/* The primer (#primer): hands-on stations for readers new to quantum computing, plus the additions it makes to
 * every chapter's "Before you begin" box. Colors come only from ../brand/tokens.css. Same journal typesetting as
 * the chapters: serif for language, sans only for controls and figures, mono only for bitstrings. */

.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
#primer-view { position: relative; }
.pk-missing { padding: 60px 0; font-family: var(--font-serif); font-size: 19px; color: var(--ink-2); text-align: center; }

/* Opener: the chapter opener's shape, with a strip of stations under it */
.pk-head { display: grid; }
.pk-strip { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 2px; margin: 16px auto 0; max-width: 46em; font-family: var(--font-serif); font-size: 16.5px; }
.pk-strip a { min-width: 30px; padding: 2px 6px; text-align: center; color: var(--ink-2); text-decoration: none; border-bottom: 1px solid transparent; font-variant-numeric: oldstyle-nums; }
.pk-strip a:hover { color: var(--ink); border-bottom-color: var(--ink-3); }
.pk-strip a[aria-current="page"] { color: var(--thread); border-bottom-color: var(--thread); }
.pk-strip a.is-done { color: var(--ink); }
.pk-strip .pk-tick { margin-left: 2px; font-size: 12px; color: var(--thread); }
.pk-strip-sep { color: var(--ink-3); padding: 2px 6px; }

/* Shared page pieces */
.pk-page { max-width: 1080px; margin: 0 auto; padding-top: 28px; }
.pk-k { display: block; margin: 0 0 10px; font-family: var(--font-serif); font-weight: 400; font-size: 15.5px; text-transform: lowercase; font-variant: small-caps; letter-spacing: 0.1em; color: var(--ink-3); }
.pk-lede { max-width: 44em; margin: 0 0 28px; font-family: var(--font-serif); font-size: 20px; line-height: 1.55; color: var(--ink); }
.pk-small { margin: 8px 0 0; font-family: var(--font-serif); font-size: 15px; line-height: 1.45; color: var(--ink-3); }
.pk-small a, .pk-lede a, .pk-end a, .pk-where a, .pk-refs a, .pk-revisit a { color: var(--ink); text-decoration-color: var(--hairline); text-underline-offset: 3px; }
.pk-small a:hover, .pk-end a:hover, .pk-where a:hover, .pk-refs a:hover, .pk-revisit a:hover { color: var(--thread); text-decoration-color: var(--thread); }
.pk-link { padding: 0; border: 0; background: none; font: inherit; color: var(--ink-2); text-decoration: underline; text-decoration-color: var(--hairline); text-underline-offset: 3px; cursor: pointer; }
.pk-link:hover { color: var(--ink); }
.pk-read { margin: 12px 0 0; font-family: var(--font-serif); font-size: 17px; line-height: 1.5; color: var(--ink-2); }
.pk-read b, .pk-big b { color: var(--ink); font-weight: 500; font-variant-numeric: lining-nums; }
.pk-big { margin: 12px 0 0; min-height: 1.5em; font-family: var(--font-serif); font-size: 19px; line-height: 1.45; color: var(--ink); }
.pk-live { margin: 10px 0 0; min-height: 1.4em; font-family: var(--font-serif); font-size: 17px; line-height: 1.45; color: var(--ink); }
.pk-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.pk-row .chip { font-size: 13.5px; padding: 7px 12px; }

