/*
 * ArbiStocks docs.css (owner: docs). The three parestocks-shaped reading pages in typesafe skin:
 *   /docs      sidebar + long page      (body[data-page="docs"], teal-grey ground like typesafe's blog)
 *   /security  review page              (body[data-page="security"], pink ground)
 *   /deck      keyboard slides          (body[data-page="deck"], ink ground)
 * Loaded after css/base.css; uses its tokens (--pink, --ink, --paper, --grey-1/2, --teal, --magenta ...), its
 * breakpoints (1439 / 1199 / 809) and its components (.os-window, .os-label, .frame-corners, .dot-grid, .faq).
 */

/* ============================================================== shared: page head (typesafe blog header) */

.doc-top { padding: 36px var(--page-pad) 0; }
.doc-band {
  position: relative;
  height: 350px;
  overflow: hidden;
  isolation: isolate;
}
.doc-band__blob {
  position: absolute;
  z-index: 0;
  width: 1800px;
  max-width: none;
  height: 1800px;
  mix-blend-mode: multiply;
  pointer-events: none;
  image-rendering: pixelated;
}
.doc-band__blob--a { left: calc(9% - 900px); bottom: -880px; }
.doc-band__blob--b { left: calc(50% - 900px); bottom: -1060px; }
.doc-band__blob--c { left: calc(93% - 900px); bottom: -820px; }
.doc-band__win { position: absolute; z-index: 1; }

.doc-head {
  max-width: var(--container);
  margin: 59px auto 0;
  padding: 20px 20px 30px;
  text-align: center;
}
.doc-head__meta { display: flex; flex-direction: column; align-items: center; gap: 18px; }
.doc-head__date { font: 400 13px/1 var(--font-mono); letter-spacing: 0.02em; color: var(--ink-86); }
.doc-title { margin-top: 30px; }
.doc-sub { max-width: 800px; margin: 36px auto 0; text-wrap: pretty; }
.doc-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 30px; }

/* inline icons in buttons and links */
.ico { width: 14px; height: 14px; flex: none; }

/* ============================================================== shared: live values */

.live { font-family: var(--font-mono); font-weight: 400; font-variant-numeric: tabular-nums; letter-spacing: 0; }
.live.is-loading { color: color-mix(in srgb, currentColor 78%, transparent); animation: live-blink 1.2s steps(2, jump-none) infinite; } /* dimmed from the ground's own colour, so it holds on paper and on ink */
@keyframes live-blink { 50% { opacity: 0.45; } }
.live-note { font: 300 12px/1.3 var(--font-mono); letter-spacing: 0.03em; color: inherit; opacity: 0.8; }
.live-note:empty { display: none; }

.kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; align-items: baseline; }
.kv dt { font: 500 18px/1 var(--font-pixel); letter-spacing: 0.01em; white-space: nowrap; }
.kv dd { margin: 0; justify-self: end; text-align: right; font: 400 15px/1.1 var(--font-mono); font-variant-numeric: tabular-nums; }

/* ============================================================== shared: section heads and prose */

.doc-sec { scroll-margin-top: 24px; }
.doc-sec + .doc-sec { margin-top: 120px; }
.doc-sec__head { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; margin-bottom: 30px; }
.doc-h2 { font: 500 var(--fs-h2)/0.9 var(--font-display); letter-spacing: 0; color: var(--ink-86); text-transform: capitalize; text-wrap: balance; }
.doc-h3 { margin-top: 44px; font: 500 var(--fs-h5)/1.2 var(--font-display); letter-spacing: 0; color: var(--ink-86); }
.doc-h3 + p, .doc-h3 + .doc-list { margin-top: 12px; }

