/* The teaching workspace follows MainView.swift's four-panel geometry. */
body.native-teaching{--n-bg:#ececec;--n-panel:#f5f5f5;--n-side:#e8e8e8;--n-text:#202020;--n-muted:#737373;--n-line:#c8c8c8;--n-control:#fff;--n-accent:#087cfa;--n-selected:#d6e6fc;background:var(--n-bg);color:var(--n-text);font:13px -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;overflow:hidden}
.native-top{height:30px;display:flex;justify-content:space-between;align-items:center;padding:0 12px;background:var(--n-bg);border-bottom:1px solid var(--n-line);font-size:12px;color:var(--n-text)}.native-top strong{font-weight:600}.native-top .native-switch{display:flex;align-items:center;gap:12px;font-size:10px;color:var(--n-muted)}.native-top button{padding:2px 7px;font-size:10px;min-height:20px}
.native-teaching button,.native-teaching select,.native-teaching input{font-family:inherit;color:var(--n-text)}.native-teaching button{border:1px solid var(--n-line);border-radius:5px;background:linear-gradient(var(--n-control),var(--n-panel));padding:4px 9px;font-size:12px;box-shadow:0 1px 1px #00000009;min-height:25px;font-weight:400}.native-teaching button:hover{filter:brightness(.97)}.native-teaching button:disabled{opacity:.4}.native-teaching button.blue{background:var(--n-accent);border-color:var(--n-accent);color:white}.native-teaching select,.native-teaching input[type=number],.native-teaching input[type=text],.native-teaching input[type=date],.native-teaching input[type=time]{background:var(--n-control);border:1px solid var(--n-line);border-radius:5px;padding:4px 6px;min-height:25px;font-size:12px}.native-teaching input[type=number]{width:61px}.native-teaching textarea{font:13px -apple-system,BlinkMacSystemFont,sans-serif}.native-teaching .muted{color:var(--n-muted);font-size:11px}.native-teaching label{font-size:12px;margin:0}.native-workspace{display:grid;grid-template-columns:clamp(150px,14vw,210px) minmax(250px,1fr) minmax(300px,26vw) clamp(150px,13vw,210px);height:calc(100dvh - 30px);width:100%;min-width:900px;overflow:hidden}.native-classes{display:flex;flex-direction:column;background:var(--n-side);border-right:1px solid var(--n-line);min-height:0}.native-class-head{display:flex;justify-content:space-between;align-items:center;padding:8px 15px;font-size:14px;font-weight:600}.native-sidebar-tools{display:flex;gap:8px;padding:0 15px 7px}.native-sidebar-tools button{min-width:28px;padding:3px 7px}.native-class-list{overflow:auto;flex:1;padding:4px 8px 15px}.native-class-row{display:block!important;width:100%;text-align:left;background:transparent!important;border:0!important;box-shadow:none!important;border-radius:5px!important;padding:9px 8px!important;margin:2px 0;min-height:50px!important}.native-class-row strong{display:block;font-size:14px;font-weight:500;margin-bottom:4px}.native-class-row small{font-size:11px;line-height:1.4;color:var(--n-muted);display:block}.native-class-row.selected{background:var(--n-accent)!important;color:white}.native-class-row.selected small{color:#ffffffd9}.native-pdf-column{display:flex;flex-direction:column;min-width:0;min-height:0;border-right:1px solid var(--n-line)}.native-datebar{display:flex;align-items:center;gap:10px;padding:8px 16px;border-bottom:1px solid var(--n-line);background:var(--n-bg);min-height:87px}.native-date-class{min-width:75px;margin-right:auto;overflow:hidden}.native-date-class strong{font-size:14px;display:block;white-space:nowrap}.native-date-class small{font-size:11px;color:var(--n-muted);display:block;margin-top:5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.native-date-card{background:color-mix(in srgb,var(--n-accent) 12%,transparent);border-radius:8px;padding:6px 10px;text-align:center;min-width:140px}.native-date-card small{display:block;font-size:9px;color:var(--n-muted);letter-spacing:.3px}.native-date-card strong{font-size:13px;display:block;margin:3px 0}.native-date-card .adjusted{font-size:11px;color:#bb7626;display:block}.native-date-card .today{font-size:11px;color:#338957}.native-date-card input{width:18px;padding:0!important;border:0!important;min-height:15px!important;font-size:0!important;background:none!important}.native-date-card input::-webkit-datetime-edit{display:none}.native-toolbar{padding:6px 10px;background:var(--n-bg);border-bottom:1px solid