:root{font-family:"Microsoft YaHei","PingFang SC",sans-serif;color:#21334a;background:#f7f9fc;font-synthesis:none;--blue:#1681ff;--muted:#8592a5;--line:#e8edf4}
.brand-logo{display:block;width:51px;height:51px;object-fit:contain;flex:none}.auth-logo{display:block;width:60px;height:60px;object-fit:contain;margin-bottom:16px}@media(max-width:900px){.brand-logo{width:44px;height:44px}}
*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button{cursor:pointer}a,button,input,select{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #93c7ff;outline-offset:4px}
.site-header{background:#fff;border-bottom:1px solid var(--line)}.header-inner,.page{max-width:1420px;margin:auto;padding:0 36px}.header-inner{display:flex;align-items:center;gap:42px;min-height:96px}.brand{display:flex;align-items:center;gap:14px;font-weight:700;font-size:22px;white-space:nowrap}.brand-mark{display:grid;place-items:center;width:47px;height:47px;border-radius:14px;background:#eaf4ff;color:var(--blue);font-size:29px}.main-nav{display:flex;align-items:center;align-self:stretch;gap:34px;font-size:15px;color:#6c798b}.main-nav a{position:relative;display:flex;align-items:center}.main-nav a.active{color:var(--blue);font-weight:600}.main-nav a.active:after{content:"";position:absolute;bottom:0;height:3px;background:var(--blue);left:0;right:0;border-radius:3px 3px 0 0}.header-search{margin-left:auto;display:flex;align-items:center;background:#f5f7fa;border:1px solid #f0f3f7;border-radius:7px;padding:0 8px 0 14px;width:270px}.header-search input{width:100%;min-width:0;background:none;border:0;outline:0;padding:11px 0;font-size:13px}.header-search button{border:0;background:transparent;color:#7890aa;padding:5px;display:flex;align-items:center}.header-search svg{width:20px;height:20px}
.section-top{display:flex;align-items:center;gap:20px;margin:36px 0 22px}.section-top h1{font-size:25px;margin:0;font-weight:600}.sort{margin-left:auto;border:1px solid var(--line);border-radius:6px;background:#fff;color:#758498;padding:9px 11px;font-size:13px}.category-bar{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 28px}.category{font-size:14px;min-width:92px;padding:9px 16px;border:1px solid #e0e7f0;border-radius:22px;background:#fff;color:#7a899e}.category.active{background:var(--blue);border-color:var(--blue);color:#fff}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:31px 26px}.course-card{display:block;min-width:0}.course-picture{position:relative;aspect-ratio:16/9;border-radius:8px;background:#e4ebf2;overflow:hidden}.course-picture img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .2s}.course-card:hover img{transform:scale(1.025)}.replay-badge{position:absolute;top:0;left:0;background:var(--blue);padding:6px 16px;color:#fff;font-size:12px;border-radius:8px 0 7px 0}.duration{position:absolute;right:10px;bottom:10px;color:#fff;font-size:12px;font-variant-numeric:tabular-nums;background:#183048c9;border-radius:4px;padding:4px 7px}.hover-play{position:absolute;inset:0;display:grid;place-items:center;background:#05234822;opacity:0;transition:opacity .2s}.hover-play span{display:grid;place-items:center;width:52px;height:52px;border-radius:50%;background:#ffffffed;color:var(--blue);font-size:20px;padding-left:4px}.course-card:hover .hover-play{opacity:1}.course-card h2{font-size:17px;font-weight:600;line-height:1.65;margin:13px 0 8px;min-height:56px;overflow-wrap:anywhere}.course-date{font-size:12px;line-height:1.8;color:var(--muted);font-variant-numeric:tabular-nums}.course-date .date-pending{color:#a57b3a}.site-footer{border-top:1px solid var(--line);margin-top:44px;background:#fff;color:#98a3b3;text-align:center;font-size:12px;padding:24px 16px}.empty{grid-column:1/-1;text-align:center;color:var(--muted);padding:90px 20px;background:#fff;border:1px solid var(--line);border-radius:8px}.empty p{margin:0 0 18px}.plain-button{border:1px solid var(--line);background:#fff;border-radius:6px;color:var(--blue);padding:9px 17px}
