:is(
    [data-unit-visual-extension="push_release_timeline"],
    [data-unit-visual-extension="force_ownership_selector"],
    [data-unit-visual-extension="galileo_friction_timeline"],
    [data-unit-visual-extension="resultant_force_lab"],
    [data-unit-visual-extension="mass_weight_field_compare"],
    [data-unit-visual-extension="newton_pair_contact_timeline"],
    [data-unit-visual-extension="drag_speed_relation"],
    [data-unit-visual-extension="fall_parachute_timeline"],
    [data-unit-visual-extension="momentum_state_lab"],
    [data-unit-visual-extension="impulse_stop_timeline"],
    [data-unit-visual-extension="momentum_system_timeline"],
    [data-unit-visual-extension="collision_compare_timeline"],
    [data-unit-visual-extension="momentum_components_map"]
) {
    --ch03-ink: #173b45;
    --ch03-muted: #637a82;
    --ch03-line: #92a9ae;
    --ch03-surface: #f3f8f7;
    --ch03-primary: #187b80;
    --ch03-force: #bd4d43;
    --ch03-velocity: #2c6fa1;
    --ch03-momentum: #7057a8;
    --ch03-result: #2f7b5b;
    --ch03-impulse: #ad762b;
    --ch03-object-a: #247f96;
    --ch03-object-b: #b56b36;
    width: 100%;
    min-width: 0;
    margin: clamp(1rem, 2.4vw, 1.65rem) 0;
    padding: clamp(.88rem, 2.2vw, 1.28rem);
    overflow: clip;
    border: 1px solid color-mix(in srgb, var(--ch03-primary) 17%, transparent);
    border-radius: 1.15rem;
    background:
        radial-gradient(circle at 12% 8%, rgb(24 123 128 / .05), transparent 34%),
        linear-gradient(145deg, #fff 0%, var(--ch03-surface) 100%);
    box-shadow: 0 .78rem 2rem rgb(23 59 69 / .06);
    color: var(--ch03-ink);
}

.ch03-visual[data-unit-visual-extension] [hidden] {
    display: none !important;
}

.ch03-visual[data-unit-visual-extension] .ch03-visual-heading {
    display: grid;
    gap: .2rem;
    margin-bottom: .72rem;
}

.ch03-visual[data-unit-visual-extension] .ch03-visual-heading h3 {
    margin: 0;
    color: var(--ch03-ink);
    font-size: var(--unit-text-heading-medium, 17px);
    font-weight: 780;
    line-height: 1.22;
    letter-spacing: -.015em;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-visual-kicker, .ch03-visual-intro) {
    margin: 0;
}

.ch03-visual[data-unit-visual-extension] .ch03-visual-kicker {
    color: var(--ch03-primary);
    font-size: var(--unit-text-micro, 11px);
    font-weight: 820;
    line-height: 1.2;
    letter-spacing: .075em;
    text-transform: uppercase;
}

.ch03-visual[data-unit-visual-extension] .ch03-visual-intro {
    max-width: 76ch;
    color: var(--ch03-muted);
    font-size: var(--unit-text-meta, 12px);
    line-height: 1.48;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-state-controls, .ch03-timeline) {
    width: 100%;
    min-width: 0;
}

.ch03-visual[data-unit-visual-extension] .ch03-state-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(7.2rem, 100%), 1fr));
    gap: .42rem;
    margin: 0 0 .62rem;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-state-button, .ch03-timeline-button) {
    min-width: 0;
    min-height: 38px;
    padding: .43rem .6rem;
    overflow: hidden;
    border: 1px solid color-mix(in srgb, var(--ch03-line) 67%, transparent);
    border-radius: .66rem;
    background: rgb(255 255 255 / .97);
    color: var(--ch03-ink);
    font: inherit;
    font-size: var(--unit-text-meta, 12px);
    font-weight: 750;
    line-height: 1.15;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: pointer;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-state-button, .ch03-timeline-button):hover {
    border-color: var(--ch03-primary);
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-state-button, .ch03-timeline-button):focus-visible {
    outline: 3px solid color-mix(in srgb, var(--ch03-primary) 25%, transparent);
    outline-offset: 2px;
}

.ch03-visual[data-unit-visual-extension] .ch03-state-button[aria-pressed="true"] {
    border-color: var(--ch03-primary);
    background: var(--ch03-primary);
    box-shadow: 0 .28rem .78rem rgb(24 123 128 / .18);
    color: #fff;
}

.ch03-visual[data-unit-visual-extension] .ch03-timeline {
    display: grid;
    grid-template-columns: auto auto minmax(5rem, 1fr) minmax(5.8rem, auto);
    align-items: center;
    gap: .48rem;
    margin: 0 0 .7rem;
}

