@media only screen and (max-width: 767px) {
    #header .header-top .mobile-center {
        display: flex;
        justify-content: center;
    }
}

#header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100000;
    background: #ffffff;
}

#header .header-top {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.header-top .search {
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-top .search .btn {
    background: #f5f7fa;
    color: #909399;
    border: 1px solid #dcdfe6;
    padding: 0 20px;
    white-space: nowrap;
    height: 40px;
    display: flex;
    align-items: center;
    font-size: 14px;


}

.header-top .search .btn img {
    height: 18px;
    width: 18px;
}

.header-top .search input {
    height: 42px;
    border: 1px solid #dcdfe6;
    border-right: none;
    border-left: none;
    font-size: 14px;
    width: 30vh;
    padding-left: 10px;
    box-sizing: border-box;
    outline: none;
}

.header-top .search .btn .icon {
    height: 14px;
    width: 14px;
    margin-right: 5px;
}

#header .header-bottom {
    background: #1fb37c;
    height: 50px;
    display: flex;
    justify-content: center;
}

.header-bottom .nav {
    line-height: 50px;
    display: flex;
    justify-content: center;
}

.header-bottom .nav .item {
    text-align: center;
}

.header-bottom .nav .active {
    background: red !important;
}

.header-bottom .nav .item a {
    text-decoration: none;
    color: #ffffff;
    display: block;
    font-size: 15px;
}

.header-bottom .nav .item:hover {
    background: #198f63;
}

.header-bottom .nav .active {
    background: #198f63 !important;
}

.sidebar-btn {
    position: fixed;
    left: 15px;
    bottom: 30px;
    color: #fff;
    font-weight: bold;
    font-size: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 55px;
    height: 55px;
    background-color: rgb(0, 122, 255);
    border-radius: 45px;
    box-shadow: 0 1px 5px 2px rgba(0, 0, 0, .3);
}

.sidebar-mask {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100vw;
    height: 100vh;
    display: none;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.95);
    display: flex;
    flex-direction: column;
}

.sidebar.active {
    transform: translateX(0);
}

.sidebar-header {
    padding: 25px 20px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-title {
    color: white;
    font-size: 24px;
    font-weight: 300;
    letter-spacing: 1px;
}

.nav-menu {
    flex: 1;
    padding: 20px 0;
    overflow-y: auto;
}

.nav-item {
    display: block;
    color: rgba(255, 255, 255, 0.85);
    padding: 18px 25px;
    text-decoration: none;
    font-size: 18px;
    transition: all 0.2s ease;
    border-left: 4px solid transparent;
}

.nav-item.active {
    background-color: rgba(102, 126, 234, 0.1);
    color: white;
    border-left: 4px solid #667eea;
}