/* ==========================================================================
   Cupper — personal site
   Reading-first rebuild. Palette, Miriam Libre headings and the bookmark
   motif are inherited from Heydon Pickering's original Cupper theme.
   ========================================================================== */

/* --- Fonts -------------------------------------------------------------
   Miriam Libre (Michal Sahar) and Source Sans 3 (Adobe) are both under the
   SIL Open Font License 1.1. woff2 files taken from @fontsource 5.2.5.
   See static/css/fonts/OFL.txt.
   ------------------------------------------------------------------------ */

@font-face {
    font-family: 'Miriam Libre';
    src: url('fonts/miriamlibre-regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Miriam Libre';
    src: url('fonts/miriamlibre-bold.woff2') format('woff2'),
         url('fonts/miriamlibre-bold.woff') format('woff');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Source Sans 3';
    src: url('fonts/sourcesans3-regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Source Sans 3';
    src: url('fonts/sourcesans3-italic.woff2') format('woff2');
    font-weight: 400;
    font-style: italic;
    font-display: swap;
}
@font-face {
    font-family: 'Source Sans 3';
    src: url('fonts/sourcesans3-semibold.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Source Sans 3';
    src: url('fonts/sourcesans3-bold.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

/* --- Tokens ------------------------------------------------------------ */

:root {
    --bg: #fefefe;
    --ink: #111;
    --muted: #57534e;
    --faint: #f2f1ec;
    --accent: #f5c518;

    --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-display: 'Miriam Libre', Georgia, serif;
    --font-mono: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;

    /* Reading measure. Source Sans 3's digit glyph is wider than its average
       character, so 68ch renders as roughly 81 actual characters. */
    --measure: 68ch;
    --lh: 1.65;
    /* One blank line — the unit all vertical rhythm is built from. */
    --line: 1.65em;

    --sidebar-w: 15rem;
    --topbar-h: 3.5rem;
    --toc-w: 13rem;
    --gutter: 3rem;
}

/* --- Reset ------------------------------------------------------------- */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: inherit;
    background-color: inherit;
    color: inherit;
}
template, [hidden] { display: none !important; }

html {
    font-size: clamp(1.0625rem, 1rem + 0.25vw, 1.3rem);
    font-family: var(--font-body);
    line-height: var(--lh);
    color: var(--ink);
    background-color: var(--bg);
    -webkit-text-size-adjust: 100%;
}
body { font-kerning: normal; }

img { max-width: 100%; height: auto; }
svg { fill: currentColor; }

a {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px solid;
}
a:hover { background-color: var(--accent); }
abbr { text-decoration: none; cursor: help; border-bottom: 1px dashed; }

:focus-visible { outline: 3px solid var(--muted); outline-offset: 2px; }
[tabindex="-1"]:focus { outline: none; }

/* Visually hidden */
.vh {
    position: absolute !important;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    top: -3rem; left: 0;
    z-index: 10;
    display: block;
    width: 100%;
    padding: 0.75rem;
    text-align: center;
    color: var(--bg);
    background: var(--ink);
    border: 0;
}
.skip-link:focus { top: 0; }

/* --- Headings ---------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    line-height: 1.15;
    font-weight: 700;
    overflow-wrap: break-word;
}
h1 { font-size: 2.25rem; letter-spacing: -0.01em; }
h2 { font-size: 1.55rem; }
h3 { font-size: 1.2rem; font-weight: 400; }
h4 { font-size: 1rem; font-family: var(--font-body); font-weight: 700; }
h5 { font-size: 0.85rem; font-family: var(--font-body); text-transform: uppercase; letter-spacing: 0.06em; }

/* ==========================================================================
   PROSE — the reading rhythm
   Explicit spacing, not a universal owl selector, so that headings can bind
   to the section below them instead of floating between two sections.
   ========================================================================== */

.prose { max-width: var(--measure); }
.prose > * { margin-top: 0; }
/* An image on its own line leaves an empty <p> behind the <figure>. */
.prose > p:empty { display: none; }