.ch03-visual[data-unit-visual-extension] .ch03-timeline-button[aria-pressed="true"] {
    border-color: var(--ch03-primary);
    background: color-mix(in srgb, var(--ch03-primary) 9%, #fff);
    color: var(--ch03-primary);
}

.ch03-visual[data-unit-visual-extension] .ch03-timeline-scrub {
    width: 100%;
    min-width: 0;
    accent-color: var(--ch03-primary);
}

.ch03-visual[data-unit-visual-extension] .ch03-timeline-phase {
    min-width: 0;
    color: var(--ch03-muted);
    font-size: var(--unit-text-meta, 12px);
    font-variant-numeric: tabular-nums;
    font-weight: 720;
    line-height: 1.2;
    text-align: right;
    white-space: nowrap;
}

.ch03-visual[data-unit-visual-extension] .ch03-visual-drawing {
    position: relative;
    width: 100%;
    min-width: 0;
    overflow: hidden;
    border: 1px solid color-mix(in srgb, var(--ch03-line) 38%, transparent);
    border-radius: .86rem;
    background:
        linear-gradient(rgb(146 169 174 / .045) 1px, transparent 1px),
        linear-gradient(90deg, rgb(146 169 174 / .045) 1px, transparent 1px),
        #fff;
    background-size: 36px 36px;
}

.ch03-visual[data-unit-visual-extension] .ch03-visual-drawing svg {
    display: block;
    width: 100%;
    height: 100%;
    overflow: visible;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label) {
    position: absolute;
    z-index: 2;
    max-width: 46%;
    padding: .13rem .28rem;
    border-radius: .34rem;
    background: rgb(255 255 255 / .9);
    color: var(--ch03-ink);
    font-size: clamp(.82rem, 1.85vw, 1rem);
    font-weight: 700;
    line-height: 1.14;
    pointer-events: none;
    transform: translate(-50%, -50%);
    white-space: nowrap;
}

.ch03-visual[data-unit-visual-extension] .ch03-text-label {
    font-size: clamp(.8rem, 1.72vw, .95rem);
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label)[data-label-anchor="start"] {
    transform: translate(0, -50%);
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label)[data-label-anchor="end"] {
    transform: translate(-100%, -50%);
}

.ch03-visual[data-unit-visual-extension] .ch03-math-label mjx-container {
    margin: 0 !important;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label).is-muted {
    color: var(--ch03-muted);
    font-weight: 620;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label).is-force {
    color: var(--ch03-force);
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label).is-velocity {
    color: var(--ch03-velocity);
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label).is-momentum {
    color: var(--ch03-momentum);
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label).is-result {
    color: var(--ch03-result);
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label).is-impulse {
    color: var(--ch03-impulse);
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label).is-object {
    color: var(--ch03-ink);
    font-weight: 790;
}

.ch03-visual[data-unit-visual-extension] .ch03-wide-result {
    width: 82%;
    max-width: 82%;
    text-align: center;
    white-space: normal;
}

.ch03-visual[data-unit-visual-extension] .is-lane-a {
    color: var(--ch03-object-a);
}

.ch03-visual[data-unit-visual-extension] .is-lane-b {
    color: var(--ch03-object-b);
}

.ch03-visual[data-unit-visual-extension] .is-panel-title {
    color: var(--ch03-primary);
    font-size: clamp(.72rem, 1.5vw, .84rem);
    font-weight: 840;
    letter-spacing: .07em;
}

.ch03-visual[data-unit-visual-extension] .ch03-state-summary {
    display: grid;
    gap: .18rem;
    margin-top: .68rem;
    padding: .15rem 0 .08rem .76rem;
    border-left: 3px solid color-mix(in srgb, var(--ch03-primary) 72%, transparent);
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-state-title, .ch03-state-text, .ch03-state-result) {
    margin: 0;
}

.ch03-visual[data-unit-visual-extension] .ch03-state-title {
    color: var(--ch03-ink);
    font-size: var(--unit-text-body, 14px);
    line-height: 1.3;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-state-text, .ch03-state-result) {
    color: var(--ch03-muted);
    font-size: var(--unit-text-meta, 12px);
    line-height: 1.46;
}

.ch03-visual[data-unit-visual-extension] .ch03-state-result {
    color: var(--ch03-result);
    font-weight: 750;
}

