.irhvac-euler {
    --euler-border: #d7dde5;
    --euler-text: #1e293b;
    --euler-muted: #64748b;
    --euler-primary: #0f5d7a;
    --euler-primary-hover: #0b4a61;
    --euler-bg: #ffffff;
    --euler-soft: #f5f8fb;
    --euler-success: #0f7b5c;
    --euler-error: #a61b1b;
    color: var(--euler-text);
    font: inherit;
    max-width: 900px;
    margin: 1.25rem auto;
}

.irhvac-euler *,
.irhvac-euler *::before,
.irhvac-euler *::after {
    box-sizing: border-box;
}

.irhvac-euler__form {
    background: var(--euler-bg);
    border: 1px solid var(--euler-border);
    border-radius: 14px;
    padding: 1.25rem;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.irhvac-euler__intro {
    margin: 0 0 1rem;
    padding: 0.75rem 0.9rem;
    background: var(--euler-soft);
    border-radius: 9px;
    color: var(--euler-muted);
}

.irhvac-euler__intro p {
    margin: 0;
}

.irhvac-euler__grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.irhvac-euler__field label {
    display: block;
    margin-bottom: 0.42rem;
    font-weight: 700;
}

.irhvac-euler__input-group {
    display: flex;
    align-items: stretch;
    min-width: 0;
}

.irhvac-euler__input-group input,
.irhvac-euler__input-group select {
    min-width: 0;
    height: 44px;
    border: 1px solid var(--euler-border);
    background: #fff;
    color: var(--euler-text);
    font: inherit;
}

.irhvac-euler__input-group input {
    width: 100%;
    padding: 0 0.75rem;
    border-radius: 8px 0 0 8px;
    direction: ltr;
    text-align: left;
}

.irhvac-euler__input-group select,
.irhvac-euler__unit {
    flex: 0 0 auto;
    min-width: 76px;
    padding: 0 0.65rem;
    border-right: 0;
    border-radius: 0 8px 8px 0;
}

.irhvac-euler__unit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 44px;
    border: 1px solid var(--euler-border);
    border-right: 0;
    background: var(--euler-soft);
    color: var(--euler-muted);
    white-space: nowrap;
}

.irhvac-euler__input-group input:focus,
.irhvac-euler__input-group select:focus {
    outline: 2px solid rgba(15, 93, 122, 0.22);
    outline-offset: 1px;
    border-color: var(--euler-primary);
    z-index: 1;
}

.irhvac-euler__field.is-calculated .irhvac-euler__input-group input {
    border-color: var(--euler-success);
    background: #effaf6;
}

.irhvac-euler__actions {
    display: flex;
    gap: 0.65rem;
    margin-top: 1.1rem;
}

.irhvac-euler__button {
    min-height: 42px;
    border-radius: 8px;
    padding: 0.65rem 1.15rem;
    border: 1px solid transparent;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}

.irhvac-euler__button--primary {
    background: var(--euler-primary);
    color: #fff;
}

.irhvac-euler__button--primary:hover {
    background: var(--euler-primary-hover);
}

.irhvac-euler__button--secondary {
    background: #fff;
    color: var(--euler-text);
    border-color: var(--euler-border);
}

.irhvac-euler__button--secondary:hover {
    background: var(--euler-soft);
}

.irhvac-euler__message,
.irhvac-euler__result {
    margin-top: 1rem;
    border-radius: 12px;
    padding: 1rem;
}

.irhvac-euler__message--error {
    border: 1px solid #efb4b4;
    background: #fff2f2;
    color: var(--euler-error);
}

.irhvac-euler__result {
    border: 1px solid #acd9c8;
    background: #f4fbf8;
}

.irhvac-euler__result-main {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    padding-bottom: 0.85rem;
    margin-bottom: 0.85rem;
    border-bottom: 1px solid #cfe7de;
}

.irhvac-euler__result-label {
    color: var(--euler-muted);
}

.irhvac-euler__result-main strong {
    font-size: clamp(1.2rem, 2.5vw, 1.65rem);
    color: var(--euler-success);
}

.irhvac-euler__result-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
    margin: 0;
}

.irhvac-euler__result-grid div {
    min-width: 0;
}

.irhvac-euler__result-grid dt {
    color: var(--euler-muted);
    font-size: 0.9rem;
}

.irhvac-euler__result-grid dd {
    margin: 0.2rem 0 0;
    font-weight: 700;
    overflow-wrap: anywhere;
}

.irhvac-euler__help {
    margin-top: 0.9rem;
    border: 1px solid var(--euler-border);
    border-radius: 10px;
    background: #fff;
}

.irhvac-euler__help summary {
    cursor: pointer;
    padding: 0.8rem 0.9rem;
    font-weight: 700;
}

.irhvac-euler__help > div {
    padding: 0 0.9rem 0.9rem;
    color: var(--euler-muted);
}

.irhvac-euler__help p {
    margin: 0.45rem 0 0;
}

.irhvac-euler__author {
    margin: 0.8rem 0 0;
    color: var(--euler-muted);
    font-size: 0.9rem;
}

@media (max-width: 700px) {
    .irhvac-euler__grid,
    .irhvac-euler__result-grid {
        grid-template-columns: 1fr;
    }

    .irhvac-euler__form {
        padding: 1rem;
    }

    .irhvac-euler__result-main {
        align-items: flex-start;
        flex-direction: column;
    }

    .irhvac-euler__actions {
        flex-direction: column;
    }

    .irhvac-euler__button {
        width: 100%;
    }
}