/* One full blank line between paragraphs (was 0.75rem against a 1.5 line-height,
   which is what made the old posts read as a single slab). */
.prose > * + * { margin-top: var(--line); }

.prose > h2 { margin-top: 3.25rem; }
.prose > h3 { margin-top: 2.5rem; }
.prose > h4 { margin-top: 2rem; }
/* Asymmetric: a heading sits close to the text it introduces. */
.prose > h2 + *,
.prose > h3 + *,
.prose > h4 + * { margin-top: 0.6rem; }

.prose > h2 {
    padding-bottom: 0.3rem;
    border-bottom: 2px solid var(--ink);
}

.prose p { overflow-wrap: break-word; }

.prose strong { font-weight: 700; }

/* Links in running text get the accent underline; nav links elsewhere don't. */
.prose a {
    border-bottom: 1px solid var(--accent);
    box-shadow: inset 0 -0.35em 0 var(--accent);
    transition: box-shadow 0.12s ease-in-out;
}
.prose a:hover { box-shadow: inset 0 -1em 0 var(--accent); background: none; }

/* Components carry their own link treatment — opt them out of the
   running-text highlight so only prose links get the marker underline. */
.prose .post-list a,
.prose .post-tags a,
.prose .tag-list a,
.prose .post-nav a,
.prose .toc a,
.toc a {
    border-bottom: 0;
    box-shadow: none;
}

/* Lists.
   Scoped to unclassed lists so these rules don't leak into component lists
   (.post-list, .post-tags, .toc) that also live inside .prose. */
.prose ul:not([class]), .prose ol:not([class]) { padding-left: 1.4em; }
.prose ul:not([class]) > li + li,
.prose ol:not([class]) > li + li { margin-top: 0.4em; }
.prose li > ul:not([class]), .prose li > ol:not([class]) { margin-top: 0.4em; }
.prose ol ol { list-style: lower-latin; }
.prose ol ol ol { list-style: lower-roman; }
.prose dt { font-weight: 700; }
.prose dd { padding-left: 1.5rem; }

/* Blockquote — used for the "Github repo:" / "Cross-posted" notes */
.prose blockquote {
    padding: 0.75rem 1.1rem;
    border-left: 0.4rem solid var(--accent);
    background: var(--faint);
    font-size: 0.95rem;
}
.prose blockquote > * + * { margin-top: 0.5rem; }

.prose hr {
    border: 0;
    border-top: 2px solid var(--ink);
    margin-top: 3rem;
}

/* --- Figures ----------------------------------------------------------- */

.prose { counter-reset: fig; }

figure { text-align: center; }
figure img {
    display: block;
    width: auto;
    margin: 0 auto;
    /* Tall images would otherwise take over the whole screen once the
       column got wider. Cap the height and let width follow. */
    max-height: 80vh;
    border: 1px solid var(--faint);
}
figcaption {
    /* Captions stay at reading width even when the figure breaks out. */
    max-width: var(--measure);
    margin: 0.6rem auto 0;
    font-size: 0.85rem;
    line-height: 1.45;
    color: var(--muted);
    text-align: left;
}
figcaption::before {
    counter-increment: fig;
    content: 'Figure ' counter(fig) '. ';
    font-weight: 700;
    color: var(--ink);
}

/* Break out of the text column, centred on it. */
.prose > figure.wide {
    width: min(calc(100% + var(--gutter) * 2), 94vw);
    max-width: none;
    margin-left: 50%;
    transform: translateX(-50%);
}

/* --- Code -------------------------------------------------------------- */

code {
    font-family: var(--font-mono);
    font-size: 0.87em;
}
:not(pre) > code {
    padding: 0.1em 0.32em;
    background: var(--faint);
    border-radius: 0.2rem;
    overflow-wrap: break-word;
}
pre {
    overflow-x: auto;
    padding: 1.1rem 1.25rem;
    border: 1px solid var(--ink);
    line-height: 1.5;
    font-size: 0.95rem;
}
pre code { background: none; padding: 0; }

pre[class*="language-"] {
    background: none;
    margin-bottom: 0;
}
code[class*="language-"], pre[class*="language-"] {
    text-shadow: none;
    filter: grayscale(100%);
}

