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#edf0f3;align-items:flex-start;gap:11px;padding:13px 15px;display:flex}.material-row:hover{background:#f8fafc}.material-row--selected{box-shadow:inset 3px 0 var(--blue);background:#eef4ff}.material-kind{color:#285b9f;background:#e5effd;border-radius:7px;flex:none;place-items:center;width:38px;height:38px;display:grid}.material-kind--task{color:#87520d;background:#fff0d8}.material-kind--link{color:#246f5a;background:#e3f4ee}.material-kind--file{color:#73479d;background:#f0e8f8}.material-row__content{gap:4px;min-width:0;display:grid}.material-row__content strong,.material-row__content small{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.material-row__content strong{font-size:13px}.material-row__content small{color:var(--muted);font-size:11px}.tag-line{gap:5px;min-height:17px;display:flex}.tag-line em{color:#607185;font-size:10px;font-style:normal}.material-preview{min-width:0;padding:28px 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small{color:var(--muted);font-size:11px}.student-progress-panel{grid-column:1/-1;grid-template-columns:46px 1fr auto;align-items:center;gap:13px;min-height:102px;display:grid}.student-progress-panel__icon{width:44px;height:44px;color:var(--green);background:#e5f5ef;border-radius:50%;place-items:center;display:grid}.student-progress-panel h2{color:var(--muted);margin:0 0 4px;font-size:12px}.student-progress-panel strong{font-size:24px}.student-progress-panel a{color:var(--blue);font-size:13px;font-weight:650}.student-assignment-grid,.student-material-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;display:grid}.student-assignment-card{border:1px solid var(--line);background:#fff;border-radius:8px;flex-direction:column;min-width:0;min-height:220px;padding:19px;display:flex}.student-assignment-card__top{justify-content:space-between;align-items:center;display:flex}.student-assignment-card h2{margin:18px 0 8px;font-size:16px}.student-assignment-card p{color:#526071;-webkit-line-clamp:3;-webkit-box-orient:vertical;margin-bottom:20px;font-size:13px;line-height:1.5;display:-webkit-box;overflow:hidden}.student-assignment-card__bottom{justify-content:space-between;align-items:center;gap:10px;margin-top:auto;display:flex}.student-assignment-card__bottom>span{color:var(--muted);align-items:center;gap:5px;font-size:11px;display:flex}.assignment-dialog{gap:17px;display:grid}.notice svg{vertical-align:text-bottom}.student-material-card{border:1px solid var(--line);min-width:0;min-height:112px;color:var(--ink);cursor:pointer;text-align:left;background:#fff;border-radius:8px;grid-template-columns:40px minmax(0,1fr) 18px;align-items:flex-start;gap:12px;padding:16px;display:grid}.student-material-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-card-hover)}.student-material-card__content{gap:5px;min-width:0;display:grid}.student-material-card__content small{color:var(--muted);text-transform:uppercase;font-size:10px;font-weight:700}.student-material-card__content strong,.student-material-card__content>span{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.student-material-card__content strong{font-size:14px}.student-material-card__content>span{color:var(--muted);font-size:12px}.student-material-card>svg{color:var(--muted)}.mobile-material-overlay{z-index:25;justify-content:flex-end;display:flex;position:fixed;inset:0}.mobile-material-overlay .sidebar-backdrop{display:block}.student-material-detail{z-index:26;width:min(520px,92vw);box-shadow:var(--shadow-side-panel);background:#fff;padding:30px;position:relative;overflow:auto}.student-material-detail .detail-close{float:right;color:var(--blue);cursor:pointer;background:0 0;border:0;font-size:13px;font-weight:650}.student-material-detail>small{color:var(--muted);text-transform:uppercase;margin:14px 0 5px;font-size:11px;font-weight:700;display:block}.student-material-detail h2{margin-bottom:18px}.admin-summary{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-bottom:20px;display:grid}.admin-summary>div{border:1px solid var(--line);background:#fff;border-radius:7px;grid-template-columns:38px 1fr auto;align-items:center;gap:10px;min-height:82px;padding:15px;display:grid}.admin-summary__icon{width:36px;height:36px;color:var(--blue);background:#e8f0ff;border-radius:6px;place-items:center;display:grid}.admin-summary__icon--green{color:var(--green);background:#e6f5ef}.admin-summary__icon--gray{color:#687586;background:#edf1f4}.admin-summary span:nth-child(2){color:var(--muted);font-size:12px}.admin-summary strong{font-size:21px}.lesson-loading{place-items:center;min-height:100vh;padding:24px;display:grid}.lesson-shell{width:100%;max-width:100vw;height:100dvh;min-height:0;color:var(--ink);background:#edf1f4;grid-template:58px minmax(0,1fr)/72px minmax(0,1fr);display:grid;overflow:hidden}.lesson-header{z-index:10;background:#fff;border-bottom:1px solid #d5dce3;grid-column:1/-1;align-items:center;gap:10px;min-width:0;padding:0 12px;display:flex}.lesson-header__title{flex:1;gap:2px;min-width:0;display:grid}.lesson-header__title strong,.lesson-header__title span{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.lesson-header__title strong{font-size:14px}.lesson-header__title span{color:var(--muted);font-size:11px}.connection-pill{color:#865207;background:#fff0d6;border-radius:99px;align-items:center;gap:6px;min-height:28px;padding:0 9px;font-size:11px;font-weight:700;display:inline-flex}.connection-pill--connected{color:#126044;background:#e5f5ef}.connection-pill--offline{color:#8d312d;background:#feecea}.lesson-timer{color:#4a5665;font-variant-numeric:tabular-nums;text-align:center;min-width:52px;font-size:13px;font-weight:750}.lesson-modes{background:#fff;border-right:1px solid #d5dce3;flex-direction:column;gap:7px;padding:10px 7px;display:flex}.lesson-modes button{color:#657283;cursor:pointer;background:0 0;border:0;border-radius:7px;flex-direction:column;justify-content:center;align-items:center;gap:4px;width:58px;height:58px;padding:5px 2px;display:flex}.lesson-modes button:hover{color:var(--ink);background:#edf2f6}.lesson-modes button.is-active{color:var(--blue);background:#e9f0ff}.lesson-modes span{font-size:9px;font-weight:700}.lesson-workspace{background:#f8fafc;min-width:0;min-height:0;position:relative;overflow:hidden}.workspace-pane{min-width:0;min-height:0;display:none;position:absolute;inset:0}.workspace-pane.is-visible{display:flex}.lesson-runtime-loading{grid-row:1/-1;place-items:center;width:100%;height:100%;display:grid}.lesson-toast{z-index:8;width:min(520px,100% - 24px);box-shadow:var(--shadow);align-items:center;display:flex;position:absolute;top:12px;left:50%;transform:translate(-50%)}.lesson-toast .notice{flex:1}.lesson-toast .icon-button{margin-left:-42px}.code-workspace{background:#fff;flex-direction:column;display:none}.code-workspace.is-visible{grid-template-rows:50px minmax(200px,1fr) minmax(120px,30%);display:grid}.code-toolbar{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:0 12px;display:flex}.language-switch{background:#edf1f5;border-radius:6px;height:34px;padding:3px;display:flex}.language-switch button{color:var(--control-text-muted);cursor:pointer;background:0 0;border:0;border-radius:4px;padding:0 