* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            /* 纯黑色背景 */
            background-color: #000000;
            /* 全屏居中布局 */
            width: 100vw;
            height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 1.2rem;
            overflow: hidden;

            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
        }
        .show-text {
            color: #ffffff;
            font-size: 2.5rem;
            font-family: "Microsoft Yahei", sans-serif;
            text-align: center;
            /* 渐隐渐现动画 */
            animation: fade 3s ease-in-out;
            opacity: 0;
        }
        .audio-play-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 180px;
            padding: 0.9rem 1.4rem;
            border: 1px solid #ffffff;
            border-radius: 999px;
            background: #ffffff;
            color: #000000;
            font-size: 1rem;
            font-family: "Microsoft Yahei", sans-serif;
            cursor: pointer;
            opacity: 0;
            pointer-events: none;
            transform: translateY(8px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }
        .audio-play-btn.show {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0);
        }
        .audio-play-btn.hide {
            opacity: 0;
            pointer-events: none;
            transform: translateY(8px);
        }
        @keyframes fade {
        0% { opacity: 0; }
            50% { opacity: 1; }
            100% { opacity: 0; }
        }