/* typography.css — Spectral body text, Fira Sans headings, OT features, and editorial flourishes */

/* ============================================================
   BODY TEXT
   ============================================================ */

#markdownBody {
    font-family: var(--font-serif);
    font-size: 1rem;
    line-height: var(--line-height);

    /* OT features: ligatures, old-style figures, kerning */
    font-feature-settings: 'liga' 1, 'onum' 1, 'kern' 1;
    font-variant-ligatures: common-ligatures;
    font-variant-numeric: oldstyle-nums;

    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;

    hyphens: auto;
    hanging-punctuation: first last;
}


/* ============================================================
   LITERARY FLOURISHES
   ============================================================ */

/* 1. Automated Dropcap for the opening paragraph */
#markdownBody > p:first-of-type::first-letter {
    float: left;
    font-size: 3.8em;
    line-height: 0.8;
    padding-top: 0.05em;
    padding-right: 0.1em;
    color: var(--text);
    font-variant-caps: normal; /* Prevent smcp collision */
}

/* 2. Magazine-style Lead-in (Small caps for the rest of the first line) */
#markdownBody > p:first-of-type::first-line {
    font-variant-caps: small-caps;
    letter-spacing: 0.05em;
    color: var(--text);
}

/* 3. Explicit dropcap — wrap any paragraph in a ::: dropcap ::: fenced div */
#markdownBody .dropcap p::first-letter {
    float: left;
    font-size: 3.8em;
    line-height: 0.8;
    padding-top: 0.05em;
    padding-right: 0.1em;
    color: var(--text);
    font-variant-caps: normal;
}

#markdownBody .dropcap p::first-line {
    font-variant-caps: small-caps;
    letter-spacing: 0.05em;
    color: var(--text);
}

/* 3. Epigraphs: Whispered preludes */
.epigraph {
    font-style: italic;
    font-size: 0.95em;
    margin: 0 0 3.3rem 0; /* 2x baseline grid */
    padding-left: 1.5em;
    border-left: 1px solid var(--border-muted);
    color: var(--text-muted);
}

/* 4. Pull Quotes */
.pull-quote {
    font-size: 1.25em;
    font-style: italic;
    text-align: center;
    margin: 3.3rem 0; /* 2x baseline grid */
    padding: 1.65rem 2rem; /* 1x baseline grid padding */
    border-top: 1px solid var(--border-muted);
    border-bottom: 1px solid var(--border-muted);
    color: var(--text);
}

/* 5. The Typographic Asterism (Replaces standard <hr>) */
#markdownBody hr {
    border: none;
    text-align: center;
    margin: 3.3rem 0; /* 2x baseline grid */
    color: var(--text-muted);
}
#markdownBody hr::after {
    content: "⁂";
    font-size: 1.5em;
    letter-spacing: 0.5em;
    padding-left: 0.5em; /* Optically center the letter-spacing */
    font-family: var(--font-serif);
}


/* ============================================================
   PARAGRAPHS & SPACING
   Anchored strictly to the 1.65rem baseline grid.
   ============================================================ */

#markdownBody p {
    margin: 0;
}

#markdownBody p + p,
#markdownBody .dropcap + p {
    text-indent: 1.5em;
}

/* Reset indent after any block-level element */
#markdownBody :is(blockquote, pre, ul, ol, figure, table, h1, h2, h3, h4, h5, h6, hr) + p {
    text-indent: 0;
}

/* Space between block-level elements: Exactly 1 line-height */
#markdownBody :is(blockquote, pre, ul, ol, figure, table) {
    margin: 1.65rem 0;
}


/* ============================================================
   HEADINGS
   Fira Sans Semibold. Margins tied to the 1.65rem rhythm.
   ============================================================ */

#markdownBody :is(h1, h2, h3, h4, h5, h6) {
    font-family: var(--font-sans);
    font-weight: 600;
    line-height: 1.25;
    color: var(--text);

    /* Disable Spectral OT features for Sans */
    font-feature-settings: normal;
    font-variant-numeric: normal;
    font-variant-ligatures: normal;
    text-rendering: optimizeLegibility;
}

