/* Recycled Exam Questions. Colour carries meaning only: red = verbatim, amber = partly copied,
   slate = refresh, green = new (no repeat). China vs Global is a tag, never a colour. */
:root{
  --bg:#fafaf7;--card:#fff;--ink:#16161a;--body:#2b2b30;--mut:#5f5e5a;--faint:#73716b;--line:#e4e2db;--soft:#f2f1ec;
  --v:#c4321f;--p:#d4920f;--r:#7d8696;--n:#9fd2ad;--link:#1d4f91;
  --serif:"Iowan Old Style","Palatino Linotype",Charter,"Bitstream Charter",Georgia,serif;  /* fonts already on the device: nothing to download, nothing swaps */
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,"Helvetica Neue",Arial,sans-serif;
  --w:1200px;color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scrollbar-gutter:stable}
body{margin:0;background:var(--bg);color:var(--body);font:16px/1.55 var(--sans);font-variant-numeric:tabular-nums}
a{color:var(--link);text-decoration-thickness:1px;text-underline-offset:2px}
button,input{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--link);outline-offset:2px;border-radius:3px}
[hidden]{display:none!important}
.wrap{max-width:var(--w);margin:0 auto;padding:0 20px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:8px;z-index:99;background:var(--card);padding:6px 10px}
.faint{color:var(--faint)}.small{font-size:13px}
kbd{font:600 11px var(--sans);color:var(--mut);border:1px solid var(--line);border-bottom-width:2px;border-radius:4px;padding:0 5px;background:var(--card)}
.loading,.empty{padding:80px 20px;text-align:center;color:var(--mut)}

/* ---------- header ---------- */
.top{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.top-in{display:flex;align-items:center;gap:8px;height:60px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font:700 16.5px var(--sans);letter-spacing:-.015em;white-space:nowrap;margin-right:22px}
.logo{display:inline-flex;gap:2px;padding:4px;background:var(--ink);border-radius:6px}.logo i{width:6px;height:12px;border-radius:1.5px;background:var(--v)}.logo i+i{background:#fff}
.links{display:flex;align-self:stretch;gap:4px}
.links a{position:relative;display:flex;align-items:center;padding:0 12px;text-decoration:none;font-size:15px;font-weight:500;color:var(--body);white-space:nowrap}
.links a:hover{color:var(--ink)}
.links a::after{content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:2px;border-radius:2px;background:transparent}
.links a:hover::after{background:var(--line)}
.links a.on{color:var(--ink);font-weight:650}.links a.on::after{background:var(--v)}
.links b{font-size:11px;background:var(--ink);color:#fff;border-radius:999px;padding:0 6px;margin-left:6px}
.search{position:relative;margin-left:auto;width:min(340px,100%)}
.search svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);width:16px;height:16px;fill:none;stroke:var(--mut);stroke-width:1.8;pointer-events:none}
.search input{width:100%;padding:9px 34px 9px 35px;border:1px solid var(--line);border-radius:9px;background:var(--soft);color:var(--ink);font:inherit;font-size:14.5px;transition:background .12s,border-color .12s}
.search input::placeholder{color:var(--faint)}
.search input:hover{border-color:#d3d0c8}
.search input:focus{outline:none;background:var(--card);border-color:var(--link);box-shadow:0 0 0 3px rgba(29,79,145,.14)}
.search .kb{position:absolute;right:10px;top:50%;transform:translateY(-50%)}.search input:focus~.kb{display:none}
.ib{display:none;width:40px;height:40px;border:0;background:none;border-radius:8px;cursor:pointer;place-items:center;color:var(--ink)}
.ib:hover,.ib[aria-expanded="true"]{background:var(--soft)}
.ib svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
.results{position:absolute;top:calc(100% + 6px);right:0;width:min(460px,calc(100vw - 24px));max-height:min(70vh,520px);overflow:auto;background:var(--card);border:1px solid var(--line);border-radius:10px;box-shadow:0 16px 40px rgba(0,0,0,.14);padding:6px}
.res{display:block;padding:8px 10px;border-radius:7px;color:var(--ink);text-decoration:none;font-size:14.5px;line-height:1.4}
.res small{display:block;color:var(--mut);font-size:12.5px}.res .pill{margin-right:6px}
.res:hover,.res[aria-selected="true"]{background:var(--soft)}
.res-empty{padding:12px;color:var(--mut);font-size:14px}

/* ---------- type ---------- */
h1,h2,.h1s{color:var(--ink)}
.kicker{margin:0 0 10px;font-size:13px;font-weight:600;letter-spacing:.02em;color:var(--mut)}
h1{font:700 clamp(32px,5vw,52px)/1.06 var(--serif);letter-spacing:-.02em;margin:0 0 18px;max-width:18ch}
.h1s{font:700 clamp(24px,3.4vw,34px)/1.15 var(--serif);letter-spacing:-.01em;margin:0 0 12px;max-width:none}
.h1s.small{font-size:22px;margin-top:14px}
h2{font:700 24px/1.2 var(--serif);margin:0}
.standfirst{font-size:clamp(17px,2vw,20px);line-height:1.5;color:var(--body);max-width:62ch;margin:0 0 14px}
.standfirst b{color:var(--ink)}
.byline{font-size:14px;color:var(--mut);margin:0}
.sub{color:var(--mut);margin:6px 0 18px;max-width:70ch}
.note{color:var(--mut);font-size:13.5px;margin:12px 0 0;max-width:80ch}
.aside{color:var(--mut);font-size:15px;margin:0 0 6px}
.back{display:inline-block;font-size:14.5px;text-decoration:none;margin:-6px 0 8px;padding:6px 0}.back:hover{text-decoration:underline}
.more{font-size:14.5px}

/* ---------- blocks ---------- */
.hero{padding:32px 20px 8px}
.block{padding-top:56px}.block.first,.prose.first{padding-top:44px}
.head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:2px solid var(--ink);padding-top:12px}
.tag{display:inline-block;font:700 11px/1.6 var(--sans);letter-spacing:.05em;text-transform:uppercase;padding:0 6px;border-radius:4px;vertical-align:.18em;white-space:nowrap}
.tag.cn{background:var(--ink);color:#fff}.tag.gl{box-shadow:inset 0 0 0 1px var(--faint);color:var(--mut)}
.pill{display:inline-block;font:700 12px/1.7 var(--sans);padding:0 9px;border-radius:999px;white-space:nowrap;vertical-align:.08em}
.pill.VERBATIM{background:var(--v);color:#fff}.pill.PARTIAL{background:var(--p);color:#1a1300}.pill.REFRESH{background:var(--r);color:#fff}.pill.NEW{background:#dff0e3;color:#24603a}.pill.CHECK_ANSWER{background:var(--soft);color:var(--mut);box-shadow:inset 0 0 0 1px var(--line)}

/* chart */
.legend{display:flex;flex-wrap:wrap;align-items:center;gap:6px 16px;font-size:13.5px;color:var(--mut);margin:14px 0 0}
.legend i{display:inline-block;width:11px;height:11px;border-radius:2px;margin-right:6px;vertical-align:-1px}.legend .vb{background:var(--v)}.legend .pb{background:var(--p)}
.legend .tag{margin-right:4px;vertical-align:.1em}.legend .sep{width:1px;height:16px;background:var(--line)}.legend .hint{color:var(--ink);font-weight:600}
.charts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-top:16px}
.chart{margin:0;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px 14px;--ph:300px}
.chart figcaption{font:700 17px var(--sans);color:var(--ink);margin-bottom:14px}
.plot{position:relative;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin-left:30px}
.glines{position:absolute;left:0;right:0;top:0;height:var(--ph);pointer-events:none}
.glines span{position:absolute;left:0;right:0;border-top:1px dashed var(--line)}
.glines em{position:absolute;left:-32px;top:-8px;font:500 11px var(--sans);color:var(--faint);font-style:normal}
.col{position:relative;display:flex;flex-direction:column;min-width:0}
.col .pair{display:flex;justify-content:center;align-items:flex-end;gap:8px;height:var(--ph);border-bottom:1.5px solid var(--ink)}
.bar{position:relative;width:min(54px,42%);height:100%;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;border:0;padding:0;background:none;font:inherit}
button.bar{cursor:pointer}
.bar .f{width:100%;display:flex;flex-direction:column-reverse;border-radius:4px 4px 0 0;overflow:hidden;min-height:2px;transition:filter .12s}
.bar .f i{display:block;width:100%}.bar .f .vb{background:var(--v)}.bar .f .pb{background:var(--p)}
.bar.gl .f{opacity:.45}
button.bar:hover .f{filter:brightness(.9) saturate(1.1)}button.bar.sel .f{box-shadow:0 0 0 2px var(--card),0 0 0 4px var(--ink);overflow:visible}
.bar .v{font:700 15px var(--sans);color:var(--ink);margin-bottom:5px;white-space:nowrap}
.bar.gl .v{font-weight:600;color:var(--mut);font-size:13.5px}
.bar.none .v{font:400 11.5px/1.25 var(--sans);color:var(--faint);white-space:normal;text-align:center}
.bar .tg{position:absolute;top:calc(100% + 6px);left:50%;transform:translateX(-50%)}
.bar .tg .tag{font-size:9.5px;padding:0 4px}
.col .x{text-align:center;font-size:13.5px;font-weight:700;color:var(--ink);padding-top:32px}
.col .x small{display:block;font-weight:400;color:var(--mut);font-size:11.5px}.col .x small span{display:inline-block;white-space:nowrap}

/* pop-up beside a clicked bar */
.pop{position:absolute;z-index:40;width:min(350px,calc(100vw - 24px));max-height:calc(100vh - 90px);overflow:auto;background:var(--card);border:1px solid var(--line);border-radius:10px;box-shadow:0 18px 44px rgba(0,0,0,.16);padding:6px 6px 8px;animation:pin .14s ease-out}
.pop.inline{position:static;width:auto;max-height:none;margin:-4px 0 4px;box-shadow:0 6px 20px rgba(0,0,0,.08)}
@keyframes pin{from{opacity:0;transform:translateY(4px)}}
.pop-h{display:flex;align-items:center;gap:8px;padding:6px 8px 2px;font-size:15px;color:var(--ink)}
.pop-h .x{margin-left:auto;border:0;background:none;cursor:pointer;color:var(--mut);font-size:14px;padding:3px 7px;border-radius:6px}.pop-h .x:hover{background:var(--soft)}
.pop-sum{margin:0 8px 6px;font-size:13.5px;color:var(--mut)}.pop-sum b{color:var(--ink)}
button.prow{width:100%;border:0;background:none;text-align:left;font:inherit;cursor:pointer}
.prow.sel{background:var(--soft);box-shadow:inset 3px 0 0 var(--ink)}
.prow{display:grid;grid-template-columns:52px 1fr 44px 62px 14px;gap:8px;align-items:center;padding:8px;border-radius:7px;text-decoration:none;color:var(--ink);font-size:14px}
.prow:hover,.prow:focus-visible{background:var(--soft)}
.prow .u{font-weight:600}.prow b{text-align:right}.prow .mk{color:var(--faint);font-size:12.5px;text-align:right}
.prow .mbar{height:8px;background:var(--soft);border-radius:2px;overflow:hidden}.prow .mbar i{display:block;height:100%;background:var(--v)}.prow .mbar i.gl{background:#b9b7b1}
.prow.off{color:var(--faint)}.prow .same{grid-column:2/5;font-size:13px}
.prow .go{color:var(--faint);font-size:18px;line-height:1}