/* Overview */
.pk-cols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 16px 56px; padding-top: 18px; border-top: 1px solid var(--ink); }
.pk-how ul { margin: 0; padding-left: 20px; }
.pk-how li { margin-bottom: 8px; font-family: var(--font-serif); font-size: 17px; line-height: 1.5; color: var(--ink-2); }
.pk-pitch p { margin: 0 0 12px; font-family: var(--font-serif); font-size: 18px; line-height: 1.6; color: var(--ink); }
.pk-pitch p:first-of-type::first-letter { float: left; font-size: 3.4em; line-height: 0.8; padding: 6px 8px 0 0; color: var(--thread); }
.pk-map { margin-top: 36px; padding-top: 18px; border-top: 1px solid var(--ink); }
.pk-map-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.pk-progress { margin: 0; font-family: var(--font-serif); font-style: italic; font-size: 16px; color: var(--ink-2); }
.pk-map ol { list-style: none; margin: 0; padding: 0; }
.pk-stop { display: grid; grid-template-columns: 2.2em minmax(0, 1fr) auto; gap: 4px 14px; align-items: baseline; padding: 14px 0; border-top: 1px solid var(--hairline); color: inherit; text-decoration: none; }
.pk-map li:last-child .pk-stop { border-bottom: 1px solid var(--hairline); }
.pk-n { font-family: var(--font-serif); font-size: 22px; color: var(--thread); font-variant-numeric: oldstyle-nums; }
.pk-stop-main { display: grid; gap: 2px; }
.pk-stop-t { font-family: var(--font-serif); font-size: 21px; color: var(--ink); }
.pk-stop-i { font-family: var(--font-serif); font-size: 16px; line-height: 1.45; color: var(--ink-3); }
.pk-stop-m { font-family: var(--font-serif); font-style: italic; font-size: 15.5px; color: var(--ink-3); white-space: nowrap; }
.pk-stop:hover .pk-stop-t { text-decoration: underline; text-decoration-color: var(--thread); text-underline-offset: 4px; }
.pk-stop.is-done .pk-stop-t { color: var(--ink-2); }
.pk-done-mark { color: var(--thread); font-style: normal; }
.pk-refs { margin-top: 36px; padding-top: 18px; border-top: 1px solid var(--ink); }
.pk-refs ul { list-style: none; margin: 0; padding: 0; }
.pk-refs li { display: grid; gap: 2px; padding: 10px 0; border-bottom: 1px solid var(--hairline); }
.pk-refs li a { font-family: var(--font-serif); font-size: 20px; font-style: italic; }
.pk-refs li span { font-family: var(--font-serif); font-size: 16px; color: var(--ink-3); }

/* A station: do first, read second */
.pk-do { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.6fr); gap: 20px 40px; padding-top: 18px; border-top: 1px solid var(--ink); }
.pk-steps ol { margin: 0; padding-left: 22px; }
.pk-steps li { margin-bottom: 12px; padding-left: 4px; font-family: var(--font-serif); font-size: 18px; line-height: 1.5; color: var(--ink); }
.pk-steps li::marker { color: var(--thread); font-variant-numeric: oldstyle-nums; }
.pk-act { min-width: 0; }
.pk-box { padding: 14px 0 18px; border-top: 1px solid var(--hairline); }
.pk-box:first-child { border-top: 0; padding-top: 0; }
.pk-slide { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: center; margin-top: 10px; font-family: var(--font-serif); font-size: 16.5px; color: var(--ink-2); }
.pk-slide input { flex: 1 1 180px; min-width: 140px; accent-color: var(--thread); }
.pk-slide output { flex: 0 0 4.5em; font-family: var(--font-sans); font-size: 13.5px; color: var(--ink); font-variant-numeric: tabular-nums; text-align: right; }

.pk-notice { margin-top: 26px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--hairline); }
.pk-notice > summary { list-style: none; cursor: pointer; display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; padding: 14px 0; }
.pk-notice > summary::-webkit-details-marker { display: none; }
.pk-notice > summary .pk-k { margin: 0; color: var(--thread); font-size: 17px; }
.pk-sub { font-family: var(--font-serif); font-style: italic; font-size: 16px; color: var(--ink-3); }
.pk-notice[open] .pr-toggle::after { content: "hide"; }
.pk-notice ul { margin: 0 0 16px; padding-left: 22px; }
.pk-notice li { margin-bottom: 8px; font-family: var(--font-serif); font-size: 17.5px; line-height: 1.5; color: var(--ink); }

