/* Shared design layer for the multi-page InferenceNet Challenge site.
 * Load after styles.css. Extends the existing
 * system: white paper, 1px --line rules, no shadows, Inter, one navy accent.
 * Sections: 1 tokens · 2 shared primitives · 3 header/nav · 4 page hero + subnav ·
 * 5 stats/cards/kv/tables · 6 charts · 7 steps/code/callouts ·
 * 8 badges/tabs/diagram/footer nav · 9 responsive · 10 print/forced colors. */

/* 1 · Tokens ---------------------------------------------------------------- */
:root{
  --header-h:78px;
  --radius:4px;
  --brand:#264873;
  --brand-tint:#edf2fb;
  --caution:#8a5a00;
  /* Chart palette: one blue family (hue of --brand) interleaved with neutrals.
   * Every fill is >= 3:1 on --paper/--surface; adjacent slots differ by
   * OKLab dE >= 16 (>= 15 under protan/deutan simulation). */
  --chart-1:#264873;
  --chart-2:#929292;
  --chart-3:#3a6aa7;
  --chart-4:#484848;
  --chart-5:#5d8ece;
  --chart-6:#696969;
  --chart-muted:#a6a6a6;
  --chart-grid:#e8e8e8;
  /* Text colour that clears contrast on top of each fill (in-bar labels). */
  --chart-1-ink:#fff;
  --chart-2-ink:#191919;
  --chart-3-ink:#fff;
  --chart-4-ink:#fff;
  --chart-5-ink:#fff;
  --chart-6-ink:#fff;
  --chart-muted-ink:#191919;
}
html[data-theme="dark"]{
  --brand:#8fadd6;
  --brand-tint:#233047;
  --caution:#e0b35a;
  --chart-1:#8fadd6;
  --chart-2:#696969;
  --chart-3:#b3d4ff;
  --chart-4:#989898;
  --chart-5:#3f6aa1;
  --chart-6:#bebebe;
  --chart-muted:#626262;
  --chart-grid:#2a2a2a;
  --chart-1-ink:#111;
  --chart-2-ink:#eee;
  --chart-3-ink:#111;
  --chart-4-ink:#111;
  --chart-5-ink:#eee;
  --chart-6-ink:#111;
  --chart-muted-ink:#eee;
}

/* 2 · Shared primitives. Keep values in sync with styles.css. --------------- */
[hidden]{display:none!important}
.container{width:min(1180px,calc(100% - 96px));margin-inline:auto}
.section{padding-block:68px}
.ruled{border-top:1px solid var(--line)}
.section-heading{display:grid;grid-template-columns:1.05fr 1fr;gap:70px;align-items:start;margin-bottom:30px}
.section-heading.compact{margin-bottom:30px}
.kicker{font-family:var(--sans);font-weight:600;font-size:11px;line-height:1.5;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0 0 13px}
.lead{font-size:15px;line-height:1.75;color:var(--soft);max-width:510px}
.text-link{font-size:14px;display:inline-flex;align-items:center;gap:16px;text-decoration:underline;text-decoration-color:var(--muted);text-underline-offset:5px}
.text-link:hover{text-decoration-color:var(--ink)}
.button{display:inline-flex;align-items:center;justify-content:center;gap:25px;min-height:48px;border:1px solid var(--strong-line);padding:11px 20px;border-radius:3px;font-size:14px;font-weight:500;transition:background .18s,border-color .18s}
.button.primary{background:var(--ink);color:var(--inverse);border-color:var(--ink)}
.button:hover{background:var(--tint);border-color:var(--ink)}
.button.primary:hover{background:var(--soft);border-color:var(--soft)}
.button span{font-size:19px;font-weight:400;line-height:1}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.table-scroll{max-width:100%;overflow:auto;overscroll-behavior-x:contain}
.table-scroll:focus-visible,.diagram-scroll:focus-visible,.mountain-table-wrap:focus-visible{outline:2px solid var(--ink);outline-offset:-3px}
.skip-link{position:fixed;top:-100px;left:16px;background:var(--ink);color:var(--paper);padding:12px 18px;z-index:100}
.skip-link:focus{top:12px}
.reading-progress{position:fixed;top:0;left:0;width:100%;height:2px;z-index:50;pointer-events:none}
.reading-progress span{display:block;background:var(--ink);height:100%;width:0}
.site-footer{border-top:1px solid var(--strong-line);display:flex;align-items:center;justify-content:space-between;gap:20px;padding-block:32px;margin-bottom:20px}
.site-footer>.wordmark{font-size:20px}
.site-footer>p{font-size:13px;color:var(--muted);margin:0}
.site-footer>a:last-child{font-size:12px;color:var(--soft)}