/* Top margin: 3.3rem (2 lines). Bottom margin: 0.825rem (half line). */
#markdownBody h1 { font-size: 2.6rem;  margin: 0 0 1.65rem 0; }
#markdownBody h2 { font-size: 1.85rem; margin: 3.3rem 0 0.825rem 0; }
#markdownBody h3 { font-size: 1.45rem; margin: 2.475rem 0 0.825rem 0; }
#markdownBody h4 { font-size: 1.15rem; margin: 1.65rem 0 0.825rem 0; }
#markdownBody h5 { font-size: 1rem;    margin: 1.65rem 0 0.825rem 0; }
#markdownBody h6 { font-size: 1rem;    margin: 1.65rem 0 0.825rem 0; font-weight: 400; font-style: italic; }

/* Section heading self-links (¶ pilcrow) */
#markdownBody .heading { position: relative; }
#markdownBody .heading a::after {
    content: "\00B6";
    font-size: 0.75em;
    position: absolute;
    bottom: 0.15em;
    right: -1.25em;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.1s ease;
}
#markdownBody .heading:hover a::after {
    visibility: visible;
    opacity: 0.4;
}


/* ============================================================
   LINKS
   Thick, descender-clearing strokes.
   ============================================================ */

a {
    color: var(--link);
    text-decoration: underline;
    text-decoration-color: var(--border-muted);
    text-decoration-thickness: 0.15em;
    text-underline-offset: 0.15em;
    text-decoration-skip-ink: auto; /* Clears descenders */
    transition: text-decoration-color var(--transition-fast), color var(--transition-fast);
}

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

a:visited {
    color: var(--link-visited);
}


/* (external link icons moved to bottom of file — see data-link-icon section) */


/* ============================================================
   INLINE ELEMENTS & HIGHLIGHTING
   ============================================================ */

strong { font-weight: 700; }
strong.semibold { font-weight: 600; }
em { font-style: italic; }

/* Abbreviations: force uppercase acronyms to x-height */
abbr {
    font-variant-caps: all-small-caps;
    letter-spacing: 0.03em;
    text-decoration: none;
    cursor: help;
}

/* True superscripts & subscripts */
sup { font-variant-position: super; line-height: 1; }
sub { font-variant-position: sub; line-height: 1; }

/* Realistic Ink Highlighting — excludes user annotation marks */
#markdownBody mark:not(.user-annotation) {
    background-color: transparent;
    background-image: linear-gradient(
        104deg,
        rgba(250, 235, 120, 0) 0%,
        rgba(250, 235, 120, 0.8) 2%,
        rgba(250, 220, 100, 0.9) 98%,
        rgba(250, 220, 100, 0) 100%
    );
    background-size: 100% 0.7em;
    background-position: 0 88%;
    background-repeat: no-repeat;
    padding: 0 0.2em;
    color: inherit;
}
[data-theme="dark"] #markdownBody mark:not(.user-annotation) {
    background-image: linear-gradient(
        104deg,
        rgba(100, 130, 180, 0) 0%,
        rgba(100, 130, 180, 0.4) 2%,
        rgba(80, 110, 160, 0.5) 98%,
        rgba(80, 110, 160, 0) 100%
    );
}
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) #markdownBody mark:not(.user-annotation) {
        background-image: linear-gradient(
            104deg,
            rgba(100, 130, 180, 0) 0%,
            rgba(100, 130, 180, 0.4) 2%,
            rgba(80, 110, 160, 0.5) 98%,
            rgba(80, 110, 160, 0) 100%
        );
    }
}


/* ============================================================
   CODE
   ============================================================ */

code, kbd, samp {
    font-family: var(--font-mono);
    font-size: 0.88em;
    font-feature-settings: 'liga' 1, 'calt' 1;
    background-color: var(--bg-offset);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 0.1em 0.3em;
}

pre {
    position: relative;
    font-family: var(--font-mono);
    font-size: 0.88em;
    font-feature-settings: 'liga' 1, 'calt' 1;
    background-color: var(--bg-offset);
    border: 1px solid var(--border-muted);
    border-radius: 4px;
    padding: 1.65rem 1.5rem; /* Anchored to baseline grid */
    overflow-x: auto;
    line-height: 1.65;
}

pre code {
    font-size: 1em;
    background: none;
    border: none;
    padding: 0;
    border-radius: 0;
}


