body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        .nav-card {
            transition: all 0.3s ease;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0,0,0,0.2);
        }

        .nav-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.3);
        }

        .feature-icon {
            width: 70px;
            height: 70px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            margin: 0 auto 15px;
            font-size: 28px;
        }

        .image-upload-section {
            border: 2px dashed #ddd;
            border-radius: 0.5rem;
            padding: 1.5rem;
            text-align: center;
            background-color: #fafafa;
            transition: all 0.3s ease;
        }

        .image-upload-section.dragover {
            border-color: #3b82f6;
            background-color: #f0f9ff;
        }

        .image-preview {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin-top: 1rem;
        }

        .preview-item {
            position: relative;
            width: 100px;
            height: 100px;
            border: 1px solid #ddd;
            border-radius: 0.375rem;
            overflow: hidden;
        }

        .preview-item img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .preview-item .remove-btn {
            position: absolute;
            top: 0.25rem;
            right: 0.25rem;
            background-color: rgba(239, 68, 68, 0.8);
            color: white;
            border: none;
            border-radius: 50%;
            width: 1.25rem;
            height: 1.25rem;
            cursor: pointer;
            font-size: 0.75rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        @media (max-width: 768px) {
            .mobile-nav-grid {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .feature-icon {
                width: 60px;
                height: 60px;
                font-size: 24px;
            }

            .preview-item {
                width: 80px;
                height: 80px;
            }
        }

        /* 背景音乐播放器样式 */
        .bg-music-player {
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 10px;
            padding: 10px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        .music-controls {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .music-btn {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            transition: all 0.3s ease;
        }
        .music-btn:hover {
            transform: scale(1.1);
            box-shadow: 0 0 15px rgba(102, 126, 234, 0.5);
        }
        .music-info {
            font-size: 12px;
            color: #666;
            font-weight: 500;
        }