.watch-page{max-width:1320px}.breadcrumbs{display:flex;align-items:center;gap:10px;font-size:13px;color:#8795a8;margin:24px 0}.breadcrumbs a:hover{color:var(--blue)}.watch-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:24px;align-items:start}.watch-main{background:#fff;border:1px solid var(--line);border-radius:9px;overflow:hidden}.watch-heading{padding:23px 26px 19px}.watch-heading h1{font-size:23px;line-height:1.55;font-weight:600;margin:0 0 12px;overflow-wrap:anywhere}.watch-meta{display:flex;align-items:center;gap:18px;flex-wrap:wrap;font-size:13px;color:#8190a5;font-variant-numeric:tabular-nums;line-height:1.9}.watch-meta .pill{font-size:11px;color:var(--blue);background:#ecf5ff;padding:1px 7px;border-radius:4px}.watch-meta .date-pending{color:#a57b3a}.video-stage{background:#08111d;position:relative;display:flex;align-items:center;justify-content:center}.video-stage video{display:block;width:100%;aspect-ratio:16/9;max-height:min(67vh,calc(100svh - 310px));object-fit:contain;background:#08111d}.playback-status{font-size:13px;color:#8895a7;padding:10px 25px;line-height:1.8;background:#fff}.playback-status:empty{display:none}.playback-status.error{color:#a84b32}.lesson-info{padding:20px 26px 24px;border-top:1px solid var(--line)}.lesson-info h2{font-size:16px;margin:0 0 16px;font-weight:600}.topics{display:flex;gap:9px;flex-wrap:wrap}.topic{background:#f6f8fb;border-radius:5px;padding:7px 11px;font-size:12px;color:#74859b}.watch-sidebar{background:#fff;border:1px solid var(--line);border-radius:9px;padding:20px 17px}.watch-sidebar h2{font-size:16px;margin:0 0 19px;font-weight:600}.related-course{display:block;margin-bottom:21px}.related-course:last-child{margin-bottom:0}.related-course .course-picture{border-radius:5px}.related-course h3{font-size:13px;line-height:1.65;font-weight:500;margin:8px 0 4px;overflow-wrap:anywhere}.related-course .course-date{font-size:11px}.missing{padding:80px 0;text-align:center}.missing h1{font-size:23px;margin:0 0 25px}
@media(min-width:1500px){.course-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(max-width:1100px){.header-inner,.page{padding:0 24px}.header-inner{gap:30px}.brand{font-size:20px}.watch-layout{grid-template-columns:minmax(0,1fr) 225px}.watch-heading{padding:19px 22px}.watch-heading h1{font-size:21px}.watch-sidebar{padding:18px 14px}}
@media(max-width:900px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 20px}.header-search{width:220px}.header-inner{gap:25px;min-height:84px}.main-nav{gap:22px;font-size:14px}.brand{font-size:18px;gap:10px}.brand-mark{width:40px;height:40px;font-size:25px;border-radius:12px}.watch-layout{grid-template-columns:minmax(0,1fr)}.watch-sidebar{padding:21px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.watch-sidebar h2{grid-column:1/-1;margin:0}.related-course{margin:0}.watch-heading h1{font-size:22px}.course-card h2{font-size:16px}}
@media(max-width:620px){.header-inner,.page{padding:0 17px}.header-inner{flex-wrap:wrap;gap:0;min-height:auto;padding-top:16px;padding-bottom:0}.brand{font-size:18px}.main-nav{margin-left:auto;gap:20px;min-height:42px;align-self:auto}.main-nav a{align-self:stretch}.header-search{order:3;width:100%;margin:13px 0 16px}.section-top{margin:26px 0 20px}.section-top h1{font-size:22px}.category-bar{gap:8px;margin-bottom:23px}.category{min-width:0;font-size:12px;padding:7px 13px}.course-grid{grid-template-columns:1fr;gap:26px}.course-card h2{min-height:0;margin:12px 0 7px;font-size:16px}.course-date{font-size:12px}.watch-heading{padding:19px 17px 16px}.watch-heading h1{font-size:20px}.watch-meta{gap:8px 14px;font-size:12px}.watch-sidebar{grid-template-columns:repeat(2,minmax(0,1fr));padding:17px;gap:18px 13px}.related-course:last-child{display:none}.lesson-info{padding:20px 17px}.breadcrumbs{margin:18px 0}.playback-status{padding:10px 17px}.site-footer{margin-top:30px}}

