.form-validation-challenge {
    margin-top: 1.5rem;
    padding: 1.4rem 1.5rem;
    border-radius: 1.25rem;
    border: 1px solid rgba(37, 99, 235, 0.16);
    background: #ffffff;
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
    max-width: 100%;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.form-validation-challenge.verified {
    border-color: rgba(34, 197, 94, 0.35);
    box-shadow: 0 18px 55px rgba(34, 197, 94, 0.12);
}

.form-validation-challenge.loading {
    opacity: 0.95;
}

.form-validation-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-validation-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.form-validation-icon {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: rgba(37, 99, 235, 0.12);
    color: #2563eb;
}

.form-validation-title {
    font-size: 1rem;
    font-weight: 700;
    color: #0f172a;
    margin: 0;
}

.form-validation-subtitle {
    font-size: 0.92rem;
    color: #475569;
    margin-top: 0.25rem;
    line-height: 1.4;
}

.form-validation-refresh {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 110px;
    border: 1px solid rgba(37, 99, 235, 0.18);
    background: #ffffff;
    color: #2563eb;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.92rem;
    padding: 0.7rem 1rem;
    border-radius: 999px;
    transition: all 0.18s ease;
}

.form-validation-refresh:hover {
    background: rgba(37, 99, 235, 0.06);
}

.form-validation-refresh:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.form-validation-body {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    padding: 1rem 0;
    border-top: 1px solid rgba(15, 23, 42, 0.06);
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.form-validation-checkbox-label {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
    user-select: none;
    font-size: 0.98rem;
    font-weight: 700;
    color: #0f172a;
    padding: 0.95rem 1rem;
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: 1rem;
    background: #f8fbff;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.form-validation-checkbox-label:hover {
    border-color: rgba(37, 99, 235, 0.28);
}

.form-validation-checkbox {
    width: 1px;
    height: 1px;
    opacity: 0;
    position: absolute;
    pointer-events: none;
}

.form-validation-checkbox-custom {
    width: 1.45rem;
    height: 1.45rem;
    min-width: 1.45rem;
    border: 2px solid rgba(15, 23, 42, 0.14);
    border-radius: 0.45rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.2s ease, background-color 0.2s ease;
    background: #ffffff;
}

.form-validation-checkbox:checked + .form-validation-checkbox-custom {
    border-color: #16a34a;
    background: #16a34a;
}

.form-validation-checkbox:checked + .form-validation-checkbox-custom::before {
    content: '';
    width: 0.55rem;
    height: 0.9rem;
    border: solid #ffffff;
    border-width: 0 0.2rem 0.2rem 0;
    transform: rotate(45deg);
}

.form-validation-checkbox:disabled + .form-validation-checkbox-custom {
    opacity: 0.75;
}

.form-validation-checkbox-text {
    color: #0f172a;
}

.form-validation-state {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    flex: 1;
    min-width: 200px;
}

.form-validation-status {
    font-size: 0.95rem;
    color: #475569;
    min-height: 1.3rem;
}

.form-validation-status-success {
    color: #16a34a;
}

.form-validation-status-error {
    color: #b91c1c;
}

.form-validation-error {
    display: none;
    color: #b91c1c;
    font-size: 0.92rem;
    line-height: 1.4;
}

.form-validation-note {
    margin-top: 1rem;
    color: #475569;
    font-size: 0.9rem;
}

@media (max-width: 640px) {
    .form-validation-top {
        flex-direction: column;
        align-items: stretch;
    }
    .form-validation-body {
        flex-direction: column;
        align-items: stretch;
    }
    .form-validation-checkbox-label {
        width: 100%;
    }
}