:is(
    [data-unit-visual-extension="current_carrier_direction"],
    [data-unit-visual-extension="charge_gate_counter"],
    [data-unit-visual-extension="charge_quantisation_steps"],
    [data-unit-visual-extension="drift_velocity_microscope"],
    [data-unit-visual-extension="potential_difference_transfer"],
    [data-unit-visual-extension="electric_power_rate"],
    [data-unit-visual-extension="resistance_operating_point"],
    [data-unit-visual-extension="iv_characteristic_lab"],
    [data-unit-visual-extension="sensor_response_curves"],
    [data-unit-visual-extension="resistivity_geometry_lab"]
) {
    --ch09-ink: #18374c;
    --ch09-muted: #647b8a;
    --ch09-line: #879ba9;
    --ch09-surface: #f3f9fb;
    --ch09-accent: #087f9c;
    --ch09-charge: #4d60b5;
    --ch09-energy: #d06a36;
    --ch09-secondary: #7a5aaa;
    --ch09-neutral: #5a7080;
    margin: clamp(1rem, 2.3vw, 1.65rem) 0;
    padding: clamp(0.9rem, 2.25vw, 1.35rem);
    border: 1px solid color-mix(in srgb, var(--ch09-accent) 16%, transparent);
    border-radius: 1.25rem;
    background: linear-gradient(145deg, #fff 0%, var(--ch09-surface) 100%);
    color: var(--ch09-ink);
    box-shadow: 0 0.8rem 2rem rgb(24 55 76 / 0.065);
    overflow: clip;
}

.ch09-visual[data-unit-visual-extension] .ch09-visual-heading {
    display: grid;
    gap: 0.16rem;
    margin-bottom: 0.82rem;
}

.ch09-visual[data-unit-visual-extension] .ch09-visual-heading h3 {
    margin: 0;
    color: var(--ch09-ink);
    font-size: var(--unit-text-heading-medium, 17px);
    font-weight: 750;
    line-height: 1.22;
    letter-spacing: -0.015em;
}

.ch09-visual[data-unit-visual-extension] .ch09-visual-kicker {
    margin: 0;
    color: var(--ch09-accent);
    font-size: var(--unit-text-micro, 11px);
    font-weight: 800;
    letter-spacing: 0.085em;
    text-transform: uppercase;
}

.ch09-visual[data-unit-visual-extension] .ch09-visual-controls.unit-dynamics-controls {
    display: grid;
    width: 100%;
    grid-template-columns: repeat(auto-fit, minmax(min(6.5rem, 100%), 1fr));
    gap: 0.42rem;
    margin: 0 0 0.8rem;
}

.ch09-visual[data-unit-visual-extension] .unit-dynamics-control {
    min-width: 0;
    height: 40px;
    padding: 0.44rem 0.52rem;
    border: 1px solid color-mix(in srgb, var(--ch09-line) 62%, transparent);
    border-radius: 0.72rem;
    background: rgb(255 255 255 / 0.92);
    color: var(--ch09-ink);
    font: inherit;
    font-size: var(--unit-text-meta, 12px);
    font-weight: 740;
    line-height: 1;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    cursor: pointer;
}

.ch09-visual[data-unit-visual-extension] .unit-dynamics-control:hover {
    border-color: var(--ch09-accent);
}

.ch09-visual[data-unit-visual-extension] .unit-dynamics-control[aria-pressed="true"] {
    border-color: var(--ch09-accent);
    background: var(--ch09-accent);
    color: #fff;
    box-shadow: 0 0.32rem 0.85rem rgb(8 127 156 / 0.2);
}

.ch09-visual[data-unit-visual-extension] .unit-dynamics-auto {
    color: var(--ch09-accent);
}

.ch09-visual[data-unit-visual-extension="current_carrier_direction"] .ch09-visual-controls.unit-dynamics-controls {
    display: grid;
    grid-template-columns: max-content max-content max-content max-content;
    width: max-content;
    max-width: 100%;
    gap: 2px;
    padding: 3px;
    border: 1px solid color-mix(in srgb, var(--ch09-accent) 11%, #dce7eb);
    border-radius: 0.72rem;
    background: color-mix(in srgb, var(--ch09-accent) 4%, #fff);
}

.ch09-visual[data-unit-visual-extension="current_carrier_direction"] .ch09-visual-controls.unit-dynamics-controls:has(.unit-dynamics-auto[hidden]) {
    grid-template-columns: max-content max-content max-content;
}

