:root {
    --content-bg-colour: oklch(1 0 0);
    --default-bg-colour: oklch(0.9 0 0);
    --text-color: oklch(0.18, 0.03, 300);

    --default-border-colour: #959595;
    --border-colour-dark: oklch(from var(--default-border-colour) calc(l * 0.9) c h);
    --border-colour-light: oklch(from var(--default-border-colour) calc(l * 1.1) c h);

    --header-colour-dark: oklch(from var(--header-colour) calc(l * 0.9) c h);
    --header-colour-light: oklch(from var(--header-colour) calc(l * 1.1) c h);
    --header-border-width: 6px;

    --content-width: clamp(50vw, 900px, 90vw);
}

.darkmode {
    --content-bg-colour: oklch(1 0 0);
    --default-bg-colour: oklch(0.9 0 0);
    --text-color: oklch(0.18, 0.03, 300);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

@font-face {
    font-family: "04B_08";
    src: url("/assets/fonts/04B_08.woff") format("woff");
}

body {
    background-color: var(--default-bg-colour);
}

main {
    width: var(--content-width);
    margin: 0 auto;
    padding: 1rem;

    background-color: var(--content-bg-colour);
    font-family: "Segoe UI", sans-serif;
}

#header {
    width: 100%;
}

#open-sidebar-button {
    display: none;
    margin: 5vh auto 0;
    width: var(--content-width);

    border: solid var(--header-border-width);
    border-color: var(--header-colour-light) var(--header-colour-light) var(--header-colour-dark) var(--header-colour-dark);
    border-bottom: none;
    background-color: var(--header-colour);

    cursor: pointer;
    padding: 0.25em 0.5em;
    color: #fff;
    font-family: "04B_08";
    font-size: 16px;
    font-weight: 100;
    -webkit-font-smoothing: none;
}

#open-sidebar-button:active {
    border-color: var(--header-colour-dark) var(--header-colour-dark) var(--header-colour-light) var(--header-colour-light);
    background-color: var(--header-colour-dark);
}

#header-content {
    background-color: var(--header-colour);
    border: solid var(--header-border-width);
    border-color: var(--header-colour-light) var(--header-colour-light) var(--header-colour-dark) var(--header-colour-dark);
    border-bottom: none;

    color: #fff;
    font-family: "04B_08";
    font-size: 16px;
    font-weight: 100;
    font-smooth: none;
    -webkit-font-smoothing: none;
}

.navbar {
    max-width: 70%;
}

.navbar ul {
    height: 100%;
    display: flex;
    list-style: none;
}

.navbar li {
    background-color: var(--header-colour-dark);
    flex: 1 1 auto;
}

#close-sidebar-button {
    display: none;
    cursor: pointer;
    width: 100%;
    border: none;
    text-align: left;
    background-color: #c93f3f;
    padding: 0.25em 0.5em;

    color: #fff;
    font-family: "04B_08";
    font-size: 16px;
    font-weight: 100;
}

#secret-sidebar-button {
    display: none;
    background-color: var(--header-colour);
    color: var(--header-colour);
    cursor: default;
    padding: 0.25em 0.5em;
}

.navbar li.active {
    background-color: var(--content-bg-colour);
    border-right-color: var(--content-bg-colour);

    a {
        color: var(--header-colour);
    }
}

.navbar a {
    display: block;
    padding: 0.25em 0.5em;
    text-decoration: none;
    text-transform: uppercase;
    color: #fff;
}

#header-titlebar {
    padding: 0 0.5em 0 0.5em;
}

a {
    color: var(--header-colour);
}

@media screen and (width > 570px) {
    #header-content {
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: nowrap;

        margin: 5vh auto 0;
        position: sticky;

        width: var(--content-width);
    }

    li:first-child {
        flex: none;
    }

    .navbar li:not(:last-child) {
        border-right: 1px solid var(--header-colour-light);
    }
}

@media screen and (max-width: 1000px) {
    #header-titlebar {
        display: none;
    }

    .navbar {
        max-width: none;
        width: 100%;
    }
}

@media screen and (max-width: 570px) {
    #header button {
        display: block;
    }

    #header-content {
        height: 100vh;
        width: min(10em, 100%);
        flex-direction: column;
        justify-content: space-between;
        border-style: none none none solid;

        position: absolute;
        inset: unset;
        top: 0;
        right: 0;
        margin: 0;

        transform: translateX(100%);
        transition: all 200ms ease-out allow-discrete;
    }

    #header-content::backdrop {
        background-color: transparent;
        transition: all 200ms allow-discrete;
    }

    #header-content:popover-open {
        display: flex;
        transform: translateX(0);
    }

    #header-content:popover-open::backdrop {
        background-color: rgba(0, 0, 0, 0.25);
    }

    @starting-style {
        #header-content:popover-open {
            transform: translateX(100%);
        }

        #header-content::backdrop {
            background-color: transparent;
        }
    }

    #close-sidebar-button,
    #secret-sidebar-button {
        display: block;
    }

    .links-container {
        flex-direction: column;
    }

    #header-titlebar {
        display: block;
        font-size: 8px;
    }
}