.circuit-diagram {
    --circuit-green: #17684f;
    --circuit-green-dark: #173c2e;
    --circuit-label: #294b39;
    --circuit-border: #e1e9e3;
    max-width: 32rem;
    min-width: 0;
    margin: 1.5rem auto 2rem;
    padding: clamp(.85rem, 3vw, 1.25rem);
    border: 1px solid var(--circuit-border);
    border-radius: .5rem;
    background: #fbfdfb;
}

.circuit-diagram figcaption {
    color: var(--circuit-green-dark);
    font-weight: 700;
    text-align: center;
}

.circuit-diagram svg {
    display: block;
    width: 100%;
    height: auto;
    margin: .75rem auto 0;
    overflow: visible;
}

.circuit-diagram__wire,
.circuit-diagram__ground {
    fill: none;
    stroke: var(--circuit-green);
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 3;
}

.circuit-diagram__resistor {
    fill: #e8f3eb;
    stroke: var(--circuit-green);
    stroke-width: 2.5;
}

.circuit-diagram__source circle {
    fill: #fff;
    stroke: var(--circuit-green);
    stroke-width: 3;
}

.circuit-diagram__source text {
    fill: var(--circuit-green-dark);
    font: 700 1rem system-ui, sans-serif;
}

.circuit-diagram__node {
    fill: var(--circuit-green);
}

.circuit-diagram__label {
    fill: var(--circuit-label);
    font: 600 13px system-ui, sans-serif;
}

.circuit-diagram__muted-label {
    fill: #647276;
    font: 500 11px system-ui, sans-serif;
}

.circuit-diagram__current {
    fill: #a76b2c;
    stroke: #a76b2c;
}

.circuit-diagram__current-label {
    fill: #8a551f;
    font: 600 12px system-ui, sans-serif;
}

.circuit-diagram__heat {
    fill: none;
    stroke: #b42318;
    stroke-linecap: round;
    stroke-width: 1.75;
}

.circuit-diagram__callout rect {
    fill: #fff;
    stroke: #b8cdbd;
    stroke-width: 1.25;
}

.circuit-diagram__callout text {
    fill: var(--circuit-label);
    font: 600 12px system-ui, sans-serif;
}

.thevenin-calculator__circuits .circuit-diagram {
    max-width: none;
    margin: 0;
    padding: 1rem;
}

.thevenin-calculator__circuits .circuit-diagram svg {
    aspect-ratio: 36 / 25;
}

@media (max-width: 560px) {
    .thevenin-calculator__circuits {
        grid-template-columns: 1fr;
    }
}