* {
    margin: 0;
    padding: 0;
}
.header {
    width: 99%;
    height: 90px;
    background-color: #333;
    border-radius: 12px;
    margin: 0 auto;
    color: #fff;
    font-size: 18px;
}        
.header h2 {
    text-align: center;
    padding-top: 18px;
}
.header p {
    float: right;
    margin-right: 15px;
}
.header span {
        margin-right: 15px;
}
.header button {
    float: right;           
}
.main {
    width: 99%;
    height: auto;
    margin: 20px auto;
}
.nav {
    text-align: center;
    width: auto;
    height: 35px;
    line-height: 1.8;
    color: #00ff4c;
    /* display: block; */
}
.nav ul {
    display: flex;
    justify-content: center;
    gap: 4px;
}
.nav li {
    width: 90px;
    height: 35px;
    list-style-type: none;
    background-color: #333;
    border: 1px solid #fff;
    border-radius: 18px;  
}
.nav a {
    font-size: 18px;
    color: #fff;
    text-decoration: none;         
}
.nav li:nth-child(4) {           
    width: 120px;
}
.nav li:first-child {
    background-color: #000;
}
.search {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 45px 0;
    width: 100%;
    transform: translateY(10px);
}
.search input[type="text"] {
    width: 40%;
    height: 45px;
    line-height: 45px;
    font-size: 18px;
    border-right: none;
    background-color: #fff;
    border-radius: 24px 0 0 24px;
    border: 0.5pt solid #888;
    padding: 0 10px;
    letter-spacing: 2px;
    box-sizing: border-box;
} 
.search input[type="text"]:focus {
    background-color: #e8f8eb;
    border:0.5pt solid #888;
    outline: none;
}
.search button {
    height: 45px;          
    padding: 0 18px;
    font-size: 18px;
    color: #666;
    border: 0.5pt solid #888;
    border-left: none;
    border-left-color: transparent;
    border-radius: 0 18px 18px 0;
    cursor: pointer;
    box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
}   
.menu {
    width: 18%;
    height: 630px;
    border-radius: 12px;
    background-color: #333;
    margin: 15px auto;
    float: left;
    margin-top: 60px;
}
.menu dt {
    height: 65px;
    line-height: 65px;
    font-size: 20px;
    color: #fff;
    text-align: center;
    border-radius: 12px;
    border: 5px solid #fff;
    background-color: #000;
    margin-bottom: 25px;
}
.menu dd {
    border-bottom: 0.01pt solid #555;
    width: 100%;
    height: 40px;
    line-height: 40px;
}
.menu a {
    display: block;
    color: #fff;
    text-decoration: none;
    width: 100%;
    height: 40px;
    line-height: 40px;
    font-size: 18px;
    padding: 0 20px;
    font-weight: 400;
    box-sizing: border-box;
}
.menu a:hover {
    background-color: #fff;
    color: #999;
    transform: translateY(-1px);
    border: 0.01pt solid #999;
}
.page-box {
    margin-top: 40px;
    text-align: center;
}
.info_box { 
    width: 60%;
    height: 630px;
    border: 1px solid #888;
    float: right;
    margin-right: 20%;
    margin-top: 60px;
}