/* Lettuce reader theme — system-native typography, light/dark via prefers-color-scheme. */

:root {
    color-scheme: light dark;
    --content-width: 38rem;     /* ~68ch — comfortable measure for long-form prose */
    --header-height: 3.25rem;

    --bg: #ffffff;
    --fg: #1d1d1f;
    --fg-secondary: #4f4f55;    /* AA-comfortable on white */
    --rule: #e3e3e6;
    --accent: #2f6feb;
    --code-bg: #f5f5f7;
    --code-fg: #1d1d1f;
    --mark: #fff3b0;
    --table-stripe: #fafafa;

    --callout-note: #2f6feb;
    --callout-tip: #1aa251;
    --callout-warning: #d98b0b;
    --callout-danger: #e5484d;
    --callout-ai: #7a47e0;
    --callout-abstract: #06a5c0;
    --callout-question: #cf8a00;
    --callout-example: #8250df;
    --callout-quote: #8b949e;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1c1c1e;
        --fg: #e8e8ed;
        --fg-secondary: #b3b3ba;
        --rule: #3a3a3d;
        --accent: #5e9bff;
        --code-bg: #2a2a2e;
        --code-fg: #e8e8ed;
        --mark: #5c5320;
        --table-stripe: #232326;
    }
}

html { -webkit-text-size-adjust: 100%; }

body {
    font: 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
    margin: 0;
    color: var(--fg);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

/* Selection picks up the theme accent instead of the browser default. */
::selection { background: color-mix(in srgb, var(--accent) 26%, transparent); }

.lettuce-content {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 2.5rem clamp(1rem, 4vw, 2.5rem) 6rem;
}

/* Metadata bar */
.lettuce-meta { margin-bottom: 2rem; }
.lettuce-title {
    font-size: clamp(1.7rem, 1.3rem + 1.6vw, 2.1rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.01em;
    margin: 0 0 0.5rem;
}
.lettuce-byline { color: var(--muted, #6b7280); font-size: 0.9rem; margin: 0 0 0.5rem; }
.lettuce-description { color: var(--muted, #6b7280); font-size: 1.02rem; line-height: 1.5; margin: 0 0 0.75rem; font-style: italic; }
.lettuce-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.lettuce-tag {
    font-size: 0.8rem;
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    padding: 0.1rem 0.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    cursor: pointer;
}
.lettuce-tag:hover { background: color-mix(in srgb, var(--accent) 22%, transparent); }

/* Inline #tags in body prose — subtler than the header chips. */
.lettuce-tag-inline {
    color: var(--accent);
    text-decoration: none;
    cursor: pointer;
}
.lettuce-tag-inline:hover { text-decoration: underline; }

/* Headings */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.25;
    letter-spacing: -0.01em;
    margin: 1.5rem 0 0.6rem;
    scroll-margin-top: calc(var(--header-height) + 0.75rem);  /* clear the sticky header */
}
h1 { font-size: 1.7rem; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; }
h5, h6 { font-size: 1rem; color: var(--fg-secondary); }

p { margin: 0.9rem 0; }

a { color: var(--accent); text-decoration: none; cursor: pointer; }
a:hover { text-decoration: underline; }

/* Wikilinks */
a.wikilink { color: var(--accent); border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
a.wikilink.unresolved { color: var(--callout-danger); border-bottom-style: dashed; }
.embed-placeholder {
    border: 1px dashed var(--rule);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    color: var(--fg-secondary);
    margin: 1rem 0;
}
img.wikilink-embed, img { max-width: 100%; height: auto; border-radius: 0.4rem; }

/* Lists */
ul, ol { padding-left: 1.5rem; }
li { margin: 0.25rem 0; }
/* The task text renders as a block <p>; flex centers the checkbox with the text regardless of the
   line-height (clean for the common single-line task). */
li.task-list-item { display: flex; align-items: center; list-style: none; margin-left: -1.2rem; }
li.task-list-item > p { margin: 0; }

