/* Shared mini-tutorial lesson chrome — two-column read + lab layout */

.mt-lesson-hero {
    text-align: center;
    padding: 20px 20px 8px;
    max-width: 960px;
    margin: 0 auto;
}

.mt-lesson-hero .mt-part-label {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ai-gray-600);
    margin: 0 0 8px;
}

.mt-lesson-hero h1 {
    margin: 0 0 10px;
    color: var(--ai-blue-800);
    font-size: 1.7rem;
}

.mt-lesson-hero p {
    margin: 0;
    color: var(--ai-gray-600);
    line-height: 1.5;
}

/* Two-column: left talking points, wide lab (gold: VR need-for-regulation) */
.mt-lesson-split {
    display: grid;
    grid-template-columns: minmax(240px, 0.78fr) minmax(380px, 1.85fr);
    gap: 22px 32px;
    max-width: 1320px;
    margin: 12px auto 40px;
    padding: 0 20px 0 24px;
    align-items: start;
}

.mt-lesson-read {
    position: sticky;
    top: 12px;
    max-height: calc(100vh - 24px);
    overflow-y: auto;
    padding: 2px 6px 20px 0;
}

.mt-lesson-read h2 {
    margin: 0 0 10px;
    font-size: 1.05rem;
    color: var(--ai-blue-800);
}

.mt-lesson-read h3 {
    margin: 16px 0 6px;
    font-size: 0.9rem;
    color: var(--ai-blue-800);
}

.mt-lesson-read p,
.mt-lesson-read li {
    color: var(--ai-gray-700);
    line-height: 1.55;
    font-size: 0.9rem;
}

.mt-lesson-read ul {
    margin: 0 0 10px;
    padding-left: 1.15rem;
}

/* Numbered talking points (left column) */
.mt-talk-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mt-talk-list li {
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: 10px;
    align-items: start;
    padding: 10px 12px;
    background: #f8fafc;
    border: 1px solid var(--ai-gray-200);
    border-radius: var(--ai-radius-md);
    font-size: 0.86rem;
    line-height: 1.45;
    color: var(--ai-gray-700);
}

.mt-talk-list .mt-talk-n {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: #eff6ff;
    color: #1d4ed8;
    font-size: 0.75rem;
    font-weight: 700;
}

.mt-talk-list strong {
    color: var(--ai-blue-800);
}

.mt-lesson-read .mt-aside-note {
    margin: 16px 0 0;
    padding: 10px 12px;
    background: #fffbeb;
    border: 1px solid #fcd34d;
    border-radius: var(--ai-radius-md);
    font-size: 0.82rem;
    color: #78350f;
    line-height: 1.45;
}

.mt-lesson-lab {
    min-width: 0;
}

/* Stacked charts (stimulus under primary response) */
.im-chart-stack {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 12px;
}

.im-chart-stack .im-canvas-wrap,
.im-chart-stack .mt-canvas-wrap {
    margin-bottom: 0;
}

.im-chart-label {
    margin: 0 0 4px;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--ai-gray-500);
}

.mt-panel {
    background: var(--ai-bg-card, #fff);
    border: 1px solid var(--ai-gray-200);
    border-radius: var(--ai-radius-lg);
    box-shadow: var(--ai-shadow-sm);
    padding: 16px 18px 18px;
    margin-bottom: 14px;
}

.mt-panel-head {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.mt-panel-head h2 {
    margin: 0 0 4px;
    font-size: 1.05rem;
    color: var(--ai-blue-800);
}

.mt-panel-sub {
    margin: 0;
    font-size: 0.82rem;
    color: var(--ai-gray-500);
    line-height: 1.4;
}

/* Knob cluster must sit beside / above its chart — never far below */
.mt-lab-block {
    display: grid;
    grid-template-columns: minmax(140px, 200px) 1fr;
    gap: 14px;
    align-items: start;
}

.mt-knobs {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mt-knobs label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--ai-gray-600);
}

.mt-knobs input[type="range"] {
    width: 100%;
}

.mt-knobs input[type="number"] {
    font-family: var(--ai-font-mono, ui-monospace, monospace);
    font-size: 0.85rem;
    padding: 5px 8px;
    border: 1px solid var(--ai-gray-200);
    border-radius: var(--ai-radius-sm);
}

/* Color-bind knobs to traces (Smith-style) */
.mt-knob-accent-blue input[type="range"] { accent-color: #2563eb; }
.mt-knob-accent-amber input[type="range"] { accent-color: #d97706; }
.mt-knob-accent-rose input[type="range"] { accent-color: #e11d48; }
.mt-knob-accent-emerald input[type="range"] { accent-color: #059669; }
.mt-knob-accent-violet input[type="range"] { accent-color: #7c3aed; }

.mt-trace-blue { color: #2563eb; }
.mt-trace-amber { color: #d97706; }
.mt-trace-rose { color: #e11d48; }
.mt-trace-emerald { color: #059669; }
.mt-trace-violet { color: #7c3aed; }

.mt-canvas-wrap {
    position: relative;
    width: 100%;
    background: #fafbfc;
    border: 1px solid var(--ai-gray-200);
    border-radius: var(--ai-radius-md);
    overflow: hidden;
    min-height: 220px;
}

