:root {
    --bg: #f0ede6;
    --text: #171717;
    --hover: #070707;
    --muted: #676767;
    --faded: #979797;
    --primary: #00b0CD;
    --secondary: #80c0cc;
    --gray: #6f6f6f;
    --pink: #E463D2;
    --cyan: #00C4D8;
    --green: #00D771;
    --blue: #2096F6;
    --orange: #E78B05;
    /*--line: rgba(23, 23, 23, 0.12);*/
    --line: #272727;
    --light: #dfdfdf;
    --white: #f7f7f7;
    --surface: rgba(255, 255, 255, 0.28);
    --font-sans: Inter, -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-serif: "Source Serif", "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
    --column-width: min(72rem, calc(100% - 3rem));
    --content-width: min(48rem, calc(100% - 3rem));
}

* {
    box-sizing: border-box;
}

html {
    font-size: 14px;
    background: var(--bg);
}

a {
    color: inherit;
    font-weight: 500;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2rem;

    &:hover {
        color: var(--hover);
        text-decoration: underline;
        text-decoration-thickness: 1px;
        text-underline-offset: 0.2rem;
    }
}

.icon {
    align-items: center;
    display: inline-flex;
    flex: 0 0 auto;
    height: 1em;
    justify-content: center;
    line-height: 1;
    width: 1em;
}

.icon svg {
    display: block;
    height: 100%;
    width: 100%;
}

h1 {
    font-size: clamp(2.5rem, 10dvw, 4rem);
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1;
    margin: 0 0 1rem;
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    line-height: 1.3;
    margin: 0 0 1.5rem;
}

h3 {
    color: var(--muted);
    font-size: 1.4rem;
    font-weight: 700;
    line-height: 1.3;
}

body {
    margin: 0 auto;
    padding: 0;
    min-height: 100dvh;
    background: var(--bg);
    color: var(--text);
    display: grid;
    font-family: var(--font-sans);
    grid-template-rows: 5rem 1fr auto;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    width: 100dvw;

    /* site header and footer defaults */
    > header,
    > footer {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 1rem;
    }

    /* site header */
    > header {
        border-bottom: 1px solid var(--light);
        padding: 0 1.5rem;

        .title {
            align-items: center;
            display: flex;
            gap: 1rem;
            height: 100%;
            align-items: stretch;
        }

        .logo,
        .page {
            align-items: center;
            display: flex;
            font-size: 1.5rem;
            gap: 0.5rem;
            text-decoration: none;
        }

        .logo {
            font-weight: 700;
        }

        .page {
            font-weight: 700;
        }

        .logo:has(+ .page) {
            color: var(--faded);
        }

        .scheme {
            color: var(--faded);
        }

        .param {
            color: var(--text);
        }

        nav {
            align-items: center;
            display: none;
            gap: 1.5rem;
            font-size: 1rem;

            a {
                text-decoration: none;
            }
        }
    }

    /* site footer */
    > footer {
        color: var(--muted);
        display: flex;
        flex-direction: column;
        gap: 2rem;
        padding-top: 2rem;

        section {
            width: var(--column-width);
        }

        #footnotes ul {
            list-style: none;
            margin: 0;
            padding: 0;

            li {
                display: grid;
                grid-template-columns: 1.5rem auto;

                span.symbol {
                    font-size: 1.25rem;
                }
            }
        }
    }
}

/* case study wrapper */
main {
    display: grid;
    justify-items: center;

    /* layout handling for the top sections */
    header,
    aside {
        display: flex;
        width: var(--column-width);
    }

    /* top hero */
    header {
        padding: 0;

        /* temporary height clamping */
        &:has(+ aside) {
            display: grid;
            align-content: end;
            min-height: clamp(12rem, 50dvh, 18rem);
        }

        .lede {
            margin: 1rem 0 0;
            font-size: 1.6rem;
            line-height: 1.4;
        }
    }

    /* stats */
    aside {
        align-items: flex-start;
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
        justify-content: flex-start;
        margin-top: 3rem;

        figure {
            display: grid;
            grid-template-columns: 2.25rem auto;
            grid-template-rows: 1.5rem auto;
            margin: 0;
            --icon: var(--blue);

            span.icon {
                width: 1.5rem;
                height: 1.5rem;
                color: var(--icon);
            }

            label {
                color: var(--text);
                font-size: 1rem;
                text-transform: uppercase;
                font-weight: 600;
            }

            figcaption {
                color: var(--muted);
                font-size: 1.05rem;
                line-height: 1.4;
                grid-column-start: 2;
            }