.site-footer small{font-size:11px}
summary:focus-visible,pre:focus-visible,[role="tabpanel"]:focus-visible{outline:2px solid var(--ink);outline-offset:-4px}

/* 3 · Header and navigation ---------------------------------------------------- */
.site-header{position:sticky;top:0;z-index:30;background:var(--paper);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;min-height:var(--header-h);gap:32px}
.wordmark{display:inline-flex;align-items:baseline;white-space:nowrap;font-size:22px;font-weight:600;letter-spacing:-.035em;line-height:1}
.wordmark>span{font-weight:600}
.nav .wordmark{padding-block:4px}
.wordmark small{margin-left:13px;font-family:var(--mono);font-size:10px;font-weight:400;letter-spacing:.1em;align-self:center;border:0;padding:0;color:inherit}
.nav-links{display:flex;align-items:center;gap:25px;margin-left:auto}
.nav-links a{font-size:14px;color:var(--soft);padding-block:27px;position:relative}
.nav-links a:hover,.nav-links a[aria-current="location"],.nav-links a[aria-current="page"]{color:var(--ink)}
.nav-links a[aria-current="location"]::after,.nav-links a[aria-current="page"]::after{content:"";position:absolute;height:1px;bottom:19px;left:0;right:0;background:var(--ink)}
.nav-controls{display:flex;align-items:center;gap:10px}
.theme-toggle,.menu-toggle{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;border:1px solid var(--line);background:var(--paper);padding:8px 12px;border-radius:3px;font-size:13px}
.theme-toggle:hover,.menu-toggle:hover{background:var(--tint);border-color:var(--strong-line)}
.theme-icon{width:14px;height:14px;display:block;border:1.5px solid currentColor;border-radius:50%;background:linear-gradient(90deg,currentColor 50%,transparent 50%)}
html[data-theme="dark"] .theme-icon{transform:rotate(180deg)}
.menu-toggle{display:none}

/* 4 · Page hero, subnav, prose --------------------------------------------------- */
.page-hero{padding-block:54px 40px;border-bottom:1px solid var(--line)}
.page-hero h1{font-family:var(--heading);font-size:clamp(32px,3.6vw,44px);font-weight:650;line-height:1.15;letter-spacing:-.03em;margin:0;max-width:820px}
.page-hero h1 em{font-style:normal;font-weight:inherit;color:var(--soft)}
.page-hero .lead{margin-top:18px;max-width:640px;font-size:16px}
.page-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px;margin:22px 0 0;padding:0;list-style:none;font-size:12px;line-height:1.6;color:var(--muted)}
.page-meta a{text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--muted);padding-block:6px}
.page-meta a:hover{text-decoration-color:var(--ink)}
.page-meta code{font-size:11px}
/* Existing page margins include --header-h; add only the expanded header's extra height. */
html{scroll-padding-top:max(0px,calc(var(--header-offset,var(--header-h)) - var(--header-h)))}
.subnav{position:sticky;top:var(--header-offset,var(--header-h));z-index:20;background:var(--paper);border-bottom:1px solid var(--line)}
.subnav ol,.subnav ul{display:flex;flex-wrap:wrap;gap:0 26px;list-style:none;margin:0 auto;padding:0}
.subnav a{display:inline-block;padding:15px 0 12px;font-size:13px;line-height:1.4;color:var(--soft);border-bottom:2px solid transparent;margin-bottom:-1px}
.subnav a:hover,.subnav a[aria-current="location"]{color:var(--ink);border-bottom-color:var(--ink)}
.subnav-number{font-family:var(--mono);font-size:11px;color:var(--muted);margin-right:8px}
.subnav ~ .section,.subnav ~ * .section{scroll-margin-top:calc(var(--header-h) + 58px)}
.prose{max-width:68ch}
.prose p{font-size:15px;line-height:1.8;color:var(--soft)}
.prose .kicker{font-size:11px;line-height:1.5;color:var(--muted)}
.prose p+p,.prose ul+p,.prose p+ul{margin-top:14px}
.prose ul,.prose ol{margin:0;padding-left:20px;font-size:15px;line-height:1.8;color:var(--soft)}
.prose ol{list-style:decimal}
.prose li+li{margin-top:6px}
.prose strong{font-weight:600;color:var(--ink)}
.prose a{text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--muted)}
