.instructor-lab-shell {
    display: block;
    min-height: calc(100vh - 184px);
}

.lab-sidebar-section {
    display: grid;
    gap: 10px;
    min-height: 0;
}

.lab-sidebar-group-title {
    display: grid;
    gap: 4px;
    justify-items: center;
    text-align: center;
}

.lab-sidebar-group-title strong {
    font-size: 0.84rem;
    line-height: 1.3;
}

.lab-sidebar-separator {
    height: 1px;
    background: var(--line);
    margin: 2px 0;
}

.lab-sidebar-mode {
    display: grid;
    justify-items: center;
    gap: 8px;
    padding: 10px 8px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--text);
    text-align: center;
    font-size: 0.76rem;
    line-height: 1.3;
}

.lab-sidebar-mode svg {
    color: var(--brand);
}

.lab-sidebar-mode.selected {
    background: var(--brand-soft);
    border-color: rgba(0, 120, 212, 0.35);
}

.lab-section-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.lab-section-title {
    font-size: 0.84rem;
    font-weight: 700;
    color: var(--text);
}

.lab-section-meta {
    font-size: 0.76rem;
    color: var(--muted);
}

.lab-vm-icon-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.lab-vm-icon {
    display: grid;
    gap: 8px;
    justify-items: center;
    padding: 10px 8px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--text);
    text-align: center;
}

.lab-vm-icon:hover,
.lab-student-vm-tile:hover {
    background: var(--bg-hover);
    border-color: var(--line-strong);
}

.lab-vm-icon.selected,
.lab-student-vm-tile.selected {
    background: var(--brand-soft);
    border-color: rgba(0, 120, 212, 0.35);
}

.lab-vm-icon-glyph,
.lab-student-vm-top svg {
    color: var(--brand);
}

.lab-vm-icon-label {
    font-size: 0.72rem;
    line-height: 1.3;
    overflow-wrap: anywhere;
}

.lab-student-groups {
    display: grid;
    gap: 12px;
    overflow: auto;
    padding-right: 4px;
}

.lab-student-group {
    display: grid;
    gap: 10px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: #fff;
}

.lab-student-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 10px;
}

.lab-student-head strong {
    font-size: 0.86rem;
}

.lab-student-head.compact {
    align-items: flex-start;
}

.lab-student-head span {
    font-size: 0.76rem;
    color: var(--muted);
}

.lab-student-vm-grid {
    display: grid;
    gap: 8px;
}

.lab-student-vm-tile {
    display: grid;
    gap: 6px;
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--bg-shell);
    color: var(--text);
    text-align: left;
}

.lab-student-vm-top {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
}

.lab-vm-chip-row {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
    width: 100%;
    margin-left: auto;
    justify-content: flex-end;
}

.lab-student-vm-tile strong {
    font-size: 0.82rem;
}

.instructor-lab-main {
    display: grid;
    grid-template-rows: minmax(0, 1fr);
    min-width: 0;
    min-height: 100vh;
    height: 100%;
}

.lab-dropzone {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 52px;
    border: 1px dashed rgba(0, 120, 212, 0.35);
    border-radius: var(--radius-sm);
    background: linear-gradient(180deg, rgba(0, 120, 212, 0.05) 0%, rgba(0, 120, 212, 0.02) 100%);
    color: var(--muted);
    font-size: 0.84rem;
    overflow: hidden;
    cursor: pointer;
}

.vm-dropzone {
    min-height: 42px;
    font-size: 0.78rem;
}

.toolbar-dropzone {
    min-width: 200px;
    min-height: 34px;
    padding: 0 10px;
    gap: 8px;
}

.lab-dropzone svg {
    color: var(--brand);
}

.lab-file-input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.lab-topbar-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 8px;
}

.lab-center-stage {
    display: grid;
    grid-template-rows: minmax(0, 1fr);
    gap: 12px;
    min-height: 560px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: #fff;
    overflow: hidden;
}

.lab-center-stage.maximized {
    height: calc(100vh - 48px);
    min-height: calc(100vh - 48px);
}

