body,
html {
    background-color: #f2f2f2;
}

.course_container .nav {
    box-shadow: 0 5px 10px #f0f0f0;
    z-index: 10;
}

.course_container .options {
    padding: 25px 0 10px;
    width: 100%;
    background-color: #fff;
}

    .course_container .options .options-content {
        width: 1200px;
        background-color: #fff;
        border-bottom: 1px solid #eee;
        margin-bottom: 14px;
    }

    .course_container .options .options-nav .list {
        cursor: pointer;
        margin-right: 65px;
        font-size: 18px;
        font-weight: bold;
        color: #333;
    }

        .course_container .options .options-nav .list:hover {
            color: #0384fc;
        }

        .course_container .options .options-nav .list:after {
            margin-top: 10px;
            content: '';
            border-radius: 4px;
            right: auto;
            width: 25px;
            height: 3px;
        }

    .course_container .options .options-nav .active:after {
        background: #0384fc;
    }

    .course_container .options .options-exam,
    .course_container .options .options-subject,
    .course_container .options .options-type {
        width: 1200px;
        position: relative;
        margin: 0 auto;
        font-size: 14px;
        font-weight: 400;
        color: #555;
    }

        .course_container .options .options-exam .title,
        .course_container .options .options-subject .title,
        .course_container .options .options-type .title {
            width: 88px;
            flex-shrink: 0;
        }

        .course_container .options .options-exam .list,
        .course_container .options .options-subject .list,
        .course_container .options .options-type .list {
            margin-bottom: 6px;
            cursor: pointer;
            padding-right: 30px;
            position:relative;
        }

            .course_container .options .options-exam .list:hover,
            .course_container .options .options-subject .list:hover,
            .course_container .options .options-type .list:hover {
                color: #4f92f0;
            }

        .course_container .options .options-exam .active,
        .course_container .options .options-subject .active,
        .course_container .options .options-type .active {
            color: #4f92f0;
        }

        .course_container .options .options-exam > button,
        .course_container .options .options-subject > button,
        .course_container .options .options-type > button {
            cursor: pointer;
            position: absolute;
            right: 0;
            width: 100px;
            height: 28px;
            background: #ebf5fe;
            border-radius: 14px;
            font-size: 13px;
            font-weight: 400;
            color: #0384fc;
        }

.course_container main {
    margin-top: 20px;
    width: 1200px;
    padding-bottom: 20px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

    .course_container main .chunk {
        position: relative;
        width: 285px;
        background-color: #fff;
        padding: 30px 22px 19px;
        background-image: url(../images/course_bg.png);
        background-position: center center;
        background-size: 100% 100%;
        background-repeat: no-repeat;
        cursor: pointer;
    }

        .course_container main .chunk:hover {
            box-shadow: 0 0 5px #ccc;
        }

        .course_container main .chunk .title {
            height: 46px;
            font-size: 18px;
            font-weight: 400;
            color: #333;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            text-align: justify;
        }

        .course_container main .chunk .rank {
            margin-top: 15px;
            font-size: 12px;
            font-weight: 400;
            color: #999;
        }

        .course_container main .chunk .teacher {
            margin-top: 40px;
        }

        .course_container main .chunk .teacher-teacher {
            margin-right: 20px;
        }

            .course_container main .chunk .teacher-teacher > img {
                width: 40px;
                height: 40px;
                border-radius: 50%;
                background-color: #f2f2f2;
            }

            .course_container main .chunk .teacher-teacher > p {
                margin-top: 10px;
                font-size: 12px;
                font-weight: 400;
                color: #999;
            }

        .course_container main .chunk .price {
            margin-top: 15px;
            padding-top: 15px;
            border-top: 1px solid #eee;
        }

            .course_container main .chunk .price .val > span {
                font-size: 14px;
                font-weight: 400;
                color: #de3e29;
            }

            .course_container main .chunk .price .val .num {
                font-size: 20px;
            }

            .course_container main .chunk .price > button {
                cursor: pointer;
                text-align: center;
                width: 96px;
                height: 28px;
                background: #fff;
                border: 1px solid #b4dbff;
                border-radius: 14px;
                font-size: 12px;
                font-weight: 400;
                color: #0384fc;
                line-height: 27px;
            }

        .course_container main .chunk .liveStreaming {
            position: absolute;
            top: 0;
            left: 0;
            /*width: 50px;*/
            padding: 0 15px;
            height: 20px;
            background: #f5ebe1;
            border-radius: 0px 0px 10px 0px;
            font-size: 12px;
            font-weight: 400;
            color: #8c6f55;
        }

