.page-header {
        background: var(--bg-white);
        height: 50px;
        padding: 0 var(--spacing-md);
        /* box-shadow: var(--shadow-sm);*/
        /* 改为fixed定位使header固定在顶部 */
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 100;
        display: flex;
        align-items: center;
        border-bottom:1px solid #f0efef;
    }

    .page-header-content {
        max-width: 600px;
        margin: 0 auto;
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        position: relative;
        height: 100%;
    }

    /* 重新设计返回按钮样式 */
    .back-btn {

    }

    .back-btn:active {
        transform: scale(0.95);
        box-shadow: var(--shadow-xs);
    }

    .back-btn svg {
        width: 20px;
        height: 20px;
        stroke-width: 2.5;
    }

    .page-title {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        font-size: var(--font-lg);
        font-weight: var(--font-semibold);
        color: #555;
        white-space: nowrap;
    }

    .header-spacer {
        width: 40px;
    }