.mt-canvas-wrap canvas {
    display: block;
    width: 100%;
    height: auto;
    vertical-align: middle;
}

.mt-readouts {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 8px;
    margin-top: 12px;
}

.mt-readout {
    padding: 8px 10px;
    background: var(--ai-gray-50, #f8fafc);
    border: 1px solid var(--ai-gray-200);
    border-radius: var(--ai-radius-sm);
}

.mt-readout-label {
    display: block;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--ai-gray-500);
    margin-bottom: 2px;
}

.mt-readout-value {
    font-family: var(--ai-font-mono, ui-monospace, monospace);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--ai-blue-800);
}

.mt-eq {
    background: #f1f5f9;
    border: 1px solid var(--ai-gray-200);
    border-radius: var(--ai-radius-sm);
    padding: 10px 14px 8px;
    margin: 12px 0 0;
    overflow-x: auto;
    text-align: left;
}

.mt-eq-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 10px;
    margin: 6px 0;
}

.mt-eq-math mjx-container {
    margin: 0.15em 0 !important;
    text-align: left !important;
    display: inline-block !important;
}

.mt-eq mjx-container[jax="CHTML"][display="true"],
.mt-eq .MathJax_Display {
    text-align: left !important;
    margin: 0.4em 0 !important;
}

.mt-eq-eqsign {
    font-family: var(--ai-font-mono, ui-monospace, monospace);
    font-weight: 600;
    color: var(--ai-gray-500);
}

.mt-eq-val {
    font-family: var(--ai-font-mono, ui-monospace, monospace);
    font-size: 0.95rem;
    font-weight: 700;
    color: #1d4ed8;
    min-width: 4rem;
}

.mt-eq-note {
    font-size: 0.78rem;
    color: var(--ai-gray-500);
    margin: 4px 0 0;
}

.mt-aha {
    margin: 12px 0 0;
    padding: 10px 12px;
    background: #eff6ff;
    border-left: 3px solid #2563eb;
    border-radius: 0 var(--ai-radius-sm) var(--ai-radius-sm) 0;
    font-size: 0.88rem;
    color: var(--ai-gray-700);
    line-height: 1.45;
}

.mt-ltspice {
    margin-top: 12px;
    padding: 10px 12px;
    background: #fffbeb;
    border: 1px solid #fcd34d;
    border-radius: var(--ai-radius-md);
    font-size: 0.84rem;
    color: #78350f;
    line-height: 1.45;
}

.mt-ltspice a {
    color: #b45309;
    font-weight: 600;
}

.mt-deeplink {
    margin-top: 12px;
    font-size: 0.88rem;
    line-height: 1.45;
}

.mt-deeplink a {
    color: var(--ai-blue-700);
    font-weight: 600;
}

/* Single-column fallback body (hubs / simple pages) */
.mt-lesson-body {
    max-width: 760px;
    margin: 0 auto;
    padding: 8px 20px 48px;
}

.mt-lesson-body--wide {
    max-width: 960px;
}

@media (max-width: 960px) {
    .mt-lesson-split {
        grid-template-columns: 1fr;
    }
    .mt-lesson-read {
        position: static;
        max-height: none;
        overflow: visible;
        order: 2;
        padding-top: 8px;
        border-top: 1px solid var(--ai-gray-200);
    }
    .mt-lesson-lab {
        order: 1;
    }
    .mt-lab-block {
        grid-template-columns: 1fr;
    }
}

/* Knob accent: violet (used by multi-knob lessons e.g. sar-vs-sigma-delta) */
.im-controls label.accent-violet input[type="range"] { accent-color: #7c3aed; }
.im-controls label.accent-teal input[type="range"] { accent-color: #0d9488; }
.im-legend .leg-violet::before { background: #7c3aed; }
.im-legend .leg-teal::before { background: #0d9488; }
.im-legend .leg-emerald::before { background: #059669; }

/* LTspice / schematic placeholder — swap .im-figure-frame for <img> later */
.im-figure {
    margin: 14px 0 0;
    border: 1.5px dashed var(--ai-gray-300, #cbd5e1);
    border-radius: var(--ai-radius-md, 8px);
    background: #fafbfc;
    overflow: hidden;
}
.im-figure-frame {
    min-height: 180px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 24px 16px;
    color: var(--ai-gray-500, #9ca3af);
    text-align: center;
}
.im-figure-frame svg {
    width: 34px;
    height: 34px;
    opacity: 0.55;
}
.im-figure-label {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.im-figure-sub {
    font-size: 0.72rem;
    color: var(--ai-gray-500, #9ca3af);
}
.im-figure img {
    display: block;
    width: 100%;
    height: auto;
}
.im-figure-caption {
    padding: 8px 12px;
    font-size: 0.78rem;
    color: var(--ai-gray-600, #6b7280);
    border-top: 1px solid var(--ai-gray-200, #e5e7eb);
    background: #fff;
}
.im-figure-caption a {
    color: var(--ai-blue-700, #0f4c9e);
    font-weight: 600;
}

@media (max-width: 560px) {
    .im-panel { padding: 12px; }
    .im-eq-val { font-size: 0.95rem; }
    .im-eq-row { flex-direction: column; align-items: flex-start; gap: 4px; }
}