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

body.dark {
    background: #1e1e1e;
    color: #ddd;
}

.login-box {
    background-color: white;
}

.login-box p {
    margin-top: 25px;
}

body.dark .login-box {
    background-color: #333333;
}

body.dark .login-box a {
    color: #ddd;
}

.login-box {
    padding: 50px 60px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    width: 400px;
}

h1 {
    text-align: center;
    font-size: 28px;
    margin-bottom: 30px;
}

label {
    display: block;
    margin-top: 15px;
    font-size: 16px;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 12px;
    margin-top: 6px;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 16px;
}

input[type="submit"] {
    margin-top: 30px;
    width: 100%;
    padding: 14px;
    background-color: #4285f4;
    color: white;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

input[type="submit"]:hover {
    background-color: #357ae8;
}

.send-code-btn {
    margin-top: 20px;
    width: 50%;
    border-radius: 6px;
    font-size: 14px;
}

.error {
    color: red;
    text-align: center;
    margin-bottom: 20px;
    font-weight: bold;
}

@media (max-width: 600px) {
    .login-box {
        padding: 25px 20px; /* 减少内边距，避免太挤 */
        border-radius: 8px;
        box-shadow: none; /* 小屏可以去掉阴影，显得简洁 */
    }

    h1 {
        font-size: 22px;
        margin-bottom: 20px;
    }

    label {
        font-size: 14px;
        margin-top: 10px;
    }

    input[type="text"],
    input[type="password"] {
        padding: 10px;
        font-size: 14px;
    }

    input[type="submit"] {
        padding: 12px;
        font-size: 14px;
        margin-top: 20px;
    }
}