.fullwidth-dropdown {
    position: fixed;
    top: 108px; /* 导航栏高度 + top_wrap高度 */
    left: 0;
    width: 100%;
    background: #fff;
    border-top: 1px solid #e0e0e0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    z-index: 1000;
    display: none;
    padding: 36px 0;
}

.fullwidth-dropdown.show {
    display: block;
}

.dropdown-container {
    margin: 0 auto;
    padding: 0 20px;
}

/* 响应式容器宽度设置 */
@media (min-width: 1024px) {
    .dropdown-container {
        width: 1000px;
    }
}

@media (min-width: 1200px) {
    .dropdown-container {
        width: 1180px;
    }
}

@media (min-width: 1280px) {
    .dropdown-container {
        width: 1260px;
    }
}

@media (min-width: 1440px) {
    .dropdown-container {
        width: 1410px;
    }
}

.dropdown-content {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.dropdown-section {
    flex: 1;
    min-width: 180px;
    /* max-width: 250px; */
    max-width: 500px;
}

.dropdown-section-title {
    font-size: 17px;
    font-weight: 700;
    color: #3f3f3f;
    margin-bottom: 10px;
    /* letter-spacing: 0.5px; */
    /* height: 45px; */
    /* font-size: 1.7rem; */
    line-height: 18px;
    /* line-height: 2rem; */
    border-bottom: 1px solid #d0d3d4;
    /* margin-bottom: 10px; */
    padding: 0 0 10px 0;
    font-family: Arial, sans-serif;
}

/* 下拉菜单标题悬停效果 */
.dropdown-section-title:hover {
    color: #e50012;
}

.dropdown-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.dropdown-section ul li {
    margin-bottom: 8px;
}

.dropdown-section ul li a {
    color: #3f3f3f;
    text-decoration: none;
    /* font-size: 1.4rem; */
    font-size: 14px;
    /* line-height: 1.8rem; */
    line-height: 18px;
    display: block;
    padding: 6px 0;
    transition: all 0.2s ease;
    font-weight: 400;
    font-family: Arial, sans-serif;
}

.dropdown-section ul li a:hover {
    color: #e50012 !important;
}

/* 菜单描述文本样式 */
.menu-description {
    margin-bottom: 14px;
    font-size: 14px;
    /* font-size: 1.4rem; */
    line-height: 18px;
    /* line-height: 2rem; */
    color: #6f6e6e;
    font-family: Arial, sans-serif;
    font-weight: normal !important;
}

/* 主导航hover效果 */
.nav-bar .main-nav > li:hover > a {
    color: #000;
    text-decoration: underline;
}

/* 显示下拉菜单的触发 */
.nav-bar .main-nav > li:hover .fullwidth-dropdown {
    display: block;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .dropdown-content {
        flex-direction: column;
        gap: 20px;
    }
    
    .dropdown-section {
        min-width: auto;
    }
    
    .fullwidth-dropdown {
        top: 68px; /* 移动端导航栏高度 */
        padding: 20px 0;
    }
}

/* 下拉菜单背景遮罩 */
.dropdown-backdrop {
    position: fixed;
    top: 108px;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0,0,0,0.1);
    z-index: 999;
    display: none;
}

.dropdown-backdrop.show {
    display: block;
}

/* 动画效果 */
.fullwidth-dropdown {
    transform: translateY(-10px);
    opacity: 0;
    transition: all 0.3s ease;
}

.fullwidth-dropdown.show {
    transform: translateY(0);
    opacity: 1;
}

/* 关闭按钮 */
.dropdown-close {
    position: absolute;
    top: 15px;
    right: 20px;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    font-size: 20px;
    color: #999;
    cursor: pointer;
    display: none;
}

.dropdown-close:hover {
    color: #e50012;
}

@media (max-width: 768px) {
    .dropdown-close {
        display: block;
    }
}