.pop .tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:5px;margin:4px 8px 8px}
.tile{display:flex;flex-direction:column;align-items:center;justify-content:center;height:44px;border-radius:6px;text-decoration:none;font:700 14px/1 var(--sans);color:#fff;gap:3px}
.tile small{font:500 10px var(--sans);opacity:.85}
a.tile:hover{outline:2px solid var(--ink);outline-offset:1px}
.tile.VERBATIM{background:var(--v)}.tile.PARTIAL{background:var(--p);color:#1a1300}.tile.REFRESH{background:var(--r)}
.tile.NEW{background:var(--n);color:#1f4d2e}.tile.CHECK_ANSWER{background:var(--soft);color:var(--mut)}
.pop .key{margin:0 8px 8px;font-size:12px}
.clist{border-top:1px solid var(--line);margin:0 2px;padding-top:4px;max-height:220px;overflow:auto}
.crow{display:flex;align-items:center;gap:8px;padding:6px;border-radius:6px;text-decoration:none;color:var(--ink);font-size:13.5px}
.crow:hover,.crow:focus-visible{background:var(--soft)}.crow span{flex:1;min-width:0}.crow .m{font-size:14px}.crow .m small{color:var(--faint);font-weight:500}
.crow .pill{font-size:10.5px}
.pop-more{display:block;margin:6px 8px 2px;font-size:13.5px;font-weight:600}

/* phones: panels in a bottom sheet over the page */
#sheet{position:fixed;inset:0;z-index:60;pointer-events:none}
#sheet.on{pointer-events:auto}
.sh-back{position:absolute;inset:0;background:rgba(17,17,17,.38);opacity:0;transition:opacity .2s}
#sheet.on .sh-back{opacity:1}
.sh-box{position:absolute;left:0;right:0;bottom:0;max-height:84vh;max-height:84dvh;overflow:auto;overscroll-behavior:contain;background:var(--card);border-radius:16px 16px 0 0;box-shadow:0 -10px 40px rgba(0,0,0,.2);padding:6px 6px max(18px,env(safe-area-inset-bottom));transform:translateY(100%);transition:transform .24s cubic-bezier(.2,.8,.2,1)}
#sheet.on .sh-box{transform:none}
.sh-box::before{content:"";display:block;width:40px;height:4px;border-radius:2px;background:#d3d0c8;margin:4px auto 6px}
.sh-box .pop{position:static;width:auto;max-height:none;overflow:visible;border:0;box-shadow:none;padding:0;animation:none}
.sh-up{flex:none;width:34px;height:34px;margin-right:2px;border:0;border-radius:8px;background:var(--soft);font-size:20px;line-height:1;cursor:pointer;color:var(--ink)}
.sh-box .pop-h{position:sticky;top:-6px;z-index:1;background:var(--card);padding-top:8px;padding-bottom:8px}
.sh-box .pop-h .x{width:34px;height:34px;font-size:16px}
html.sheet-open{overflow:hidden}
@media (prefers-reduced-motion:reduce){.sh-box,.sh-back{transition:none}}

/* the unit panel a grid square opens */
.pop.upop{width:min(440px,calc(100vw - 24px))}
.upapers{margin:4px 8px 4px}
.upaper{padding:8px 0}.upaper+.upaper{border-top:1px solid var(--line)}
.uph{display:flex;align-items:baseline;gap:8px;margin-bottom:6px;font-size:13.5px}
.uph .code{color:var(--mut)}.uph b{margin-left:auto;font-size:18px;color:var(--mut)}.uph b.cn{color:var(--v)}.uph .mk{font-size:12.5px;color:var(--mut);min-width:84px;text-align:right}
.upaper.none-p{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--mut)}
.mstrip{display:flex;gap:2px;height:22px}
.blk.VERBATIM{background:var(--v)}.blk.REFRESH{background:var(--r)}.blk.NEW,.blk.CHECK_ANSWER{background:var(--n)}
.blk.PARTIAL{background:linear-gradient(90deg,var(--p) calc(100% - var(--new)),#f3dfb4 0)}
.mstrip .blk{display:block;height:100%;min-width:3px;border-radius:2px}
.mstrip a.blk:hover{outline:2px solid var(--ink);outline-offset:1px}
.upapers .key{margin:6px 0 0}
.usrc,.uprog{margin:8px 8px 0;padding-top:8px;border-top:1px solid var(--line)}
.usrc h4,.uprog h4{margin:0 0 4px;font:600 12.5px var(--sans);color:var(--mut)}
.usrc .more{margin:2px 0 0;font-size:12.5px;color:var(--mut)}
.steps{display:grid;grid-template-columns:repeat(4,1fr);margin-top:4px}
.ustep{display:flex;flex-direction:column;align-items:stretch;gap:3px;padding:6px 4px 5px;border:0;border-radius:8px;background:none;cursor:pointer;font:inherit;color:var(--ink);line-height:1.2;text-align:center}
.ustep b{font-size:14px}.ustep small{font-size:11.5px;color:var(--mut)}
.ustep .ub{position:relative;display:flex;align-items:flex-end;justify-content:center;height:40px;margin:0 -4px;border-bottom:1.5px solid #c9c6be}
.ustep .ub i{display:block;width:42%;background:var(--v);opacity:.45;border-radius:2px 2px 0 0}
.ustep:last-child .ub::after{content:"";position:absolute;right:-1px;bottom:-5.25px;border-left:8px solid #c9c6be;border-top:4.5px solid transparent;border-bottom:4.5px solid transparent}
.ustep:hover:not(:disabled){background:var(--soft)}
.ustep.on{background:var(--soft);box-shadow:inset 0 0 0 1.5px var(--ink)}.ustep.on .ub i{opacity:1}.ustep.on small{color:var(--ink);font-weight:600}
.ustep.na b{font-size:12px;font-weight:500;color:var(--faint)}
.ustep:disabled{cursor:default}
.ufoot{margin:12px 2px 0;padding:12px 10px 10px;background:var(--soft);border-radius:10px}
.ucmp{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.ucmp .btn{justify-content:center;padding:10px 8px;text-decoration:none;font-size:14px}.ucmp .btn:only-child{grid-column:1/-1}
.btn.primary{background:var(--ink);border-color:var(--ink);color:#fff;font-weight:600}.btn.primary:hover{background:#000}
.udl{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}
.udl-h{grid-column:1/-1;margin:0;font:600 12.5px var(--sans);color:var(--mut)}
.dlt{display:flex;align-items:center;gap:9px;min-width:0;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:var(--card);text-decoration:none;color:var(--ink)}
.dlt:hover{border-color:var(--ink)}
.dlt svg{flex:none;width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.dlt b{display:block;font-size:13.5px}.dlt small{display:block;font-size:12px;color:var(--mut);white-space:nowrap}
.udl-n{grid-column:1/-1;margin:0;font-size:12px;color:var(--mut)}
@media (max-width:380px){.ucmp{grid-template-columns:1fr}.udl{gap:6px}.dlt{gap:6px;padding:8px 7px}.dlt svg{width:16px;height:16px}.dlt b{font-size:12.5px;white-space:nowrap}.dlt small{font-size:11.5px}}
@media (max-width:330px){.udl{grid-template-columns:1fr}}
.pdfl{margin:10px 8px 4px;padding:8px 10px 6px;border:1px dashed #d3d0c8;border-radius:8px}
.pdfh{margin:0 0 4px;font:600 12.5px var(--sans);color:var(--mut)}
.pdfrow{display:flex;align-items:center;gap:10px;padding:6px;margin:0 -6px;border-radius:6px;text-decoration:none;color:var(--ink)}
.pdfrow:hover{background:var(--soft)}
.pdfrow svg{flex:none;width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.pdfrow b{display:block;font-size:13.5px}.pdfrow small{display:block;font-size:12px;color:var(--mut)}
.pdfn{margin:4px 0 0;font-size:12px;color:var(--mut)}
.pv-head{display:grid;grid-template-columns:minmax(0,1fr) 340px;column-gap:40px;align-items:start}
.pv-head>*{grid-column:1}.pv-head .pv-dl{grid-column:2;grid-row:2/span 3;margin-top:4px}
.pv-dl .pdfl{margin:0}
details.pdfl>summary{cursor:pointer;list-style:none}details.pdfl>summary::-webkit-details-marker{display:none}
details.pdfl>summary::after{content:" ▾";color:var(--faint)}details.pdfl[open]>summary::after{content:" ▴"}
.aside.define{max-width:62ch;margin:0 0 12px}
.key-sm{font-size:12.5px;color:var(--mut);margin:-8px 0 14px}
.cell .sm{display:none}
.col .x small .x-new{color:var(--v);font-weight:600}
.prose>.dlrow{max-width:none}

/* paper grid */
.grids{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.pgrid{border-collapse:separate;border-spacing:4px;width:100%;table-layout:fixed}
.pgrid caption{text-align:left;font:700 15px var(--sans);color:var(--ink);padding:0 4px 4px}
.pgrid th{font-size:12.5px;font-weight:600;color:var(--mut);text-align:center;padding:2px}
.pgrid thead th:first-child,.pgrid tbody th,.pgrid tfoot th{width:58px;text-align:left}
.pgrid tbody th{font-size:13.5px;color:var(--ink)}
.pgrid .tl th{position:relative;padding:0 0 16px;vertical-align:bottom}
.pgrid{margin-right:12px}
.pgrid .tl th:not(:first-child)::before{content:"";position:absolute;left:-4px;right:-4px;bottom:6px;height:2px;background:var(--ink)}
.pgrid .tl th:nth-child(2)::before{left:50%}
.pgrid .tl th:not(:first-child)::after{content:"";position:absolute;left:50%;bottom:3px;width:8px;height:8px;margin-left:-4px;border-radius:50%;background:var(--ink)}
.pgrid .tl th.last::before{right:-6px}
.pgrid .tl th.last .lab::after{content:"";position:absolute;right:-14px;bottom:1px;border:6px solid transparent;border-left:10px solid var(--ink)}
.pgrid .tl .lab{display:block;font-size:12px;font-weight:600;color:var(--mut);line-height:1.15}
.pgrid .tl .lab b{display:block;font-size:13px;color:var(--ink)}
.pgrid td{padding:0}
.cell{display:flex;flex-direction:column;justify-content:center;align-items:center;height:62px;border-radius:6px;text-decoration:none;color:var(--ink);box-shadow:inset 0 0 0 1px rgba(0,0,0,.06);transition:transform .08s}
button.cell{width:100%;border:0;font:inherit;cursor:pointer}
button.cell:hover{transform:translateY(-1px);box-shadow:inset 0 0 0 2px var(--ink)}
button.cell.sel{box-shadow:0 0 0 2px var(--bg),0 0 0 4px var(--ink)}
.cell b{font-size:18px;line-height:1.1}
.cell small{font-size:11px;opacity:.85}
.cell.blank{background:var(--card);color:var(--faint)}.cell.blank span{font-size:11.5px;text-align:center;line-height:1.2;padding:0 4px}
.pgrid tfoot td{text-align:center;font-weight:700;font-size:14px;color:var(--ink);padding-top:6px;border-top:1px solid var(--line)}
.pgrid tfoot th{font-size:12.5px;color:var(--mut);padding-top:6px;border-top:1px solid var(--line)}

