.vr-layout {
    max-width: var(--ai-container-max);
    margin: 0 auto;
    padding: 0 12px 48px;
}

.vr-panel {
    border: 1px solid var(--ai-gray-200);
    border-radius: var(--ai-radius-lg);
    overflow: hidden;
    background: #fff;
    box-shadow: var(--ai-shadow-md);
}

.vr-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 16px 20px;
    background: #f8fafc;
    border-bottom: 1px solid var(--ai-gray-200);
}

.vr-header h2 {
    margin: 0;
    font-size: 1.28rem;
    color: var(--ai-blue-800);
}

.vr-ref {
    margin: 6px 0 0;
    font-size: 0.92rem;
    color: var(--ai-gray-600);
    font-weight: 400;
}

.vr-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.vr-controls label {
    font-size: 0.95rem;
    color: var(--ai-gray-700);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.vr-controls select {
    font-size: 0.95rem;
    padding: 8px 10px;
    border-radius: var(--ai-radius-sm);
    border: 1px solid var(--ai-gray-300);
    max-width: 240px;
}

.vr-trigger-btn {
    font-size: 1rem;
    padding: 10px 20px;
    font-weight: 600;
    border: none;
    border-radius: var(--ai-radius-md);
    background: var(--ai-blue-600);
    color: #fff;
    cursor: pointer;
}

.vr-trigger-btn:hover {
    background: var(--ai-blue-800);
}

.vr-reset-btn {
    font-size: 0.95rem;
    padding: 10px 16px;
    font-weight: 600;
    border: 1px solid #fca5a5;
    border-radius: var(--ai-radius-md);
    background: #fef2f2;
    color: #b91c1c;
    cursor: pointer;
}

.vr-reset-btn:hover {
    background: #fee2e2;
    border-color: #f87171;
}

.vr-visual-row {
    display: grid;
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 0;
    background: #cbd5e1;
}

.vr-scope-wrap,
.vr-hist-wrap {
    background: #d4d7dc;
    min-height: 400px;
}

.vr-hist-wrap {
    border-left: 2px solid #94a3b8;
}

.vr-scope-canvas,
.vr-hist-canvas {
    display: block;
    width: 100%;
    height: min(58vh, 520px);
    min-height: 400px;
}

.vr-readouts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
    padding: 14px 20px;
    background: #f1f5f9;
    border-top: 1px solid #cbd5e1;
}

.vr-readout {
    padding: 10px 12px;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: var(--ai-radius-sm);
}

.vr-readout-label {
    display: block;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: #64748b;
    margin-bottom: 4px;
}

.vr-readout-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--ai-blue-800);
    font-variant-numeric: tabular-nums;
}

.vr-readout-note {
    font-size: 0.8rem;
    color: #94a3b8;
    margin-top: 4px;
    line-height: 1.35;
}

.vr-readout--sigma .vr-readout-value {
    color: #6d28d9;
}

.vr-readout--fixed .vr-readout-value {
    color: #166534;
}

.vr-hint {
    margin: 12px 20px 16px;
    font-size: 0.95rem;
    color: var(--ai-gray-600);
    line-height: 1.5;
}

.vr-aha {
    margin: 0 20px 20px;
    padding: 14px 16px;
    background: #eff6ff;
    border-left: 4px solid var(--ai-blue-600);
    border-radius: 0 var(--ai-radius-sm) var(--ai-radius-sm) 0;
    font-size: 1rem;
    color: var(--ai-gray-700);
    line-height: 1.55;
}

.vr-lf-note {
    margin: 0 20px 16px;
    padding: 12px 14px;
    background: #fffbeb;
    border: 1px solid #fcd34d;
    border-radius: var(--ai-radius-sm);
    font-size: 0.92rem;
    color: #92400e;
    line-height: 1.5;
}

.mt-lesson-body--wide {
    max-width: 820px;
    margin: 0 auto;
    padding: 0 20px 32px;
}

@media (max-width: 900px) {
    .vr-visual-row {
        grid-template-columns: 1fr;
    }

    .vr-hist-wrap {
        border-left: none;
        border-top: 2px solid #94a3b8;
    }
}