.interval-calc {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.ic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
    gap: 1.25rem;
}

.ic-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.ic-h {
    margin: 0;
    font-size: 1.05rem;
}

.ic-sub {
    margin: -0.4rem 0 0.25rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.ic-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.ic-field {
    flex: 1 1 8rem;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.ic-field > span {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--muted);
}

.ic-field .field {
    width: 100%;
}

.ic-dir {
    align-self: flex-start;
}

.ic-result {
    margin: 0.25rem 0 0;
    padding: 0.7rem 0.9rem;
    border-radius: 8px;
    background: var(--accent-weak);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    min-height: 1.2em;
}

.ic-result[data-tone='good'] {
    color: var(--accent-strong);
}

.ic-result[data-tone='bad'] {
    background: color-mix(in srgb, var(--bad) 14%, transparent);
    color: var(--bad);
}

.ic-result[data-tone='muted'] {
    background: var(--bg);
    color: var(--muted);
    font-weight: 500;
}