.prose a:hover{text-decoration-color:var(--ink)}
.prose h3,.prose h4{margin-top:30px;margin-bottom:10px}
.prose h4{font-size:16px;font-weight:600;letter-spacing:-.015em}
.note{font-size:12px;line-height:1.7;color:var(--muted)}
.note a,.chart-source a,.callout a,.kv a,.card a.inline{text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--muted)}
.mono{font-family:var(--mono)}
.grid-2,.grid-3{display:grid;gap:20px;align-items:start}
.grid-2>*,.grid-3>*{min-width:0}
.grid-2.stretch,.grid-3.stretch{align-items:stretch}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.stack>*+*{margin-top:20px}
.stack.tight>*+*{margin-top:12px}
.stack.loose>*+*{margin-top:32px}

/* 5 · Stat strip, cards, key-value lists, comparison tables ----------------------- */
.stat-strip{--cols:4;--cols-cap:99;display:grid;grid-template-columns:repeat(var(--cols),minmax(0,1fr));grid-template-columns:repeat(min(var(--cols),var(--cols-cap)),minmax(0,1fr));gap:1px;background:var(--line);border-block:1px solid var(--line);margin:0;padding:0;list-style:none}
.stat{background:var(--paper);padding:26px 24px 24px;min-width:0}
.stat:first-child{padding-left:0}
.stat strong{display:block;font-family:var(--heading);font-size:40px;font-weight:600;letter-spacing:-.03em;line-height:1;overflow-wrap:anywhere}
.stat strong sup{font-size:14px;font-weight:500;letter-spacing:0;vertical-align:top;top:.15em;position:relative;margin-left:2px;color:var(--muted)}
.stat span{display:block;font-size:12.5px;line-height:1.6;color:var(--soft);margin-top:9px}
.stat small{display:block;font-family:var(--mono);font-size:11px;line-height:1.6;color:var(--muted);margin-top:6px}
.card-grid{--cols:3;--cols-cap:99;display:grid;grid-template-columns:repeat(var(--cols),minmax(0,1fr));grid-template-columns:repeat(min(var(--cols),var(--cols-cap)),minmax(0,1fr));gap:20px;margin:0;padding:0;list-style:none}
.card{display:flex;flex-direction:column;min-width:0;padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
.card.tinted{background:var(--tint)}
.card-label,.card p.card-label{font-family:var(--mono);font-size:11px;line-height:1.6;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0 0 12px;display:flex;justify-content:space-between;gap:12px;align-items:center}
.card h3{font-size:19px;line-height:1.35;letter-spacing:-.02em;font-weight:600;margin:0;overflow-wrap:anywhere}
.card h4{font-size:15px;line-height:1.4;font-weight:600;margin:0}
.card p{font-size:14px;line-height:1.75;color:var(--soft);margin:10px 0 0}
.card .kv{margin-top:16px}
.card-footer{margin-top:auto;padding-top:16px;border-top:1px solid var(--line);font-size:12px;line-height:1.6;color:var(--muted);display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 14px}
.card>:has(+.card-footer){margin-bottom:18px}
.card-footer .text-link{font-size:12px;gap:10px;padding-block:3px;margin-block:-3px}
.kv{display:grid;grid-template-columns:minmax(120px,max-content) 1fr;margin:0;font-size:13px;line-height:1.6}
.kv dt,.kv dd{padding:10px 0;border-top:1px solid var(--line);min-width:0}
.kv dt{font-weight:500;color:var(--ink);padding-right:24px}
.kv dd{margin:0;color:var(--soft);overflow-wrap:anywhere}
.kv dd code,.kv.mono dd{font-family:var(--mono);font-size:12px}
.kv.ruled-end dt:nth-last-child(2),.kv.ruled-end dd:last-child{border-bottom:1px solid var(--line)}
.compare-table{width:100%;border-collapse:separate;border-spacing:0;font-size:13px;line-height:1.5;font-variant-numeric:tabular-nums;text-align:left}
.compare-table caption{caption-side:top;text-align:left;font-size:12px;line-height:1.7;color:var(--muted);padding:0 0 10px}
.compare-table th,.compare-table td{padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top;background:var(--paper)}
.compare-table thead th{font-size:11px;line-height:1.5;font-weight:600;color:var(--soft);background:var(--tint);white-space:nowrap}
.compare-table tbody th{font-weight:500;color:var(--ink)}
