/* Impedance Matching mini-tutorial lesson chrome */

.mt-lesson-body {
    max-width: 760px;
    margin: 0 auto;
    padding: 8px 20px 48px;
}

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

.mt-lesson-body .explanation-section {
    margin-bottom: 28px;
}

.mt-lesson-body h2 {
    color: var(--ai-blue-800);
    margin: 0 0 12px;
    font-size: 1.15rem;
}

.mt-lesson-body p,
.mt-lesson-body li {
    color: var(--ai-gray-700);
    line-height: 1.55;
}

.mt-lesson-body ul {
    padding-left: 1.25rem;
}

.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;
}

/* Wide layout: left talking points · lab (VR gold standard) */
.mt-lesson-split {
    display: grid;
    grid-template-columns: minmax(220px, 0.72fr) minmax(360px, 1.55fr);
    gap: 22px 28px;
    max-width: 1480px;
    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 p,
.mt-lesson-read li {
    color: var(--ai-gray-700);
    line-height: 1.55;
    font-size: 0.9rem;
}

.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;
}

/* Interactive panel */
.im-demo {
    max-width: 1320px;
    margin: 12px auto 28px;
    padding: 0 16px;
}

.mt-lesson-lab .im-demo {
    max-width: none;
    margin: 0;
    padding: 0;
}

.im-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;
}

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

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

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

.im-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.im-preset-btn {
    padding: 5px 10px;
    font-size: 0.78rem;
    font-weight: 600;
    border: 2px solid #e2e8f0;
    border-radius: var(--ai-radius-md);
    background: #f8fafc;
    color: #334155;
    cursor: pointer;
}

.im-preset-btn:hover {
    background: #f1f5f9;
}

.im-preset-btn.active {
    background: #2563eb;
    border-color: transparent;
    color: #fff;
}

.im-controls {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 10px 14px;
    margin-bottom: 14px;
}

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

.im-controls input[type="range"] {
    width: 100%;
    accent-color: var(--ai-blue-600, #2563eb);
}

.im-controls 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);
}

.im-canvas-wrap {
    position: relative;
    width: 100%;
    max-width: 520px;
    margin: 0 auto 12px;
    background: #fafbfc;
    border: 1px solid var(--ai-gray-200);
    border-radius: var(--ai-radius-md);
    overflow: hidden;
}

.im-canvas-wrap--wide {
    max-width: 100%;
}

.im-chart-stack {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 12px;
}

.im-chart-stack .im-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);
}

.im-controls label.accent-blue input[type="range"] { accent-color: #2563eb; }
.im-controls label.accent-amber input[type="range"] { accent-color: #d97706; }
.im-controls label.accent-rose input[type="range"] { accent-color: #e11d48; }
.im-controls label.accent-emerald input[type="range"] { accent-color: #059669; }
.im-controls label.accent-violet input[type="range"] { accent-color: #7c3aed; }

.im-readout-value.is-ok { color: #15803d; }
.im-readout-value.is-mid { color: #1d4ed8; }
.im-readout-value.is-bad { color: #dc2626; }

.im-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 18px;
    font-size: 0.78rem;
    color: var(--ai-gray-600);
    margin: 0 0 10px;
}

.im-legend span::before {
    content: '';
    display: inline-block;
    width: 14px;
    height: 3px;
    margin-right: 6px;
    vertical-align: middle;
    border-radius: 2px;
}

.im-legend .leg-blue::before { background: #2563eb; }
.im-legend .leg-amber::before { background: #d97706; }
.im-legend .leg-rose::before { background: #e11d48; }
.im-legend .leg-slate::before { background: #94a3b8; }
.im-legend .leg-dots::before {
    height: 8px;
    width: 8px;
    border-radius: 50%;
    background: #2563eb;
}

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

.im-readouts {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 8px;
    margin-bottom: 12px;
}

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

.im-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;
}

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

.im-eq {
    background: #f1f5f9;
    border: 1px solid var(--ai-gray-200);
    border-radius: var(--ai-radius-sm);
    padding: 10px 14px 8px;
    margin: 0 0 10px;
    color: #1e293b;
    overflow-x: auto;
    text-align: left;
}