/* Code */
code {
    font-family: "SF Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.88em;
    background: var(--code-bg);
    color: var(--code-fg);
    padding: 0.12em 0.35em;
    border-radius: 0.3rem;
}
pre {
    background: var(--code-bg);
    border-radius: 0.6rem;
    padding: 1rem 1.1rem;
    overflow-x: auto;
    line-height: 1.5;
}
pre code { background: none; padding: 0; font-size: 0.85rem; }

/* Blockquotes */
blockquote {
    margin: 1rem 0;
    padding: 0.2rem 0 0.2rem 1rem;
    border-left: 3px solid var(--rule);
    color: var(--fg-secondary);
}

/* Callouts */
.callout {
    margin: 1.2rem 0;
    border: 1px solid var(--rule);
    border-left: 3px solid var(--callout-note);
    border-radius: 0.5rem;
    background: color-mix(in srgb, var(--callout-note) 7%, var(--bg));
    overflow: hidden;
}
.callout-title {
    font-weight: 600;
    padding: 0.6rem 1rem;
    color: var(--callout-note);
}
.callout-body { padding: 0 1rem 0.6rem; }
.callout-body > :first-child { margin-top: 0; }
.callout-body > :last-child { margin-bottom: 0; }
.callout-tip, .callout-success { border-left-color: var(--callout-tip); background: color-mix(in srgb, var(--callout-tip) 7%, var(--bg)); }
.callout-tip .callout-title, .callout-success .callout-title { color: var(--callout-tip); }
.callout-warning, .callout-caution { border-left-color: var(--callout-warning); background: color-mix(in srgb, var(--callout-warning) 7%, var(--bg)); }
.callout-warning .callout-title, .callout-caution .callout-title { color: var(--callout-warning); }
.callout-danger, .callout-error, .callout-bug { border-left-color: var(--callout-danger); background: color-mix(in srgb, var(--callout-danger) 7%, var(--bg)); }
.callout-ai { border-left-color: var(--callout-ai); background: color-mix(in srgb, var(--callout-ai) 7%, var(--bg)); }
.callout-ai .callout-title { color: var(--callout-ai); }
.callout-ai .callout-title::before { content: "✦ "; }
.callout-ai-done { border-left-color: var(--callout-tip); background: color-mix(in srgb, var(--callout-tip) 5%, var(--bg)); opacity: 0.78; }
.callout-ai-done .callout-title { color: var(--callout-tip); }
.callout-ai-done .callout-title::before { content: "✓ "; }
.callout-danger .callout-title, .callout-error .callout-title, .callout-bug .callout-title { color: var(--callout-danger); }
/* Additional Obsidian callout types (parsing accepts any [!type]; these get a distinct colour). */
.callout-info, .callout-todo { border-left-color: var(--callout-note); background: color-mix(in srgb, var(--callout-note) 7%, var(--bg)); }
.callout-info .callout-title, .callout-todo .callout-title { color: var(--callout-note); }
.callout-abstract, .callout-summary, .callout-tldr, .callout-important { border-left-color: var(--callout-abstract); background: color-mix(in srgb, var(--callout-abstract) 7%, var(--bg)); }
.callout-abstract .callout-title, .callout-summary .callout-title, .callout-tldr .callout-title, .callout-important .callout-title { color: var(--callout-abstract); }
.callout-question, .callout-help, .callout-faq { border-left-color: var(--callout-question); background: color-mix(in srgb, var(--callout-question) 7%, var(--bg)); }
.callout-question .callout-title, .callout-help .callout-title, .callout-faq .callout-title { color: var(--callout-question); }
.callout-example { border-left-color: var(--callout-example); background: color-mix(in srgb, var(--callout-example) 7%, var(--bg)); }
.callout-example .callout-title { color: var(--callout-example); }
.callout-quote, .callout-cite { border-left-color: var(--callout-quote); background: color-mix(in srgb, var(--callout-quote) 7%, var(--bg)); }
.callout-quote .callout-title, .callout-cite .callout-title { color: var(--callout-quote); }
.callout-failure, .callout-missing { border-left-color: var(--callout-danger); background: color-mix(in srgb, var(--callout-danger) 7%, var(--bg)); }
.callout-failure .callout-title, .callout-missing .callout-title { color: var(--callout-danger); }

