@import url("https://fonts.googleapis.com/css2?family=Instrument+Serif&family=Inter:wght@400;500;600;700&display=swap");

/* =====================================================================
   Research Daily: theme layer (RD_ENGINE 2.1) on top of Material for MkDocs.

   Design rules (keep them when editing):
   1. A lesson is a click-through: one question and one drawing per screen,
      with a step rail that reveals one short step at a time.
   2. Colour means something: blue = data and the paper's facts, violet =
      learned parts, green = good/correct, amber = the thing to look at now,
      teal = speech, red = a problem. The highlighter yellow marks progress
      and the quick tour.
   3. Everything else stays quiet: ink on paper.
   ===================================================================== */

/* ---------- palette -------------------------------------------------- */
:root,
[data-md-color-scheme="default"] {
  --md-primary-fg-color: #1f2a44;
  --md-primary-fg-color--light: #36456b;
  --md-primary-fg-color--dark: #141c30;
  --md-primary-bg-color: #ffffff;
  --md-accent-fg-color: #2b5fb3;
  --md-typeset-a-color: #2457a8;

  --rd-paper: #2b5fb3;
  --rd-code: #1e7b4f;
  --rd-take: #8a3fb8;
  --rd-predict: #b06400;
  --rd-bridge: #0b7c88;
  --rd-deep: #5b6475;
  --rd-hl: #ffd84d;
  --rd-hl-soft: rgba(255, 216, 77, 0.55);
  --rd-rule: rgba(31, 42, 68, 0.14);
  --rd-surface: rgba(31, 42, 68, 0.035);
}

[data-md-color-scheme="slate"] {
  --md-hue: 222;
  --md-primary-fg-color: #1a2238;
  --md-primary-fg-color--light: #2a3553;
  --md-primary-fg-color--dark: #121829;
  --md-accent-fg-color: #8ab4f8;
  --md-typeset-a-color: #8ab4f8;

  --rd-paper: #7fa8f0;
  --rd-code: #5cc08e;
  --rd-take: #c08bea;
  --rd-predict: #f0a443;
  --rd-bridge: #4cc3cf;
  --rd-deep: #9aa3b5;
  --rd-hl: #d9b73a;
  --rd-hl-soft: rgba(217, 183, 58, 0.34);
  --rd-rule: rgba(226, 232, 245, 0.14);
  --rd-surface: rgba(226, 232, 245, 0.04);
}

/* ---------- type ----------------------------------------------------- */
.md-typeset {
  font-size: 0.84rem;
  line-height: 1.72;
}
.md-typeset h2 {
  font-weight: 650;
  letter-spacing: -0.01em;
  margin-top: 2.4em;
}
.md-typeset h3 { font-weight: 620; }
.md-typeset h1 {
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--md-default-fg-color);
  margin-bottom: 0.6em;
}
.md-typeset p,
.md-typeset li { max-width: 46rem; }
.rd-muted { color: var(--md-default-fg-color--light); }
.rd-small { font-size: 0.72rem; }


:root, [data-md-color-scheme="default"] { --rd-bad: #c2410c; }
[data-md-color-scheme="slate"] { --rd-bad: #f08a5d; }

/* difficulty dots */
.rd-dots { display: inline-flex; gap: 3px; vertical-align: middle; margin-right: 0.35rem; }
.rd-dots i {
  width: 0.5rem; height: 0.5rem; border-radius: 50%;
  border: 1px solid var(--md-default-fg-color--light);
}
.rd-dots i.on { background: var(--md-default-fg-color); border-color: var(--md-default-fg-color); }

/* ---------- homepage ------------------------------------------------- */
.rd-hero { margin: 0.5rem 0 2.2rem; max-width: 40rem; }
.md-typeset .rd-hero h1 {
  font-size: 2.3rem;
  line-height: 1.1;
  margin: 0 0 0.6rem;
}
.rd-hero__lede { font-size: 1.02rem; line-height: 1.6; }

