:root{--bg:#f9fafb;--panel:#fff;--panel-alt:#f9fafb;--line:#e5e7eb;--ink:#111827;--muted:#6b7280;--accent:#3b82f6}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Trebuchet MS,Verdana,sans-serif}.shell{max-width:1200px;margin:0 auto;padding:28px 20px 60px;display:grid;grid-gap:20px;gap:20px}.appFrame{min-height:100vh}.dashboardShell{grid-template-columns:280px minmax(0,1fr)}.dashboardShell,.sideRail{min-height:100vh;display:grid}.sideRail{padding:28px 20px 24px;border-right:1px solid var(--line);background:#fff;align-content:start;grid-gap:20px;gap:20px;position:-webkit-sticky;position:sticky;top:0}.brandBlock,.railCard{display:grid;grid-gap:8px;gap:8px}.sideRailTitle{margin:0;font-size:2rem}.sideNav{display:grid;grid-gap:10px;gap:10px}.workspace{min-width:0}.topbar{padding:28px 28px 10px;display:flex;justify-content:space-between;gap:16px;align-items:center}.topbarTitle{margin:4px 0 0;font-size:2rem}.topbarMeta{display:flex;gap:14px;align-items:center}.mobileMenuBar{display:none;padding:0 28px 16px;gap:10px;flex-wrap:wrap}.menuItem{padding:10px 14px;border-radius:999px;text-decoration:none;color:var(--ink);border:1px solid var(--line);background:#fff}.menuItem.active{background:var(--accent);color:#fff;border-color:var(--accent)}.roleBadge{display:inline-flex;width:-moz-fit-content;width:fit-content;padding:7px 12px;border-radius:999px;background:#eff6ff;color:var(--accent);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.08em}.grid{grid-gap:16px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.grid,.stack{display:grid;gap:16px}.stack{grid-gap:16px}.panel{background:linear-gradient(180deg,var(--panel),var(--panel-alt));border:1px solid var(--line);border-radius:22px;padding:24px}.panel h1,.panel h3,.panel p{margin-top:0}.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-size:12px;color:var(--accent)}.cta{display:inline-flex;width:-moz-fit-content;width:fit-content;padding:12px 16px;border-radius:999px;background:var(--accent);color:#fff;font-weight:700;text-decoration:none;border:none;cursor:pointer}.ghostButton{padding:10px 14px;border-radius:999px;border:1px solid var(--line);background:var(--panel);color:var(--ink);cursor:pointer}.buttonRow{display:flex;gap:12px;flex-wrap:wrap}.muted{color:var(--muted)}.linkButton{text-decoration:none}.classroomPage{--accent:#f59e0b;height:100vh;padding:0;background:var(--bg);overflow:hidden;display:flex;flex-direction:column}.classroomEmptyState{max-width:720px;margin:10vh auto 0;padding:32px;border:1px solid var(--line);border-radius:28px;background:#fff}.classroomLayout{display:flex;flex-direction:column;flex:1 1;min-height:0}.classroomToolbar{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:14px;padding:16px 20px}.classroomStatusRow{display:grid;grid-gap:8px;gap:8px;justify-items:end}.statusBadge{display:inline-flex;width:-moz-fit-content;width:fit-content;padding:8px 14px;border-radius:999px;background:#eff6ff;color:var(--accent);font-weight:700}.classroomMain{height:calc(100vh - 40px);overflow:hidden;padding:14px}.mainSurface{position:relative;height:100%;display:grid;grid-template-rows:minmax(0,1fr) auto;grid-gap:10px;gap:10px}.boardStageScrollable{overflow-y:auto;overflow-x:hidden}.boardStageExcalidraw,.boardStageScrollable{position:relative;height:calc(100vh - 132px);border-radius:18px;border:1px solid var(--line);background:#fff}.boardStageExcalidraw{overflow:hidden}.boardSurfaceCanvas{position:relative;width:100%;min-height:1800px}.boardPdfLayer{border:none}.boardImageLayer,.boardPdfLayer{position:absolute;inset:0;width:100%;height:100%;background:#fff;pointer-events:none;z-index:1}.boardImageLayer{object-fit:contain;object-position:top center}.boardBlankLayer{position:absolute;inset:0;display:grid;place-items:center;color:var(--muted);background:#f9fafb}.boardFooter{display:grid;grid-gap:10px;gap:10px}.boardFooterSingleRow{display:flex;flex-wrap:nowrap;align-items:center;gap:8px;overflow-x:auto;margin-top:0;padding:4px 