/* Tables */
table { border-collapse: collapse; width: 100%; margin: 1.2rem 0; font-size: 0.95rem; }
th, td { border: 1px solid var(--rule); padding: 0.45rem 0.7rem; text-align: left; }
thead th { background: var(--code-bg); font-weight: 600; }
tbody tr:nth-child(even) { background: var(--table-stripe); }

hr { border: none; border-top: 1px solid var(--rule); margin: 2rem 0; }

/* Index page: subtle vertical stack of rows with hairline dividers. */
ul.site-index {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0 0;
    border-top: 1px solid var(--rule);
}
ul.site-index li {
    margin: 0;
    border-bottom: 1px solid var(--rule);
}
ul.site-index a {
    display: block;
    padding: 0.85rem 0.25rem;
    font-size: 1.02rem;
    color: var(--fg);
    text-decoration: none;
    transition: background-color 80ms ease;
}
ul.site-index a:hover {
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 6%, transparent);
}

del { color: var(--fg-secondary); }
mark { background: var(--mark); }

/* Mermaid container */
pre.mermaid { background: transparent; text-align: center; }

/* (editor autocomplete + CodeMirror styles live in the editor page, not here) */

/* Footnotes */
sup.footnote-ref { font-size: 0.7em; line-height: 0; }
sup.footnote-ref a { text-decoration: none; padding: 0 0.1em; }
.footnotes { margin-top: 3rem; font-size: 0.9rem; color: var(--fg-secondary); }
.footnotes hr { margin-bottom: 1rem; }
.footnotes li { margin: 0.4rem 0; }
.footnote-backref { text-decoration: none; }

/* Responsive: phones / narrow windows. Tables get horizontal scroll instead of
   overflowing the page, code-block padding tightens, and body font drops a notch. */
@media (max-width: 640px) {
    body { font-size: 16px; line-height: 1.6; }
    .lettuce-content { padding: 1.5rem 1rem 4rem; }
    .lettuce-meta { margin-bottom: 1.25rem; }
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1.1rem; }
    table { display: block; overflow-x: auto; max-width: 100%; }
    pre { padding: 0.85rem 0.9rem; }
}

@media (prefers-reduced-motion: reduce) {
    ul.site-index a { transition: none; }
    .lettuce-section-head::before { transition: none; }
}

/* ── Enhanced publish: table of contents + collapsible, numbered sections ──
   Emitted by MarkdownRenderer.renderEnhanced for notes with `enhance: true`. */
.lettuce-enhanced { counter-reset: lettuce-section; }

.lettuce-toc {
    margin: 1.25rem 0 2rem;
    padding: 0.85rem 1.1rem;
    border: 1px solid var(--rule);
    border-radius: 9px;
    background: color-mix(in srgb, var(--fg) 3%, transparent);
}
.lettuce-toc-title {
    font-size: 0.72rem; font-weight: 700; letter-spacing: 0.06em;
    text-transform: uppercase; color: var(--fg-secondary); margin-bottom: 0.45rem;
}
.lettuce-toc ul { list-style: none; margin: 0; padding: 0; }
.lettuce-toc li { margin: 0.18rem 0; line-height: 1.4; }
.lettuce-toc li.toc-l3 { padding-left: 1.15rem; font-size: 0.95em; }
.lettuce-toc a { color: var(--fg); border: 0; }
.lettuce-toc a:hover { color: var(--accent); }

.lettuce-section {
    border-top: 1px solid var(--rule);
    margin: 0;
    scroll-margin-top: calc(var(--header-height) + 0.75rem);
}
.lettuce-section:last-of-type { border-bottom: 1px solid var(--rule); }

/* Summary = the clickable heading row. Hide the native marker, add a rotating chevron. */
.lettuce-section-head {
    cursor: pointer; list-style: none;
    display: flex; align-items: baseline; gap: 0.5rem;
    padding: 0.5rem 0;
}
.lettuce-section-head::-webkit-details-marker { display: none; }
.lettuce-section-head::before {
    content: "›"; color: var(--fg-secondary); font-size: 1.15em; line-height: 1;
    transition: transform 0.15s ease; transform: translateY(0.05em);
}
.lettuce-section[open] > .lettuce-section-head::before { transform: translateY(0.05em) rotate(90deg); }
.lettuce-section-head:hover { color: var(--accent); }