/* ============================================================
   BLOCKQUOTES
   Woven/stitched edge instead of a solid line.
   ============================================================ */

#markdownBody blockquote {
    margin-left: 0;
    margin-right: 0;
    padding-left: 1.5em;
    border-left: none; 
    
    /* Woven/stitched border using background gradients */
    background-image: linear-gradient(to bottom, var(--border-muted) 50%, transparent 50%);
    background-position: left top;
    background-repeat: repeat-y;
    background-size: 2px 8px; /* 2px wide, 8px repeating pattern */
    
    color: var(--text-muted);
    font-style: italic;
}

#markdownBody blockquote em {
    font-style: normal;
}

/* ── Poem excerpt ──────────────────────────────────────────────────────────── */
/* Usage: <figure class="poem-excerpt"><blockquote>…</blockquote>
          <figcaption><a href="…">Title</a> — Author</figcaption></figure>
   The blockquote inherits the default #markdownBody blockquote styles entirely
   (dashed left line, muted italic). The figure cancels the image-figure box
   styling (bg / border / padding / shadow) and uses the inherited centering
   (max-width: fit-content + margin: auto from #markdownBody figure).
   When a source link is present, a stretched ::after covers the whole figure
   so the entire excerpt is clickable.                                           */

#markdownBody figure.poem-excerpt {
    background: none;
    border: none;
    padding: 0;
    box-shadow: none;
    position: relative;
}

/* blockquote — no overrides; inherits default dashed-left-line treatment */

/* Figcaption: overrides the right-aligned italic image-caption default.
   Raised above the stretched-link overlay via z-index: 2.                      */
#markdownBody figure.poem-excerpt figcaption {
    text-align: left;
    padding-left: 1.5em; /* aligns with blockquote text */
    font-family: var(--font-ui);
    font-size: 0.73rem;
    font-style: normal;
    font-variant-caps: all-small-caps;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-top: 0.5rem;
    position: relative;
    z-index: 2;
}

#markdownBody figure.poem-excerpt figcaption a {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

/* Stretched link: clicking anywhere on the figure navigates to the poem page. */
#markdownBody figure.poem-excerpt figcaption a::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
    cursor: pointer;
}

#markdownBody figure.poem-excerpt figcaption a:hover {
    color: var(--text);
    border-color: var(--text-muted);
}

/* ── Prose excerpt (inline pull-quote from an article or book) ─────────────── */
/* Usage: <figure class="prose-excerpt"><blockquote>…</blockquote>
          <figcaption><a href="…">Source</a> — Author</figcaption></figure>
   Left-aligned (overrides figure centering). Same stretched-link pattern.      */

#markdownBody figure.prose-excerpt {
    background: none;
    border: none;
    padding: 0;
    box-shadow: none;
    width: auto;
    max-width: 100%;
    margin: 2.5rem 0;
    position: relative;
}

/* blockquote — no overrides; inherits default dashed-left-line treatment */

#markdownBody figure.prose-excerpt figcaption {
    text-align: left;
    padding-left: 1.5em;
    font-family: var(--font-ui);
    font-size: 0.73rem;
    font-style: normal;
    font-variant-caps: all-small-caps;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-top: 0.5rem;
    position: relative;
    z-index: 2;
}

#markdownBody figure.prose-excerpt figcaption a {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

#markdownBody figure.prose-excerpt figcaption a::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
    cursor: pointer;
}

#markdownBody figure.prose-excerpt figcaption a:hover {
    color: var(--text);
    border-color: var(--text-muted);
}


/* ============================================================
   LISTS
   ============================================================ */

#markdownBody ul,
#markdownBody ol {
    padding-left: 1.75em;
}

#markdownBody li + li {
    margin-top: 0.4125rem; /* Quarter line-height */
}

#markdownBody li > p {
    margin: 0;
    text-indent: 0;
}


/* ============================================================
   FIGURES & CAPTIONS
   Archival Photo Plates format.
   ============================================================ */

#markdownBody figure {
    margin: 3.3rem auto;
    background: var(--bg-offset);
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 2px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03); /* Extremely subtle depth */
    max-width: fit-content;
}