.compare-table .num,.compare-table th.num,.compare-table td.num{text-align:right;white-space:nowrap}
.compare-table tbody tr:hover>*{background:var(--tint)}
.compare-table tr.is-highlight>*{background:var(--tint);font-weight:500}
.compare-table tfoot td,.compare-table tfoot th{font-size:12px;color:var(--muted);border-bottom:0}
.compare-table small{font-size:11px;color:var(--muted)}
.compare-table.wide{min-width:760px}
.compare-table .badge{vertical-align:middle}

/* 6 · Charts -------------------------------------------------------------------- */
.chart{margin:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:22px 24px 18px;min-width:0}
.chart.plain{border:0;padding:0;background:transparent}
.chart-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:4px 18px;margin:0 0 16px}
.chart-title{font-size:16px;font-weight:600;letter-spacing:-.015em;line-height:1.35;margin:0;color:var(--ink)}
.chart-subtitle{font-size:12.5px;line-height:1.6;color:var(--muted);margin:0;flex-basis:100%}
.chart-head .badge{margin-left:auto;flex-basis:auto}
.chart-canvas{min-width:0}
.chart-canvas svg{display:block;width:100%;height:auto;overflow:visible;font-family:var(--sans)}
.chart-canvas svg text{font-family:var(--sans)}
.chart-canvas .label{fill:var(--ink)}
.chart-canvas .value{fill:var(--ink);font-weight:500}
.chart-canvas .tick,.chart-canvas .note,.chart-canvas .axis-title{fill:var(--muted)}
.chart-canvas .grid{stroke:var(--chart-grid);stroke-width:1;shape-rendering:crispEdges}
.chart-canvas .baseline{stroke:var(--strong-line);stroke-width:1;shape-rendering:crispEdges}
.chart-canvas .rule{stroke:var(--ink);stroke-width:1;shape-rendering:crispEdges;opacity:.7}
.chart-canvas .s1{fill:var(--chart-1)}.chart-canvas .s2{fill:var(--chart-2)}.chart-canvas .s3{fill:var(--chart-3)}
.chart-canvas .s4{fill:var(--chart-4)}.chart-canvas .s5{fill:var(--chart-5)}.chart-canvas .s6{fill:var(--chart-6)}
.chart-canvas .muted{fill:var(--chart-muted)}
.chart-canvas .on-s1{fill:var(--chart-1-ink)}.chart-canvas .on-s2{fill:var(--chart-2-ink)}.chart-canvas .on-s3{fill:var(--chart-3-ink)}
.chart-canvas .on-s4{fill:var(--chart-4-ink)}.chart-canvas .on-s5{fill:var(--chart-5-ink)}.chart-canvas .on-s6{fill:var(--chart-6-ink)}
.chart-canvas .on-muted{fill:var(--chart-muted-ink)}
.chart-canvas .mark{transition:opacity .15s}
.chart-canvas .row:hover .mark{opacity:.82}
.chart-legend{display:flex;flex-wrap:wrap;gap:6px 18px;list-style:none;margin:14px 0 0;padding:0;font-size:12px;line-height:1.5;color:var(--soft)}
.chart-legend li{display:inline-flex;align-items:center;gap:7px}
.swatch{display:inline-block;width:12px;height:12px;border-radius:2px;flex:none;vertical-align:-1px}
.swatch.s1{background:var(--chart-1)}.swatch.s2{background:var(--chart-2)}.swatch.s3{background:var(--chart-3)}
.swatch.s4{background:var(--chart-4)}.swatch.s5{background:var(--chart-5)}.swatch.s6{background:var(--chart-6)}
.swatch.muted{background:var(--chart-muted)}
.chart-table{margin-top:14px;border-top:1px solid var(--line);padding-top:10px}
.chart-table summary{cursor:pointer;font-size:12px;line-height:1.6;color:var(--soft);list-style:none;display:flex;align-items:center;gap:8px;width:fit-content;padding:4px 0}
.chart-table summary::-webkit-details-marker{display:none}
.chart-table summary::before{content:"+";font-family:var(--mono);font-size:13px;width:14px;color:var(--muted)}
.chart-table[open] summary::before{content:"\2212"}
.chart-table summary:hover{color:var(--ink)}
.chart-table table{width:100%;border-collapse:separate;border-spacing:0;font-size:12.5px;line-height:1.5;margin-top:8px;font-variant-numeric:tabular-nums;text-align:left}
.chart-table caption{caption-side:top;text-align:left;font-size:11.5px;color:var(--muted);padding:0 0 8px}
.chart-table th,.chart-table td{padding:7px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.chart-table thead th{font-size:11px;font-weight:600;color:var(--soft);background:var(--tint)}
