bg-light index-style pt-lg-0 pb-5 pb-lg-0, d-none m-header, container d-flex justify-content-between align-items-center bg-white border-bottom flex-nowrap, m-header-left flex-shrink-0 d-flex align-items-center, , m-header-title flex-1 text-ellipsis text-center, input-group m-header-search, input-group-prepend, input-group-text, iconfont font-12, form-control font-12, m-header-right flex-shrink-0 d-flex align-items-center, login-phone-modal, d-lg-none text-right py-3 px-3 bg-white, login-phone-modal login-hide, login-show user-name, top-nav border-bottom d-none d-lg-block, navbar navbar-expand-lg navbar-light container, navbar-text mb-0, d-inline text-black-50, navbar-toggler, navbar-toggler-icon, collapse navbar-collapse, navbar-nav, nav-item dropdown, nav-link border-left, nav-link dropdown-toggle border-left border-right, dropdown-menu nav-list, row flex-wrap px-3, text-secondary col-4 mb-2, nav-item login-hide, nav-link text-primary login-modal, nav-item login-hide reg-modal border-right, nav-link, nav-item dropdown login-show border-right, nav-link dropdown-toggle d-flex align-items-center, dropdown-img, user-avatar, user-name, dropdown-menu history-list dropdown-menu-right, d-flex border-bottom px-3 pb-2 justify-content-between, text-black-50 mb-0, text-primary d-block, history-lists empty-box-2, d-flex pt-2 border-top px-3 justify-content-between, text-secondary d-block, text-warning d-none, header-top d-none d-lg-block border-bottom, d-flex container py-4 justify-content-between align-items-center, d-block mr-5 logo, input-group mr-4, form-control, input-group-append, btn btn-primary px-4 searchBtn, iconfont, d-flex align-items-center header-top-right, d-block text-center goUpload, d-inline-block, mb-0 font-12 mt-1 text-secondary, d-block text-center ml-3, container, row align-items-center mx-0, nav-sidebar-tab col, nav nav-pills, nav-item d-flex align-items-center justify-content-between w-100, nav-link pl-0 flex-grow-1, iconfont text-white font-12, nav col-10 main-nav pl-3, nav-item, nav-link px-4, container mt-lg-3, row no-gutters mx-0 gg-area, col nav-sidebar index-nav-sidebar, m-nav-sidebar-tab d-lg-none, nav nav-pills align-items-center, m-close-nav-sidebar, tab-content, tab-pane fade show active, text-dark d-flex justify-content-between align-items-center text-decoration-none, d-none d-lg-block second-nav, text-nowrap overflow-hidden, d-inline-block text-black-50 px-1 pt-0 pb-2, nav-popover, font-14, d-flex, d-flex flex-wrap, text-dark, col-12 col-lg-10, row no-gutters, carousel slide col-12 col-lg-8 px-lg-3 d-none d-lg-block, carousel-indicators, active, carousel-inner, carousel-item subsitute-bg active, d-block w-100, carousel-caption d-none d-md-block, carousel-item subsitute-bg , carousel-control-prev, carousel-control-prev-icon, sr-only, carousel-control-next, carousel-control-next-icon, pb-3 d-lg-none px-3 bg-white w-100, mt-3 mb-4 text-center, input-group, pl-2 pr-3 pb-4 bg-white d-lg-none w-100, d-flex flex-wrap align-items-center hot-nav-list, col-4 px-0 d-none d-lg-block, gg-data row mx-0 align-items-center, col-6 text-center border-right, text-ellipsis mb-3, text-danger mb-0 font-weight-bold, col-6 text-center, text-warning mb-0 font-weight-bold font-16, text-secondary text-ellipsis font-12, text-warning mb-0 font-weight-bold font-16 mt-3, text-secondary text-ellipsis mb-0 font-12, gg-nav row