0 2px}.controlsPageText{white-space:nowrap;font-size:.88rem}.controlSmall{padding:7px 11px;font-size:.84rem}.boardTabs{display:flex;gap:10px;flex-wrap:wrap}.videoTile{min-height:240px;border-radius:22px;overflow:hidden;border:1px solid var(--line);background:#f3f4f6;display:grid;grid-template-rows:minmax(0,1fr) auto}.videoTileLarge{min-height:520px}.videoTileHero{min-height:calc(100vh - 220px)}.videoTileCompact{min-height:132px}.remoteWaitingChip{border-radius:999px;border:1px solid var(--line);background:#f3f4f6;color:var(--muted);font-size:.86rem;font-weight:600;padding:8px 12px;text-align:center}.videoTilePlaceholder{place-items:center}.videoMount{min-height:100%;width:100%;background:#111827}.videoMount video{width:100%;height:100%;object-fit:cover}.videoCaption{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:14px 16px;background:#fff;color:var(--ink)}.videoCaption span{color:var(--muted);font-size:.95rem}.videoEmpty{display:grid;grid-gap:8px;gap:8px;text-align:center;color:var(--muted);padding:24px}.panelHeader{margin-bottom:16px}.panelHeader,.pdfControls{display:flex;justify-content:space-between;gap:12px;align-items:center}.pdfControls{margin-bottom:14px}.pdfFrame{width:100%;height:620px;border:1px solid var(--line);border-radius:18px;background:#fff}.pdfRail{min-height:calc(100vh - 140px);position:-webkit-sticky;position:sticky;top:20px;min-width:280px}.pdfFrameRail{height:calc(100vh - 260px)}.whiteboardCanvas{width:100%;min-height:620px;border-radius:18px;border:1px solid var(--line);background:#fff;touch-action:none;cursor:crosshair}.whiteboardCanvasLarge{min-height:100%;height:100%}.whiteboardCanvasTall{min-height:1800px;height:1800px}.whiteboardCanvasOverlay{position:absolute;inset:0;border:none;background:transparent;z-index:3;pointer-events:auto;-webkit-user-select:none;-moz-user-select:none;user-select:none}.whiteboardVectorOverlay{position:absolute;inset:0;width:100%;height:100%;z-index:2;pointer-events:none}.classroomVideoRail{height:calc(100vh - 40px);display:grid;grid-template-rows:auto minmax(0,1fr);grid-gap:12px;gap:12px;padding:14px}.videoRailStack{grid-gap:10px;gap:10px}.chatFeed,.videoRailStack{display:grid;align-content:start;overflow-y:auto}.chatFeed{min-height:0;grid-gap:12px;gap:12px}.chatBubble{display:grid;grid-gap:6px;gap:6px;padding:14px;border-radius:18px;background:#f3f4f6;border:1px solid var(--line)}.chatBubble span{color:var(--muted)}.chatComposer{display:grid;grid-gap:12px;gap:12px;margin-top:16px}.floatingVideoStack{position:absolute;width:236px;display:grid;grid-gap:10px;gap:10px;z-index:5}.overlayDragHandle{width:100%;padding:8px 10px;border-radius:12px;border:1px dashed var(--line);background:#fff;color:var(--muted);font-weight:600;font-size:.9rem;cursor:-webkit-grab;cursor:grab}.overlayDragHandle:active{cursor:-webkit-grabbing;cursor:grabbing}.videoStageSolo{display:grid;grid-gap:16px;gap:16px;height:100%}.videoStageBottom{display:grid;grid-template-columns:repeat(2,minmax(0,240px));grid-gap:16px;gap:16px;align-content:start}.videoMountRemote{display:none}.chatToggleFab{position:fixed;right:20px;bottom:20px;z-index:30;padding:14px 18px;border-radius:999px;border:1px solid var(--line);background:var(--accent);color:#fff;font-weight:700;cursor:pointer}.pdfResizeHandle{position:absolute;top:22px;left:-10px;width:20px;height:calc(100% - 44px);border:none;background:transparent;cursor:col-resize}.pdfResizeHandle:before{content:"";position:absolute;top:0;bottom:0;left:9px;width:2px;border-radius:999px;background:var(--line)}.chatDrawer{position:fixed;top:0;right:0;width:min(420px,100vw);height:100vh;padding:20px 20px 20px 0;transform:translateX(100%);transition:transform .18s ease;z-index:40;pointer-events:none}.chatDrawer.open{transform:translateX(0);pointer-events:auto}.chatDrawerInner{height:100%;display:grid;grid-template-rows:auto