.rd-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15.5rem, 1fr));
  gap: 1rem;
  margin: 1rem 0 2rem;
}
.md-typeset a.rd-tile {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.95rem 1rem 1rem;
  border: 1px solid var(--rd-rule);
  border-top: 3px solid var(--md-primary-fg-color);
  border-radius: 2px 2px 6px 6px;
  color: var(--md-default-fg-color);
  background: var(--md-default-bg-color);
  position: relative;
}
[data-md-color-scheme="slate"] .md-typeset a.rd-tile { border-top-color: var(--rd-paper); }
.md-typeset a.rd-tile:hover,
.md-typeset a.rd-tile:focus-visible {
  border-color: var(--md-accent-fg-color);
  color: var(--md-default-fg-color);
}
.rd-tile__added { font-size: 0.66rem; color: var(--md-default-fg-color--light); }
.rd-tile__title { font-size: 1.05rem; font-weight: 700; line-height: 1.25; }
.rd-tile__full { font-size: 0.7rem; color: var(--md-default-fg-color--light); line-height: 1.35; }
.rd-tile__hook { font-size: 0.78rem; line-height: 1.5; margin-top: 0.2rem; flex: 1; }
.rd-tile__meta { font-size: 0.68rem; display: flex; align-items: center; margin-top: 0.3rem; }
.rd-tile__tags { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.rd-tag {
  font-size: 0.62rem;
  padding: 0.05rem 0.45rem;
  border-radius: 999px;
  border: 1px solid var(--rd-rule);
  color: var(--md-default-fg-color--light);
}
.rd-tile__done {
  display: none;
  position: absolute; top: 0.8rem; right: 0.9rem;
  font-size: 0.64rem; color: var(--rd-code);
}
.rd-tile.is-done .rd-tile__done { display: block; }
.rd-tile.is-done .rd-tile__done::before { content: "✓ "; }


/* Theme-aware SVG helpers: use these classes inside hand-drawn SVGs so
   they follow the light/dark toggle. (CSS variables do not work in SVG
   presentation attributes, so classes or style="" are required.) */
.rd-svg text { font-family: var(--md-text-font-family); fill: var(--md-default-fg-color); }
.rd-svg .mono { font-family: var(--md-code-font-family); }
.rd-svg .f-ink { fill: var(--md-default-fg-color); }
.rd-svg .f-muted { fill: var(--md-default-fg-color--light); }
.rd-svg .f-faint { fill: var(--md-default-fg-color--lightest); }
.rd-svg .f-bg { fill: var(--md-default-bg-color); }
.rd-svg .f-surface { fill: var(--rd-surface); }
.rd-svg .f-paper { fill: var(--rd-paper); }
.rd-svg .f-code { fill: var(--rd-code); }
.rd-svg .f-take { fill: var(--rd-take); }
.rd-svg .f-predict { fill: var(--rd-predict); }
.rd-svg .f-bridge { fill: var(--rd-bridge); }
.rd-svg .f-hl { fill: var(--rd-hl-soft); }
.rd-svg .f-none { fill: none; }
.rd-svg .s-ink { stroke: var(--md-default-fg-color); }
.rd-svg .s-muted { stroke: var(--md-default-fg-color--light); }
.rd-svg .s-faint { stroke: var(--md-default-fg-color--lighter); }
.rd-svg .s-paper { stroke: var(--rd-paper); }
.rd-svg .s-code { stroke: var(--rd-code); }
.rd-svg .s-take { stroke: var(--rd-take); }
.rd-svg .s-predict { stroke: var(--rd-predict); }
.rd-svg .s-bridge { stroke: var(--rd-bridge); }
.rd-svg .t-paper { fill: var(--rd-paper); }
.rd-svg .t-code { fill: var(--rd-code); }
.rd-svg .t-take { fill: var(--rd-take); }
.rd-svg .t-predict { fill: var(--rd-predict); }
.rd-svg .t-bridge { fill: var(--rd-bridge); }
.rd-svg .t-muted { fill: var(--md-default-fg-color--light); }
.rd-svg .soft { fill-opacity: 0.16; }
.rd-svg .softer { fill-opacity: 0.08; }


