/* RepairAhead design layer (Oct 19, 2026): split hero with the interactive engine diagram, "at a glance" card strip,
   early-vs-failure cost chart, numbered section labels, nav highlight, severity-striped part cards.
   Loaded AFTER styles.css on index.html (N20) and n55.html only. System fonts only; no images, no external requests.
   Remove this file + design.js and revert the hero/parts markup to roll back. */

/* ---------- hero: split layout ---------- */
.dz{padding:22px 0 30px;background:radial-gradient(900px 520px at 78% 18%,rgba(45,212,191,.15),transparent 62%),radial-gradient(600px 360px at 0% 0%,rgba(167,139,250,.10),transparent),linear-gradient(180deg,#0b0f17,#0a0e15)}
.dz-grid{display:grid;gap:14px;max-width:1340px;grid-template-columns:minmax(0,1fr)}
.dz-head,.dz-body1,.dz-body2,.dz-stage{min-width:0}
.dz h1{font-size:clamp(28px,4vw,52px);line-height:1.05;letter-spacing:-.035em;margin:0;text-wrap:balance}
.dz .eyebrow{margin-bottom:10px}
.dz .sub{font-size:16.5px;color:#c3cce0;margin:0 0 14px;max-width:600px}
.dz .vinbox{max-width:none;padding:14px;background:rgba(18,24,38,.85)}
.dz .recallbar{margin:0 0 14px}
.dz .hero-ctas{margin-top:12px}
@media(min-width:1024px){
  .dz{padding:26px 0 36px}
  .dz[data-engine="N20"] h1{font-size:clamp(30px,3.2vw,44px)}
  .dz[data-engine="N20"] .recallbar{font-size:14px;padding:10px 12px}
  .dz-grid{grid-template-columns:minmax(0,.86fr) minmax(0,1.14fr);grid-template-areas:"head stage" "b1 stage" "b2 stage";grid-template-rows:auto auto 1fr;column-gap:40px;row-gap:14px;align-items:start}
  .dz-head{grid-area:head}.dz-body1{grid-area:b1}.dz-body2{grid-area:b2}.dz-stage{grid-area:stage}
}
/* stage (diagram card) */
.dz-stage{position:relative;margin:0;background:linear-gradient(180deg,rgba(20,29,48,.9),rgba(12,17,28,.92));border:1px solid #2a3a5a;border-radius:20px;padding:12px 12px 14px;box-shadow:0 0 0 1px rgba(45,212,191,.05),0 40px 90px -40px rgba(45,212,191,.35),inset 0 1px 0 rgba(255,255,255,.04)}
.stage-top{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:2px 4px 8px;font-size:12px}
.stage-title{font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:#a9b6cf}
.stage-hint{color:var(--blue2);white-space:nowrap}
@media(max-width:520px){.stage-hint{display:none}}
.stage-svg{position:relative}
.stage-svg #bay{display:block;width:100%}
.dz-stage .legend{margin-top:10px;font-size:12px}
.stage-cap{font-size:12px;color:var(--muted);margin:8px 0 0}
/* floating part card (static under the diagram on phones) */
.pop{position:absolute;left:12px;top:12px;width:min(282px,50%);background:rgba(11,16,27,.95);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid #33456b;border-radius:14px;padding:11px 12px;box-shadow:0 24px 50px -20px rgba(0,0,0,.8);font-size:13px;pointer-events:none}
.pop.ready{transition:left .22s ease,top .22s ease}
.pop a{pointer-events:auto}
.pop .sev{margin:0 0 4px}
.pop-h{font-size:14px;font-weight:800;line-height:1.25;margin:0 0 8px}
.pop dl{display:grid;gap:5px;margin:0 0 8px}
.pop dl div{display:flex;justify-content:space-between;align-items:baseline;gap:8px;border-bottom:1px solid #1f2a40;padding-bottom:4px}
.pop dt{color:var(--muted);font-size:12px;white-space:nowrap}
.pop dd{margin:0;font-weight:700;text-align:right}
.pop dd.g{color:var(--green)}.pop dd.r{color:#ff8a8e}
.pop .tag{font-size:9.5px;padding:1px 4px;margin-left:3px}
.pop-x{margin:0 0 8px;color:#c3cce0;font-size:12.5px}
.pop-bar{height:6px;border-radius:9px;background:rgba(255,90,95,.35);overflow:hidden;margin:0 0 6px}.pop-bar i{display:block;height:100%;background:var(--green)}
.pop-foot{margin:0;font-size:12px;color:var(--muted)}
@media(max-width:699px){.pop{position:static;width:auto;margin-top:8px;pointer-events:auto;transition:none}}
/* part chips: swipeable row on phones, wraps on wider screens */
.chips{display:flex;gap:6px;overflow-x:auto;scroll-snap-type:x mandatory;padding:10px 2px 2px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.chips::-webkit-scrollbar{display:none}
@media(min-width:700px){.chips{flex-wrap:wrap;overflow:visible}}
.chip{position:relative;scroll-snap-align:start;flex:none;display:inline-flex;align-items:center;gap:7px;min-height:36px;padding:6px 11px 6px 7px;border-radius:99px;border:1px solid var(--line);background:#111827;color:#d6dcea;font:600 13px/1 inherit;font-family:inherit;cursor:pointer}
.chip i{width:20px;height:20px;border-radius:50%;display:grid;place-items:center;font-style:normal;font-size:11px;font-weight:800;color:#0b0f17}
.chip[aria-pressed=true]{border-color:var(--blue2);background:#10241f;color:#fff}
.chip:hover{border-color:#3c5078}
.vh{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
/* hotspots */
#bay .hot .dot{filter:drop-shadow(0 0 6px rgba(255,255,255,.18))}
#bay .hot.active .dot{stroke:#fff;stroke-width:3.5}
#bay .hot:focus{outline:none}#bay .hot:focus-visible .dot{stroke:#fff;stroke-width:4}
@media(max-width:699px){#bay .hot circle{r:21px}#bay .hot text{font-size:20px;transform:translateY(3px)}}
/* N55 compact recall badge + drawer (N20 keeps the full recall box) */
.recallchip{background:linear-gradient(180deg,rgba(255,90,95,.10),rgba(255,90,95,.05));border:1px solid rgba(255,90,95,.38);border-radius:12px;padding:10px 12px;font-size:13.5px;line-height:1.45;margin:0 0 4px}
.rc-line{display:flex;gap:9px;margin:0}
.rc-ico{color:#ff8a8e;font-size:15px;line-height:1.3}
.recallchip b{color:#ffc2c4}
.rc-more{background:none;border:0;padding:0;margin:6px 0 0 24px}
.rc-more summary{padding:4px 0;font-weight:600;font-size:13px;color:var(--blue2);justify-content:flex-start;gap:6px;min-height:24px}
.rc-more summary::after{font-size:15px}
.rc-body{font-size:13.5px;color:#d9dfeb;padding:4px 0 2px}
.models-line{font-size:13px;color:var(--muted);margin:12px 0 0}
.models-line .ml-k{color:var(--text);font-weight:700}

