* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
        }

        body {
            background-color: #ffffff;
            color: #333333;
            padding: 30px 20px;
            /* 简约科技蓝渐变背景（平铺式，无卡片） */
            background-image: 
                radial-gradient(circle at top left, rgba(21, 138, 255, 0.03) 0%, transparent 40%),
                radial-gradient(circle at bottom right, rgba(21, 138, 255, 0.03) 0%, transparent 40%);
            min-height: 100vh;
        }

        .content {
            width: 100%;
            max-width: 450px;
            margin: 0 auto;
            text-align: center;
        }

        .app-icon {
            width: 70px;
            height: 70px;
            margin: 0 auto 20px;
            border-radius: 18px;
            background-color: #f5f9ff;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(21, 138, 255, 0.15);
        }

        .app-icon i {
            font-size: 36px;
            color: #158aff;
        }

        h1 {
            font-size: 26px;
            color: #158aff;
            margin-bottom: 12px;
            font-weight: 600;
        }

        .desc {
            font-size: 15px;
            color: #666666;
            margin-bottom: 30px;
            line-height: 1.6;
        }

        /* 苹果原生分享按钮提示样式（突出引导） */
        .share-tip-card {
            padding: 25px 20px;
            border: 1px solid rgba(21, 138, 255, 0.1);
            border-radius: 12px;
            background-color: #f8fbff;
            margin-bottom: 25px;
        }

        .share-icon-demo {
            font-size: 24px;
            color: #158aff;
            margin-bottom: 15px;
        }

        .guide-title {
            font-size: 16px;
            color: #333;
            font-weight: 500;
            margin-bottom: 10px;
        }

        .guide-steps {
            font-size: 14px;
            color: #666;
            line-height: 1.8;
            text-align: left;
            margin: 0 auto;
            max-width: 380px;
        }

        .guide-steps li {
            margin-bottom: 8px;
            list-style: none;
            position: relative;
            padding-left: 20px;
        }

        .guide-steps li:before {
            content: "●";
            color: #158aff;
            font-size: 12px;
            position: absolute;
            left: 0;
            top: 2px;
        }

        .highlight {
            color: #158aff;
            font-weight: 500;
        }

        /* 引入字体图标 */
        @import url('https://cdn.bootcdn.net/ajax/libs/font-awesome/6.4.0/css/all.min.css');