var(--n-line);flex-shrink:0}.native-control-row{display:flex;align-items:center;gap:8px;overflow-x:auto;scrollbar-width:thin;white-space:nowrap;padding-bottom:3px}.native-arrow{min-width:36px;height:36px;font-size:21px!important}.native-statuscard{background:var(--n-control);border:1px solid var(--n-line);padding:4px 9px;border-radius:6px;min-width:76px;text-align:center}.native-statuscard small{font-size:9px;display:block;color:var(--n-muted)}.native-statuscard strong{font-size:16px;line-height:1.2;font-weight:600;display:block}.native-statuscard span{display:block;font-size:9px;color:var(--n-muted)}.native-separator{height:34px;min-width:1px;background:var(--n-line);margin:0 4px}.native-bookselect{min-width:145px;max-width:180px}.native-new-actions{display:flex;align-items:center;gap:6px;overflow-x:auto;margin-top:5px;white-space:nowrap}.native-new-actions button{font-size:10px;min-height:23px}.native-new-actions small{font-size:9px;color:var(--n-muted);margin-left:auto}.native-pdf-scroll{flex:1;overflow:auto;background:#a4a4a4;outline:none;position:relative;min-height:0;padding:8px}.native-page-spread{display:flex;gap:6px;align-items:start;justify-content:center;min-height:100%}.native-pdf-page{position:relative;min-width:0;background:white;box-shadow:0 1px 5px #0003;flex-shrink:0}.native-pdf-page>img{width:100%;display:block;user-select:none}.native-pdf-page iframe{width:100%;height:100%;min-height:650px;border:0}.native-pdf-empty{color:#5e5e5e;background:var(--n-panel);height:100%;display:grid;place-content:center;text-align:center;gap:10px}.native-pdf-empty span{font-size:40px;color:#858585}.native-footer{display:flex;justify-content:space-between;align-items:center;background:var(--n-bg);border-top:1px solid var(--n-line);padding:3px 9px;font-size:10px;color:var(--n-muted);min-height:25px}.native-footer input{width:90px;margin:0}.native-media-column{display:grid;grid-template-rows:minmax(0,1fr) minmax(310px,40%);min-height:0;border-right:1px solid var(--n-line);background:var(--n-panel)}.native-media-panel{display:flex;flex-direction:column;min-height:0;overflow:hidden;outline:none}.native-media-panel+.native-media-panel{border-top:1px solid var(--n-line)}.native-pane-head{font-size:13px;font-weight:600;background:var(--n-bg);border-bottom:1px solid var(--n-line);padding:8px 12px;min-height:33px;display:flex;justify-content:space-between;align-items:center;gap:8px}.native-pane-head.video{font-size:12px}.native-files{flex:1;overflow:auto;min-height:40px;padding:4px 5px}.native-media-panel.has-selection .native-files{flex:0 0 56px;max-height:56px}.native-file-row{display:flex!important;align-items:start;gap:7px;width:100%;border:0!important;background:none!important;box-shadow:none!important;text-align:left;padding:6px 8px!important;border-radius:4px!important;min-height:29px!important;font-size:12px!important;line-height:1.4}.native-file-row.selected{background:var(--n-selected)!important}.native-file-row span:first-child{color:#8b8b8b;font-size:11px;margin-top:1px}.native-file-row.selected span:first-child{color:var(--n-accent)}.native-file-row span:last-child{overflow-wrap:anywhere;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.native-player{border-top:1px solid var(--n-line);padding:8px 10px;flex-shrink:0}.native-player-filename{border:0!important;background:none!important;box-shadow:none!important;display:block;width:100%;font-size:12px!important;text-align:center;padding:0 8px!important;color:var(--n-muted)!important;overflow:hidden;max-height:35px;min-height:18px!important;overflow-wrap:anywhere}.native-scrub{width:100%;height:20px;accent-color:var(--n-accent);margin:5px 0 0}.native-timebar{display:flex;justify-content:space-between;font-size:10px;font-variant-numeric:tabular-nums;color:var(--n-muted);padding:0 3px}.native-playback-buttons{display:flex;justify-content:center;align-items:center;gap:6px;margin:7px 0}.native-playback-buttons button{width:46px;height:46px;background:var(--n-bg);border:0;box-shadow:none;font-size:18px;border-radius:10px;padding:3px}.native-playback-buttons .native-play{font-size:32px;color:var(--n-accent);width:56px;height:56px}.native-speed-row{display:flex;justify-content:center;align-items:center;gap:8px}.native-speed-row button{height:30px;min-width:30px;border:0;box-shadow:none;background:var(--n-bg);font-size:18px;padding:3px}.native-speed-row select{font-size:11px;min-height:25px}.native-speed-row .mute{font-size:15px}.native-media-mark{display:flex;gap:6px;justify-content:center;margin-top:8px}.native-media-mark button{font-size:9px;min-height:23px;padding:4px 7px}.native-media-mark .selected{outline:1px solid var(--n-accent)}.native-video-preview{flex:1;min-height:50px;position:relative;overflow:hidden;background:#000;display:grid;place-items:center}.native-video-preview video{display:block;width:100%;height:100%;max-height:100%;object-fit:contain;margin:0;border-radius:0;cursor:pointer}.native-video-tools{display:flex;gap:6px;justify-content:end;padding:4px 9px;border-bottom:1px solid var(--n-line);font-size:10px}.native-video-tools button{font-size:10px;min-height:21px}.native-notes-column{display:grid;grid-template-rows:minmax(200px,1fr) minmax(200px,1fr);min-height:0;background:var(--n-control)}.native-note-pane{display:flex;flex-direction:column;min-height:0;resize:vertical;overflow:hidden}.native-note-pane+.native-note-pane{border-top:1px solid var(--n-line)}.native-note-pane textarea{border:0;resize:none;outline:none;min-height:0;flex:1;background:var(--n-control);color:var(--n-text);padding:9px;line-height:1.5;font-size:13px;border-radius:0}.native-note-pane .native-pane-head{font-size:14px;padding:12px 16px 8px;background:var(--n-control);border:0}.native-save-status{font-size:9px;color:var(--n-muted);padding:3px 8px;min-height:18px}.native-teaching dialog{background:var(--n-panel);color:var(--n-text);font-size:13px;max-height:85vh;overflow:auto}.native-teaching dialog h2{font-size:16px;margin-bottom:15px}.native-teaching dialog label{display:block;margin:13px 0 6px}.native-teaching dialog input:not([type=checkbox]),.native-teaching dialog select{width:100%}.native-teaching dialog .native-inline{display:flex;align-items:center;gap:8px}.native-teaching dialog .native-inline input{width:auto!important}.native-teaching dialog textarea{width:100%;min-height:80px}.native-teaching dialog .modalfoot{margin-top:19px}.native-popup-menu{position:fixed;z-index:35;background:var(--n-panel);border:1px solid var(--n-line);box-shadow:0 5px 20px #0003;padding:5px;border-radius:7px;min-width:150px}.native-popup-menu button{display:block;width:100%;text-align:left;border:0;box-shadow:none;background:none}.native-textbox{position:absolute;min-width:40px;min-height:30px;resize:both;overflow:auto;padding:7px;border:1px dashed #777;background:#fffff033;color:#111}.native-textbox.selected{outline:2px solid #1282ff}.native-text-drag{height:10px;background:#4684cd44;cursor:move;position:absolute;left:0;top:0;right:0}.native-text-content{outline:none;width:100%;height:100%;padding-top:7px;white-space:pre-wrap}.native-textbox-tools{display:flex;gap:6px;align-items:center}.native-fullscreen{position:fixed!important;inset:0!important;background:var(--n-bg);z-index:100;height:100vh!important;width:100vw!important;border:0!important}.native-media-panel.native-fullscreen .native-files{display:none}.native-media-panel.native-fullscreen .native-video-preview{order:-1}.native-media-panel.native-fullscreen .native-player{max-width:950px;width:100%;margin:0 auto}.native-empty-media{display:grid;place-items:center;flex:1;color:var(--n-muted);font-size:11px}.native-audio-element{display:none!important}.native-import-status{font-size:11px;color:var(--n-muted);padding:8px}.native-teaching #toast{background:#3a3a3a;font-size:12px}.native-debug-info{font-size:10px;color:var(--n-muted);line-height:1.7}.native-fieldset{border:1px solid var(--n-line);border-radius:6px;margin:12px 0;padding:12px}.native-fieldset legend{font-weight:600;font-size:12px}.native-calendar-days{display:grid;grid-template-columns:repeat(7,1fr);gap:3px}.native-calendar-days label{font-size:11px;text-align:center}.native-teaching .native-class-row:focus-visible,.native-teaching .native-file-row:focus-visible{outline:2px solid var(--n-accent)}
@media(prefers-color-scheme:dark){body.native-teaching{--n-bg:#282828;--n-panel:#202020;--n-side:#262626;--n-text:#eee;--n-muted:#a4a4a4;--n-line:#424242;--n-control:#333;--n-selected:#1e4065}.native-teaching button{box-shadow:0 1px 1px #0003}.native-pdf-scroll{background:#484848}}
.native-media-column{grid-template-rows:minmax(0,1fr) clamp(310px,40vh,330px)}.native-control-row{scrollbar-width:none}.native-control-row::-webkit-scrollbar{display:none}