/* Programming ligatures in JetBrains Mono turn token syntax like <|en|> into
   triangle glyphs, which misleads readers of papers about tokens. Show the
   characters as typed everywhere. */
.md-typeset code,
.md-typeset pre,
.md-typeset kbd,
.rd-svg .mono,
.rd-widget .mono,
.rd-widget output,
.rd-widget [class*="chip"] {
  font-variant-ligatures: none;
  font-feature-settings: "liga" 0, "calt" 0;
}

.rd-svg .f-bad { fill: var(--rd-bad); }
.rd-svg .s-bad { stroke: var(--rd-bad); }
.rd-svg .t-bad { fill: var(--rd-bad); }
.rd-svg .t-ink { fill: var(--md-default-fg-color); }
.rd-svg .rdx-dim { opacity: 0.22; }
.rd-svg .rdx-hl rect, .rd-svg rect.rdx-hl { filter: drop-shadow(0 0 3px color-mix(in srgb, var(--rd-predict) 55%, transparent)); }


/* =====================================================================
   Explainer v2: click-through lessons that fit one screen (explainer.js)

   The lesson is a fixed frame under the site header. Left: crumb, the
   question, the drawing (which grows to fill the space). Right: the steps,
   the takeaway, Back/Next. The page never scrolls; only the step list may,
   inside its own panel. Phones get the drawing on top and the current step
   as a bottom sheet.
   ===================================================================== */
:root, [data-md-color-scheme="default"] {
  --rdx-fig-bg: color-mix(in srgb, #1f2a44 3%, #ffffff);
  --rdx-panel: color-mix(in srgb, #1f2a44 1.5%, #ffffff);
  --rdx-ink-btn: #1b2337;
  --rdx-serif: "Instrument Serif", "Literata", Georgia, "Times New Roman", serif;
  --rdx-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --rdx-top: 2.4rem;
}
[data-md-color-scheme="slate"] {
  --rdx-fig-bg: color-mix(in srgb, var(--md-default-fg-color) 4%, var(--md-default-bg-color));
  --rdx-panel: color-mix(in srgb, var(--md-default-fg-color) 2%, var(--md-default-bg-color));
  --rdx-ink-btn: #e8ecf5;
}

/* SVG text: a sans for labels, measured by the kit; halo keeps lines from
   striking through free-floating labels. */
.rdx-svg text { font-family: var(--rdx-sans); }
.rdx-svg text.mono, .rdx-svg .mono { font-family: var(--md-code-font-family); }
.rd-svg text.halo { paint-order: stroke fill; stroke: var(--rdx-fig-bg); stroke-width: 3.5px; stroke-linejoin: round; }
.rd-svg .f-figbg { fill: var(--rdx-fig-bg); }
.rd-svg .s-bg { stroke: var(--rdx-fig-bg); }
.rd-svg .rdx-under { stroke: none; }
.rdx-svg.rdx-stepped .rdx-new { animation: rdxIn 0.42s ease-out backwards; }
@keyframes rdxIn { from { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .rdx-svg.rdx-stepped .rdx-new { animation: none; } }

/* ---- the frame -------------------------------------------------------- */
body.rdx-on:not(.rdx-all) { overflow: hidden; }
body.rdx-on:not(.rdx-all) :is(.md-sidebar, .md-footer, .md-top, .md-source-file) { display: none !important; }
body.rdx-on:not(.rdx-all) .md-content__inner > .md-tags { display: none; }

.rdx {
  position: fixed; top: var(--rdx-top); left: 0; right: 0; bottom: 0; z-index: 3;
  display: flex; flex-direction: column; background: var(--md-default-bg-color);
  font-family: var(--rdx-sans);
}
.rdx-bar {
  flex: none; display: flex; align-items: center; gap: 0.5rem 0.6rem;
  padding: 0.4rem clamp(0.8rem, 2vw, 1.6rem); font-size: 0.62rem;
  border-bottom: 1px solid var(--rd-rule);
}
.rdx-spacer { flex: 1; }
.rdx-menubtn, .rdx-modebtn, .rdx-allbtn {
  font: inherit; font-weight: 600; color: inherit; background: transparent; cursor: pointer; white-space: nowrap;
  border: 1px solid var(--rd-rule); border-radius: 999px; padding: 0.28rem 0.8rem;
}
.rdx-menubtn:hover, .rdx-modebtn:hover, .rdx-allbtn:hover { border-color: var(--md-default-fg-color--light); }
.rdx-where { color: var(--md-default-fg-color--light); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.rdx-count { font-family: var(--md-code-font-family); color: var(--md-default-fg-color--light); font-variant-numeric: tabular-nums; min-width: 3.2em; text-align: right; }
.rdx-progress { flex: none; height: 3px; background: transparent; overflow: hidden; }
.rdx-progress i { display: block; height: 100%; width: 0; background: var(--rd-hl); transition: width 0.25s ease; }

