.main {
    text-align: left;
    padding-top: 4rem;

}

.main .max_wraper {
    display: flex;
    gap: 4rem;
}

.catalog {
    width: 30rem;
    line-height: 3rem;
    color: #6A717F;
    border-right: .1rem solid #ECEBEB;

}

.catalog h5 {
    font-size: 1.6rem;
    font-weight: 600;
    color: #000;
}

.catalog li li {
    cursor: pointer;
}

.catalog li li:hover {
    color: blueviolet;
}

.catalog li li:hover::before {
    content: "👉 ";

}

.content {
    max-width: 80rem;
    color: #6A717F;
    height: 100vh;
    overflow-y: auto;
    padding-right: 4rem;
    padding-bottom: 4rem;
}

.content a {
    /* 下划线 */
    color: #6A717F;
    text-decoration: underline;
}

.content picture,
.content video {
    width: 100%;
    height: 28rem;
    margin-top: 2rem;
    display: block;
    background: #ECEBEB;
    border-radius: 1rem;
    overflow: hidden;
}

.content picture img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.content h1,
.content h2,
.content h3,
.content h4,
.content h5,
.content h6 {
    color: #000;
}

.content h2,
.content h3,
.content h4,
.content h5,
.content h6 {
    margin: 4rem 0 1rem 0;
}

.content div,
.content p {
    font-size: 1.4rem;
    line-height: 2.8rem;
}

.content .tips {
    background: var(--color-green);
    color: #fff;
    padding: 1rem;
    border-radius: 1rem;
    margin: 2rem 0;
}

.content .warning {
    background: #ffe5644d;
    color: #cd8819;
}

.content table {
    width: 100%;
    margin: 2rem 0;
    border-collapse: collapse;
    border-radius: 1rem;
}


.content table th,
.content table td {
    padding: 1rem;
    border: .2rem solid #ECEBEB;
}

.content table th {
    background: #ecebeb77;
}

.sidebar_tools {
    position: fixed;
    right: 4rem;
    bottom: 8rem;
    display: flex;
    flex-direction: column;
    gap: 1rem
}

.tool_item {
    width: 5rem;
    height: 5rem;
    background: #6A717F;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    cursor: pointer;
    opacity: .8;
}

.tool_item:hover {
    opacity: 1;
}