/* body {
            font-family: 'Inter', sans-serif;
            background-color: #f3f4f6;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            flex-direction: column;
            overflow: hidden; // Prevent body scroll 
        }
         */

    /* 遮罩层样式 */
    .overlay {
        position: absolute;
        /* 相对表单容器定位 */
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(255, 255, 255, 0.85);
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 50;
        /* 保证在表单内容上层 */
        transition: opacity 0.3s ease;
    }

    .overlay.hidden {
        opacity: 0;
        pointer-events: none;
    }

    /* SVG 动画 */
    .loader {
        width: 80px;
        height: 80px;
    }

    .loader circle {
        stroke-dasharray: 282.74;
        /* 90 * 2 * PI */
        stroke-dashoffset: 0;
        transform-origin: 50% 50%;
        animation: dash 1.5s ease-in-out infinite,
            color 6s ease-in-out infinite;
    }

    @keyframes dash {
        0% {
            stroke-dashoffset: 282.74;
        }

        50% {
            stroke-dashoffset: 70.685;
            transform: rotate(135deg);
        }

        100% {
            stroke-dashoffset: 282.74;
            transform: rotate(450deg);
        }
    }

    @keyframes color {
        0% {
            stroke: #4299e1;
        }

        25% {
            stroke: #667eea;
        }

        50% {
            stroke: #9f7aea;
        }

        75% {
            stroke: #d53f8c;
        }

        100% {
            stroke: #4299e1;
        }
    }

    /* Dot Pulsing Animation */
    .dot-loader {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
    }

    .dot-loader div {
        width: 15px;
        height: 15px;
        background-color: #3b82f6;
        border-radius: 50%;
        animation: pulse 1.4s ease-in-out infinite;
    }

    .dot-loader div:nth-child(2) {
        animation-delay: -0.2s;
    }

    .dot-loader div:nth-child(3) {
        animation-delay: -0.4s;
    }

    @keyframes pulse {

        0%,
        100% {
            transform: scale(0);
            opacity: 0;
        }

        50% {
            transform: scale(1);
            opacity: 1;
        }
    }

    /* New Bouncing Balls Animation */
    .bouncing-loader {
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .bouncing-loader>div {
        width: 20px;
        height: 20px;
        margin: 0 5px;
        background-color: #4f46e5;
        border-radius: 50%;
        animation: bounce 0.6s infinite alternate;
    }

    .bouncing-loader>div:nth-child(2) {
        animation-delay: 0.2s;
    }

    .bouncing-loader>div:nth-child(3) {
        animation-delay: 0.4s;
    }

    @keyframes bounce {
        from {
            transform: translateY(0);
        }

        to {
            transform: translateY(-20px);
        }
    }

    .flex-row-buttons {
        display: flex;
        flex-direction: row;
        gap: 1rem;
        /* Spacing between buttons */
        margin-top: 2rem;
    }

    /* 局部遮罩层（覆盖表单用） */
    /* #loading-overlay-dot {
    position: absolute;   // 相对表单容器定位 
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255,255,255,0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;  // 保证在表单内容上层
    transition: opacity 0.3s ease;
}

#loading-overlay-dot.hidden {
    opacity: 0;
    pointer-events: none;
} */