.advanced-product-filter {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-card);
}
.advanced-filter-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    align-items: end;
}
.filter-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.filter-field label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
}
.filter-field input,
.filter-field select {
    padding: 0.75rem 1rem;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    color: var(--gray-700);
    transition: all var(--transition-fast);
}
.filter-field input:focus,
.filter-field select:focus {
    outline: none;
    background: var(--white);
    border-color: #007fff;
    box-shadow: 0 0 0 3px rgba(0, 127, 255, 0.1);
}
.filter-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}
.filter-submit {
    padding: 0.75rem 2rem;
    background: #007fff;
    color: var(--white);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.filter-submit:hover {
    background: #0066cc;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 127, 255, 0.3);
}
.filter-reset {
    padding: 0.75rem 1.5rem;
    background: transparent;
    color: var(--gray-600);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.filter-reset:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}
.filter-count {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
}
.filter-results {
    position: relative;
    min-height: 400px;
}
.filter-loading {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: var(--radius-lg);
}
.filter-loading.active {
    display: flex;
}
.filter-loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--gray-200);
    border-top-color: #007fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
.filter-error {
    padding: 2rem;
    text-align: center;
    color: var(--error);
    background: var(--error-50);
    border-radius: var(--radius-lg);
}
@media (max-width: 768px) {
    .advanced-filter-form {
        grid-template-columns: 1fr;
    }
    .filter-actions {
        flex-direction: column;
        width: 100%;
    }
    .filter-submit,
    .filter-reset {
        width: 100%;
    }
}
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}