:root{color:#172033;font-synthesis:none;background:#f4f6f9;font-family:Inter,Microsoft YaHei UI,Yu Gothic UI,system-ui,sans-serif}*{box-sizing:border-box}body{background:#f4f6f9;margin:0}button,input,select,textarea{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}.app-shell{min-height:100vh;display:flex}.sidebar{color:#fff;background:#111827;flex-direction:column;width:238px;padding:22px 16px;display:flex;position:fixed;inset:0 auto 0 0}.brand{align-items:center;gap:12px;display:flex}.brand.compact{gap:8px}.brand span{color:#8e9ab0;margin-top:3px;font-size:11px;display:block}.brand-mark{color:#fff;background:linear-gradient(135deg,#6d5dfc,#2c9cff);border-radius:12px;place-items:center;width:38px;height:38px;font-weight:800;display:grid}.brand-mark.large{border-radius:18px;width:56px;height:56px}.sidebar nav{flex-direction:column;gap:6px;margin-top:30px;display:flex}.sidebar nav a{color:#bfc7d5;border-radius:10px;padding:11px 13px;font-size:14px}.sidebar nav a.router-link-exact-active,.sidebar nav a:hover{color:#fff;background:#202a3a}.sidebar-foot{flex-direction:column;gap:10px;margin-top:auto;display:flex}.main-panel{width:calc(100% - 238px);min-height:100vh;margin-left:238px;padding:28px}.page-head{justify-content:space-between;align-items:flex-start;margin-bottom:22px;display:flex}.page-head h1{margin:0;font-size:25px}.page-head p{color:#778196;margin:6px 0 0}.primary,.ghost,.lang-switch,.icon-btn,.link{border:0}.primary{color:#fff;background:#635bff;border-radius:9px;padding:9px 16px;font-weight:700}.primary.big{width:100%;padding:13px}.primary:disabled{opacity:.5;cursor:not-allowed}.ghost,.lang-switch{color:#485267;background:#fff;border:1px solid #dfe4ec;border-radius:9px;padding:8px 12px}.sidebar .ghost,.sidebar .lang-switch{color:#dbe2ee;background:#182132;border-color:#2c3648}.full{width:100%}.link{color:#525cff;background:0 0;padding:5px}.danger{color:#e44f5e!important}.card{background:#fff;border:1px solid #e7eaf0;border-radius:16px;padding:20px;box-shadow:0 2px 8px #19233708}.metric-grid{grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px;display:grid}.metric-card{background:#fff;border:1px solid #e7eaf0;border-radius:16px;padding:20px}.metric-card span{color:#7a8497;font-size:13px}.metric-card strong{margin-top:9px;font-size:30px;display:block}.grid-2{grid-template-columns:1fr 1fr;gap:16px;display:grid}.status-list p{border-bottom:1px solid #eef1f5;justify-content:space-between;align-items:center;margin:0;padding:10px 0;display:flex}.ok{color:#19966d}.bad{color:#d84f5b}.muted{color:#8590a4}.tiny{font-size:11px}.flow-list{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.flow-list span{color:#5149dd;background:#f0f1ff;border-radius:9px;padding:8px 11px}.table-card{padding:0;overflow:hidden}table{border-collapse:collapse;width:100%;font-size:13px}th,td{text-align:left;border-bottom:1px solid #edf0f4;padding:13px 14px}th{color:#778196;background:#fafbfd;font-size:12px}.modal-backdrop{z-index:50;background:#0d141f7a;place-items:center;padding:20px;display:grid;position:fixed;inset:0}.modal{background:#fff;border-radius:18px;width:min(720px,96vw);max-height:90vh;overflow:auto}.modal-head{border-bottom:1px solid #eee;justify-content:space-between;align-items:center;padding:18px 20px;display:flex}.modal-head h3{margin:0}.icon-btn{background:0 0;font-size:24px}.modal-body{padding:20px}.modal-actions{justify-content:flex-end;margin-top:18px;display:flex}.form-grid{grid-template-columns:1fr 1fr;gap:14px;display:grid}.form-grid label,.card label{color:#6f798b;flex-direction:column;gap:6px;font-size:12px;display:flex}.span-2{grid-column:span 2}input,select,textarea{color:#1e2635;background:#fff;border:1px solid #dce1e9;border-radius:9px;width:100%;padding:9px 10px}textarea{resize:vertical}.course-grid{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.course-card{cursor:pointer;background:#fff;border:1px solid #e5e9ef;border-radius:17px;padding:20px;transition:all .2s}.course-card:hover{transform:translateY(-2px);box-shadow:0 12px 30px #28325014}.course-card h3{margin:14px 0 8px}.course-card p{color:#7b8495;min-height:42px}.course-type{color:#2873d2;background:#eef5ff;border-radius:99px;padding:5px 9px;font-size:11px;display:inline-block}.course-type.ai{color:#6553da;background:#f0edff}.card-foot{justify-content:space-between;align-items:center;display:flex}.badge{color:#667085;background:#eef1f6;border-radius:99px;padding:4px 8px;font-size:11px;display:inline-flex}.badge.ongoing{color:#148a61;background:#e8f8f1}.badge.upcoming{color:#315fbd;background:#eef3ff}.badge.ended{color:#8c9099;background:#f2f2f3}.inline-actions,.inline-form,.upload-line{align-items:center;gap:8px;display:flex}.lesson-stack{flex-direction:column;gap:16px;display:flex}.lesson-card{padding:0;overflow:hidden}.lesson-head{border-bottom:1px solid #edf0f5;justify-content:space-between;align-items:flex-start;padding:18px 20px;display:flex}.lesson-head h3{margin:5px 0}.eyebrow{color:#6d5dfc;font-size:11px}.sub-card{padding:18px 20px}.sub-card h4{margin-top:0}.media-row{border-bottom:1px solid #eee;justify-content:space-between;padding:8px 0;display:flex}.inline-form{margin-top:12px}.upload-line{margin-top:10px}.page-preview{grid-template-columns:repeat(4,1fr);gap:12px;padding:0 20px 20px;display:grid}.page-thumb{background:#fafbfc;border:1px solid #e5e9ef;border-radius:12px;overflow:hidden}.page-thumb img{aspect-ratio:16/9;object-fit:cover;background:#eee;width:100%}.page-thumb>div,.page-thumb p{margin:0;padding:7px 9px}.page-thumb>div{justify-content:space-between;font-size:11px;display:flex}.page-thumb p{color:#727c8d;font-size:11px;line-height:1.5}.notice{color:#5750a4;background:#f5f5ff;border-radius:10px;margin:18px 20px;padding:14px;font-size:13px}.notice.warning{color:#8b6420;background:#fff7e7;margin:15px 0}.check-grid{grid-template-columns:repeat(3,1fr);gap:8px;margin-top:7px;display:grid}.check-item{background:#f8f9fb;border-radius:8px;padding:8px;flex-direction:row!important;align-items:center!important}.check-item input{width:auto}.field-label{color:#6f798b;font-size:12px}.json-box{white-space:pre-wrap;color:#d9e3f1;background:#111827;border-radius:10px;max-height:280px;padding:12px;font-size:11px;overflow:auto}.learner-shell{min-height:100vh}.learner-header{z-index:10;background:#fff;border-bottom:1px solid #e7eaf0;justify-content:space-between;align-items:center;height:68px;padding:0 28px;display:flex;position:sticky;top:0}.header-actions{align-items:center;gap:10px;display:flex}.user-name{color:#687286;font-size:13px}.learner-main{max-width:1100px;margin:0 auto;padding:34px 22px}.my-course-grid{grid-template-columns:1fr;gap:14px;display:grid}.meeting-card{background:#fff;border:1px solid #e5e9ef;border-radius:17px;grid-template-columns:180px 1fr 130px;align-items:center;gap:20px;padding:20px;display:grid}.meeting-time{border-right:1px solid #edf0f5;flex-direction:column;gap:5px;display:flex}.meeting-time span{color:#778196;font-size:13px}.meeting-card h2{margin:8px 0 4px}.meeting-card p{color:#7a8497;margin:0}.empty-state{text-align:center;color:#8791a3;padding:80px 20px}.empty-state>div{font-size:46px}.login-page{background:#fff;grid-template-columns:1.15fr .85fr;min-height:100vh;display:grid}.login-visual{color:#fff;background:linear-gradient(145deg,#121a2c,#22294b);position:relative;overflow:hidden}.visual-orb{filter:blur(4px);opacity:.45;border-radius:50%;position:absolute}.orb1{background:#6055ff;width:430px;height:430px;top:-120px;left:-120px}.orb2{background:#1ca4ff;width:330px;height:330px;bottom:-80px;right:-80px}.login-copy{z-index:2;max-width:670px;padding:10vh 10%;position:relative}.login-copy h1{margin:26px 0 8px;font-size:46px}.login-copy>p{color:#b7c0d2;margin-bottom:50px;font-size:18px}.feature-row{align-items:center;gap:16px;margin:22px 0;display:flex}.feature-row>span{color:#96a7c5;border:1px solid #52607b;border-radius:12px;place-items:center;width:40px;height:40px;display:grid}.feature-row