.cidr-calculator-container {
    gap: 16px;
}

.cidr-lead {
    margin: 0;
    color: #64748b;
    font-size: 0.95em;
    line-height: 1.5;
}

.cidr-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: start;
}

.cidr-panel {
    background: #fff;
    border: 1px solid #dee2e6;
    border-radius: 12px;
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-width: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.cidr-panel h2 {
    margin: 0;
    font-size: 1.15em;
    color: #1971c2;
}

.cidr-panel .panel-desc {
    margin: 0;
    color: #64748b;
    font-size: 0.88em;
    line-height: 1.45;
}

.cidr-panel .input-group {
    margin-bottom: 0;
}

.cidr-panel .input-group label {
    font-weight: 600;
    color: #334155;
    font-size: 0.9em;
}

.input-row {
    display: flex;
    gap: 8px;
    align-items: stretch;
}

.input-row input {
    flex: 1;
    min-width: 0;
}

.cidr-panel textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    font-size: 14px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    line-height: 1.45;
    resize: vertical;
    min-height: 140px;
}

.btn-secondary {
    background-color: #64748b;
}

.btn-secondary:hover {
    background-color: #475569;
}

.cidr-panel .result {
    margin-top: 4px;
}

.cidr-panel .result h3 {
    margin: 0 0 8px 0;
    font-size: 0.95em;
    color: #334155;
}

.cidr-panel .result pre {
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.85em;
    line-height: 1.5;
    max-height: 360px;
    overflow: auto;
}

@media (max-width: 900px) {
    .cidr-panels {
        grid-template-columns: 1fr;
    }
}