11px;font-size:12px;font-weight:700}.language-switch button.is-active{color:var(--ink);box-shadow:none;background:#fff}.code-editor{min-width:0;min-height:0}.code-output{color:#dce7f1;background:#17212b;border-top:1px solid #2b3946;min-width:0;min-height:0;overflow:auto}.code-output__head{color:#9eafbd;text-transform:uppercase;border-bottom:1px solid #2b3946;justify-content:space-between;align-items:center;height:37px;padding:0 14px;font-size:11px;display:flex}.code-output__head button{color:#aebdca;cursor:pointer;text-transform:none;background:0 0;border:0;font-size:11px}.code-output pre{white-space:pre-wrap;margin:0;padding:12px 14px;font-family:Cascadia Code,Consolas,monospace;font-size:12px;line-height:1.55;overflow:auto}.lesson-library{background:#f5f7f9;flex-direction:column;padding:24px;overflow:auto}.lesson-library__header{justify-content:space-between;align-items:flex-start;gap:18px;margin-bottom:20px;display:flex}.lesson-library__header h2{margin:0 0 5px;font-size:20px}.lesson-library__header p{color:var(--muted);margin:0;font-size:12px}.lesson-library__header .search-field{background:#fff;flex:0 340px}.lesson-material-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px;display:grid}.lesson-material-card{border:1px solid var(--line);background:#fff;border-radius:7px;flex-direction:column;min-width:0;min-height:210px;padding:17px;display:flex}.lesson-material-card__head{justify-content:space-between;align-items:center;display:flex}.lesson-material-card__kind{width:34px;height:34px;color:var(--blue);background:#e7efff;border-radius:6px;place-items:center;display:grid}.lesson-material-card__kind--task{color:var(--amber);background:#fff1dc}.lesson-material-card h3{text-overflow:ellipsis;white-space:nowrap;margin:16px 0 7px;font-size:14px;overflow:hidden}.lesson-material-card p{color:#5a6675;-webkit-line-clamp:3;-webkit-box-orient:vertical;margin:0 0 16px;font-size:12px;line-height:1.5;display:-webkit-box;overflow:hidden}.lesson-material-card__foot{justify-content:space-between;align-items:center;gap:8px;margin-top:auto;display:flex}.lesson-material-card__foot>span{min-width:0;color:var(--muted);text-overflow:ellipsis;white-space:nowrap;font-size:10px;overflow:hidden}.progress-tag{color:#735019;white-space:nowrap;background:#fff0d6;border-radius:99px;align-items:center;min-height:21px;padding:3px 7px;font-size:9px;font-weight:750;display:inline-flex}.progress-tag--covered{color:#20508e;background:#e7f0ff}.progress-tag--completed{color:#126044;background:#e5f5ef}.guest-room__call,.call-room,.lesson-call{--call-shell-text:#24313d;--call-shell-muted:#5f7082;--call-shell-border:#d2dbe3;--call-shell-bg:#f4f7f9;--call-icon-text:#41576a;--call-icon-border:#c6d2dc;--call-icon-bg:#e6edf2;--call-error-text:#9b3430;--call-error-border:#e8b5b0;--call-error-bg:#fff0ef;--call-error-button:#a03b36;--call-primary-text:#fff;--call-primary-bg:#2563eb;--call-primary-hover:#1d4ed8;--call-stage-bg:#e9eef3;--call-participant-bg:#dce5eb;--call-placeholder-text:#566a7b;--call-placeholder-bg:#e3eaf0;--call-overlay-text:#263746;--call-overlay-bg:#f8fafcdb;--call-overlay-connecting:#8a5205;--call-pip-label:#fff;--call-pip-border:#2637464d;--call-pip-shadow:none;--call-pip-text-shadow:none;--call-connected:#16815a;--call-connected-ring:0 0 0 3px #16815a24;--call-speaking:#18a765;--call-speaking-ring:#18a76547;--call-quality-good:#248a62;--call-quality-warn:#ba791b;--call-quality-bad:#b83d38;--call-controls-bg:#f4f7f9e6;--call-control-text:#445668;--call-control-bg:#dbe4eb;--call-control-hover-text:#172532;--call-control-hover-bg:#c9d7e1;--call-control-active-text:#fff;--call-control-active-bg:#2f6b9a;--call-danger-text:#fff;--call-danger-bg:#b83d38;--call-danger-hover:#9e312d;--call-audio-border:#24313d38;--call-settings-bg:#fff;--call-settings-border:#c6d2dc;--call-settings-shadow:none;--call-settings-field-bg:#f4f7f9;--call-settings-field-border:#c6d2dc;--call-settings-focus:#2563eb;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}[data-theme=dark] .guest-room__call,[data-theme=dark] .call-room,[data-theme=dark] .lesson-call{--call-shell-text:#fff;--call-shell-muted:#b0b1ad;--call-shell-border:#363733;--call-shell-bg:#171816;--call-icon-text:#dedfdb;--call-icon-border:#4b4c47;--call-icon-bg:#282926;--call-error-text:#ffc8c2;--call-error-border:#784943;--call-error-bg:#3c2929;--call-error-button:#ffd1cb;--call-primary-text:#fff;--call-primary-bg:#2d68c4;--call-primary-hover:#2459a9;--call-stage-bg:#171816;--call-participant-bg:#20211f;--call-placeholder-text:#999b96;--call-placeholder-bg:#292a27;--call-overlay-text:#e8e9e6;--call-overlay-bg:#0d0e0cbd;--call-overlay-connecting:#ffe0a8;--call-pip-label:#fff;--call-pip-border:#ffffff57;--call-pip-shadow:none;--call-pip-text-shadow:none;--call-connected:#4ad49a;--call-connected-ring:0 0 0 3px #4ad49a24;--call-speaking:#3ddc84;--call-speaking-ring:#3ddc844d;--call-quality-good:#4ad49a;--call-quality-warn:#f0b75f;--call-quality-bad:#ff8178;--call-controls-bg:#0d0e0cdb;--call-control-text:#c1c2be;--call-control-bg:#30312e;--call-control-hover-text:#fff;--call-control-hover-bg:#41423e;--call-control-active-text:#fff;--call-control-active-bg:#46505d;--call-danger-text:#fff;--call-danger-bg:#b63c37;--call-danger-hover:#99312d;--call-audio-border:#ffffff40;--call-settings-bg:#242522;--call-settings-border:#4b4c47;--call-settings-shadow:none;--call-settings-field-bg:#30312e;--call-settings-field-border:#555650;--call-settings-focus:#76a9f5;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}.call-room{--lk-bg:var(--call-shell-bg);--lk-bg2:var(--call-participant-bg);--lk-bg3:var(--call-control-bg);--lk-fg:var(--call-shell-text);--lk-fg-secondary:var(--call-shell-muted);--lk-accent-bg:var(--call-primary-bg);--lk-accent-fg:var(--call-primary-text);--lk-danger:var(--call-danger-bg);--lk-border-color:var(--call-shell-border);color:var(--call-shell-text);background:var(--call-shell-bg)}.lesson-call{height:225px;color:var(--call-shell-text);background:var(--call-shell-bg);position:relative;overflow:hidden}.lesson-call--lobby{text-align:left;flex-direction:column;justify-content:center;align-items:stretch;padding:14px;display:flex}.call-lobby-summary{justify-content:center;align-items:center;gap:10px;display:flex}.call-lobby-copy{flex-direction:column;min-width:0;display:flex}.call-lobby-copy strong{font-size:14px}.call-lobby-copy span{color:var(--call-shell-muted);margin-top:3px;font-size:10px;line-height:1.35}.call-lobby-icon{border:1px solid var(--call-icon-border);width:44px;height:44px;color:var(--call-icon-text);background:var(--call-icon-bg);border-radius:50%;place-items:center;display:grid}.call-lobby-icon.is-error{color:var(--call-error-text);border-color:var(--call-error-border);background:var(--call-error-bg)}.call-lobby-roster{scrollbar-width:thin;width:min(320px,100%);min-height:31px;max-height:70px;margin:10px auto 0;overflow-y:auto}.call-lobby-roster__empty{min-height:31px;color:var(--call-shell-muted);text-align:center;place-items:center;font-size:10px;display:grid}.call-lobby-participant{border-radius:5px;grid-template-columns:24px minmax(0,1fr) auto;align-items:center;gap:7px;min-height:31px;padding:3px 