:root {
    --input-border: #e9ecef;
    --input-focus: #4a90e2;
    --input-radius: 8px;
    --transition: all 0.3s ease;
}

.input-group {
    position: relative;
    display: flex;
    align-items: stretch;
    width: 100%;
    gap: 0;
    border-radius: var(--input-radius);
    border: 2px solid var(--input-border);
    transition: var(--transition);
}

.input-group:focus-within {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 0.25rem rgba(74, 144, 226, 0.25);
}

.input-group select {
    flex: 0 0 30%;
    border: none;
    padding: 0.75rem;
    background-color: #f8f9fa;
    border-radius: var(--input-radius) 0 0 var(--input-radius);
    font-weight: 500;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1em;
    padding-right: 2.5rem;
}

.input-group input {
    flex: 1;
    border: none;
    padding: 0.75rem;
    border-radius: 0 var(--input-radius) var(--input-radius) 0;
    border-left: 2px solid var(--input-border);
}

.input-group select:focus,
.input-group input:focus {
    outline: none;
}

/* Стили для опций выбора страны */
.country-code-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
}

/* Стили для флагов стран */
.country-flag {
    width: 1.5rem;
    height: 1rem;
    object-fit: cover;
    border-radius: 2px;
}

/* Мобильная оптимизация */
@media (max-width: 576px) {
    .input-group select {
        flex: 0 0 35%;
        font-size: 0.9rem;
    }

    .input-group input {
        font-size: 0.9rem;
    }
}