.chart-table tbody th{font-weight:500}
.chart-table .num{text-align:right;white-space:nowrap}
.chart-table tr:last-child>*{border-bottom:0}
.chart-source{margin:12px 0 0;font-size:11.5px;line-height:1.7;color:var(--muted)}
.chart-source a:hover{text-decoration-color:var(--ink)}
html:not(.js) .chart-canvas:empty{display:none}

/* 7 · Trajectory steps, code panels, callouts --------------------------------- */
.steps{list-style:none;margin:0;padding:0}
.step{position:relative;display:grid;grid-template-columns:40px minmax(0,1fr);column-gap:18px;padding-bottom:30px}
.step::before{content:"";position:absolute;left:19.5px;top:44px;bottom:0;width:1px;background:var(--line)}
.step:last-child{padding-bottom:0}
.step:last-child::before{display:none}
.step-marker{width:40px;height:40px;border:1px solid var(--strong-line);border-radius:50%;display:grid;place-items:center;background:var(--paper);font-family:var(--mono);font-size:12px;color:var(--ink)}
.step.is-final .step-marker{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.step-body{min-width:0}
.step-head{display:flex;flex-wrap:wrap;align-items:center;gap:6px 12px;min-height:40px}
.step-title{font-size:15px;font-weight:600;line-height:1.4;letter-spacing:-.01em;margin:0}
.step-meta{font-family:var(--mono);font-size:11px;line-height:1.6;color:var(--muted);margin-left:auto;white-space:nowrap}
.step-body>*+*{margin-top:12px}
.step-body>p{font-size:14px;line-height:1.75;color:var(--soft);max-width:70ch}
.role-badge{display:inline-flex;align-items:center;gap:6px;padding:3px 8px;border-radius:var(--radius);border:1px solid transparent;font-size:11px;font-weight:600;line-height:1.5;letter-spacing:.02em;white-space:nowrap}
.role-badge.model{background:var(--brand-tint);color:var(--brand)}
.role-badge.harness{border-color:var(--strong-line);color:var(--ink);background:var(--paper)}
.role-badge.scorer{background:var(--tint);color:var(--soft);border-color:var(--line)}
.code-panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--tint);min-width:0;overflow:hidden}
.code-panel-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:4px 16px;padding:10px 16px;border-bottom:1px solid var(--line);font-family:var(--mono);font-size:11px;line-height:1.6;letter-spacing:.02em;color:var(--muted)}
.code-panel-label{color:var(--ink);font-weight:500}
.code-panel pre{margin:0;padding:16px;overflow:auto;max-height:var(--code-max,440px);font-family:var(--mono);font-size:12px;line-height:1.7;tab-size:2;color:var(--ink);overscroll-behavior:contain}
.code-panel pre code{font-size:inherit;font-family:inherit}
.code-panel.wrap pre{white-space:pre-wrap;overflow-wrap:anywhere}
.code-panel .code-line{display:block;min-height:1.7em;padding-left:34px;position:relative}
.code-panel pre{counter-reset:code-line}
.code-panel .code-line::before{counter-increment:code-line;content:counter(code-line);position:absolute;left:0;width:20px;text-align:right;color:var(--muted);user-select:none}
.code-panel .code-note{padding:10px 16px;border-top:1px solid var(--line);font-size:11.5px;line-height:1.7;color:var(--soft)}
.code-panel.inverse{background:#181d24;color:#e9edf3;border-color:#303843}
.code-panel.inverse .code-panel-head{border-color:#353c46;color:#b6c0ce}
.code-panel.inverse .code-panel-label{color:#e9edf3}
.code-panel.inverse pre{color:#e9edf3}
.code-panel.inverse .code-line::before{color:#8490a0}
.code-panel.inverse .code-note{border-color:#353c46;color:#b6c0ce}
.code-panel.inverse .code-function{color:#bad7fb}.code-panel.inverse .code-string{color:#e4d2ab}.code-panel.inverse .code-comment{color:#a1adba}
.code-panel.inverse pre:focus-visible{outline-color:#c4d5ed}
details.code-panel>summary.code-panel-head{cursor:pointer;list-style:none}
details.code-panel>summary::-webkit-details-marker{display:none}
details.code-panel>summary .code-panel-meta::after{content:" +";color:var(--muted)}
details.code-panel[open]>summary .code-panel-meta::after{content:" \2212"}