5px;display:grid}.call-lobby-participant+.call-lobby-participant{border-top:1px solid var(--call-shell-border)}.call-lobby-participant__avatar{width:24px;height:24px;color:var(--call-primary-text);border-radius:50%;place-items:center;font-size:9px;font-weight:800;display:grid}.call-lobby-participant__name{text-overflow:ellipsis;white-space:nowrap;min-width:0;font-size:11px;font-weight:650;overflow:hidden}.call-lobby-participant__media{min-width:0;color:var(--call-shell-muted);justify-content:flex-end;align-items:center;gap:5px;display:inline-flex}.call-lobby-participant__media>span{place-items:center;width:18px;height:18px;display:grid}.call-lobby-error{width:min(290px,100%);color:var(--call-error-text);margin-top:8px;font-size:10px;line-height:1.3}.call-join-button{min-height:34px;color:var(--call-primary-text);background:var(--call-primary-bg);cursor:pointer;font:inherit;border:0;border-radius:6px;justify-content:center;align-items:center;gap:7px;margin:10px auto 0;padding:0 14px;font-size:11px;font-weight:750;display:inline-flex}.call-join-button:hover:not(:disabled){background:var(--call-primary-hover)}.call-join-button:disabled{cursor:wait;opacity:.72}.lesson-call--active{isolation:isolate}.call-stage{background:var(--call-stage-bg);padding:8px;position:absolute;inset:0 0 56px;overflow:hidden}.call-layout-grid{grid-template-columns:repeat(var(--lk-col-count,1), minmax(0, 1fr));grid-template-rows:repeat(var(--lk-row-count,1), minmax(0, 1fr));gap:7px;width:100%;min-width:0;height:100%;min-height:0;display:grid;position:relative}.call-layout-grid.is-media-empty{flex-wrap:wrap;place-content:center;align-items:center;display:flex}.call-layout-grid.is-media-empty .call-track-tile{flex:0 210px;width:min(210px,100%);height:min(124px,100%)}.call-track-tile{border:1px solid var(--call-shell-border);min-width:0;min-height:0;color:var(--call-shell-text);background:var(--call-participant-bg);cursor:default;border-radius:6px;position:relative;overflow:visible}.call-track-tile--media{cursor:pointer}.call-track-tile--media:hover{border-color:var(--call-settings-focus)}.call-track-tile--media:focus-visible{outline:2px solid var(--call-settings-focus);outline-offset:2px}.call-track-tile.is-focused{border-color:var(--call-settings-focus)}.call-layout-grid.has-active-media .call-track-tile--no-media{place-self:center;width:min(100%,220px);height:min(100%,140px)}.call-participant{border-radius:inherit;background:var(--call-participant-bg);inset:0;overflow:hidden;position:absolute!important}.call-participant video,.call-participant .lk-participant-media-video{object-fit:cover;width:100%;height:100%;display:block}.call-participant video[data-lk-local-participant=true][data-lk-source=camera]{transform:rotateY(180deg)}.call-participant .lk-participant-placeholder{color:var(--call-placeholder-text);background:var(--call-placeholder-bg);pointer-events:none;justify-content:center;align-items:center;display:none;position:absolute;inset:0}.call-participant[data-lk-video-muted=true] .lk-participant-placeholder{display:flex}.call-participant .lk-participant-placeholder svg{width:auto;height:82%;padding:9%}.call-track-tile--screen .call-participant video,.call-track-tile--screen .call-participant .lk-participant-media-video{object-fit:contain}.call-participant .lk-participant-metadata,.call-track-tile--no-media .call-participant{display:none}.call-participant-idle{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:5px;padding:10px;display:flex;position:absolute;inset:0}.call-participant-idle>span{border:1px solid