:is(
    [data-unit-visual-extension="two_journeys_timeline"],
    [data-unit-visual-extension="average_rate_compare"],
    [data-unit-visual-extension="equal_time_motion_strip"],
    [data-unit-visual-extension="displacement_tangent_timeline"],
    [data-unit-visual-extension="velocity_graph_lab"],
    [data-unit-visual-extension="suvat_graph_derivation"],
    [data-unit-visual-extension="free_fall_timeline"],
    [data-unit-visual-extension="light_gate_g_timeline"],
    [data-unit-visual-extension="projectile_components_timeline"]
) {
    --ch02-ink: #183b49;
    --ch02-muted: #627984;
    --ch02-line: #91a7b0;
    --ch02-surface: #f2f8f9;
    --ch02-primary: #147f95;
    --ch02-route-a: #167f95;
    --ch02-route-b: #b26336;
    --ch02-displacement: #6955ad;
    --ch02-velocity: #2471a8;
    --ch02-acceleration: #b44945;
    --ch02-positive: #3b8061;
    --ch02-negative: #b44d48;
    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(--ch02-primary) 17%, transparent);
    border-radius: 1.15rem;
    background: linear-gradient(145deg, #fff 0%, var(--ch02-surface) 100%);
    box-shadow: 0 .78rem 2rem rgb(24 59 73 / .06);
    color: var(--ch02-ink);
}

.ch02-visual[data-unit-visual-extension] [hidden] {
    display: none !important;
}

.ch02-visual[data-unit-visual-extension] .ch02-visual-heading {
    display: grid;
    gap: .14rem;
    margin-bottom: .72rem;
}

.ch02-visual[data-unit-visual-extension] .ch02-visual-heading h3 {
    margin: 0;
    color: var(--ch02-ink);
    font-size: var(--unit-text-heading-medium, 17px);
    font-weight: 770;
    line-height: 1.22;
    letter-spacing: -.015em;
}

.ch02-visual[data-unit-visual-extension] .ch02-visual-kicker {
    margin: 0;
    color: var(--ch02-primary);
    font-size: var(--unit-text-micro, 11px);
    font-weight: 820;
    line-height: 1.2;
    letter-spacing: .075em;
    text-transform: uppercase;
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-state-controls, .ch02-timeline) {
    width: 100%;
    min-width: 0;
}

.ch02-visual[data-unit-visual-extension] .ch02-state-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(7.35rem, 100%), 1fr));
    gap: .42rem;
    margin: 0 0 .62rem;
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-state-button, .ch02-timeline-button) {
    min-width: 0;
    min-height: 37px;
    padding: .42rem .58rem;
    overflow: hidden;
    border: 1px solid color-mix(in srgb, var(--ch02-line) 66%, transparent);
    border-radius: .66rem;
    background: rgb(255 255 255 / .96);
    color: var(--ch02-ink);
    font: inherit;
    font-size: var(--unit-text-meta, 12px);
    font-weight: 740;
    line-height: 1.15;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: pointer;
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-state-button, .ch02-timeline-button):hover {
    border-color: var(--ch02-primary);
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-state-button, .ch02-timeline-button):focus-visible {
    outline: 3px solid color-mix(in srgb, var(--ch02-primary) 24%, transparent);
    outline-offset: 2px;
}

.ch02-visual[data-unit-visual-extension] .ch02-state-button[aria-pressed="true"] {
    border-color: var(--ch02-primary);
    background: var(--ch02-primary);
    box-shadow: 0 .28rem .78rem rgb(20 127 149 / .18);
    color: #fff;
}

.ch02-visual[data-unit-visual-extension] .ch02-timeline {
    display: grid;
    grid-template-columns: auto auto minmax(5rem, 1fr) minmax(5.8rem, auto);
    align-items: center;
    gap: .48rem;
    margin: 0 0 .7rem;
}

.ch02-visual[data-unit-visual-extension] .ch02-timeline-button[aria-pressed="true"] {
    border-color: var(--ch02-primary);
    background: color-mix(in srgb, var(--ch02-primary) 9%, #fff);
    color: var(--ch02-primary);
}

.ch02-visual[data-unit-visual-extension] .ch02-timeline-scrub {
    width: 100%;
    min-width: 0;
    accent-color: var(--ch02-primary);
}

.ch02-visual[data-unit-visual-extension] .ch02-timeline-phase {
    min-width: 0;
    color: var(--ch02-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;
}