            &:nth-child(2) {
                --icon: var(--orange);
            }
            &:nth-child(3) {
                --icon: var(--green);
            }
            &:nth-child(4) {
                --icon: var(--pink);
            }
            &:nth-child(5) {
                --icon: var(--cyan);
            }
        }
    }
}

/* case study content */
article {
    background: var(--white);
    display: grid;
    gap: 2rem;
    grid-template-columns: 1fr;
    justify-content: center;
    padding: 4rem 1.5rem 3rem;
    width: 100%;

    nav#toc {
        align-self: start;
        position: sticky;
        margin-left: -1.5rem;
        top: 0;
        width: calc(100% + 3rem);

        ol {
            border-top: 3px solid var(--light);
            display: grid;
            list-style: decimal-leading-zero;
            list-style-position: inside;
            margin: 0;
            padding: 0;

            li {
                background: var(--white);
                border-bottom: 1px solid var(--light);
                height: 2.5rem;
                padding: 0.4rem 0.25rem 0;

                &::marker {
                    color: var(--muted);
                }

                &:last-child {
                    border: none;
                }
            }
        }

        a {
            color: var(--muted);
            text-decoration: none;
            transition: padding 125ms ease;

            &.active {
                color: var(--text);
                font-weight: 700;
                padding-left: 0.25rem;
            }

            &:hover {
                color: var(--text);
            }
        }
    }

    #content {
        display: grid;
        gap: 1.5rem;
    }

    section {
        width: 100%;

        &#intro {
            p:first-of-type {
                font-size: 1.1rem;
            }
        }
    }

    figure {
        /*background: var(--bg);*/
        align-items: center;
        display: flex;
        flex-direction: column;
        gap: 2rem;
        justify-content: center;
        margin: 2rem 0;
        padding: 0;
        position: relative;

        img {
            max-width: 100%;

            &.desktop {
                aspect-ratio: 1.4 / 1;
            }
            &.mobile {
                aspect-ratio: 0.46 / 1;
                height: 20rem;
            }
        }

        figcaption {
            color: var(--muted);
            font-size: 0.875rem;
            line-height: 1.5;
        }
    }
}


/**
 * display queries */

.tablet-show,
.laptop-show,
.display-show {
    display: none;
}

/* tablets */
@media (min-width: 640px)
{
    html {
        font-size: 16px;
    }

    body > header {
        padding: 0 2rem;

        nav {
            display: flex;
        }
    }

    main {
        header {
            .lede {
                max-width: 60%;
            }
        }
        aside {
            flex-direction: row;
            gap: 2rem;

            figure {
                grid-template-columns: auto;
                grid-template-rows: 2rem 2rem auto;
                max-width: 20%;
                padding-right: 1rem;

                figcaption {
                    grid-column-start: 1;
                }
            }
        }
    }

    .tablet-show {
        display: block;
    }
    .tablet-hide {
        display: none;
    }
}

/* laptops */
@media (min-width: 1024px)
{
    article {
        gap: 3rem;
        grid-template-columns: 12rem var(--content-width);

        nav#toc {
            margin-left: 0;
            top: 4rem;
            width: 12rem;

            ol {
                margin-top: 0.75rem;
            }
        }
    }
}

/* desktops */
@media (min-width: 1280px)
{
    html {
        font-size: 17px;
    }

    article {
        gap: 0;
        grid-template-columns: 16rem var(--content-width) 8rem;
    }
}

/* displays */
@media (min-width: 1440px)
{
    html {
        font-size: 18px;
    }

    article {
        padding: 4rem 0 3rem;

        nav#toc {
            font-size: 0.925rem;

            ol li {
                padding-top: 0.5rem;
            }
        }

        figure {
            align-items: flex-end;
            flex-direction: row;

            figcaption {
                font-size: 0.75rem;
                position: absolute;
                right: -10rem;
                bottom: 1rem;
                width: 8rem;
            }
        }
    }
}


/**
 * deprecate? */
@media (max-width: 900px) {

    article #content {
        width: 100%;
    }

    article section {
        width: 100%;
    }
}