.prose { font: 400 17px/1.3 var(--font-body); letter-spacing: 0.05em; color: var(--ink-86); }
.prose p { margin-top: 18px; text-wrap: pretty; }
.prose > :first-child, .prose .doc-sec__head + p { margin-top: 0; }
.prose strong, .prose b { font-weight: 700; color: var(--ink); }
.prose em { font-style: italic; }
.prose a:not(.btn):not(.os-window):not(.cta-link) {
  text-decoration: underline;
  text-decoration-thickness: 1.2px;
  text-underline-offset: 4px;
  transition: text-decoration-thickness 0.5s var(--ease), color 0.5s var(--ease);
}
.prose a:not(.btn):not(.os-window):not(.cta-link):hover { text-decoration-thickness: 3px; color: var(--ink); }
.prose :not(pre) > code, .code-inline {
  padding: 1px 4px 2px;
  background: rgba(254, 254, 254, 0.55);
  color: var(--ink);
  font: 400 0.84em/1 var(--font-mono);
  letter-spacing: 0;
  overflow-wrap: anywhere;
}
.doc-list { margin-top: 18px; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 10px; }
.doc-list > li { position: relative; padding-left: 22px; }
.doc-list > li::before { content: ''; position: absolute; left: 3px; top: 0.42em; width: 7px; height: 7px; background: var(--ink); }
ol.doc-list { counter-reset: step; }
ol.doc-list > li { padding-left: 34px; counter-increment: step; }
ol.doc-list > li::before {
  content: counter(step);
  top: 0.05em;
  left: 0;
  width: auto;
  height: auto;
  padding: 1px 4px 3px;
  background: var(--ink);
  color: var(--pink);
  font: 500 14px/1 var(--font-pixel);
}

/* block spacing inside prose */
.prose .os-window, .prose .doc-flow, .prose .doc-note, .prose .doc-faq, .prose .doc-gloss, .prose .doc-grid2 { margin-top: 30px; }

/* ============================================================== shared: windows used as blocks */

/* code window */
.code-win .os-window__bar { align-items: center; }
.code-win__copy {
  flex: none;
  padding: 0 5px 2px;
  background: var(--grey-1);
  color: var(--ink);
  font: 500 15px/1.2 var(--font-pixel);
  letter-spacing: 0.02em;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}
.code-win__copy:hover { background: var(--magenta); color: var(--paper); }
.code-win pre {
  margin: 0;
  padding: 14px 16px 16px;
  overflow-x: auto;
  font: 400 13px/1.6 var(--font-mono);
  letter-spacing: 0;
  color: var(--paper);
  tab-size: 2;
  scrollbar-width: thin;
  scrollbar-color: var(--grey-3) transparent;
}
.code-win code { font: inherit; white-space: pre; }
.code-win .c { color: rgba(254, 254, 254, 0.58); }
.code-win .k { color: var(--pink); }
.code-win .s { color: #9fe3da; }
.code-win .f { color: var(--grey-1); text-decoration: underline; text-decoration-color: rgba(254, 254, 254, 0.3); text-underline-offset: 3px; }
.code-win details summary { cursor: pointer; }

/* table window */
.table-win .os-window__body { padding: 0; }
.table-scroll { overflow-x: auto; scrollbar-width: thin; }
.doc-table { width: 100%; font: 400 16px/1.25 var(--font-body); letter-spacing: 0.03em; color: var(--ink); }
.doc-table th {
  padding: 10px 12px 8px;
  text-align: left;
  vertical-align: bottom;
  font: 500 16px/1 var(--font-pixel);
  letter-spacing: 0.01em;
  white-space: nowrap;
  border-bottom: var(--border) solid var(--ink);
}
.doc-table td { padding: 10px 12px; vertical-align: top; border-top: 1px solid rgba(30, 30, 30, 0.16); }
.doc-table tr:first-child td { border-top: 0; }
.doc-table .num, .doc-table .mono { font: 400 14px/1.3 var(--font-mono); letter-spacing: 0; font-variant-numeric: tabular-nums; white-space: nowrap; }
.doc-table .num { text-align: right; }
.doc-table th.num { text-align: right; }
.doc-table .id { font: 400 14px/1.3 var(--font-mono); letter-spacing: 0; white-space: nowrap; width: 1%; }
.doc-table .wide { min-width: 240px; }
.doc-table .muted { color: rgba(30, 30, 30, 0.7); font-size: 14px; }
.doc-table .stock { display: inline-flex; align-items: center; gap: 8px; font: 500 16px/1 var(--font-display); letter-spacing: 0.02em; white-space: nowrap; }
.doc-table .stock img { width: 22px; height: 22px; border-radius: 50%; }
.doc-table .sub { display: block; margin-top: 6px; font: 400 13px/1.25 var(--font-body); letter-spacing: 0.02em; color: rgba(30, 30, 30, 0.72); }
.show-sm { display: none !important; }
.table-foot { padding: 8px 12px 10px; border-top: var(--border) solid var(--ink); font: 300 12px/1.35 var(--font-mono); letter-spacing: 0.03em; color: var(--ink-86); }

