.filter-container {
    margin: 2rem 0;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.btn-filter {
    background: linear-gradient(135deg, #ffffff, #f8f9fa);
    color: #4a6cf7;
    border: 2px solid #e9ecef;
    padding: 10px 25px;
    border-radius: 30px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 600;
    margin: 0.7rem;
    font-size: 1.05rem;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn-filter:hover {
    background: linear-gradient(135deg, #f0f3ff, #e6ebff);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(74, 108, 247, 0.25);
    border-color: #4a6cf7;
}

.btn-filter.active {
    background: linear-gradient(135deg, #e6ebff, #f0f3ff);
    color: #4a6cf7;
    border-color: #4a6cf7;
    font-weight: 700;
    box-shadow: 0 4px 15px rgba(74, 108, 247, 0.2);
    transform: translateY(-2px);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .btn-filter {
        padding: 8px 20px;
        font-size: 1rem;
        margin: 0.5rem;
    }
}