/* the paper view: a whole paper, every question beside the earlier one */
.pv-head{padding-top:28px;padding-bottom:18px}
.pv-head .h1s{margin-bottom:10px}
.pv-head .aside{margin:0;font-size:14.5px}
.pv-nav{position:sticky;top:61px;z-index:20;background:rgba(250,250,247,.96);backdrop-filter:blur(8px);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.pv-nav .pv-nav-in{padding-top:14px;padding-bottom:8px}
.strip{display:flex;height:40px;gap:2px}
.blk-b{position:relative;display:block;height:100%;min-width:4px;padding:0;border:0;background:none;cursor:pointer}
.blk-b .blk{position:absolute;inset:0 0 15px 0;border-radius:2px}
.blk-b:hover .blk{inset:-2px 0 13px 0}
.blk-b.cur .blk{box-shadow:0 0 0 2px var(--bg),0 0 0 4px var(--ink)}
.blk-b .ql{position:absolute;left:0;right:0;bottom:0;font-size:11px;font-weight:600;color:var(--mut);text-align:center;line-height:13px}
.blk-b.cur .ql{color:var(--ink)}.blk-b.nolab .ql{visibility:hidden}.blk-b.cur.nolab .ql{visibility:visible}
.blk.VERBATIM{background:var(--v)}.blk.REFRESH{background:var(--r)}.blk.NEW,.blk.CHECK_ANSWER{background:var(--n)}
.blk.PARTIAL{background:linear-gradient(90deg,var(--p) calc(100% - var(--new)),#f3dfb4 0)}
.pv-tools{display:flex;align-items:center;gap:8px 18px;flex-wrap:wrap;margin-top:6px;font-size:13.5px;color:var(--mut)}
.pv-tools .pos{min-width:120px;color:var(--mut)}.pv-tools .pos b{color:var(--ink)}
.pv-tools .key{margin:0}
.pv-tools .only{display:inline-flex;align-items:center;gap:6px;cursor:pointer;color:var(--ink);font-weight:600}
.pv-tools .only input{width:16px;height:16px;margin:0;accent-color:var(--ink)}
.step{display:flex;gap:4px;margin-left:auto}.step .btn{width:36px;height:32px;justify-content:center;padding:0;font-size:18px}
.key{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:13px;color:var(--mut)}
.key i{display:inline-block;width:11px;height:11px;border-radius:2px;margin-right:6px;vertical-align:-1px}
.key .VERBATIM{background:var(--v)}.key .PARTIAL{background:var(--p)}.key .REFRESH{background:var(--r)}.key .NEW{background:var(--n)}
.pv-body{padding-top:8px}
.qs{scroll-margin-top:168px;padding:26px 0 30px;border-bottom:1px solid var(--line)}
.pv.only .qs.NEW{display:none}
.qs-ms{display:none;grid-template-columns:1fr 1fr;gap:24px;align-items:start;margin-top:18px;padding-top:14px;border-top:1px dashed #d3d0c8}
.pv.ms-on .qs-ms{display:grid}
.qs-ms figure{margin:0;min-width:0}
.qs-ms figcaption{font-size:13.5px;color:var(--mut);margin-bottom:8px}.qs-ms figcaption b{font-size:12px;color:var(--ink);text-transform:uppercase;letter-spacing:.04em;margin-right:6px}
.ms-none{margin:0;padding:14px;border:1px dashed var(--line);border-radius:6px;color:var(--mut);font-size:14px}
.pos .sm{display:none}
.qs-h{display:flex;align-items:center;gap:8px 12px;flex-wrap:wrap;margin-bottom:14px}
.qs-h h2{font:700 21px/1.2 var(--serif);margin:0}.qs-h h2 small{font:500 14px var(--sans);color:var(--mut);margin-left:4px}
.qs-m{font-size:14.5px;color:var(--body)}.qs-m b{color:var(--ink)}
.qs-ev{font-size:13px;color:var(--mut)}
.qs-parts{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 14px;margin:-4px 0 16px;font-size:13px;color:var(--mut)}
.qs-parts-h{color:var(--body)}
.pp{white-space:nowrap}.pp b{color:var(--ink);font-weight:600}
.pp i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:5px;vertical-align:-1px}
.pp.VERBATIM i{background:var(--v)}.pp.PARTIAL i{background:var(--p)}.pp.REFRESH i{background:var(--r)}.pp.NEW i{background:var(--n)}
.qs-link{margin-left:auto;width:34px;height:34px;display:grid;place-items:center;border:1px solid transparent;border-radius:8px;background:none;color:var(--mut);cursor:pointer}
.qs-link:hover{border-color:var(--line);background:var(--card);color:var(--ink)}
.qs-link svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round}
.qs-cols{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}
.qs-cols figure{margin:0;min-width:0}
.qs-cols figcaption{display:flex;align-items:baseline;gap:6px;flex-wrap:wrap;font-size:13.5px;color:var(--mut);margin-bottom:8px}
.qs-cols figcaption b{font-size:12px;font-weight:700;color:var(--ink);text-transform:uppercase;letter-spacing:.04em}
.qs-cols figcaption small{margin-left:auto;color:var(--faint)}
.scan{background:#fff;border:1px solid var(--line);border-radius:4px;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.scan+.scan{margin-top:8px}
.scan img{display:block;width:100%;height:auto;border-radius:4px;background:var(--soft)}  /* grey, not blank white, while a page is still arriving */
.qs-none{margin-top:29px;padding:22px 20px;border:1px dashed #d3d0c8;border-radius:6px;color:var(--mut);font-size:14.5px;display:flex;flex-direction:column;gap:4px}
.qs-none b{color:var(--ink);font-size:15px}
.qs.slim{padding:14px 0}.qs.slim p{margin:0;font-size:15px;color:var(--mut)}.qs.slim p b{color:var(--ink)}.qs.slim .pill{margin:0 4px}
.imgerr{color:var(--v);font-size:14px;padding:12px;border:1px dashed var(--line);border-radius:6px}
.btn{display:inline-flex;align-items:center;gap:6px;padding:7px 13px;border:1px solid var(--line);border-radius:8px;background:var(--card);cursor:pointer;font-size:14px;color:var(--ink)}
.btn:hover{border-color:var(--ink)}.btn:disabled{opacity:.35;cursor:default}
.pager{display:flex;align-items:center;gap:8px}.pager .pos{color:var(--mut);font-size:13.5px}

/* text pages */
.prose>*{max-width:760px}
.prose h2{font-size:21px;margin:34px 0 8px}
.prose p{margin:0 0 14px;font-size:16.5px;line-height:1.65}
.rules{display:grid;grid-template-columns:auto 1fr;gap:12px 16px;margin:12px 0}.rules dt{padding-top:2px}.rules dd{margin:0}
table.plain{border-collapse:collapse;width:100%;font-size:14.5px;margin:10px 0}
.plain th{text-align:right;font-size:12.5px;color:var(--mut);font-weight:600;padding:6px 8px;border-bottom:2px solid var(--ink)}
.plain td{text-align:right;padding:7px 8px;border-bottom:1px solid var(--line)}
.plain th:first-child,.plain td:first-child{text-align:left}
.todo{background:#fff3c4;padding:1px 4px;border-radius:3px}
.prose h3{font:700 15px var(--sans);color:var(--ink);margin:22px 0 6px}
.dlrow{display:grid;grid-template-columns:120px 1fr;gap:10px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}
.dlrow .when{font-size:14.5px;font-weight:600;color:var(--ink)}
.dlrow .units{display:flex;flex-wrap:wrap;gap:6px}
.unit{display:flex;flex-direction:column;gap:2px;min-width:132px;padding:7px 11px;border:1px solid var(--line);border-radius:8px;background:var(--card);line-height:1.3}
.unit b{font-size:14.5px;color:var(--ink)}.unit b small{font-weight:500;font-size:12px;color:var(--mut);margin-left:4px}
.unit a{font-size:13px;text-decoration:none}.unit a::before{content:"↓ ";color:var(--faint)}.unit a:hover{text-decoration:underline}
.dl{display:flex;align-items:center;gap:14px;padding:14px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.dl:hover b{text-decoration:underline}
.dl .ic{flex:none;width:44px;height:44px;border-radius:8px;background:var(--soft);display:grid;place-items:center;font:700 11px var(--sans);color:var(--mut)}
.dl b{display:block;font-weight:600}.dl small{color:var(--mut);font-size:14px}

/* footer */
.foot{margin-top:80px;border-top:1px solid var(--line);background:var(--card)}
.foot-in{display:flex;justify-content:space-between;gap:12px 32px;flex-wrap:wrap;padding-top:22px;padding-bottom:28px;font-size:13.5px;color:var(--mut)}
.foot p{margin:0;max-width:70ch}.foot nav{display:flex;gap:18px}.foot a{color:var(--mut)}

.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(20px);opacity:0;z-index:80;background:var(--ink);color:#fff;padding:9px 15px;border-radius:8px;font-size:14px;transition:opacity .18s ease,transform .18s cubic-bezier(.23,1,.32,1);pointer-events:none}
.toast.on{opacity:1;transform:translateX(-50%)}

/* method: the algorithm */
ol.algo{padding-left:22px;margin:8px 0 14px}ol.algo li{margin:0 0 10px;font-size:16px;line-height:1.6}ol.algo li b{color:var(--ink)}

/* review (local only) */
.review .qs-ms{display:grid}
.mine{margin:4px auto 10px;font-size:14px;color:var(--mut)}.mine b{color:var(--ink)}
.review{padding-bottom:110px}
.rhead{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding-top:14px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.prog{font-size:14px;color:var(--mut)}.prog b{color:var(--ink)}
.rhead .pager{margin-left:auto}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}.seg button{border:0;background:var(--card);padding:6px 11px;font-size:13.5px;cursor:pointer;color:var(--mut)}.seg button.on{background:var(--ink);color:#fff}
.saved{font-size:12.5px;color:var(--mut)}.saved.bad{color:var(--v);font-weight:600}
.why{color:#9a6a00;font-weight:600;font-size:14px}
.decide{position:fixed;left:0;right:0;bottom:0;z-index:20;background:var(--card);border-top:1px solid var(--line);box-shadow:0 -6px 20px rgba(0,0,0,.05)}
.decide-in{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding-top:10px;padding-bottom:10px}
.vbtn{border:1px solid var(--line);background:var(--card);border-radius:8px;padding:7px 12px;font-size:14px;font-weight:600;cursor:pointer;display:inline-flex;gap:8px;align-items:center}
.vbtn kbd{border:0;background:var(--soft)}
.vbtn.on.VERBATIM{background:var(--v);border-color:var(--v);color:#fff}.vbtn.on.PARTIAL{background:var(--p);border-color:var(--p)}
.vbtn.on.REFRESH{background:var(--r);border-color:var(--r);color:#fff}.vbtn.on.NEW{background:#4d8a62;border-color:#4d8a62;color:#fff}
.decide input{font:inherit;font-size:14px;padding:7px 10px;border:1px solid var(--line);border-radius:8px;background:var(--bg)}
.decide .mk{width:96px}.decide .nt{flex:1;min-width:180px}