/* pixel chips (severity / status / test kind) */
.chip {
  display: inline-block;
  padding: 1px 5px 3px;
  background: var(--ink);
  color: var(--paper);
  font: 500 15px/1 var(--font-pixel);
  letter-spacing: 0.03em;
  white-space: nowrap;
  vertical-align: 1px;
}
.chip + .chip { margin-left: 4px; }
.chip--ok { background: var(--green); color: var(--ink); }
.chip--pink { background: var(--pink); color: var(--ink); }
.chip--magenta { background: var(--magenta); color: var(--ink); }
.chip--grey { background: var(--grey-2); color: var(--ink); }
.chip--line { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }

/* callout window (pink body) */
.doc-note .os-window__body { font: 400 17px/1.3 var(--font-body); letter-spacing: 0.05em; padding: 12px 14px 14px; }
.doc-note .os-window__body p + p { margin-top: 10px; }
.doc-note .os-window__body strong { font-weight: 700; }

/* two windows side by side */
.doc-grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; align-items: start; }
.doc-grid2 > .os-window { margin-top: 0 !important; }

/* ============================================================== /docs: layout */

body[data-page='docs'] main { padding-bottom: 160px; }
.doc-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 860px);
  justify-content: center;
  gap: 60px;
  max-width: var(--container);
  margin: 70px auto 0;
  padding-inline: var(--page-pad);
  box-sizing: content-box;
}
.doc-body { position: relative; min-width: 0; padding-left: 40px; border-left: var(--border) solid var(--ink); }

/* sidebar: an OS window, sticky */
.doc-toc { position: sticky; top: 16px; align-self: start; z-index: 5; }
.doc-toc__bar-btn { display: none; }
.doc-toc .os-window__body { padding: 6px 4px 8px; }
.doc-toc__list { display: flex; flex-direction: column; gap: 2px; margin: 0; padding: 0; list-style: none; }
.doc-toc__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 3px 6px 5px;
  color: var(--ink);
  font: 500 18px/1.05 var(--font-pixel);
  letter-spacing: 0.01em;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}
.doc-toc__link span { flex: none; min-width: 20px; opacity: 0.7; }
.doc-toc__link:hover { background: var(--magenta); color: var(--paper); }
.doc-toc__link[aria-current='true'] { background: var(--ink); color: var(--pink); }
.doc-toc__link[aria-current='true'] span { opacity: 1; }
.doc-toc__foot { margin-top: 10px; padding: 0 6px; font: 300 12px/1.3 var(--font-mono); letter-spacing: 0.03em; color: var(--ink-86); }
.doc-toc__progress { position: relative; height: 6px; margin: 8px 6px 2px; background: var(--grey-2); box-shadow: inset 0 0 0 1px var(--ink); }
.doc-toc__progress i { position: absolute; left: 0; top: 0; bottom: 0; width: 0; background: var(--ink); }

/* the docs hero band: two windows on the pink dot field */
.doc-band .win-abi { left: 50%; top: 58px; width: 560px; transform: translateX(-58%); }
.doc-band .win-live { right: 7%; top: 128px; width: 260px; }
.doc-band .win-tags { left: 5%; top: 196px; width: 230px; }
.win-tags .os-window__body { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 6px 10px; }
.win-live .kv { padding: 4px 2px 2px; }
.win-live .live-note { display: block; margin-top: 8px; font-size: 11px; }

/* how a cycle works: the flow of five windows */
.doc-flow { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 26px; margin: 0; padding: 0; list-style: none; }
.doc-flow > li { position: relative; display: flex; }
.doc-flow > li > .os-window { flex: 1 1 auto; }
.doc-flow > li + li::before {
  content: '';
  position: absolute;
  left: -22px;
  top: 50%;
  width: 18px;
  height: 14px;
  background: var(--ink);
  transform: translateY(-50%);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 14'%3E%3Cpath d='M0 6h12V2l6 5-6 5V8H0z'/%3E%3C/svg%3E") center/contain no-repeat;
          mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 14'%3E%3Cpath d='M0 6h12V2l6 5-6 5V8H0z'/%3E%3C/svg%3E") center/contain no-repeat;
}
.doc-flow .os-window__body { display: flex; flex-direction: column; gap: 8px; padding: 8px 8px 10px; }
.doc-flow__big { font: 500 22px/1 var(--font-pixel); }
.doc-flow__txt { font: 400 14px/1.25 var(--font-body); letter-spacing: 0.03em; }

/* FAQ inside the long page: an ink panel */
.doc-faq { background: var(--ink); padding: 40px 30px 30px; }
.doc-faq .faq { max-width: none; }

