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

body {
    font-family:"微软雅黑", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

h1 {
    font-size: 28px;
    margin-bottom: 30px;
    text-align: center;
    padding-top:30px;
}
.title1,.title2,.title3,.title4{
    font-weight:900;
}

div[class^="li-"] {
    background: #fff;
    padding: 20px;
}

.title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #1a1a1a;
}

p {
    font-size: 14px;
    line-height: 1.8;
    padding-bottom:10px;
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
    body {
        padding: 15px;
    }

    h1 {
        font-size: 24px;
        margin-bottom: 20px;
        padding-top:20px;
    }

    .title {
        font-size: 18px;
    }

    .p, .p1 {
        font-size: 14px;
    }

    div[class^="li-"] {
        padding: 15px;
        margin-bottom: 20px;
    }
}

@media screen and (max-width: 480px) {
    body {
        padding: 10px;
    }

    h1 {
        font-size: 20px;
        margin-bottom: 15px;
        padding-top:20px;
    }

    .title {
        font-size: 16px;
        margin-bottom: 10px;
    }

    .p, .p1 {
        font-size: 14px;
        line-height: 1.6;
    }

    div[class^="li-"] {
        padding: 12px;
        margin-bottom: 15px;
    }
}