.catalog-total{color:#94a1b1;font-size:13px}.catalog-card{position:relative;min-width:0}.favorite-button{border:1px solid #e2eaf3;border-radius:6px;background:#fff;color:#8a97a9;display:inline-flex;align-items:center;justify-content:center;gap:5px;padding:6px 10px;font-size:12px;cursor:pointer}.favorite-button>span:first-child{font-size:18px;line-height:1}.favorite-button.saved{color:#cb922b;border-color:#f1d8a7;background:#fffbf2}.favorite-button.compact{position:absolute;right:9px;top:9px;width:31px;height:31px;padding:0;border:0;background:#ffffffed;box-shadow:0 2px 9px #18304812;border-radius:50%;opacity:0}.catalog-card:hover .favorite-button.compact,.favorite-button.compact.saved,.favorite-button.compact:focus-visible{opacity:1}.watch-meta .favorite-button{margin-left:auto}.pagination{display:flex;gap:8px;justify-content:center;align-items:center;margin:42px 0 10px;flex-wrap:wrap}.pagination button{border:1px solid var(--line);background:#fff;border-radius:5px;min-width:35px;height:35px;padding:0 11px;font-size:13px;color:#7c8ea3}.pagination button.active{background:var(--blue);border-color:var(--blue);color:#fff}.pagination button:disabled{opacity:.4;cursor:default}.pagination>span{color:#9aa6b6}.watch-layout{grid-template-columns:minmax(0,1fr) 350px}.episode-number{display:inline-block;background:#edf5ff;color:#3287e6;font-size:12px;border-radius:4px;padding:3px 7px;font-weight:400;margin-right:10px;vertical-align:middle}.resume-prompt{display:flex;gap:12px;align-items:center;background:#f2f7ff;padding:10px 24px;font-size:12px;color:#6d839e}.resume-prompt[hidden]{display:none}.resume-prompt button{background:none;border:0;color:var(--blue);font-size:12px;padding:0}.resume-prompt button:last-child{margin-left:auto;font-size:18px}.playback-status button{border:0;padding:0;color:var(--blue);background:none;font:inherit}
.course-community{height:min(780px,calc(100svh - 170px));min-height:540px;border:1px solid var(--line);border-radius:9px;background:#fff;display:flex;flex-direction:column;overflow:hidden;position:relative}.community-tabs{display:flex;border-bottom:1px solid var(--line);padding:0 19px;gap:27px;flex:none}.community-tab{position:relative;border:0;background:none;font-size:14px;padding:20px 0 16px;color:#8a97a9}.community-tab.active{color:var(--blue);font-weight:600}.community-tab.active:after{content:"";position:absolute;bottom:-1px;left:0;right:0;height:2px;background:var(--blue)}.chat-panel{display:flex;flex:1;min-height:0;flex-direction:column;position:relative}.chat-panel[hidden],.lessons-panel[hidden]{display:none}.chat-heading{display:flex;align-items:center;justify-content:space-between;padding:14px 17px 8px;font-size:11px;color:#99a6b6;flex:none}.chat-heading>span:first-child{color:#5c718c;font-size:12px;display:flex;gap:6px;align-items:center}.connection-dot{width:6px;height:6px;border-radius:50%;background:#b5bdc8;display:inline-block}.connection-dot.connected{background:#63b99b}.example-notice{margin:0 15px 9px;padding:7px 8px;font-size:10px;color:#9e8a66;background:#fffbf3;border:1px solid #f5ead6;border-radius:4px;display:flex;gap:6px;align-items:center;justify-content:space-between;line-height:1.6;flex:none}.example-notice button{font-size:10px;white-space:nowrap;background:none;border:0;color:#9e8a66;text-decoration:underline;padding:0}.chat-messages{overflow-y:auto;overscroll-behavior:contain;min-height:0;flex:1;padding:5px 14px 15px;scrollbar-width:thin;scrollbar-color:#dfe7f1 transparent}.chat-message{display:flex;gap:9px;margin-top:17px}.chat-message:first-child{margin-top:3px}.avatar{display:grid;place-items:center;flex:none;width:30px;height:30px;border-radius:50%;font-size:10px;color:#63758b;font-weight:500;letter-spacing:-.5px}.message-content{flex:1;min-width:0}.message-author{display:flex;align-items:center;gap:7px;color:#8695a9;font-size:10px;line-height:1.6;margin:0 