body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(45deg, #000046, #1cb5e0);
    background-size: 400% 400%;
    animation: gradient 15s ease infinite;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

@keyframes gradient {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

.login-container {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    width: 300px;
    text-align: center;
    color: white;
}

/* logo 样式 */
.logo {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
    color: #fff;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
}

.login-container h1 {
    margin-bottom: 45px;
}

#login-form input {
    width: 93%;
    padding: 10px;
    margin-bottom: 20px;
    border: none;
    border-radius: 5px;
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    outline: none;
}

#login-form input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

#login-form button {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 5px;
    background-color: #1cb5e0;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#login-form button:hover {
    background-color: #159dc2;
}


.social-icons img {
    width: 30px;
    height: 30px;
    margin: 0 10px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.social-icons img:hover {
    transform: scale(1.2);
}

/* 新增左上角 logo 样式 */
.top-left-logo {
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 24px;
    font-weight: bold;
    color: white;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
    z-index: 2; /* 确保 logo 在其他元素之上 */
}