mx0 mt-3, col-4 text-secondary text-decoration-none text-ellipsis hover-letter-spacing, mb-2, mt-3 align-items-center justify-content-between bg-white px-3 py-3 d-none d-lg-flex container, iconfont d-block, member-announce d-flex align-items-center, d-block font-14 flex-shrink-0 ml-4 text-black-50, container mt-3, topic-and-paper, d-flex align-items-center mx-3 mx-lg-4 py-3 justify-content-between, d-flex align-items-center, left-border-3 mb-0, d-none d-lg-block mb-0 font-14 text-muted, text-muted pl-3 hover-letter-spacing d-none d-lg-block font-14 , mx-4 px-0 row justify-content-between topic-and-paper-con-item tab-inner-content, font-14 col-12 col-lg-6 px-0 px-lg-3, text-dark office-icon office-icon-doc border-bottom text-decoration-none py-3 d-lg-flex align-items-center justify-content-between text-ellipsis, text-ellipsis flex-grow-1, font-12 text-black-50 pl-3 flex-shrink-0 d-none d-lg-block, lesson-preparation mt-3, d-flex align-items-center justify-content-between mx-3 mx-lg-4 py-3, left-border-3 mb-0 w-auto mr-lg-4 text-nowrap, d-none d-lg-flex my-0 px-0 align-items-center flex-wrap, mr-3, btn btn-light rounded-pill py-1 text-nowrap, text-muted pl-3 hover-letter-spacing d-none d-lg-block font-14 text-nowrap flex-shrink-0, mx-75 px-0 pt-4 mb-0 d-flex lesson-preparation-con-item flex-grow-1 flex-wrap tab-inner-topic, font-14 with-topic, rounded border subsitute-bg overflow-hidden position-center-img , text-ellipsis-2 mt-1 mb-0, gg-gap d-none d-lg-block, rounded, mt-3 d-none d-lg-block bg-white excellent-author bg-img-none with-index, d-flex align-items-center mx-3 mx-lg-4 py-3 , text-dark font-weight-bold, text-success pl-4 hover-letter-spacing, px-4 pb-4, d-flex px-0 flex-wrap mb-0, card, card-body, card-title d-flex align-items-start, excellent-author-avatar flex-shrink-0, w-0 flex-grow-1, mb-0 font-18 flex-grow-1 text-ellipsis, font-14 text-black-50 my-1, text-secondary, font-14 mb-0 text-black-50 text-ellipsis-2, border with-success d-flex align-items-center justify-content-between py-3 px-3, font-18 mb-2, font-14 text-black-50 mb-0, iconfont text-black-50, latest-information mt-3, d-flex article-square px-lg-4 pt-4 align-items-start, d-none d-lg-block article-square-left, nav custom-tab d-block, nav-item mb-2, tab-content article-square-right, px-0 mb-0 d-flex latest-information-con-item flex-grow-1 flex-wrap align-items-start tab-inner-content, rounded border overflow-hidden subsitute-bg office-icon-img office-icon-doc position-center-img , tab-pane fade , rounded border overflow-hidden subsitute-bg office-icon-img office-icon-docx position-center-img , rounded border overflow-hidden subsitute-bg office-icon-img office-icon-ppt position-center-img , rounded border overflow-hidden subsitute-bg office-icon-img office-icon-pptx position-center-img , rounded border overflow-hidden subsitute-bg office-icon-img office-icon-pdf position-center-img , font-14 with-ppt, friend-link mt-3, d-flex align-items-center border-bottom mx-3 mx-lg-4 py-3, px-2 pt-2 d-none d-lg-flex mx-0 px-4 mt-3 flex-wrap, px-2 pt-2 d-flex d-lg-none mx-0 px-4 mt-3 flex-wrap, container d-none d-lg-block mb-4, d-flex justify-content-between footer-nav, d-flex foot-nav, text-decoration-none help-nav-item, foot-qrcode d-flex, subsitute-bg, footer-copyright, m-bottom-nav border-top, d-flex d-lg-none align-items-center m-main-nav bg-filter, toast-area,