.ch09-visual[data-unit-visual-extension="current_carrier_direction"] .unit-dynamics-control {
    min-height: 32px;
    height: 32px;
    padding: 0.34rem 0.66rem;
    border: 0;
    border-radius: 0.54rem;
    background: transparent;
    box-shadow: none;
}

.ch09-visual[data-unit-visual-extension="current_carrier_direction"] .unit-dynamics-control[aria-pressed="true"] {
    box-shadow: 0 0.2rem 0.55rem rgb(8 127 156 / 0.16);
}

.ch09-visual[data-unit-visual-extension] .ch09-visual-drawing {
    position: relative;
    width: 100%;
    aspect-ratio: var(--ch09-drawing-ratio, 720 / 360);
    border-radius: 0.95rem;
    background: rgb(255 255 255 / 0.76);
    container-type: inline-size;
    overflow: clip;
}

.ch09-visual[data-unit-visual-extension] .ch09-visual-drawing > svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    max-height: none;
    overflow: hidden;
}

.ch09-visual[data-unit-visual-extension] :is(.ch09-math-label, .ch09-text-label) {
    position: absolute;
    z-index: 4;
    max-width: 46%;
    transform: translate(-50%, -50%);
    color: var(--ch09-ink);
    font-size: clamp(0.67rem, 2.12cqi, 0.92rem);
    font-weight: 670;
    line-height: 1.06;
    white-space: nowrap;
    pointer-events: none;
}

.ch09-visual[data-unit-visual-extension] :is(.ch09-math-label, .ch09-text-label)[data-math-anchor="start"] {
    transform: translate(0, -50%);
}

.ch09-visual[data-unit-visual-extension] :is(.ch09-math-label, .ch09-text-label)[data-math-anchor="end"] {
    transform: translate(-100%, -50%);
}

.ch09-visual[data-unit-visual-extension] :is(.is-emphasis, .is-accent) { color: var(--ch09-accent); }
.ch09-visual[data-unit-visual-extension] .is-charge { color: var(--ch09-charge); }
.ch09-visual[data-unit-visual-extension] .is-energy { color: var(--ch09-energy); }
.ch09-visual[data-unit-visual-extension] .is-secondary { color: var(--ch09-secondary); }
.ch09-visual[data-unit-visual-extension] .is-neutral { color: var(--ch09-neutral); }
.ch09-visual[data-unit-visual-extension] .is-warning { color: #a6494f; }

.ch09-visual[data-unit-visual-extension] .ch09-stage-surface {
    fill: rgb(255 255 255 / 0.56);
    stroke: rgb(8 127 156 / 0.12);
    stroke-width: 1;
}

.ch09-visual[data-unit-visual-extension] :is(.ch09-axis, .ch09-axis-line, .ch09-circuit-wire, .ch09-material-grain) {
    fill: none;
    stroke: var(--ch09-neutral);
    stroke-width: 1.35;
    stroke-linecap: round;
}

.ch09-visual[data-unit-visual-extension] :is(.ch09-guide, .ch09-random-path) {
    fill: none;
    stroke: var(--ch09-line);
    stroke-width: 1;
    stroke-dasharray: 5 6;
    opacity: 0.68;
}

.ch09-visual[data-unit-visual-extension] .ch09-random-path.is-explained {
    stroke: var(--ch09-secondary);
    stroke-width: 1.25;
    stroke-dasharray: 4 4;
    opacity: 0.82;
}

.ch09-visual[data-unit-visual-extension] .ch09-random-focus {
    fill: #fff;
    stroke: var(--ch09-secondary);
    stroke-width: 1.7;
}

.ch09-visual[data-unit-visual-extension] .ch09-random-sign {
    stroke: var(--ch09-secondary);
    stroke-width: 1.35;
    stroke-linecap: round;
}

.ch09-visual[data-unit-visual-extension] .ch09-vector {
    fill: none;
    stroke-width: 2.1;
    stroke-linecap: round;
}

.ch09-visual[data-unit-visual-extension] .ch09-arrowhead {
    fill: none;
    stroke-width: 1.9;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.ch09-visual[data-unit-visual-extension] :is(.ch09-vector.is-accent, .ch09-arrowhead.is-accent) { stroke: var(--ch09-accent); }
.ch09-visual[data-unit-visual-extension] :is(.ch09-vector.is-charge, .ch09-arrowhead.is-charge) { stroke: var(--ch09-charge); }
.ch09-visual[data-unit-visual-extension] :is(.ch09-vector.is-energy, .ch09-arrowhead.is-energy) { stroke: var(--ch09-energy); }
.ch09-visual[data-unit-visual-extension] :is(.ch09-vector.is-secondary, .ch09-arrowhead.is-secondary) { stroke: var(--ch09-secondary); }
.ch09-visual[data-unit-visual-extension] :is(.ch09-vector.is-neutral, .ch09-arrowhead.is-neutral) { stroke: var(--ch09-neutral); }