/* Auto-numbered section titles (1., 2., …) via a CSS counter — no markup churn. */
.lettuce-section-title {
    counter-increment: lettuce-section;
    display: inline; margin: 0; border: 0;
}
.lettuce-section-title::before {
    content: counter(lettuce-section) ".\00a0";
    color: var(--fg-secondary); font-weight: 600;
}
/* The collapsed rows must read as one uniform list even though each keeps its original heading
   element (h1 vs h2 vs h3 — the plan preserves the author's levels), so normalize the size. */
.lettuce-section-head .lettuce-section-title { font-size: 1.15rem; }
/* A heading that contains a link (e.g. a [[wikilink]] title) must not paint the collapsed row
   accent-blue — the row reads as a toggle, not a link. */
.lettuce-section-head a { color: inherit; }
/* One-line AI summary shown in a collapsed section's header; hidden once expanded (the full
   AI-summary block in the body takes over). Keeps collapsed sections skimmable. */
.lettuce-section-teaser {
    flex: 1 1 auto; min-width: 0;
    color: var(--fg-secondary); font-weight: 400; font-size: 0.85em;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.lettuce-section[open] > .lettuce-section-head .lettuce-section-teaser { display: none; }
.lettuce-section-body { padding: 0 0 0.5rem 1.55rem; }
.lettuce-section-body > :first-child { margin-top: 0.25rem; }

/* AI-generated summary / key-points — clearly labeled, visually distinct from the prose. */
.lettuce-ai {
    border-left: 3px solid var(--accent);
    background: color-mix(in srgb, var(--accent) 7%, transparent);
    padding: 0.55rem 0.8rem;
    border-radius: 0 7px 7px 0;
    margin: 0 0 0.9rem;
    font-size: 0.95em;
}
.lettuce-ai-doc { margin: 1rem 0 1.75rem; }
.lettuce-ai-label {
    font-size: 0.68rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase;
    color: var(--accent); margin-bottom: 0.3rem;
}
.lettuce-ai p { margin: 0.2rem 0; }
.lettuce-ai ul { margin: 0.3rem 0 0; padding-left: 1.15rem; }
.lettuce-ai li { margin: 0.12rem 0; }

/* Inlined `![[note]]` embed — the target note's body, set off from the host note. */
.lettuce-embed {
    border-left: 3px solid var(--rule);
    padding: 0.1rem 0 0.1rem 1rem;
    margin: 1rem 0;
}
.lettuce-embed > :first-child { margin-top: 0; }
.lettuce-embed-missing { color: var(--fg-secondary); font-style: italic; font-size: 0.92em; }

/* Resolved `query`/`dataview` block — a generated table/list of matching notes. */
ul.lettuce-query { margin: 1.2rem 0; }
.lettuce-query-empty { color: var(--fg-secondary); }

/* ════════════════════════════════════════════════════════════════════════
   Visual enhancements — shared by the in-app reader, the published site, and
   QuickLook (copy buttons are JS-injected, so they appear everywhere but QL).
   ════════════════════════════════════════════════════════════════════════ */