.rdx-stage { flex: 1; min-height: 0; position: relative; width: 100%; max-width: 104rem; margin: 0 auto; }
.rdx article.rd-page { display: none; }
.rdx article.rd-page.is-on {
  display: grid; grid-template-columns: minmax(0, 1fr) clamp(18rem, 27vw, 24rem);
  height: 100%; min-height: 0;
}
.rdx-main { display: flex; flex-direction: column; min-width: 0; min-height: 0; padding: 0.9rem clamp(0.8rem, 2vw, 1.6rem) 0.9rem; }
.rdx-head { flex: none; }

.md-typeset .rd-crumb {
  font-family: var(--rdx-sans); font-size: 0.6rem; line-height: 1.4; color: var(--md-default-fg-color--light);
  margin: 0 0 0.3rem; max-width: none;
}
.md-typeset .rd-crumb b {
  display: inline-block; margin-right: 0.45rem; padding: 0.06rem 0.55rem;
  border-radius: 999px; background: var(--md-default-fg-color); color: var(--md-default-bg-color); font-weight: 600;
}
.md-typeset .rdx-main h2 {
  font-family: var(--rdx-serif); font-weight: 400; letter-spacing: -0.012em;
  font-size: clamp(1.3rem, 2.15vw, 2.05rem); line-height: 1.06; margin: 0.15rem 0 0.65rem;
  max-width: 44ch; text-wrap: balance;
}
.md-typeset .rdx-main h2 .headerlink { display: none; }

.rdx-figbox {
  flex: 1; min-height: 0; display: flex; flex-direction: column;
  border: 1px solid var(--rd-rule); border-radius: 18px; padding: 0.7rem 0.9rem 0.6rem; background: var(--rdx-fig-bg);
}
.rdx-ctl { flex: none; display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem 1.1rem; margin-bottom: 0.45rem; font-size: 0.62rem; }
.rdx-ctl[hidden] { display: none; }
.rdx-slider { display: inline-flex; align-items: center; gap: 0.5rem; }
.rdx-slider span, .rdx-seglabel { white-space: nowrap; color: var(--md-default-fg-color--light); font-weight: 600; }
.rdx-slider input { accent-color: var(--rd-paper); width: min(12rem, 40vw); }
.rdx-read { font-family: var(--md-code-font-family); font-size: 0.62rem; font-variant-ligatures: none; font-variant-numeric: tabular-nums; }
.rdx-seg { display: inline-flex; border: 1px solid var(--rd-rule); border-radius: 999px; padding: 2px; gap: 2px; max-width: 100%; overflow-x: auto; scrollbar-width: none; background: var(--md-default-bg-color); }
.rdx-seg button { flex: none; font: inherit; font-weight: 600; padding: 0.2rem 0.7rem; border: 0; border-radius: 999px; background: transparent; color: inherit; cursor: pointer; }
.rdx-seg button[aria-pressed="true"] { background: var(--md-default-fg-color); color: var(--md-default-bg-color); }
.rdx-fig { flex: 1; min-height: 0; position: relative; }
.rdx-fig > svg { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.rdx-fig.is-static { overflow: auto; }
.rdx-fig .rd-static { overflow: auto; }
.rdx-fig .rd-static pre { margin: 0; }
.md-typeset .rdx-figbox .rd-cap, .md-typeset .rdx-main > .rd-cap {
  flex: none; font-family: var(--rdx-sans); font-size: 0.56rem; line-height: 1.45; color: var(--md-default-fg-color--light);
  margin: 0.45rem 0 0; max-width: none;
}
.rdx-missing { color: var(--rd-bad); font-size: 0.75rem; }