/* glossary */
.doc-gloss { display: grid; grid-template-columns: minmax(150px, 210px) minmax(0, 1fr); margin: 0; border-top: var(--border) solid var(--ink); }
.doc-gloss dt, .doc-gloss dd { padding: 12px 0; border-bottom: 1px solid rgba(30, 30, 30, 0.2); }
.doc-gloss dt { padding-right: 16px; font: 400 14px/1.35 var(--font-mono); letter-spacing: 0; color: var(--ink); }
.doc-gloss dd { margin: 0; }

/* ============================================================== /security */

body[data-page='security'] main { padding-bottom: 160px; }
.sec-wrap { max-width: var(--container); margin: 0 auto; padding-inline: var(--page-pad); box-sizing: content-box; }
.sec-body { max-width: 1072px; margin: 90px auto 0; }
.sec-field { position: relative; padding: 30px; }
.sec-tiles { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 16px; }
.sec-tile .os-window__body { display: flex; flex-direction: column; gap: 10px; padding: 10px 10px 12px; }
.sec-tile__v { font: 400 46px/1 var(--font-mono); letter-spacing: -0.02em; color: var(--ink); font-variant-numeric: tabular-nums; }
.sec-tile__s { font: 400 14px/1.25 var(--font-body); letter-spacing: 0.03em; color: var(--ink-86); }
.sec-summary-note { margin-top: 18px; max-width: 900px; font: 300 13px/1.45 var(--font-mono); letter-spacing: 0.02em; color: var(--ink); }
.sec-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.sec-steps .os-window__body { font: 400 16px/1.3 var(--font-body); letter-spacing: 0.04em; padding: 10px 12px 14px; }
.sec-steps .os-window__body strong { font-weight: 700; }
.sec-risk + .sec-risk { margin-top: 16px; }
.sec-risk .os-window__bar { align-items: center; }
.sec-risk .os-window__body { font: 400 17px/1.3 var(--font-body); letter-spacing: 0.05em; padding: 10px 14px 14px; }
.sec-risk .os-window__body strong { font-weight: 700; }
.sec-cannot { columns: 2; column-gap: 40px; }
.sec-cannot > li { break-inside: avoid; margin-bottom: 10px; }
.sec-report { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px 40px; }
.sec-report .cta-link { flex: none; }

/* ============================================================== /deck */

body[data-page='deck'] { background: var(--ink); color: var(--paper); }
body[data-page='deck'] main { padding: 0 var(--page-pad) 110px; }
.deck-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px 40px;
  max-width: 1072px;
  margin: 70px auto 34px;
}
.deck-head__title { font: 500 var(--fs-h2)/0.9 var(--font-display); letter-spacing: 0; color: var(--paper); text-transform: capitalize; }
.deck-head__title em { font-style: normal; color: var(--pink); }
.deck-head__sub { max-width: 640px; margin-top: 18px; color: rgba(254, 254, 254, 0.86); }
.deck-head__label { margin-bottom: 18px; }
.deck-head__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.deck-head__keys { width: 100%; font: 300 12px/1.4 var(--font-mono); letter-spacing: 0.04em; color: rgba(254, 254, 254, 0.72); }
.kbd { display: inline-block; min-width: 20px; padding: 1px 5px 2px; margin: 0 1px; border: 1px solid rgba(254, 254, 254, 0.5); font: 400 11px/1.2 var(--font-mono); text-align: center; color: var(--paper); }

.deck { display: flex; flex-direction: column; align-items: center; gap: 24px; max-width: 1072px; margin: 0 auto; --s: 0.8375; }
.deck-frame { position: relative; width: calc(1280px * var(--s)); height: calc(720px * var(--s)); overflow: hidden; outline: var(--border) solid rgba(254, 254, 254, 0.28); outline-offset: 0; scroll-margin-top: 16px; }
.deck-frame.is-current { outline-color: var(--pink); }
.deck-frame:focus-visible { outline: 2px solid var(--pink); outline-offset: 3px; }