details.code-panel:not([open])>summary.code-panel-head{border-bottom:0}
.callout{border:1px solid var(--line);border-left:3px solid var(--ink);border-radius:var(--radius);padding:15px 20px;background:var(--surface);font-size:14px;line-height:1.75;color:var(--soft)}
.callout.info{border-left-color:var(--brand)}
.callout.caution{border-left-color:var(--caution)}
.callout-title{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink);margin:0 0 6px}
.callout.caution .callout-title{color:var(--caution)}
.callout p{margin:0}
.callout p+p{margin-top:8px}
.callout strong{font-weight:600;color:var(--ink)}

/* 8 · Badges, pills, tabs, diagrams, page footer nav ---------------------------- */
.badge,.pill{display:inline-flex;align-items:center;gap:6px;white-space:nowrap;border:1px solid var(--line);border-radius:var(--radius);padding:3px 8px;font-family:var(--mono);font-size:11px;line-height:1.6;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);vertical-align:middle}
.badge::before{content:"";width:6px;height:6px;border-radius:50%;border:1px solid currentColor;flex:none}
.badge.audited{border-color:var(--strong-line);color:var(--ink)}
.badge.audited::before{background:currentColor}
.badge.real-run{background:var(--brand-tint);border-color:transparent;color:var(--brand)}
.badge.real-run::before{background:currentColor;border-color:currentColor}
.badge.interim{color:var(--soft)}
.badge.interim::before{background:linear-gradient(90deg,currentColor 50%,transparent 50%)}
.badge.pilot{color:var(--soft)}
.badge.withheld{background:var(--tint);border-color:var(--line);color:var(--muted)}
.badge.withheld::before{border-style:solid;background:repeating-linear-gradient(45deg,currentColor 0 1px,transparent 1px 3px)}
.badge.tba{border-color:var(--line);color:var(--muted)}
.badge.tba::before{display:none}
.pill{border-radius:999px;text-transform:none;letter-spacing:0;font-family:var(--sans);font-size:11.5px;padding:4px 10px;color:var(--soft);background:var(--tint)}
.pill-list{display:flex;flex-wrap:wrap;gap:7px;list-style:none;margin:0;padding:0}
.tabs{border:1px solid var(--strong-line);border-radius:var(--radius);overflow:hidden;background:var(--paper)}
.tablist{display:flex;flex-wrap:wrap;gap:1px;background:var(--line);border-bottom:1px solid var(--line)}
.tablist [role="tab"]{flex:1 1 auto;min-width:0;display:flex;align-items:center;gap:12px;min-height:64px;padding:16px 22px;border:0;background:var(--tint);text-align:left;position:relative;font:inherit;font-size:15px;font-weight:500;line-height:1.4;color:var(--soft)}
.tablist [role="tab"]:hover{color:var(--ink)}
.tablist [role="tab"][aria-selected="true"]{background:var(--paper);color:var(--ink)}
.tablist [role="tab"][aria-selected="true"]::after{content:"";position:absolute;height:3px;bottom:-1px;left:0;right:0;background:var(--ink)}
.tablist [role="tab"]:focus-visible{outline-offset:-6px}
.tablist .tab-number{font-family:var(--mono);font-size:11px;color:var(--muted);font-weight:400}
.tablist small{display:block;font-size:11.5px;color:var(--muted);font-weight:400;margin-top:2px}
.tabpanel{padding:28px}
.tabpanel+.tabpanel{border-top:1px solid var(--line)}
.js .tabpanel+.tabpanel{border-top:0}
.tabs.compact .tablist [role="tab"]{min-height:48px;padding:12px 18px;font-size:13.5px}
.tabs.compact .tabpanel{padding:20px}
.diagram{margin:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:24px;min-width:0}
.diagram-scroll{overflow-x:auto;overscroll-behavior-x:contain}
.diagram svg{display:block;width:100%;max-width:var(--diagram-max,none);height:auto;margin-inline:auto;font-family:var(--sans)}
.diagram.wide .diagram-scroll svg{min-width:var(--diagram-min,640px)}
.diagram .node{fill:var(--paper);stroke:var(--strong-line);stroke-width:1}
.diagram .node.tint{fill:var(--tint)}
.diagram .node.brand{fill:var(--brand-tint);stroke:var(--brand)}
.diagram .node.ink{fill:var(--ink);stroke:var(--ink)}
.diagram .edge{fill:none;stroke:var(--strong-line);stroke-width:1}