/* ---- the step panel ---------------------------------------------------- */
.rdx-rail { display: flex; flex-direction: column; min-width: 0; min-height: 0; border-left: 1px solid var(--rd-rule); background: var(--rdx-panel); }
.md-typeset ol.rdx-steps { flex: 1 1 auto; min-height: 0; overflow-y: auto; list-style: none; counter-reset: rdx; margin: 0; padding: 0.8rem 0.8rem 0.4rem; scrollbar-width: thin; }
.md-typeset ol.rdx-steps > li {
  counter-increment: rdx; position: relative; margin: 0 0 0.2rem; max-width: none;
  padding: 0.5rem 0.75rem 0.5rem 2.25rem; border-radius: 12px; border: 1px solid transparent;
  font-size: 0.8rem; line-height: 1.55;
}
.md-typeset ol.rdx-steps > li::before {
  content: attr(data-n); position: absolute; left: 0.65rem; top: 0.55rem;
  width: 1.05rem; height: 1.05rem; border-radius: 50%; display: grid; place-items: center;
  font: 700 0.55rem/1 var(--rdx-sans); color: var(--md-default-fg-color--light); border: 1px solid var(--rd-rule);
}
.md-typeset ol.rdx-steps > li.is-done::before { content: "✓"; color: var(--rd-code); border-color: color-mix(in srgb, var(--rd-code) 45%, transparent); }
.md-typeset ol.rdx-steps > li.is-cur::before { background: var(--md-default-fg-color); color: var(--md-default-bg-color); border-color: var(--md-default-fg-color); }
.rdx-st { cursor: pointer; font-family: var(--rdx-sans); font-weight: 600; font-size: 0.74rem; }
.rdx-sb { display: none; margin-top: 0.3rem; font-size: 0.8rem; text-wrap: pretty; }
.rdx-sb > p { margin: 0.3rem 0 0; }
.md-typeset ol.rdx-steps > li.is-cur { background: var(--md-default-bg-color); border-color: var(--rd-rule); box-shadow: 0 1px 0 var(--rd-rule); }
.md-typeset ol.rdx-steps > li.is-cur .rdx-st { font-size: 0.82rem; }
.md-typeset ol.rdx-steps > li.is-cur .rdx-sb, .rdx[data-layout="all"] .rdx-sb { display: block; }
.md-typeset ol.rdx-steps > li.is-todo .rdx-st { color: var(--md-default-fg-color--light); font-weight: 500; }
.md-typeset ol.rdx-steps > li.is-done .rdx-st { color: var(--md-default-fg-color--light); font-weight: 500; }
.md-typeset ol.rdx-steps > li.is-take.is-cur { border: 1px dashed var(--rd-take); }
.md-typeset ol.rdx-steps > li.is-code.is-cur { border-left: 3px solid var(--rd-code); }
.rdx-voice {
  display: inline-block; margin-right: 0.4rem; padding: 0 0.45rem; border-radius: 999px;
  font: 600 0.52rem/1.6 var(--rdx-sans); vertical-align: 0.12em; border: 1px solid var(--rd-take); color: var(--rd-take);
}
li.is-code .rdx-voice { border-color: var(--rd-code); color: var(--rd-code); }
.rdx-ref { font-family: var(--md-code-font-family); font-size: 0.56rem; color: var(--md-default-fg-color--light); white-space: nowrap; font-variant-ligatures: none; }
.rdx-stat { display: flex; align-items: baseline; gap: 0.6rem; margin: 0.55rem 0 0.1rem; padding: 0.45rem 0.7rem; border-radius: 10px; background: var(--rdx-fig-bg); }
.rdx-stat b { font: 700 1.35rem/1.1 var(--rdx-sans); color: var(--rd-paper); font-variant-numeric: tabular-nums; white-space: nowrap; }
.rdx-stat span { font-size: 0.6rem; line-height: 1.35; color: var(--md-default-fg-color--light); }