0 5px}.message-author>span{overflow:hidden;white-space:nowrap;text-overflow:ellipsis;max-width:170px}.message-author>small{font-size:9px;color:#a9b3c1;white-space:nowrap}.message-author .example-label{border:1px solid #e6eaf0;border-radius:3px;font-size:9px;padding:0 3px;color:#a3aebb}.message-bubble{background:#f4f7fa;display:inline-block;max-width:100%;margin:0;border-radius:0 7px 7px 7px;padding:8px 10px;color:#65758b;font-size:12px;line-height:1.75;overflow-wrap:anywhere;white-space:pre-wrap}.mine .message-bubble{background:#eaf3ff;color:#4374ad}.mine .message-author>span{color:#4b8bd7}.message-image{display:block;background:none;border:0;padding:0;margin-top:7px;max-width:100%;text-align:left}.message-image img{max-width:180px;max-height:180px;object-fit:contain;border-radius:7px;display:block;border:1px solid #edf0f5}.chat-empty{display:flex;align-items:center;justify-content:center;min-height:200px;color:#a1adbd;font-size:12px;text-align:center}.new-messages{position:absolute;bottom:205px;right:17px;border:1px solid #d2e4ff;border-radius:20px;padding:7px 12px;color:var(--blue);font-size:11px;background:#fff;box-shadow:0 2px 12px #23476b0d;z-index:2}.new-messages[hidden]{display:none}.chat-status{font-size:11px;line-height:1.7;padding:0 15px 7px;color:#9ba7b7;flex:none}.chat-status:empty{display:none}.chat-status.error{color:#bb7156}.chat-form{border-top:1px solid var(--line);padding:11px 14px 12px;flex:none}.chat-identity{display:flex;align-items:center;gap:6px;margin-bottom:9px;color:#a2adbc;font-size:10px}.own-avatar{width:23px;height:23px;font-size:9px;margin-right:2px}.chat-identity input{width:180px;min-width:0;border:0;border-bottom:1px solid transparent;font-size:11px;color:#6e819b;outline:none;background:none;padding:2px 0}.chat-identity input:focus{border-bottom-color:#8ebcf7}.chat-form textarea{display:block;width:100%;height:59px;resize:none;border:1px solid #e8edf3;border-radius:6px;padding:9px;font-size:12px;line-height:1.7;color:#61728a;background:#fbfcfe;outline:none}.chat-form textarea:focus{border-color:#a3c8f9;background:#fff}.chat-form textarea::placeholder{color:#a4afbf}.composer-actions{display:flex;align-items:center;gap:10px;margin-top:8px}.image-attach{border:0;background:none;display:flex;gap:5px;align-items:center;padding:0;font-size:11px;color:#93a3b8}.image-attach svg{width:20px;height:20px}.character-count{font-size:10px;color:#b0b9c6;margin-left:auto}.send-message{background:var(--blue);color:#fff;font-size:12px;border:0;border-radius:5px;padding:8px 20px}.send-message:disabled{opacity:.5;cursor:wait}.attachment-preview{position:relative;display:inline-block;margin-bottom:9px}.attachment-preview[hidden]{display:none}.attachment-preview img{width:60px;height:60px;object-fit:cover;border-radius:6px;border:1px solid #e6ecf4}.attachment-preview button{position:absolute;top:-5px;right:-5px;border:0;background:#8b9bb2;color:#fff;border-radius:50%;width:17px;height:17px;padding:0;font-size:13px;line-height:17px}.lessons-panel{overflow-y:auto;overscroll-behavior:contain;padding:17px;scrollbar-width:thin}.lessons-panel h2{font-size:13px;font-weight:500;color:#9ba8b9;margin:0 0 18px}.lessons-panel .related-course{margin-bottom:23px}.lessons-panel .related-course h3{font-size:13px}.lessons-panel .replay-badge{font-size:10px;padding:4px 10px}.chat-lightbox{max-width:92vw;max-height:92vh;border:0;border-radius:9px;background:#132035;padding:12px;overflow:visible}.chat-lightbox::backdrop{background:#091323c9}.chat-lightbox img{display:block;max-width:85vw;max-height:84vh;object-fit:contain}.chat-lightbox button{position:absolute;top:-12px;right:-12px;width:30px;height:30px;border:0;border-radius:50%;background:#fff;color:#65758a;font-size:22px;box-shadow:0 2px 12px #0002}
