/* 顶部导航栏 */
.header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.logo img {
    width: 100%;
}

.logo-title {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.logo-title a {
    text-decoration: none;
    color: inherit;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

/* 登录按钮 */
.login-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.login-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.login-btn.logged-in {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}



/* 用户信息区域样式 */
.user-info {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-evenly;
    border-radius: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 120px;
}

.user-info:hover {
    background-color: var(--bg-color) !important;
}

.user-info .avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid transparent;
    transition: border-color 0.3s ease;
}

.user-info .avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-info .nickname {
    font-size: 15px;
    color: var(--text-color) !important;
    font-weight: 500;
    transition: color 0.3s ease;
}

/* 下拉菜单样式 */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 15px);
    right: 0;
    width: 120px;
    background-color: var(--card-bg) !important;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color) !important;
}

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

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s;
}

.dropdown-menu a:hover {
    background-color: var(--bg-color) !important;
    color: var(--primary-color) !important;
}

.dropdown-menu a i {
    font-size: 16px;
    opacity: 0.8;
}

@media (max-width: 768px) {
    .user-info {
        display: none;
    }
}