.course-view[hidden]{display:none}.course-card{display:grid;gap:8px;min-height:126px;padding:17px;border:1px solid #dfe3d8;border-radius:10px;background:linear-gradient(145deg,#fffffb,#f2f4eb);text-align:left;cursor:pointer;transition:transform .16s,border-color .16s,box-shadow .16s}.course-card:hover{transform:translateY(-2px);border-color:#aebca8;box-shadow:0 9px 20px rgba(40,57,44,.09)}.course-card>span,.course-shell header small{color:#8b9586;font-size:9px;letter-spacing:.08em}.course-card>b{color:#344a39;font:500 16px/1.45 Georgia,"Songti SC",serif}.course-card>small{align-self:end;color:#738375;font-size:9px}.course-card[hidden]{display:none}.course-shell{min-height:500px;padding:clamp(16px,3vw,26px);border:1px solid #d9dfd4;border-radius:14px;background:radial-gradient(ellipse at 10% 4%,rgba(218,226,207,.58),transparent 36%),#f8f9f4;box-shadow:0 12px 34px rgba(32,50,39,.06)}.course-shell>header{display:flex;align-items:flex-start;justify-content:space-between;gap:15px;border-bottom:1px solid #dfe3d8;padding-bottom:14px}.course-shell h2{margin:6px 0;color:#293d2f;font:500 clamp(22px,3vw,30px) Georgia,"Songti SC",serif}.course-shell header p{margin:0;color:#7a867a;font-size:10px;line-height:1.6}.course-shell header button,.course-player-controls button{flex:none;border:1px solid #d7ded4;border-radius:7px;background:#fffefa;color:#546858;padding:8px 11px;font:inherit;font-size:9px;cursor:pointer}.course-filter{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 0;color:#92998d;font-size:8px}.course-filter input{width:min(380px,100%);border:1px solid #dfe4da;border-radius:6px;background:#fffefa;padding:9px 10px;color:#405346;font:inherit;font-size:10px}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.course-player-frame{position:relative;aspect-ratio:16/9;margin-top:14px;border-radius:9px;background:#101915;overflow:hidden}.course-player-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.course-player-controls{display:flex;justify-content:center;gap:8px;padding:12px}.course-player-controls button:disabled{opacity:.45;cursor:default}.course-player-controls .course-play{border-color:#36563e;background:#36563e;color:#fff}.course-loading{display:grid;place-items:center;min-height:300px;color:#728273;text-align:center;font:16px Georgia,"Songti SC",serif;line-height:2}.course-loading button{border:1px solid #d5ded2;border-radius:6px;background:white;color:#4f6954;padding:8px 12px;cursor:pointer}@media(max-width:850px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:550px){.course-shell{padding:13px 10px}.course-grid{grid-template-columns:1fr}.course-card{min-height:92px}.course-shell>header{gap:7px}.course-shell header p{max-width:230px}.course-shell header button{padding:7px 8px}.course-filter{align-items:stretch;flex-direction:column}}
.course-player-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(230px,300px);align-items:start;gap:13px;margin-top:14px}.course-player-main{min-width:0}.course-player-layout .course-player-frame{margin-top:0}.course-player-note{margin:0 5px 5px;color:#8a9589;font-size:9px;line-height:1.6}.course-episode-panel{min-width:0;overflow:hidden;border:1px solid #dfe4d9;border-radius:8px;background:#fffefa}.course-episode-filter{display:grid;gap:7px;padding:10px;border-bottom:1px solid #e4e8df}.course-episode-filter label{color:#4e6651;font-size:10px;font-weight:700}.course-episode-filter input{width:100%;box-sizing:border-box;border:1px solid #dfe4d9;border-radius:5px;padding:7px 8px;color:#405346;font:inherit;font-size:9px}.course-episode-groups{max-height:min(66vh,610px);overflow:auto;overscroll-behavior:contain}.course-episode-group h3{position:sticky;top:0;z-index:1;margin:0;padding:7px 10px;background:#eef2e9;color:#69796a;font-size:9px;font-weight:700}.course-episode-group h3 span{float:right;color:#909a8f;font-weight:500}.course-episode-group>div{display:grid;padding:3px}.course-episode{display:flex;align-items:center;justify-content:space-between;gap:5px;width:100%;border:0;border-radius:4px;background:transparent;color:#667369;padding:7px 8px;text-align:left;font:inherit;font-size:9px;line-height:1.4;cursor:pointer}.course-episode:hover{background:#f0f4ed;color:#324d38}.course-episode[aria-pressed="true"]{background:#36563e;color:#fff}.course-episode[hidden],.course-episode-group[hidden]{display:none}.course-episode small{flex:none;border-radius:9px;background:#fff2d7;color:#9b6d1e;padding:2px 5px;font-size:7px}.course-episode.is-word small{background:#e8f4f7;color:#4b8291}.course-episode[aria-pressed="true"] small{background:#ffffff2b;color:#fff}.course-episode:focus-visible,.course-episode-filter input:focus-visible{outline:2px solid #66896b;outline-offset:1px}
@media(max-width:700px){.course-player-layout{grid-template-columns:minmax(0,1fr)}.course-episode-groups{max-height:250px}.course-player-layout .course-player-controls{flex-wrap:wrap}.course-player-layout .course-player-controls button{min-width:90px}}
.course-episode small.course-episode-time{margin-right:auto;background:transparent;color:#98a08f;padding:0;font-size:7px}.course-episode[aria-pressed="true"] small.course-episode-time{color:#d9e4d8}