.lab-selected-vm-stage {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    gap: 12px;
    min-height: 0;
    height: 100%;
}

.lab-selected-vm-stage.maximized {
    height: 100%;
    min-height: 100%;
}

.lab-student-grid-view,
.lab-student-groups-main {
    display: grid;
    gap: 14px;
    min-height: 0;
}

.lab-student-flat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 12px;
    justify-content: stretch;
    align-content: start;
    overflow: auto;
    overflow-anchor: none;
    padding-right: 4px;
    width: 100%;
}

.lab-student-flat-grid > .lab-student-vm-tile:nth-child(odd) {
    background: #ffffff;
}

.lab-student-flat-grid > .lab-student-vm-tile:nth-child(even) {
    background: #faf9f8;
}

.lab-student-groups-main {
    overflow: auto;
    overflow-anchor: none;
    padding-right: 4px;
}

.lab-student-group-main {
    display: grid;
    gap: 12px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--bg-shell);
}

.lab-student-vm-tile,
.lab-student-group-main,
.lab-console-embed,
.lab-console-frame.embedded {
    overflow-anchor: none;
}

.lab-student-groups-main > .lab-student-group-main:nth-child(odd) {
    background: #ffffff;
}

.lab-student-groups-main > .lab-student-group-main:nth-child(even) {
    background: #faf9f8;
}

.lab-student-vm-grid-main {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 12px;
    justify-content: stretch;
    width: 100%;
}

.lab-student-vm-tile.large {
    display: grid;
    gap: 8px;
    padding: 14px;
    background: #fff;
}

.lab-student-vm-tile.large.empty {
    align-content: start;
}

.lab-console-embed {
    min-height: 240px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: #111;
    position: relative;
    transform: translateZ(0);
    will-change: transform;
    isolation: isolate;
}

.empty-inline-state {
    display: flex;
    align-items: center;
}

.console-placeholder {
    justify-content: center;
    min-height: 240px;
    color: #c8c6c4;
    background: #111;
}

.vm-offline-placeholder {
    flex-direction: column;
    justify-content: center;
    gap: 10px;
    text-align: center;
    padding: 20px;
}

.vm-offline-placeholder strong {
    color: #f3f2f1;
    font-size: 1rem;
}

.vm-offline-placeholder span {
    color: #c8c6c4;
    font-size: 0.82rem;
}

.selected-offline-placeholder {
    min-height: 420px;
}

.lab-selected-console-area {
    min-height: 0;
    height: 100%;
    display: grid;
    transform: translateZ(0);
    will-change: transform;
    isolation: isolate;
}

.lab-selected-vm-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}

.lab-selected-vm-meta {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 8px;
}

.lab-selected-toolbar {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 12px;
}

.lab-selected-toolbar-left,
.lab-selected-toolbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.lab-selected-toolbar-left {
    min-width: 0;
}

.lab-selected-toolbar .toolbar-dropzone {
    justify-self: center;
    align-self: center;
}

.lab-selected-toolbar-right {
    margin-left: 0;
    justify-content: flex-end;
}

.compact-title {
    max-width: 220px;
}

.lab-student-card-toolbar {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 10px;
}

.lab-student-card-toolbar .metric-strip-inline {
    display: flex;
    flex-wrap: nowrap;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: thin;
}

.lab-student-card-toolbar .metric-chip {
    flex: 0 0 auto;
    white-space: nowrap;
}

.lab-student-card-toolbar-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    min-width: 0;
}

.compact-dropzone {
    min-width: 170px;
}

.status-dot {
    width: 12px;
    height: 12px;
    border-radius: 999px;
    display: inline-block;
    flex: 0 0 auto;
}

.status-dot-running {
    background: var(--colorStatusSuccessForeground1);
    box-shadow: 0 0 0 3px rgba(11, 106, 11, 0.12);
}

.status-dot-stopped {
    background: var(--colorStatusDangerForeground1);
    box-shadow: 0 0 0 3px rgba(168, 0, 0, 0.12);
}