.ch02-visual[data-unit-visual-extension] .ch02-visual-drawing {
    position: relative;
    width: 100%;
    min-width: 0;
    aspect-ratio: 720 / 400;
    overflow: hidden;
    border: 1px solid color-mix(in srgb, var(--ch02-line) 38%, transparent);
    border-radius: .86rem;
    background:
        radial-gradient(circle at 12% 10%, rgb(20 127 149 / .045), transparent 32%),
        #fff;
}

.ch02-visual[data-unit-visual-extension] .ch02-visual-drawing svg {
    display: block;
    width: 100%;
    height: 100%;
    overflow: visible;
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-math-label, .ch02-text-label) {
    position: absolute;
    z-index: 2;
    max-width: 42%;
    padding: .12rem .26rem;
    border-radius: .34rem;
    background: rgb(255 255 255 / .88);
    color: var(--ch02-ink);
    font-size: clamp(.78rem, 1.75vw, .94rem);
    font-weight: 690;
    line-height: 1.15;
    pointer-events: none;
    transform: translate(-50%, -50%);
    white-space: nowrap;
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-math-label, .ch02-text-label)[data-label-anchor="start"] {
    transform: translate(0, -50%);
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-math-label, .ch02-text-label)[data-label-anchor="end"] {
    transform: translate(-100%, -50%);
}

.ch02-visual[data-unit-visual-extension] .ch02-text-label {
    font-size: clamp(.76rem, 1.65vw, .9rem);
}

.ch02-visual[data-unit-visual-extension] .ch02-math-label mjx-container {
    margin: 0 !important;
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-math-label, .ch02-text-label).is-muted {
    color: var(--ch02-muted);
    font-weight: 610;
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-math-label, .ch02-text-label).is-strong {
    font-weight: 790;
}

.ch02-visual[data-unit-visual-extension] .is-route-a { color: var(--ch02-route-a); }
.ch02-visual[data-unit-visual-extension] .is-route-b { color: var(--ch02-route-b); }
.ch02-visual[data-unit-visual-extension] .is-route { color: var(--ch02-route-a); }
.ch02-visual[data-unit-visual-extension] .is-displacement { color: var(--ch02-displacement); }
.ch02-visual[data-unit-visual-extension] .is-velocity { color: var(--ch02-velocity); }
.ch02-visual[data-unit-visual-extension] .is-acceleration { color: var(--ch02-acceleration); }
.ch02-visual[data-unit-visual-extension] .is-component { color: var(--ch02-route-a); }
.ch02-visual[data-unit-visual-extension] .is-positive { color: var(--ch02-positive); }
.ch02-visual[data-unit-visual-extension] .is-negative { color: var(--ch02-negative); }
.ch02-visual[data-unit-visual-extension] .is-result { color: var(--ch02-displacement); }

.ch02-visual[data-unit-visual-extension] .ch02-state-summary {
    display: grid;
    gap: .18rem;
    margin-top: .68rem;
    padding: .15rem 0 .08rem .76rem;
    border-left: 3px solid color-mix(in srgb, var(--ch02-primary) 72%, transparent);
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-state-title, .ch02-state-text, .ch02-state-result) {
    margin: 0;
}

.ch02-visual[data-unit-visual-extension] .ch02-state-title {
    color: var(--ch02-ink);
    font-size: var(--unit-text-body, 14px);
    line-height: 1.3;
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-state-text, .ch02-state-result) {
    color: var(--ch02-muted);
    font-size: var(--unit-text-meta, 12px);
    line-height: 1.45;
}

.ch02-visual[data-unit-visual-extension] .ch02-state-result {
    color: var(--ch02-displacement);
    font-weight: 740;
}

/* Geometry hierarchy: references and constructions stay pale; evidence and vectors carry role colour. */
.ch02-visual[data-unit-visual-extension] :is(
    .ch02-reference-axis,
    .ch02-motion-lane,
    .ch02-motion-track,
    .ch02-ground,
    .ch02-mini-axis
) {
    fill: none;
    stroke: var(--ch02-line);
    stroke-linecap: round;
    stroke-width: 1.45;
}

.ch02-visual[data-unit-visual-extension] :is(
    .ch02-time-guide,
    .ch02-construction-line,
    .ch02-construction-guide,
    .ch02-projectile-guides line,
    .ch02-dimension-line
) {
    fill: none;
    stroke: color-mix(in srgb, var(--ch02-line) 74%, transparent);
    stroke-dasharray: 5 6;
    stroke-linecap: round;
    stroke-width: 1.2;
}

