/* 字体 */

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", "Segoe UI", "Microsoft Yahei", Helvetica, Arial, "Apple Color Emoji", sans-serif;
    font-size: 16px;
}

p {
    line-height: 1.15;
}

h2 {
    font-size: 1.85em;
}


/* 顶部 */

header {
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100px;
    padding: 15px 30px;
    box-sizing: border-box;
    z-index: 10;
}


/* Logo */

.logo>img {
    height: 70px;
    width: auto;
    max-width: 100%;
}


/* 导航栏 */

nav {
    position: fixed;
    top: 19px;
    right: 19px;
    z-index: 99;
    padding: 19px 0px;
}

nav>a {
    display: inline-block;
    width: 32px;
    height: 32px;
    margin: 0px 7px;
}


/* 搜索按钮 */

#search span,
#search span::before,
#search span::after {
    transition: all 200ms ease-in-out;
}

#search {
    opacity: .5;
}

#search:hover {
    opacity: 1;
}

.active>nav>#search>span {
    display: none;
}

#search span::before {
    content: '';
    position: absolute;
    width: 15px;
    height: 15px;
    margin-top: 5px;
    margin-left: 5px;
    border: 2px solid;
    border-radius: 50%;
    z-index: 100;
}

#search span::after {
    content: '';
    position: absolute;
    width: 11px;
    height: 17px;
    margin-top: 10px;
    margin-left: 24px;
    border-bottom: 2px solid;
    transform: rotate(50deg);
    z-index: 100;
}


/* 菜单按钮 */

#toggle span,
#toggle span::after,
#toggle span::before {
    content: '';
    position: absolute;
    width: 27px;
    height: 2px;
    transition: all 200ms ease-in-out;
}

#toggle {
    opacity: .5;
}

#toggle:hover {
    opacity: 1;
}

#toggle span {
    margin-top: 16px;
    margin-left: 3px;
}

#toggle span::after {
    top: -9px;
}

#toggle span::before {
    top: 9px;
    width: 17px;
}


/* 菜单按钮动画 */

.active>nav>#toggle>span::after {
    top: 0px!important;
    transform: rotate(45deg);
}

.active>nav>#toggle>span::before {
    top: 0px!important;
    transform: rotate(-45deg);
    width: 27px!important;
}


/* 主体 */

main {
    display: flex;
    align-items: center;
    justify-content: center;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 90vh;
}

.about>main>.container {
    display: flex;
}

.container {
    display: none;
    margin-top: 70px;
    width: 1300px;
    height: 70%;
    z-index: 0;
}

article {
    padding: 12px 26px;
}

article>div{
    margin-left: 17px;
}

@media screen and (max-width:1367px) {
    .container {
        flex-wrap: wrap;
        width: 90%;
        height: 70%;
    }
    .left {
        width: 100%;
    }
    .right {
        width: 100%;
    }
}

@media screen and (min-width:1367px) {
    .left {
        flex: 0 0 30%;
        max-width: 310px;
    }
    .right {
        flex: 0 0 70%;
        max-width: 990px;
    }
}

.left {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.logo-title>img {
    width: auto;
    height: 210px;
    border-radius: 50% 50%;
}

.links {
    display: flex;
    justify-content: space-around;
}

.links>a {
    width: 28px;
    height: 28px;
    margin: 12px 5px;
}


/* 菜单栏 */

menu {
    position: fixed;
    top: 0px;
    right: -300px;
    height: 100vh;
    width: 300px;
    margin: 0 0;
    padding: 100px 50px;
    box-sizing: border-box;
    transition: all 200ms ease-in-out;
    z-index: 10;
}

.active>menu {
    right: 0px;
}

ul,
li {
    list-style: none;
}

ul {
    padding: 0px 50px;
}

li {
    display: block;
    padding: 5px 0px;
    margin-bottom: 21px;
}

a {
    text-decoration: none;
}

a:hover {
    opacity: .7;
}


/* 页脚 */

footer {
    position: fixed;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    bottom: 0px;
    left: 0px;
    width: 100%;
    height: 64px;
    padding: 26px 0px;
    z-index: 9;
}

.about>footer {
    display: none;
}

footer p {
    line-height: 1.175;
    margin: 3px 0px;
}