/* ---------- narrow screens ---------- */
@media (max-width:1000px){  /* search folds into a button that opens a full-width field */
  #searchBtn{display:grid;margin-left:auto}
  .search{display:none}
  .top.search-open .search{display:block;position:absolute;left:0;right:0;top:100%;width:auto;margin:0;padding:8px max(12px,calc((100vw - var(--w))/2 + 20px)) 10px;background:var(--card);border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(0,0,0,.08)}
  .top.search-open .search svg{left:calc(max(12px,calc((100vw - var(--w))/2 + 20px)) + 11px);margin-top:-1px}
  .search input{font-size:16px}.search .kb{display:none}
  .results{left:12px;right:12px;width:auto}
  .pv-head{display:block}.pv-head .pv-dl{margin:6px 0 12px;max-width:520px}
}
@media (max-width:900px){
  .charts,.grids{grid-template-columns:1fr}
  .qs-cols{grid-template-columns:1fr;gap:18px}
  .qs-none{margin-top:0}
}
@media (max-width:720px){
  .top-in{height:54px;gap:2px}
  .brand{margin-right:auto;font-size:15.5px}
  .links{display:none}
  .top.menu-open .links{display:flex;flex-direction:column;position:absolute;left:0;right:0;top:100%;background:var(--card);border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(0,0,0,.08);padding:6px 8px 10px;gap:0}
  .top.menu-open .links a{padding:12px;font-size:16px;border-radius:8px}.top.menu-open .links a::after{display:none}
  .top.menu-open .links a.on{background:var(--soft)}
  #menuBtn{display:grid}
  .pv-nav{top:55px}
  .pv-tools .key,.only .lg,.pos .lg{display:none}.pos .sm{display:inline}
  .qs-ms{grid-template-columns:1fr;gap:16px}
  .pv-tools{flex-wrap:nowrap;gap:12px;margin-top:4px}.pv-tools .pos{min-width:0}
  .pv-nav .pv-nav-in{padding-top:12px;padding-bottom:6px}
  .strip{height:32px}
  .qs{scroll-margin-top:158px;padding:20px 0 24px;position:relative}
  .qs-h{padding-right:40px}.qs-link{position:absolute;right:-6px;top:16px}
  .wrap{padding:0 16px}
  .hero{padding:36px 16px 0}
  .block{padding-top:44px}
  .chart{--ph:230px;padding:14px 10px 12px}
  .plot{margin-left:26px}.glines em{left:-27px;font-size:10px}
  .col .pair{gap:4px}.bar{width:44%}
  .bar .v{font-size:12.5px}.bar.gl .v{font-size:11px}.bar.none .v{font-size:10px}
  .bar .tg .tag{font-size:8px;padding:0 3px;letter-spacing:.02em}
  .col .x{font-size:12.5px}.col .x small{font-size:10.5px;line-height:1.25}
  .legend{font-size:13px;gap:6px 12px}.legend .sep{display:none}
  .dlrow{grid-template-columns:1fr;gap:6px}.unit{min-width:0;flex:1 1 30%}
  .cell{height:54px}.cell b{font-size:16px}.cell small{font-size:10.5px}
  .cell .lg{display:none}.cell .sm{display:inline;font-size:15px;font-weight:600}
  .pgrid{border-spacing:3px}.pgrid thead th:first-child,.pgrid tbody th,.pgrid tfoot th{width:44px}.pgrid th{font-size:11px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* UI audit refinements: preserve the editorial palette and evidence-first layout. */
:root{--refresh-label:#596577;--ease-out:cubic-bezier(.23,1,.32,1)}
html{scroll-padding-top:76px}
body{min-height:100dvh}
button,a,input,select,summary{touch-action:manipulation;-webkit-tap-highlight-color:rgba(29,79,145,.12)}
input{caret-color:var(--link)}
::selection{background:#dce7f5;color:var(--ink)}
h1,h2{text-wrap:balance}
h1[tabindex="-1"]:focus{outline:none}
.brand{min-width:0;min-height:44px}
.bt{min-width:0}
.search{min-width:180px}
.results,.pop{overscroll-behavior:contain;scrollbar-width:thin}
.res{min-height:44px}
.res b,.res small,.pop-h b{overflow-wrap:anywhere}
.pop{animation-timing-function:var(--ease-out)}
.keyboard-input .pop{animation:none}
.pop-h{align-items:center}
.pop-h b{padding-top:0}
.pop-h .x{flex:none;min-width:44px;min-height:44px;padding:8px}
.pop:focus{outline:none}
.pop:focus-visible,h1[tabindex="-1"]:focus-visible{outline:2px solid var(--link);outline-offset:3px}
.pill.REFRESH,.tile.REFRESH{background:var(--refresh-label)}
.cell small{opacity:1}
.col .x small .x-new{color:var(--mut);font-weight:500}
.table-scroll{max-width:100%;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:thin}
.table-scroll .plain{min-width:440px}
.rules{align-items:start}
.rules dd{min-width:0}
.prose li{margin-bottom:8px}
.prose p,.prose li{overflow-wrap:anywhere}
.question-jump{display:none}
.pv-tools .only{min-height:44px}
.btn{transition:border-color .12s ease,background-color .12s ease,transform .12s var(--ease-out)}
.btn:active:not(:disabled){transform:scale(.97)}
.btn:disabled{opacity:1;color:var(--mut);background:var(--soft);border-color:var(--line)}
.qs-link{width:44px;height:44px}
.foot nav{flex-wrap:wrap;gap:4px 18px}
.foot nav a{display:inline-flex;align-items:center;min-height:44px}
.toast{max-width:calc(100vw - 32px);width:max-content;bottom:max(24px,env(safe-area-inset-bottom))}
@media (hover:none){
  button.cell:hover{transform:none}
  .blk-b:hover .blk{inset:0 0 15px}
}
@media (max-width:720px){
  .ib{width:44px;height:44px;flex:none}
  .brand{font-size:clamp(13px,3.9vw,15.5px);gap:8px;white-space:normal;line-height:1.2}
  .search{min-width:0}
  .pv-tools{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:0 8px}
  .pv-tools .pos{display:none}
  .question-jump{display:block;min-width:0}
  .question-jump select{width:100%;min-height:44px;padding:6px 28px 6px 10px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);font:500 16px var(--sans);text-overflow:ellipsis}
  .step .btn{width:44px;height:44px}
  .pv-tools .only{order:2;font-size:13px}
  .pv-tools .step{margin-left:0}
  .qs{scroll-margin-top:218px}
  .sh-box .pop-h .x,.sh-up{width:44px;height:44px}
  .crow,.pdfrow,.dlt{min-height:44px}
  .uph{flex-wrap:wrap}
  .uph .mk{min-width:0}
  .rules{grid-template-columns:1fr;gap:6px}
  .rules dd{margin-bottom:14px}
  .foot{margin-top:56px}
}
@media (prefers-reduced-motion:reduce){
  .pop{animation:none}
  .btn:active:not(:disabled),button.cell:hover{transform:none}
}
@media (max-width:380px){
  .col .x small span{white-space:normal}
  .bar.gl .tg{top:calc(100% + 20px)}
  .col .x{padding-top:46px}
}

.start-here{margin-top:20px}
.start-here>div{display:flex;align-items:center;flex-wrap:wrap;gap:8px 20px}
.start-here .btn{min-height:44px;text-decoration:none;padding:9px 16px}
.start-here .browse-all{display:inline-flex;align-items:center;min-height:44px;font-size:14px}
.start-here p{font-size:13.5px;color:var(--mut);margin:7px 0 0}
.chart-change{font-size:13px;color:var(--mut);margin:14px 0 0;padding-top:10px;border-top:1px solid var(--line)}
.chart-change b{color:var(--ink)}
.evidence-summary{margin:0 0 16px;max-width:92ch}
.evidence-summary dl{display:grid;grid-template-columns:105px minmax(0,1fr);gap:5px 14px;margin:0;font-size:14px;line-height:1.55}
.evidence-summary dt{font-weight:600;color:var(--ink)}
.evidence-summary dd{margin:0;color:var(--mut);overflow-wrap:anywhere}
.qs-actions{display:flex;align-items:stretch;flex-wrap:wrap;gap:8px;margin:0 0 18px}
.qs-actions .btn{min-height:44px;text-decoration:none;flex-wrap:wrap;gap:3px 8px;text-align:left}
.file-info{font-size:12px;color:var(--mut)}
.copy-sheet{max-width:min(620px,calc(100vw - 32px));padding:24px;border:1px solid var(--line);border-radius:12px;background:var(--card);color:var(--ink)}
.copy-sheet::backdrop{background:rgba(17,17,17,.38)}
.copy-sheet p{font-size:14px;color:var(--mut)}
.copy-sheet textarea{width:100%;min-height:220px;font:14px/1.6 var(--sans);padding:12px;border:1px solid var(--line);border-radius:6px;color:var(--ink);background:var(--bg);margin-bottom:12px;resize:vertical}
@media(max-width:720px){
  .evidence-summary dl{grid-template-columns:1fr;gap:3px}
  .evidence-summary dd{margin-bottom:7px}
  .qs-actions{display:grid;grid-template-columns:1fr}
  .qs-actions .btn{justify-content:center}
}

/* Evidence hierarchy. */
.hero h1{max-width:24ch;font-size:clamp(34px,4.4vw,54px);line-height:1.08}
.hero .standfirst{max-width:68ch;font-size:clamp(17px,1.8vw,20px)}
.hero-actions{display:flex;flex-wrap:wrap;gap:4px 26px;margin:18px 0 12px}
.hero-actions a{display:inline-flex;align-items:center;gap:12px;min-height:44px;color:var(--ink);text-decoration:none;border-bottom:1px solid var(--ink);font-weight:600;font-size:15px}
.hero-actions a:hover{color:var(--link);border-color:var(--link)}
.hero-actions a span{font-weight:400}
#papers h2{scroll-margin-top:90px}
.tag{display:inline-flex;align-items:center;justify-content:center;line-height:1;min-height:20px;padding:3px 6px;vertical-align:middle;flex:none}
.pop-h{gap:8px;min-height:58px}
.pop-h>b{flex:1;line-height:1.3}
.pop-h>.tag{align-self:center}
.pop .pop-h .x{margin-left:0}
.pop{max-height:calc(100dvh - 90px);overflow-y:auto}
.pop-h{position:sticky;top:0;background:var(--card);z-index:2}
.pop-sum{margin-bottom:10px}
.uprog>summary{font-size:13px;font-weight:600;cursor:pointer;min-height:44px;display:flex;align-items:center;gap:8px}
.uprog>summary::before{content:'+';font-weight:400}.uprog[open]>summary::before{content:'−'}
.uprog .steps{padding-bottom:10px}
.paper-title{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:6px 0 12px}
.paper-title .h1s{margin:0}
.paper-title .tag{font-size:12px;min-height:25px;padding:5px 8px}
.paper-result{display:flex;align-items:center;gap:18px;max-width:650px}
.paper-result>strong{font:700 40px/1.1 var(--sans);letter-spacing:-.04em;color:var(--ink)}
.paper-result>span{font-size:15px;line-height:1.5;max-width:37ch;color:var(--mut)}
.paper-result>span>b{color:var(--ink)}
.paper-context{display:flex;align-items:baseline;gap:8px 22px;flex-wrap:wrap;margin:12px 0 0;font-size:13px;color:var(--mut)}
.paper-context .pdfl{margin:0;padding:0;border:0;border-radius:0;width:auto;max-width:100%;background:transparent}
.paper-context .pdfh{padding:0;min-height:36px;display:flex;align-items:center;font-size:13px;font-weight:600}
.paper-context .pdfl[open]{flex-basis:100%;max-width:600px}
.paper-context .pdfrow{padding:8px 0}
.paper-context .pdfn{font-size:12px;margin:4px 0}
.qs-h{margin-bottom:7px;gap:8px 12px}
.qs-h h2{font-size:23px}
.question-count{font-size:13px;color:var(--mut)}
.question-count b{color:var(--ink)}
.qs-parts{margin:0 0 6px;font-size:12px;gap:4px 12px}
.question-meta{display:flex;align-items:baseline;justify-content:space-between;gap:8px 18px;flex-wrap:wrap;margin:0 0 14px}
.question-meta .qs-ev{font-size:12px;max-width:75ch}
.qs-actions{display:block;margin:0;font-size:12px;position:relative;min-width:120px;text-align:right}
.qs-actions>summary{cursor:pointer;color:var(--link);min-height:32px;align-content:center}
.qs-actions>div{position:absolute;right:0;top:100%;min-width:220px;z-index:10;background:var(--card);padding:8px 14px;box-shadow:0 5px 20px #0002;border:1px solid var(--line);border-radius:6px;text-align:left}
.qs-actions a,.text-action{display:flex;align-items:center;flex-wrap:wrap;gap:4px 10px;min-height:40px;font:inherit;font-size:13px;color:var(--link);padding:4px 0;border:0;background:none;cursor:pointer}
.comparison-notes{display:grid;grid-template-columns:105px minmax(0,1fr);gap:5px 16px;font-size:14px;max-width:90ch;margin:8px 0 10px}
.comparison-notes dt{font-weight:600;color:var(--ink)}
.comparison-notes dd{margin:0;color:var(--mut)}
.qs-cols .comparison-caption{display:block;min-height:102px;margin:0 0 10px;padding:10px 0 0;border-top:3px solid var(--ink)}
.comparison-role{display:flex;align-items:center;gap:12px;min-height:28px}
.qs-cols .comparison-role>b{font:700 19px/1.2 var(--sans);text-transform:none;letter-spacing:-.015em;color:var(--ink)}
.comparison-identity{display:flex;align-items:baseline;flex-wrap:wrap;gap:4px 12px;margin:4px 0 0;line-height:1.4;font-size:13px}
.qs-cols .comparison-identity small{font-size:11px;margin-left:0}
.original-link{display:inline-flex;align-items:center;min-height:32px;font-size:11px;line-height:1.3;text-decoration:none;border-bottom:1px solid transparent;color:var(--link)}
.original-link:hover{text-decoration:underline}
.qs-none{margin-top:0;min-height:104px;border:0;border-top:3px solid var(--line);border-radius:0;background:transparent}
.method-lead{font-size:21px;color:var(--ink)}
.method-steps{padding-left:23px;list-style:decimal}
.method-steps li{padding-left:5px;margin:0 0 18px}
.method-example{border-left:3px solid var(--line);padding:4px 0 4px 16px;color:var(--mut);font-size:14px}
.method-example a{display:block;font-weight:600}
.method-detail{border-top:1px solid var(--line);padding:0 0 4px}
.method-detail:last-child{border-bottom:1px solid var(--line)}
.method-detail>summary{cursor:pointer;min-height:58px;align-content:center;font-size:17px;font-weight:600;color:var(--ink);padding:10px 0}
.method-detail[open]>summary{margin-bottom:4px}
.method-detail h2{font:600 16px/1.4 var(--sans);margin-top:18px}
.method-detail code{font-size:.85em;overflow-wrap:anywhere}
.method-detail p,.method-detail dd{font-size:15px}
.method-detail .rules{margin-top:8px}
.unit .tag{margin-left:6px}
@media(max-width:900px){
 .qs-cols .comparison-caption{min-height:0}
}
@media(max-width:720px){
 .hero{padding-top:30px}.hero h1{font-size:clamp(32px,7.8vw,44px);max-width:24ch}
 .hero-actions{gap:3px 18px}.hero-actions a{font-size:14px}
 .paper-title{gap:8px}.paper-title .h1s{font-size:27px}
 .paper-result>strong{font-size:34px}.paper-result{gap:14px}.paper-result>span{font-size:14px}
 .paper-context{gap:4px 16px}
 .question-meta{gap:0 10px;margin-bottom:8px;align-items:center}
 .question-meta .qs-ev{flex:1 1 190px}
 .qs-actions{display:block;min-width:0;margin:0;text-align:left}
 .qs-actions>summary{min-height:40px}
 .qs-actions>div{right:auto;left:0}
 .qs-h{padding-right:38px}.question-count{font-size:12px}
 .comparison-notes{grid-template-columns:1fr;gap:3px;font-size:13px}.comparison-notes dd{margin-bottom:6px}
 .qs-cols .comparison-role>b{font-size:20px}
 .original-link{min-height:36px;font-size:12px}
 .comparison-identity{font-size:12px}
 .method-detail>summary{font-size:16px}
}
@media print{
 .original-link,.qs-actions{display:none!important}
 .comparison-role b{font-size:16px!important}
}