.cmd { padding: 0.75rem 1rem; background: var(--ink); }
.cmd code { color: var(--bg); white-space: nowrap; }
.cmd code::before { content: '$'; font-weight: 700; padding-right: 0.4em; }

.highlight {
    background: var(--accent);
    padding: 0.0625rem 0.33rem;
    border-radius: 0.5rem;
}

/* --- Tables ------------------------------------------------------------ */

.table-scroll { overflow-x: auto; }

table {
    text-align: left;
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    line-height: 1.4;
}
th, td {
    border: 1px solid var(--ink);
    padding: 0.45rem 0.6rem;
}
th { font-weight: 700; background: var(--faint); }
th:empty { border: 0; background: none; }
caption { font-size: 0.95rem; padding-bottom: 0.35rem; font-style: italic; }

/* The News table on the home page reads as a list, not a grid. */
.home table, .home th, .home td { border: 0; background: none; }
.home td:first-child, .home th:first-child {
    white-space: nowrap;
    padding-left: 0;
    padding-right: 1.1rem;
    font-variant-numeric: tabular-nums;
    color: var(--muted);
    vertical-align: top;
    width: 1%;
}
.home td { text-align: left !important; vertical-align: top; }
.home tbody tr + tr td { border-top: 1px solid var(--faint); }
.home thead { display: none; }

/* --- Notes and warnings ------------------------------------------------ */

.note {
    display: flex;
    padding: 1rem 1.1rem;
    border-left: 0.4rem solid var(--ink);
    background: var(--faint);
    font-size: 0.95rem;
}
.note .sign { flex: 0 0 auto; height: 1.6rem; width: 1.6rem; }
.note > div { margin-left: 0.75rem; }
.note > div > * + * { margin-top: 0.5rem; }
.note.warning { border-left-color: #c83737; }

/* ==========================================================================
   LAYOUT A — identity sidebar (Home, Publications, tags, 404)
   ========================================================================== */

.wrapper { position: relative; }

.intro-and-nav {
    position: fixed;
    top: 0; left: 0;
    width: var(--sidebar-w);
    height: 100vh;
    font-size: 0.8rem;
    border-right: 2px solid var(--ink);
    z-index: 5;
}
.intro-and-nav > div {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 2rem 1.5rem;
}
.intro { flex: 0 0 auto; text-align: center; }

.logo { border: 0; display: block; }
.logo:hover { background: none; }
.logo img { width: 100%; max-width: 11rem; margin: 0 auto; }

.library-desc {
    margin-top: 0.9rem;
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.2;
}
.library-desc-zh {
    margin-top: 0.3rem;
    font-family: 'Noto Sans TC', '微軟正黑體', 'PingFang TC', var(--font-display), serif;
    font-size: 1.05rem;
    font-weight: 700;
}
.email {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--muted);
    overflow-wrap: break-word;
}

.icons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    list-style: none;
    margin-top: 0.9rem;
    font-size: 1.15rem;
}
.icons a { border: 0; display: inline-block; line-height: 1; }
.icons a:hover { background: none; color: var(--muted); }

/* Nav */
.patterns { flex: 1 1 auto; overflow-y: auto; margin-top: 1.75rem; }
#patterns-list { list-style: none; }
.patterns li + li { margin-top: 0.4rem; }
.pattern a {
    display: flex;
    align-items: baseline;
    padding: 0.4em 1em;
    border: 0;
    font-weight: 700;
}
.pattern a:hover { background-color: var(--accent); }
.pattern .text { margin-left: 0.2rem; }
.pattern [aria-current] {
    background-color: var(--ink);
    color: var(--bg);
    clip-path: polygon(0% 0%, 90% 0%, 100% 50%, 90% 100%, 0% 100%);
    padding-right: 1.6em;
}
.pattern [aria-current]:hover { background-color: var(--ink); color: var(--bg); }