/* Callout type icons — masked line icons tinted to the callout's own color. */
.callout-title { display: flex; align-items: center; gap: 0.5em; }
.callout-title::before {
    content: ""; flex: 0 0 auto; width: 1.05em; height: 1.05em;
    background: currentColor;
    -webkit-mask: var(--callout-icon) center / contain no-repeat;
    mask: var(--callout-icon) center / contain no-repeat;
}
.callout { --callout-icon: url("data:image/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20viewBox%3D%270%200%2024%2024%27%20fill%3D%27none%27%20stroke%3D%27black%27%20stroke-width%3D%272%27%20stroke-linecap%3D%27round%27%20stroke-linejoin%3D%27round%27%3E%3Ccircle%20cx%3D%2712%27%20cy%3D%2712%27%20r%3D%2710%27%2F%3E%3Cline%20x1%3D%2712%27%20y1%3D%2716%27%20x2%3D%2712%27%20y2%3D%2712%27%2F%3E%3Cline%20x1%3D%2712%27%20y1%3D%278%27%20x2%3D%2712.01%27%20y2%3D%278%27%2F%3E%3C%2Fsvg%3E"); }
.callout-tip, .callout-success { --callout-icon: url("data:image/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20viewBox%3D%270%200%2024%2024%27%20fill%3D%27none%27%20stroke%3D%27black%27%20stroke-width%3D%272%27%20stroke-linecap%3D%27round%27%20stroke-linejoin%3D%27round%27%3E%3Cpath%20d%3D%27M22%2011.08V12a10%2010%200%201%201-5.93-9.14%27%2F%3E%3Cpolyline%20points%3D%2722%204%2012%2014.01%209%2011.01%27%2F%3E%3C%2Fsvg%3E"); }
.callout-warning, .callout-caution { --callout-icon: url("data:image/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20viewBox%3D%270%200%2024%2024%27%20fill%3D%27none%27%20stroke%3D%27black%27%20stroke-width%3D%272%27%20stroke-linecap%3D%27round%27%20stroke-linejoin%3D%27round%27%3E%3Cpath%20d%3D%27M10.29%203.86%201.82%2018a2%202%200%200%200%201.71%203h16.94a2%202%200%200%200%201.71-3L13.71%203.86a2%202%200%200%200-3.42%200z%27%2F%3E%3Cline%20x1%3D%2712%27%20y1%3D%279%27%20x2%3D%2712%27%20y2%3D%2713%27%2F%3E%3Cline%20x1%3D%2712%27%20y1%3D%2717%27%20x2%3D%2712.01%27%20y2%3D%2717%27%2F%3E%3C%2Fsvg%3E"); }
.callout-danger, .callout-error, .callout-bug { --callout-icon: url("data:image/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20viewBox%3D%270%200%2024%2024%27%20fill%3D%27none%27%20stroke%3D%27black%27%20stroke-width%3D%272%27%20stroke-linecap%3D%27round%27%20stroke-linejoin%3D%27round%27%3E%3Cpolygon%20points%3D%277.86%202%2016.14%202%2022%207.86%2022%2016.14%2016.14%2022%207.86%2022%202%2016.14%202%207.86%27%2F%3E%3Cline%20x1%3D%2712%27%20y1%3D%278%27%20x2%3D%2712%27%20y2%3D%2712%27%2F%3E%3Cline%20x1%3D%2712%27%20y1%3D%2716%27%20x2%3D%2712.01%27%20y2%3D%2716%27%2F%3E%3C%2Fsvg%3E"); }

/* Code blocks — language label (CSS, so QuickLook gets it too) + copy button (JS). */
pre { position: relative; }
pre[data-lang] { padding-top: 1.9rem; }
pre[data-lang]::before {
    content: attr(data-lang);
    position: absolute; top: 0; left: 0;
    font: 600 0.68rem/1 "SF Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    letter-spacing: 0.04em; text-transform: uppercase; color: var(--fg-secondary);
    background: color-mix(in srgb, var(--fg) 6%, transparent);
    padding: 0.32rem 0.6rem; border-radius: 0.6rem 0 0.5rem 0;
}
.copy-btn {
    position: absolute; top: 0.4rem; right: 0.4rem;
    font: 600 0.7rem/1 -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    color: var(--fg-secondary); background: color-mix(in srgb, var(--fg) 7%, var(--bg));
    border: 1px solid var(--rule); border-radius: 0.4rem; padding: 0.28rem 0.5rem;
    cursor: pointer; opacity: 0; transition: opacity 0.12s ease, color 0.12s ease;
}
pre:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { color: var(--fg); }
.copy-btn.copied { color: var(--callout-tip); border-color: var(--callout-tip); }
@media (hover: none) { .copy-btn { opacity: 1; } }