.pk-words { margin-top: 28px; }
.pk-words > .pk-k { margin-bottom: 4px; }
.pk-more { margin-top: 4px; }
.pk-more > summary { cursor: pointer; padding: 10px 0; font-family: var(--font-serif); font-style: italic; font-size: 16.5px; color: var(--ink-2); border-top: 1px solid var(--hairline); }
.pk-more > summary:hover { color: var(--ink); }
.pk-revisit { margin: 14px 0 0; font-family: var(--font-serif); font-size: 16.5px; color: var(--ink-2); }
.pk-revisit .pk-k { display: inline; margin-right: 10px; }
.pk-myth { max-width: 60em; margin-top: 26px; }

.pk-two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px 48px; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--ink); }
.pk-say blockquote, .pr-say blockquote { margin: 0; padding-left: 16px; border-left: 2px solid var(--thread); font-family: var(--font-serif); font-style: italic; font-size: 20px; line-height: 1.5; color: var(--ink); }
.pk-ai p { margin: 0; font-family: var(--font-serif); font-size: 17px; line-height: 1.55; color: var(--ink-2); }

.pk-check { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--ink); }
.pk-q { margin: 0 0 12px; max-width: 44em; font-family: var(--font-serif); font-size: 19px; line-height: 1.45; color: var(--ink); }
.pk-opts { display: flex; flex-wrap: wrap; gap: 8px; }
.pk-opt { padding: 8px 14px; border: 1px solid var(--hairline); background: transparent; cursor: pointer; text-align: left; font-family: var(--font-serif); font-size: 16.5px; line-height: 1.35; color: var(--ink-2); }
.pk-opt:hover { color: var(--ink); border-color: var(--ink-3); }
.pk-opt[aria-pressed="true"] { color: var(--ink); border-color: var(--ink); }
.pk-opt.is-right[aria-pressed="true"] { border-color: var(--thread); box-shadow: inset 0 0 0 1px var(--thread); }
.pk-opt.is-wrong[aria-pressed="true"] { border-color: var(--contested); }
.pk-fb { max-width: 46em; }
.pk-fb.ok b { color: var(--thread); font-weight: 500; }
.pk-fb.no b { color: var(--contested); font-weight: 500; }

.pk-where { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--ink); }
.pk-where ul { margin: 0; padding-left: 20px; }
.pk-where li { margin-bottom: 4px; font-family: var(--font-serif); font-size: 17.5px; }
.pk-end { display: flex; align-items: center; gap: 12px 24px; flex-wrap: wrap; margin-top: 28px; padding: 18px 0 8px; border-top: 3px double var(--ink); }
.pk-end p { margin: 0; font-family: var(--font-serif); font-style: italic; font-size: 17.5px; color: var(--ink-2); }
.pk-done-btn { padding: 10px 20px; border: 1px solid var(--thread); background: transparent; color: var(--thread); cursor: pointer; font-family: var(--font-serif); font-size: 18px; }
.pk-done-btn:hover { background: var(--thread-glow); }
.pk-done-btn[aria-pressed="true"] { background: var(--thread); color: var(--void); }
.pk-foot { display: grid; }

/* Activities: odds bars, charts, the dial, the circuit */
.pk-odds { margin-top: 12px; }
.pk-odds .pk-k { margin-bottom: 6px; }
.pk-orow { display: grid; grid-template-columns: 1.4em minmax(0, 1fr) 3.6em; gap: 10px; align-items: center; margin: 4px 0; font-family: var(--font-mono); font-size: 13px; }
.pk-orow b { font-family: var(--font-sans); font-weight: 500; text-align: right; font-variant-numeric: tabular-nums; }
.pk-bar { display: block; height: 12px; background: var(--substrate); border: 1px solid var(--hairline); }
.pk-bar > span { display: block; height: 100%; background: var(--ink-3); transition: width .25s var(--ease); }
.pk-bar.is-one > span { background: var(--thread); }

