.scale:hover {
    transform: scale(1.1, 1.1);
}

nav {
    z-index: 100;
    position: relative;
    width: 100%;
    background-color: #060606;
}

    nav .nav-content {
        width: 1300px;
        height: 70px;
    }

        nav .nav-content img {
            max-height: 40px;
        }

    nav .nav-select {
        cursor: pointer;
        margin: 0 30px 0 80px;
        font-size: 16px;
        color: #fff;
        width: 150px;
        height: 30px;
        text-align: center;
        overflow: hidden;
    }

        nav .nav-select .select-arrows {
            transform: rotate(0deg);
            transition: all 0.3s;
        }

        nav .nav-select:hover {
            overflow: visible;
        }

            nav .nav-select:hover .select-arrows {
                transform: rotate(180deg);
            }

        nav .nav-select .select-item {
            width: 150px;
            height: 30px;
            font-size: 16px;
            line-height: 30px;
        }

        nav .nav-select .select-menu {
            width: 150px;
            font-size: 14px;
            background-color: #fff;
            overflow: hidden;
            border-radius: 5px;
            box-shadow: 0 0 5px #e9e9e9;
            color: #060606;
        }

            nav .nav-select .select-menu .menu-item {
                display: block;
                line-height: 35px;
                color: #333;
            }

                nav .nav-select .select-menu .menu-item:hover {
                    color: #fff;
                    background-color: #e0413e;
                }

    nav .nav-menu {
        margin-left: 60px;
        height: 70px;
        color: #fff;
    }

        nav .nav-menu .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            cursor: pointer;
            font-size: 16px;
            width: 90px;
            height: 70px;
            text-align: center;
            line-height: 70px;
            position: relative;
            color: white;
        }

            nav .nav-menu .nav-item::after {
                content: ' ';
                width: 35px;
                height: 3px;
                position: absolute;
                bottom: 0;
            }

            nav .nav-menu .nav-item:hover {
                color: #e0413e;
            }

                nav .nav-menu .nav-item:hover::after {
                    background-color: #e0413e;
                }

        nav .nav-menu .nav-item_active {
            color: #e0413e;
        }

            nav .nav-menu .nav-item_active::after {
                background-color: #e0413e;
            }

.head-content {
    width: 1300px;
    height: 900px;
}

.head-video {
    z-index: 10;
    width: 1140px;
    height: 500px;
    background: rgba(0, 0, 0, 0.38);
}

    .head-video .video-content {
        width: 1120px;
        height: 500px;
        background: #1b1b1b;
        margin: 10px;
    }

    .head-video .video-nav {
        width: 780px;
        text-align: center;
        line-height: 49px;
        font-size: 16px;
        height: 45px;
        color: #fff;
        font-size: 20px;
        font-weight: bold
    }

        .head-video .video-nav::-webkit-scrollbar {
            width: 0px
        }

        .head-video .video-nav .nav-item {
            cursor: pointer;
            text-align: center;
            line-height: 49px;
            font-size: 16px;
            color: #fff;
            width: 130px;
            height: 45px;
            transition: all 0.1s;
        }

            .head-video .video-nav .nav-item:hover {
                font-size: 20px;
                font-weight: bold;
                background-color: #e0413e;
            }

        .head-video .video-nav .nav-item_active {
            font-size: 20px;
            font-weight: bold;
            background-color: #e0413e;
        }

    .head-video .video-select {
        z-index: 10;
        width: 250px;
        height: 35px;
        margin-right: 10px;
        overflow: hidden
    }

        .head-video .video-select .select-arrows {
            transform: rotate(0deg);
            transition: all .3s;
            width: 15px
        }

        .head-video .video-select:hover {
            overflow: visible
        }

            .head-video .video-select:hover .select-arrows {
                transform: rotate(180deg)
            }

        .head-video .video-select .select-item {
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 10px;
            width: 250px;
            height: 35px;
            border: 1px solid #404040;
            color: #fff;
            background: #f92b2b
        }

        .head-video .video-select .select-menu {
            width: 200px;
            font-size: 14px;
            background-color: #fff;
            overflow: hidden;
            border-radius: 5px;
            color: #060606
        }

            .head-video .video-select .select-menu .menu-item {
                cursor: pointer;
                text-align: center;
                line-height: 35px
            }

                .head-video .video-select .select-menu .menu-item:hover {
                    color: #fff;
                    background-color: #e0413e
                }

    .head-video .video-src {
        width: 780px;
        height: 400px;
        background-color: #ccc;
    }

    .head-video .video-course {
        flex-grow: 1;
        height: 400px;
        background-color: #333;
        overflow-y: auto;
    }

        .head-video .video-course .course_play {
            padding: 0 60px 0 40px;
            height: 45px;
            background: #252525;
        }

            .head-video .video-course .course_play > .txt {
                overflow: hidden;
                text-overflow: ellipsis;
                white-space: nowrap;
                width: 150px;
                height: 14px;
                line-height: 14px;
                font-size: 13px;
                font-weight: 400;
                color: #00deff;
                cursor: pointer;
            }

            .head-video .video-course .course_play > .otxt {
                overflow: hidden;
                text-overflow: ellipsis;
                white-space: nowrap;
                width: 220px;
                height: 14px;
                line-height: 14px;
                font-size: 13px;
                font-weight: 400;
                color: #fff;
                cursor: pointer;
            }

            .head-video .video-course .course_play > .play {
                height: 14px;
                line-height: 14px;
                font-size: 13px;
                font-weight: 400;
                color: #00deff;
            }

        .head-video .video-course .course_title {
            padding: 0 60px 0 20px;
            height: 45px;
            background: #333;
        }

            .head-video .video-course .course_title > .txt {
                width: 220px;
                overflow: hidden;
                text-overflow: ellipsis;
                white-space: nowrap;
                line-height: 14px;
                font-size: 14px;
                font-weight: 800;
                color: #fff;
            }

            .head-video .video-course .course_title > .arrows {
                width: 12px;
            }

    .head-video .video-foot {
        position: relative;
        font-size: 22px;
        line-height: 55px;
        height: 55px;
        background-color: #fff;
    }

        .head-video .video-foot > .tag {
            padding-left: 50px;
            color: #f54e23;
        }

        .head-video .video-foot > .btn-consulted {
            cursor: pointer;
            position: absolute;
            right: 180px;
            text-align: center;
            line-height: 45px;
            font-size: 20px;
            width: 160px;
            height: 45px;
            background: #23b8ff;
            border-radius: 3px;
            color: #fff;
        }

        .head-video .video-foot > .btn-apply {
            cursor: pointer;
            position: absolute;
            right: 10px;
            text-align: center;
            line-height: 45px;
            font-size: 20px;
            width: 160px;
            height: 45px;
            background: #ff681e;
            border-radius: 3px;
            color: #fff;
        }

.recommend {
    height: 55px;
    overflow: hidden;
}

    .recommend a {
        color: black;
    }

.jingpin {
    color: #e0413e;
}

.video-container {
    height: 400px;
}

.teachers .teachers_active {
    position: absolute;
    width: 320px;
  /*  height: 428px;*/
}