/* one slide: a 1280 x 720 stage, scaled to the frame */
.slide {
  --fg: var(--ink);
  --fg-2: var(--ink-86);
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  flex-direction: column;
  width: 1280px;
  height: 720px;
  padding: 58px 72px 86px;
  overflow: hidden;
  transform: scale(var(--s));
  transform-origin: 0 0;
  background: var(--paper);
  color: var(--fg);
  font: 400 20px/1.3 var(--font-body);
  letter-spacing: 0.04em;
  isolation: isolate;
}
.slide > * { position: relative; z-index: 1; }
.slide--pink { background: var(--pink); }
.slide--dots { background-color: var(--pink); background-image: url('/img/ts/dot-grid.png'); background-size: 1440px auto; background-position: center; }
.slide--teal { background: var(--teal); }
.slide--teal-grey { background: var(--teal-grey); }
.slide--magenta { background: var(--magenta); --fg-2: var(--ink); }
.slide--ink { background: #151515; --fg: var(--paper); --fg-2: rgba(254, 254, 254, 0.86); }
.slide--paper { background: var(--paper); }

.slide__eyebrow { align-self: flex-start; margin-bottom: 26px; }
.slide__h { max-width: 1020px; font: 500 64px/0.92 var(--font-display); letter-spacing: -0.005em; color: var(--fg); text-transform: capitalize; text-wrap: balance; }
.slide__h--xl { font-size: 118px; line-height: 0.84; letter-spacing: -0.01em; }
.slide__lead { max-width: 820px; margin-top: 26px; font: 400 24px/1.25 var(--font-body); letter-spacing: 0.04em; color: var(--fg-2); text-wrap: pretty; }
.slide__foot { position: absolute; left: 72px; right: 72px; bottom: 34px; display: flex; align-items: center; justify-content: space-between; gap: 20px; z-index: 2; }
.slide__brand { display: inline-flex; align-items: center; gap: 8px; font: 500 18px/1 var(--font-display); letter-spacing: 0.01em; color: var(--fg); }
.slide__brand img { width: auto; height: 15px; }
.slide--ink .slide__brand img { filter: invert(1); }
.slide__num { font: 400 13px/1 var(--font-mono); letter-spacing: 0.04em; color: var(--fg); }
.slide__note { margin-top: auto; padding-top: 18px; font: 300 13px/1.35 var(--font-mono); letter-spacing: 0.02em; color: var(--fg-2); max-width: 1000px; }

.slide__cols { display: grid; gap: 22px; margin-top: 34px; }
.slide__cols--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.slide__cols--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.slide__cols--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.slide .os-window { color: var(--ink); }
.slide .os-window__body { font: 400 18px/1.28 var(--font-body); letter-spacing: 0.03em; padding: 10px 12px 14px; }
.slide .os-window__body strong { font-weight: 700; }
.slide-stat { font: 400 54px/1 var(--font-mono); letter-spacing: -0.03em; color: var(--ink); font-variant-numeric: tabular-nums; }
.slide-stat--sm { font-size: 34px; }
.os-window--dark .slide-stat, .os-window--dark .slide-cap { color: var(--paper); }
.slide-cap { margin-top: 10px; font: 400 16px/1.25 var(--font-body); letter-spacing: 0.03em; color: var(--ink-86); }
.slide .kv dt { font-size: 20px; }
.slide .kv dd { font-size: 18px; }

/* slide art layers */
.slide__art { position: absolute; z-index: 0; pointer-events: none; image-rendering: pixelated; }
.slide__blob { width: 1500px; height: 1500px; max-width: none; mix-blend-mode: multiply; }
.slide__blob--r { right: -620px; bottom: -680px; }
.slide__blob--l { left: -600px; bottom: -710px; }
.slide__blob--tr { width: 1100px; height: 1100px; right: -500px; top: -530px; }
.slide__num--chip { padding: 3px 6px 4px; background: var(--ink); color: var(--paper); }
.slide__planet { right: 70px; top: 70px; width: 330px; height: auto; image-rendering: auto; }
.slide__dither { right: 0; top: 0; bottom: 0; width: 420px; height: 100%; object-fit: cover; }

/* slide 4: the cycle */
.cycle { display: grid; grid-template-columns: 1fr 64px 1fr 64px 1fr; align-items: center; gap: 0; margin-top: 40px; }
.cycle__arrow { display: flex; flex-direction: column; align-items: center; gap: 6px; font: 500 15px/1 var(--font-pixel); color: var(--fg); }
.cycle__arrow svg { width: 44px; height: 16px; }
.cycle .os-window__body { min-height: 120px; }
.cycle-strip { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }

/* slide: versus */
.versus .os-window__body { font: 400 15px/1.5 var(--font-mono) !important; letter-spacing: 0 !important; min-height: 230px; }
.versus .os-window--dark .os-window__body { color: var(--paper); }
.versus li { display: flex; gap: 10px; }
.versus li b { flex: none; min-width: 26px; color: var(--ink); font-weight: 400; }
.versus .os-window--dark li b { color: var(--pink); }
.versus ol { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 6px; }