.pk-plot { display: block; width: 100%; max-width: 560px; height: auto; margin-top: 10px; overflow: visible; }
.pk-plot .pk-ax { stroke: var(--ink-3); stroke-width: 1; }
.pk-plot .pk-grid { stroke: var(--hairline); stroke-width: 1; }
.pk-plot .pk-line { fill: none; stroke: var(--ink-2); stroke-width: 2; }
.pk-plot .pk-line.is-thread { stroke: var(--thread); stroke-width: 2.5; }
.pk-plot .pk-line.is-muted { stroke: var(--ink-3); stroke-dasharray: 5 4; }
.pk-plot .pk-ref { stroke: var(--ink-3); stroke-dasharray: 2 4; }
.pk-plot .pk-mark { fill: var(--thread); stroke: var(--void); stroke-width: 2; }
.pk-plot .pk-mark.is-muted { fill: var(--ink-3); }
.pk-plot text, .pk-line01 text, .pk-land text { font-family: var(--font-sans); font-size: 11.5px; fill: var(--ink-3); }
.pk-plot .pk-axlab { font-size: 12px; fill: var(--ink-2); }
.pk-plot .pk-slab { font-size: 12px; fill: var(--ink-2); }
.pk-plot .pk-slab.is-thread { fill: var(--thread); }
.pk-plot .pk-reflab { font-style: italic; }

.pk-switches { display: flex; flex-wrap: wrap; gap: 8px; }
.pk-switch { width: 48px; height: 64px; display: grid; place-items: center; border: 1px solid var(--ink-3); background: var(--substrate); cursor: pointer; font-family: var(--font-mono); font-size: 20px; color: var(--ink-2); }
.pk-switch span { display: block; }
.pk-switch[aria-pressed="true"] { background: var(--thread); border-color: var(--thread); color: var(--void); }
.pk-bits { margin: 12px 0 0; font-family: var(--font-serif); font-size: 17px; color: var(--ink-2); }
.pk-bits code { margin-left: 8px; font-size: 18px; color: var(--thread); letter-spacing: 0.08em; }
.pk-grid { display: grid; grid-template-columns: repeat(var(--cols, 4), 12px); gap: 3px; margin-top: 12px; }
.pk-grid span { width: 12px; height: 12px; border: 1px solid var(--hairline); background: var(--substrate); }
.pk-grid span.on { background: var(--thread); border-color: var(--thread); }

.pk-guests { display: block; width: 100%; max-width: 380px; height: auto; }
.pk-guest { cursor: pointer; }
.pk-guest circle { fill: var(--substrate); stroke: var(--ink-3); stroke-width: 1.5; }
.pk-guest:hover circle, .pk-guest:focus-visible circle { stroke: var(--hypha); }
.pk-guest:focus { outline: none; }
.pk-guest:focus-visible circle { stroke-width: 3; }
.pk-guest[aria-pressed="true"] circle { fill: var(--thread); stroke: var(--thread); }
.pk-guest text { font-family: var(--font-serif); pointer-events: none; }
.pk-guest .pk-gname { font-size: 16px; fill: var(--ink); }
.pk-guest .pk-gval { font-size: 11px; fill: var(--ink-3); font-family: var(--font-sans); }
.pk-guest[aria-pressed="true"] text { fill: var(--void); }
.pk-feud line { stroke: var(--hairline); stroke-width: 2; }
.pk-feud text { font-family: var(--font-sans); font-size: 11.5px; fill: var(--ink-3); }
.pk-feud.is-paid line { stroke: var(--tension); stroke-width: 3; }
.pk-feud.is-paid text { fill: var(--tension); }
.pk-land { display: block; width: 100%; max-width: 560px; height: auto; }
.pk-lbar { fill: var(--yields); }
.pk-lbar.is-low { fill: var(--ink-3); }
.pk-lbar.is-you { fill: var(--thread); }
.pk-land .pk-you { fill: var(--thread); font-style: italic; }