/* One equation row: static pretty math + live plain-text result (no re-typeset on slider) */
.im-eq-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 10px;
    margin: 6px 0;
    text-align: left;
}

.im-eq-math {
    text-align: left;
    flex: 0 1 auto;
    min-width: 0;
}

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

/* Force MathJax display math left-aligned inside our panels */
.im-eq mjx-container[jax="CHTML"][display="true"],
.im-eq .MathJax_Display,
.math-block mjx-container[jax="CHTML"][display="true"],
.math-block .MathJax_Display {
    text-align: left !important;
    margin: 0.4em 0 !important;
}

.im-eq-eqsign {
    font-family: var(--ai-font-mono, ui-monospace, monospace);
    font-weight: 600;
    color: var(--ai-gray-500);
    flex-shrink: 0;
}

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

.im-eq-note {
    font-size: 0.78rem;
    color: var(--ai-gray-500);
    text-align: left;
    margin: -4px 0 8px;
}

.mt-lesson-body .math-block {
    margin: 12px 0;
    overflow-x: auto;
    text-align: left;
}

.im-aha {
    margin: 10px 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;
}

.im-hint {
    margin: 8px 0 0;
    font-size: 0.8rem;
    color: var(--ai-gray-500);
    line-height: 1.4;
}

.im-two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    align-items: start;
}

@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;
    }
}

@media (max-width: 720px) {
    .im-two-col {
        grid-template-columns: 1fr;
    }
}

/* Labeled group of preset-style toggle buttons (architecture / order pickers) */
.im-toggle-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.im-toggle-field > span {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--ai-gray-600);
}

.im-toggle-field .im-presets {
    gap: 6px;
}

/* Requirement bar meters (choosing-lab) */
.im-bars {
    display: grid;
    gap: 8px;
    margin: 2px 0 14px;
}

.im-bar-row {
    display: grid;
    grid-template-columns: 122px 1fr 42px;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    color: var(--ai-gray-600);
}

.im-bar-track {
    height: 8px;
    background: var(--ai-gray-100, #f1f5f9);
    border-radius: 999px;
    overflow: hidden;
}

.im-bar-fill {
    height: 100%;
    background: #2563eb;
    border-radius: 999px;
    transition: width 0.2s ease;
}

.im-bar-val {
    font-family: var(--ai-font-mono, ui-monospace, monospace);
    font-size: 0.72rem;
    text-align: right;
    color: var(--ai-gray-500);
}

/* Decision matrix table (choosing-lab) */
.im-matrix-wrap {
    overflow-x: auto;
    margin: 4px 0 14px;
}

.im-matrix {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.im-matrix th,
.im-matrix td {
    padding: 8px 10px;
    border: 1px solid var(--ai-gray-200);
    text-align: left;
}

.im-matrix thead th {
    background: var(--ai-gray-50, #f8fafc);
    color: var(--ai-gray-600);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    transition: background 0.2s ease, color 0.2s ease;
}

.im-matrix td.im-crit {
    font-weight: 600;
    color: var(--ai-gray-700);
    white-space: nowrap;
}

.im-matrix th.im-win,
.im-matrix td.im-win {
    background: #eff6ff;
    transition: background 0.2s ease, color 0.2s ease;
}

.im-matrix th.im-win {
    color: #1d4ed8;
}

.im-dots {
    letter-spacing: 2px;
    color: #2563eb;
    font-size: 0.95rem;
}

.im-dots .off {
    color: var(--ai-gray-300, #e2e8f0);
}

.im-win-badge {
    display: inline-block;
    margin-left: 6px;
    padding: 1px 7px;
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    background: #2563eb;
    color: #fff;
    border-radius: 999px;
    vertical-align: middle;
}

/* Numbered checklist (choosing-lab) */
.im-checklist {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 10px;
}

.im-checklist li {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    padding: 10px 12px;
    background: var(--ai-gray-50, #f8fafc);
    border: 1px solid var(--ai-gray-200);
    border-radius: var(--ai-radius-sm);
    font-size: 0.88rem;
    color: var(--ai-gray-700);
    line-height: 1.45;
}

.im-checklist .im-step-num {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #2563eb;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
}

/* 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; }
}