/* Toast提示系统 - 居中显示 */
        #toastContainer {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 10000;
            display: flex;
            flex-direction: column;
            gap: 10px;
            pointer-events: none;
        }

        .toast {
            background: #000;
            color: #fff;
            border: 2px solid #000;
            border-radius: 8px;
            padding: 15px 25px;
            min-width: 300px;
            max-width: 500px;
            text-align: center;
            font-size: 16px;
            font-weight: bold;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
            opacity: 0;
            transform: translateY(-20px);
            transition: all 0.3s ease;
            pointer-events: auto;
        }

        .toast.show {
            opacity: 1;
            transform: translateY(0);
        }

        .toast.success {
            background: #27ae60;
            color: #fff;
            border-color: #27ae60;
        }

        .toast.error {
            background: #e74c3c;
            color: #fff;
            border-color: #e74c3c;
        }

        .toast.warning {
            background: #e74c3c;
            color: #fff;
            border-color: #e74c3c;
        }

        .toast.info {
            background: #000;
            color: #fff;
            border-color: #000;
        }