/*题库*/
.tk_itmes {
    width: 1200px;
    margin: 50px auto;
}

    .tk_itmes ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
    }

        .tk_itmes ul li {
            width: 283px;
            height: 283px;
            text-align: center;
        }

            .tk_itmes ul li span {
                padding-top: 170px;
                font-size: 24px;
                display: block;
                color: #666;
            }

            .tk_itmes ul li.bg_01 {
                background: url(../img/tk01.png) no-repeat top center;
            }

                .tk_itmes ul li.bg_01:hover {
                    background: url(../img/tk05.png) no-repeat top center;
                    transition: .5s;
                }

            .tk_itmes ul li.bg_02 {
                background: url(../img/tk02.png) no-repeat top center;
            }

                .tk_itmes ul li.bg_02:hover {
                    background: url(../img/tk06.png) no-repeat top center;
                    transition: .5s;
                }

            .tk_itmes ul li.bg_03 {
                background: url(../img/tk03.png) no-repeat top center;
            }

                .tk_itmes ul li.bg_03:hover {
                    background: url(../img/tk07.png) no-repeat top center;
                    transition: .5s;
                }

            .tk_itmes ul li.bg_04 {
                background: url(../img/tk04.png) no-repeat top center;
            }

                .tk_itmes ul li.bg_04:hover {
                    background: url(../img/tk08.png) no-repeat top center;
                    transition: .5s;
                }

.tk_subjects {
    width: 1200px;
    height: 50px;
    background-color: #fff;
    display: block;
    margin: 50px auto;
}

    .tk_subjects ul {
        display: flex;
        width: 566px;
        height: 50px;
        line-height: 50px;
        margin: 0 auto;
        text-align: center;
    }

        .tk_subjects ul li {
            width: 283px;
            color: #666;
            cursor: pointer;
        }

            .tk_subjects ul li:hover {
                border-bottom: 2px solid #43a5ff;
            }

.tk_list {
    width: 1200px;
    height: 400px;
    height: 800px;
    display: flex;
    background-color: #eee;
    margin: 50px auto;
}

    .tk_list .tk_list_left {
        display: block;
        width: 280px;
        text-align: center;
        background-color: #eee;
        color: #999;
    }

        .tk_list .tk_list_left ul li:hover {
            background: rgb(183, 208, 255);
            color: #fff;
            transition: transform 0.3s;
        }

        .tk_list .tk_list_left ul {
            display: block;
            width: 280px;
            margin: 0 auto;
        }

            .tk_list .tk_list_left ul li {
                line-height: 30px;
                border-bottom: 1px #ddd solid;
                cursor: pointer;
                padding: 20px 0;
                font-size: 20px;
            }

                .tk_list .tk_list_left ul li p {
                    font-size: 14px;
                    padding: 10px 20px 0 20px;
                }

.tk_list_right {
    background-color: #fff;
    display: block;
    width: 960px;
    padding: 20px;
    overflow: hidden;
    overflow-y: scroll;
    overflow: hidden;
    overflow-y: scroll;
}

    .tk_list_right ol {
        padding: 0 20px;
    }

        .tk_list_right ol li {
            border-bottom: 1px #ddd solid;
            list-style-type: decimal;
            padding: 5px 0 20px 0;
            line-height: 50px;
            position: relative;
        }

            .tk_list_right ol li:hover {
                background: #f6f6f6;
            }

            .tk_list_right ol li img {
                width: 17px;
                height: 17px;
                margin: -4px auto;
                padding-right: 5px;
            }

            .tk_list_right ol li span {
                width: 800px;
                color: #666;
                width: 80%;
            }

            .tk_list_right ol li .list_lx {
                position: absolute;
                top: 20%;
                right: 10px;
            }

                .tk_list_right ol li .list_lx a {
                    color: #43a5ff;
                }

                    .tk_list_right ol li .list_lx a:hover {
                        color: #00deec;
                    }