.legend-help{position:relative;font-size:12px}
.legend-help>summary{cursor:pointer;min-height:36px;align-content:center}
.legend-help>.key{position:absolute;top:100%;left:0;min-width:150px;padding:10px 14px;background:var(--card);border:1px solid var(--line);box-shadow:0 5px 15px #0001;display:grid;gap:6px;z-index:5;border-radius:6px}
@media(min-width:760px) and (max-width:900px){.qs-cols{grid-template-columns:1fr 1fr;gap:20px}.qs-cols .comparison-caption{min-height:105px}}
@media(max-width:720px){.legend-help{grid-row:3;grid-column:1/-1}.legend-help>summary{min-height:32px}.pv-tools .legend-help>.key{display:grid;bottom:100%;top:auto}.qs{scroll-margin-top:238px}}
/* print: the paper as an evidence document, each question beside the earlier one */
@media print{
  @page{size:A4 landscape;margin:12mm}
  body{background:#fff}
  .top,.foot,.pv-nav,.back,.qs-link,.qs-actions,.toast,.decide,#sheet,.pop{display:none!important}
  .qs-cols{grid-template-columns:1fr 1fr!important;gap:14px}
  .qs{break-inside:avoid-page}
  .qs.NEW{display:none}
}

.pv-head{display:block}

.qs{scroll-margin-top:110px}
@media(max-width:720px){.qs{scroll-margin-top:168px}}
@media(max-width:720px){
 .pv-tools{grid-template-columns:minmax(0,1fr) auto auto;gap:0 8px}
 .question-jump{grid-column:1/3;grid-row:1}
 .pv-tools .step{grid-column:3;grid-row:1}
 .pv-tools .only{grid-row:2;grid-column:auto}
 .pv-tools .legend-help{grid-row:2;grid-column:3;justify-self:end}
 .legend-help>summary{min-height:44px}
 .legend-help>.key{left:auto;right:0}
 .qs{scroll-margin-top:136px}
}

/* Previews stay focused on the selected sitting or the China/Global pair. */
.pop{width:min(420px,calc(100vw - 24px))}
.pop[hidden]{display:none!important}
.pop-more{margin:12px 8px 4px;min-height:44px;display:flex;align-items:center}
.pop.upop{width:min(560px,calc(100vw - 24px))}
.upapers{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 16px}
.upaper+.upaper{border-top:0}
.upapers>.key{grid-column:1/-1}
.uph{display:grid;grid-template-columns:1fr auto;gap:4px 8px;align-items:center}
.uph .tag{justify-self:start}.uph .code{font-size:11px;justify-self:end}
.uph>b{grid-column:1;margin-left:0;justify-self:start;font-size:23px}.uph .mk{grid-column:2;font-size:11px;min-width:0}
.sh-box .pop.upop{width:auto}
@media(max-width:639px){.upapers{gap:0 10px}.uph .code{font-size:10px}.uph .mk{font-size:10px}}

/* A single neutral bar divides the reused marks between specifications. */
.paper-specs{margin:18px 0 0}
.paper-specs figcaption{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:var(--mut);margin-bottom:7px}
.paper-specbar{display:flex;height:10px;overflow:hidden;border-radius:2px;background:var(--line)}
.paper-specbar>span{display:block;flex:none;height:100%}
.spec-current{background:#35353a}
.spec-previous{background:repeating-linear-gradient(135deg,#797980 0 3px,#b4b4bb 3px 6px)}
.spec-earlier{background:radial-gradient(#666 1px,transparent 1px) 0 0/5px 5px #d5d5d9}
.spec-unknown{background:var(--line)}
.paper-speckey{display:flex;flex-wrap:wrap;gap:6px 24px;list-style:none;margin:8px 0 0;padding:0;font-size:12px;color:var(--mut)}
.paper-speckey li{display:flex;align-items:center;gap:6px}
.paper-speckey i{width:10px;height:10px;border-radius:1px;flex:none}
.paper-speckey b{color:var(--ink);font-weight:600}
.paper-spec-empty{font-size:12px;color:var(--mut);margin:16px 0 0}
@media print{.paper-specbar>span,.paper-speckey i{print-color-adjust:exact;-webkit-print-color-adjust:exact}}

/* UX audit: keep phone controls readable and download links easy to select. */
.unit a{display:inline-flex;align-items:center;min-height:32px}
@media(max-width:720px){
 .pv-tools{display:flex;flex-wrap:wrap;gap:0 8px}
 .question-jump{flex:1 1 calc(100% - 100px);order:0}
 .pv-tools .step{order:0;flex:none}
 .pv-tools .only{order:1;white-space:nowrap}
 .pv-tools .legend-help{order:2;margin-left:auto}
 .unit a{min-height:44px}
}
@media(max-width:480px){.unit{flex-basis:calc(50% - 4px)}}

/* Comparison reading view: one exam identity, quiet controls, then the evidence. */
.brand{gap:10px;margin-right:26px;font-weight:400;letter-spacing:0}
.logo{display:block;flex:none;width:31px;height:34px;padding:0;border-radius:0;background:none}
.logo svg{display:block;width:100%;height:100%}
.bt{display:grid;gap:2px;line-height:1}
.bt strong{font:700 23px/.95 var(--serif);letter-spacing:-.025em}
.bt>span{font:600 9px/1.2 var(--sans);letter-spacing:.1em;text-transform:uppercase}
.exam-context{display:flex;align-items:center;gap:12px;margin:0 0 6px;min-width:0}
.exam-back{display:grid;place-items:center;flex:none;width:32px;height:32px;color:var(--ink);border-radius:4px}
.exam-back svg,.step svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.exam-name{display:flex;align-items:baseline;gap:14px;min-width:0}
.exam-name h1{font:600 17px/1.3 var(--sans);letter-spacing:0;margin:0;max-width:none;text-wrap:nowrap}
.exam-name>span{font-size:13px;color:var(--mut)}
.exam-code{display:flex;align-items:center;gap:12px;margin-left:auto;flex:none}
.exam-code>a{font-size:12px;text-decoration:none;color:var(--mut);white-space:nowrap}
.exam-code>a:hover{text-decoration:underline;color:var(--link)}
.pv-nav .pv-nav-in{padding-top:8px;padding-bottom:0}
.pv-nav .strip{height:32px}
.pv-tools{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:0 20px;margin-top:0}
.question-nav{display:flex;align-items:center;gap:2px;min-width:0}
.question-step{display:flex;align-items:center;justify-content:center;gap:5px;min-width:44px;min-height:44px;padding:0 8px;border:0;background:transparent;color:var(--ink);font-size:12px;cursor:pointer;touch-action:manipulation}
.question-step svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.question-step:disabled{opacity:.3;cursor:default}
.question-step:active:not(:disabled):not([aria-disabled=true]){background:var(--soft)}
.question-picker{position:relative;order:0}
.question-picker>summary{display:flex;align-items:center;gap:8px;min-height:44px;padding:0 10px;list-style:none;cursor:pointer;color:var(--ink)}
.question-picker>summary::-webkit-details-marker{display:none}
.question-picker>summary>svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.5}
[data-picker-current]{display:flex;align-items:baseline;gap:8px;font-size:15px}
[data-picker-current] b{font-weight:600}
[data-picker-current] small{font-size:12px;color:var(--mut)}
.question-picker[open]>summary>svg{transform:rotate(180deg)}
.question-picker-panel{position:absolute;top:100%;left:0;width:min(340px,calc(100vw - 40px));max-height:min(55dvh,calc(100dvh - var(--paper-nav-height,170px) - 76px));overflow:auto;padding:14px;background:var(--card);border-radius:8px;box-shadow:0 8px 28px #0002;z-index:5;overscroll-behavior:contain}
.question-picker-panel>p{margin:0 0 12px;font-size:13px;font-weight:600;color:var(--ink)}
.question-choices{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:5px}
.question-choices .tile{width:100%;min-width:0;min-height:44px;padding:0;border:0;cursor:pointer;font-size:14px}
.question-choices [aria-current]{outline:2px solid var(--ink);outline-offset:1px}
.question-picker-panel>.key{display:flex;margin:14px 0 0;gap:7px 12px;font-size:11px}
.paper-options{display:flex;align-items:center;gap:20px;margin-left:auto}
.paper-options:empty{display:none}
.view-option{position:relative;display:flex;align-items:center;gap:6px;min-height:44px;cursor:pointer;color:var(--mut);font-size:12px;white-space:nowrap;touch-action:manipulation}
.view-option input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer}
.view-option>svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;pointer-events:none}
.view-option>i{width:11px;height:11px;position:relative;pointer-events:none}
.view-option>i::after{content:"";position:absolute;width:7px;height:4px;border-left:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(-45deg);top:2px;left:1px;opacity:0}
.view-option:has(input:checked){color:var(--ink)}
.view-option:has(input:checked)::after{content:"";position:absolute;bottom:3px;left:23px;right:0;height:2px;background:var(--ink);pointer-events:none}
.view-option input:checked~i::after{opacity:1}
.view-option:has(input:focus-visible){outline:2px solid var(--link);outline-offset:0;border-radius:3px}
.pv-body{padding-top:0}
.pv .qs{scroll-margin-top:var(--paper-nav-height,170px);padding:12px 0 22px}
.pv .qs-h{padding-right:0;margin-bottom:4px;gap:5px 12px}
.pv .qs-h .question-count{font-size:12px}
.pv .qs-actions{margin-left:auto;min-width:0;text-align:right;font-size:12px}
.pv .qs-actions>summary{min-height:32px;list-style:none;color:var(--link);font-weight:500}
.pv .qs-actions>summary::-webkit-details-marker{display:none}
.pv .qs-actions>summary::after{content:"";display:inline-block;width:5px;height:5px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg);margin:0 2px 3px 7px}
.pv .qs-actions>div{right:0;left:auto;min-width:220px}
.simple-parts{gap:4px 14px;margin:0 0 8px;font-size:12px}
.simple-parts .qs-parts-h{color:var(--mut)}
.simple-parts .pp b{font-weight:600;margin-left:2px}
.pv .comparison-caption{border:0;min-height:42px;padding:0;margin:0 0 6px}
.pv .comparison-role{gap:8px;min-height:24px}
.pv .comparison-role>b{font-size:18px}
.pv .comparison-role .tag{font-size:9px;min-height:17px;padding:3px 5px}
.source-question{margin-left:auto;color:var(--mut);font-size:12px}
.pv .comparison-identity{gap:8px 16px;margin-top:1px;font-size:12px}
.pv .comparison-identity>a{color:var(--mut);font-size:11px;text-decoration:none}
.pv .comparison-identity>a:hover{color:var(--link);text-decoration:underline}
.pv .qs-none{border:0;min-height:0;padding:6px 0;font-size:13px}
@media(hover:hover) and (pointer:fine){
 .exam-back:hover,.question-step:hover:not(:disabled):not([aria-disabled=true]){background:var(--soft)}
 .view-option:hover{color:var(--ink)}
 .question-picker>summary:hover b,.qs-actions>summary:hover{text-decoration:underline;text-underline-offset:3px}
}
@media(max-width:720px){
 .brand{gap:8px;margin-right:auto}.logo{width:27px;height:30px}
 .bt strong{font-size:21px}.bt>span{font-size:8px}
 .exam-context{gap:8px;margin-bottom:4px}
 .exam-name{display:block;flex:1;line-height:1.3}
 .exam-name h1{font-size:16px}.exam-name>span{font-size:12px}
 .exam-back{width:24px;height:36px}
 .exam-code{flex-direction:column;align-items:flex-end;gap:5px;margin-left:0}
 .exam-code>a{font-size:10px}.exam-code .tag{font-size:9px;min-height:18px}
 .pv-nav .pv-nav-in{padding-top:6px;padding-bottom:0}
 .pv-nav .strip{height:26px}
 .pv-tools{display:flex;flex-wrap:wrap;gap:0}
 .question-nav{width:100%;justify-content:space-between}
 .question-step{padding:0;width:44px}
 .question-step>span{display:none}
 .question-picker>summary{justify-content:center}
 .paper-options{width:100%;justify-content:space-between;margin-left:0;gap:8px}
 .view-option{font-size:12px}
 .question-picker-panel{left:50%;transform:translateX(-50%);width:min(340px,calc(100vw - 32px));max-height:min(50dvh,calc(100dvh - var(--paper-nav-height,170px) - 76px))}
 .question-choices{grid-template-columns:repeat(5,minmax(0,1fr))}
 .pv .qs-h{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:0 8px}
 .pv .qs-h>h2{grid-column:1;grid-row:1;font-size:23px}
 .pv .qs-h>.pill{grid-column:2;grid-row:1;justify-self:end}
 .pv .qs-h>.question-count{grid-column:1;grid-row:2}
 .pv .qs-h>.qs-actions{grid-column:2;grid-row:2;margin:0}
 .pv .qs-actions>summary{min-height:32px}
 .pv .comparison-caption{min-height:0;margin-bottom:6px}
 .pv .comparison-role>b{font-size:18px}
 .simple-parts{font-size:12px;gap:4px 12px;margin-bottom:8px}
 .pv-head{padding-top:20px}
}
@media print{
 .brand{display:none!important}
 .pv .comparison-caption{min-height:0}
}

