/* ==================== 颜色变量 ==================== */
:root {
    --primary-red: #e60012;
    --primary-red-dark: #c41230;
}

/* ==================== PC端导航栏 ==================== */
.main-nav {
    background-color: #D81617;
    padding: 0;
}

.main-nav .container {
    padding: 0;
}

.main-nav .navbar-nav {
    width: 100%;
    display: flex;
    justify-content: space-between;
}

.main-nav .nav-item {
    flex: 1;
    text-align: center;
    position: relative;
}

.main-nav .nav-link {
    color: #fff !important;
    font-size: 15px;
    padding: 15px 20px 12px !important;
    transition: all 0.3s ease;
    position: relative;
    border-bottom: 3px solid transparent;
}

.main-nav .nav-link.active,
.main-nav .nav-item.nav-item-hover .nav-link {
    background-color: rgba(255, 255, 255, 0.1);
    border-bottom-color: #fff;
}

/* PC端二级菜单 */
.main-nav .dropdown-menu {
    border-radius: 0;
    border: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    margin-top: 0;
    padding: 0;
    width: 100%;
    min-width: auto;
    display: block;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.25s ease;
}

/* PC端悬停显示下拉菜单 */
.main-nav .dropdown.show .dropdown-menu,
.main-nav .dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.main-nav .dropdown-item {
    padding: 12px 20px;
    font-size: 14px;
    color: #333;
    border-bottom: 1px solid #f0f0f0;
    transition: all 0.2s ease;
    word-wrap: break-word;
    white-space: normal;
}

.main-nav .dropdown-item:last-child {
    border-bottom: none;
}

.main-nav .dropdown-item:hover {
    background-color: var(--primary-red);
    color: #fff;
}

.main-nav .dropdown-toggle::after {
    vertical-align: middle;
    margin-left: 6px;
}

/* ==================== 移动端导航栏 ==================== */
@media (max-width: 991px) {
    /* 移动端导航白色背景 */
    .main-nav {
        background-color: #fff;
        border-bottom: 1px solid #e0e0e0;
    }
    
    .main-nav .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0 15px;
    }
    
    /* 移动端Logo */
    .mobile-logo {
        display: flex !important;
        align-items: center;
        gap: 8px;
        padding: 10px 0;
        order: 1;
    }
    
    .mobile-logo img {
        height: 36px;
    }
    
    .mobile-logo-text {
        font-size: 16px;
        font-weight: bold;
        color: #333;
    }
    
    /* 移动端语言切换 */
    .mobile-lang-switch {
        order: 2;
        margin-right: 0;
    }
    
    /* 移动端语言切换（带间距） */
    .mobile-lang-switch-with-margin {
    }
    
    /* 导航按钮 */
    .navbar-toggler {
        order: 3;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background-color: #e60012;
        border: none;
        padding: 0;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .navbar-toggler-icon {
        width: 20px;
        height: 20px;
        background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    
    .navbar-collapse {
        order: 3;
        width: 100%;
        background-color: #fff;
        border-top: 1px solid #f0f0f0;
    }
    
    .main-nav .nav-item {
        text-align: left;
        border-bottom: 1px solid #e8e8e8;
    }
    
    .main-nav .nav-link {
        color: #333 !important;
        padding: 14px 20px !important;
        font-size: 15px;
        border-bottom: none !important;
    }
    
    .main-nav .nav-link.active,
    .main-nav .nav-item.nav-item-hover .nav-link {
        background-color: #f0f0f0 !important;
        color: var(--primary-red) !important;
        border-bottom: none !important;
    }
    
    /* 移动端二级菜单 */
    .main-nav .dropdown-menu {
        background-color: #f0f0f0;
        border: none;
        box-shadow: none;
        border-radius: 0;
        padding: 0;
        margin: 0;
        display: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        transition: none;
    }
    
    .main-nav .dropdown.show .dropdown-menu {
        display: block;
    }
    
    .main-nav .dropdown-item {
        padding: 12px 35px;
        border-bottom: 1px solid #e0e0e0;
        color: #555;
    }
    
