custom.css

/* ── Notebook (myst-nb) source/output: borderless, blend with the page ── */
:root {
    --mystnb-source-margin-color: transparent;
    --mystnb-source-border-color: transparent;
    --mystnb-source-bg-color: transparent;
    --mystnb-source-border-width: 0;
    --mystnb-stdout-margin-color: transparent;
    --mystnb-stderr-margin-color: transparent;

    /* shibuya 2026.5.19 dropped --sy-c-accent in favor of the Radix-style
     * --accent-9 / --accent-a3 palette (driven by theme_options.accent_color).
     * Re-export the old name so our custom.css (and ::selection background)
     * keeps working without rewriting every reference. */
    --sy-c-accent: var(--accent-9);
}

/* Text selection — soft accent tint */
::selection {
    background-color: color-mix(in srgb, var(--sy-c-accent) 25%, transparent);
    color: inherit;
}

/* ── Typography ── */
article h2 {
    border-bottom: 2px solid var(--sy-c-divider);
    padding-bottom: 0.4em;
    margin-top: 2.5rem;
}

article h3 {
    border-bottom: 1px solid color-mix(in srgb, var(--sy-c-accent) 25%, transparent);
    padding-bottom: 0.3em;
    margin-top: 2rem;
}

article hr {
    border: none;
    border-top: 2px solid var(--sy-c-divider);
    margin: 3rem 0;
}

article p {
    line-height: 1.7;
}

article table td code {
    white-space: nowrap;
}

/* ── All code blocks (markdown + notebooks) ── */
.highlight > pre,
pre.literal-block {
    border: none !important;
    box-shadow: none !important;
    border-radius: 8px;
}

.code-block-caption {
    border: none;
}

/* Notebook cells — no left border, same look as markdown code blocks */
div.cell,
div.cell > div.cell_input,
div.cell > div.cell_output {
    border: none !important;
    border-left: none !important;
}

/* Inline code */
code.literal,
code.docutils {
    background: var(--sy-c-surface, #f6f8fa);
    border: 1px solid var(--sy-c-divider, #d0d7de);
    border-radius: 4px;
    padding: 0.15em 0.35em;
    font-size: 0.88em;
}

html.dark code.literal,
html.dark code.docutils {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.12);
}

/* ── Header ── */
.sy-head {
    border-bottom: 2px solid var(--sy-c-accent);
}

/* ── Sidebar ── */
.sy-lside {
    background: var(--sy-c-foot-background);
    border-right: 1px solid var(--sy-c-divider);
}

.sy-sidebar-toc a.current {
    color: var(--sy-c-accent) !important;
    font-weight: 600;
}

/* Allow long dotted FQNs to wrap in the sidebar instead of clipping */
.sy-sidebar-toc,
.sy-sidebar-toc ul,
.sy-sidebar-toc li {
    overflow: visible;
}

.sy-lside a {
    white-space: normal;
    word-break: break-word;
}

/* Reset code font in sidebar nav — prevents identifier-titled pages
 * (e.g. generate_composite_decl) from rendering in monospace */
.sy-lside a code {
    font-family: inherit;
    font-size: inherit;
    background: none;
    border: none;
    padding: 0;
}

/* ── Tables ── */
article table {
    border: 1px solid var(--sy-c-divider);
    border-radius: 6px;
    border-collapse: separate;
    border-spacing: 0;
    width: 100%;
    overflow: hidden;
}

article table thead th {
    background: color-mix(in srgb, var(--sy-c-accent) 8%, transparent);
    border-bottom: 2px solid color-mix(in srgb, var(--sy-c-accent) 25%, transparent);
    font-weight: 600;
    padding: 0.6em 1em;
}

article table td,
article table th {
    padding: 0.6em 1em;
    border-bottom: 1px solid var(--sy-c-divider);
}

/* ── Admonitions ── */
article .admonition {
    border-radius: 6px;
    border-left-width: 4px;
}

article .admonition.warning {
    border-left-color: var(--sy-c-accent);
}

/* ── Version switcher ── */
.version-switcher {
    position: relative;
    display: flex;
    align-items: center;
    margin-right: 0.75rem;
}

.version-switcher__btn {
    background: none;
    border: 1px solid var(--sy-c-border, #d0d7de);
    border-radius: 6px;
    padding: 0.3em 0.8em;
    font-size: 0.85rem;
    cursor: pointer;
    color: inherit;
    white-space: nowrap;
    transition: border-color 0.15s;
}

.version-switcher__btn:hover {
    border-color: var(--sy-c-accent);
}

.version-switcher__btn::after {
    content: " \25BE";
}

.version-switcher__list {
    position: absolute;
    left: 0;
    top: 100%;
    margin-top: 4px;
    padding: 0.4rem 0;
    list-style: none;
    background: var(--sy-c-background, #fff);
    border: 1px solid var(--sy-c-divider, #d0d7de);
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    z-index: 100;
    min-width: 10rem;
}

html.dark .version-switcher__list {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.version-switcher__list a {
    display: block;
    padding: 0.35em 1em;
    text-decoration: none;
    color: inherit;
    font-size: 0.85rem;
    white-space: nowrap;
    transition: background 0.12s;
}

.version-switcher__list a:hover {
    background: var(--sy-c-surface, #f6f8fa);
}

.version-switcher__list a[aria-current="true"] {
    font-weight: 600;
    color: var(--sy-c-accent);
}

/* ── Copy-page button ── */

/* The copy-page button is absolutely positioned at the top-right of the
 * article on lg+ breakpoints, so any wide first-child content extends
 * underneath it. Reserve right padding to avoid overlap. */
@media (min-width: 1024px) {
    .copy-page-wrapper + .yue > p:first-child,
    .copy-page-wrapper + .yue > section:first-of-type > p:first-child,
    .copy-page-wrapper + .yue > section:first-of-type > h1:first-of-type {
        padding-right: 11rem;
    }
}

/* The wrapper's padding and invisible area must not capture mouse events —
 * only the visible interactive children (buttons, links) should. */
.copy-page-wrapper {
    pointer-events: none;
}

.copy-page-wrapper > * {
    pointer-events: auto;
}

/* The copy-page dropdown's Markdown icon is loaded as <img> from
 * _static/icons/. In <img> context an SVG's fill="currentColor" defaults to
 * black, so invert in dark mode to keep contrast against the dark dropdown. */
html.dark #copy-page-content img {
    filter: invert(1);
}