@media print{
 .pv .pv-nav{display:block!important;position:static;backdrop-filter:none;border:0;background:transparent}
 .pv .pv-nav .strip,.pv .pv-nav .pv-tools,.pv .exam-back{display:none!important}
 .pv .exam-context{margin-bottom:12px}
 .pv .exam-name h1{font-size:18px}
 .pv .exam-code>a{color:var(--ink)}
}

/* Keep the paper summary in one reading band on wide screens. */
@media(min-width:1000px){
 .pv-head{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:8px 36px;padding-top:18px;padding-bottom:8px}
 .pv-head>.paper-result{grid-column:1;grid-row:1;align-self:center}
 .pv-head>.paper-specs,.pv-head>.paper-spec-empty{grid-column:2;grid-row:1;margin:0}
 .pv-head>.paper-context{grid-column:1/-1;margin:0}
 .pv-head>.aside{grid-column:1/-1}
 .paper-speckey{gap:6px 16px}
 .hero h1{max-width:30ch}
 .hero+.block{padding-top:32px}
}

/* Anchor questions flush below the two sticky headers, without the old 76px offset. */
html:has(.pv){scroll-padding-top:61px}
.pop-sum{display:flex;align-items:baseline;justify-content:space-between;gap:8px}
.pop-sum>strong{font-size:12px;color:var(--mut);font-weight:500}
@media(max-width:720px){html:has(.pv){scroll-padding-top:55px}}

/* Paper identities lead each comparison; the question controls support them. */
.pv .exam-context{justify-content:space-between;min-height:28px;margin-bottom:6px}
.pv .exam-context h1{margin:0;font:500 13px/1.3 var(--sans);letter-spacing:0;max-width:none;color:var(--mut)}
.pv .exam-back{display:inline-flex;width:auto;height:auto;min-height:32px;font-size:12px;text-decoration:none;color:var(--link)}
.pv .exam-back:hover{text-decoration:underline;background:none}
.question-step{padding:0 10px}
.question-picker>summary{gap:0}
[data-picker-current]{font-size:13px}
[data-picker-current] small{font-size:12px}
.question-picker>summary [data-picker-current]{border-bottom:2px solid var(--ink);line-height:1.7}
.comparison-identities{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:24px;margin-bottom:8px}
.paper-identity{min-width:0}
.paper-identity .paper-title{display:block;margin:0}
.paper-role{display:block;font:600 13px/1.5 var(--sans);color:var(--mut);margin-bottom:3px}
.paper-date{display:block;font:700 30px/1.15 var(--serif);letter-spacing:-.02em;color:var(--ink);margin:0}
.paper-subject{margin:5px 0 3px;font-size:14px;color:var(--ink)}
.paper-reference{display:flex;flex-wrap:wrap;align-items:baseline;gap:3px 14px;margin:0;font-size:14px;color:var(--mut)}
.official-code{font-size:16px;color:var(--ink);font-weight:600;white-space:nowrap;user-select:text}
.paper-question{white-space:nowrap;font-size:13px}
.reference-copy{display:inline-flex;align-items:center;min-height:32px;padding:0;border:0;background:none;font:500 12px/1.4 var(--sans);color:var(--link);text-align:left;cursor:pointer;text-underline-offset:3px;touch-action:manipulation}
.reference-copy:hover{text-decoration:underline}
.comparison-actions{display:flex;align-items:center;gap:20px;margin-left:auto}
.comparison-actions>a{display:inline-flex;align-items:center;min-height:32px;font-size:12px;font-weight:500;text-decoration:none}
.comparison-actions>a:hover{text-decoration:underline}
.pv .qs-h{display:flex;align-items:center;flex-wrap:wrap;gap:4px 12px;min-height:32px;margin:0 0 2px;padding:0}
.pv .qs-h .pill{font-size:11px}
.pv .qs-h .question-count{font-size:13px}
.pv .simple-parts{margin-bottom:12px}
.paper-select{width:100%;border:0;border-radius:0;padding:0;background:none;text-align:left;color:var(--ink);cursor:pointer;touch-action:manipulation}
.unmatched>p{font:500 22px/1.3 var(--serif);margin:4px 0;color:var(--mut)}
.pv .qs-cols>.qs-none{display:none}
@media(max-width:720px){
 .pv .exam-context{margin-bottom:3px}
 .pv .exam-context h1{font-size:12px}
 .pv .exam-back{min-height:28px}
 .question-step{width:auto;min-width:60px;padding:0 5px;font-size:12px}
 .question-step>span{display:inline}
 .question-picker>summary{padding:0 5px}
 [data-picker-current]{font-size:13px;gap:5px}
 .question-nav{justify-content:space-between}
 .paper-options{gap:10px}
 .comparison-identities{gap:16px;margin-bottom:6px}
 .paper-role{font-size:12px;margin-bottom:4px;line-height:1.35}
 .paper-date{font-size:22px;line-height:1.2;letter-spacing:-.025em}
 .paper-subject{font-size:13px;margin:5px 0 3px}
 .paper-reference{display:block;line-height:1.6}
 .official-code{display:block;font-size:15px}
 .paper-question{display:block;font-size:12px}
 .paper-select{min-height:52px;padding-bottom:5px;border-bottom:2px solid transparent}
 .paper-select[aria-pressed="true"]{border-color:var(--ink)}
 .paper-select[aria-pressed="false"] .paper-date{color:var(--mut)}
 .reference-copy{min-height:36px}
 .comparison-actions{width:100%;margin:0;justify-content:space-between;gap:12px}
 .comparison-actions .reference-copy,.comparison-actions>a{min-height:32px}
 .pv .qs-h{gap:3px 8px}
 .pv .simple-parts{font-size:12px;gap:3px 10px;margin-bottom:10px}
 .pv .qs-cols{grid-template-columns:minmax(0,1fr);gap:0}
 .pv .qs-ms{grid-template-columns:minmax(0,1fr)}
 .pv .qs-ms figure{grid-column:1}
 .unmatched>p{font-size:20px}
}
@media print{
 .paper-select,.reference-copy,.comparison-actions{display:none!important}
 .paper-title[hidden]{display:block!important}
 .qs-cols>[hidden],.qs-ms>[hidden]{display:block!important}
 .paper-date{font-size:22px}
 .paper-role,.paper-reference,.official-code{font-size:12px}
}

/* Variant and date are distinct parts of each paper's identity. */
.paper-identity .paper-role{display:flex;align-items:center;flex-wrap:wrap;gap:6px 10px;min-height:26px;margin:0 0 7px}
.paper-identity .paper-role .tag{font-size:13px;line-height:1.4;letter-spacing:.025em;padding:4px 7px;min-height:26px;vertical-align:0}
.source-timing{font-size:12px;font-weight:500;color:var(--mut)}
@media(max-width:720px){
 .paper-identity .paper-role{gap:3px 6px;min-height:26px;margin-bottom:6px}
 .paper-identity .paper-role .tag{font-size:12px;padding:4px 6px}
 .source-timing{font-size:11px}
 .paper-select{min-height:61px}
}

.mobile-source-timing{display:none}
@media(max-width:720px){
 .paper-role .source-timing{display:none}
 .mobile-source-timing{display:inline;margin-left:8px;font-size:11px;color:var(--mut)}
}

/* 17 Oct audit: paper identity, side roles, verdict links, notes */
.pv .exam-context h1{font:600 15px/1.3 var(--sans);color:var(--ink);display:flex;flex-wrap:wrap;align-items:center;gap:4px 8px}
.pv .exam-context h1 .official-code{font-size:13px;font-weight:500;color:var(--mut)}
@media (max-width:720px){.pv .exam-context h1{font-size:13px}.pv .exam-context h1 .official-code{display:inline;font-size:12px}}
.side-role{font:700 12px/1.4 var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--ink)}
.paper-identity .paper-role .tag.cn,.paper-identity .paper-role .tag.gl{background:transparent;color:var(--ink);border:1px solid var(--line)}
a.pill{text-decoration:none;cursor:help}
a.pill:hover,a.pill:focus-visible{outline:2px solid var(--ink);outline-offset:1px}
.question-note{margin:-2px 0 8px;font-size:12px;color:var(--mut)}
.show-all-note{margin:8px 0 0}
.linkbtn{background:none;border:0;padding:0;font:inherit;color:var(--ink);text-decoration:underline;cursor:pointer;min-height:24px}
.method-reproduce{border-left:3px solid var(--ink);padding:4px 0 4px 16px;font-size:15px}
.method-verdicts{margin:0 0 18px}

/* Keep the agreed variant distinction prominent in the combined UI. */
.paper-identity .paper-role .tag.cn{background:var(--ink);color:#fff;border:0}
.paper-identity .paper-role .tag.gl{background:transparent;color:var(--mut);border:0;box-shadow:inset 0 0 0 1px var(--faint)}
.pv .exam-context h1{font:500 13px/1.3 var(--sans);color:var(--mut)}
.prose h2[id],details[id]{scroll-margin-top:84px}

