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strong{font-size:18px}.el-main{padding:20px 14px 90px}h1{font-size:24px}.grid,.chapter-grid{grid-template-columns:minmax(0,1fr)}.mobile-nav{bottom:0;background:var(--el-bg-color);border-top:1px solid var(--el-border-color);z-index:10;justify-content:space-around;padding:18px 8px;display:flex;position:fixed;inset-inline:0}.mobile-nav a{color:var(--el-text-color-regular)}.mobile-nav .router-link-exact-active{color:var(--el-color-primary)}.question-nav{grid-template-columns:repeat(8,1fr)}.el-drawer{width:100%!important}}@media only screen and (width<=767px){.hidden-xs-only{display:none!important}}@media only screen and (width>=768px){.hidden-sm-and-up{display:none!important}}@media only screen and (width>=768px) and (width<=991px){.hidden-sm-only{display:none!important}}@media only screen and (width<=991px){.hidden-sm-and-down{display:none!important}}@media only screen and (width>=992px){.hidden-md-and-up{display:none!important}}@media only screen and (width>=992px) and 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