small{color:#94a0b7;margin-top:4px;display:block}.login-panel{place-items:center;padding:30px;display:grid}.login-box{width:min(390px,100%)}.login-top{text-align:right}.login-box h2{margin-bottom:5px;font-size:30px}.login-box>p{color:#8790a1;margin-bottom:28px}.login-box label{color:#6b7587;margin:12px 0 6px;font-size:12px;display:block}.error-box{color:#c23f50;background:#fff0f2;border-radius:8px;margin:12px 0;padding:10px}.login-box .primary{margin-top:16px}.classroom{color:#fff;background:#10151f;height:100vh;overflow:hidden}.classroom-top{border-bottom:1px solid #28303e;justify-content:space-between;align-items:center;height:64px;padding:0 18px;display:flex}.classroom-top .ghost,.classroom-top .lang-switch,.classroom-top select{color:#dce4ef;background:#1a2230;border-color:#303a4a;width:auto}.classroom-actions{align-items:center;gap:8px;display:flex}.classroom-grid{grid-template-columns:minmax(0,1fr) 330px;height:calc(100vh - 64px);display:grid}.stage-wrap{flex-direction:column;min-width:0;display:flex}.stage{background:#0b0f16;flex:1;place-items:center;display:grid;position:relative;overflow:hidden}.slide-image{object-fit:contain;max-width:96%;max-height:94%;box-shadow:0 10px 40px #0000004d}.video-player{background:#000;width:100%;height:100%}.stage-empty{color:#8190a5}.subtitle-overlay{text-align:center;background:#000000b8;border-radius:8px;padding:10px 14px;font-size:17px;line-height:1.5;position:absolute;bottom:32px;left:10%;right:10%}.stage-badge{background:#0000008c;border-radius:8px;padding:6px 9px;font-size:11px;position:absolute;top:16px;right:18px}.lesson-bar{background:#151b25;border-top:1px solid #252d3a;justify-content:space-between;align-items:center;height:72px;padding:0 15px;display:flex}.lesson-tabs{gap:7px;display:flex;overflow-x:auto}.lesson-tabs button{color:#9daabd;white-space:nowrap;background:#202835;border:0;border-radius:8px;padding:8px 10px}.lesson-tabs button.active{color:#fff;background:#6056e9}.lecture-state{color:#a9b4c4;align-items:center;gap:7px;font-size:12px;display:flex}.lecture-state span{background:#697487;border-radius:50%;width:8px;height:8px}.lecture-state .pulse{background:#28c78b;box-shadow:0 0 0 5px #28c78b24}.classroom-side{background:#151b25;border-left:1px solid #252d3a;flex-direction:column;display:flex;overflow:hidden}.side-section{padding:15px}.side-section h3{justify-content:space-between;margin:0 0 12px;font-size:13px;display:flex}.participants{border-bottom:1px solid #252d3a;max-height:42%;overflow:auto}.person{grid-template-columns:34px 1fr auto;align-items:center;gap:8px;margin:9px 0;display:grid}.person b{font-size:12px}.person small{color:#9aa6b7;background:#242e3c;border-radius:5px;padding:3px 5px;font-size:9px}.avatar{color:#dce4ef;background:#313c4e;border-radius:50%;place-items:center;width:34px;height:34px;font-size:12px;display:grid}.qa{flex-direction:column;flex:1;min-height:0;display:flex}.chat-list{flex-direction:column;flex:1;gap:8px;display:flex;overflow:auto}.chat{background:#202835;border-radius:10px;padding:9px 10px;font-size:12px}.chat.user{background:#30336b}.chat small{color:#9cabc0}.chat p{margin:4px 0 0;line-height:1.5}.ask-box{margin-top:10px}.ask-box textarea{color:#fff;background:#0f141d;border-color:#303a4a;min-height:78px}.ask-box .primary{width:100%;margin-top:7px}.loading-screen{place-items:center;height:100vh;display:grid}.classroom .muted{color:#8e9bad}@media (width<=1000px){.metric-grid,.course-grid,.page-preview{grid-template-columns:repeat(2,1fr)}.classroom-grid{grid-template-columns:1fr 280px}.meeting-card{grid-template-columns:150px 1fr 110px}}@media (width<=760px){.sidebar{display:none}.main-panel{width:100%;margin:0;padding:18px}.grid-2,.form-grid{grid-template-columns:1fr}.span-2{grid-column:span 1}.course-grid{grid-template-columns:1fr}.metric-grid{grid-template-columns:1fr 1fr}.login-page{grid-template-columns:1fr}.login-visual{display:none}.learner-header{padding:0 