body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: Arial, sans-serif;
    background-color: #f4f7f6;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-container {
    padding: 20px;
}

.login-box {
    width: 360px;
    padding: 40px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.login-box h1 {
    color: #0b9275;
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 2em;
}

.login-box .subtitle {
    color: #888;
    margin-bottom: 30px;
}

.input-group {
    position: relative;
    margin-bottom: 20px;
}

.input-group i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #aaa;
}

.input-group input {
    width: 100%;
    padding: 12px 12px 12px 40px;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-sizing: border-box;
    font-size: 16px;
    transition: border-color 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: #0b9275;
}

#login-button {
    width: 100%;
    padding: 12px;
    background-color: #2c89eb;
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#login-button:hover {
    background-color: #0c6acf;
}

.error-message {
    color: #dd5260;
    margin-top: 15px;
    font-size: 14px;
    height: 20px; /* 占位防止布局跳动 */
}

@media (max-width: 480px) {
    .login-box {
        width: 100%;
        max-width: 320px;
        padding: 30px;
    }
}