@media(max-width:1100px){.watch-layout{grid-template-columns:minmax(0,1fr) 310px}.header-inner{gap:28px}.main-nav{gap:23px}.header-search{width:210px}.chat-identity input{width:160px}}
@media(max-width:900px){.watch-layout{grid-template-columns:1fr}.course-community{height:650px;min-height:530px}.chat-message{margin-top:19px}.message-author>span{max-width:none}.message-bubble{font-size:13px}.avatar{width:33px;height:33px;font-size:11px}.chat-identity .own-avatar{width:23px;height:23px;font-size:9px}.chat-form textarea{height:70px}.new-messages{bottom:220px}.header-inner{gap:20px}.main-nav{gap:18px}.header-search{width:190px}.brand{font-size:17px}}
@media(max-width:700px){.header-inner{flex-wrap:wrap;gap:12px;padding-top:15px}.main-nav{margin-left:auto;align-self:stretch}.header-search{width:100%;order:3;margin-bottom:16px}.catalog-total{font-size:11px}.section-top{gap:10px}.favorite-button.compact{opacity:1}.watch-meta .favorite-button{margin-left:0}.pagination{gap:5px}.pagination button{padding:0 8px;min-width:31px}.course-community{height:660px}.episode-number{font-size:11px}.watch-heading h1{font-size:20px}.message-image img{max-width:230px}}
.header-search{flex:1;min-width:130px;max-width:260px}.account-button{flex:none;border:1px solid #dbe9fc;color:#4388e1;background:#f8fbff;border-radius:6px;padding:9px 12px;font-size:12px;max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.account-button.signed-in{background:#edf5ff}.site-footer .icp{display:inline-block;margin-left:20px}.chat-identity #chat-identity-name{font-size:11px;color:#8b9bb0}.auth-dialog{position:fixed;max-width:calc(100vw - 32px);width:400px;border:1px solid #e3eaf4;border-radius:14px;background:#fff;padding:30px 32px;box-shadow:0 18px 80px #0b254726;color:#21334a}.auth-dialog::backdrop{background:#142a485e;backdrop-filter:blur(2px)}.auth-close{position:absolute;right:14px;top:12px;border:0;background:none;color:#a0adbd;font-size:24px;padding:0 4px}.auth-brand{width:44px;height:44px;border-radius:12px;background:#edf5ff;display:grid;place-items:center;color:var(--blue);font-size:27px;font-weight:700;margin-bottom:18px}.auth-dialog h2{font-size:20px;margin:0 0 8px;line-height:1.6;font-weight:600}.auth-subtitle,.profile-username{font-size:12px;color:#9aa7b9;margin:0 0 20px}.auth-tabs{display:flex;border-bottom:1px solid var(--line);gap:25px;margin-bottom:20px}.auth-tabs button{padding:0 0 12px;border:0;background:none;color:#9aa7b9;font-size:14px;position:relative}.auth-tabs button.active{color:var(--blue)}.auth-tabs button.active:after{content:"";position:absolute;bottom:-1px;height:2px;left:0;right:0;background:var(--blue)}.auth-dialog label{font-size:12px;color:#7e8fa4;display:block;margin-bottom:7px}.auth-dialog input{display:block;width:100%;border:1px solid #e0e7f1;border-radius:6px;font-size:13px;padding:11px 12px;color:#536981;margin-bottom:16px;background:#fcfdff}.auth-dialog input:focus{outline:none;border-color:#83b9ff;background:#fff}.auth-dialog input::placeholder{color:#b2bdcb;font-size:12px}.auth-error{font-size:12px;color:#bc7059;line-height:1.7;margin:0 0 12px}.auth-error:empty{display:none}.auth-submit{width:100%;padding:12px;background:var(--blue);color:white;border:0;border-radius:6px;font-size:14px;margin-top:6px}.auth-submit:disabled{opacity:.6;cursor:wait}.profile-avatar{width:64px;height:64px;display:grid;place-items:center;border-radius:50%;background:#edf5ff;color:var(--blue);font-size:22px;margin:10px 0 20px}.profile-username{margin-bottom:25px}
@media(max-width:800px){.header-inner{flex-wrap:wrap;gap:12px;padding-top:15px}.main-nav{order:3;width:100%;min-height:38px;gap:25px}.header-search{order:4;max-width:none;margin:0 0 16px}.account-button{order:4;margin-bottom:16px}.brand{width:100%}.site-footer .icp{display:block;margin:9px 0 0}.auth-dialog{padding:28px 24px}.new-messages{bottom:220px}}