.sub-nav {
 margin: 28px 0;
 color: #C3C4C4;
}

.sub-nav a:nth-child(1) {
 color: #000;
}

.sub-nav a:nth-child(2) {
 color: #C3C4C4;
}

.sub-nav>a:hover {
 color: #FF793F;
 text-decoration: underline;
}

#column-1 {
 padding: 20px 20px 27px 20px;
 background-color: #fff;
 display: flex;
 margin-bottom: 30px;
}

.column-1-img img {
 width: 420px;
}

.column-1-content {
 margin-left: 45px;
 width: 630px;
}

#column-1 .column-1-tit {
 text-overflow: -o-ellipsis-lastline;
 overflow: hidden;
 text-overflow: ellipsis;
 display: -webkit-box;
 -webkit-line-clamp: 2;
 line-clamp: 2;
 -webkit-box-orient: vertical;
 line-height: 24px;
 font-size: 16px;
 margin-bottom: 15px;
}

#column-1 .column-1-tips {
 margin-bottom: 15px;
}

#column-1 .column-1-tips>span {
 display: inline-block;
 height: 26px;
 line-height: 26px;
 color: #757575;
}

#column-1 .column-1-tips span:nth-child(1) {
 padding: 0 10px;
 background-color: #F7EACB;
 color: #aa9051;
 border-radius: 5px;
}

#column-1 .column-1-tips span:nth-child(2) {
 margin-left: 28px;
}

#column-1 .column-1-tips span:nth-child(2) img {
 vertical-align: middle;
 margin-right: 10px;
}

#column-1 .column-1-name {
 overflow: hidden;
 text-overflow: ellipsis;
 white-space: nowrap;
 font-size: 14px;
 color: #999;
 margin-bottom: 20px;
}

#column-1 .column-1-price {
 margin-bottom: 20px;
}

#column-1 .column-1-price .column-1-now-price {
 font-size: 30px;
 color: red;
}

#column-1 .column-1-price .column-1-original-price {
 margin-left: 10px;
 font-size: 14px;
 color: #aaa;
 text-decoration: line-through;
}

#column-1 .column-1-price .column-1-info-tips {
 color: #fff;
 font-size: 13px;
 line-height: 23px;
 height: 23px;
 margin-left: 10px;
 background-color: red;
 display: inline-block;
 padding: 0 6px;
 vertical-align: super;
}

.column-1-btn>a:nth-child(1) {
 color: #fff;
 font-size: 16px;
 display: inline-block;
 text-align: center;
 width: 150px;
 height: 38px;
 line-height: 38px;
 border-radius: 5px;
 transition: all 1s;
 background: -webkit-linear-gradient(left, #FF793F, #FC654E);
 /* Safari 5.1 - 6.0 */
 background: -o-linear-gradient(right, #FF793F, #FC654E);
 /* Opera 11.1 - 12.0 */
 background: -moz-linear-gradient(right, #FF793F, #FC654E);
 /* Firefox 3.6 - 15 */
 background: linear-gradient(to right, #FF793F, #FC654E);
 /* 标准的语法（必须放在最后） */
}

.column-1-btn>a:nth-child(1):hover {
 background: -webkit-linear-gradient(left, #FC654E, #FF793F);
 /* Safari 5.1 - 6.0 */
 background: -o-linear-gradient(right, #FC654E, #FF793F);
 /* Opera 11.1 - 12.0 */
 background: -moz-linear-gradient(right, #FC654E, #FF793F);
 /* Firefox 3.6 - 15 */
 background: linear-gradient(to right, #FC654E, #FF793F);
 /* 标准的语法（必须放在最后） */
}

