/* Shared CSS for the exam engine (site/assets/js/quiz-engine.js): the app
   shell, the question card and the results screen. Shared by every exam page
   under site/<slug>/. Each page still keeps its own <style> block for the
   marketing/landing part (hero, buy card, FAQ...) and its own brand tokens
   (CSS variables), which this file relies on: --surface, --rule, --ink,
   --brand, --s1..--s5, --good, --bad, --mono, --sans, --display, --shadow. */

/* ============ app shell ============ */
.app{display:none;padding:26px 0 90px}
.app.on{display:block}
.agrid{display:grid;grid-template-columns:238px 1fr;gap:30px;align-items:start}
.rail{position:sticky;top:66px;display:flex;flex-direction:column;gap:16px}
@media(max-width:980px){
  .agrid{grid-template-columns:1fr;gap:18px}
  /* the rail stops being a box of its own so its panels can be ordered
     around the question instead of all sitting on top of it */
  .rail{display:contents}
  .panel-status{order:1}
  #stage{order:2}
  .panel-nav{order:3}
  .panel-actions{order:4}
  /* status is one compact row on a phone, not a stacked card.
     !important on the margin because the exam-mode row carries an inline
     margin-top that would reopen the gap this rule is closing. */
  .panel-status{display:flex;align-items:center;gap:6px 14px;flex-wrap:wrap;padding:11px 16px}
  .panel-status h3{margin:0;flex:none}
  .panel-status .timer{font-size:19px;flex:none}
  .panel-status .rstat{padding:0;margin:0 0 0 auto!important;gap:10px;flex:none}
}
.panel{background:var(--surface);border:1px solid var(--rule);border-radius:13px;padding:17px}
.panel h3{font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.11em;text-transform:uppercase;color:var(--ink-3);margin-bottom:13px}
.timer{font-family:var(--mono);font-size:27px;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.timer.warn{color:var(--bad)}
.rstat{display:flex;justify-content:space-between;font-family:var(--mono);font-size:12px;color:var(--ink-2);padding:4px 0}
.rstat b{color:var(--ink);font-variant-numeric:tabular-nums}
.navg{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}
.ncell{aspect-ratio:1;min-height:36px;border:1px solid var(--rule);border-radius:6px;font-family:var(--mono);font-size:12px;color:var(--ink-3);display:flex;align-items:center;justify-content:center;position:relative;background:var(--paper);transition:border-color .14s,background .14s}
.ncell:hover{border-color:var(--brand)}
.ncell.cur{outline:2px solid var(--brand);outline-offset:1px;color:var(--ink);font-weight:600}
.ncell.ans{background:var(--surface-2);color:var(--ink)}
.ncell.ok{background:var(--good-soft);border-color:var(--good);color:var(--good)}
.ncell.no{background:var(--bad-soft);border-color:var(--bad);color:var(--bad)}
.ncell.flag::after{content:"";position:absolute;top:-2px;right:-2px;width:6px;height:6px;border-radius:50%;background:var(--accent)}
/* section stripe: sits under the answered/correct/wrong backgrounds rather
   than competing with them, so both readings survive at once */
.ncell::before{content:"";position:absolute;left:3px;right:3px;bottom:2px;height:2.5px;border-radius:2px;background:var(--sc,transparent)}
.ncell.s1{--sc:var(--s1)} .ncell.s2{--sc:var(--s2)} .ncell.s3{--sc:var(--s3)}
.ncell.s4{--sc:var(--s4)} .ncell.s5{--sc:var(--s5)}
.navkey{display:flex;flex-wrap:wrap;gap:8px;margin-top:11px}
.navkey span{display:flex;align-items:center;gap:4px;font-family:var(--mono);font-size:10px;color:var(--ink-3)}
.navkey i{width:9px;height:2.5px;border-radius:2px;display:block}