.ch09-visual[data-unit-visual-extension] :is(.ch09-conductor, .ch09-wire-track, .ch09-energy-channel) {
    fill: #edf5f8;
    stroke: #9bb0bd;
    stroke-width: 1.25;
}

.ch09-visual[data-unit-visual-extension] .ch09-gate {
    stroke: var(--ch09-energy);
    stroke-width: 2.2;
    stroke-dasharray: 7 5;
}

.ch09-visual[data-unit-visual-extension] .ch09-particle-dot {
    fill: #fff;
    stroke-width: 1.55;
}

.ch09-visual[data-unit-visual-extension] .ch09-particle.is-electron .ch09-particle-dot,
.ch09-visual[data-unit-visual-extension] .ch09-particle.is-negative .ch09-particle-dot { stroke: var(--ch09-charge); }
.ch09-visual[data-unit-visual-extension] .ch09-particle.is-positive .ch09-particle-dot { stroke: var(--ch09-energy); }
.ch09-visual[data-unit-visual-extension] .ch09-particle-sign { stroke-width: 1.3; stroke-linecap: round; }
.ch09-visual[data-unit-visual-extension] .ch09-particle.is-electron .ch09-particle-sign,
.ch09-visual[data-unit-visual-extension] .ch09-particle.is-negative .ch09-particle-sign { stroke: var(--ch09-charge); }
.ch09-visual[data-unit-visual-extension] .ch09-particle.is-positive .ch09-particle-sign { stroke: var(--ch09-energy); }

.ch09-visual[data-unit-visual-extension] .ch09-step-line {
    fill: none;
    stroke: var(--ch09-accent);
    stroke-width: 1.8;
}

.ch09-visual[data-unit-visual-extension] .ch09-tick { stroke: var(--ch09-neutral); stroke-width: 1.2; }
.ch09-visual[data-unit-visual-extension] .ch09-allowed-point { fill: var(--ch09-accent); stroke: #fff; stroke-width: 1.3; }
.ch09-visual[data-unit-visual-extension] .ch09-selected-point { fill: var(--ch09-energy); stroke: #fff; stroke-width: 2; }
.ch09-visual[data-unit-visual-extension] .ch09-rejected-point { fill: #fff; stroke: #a6494f; stroke-width: 2.2; }

.ch09-visual[data-unit-visual-extension] .ch09-component {
    fill: #fff4ea;
    stroke: var(--ch09-energy);
    stroke-width: 1.6;
}

.ch09-visual[data-unit-visual-extension] .ch09-energy-bar { fill: color-mix(in srgb, var(--ch09-energy) 78%, #fff); }
.ch09-visual[data-unit-visual-extension] .ch09-energy-packet { fill: var(--ch09-energy); opacity: 0.82; }
.ch09-visual[data-unit-visual-extension] .ch09-relation-card { fill: #f1f6f9; stroke: #9aafbb; stroke-width: 1; }
.ch09-visual[data-unit-visual-extension] .ch09-relation-card.is-result { fill: #e9f7f7; stroke: var(--ch09-accent); }

.ch09-visual[data-unit-visual-extension] .ch09-iv-line,
.ch09-visual[data-unit-visual-extension] .ch09-sensor-curve {
    fill: none;
    stroke-width: 2.35;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.ch09-visual[data-unit-visual-extension] :is(.ch09-iv-line.is-accent, .ch09-sensor-curve.is-accent) { stroke: var(--ch09-accent); }
.ch09-visual[data-unit-visual-extension] :is(.ch09-iv-line.is-energy, .ch09-sensor-curve.is-energy) { stroke: var(--ch09-energy); }
.ch09-visual[data-unit-visual-extension] :is(.ch09-iv-line.is-secondary, .ch09-sensor-curve.is-secondary) { stroke: var(--ch09-secondary); }
.ch09-visual[data-unit-visual-extension] .ch09-iv-line.is-muted { stroke: #a7b7c1; stroke-dasharray: 6 6; }
.ch09-visual[data-unit-visual-extension] .ch09-graph-point { fill: var(--ch09-energy); stroke: #fff; stroke-width: 1.7; }

.ch09-visual[data-unit-visual-extension] .ch09-wire-sample {
    fill: #dfecef;
    stroke: var(--ch09-accent);
    stroke-width: 1.5;
}