.lab-console-frame {
    display: block;
    width: 100%;
    height: 100%;
    min-height: 100%;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: #111;
    transform: translateZ(0);
    backface-visibility: hidden;
    will-change: transform;
}

.lab-console-frame.embedded {
    min-height: 240px;
    border: 0;
    border-radius: 0;
}

.participant-lab-shell {
    display: grid;
    flex: 1 1 auto;
    min-height: 100dvh;
    height: 100dvh;
    min-width: 0;
    overflow: hidden;
}

.participant-lab-main {
    display: grid;
    flex: 1 1 auto;
    min-height: 100dvh;
    height: 100dvh;
    min-width: 0;
    grid-template-rows: auto minmax(0, 1fr);
    overflow: hidden;
}

.participant-lab-stage {
    min-height: 0;
    height: 100%;
    min-height: calc(100dvh - 8px);
    height: calc(100dvh - 8px);
    align-self: stretch;
    overflow: hidden;
    padding-bottom: 0;
    padding: 4px;
    gap: 4px;
    box-sizing: border-box;
}

.participant-instructor-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    justify-content: stretch;
    align-content: start;
    overflow: auto;
    padding-right: 4px;
}

.participant-instructor-tile {
    background: #fff;
}

.participant-instructor-tile .lab-console-embed {
    min-height: 336px;
}

.participant-my-machines-stage {
    display: grid;
    grid-template-rows: minmax(0, 1fr);
    gap: 0;
    min-height: 0;
    height: 100%;
    align-self: stretch;
}

.participant-my-machines-stage > .lab-selected-vm-stage {
    min-height: 0;
    height: 100%;
}

.participant-vm-selector-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.participant-vm-selector-strip.compact {
    margin-top: 0;
}

.participant-vm-selector-strip.in-head {
    justify-content: center;
    flex-wrap: nowrap;
}

.participant-vm-selector {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 34px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--muted);
    padding: 0 10px;
}

.participant-vm-selector.icon-only {
    width: 34px;
    min-width: 34px;
    height: 34px;
    min-height: 34px;
    padding: 0;
    justify-content: center;
}

.participant-vm-selector.icon-only > span:not(.app-icon) {
    display: none;
}

.participant-vm-selector.icon-only .app-icon {
    width: 20px;
    height: 20px;
}

.participant-vm-selector.icon-only .app-icon img {
    object-fit: contain;
}

.participant-vm-selector.selected {
    background: var(--brand-soft);
    border-color: rgba(0, 120, 212, 0.3);
    color: var(--brand-strong);
}

.participant-toolbar-center {
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: start;
}

.participant-toolbar-os-only {
    width: 36px;
    height: 36px;
}

.participant-toolbar-caption {
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 600;
}

.participant-split-layout {
    display: grid;
    min-height: 100%;
    height: 100%;
    min-height: calc(100dvh - 96px);
    align-self: stretch;
    gap: 0;
    align-items: stretch;
}

.participant-split-layout.participant-split-dragging .participant-pane-console,
.participant-split-layout.participant-split-dragging .lab-console-frame,
.participant-split-layout.participant-split-dragging iframe {
    pointer-events: none;
}

.participant-split-layout.vertical {
    grid-template-columns: minmax(0, 1fr) 18px minmax(0, 1fr);
}

.participant-split-layout.horizontal {
    grid-template-rows: minmax(0, 1fr) 18px minmax(0, 1fr);
}

.participant-split-layout-vertical {
    grid-template-columns: minmax(0, 1fr) 18px minmax(0, 1fr);
    min-height: calc(100dvh - 72px);
    height: 100%;
}

.participant-split-layout-horizontal {
    grid-template-rows: minmax(0, 1fr) 18px minmax(0, 1fr);
    height: 100%;
    min-height: calc(100dvh - 72px);
}

.participant-split-pane {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    gap: 10px;
    min-height: 0;
    height: 100%;
    min-height: calc(100dvh - 96px);
    align-self: stretch;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: #fff;
    overflow: hidden;
}