#menu-button {
    display: none;
    width: 100%;
    padding: 0.7rem;
    font-family: inherit;
    font-size: 1rem;
    color: var(--bg);
    background: var(--ink);
    border: 0;
    border-radius: 0.3rem;
    cursor: pointer;
}
#menu-button svg { width: 1em; height: 1em; margin-right: 0.3em; vertical-align: -0.1em; }

.main-and-footer { margin-left: var(--sidebar-w); }
.main-and-footer > div {
    max-width: 52rem;
    margin: 0 auto;
    padding: 2.5rem 2.25rem;
}
.main-and-footer main > h1 { margin-bottom: 1.75rem; }
.prose-sidebar { max-width: var(--measure); }

/* ==========================================================================
   LAYOUT B — reading view (blog index and posts)
   ========================================================================== */

.topbar {
    position: sticky;
    top: 0;
    z-index: 5;
    height: var(--topbar-h);
    border-bottom: 2px solid var(--ink);
    background: var(--bg);
}
.topbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    height: 100%;
    max-width: 72rem;
    margin: 0 auto;
    padding: 0 2rem;
}
.topbar-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    border: 0;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.95rem;
    white-space: nowrap;
}
.topbar-brand:hover { background: none; color: var(--muted); }
.topbar-avatar {
    width: 1.9rem; height: 1.9rem;
    border-radius: 50%;
    object-fit: cover;
}
.topbar-nav ul { display: flex; gap: 1.1rem; list-style: none; }
.topbar-nav a {
    border: 0;
    font-size: 0.9rem;
    padding-bottom: 0.15rem;
}
.topbar-nav a:hover { background: none; box-shadow: inset 0 -0.3em 0 var(--accent); }
.topbar-nav [aria-current] { box-shadow: inset 0 -0.3em 0 var(--accent); font-weight: 700; }

/* Masthead */
.masthead {
    border-bottom: 1px solid var(--faint);
    padding: 3.5rem 2rem 2.25rem;
}
/* Shares the article grid so the title lines up with the body text. */
.masthead-inner {
    display: grid;
    grid-template-columns: min(var(--measure), 100%) var(--toc-w);
    column-gap: var(--gutter);
    justify-content: center;
    max-width: 84rem;
    margin: 0 auto;
}
.masthead-inner > * { grid-column: 1; min-width: 0; }
.masthead h1 {
    font-size: clamp(1.8rem, 1.3rem + 1.2vw, 2.1rem);
    /* Display type wants a wider measure than body text, so the title may
       run across the contents gutter. */
    grid-column: 1 / 3;
    max-width: 30ch;
}
.masthead .subtitle {
    margin-top: 0.9rem;
    font-size: 1.1rem;
    color: var(--muted);
    max-width: 40rem;
}
.masthead .subtitle p + p { margin-top: 0.5rem; }

.byline {
    display: flex;
    flex-wrap: wrap;
    gap: 1.75rem;
    margin-top: 2rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--faint);
    font-size: 0.85rem;
}
.byline dt {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    font-weight: 400;
}
.byline dd { margin-top: 0.15rem; font-weight: 600; }

/* Article body: prose centred in the viewport, contents in the right gutter. */
.article-body {
    display: grid;
    grid-template-columns: min(var(--measure), 100%) var(--toc-w);
    column-gap: var(--gutter);
    justify-content: center;
    align-items: start;
    max-width: 84rem;
    margin: 0 auto;
    padding: 3rem 2rem 0;
}
/* Both pinned to row 1. The rail precedes the prose in the DOM (so it comes
   first for screen readers and in the folded layout), and grid auto-placement
   never backtracks — without an explicit row the prose would be pushed into a
   second row, leaving a gap the height of the rail. */
.article-body > .prose { grid-column: 1; grid-row: 1; min-width: 0; }
.article-body > .toc { grid-column: 2; grid-row: 1; }