.pk-dialbox { display: grid; grid-template-columns: minmax(180px, 260px) minmax(0, 1fr); gap: 16px 28px; align-items: start; }
.pk-dialwrap { touch-action: none; cursor: grab; }
.pk-dial { display: block; width: 100%; height: auto; }
.pk-dial-ring { fill: var(--substrate); stroke: var(--hairline); stroke-width: 1.5; }
.pk-dial-axis { stroke: var(--ink-3); stroke-width: 1; stroke-dasharray: 3 4; }
.pk-dial-lab { font-family: var(--font-mono); font-size: 15px; fill: var(--ink-2); }
.pk-dial-shadow { stroke: var(--ink-3); stroke-width: 6; opacity: 0.55; }
.pk-dial-shadow.is-one { stroke: var(--thread); opacity: 0.4; }
.pk-dial-arrow { stroke: var(--thread); stroke-width: 3; stroke-linecap: round; }
.pk-dial-tip { fill: var(--thread); }
.pk-dial.is-small .pk-dial-arrow { stroke-width: 2.5; }
.pk-dial.is-small .pk-dial-axis { stroke-dasharray: none; stroke: var(--hairline); }

.pk-circuit { display: flex; flex-wrap: wrap; align-items: center; gap: 0; margin-top: 14px; font-family: var(--font-mono); font-size: 14px; }
.pk-wire { padding: 0 10px; color: var(--ink-3); font-family: var(--font-serif); font-style: italic; font-size: 15px; }
.pk-gate { position: relative; display: grid; place-items: center; width: 34px; height: 34px; margin: 0 8px; border: 1.5px solid var(--ink); color: var(--ink); background: var(--substrate); }
.pk-gate::before { content: ""; position: absolute; right: 100%; width: 8px; top: 50%; border-top: 1px solid var(--ink-3); }
.pk-steps-strip { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.pk-steps-strip figure { margin: 0; width: 64px; text-align: center; }
.pk-steps-strip figcaption { font-family: var(--font-mono); font-size: 12px; color: var(--ink); line-height: 1.3; }
.pk-steps-strip figcaption span { color: var(--ink-3); font-size: 11px; }
.pk-compare { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px 28px; margin-top: 14px; }
.pk-chal { list-style: none; margin: 0; padding: 0; }
.pk-chal li { display: grid; grid-template-columns: 26px minmax(0, 1fr); gap: 8px; align-items: baseline; padding: 6px 0; font-family: var(--font-serif); font-size: 17px; color: var(--ink-2); border-bottom: 1px solid var(--hairline); }
.pk-chal li.is-done { color: var(--ink); }
.pk-cbox { display: inline-grid; place-items: center; width: 18px; height: 18px; border: 1px solid var(--ink-3); font-size: 13px; color: var(--thread); }
.pk-chal li.is-done .pk-cbox { border-color: var(--thread); }

.pk-amps { margin-top: 12px; }
.pk-arow { display: grid; grid-template-columns: 2.4em minmax(0, 1fr) 3.6em 3.6em; gap: 10px; align-items: center; margin: 4px 0; }
.pk-arow code { color: var(--ink); }
.pk-arow b { font-family: var(--font-sans); font-weight: 500; font-size: 13px; text-align: right; font-variant-numeric: tabular-nums; }
.pk-arow .pk-small { margin: 0; text-align: right; font-family: var(--font-sans); font-size: 12.5px; }
.pk-amp { position: relative; display: block; height: 12px; background: var(--substrate); border: 1px solid var(--hairline); }
.pk-amp::after { content: ""; position: absolute; left: 50%; top: -3px; bottom: -3px; border-left: 1px solid var(--ink-3); }
.pk-amp > span { position: absolute; top: 0; bottom: 0; left: 50%; background: var(--thread); }
.pk-amp > span.is-neg { left: auto; right: 50%; background: var(--hypha); }
.pk-check-row { display: flex; gap: 10px; align-items: baseline; margin-top: 10px; font-family: var(--font-serif); font-size: 17px; color: var(--ink); cursor: pointer; }
.pk-check-row input { accent-color: var(--thread); width: 16px; height: 16px; }
.pk-tally { margin-top: 12px; border-collapse: collapse; font-family: var(--font-sans); font-size: 13.5px; font-variant-numeric: tabular-nums; }
.pk-tally caption { text-align: left; padding-bottom: 6px; font-family: var(--font-serif); font-size: 15.5px; color: var(--ink-3); }
.pk-tally th, .pk-tally td { padding: 5px 14px 5px 0; border-bottom: 1px solid var(--hairline); text-align: left; font-weight: 400; }
.pk-tally thead th { border-bottom: 1px solid var(--ink-3); color: var(--ink-3); }