.column-1-btn>a:nth-child(2) {
 margin-left: 24px;
 color: #f4d8b5;
 font-size: 16px;
 display: inline-block;
 text-align: center;
 min-width: 150px;
 padding: 0 10px;
 height: 38px;
 line-height: 38px;
 border-radius: 5px;
 transition: all 1s;
 background: -webkit-linear-gradient(left, #373949, #373949);
 /* Safari 5.1 - 6.0 */
 background: -o-linear-gradient(right, #373949, #373949);
 /* Opera 11.1 - 12.0 */
 background: -moz-linear-gradient(right, #373949, #373949);
 /* Firefox 3.6 - 15 */
 background: linear-gradient(to right, #373949, #373949);
 /* 标准的语法（必须放在最后） */
}

.column-1-btn>a:nth-child(2):hover {
 background: -webkit-linear-gradient(left, #373949, #373949);
 /* Safari 5.1 - 6.0 */
 background: -o-linear-gradient(right, #373949, #373949);
 /* Opera 11.1 - 12.0 */
 background: -moz-linear-gradient(right, #373949, #373949);
 /* Firefox 3.6 - 15 */
 background: linear-gradient(to right, #373949, #373949);
 /* 标准的语法（必须放在最后） */
}

.column-1-btn>a:nth-child(2) img {
 margin-right: 8px;
 vertical-align: unset;
}

.column-1-more {
 display: flex;
 text-align: center;
}

.column-1-more-collection {
 background: url('https://bdn.135editor.com/files/201906/Rs8MaYSU2Fy2.png') no-repeat center top;
 background-size: unset;
 height: 56px;
 width: 32px;
 line-height: 90px;
 color: #aaa;
}

.column-1-more-share {
 margin-left: 20px;
 background: url('https://bdn.135editor.com/files/201906/YIYtCEkLHGF3.png') no-repeat center top;
 background-size: unset;
 height: 56px;
 width: 32px;
 line-height: 90px;
 color: #aaa;
 position: relative;
 cursor: pointer;
}

.column-1-more-share-box {
 position: absolute;
 top: -54px;
 right: -66px;
 width: 120px;
 height: 45px;
 line-height: 45px;
 background-color: #fff;
 border-radius: 10px;
 display: none;
 z-index: 999;
 box-shadow: 0 0 15px #3333331f;
 padding-top: 5px;
}

.column-1-more-share-box:after {
 width: 30px;
 height: 30px;
 position: absolute;
 content: '';
 background-color: #fff;
 top: 16px;
 right: 68px;
 transform: rotate(135deg);
 z-index: -1;
 visibility: visible;
}

.column-1-more-share-box>.bds_tsina {
 display: inline-block;
 width: 32px;
 height: 32px;
 line-height: 32px;
 margin: 0 10px;
 float: none;
 padding: 0;
 font-size: 16px;
 background: url('https://bdn.135editor.com/files/201906/9ad7a47b63263e8e94ab87ed4b5a9b7a.png') no-repeat center;
 background-size: contain;
}

.column-1-more-share-box>.bds_weixin {
 display: inline-block;
 width: 32px;
 height: 32px;
 line-height: 32px;
 margin: 0 10px;
 float: none;
 padding: 0;
 font-size: 16px;
 background: url('https://bdn.135editor.com/files/201906/35b1b7c0232b0171a514004692b8097d.png') no-repeat center;
 background-size: contain;
}

.bd_weixin_popup {
 box-shadow: 0 0 15px #6c757d;
}

.column-1-more-collection.on,
.column-1-more-collection:hover {
 background: url('https://bdn.135editor.com/files/201906/5555555555.png') no-repeat center top;
 color: #FF793F;
}

.column-1-more-share:hover {
 background: url('https://bdn.135editor.com/files/201906/22222222222.png') no-repeat center top;
 color: #FF793F;
}

#column-2 {}

#column-2 .sub-menu {
 padding: 0 34px 0px 34px;
 border-bottom: 1px solid #eee;
 background-color: #fff;
}

#column-2 .sub-menu>a {
 color: #333;
 display: inline-block;
 margin-right: 46px;
 font-size: 16px;
 height: 52px;
 line-height: 52px;
 position: relative;
}

