/* V1.3.11: video/details/catalog at left; discussion at right. */
.lesson-study-page .lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:24px;align-items:start}.lesson-study-column,.lesson-main,.lesson-practice-area{min-width:0}.lesson-study-page .lesson-catalog{position:static;max-height:none;overflow:visible;margin:20px 0}.lesson-study-page .lesson-main{width:auto}.lesson-study-page .video-wrap{border-radius:10px;background:#111;overflow:hidden}.lesson-study-page .video-wrap video{display:block;width:100%;aspect-ratio:16/9;max-height:none;background:#111}.lesson-study-page .video-title{padding:20px 0 8px}.lesson-study-page .video-title h1{font-size:24px;line-height:1.5;margin:0 0 8px;color:#17202b}.lesson-study-page .video-meta{gap:12px;display:flex;flex-wrap:wrap;font-size:13px;color:#788396}.lesson-social-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:26px;padding:16px 0 6px}.lesson-social-toolbar button{display:flex;align-items:center;gap:8px;padding:6px 0;margin:0;background:transparent;border:0;color:#637187;font-size:14px;cursor:pointer}.lesson-social-toolbar b,.lesson-views b{font-weight:400}.lesson-social-toolbar button[disabled]{opacity:.55;cursor:default}.lesson-social-toolbar .selected,.discussion-sort .selected,.discussion-meta .selected{color:#2478f2}.lesson-views{display:flex;align-items:center;gap:7px;font-size:13px;color:#8490a1}.social-status{font-size:13px;color:#6b778a;margin:5px 0}.social-status:empty,.social-error:empty{display:none}.lesson-intro{margin:18px 0;padding:18px 22px;border:1px solid #e5ebf2;border-radius:8px;background:#fff}.lesson-intro summary{font-size:16px;font-weight:600;cursor:pointer;color:#17202b;display:flex;justify-content:space-between;align-items:center;list-style:none}.lesson-intro summary::after{content:'展开';font-size:13px;font-weight:400;color:#2478f2}.lesson-intro[open] summary::after{content:'收起'}.lesson-intro p{white-space:pre-wrap;overflow-wrap:anywhere;color:#536277;font-size:14px;line-height:1.9;margin:16px 0 0}.lesson-intro .teacher-name{font-size:13px}.lesson-study-page .lesson-discussion{position:sticky;top:20px;min-width:0;padding:22px;margin:0;border-radius:10px;border:1px solid #e5ebf2}.discussion-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:20px}.discussion-header h2{font-size:17px;margin:0;color:#17202b}.discussion-header h2 span{font-size:14px;font-weight:400;color:#788396}.discussion-sort{display:flex;gap:12px}.discussion-sort button{font-size:12px;background:none;border:0;cursor:pointer;white-space:nowrap;padding:5px 0;color:#788396}.discussion-sort .selected{font-weight:600}.lesson-discussion textarea{box-sizing:border-box;display:block;width:100%;height:100px;resize:vertical;min-height:80px;max-height:240px;font-family:inherit;font-size:14px;line-height:1.7;padding:12px;border:1px solid #dce4ef;border-radius:6px;background:#f9fbfd;color:#17202b}.discussion-compose-bottom{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:10px}.discussion-compose-bottom span{font-size:12px;color:#8490a0}.discussion-comment{display:flex;gap:12px;padding:20px 0;border-bottom:1px solid #ecf0f6}.discussion-avatar{width:34px;height:34px;flex-shrink:0;border-radius:50%;overflow:hidden;display:flex;align-items:center;justify-content:center;background:#edf2f8;font-size:11px;color:#7e8fa6}.discussion-avatar img{width:100%;height:100%;object-fit:cover}.discussion-body{flex:1;min-width:0}.discussion-author{font-size:13px;font-weight:600;line-height:1.7;color:#33435b;overflow-wrap:anywhere}.discussion-mine{margin-left:8px;color:#2478f2;background:#eef5ff;padding:2px 4px;font-size:10px;font-weight:400}.discussion-content{font-size:14px;color:#28374b;line-height:1.8;margin:8px 0 10px;white-space:pre-wrap;overflow-wrap:anywhere}.discussion-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.discussion-meta time{font-size:11px;color:#8490a0;flex:1;white-space:nowrap}.discussion-meta button{display:flex;align-items:center;gap:4px;background:none;border:0;color:#78879a;cursor:pointer;font-size:12px;padding:0}.discussion-meta svg{width:15px;height:15px}.discussion-more{display:block;width:100%;border:0;background:none;color:#2478f2;font-size:13px;padding:18px 0 0;cursor:pointer}.discussion-more[hidden]{display:none}.social-empty{font-size:13px;line-height:1.9;color:#788396;margin:20px 0;text-align:left}.social-error{font-size:13px;line-height:1.7;color:#a43333;background:#fff3f3;padding:10px;border-radius:4px}.lesson-favorites .favorite-card{display:flex;align-items:center;gap:18px}.favorite-card .favorite-info{min-width:0;flex:1}.favorite-card h3{margin:0 0 8px;font-size:17px}.favorite-card .btn{flex-shrink:0}.lesson-study-page .lesson-catalog h2{font-size:18px;margin:0 0 18px}.lesson-study-page .lesson-row{padding:14px 10px}.lesson-study-page .lesson-row .lesson-name{min-width:0;overflow-wrap:anywhere}
@media(max-width:1050px){.lesson-study-page .lesson-layout{grid-template-columns:minmax(0,1fr) 320px;gap:18px}.lesson-study-page .lesson-discussion{padding:18px}}@media(max-width:780px){.lesson-study-page .lesson-layout{display:block}.lesson-study-page .lesson-discussion{position:static;margin-top:24px}.lesson-study-page .video-title h1{font-size:20px}.lesson-social-toolbar{gap:20px}.lesson-favorites .favorite-card{flex-wrap:wrap}.favorite-card .btn{width:100%;text-align:center}}

@media(min-width:781px){.lesson-study-page .lesson-discussion [data-comment-list]{max-height:62vh;overflow-y:auto;overscroll-behavior:contain;padding-right:3px}}

.lesson-study-page .lesson-main{background:#fff;border:1px solid #e5ebf2;border-radius:10px;overflow:hidden}.lesson-study-page .video-title{padding:20px;margin:0;border:0}.lesson-study-page .video-meta{margin-bottom:0;overflow-wrap:anywhere;align-items:flex-start}.lesson-study-page .video-meta span{min-width:0;max-width:100%}.lesson-study-page .lesson-social-toolbar{padding:0 20px 6px}.lesson-study-page .social-status{margin:10px 20px}.lesson-study-page .lesson-intro{margin:16px 20px 20px;padding:16px 0 0;border:0;border-top:1px solid #e5ebf2;border-radius:0}.lesson-study-page .video-wrap{border-radius:0}