.rdx .rd-take { display: none; }
.md-typeset .rdx .rd-take.is-shown, .md-typeset .rdx[data-layout="all"] .rd-take {
  display: block; flex: none; margin: 0.3rem 0.8rem 0.6rem; padding: 0.65rem 0.8rem; border-radius: 12px; max-width: none;
  font-size: 0.74rem; line-height: 1.5;
  background: color-mix(in srgb, var(--rd-code) 10%, var(--md-default-bg-color));
  border: 1px solid color-mix(in srgb, var(--rd-code) 38%, transparent);
}
.md-typeset .rdx .rd-take.bad.is-shown { background: color-mix(in srgb, var(--rd-bad) 9%, var(--md-default-bg-color)); border-color: color-mix(in srgb, var(--rd-bad) 42%, transparent); }
.md-typeset .rd-take b:first-child { display: block; margin-bottom: 0.15rem; font-family: var(--rdx-sans); }

.rdx-nav { flex: none; display: flex; align-items: center; gap: 0.5rem; padding: 0.6rem 0.8rem; border-top: 1px solid var(--rd-rule); }
.rdx-pos { flex: 1; font-family: var(--md-code-font-family); font-size: 0.56rem; color: var(--md-default-fg-color--light); font-variant-numeric: tabular-nums; }
.rdx-dots { display: none; gap: 0.3rem; flex: 1; flex-wrap: wrap; }
.rdx-dots button { width: 1.2rem; height: 1.2rem; padding: 0; border-radius: 50%; border: 1px solid var(--rd-rule); background: transparent; color: var(--md-default-fg-color--light); font: 600 0.5rem/1 var(--rdx-sans); cursor: pointer; }
.rdx-dots button.is-done { background: var(--rd-rule); }
.rdx-dots button.is-cur { background: var(--rd-hl); color: #141312; border-color: var(--rd-hl); }
.rdx-back, .rdx-next {
  font: 600 0.68rem/1 var(--rdx-sans); cursor: pointer; padding: 0.55rem 1rem; border-radius: 999px;
  border: 1px solid var(--rd-rule); background: transparent; color: var(--md-default-fg-color);
}
.rdx-next { background: var(--rdx-ink-btn); color: var(--md-default-bg-color); border-color: var(--rdx-ink-btn); min-width: 6.2rem; }
.rdx-next::after { content: " →"; }
.rdx-next.is-page { background: var(--rd-hl); color: #141312; border-color: var(--rd-hl); }
.rdx-back::before { content: "← "; }
.rdx-back:disabled { opacity: 0.35; cursor: default; }
:is(.rdx-back, .rdx-next, .rdx-opt, .rdx-st, .rdx-menubtn, .rdx-modebtn, .rdx-allbtn, .rdx-dots button, .rdx-link):focus-visible { outline: 2px solid var(--md-accent-fg-color); outline-offset: 2px; }

/* ---- quiz pages: one centred column ------------------------------------- */
.rdx article.rd-page.is-quiz.is-on { grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr) auto; }
.rdx .is-quiz .rdx-main { width: 100%; max-width: 44rem; margin: 0 auto; overflow-y: auto; padding-top: 2rem; }
.rdx .is-quiz .rdx-rail { border-left: 0; border-top: 1px solid var(--rd-rule); }
.rdx .is-quiz .rdx-nav { border-top: 0; width: 100%; max-width: 44rem; margin: 0 auto; }
.rdx-quiz { display: flex; flex-direction: column; gap: 0.45rem; margin-top: 0.4rem; }
.rdx-opt {
  font: 400 0.78rem/1.45 var(--md-text-font-family, serif); text-align: left; cursor: pointer;
  padding: 0.7rem 0.9rem; border-radius: 12px; border: 1px solid var(--rd-rule);
  background: var(--md-default-bg-color); color: var(--md-default-fg-color);
}
.rdx-opt:hover:not(:disabled) { border-color: var(--md-default-fg-color--light); }
.rdx-opt:disabled { cursor: default; }
.rdx-opt.is-right { border-color: var(--rd-code); background: color-mix(in srgb, var(--rd-code) 12%, var(--md-default-bg-color)); }
.rdx-opt.is-wrong { border-color: var(--rd-bad); background: color-mix(in srgb, var(--rd-bad) 10%, var(--md-default-bg-color)); }
.md-typeset .is-quiz .rd-take.is-shown { margin: 0.9rem 0 0; }