/* 17 Oct audit: phones and accessibility */
.pane-label{position:sticky;top:var(--paper-nav-height,170px);z-index:2;margin:0 0 6px;padding:6px 8px;background:var(--bg);border-bottom:1px solid var(--line);font:400 12.5px/1.4 var(--sans);color:var(--mut)}
.pane-label b{color:var(--ink);font-weight:700;margin-right:4px;text-transform:uppercase;letter-spacing:.05em;font-size:11.5px}
.switch-hint{display:none}
@media (max-width:720px){
 .switch-hint{display:block;margin:0 0 6px;font-size:12px;color:var(--mut)}
 .comparison-identities[role=group]{border:1px solid var(--line);border-radius:8px;padding:4px}
 .paper-select[aria-pressed=true]{background:var(--soft);border-radius:6px}
 .paper-select[aria-pressed=false] .paper-date{color:var(--ink)}
 .paper-select[aria-pressed=false]{border-bottom:2px dashed var(--line)}
 html:has(.pv){scroll-padding-top:55px}
 .bar .tg .tag{font-size:10px;letter-spacing:0}
}
.question-step[aria-disabled=true]{opacity:.3;cursor:default}
.blk.NEW{box-shadow:inset 0 0 0 1px #4d8a62}
.blk-b.cur .blk.NEW{box-shadow:0 0 0 2px var(--bg),0 0 0 4px var(--ink),inset 0 0 0 1px #4d8a62}
.pv .qs-h .pill{font-size:12.5px}
.blk-b .ql{font-size:12px}
.reference-copy,.comparison-actions>a,.paper-context>a,.pv .exam-back{min-height:44px;display:inline-flex;align-items:center}
.comparison-actions>a{padding:0 10px}
.sum-h{display:inline;font:inherit;margin:0}
h1[tabindex="-1"]:focus:not(:focus-visible){outline:none}

/* 17 Oct: Papers page, Overview "find your paper", Method reproduce */
.papers-page .block{padding-top:8px}
.pfilters{display:flex;flex-wrap:wrap;gap:10px 18px;margin:0 0 14px;font-size:14px}
.pfilters label{display:flex;flex-direction:column;gap:4px;color:var(--mut);font-size:12.5px}
.pfilters select{min-height:44px;min-width:150px;padding:0 10px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);font:inherit;font-size:14px}
.plist td,.plist th{vertical-align:middle}
.plist td a{font-weight:600}
.plist .official-code{font-size:14px}
.plist small{color:var(--mut)}
.find-block .hero-actions{margin-top:10px;display:flex;flex-wrap:wrap;gap:12px 22px;align-items:center}
.dl-list{margin:6px 0 20px}
@media (max-width:720px){
 .plist thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
 .plist,.plist tbody{display:block;width:100%}
 .plist tr{display:grid;grid-template-columns:auto auto 1fr;align-items:center;gap:6px 12px;padding:12px 0;border-bottom:1px solid var(--line)}
 .plist td{display:block;border:0;padding:0}
 .plist td:first-child{grid-column:1/-1}
 .plist td:last-child{text-align:right}
 .pfilters select{min-width:0;width:100%}
 .pfilters label{flex:1 1 140px}
}
@media (max-width:720px){.table-scroll .plist,.plist{min-width:0!important;width:100%!important}.plist tr{grid-template-columns:auto auto minmax(0,1fr)}}

/* 17 Oct: "why" box, example callout, guided tour */
.why-box{position:relative;margin:10px 0 14px;padding:12px 16px 12px 16px;background:var(--card);border:1px solid var(--line);border-left:4px solid var(--ink);border-radius:8px;max-width:92ch}
.qs.VERBATIM .why-box{border-left-color:var(--v)}.qs.PARTIAL .why-box{border-left-color:var(--p)}.qs.REFRESH .why-box{border-left-color:var(--r)}.qs.NEW .why-box{border-left-color:var(--n)}
.why-h{display:flex;align-items:center;gap:8px;margin:0 0 6px;font:700 12px/1.3 var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--ink)}
.why-h span{display:inline-grid;place-items:center;width:18px;height:18px;border-radius:50%;background:var(--ink);color:var(--bg);font:italic 700 12px/1 var(--serif);letter-spacing:0;text-transform:none}
.why-box .comparison-notes{margin:0;font-size:15px}
.why-box .comparison-notes dt{font-weight:700}
.why-box .comparison-notes dd{color:var(--body)}
.method-lead em{font-style:italic}
.method-lead strong{font-weight:700;background:linear-gradient(transparent 62%,color-mix(in srgb,var(--p) 35%,transparent) 0)}
.method-example{border:1px solid var(--line);border-left:4px solid var(--ink);border-radius:8px;padding:12px 16px;background:var(--card);color:var(--body);font-size:15px}
.method-example p{margin:0 0 6px}
.method-example .ex-label{font:700 12px/1.3 var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--ink)}
.method-example .ex-links{display:flex;flex-wrap:wrap;gap:6px 22px;margin:8px 0 0}
.method-example .ex-links a{display:inline;font-weight:600}
.tour-btn{border:0;border-radius:0;background:transparent;color:var(--mut);padding:0;cursor:pointer;font:inherit;font-size:12px;min-height:44px;display:inline-flex;align-items:center;gap:6px}
.tour-btn svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round}
.tour-btn:hover{color:var(--ink)}
.tour-spot{position:fixed;z-index:60;border-radius:10px;box-shadow:0 0 0 3px var(--ink),0 0 0 7px rgb(255 255 255/.6);pointer-events:none;transition:top .35s ease,left .35s ease,width .35s ease,height .35s ease}
.tour-dim{position:fixed;z-index:59;background:rgb(10 10 14/.5)}
@media (prefers-reduced-motion:reduce){.tour-dim{transition:none}}
.tour-target{position:relative}
.tour-tip{position:fixed;z-index:61;background:var(--card);color:var(--body);border-radius:12px;padding:16px 18px 14px;box-shadow:0 14px 40px rgb(0 0 0/.28);font-size:15px;line-height:1.5;outline:none}
.tour-tip.in{animation:tourIn .28s ease both}
@keyframes tourIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.tour-tip::before{content:"";position:absolute;left:calc(var(--arrow,40px) - 9px);width:18px;height:18px;background:var(--card);transform:rotate(45deg)}
.tour-tip[data-side=below]::before{top:-8px}
.tour-tip[data-side=above]::before{bottom:-8px}
.tour-tip[data-side=sheet]{left:12px;right:12px;bottom:12px;top:auto;width:auto}
.tour-tip[data-side=sheet]::before{display:none}
.tour-tip h2{margin:2px 0 6px;font:700 18px/1.25 var(--serif);color:var(--ink)}
.tour-tip p{margin:0 0 10px}
.tour-count{font-size:12px;color:var(--mut);margin:0!important;letter-spacing:.04em}
.tour-btns{display:flex;justify-content:flex-end;align-items:center;gap:8px}
.tour-btns .btn{min-height:40px}
.tour-skip{margin-right:auto;background:none;border:0;color:var(--mut);text-decoration:underline;cursor:pointer;font:inherit;font-size:13.5px;min-height:40px}
.tk{display:inline-block;width:10px;height:10px;border-radius:2px;margin:0 3px 0 6px;vertical-align:-1px}
.tk.VERBATIM{background:var(--v)}.tk.PARTIAL{background:var(--p)}.tk.REFRESH{background:var(--r)}.tk.NEW{background:var(--n)}
.tour-offer{position:fixed;z-index:55;right:16px;bottom:16px;max-width:340px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;box-shadow:0 10px 30px rgb(0 0 0/.18);font-size:14.5px;animation:tourIn .35s ease .6s both}
.tour-offer p{margin:0 0 10px}
.tour-offer div{display:flex;gap:10px;align-items:center}
@media (max-width:720px){.tour-offer{left:12px;right:12px;bottom:12px;max-width:none}.tour-btn span{display:none}.tour-btn{padding:0 10px;min-height:44px}}
@media (prefers-reduced-motion:reduce){.tour-spot{transition:none}.tour-tip.in,.tour-offer{animation:none}}

/* 17 Oct: Method walkthrough */
.pipe-intro{font-size:17px;color:var(--ink)}
.flow{list-style:none;padding:0;margin:16px 0 26px;display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.flow li{position:relative;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.flow li b{display:block;font:700 26px/1.1 var(--serif);color:var(--ink)}
.flow li span{display:block;font-size:13px;color:var(--mut);margin-top:4px}
.flow li:not(:last-child)::after{content:"→";position:absolute;right:-12px;top:50%;transform:translateY(-50%);z-index:1;width:18px;height:18px;border-radius:50%;background:var(--bg);display:grid;place-items:center;font-size:12px;color:var(--mut)}
.flow li:last-child{border-color:var(--ink);border-width:2px}
.pipeline{list-style:none;padding:0;margin:0 0 28px;position:relative}
.pipeline::before{content:"";position:absolute;left:19px;top:20px;bottom:20px;width:2px;background:var(--line)}
.stage{position:relative;padding:0 0 26px 56px}
.stage-h{display:flex;align-items:center;gap:14px;margin-left:-56px}
.stage-n{flex:none;width:40px;height:40px;border-radius:50%;background:var(--ink);color:var(--bg);display:grid;place-items:center;font:700 18px/1 var(--serif);position:relative;z-index:1}
.stage-k{margin:0;font:600 12px/1.3 var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--mut)}
.stage h3{margin:2px 0 0;font:700 20px/1.25 var(--serif);color:var(--ink)}
.stage-say{font-size:16.5px;color:var(--ink);margin:10px 0}
.stage-ex{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:10px 0;font-size:15px}
.stage-ex p{margin:0 0 6px}.stage-ex p:last-child{margin:0}
.stage-ex.tidy s{color:var(--mut);text-decoration-thickness:2px}
.stage-ex mark{background:color-mix(in srgb,var(--p) 35%,transparent);padding:0 2px;border-radius:3px}
.rule-list{margin:4px 0 0;padding-left:20px}.rule-list li{margin:0 0 6px}
.ex-label{font:700 12px/1.3 var(--sans)!important;letter-spacing:.06em;text-transform:uppercase;color:var(--ink);margin:0 0 6px!important}
.exact{margin:8px 0 0;font-size:14.5px}
.exact>summary{cursor:pointer;font-weight:600;color:var(--ink);min-height:32px;display:flex;align-items:center;gap:6px}
.exact>summary::before{content:"+";display:inline-grid;place-items:center;width:18px;height:18px;border:1px solid var(--line);border-radius:4px;font-size:13px}
.exact[open]>summary::before{content:"−"}
.exact>*:not(summary){color:var(--body)}
.demo{background:var(--card);border:2px solid var(--ink);border-radius:12px;padding:14px 16px;margin:12px 0}
.demo-presets{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 10px}
.demo-presets button{border:1px solid var(--line);background:var(--bg);border-radius:999px;padding:0 12px;min-height:36px;font:inherit;font-size:13px;cursor:pointer;color:var(--ink)}
.demo-presets button[aria-pressed=true]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.demo-in{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.demo-in label{display:flex;flex-direction:column;gap:4px;font-size:12.5px;color:var(--mut);font-weight:600}
.demo-in textarea{font:inherit;font-size:14.5px;color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:8px 10px;resize:vertical;background:var(--bg)}
.meter{position:relative;height:14px;background:var(--soft);border-radius:999px;margin:28px 0 8px}
.meter i{display:block;height:100%;border-radius:999px;background:var(--v);transition:width .4s ease}
.meter .mk{position:absolute;top:-22px;transform:translateX(-50%);font-size:11px;color:var(--mut);white-space:nowrap}
.meter .mk::after{content:"";position:absolute;left:50%;top:18px;width:2px;height:18px;background:var(--ink);opacity:.6}
.demo-score{font-size:14px;margin:6px 0}.demo-score span{color:var(--mut)}
.demo-verdict{font-size:15.5px;color:var(--ink);margin:6px 0 8px}
.demo-chips{display:flex;flex-wrap:wrap;gap:4px;margin:0}
.demo-chips span{font:12px/1.6 ui-monospace,Menlo,monospace;background:color-mix(in srgb,var(--v) 14%,transparent);border-radius:4px;padding:0 5px;color:var(--ink);animation:tourIn .3s ease both}
.demo-chips .more{background:none;color:var(--mut)}
@media (max-width:720px){.demo-in{grid-template-columns:1fr}.stage{padding-left:0}.stage-h{margin-left:0}.pipeline::before{display:none}.flow li:not(:last-child)::after{display:none}}
@media (prefers-reduced-motion:reduce){.meter i,.demo-chips span{transition:none;animation:none}}
@media (min-width:900px){.flow{grid-template-columns:repeat(5,1fr)}}
/* the paper identities above each question already label the two columns on a wide screen */
@media (min-width:721px){.pane-label{display:none}}
/* the "compare the wording" demo on a question */
.wording{margin:8px 0 12px}
.wording-btn{display:flex;align-items:center;gap:8px;width:100%;text-align:left;background:transparent;border:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);border-radius:0;padding:8px 0;cursor:pointer;font:inherit;color:var(--ink);min-height:44px}
.wording-btn:hover{background:var(--soft)}
.wording-btn b{display:block;font-size:13px;font-weight:600}
.wording-intro{margin:0 0 10px;font-size:13px;color:var(--mut)}
.wording-btn::after{content:"+";margin-left:auto;font-size:18px;color:var(--mut)}
.wording-btn[aria-expanded=true]::after{content:"−"}
.wording-ic{flex:none;display:grid;place-items:center;width:20px;height:20px;color:var(--mut);font:700 17px/1 var(--serif)}
.wording-body{border:1px solid var(--line);border-top:0;padding:14px;margin-top:0;background:var(--card)}
.wording-btn[aria-expanded=true]{background:var(--soft);padding-left:10px;padding-right:10px;border-top-color:var(--ink)}
.wording-note{font-size:13px;color:var(--mut);margin:8px 0 0}
.wording-body textarea{font-size:13px}
.tour-spot.tour-follow,.tour-dim.tour-follow{transition:none}
.tour-tip[data-side=corner]{right:24px;bottom:24px;left:auto;top:auto;width:360px}
.tour-tip[data-side=corner]::before{display:none}

