/* Same system as usmankhan.io: Inter, white, zinc greys, one blue accent. */

:root {
    --text: #111111;
    --body: #3f3f46;
    --muted: #71717a;
    --border: #e4e4e7;
    --border-soft: #efeff1;
    --surface: #f4f4f5;
    --accent: #2563eb;
    --done: #16a34a;

    --gutter: 3rem;
    --side-top: 6rem;
    --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-size-adjust: 100%;
}

/* No rubber-band bounce when scrolling past the top or bottom. */
html,
body {
    overscroll-behavior: none;
}

body {
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.65;
    color: var(--body);
    background-color: #ffffff;
}

a {
    color: inherit;
    text-decoration: none;
}

ul,
ol {
    list-style: none;
}

img,
svg {
    display: block;
}

strong {
    font-weight: 600;
    color: var(--text);
}

::selection {
    background-color: rgb(37 99 235 / 0.15);
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}

/* Shared */

h1,
h2,
h3 {
    color: var(--text);
    font-weight: 600;
}

h2 {
    font-size: 1.5rem;
    letter-spacing: -0.02em;
}

.meta {
    font-size: 0.875rem;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.link {
    color: var(--text);
    text-decoration: underline;
    text-decoration-color: #d4d4d8;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

.link:hover {
    color: var(--accent);
    text-decoration-color: var(--accent);
}

/* Status of an experiment: a small dot and a word. Kept inline (not flex) so its baseline is the
   text's baseline in every browser, and it lines up with whatever sits beside it. */
.status {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text);
    white-space: nowrap;
}

.status::before {
    content: "";
    display: inline-block;
    width: 0.4375rem;
    height: 0.4375rem;
    margin-right: 0.4375rem;
    border-radius: 50%;
    background-color: #a1a1aa;
    vertical-align: 0.1em; /* centres the dot on the capitals */
}

.status-progress::before {
    background-color: var(--accent);
}

.status-done::before {
    background-color: var(--done);
}

.status-dropped {
    color: var(--muted);
}

/* Layout: intro stays put on the left, everything else scrolls on the right. */

.shell {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 5rem;
    max-width: 80rem;
    margin: 0 auto;
    padding: 0 var(--gutter);
}

/* Sidebar */

.side {
    position: sticky;
    top: 0;
    align-self: start;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100vh;
    padding: var(--side-top) 0 4rem;
}

.kicker {
    margin-bottom: 0.625rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
}

.kicker a {
    transition: color 0.15s ease;
}

.kicker a:hover {
    color: var(--text);
}

h1 {
    font-size: 3rem;
    line-height: 1.05;
    letter-spacing: -0.035em;
    margin-bottom: 1.25rem;
}

/* Experiment titles are longer than "Lab", so they get a smaller size. */
h1.title {
    font-size: 2.125rem;
    line-height: 1.15;
    letter-spacing: -0.03em;
    text-wrap: balance;
}

.lead {
    max-width: 22rem;
    font-size: 1.125rem;
    line-height: 1.6;
}

.side-nav {
    display: flex;
    flex-direction: column;
    margin-top: 3.5rem;
}

.side-nav a {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.625rem 0;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
    transition: color 0.2s ease;
}

/* The line in front of each item grows when it is hovered or current. */
.side-nav a::before {
    content: "";
    width: 2rem;
    height: 1px;
    background-color: #d4d4d8;
    transition: width 0.2s ease, background-color 0.2s ease;
}

.side-nav a:hover,
.side-nav a.active {
    color: var(--text);
}

.side-nav a:hover::before,
.side-nav a.active::before {
    width: 4rem;
    background-color: var(--text);
}

.side-bottom {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.back {
    width: fit-content;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text);
    transition: color 0.15s ease;
}

.back:hover {
    color: var(--accent);
}

.socials {
    display: flex;
    gap: 0.625rem;
}

.socials a {
    display: grid;
    place-items: center;
    width: 2.5rem;
    height: 2.5rem;
    border: 1px solid var(--border);
    border-radius: 0.625rem;
    color: #52525b;
    transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.socials a:hover {
    color: var(--text);
    border-color: #d4d4d8;
    background-color: #fafafa;
}