.diagram .edge.strong{stroke:var(--ink)}
.diagram .arrow{fill:var(--strong-line)}
.diagram .arrow.strong{fill:var(--ink)}
.diagram text{fill:var(--ink);font-size:13px}
.diagram .t-label{fill:var(--muted);font-size:11px;font-family:var(--mono);letter-spacing:.04em;text-transform:uppercase}
.diagram .t-strong{font-weight:600}
.diagram .t-inverse{fill:var(--paper)}
.diagram .t-brand{fill:var(--brand)}
.diagram .t-small{font-size:11.5px;fill:var(--soft)}
.diagram figcaption{margin-top:16px;font-size:12px;line-height:1.7;color:var(--muted)}
.page-footer-nav{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border-block:1px solid var(--line);margin:0}
.page-footer-nav a{display:flex;flex-direction:column;gap:6px;padding:24px 0;background:var(--paper);min-width:0}
.page-footer-nav a+a{text-align:right;align-items:flex-end;padding-left:24px}
.page-footer-nav a:first-child{padding-right:24px}
.page-footer-nav a:only-child{grid-column:2}
.page-footer-nav small{font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.page-footer-nav span{font-size:18px;font-weight:600;letter-spacing:-.02em;line-height:1.3;display:inline-flex;gap:10px;align-items:center}
.page-footer-nav a:hover span{text-decoration:underline;text-underline-offset:5px;text-decoration-color:var(--muted)}

/* 9 · Responsive ---------------------------------------------------------------- */
@media(min-width:1800px){.container{width:min(1320px,calc(100% - 120px))}}
@media(max-width:1100px){
  .nav{gap:20px}.nav-links{gap:18px}.wordmark small{display:none}
  .section-heading{gap:40px}
  .card-grid{--cols-cap:2}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .stat strong{font-size:36px}
}
@media(max-width:1000px){
  .nav-links{gap:18px}
  /* Keep the sticky subnav to one row: tighter metrics, and a scroll (not a wrap) when it still does not fit. */
  .subnav ol,.subnav ul{flex-wrap:nowrap;overflow-x:auto;gap:0 14px;padding-bottom:1px;scrollbar-width:none}
  .subnav ol::-webkit-scrollbar,.subnav ul::-webkit-scrollbar{display:none}
  .subnav li{flex:none}
  .subnav a{font-size:12.5px;white-space:nowrap}
  .subnav-number{margin-right:6px}
}
@media(max-width:860px){
  :root{--header-h:70px}
  .container{width:calc(100% - 48px)}
  .nav{flex-wrap:wrap;gap:0;justify-content:space-between;padding-block:12px}
  .nav-controls{margin-left:auto}
  .js .menu-toggle{display:inline-flex}
  .nav-links{order:3;width:100%;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0 16px;margin:12px 0 0;padding:6px 0 4px;border-top:1px solid var(--line)} /* open menu: 3 × 2, no orphan */
  .nav-links a{padding:9px 0;justify-self:start}
  .nav-links a[aria-current="location"]::after,.nav-links a[aria-current="page"]::after{bottom:3px}
  .js .nav-links{display:none}
  .js .nav-links.open{display:grid}
  .section{padding-block:52px}
  .section-heading{grid-template-columns:1fr;gap:18px;margin-bottom:26px}
  .lead{max-width:650px}
  .site-footer{flex-wrap:wrap}.site-footer>p{margin-left:auto}.site-footer>a:last-child{width:100%}
  .page-hero{padding-block:40px 32px}
  .subnav{position:static}
  .subnav ol,.subnav ul{flex-wrap:wrap;overflow:visible;gap:0 20px;padding-bottom:0} /* static below 860px: wrapping is fine again */
  .subnav a{padding:11px 0 9px;font-size:12.5px}
  .subnav ~ .section,.subnav ~ * .section{scroll-margin-top:calc(var(--header-h) + 16px)}
  .grid-2,.grid-3{grid-template-columns:minmax(0,1fr)}
  .stat-strip{--cols-cap:2}
  .stat{padding:20px 18px}
  .stat:first-child{padding-left:0}
  .stat:nth-child(2n){padding-right:0}
  .stat strong{font-size:34px}
  .card-grid{gap:16px}
  .card{padding:20px}
  .compare-table th,.compare-table td{padding:10px 12px}
  .chart{padding:18px 18px 14px}
  .tabpanel{padding:22px}
  .tablist [role="tab"]{min-height:56px;padding:14px 18px;font-size:14px}
  .step{grid-template-columns:32px minmax(0,1fr);column-gap:14px;padding-bottom:26px}
  .step::before{left:15.5px;top:36px}
