/* 头部导航栏样式 */
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 60px;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo样式 */
.logo img {
    height: 50px;
    width: 150px;
}

/* PC端导航菜单 */
.desktop-nav {
    display: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #17a2b8;
}

/* 用户头像 */
.user-avatar {
    position: relative;
    cursor: pointer;
}

.user-avatar img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    transition: transform 0.3s ease;
}

.user-avatar:hover img {
    transform: scale(1.1);
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    margin-top: 10px;
}

.dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: 12px 16px;
    text-decoration: none;
    color: #333;
    transition: background-color 0.3s ease;
    border-bottom: 1px solid #f0f0f0;
}

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

.dropdown-item:hover {
    background-color: #f8f9fa;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
    gap: 4px;
}

.mobile-menu-btn span {
    width: 20px;
    height: 2px;
    background: #333;
    transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* 移动端侧边菜单 */
.mobile-sidebar {
    position: fixed;
    top: 60px;
    left: -250px;
    width: 250px;
    height: calc(100vh - 60px);
    background: #fff;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    transition: left 0.3s ease;
    z-index: 999;
    padding: 20px 0;
}

.mobile-sidebar.show {
    left: 0;
}

.sidebar-item {
    display: block;
    padding: 15px 20px;
    text-decoration: none;
    color: #333;
    border-bottom: 1px solid #f0f0f0;
    transition: background-color 0.3s ease;
}

.sidebar-item:hover {
    background-color: #f8f9fa;
}

/* PC端样式 */
@media (min-width: 768px) {
    .mobile-menu-btn {
        display: none;
    }
    
    .desktop-nav {
        display: flex;
    }
    
    .mobile-sidebar {
        display: none;
    }

}