/* ===== 导航栏样式 ===== */
.main-nav {
    flex: 1;
    margin: 0 20px;
}

.nav-menu {
    display: flex;
    list-style: none;
    justify-content: center;
    gap: 5px;
    margin: 0;
    padding: 0;
}

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

.nav-menu > li > a {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    color: #333;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    border-radius: 40px;
    transition: all 0.3s ease;
    background: transparent;
    white-space: nowrap;
}

.nav-menu > li > a i {
    margin-left: 6px;
    font-size: 14px;
    transition: transform 0.3s ease;
}

.nav-menu > li:hover > a {
    color: #0a5cf5;
    background: rgba(10, 92, 245, 0.08);
}

.nav-menu > li:hover > a i {
    transform: rotate(180deg);
}

/* ===== 下拉菜单 ===== */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 220px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    padding: 12px 0;
    border: 1px solid rgba(0,0,0,0.05);
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu li {
    display: block;
}

.dropdown-menu li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    color: #666;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.dropdown-menu li a i {
    font-size: 12px;
    color: #0a5cf5;
    width: 16px;
}

.dropdown-menu li a:hover {
    background: rgba(10, 92, 245, 0.05);
    color: #0a5cf5;
    padding-left: 25px;
}

/* ===== Mega菜单 ===== */
.mega-dropdown {
    position: static;
}

.mega-menu {
    position: absolute;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    width: 100vw;
    max-width: 1200px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.2);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    border: 1px solid rgba(0,0,0,0.05);
    margin-top: 10px;
}

.mega-dropdown:hover .mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.mega-menu-container {
    padding: 30px;
}

.mega-menu-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.mega-menu-col {
    border-right: 1px solid #eee;
    padding-right: 20px;
}

.mega-menu-col:last-child {
    border-right: none;
}

.mega-menu-col h4 {
    font-size: 16px;
    font-weight: 700;
    color: #333;
    margin-bottom: 15px;
    padding-bottom: 8px;
    border-bottom: 2px solid #0a5cf5;
}

.mega-menu-col h4 a {
    color: #333;
    text-decoration: none;
}

.mega-menu-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mega-menu-col ul li {
    margin-bottom: 10px;
}

.mega-menu-col ul li a {
    color: #666;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    display: block;
}

.mega-menu-col ul li a:hover {
    color: #0a5cf5;
    transform: translateX(5px);
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.menu-toggle span {
    width: 100%;
    height: 3px;
    background: #333;
    transition: all 0.3s ease;
    border-radius: 3px;
}

@media (max-width: 992px) {
    .menu-toggle {
        display: flex;
    }
    
    .main-nav {
        position: fixed;
        top: 90px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 90px);
        background: white;
        transition: left 0.3s ease;
        overflow-y: auto;
        z-index: 999;
        margin: 0;
    }
    
    .main-nav.active {
        left: 0;
    }
    
    .nav-menu {
        flex-direction: column;
        padding: 20px;
    }
    
    .nav-menu > li > a {
        justify-content: space-between;
    }
    
    .dropdown-menu,
    .mega-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        margin-top: 10px;
        margin-bottom: 10px;
        display: none;
        width: 100%;
    }
    
    .dropdown.open .dropdown-menu,
    .mega-dropdown.open .mega-menu {
        display: block;
    }
}