@import url("fonts.css");

:root {
    --background-color: #fafafa;
    --foreground-color: #212121;

    --highlighted-background-color: #fffde7;

    --glassy-background-color: #fafafadf;
}

@media screen and (prefers-color-scheme: dark) {
    :root {
        --background-color: #212121;
        --foreground-color: #fafafa;

        --highlighted-background-color: #424242;

        --glassy-background-color: #212121df;
    }
}

html {
    width: 100%;
    height: 100%;

    background-color: var(--background-color);
    color: var(--foreground-color);

    font-family: var(--font-content);
}

body {
    margin: auto;

    display: flex;
    flex-direction: column;

    /* position: relative; */

    width: 100%;
    max-width: 1024px;

    min-height: 100%;

    margin-top: 64px;

    &::before {
        content: "";

        display: block;
        position: fixed;

        pointer-events: none;

        inset: 0;

        z-index: 1000;

        width: 100%;
        max-width: 1024px;
        margin: auto;

        border-left: solid 1px var(--foreground-color);
    }
}

header {
    display: flex;

    position: fixed;
    top: 0;
    z-index: 2;

    &:before {
        content: "";

        display: block;
        position: fixed;

        inset: 0;
        height: 64px;

        pointer-events: none;
        z-index: -1;

        background-color: var(--glassy-background-color);
        backdrop-filter: blur(8px);
    }

    &:after {
        content: "";

        display: block;
        position: fixed;

        pointer-events: none;

        inset: 0;

        height: 64px;

        border-bottom: solid 1px var(--foreground-color);
    }

    #logo {
        text-decoration: none;
        color: var(--foreground-color);
        font-family: var(--font-heading);

        line-height: 64px;
        font-size: 1.5rem;

        &::before {
            content: "";

            display: inline-block;
            background-color: var(--foreground-color);

            width: 64px;
            height: 64px;

            float: left;

            mask-image: url(../img/logo-black.svg);
            mask-size: 100% 100%;
        }
    }

    nav {
        flex: 1;

        menu {
            display: flex;
            height: 100%;
            justify-content: flex-end;
            align-items: stretch;

            margin: 0;
            padding: 0;

            li {
                list-style: none;

                a {
                    display: block;
                    padding: 4px 16px 0;
                    height: 100%;
                    box-sizing: border-box;

                    display: flex;
                    align-items: center;

                    border-bottom: solid 4px transparent;

                    &:hover,
                    &.current {
                        text-decoration: none;

                        border-bottom-color: var(--foreground-color);
                    }
                }
            }
        }
    }
}

nav#index {
    flex: 1;

    margin: 32px 8px 16px;
    display: flex;
    flex-direction: column;

    section {
        position: relative;

        h1 {
            position: absolute;
            width: 0;
            font-size: 0;
            left: -16px;
            height: 100%;

            time {
                position: sticky;
                top: 72px;
                margin-left: -2ic;
                margin-bottom: 8px;

                display: inline-block;

                overflow: hidden;

                font-family: var(--font-calendar-nav);
                text-transform: uppercase;

                font-size: 1.5rem;
                line-height: 1;

                span {
                    display: block;
                    text-align: right;
                }

                .day {
                    font-size: 1.5em;
                }

                .month {
                    font-size: 1em;
                }

                .year,
                .month.four {
                    font-size: 0.75em;
                }
            }
        }

        article {
            h2 {
                margin: 0;
                font-size: 2rem;
            }

            ul.tags {
                margin: 0;
                padding: 0;

                display: flex;
                gap: 8px;

                font-size: 0.8rem;

                li {
                    list-style: none;

                    display: inline-block;
                    padding: 2px 8px;

                    background-color: var(--foreground-color);
                    color: var(--background-color);
                    border-radius: 4px;
                }
            }
        }
    }
}

main {
    flex: 1;

    display: flex;

    margin: 32px 8px 16px -248px;

    gap: 16px;
}

svg {
    path,
    rect,
    polygon {
        stroke: var(--foreground-color);

        &.filled {
            fill: var(--background-color);
        }
    }

    text {
        font-family: var(--font-content);
        fill: var(--foreground-color);
    }
}

footer {
    text-align: center;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: normal;
    margin-top: 0;
    padding: 0;
}

h1 {
    font-size: 2.25rem;
}

a {
    color: unset;

    text-decoration: none;

    &:hover {
        text-decoration: underline;
    }
}

figure {
    margin: 0;
    padding: 0;

    figcaption {
        text-align: center;
        position: relative;

        margin-top: 16px;

        &::before {
            content: "";
            display: block;
            width: 256px;
            border-top: solid 1px var(--foreground-color);

            position: absolute;
            inset: -8px 0 auto;
            margin: auto;
        }
    }
}

@media screen and (max-width: 1536px /* 1024 + 2*(240+16) */) {
    body::before {
        display: none;
    }

    main {
        margin: 32px 8px 16px;

        & > nav#toc {
            position: relative;

            &::after {
                content: "";

                position: absolute;
                inset: 0 -8px 0 auto;
                border-right: solid 1px var(--foreground-color);
            }
        }
    }
}

@media screen and (max-width: 1164px) {
    nav#index section {
        h1 {
            width: unset;
            font-size: 2rem;

            position: sticky;
            inset: 64px 0 auto;

            background-color: var(--glassy-background-color);
            backdrop-filter: blur(8px);

            padding: 8px 0 16px;

            &::after {
                content: "";

                position: absolute;

                inset: auto 0 8px;

                border: solid 1px var(--foreground-color);
            }

            time {
                margin-left: 0;
                position: static;
                display: inline;

                font-family: unset;
                font-size: unset;

                .day,
                .month,
                .year {
                    display: inline !important;
                    font-size: unset;
                }
            }
        }
    }
}

@media screen and (max-width: 1024px) {
    main {
        flex-direction: column;

        & > nav#toc {
            width: auto;

            &::after {
                display: none;
            }
        }
    }
}