header {
    position: sticky;
    width: 100%;
    left: 0;
    top: 0;
    z-index: 3;
    user-select: none;
    background-color: #f5f9ff;
    box-shadow: #dcdcdc 0 2px 10px;
}

header .navbar-container {
    width: 92%;
    margin: auto;
}

.navbar-container .title {
    display: inline-block;
    font-size: 28px;
    font-weight: bold;
    color: #000000;
    line-height: 2.6em;
}

.navbar-container .menu {
    float: right;
    display: inline-block;
}

.menu a:hover {
    text-decoration: none;
}

.menu .menu-item {
    line-height: 4em;
    margin-left: 2em;
    display: inline-block;
    font-size: 18px;
    color: #000000;
    transition: 0.15s;
    cursor: pointer;
}

.menu .menu-item:hover {
    color: red;
}

.menu .menu-item.active {
    border-bottom: 2px solid #000;
}

/* toggle */
.toggle {
    display: none;
}

.toggle-icon {
    padding: 1px;
    cursor: pointer;
    display: block;
}

.toggle-icon:hover {
    background-color: #11ff33;
}

.toggle-icon .toggle-line {
    width: 25px;
    height: 3px;
    margin: 5px;
    background-color: #000;
}

.search-icon {
    float: right;
    line-height: 4em;
    margin-left: 2em;
    font-size: 18px;
    color: #000000;
    transition: 0.15s;
    cursor: pointer;
}

.search-box {
    display: none;
    padding: 9px 0;
    width: 100%;
    position: absolute;
    z-index: 2;
    background: transparent;
}

.search-input {
    float: right;
    padding: 5.7px;
    border: 1px #c3bebe solid;
    border-radius: 5px;
    margin-right: 3px;
}

@media screen and (max-width: 1000px) {
    .menu .menu-item {
        display: block;
        margin-left: 0;
        padding-left: 1em;
        border-bottom: 1px solid #dcdcdc;
    }

    .menu .menu-item.active {
        border-bottom: 1px solid #dcdcdc;
        color: red;
    }

    .navbar-container .menu {
        display: none;
        float: none;
    }

    .navbar-container .title {
        padding-left: 0.5em;
        font-size: 25px;
    }

    header .navbar-container {
        width: 100%;
        max-width: 1300px;
        margin: auto;
    }

    .toggle {
        display: block;
        padding: 10px 15px;
        margin: 10px 1px 0 0;
        box-sizing: border-box;
        float: right;
    }

    .search-icon {
        float: none;
    }
}