/* 全局重置 - 精简且规范 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* 页面主体 - 纯净渐变底，提升高级感 */
        body {
            width: 100vw;
            height: 100vh;
            background: linear-gradient(180deg, #f8faff 0%, #f5f9ff 100%);
            display: grid;
            place-items: center;
            overflow: hidden;
            font-family: 'PingFang SC', 'Helvetica Neue', 'Microsoft YaHei', sans-serif;
        }

        /* 核心容器 - 紧凑布局，层次分明 */
        .launch-core {
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1.6rem;
            animation: coreShow 2s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
            opacity: 0;
            position: relative;
        }

        /* 图标外层 - 精致光晕+渐变边框，提升质感 */
        .icon-container {
            width: 110px;
            height: 110px;
            border-radius: 22px;
            padding: 3px;
            background: linear-gradient(135deg, #eef5ff 0%, #dbe9ff 100%);
            box-shadow: 0 8px 24px rgba(149, 173, 202, 0.12),
                        0 2px 6px rgba(149, 173, 202, 0.08);
            position: relative;
        }

        /* 应用图标 - 精致圆角，纯净边框 */
        .app-icon {
            width: 100%;
            height: 100%;
            border-radius: 20px;
            object-fit: cover;
            border: 2px solid #ffffff;
            /* 极细腻悬浮动效，更显精致 */
            animation: iconFloat 7s ease-in-out infinite alternate;
        }

        /* 图标微光效果 - 提升精致感，不突兀 */
        .icon-container::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            border-radius: 22px;
            background: linear-gradient(135deg, rgba(255,255,255,0.6) 0%, rgba(255,255,255,0) 50%);
            pointer-events: none;
        }

        /* 应用名称 - 精致排版，高级配色 */
        .app-title {
            font-size: 30px;
            font-weight: 600;
            color: #163b66;
            letter-spacing: 2px;
            position: relative;
        }

        /* 标题底部精致下划线 - 细节拉满 */
        .app-title::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 2px;
            background: linear-gradient(90deg, #c5d9f3 0%, #8db4e2 100%);
            border-radius: 1px;
            animation: titleLineShow 3s ease forwards;
            opacity: 0;
        }

        /* 应用副标题 - 柔和配色，细腻排版 */
        .app-subtitle {
            font-size: 1.1rem;
            color: #5a7fa8;
            font-weight: 400;
            letter-spacing: 1px;
            margin-top: 0.5rem;
            animation: subShow 3s ease forwards;
            opacity: 0;
        }

        /* 倒计时组件 - 精致通透，柔和阴影 */
        .countdown {
            position: fixed;
            bottom: 2rem;
            left: 50%;
            transform: translateX(-50%);
            padding: 0.6rem 1.5rem;
            font-size: 0.95rem;
            color: #4a6e9c;
            background-color: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(8px);
            border-radius: 24px;
            box-shadow: 0 4px 16px rgba(149, 173, 202, 0.1),
                        0 1px 3px rgba(149, 173, 202, 0.06);
            border: 1px solid rgba(230, 240, 255, 0.9);
            animation: countdownShow 2.5s ease forwards;
            opacity: 0;
        }

        /* 核心入场动画 - 顺滑细腻，不生硬 */
        @keyframes coreShow {
            0% {
                opacity: 0;
                transform: translateY(20px);
            }
            80% {
                opacity: 0.95;
                transform: translateY(-2px);
            }
            100% {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* 图标悬浮动画 - 极轻微位移+角度变化，更精致灵动 */
        @keyframes iconFloat {
            0% {
                transform: translateY(0) rotate(-0.5deg);
            }
            100% {
                transform: translateY(-6px) rotate(0.5deg);
            }
        }

        /* 副标题淡入动画 - 延迟触发，层次感强 */
        @keyframes subShow {
            0% {
                opacity: 0;
                transform: translateY(8px);
            }
            100% {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* 倒计时淡入动画 - 顺滑自然 */
        @keyframes countdownShow {
            0% {
                opacity: 0;
                transform: translateX(-50%) translateY(15px);
            }
            100% {
                opacity: 1;
                transform: translateX(-50%) translateY(0);
            }
        }

        /* 标题下划线淡入动画 - 细节精致 */
        @keyframes titleLineShow {
            0% {
                opacity: 0;
                width: 0;
            }
            100% {
                opacity: 1;
                width: 40px;
            }
        }

        /* 响应式适配 - 保持精致度不丢失 */
        @media (max-width: 375px) {
            .icon-container {
                width: 90px;
                height: 90px;
                border-radius: 18px;
            }
            .app-icon {
                border-radius: 16px;
            }
            .icon-container::after {
                border-radius: 18px;
            }
            .app-title {
                font-size: 2.2rem;
                letter-spacing: 1.5px;
            }
            .app-title::after {
                width: 30px;
                bottom: -6px;
            }
            .app-subtitle {
                font-size: 1rem;
            }
            .countdown {
                padding: 0.5rem 1.2rem;
                font-size: 0.85rem;
                bottom: 1.5rem;
            }
        }