.header {
    width: 100%;
    padding: 15px var(--padding-x-sm) 10px;
    z-index: 9;
    position: relative;
    font-size: var(--size-14);
    background-color: var(--color-header);
}

.header > .menu {
    display: flex;
    flex-direction: row;
}
.header > .menu > .left,
.header > .menu > .right,
.header > .menu > .middle {
    display: flex;
    align-items: center;
}
.header > .menu > .left {
    flex: 1;
}
.header > .menu > .right {
    flex: 1;
    justify-content: flex-end;
}
.header > .menu > .middle {
    flex: 4;
    justify-content: center;
}
.header > .menu > .right > .identity {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--rounded-circular);
    background-color: var(--color-base);
}
.header > .menu > .left > .logo {
    display: none; /* hide logo in mobile devices */
}

/* Navigation Menu */
.header > .menu > .left > nav {
    display: none;
    top: 58px;
    left: 13px;
    right: 13px;
    padding: 5px 0;
    position: absolute;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border-radius: var(--rounded-lg);
    background-color: var(--color-white);
}
.header > .menu > .left > nav.open {
    display: block;
}
.header > .menu > .left > nav > ul {
    margin: 0;
    padding: 0;
}
.header > .menu > .left > nav > ul > li {
    margin: 0;
    padding: 0;
    list-style: none;
}
.header > .menu > .left > nav > ul > li a {
    color: var(--color-grey-500);
    display: block;
    padding: 12px 20px;
    font-weight: 500;
    text-decoration: none;
}
.header > .menu > .left > nav > ul > li a.active,
.header > .menu > .left > nav > ul > li a:active {
    background-color: var(--color-base);
}
.header > .menu > .left > nav > ul > li a i {
    color: var(--color-grey-200);
    margin-left: 5px;
}

/* Sub-navigation Menu */
.header > .menu > .left > nav > ul > li > .submenu > ul {
    padding: 0;
    margin: 0 0 0 30px;
    list-style: none;
}
.header > .menu > .left > nav > ul > li > .submenu > ul > li a {
    padding: 10px;
    font-size: var(--size-14);
}

.header > .content {
    color: var(--color-white);
    padding: 20px 0 5px;
}
.header > .content > h1 {
    font-size: var(--size-16);
    font-weight: 700;
}

/**
 * Override hamburgers component by Johnathan Suh.
 * 
 * @link https://github.com/johnsuh/hamburgers
 * @author Johnathan Suh <hello@johnsuh.com>
 * @override Hamburgers Package by Johnathan Suh
 **/
.hamburger {
    padding: 0 !important;
}
.hamburger > .hamburger-box {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.hamburger > .hamburger-box > .hamburger-inner,
.hamburger > .hamburger-box > .hamburger-inner::before,
.hamburger > .hamburger-box > .hamburger-inner::after {
    width: 24px;
    height: 2px;
    background-color: var(--color-white) !important;
}
.hamburger > .hamburger-box > .hamburger-inner::before {
    top: -8px;
}
.hamburger > .hamburger-box > .hamburger-inner::after {
    bottom: -8px;
}

/* Customize look for tablets and larger devices (e.g: iPad) */
@media (min-width: 640px) {
    .header {
        font-size: var(--size-16);
        padding-top: 10px;
    }
    .header > .menu > .middle,
    .header > .menu > .left > .hamburger {
        display: none; /* hides hamburger button and middle section */
    }
    .header > .menu > .left > .logo {
        display: block;
    }
    .header > .content {
        padding: 30px 0 10px;
    }
    .header > .content > h1 {
        font-size: var(--size-18);
    }
    .header.overlap > .content {
        padding: 30px 0 60px;
    }

    /* The main menu is restyled for larger devices */
    .header > .menu > .left > nav {
        top: 0;
        left: 0;
        display: block;
        overflow: visible;
        position: relative;
        box-shadow: none;
        padding-left: 25px;
        background-color: transparent;
    }
    .header > .menu > .left > nav > ul {
        display: flex;
        position: relative;
    }
    .header > .menu > .left > nav > ul > li {
        padding: 0 4px;
        z-index: 10;
    }
    .header > .menu > .left > nav > ul > li > a {
        color: var(--color-grey-300);
        padding: 10px 13px;
        display: flex;
        align-items: center;
        border-radius: var(--rounded-md);
    }
    .header > .menu > .left > nav > ul > li > a.active {
        cursor: default;
        color: var(--color-white);
        background-color: var(--color-grey-700);
    }
    .header > .menu > .left > nav > ul > li > a.active i {
        color: var(--color-grey-200);
    }
    .header > .menu > .left > nav > ul > li > a:not(.active):active {
        color: var(--color-grey-500);
    }
    .header > .menu > .left > nav > ul > li a:not(.active):active i {
        color: var(--color-grey-600);
    }
    .header > .menu > .left > nav > ul > li > a i {
        color: var(--color-grey-400);
    }

    /* Submenu */
    .header > .menu > .left > nav > ul > li:hover > .submenu {
        display: block;
        z-index: 1;
    }
    .header > .menu > .left > nav > ul > li:hover > a:not(.active),
    .header > .menu > .left > nav > ul > li:active > a:not(.active) {
        background-color: var(--color-grey-900);
    }
    .header > .menu > .left > nav > ul > li > .submenu {
        top: 0;
        display: none;
        position: absolute;
        padding-top: 45px;
    }
    .header > .menu > .left > nav > ul > li > .submenu:hover {
        display: block;
    }
    .header > .menu > .left > nav > ul > li > .submenu > ul {
        width: 200px;
        overflow: hidden;
        margin-left: 0;
        box-shadow: var(--shadow-xl);
        border-radius: var(--rounded-lg);
        background-color: var(--color-white);
    }
    .header > .menu > .left > nav > ul > li > .submenu > ul > li > a {
        padding: 15px;
    }
    .header > .menu > .left > nav > ul > li > .submenu > ul > li > a:hover {
        background-color: var(--color-base);
    }
    .header > .menu > .left > nav > ul > li > .submenu > ul > li > a:active {
        filter: brightness(0.99);
    }
}

@media (min-width: 1280px) {
    .header {
        padding-left: var(--padding-x-lg);
        padding-right: var(--padding-x-lg);
    }
    .header > .content {
        padding: 40px 0 15px;
    }
    .header > .content > h1 {
        font-size: var(--size-20);
    }
    .header.overlap > .content {
        padding: 40px 0 65px;
    }
}

@media (min-width: 1440px) {
    .header {
        padding-left: var(--padding-x-xl);
        padding-right: var(--padding-x-xl);
    }
    .header > .content > h1 {
        font-size: var(--size-24);
        font-weight: 500;
    }
}