/* 悬浮联系图标样式 */
        .float-contact {
            position: fixed;
            right: 30px;
            bottom: 30px;
            z-index: 1000;
        }
        
        .contact-btn {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: linear-gradient(135deg, #3498db, #2ecc71);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 8px 25px rgba(52, 152, 219, 0.4);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }
        
        .contact-btn:hover {
            transform: translateY(-5px) scale(1.05);
            box-shadow: 0 12px 30px rgba(52, 152, 219, 0.6);
        }
        
        .contact-btn i {
            font-size: 28px;
            color: white;
            transition: transform 0.3s;
        }
        
        .contact-btn:hover i {
            transform: rotate(20deg);
        }
        
        .pulse-ring {
            position: absolute;
            width: 100%;
            height: 100%;
            border-radius: 50%;
            border: 2px solid rgba(52, 152, 219, 0.7);
            animation: pulse 2s infinite;
        }
        
        @keyframes pulse {
            0% {
                transform: scale(0.8);
                opacity: 1;
            }
            100% {
                transform: scale(1.3);
                opacity: 0;
            }
        }
        
        /* 弹窗样式 */
        .qrcode-modal {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            z-index: 2000;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
        }
        
        .qrcode-modal.active {
            opacity: 1;
            visibility: visible;
        }
        
        .modal-content {
            background-color: white;
            width: 90%;
            max-width: 400px;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
            transform: translateY(30px);
            transition: transform 0.4s ease;
        }
        
        .qrcode-modal.active .modal-content {
            transform: translateY(0);
        }
        
        .modal-header {
            background: linear-gradient(135deg, #3498db, #2ecc71);
            padding: 20px 30px;
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .modal-header h3 {
            font-weight: 600;
            font-size: 1.4rem;
        }
        
        .close-btn {
            background: transparent;
            border: none;
            color: white;
            font-size: 28px;
            cursor: pointer;
            line-height: 1;
            transition: transform 0.2s;
        }
        
        .close-btn:hover {
            transform: rotate(90deg);
        }
        
        .modal-body {
            padding: 30px;
            text-align: center;
        }
        
        .qrcode-container {
            width: 200px;
            height: 200px;
            margin: 0 auto 25px;
            padding: 15px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .qrcode-placeholder {
            width: 170px;
            height: 170px;
            background: #f8f9fa;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            color: #7f8c8d;
        }
        
        .qrcode-placeholder i {
            font-size: 50px;
            margin-bottom: 10px;
            color: #3498db;
        }
        
        .modal-body p {
            color: #555;
            line-height: 1.6;
            margin-bottom: 20px;
        }
        
        .contact-options {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-top: 20px;
        }
        
        .contact-option {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 10px 15px;
            background-color: #f8f9fa;
            border-radius: 50px;
            color: #3498db;
            font-weight: 500;
        }
        
        .contact-option i {
            font-size: 18px;
        }
        
        /* 示例内容区域 */
        .content-area {
            padding: 30px;
            background: #f8f9fa;
            border-radius: 10px;
            margin-top: 20px;
        }
        
        .content-area h2 {
            color: #2c3e50;
            margin-bottom: 15px;
        }
        
        .content-area p {
            line-height: 1.7;
            margin-bottom: 15px;
        }
        
        .instructions {
            background-color: #fff8e1;
            border-radius: 10px;
            padding: 20px;
            margin-top: 40px;
            border-left: 4px solid #ffc107;
        }
        
        .instructions h3 {
            color: #2c3e50;
            margin-bottom: 10px;
        }
        
        .instructions ol {
            margin-left: 20px;
            line-height: 1.8;
        }
        
        .instructions li {
            margin-bottom: 8px;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .float-contact {
                right: 20px;
                bottom: 20px;
            }
            
            .contact-btn {
                width: 60px;
                height: 60px;
            }
            
            .contact-btn i {
                font-size: 24px;
            }
            
            .demo-container {
                padding: 20px;
            }
            
            h1 {
                font-size: 2rem;
            }
        }