/* ===== АДАПТАЦИЯ ПОД МОБИЛЬНЫЕ ===== */
@media (max-width: 768px) {
    .calc-grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .referral-main {
        grid-template-columns: 1fr;
    }
    
    .input-row {
        flex-direction: column;
        align-items: stretch;
        padding: 15px;
    }
    
    .input-row label {
        min-width: auto;
    }
    
    .input-row input {
        text-align: left;
    }
}