#column-2 .sub-menu>a:after {
 position: absolute;
 left: 1px;
 right: 1px;
 bottom: -1px;
 z-index: 1001;
 height: 1px;
 content: '';
 background-color: #ff7c2c;
 -webkit-transform: scaleX(0);
 -ms-transform: scaleX(0);
 transform: scaleX(0);
 -webkit-transition: -webkit-transform 0.3s;
 transition: -webkit-transform 0.3s;
 transition: transform 0.3s;
 transition: transform 0.3s, -webkit-transform 0.3s;
}

#column-2 .sub-menu .on:after,
#column-2 .sub-menu>a:hover:after {
 -webkit-transform: scaleX(1);
 -ms-transform: scaleX(1);
 transform: scaleX(1);
}

#column-2 .sub-menu .on,
#column-2 .sub-menu>a:hover {
 color: #ff7c2c;
}

#buy-QA {
 background-color: #fff;
 margin-bottom: 54px;
}

#buy-QA>h2 {
 color: #333;
 padding: 0 34px 0px 34px;
 font-size: 16px;
 height: 52px;
 line-height: 52px;
 margin: 0;
 border-bottom: 1px solid #eee;
}

.buy-QA-content {
 padding: 24px 34px;
}

.buy-QA-single {
 margin-bottom: 28px;
}

.buy-QA-single>p:nth-child(1) {
 font-size: 16px;
 margin-bottom: 4px;
}

.buy-QA-single>p:nth-child(2) {
 color: #aaa;
 margin-bottom: 0;
}

#column-3 {
 background-color: #fff;
}

#column-3>h2 {
 color: #333;
 padding: 0 34px 0px 34px;
 font-size: 16px;
 height: 52px;
 line-height: 52px;
 margin: 0;
 border-bottom: 1px solid #eee;
}

.column-3-content {
 padding: 0 14px 20px;
}

.column-3-single {
 padding: 15px 20px;
 border-bottom: 1px solid #eee;
}

.column-3-single:hover .column-3-title {
 color: #ff7c2c;
}

.column-3-single:last-child {
 border-bottom: none;
}

.column-3-img {
 margin-bottom: 10px;
}

.column-3-img img {
 display: none;
 width: 292px;
}

.column-3-title {
 white-space: nowrap;
 overflow: hidden;
 text-overflow: ellipsis;
 color: #333;
}

/* 主体内容-s */
#sub-menu-main {
 padding: 24px 34px 101px 34px;
 margin-bottom: 28px;
 background-color: #fff;
}

#sub-menu-main>div {
 display: none;
}

#sub-menu-main>.on {
 display: block;
}

.course-list-title {
 font-size: 14px;
 color: #333;
 font-weight: bold;
 line-height: 40px;
 height: 40px;
 overflow: hidden;
 white-space: nowrap;
 text-overflow: ellipsis;
 padding: 0 13px 0 36px;
 background-color: #F4F4F4;
 margin-top: 26px;
 cursor: pointer;
 background: #F4F4F4 url('https://bdn.135editor.com/files/201906/XQMwfGVeGP2w.png') no-repeat 13px center;
 background-size: unset;
}

.course-list-title:hover {
 background: #F4F4F4 url('https://bdn.135editor.com/files/201906/9vNzyrs96QLM.png') no-repeat 13px center;
}

.course-list-single,
.course-list-single-mp3 {
 padding: 20px 25px 20px 0;
 border-bottom: 1px dashed #eee;
}

.course-list-info,
.course-list-info-mp3 {
 overflow: hidden;
 color: #444;
}

.course-list-info>img,
.course-list-info-mp3>img {
 vertical-align: inherit;
 margin-right: 13px;
}

.course-list-info:hover,
.course-list-info-mp3:hover {
 color: #ff7c2c;
}

.course-list-info>span,
.course-list-info-mp3>span {
 display: inline-block;
 overflow: hidden;
 white-space: nowrap;
 text-overflow: ellipsis;
 max-width: 430px;
}