#markdownBody figure img {
    display: block;
    border: 1px solid var(--border-muted); /* Inner bounding box for the image */
}

#markdownBody figcaption {
    font-family: var(--font-sans);
    font-size: var(--text-size-small);
    color: var(--text-muted);
    text-align: right; /* Editorial, museum-placard feel */
    margin-top: 1rem;
    font-style: italic;
    letter-spacing: 0.02em;
}


/* ============================================================
   TABLES
   ============================================================ */

#markdownBody table {
    border-collapse: collapse;
    width: 100%;
    font-size: 0.9em;
    font-feature-settings: 'lnum' 1, 'tnum' 1;
    font-variant-numeric: lining-nums tabular-nums;
}

#markdownBody th,
#markdownBody td {
    border: 1px solid var(--border);
    padding: 0.4em 0.75em;
    text-align: left;
}

#markdownBody th {
    font-family: var(--font-sans);
    font-weight: 600;
    background-color: var(--bg-offset);
}


/* ============================================================
   ABSTRACT BLOCK
   ============================================================ */

.abstract {
    font-size: 0.95em;
    margin: 1.65rem 0 3.3rem 0; /* Baseline grid */
    padding-left: 1.5em;
    border-left: 2px solid var(--border);
    color: var(--text-muted);
}

.abstract p + p {
    text-indent: 0;
    margin-top: 0.825rem; /* Half line-height */
}


/* ============================================================
   MATHEMATICS (KaTeX)
   Display math is scaled slightly below body size so long equations
   fit within the 680px column. KaTeX uses em units throughout its
   output, so font-size here cascades and scales all rendered glyphs.
   Inline math (.katex without .katex-display) is unaffected.
   overflow-x: auto is a safety net for anything still too wide.
   ============================================================ */

.katex-display {
    font-size: 0.85em;
    overflow-x: auto;
    overflow-y: hidden;
}


/* ============================================================
   PROOF ENVIRONMENT
   Traditional mathematical proof styling.
   ============================================================ */

.proof {
    margin: 1.65rem 0;
}

/* "Proof." label — italic bold, matching LaTeX convention */
.proof-label {
    font-style: italic;
    font-weight: 600;
}

/* Paragraphs inside proof: no extra indent after first */
.proof p + p {
    text-indent: 0;
    margin-top: 0.825rem;
}

/* QED tombstone — floated right so it sits at the end of the last line */
.proof-qed {
    float: right;
    margin-left: 1em;
    font-style: normal;
}


/* ============================================================
   SMALLCAPS UTILITY
   ============================================================ */

.smallcaps {
    font-variant-caps: all-small-caps;
    letter-spacing: 0.03em;
}


/* ============================================================
   EXTERNAL LINK ICONS
   Uses data-link-icon attribute set at build time by Filters/Links.hs.
   mask-image renders the SVG in currentColor so icons adapt to dark/light mode.
   ============================================================ */

a[data-link-icon-type="svg"]::after {
    content: '';
    display: inline-block;
    width:  0.75em;
    height: 0.75em;
    margin-left: 0.2em;
    vertical-align: 0.05em;
    background-color: currentColor;
    mask-size: contain;
    mask-repeat: no-repeat;
    mask-position: center;
    -webkit-mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    -webkit-mask-position: center;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

a[data-link-icon-type="svg"]:hover::after {
    opacity: 0.8;
}

a[data-link-icon="external"]::after {
    mask-image: url('/images/link-icons/external.svg');
    -webkit-mask-image: url('/images/link-icons/external.svg');
}

a[data-link-icon="wikipedia"]::after {
    mask-image: url('/images/link-icons/wikipedia.svg');
    -webkit-mask-image: url('/images/link-icons/wikipedia.svg');
}

a[data-link-icon="arxiv"]::after {
    mask-image: url('/images/link-icons/arxiv.svg');
    -webkit-mask-image: url('/images/link-icons/arxiv.svg');
}

a[data-link-icon="doi"]::after {
    mask-image: url('/images/link-icons/doi.svg');
    -webkit-mask-image: url('/images/link-icons/doi.svg');
}

a[data-link-icon="github"]::after {
    mask-image: url('/images/link-icons/github.svg');
    -webkit-mask-image: url('/images/link-icons/github.svg');
}