/* ---- cover ------------------------------------------------------------ */
.rdx article.rd-cover.is-on { display: block; height: 100%; overflow-y: auto; padding: 1.6rem clamp(0.8rem, 3vw, 2.4rem) 2rem; }
.md-typeset .rd-cover h1 { font-family: var(--rdx-serif); font-weight: 400; font-size: clamp(2rem, 4.4vw, 3.6rem); line-height: 1; letter-spacing: -0.02em; margin: 0.4rem 0 0.7rem; max-width: 20ch; text-wrap: balance; }
.md-typeset .rd-cover .rd-cover__idea { font-size: 0.95rem; line-height: 1.55; max-width: 40rem; margin: 0 0 1rem; }
.rd-cover__go { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 0.4rem 0 1.4rem; }
.rd-cover__go button {
  font: 600 0.72rem/1 var(--rdx-sans); cursor: pointer; padding: 0.7rem 1.15rem; border-radius: 999px;
  border: 1px solid var(--md-default-fg-color); background: transparent; color: var(--md-default-fg-color);
}
.rd-cover__go button.is-primary { background: var(--rdx-ink-btn); border-color: var(--rdx-ink-btn); color: var(--md-default-bg-color); }
.rd-cover__go button small { font-weight: 400; opacity: 0.75; margin-left: 0.3rem; }
.rd-cover__parts { display: grid; grid-template-columns: repeat(auto-fill, minmax(12.5rem, 1fr)); gap: 0.7rem; margin: 0 0 1.4rem; }
.rd-cover__part { border: 1px solid var(--rd-rule); border-radius: 14px; padding: 0.7rem 0.85rem; font-size: 0.68rem; background: var(--rdx-panel); }
.rd-cover__part b { display: block; font-family: var(--rdx-sans); font-size: 0.78rem; }
.rd-cover__part span { color: var(--md-default-fg-color--light); }
.rd-cover__facts { display: grid; grid-template-columns: max-content 1fr; gap: 0.2rem 1rem; font-size: 0.66rem; margin: 0; }
.md-typeset .rd-cover__facts dt { color: var(--md-default-fg-color--light); font-weight: 500; }
.md-typeset .rd-cover__facts dd { margin: 0; }

/* ---- page drawer ------------------------------------------------------ */
.rdx-drawer {
  position: absolute; top: 0; left: 0; bottom: 0; z-index: 10; width: min(22rem, 88vw); overflow-y: auto;
  background: var(--md-default-bg-color); border-right: 1px solid var(--rd-rule);
  box-shadow: 0 0 0 100vmax rgba(10, 14, 24, 0.32); padding: 0.8rem 0.6rem 1rem; font-size: 0.66rem;
}
.rdx-drawer[hidden] { display: none; }
.rdx-drawer-head b { display: block; font: 400 1.05rem/1.1 var(--rdx-serif); padding: 0 0.4rem 0.6rem; }
.rdx-find { width: 100%; font: inherit; color: inherit; padding: 0.45rem 0.8rem; border-radius: 999px; border: 1px solid var(--rd-rule); background: var(--rdx-panel); }
.rdx-part { margin: 0.9rem 0.4rem 0.2rem; font-weight: 700; color: var(--md-default-fg-color--light); }
.md-typeset a.rdx-link { display: grid; grid-template-columns: 1.6rem 1fr auto; gap: 0.3rem; align-items: baseline; padding: 0.35rem 0.4rem; border-radius: 8px; color: var(--md-default-fg-color); line-height: 1.3; }
.md-typeset a.rdx-link:hover { background: var(--rdx-panel); }
.rdx-link em { font-style: normal; font-family: var(--md-code-font-family); color: var(--md-default-fg-color--light); font-size: 0.58rem; }
.rdx-link.is-seen em::after { content: " ✓"; color: var(--rd-code); }
.md-typeset a.rdx-link.is-cur { background: var(--md-default-fg-color); color: var(--md-default-bg-color); }
.rdx-link.is-cur em { color: inherit; }
.rdx-link.is-off { opacity: 0.4; }
.rdx-link[hidden] { display: none; }
.rdx-keys { margin: 1rem 0.4rem 0; color: var(--md-default-fg-color--light); line-height: 1.9; }
.rdx-keys kbd { font-size: 0.56rem; }