.course-list-info>a,
.course-list-info-mp3>a {
 display: inline-block;
 margin-left: 15px;
 border: 1px solid #ff7c2c;
 height: 26px;
 line-height: 26px;
 padding: 0 10px;
 text-align: center;
 border-radius: 30px;
 color: #ff7c2c;
 vertical-align: super;
 visibility: hidden;
}

.course-list-info>a:hover,
.course-list-info-mp3>a:hover {
 background-color: #ff7c2c;
 color: #fff;
}

.course-list-info>i,
.course-list-info-mp3>i {
 font-style: normal;
 float: right;
 color: #aaa;
}

.course-message-1 {
 padding-bottom: 10px;
 max-height: 600px;
 overflow-y: auto;
}

.course-message-single {
 margin-bottom: 22px;
}

.course-message-name {
 font-size: 14px;
 color: #757575;
 margin-bottom: 15px;
}

.course-message-name>span {
 font-size: 12px;
 color: #aaa;
 vertical-align: bottom;
 margin-left: 14px;
}

.course-message-comment {
 border-radius: 10px;
 padding: 15px 16px 22px;
 background-color: #F5F6F7;
 color: #333;
 font-size: 14px;
 line-height: 30px;
 letter-spacing: 1px;
 position: relative;
 word-break: break-all;
}

.course-message-comment:before {
 content: " ";
 background-color: #F5F6F7;
 position: absolute;
 width: 20px;
 height: 20px;
 top: -3px;
 transform: rotate(135deg);
}

.course-reply-single {
 margin-bottom: 22px;
}

.course-reply-name {
 font-size: 14px;
 color: #757575;
 margin-bottom: 15px;
 text-align: right;
}

.course-reply-name>span {
 font-size: 12px;
 color: #aaa;
 vertical-align: bottom;
 margin-left: 14px;
}

.course-reply-comment {
 border-radius: 10px;
 padding: 15px 16px 22px;
 background-color: #e6e6e6;
 color: #333;
 font-size: 14px;
 line-height: 30px;
 letter-spacing: 1px;
 position: relative;
 word-break: break-all;
}

.course-reply-comment:before {
 content: " ";
 background-color: #e6e6e6;
 position: absolute;
 width: 20px;
 height: 20px;
 top: -3px;
 right: 20px;
 transform: rotate(135deg);
}

.course-message-2-solid {
 border-bottom: 1px solid #eee;
}

.course-message-3 {
 padding-top: 30px;
}

.course-message-3 h2 {
 font-size: 15px;
 color: #333;
 font-weight: 700;
 height: 58px;
 line-height: 58px;
}

.course-message-my-comment>textarea {
 width: 100%;
 min-height: 184px;
 padding: 10px;
 border: 1px solid #eee;
 color: #333;
 word-break: break-all;
 outline: none;
}

.course-message-3-count {
 height: 28px;
 line-height: 28px;
 font-size: 14px;
 color: #333;
 text-align: right;
 margin-bottom: 10px;
}

.course-message-3-num {
 color: #ff7c2c;
}

.course-message-3-submit {
 text-align: right;
}

.course-message-3-submit>i {
 color: #757575;
 font-style: normal;
 cursor: pointer;
}

.course-message-3-submit>i>em {
 width: 16px;
 height: 16px;
 display: inline-block;
 background-color: #F5F6F7;
 margin-right: 6px;
 border-radius: 50%;
 vertical-align: middle;
 border: 1px solid #eee;
}

.course-message-3-submit>i>.on {
 background-color: #ff7c2c;
}

.course-message-3-submit>span {
 cursor: pointer;
 height: 30px;
 line-height: 30px;
 display: inline-block;
 width: 78px;
 text-align: center;
 color: #fff;
 font-size: 14px;
 border-radius: 5px;
 background-color: #ff7c2c;
 margin-left: 20px;
}

.course-message-3-submit>span:hover {
 box-shadow: 5px 10px 15px #e8eaec;
 transform: translateY(-1px);
}

.course-message-login {
 width: 100%;
 height: 90px;
 border: 1px solid #ff763d;
 border-radius: 7px;
 position: relative;
}

