* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft YaHei", system-ui, sans-serif;
        }
        body {
            background-color: #f7f8fa;
            color: #333;
            line-height: 1.7;
        }

        /* 顶部横幅背景区域 */
        .banner {
            width: 100%;
            height: 420px;
            /* 背景图地址，可替换为自己的图片链接 */
            background-image: url("/images/deno.webp");
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: #fff;
        }
        /* 深色遮罩，让文字更清晰 */
        .banner::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.15);
        }
        .banner-text {
            position: relative;
            z-index: 2;
            padding: 0 20px;
        }
        .banner-text h1 {
            font-size: 42px;
            margin-bottom: 12px;
            letter-spacing: 3px;
        }
        .banner-text p {
            font-size: 18px;
            opacity: 0.9;
            max-width: 600px;
            margin: 0 auto;
        }

        /* 主体容器 单栏居中 */
        .container {
            max-width: 760px;
            margin: -60px auto 80px;
            padding: 0 20px;
            position: relative;
            z-index: 3;
        }

       
 /* 页脚 */
        footer {
            text-align: center;
            padding: 30px 0;
            color: #999;
            font-size: 14px;
        }