.resource-section {
    padding: 1.75rem 0;
    border-top: 1px solid var(--line);
}

.resource-section h2,
.calculator-panel h2 {
    font-size: 1.45rem;
}

.resource-card,
.calculator-panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: clamp(1rem, 4vw, 2rem);
}

.resource-card {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.resource-icon {
    flex: none;
    padding: .55rem;
    border-radius: 10px;
    color: var(--blue);
    background: var(--blue-soft);
}

.resource-icon svg {
    display: block;
}

.resource-card p,
.calculator-panel p:last-child {
    margin-bottom: 0;
}

.calculator-panel fieldset {
    min-inline-size: 0;
    border: 0;
    padding: 0;
    margin: 0;
}

.calculator-panel legend {
    font-weight: 650;
    padding: 0;
    margin-bottom: .75rem;
}

.calculator-panel .field-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.calculator-panel label {
    display: block;
    font-size: .92rem;
    font-weight: 600;
}

.calculator-panel input,
.calculator-panel select {
    display: block;
    width: 100%;
    min-width: 0;
    min-height: 44px;
    margin-top: .3rem;
    padding: .5rem .65rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--bg);
    color: var(--ink);
    font: inherit;
}

.calculator-panel button {
    font: inherit;
    font-weight: 650;
    border: 0;
    cursor: pointer;
}

.calculator-panel button:disabled {
    cursor: default;
    opacity: .55;
}

.calculator-panel :is(button, input, select):focus-visible {
    outline: 3px solid var(--blue);
    outline-offset: 3px;
}

.calculator-panel [aria-invalid="true"] {
    border: 2px solid var(--notice);
}

.calculator-panel .form-group {
    border-top: 1px solid var(--line);
    padding-top: 1.25rem;
    margin-top: 1.25rem;
}

.plate-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
    align-items: end;
    gap: .75rem;
    margin-bottom: .8rem;
}

.calculator-panel .plate-row button {
    padding-inline: .65rem;
}

.calculator-panel .actions {
    margin-top: 1.25rem;
}

.calculator-panel .result-status:not(:empty) {
    margin-top: 1rem;
    padding: .75rem 1rem;
    background: var(--blue-soft);
    border-radius: 8px;
}

.calculator-result {
    margin-top: 1.5rem;
    border-top: 1px solid var(--line);
    padding-top: 1.25rem;
}

.plate-diagram:not([hidden]) {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .45rem;
    padding: .85rem;
    border-radius: 12px;
    background: var(--bg);
}

.plate-stack {
    display: inline-grid;
    place-items: center;
    min-height: 46px;
    padding: .4rem .65rem;
    border: 2px solid var(--blue);
    border-radius: 12px / 5px;
    background: var(--blue-soft);
    color: var(--ink);
    font-size: .83rem;
    font-weight: 650;
}

.plate-stack-medium {
    min-height: 60px;
}

.plate-stack-large {
    min-height: 74px;
}

.calculator-guide {
    padding-bottom: 1.25rem;
}

.calculator-guide .reading {
    padding-bottom: 0;
}

.calculator-guide p:last-child {
    margin-bottom: 0;
}

.tool-promo {
    margin: 0 0 3rem;
}

.calculator-panel + .tool-promo {
    margin-top: 1.25rem;
}

@media (max-width: 540px) {
    .calculator-panel .field-grid {
        grid-template-columns: 1fr;
    }

    .plate-row {
        gap: .45rem;
    }
}