.socials svg {
    width: 1.125rem;
    height: 1.125rem;
}

/* Main column */

/* Starts level with the sidebar's title, less 0.2rem so the cap tops of the h2 and the h1
   line up, not just their boxes. */
.main-col {
    padding-top: calc(var(--side-top) - 0.2rem);
    padding-bottom: 4rem;
}

/* Sections */

/* Each section starts with a thin line across the column, heading just below it. */
.section {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    scroll-margin-top: 6rem;
}

/* The first thing in the column sits flush with the sidebar's top, at every breakpoint. */
.section.section-first {
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.head-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text);
    white-space: nowrap;
    transition: color 0.15s ease;
}

.head-link:hover {
    color: var(--accent);
}

.section-intro {
    margin: -0.5rem 0 1.75rem;
}

/* Facts card: date, status and code link at the top of an experiment page. */

/* The card's top edge lines up with the cap tops of the sidebar's "Lab" kicker. */
#facts {
    margin-top: 0.55rem;
    scroll-margin-top: 6rem;
}

.facts {
    padding: 1.5rem 1.75rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 1rem;
}

.facts-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
    padding-bottom: 0.875rem;
    border-bottom: 1px solid var(--border);
}

.facts-head h2 {
    font-size: 1rem;
    letter-spacing: -0.01em;
}

.facts-row {
    padding: 0.875rem 0;
}

.facts-row + .facts-row {
    border-top: 1px solid var(--border-soft);
}

.facts dt {
    font-size: 0.8125rem;
    color: var(--muted);
}

.facts dd {
    color: var(--text);
    line-height: 1.5;
    overflow-wrap: anywhere;
}

/* Experiment list: title and a note on the left, status and date on the right. */

.rows {
    border-top: 1px solid var(--border);
}

.rows li {
    border-bottom: 1px solid var(--border);
}

/* The next section's line closes the list; a second line here would double it. */
.rows li:last-child {
    border-bottom: 0;
}

/* And that section sits right under the list, so the last row is boxed in evenly. */
#experiments + .section {
    margin-top: 0;
}

.row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1.5rem;
    padding: 1rem 0;
}

.row-title {
    display: block;
    font-weight: 500;
    color: var(--text);
    transition: color 0.15s ease;
}

.row-sub {
    display: block;
    margin-top: 0.125rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--muted);
}

.row-meta {
    display: flex;
    align-items: baseline;
    gap: 0.875rem;
    flex-shrink: 0;
}

a.row:hover .row-title {
    color: var(--accent);
}

/* Status legend on the home page */

.legend {
    display: grid;
    gap: 0.625rem;
    margin-top: 1.5rem;
}

.legend div {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    font-size: 0.9375rem;
}

.legend dt {
    flex: 0 0 6.5rem;
}

/* Write-up text */

.prose {
    max-width: 40rem;
}

.prose > * + * {
    margin-top: 1rem;
}

.prose h3 {
    margin-top: 2rem;
    font-size: 1.0625rem;
    letter-spacing: -0.01em;
}

.prose ul li,
.prose ol li {
    position: relative;
    padding-left: 1.375rem;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.prose li + li {
    margin-top: 0.625rem;
}

.prose ul li::before {
    content: "";
    position: absolute;
    left: 0.125rem;
    top: 0.68em;
    width: 0.3125rem;
    height: 0.3125rem;
    border-radius: 50%;
    background-color: #a1a1aa;
}

.prose ol {
    counter-reset: step;
}

.prose ol li::before {
    content: counter(step) ".";
    counter-increment: step;
    position: absolute;
    left: 0;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.prose a {
    color: var(--text);
    text-decoration: underline;
    text-decoration-color: #d4d4d8;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

.prose a:hover {
    color: var(--accent);
    text-decoration-color: var(--accent);
}

.prose code {
    padding: 0.125em 0.375em;
    font-family: var(--mono);
    font-size: 0.85em;
    color: var(--text);
    background-color: var(--surface);
    border-radius: 0.375rem;
}

.prose pre {
    padding: 1rem 1.25rem;
    overflow-x: auto;
    font-size: 0.8125rem;
    line-height: 1.6;
    background-color: var(--surface);
    border-radius: 0.75rem;
}

