:root{--course-nav-width:252px}.course-menu-button{position:fixed;left:16px;bottom:18px;z-index:92;border:0;border-radius:999px;background:#584776;color:#fff;padding:11px 15px;font-weight:850;box-shadow:0 10px 30px #34274342;cursor:pointer}.course-sidebar{position:fixed;inset:0 auto 0 0;width:var(--course-nav-width);z-index:91;background:#fffdfd;border-right:1px solid #e7ddea;box-shadow:10px 0 34px #46365512;display:flex;flex-direction:column;color:#35303d}.course-sidebar-head{padding:22px 18px 16px;background:linear-gradient(145deg,#eee5fb,#fff0e9)}.course-sidebar-kicker{display:block;font-size:10px;letter-spacing:.13em;font-weight:900;color:#655079;text-transform:uppercase}.course-sidebar-head h2{font-size:20px;line-height:1.2;margin:7px 0 4px}.course-sidebar-count{font-size:11px;color:#756c7c}.course-sidebar-close{position:absolute;right:10px;top:10px;border:0;border-radius:50%;width:30px;height:30px;background:#ffffffbf;color:#584776;font-size:18px;cursor:pointer}.course-lesson-list{list-style:none;margin:0;padding:12px;overflow:auto}.course-lesson-list li{margin:4px 0}.course-lesson-link{display:grid;grid-template-columns:34px 1fr;gap:9px;align-items:start;text-decoration:none;color:#3a3440;padding:10px;border-radius:13px;border:1px solid transparent}.course-lesson-link:hover{background:#f6f1fa}.course-lesson-link.active{background:#eee5f7;border-color:#d5c5e5;color:#4b3768}.course-lesson-number{display:grid;place-items:center;width:32px;height:32px;border-radius:10px;background:#f1edf4;color:#665776;font-size:11px;font-weight:900}.course-lesson-link.active .course-lesson-number{background:#584776;color:#fff}.course-lesson-title{font-size:13px;font-weight:850;line-height:1.3}.course-lesson-zh{display:block;margin-top:3px;font-size:11px;font-weight:600;color:#817786}.course-sidebar-foot{margin-top:auto;padding:13px 17px;border-top:1px solid #eee6ef;color:#7a7080;font-size:10px}.course-sidebar-backdrop{position:fixed;inset:0;z-index:90;background:#2b223747;backdrop-filter:blur(2px)}
@media(min-width:1180px){body.course-nav-ready{padding-left:var(--course-nav-width)}.course-menu-button,.course-sidebar-close,.course-sidebar-backdrop{display:none!important}.course-sidebar{transform:none!important}}
@media(max-width:1179px){.course-sidebar{transform:translateX(-105%);transition:transform .22s ease}.course-sidebar.open{transform:translateX(0)}.course-sidebar-backdrop[hidden]{display:none}}
@media(max-width:520px){.course-menu-button{left:10px;bottom:10px;padding:9px 12px;font-size:12px}.course-sidebar{width:min(88vw,320px)}}