/* 头部骨架屏样式 - 用于所有页面 */
.header-skeleton {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: white;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.skeleton-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.skeleton-logo {
    width: 150px;
    height: 40px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

.skeleton-nav {
    display: flex;
    gap: 30px;
    align-items: center;
}

.skeleton-nav-item {
    width: 80px;
    height: 20px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* 移动端隐藏部分骨架屏元素 */
@media (max-width: 768px) {
    .skeleton-nav-item:nth-child(n+4) {
        display: none;
    }
}

/* 头部加载完成后隐藏骨架屏 */
.header-loaded .header-skeleton {
    display: none;
}