body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 400px;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
}

.form-group {
    width: 100%;
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 15px;
    font-size: 18px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 15px;
    font-size: 18px;
    background-color: #28a745;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #218838;
}

.copy-button {
    padding: 8px 16px;
    font-size: 14px;
    margin-left: 0px; /* 增大与注册码的距离 */
}

p {
    text-align: center;
    margin: 5px 0; /* 调整段落间距 */
}

.error {
    color: red;
    text-align: center;
    margin-top: 20px;
}

.resource-link {
    margin-top: 5px; /* 缩小与上方内容的距离 */
}

.resource-link a {
    color: #007bff;
    text-decoration: none;
}

.resource-link a:hover {
    text-decoration: underline;
}

/* 媒体查询 */
@media (max-width: 600px) {
    .container {
        padding: 15px;
    }

    h1 {
        font-size: 24px;
    }

    label {
        font-size: 14px;
    }

    input[type="text"],
    input[type="password"] {
        padding: 12px;
        font-size: 16px;
    }

    button {
        padding: 12px;
        font-size: 16px;
    }

    .copy-button {
        padding: 6px 12px;
        font-size: 12px;
    }
}