body {
            overflow-x: hidden;
        }

        .captcha-block {
            position: absolute;
            left: 0;
            top: 0;
        }

        .card {
            display: flex;
            flex-direction: column;
            min-width: 0;
            word-wrap: break-word;
            background-clip: border-box;
            border: 1px solid rgba(0,0,0,.125);
        }

        .card-header {
            padding: .75rem 1.25rem;
            margin-bottom: 0;
            background-color: rgba(0,0,0,.03);
            border-bottom: 1px solid rgba(0,0,0,.125);
        }

        .card-header:first-child {
            border-radius: calc(.25rem - 1px) calc(.25rem - 1px) 0 0;
        }

        .card-body {
            flex: 1 1 auto;
            padding: 1.25rem;
        }

        /* Canvas Loading Overlay */
        .canvas-loading {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 155px; /* Match canvas height */
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            z-index: 2;
            border-radius: 2px;
        }

        .loading-spinner {
            width: 40px;
            height: 40px;
            border: 4px solid #f3f3f3;
            border-top: 4px solid #1991FA;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-bottom: 12px;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .loading-text {
            color: #45494c;
            font-size: 14px;
            font-weight: 500;
        }

        .sliderContainer {
            position: relative;
            text-align: center;
            line-height: 40px;
            background: #f7f9fa;
            color: #45494c;
            border-radius: 2px;
        }

        .sliderbg {
            position: absolute;
            left: 0;
            right: 0;
            top: 0;
            background-color: #f7f9fa;
            height: 40px;
            border-radius: 2px;
            border: 1px solid #e6e8eb;
        }

        .sliderContainer_active .slider {
            top: -1px;
            border: 1px solid #1991FA;
        }

        .sliderContainer_active .sliderMask {
            border-width: 1px 0 1px 1px;
        }

        .sliderContainer_success .slider {
            top: -1px;
            border: 1px solid #52CCBA;
            background-color: #52CCBA !important;
        }

        .sliderContainer_success .sliderMask {
            border: 1px solid #52CCBA;
            border-width: 1px 0 1px 1px;
            background-color: #D2F4EF;
        }

        .sliderContainer_success .sliderIcon:before {
            content: "\f00c";
        }

        .sliderContainer_fail .slider {
            top: -1px;
            border: 1px solid #f57a7a;
            background-color: #f57a7a !important;
        }

        .sliderContainer_fail .sliderMask {
            border: 1px solid #f57a7a;
            background-color: #fce1e1;
            border-width: 1px 0 1px 1px;
        }

        .sliderContainer_fail .sliderIcon:before {
            content: "\f00d";
        }

        .sliderContainer_active .sliderText, 
        .sliderContainer_success .sliderText, 
        .sliderContainer_fail .sliderText {
            display: none;
        }

        .sliderMask {
            position: absolute;
            left: 0;
            top: 0;
            height: 40px;
            border: 0 solid #1991FA;
            background: #D1E9FE;
            border-radius: 2px;
        }

        .slider {
            position: absolute;
            top: 0;
            left: 0;
            width: 40px;
            height: 40px;
            background: #fff;
            box-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
            cursor: pointer;
            transition: background .2s linear;
            border-radius: 2px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .slider:hover {
            background: #1991FA;
        }

        .slider:hover .sliderIcon {
            background-position: 0 -13px;
        }

        .sliderText {
            position: relative;
        }

        .refreshIcon {
            position: absolute;
            right: 0;
            top: 0;
            cursor: pointer;
            margin: 6px;
            color: rgba(0,0,0,.25);
            font-size: 1rem;
            z-index: 5;
            transition: color .3s linear;
        }

        .refreshIcon:hover {
            color: #6c757d;
        }

        .text-danger {
            color: #dc3545;
        }