {
  background: url("../img/phone-1.png") top left no-repeat;
}
.screen-4__type__item_i_2 {
  background: url("../img/phone-2.png") top left no-repeat;
}
.screen-4__type__item_i_3 {
  background: url("../img/phone-3.png") top left no-repeat;
}
.screen-4__type__item_i_4 {
  background: url("../img/phone-4.png") top left no-repeat;
}
.screen-4__type__item__color {
  width: 100%;
  color: #2c3238;
  font-size: 14px;
  line-height: 14px;
  text-align: center;
  position: absolute;
  bottom: -44px;
}
.screen-4__type__item__storage {
  width: 100%;
  color: #a4a9a1;
  font-size: 12px;
  line-height: 12px;
  text-align: center;
  position: absolute;
  bottom: -66px;
}

/* 第五屏 */
.screen-5 {
  height: 800px;
  background: #d9dde1;
  position: relative;
  overflow: hidden;
}
.screen-5__bg {
  width: 100%;
  height: 433px;
  background: url("../img/bg-screen-5.png") center top no-repeat;
  position: absolute;
  bottom: 0px;
}
.screen-5__heading {
  color: #f01400;
  font-size: 46px;
  padding-top: 130px;
  text-align: center;
}
.screen-5__sub-heading {
  color: #464a4f;
  font-size: 14px;
  line-height: 28px;
  padding-top: 28px;
  text-align: center;
}

/* 立即购买 */
.screen-buy {
  height: 80px;
  padding: 120px 0;
  background: #2b333b url("../img/bg-screen-buy.png") center no-repeat;
  text-align: center;
}
.screen-buy__button {
  width: 240px;
  height: 80px;
  line-height: 80px;
  background: #f01414;
  font-size: 24px;
  color: #fff;
  text-align: center;
  border-radius: 3px;
  display: inline-block;
  transition: all 0.5s;
}
.screen-buy__button:hover {
  box-shadow: 0px 0px 10px rgba(255, 255, 255, 0.3);
}

/* 页面底部 */
.footer {
  height: 80px;
  line-height: 80px;
  text-align: center;
  font-size: 12px;
  color: #fff;
  background: #07111b;
}

/* 大纲菜单 */
.outline {
  position: fixed;
  padding: 5px 10px;
  top: 50%;
  transform: translate(0, -50%);
  right: 0;
  z-index: 3;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.outline__item {
  width: 40px;
  height: 30px;
  line-height: 30px;
  font-size: 14px;
  display: block;
  text-align: center;
  padding: 5px 0;
  color: #93999f;
  border-top: 1px solid #eee;
}
.outline__item:first-child {
  border: none;
}
.outline__item_status_active {
  color: #f01414;
}

/* 菜单滑动门 */
.header__nav-tip {
  position: absolute;
  width: 30px;
  height: 2px;
  bottom: 0;
  left: 0;
  background: #f01414;
  margin-left: 48px;
  transition: all 0.5s;
}