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

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

.ans-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);
}

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

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

.ans-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.ans-controls label {
    font-size: 0.95rem;
    color: var(--ai-gray-700);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

.ans-hero-btn {
    font-size: 0.82rem;
    padding: 8px 12px;
    font-weight: 600;
    border: 1px solid var(--ai-gray-300);
    border-radius: var(--ai-radius-md);
    background: #fff;
    color: var(--ai-blue-800);
    cursor: pointer;
}

.ans-hero-btn:hover {
    background: #eff6ff;
    border-color: var(--ai-blue-600);
}

.ans-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;
}

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

.ans-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;
}

.ans-reset-btn:hover {
    background: #fee2e2;
}

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

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

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

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

.ans-readouts {
    padding: 14px 20px;
    background: #f1f5f9;
    border-top: 1px solid #cbd5e1;
}

.ans-readouts--sigma {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
}

.ans-pkpk-label {
    margin: 12px 0 0;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: #64748b;
}

.ans-pkpk-sublabel {
    font-weight: 500;
    text-transform: none;
    letter-spacing: normal;
    color: #94a3b8;
}

.ans-readouts--pkpk {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 10px;
    margin-top: 8px;
}

.ans-hero-btn--active {
    background: #eff6ff;
    border-color: var(--ai-blue-600);
    box-shadow: inset 0 0 0 1px var(--ai-blue-600);
}

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

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

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

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

.ans-readout--naive .ans-readout-value {
    color: #b91c1c;
}

.ans-readout--rss .ans-readout-value {
    color: #166534;
}

.ans-readout--meas .ans-readout-value {
    color: #6d28d9;
}

.ans-readout--pkpk-naive .ans-readout-value {
    color: #b45309;
}

.ans-algebra-wrap {
    margin: 0 20px 20px;
}

.ans-algebra {
    border: 1px solid #e2e8f0;
    border-radius: var(--ai-radius-md);
    background: #fafafa;
}

.ans-algebra summary {
    padding: 12px 16px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--ai-blue-800);
    cursor: pointer;
    list-style-position: inside;
}

.ans-algebra-body {
    padding: 0 16px 16px;
    font-size: 0.95rem;
    color: var(--ai-gray-700);
    line-height: 1.55;
}

.ans-algebra-table {
    width: 100%;
    max-width: 520px;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 0.92rem;
}

.ans-algebra-table th,
.ans-algebra-table td {
    padding: 8px 10px;
    border: 1px solid #e2e8f0;
    text-align: left;
}

.ans-algebra-table th {
    background: #f1f5f9;
    font-weight: 600;
}

.ans-algebra-table td {
    font-variant-numeric: tabular-nums;
}

.ans-hint {
    margin: 12px 20px 0;
    font-size: 0.95rem;
    color: var(--ai-gray-600);
    line-height: 1.5;
}

.ans-footnote {
    margin: 10px 20px 18px;
    font-size: 0.88rem;
    color: #64748b;
    line-height: 1.45;
}

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

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

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