/* Typography polish */
h1, h2, h3, h4, h5, h6 { text-wrap: balance; }
p, li { text-wrap: pretty; }
a:hover { text-underline-offset: 0.16em; text-decoration-thickness: 0.08em; }
:where(a, button, input, summary):focus-visible {
    outline: 2px solid color-mix(in srgb, var(--accent) 60%, transparent);
    outline-offset: 2px; border-radius: 3px;
}
kbd {
    font: 0.82em/1 "SF Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    background: var(--code-bg); color: var(--code-fg);
    border: 1px solid var(--rule); border-bottom-width: 2px;
    border-radius: 0.4em; padding: 0.1em 0.42em; white-space: nowrap;
}

/* Tables — rounded scroll container with row hover + scroll affordance. */
.lettuce-table {
    margin: 1.2rem 0; overflow-x: auto;
    border: 1px solid var(--rule); border-radius: 0.6rem;
}
.lettuce-table table { margin: 0; border: 0; width: auto; min-width: 100%; display: table; }
.lettuce-table th, .lettuce-table td { border-width: 0 1px 1px 0; }
.lettuce-table tr > :last-child { border-right: 0; }
.lettuce-table tbody tr:last-child > * { border-bottom: 0; }
.lettuce-table tbody tr { transition: background-color 80ms ease; }
.lettuce-table tbody tr:hover { background: color-mix(in srgb, var(--accent) 8%, transparent); }

/* Figures — standalone images with a caption from their alt text. */
figure { margin: 1.6rem 0; text-align: center; }
figure img { margin: 0 auto; box-shadow: 0 1px 12px rgba(0,0,0,0.10); }
figcaption { margin-top: 0.55rem; font-size: 0.86rem; color: var(--fg-secondary); }

/* Blockquote — accent-tinted border + a faint quotation mark. */
blockquote {
    position: relative; padding: 0.4rem 0 0.4rem 1.5rem;
    border-left: 3px solid color-mix(in srgb, var(--accent) 35%, var(--rule));
}
blockquote::before {
    content: "\201C"; position: absolute; left: 0.45rem; top: 0.05rem;
    font: 1.5rem/1 Georgia, "Times New Roman", serif;
    color: color-mix(in srgb, var(--accent) 45%, transparent);
}

/* ════════════════ Round 2: foldable callouts, collapsibles, code power, links ════════════════ */
:root { --lettuce-chevron: url("data:image/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20viewBox%3D%270%200%2024%2024%27%20fill%3D%27none%27%20stroke%3D%27black%27%20stroke-width%3D%272.5%27%20stroke-linecap%3D%27round%27%20stroke-linejoin%3D%27round%27%3E%3Cpolyline%20points%3D%279%206%2015%2012%209%2018%27%2F%3E%3C%2Fsvg%3E"); }

/* Foldable callouts — the title row becomes a clickable <summary> with a rotating chevron. */
details.callout > summary.callout-title { cursor: pointer; list-style: none; }
details.callout > summary.callout-title::-webkit-details-marker { display: none; }
details.callout > summary.callout-title::after {
    content: ""; margin-left: auto; flex: 0 0 auto; width: 0.9em; height: 0.9em;
    background: currentColor; opacity: 0.7;
    -webkit-mask: var(--lettuce-chevron) center / contain no-repeat;
    mask: var(--lettuce-chevron) center / contain no-repeat;
    transition: transform 0.15s ease;
}
details.callout[open] > summary.callout-title::after { transform: rotate(90deg); }

/* Native authored <details> collapsibles (not callouts, not enhanced sections). */
.lettuce-content details:not(.callout):not(.lettuce-section) {
    border: 1px solid var(--rule); border-radius: 0.5rem; margin: 1rem 0; padding: 0 0.95rem;
    background: color-mix(in srgb, var(--fg) 2.5%, transparent);
}
.lettuce-content details:not(.callout):not(.lettuce-section) > summary {
    cursor: pointer; list-style: none; font-weight: 600;
    display: flex; align-items: center; gap: 0.5em; padding: 0.6rem 0;
}
.lettuce-content details:not(.callout):not(.lettuce-section) > summary::-webkit-details-marker { display: none; }
.lettuce-content details:not(.callout):not(.lettuce-section) > summary::before {
    content: ""; flex: 0 0 auto; width: 0.85em; height: 0.85em;
    background: currentColor; opacity: 0.55;
    -webkit-mask: var(--lettuce-chevron) center / contain no-repeat;
    mask: var(--lettuce-chevron) center / contain no-repeat;
    transition: transform 0.15s ease;
}
.lettuce-content details:not(.callout):not(.lettuce-section)[open] > summary::before { transform: rotate(90deg); }
.lettuce-content details:not(.callout):not(.lettuce-section) > :last-child { margin-bottom: 0.85rem; }