/* ---------- "at a glance" card strip ---------- */
.kpis{padding:6px 0 30px;border-top:0}
.kpis .wrap{max-width:1340px}
.kpi-grid{display:grid;gap:12px;grid-template-columns:minmax(0,1fr)}
@media(min-width:640px){.kpi-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(min-width:1100px){.kpi-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
.kpi{position:relative;background:linear-gradient(180deg,rgba(24,32,51,.72),rgba(14,19,31,.8));border:1px solid rgba(70,90,130,.35);border-radius:18px;padding:16px;box-shadow:inset 0 1px 0 rgba(255,255,255,.05),0 20px 50px -30px rgba(0,0,0,.8);min-width:0;display:flex;flex-direction:column}
.kpi-k{display:block;font-size:11.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:#9fb0cc;margin-bottom:8px}
.kpi-n{font-size:clamp(28px,3vw,38px);font-weight:800;letter-spacing:-.035em;line-height:1;margin:0 0 8px;font-variant-numeric:tabular-nums}
.kpi-n small{font-size:.45em;color:var(--muted);font-weight:600;letter-spacing:0}
.kpi-p{font-size:13px;color:#b8c3d8;margin:0 0 8px;line-height:1.45}
.kpi ul{list-style:none;padding:0;margin:0 0 8px;font-size:12.5px;color:var(--muted);display:grid;gap:3px}
.kpi>a,.kpi .kpi-a{margin-top:auto;font-size:13px;font-weight:600;padding:4px 0}
.k-recall{border-color:rgba(255,90,95,.35);background:linear-gradient(180deg,rgba(60,22,30,.45),rgba(14,19,31,.8))}
.k-recall b{color:#ffc2c4}
.spark{height:52px;margin:0 0 6px}
.spark svg{display:block;width:100%;height:52px}
.spark .area{fill:url(#sparkG)}.spark .ln{fill:none;stroke:var(--blue2);stroke-width:4}.spark .md{stroke:#fff;stroke-width:3;stroke-dasharray:8 6}
.cost-pair{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:8px}
.cost-pair span{display:block;font-size:12px;color:var(--muted)}
.cost-pair b{display:block;font-size:clamp(22px,2.2vw,28px);letter-spacing:-.03em;font-variant-numeric:tabular-nums;min-height:1.2em}
.cost-pair .g{color:var(--green)}.cost-pair .r{color:#ff8a8e}
.cost-bar{height:8px;border-radius:9px;background:rgba(255,90,95,.35);overflow:hidden;margin-bottom:8px}.cost-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,#1fb985,var(--green));transition:width .8s cubic-bezier(.2,.8,.2,1)}

