.main-header {
    background: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: relative;
    z-index: 100;
}

.main-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo {
    max-width: 200px;
}

.logo img {
    max-width: 100%;
    height: auto;
}

.main-nav {
    flex: 1;
    margin-left: 50px;
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: flex-end;
}

.main-nav ul li {
    margin-left: 30px;
}

.main-nav ul li a {
    color: #333;
    text-decoration: none;
    font-size: 16px;
    padding: 10px 0;
    display: block;
    transition: color 0.3s;
}

.main-nav ul li a:hover {
    color: #0056b3;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
}

.mobile-menu.show {
    display: block;
}

.mobile-menu nav {
    padding: 20px;
}

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

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

.mobile-menu ul li a {
    display: block;
    padding: 10px;
    color: #333;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s;
}

.mobile-menu ul li a:hover {
    color: #0056b3;
}

@media (min-width: 768px) {
    .mobile-menu {
        display: none !important;
    }
}

/* 移动菜单按钮样式 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: #333;
    transition: all 0.3s ease;
}

@media (max-width: 767px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    .main-nav {
        display: none;
    }
    
    .main-nav.show {
        display: block;
    }
}