14px}.user-name{display:none}.learner-main{padding:22px 14px}.meeting-card{grid-template-columns:1fr}.meeting-time{border-bottom:1px solid #edf0f5;border-right:0;padding-bottom:10px}.classroom{height:auto;min-height:100vh;overflow:auto}.classroom-grid{height:auto;display:block}.stage-wrap{height:62vh}.classroom-side{border-top:1px solid #252d3a;border-left:0;min-height:38vh}.participants{display:none}.qa{height:38vh}.subtitle-overlay{font-size:14px;bottom:20px;left:4%;right:4%}.classroom-top strong{white-space:nowrap;text-overflow:ellipsis;max-width:170px;overflow:hidden}.classroom-actions select{max-width:90px}}.processing-text{color:#9a67d8}.clickable{cursor:pointer}.edit-hint{color:#6d5dfc;padding:0 9px 9px;font-size:10px;display:block}.compact-notice{margin:12px 0 0!important}.video-admin-preview{padding:0 20px 16px}.video-admin-preview video{background:#0b0f16;border-radius:12px;width:min(820px,100%);max-height:420px}.timeline-wrap{border:1px solid #e5e9ef;border-radius:12px;margin:0 20px 20px;overflow:hidden}.timeline-head{background:#f8f9fc;justify-content:space-between;padding:12px 14px;font-size:12px;display:flex}.timeline-row{border-top:1px solid #edf0f4;grid-template-columns:44px 150px minmax(220px,1fr) 70px 55px;align-items:center;gap:10px;padding:11px 14px;font-size:12px;display:grid}.timeline-no{color:#6255d8;background:#eeeafd;border-radius:50%;place-items:center;width:30px;height:30px;font-weight:700;display:grid}.timeline-time{flex-direction:column;gap:2px;font-family:ui-monospace,monospace;display:flex}.timeline-time small{color:#8a94a5}.timeline-text{color:#4d5768;max-height:48px;line-height:1.55;overflow:hidden}.timeline-tts{font-size:11px}.one-col{grid-template-columns:1fr!important}.gap-actions{gap:8px}.ai-video-progress{background:#ffffff26;height:4px;position:absolute;bottom:0;left:0;right:0}.ai-video-progress span{background:#7167ef;height:100%;transition:width .15s linear;display:block}@media (width<=760px){.timeline-row{grid-template-columns:36px 115px 1fr}.timeline-tts,.timeline-row>.link{grid-column:auto}.timeline-text{grid-column:1/-1;max-height:none}}.table-actions{white-space:nowrap;align-items:center;gap:7px;display:flex}.course-teacher{color:#667085;align-items:center;gap:8px;margin:12px 0;font-size:12px;display:flex}.mini-avatar{color:#5f56d9;background:#edeaff;border-radius:50%;place-items:center;width:26px;height:26px;font-weight:700;display:inline-grid}.course-settings-card{margin-bottom:16px}.teacher-summary,.teacher-cell{align-items:center;gap:10px;display:flex}.teacher-summary small,.teacher-cell small{color:#8a94a5;margin-top:3px;display:block}.teacher-avatar{color:#5f55da;background:#ece9ff}.teacher-header{border-bottom-color:#dfdced}.classroom-page{color:#fff;background:#10151f;height:100vh;overflow:hidden}.classroom-topbar{border-bottom:1px solid #28303e;justify-content:space-between;align-items:center;height:64px;padding:0 18px;display:flex}.classroom-title{align-items:center;gap:10px;display:flex}.classroom-title .ghost,.classroom-topbar .lang-switch,.classroom-topbar select{color:#dce4ef;background:#1a2230;border-color:#303a4a;width:auto}.classroom-title small{color:#8f9bad;margin-top:3px;font-size:10px;display:block}.classroom-tools{align-items:center;gap:10px;display:flex}.classroom-tools label{color:#9da8b9;align-items:center;gap:7px;font-size:11px;display:flex}.classroom-body{grid-template-columns:minmax(0,1fr) 350px;height:calc(100vh - 64px);display:grid}.classroom-stage-wrap{flex-direction:column;min-width:0;display:flex;position:relative}.classroom-stage{background:#0b0f16;flex:1;place-items:center;display:grid;position:relative;overflow:hidden}.teacher-presence{z-index:6;-webkit-backdrop-filter:blur(7px);backdrop-filter:blur(7px);background:#111827d6;border:1px solid #ffffff1a;border-radius:12px;align-items:center;gap:10px;padding:8px 