minmax(0,1fr) auto;box-shadow:-24px 0 60px rgba(0,0,0,.08)}.classroomError{margin:0;color:#dc2626}.calendarHeader{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}.calendarWeekLabel{font-size:1.1rem;font-weight:700;color:var(--ink)}.calendarLegend{display:flex;gap:16px;flex-wrap:wrap}.legendItem{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:.95rem}.legendSwatch{width:12px;height:12px;border-radius:999px;display:inline-block}.legendSwatch.available{background:#22c55e}.legendSwatch.booked{background:#f59e0b}.legendSwatch.completed{background:#94a3b8}.weekGrid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));grid-gap:14px;gap:14px}.dayColumn{display:grid;grid-gap:12px;gap:12px;min-width:0}.dayHeader{padding:14px;border-radius:18px;border:1px solid var(--line);background:#fff}.slotList{display:grid;grid-gap:10px;gap:10px}.slotCard{display:grid;grid-gap:12px;gap:12px;padding:14px;border-radius:18px;border:1px solid var(--line);background:#fff}.slotCard.available{border-color:rgba(34,197,94,.45);background:rgba(34,197,94,.12)}.slotCard.booked{border-color:rgba(245,158,11,.5);background:rgba(245,158,11,.14)}.slotCard.completed{border-color:rgba(148,163,184,.45);background:rgba(148,163,184,.14)}.slotCard.past{border-color:rgba(148,163,184,.4);background:rgba(148,163,184,.12)}.slotCard.empty{min-height:96px;align-content:center}.slotMeta{display:grid;grid-gap:6px;gap:6px}.slotBadge{display:inline-flex;width:-moz-fit-content;width:fit-content;padding:8px 12px;border-radius:999px;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.slotBadge.booked{background:#fef3c7;color:#92400e}.slotBadge.completed,.slotBadge.past{background:#f1f5f9;color:#64748b}.slotAction{width:100%;min-height:42px;border-radius:12px;border:1px solid var(--line);font-weight:700;cursor:pointer}.slotAction.empty{background:#fff;color:#0f172a}.slotAction.available{background:#22c55e;color:#052e16;border-color:#22c55e}.slotAction.booked{background:#f59e0b;color:#1f1403;border-color:#f59e0b}.slotAction.completed,.slotAction.past{background:#94a3b8;color:#0f172a;border-color:#94a3b8}.tableWrap{overflow-x:auto;border:1px solid var(--line);border-radius:18px}.tutorTable{width:100%;border-collapse:collapse}.tutorTable td,.tutorTable th{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.tutorTable th{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);background:#f9fafb}.paginationRow{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-top:18px}.loginShell{min-height:100vh;display:grid;place-items:center;padding:24px}.loginCard{width:min(460px,100%);display:grid;grid-gap:14px;gap:14px;border:1px solid var(--line);border-radius:24px;background:#fff;padding:28px;box-shadow:0 24px 60px rgba(0,0,0,.06)}.input{border-radius:14px;padding:12px 14px;border:1px solid var(--line);font:inherit;background:#fff;color:var(--ink)}.errorText{color:#dc2626}@media (max-width:960px){.dashboardShell{grid-template-columns:1fr}.sideRail{min-height:auto;position:static;border-right:none;border-bottom:1px solid var(--line)}.sideNav{display:none}.mobileMenuBar{display:flex}.shell{padding-top:16px}.calendarHeader,.weekGrid{grid-template-columns:1fr;display:grid}.paginationRow{display:grid}.classroomToolbar,.videoStageBottom{grid-template-columns:1fr;display:grid}.classroomVideoRail{height:auto}.boardStageScrollable{height:360px}.pdfRail{position:static;min-height:auto}.pdfFrame,.pdfFrameRail,.videoTileHero,.whiteboardCanvas,.whiteboardCanvasLarge{min-height:360px;height:360px}.panelHeader,.pdfControls{flex-direction:column;align-items:flex-start}.classroomStatusRow{justify-items:start}.floatingVideoStack{position:static;width:100%;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));margin-top:16px}.boardFooterSingleRow{flex-wrap:wrap}.pdfResizeHandle{display:none}.chatDrawer{width:100vw;padding:12px 0 0}}