.header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 12px 20px;
    padding: 12px 0 10px;
    color: var(--text);
}

.site-header,
.sun-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--chrome-bg);
    border-bottom: 1px solid var(--chrome-line);
}

.sun-header {
    position: relative;
}

body.nav-open .site-header,
body.nav-open .sun-header {
    z-index: 1300;
}

.header-brand {
    justify-self: start;
    display: flex;
    align-items: center;
    min-width: 0;
    text-decoration: none;
    color: inherit;
}

.header-logo {
    display: block;
    height: 2.5rem;
    width: auto;
    max-width: 100%;
    object-fit: contain;
    object-position: left center;
}

body:not([data-theme="dark"]) .header-brand .header-logo:last-child,
body[data-theme="dark"] .header-brand .header-logo:first-child {
    display: none;
}

.header-col-nav {
    justify-self: center;
    display: flex;
    align-items: center;
    gap: 1.35rem;
}

.header-theme {
    justify-self: end;
    display: flex;
    align-items: center;
    gap: 4px;
}

.header-menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    padding: 0;
    border: none;
    border-radius: 999px;
    background: transparent;
    color: var(--text);
    cursor: default;
}

.header-theme-switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    margin: 0;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--text);
    cursor: pointer;
}

.header-theme-switch:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.header-theme-track {
    position: relative;
    box-sizing: border-box;
    width: 84px;
    height: 40px;
    border: 1px solid var(--chrome-line);
    border-radius: 999px;
    background: color-mix(in srgb, var(--text) 8%, var(--page-bg));
    transition: background-color 180ms ease-out, border-color 180ms ease-out;
}

.header-theme-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: color-mix(in srgb, var(--text) 22%, var(--page-bg));
    transition: transform 180ms ease-out, background-color 180ms ease-out;
}

body:not([data-theme="dark"]) .header-theme-thumb {
    transform: translateX(44px);
    background: rgb(255, 255, 255);
}

.header-theme-icon {
    position: absolute;
    top: 50%;
    width: 18px;
    height: 18px;
    margin-top: -9px;
    color: var(--text-muted);
    pointer-events: none;
    transition: color 180ms ease-out;
}

.header-theme-moon {
    left: 11px;
}

.header-theme-sun {
    right: 11px;
}

body[data-theme="dark"] .header-theme-moon,
body:not([data-theme="dark"]) .header-theme-sun {
    color: var(--text);
}

.header-theme-switch::after {
    content: attr(data-tip);
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    z-index: 1200;
    padding: 4px 8px;
    border-radius: 8px;
    background: var(--text);
    color: var(--panel-bg);
    font-size: 12px;
    line-height: 1.2;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
}

.header-theme-switch:focus-visible::after {
    opacity: 1;
}

@media (hover: hover) and (pointer: fine) {
    .header-theme-switch:hover::after {
        opacity: 1;
    }
}

@media (max-width: 960px) {
    .header-theme-switch {
        height: 44px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .header-theme-track,
    .header-theme-thumb,
    .header-theme-icon {
        transition: none;
    }
}

.header-menu-btn {
    display: none;
    cursor: pointer;
}

.header-nav-backdrop {
    display: none;
}

.navbar-element {
    text-align: center;
}

.navbar-element .link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 100;
    font-size: 16px;
}

.navbar-element .title {
    position: relative;
    display: inline-block;
}

.navbar-element .link:hover {
    color: var(--text);
}

.navbar-active .link,
.navbar-active .link:hover {
    color: var(--text);
}

.navbar-active .title::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -6px;
    height: 1px;
    background: var(--accent);
}

.navbar-element.in-progress .link,
.navbar-element.in-progress .link:hover {
    color: var(--text-muted);
    pointer-events: none;
}

@media (max-width: 960px) {
    .header {
        grid-template-columns: 1fr auto;
    }

    .header-menu-btn {
        display: inline-flex;
    }

    body.nav-open .header-theme {
        position: relative;
        z-index: 2;
    }

    .header-col-nav {
        display: none;
    }

    body.nav-open .header-nav-backdrop {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 50%;
        height: 100%;
        z-index: 1;
    }

    body.nav-open .header-col-nav {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        gap: 1.25rem;
        position: fixed;
        top: 0;
        right: 0;
        width: 50%;
        height: 100%;
        z-index: 1;
        box-sizing: border-box;
        margin: 0;
        padding: 4.5rem 1.5rem 1.5rem;
        background: var(--panel-bg);
    }
}