.pk-line01 { display: block; width: 100%; max-width: 560px; height: auto; margin-top: 12px; overflow: visible; }
.pk-line01 .pk-ax { stroke: var(--ink-3); }
.pk-band { fill: var(--hypha-dim); stroke: var(--hypha); }
.pk-est { stroke: var(--ink); stroke-width: 2; }
.pk-guess { fill: var(--hypha); }
.pk-true { stroke: var(--thread); stroke-width: 3; }
.pk-line01 .pk-truelab { fill: var(--thread); }

.pk-qaoa { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr); gap: 16px 32px; }
.pk-qbars { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 6px; align-items: end; height: 150px; margin-top: 16px; }
.pk-qbar { position: relative; display: flex; flex-direction: column; justify-content: flex-end; height: 100%; }
.pk-qfill { display: block; width: 100%; background: var(--ink-3); transition: height .2s var(--ease); min-height: 1px; }
.pk-qbar.is-best .pk-qfill { background: var(--thread); }
.pk-qbar code { margin-top: 4px; text-align: center; font-size: 11.5px; color: var(--ink-2); }
.pk-qbar.is-best code { color: var(--thread); }
.pk-heatwrap { width: 100%; max-width: 300px; border: 1px solid var(--ink-3); }
.pk-heatwrap canvas { display: block; width: 100%; height: auto; aspect-ratio: 1; cursor: crosshair; }
.pk-heataxes { display: flex; justify-content: space-between; max-width: 300px; }

.pk-atoms { display: block; width: 100%; max-width: 420px; height: auto; }
.pk-zone { fill: var(--hypha-dim); stroke: var(--hypha); stroke-dasharray: 4 4; }
.pk-clash { stroke: var(--ink-3); stroke-width: 1.5; }
.pk-atom { cursor: pointer; }
.pk-atom:focus { outline: none; }
.pk-atom circle { fill: var(--substrate); stroke: var(--ink-2); stroke-width: 1.5; }
.pk-atom text { font-family: var(--font-sans); font-size: 12px; fill: var(--ink); pointer-events: none; }
.pk-atom:hover circle, .pk-atom:focus-visible circle { stroke: var(--hypha); stroke-width: 3; }
.pk-atom.is-on circle { fill: var(--thread); stroke: var(--thread); }
.pk-atom.is-on text { fill: var(--void); }
.pk-atom.is-blocked circle { stroke-dasharray: 3 3; opacity: 0.6; }
.pk-atom.is-blocked text { fill: var(--ink-3); }

.pk-cards { list-style: none; margin: 0; padding: 0; counter-reset: card; }
.pk-cards li { padding: 14px 0; border-bottom: 1px solid var(--hairline); counter-increment: card; }
.pk-cards li > p { margin: 0 0 10px; font-family: var(--font-serif); font-size: 18.5px; line-height: 1.45; color: var(--ink); }
.pk-cards li > p::before { content: counter(card) ".  "; color: var(--thread); font-variant-numeric: oldstyle-nums; }