    .main-nav .dropdown-item:hover {
        background-color: #e8e8e8;
        color: var(--primary-red);
    }
    
    .main-nav .dropdown-toggle::after {
        float: right;
        margin-top: 8px;
    }
}

/* 三级导航样式 */
.mega-dropdown {
    position: relative;
}

.mega-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 1000px;
    background-color: #fff;
    border: 1px solid #e0e0e0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border-radius: 0;
    margin-top: 0;
    padding: 20px;
    display: none;
    z-index: 1000;
}

.mega-dropdown:hover .mega-dropdown-menu {
    display: block;
}

.mega-dropdown-content {
    display: flex;
}

.mega-nav-line {
    width: 100%;
}

.mega-nav-content {
    display: flex;
    border-bottom: 1px solid #e0e0e0;
    padding: 15px 0;
}

.mega-nav-content:last-child {
    border-bottom: none;
}

.mega-nav-left {
    flex: 0 0 150px;
    border-right: 1px solid #e0e0e0;
    padding-right: 20px;
}

.mega-nav-title {
    display: block;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.mega-nav-title:hover {
    color: #D81617;
}

.mega-nav-right {
    flex: 1;
    padding-left: 20px;
}

.mega-nav-list {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: 20px;
}

.mega-nav-name {
    color: #666;
    text-decoration: none;
    font-size: 13px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.mega-nav-name:hover {
    color: #D81617;
}

/* 手机端导航栏 */
@media (max-width: 767px) {
    .main-nav .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .mobile-logo img {
        height: 32px;
    }
    
    .mobile-logo-text {
        font-size: 14px;
    }
    
    .main-nav .navbar-toggler {
        width: auto;
        height: 36px;
        padding: 0 20px;
        display: flex;
        align-items: center;
        justify-content: center;
        background-color: #D81617;
        border: none;
        border-radius: 18px;
        transition: all 0.3s ease;
        flex-direction: row;
    }
    
    .main-nav .navbar-toggler:hover {
        background-color: #b91c1c;
    }
    
    .main-nav .navbar-toggler-icon {
        width: auto;
        height: auto;
        font-size: 14px;
        color: #fff;
        font-weight: 500;
        background-image: none !important;
        display: flex;
        align-items: center;
        gap: 6px;
        line-height: 1;
    }
    
    .main-nav .navbar-toggler-icon::after {
        content: '';
        width: 14px;
        height: 12px;
        background-image: 
            linear-gradient(to bottom, #fff 2px, transparent 2px),
            linear-gradient(to bottom, #fff 2px, transparent 2px),
            linear-gradient(to bottom, #fff 2px, transparent 2px);
        background-repeat: no-repeat;
        background-size: 100% 100%;
        background-position: 
            0 0,
            0 5px,
            0 10px;
    }
    
    .main-nav .nav-link {
        padding: 12px 18px !important;
        font-size: 14px;
        border-bottom: none !important;
    }
    
    .main-nav .dropdown-item {
        padding: 10px 30px;
        font-size: 13px;
    }
    
    /* 移动端三级导航适配 */
    .mega-dropdown-menu {
        position: static;
        width: 100%;
        border: none;
        box-shadow: none;
        padding: 0;
        display: none !important;
    }
    
    .mega-dropdown.show .mega-dropdown-menu {
        display: block !important;
    }
    
    .mega-dropdown-content {
        flex-direction: column;
    }
    
    .mega-nav-content {
        flex-direction: column;
        padding: 10px 20px;
        border-bottom: 1px solid #e0e0e0;
    }
    
    .mega-nav-left {
        flex: 100%;
        border-right: none;
        padding-right: 0;
        margin-bottom: 10px;
    }
    
    .mega-nav-title {
        padding: 8px 0;
    }
    
    .mega-nav-right {
        flex: 100%;
        padding-left: 0;
    }
    
    .mega-nav-list {
        gap: 15px;
    }
    
    .mega-nav-name {
        font-size: 12px;
    }
}