.button-group {
    display: flex;
    justify-content: center;
    gap: 0.625rem;
    margin-bottom: 1.25rem;
}

.button-group button {
    padding: 0.625rem 1.25rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1rem;
}

.button-group button:hover {
    background: #5a35a8;
}

.validation-section {
    margin-top: 1.25rem;
    display: none; /* Initially hidden */
}

.validation-section.active {
    display: block; /* Show when active */
}

.country-display {
    margin-bottom: 1.25rem;
}

.country-name {
    font-size: 1.125rem;
    font-weight: bold;
    color: var(--accent);
}

.radio-group {
    display: none; /* Initially hidden */
    flex-direction: column;
    gap: 0.625rem;
    align-items: center;
    margin-top: 5rem;
}

.validation-section.active .radio-group {
    display: flex; /* Show when validation section is active */
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.modern-btn {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    display: none; /* Initially hidden */
}

.modern-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

@media (max-width: 1440px) {
    .button-group {
        gap: 0.6rem;
        margin-bottom: 1.125rem;
    }
    .button-group button {
        padding: 0.6rem 1.1875rem;
        font-size: 0.95rem;
    }
    .validation-section {
        margin-top: 1.125rem;
    }
    .country-display {
        margin-bottom: 1.125rem;
    }
    .country-name {
        font-size: 1.0625rem;
    }
    .radio-group {
        gap: 0.6rem;
    }
    .radio-option {
        gap: 0.6rem;
    }
}

@media (max-width: 1024px) {
    .button-group {
        gap: 0.575rem;
        margin-bottom: 1rem;
    }
    .button-group button {
        padding: 0.575rem 1.125rem;
        font-size: 0.9rem;
    }
    .validation-section {
        margin-top: 1rem;
    }
    .country-display {
        margin-bottom: 1rem;
    }
    .country-name {
        font-size: 1rem;
    }
    .radio-group {
        gap: 0.575rem;
    }
    .radio-option {
        gap: 0.575rem;
    }
}

@media (max-width: 768px) {
    .button-group {
        gap: 0.55rem;
        margin-bottom: 0.875rem;
        flex-direction: column;
        align-items: center;
    }
    .button-group button {
        padding: 0.55rem 1.0625rem;
        font-size: 0.85rem;
    }
    .validation-section {
        margin-top: 0.875rem;
    }
    .country-display {
        margin-bottom: 0.875rem;
    }
    .country-name {
        font-size: 0.9375rem;
    }
    .radio-group {
        gap: 0.55rem;
    }
    .radio-option {
        gap: 0.55rem;
    }
}

@media (max-width: 480px) {
    .button-group {
        gap: 0.525rem;
        margin-bottom: 0.75rem;
    }
    .button-group button {
        padding: 0.525rem 1rem;
        font-size: 0.8rem;
    }
    .validation-section {
        margin-top: 0.75rem;
    }
    .country-display {
        margin-bottom: 0.75rem;
    }
    .country-name {
        font-size: 0.875rem;
    }
    .radio-group {
        gap: 0.525rem;
    }
    .radio-option {
        gap: 0.525rem;
    }
}

@media (max-width: 375px) {
    .button-group {
        gap: 0.5rem;
        margin-bottom: 0.625rem;
    }
    .button-group button {
        padding: 0.5rem 0.9375rem;
        font-size: 0.75rem;
    }
    .validation-section {
        margin-top: 0.625rem;
    }
    .country-display {
        margin-bottom: 0.625rem;
    }
    .country-name {
        font-size: 0.8125rem;
    }
    .radio-group {
        gap: 0.5rem;
    }
    .radio-option {
        gap: 0.5rem;
    }
}