/* Reference pages */
.pk-phrases { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.pk-phrases li { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.4fr); gap: 8px 40px; padding: 16px 0; border-bottom: 1px solid var(--hairline); }
.pk-hear { margin: 0; font-family: var(--font-serif); font-style: italic; font-size: 21px; line-height: 1.35; color: var(--thread); }
.pk-phrases dl { margin: 0; }
.pk-phrases dl > div { display: grid; grid-template-columns: 7.5em minmax(0, 1fr); gap: 12px; padding: 2px 0 6px; }
.pk-phrases dt { font-family: var(--font-serif); font-variant: small-caps; text-transform: lowercase; letter-spacing: 0.08em; font-size: 15px; color: var(--ink-3); padding-top: 2px; }
.pk-phrases dd { margin: 0; font-family: var(--font-serif); font-size: 17px; line-height: 1.5; color: var(--ink-2); }
.pk-phrases dl > div + div dd { color: var(--ink); }
.pk-key { display: flex; gap: 20px; margin: 0 0 12px; }
.pk-fit { white-space: nowrap; font-family: var(--font-serif); color: var(--ink); }
.pk-fit > span { color: var(--ink-2); }
.pk-dict { width: 100%; border-collapse: collapse; border-top: 2px solid var(--ink); border-bottom: 2px solid var(--ink); }
.pk-dict th, .pk-dict td { padding: 10px 16px 10px 0; vertical-align: top; text-align: left; border-bottom: 1px solid var(--hairline); font-family: var(--font-serif); font-size: 16.5px; line-height: 1.45; font-weight: 400; color: var(--ink-2); }
.pk-dict thead th { border-bottom: 1px solid var(--ink); font-variant: small-caps; text-transform: lowercase; letter-spacing: 0.08em; font-size: 15px; color: var(--ink-3); }
.pk-dict tbody th { color: var(--ink); }
.pk-dict td:nth-child(2) { color: var(--thread); font-style: italic; }
.pk-chs a { margin-left: 4px; color: var(--ink-3); font-variant-numeric: oldstyle-nums; text-decoration: none; border-bottom: 1px solid var(--hairline); }
.pk-chs a:hover { color: var(--thread); border-color: var(--thread); }
.pk-myths { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); counter-reset: myth; }
.pk-myths li { padding: 16px 0; border-bottom: 1px solid var(--hairline); counter-increment: myth; }
.pk-claim { margin: 0 0 10px; font-family: var(--font-serif); font-size: 20px; line-height: 1.4; color: var(--ink); }
.pk-claim::before { content: counter(myth) ".  "; color: var(--thread); font-variant-numeric: oldstyle-nums; }

/* What the primer adds to each chapter's "Before you begin" */
.pr-ai { color: var(--ink-2) !important; }
.pr-warm { margin: 12px 0 8px; padding: 10px 0 12px 16px; border-left: 2px solid var(--thread); }
.pr-warm .pr-h { margin-top: 0; color: var(--thread); }
.pr-warm ul { list-style: none; margin: 0; padding: 0; }
.pr-warm li { margin-bottom: 4px; font-family: var(--font-serif); font-size: 16.5px; line-height: 1.45; }
.pr-warm a { color: var(--ink); text-decoration-color: var(--hairline); text-underline-offset: 3px; }
.pr-warm a:hover { color: var(--thread); text-decoration-color: var(--thread); }
.pr-warm li span { color: var(--ink-3); font-style: italic; }
.pr-tail { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 8px 48px; margin-top: 12px; border-top: 1px solid var(--ink); }
.pr-tail .pr-say { padding-top: 6px; }
.pr-tail .pk-check { margin-top: 0; padding-top: 18px; border-top: 0; }

@container page (max-width: 740px) {
  .pk-cols, .pk-do, .pk-two, .pk-compare, .pk-qaoa, .pr-tail, .pk-phrases li { grid-template-columns: minmax(0, 1fr); }
  .pk-dialbox { grid-template-columns: minmax(0, 1fr); }
  .pk-dialwrap { max-width: 260px; }
  .pk-stop { grid-template-columns: 1.8em minmax(0, 1fr); }
  .pk-stop-m { grid-column: 2; }
  .pk-phrases dl > div { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .pk-lede { font-size: 18.5px; }
}
@media (prefers-reduced-motion: reduce) {
  .pk-bar > span, .pk-qfill { transition: none; }
}

/* The cover's second way in */
.begin-primer { margin: 18px auto 0; max-width: 34em; font-family: var(--font-serif); font-size: 17.5px; line-height: 1.5; color: var(--ink-2); text-align: center; }
.begin-primer a { color: var(--thread); text-decoration-color: color-mix(in srgb, var(--thread) 45%, transparent); text-underline-offset: 3px; }