.prose pre code {
    padding: 0;
    font-size: inherit;
    background: none;
}

.prose blockquote {
    padding-left: 1.25rem;
    border-left: 2px solid var(--border);
    color: var(--muted);
}

.prose table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
    font-variant-numeric: tabular-nums;
}

.prose th,
.prose td {
    padding: 0.625rem 1rem 0.625rem 0;
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--border-soft);
}

.prose th {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--muted);
    border-bottom-color: var(--border);
}

.prose img {
    width: 100%;
    height: auto;
    border-radius: 0.5rem;
    box-shadow: 0 0 0 1px rgb(0 0 0 / 0.06), 0 8px 24px -10px rgb(0 0 0 / 0.16);
}

.prose .caption {
    margin-top: 0.625rem;
    font-size: 0.8125rem;
    color: var(--muted);
}

/* A short note at the end of a section, e.g. "no results yet". */
.note {
    color: var(--muted);
}

/* Results: a row of headline numbers */

.stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.875rem;
    margin-top: 1.5rem;
}

.stat {
    padding: 1.125rem 1.25rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 0.875rem;
}

.stat-label {
    font-size: 0.8125rem;
    line-height: 1.4;
    color: var(--muted);
}

.stat-value {
    margin-top: 0.375rem;
    font-size: 1.75rem;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.025em;
    color: var(--text);
}

.stat-sub {
    margin-top: 0.5rem;
    font-size: 0.8125rem;
    line-height: 1.45;
    color: var(--muted);
}

.stats.stats-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

/* Figures: inline SVG charts, drawn at the column's width */

.figure {
    margin: 1.75rem 0 0;
}

.figure svg {
    display: block;
    width: 100%;
    height: auto;
    font-family: var(--font);
}

.figure .caption {
    margin-top: 0.625rem;
    max-width: 40rem;
    font-size: 0.8125rem;
    line-height: 1.5;
    color: var(--muted);
}

/* Prose that follows a figure or the stats row starts with normal spacing. */
.figure + .prose,
.stats + .prose {
    margin-top: 1.75rem;
}

.prose table td,
.prose table th {
    padding-right: 0.75rem;
}

/* Dropdowns for supporting detail */

.more {
    margin-top: 1.5rem;
    max-width: 40rem;
    border: 1px solid var(--border);
    border-radius: 0.875rem;
}

.more + .more {
    margin-top: 0.75rem;
}

.more summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    list-style: none;
}

.more summary::-webkit-details-marker {
    display: none;
}

.more summary::after {
    content: "+";
    font-size: 1.125rem;
    line-height: 1;
    color: var(--muted);
}

.more[open] summary::after {
    content: "\2212";
}

.more summary:hover {
    color: var(--accent);
}

.more-body {
    padding: 0 1.25rem 1.25rem;
}

.more .figure {
    margin-top: 1rem;
}

.more + .prose,
.figure + .more {
    margin-top: 1.75rem;
}

/* Short windows: tighten the sidebar so everything stays in view */

@media (max-height: 820px) {
    :root {
        --side-top: 3.5rem;
    }

    .side {
        padding-bottom: 3rem;
    }

    .side-nav {
        margin-top: 2.5rem;
    }
}

/* Medium screens: one column, intro on top */

@media (max-width: 960px) {
    :root {
        --gutter: 2rem;
    }

    .shell {
        display: block;
    }

    .side {
        position: static;
        height: auto;
        padding: 3rem 0 0;
    }

    .side-nav {
        display: none;
    }

    .side-bottom {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        margin-top: 2rem;
    }

    .main-col {
        padding-top: 3.5rem;
    }
}

/* Small screens */

@media (max-width: 640px) {
    :root {
        --gutter: 1.25rem;
    }

    h1 {
        font-size: 2.375rem;
    }

    h1.title {
        font-size: 1.75rem;
    }

    .facts {
        padding: 1.25rem 1.25rem 0.375rem;
    }

    .section {
        margin-top: 2.5rem;
        padding-top: 1.25rem;
    }

    .row {
        flex-direction: column;
        gap: 0.5rem;
    }

    .legend dt {
        flex-basis: 5.5rem;
    }

    .stats,
    .stats.stats-2 {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition: none !important;
    }
}