/* Quiet constructions and boundaries */
.ch03-visual[data-unit-visual-extension] :is(
    .ch03-track,
    .ch03-ground,
    .ch03-reference-axis,
    .ch03-motion-lane,
    .ch03-graph-axis,
    .ch03-table-leg
) {
    fill: none;
    stroke: var(--ch03-line);
    stroke-linecap: round;
    stroke-width: 1.55;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-construction-line, .ch03-system-boundary) {
    fill: none;
    stroke: color-mix(in srgb, var(--ch03-line) 78%, transparent);
    stroke-dasharray: 6 7;
    stroke-linecap: round;
    stroke-width: 1.35;
}

.ch03-visual[data-unit-visual-extension] .ch03-system-boundary {
    fill: rgb(24 123 128 / .025);
}

.ch03-visual[data-unit-visual-extension] .ch03-surface-mark {
    stroke: color-mix(in srgb, var(--ch03-line) 76%, transparent);
    stroke-linecap: round;
    stroke-width: 1.25;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-history-dot, .ch03-origin-dot, .ch03-graph-point) {
    fill: var(--ch03-primary);
    stroke: #fff;
    stroke-width: 1.25;
}

.ch03-visual[data-unit-visual-extension] .ch03-origin-dot.is-force {
    fill: var(--ch03-force);
}

.ch03-visual[data-unit-visual-extension] .ch03-origin-dot.is-velocity {
    fill: var(--ch03-velocity);
}

.ch03-visual[data-unit-visual-extension] .ch03-origin-dot.is-momentum {
    fill: var(--ch03-momentum);
}

.ch03-visual[data-unit-visual-extension] .ch03-origin-dot.is-result {
    fill: var(--ch03-result);
}

/* Main vectors: shaft and open marker share one semantic colour. */
.ch03-visual[data-unit-visual-extension] .ch03-vector {
    fill: none;
    stroke-linecap: round;
    stroke-width: 3;
}

.ch03-visual[data-unit-visual-extension] .ch03-vector.is-force {
    stroke: var(--ch03-force);
}

.ch03-visual[data-unit-visual-extension] .ch03-vector.is-velocity {
    stroke: var(--ch03-velocity);
}

.ch03-visual[data-unit-visual-extension] .ch03-vector.is-momentum {
    stroke: var(--ch03-momentum);
}

.ch03-visual[data-unit-visual-extension] .ch03-vector.is-result {
    stroke: var(--ch03-result);
}

.ch03-visual[data-unit-visual-extension] .ch03-vector.is-impulse {
    stroke: var(--ch03-impulse);
}

.ch03-visual[data-unit-visual-extension] .ch03-arrowhead {
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.8;
}

.ch03-visual[data-unit-visual-extension] .ch03-arrowhead.is-force {
    stroke: var(--ch03-force);
}

.ch03-visual[data-unit-visual-extension] .ch03-arrowhead.is-velocity {
    stroke: var(--ch03-velocity);
}

.ch03-visual[data-unit-visual-extension] .ch03-arrowhead.is-momentum {
    stroke: var(--ch03-momentum);
}

.ch03-visual[data-unit-visual-extension] .ch03-arrowhead.is-result {
    stroke: var(--ch03-result);
}

.ch03-visual[data-unit-visual-extension] .ch03-arrowhead.is-impulse {
    stroke: var(--ch03-impulse);
}

/* Objects */
.ch03-visual[data-unit-visual-extension] .ch03-cart-body {
    fill: #f7fbfb;
    stroke: var(--ch03-object-a);
    stroke-width: 2.2;
}

.ch03-visual[data-unit-visual-extension] .ch03-trolley.is-b .ch03-cart-body {
    stroke: var(--ch03-object-b);
}

.ch03-visual[data-unit-visual-extension] .ch03-wheel {
    fill: var(--ch03-ink);
    stroke: #fff;
    stroke-width: 1.3;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-arm, .ch03-palm) {
    fill: #f0c5a6;
    stroke: #956d55;
    stroke-width: 1.65;
}

.ch03-visual[data-unit-visual-extension] .ch03-book {
    fill: #f6ddca;
    stroke: var(--ch03-object-b);
    stroke-width: 2;
}

.ch03-visual[data-unit-visual-extension] .ch03-table-top {
    fill: #e8f3f4;
    stroke: var(--ch03-object-a);
    stroke-width: 2;
}

.ch03-visual[data-unit-visual-extension] :is(.ch03-block, .ch03-instrument) {
    fill: #eaf4f4;
    stroke: var(--ch03-primary);
    stroke-width: 2.25;
}

.ch03-visual[data-unit-visual-extension] .ch03-celestial-body {
    fill: #dfeff2;
    stroke: var(--ch03-object-a);
    stroke-width: 2.2;
}