.ch02-visual[data-unit-visual-extension] .ch02-axis-tick {
    stroke: var(--ch02-line);
    stroke-width: 1.25;
}

.ch02-visual[data-unit-visual-extension] .ch02-vector {
    fill: none;
    stroke-linecap: round;
    stroke-width: 2.7;
}

.ch02-visual[data-unit-visual-extension] .ch02-vector.is-axis { stroke: var(--ch02-ink); }
.ch02-visual[data-unit-visual-extension] .ch02-vector.is-route { stroke: var(--ch02-route-a); }
.ch02-visual[data-unit-visual-extension] .ch02-vector.is-displacement { stroke: var(--ch02-displacement); }
.ch02-visual[data-unit-visual-extension] .ch02-vector.is-velocity { stroke: var(--ch02-velocity); }
.ch02-visual[data-unit-visual-extension] .ch02-vector.is-acceleration { stroke: var(--ch02-acceleration); }
.ch02-visual[data-unit-visual-extension] .ch02-vector.is-component { stroke: var(--ch02-route-a); }

.ch02-visual[data-unit-visual-extension] .ch02-arrowhead {
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 2.15;
}

.ch02-visual[data-unit-visual-extension] .ch02-arrowhead.is-axis { stroke: var(--ch02-ink); }
.ch02-visual[data-unit-visual-extension] .ch02-arrowhead.is-route { stroke: var(--ch02-route-a); }
.ch02-visual[data-unit-visual-extension] .ch02-arrowhead.is-displacement { stroke: var(--ch02-displacement); }
.ch02-visual[data-unit-visual-extension] .ch02-arrowhead.is-velocity { stroke: var(--ch02-velocity); }
.ch02-visual[data-unit-visual-extension] .ch02-arrowhead.is-acceleration { stroke: var(--ch02-acceleration); }
.ch02-visual[data-unit-visual-extension] .ch02-arrowhead.is-component { stroke: var(--ch02-route-a); }

.ch02-visual[data-unit-visual-extension] .ch02-route {
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 4;
}

.ch02-visual[data-unit-visual-extension] .ch02-route.is-a { stroke: var(--ch02-route-a); }
.ch02-visual[data-unit-visual-extension] .ch02-route.is-b { stroke: var(--ch02-route-b); }
.ch02-visual[data-unit-visual-extension] .ch02-rate-path { stroke: var(--ch02-route-a); }
.ch02-visual[data-unit-visual-extension] .ch02-rate-path.is-return { stroke: var(--ch02-route-b); }
.ch02-visual[data-unit-visual-extension] .ch02-rate-displacement { stroke: var(--ch02-displacement); }

.ch02-visual[data-unit-visual-extension] :is(.ch02-semantic-point, .ch02-location-point, .ch02-motion-dot, .ch02-history-dot, .ch02-graph-point) {
    stroke: #fff;
    stroke-width: 1.6;
}

.ch02-visual[data-unit-visual-extension] .ch02-semantic-point.is-a { fill: var(--ch02-route-a); }
.ch02-visual[data-unit-visual-extension] .ch02-semantic-point.is-b { fill: var(--ch02-route-b); }
.ch02-visual[data-unit-visual-extension] .ch02-location-point { fill: var(--ch02-ink); }
.ch02-visual[data-unit-visual-extension] .ch02-location-point.is-finish { fill: var(--ch02-displacement); }
.ch02-visual[data-unit-visual-extension] .ch02-motion-dot.is-constant { fill: var(--ch02-route-a); }
.ch02-visual[data-unit-visual-extension] .ch02-motion-dot.is-accelerating { fill: var(--ch02-acceleration); }
.ch02-visual[data-unit-visual-extension] .ch02-history-dot { fill: var(--ch02-muted); }
.ch02-visual[data-unit-visual-extension] .ch02-graph-point.is-primary { fill: var(--ch02-primary); }
.ch02-visual[data-unit-visual-extension] .ch02-graph-point.is-secondary { fill: var(--ch02-route-b); }

.ch02-visual[data-unit-visual-extension] :is(.ch02-graph-curve, .ch02-graph-line, .ch02-tangent-line, .ch02-best-fit) {
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.ch02-visual[data-unit-visual-extension] .ch02-graph-curve {
    stroke: var(--ch02-primary);
    stroke-width: 3;
}