var(--call-icon-border);width:42px;height:42px;color:var(--call-icon-text);background:var(--call-icon-bg);border-radius:50%;place-items:center;font-size:14px;font-weight:800;display:grid}.call-track-tile.is-transmitting-audio .call-participant-idle>span{border-color:var(--call-speaking);box-shadow:0 0 0 3px var(--call-speaking-ring)}.call-participant-idle strong{text-overflow:ellipsis;white-space:nowrap;max-width:100%;font-size:11px;overflow:hidden}.call-participant-idle small{color:var(--call-shell-muted);font-size:9px}.call-track-label{z-index:2;pointer-events:none;justify-content:space-between;align-items:center;gap:6px;display:flex;position:absolute;bottom:7px;left:34px;right:7px}.call-track-label>span,.call-track-label>small{min-width:0;color:var(--call-overlay-text);background:var(--call-overlay-bg);text-overflow:ellipsis;white-space:nowrap;border-radius:4px;padding:3px 6px;font-size:9px;font-weight:700;overflow:hidden}.call-track-label>span{max-width:100%}.call-track-tile--no-media .call-track-label{display:none}.call-connection{z-index:6;position:absolute;bottom:7px;left:7px}.call-connection__trigger{width:16px;height:16px;color:var(--call-shell-muted);cursor:default;opacity:.48;background:0 0;border:0;border-radius:50%;place-items:center;padding:0;transition:opacity .12s;display:grid}.call-connection:hover .call-connection__trigger,.call-connection:focus-within .call-connection__trigger{opacity:.82}.call-connection[data-quality=excellent] .call-connection__trigger,.call-connection[data-quality=good] .call-connection__trigger{color:var(--call-quality-good)}.call-connection[data-quality=poor] .call-connection__trigger{color:var(--call-quality-warn)}.call-connection[data-quality=lost] .call-connection__trigger{color:var(--call-quality-bad)}.call-connection__trigger:focus-visible{outline:2px solid var(--call-settings-focus);outline-offset:2px}.call-connection__popover{border:1px solid var(--call-settings-border);width:188px;color:var(--call-shell-text);background:var(--call-settings-bg);box-shadow:var(--call-settings-shadow);border-radius:6px;padding:9px 10px;position:absolute;bottom:21px;left:0}.call-connection__popover>strong{margin-bottom:5px;font-size:10px;display:block}.call-connection__popover dl{gap:3px;margin:0;display:grid}.call-connection__popover dl>div{justify-content:space-between;gap:8px;min-width:0;font-size:9px;display:flex}.call-connection__popover dt{color:var(--call-shell-muted)}.call-connection__popover dd{text-overflow:ellipsis;white-space:nowrap;margin:0;font-weight:700;overflow:hidden}.call-participant-menu{z-index:10;border:1px solid var(--call-settings-border);width:min(248px,100% - 16px);color:var(--call-shell-text);background:var(--call-settings-bg);box-shadow:var(--call-settings-shadow);border-radius:7px;padding:11px;position:absolute}.call-participant-volume{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:9px 10px;min-width:0;display:grid}.call-participant-volume>label{color:var(--call-shell-muted);font-size:10px;font-weight:700}.call-participant-volume__value{border:1px solid var(--call-settings-field-border);background:var(--call-settings-field-bg);border-radius:5px;grid-template-columns:minmax(0,1fr) auto;align-items:center;width:70px;height:30px;padding:0 7px;display:grid}.call-participant-volume__value:focus-within{border-color:var(--call-settings-focus);outline:2px solid color-mix(in srgb, var(--call-settings-focus) 22%, transparent);outline-offset:1px}.call-participant-volume__value input{width:100%;min-width:0;color:var(--call-shell-text);font:inherit;text-align:right;background:0 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