  .step-marker{width:32px;height:32px;font-size:11px}
  .step-head{min-height:32px}
  .step-meta{margin-left:0;width:100%}
  .diagram{padding:18px}
  .page-footer-nav a{padding:20px 0}
  .page-footer-nav span{font-size:16px}
}
@media(max-width:520px){
  .container{width:calc(100% - 40px)}
  .wordmark{font-size:20px}
  .theme-toggle{min-width:44px;padding:8px 10px}
  .theme-toggle [data-theme-label]{display:none}
  .menu-toggle{font-size:12px;padding-inline:10px}
  .section{padding-block:43px}
  .kicker{font-size:11px;margin-bottom:12px}
  .lead{font-size:15px}
  .button{font-size:12px;gap:12px;padding-inline:14px}
  .site-footer{padding-block:28px}.site-footer>p{font-size:11px}
  .page-hero{padding-block:34px 28px}
  .page-hero h1{font-size:30px}
  .page-hero .lead{font-size:15px;margin-top:14px}
  .page-meta{gap:6px 16px;font-size:11.5px}
  .stat-strip{--cols-cap:2}
  .stat{padding:18px 14px}
  .stat strong{font-size:30px}
  .stat span{font-size:12px}
  .card-grid{--cols-cap:1;gap:14px}
  .card{padding:20px 18px}
  .card h3{font-size:18px}
  .kv{grid-template-columns:1fr}
  .kv dt{padding-bottom:2px;padding-right:0}
  .kv dd{border-top:0;padding-top:0}
  .compare-table{font-size:12.5px}
  .compare-table th,.compare-table td{padding:9px 10px}
  .chart{padding:16px 14px 12px}
  .chart-title{font-size:15px}
  .chart-table th,.chart-table td{padding:6px 8px}
  .tabs{border-radius:var(--radius)}
  .tablist [role="tab"]{flex-basis:40%;min-height:52px;padding:12px 14px;font-size:13px;gap:8px}
  .tablist [role="tab"]>span:last-child{min-width:0}
  .tabpanel{padding:18px 16px}
  .code-panel pre{padding:14px 12px;font-size:11.5px}
  .code-panel .code-line{padding-left:28px}
  .code-panel-head{padding:9px 12px}
  .callout{padding:13px 15px;font-size:13.5px}
  .diagram{padding:14px}
  .page-footer-nav{grid-template-columns:1fr}
  .page-footer-nav a,.page-footer-nav a+a{text-align:left;align-items:flex-start;padding:18px 0}
  .page-footer-nav a:only-child{grid-column:auto}
  .role-badge{font-size:10.5px}
}

/* 10 · Print and forced colours -------------------------------------------------- */
@media print{
  html,html[data-theme="dark"]{color-scheme:light;--paper:#fff;--surface:#fff;--ink:#191919;--soft:#555;--muted:#666;--line:#dedede;--strong-line:#bbb;--tint:#f5f5f5;--inverse:#fff;--brand:#264873;--brand-tint:#edf2fb;--chart-1:#264873;--chart-2:#929292;--chart-3:#3a6aa7;--chart-4:#484848;--chart-5:#5d8ece;--chart-6:#696969;--chart-muted:#a6a6a6;--chart-grid:#e8e8e8}
  body{-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .site-header,.reading-progress,.skip-link,.menu-toggle,.theme-toggle,.subnav,.page-footer-nav{display:none!important}
  .section{padding-block:32px}
  .card,.chart,.code-panel,.callout,.diagram,.step,.stat-strip,.compare-table tr{break-inside:avoid}
  .code-panel pre{max-height:none;overflow:visible;white-space:pre-wrap}
  .tabpanel[hidden]{display:block!important;border-top:1px solid var(--line)}
  a[href^="http"]::after{content:" (" attr(href) ")";font-size:.85em;color:var(--muted)}
}
@media(prefers-reduced-motion:reduce){.chart-canvas .mark,.button{transition:none}}
@media(forced-colors:active){
  .theme-icon{background:none;border-color:ButtonText}
  .theme-toggle[aria-pressed="true"]{outline:2px solid Highlight}
  .button.primary,.step.is-final .step-marker{border:1px solid ButtonText}
  .tablist [role="tab"][aria-selected="true"]{outline:2px solid Highlight;outline-offset:-4px}
  .subnav a[aria-current="location"],.nav-links a[aria-current="page"]{text-decoration:underline}
  .chart-canvas .s1,.chart-canvas .s3,.chart-canvas .s5{fill:CanvasText}
  .chart-canvas .s2,.chart-canvas .s4,.chart-canvas .s6,.chart-canvas .muted{fill:GrayText}
  .chart-canvas .grid,.chart-canvas .baseline{stroke:GrayText}
  .swatch{border:1px solid CanvasText}
  .badge,.pill,.role-badge,.callout,.card,.chart,.code-panel,.diagram{border-color:CanvasText}
}