        .course_container main .chunk .price > button:hover {
            background: #0384fc;
            color: #fff;
            border: none;
        }


.course_container .main {
    /*padding-bottom: 46px;*/
    background-color:#fff;
}

    .course_container .main .main-menu {
        padding-top: 20px;
        width: 1200px;
        border-bottom: 1px solid #eee;
    }

        .course_container .main .main-menu .more {
            cursor: pointer;
            font-size: 14px;
            font-weight: 400;
            color: #999;
            line-height: 34px;
        }

    .course_container .main .main-nav {
        width: 1040px;
    }

        .course_container .main .main-nav .title {
            font-weight: bold;
            font-size: 20px;
            color: #333;
        }

        .course_container .main .main-nav .list {
            cursor: pointer;
            margin-left: 20px;
            padding: 5px 0;
            font-weight: 400;
            font-size: 14px;
        }

            .course_container .main .main-nav .list:hover {
                color: #0384fc;
            }

        .course_container .main .main-nav .active:after {
            margin-top: 10px;
            content: '';
            border-radius: 4px;
            right: auto;
            width: 38px;
            height: 3px;
            background: #0384fc;
        }


    .course_container .main .main-content-two {
        margin-top: 10px;
        width: 1200px;
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        grid-template-rows: 300px auto;
        grid-template-areas:
            'a a b c'
            'd e f c';
        gap: 10px;
        place-items: stretch stretch;
        padding: 0 18px;
    }

    .course_container .main .main-content-two .exhibition {
        grid-area: a;
        background-color: orange;
    }

    .course_container .main .main-content-two .course {
        width: 288px;
        height: 288px;
        background-color: #fff;
        padding: 30px 22px;
        position: relative;
        background-image: url('../images/course_bg.png');
        background-position: center center;
        background-size: 100% 100%;
        background-repeat: no-repeat;
        cursor: pointer;
    }

        .course_container .main .main-content-two .course .liveStreaming {
            position: absolute;
            top: 0;
            left: 0;
            /* width: 50px; */
            padding: 0 15px;
            height: 20px;
            background: #f5ebe1;
            border-radius: 0px 0px 10px 0px;
            font-size: 12px;
            font-weight: 400;
            color: #8c6f55;
        }

        .course_container .main .main-content-two .course .title {
            height: 46px;
            font-size: 18px;
            font-weight: 400;
            color: #333;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            text-align: justify;
        }

        .course_container .main .main-content-two .course .rank {
            margin-top: 15px;
            font-size: 12px;
            font-weight: 400;
            color: #999;
        }

        .course_container .main .main-content-two .course .teacher {
            /*margin-top: 50px;*/
            position: absolute;
            bottom: 70px;
        }

        .course_container .main .main-content-two .course .teacher-teacher {
            margin-right: 20px;
        }

            .course_container .main .main-content-two .course .teacher-teacher > img {
                width: 40px;
                height: 40px;
                border-radius: 50%;
                background-color: #f2f2f2;
            }

            .course_container .main .main-content-two .course .teacher-teacher > p {
                margin-top: 10px;
                font-size: 12px;
                font-weight: 400;
                color: #999;
                white-space: nowrap;
            }

        .course_container .main .main-content-two .course .price {
            margin-top: 15px;
            padding-top: 15px;
            border-top: 1px solid #eee;
            position: absolute;
            bottom: 16px;
            width: calc(100% - 38px);
        }

            .course_container .main .main-content-two .course .price .val > span {
                font-size: 14px;
                font-weight: 400;
                color: #de3e29;
            }

            .course_container .main .main-content-two .course .price .val .num {
                font-size: 20px;
            }

            .course_container .main .main-content-two .course .price > button {
                cursor: pointer;
                text-align: center;
                width: 96px;
                height: 28px;
                background: #fff;
                border: 1px solid #b4dbff;
                border-radius: 14px;
                font-size: 12px;
                font-weight: 400;
                color: #0384fc;
                line-height: 27px;
            }

    .course_container .main .main-content-two .module {
        width: 288px;
        grid-area: c;
        background-color: #fff;
    }

        .course_container .main .main-content-two .module .options {
            background-color: #f2f2f2;
            height: 160px;
            width: 100%;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            grid-template-rows: repeat(2, 1fr);
            gap: 1px;
            border-bottom: 1px solid #f2f2f2;
        }

            .course_container .main .main-content-two .module .options .option {
                position: relative;
                background-color: #fff;
            }


                .course_container .main .main-content-two .module .options .option > img {
                    width: 28px;
                    height: 28px;
                    margin-left: 10px;
                }