/* slide: links */
.slide-links { display: flex; flex-wrap: wrap; gap: 8px 44px; margin-top: 40px; }
.slide-links .cta-link { font-size: 64px; }

/* token slide */
.token-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.token-row .btn { height: 48px; padding: 13px 14px; font-size: 22px; line-height: 22px; }

/* the deck dock: fixed controls */
.deck-dock {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 40;
  display: flex;
  align-items: stretch;
  gap: 0;
  background: var(--grey-2);
  box-shadow: 3px 3px 0 var(--pink);
  color: var(--ink);
}
.deck-dock::after { content: ''; position: absolute; inset: 0; border: var(--border) solid var(--ink); pointer-events: none; }
.deck-dock__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 44px;
  height: 44px;
  padding: 0 12px 2px;
  background: var(--grey-1);
  color: var(--ink);
  font: 500 18px/1 var(--font-pixel);
  letter-spacing: 0.01em;
  border-right: var(--border) solid var(--ink);
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}
.deck-dock__btn:last-child { border-right: 0; }
.deck-dock__btn:not(:disabled):hover { background: var(--ink); color: var(--pink); }
.deck-dock__btn:disabled { color: var(--grey-3); cursor: default; }
.deck-dock__btn svg { width: 14px; height: 14px; }
.deck-dock__count { display: inline-flex; align-items: center; justify-content: center; min-width: 88px; height: 44px; padding: 0 10px 2px; background: var(--ink); color: var(--pink); font: 500 18px/1 var(--font-pixel); border-right: var(--border) solid var(--ink); font-variant-numeric: tabular-nums; }

/* present mode: one slide fills the screen */
.deck-present {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0d0d0d;
  touch-action: pan-y;
  --s: 1;
}
.deck-present[hidden] { display: none; }
.deck-present__stage { position: relative; width: calc(1280px * var(--s)); height: calc(720px * var(--s)); margin-bottom: 56px; overflow: hidden; }
.deck-present__bar { position: absolute; left: 0; right: 0; bottom: 0; z-index: 3; display: flex; justify-content: center; padding: 14px; pointer-events: none; }
.deck-present__bar .deck-dock { position: relative; right: auto; bottom: auto; pointer-events: auto; }
.deck-present__hint { position: absolute; top: 12px; left: 50%; z-index: 3; transform: translateX(-50%); font: 300 12px/1.3 var(--font-mono); color: rgba(254, 254, 254, 0.72); white-space: nowrap; }
.deck-present__stage .slide { animation: slide-in 0.28s var(--ease) both; }
.deck-present__stage .slide.from-left { animation-name: slide-in-left; }
@keyframes slide-in { from { opacity: 0.001; transform: translateX(24px) scale(var(--s)); } to { opacity: 1; transform: scale(var(--s)); } }
@keyframes slide-in-left { from { opacity: 0.001; transform: translateX(-24px) scale(var(--s)); } to { opacity: 1; transform: scale(var(--s)); } }
html.is-presenting, html.is-presenting body { overflow: hidden; }

/* ============================================================== breakpoints */

@media (min-width: 1920px) {
  .doc-band { height: 380px; }
}

@media (max-width: 1439px) {
  .doc-band .win-abi { width: 520px; }
}

@media (max-width: 1199px) {
  .doc-band { height: 320px; }
  .doc-band .win-abi { width: 480px; transform: translateX(-50%); top: 40px; }
  .doc-band .win-live { right: 4%; top: 150px; width: 240px; }
  .doc-band .win-tags { left: 3%; top: 190px; width: 210px; }
  .doc-layout { grid-template-columns: 220px minmax(0, 1fr); gap: 36px; }
  .doc-body { padding-left: 28px; }
  .doc-sec + .doc-sec { margin-top: 96px; }
  .doc-flow { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 26px; }
  .doc-flow > li:nth-child(4)::before { display: none; }
  .sec-tiles { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sec-steps { grid-template-columns: 1fr; }
  .deck-head { margin-top: 50px; }
}