/* Code: filename caption + line-number gutter + highlight bands + soft-wrap toggle. */
pre { isolation: isolate; }
pre[data-file]::before { content: attr(data-file); text-transform: none; letter-spacing: 0; }
pre.has-ln { padding-left: 3.4rem; }
.ln-gutter {
    position: absolute; left: 0; top: 0; width: 2.6rem; box-sizing: border-box; padding-right: 0.7rem;
    text-align: right; color: var(--fg-secondary); opacity: 0.55; border-right: 1px solid var(--rule);
    white-space: pre; font: inherit; user-select: none; -webkit-user-select: none; pointer-events: none;
}
.code-hl-band {
    position: absolute; left: 0; right: 0; z-index: -1;
    background: color-mix(in srgb, var(--accent) 13%, transparent); pointer-events: none;
}
pre.wrap > code { white-space: pre-wrap; overflow-wrap: anywhere; }
pre.wrap .ln-gutter, pre.wrap .code-hl-band { display: none; }
pre.wrap.has-ln { padding-left: 1.1rem; }
.wrap-btn {
    position: absolute; bottom: 0.4rem; right: 0.4rem;
    font: 600 0.7rem/1 -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    color: var(--fg-secondary); background: color-mix(in srgb, var(--fg) 7%, var(--bg));
    border: 1px solid var(--rule); border-radius: 0.4rem; padding: 0.24rem 0.5rem;
    cursor: pointer; opacity: 0; transition: opacity 0.12s ease, color 0.12s ease;
}
pre:hover .wrap-btn, .wrap-btn:focus-visible { opacity: 1; }
.wrap-btn:hover { color: var(--fg); }

/* External-link arrow. */
.lettuce-content a.external::after {
    content: "\2197"; font-size: 0.74em; margin-left: 0.1em; vertical-align: 0.2em; color: var(--fg-secondary);
}

/* Task lists — accent checkbox; completed item dimmed + struck through. */
li.task-list-item input[type="checkbox"] {
    accent-color: var(--accent); width: 1.1em; height: 1.1em;
    flex: 0 0 auto; margin: 0 0.45rem 0 0; cursor: pointer;
}
li.task-list-item:has(input:checked) {
    color: var(--fg-secondary); text-decoration: line-through;
    text-decoration-color: color-mix(in srgb, var(--fg-secondary) 55%, transparent);
}
/* Interactive checkboxes (reader + dashboards): show they're clickable. */
input.lc-task { cursor: pointer; accent-color: var(--accent); }

/* `tasks` query result — a clickable cross-note task list. */
.lettuce-tasks-result ul.lc-tasks { list-style: none; padding-left: 0; margin: 0.6rem 0; }
.lettuce-tasks-result li.lc-task-item { display: flex; align-items: center; flex-wrap: wrap; margin: 0.2rem 0; line-height: 1.5; }
.lettuce-tasks-result li.lc-task-item input.lc-task { flex: 0 0 auto; margin-right: 0.45rem; width: 1.1em; height: 1.1em; }
.lettuce-tasks-result li.lc-task-done .lc-task-text {
    color: var(--fg-secondary); text-decoration: line-through;
    text-decoration-color: color-mix(in srgb, var(--fg-secondary) 55%, transparent);
}
.lettuce-tasks-result .lc-task-due { color: var(--fg-secondary); font-size: 0.85em; }
.lettuce-tasks-result .lc-task-note { color: var(--fg-secondary); font-size: 0.85em; }
.lettuce-tasks-result .lc-task-group { margin: 0.8rem 0; }
.lettuce-tasks-result .lc-task-group-title { font-weight: 600; margin-bottom: 0.2rem; }