.course-message-login-msg {
 position: absolute;
 left: 50%;
 width: 120px;
 margin-left: -60px;
 height: 48px;
 line-height: 24px;
 top: 20px;
 text-align: center;
}

.course-discount-single {
 padding: 15px 15px 0px 15px;
 background-color: #F9F9F9;
 margin-bottom: 28px;
}

.course-discount-title {
 font-weight: bold;
 font-size: 16px;
 line-height: 16px;
 color: #000;
 margin-bottom: 20px;
 letter-spacing: 1px;
}

.course-discount-goods {
 display: flex;
 justify-content: space-between;
 align-items: center;
}

.course-discount-goods-1 {
 width: 150px;
}

.course-discount-goods-add {
 padding: 0 10px;
 height: 160px;
 line-height: 160px;
}

.course-discount-goods-2 {
 width: 330px;
}

.course-discount-goods-3 {
 text-align: center;
 word-break: break-all;
}

.course-discount-goods-single {
 display: inline-block;
 margin-right: 6px;
 background-color: #fff;
 border: 1px solid #eee;
 margin-bottom: 15px;
}

.course-discount-goods-single:hover {
 box-shadow: 0 10px 15px #3333331f;
 transform: translateY(-5px);
}

.course-discount-img {
 margin-bottom: 5px;
}

.course-discount-img img {
 width: 150px;
 vertical-align: middle;
}

.course-discount-tit {
 font-size: 12px;
 color: #222;
 height: 36px;
 line-height: 18px;
 text-overflow: -o-ellipsis-lastline;
 overflow: hidden;
 text-overflow: ellipsis;
 display: -webkit-box;
 -webkit-line-clamp: 2;
 line-clamp: 2;
 -webkit-box-orient: vertical;
 word-break: break-all;
 margin-bottom: 10px;
 width: 150px;
 padding: 0 5px;
}

.course-discount-price {
 font-size: 16px;
 line-height: 16px;
 color: red;
 margin-bottom: 15px;
 word-break: break-all;
 width: 150px;
 padding: 0 5px;
}

.course-discount-msg {
 font-size: 14px;
 color: #757575;
 margin-bottom: 22px;
 width: 130px;
}

.course-discount-now-price {
 font-size: 24px;
 color: red;
 margin-bottom: 5px;
 width: 130px;
}

.course-discount-original-price {
 color: #aaa;
 font-size: 14px;
 margin-bottom: 20px;
 text-decoration: line-through;
 width: 130px;
}

.course-discount-more {
 display: block;
 width: 100px;
 height: 30px;
 line-height: 30px;
 font-size: 14px;
 color: #ff7c2c;
 background-color: #fff;
 border-radius: 5px;
 border: 1px solid #ff7c2c;
 margin: 0 auto;
}

.course-discount-more:hover {
 color: #fff;
 background-color: #ff7c2c;
}

.course-discount-none {
 display: flex;
 justify-content: center;
 align-items: center;
 height: 550px;
}

/* 主体内容-e */
/* MP3音频课程-s */
#audio {
 position: fixed;
 left: 0;
 bottom: 0;
 z-index: 999;
 width: 100%;
 display: none;
}

.audio-close {
 position: absolute;
 top: 5px;
 left: 20px;
 color: #fff;
 cursor: pointer;
}

.audio-close:hover {
 color: #ff7c2c;
}

.prism-player {
 background-color: rgba(0, 0, 0, .75);
}

.audio-name {
 background-color: rgba(0, 0, 0, .75);
 font-size: 16px;
 line-height: 36px;
 height: 26px;
 color: #fff;
 text-align: center;
}

/* MP3音频课程-e */
#pay-code-mode {
 position: fixed;
 top: 0;
 left: 0;
 width: 100%;
 height: 100%;
 background: rgba(0, 0, 0, .5);
 display: none;
 z-index: 9999999;
 cursor: pointer;
 text-align: center;
}