/* ---------- sections: gradient dividers + numbered labels ---------- */
main section{border-top:0;position:relative}
main section+section::before{content:"";position:absolute;left:50%;top:0;transform:translateX(-50%);width:min(1140px,92%);height:1px;background:linear-gradient(90deg,transparent,#2b3a5c 20%,rgba(45,212,191,.45) 50%,#2b3a5c 80%,transparent)}
main section.kpis::before{display:none}
.sec-k{display:block;font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--blue2);margin-bottom:8px}
/* nav: current-section highlight + reading progress */
.nav .links a{padding:5px 9px;border-radius:99px}
.nav .links{gap:6px}
.nav .links a.on{background:#10241f;color:#fff;box-shadow:inset 0 0 0 1px rgba(45,212,191,.45)}
.nav .progress{position:absolute;left:0;bottom:-1px;height:2px;width:100%;transform-origin:0 50%;transform:scaleX(var(--p,0));background:linear-gradient(90deg,var(--blue2),#7dd3fc);pointer-events:none}
.nav{position:sticky}

/* ---------- parts section without the diagram ---------- */
.parts-detail{margin-bottom:14px;scroll-margin-top:72px}
@media(min-width:900px){.parts-detail{columns:2;column-gap:28px;padding:20px}.parts-detail>*{break-inside:avoid}}
.kv .tag{display:inline-block;width:auto;margin-top:3px}
.card{position:relative;padding-left:18px;overflow:hidden;transition:transform .2s,box-shadow .2s,border-color .2s}
.card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--sev,#4d9bff)}
.card:hover{transform:translateY(-2px);box-shadow:0 18px 40px -24px rgba(45,212,191,.5)}

/* ---------- early-vs-failure cost chart (SVG) ---------- */
.dumb{margin:4px 0 16px;padding:14px}
.dumb svg{display:block;width:100%;height:auto}
.dumb .lbl{fill:#d6dcea;font:600 13px system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.dumb .ax{fill:var(--muted);font:11px system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.dumb .gl{stroke:#22304a}
.dumb .rng{stroke-width:7;stroke-linecap:round;opacity:.55}
.dumb .early{fill:var(--green)}.dumb .fail{fill:#ff8a8e}
.dumb .lg{font-size:12.5px;color:var(--muted);display:flex;gap:6px 14px;flex-wrap:wrap;margin-top:6px}
.dumb .lg i{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:5px;vertical-align:-1px}
.cw-chart .area{fill:url(#cwG)}

@media(prefers-reduced-motion:reduce){.pop,.pop.ready,.card,.cost-bar i{transition:none}.card:hover{transform:none}}
/* diagram part labels: lift the faint SVG label fills to >=4.5:1 on the stage background (hotspot numbers keep their own dark fill) */
.dz-stage #bay text:not(.hot text){fill:#a3aec4}
.rid{white-space:nowrap}
.chips:empty{min-height:46px}@media(min-width:700px){.chips:empty{min-height:90px}}
.pop:not(.placed){visibility:hidden}