@media (max-width: 809px) {
  .doc-top { padding-top: 24px; }
  .doc-band { height: 330px; }
  .doc-band .win-abi { left: 10px; right: 10px; width: auto; top: 16px; transform: none; }
  .doc-band .win-abi pre { font-size: 11px; padding: 8px 10px 10px; }
  .doc-band .win-live { left: 10px; right: auto; top: 168px; width: 220px; }
  .doc-band .win-tags { display: none; }
  .show-sm { display: block !important; }
  .hide-sm { display: none !important; }
  .doc-table .mono { white-space: normal; overflow-wrap: anywhere; }
  .doc-band__blob { width: 1000px; height: 1000px; }
  .doc-band__blob--a { left: -560px; bottom: -560px; }
  .doc-band__blob--b { display: none; }
  .doc-band__blob--c { left: calc(100% - 480px); bottom: -600px; }
  .doc-head { margin-top: 36px; padding: 16px 12px 22px; }
  .doc-title { margin-top: 22px; }
  .doc-sub { margin-top: 24px; font-size: 19px; }

  .doc-layout { display: block; margin-top: 36px; padding-inline: var(--page-pad); }
  .doc-body { padding-left: 0; border-left: 0; margin-top: 30px; }
  .doc-sec { scroll-margin-top: 64px; }
  .doc-sec + .doc-sec { margin-top: 80px; }
  .doc-sec__head { margin-bottom: 22px; }

  /* the sidebar collapses into a sticky bar with a drop-down list */
  .doc-toc { top: 0; margin-inline: calc(-1 * var(--page-pad)); padding: 8px var(--page-pad); background: var(--teal-grey); }
  .doc-toc .os-window__bar { display: none; }
  .doc-toc .os-window__frame { padding: 0; background: transparent; }
  .doc-toc .os-window__frame::after { display: none; }
  .doc-toc .os-window__body { padding: 0; background: transparent; }
  .doc-toc .os-window__body::after { display: none; }
  .doc-toc__bar-btn {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    min-height: 42px;
    padding: 6px 10px 8px;
    background: var(--ink);
    color: var(--paper);
    font: 500 18px/1.1 var(--font-pixel);
    letter-spacing: 0.01em;
    text-align: left;
  }
  .doc-toc__bar-btn b { font-weight: 500; color: var(--pink); }
  .doc-toc__bar-btn span { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .doc-toc__bar-btn svg { width: 14px; height: 14px; flex: none; transition: transform 0.2s var(--ease); }
  .doc-toc.is-open .doc-toc__bar-btn svg { transform: rotate(180deg); }
  .doc-toc__panel { display: none; margin-top: 6px; padding: 6px 4px 8px; background: var(--grey-1); box-shadow: inset 0 0 0 var(--border) var(--ink), 3px 3px 0 var(--ink); max-height: calc(100vh - 90px); overflow-y: auto; }
  .doc-toc.is-open .doc-toc__panel { display: block; }
  .doc-toc__link { font-size: 19px; padding: 7px 8px 9px; }

  .prose { font-size: 17px; }
  .doc-flow { grid-template-columns: 1fr; gap: 24px; }
  .doc-flow > li + li::before { display: block !important; left: 50%; top: -20px; width: 14px; height: 16px; transform: translateX(-50%) rotate(90deg); }
  .doc-faq { padding: 30px 14px 20px; margin-inline: calc(-1 * var(--page-pad)); }
  .doc-faq .faq__a { font-size: 19px; line-height: 1.22; padding-top: 28px; }
  .doc-gloss { grid-template-columns: 1fr; }
  .doc-gloss dt { padding-bottom: 2px; border-bottom: 0; }
  .doc-gloss dd { padding-top: 2px; }
  .doc-grid2 { grid-template-columns: 1fr; }
  .code-win pre { font-size: 12px; padding: 12px 12px 14px; }
  .doc-table { font-size: 15px; }
  .doc-table th, .doc-table td { padding-inline: 10px; }

  .sec-body { margin-top: 56px; }
  .sec-field { padding: 14px 10px; }
  .sec-tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .sec-tile__v { font-size: 36px; }
  .sec-cannot { columns: 1; }

  .deck-head { margin: 40px auto 24px; }
  .deck-head__keys { display: none; }
  .deck { gap: 16px; }
  .deck-dock { right: 10px; bottom: 10px; }
  .deck-dock__btn { min-width: 44px; padding-inline: 10px; }
  .deck-dock__count { min-width: 72px; }
}