.pay-code-box {
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -50%);
 background: #fff;
 border-radius: 16px;
/*  box-shadow: 0 0 15px 2px #ff7c2c; */
 padding: 35px;
 min-width: 370px;
 font-size: 17px;
 cursor: default;
}

.pay-code-btn {
 text-decoration: underline;
 cursor: pointer;
}

.pay-code-pic {
 position: relative;
}

.pay-code-pic .img1 {
 width: 160px;
}

.pay-code-pic .img2 {
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -50%);
 background: rgba(0, 0, 0, .8);
 cursor: pointer;
 display: none;
}

.pay-code-pic .img2 img {
 display: block;
 width: 160px;
 height: 160px;
}

.pay-code-pic .img2:hover img {
 animation: rot 3s linear 0s infinite normal;
}

@keyframes rot {
 from {
  transform: rotate(0);
 }

 to {
  transform: rotate(360deg);
 }
}

.coupon-box {
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -50%);
 background-color: rgba(0, 0, 0, .75);
 border-radius: 16px;
 box-shadow: 0 0 8px #e8eaec;
 padding: 35px;
 width: 800px;
 height: 600px;
 font-size: 14px;
 cursor: default;
 color: #fff;
 display: none;
}

.coupon-box h1 {
 color: #fff;
}

.coupon-card-box {
 overflow-y: auto;
 max-height: 400px;
}

.no-coupon {
 display: block;
 margin: 113px auto 0;
}

.coupon-card {
 border-radius: 6px;
 overflow: hidden;
 display: flex;
 transition: all .1s;
 background-color: #fff;
 cursor: pointer;
 line-height: 1.5em;
}

.coupon-card.disable-coupon-card {
 cursor: not-allowed;
}

.coupon-card.disable-coupon-card .coupon-left {
 background: #999;
}

.coupon-card.disable-coupon-card .coupon-3 {
 color: #333;
}

.select-coupon-card:hover {
 box-shadow: 0 0 8px #e8eaec;
}

.coupon-card.active .coupon-left {
 background: -webkit-linear-gradient(120deg, #EF5763, #FB8843);
 background: -o-linear-gradient(120deg, #EF5763, #FB8843);
 background: -moz-linear-gradient(120deg, #EF5763, #FB8843);
 background: linear-gradient(120deg, #EF5763, #FB8843);
}

.coupon-card.active .coupon-active {
 display: block;
}

.coupon-close {
 position: absolute;
 right: 10px;
 top: 10px;
 width: 60px;
 height: 40px;
 font-size: 18px;
 cursor: pointer;
}

.coupon-close:hover {
 text-shadow: 0 0 10px #fff;
 transform: scale(1.2);
}

.coupon-left {
 padding-top: 10px;
 text-align: center;
 width: 40%;
 height: 90px;
 border-radius: 6px;
 background: -webkit-linear-gradient(120deg, #FB8843, #EF5763);
 background: -o-linear-gradient(120deg, #FB8843, #EF5763);
 background: -moz-linear-gradient(120deg, #FB8843, #EF5763);
 background: linear-gradient(120deg, #FB8843, #EF5763);
}

.coupon-1 {
 color: #fff;
 font-size: 18px;
}

.coupon-1>i {
 font-style: normal;
}

.coupon-2 {
 color: #fff;
 font-size: 12px;
}

.coupon-3 {
 color: #9e373b;
}

.coupon-right {
 text-align: center;
 color: #999;
 width: 60%;
 padding-top: 20px;
 position: relative;
}

.coupon-active {
 display: none;
 position: absolute;
 bottom: 0;
 right: 0;
}

.coupon-user-btn {
 position: absolute;
 bottom: 40px;
 left: 0;
 width: 100%;
}

.coupon-user-true {
 background: #ff7c2c;
 padding: 5px 10px;
 border-radius: 6px;
 letter-spacing: 1px;
 cursor: pointer;
 font-size: 18px;
}

.coupon-user-true:hover {
 text-shadow: 0 0 10px #e8eaec;
}

.buy-the-course {
 cursor: pointer;
}