.nav_qh {
    width: 840px;
    background-color: #fff;
    font-size: 20px;
    margin: 20px auto;
    position: relative;
    z-index: 999999;
}

    .nav_qh .nav_qh_top {
        background-color: #eee;
    }

        .nav_qh .nav_qh_top .qh_lm {
            display: flex;
            height: 80px;
            line-height: 80px;
        }

            .nav_qh .nav_qh_top .qh_lm li {
                display: block;
                width: 200px;
                color: #000;
                text-align: center;
                border-right: 1px #ddd solid;
            }

                .nav_qh .nav_qh_top .qh_lm li:hover {
                    background-color: #43a5ff;
                    color: #fff;
                }

                .nav_qh .nav_qh_top .qh_lm li:last-child {
                    border: none;
                }

    .nav_qh .nav_qh_bottom .qh_dj {
        display: flex;
        height: 100px;
        line-height: 100px;
        padding: 0 40px;
    }

        .nav_qh .nav_qh_bottom .qh_dj li {
            display: block;
            width: 400px;
            color: #000;
            text-align: center;
            border-bottom: 1px #ddd solid;
        }

            .nav_qh .nav_qh_bottom .qh_dj li:hover {
                color: #43a5ff;
                border-bottom: 2px solid #43a5ff;
            }

            .nav_qh .nav_qh_bottom .qh_dj li a {
                text-decoration: none;
            }

.qh_dj a:hover {
    color: #43a5ff;
}

.nav_qh .nav_qh_bottom .qh_dj li a:hover {
    color: #43a5ff;
}

.nav_qh .nav_qh_bottom .qh_zy {
    padding: 20px 0;
}

    .nav_qh .nav_qh_bottom .qh_zy li {
        display: inline-block;
        width: 195px;
        height: 30px;
        color: #000;
        padding: 10px 0;
        text-align: center;
    }

        .nav_qh .nav_qh_bottom .qh_zy li a {
            color: #000;
            text-decoration: none;
        }

            .nav_qh .nav_qh_bottom .qh_zy li a:hover {
                color: #43a5ff;
            }

.hide01 {
    display: none;
}

.show {
    display: block;
}

.selected_project {
    color: #43a5ff;
    border-bottom: 2px solid #43a5ff;
}

.selected_project_class {
    background-color: #43a5ff;
    color: #fff;
}




.dropdown-content {
    width: 100px;
    height: 30px;
    background-color: #f2f9ff;
    position: absolute;
    top: 90px;
    left: 50px;
    display: none;
    cursor: pointer;
    text-align: center;
}

    .dropdown-content a {
        display: block;
        width: 100px;
        height: 30px;
        cursor: pointer;
        background-color: #f2f9ff;
    }


.dropdown:hover .dropdown-content {
    display: block;
    background-color: #f2f9ff;
}

.xxk_item {
    padding: 30px 0;
    text-align: center;
    font-size: 20px;
    color: #000000;
}

.xxk_anniu {
    width: 200px;
    margin: 0 auto;
}

    .xxk_anniu a {
        text-decoration: none;
    }

.xxk_a1 {
    display: block;
    width: 80px;
    height: 35px;
    background: #02d9d5;
    text-align: center;
    line-height: 35px;
    color: #fff;
    float: left;
    border-radius: 5px;
}

.xxk_a2 {
    display: block;
    width: 80px;
    height: 35px;
    background: #dcdcdc;
    text-align: center;
    line-height: 35px;
    color: #333;
    float: right;
    border-radius: 5px;
}

    .xxk_a1:hover, .xxk_a2:hover {
        opacity: 0.8;
    }

.black_overlay {
    display: none;
    position: absolute;
    top: 0%;
    left: 0%;
    width: 100%;
    height: 100%;
    background-color: black;
    z-index: 1001;
    -moz-opacity: 0.8;
    opacity: .80;
    filter: alpha(opacity=80);
}