.wc4dc-aprs-tool {
    max-width: 760px;
    margin: 2rem auto;
    padding: clamp(1.25rem, 3vw, 2rem);
    border: 1px solid rgba(16, 63, 91, 0.16);
    border-radius: 18px;
    background: #fff;
    box-shadow: 0 18px 45px rgba(8, 38, 58, 0.09);
    color: #16364b;
}

.wc4dc-aprs-tool__heading > span {
    color: #8a4d00;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.wc4dc-aprs-tool__heading h2 {
    margin: 0.35rem 0 0.55rem;
    color: #103f5b;
}

.wc4dc-aprs-tool__heading p,
.wc4dc-aprs-tool__help,
.wc4dc-aprs-tool__notice {
    color: #40596a;
}

.wc4dc-aprs-tool__form {
    margin-top: 1.35rem;
}

.wc4dc-aprs-tool__form > label {
    display: block;
    margin-bottom: 0.45rem;
    font-weight: 750;
}

.wc4dc-aprs-tool__controls {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.65rem;
}

.wc4dc-aprs-tool__controls input,
.wc4dc-aprs-tool__controls button {
    min-height: 46px;
    border-radius: 9px;
    font: inherit;
}

.wc4dc-aprs-tool__controls input {
    width: 100%;
    border: 1px solid #758a98;
    padding: 0.65rem 0.8rem;
    text-transform: uppercase;
}

.wc4dc-aprs-tool__controls input:focus,
.wc4dc-aprs-tool__controls button:focus-visible {
    outline: 3px solid #ffbf47;
    outline-offset: 2px;
}

.wc4dc-aprs-tool__controls input[aria-invalid="true"] {
    border-color: #a32121;
}

.wc4dc-aprs-tool__controls button {
    border: 2px solid #0d5278;
    padding: 0.65rem 1rem;
    background: #0d5278;
    color: #fff;
    cursor: pointer;
    font-weight: 750;
}

.wc4dc-aprs-tool__controls button:hover {
    background: #083e5d;
}

.wc4dc-aprs-tool__help,
.wc4dc-aprs-tool__notice {
    margin: 0.5rem 0 0;
    font-size: 0.9rem;
}

.wc4dc-aprs-tool__result {
    min-height: 1.6em;
    margin: 1rem 0 0;
    color: #0b6338;
    font-size: 1.08rem;
    font-weight: 800;
}

.wc4dc-aprs-tool__result.is-error {
    color: #8b1e1e;
}

.wc4dc-aprs-tool__notice {
    margin-top: 1.15rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(16, 63, 91, 0.13);
}

@media (max-width: 560px) {
    .wc4dc-aprs-tool__controls {
        grid-template-columns: 1fr;
    }
}