/* ---------------------------------------------------------- deck under 810 px: slides reflow into cards */
@media (max-width: 809px) {
  .deck-frame { width: 100%; height: auto; }
  .deck-frame .slide, .deck-present__stage .slide {
    position: relative;
    width: 100%;
    height: auto;
    min-height: 0;
    padding: 28px 18px 64px;
    transform: none;
    font-size: 17px;
  }
  .slide__eyebrow { margin-bottom: 18px; }
  .slide__h { font-size: 34px; line-height: 0.95; }
  .slide__h--xl { font-size: 50px; line-height: 0.88; }
  .slide__lead { font-size: 18px; margin-top: 16px; }
  .slide__foot { left: 18px; right: 18px; bottom: 20px; }
  .slide__cols, .slide__cols--2, .slide__cols--3, .slide__cols--4 { grid-template-columns: 1fr; gap: 14px; margin-top: 22px; }
  .slide__cols--4.slide__cols--keep2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .slide-stat { font-size: 38px; }
  .slide-stat--sm { font-size: 28px; }
  .slide .os-window__body { font-size: 16px; }
  .slide__note { margin-top: 18px; padding-top: 0; font-size: 12px; }
  .slide__blob { width: 900px; height: 900px; }
  .slide__blob--r { right: -420px; bottom: -520px; }
  .slide__blob--l { left: -420px; bottom: -520px; }
  .slide__blob--tr { width: 700px; height: 700px; right: -330px; top: -330px; }
  .slide__planet { position: relative; right: auto; top: auto; width: 150px; margin: 22px 0 0; order: 5; }
  .slide__dither { display: none; }
  .cycle { grid-template-columns: 1fr; gap: 8px; margin-top: 22px; }
  .cycle__arrow { flex-direction: row; justify-content: center; }
  .cycle__arrow svg { transform: rotate(90deg); width: 30px; }
  .cycle .os-window__body { min-height: 0; }
  .versus .os-window__body { min-height: 0; font-size: 13px !important; }
  .slide-links { gap: 4px 24px; margin-top: 24px; }
  .slide-links .cta-link { font-size: 28px; }
  .token-row .btn { height: 40px; padding: 9px 10px; font-size: 18px; line-height: 18px; }
  .deck-present { align-items: flex-start; overflow-y: auto; }
  .deck-present__stage { width: 100%; height: auto; min-height: 100%; margin-bottom: 0; overflow: visible; padding-bottom: 80px; }
  .deck-present__bar { position: fixed; }
  .deck-present__hint { display: none; }
  .deck-present__stage .slide { animation-name: slide-in-m; }
  .deck-present__stage .slide.from-left { animation-name: slide-in-m-left; }
  @keyframes slide-in-m { from { opacity: 0.001; transform: translateX(24px); } to { opacity: 1; transform: none; } }
  @keyframes slide-in-m-left { from { opacity: 0.001; transform: translateX(-24px); } to { opacity: 1; transform: none; } }
}

@media (max-width: 379px) {
  .sec-tiles { grid-template-columns: 1fr; }
  .slide__h { font-size: 30px; }
  .slide__h--xl { font-size: 44px; }
  .deck-dock__count { min-width: 64px; }
}

@media (prefers-reduced-motion: reduce) {
  .live.is-loading { animation: none; }
}

/* details-based code window (full ABI): the bar is the summary */
.code-win > summary { list-style: none; cursor: pointer; }
.code-win > summary::-webkit-details-marker { display: none; }
.code-win > summary::marker { content: ''; }
.code-win[open] > summary .os-window__meta { opacity: 1; }
details.code-win { margin-top: 16px !important; }

/* deck: extra slide parts */
.slide--split { padding-right: 500px; }
.slide--split .slide__num { padding: 3px 6px 4px; background: var(--ink); color: var(--paper); }
.slide__cols--3r { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.deck-best { margin-top: 22px; }
.deck-best .os-window__body { padding: 10px 12px 12px; font: 400 16px/1.35 var(--font-mono) !important; letter-spacing: 0 !important; color: var(--paper); }
.slide--ink .slide__h, .slide--ink .slide__lead, .slide--ink .slide__note, .slide--ink .slide__num { color: var(--fg); }
.slide--ink .slide__lead, .slide--ink .slide__note { color: var(--fg-2); }
.deck-list { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 9px; }
.deck-list li { position: relative; padding-left: 20px; }
.deck-list li::before { content: ''; position: absolute; left: 2px; top: 0.45em; width: 7px; height: 7px; background: var(--ink); }
.deck-frame { touch-action: pan-y; }
@media (max-width: 809px) {
  .slide--split { padding-right: 18px; }
  .slide--split .slide__num { padding: 0; background: none; color: var(--fg); }
  .slide__cols--3r { grid-template-columns: 1fr; }
  .deck-best .os-window__body { font-size: 14px !important; }
}