.qcard{background:var(--surface);border:1px solid var(--rule);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}
.qhead{display:flex;align-items:center;gap:9px;padding:15px 26px;border-bottom:1px solid var(--rule);background:var(--sunk);flex-wrap:wrap}
.chip{font-family:var(--mono);font-size:10.5px;letter-spacing:.06em;padding:4px 9px;border-radius:6px;border:1px solid var(--rule-2);color:var(--ink-2);line-height:1.5}
.chip.dom{background:var(--trace-soft);border-color:transparent;color:var(--trace)}
.chip.H{background:var(--bad-soft);border-color:transparent;color:var(--bad)}
.chip.M{background:var(--brand-soft);border-color:transparent;color:var(--brand)}
.fbtn{margin-left:auto;min-height:44px;display:inline-flex;align-items:center;font-family:var(--mono);font-size:11px;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-3);border:1px solid var(--rule);padding:0 14px;border-radius:7px;transition:.14s}
.fbtn[aria-pressed="true"]{color:var(--accent);border-color:var(--accent);background:var(--accent-soft)}
.qbody{padding:26px 26px 10px}
.stem{font-size:17px;line-height:1.65;max-width:70ch;color:var(--ink)}
.opts{display:flex;flex-direction:column;gap:8px;margin:22px 0 0}
.opt{display:flex;gap:13px;align-items:flex-start;width:100%;text-align:left;padding:14px 16px;border:1px solid var(--rule);border-radius:11px;background:var(--paper);transition:border-color .15s,background .15s;will-change:transform}
.opt:hover:not(:disabled){border-color:var(--brand);background:var(--surface-2)}
.opt:disabled{cursor:default}
.okey{font-family:var(--mono);font-size:12px;font-weight:600;width:23px;height:23px;flex:none;border:1px solid var(--rule-2);border-radius:6px;display:flex;align-items:center;justify-content:center;color:var(--ink-2);margin-top:1px;transition:.15s}
.opt.sel{border-color:var(--brand);background:var(--brand-soft)}
.opt.sel .okey{background:var(--brand);border-color:var(--brand);color:var(--btn-ink)}
.opt.correct{border-color:var(--good);background:var(--good-soft)}
.opt.correct .okey{background:var(--good);border-color:var(--good);color:var(--paper)}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.opt.wrong .okey{background:var(--bad);border-color:var(--bad);color:var(--paper)}
.otext{font-size:15.5px;line-height:1.6}

.explain{border-top:1px solid var(--rule);margin-top:24px;padding:22px 26px 28px;background:var(--paper)}
.verdict{display:flex;align-items:center;gap:10px;font-family:var(--display);font-size:24px;letter-spacing:-.01em;margin-bottom:16px}
.verdict.ok{color:var(--good)}
.verdict.no{color:var(--bad)}
.rat{display:flex;flex-direction:column;gap:9px;margin-bottom:18px}
.rat-i{display:grid;grid-template-columns:22px 1fr;gap:12px;font-size:15.5px;color:var(--ink-2);line-height:1.55}
.rat-i .m{font-family:var(--mono);font-size:11.5px;font-weight:600;line-height:1.7;color:var(--ink-3)}
.rat-i.g{color:var(--ink)}
.rat-i.g .m{color:var(--good)}
.reflink{font-family:var(--mono);font-size:11.5px;color:var(--ink-3);margin-top:14px;display:block}
.qfoot{display:flex;gap:10px;align-items:center;padding:17px 26px;border-top:1px solid var(--rule);background:var(--surface)}
.hint{font-family:var(--mono);font-size:10.5px;color:var(--ink-3);margin-left:auto}
@media(max-width:660px){.hint{display:none}.qbody,.explain,.qfoot,.qhead{padding-left:18px;padding-right:18px}}

/* results */
.res{max-width:880px;margin:0 auto}
.shero{display:grid;grid-template-columns:auto 1fr;gap:36px;align-items:center;background:var(--surface);border:1px solid var(--rule);border-radius:16px;padding:32px;box-shadow:var(--shadow)}
@media(max-width:640px){.shero{grid-template-columns:1fr;gap:20px}}
.snum{font-family:var(--display);font-size:78px;line-height:.9;font-variant-numeric:tabular-nums;letter-spacing:-.03em}
.pill{display:inline-block;font-family:var(--mono);font-size:10.5px;letter-spacing:.11em;text-transform:uppercase;padding:6px 12px;border-radius:999px;margin-top:14px}
.pill.ok{background:var(--good-soft);color:var(--good)}
.pill.no{background:var(--bad-soft);color:var(--bad)}
.bars{display:flex;flex-direction:column;gap:15px;margin-top:30px}
.btop{display:flex;justify-content:space-between;align-items:baseline;gap:12px;font-size:14.5px}
.btop b{font-weight:600}
.btop span{font-family:var(--mono);font-size:12px;color:var(--ink-3);font-variant-numeric:tabular-nums}
.track{height:11px;background:var(--surface-2);border-radius:6px;position:relative;overflow:hidden;margin-top:7px}
.track i{display:block;height:100%;border-radius:6px;transform-origin:left center}
.thr{position:absolute;top:-4px;bottom:-4px;left:70%;width:1px;background:var(--ink-3)}