/* 导航菜单专用样式 */

/* 主导航栏 */
.main-nav {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo img {
    height: 50px;
}

.nav-right {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    align-items: center;
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-menu > li {
    position: relative;
    z-index: 1;
}

.nav-menu > li > a {
    display: block;
    padding: 0 20px;
    height: 70px;
    line-height: 70px;
    font-size: 15px;
    color: #333;
    font-weight: 500;
    text-decoration: none;
}

.nav-menu > li > a:hover,
.nav-menu > li.active > a {
    color: #3498db;
    border-bottom: 3px solid #3498db;
}

/* 箭头 */
.arrow-down {
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 5px;
    vertical-align: middle;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid #666;
}

.has-submenu > .arrow-down {
    transition: transform 0.3s;
}

.has-submenu:hover > .arrow-down {
    transform: rotate(180deg);
}

/* 二级菜单 */
.submenu {
    display: none !important;
    position: absolute !important;
    top: 100% !important;
    left: 0 !important;
    background: #fff;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    border-radius: 0 0 8px 8px;
    min-width: 200px;
    z-index: 99999 !important;
    padding: 10px 0;
    margin: 0;
    list-style: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.has-submenu:hover > .submenu {
    display: block !important;
    animation: slideDown 0.3s ease;
}

.submenu li {
    position: relative;
}

.submenu li a {
    display: block;
    padding: 12px 25px;
    color: #555;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s;
}

.submenu li a:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding-left: 30px;
}

.submenu li:last-child a {
    border-bottom: none;
}