/* 顶部导航样式 */
.top-nav {
    background-color: #005baa;
    padding: 10px 0;
    position: relative;
    z-index: 1000;
}

.top-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    text-align: right;
    max-width: 1200px;
    margin: 0 auto;
}

.top-nav ul li {
    display: inline-block;
    margin-left: 20px;
    position: relative;
}

.top-nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 14px;
}

/* 下拉菜单样式 */
.product-dropdown {
    display: none;
    position: fixed;
    top: 50px;
    left: 0;
    right: 0;
    background: #005baa;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    z-index: 1000;
    padding: 30px 0;
}

.product-grid {
    max-width: 1800px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 15px;
    padding: 0 20px;
}

.product-category {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.1);
    padding: 15px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.product-category:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.2);
}

.product-category-title {
    font-size: 14px;
    font-weight: bold;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255,255,255,0.2);
}

.product-category-title a {
    color: white;
    text-decoration: none;
    display: block;
    transition: all 0.3s ease;
}

.product-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.product-list li {
    margin-bottom: 6px;
}

.product-list a {
    display: block;
    padding: 6px 8px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: 12px;
    transition: all 0.3s ease;
    border-radius: 3px;
}

.product-list a:hover {
    color: white;
    background: rgba(255,255,255,0.1);
}

/* 响应式布局 */
@media (max-width: 1800px) {
    .product-grid {
        grid-template-columns: repeat(8, 1fr);
    }
}

@media (max-width: 1600px) {
    .product-grid {
        grid-template-columns: repeat(7, 1fr);
    }
}

@media (max-width: 1400px) {
    .product-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

@media (max-width: 1200px) {
    .product-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

@media (max-width: 992px) {
    .product-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    .product-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 576px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}