/* Long URLs / unbreakable strings shouldn't blow out the measure. */
.lettuce-content { overflow-wrap: break-word; }

/* Hover popover (footnote previews; reused by the site's wikilink peeks). */
.footnote-popover {
    position: absolute; z-index: 40; max-width: 22rem;
    font-size: 0.86rem; line-height: 1.45; color: var(--fg); background: var(--bg);
    border: 1px solid var(--rule); border-radius: 0.55rem; padding: 0.55rem 0.75rem;
    box-shadow: 0 8px 28px rgba(0,0,0,0.18);
}
.footnote-popover > :first-child { margin-top: 0; }
.footnote-popover > :last-child { margin-bottom: 0; }
.footnote-popover p { margin: 0.2rem 0; }
.footnote-popover .footnote-backref { display: none; }

@media (prefers-reduced-motion: reduce) {
    details.callout > summary.callout-title::after,
    .lettuce-content details > summary::before { transition: none; }
}

/* ════════════════ Round 3: math/diagram sizing, lightbox, motion, dark-mode ════════════════ */

/* Wide display math scrolls instead of overflowing; Mermaid diagrams scale down to fit. */
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 2px 0; }
pre.mermaid { margin: 1.3rem 0; }
pre.mermaid svg { max-width: 100%; height: auto; }
/* Data-driven charts: the chart renderer swaps the JSON spec for an inline <svg>. */
pre.lettuce-chart { background: transparent; text-align: center; margin: 1.3rem 0; }
pre.lettuce-chart.lettuce-chart-rendered { padding: 0; border: none; white-space: normal; }
pre.lettuce-chart svg { max-width: 100%; height: auto; }

/* Click-to-zoom image lightbox (JS adds the overlay + zoom-in cursor). */
.lettuce-lightbox {
    position: fixed; inset: 0; z-index: 100; display: none;
    align-items: center; justify-content: center; padding: 4vmin;
    background: rgba(0,0,0,0.82); cursor: zoom-out;
}
.lettuce-lightbox.open { display: flex; }
.lettuce-lightbox img {
    max-width: 96%; max-height: 92vh; border-radius: 0.4rem;
    box-shadow: 0 12px 48px rgba(0,0,0,0.5);
}

/* Smooth in-page anchor scrolling (respecting reduced-motion). */
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

/* Dark mode: drop shadows tuned for light backgrounds read as nothing — use borders / deeper shadow. */
@media (prefers-color-scheme: dark) {
    figure img { box-shadow: none; border: 1px solid var(--rule); }
    .footnote-popover { box-shadow: 0 10px 34px rgba(0,0,0,0.6); }
    .lettuce-lightbox img { box-shadow: 0 12px 48px rgba(0,0,0,0.7); }
}

/* ════════════════ Round 4: type flourishes + view transitions ════════════════ */

/* Subtle, safe OpenType niceties for prose (degrade gracefully where unsupported). */
.lettuce-content { hanging-punctuation: first allow-end; font-variant-ligatures: common-ligatures contextual; }
.lettuce-content p, .lettuce-content li { font-variant-numeric: oldstyle-nums proportional-nums; }
.lettuce-content code, .lettuce-content pre, .lettuce-content table, .lettuce-pubmeta, .ln-gutter { font-variant-numeric: normal; }

/* Opt-in decorative drop cap (frontmatter `dropcap: true`). */
.lettuce-content.dropcap > p:first-of-type::first-letter {
    float: left; font-size: 3.1em; line-height: 0.82; font-weight: 600;
    padding: 0.04em 0.12em 0 0; color: var(--accent);
}

/* Smooth same-origin page morphs on the published site (cross-document View Transitions).
   No effect in the single-page in-app reader; ignored by browsers that don't support it. */
@view-transition { navigation: auto; }
@media (prefers-reduced-motion: reduce) { @view-transition { navigation: none; } }