.container-bottom {
    width: 100%;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
}

.accordion-item {
    margin-bottom: 12px;
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    overflow: hidden;
    width: 100%;
    box-sizing: border-box;
    background: white;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
}

.accordion-item:hover {
    border-color: #d0d0d0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.accordion-button {
    width: 100%;
    padding: 16px 20px;
    text-align: left;
    background: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-sizing: border-box;
    position: relative;
    overflow: hidden;
}

.accordion-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s ease;
}

.accordion-button:hover::before {
    left: 100%;
}

.accordion-button:hover {
    background: linear-gradient(135deg, #f0f0f0 0%, #ebebeb 100%);
    transform: translateY(-1px);
}

.accordion-title {
    font-weight: 600;
    color: #2c3e50;
    flex-grow: 1;
    font-size: 16px;
    letter-spacing: 0.5px;
}

.accordion-icon {
    font-size: 18px;
    font-weight: 300;
    color: #7f8c8d;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255,255,255,0.8);
}

.accordion-button:hover .accordion-icon {
    color: #3498db;
    background: rgba(52, 152, 219, 0.1);
}

.accordion-content {
    width: 100%;
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    background: white;
    box-sizing: border-box;
}

.accordion-item.active .accordion-content {
    max-height: 600px;
    padding: 20px;
    background: linear-gradient(to bottom, #fdfdfd, #fafafa);
}

.accordion-item.active .accordion-icon {
    transform: rotate(135deg);
    color: #e74c3c;
    background: rgba(231, 76, 60, 0.1);
}

.accordion-item.active .accordion-button {
    background: linear-gradient(135deg, #e8f4fd 0%, #d4e9fa 100%);
    border-bottom: 1px solid #e1f0fa;
}

.category-list {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    box-sizing: border-box;
}

.category-link {
    display: block;
    padding: 12px 16px;
    color: #5d6d7e;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid #e0e0e0;
    box-sizing: border-box;
    background: white;
    font-size: 14px;
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.category-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: #3498db;
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.category-link:hover {
    color: #2980b9;
    background: linear-gradient(135deg, #e3f2fd 0%, #f0f8ff 100%);
    border-color: #3498db;
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.15);
}

.category-link:hover::before {
    transform: scaleY(1);
}

@media (max-width: 768px) {
    .container-bottom {
        width: 100%;
        padding: 0 8px;
    }
    
    .accordion-item {
        width: 100%;
        margin-bottom: 10px;
        border-radius: 6px;
    }
    
    .accordion-button {
        width: 100%;
        padding: 14px 16px;
    }
    
    .accordion-title {
        font-size: 15px;
    }
    
    .accordion-content {
        width: 100%;
        padding: 0 16px;
    }
    
    .accordion-item.active .accordion-content {
        padding: 16px;
    }
    
    .category-list {
        width: 100%;
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .category-link {
        padding: 10px 14px;
        font-size: 13px;
    }
}

/* 添加加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.accordion-item {
    animation: fadeInUp 0.5s ease forwards;
}

.accordion-item:nth-child(odd) {
    animation-delay: 0.1s;
}

.accordion-item:nth-child(even) {
    animation-delay: 0.2s;
}