/* ---- read as one page --------------------------------------------------- */
.rdx[data-layout="all"] { position: static; z-index: auto; }
.rdx[data-layout="all"] .rdx-stage { max-width: none; }
.rdx[data-layout="all"] article.rd-page { display: grid; grid-template-columns: minmax(0, 1fr) minmax(16rem, 21rem); height: auto; border-bottom: 1px solid var(--rd-rule); padding-bottom: 1rem; }
.rdx[data-layout="all"] article.rd-cover { display: block; }
.rdx[data-layout="all"] .rdx-fig > svg { position: static; height: auto; }
.rdx[data-layout="all"] .rdx-fig { flex: none; }
.rdx[data-layout="all"] .rdx-nav, .rdx[data-layout="all"] .rdx-menubtn { display: none; }
.rdx[data-layout="all"] ol.rdx-steps { overflow: visible; }

/* ---- short screens ------------------------------------------------------ */
@media screen and (max-height: 720px) and (min-width: 44.01em) {
  .md-typeset .rdx-main h2 { font-size: clamp(1.15rem, 1.8vw, 1.6rem); margin-bottom: 0.45rem; }
  .rdx-main { padding-top: 0.6rem; padding-bottom: 0.6rem; }
  .md-typeset ol.rdx-steps > li { padding-top: 0.4rem; padding-bottom: 0.4rem; }
  .rdx-sb, .md-typeset ol.rdx-steps > li { font-size: 0.74rem; }
}

/* ---- tablets and phones: drawing on top, current step as a bottom sheet -- */
@media screen and (max-width: 60em) {
  .rdx article.rd-page.is-on { grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr) auto; }
  .rdx-rail { border-left: 0; border-top: 1px solid var(--rd-rule); max-height: min(50dvh, 28rem); box-shadow: 0 -8px 24px rgba(10, 14, 24, 0.06); }
  .md-typeset ol.rdx-steps { padding: 0.5rem 0.7rem 0.2rem; }
  .md-typeset ol.rdx-steps > li:not(.is-cur) { display: none; }
  .md-typeset ol.rdx-steps > li.is-cur { background: transparent; border-color: transparent; box-shadow: none; padding-left: 2.05rem; }
  .rdx-dots { display: flex; }
  .rdx-pos { display: none; }
  .md-typeset .rdx .rd-take.is-shown { margin: 0 0.7rem 0.5rem; }
  .rdx-allbtn { display: none; }
  .rdx-nav { padding: 0.5rem 0.7rem calc(0.5rem + env(safe-area-inset-bottom, 0px)); }
}
@media screen and (max-width: 44em) {
  .rdx-bar { padding: 0.35rem 0.6rem; gap: 0.4rem; }
  .rdx-where { display: none; }
  .rdx-main { padding: 0.55rem 0.6rem 0.5rem; }
  .md-typeset .rdx-main h2 { font-size: 1.12rem; margin-bottom: 0.4rem; }
  .rdx-figbox { padding: 0.45rem 0.45rem 0.4rem; border-radius: 14px; }
  .rdx-fig { cursor: zoom-in; }
  .rdx-fig.is-zoomed { overflow: auto; cursor: zoom-out; }
  .rdx-fig.is-zoomed > svg { position: static; width: 640px; height: auto; max-width: none; }
  .rdx-figbox .rd-cap::after { content: " Tap the drawing to zoom."; }
  .md-typeset .rdx-figbox .rd-cap { font-size: 0.52rem; }
  .rdx-sb, .md-typeset ol.rdx-steps > li { font-size: 0.76rem; }
  .rdx-back { font-size: 0; padding: 0.55rem 0.85rem; }
  .rdx-back::before { content: "←"; font-size: 0.72rem; }
  .rdx-dots { flex-wrap: nowrap; overflow: hidden; gap: 0.22rem; }
  .rdx-dots button { width: 1.05rem; height: 1.05rem; flex: none; }
  .rd-cover__facts { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { .rdx-progress i { transition: none; } }