/* 呼吸灯特效 */
        @keyframes breathe {
            0%, 100% { box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.3), 0 4px 6px -2px rgba(59, 130, 246, 0.2); }
            50% { box-shadow: 0 20px 25px -5px rgba(59, 130, 246, 0.6), 0 10px 10px -5px rgba(59, 130, 246, 0.4); }
        }
        .breathing-shadow { animation: breathe 4s ease-in-out infinite; }
        html { scroll-behavior: smooth; }
        
        /* 视频容器优化：确保竖屏视频在背景框中比例协调 */
        .video-aspect-ratio {
            position: relative;
            padding-bottom: 177.77%; /* 9:16 Aspect Ratio */
            height: 0;
            overflow: hidden;
            border-radius: 12px; /* 视频本身的圆角 */
        }
        .video-aspect-ratio iframe {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }