body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-image: url('../img/background.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

.container {
    display: flex;
    width: 70%;
    background-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    border-radius: 10px;
}

.left-side {
    flex: 1;
    padding: 20px;
}

.left-side h1 {
    margin-bottom: 20px;
    color: #333;
}

.left-side button {
    display: block;
    width: 200px;
    margin-bottom: 15px;
    padding: 10px;
    font-size: 16px;
    color: white;
    background-color: #007bff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-align: left;
}

.left-side button:hover {
    background-color: #0056b3;
}

.left-side a {
    color: #007bff;
    text-decoration: none;
    display: inline-block;
    margin-top: 20px;
    font-size: 16px;
}

.left-side a:hover {
    text-decoration: underline;
}

.right-side {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.right-side img {
    max-width: 100%;
    border-radius: 10px;
}
/* 遮罩层 */
#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7); /* 半透明黑色背景 */
    z-index: 999;
    display: none; /* 默认隐藏 */
}

/* 弹窗样式 */
.popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
    background: white;
    padding: 20px;
    border-radius: 15px; /* 圆角 */
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.8);
    text-align: center;
    z-index: 1000;
    border: 5px solid #ff4500; /* 红色边框，让它更加突出 */
    display: none; /* 默认隐藏 */
}

/* 关闭按钮 */
.close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    color: #666;
}

.close-btn:hover {
    color: black;
}

/* 按钮美化 */
.popup-content button {
    background: #ff4500; /* 亮红色 */
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: 0.3s;
}

.popup-content button:hover {
    background: #d63000; /* 深红色 */
}