.ch09-visual[data-unit-visual-extension] .ch09-wire-sample.is-material {
    fill: #f3e9fa;
    stroke: var(--ch09-secondary);
}

.ch09-visual[data-unit-visual-extension] :is(.ch09-visual-state-title, .ch09-visual-caption) { margin-inline: 0.1rem; }
.ch09-visual[data-unit-visual-extension] .ch09-visual-state-title {
    margin-top: 0.76rem;
    margin-bottom: 0.2rem;
    color: var(--ch09-ink);
    font-size: var(--unit-text-body, 15.5px);
    font-weight: 760;
    line-height: 1.26;
}

.ch09-visual[data-unit-visual-extension] .ch09-visual-caption {
    margin-top: 0;
    margin-bottom: 0;
    color: var(--ch09-muted);
    font-size: var(--unit-text-body, 15.5px);
    line-height: 1.52;
}

@keyframes ch09-drift-right {
    from { transform: translateX(-16px); }
    to { transform: translateX(16px); }
}

@keyframes ch09-drift-left {
    from { transform: translateX(16px); }
    to { transform: translateX(-16px); }
}

@keyframes ch09-energy-flow {
    from { transform: translateX(-12px); opacity: 0.58; }
    to { transform: translateX(12px); opacity: 1; }
}

.ch09-visual[data-unit-visual-extension] .ch09-particle {
    transform-box: fill-box;
    transform-origin: center;
    animation-duration: 2.5s;
    animation-delay: var(--ch09-delay, 0s);
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    animation-direction: normal;
}

.ch09-visual[data-unit-visual-extension] .ch09-particle.is-moving-right { animation-name: ch09-drift-right; }
.ch09-visual[data-unit-visual-extension] .ch09-particle.is-moving-left { animation-name: ch09-drift-left; }
.ch09-visual[data-unit-visual-extension] .ch09-energy-packet.is-flowing {
    animation: ch09-energy-flow 1.8s linear var(--ch09-delay, 0s) infinite;
}
.ch09-visual[data-unit-visual-extension].is-motion-paused * {
    animation-play-state: paused !important;
}

@media (max-width: 620px) {
    :is(
        [data-unit-visual-extension="current_carrier_direction"],
        [data-unit-visual-extension="charge_gate_counter"],
        [data-unit-visual-extension="charge_quantisation_steps"],
        [data-unit-visual-extension="drift_velocity_microscope"],
        [data-unit-visual-extension="potential_difference_transfer"],
        [data-unit-visual-extension="electric_power_rate"],
        [data-unit-visual-extension="resistance_operating_point"],
        [data-unit-visual-extension="iv_characteristic_lab"],
        [data-unit-visual-extension="sensor_response_curves"],
        [data-unit-visual-extension="resistivity_geometry_lab"]
    ) {
        padding: 0.84rem;
        border-radius: 1.05rem;
    }

    .ch09-visual[data-unit-visual-extension] .ch09-visual-controls.unit-dynamics-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .ch09-visual[data-unit-visual-extension] .unit-dynamics-auto { grid-column: 1 / -1; }
    .ch09-visual[data-unit-visual-extension] .unit-dynamics-control { height: 38px; }
    .ch09-visual[data-unit-visual-extension="current_carrier_direction"] .ch09-visual-controls.unit-dynamics-controls {
        grid-template-columns: minmax(2.5rem, 0.62fr) minmax(2.8rem, 0.72fr) minmax(4.5rem, 1.12fr) minmax(5.4rem, 1.36fr);
        width: 100%;
    }
    .ch09-visual[data-unit-visual-extension="current_carrier_direction"] .ch09-visual-controls.unit-dynamics-controls:has(.unit-dynamics-auto[hidden]) {
        grid-template-columns: minmax(3.2rem, 0.8fr) minmax(5rem, 1.15fr) minmax(6rem, 1.35fr);
    }
    .ch09-visual[data-unit-visual-extension="current_carrier_direction"] .unit-dynamics-auto { grid-column: auto; }
    .ch09-visual[data-unit-visual-extension="current_carrier_direction"] .unit-dynamics-control {
        min-height: 32px;
        height: 32px;
        padding-inline: 0.18rem;
        font-size: 11px;
    }
    .ch09-visual[data-unit-visual-extension] :is(.ch09-math-label, .ch09-text-label) {
        font-size: clamp(0.6875rem, 2.9cqi, 0.78rem);
    }
}

@media (prefers-reduced-motion: reduce) {
    .ch09-visual[data-unit-visual-extension] * {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
    }
}