                .course_container .main .main-content-two .module .options .option .brief {
                    margin-left: 10px;
                }

                    .course_container .main .main-content-two .module .options .option .brief > p {
                        font-size: 15px;
                        font-weight: 400;
                        color: #333;
                        overflow: hidden;
                        text-overflow: ellipsis;
                        white-space: nowrap;
                    }

                    .course_container .main .main-content-two .module .options .option .brief > span {
                        width: 90px;
                        display: block;
                        font-size: 12px;
                        font-weight: 400;
                        color: #999;
                        overflow: hidden;
                        text-overflow: ellipsis;
                        white-space: nowrap;
                    }

                .course_container .main .main-content-two .module .options .option:hover .toTopic {
                    display: flex;
                }

                .course_container .main .main-content-two .module .options .option .toTopic {
                    display: none;
                    align-items: center;
                    justify-content: center;
                    position: absolute;
                    width: 100%;
                    height: 100%;
                    background-color: rgba(255, 255, 255, 0.8);
                }


                    .course_container .main .main-content-two .module .options .option .toTopic .toTopic-btn {
                        display: flex;
                        align-items: center;
                        justify-content: center;
                        width: 50%;
                        height: 25px;
                        background-color: #0384fc;
                        border-radius: 15px;
                        color: #fff;
                    }

        .course_container .main .main-content-two .module .download-nav {
            position: relative;
            padding-top: 20px;
            width: 100%;
            border-bottom: 1px solid #f2f2f2;
        }

            .course_container .main .main-content-two .module .download-nav .list {
                cursor: pointer;
                width: 100px;
            }

                .course_container .main .main-content-two .module .download-nav .list:after {
                    margin-top: 10px;
                    content: '';
                    border-radius: 4px;
                    width: 30px;
                    height: 3px;
                }

            .course_container .main .main-content-two .module .download-nav .active:after {
                background: #0384fc;
            }

            .course_container .main .main-content-two .module .download-nav .more {
                position: absolute;
                right: 10px;
                cursor: pointer;
                font-size: 14px;
                font-weight: 400;
                color: #999;
                line-height: 34px;
            }

        .course_container .main .main-content-two .module .dataDownload {
            overflow: hidden;
        }

        .course_container .main .main-content-two .module .download-chunk {
            padding: 16px 10px;
            border-bottom: 1px dashed #f2f2f2;
        }

            .course_container .main .main-content-two .module .download-chunk .title {
                width: 270px;
                height: 37px;
                font-size: 14px;
                font-weight: 400;
                color: #555;
            }

            .course_container .main .main-content-two .module .download-chunk .download-operation {
                margin-top: 12px;
                position: relative;
                font-size: 12px;
                font-weight: 400;
                color: #999;
            }

                .course_container .main .main-content-two .module .download-chunk .download-operation > p {
                    margin-right: 20px;
                }

                .course_container .main .main-content-two .module .download-chunk .download-operation button {
                    cursor: pointer;
                    position: absolute;
                    right: 10px;
                    width: 70px;
                    height: 24px;
                    background: #fff;
                    border: 1px solid #b4dbff;
                    border-radius: 12px;
                    font-size: 13px;
                    font-weight: 400;
                    color: #0384fc;
                }

        .course_container .main .main-content-two .module .hotTopic {
            padding: 5px;
            overflow: hidden;
        }

            .course_container .main .main-content-two .module .hotTopic .list {
                box-sizing: border-box;
                position: relative;
                font-size: 14px;
                margin: 15px 10px;
            }

                .course_container .main .main-content-two .module .hotTopic .list > span {
                    width: 265px;
                    overflow: hidden;
                    text-overflow: ellipsis;
                    white-space: nowrap;
                }

                .course_container .main .main-content-two .module .hotTopic .list > i {
                    margin-right: 8px;
                    display: block;
                    width: 5px;
                    height: 5px;
                    background-color: #acc3d9;
                    border-radius: 50%;
                }

.course_container .main .main-more {
    cursor: pointer;
    margin-top: 20px;
    font-size: 14px;
    font-weight: 400;
    color: #666;
}

    .course_container .main .main-more > span {
        padding: 0 5px;
    }

.course_container .main .main-content-two .module .hotTopic .list > span:hover {
    color: #0384fc;
}

.course_container .main .main-content-two .course:hover {
    box-shadow: 0 0 20px 10px #eaeaea;
}

.course_container .main .main-content-two .course .price > button:hover {
    background: #0384fc;
    color: #fff;
    border: none;
}

.sborder {
    border: solid 1px rgb(242, 242, 242);
}

.empty{
    margin-top:80px;
}