/* Header Styles */
.header-wrapper {
    position: relative;
    z-index: 100;
}

.bg-menu {
    background: var(--dark-blue-grey);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header {
    padding: 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    padding: 0 20px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    width: auto;
}

/* 主导航菜单 */
.main-nav {
    display: flex;
}

.main-nav ul {
    display: flex;
    list-style: none;
    align-items: center;
    margin: 0;
    padding: 0;
}

.main-nav li {
    position: relative;
    margin: 0 20px;
}

.main-nav li > a {
    text-decoration: none;
    color: var(--white-color);
    font-weight: 500;
    font-size: 16px;
    padding: 20px 0;
    display: block;
    transition: color 0.3s ease;
}

.main-nav li:hover > a,
.main-nav li.active > a {
    color: #ff7a00;
}

/* 子菜单 */
.main-nav .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    list-style: none;
    padding: 10px 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

.main-nav li:hover .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.main-nav .sub-menu li {
    margin: 0;
    padding: 0;
    width: 100%;
    display: block;
}

.main-nav .sub-menu a {
    display: block;
    padding: 12px 20px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    white-space: nowrap;
    width: 100%;
    box-sizing: border-box;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
}

.main-nav .sub-menu a:hover {
    background: #f5f5f5;
    color: var(--primary-color);
    padding-left: 25px;
}

.main-nav .sub-menu li:last-child a {
    border-bottom: none;
}

/* 右侧区域 */
.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.search-box {
    display: flex;
    align-items: center;
    background: #f5f5f5;
    border-radius: 20px;
    padding: 5px 15px;
    transition: background-color 0.3s ease;
}

.search-box:hover {
    background: #e9ecef;
}

.search-box input {
    border: none;
    background: none;
    outline: none;
    padding: 5px;
    font-size: 14px;
    width: 150px;
}

.search-box button {
    border: none;
    background: none;
    cursor: pointer;
    font-size: 16px;
    color: #666;
}

.contact-info {
    font-size: 14px;
    color: var(--white-color);
    /* white-space: nowrap; */
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: 10px;
    color: var(--white-color);
}

/* 响应式设计 */
@media (max-width: 1400px) {
    .main-nav li {
        margin: 0 15px;
    }
    
    .main-nav li > a {
        font-size: 15px;
    }
}

@media (max-width: 1200px) {
    .header .container {
        padding: 0 15px;
    }
    
    .main-nav li {
        margin: 0 12px;
    }
    
    .main-nav li > a {
        font-size: 14px;
    }
    
    .search-box input {
        width: 100px;
    }
    
    .contact-info {
        font-size: 12px;
    }
}

@media (max-width: 1024px) {
    .main-nav li {
        margin: 0 8px;
    }
    
    .main-nav li > a {
        font-size: 13px;
    }
    
    .search-box {
        display: none;
    }
}

@media (max-width: 900px) {
    /* 隐藏桌面导航 */
    .main-nav {
        display: none;
    }
    
    .contact-info {
        display: none;
    }
    
    /* 显示移动端菜单按钮 */
    .mobile-menu-toggle {
        display: block;
    }
    
    /* 移动端菜单展开时的样式 */
    .main-nav.mobile-menu-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #000;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        padding: 10px 0;
        z-index: 999;
    }
    
    .main-nav.mobile-menu-open ul {
        flex-direction: column;
        width: 100%;
    }
    
    .main-nav.mobile-menu-open li {
        margin: 0;
        border-bottom: 1px solid #333;
        width: 100%;
    }
    
    .main-nav.mobile-menu-open li:last-child {
        border-bottom: none;
    }
    
    .main-nav.mobile-menu-open li > a {
        padding: 15px 20px;
        display: block;
        width: 100%;
        color: var(--white-color);
    }
    
    .main-nav.mobile-menu-open .sub-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border-radius: 0;
        background: #222;
        margin-top: 0;
        display: none;
    }
    
    .main-nav.mobile-menu-open .sub-menu-open .sub-menu {
        display: block;
    }
    
    .main-nav.mobile-menu-open .sub-menu a {
        padding: 10px 40px;
        font-size: 14px;
        color: #ccc;
    }
    
    .main-nav.mobile-menu-open .sub-menu a:hover {
        background: #333;
        color: #ff7a00;
    }
}

@media (max-width: 480px) {
    .header .container {
        padding: 0 10px;
    }
    
    .logo img {
        height: 35px;
    }
    
    .main-nav.mobile-menu-open li > a {
        padding: 12px 15px;
        font-size: 14px;
    }
    
    .main-nav.mobile-menu-open .sub-menu a {
        padding: 8px 30px;
        font-size: 13px;
    }
}