body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5; /* 浅灰色背景 */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.login-container {
    background-color: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    width: 400px; /* 稍微增加宽度 */
    text-align: center;
}

h1 {
    color: #333;
    margin-bottom: 30px;
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

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

input[type="text"],
input[type="password"] {
    width: calc(100% - 24px);
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 16px;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

input[type="text"]:focus,
input[type="password"]:focus {
    border-color: #007bff;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.login-button {
    background-color: #007bff;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 18px;
    width: 100%;
    transition: background-color 0.3s ease;
    margin-top: 15px;
}

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

.options {
    margin-top: 25px;
    display: flex;
    justify-content: space-between;
    color: #777;
    font-size: 0.9em;
}

.options a {
    color: #007bff;
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}

.options a:hover {
    text-decoration: underline;
    color: #0056b3;
}