.iuc-wrap {
    --iuc-red: #c90000;
    --iuc-ink: #111827;
    --iuc-muted: #526071;
    --iuc-line: #d9dee7;
    --iuc-panel: #ffffff;
    --iuc-soft: #f5f7fa;
    --iuc-radius: 8px;

    max-width: 820px;
    margin: 0 auto;
    padding: 24px;
    border-top: 4px solid var(--iuc-red);
    background: var(--iuc-soft);
    color: var(--iuc-ink);
    font-family: inherit;
}

.iuc-wrap *,
.iuc-wrap *::before,
.iuc-wrap *::after {
    box-sizing: border-box;
}

.iuc-header {
    margin: 0 0 20px;
}

.iuc-eyebrow {
    margin: 0 0 4px;
    color: var(--iuc-red);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.iuc-header h2 {
    margin: 0;
    color: var(--iuc-ink);
    font-size: clamp(1.6rem, 3vw, 2.15rem);
    line-height: 1.15;
}

.iuc-header p:not(.iuc-eyebrow) {
    margin: 8px 0 0;
    color: var(--iuc-muted);
    font-size: 0.98rem;
}

.iuc-grid {
    display: grid;
    gap: 12px;
}

.iuc-card {
    padding: 16px;
    border: 1px solid var(--iuc-line);
    border-radius: var(--iuc-radius);
    background: var(--iuc-panel);
}

.iuc-card h3 {
    margin: 0 0 14px;
    color: var(--iuc-ink);
    font-size: 1rem;
    line-height: 1.25;
}

.iuc-fields {
    display: grid;
    grid-template-columns: minmax(130px, 1.4fr) minmax(100px, 1fr) minmax(100px, 1fr) minmax(130px, 1.3fr);
    gap: 12px;
    align-items: start;
}

.iuc-fields label {
    display: grid;
    gap: 6px;
    margin: 0;
    color: var(--iuc-muted);
    font-size: 0.78rem;
    font-weight: 700;
}

.iuc-fields input,
.iuc-fields select,
.iuc-result {
    width: 100%;
    min-height: 42px;
    border: 1px solid #b8c0cc;
    border-radius: 6px;
    background: #fff;
    color: var(--iuc-ink);
    font: inherit;
    font-size: 0.95rem;
}

.iuc-fields input,
.iuc-fields select {
    padding: 8px 10px;
}

.iuc-fields input:focus,
.iuc-fields select:focus {
    border-color: var(--iuc-red);
    outline: 2px solid rgba(201, 0, 0, 0.16);
    outline-offset: 1px;
}

.iuc-result {
    display: flex;
    align-items: center;
    overflow-wrap: anywhere;
    padding: 8px 10px;
    background: #f9fafb;
    font-weight: 700;
}

.iuc-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-top: 18px;
}

.iuc-button {
    min-width: 112px;
    min-height: 42px;
    padding: 10px 18px;
    border: 0;
    border-radius: 6px;
    background: #4b5563;
    color: #fff;
    cursor: pointer;
    font: inherit;
    font-size: 0.92rem;
    font-weight: 700;
    line-height: 1;
    transition: background-color 160ms ease, transform 160ms ease;
}

.iuc-button:hover,
.iuc-button:focus-visible {
    background: #374151;
}

.iuc-button:active {
    transform: translateY(1px);
}

.iuc-convert {
    background: var(--iuc-red);
}

.iuc-convert:hover,
.iuc-convert:focus-visible {
    background: #a80000;
}

@media (max-width: 720px) {
    .iuc-wrap {
        padding: 18px;
    }

    .iuc-fields {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 480px) {
    .iuc-wrap {
        padding: 16px;
    }

    .iuc-fields {
        grid-template-columns: 1fr;
    }

    .iuc-button {
        width: 100%;
    }
}