body {
    background-color: #f5f5f5;
    background-image: url(../images/bg.png);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 14px;
    color: #444;
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
    position: relative;
}
.Achieve{
    background-color: #ffffff;
    backdrop-filter: blur(5px);
    border-radius: 10px;
    box-shadow: #44444488 0px 0px 5px;
}
.subtittle{
    position: absolute;
    font-family: sans-serif;
    color: white;
    background-color: rgba(0, 0, 0, 0.212);
    font-size: 25px;
    font-weight: bold;
    text-align: center;
    bottom: 5px;
    border-radius: 10px;
    
}

        /* 遮罩层样式 */
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 500;
            display: none;
            opacity: 0;
            transition: opacity 0.3s ease-in-out;
        }

        /* 弹窗样式 */
        .popup {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background-color: white;
            padding: 20px;
            border: 1px solid black;
            border-radius: 10px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
            z-index: 1000;
            display: none;
            opacity: 0;
            transition: opacity 0.3s ease-in-out;
        }

        /* 弹窗标题样式 */
        .popup h2 {
            margin-top: 0;
            color: #333;
        }

        /* 弹窗关闭按钮样式 */
        .popup button {
            padding: 10px 20px;
            background-color: #333;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
        }

        /* 弹窗关闭按钮悬停样式 */
        .popup button:hover {
            background-color: #555;
        }

        /* 表单样式 */
        .popup form {
            display: flex;
            flex-direction: column;
        }

        .popup input {
            padding: 10px;
            margin-bottom: 10px;
            border: 1px solid #ccc;
            border-radius: 5px;
        }

        .popup button[type="submit"] {
            padding: 10px 20px;
            background-color: #007bff;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
        }

        .popup button[type="submit"]:hover {
            background-color: #0056b3;
        }