.participant-split-pane-vertical {
    min-height: 0;
    height: 100%;
}

.participant-split-pane-horizontal {
    min-height: 0;
    height: 100%;
}

.participant-pane-head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 10px;
}

.participant-pane-head-self {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
}

.participant-pane-copy {
    display: grid;
    gap: 2px;
}

.participant-pane-copy strong {
    font-size: 0.95rem;
    color: var(--text);
}

.participant-pane-copy span {
    color: var(--muted);
    font-size: 0.78rem;
}

.participant-pane-center {
    justify-self: center;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.participant-pane-status {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    justify-self: end;
    min-width: 0;
}

.participant-pane-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    justify-self: end;
}

.participant-pane-metrics {
    justify-content: flex-start;
}

.participant-pane-os-badge {
    width: 34px;
    height: 34px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: var(--bg-subtle);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    justify-self: center;
    color: var(--brand-strong);
}

.participant-pane-os-badge .app-icon {
    width: 18px;
    height: 18px;
}

.participant-pane-console {
    min-height: 0;
    height: 100%;
    min-height: calc(100dvh - 160px);
    display: grid;
    align-self: stretch;
    overflow: hidden;
}

.participant-split-pane-horizontal .participant-pane-console {
    min-height: 0;
    height: 100%;
}

.participant-pane-console .lab-console-frame,
.participant-pane-console .lab-console-embed {
    min-height: 0;
    height: 100%;
}

.participant-pane-console > .empty-inline-state,
.participant-pane-console > .console-placeholder,
.participant-pane-console > .vm-offline-placeholder {
    display: flex;
    min-height: 0;
    height: 100%;
    width: 100%;
    align-self: stretch;
    align-items: center;
    justify-content: center;
}

.participant-splitter {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: none;
    user-select: none;
}

.participant-splitter.vertical::before {
    content: "";
    width: 1px;
    height: 100%;
    background: var(--line);
}

.participant-splitter.horizontal::before {
    content: "";
    width: 100%;
    height: 1px;
    background: var(--line);
}

.participant-splitter.vertical {
    cursor: col-resize;
}

.participant-splitter.horizontal {
    cursor: row-resize;
    position: relative;
    justify-self: stretch;
}

.participant-splitter-handle {
    position: relative;
    z-index: 1;
    border-radius: 999px;
    border: 1px solid var(--line-strong);
    background: #fff;
    box-shadow: var(--shadow-card);
}

.participant-splitter-handle.vertical {
    width: 10px;
    height: 68px;
}

.participant-splitter-handle.horizontal {
    width: 68px;
    height: 10px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.participant-splitter-handle::before,
.participant-splitter-handle::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: var(--muted-2);
}

.participant-splitter-handle.vertical::before,
.participant-splitter-handle.vertical::after {
    top: 14px;
    bottom: 14px;
    width: 1px;
}

.participant-splitter-handle.vertical::before {
    left: 3px;
}

.participant-splitter-handle.vertical::after {
    right: 3px;
}

.participant-splitter-handle.horizontal::before,
.participant-splitter-handle.horizontal::after {
    left: 14px;
    right: 14px;
    height: 1px;
}

.participant-splitter-handle.horizontal::before {
    top: 3px;
}

.participant-splitter-handle.horizontal::after {
    bottom: 3px;
}

.participant-splitter:hover .participant-splitter-handle,
.participant-splitter:active .participant-splitter-handle {
    border-color: rgba(15, 108, 189, 0.35);
    background: var(--brand-soft);
}

@media (max-width: 1080px) {
    .course-workspace {
        grid-template-columns: 1fr;
    }

    .lab-student-vm-grid-main {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .lab-student-flat-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .lab-selected-vm-head {
        flex-direction: column;
    }

    .lab-student-card-toolbar {
        grid-template-columns: 1fr;
        justify-items: stretch;
    }

    .lab-student-card-toolbar-right {
        justify-content: flex-end;
    }

    .participant-split-layout.vertical {
        grid-template-columns: 1fr;
        grid-template-rows: minmax(0, 1fr) 18px minmax(0, 1fr);
    }
}