header {
    position: fixed;
    top:0;
    left:50%;
    transform:translateX(-50%);
    width:100vw;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: transform var(--anim-duration) var(--anim-easing);
}
header .header-bg {
    position: absolute;
    width:100%;
    height: 100%;
    top:0;
    left:0;
    background: transparent;
    z-index: -1;
    transition: background var(--anim-duration) var(--anim-easing);
    backdrop-filter: blur(10px);
}
.header-message {
    display: flex;
    align-items: center;
    justify-content: center;
    padding:var(--s5-8) var(--block-padding-x);
    background-color: var(--light-grey);
    flex: 1 0 100%;
    width: 100%;
    font-size: var(--s10-14);
    text-align: center;
}
.header-content {
    z-index: 1;
    max-width: var(--maxWidthPX);
    padding: var(--s5-8) var(--block-padding-x);
    justify-content: space-between;
    width:100%;
    display: flex;
    flex-direction: row;
    will-change: padding;
    transition: 
        padding var(--anim-duration) var(--anim-easing);
}
header.header-scrolled .header-content {
    padding: var(--s10-16) var(--block-padding-x);
}
.header-content > * {
    display:flex;
    flex-direction: row;

}
header .header-logo {
    width:clamp(100px, calc((200 / var(--maxWidth)) * 100vw), 200px);
    will-change: transform;
    transition: 
        transform var(--anim-duration) var(--anim-easing);
    display:flex;
    justify-content: center;
}
.header-nav-container,
.header-nav-container nav {
    display: flex;
    flex-direction: row;
    gap:var(--list-gap-med);
    justify-content: center;
    justify-items: center;
    align-items: center;
}
.header-nav-container nav.feature-nav {
    gap:var(--list-gap);
}
.header-nav-container a {
    color: var(--white);
    text-decoration: none;
    font-size: var(--s10-14);
    position: relative;
    z-index: 1;
}
.header-nav-container > .header-nav a {
    transition: color var(--anim-duration) var(--anim-easing);
    will-change: color;
}
.header-nav-container > .header-nav a.active {
    color: var(--red);
}
.header-nav-container > .header-nav a.active:hover {
    text-decoration: none;
}
.header-nav-container > .header-nav a::before,
.header-nav-container > .header-nav a::after {
    z-index: -1;
    position: absolute;
    top:50%;
    left:50%;
    width: calc(100% + var(--s10-14));
    height: calc(100% + (var(--s10-14) * 0.66));
    border-radius: var(--s1-3);
    content: "";
    transform: translate(-50%, -50%) scale(0.5);
    transition:
        opacity var(--anim-duration) var(--anim-easing),
        transform var(--anim-duration) var(--anim-easing);
    will-change: opacity, transform;
    opacity: 0;
    pointer-events: none;
}
.header-nav-container > .header-nav a.active::before,
.header-nav-container > .header-nav a.active::after {
    transform: translate(-50%, -50%) scale(1);
}
.header-nav-container > .header-nav a.active::before {
    background: var(--light-grey);
    opacity: 0.5;
}
.header-nav-container > .header-nav a.active::after {
    border: 0.5px solid var(--light-grey);
    opacity: 1;
}
header .btn {
    padding-right: var(--s10-16);
    padding-left: var(--s10-16);
    flex-grow: 1;
    min-width: calc((110 / var(--maxWidth)) * var(--maxWidthPX));
}
header .nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
    height: 35px;
}
.hamburger, .hamburger::before, .hamburger::after {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--white);
    position: relative;
    transition: all 0.3s;
    border-radius: 3px;
}
.hamburger::before, .hamburger::after {
    content: '';
    position: absolute;
    top: -8px;
    left: 0;
 }
.hamburger::after {
    top:auto;
    bottom: -8px;
}
.hamburger:hover {
    transform:scale(1.1);
}
.is-open .hamburger,
header.header-scrolled .is-open .hamburger {
    background: #fff0
}
.is-open .hamburger::before {
    transform: rotate(45deg);
    top: 0;
    background:var(--main-text-colour);
}
.is-open .hamburger::after {
    transform: rotate(-45deg);
    bottom: 0;
    background:var(--main-text-colour);
}

/* Header States */

header.header-hidden {
    transform: translateY(-100%) translateX(-50%);
}

header.header-scrolled .header-bg {
    background: var(--white);
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
    opacity: 0.95;
}
header.header-scrolled .header-logo {
    transform: translateY(0);
}

header.header-scrolled .header-nav-container a:not(.btn):not(.header-link.active) {
    color: var(--dark-grey);
}
header.header-scrolled .hamburger, 
header.header-scrolled .hamburger::before, 
header.header-scrolled .hamburger::after {
    background:var(--main-text-colour);
}
/* Mobile Nav State */
html.nav-open {
    overflow: hidden; /* Prevents background scroll when menu is open */
    position: relative;
    touch-action: none
}

@media(max-width:1080px){
    header .nav-toggle {
        display: block;
    }
    header .header-nav {
        position: fixed;
        top: 0;
        z-index: 1;
        right: -100%;
        height: 100vh;
        width: 90%;
        background: rgb(255 255 255 / .95);
        flex-direction: column;
        padding: 80px 0;
        will-change: right, opacity, transform, filter;
        transition: 
            right var(--anim-duration) var(--anim-easing),
            opacity var(--anim-duration) var(--anim-easing);
        overflow-y: auto;
        box-shadow: 0 0 10px rgb(0 0 0 / .15);
        opacity: 0;
    }
    header .header-nav a.header-link {
        color: var(--main-text-colour);
        font-size: var(--s18-22-min-768);
    }
    header .feature-nav {
        position: fixed;
        bottom: calc(-100vh + 100%);
        transform: translate(0vw, 0%);
        width: 100vw;
        left: 0%;
        padding: var(--s8-16);
        will-change: transform, bottom;
        transition: 
            bottom var(--anim-duration) var(--anim-easing),
            transform var(--anim-duration) var(--anim-easing);
    }
    header .feature-nav > * {
        display: flex;
        width: 100%;
        max-width: 300px;
    }
    header.header-hidden .feature-nav {
        transform: translate(0vw, 100%);
        bottom: calc(-100vh - 100%);
    } 
}

header .header-nav.nav-active {
    right: 0%;
    opacity: 1;
}