.back-header {
    background: #fff;
    padding: 15px 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 20px;
    position: relative;
    display: flex;
    align-items: center;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    color: #333;
    font-size: 16px;
    transition: all 0.3s;
}

.back-btn:hover {
    color: #4CAF50;
}

.back-btn .arrow {
    margin-right: 8px;
    font-size: 20px;
}

.page-title {
    font-size: 18px;
    margin: 0;
    flex-grow: 1;
    text-align: center;
    color: #333;
}

/* 为工具页面添加顶部内边距，避免返回按钮遮挡内容 */
.tool-page {
    padding: 0 20px 20px;
}

@media (max-width: 768px) {
    .back-header {
        padding: 12px 15px;
        margin-bottom: 15px;
    }

    .back-btn {
        font-size: 14px;
    }

    .back-btn .arrow {
        font-size: 18px;
    }

    .page-title {
        font-size: 16px;
    }

    .tool-page {
        padding: 0 15px 15px;
    }
}