* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", "SimHei", sans-serif;
    color: #000000;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}


.background-image {
    position: fixed; 
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1; 
    opacity: 0.5; 
}

.background-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative; 
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 20px; 
    position: relative; 
    z-index: 2; 
}

.logo img {
    max-height: 180px; 
    max-width: 100%;
    position: relative;
    z-index: 2;
    display: block; 
    margin-left: auto;
    margin-right: auto;
}

main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 50px 0;
    position: relative; 
    z-index: 1;
}

.content {
    text-align: center;
    position: relative; 
    z-index: 1;
}

.title {
    font-size: 120px;
    margin-bottom: 30px;
    font-weight: bold;
    letter-spacing: 2px;
}

.slogan {
    font-size: 48px;
    margin-top: 20px;
    letter-spacing: 1px;
    position: relative;
    padding-bottom: 20px;
}

.slogan::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background-color: #ff5722;
}

footer {
    margin-top: auto;
    padding: 20px 0;
    text-align: center;
}

.beian {
    font-size: 36px;
}

.beian a {
    color: #666;
    text-decoration: none;
    transition: color 0.3s;
}

.beian a:hover {
    color: #333;
    text-decoration: underline;
}


@media (max-width: 768px) { 
    .title {
        font-size: 60px; 
        margin-bottom: 20px;
    }

    .slogan {
        font-size: 24px; 
        padding-bottom: 15px;
    }
    .slogan::after {
        width: 70px;
        height: 2px;
    }

    .logo img {
        max-height: 100px; 
    }

    .beian {
        font-size: 16px; 
    }

    .container {
        padding: 15px; 
    }

    main {
        padding: 30px 10px; 
    }
}

@media (max-width: 480px) { 
    .title {
        font-size: 50px; 
        margin-bottom: 15px;
    }

    .slogan {
        font-size: 30px; 
        padding-bottom: 10px;
    }
    .slogan::after {
        width: 50px;
        height: 2px;
    }

    .logo img {
        max-height: 100px; 
    }

    .beian {
        font-size: 22px; 
    }
    .container {
        padding: 10px; 
    }
}