* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

@font-face {
    font-family: 'YaHei';
    src: url('./yahei.otf');
}

@font-face {
    font-family: 'YaHei-light';
    src: url('./yahei-light.otf');
}

html {
    font-size: 12px;
    height: 100%;
    font-family: 'YaHei';
}

body {
    margin: 0;
    height: 100%;
    width: 100%;
}

a {
    text-decoration: none !important;
}

h1, h2, h3 {
    font-weight: normal;
}

/* text: 核心功能 */
.light-strong-title span {
    font-family: YaHei-light;
}

/* header */
header {
    height: 80px;
    width: 100%;
    background-color: rgb(34, 40, 52);
    display: flex;
    flex-flow: row nowrap;
    justify-content: space-between;
    align-items: center;
    padding: 0 200px;
    border-bottom: 1px solid rgb(62, 68, 78);
    z-index: 2;
    position: relative;
}

header > nav > a {
    font-size: 16px;
    color: gray;
    padding: 8px 20px;
    -webkit-border-radius: 14px;
    -moz-border-radius: 14px;
    border-radius: 14px;
    margin: 0 10px;
}

header > nav > a.active {
    color: white;
    background-color: rgb(87, 182, 141);
}

/* footer */
footer {
    background-color: rgb(34, 40, 52);
}

footer > nav {
    display: flex;
    flex-flow: row nowrap;
    justify-content: space-between;
    padding: 40px 0;
    border-bottom: 1px solid rgb(62, 68, 78);
}

footer > nav > a {
    color: #788498;
}

footer > p {
    text-align: center;
    color: #788498;
    padding: 20px 0;
    margin: 0;
}