/* Contents rail */
.toc {
    position: sticky;
    top: calc(var(--topbar-h) + 1.5rem);
    justify-self: start;
    max-width: 15rem;
    font-size: 0.8rem;
    line-height: 1.4;
    border-left: 2px solid var(--ink);
    padding-left: 0.9rem;
}
.toc h2 {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    font-family: var(--font-body);
    font-weight: 700;
}
.toc ul { list-style: none; margin-top: 0.6rem; }
.toc li + li { margin-top: 0.45rem; }
.toc ul ul { margin-top: 0.45rem; padding-left: 0.8rem; }
.toc a { border: 0; color: var(--muted); }
.toc a:hover { background: none; color: var(--ink); box-shadow: inset 0 -0.3em 0 var(--accent); }

/* Section anchor links */
.h2-container { position: relative; }
.h2-container > a {
    position: absolute;
    top: 0.1em; left: -1.15em;
    border: 0;
    opacity: 0;
    color: var(--muted);
}
.h2-container:hover > a, .h2-container > a:focus { opacity: 1; }
.h2-container > a:hover { background: none; }

/* Prev / next */
.post-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    margin-top: 3.5rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--ink);
    font-family: var(--font-display);
    font-weight: 700;
}
.post-nav a {
    display: block;
    max-width: 20rem;
    border: 0;
    font-size: 0.95rem;
    line-height: 1.25;
}
.post-nav a:hover { background: none; box-shadow: inset 0 -0.4em 0 var(--accent); }
.post-nav .next { text-align: right; margin-left: auto; }
.post-nav span {
    display: block;
    font-family: var(--font-body);
    font-size: 0.68rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 0.25rem;
}

/* --- Post list --------------------------------------------------------- */

.post-list { list-style: none; padding-left: 0; }
.post-list > li + li {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--faint);
}
.post-list time {
    display: block;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
}
.post-list h2 {
    margin-top: 0.3rem;
    font-size: 1.4rem;
    line-height: 1.2;
}
.post-list h2 a { border: 0; }
.post-list h2 a:hover { background: none; box-shadow: inset 0 -0.35em 0 var(--accent); }
.post-summary { margin-top: 0.5rem; color: var(--muted); }
.post-tags {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
    padding-left: 0;
    list-style: none;
    margin-top: 0.75rem;
    font-size: 0.75rem;
}
.post-tags > li { margin: 0; }
.post-tags a {
    display: inline-block;
    padding: 0.1rem 0.5rem;
    border: 1px solid var(--faint);
    border-radius: 1rem;
    color: var(--muted);
}
.post-tags a:hover { background: var(--accent); color: var(--ink); border-color: var(--accent); }

/* --- Tags on a post ---------------------------------------------------- */

.tags {
    margin-top: 3rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--faint);
    font-size: 0.8rem;
    color: var(--muted);
}
.tags ul { display: inline; list-style: none; padding-left: 0; }
.tags li { display: inline; white-space: nowrap; margin: 0 0.5rem 0 0; }
.tags a { border: 0; box-shadow: none; }
.tags a:hover { background: var(--accent); color: var(--ink); }
.tags svg, .tag-icon { width: 0.75em; height: 0.75em; vertical-align: middle; }

/* --- Icons ------------------------------------------------------------- */

a > svg, button > svg, h1 > svg, li > svg {
    height: 0.75em;
    width: 0.75em;
    margin-right: 0.25em;
}
h1 > svg { width: 0.8em; height: 0.8em; }
.bookmark-icon { vertical-align: middle; }
.link-icon { width: 0.7em; height: 0.7em; }

/* --- Expandable sections ----------------------------------------------- */

.expandable-section { border-top: 1px solid var(--faint); padding-top: 0.9rem; }
[data-expands] {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    text-align: left;
    border: 0;
    background: none;
    color: inherit;
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
}
[data-expands] svg { width: 1em; height: 1em; }
[data-expands][aria-expanded="true"] svg .up-strut { display: none; }