.ch03-visual[data-unit-visual-extension] .ch03-celestial-body.is-moon {
    fill: #ecebe7;
    stroke: #807f78;
}

.ch03-visual[data-unit-visual-extension] .ch03-buffer {
    fill: none;
    stroke-linecap: round;
    stroke-width: 4;
}

.ch03-visual[data-unit-visual-extension] .ch03-buffer.is-a {
    stroke: var(--ch03-object-a);
}

.ch03-visual[data-unit-visual-extension] .ch03-buffer.is-b {
    stroke: var(--ch03-object-b);
}

.ch03-visual[data-unit-visual-extension] .ch03-person-head {
    fill: #fff;
    stroke: var(--ch03-ink);
    stroke-width: 2;
}

.ch03-visual[data-unit-visual-extension] .ch03-person-line {
    stroke: var(--ch03-ink);
    stroke-linecap: round;
    stroke-width: 3;
}

.ch03-visual[data-unit-visual-extension] .ch03-parachute-canopy {
    fill: #e8f3f4;
    stroke: var(--ch03-primary);
    stroke-linejoin: round;
    stroke-width: 2.1;
}

.ch03-visual[data-unit-visual-extension] .ch03-parachute-cord {
    stroke: var(--ch03-line);
    stroke-width: 1.35;
}

.ch03-visual[data-unit-visual-extension] .ch03-barrier {
    stroke: var(--ch03-ink);
    stroke-width: 5;
}

.ch03-visual[data-unit-visual-extension] .ch03-cushion {
    fill: #f4d7a4;
    stroke: var(--ch03-impulse);
    stroke-width: 2;
}

.ch03-visual[data-unit-visual-extension] .ch03-panel {
    fill: rgb(255 255 255 / .78);
    stroke: color-mix(in srgb, var(--ch03-line) 45%, transparent);
    stroke-width: 1.25;
}

.ch03-visual[data-unit-visual-extension] .ch03-object-dot {
    stroke: #fff;
    stroke-width: 1.3;
}

.ch03-visual[data-unit-visual-extension] .ch03-object-dot.is-a {
    fill: var(--ch03-object-a);
}

.ch03-visual[data-unit-visual-extension] .ch03-object-dot.is-b {
    fill: var(--ch03-object-b);
}

/* Graph evidence */
.ch03-visual[data-unit-visual-extension] .ch03-graph-curve {
    fill: none;
    stroke: var(--ch03-velocity);
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 3;
}

.ch03-visual[data-unit-visual-extension] .ch03-force-curve {
    fill: none;
    stroke: var(--ch03-force);
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 3;
}

.ch03-visual[data-unit-visual-extension] .ch03-impulse-area {
    fill: color-mix(in srgb, var(--ch03-impulse) 18%, transparent);
    stroke: none;
}

@media (max-width: 620px) {
    :is(
        [data-unit-visual-extension="push_release_timeline"],
        [data-unit-visual-extension="force_ownership_selector"],
        [data-unit-visual-extension="galileo_friction_timeline"],
        [data-unit-visual-extension="resultant_force_lab"],
        [data-unit-visual-extension="mass_weight_field_compare"],
        [data-unit-visual-extension="newton_pair_contact_timeline"],
        [data-unit-visual-extension="drag_speed_relation"],
        [data-unit-visual-extension="fall_parachute_timeline"],
        [data-unit-visual-extension="momentum_state_lab"],
        [data-unit-visual-extension="impulse_stop_timeline"],
        [data-unit-visual-extension="momentum_system_timeline"],
        [data-unit-visual-extension="collision_compare_timeline"],
        [data-unit-visual-extension="momentum_components_map"]
    ) {
        padding: .74rem;
        border-radius: .94rem;
    }

    .ch03-visual[data-unit-visual-extension] .ch03-state-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .ch03-visual[data-unit-visual-extension] .ch03-timeline {
        grid-template-columns: auto auto minmax(4.5rem, 1fr);
        gap: .38rem;
    }

    .ch03-visual[data-unit-visual-extension] .ch03-timeline-phase {
        grid-column: 1 / -1;
        text-align: left;
    }

    .ch03-visual[data-unit-visual-extension] :is(.ch03-state-button, .ch03-timeline-button) {
        min-height: 36px;
        padding: .4rem .48rem;
    }

    .ch03-visual[data-unit-visual-extension] :is(.ch03-math-label, .ch03-text-label) {
        max-width: 49%;
        font-size: .82rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .ch03-visual[data-unit-visual-extension] * {
        scroll-behavior: auto !important;
        transition-duration: .01ms !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
    }
}