12px;display:flex;position:absolute;top:12px;left:14px}.teacher-avatar-large{background:linear-gradient(135deg,#6257e9,#2d9ef0);border-radius:50%;place-items:center;width:42px;height:42px;font-weight:800;display:grid;overflow:hidden}.teacher-avatar-large img{object-fit:cover;width:100%;height:100%}.teacher-presence small{color:#9aa6b7;font-size:9px;display:block}.teacher-presence b{font-size:12px;display:block}.teacher-live-dot{color:#78869a;margin-top:2px;font-size:9px;display:inline-block}.teacher-live-dot.active{color:#2ec98c}.start-overlay{z-index:12;background:#070a0fc2;place-items:center;display:grid;position:absolute;inset:0}.start-card{text-align:center;background:#171e29;border:1px solid #2d3746;border-radius:18px;width:min(360px,90%);padding:28px}.start-card h2{margin:10px 0 7px}.start-card p{color:#9da8b9;font-size:12px}.start-icon{background:#6258e9;border-radius:50%;place-items:center;width:54px;height:54px;margin:auto;padding-left:3px;display:grid}.participant-head{justify-content:space-between;align-items:flex-start;gap:8px;display:flex}.moderator-actions{gap:4px;display:flex}.mini-btn,.mic-toggle,.voice-button{color:#dce4ef;background:#202937;border:1px solid #344052;border-radius:8px;padding:6px 8px;font-size:10px}.mini-btn:hover,.mic-toggle:hover{background:#2a3545}.mic-toggle.off{color:#f3c36b}.person-main{min-width:0}.person-main b{display:block}.mic-state{font-size:12px}.mic-state.off{opacity:.55}.teacher-person{border-bottom:1px dashed #2c3542;padding:6px 0}.voice-question-box{align-items:center;gap:8px;min-height:34px;margin-top:10px;display:flex}.voice-button{background:#273247;flex:none;padding:8px 11px}.voice-button.recording{background:#8f2f3c;border-color:#b64a59}.voice-button:disabled{opacity:.45;cursor:not-allowed}.recording-label{color:#ef8996;font-size:10px;animation:1s infinite pulseText}.muted-label{color:#b5a06c;font-size:10px}@keyframes pulseText{50%{opacity:.5}}.classroom-page .muted{color:#8e9bad}@media (width<=1000px){.classroom-body{grid-template-columns:1fr 300px}}@media (width<=760px){.classroom-page{height:auto;min-height:100vh;overflow:auto}.classroom-topbar{padding:0 10px}.classroom-title b{white-space:nowrap;text-overflow:ellipsis;max-width:145px;display:block;overflow:hidden}.classroom-body{height:auto;display:block}.classroom-stage-wrap{height:62vh}.classroom-side{border-top:1px solid #252d3a;border-left:0;min-height:38vh}.participants{max-height:190px;display:block}.qa{height:42vh}.teacher-presence{transform-origin:0 0;transform:scale(.88)}.classroom-tools label{display:none}}.teacher-avatar img,.teacher-avatar-large img{object-fit:cover;border-radius:inherit;width:100%;height:100%;display:block}.rtc-pill{color:#667085;white-space:nowrap;background:#eef2f7;border-radius:999px;padding:7px 10px;font-size:12px}.rtc-pill.connected{color:#027a48;background:#ecfdf3}.rtc-pill.error{color:#b42318;background:#fef3f2}.human-teacher-state{color:#667085;margin-left:8px;font-size:11px;display:inline-block}.human-teacher-state.online{color:#12b76a}.online-state{color:#98a2b3}.online-state.online{color:#12b76a}.online-count{color:#667085;font-size:12px}.realtime-audio{border-top:1px solid #eaecf0}.live-mic-button{color:#344054;cursor:pointer;background:#f2f4f7;border:0;border-radius:12px;width:100%;padding:11px 12px;font-weight:700}.live-mic-button.on{color:#b42318;background:#fee4e2;box-shadow:inset 0 0 0 2px #f044381f}.live-mic-button:disabled{opacity:.45;cursor:not-allowed}.rtc-error{color:#b42318;margin:8px 0 0;font-size:12px}.person.speaking{transition:all .2s}.person:has(.online-state.online){transition:all .2s}.mic-state.on{filter:saturate(1.2)}@media (width<=900px){.rtc-pill{display:none}.realtime-audio{z-index:3;background:#fff;position:sticky;bottom:0}}.rtc-audio-unlock{width:100%;margin-top:8px}.playback-admin-bar{background:#f7f9fc;border-top:1px solid #e7ebf0;flex-wrap:wrap;align-items:center;gap:8px;padding:10px 12px;display:flex}.playback-admin-bar .muted{margin-left:auto}.rtc-pill.connected{white-space:nowrap}