/* --- Footer and theme toggle ------------------------------------------- */

[role="contentinfo"] {
    max-width: 72rem;
    margin: 5rem auto 0;
    padding: 1.5rem 2rem 2.5rem;
    border-top: 1px solid var(--faint);
    font-size: 0.8rem;
    color: var(--muted);
    text-align: center;
}
[role="contentinfo"] > div { margin-bottom: 0.6rem; }
label { display: inline-block; font-weight: 700; }
[for="themer"] {
    background: var(--ink);
    color: var(--bg);
    border-radius: 0.33em;
    padding: 0.25em 0.75em;
    cursor: pointer;
    font-size: 0.75rem;
}
[for="themer"] [aria-hidden]::before { content: 'off'; }
[for="themer"] :checked + [aria-hidden]::before { content: 'on'; }

/* --- 404 --------------------------------------------------------------- */

.custom-404 { text-align: center; padding-top: 3rem; }
.custom-404 h1 { margin-top: 1rem; }
.custom-404 p { margin-top: 0.75rem; }

/* ==========================================================================
   Responsive
   ========================================================================== */

/* Fold the contents rail under the masthead before it starts crowding. */
@media screen and (max-width: 78em) {
    .article-body {
        display: block;
        max-width: min(var(--measure), 100%);
        padding-top: 2.5rem;
    }
    .masthead-inner {
        display: block;
        max-width: min(var(--measure), 100%);
    }
    .masthead h1 { max-width: 100%; }
    .article-body > .prose { max-width: 100%; }
    .toc {
        position: static;
        max-width: none;
        margin-bottom: 2.5rem;
        padding: 1rem 1.1rem;
        border: 1px solid var(--ink);
        border-left-width: 0.4rem;
    }
    .prose > figure.wide { width: 100%; margin-left: 0; transform: none; }
}

@media screen and (max-width: 45em) {
    :root { --measure: 100%; }

    .intro-and-nav {
        position: static;
        width: auto;
        height: auto;
        border-right: 0;
        border-bottom: 2px solid var(--ink);
    }
    .intro-and-nav > div { padding: 1.5rem; }
    .main-and-footer { margin-left: 0; }
    .main-and-footer > div { padding: 1.75rem 1.25rem; }

    #menu-button { display: block; }
    #patterns-list { display: none; margin-top: 0.6rem; border: 1px solid var(--ink); }
    [aria-expanded="true"] + #patterns-list { display: block; }
    .patterns li + li { margin-top: 0; border-top: 1px solid var(--ink); }
    .pattern a { padding: 0.85rem 1rem; }
    .pattern [aria-current] { clip-path: none; padding-right: 1rem; }

    .topbar-inner { padding: 0 1.25rem; gap: 0.75rem; }
    .topbar-brand span { display: none; }
    .topbar-nav ul { gap: 0.85rem; }

    .masthead { padding: 2.25rem 1.25rem 1.75rem; }
    .byline { gap: 1.1rem; margin-top: 1.5rem; }
    .article-body { padding: 2rem 1.25rem 0; }
    [role="contentinfo"] { padding: 1.5rem 1.25rem 2rem; }

    .prose > h2 { margin-top: 2.5rem; }
    code { word-break: break-word; }
}

/* ==========================================================================
   Print
   ========================================================================== */

@media print {
    .intro-and-nav, .topbar, [role="contentinfo"], .toc, .post-nav, .skip-link { display: none; }
    .main-and-footer { margin-left: 0; }
    .article-body { display: block; padding: 0; }
    :root { --measure: 100%; }
    a { border: 0; box-shadow: none !important; }
    .prose a::after { content: " (" attr(href) ")"; word-break: break-word; font-size: 0.85em; }
    pre code { white-space: pre-wrap !important; }
    figure, table, pre { page-break-inside: avoid; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Active section in the contents rail (set by dom-scripts.js) */
.toc a[aria-current] {
    color: var(--ink);
    font-weight: 600;
    box-shadow: inset 0 -0.3em 0 var(--accent);
}