body {
            margin: 0;
            font-family: "Segoe UI", sans-serif;
            background-color: #f9f9f9;
        }

        /* 头部背景图 + 按钮 */
        .hero-header {
            background-image: url('../pictures/bg.jpg'); /* 示例图片，可替换 */
            background-size: cover;
            background-position: center;
            height: 100vh; /* 占满整个视口高度 */
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.6);
            position: relative;
            padding-bottom: 120px; /* 给按钮留出空间 */
        }

        .hero-header h1 {
            font-size: 3rem;
            font-weight: bold;
        }

        .hero-header p {
            font-size: 1.25rem;
        }

        /* 下载按钮容器 */
       /*  .download-buttons {
            position: absolute;
            bottom: 15px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 10;
            width: 100%;
            max-width: 600px;
            padding: 0 20px;
            box-sizing: border-box;
            display: flex;
            justify-content: space-between;
        }*/
        
         .download-buttons {
            position: fixed;
            bottom: 20px; /* 距离底部 20px */
            left: 0;
            right: 0;
            display: flex;
            justify-content: center; /* 水平居中 */
            gap: 20px;
            flex-wrap: wrap;
        } 

        .download-btn {
            width: 48%; /* 每个按钮占48%，留出2%的间隔 */
            font-size: 1rem;
            padding: 12px 16px;
            display: inline-block;
            transition: transform 0.2s ease, background-color 0.2s ease;
        }
        
        

        .icon-lg {
            font-size: 1.25rem;
            vertical-align: middle;
            margin-right: 0.5rem;
        }

        /* 点击动画 */
        @keyframes clickEffect {
            0% {
                transform: scale(1);
                background-color: var(--bs-btn-bg);
            }
            50% {
                transform: scale(0.95);
                background-color: var(--bs-btn-hover-bg);
            }
            100% {
                transform: scale(1);
                background-color: var(--bs-btn-bg);
            }
        }

        .animate-click:active {
            animation: clickEffect 0.25s forwards;
        }

        /* 在线客服浮动按钮（右上角） */
        .chat-button {
            position: fixed;
            right: 1rem;
            top: 1rem;
            z-index: 1000;
            background-color: #ff4d4d;
            color: white;
            border: none;
            border-radius: 30px;
            padding: 10px 20px;
            font-size: 1rem;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { transform: scale(1); opacity: 1; }
            50% { transform: scale(1.05); opacity: 0.7; }
            100% { transform: scale(1); opacity: 1; }
        }

        .chat-button:hover {
            animation-play-state: paused;
        }

        .chat-button i {
            transition: transform 0.3s ease;
        }

        .chat-button:hover i {
            transform: rotate(15deg);
        }

        /* 移动端适配 */
        @media (max-width: 768px) {
            .hero-header h1 {
                font-size: 2rem;
            }

            .hero-header p {
                font-size: 1rem;
            }

            .download-btn {
                width: 48%; /* 保持48%宽度 */
                font-size: 0.9rem; /* 调整字体大小以适应小屏幕 */
            }
        }