.native-student-grid{display:grid;grid-template-columns:1fr 1fr;gap:5px;margin-top:10px}.native-student-choice{display:flex!important;align-items:center;gap:7px;border:1px solid var(--n-line);border-radius:5px;padding:8px!important;margin:0!important;background:var(--n-control);font-size:12px!important;cursor:pointer;min-height:39px}.native-student-choice:has(input:checked){background:var(--n-selected);border-color:var(--n-accent)}.native-student-choice input{width:auto!important;min-height:0!important;accent-color:var(--n-accent);margin:0}.native-student-choice span{overflow-wrap:anywhere;min-width:0}.native-student-choice small{display:block;font-size:9px;color:var(--n-muted);margin-top:3px}.native-student-choice[hidden]{display:none!important}.native-roster-actions{display:flex;gap:7px;align-items:center;flex-wrap:wrap;margin:10px 0}.native-roster-actions button{font-size:10px}.native-roster-actions span{font-size:11px;color:var(--n-muted);margin-left:auto}
.native-notes-column{grid-template-rows:minmax(200px,1fr) 4px minmax(200px,1fr)}.native-note-pane{resize:none}.native-notes-divider{height:4px;background:var(--n-line);cursor:row-resize}.native-notes-divider:hover{background:var(--n-accent)}.native-exit-fullscreen{display:none;position:absolute;top:10px;right:12px;z-index:110;min-width:32px;min-height:32px}.native-fullscreen>.native-exit-fullscreen{display:block}

/* Classroom browsing must stay usable while either player is open. */
.native-media-column{grid-template-rows:minmax(390px,1.12fr) minmax(310px,1fr);overflow-y:auto}
.native-media-panel{overflow:auto}
.native-media-panel .native-files,.native-media-panel.has-selection .native-files{flex:1 1 auto;min-height:150px;max-height:none;scrollbar-gutter:stable;overscroll-behavior:contain}
.native-file-row{min-height:39px!important;padding:9px 8px!important;font-size:13px!important;align-items:center;border-bottom:1px solid var(--n-line)!important;border-radius:0!important}
.native-file-row.selected{box-shadow:inset 4px 0 var(--n-accent)!important;font-weight:650}
.native-file-row span:first-child{font-size:13px;flex-shrink:0}
.native-file-row span:last-child{-webkit-line-clamp:2}
.native-player{padding:5px 8px}
.native-player-filename{text-align:left;font-weight:600!important;font-size:11px!important;max-height:30px}
.native-playback-buttons{gap:3px;margin:3px 0}
.native-playback-buttons button{width:32px;height:32px;font-size:14px;border-radius:6px}
.native-playback-buttons .native-play{width:40px;height:38px;font-size:26px}
.native-playback-buttons .native-track-step{color:var(--n-text);background:var(--n-selected);font-size:19px;width:34px}
.native-scrub{height:14px;margin-top:2px}.native-timebar{font-size:10px}
.native-speed-row{gap:5px}.native-speed-row button{height:25px;min-height:25px;font-size:15px}
.native-media-mark{margin-top:4px}.native-media-mark button{font-size:11px;min-height:27px}
.native-video-preview{flex:0 1 130px;height:130px;min-height:80px}
.native-video-tools{padding:2px 8px}
.native-teaching .native-datebar{background:#eef5ff;color:#172e4d}
.native-date-class strong{font-size:16px;color:#172e4d}.native-date-class small{color:#455b75;font-size:12px}
.native-date-card{background:#dceaff;border:1px solid #b6cbe8;color:#172e4d}
.native-date-card small{color:#405774;font-size:10px}.native-date-card strong{color:#172e4d;font-size:14px}
.native-date-card .adjusted{color:#825213}.native-date-card .today{color:#205e3c}
.native-teaching .native-new-actions{background:#edf7f0;padding:5px;flex-wrap:wrap;white-space:normal}
.native-new-actions small{color:#3e5d4c}.native-new-actions button{font-size:12px;min-height:32px}
.native-teaching .class-mark{background:#d7eddf;color:#17492f;border-color:#a4cbb3}
.native-teaching .homework-mark{background:#fff0cb;color:#684611;border-color:#d9be80}
.native-teaching .native-new-actions>button:not(.class-mark):not(.homework-mark){background:#fff;color:#243f33;border-color:#a9bfb1}
.native-teaching .lesson-tools button{color:#244334}.native-teaching .lesson-tools .lesson-recordings-button{color:#244334}
.native-media-panel.native-fullscreen .native-video-preview{flex:1;height:auto;max-height:none!important;min-height:0}
@media(max-height:800px){.native-media-column{grid-template-rows:minmax(420px,1.1fr) minmax(325px,1fr)}.native-media-panel .native-files,.native-media-panel.has-selection .native-files{min-height:132px}.native-video-preview{flex-basis:90px;height:90px}}