.ch02-visual[data-unit-visual-extension] .ch02-graph-line {
    stroke: var(--ch02-primary);
    stroke-width: 2.8;
}

.ch02-visual[data-unit-visual-extension] .ch02-tangent-line {
    stroke: var(--ch02-displacement);
    stroke-width: 2.7;
}

.ch02-visual[data-unit-visual-extension] .ch02-area-strip {
    fill: rgb(20 127 149 / .13);
    stroke: rgb(20 127 149 / .54);
    stroke-width: 1;
}

.ch02-visual[data-unit-visual-extension] .ch02-signed-area {
    stroke-width: 1.5;
}

.ch02-visual[data-unit-visual-extension] .ch02-signed-area.is-positive {
    fill: rgb(59 128 97 / .18);
    stroke: var(--ch02-positive);
}

.ch02-visual[data-unit-visual-extension] .ch02-signed-area.is-negative {
    fill: rgb(180 77 72 / .16);
    stroke: var(--ch02-negative);
}

.ch02-visual[data-unit-visual-extension] .ch02-suvat-rectangle {
    fill: rgb(20 127 149 / .12);
    stroke: var(--ch02-route-a);
    stroke-width: 1.4;
}

.ch02-visual[data-unit-visual-extension] .ch02-suvat-triangle {
    fill: rgb(105 85 173 / .16);
    stroke: var(--ch02-displacement);
    stroke-width: 1.4;
}

.ch02-visual[data-unit-visual-extension] .ch02-ball {
    fill: var(--ch02-route-b);
    stroke: #fff;
    stroke-width: 2;
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-apparatus-body, .ch02-wire) {
    fill: none;
    stroke: var(--ch02-ink);
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 2.7;
}

.ch02-visual[data-unit-visual-extension] .ch02-sensor {
    fill: #dce9ec;
    stroke: var(--ch02-ink);
    stroke-width: 2;
}

.ch02-visual[data-unit-visual-extension] .ch02-gate-beam {
    stroke: var(--ch02-primary);
    stroke-dasharray: 5 4;
    stroke-width: 2.4;
}

.ch02-visual[data-unit-visual-extension] .ch02-gate-beam.is-blocked {
    stroke: var(--ch02-negative);
    stroke-dasharray: 2 5;
    opacity: .28;
}

.ch02-visual[data-unit-visual-extension] .ch02-logger {
    fill: #f7fafb;
    stroke: var(--ch02-ink);
    stroke-width: 2.3;
}

.ch02-visual[data-unit-visual-extension] .ch02-best-fit {
    stroke: var(--ch02-displacement);
    stroke-width: 2.4;
}

.ch02-visual[data-unit-visual-extension] .ch02-card-body {
    fill: #fff;
    stroke: var(--ch02-ink);
    stroke-width: 2.2;
}

.ch02-visual[data-unit-visual-extension] .ch02-opaque-strip {
    fill: var(--ch02-route-b);
}

.ch02-visual[data-unit-visual-extension] .ch02-projectile-path {
    fill: none;
    stroke: var(--ch02-primary);
    stroke-linecap: round;
    stroke-width: 3;
}

.ch02-visual[data-unit-visual-extension] :is(.ch02-component-vector, .ch02-resultant-vector) {
    stroke-width: 2.7;
}

.ch02-visual[data-unit-visual-extension] :is(
    .ch02-state-layer,
    .ch02-math-label,
    .ch02-text-label,
    .ch02-interrupt-card,
    .ch02-history-dot,
    .ch02-projectile-path
) {
    transition: opacity .16s ease;
}

@media (max-width: 540px) {
    .ch02-visual[data-unit-visual-extension] {
        padding: .74rem;
        border-radius: .95rem;
    }

    .ch02-visual[data-unit-visual-extension] .ch02-state-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .ch02-visual[data-unit-visual-extension] .ch02-timeline {
        grid-template-columns: auto auto minmax(0, 1fr);
        gap: .38rem;
    }

    .ch02-visual[data-unit-visual-extension] .ch02-timeline-phase {
        grid-column: 1 / -1;
        text-align: left;
    }

    .ch02-visual[data-unit-visual-extension] :is(.ch02-math-label, .ch02-text-label) {
        max-width: 48%;
        font-size: .76rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .ch02-visual[data-unit-visual-extension] * {
        scroll-behavior: auto !important;
        transition-duration: 0s !important;
    }
}