* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --main-red: #FF2D3B;
            --sub-gold: #FFD25F;
            --bg-light: #FFF9E6;
            --text-dark: #4A2B2D;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background-color: #fff;
        }
        a {
            text-decoration: none;
        }

        /* 导航栏：去除下载按钮，仅保留 logo 与品牌名 */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 75px;
            background: #fff;
            box-shadow: 0 4px 12px rgba(255, 45, 59, 0.1);
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 10%;
            z-index: 9999;
        }
        .nav-left {
            display: flex;
            align-items: center;
        }
        .nav-left img {
            width: 45px;
            height: 45px;
            border-radius: 10px;
            margin-right: 12px;
        }
        .nav-left span {
            font-size: 24px;
            font-weight: 800;
            color: var(--main-red);
        }

        /* Hero 区域 */
        .hero {
            padding: 180px 10% 100px;
            background: linear-gradient(180deg, #FFFFFF 0%, var(--bg-light) 100%);
            display: flex;
            align-items: center;
        }
        .hero-info {
            flex: 1;
        }
        .hero-info h1 {
            font-size: 48px;
            color: var(--main-red);
            margin-bottom: 25px;
            text-shadow: 1px 1px 0px #fff;
        }
        .hero-info p {
            font-size: 20px;
            color: #7A5C5E;
            margin-bottom: 45px;
            max-width: 600px;
        }

        /* 下载按钮组：自适应宽度，手机更宽 */
        .dl-group {
            display: flex;
            gap: 20px;
        }
        .dl-item {
            padding: 15px 35px;
            border-radius: 12px;
            color: #fff;
            font-size: 18px;
            font-weight: bold;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: 0.3s;
            background: var(--main-red);
            border: 2px solid var(--main-red);
            text-align: center;
        }
        .ios {
            background: #333;
            border-color: #333;
        }
        .dl-item:hover {
            opacity: 0.9;
            transform: translateY(-3px);
        }

        /* 特性卡片 */
        .features {
            padding: 80px 10%;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            background: #fff;
        }
        .feat-card {
            text-align: center;
        }
        .feat-card::before {
            content: "●";
            display: block;
            font-size: 48px;
            line-height: 1;
            color: var(--main-red);
            margin-bottom: 16px;
            opacity: 0.85;
        }
        .feat-card h3 {
            margin-bottom: 12px;
            font-size: 20px;
            color: var(--main-red);
        }
        .feat-card p {
            font-size: 15px;
            color: #888;
        }

        /* 详情行 */
        .app-detail {
            padding: 80px 10%;
            background-color: #fff;
        }
        .row {
            display: flex;
            align-items: center;
            gap: 80px;
            margin-bottom: 120px;
        }
        .row.reverse {
            flex-direction: row-reverse;
        }
        .row-img {
            flex: 1;
            text-align: center;
            min-height: 200px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .row-img::after {
            content: "📱";
            font-size: 120px;
            line-height: 1;
            opacity: 0.15;
            color: var(--main-red);
            filter: drop-shadow(0 10px 10px rgba(255,45,59,0.1));
        }
        .row-text {
            flex: 1;
        }
        .row-text h2 {
            font-size: 36px;
            margin-bottom: 25px;
            color: var(--text-dark);
            position: relative;
        }
        .row-text h2::after {
            content: "";
            display: block;
            width: 50px;
            height: 5px;
            background: var(--sub-gold);
            margin-top: 10px;
            border-radius: 3px;
        }
        .row-text p {
            font-size: 18px;
            color: #666;
            line-height: 1.8;
        }

        /* 页脚 */
        footer {
            background: var(--text-dark);
            color: #E6C8C9;
            padding: 70px 10% 40px;
            text-align: center;
        }
        .footer-nav {
            margin-bottom: 35px;
        }
        .footer-nav a {
            color: #E6C8C9;
            margin: 0 15px;
            font-size: 15px;
        }
        .footer-nav a:hover {
            color: var(--sub-gold);
        }
        .copy {
            font-size: 13px;
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 30px;
            line-height: 2;
        }

        /* 移动端适配 */
        @media (max-width: 768px) {
            .navbar {
                padding: 0 5%;
            }
            .hero {
                flex-direction: column;
                text-align: center;
                padding-top: 130px;
            }
            .hero-info h1 {
                font-size: 32px;
            }

            /* 下载按钮组：手机端自适应更宽 */
            .dl-group {
                display: flex;
                flex-direction: column;  /* 手机端垂直排列，宽度更充裕 */
                gap: 16px;
                width: 100%;
                max-width: 400px;
                margin: 0 auto;
            }
            .dl-item {
                width: 100%;           /* 占满容器宽度，视觉更宽 */
                padding: 18px 20px;    /* 上下加大内边距，触摸区域更大 */
                font-size: 19px;
                justify-content: center;
            }

            .features {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .row,
            .row.reverse {
                flex-direction: column;
                text-align: center;
                gap: 40px;
                margin-bottom: 60px;
            }
            .row-text h2::after {
                margin: 10px auto;
            }
            .row-img::after {
                font-size: 90px;
            }
        }