/* 17 Oct: frozen two-paper header (like frozen columns in a spreadsheet) */
.colhead{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:8px;border-top:1px solid var(--line)}
.colcell{display:flex;flex-wrap:wrap;align-items:baseline;gap:2px 10px;padding:8px 0 9px;background:none;border:0;text-align:left;font:inherit;color:var(--ink);cursor:default;min-width:0;border-radius:6px}
.colcell .side-role{flex:0 0 100%;font-size:11px}
.colcell .colname{display:inline-flex;flex-wrap:wrap;align-items:center;gap:4px 8px;font:650 18px/1.3 var(--sans);letter-spacing:-.015em}
.colcell .colname .official-code{font-size:14px;font-weight:500;color:var(--ink);letter-spacing:0}
.colcell .colq{font-size:13.5px;color:var(--mut)}
.colcell:disabled{cursor:default}
.colcell.changed .colname{animation:colflash .2s ease}
.keyboard-input .colcell.changed .colname{animation:none}
@keyframes colflash{from{opacity:.65}to{opacity:1}}
.qline{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 14px;margin:0 0 6px}
.qtitle{margin:0;font:600 18px/1.3 var(--sans);color:var(--ink)}
.qtitle small{font:500 14px var(--sans);color:var(--mut);margin-left:4px}
.qsrc{margin:0;font-size:14px;color:var(--mut)}
.qsrc b{color:var(--ink)}
.qsrc .official-code{font-size:13px;color:var(--mut);font-weight:500}
.pane-label{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
@media (max-width:720px){
 .colhead{gap:8px;padding:6px 0 8px}
 .colcell{cursor:pointer;border:1px solid var(--line);padding:6px 8px;min-height:44px;gap:0 6px}
 .colcell[aria-pressed=true]{border-color:var(--ink);box-shadow:inset 0 -2px 0 var(--ink);background:var(--soft)}
 .colcell .colname{font-size:13px;gap:3px 6px;letter-spacing:0}
 .colcell .colname .official-code{font-size:12px}
 .colcell .colname .tag{font-size:10px;padding:1px 4px}
 .colcell .colq{font-size:12px}
 .qtitle{font-size:16px}
}
@media (prefers-reduced-motion:reduce){.colcell.changed .colname{animation:none}}

/* 17 Oct: pop-ups grow out of what was clicked; a unit opens in place under its row */
@keyframes popGrow{from{opacity:0;transform:scale(.94)}to{opacity:1;transform:none}}
.pop:not(.inline){animation:popGrow .16s cubic-bezier(.2,.8,.2,1)}
.pexp{display:grid;grid-template-rows:0fr;transition:grid-template-rows .18s cubic-bezier(.2,.8,.2,1),opacity .15s ease;opacity:0}
.pexp.open{grid-template-rows:1fr;opacity:1}
.pexp-in{overflow:hidden;min-height:0;margin:0 0 0 12px;border-left:2px solid var(--ink);padding-left:2px}
.pexp-sum{margin:8px 8px 4px;font-size:13px;color:var(--mut)}
.pexp-sum b{color:var(--ink)}
.pexp-sum .official-code{font-size:13px}
.keyboard-input .pop:not(.inline){animation:none}
.keyboard-input .pexp{transition:none}
.prow .go{transition:transform .25s ease}
.prow.sel .go{transform:rotate(90deg)}
@media (prefers-reduced-motion:reduce){.pop:not(.inline){animation:none}.pexp{transition:none}.pexp.open .tile{animation:none}}
.papers-page{padding-top:44px}
.papers-lead{font-size:16px;color:var(--body);max-width:68ch;margin:0 0 18px}
.papers-page .block{padding-top:44px}
@media (max-width:720px){.wording-body textarea,.demo-in textarea{font-size:16px;font-weight:400}}

/* Approved scrolling comparison: a persistent target, source headings scoped to their questions. */
.pv{--site-height:60px;--identity-height:94px;--comparison-gap:28px}
.pv .pv-nav{top:var(--site-height);background:var(--bg);backdrop-filter:none}
.pv .pv-nav-in{padding-top:4px;padding-bottom:5px}
.paper-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px}
.pv .paper-toolbar .exam-context{justify-content:flex-start;gap:20px;margin:0}
.pv .paper-toolbar h1{font:600 16px/1.3 var(--sans);color:var(--ink)}
.paper-toolbar .paper-options{margin-left:auto}
.pv .strip{height:40px;margin-top:2px}
.pv .pv-body{position:relative;padding-top:0}
.pv .target-head,.pv .source-head{position:sticky;top:calc(var(--site-height) + var(--paper-nav-height));height:var(--identity-height);min-height:94px;background:var(--bg);padding:10px 0;border-bottom:1px solid var(--line);z-index:8}
.pv .target-head{width:calc((100% - var(--comparison-gap))/2);margin-bottom:calc(-1 * var(--identity-height));z-index:10}
.pv .source-head{margin-left:calc((100% + var(--comparison-gap))/2)}
.pv .source-run{position:relative}
.pv.only .source-run.all-new{display:none}
.identity-top{display:flex;align-items:center;gap:9px;min-height:21px;margin-bottom:4px;font-size:12px;color:var(--mut)}
.identity-top .tag{font-size:11px;line-height:1.2;padding:3px 5px}
.identity-line{display:flex;align-items:center;justify-content:space-between;gap:10px}
.pv .paper-date{font:700 27px/1.2 var(--serif);letter-spacing:-.02em;margin:0}
.pv .no-source-date{font-size:22px;color:var(--mut)}
.paper-code-copy{display:flex;align-items:center;gap:9px;min-height:44px;padding:0;border:0;background:none;font:400 13px/1.3 var(--sans);color:var(--mut);white-space:nowrap;cursor:pointer;position:relative;z-index:2}
.paper-code-copy>span:last-child{color:var(--link);font-size:12px}
.paper-code-copy:hover>span:last-child{text-decoration:underline}
.paper-tab{display:none}
.pv .qs{padding:18px 0 26px;scroll-margin-top:calc(var(--paper-nav-height) + var(--identity-height));border-top:0;border-bottom:1px solid var(--line)}
.pv .qs:last-child{border-bottom:0}
.pair-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:var(--comparison-gap);align-items:start;margin-bottom:10px}
.pv .qs-h{min-height:32px;gap:5px 12px;margin:0}
.pv .qtitle{font:600 16px/1.3 var(--sans);margin:0}
.pv .qs-h .pill{font-size:11px;padding:0;background:none;border:0;gap:5px;color:var(--ink)}
.pv .qs-h .pill::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:currentColor;margin-right:5px;vertical-align:1px}
.pv .question-count{color:var(--mut)}
.pv .question-count b{color:var(--ink)}
.source-meta{display:flex;align-items:center;flex-wrap:wrap;gap:0 10px;min-height:32px}
.pv .comparison-actions{gap:14px}
.pv .simple-parts{margin:4px 0 0;font-size:12px}
.pv .simple-parts .qs-parts-h{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
.part-details{font-size:12px;color:var(--mut)}
.part-details>summary{cursor:pointer;min-height:28px;display:list-item;width:fit-content;padding:4px 0}
.no-match-note{font-size:12px;color:var(--mut)}
.pv .qs-cols,.pv .qs-ms{column-gap:var(--comparison-gap)}
.pv .wording{margin:8px 0 0}
.pv .wording-btn{width:auto;gap:8px;border:0;min-height:36px;padding:4px 0;color:var(--mut)}
.pv .wording-btn::after{margin-left:8px}
.pv .wording-btn b{font-size:12px;font-weight:500}
.pv .wording-body{border-top:1px solid var(--line)}
@media(max-width:900px){
 .identity-line{flex-wrap:wrap;gap:0}
 .paper-code-copy{min-height:28px}
 .paper-toolbar .tour-btn span{display:none}
}
@media(max-width:720px){
 .pv{--comparison-gap:14px;--identity-height:108px}
 .paper-toolbar{flex-wrap:wrap;gap:0}
 .pv .paper-toolbar .exam-context{width:100%;justify-content:space-between;gap:10px;min-height:28px}
 .pv .paper-toolbar h1{font-size:14px}
 .paper-toolbar .paper-options{width:100%;justify-content:flex-end;gap:14px}
 .paper-toolbar .tour-btn{margin-right:auto;padding:0;min-width:44px}
 .pv .pv-nav-in{padding-top:2px;padding-bottom:4px}
 .pv .strip{height:32px;margin-top:0}
 .pv .target-head,.pv .source-head{min-height:108px;padding:8px 0}
 .pv .paper-date{font-size:20px;white-space:nowrap}
 .pv .no-source-date{font-size:17px;white-space:normal}
 .identity-top{gap:6px;font-size:11px;line-height:1.3;min-height:20px}
 .identity-top .tag{font-size:10px}
 .identity-line{display:block}
 .paper-tab{display:block;position:absolute;inset:0;width:100%;border:0;border-radius:0;border-bottom:2px solid transparent;background:none;cursor:pointer;z-index:1}
 .paper-tab[aria-pressed=true]{border-bottom-color:var(--ink)}
 .paper-code-copy{min-height:32px;gap:7px;font-size:11px}
 .paper-code-copy>span:last-child{font-size:10px}
 .pv .qs{padding-top:12px;padding-bottom:22px}
 .pair-head{display:block;margin-bottom:8px}
 .pv .qtitle{font-size:14px}
 .pv .qs-h .question-count{font-size:12px}
 .source-meta{justify-content:space-between;min-height:0}
 .pv .comparison-actions{width:auto;gap:14px;margin-left:auto}
 .pv .comparison-actions>a,.pv .comparison-actions>button{min-height:44px;font-size:11px}
 .pv-body[data-side=target] .source-meta>.qtitle{display:none}
 .pv-body[data-side=source] .source-meta>.qtitle::before{content:"Earlier ";font-weight:400;color:var(--mut)}
 .pv .reference-copy{white-space:normal}
 .pv .qs-cols{display:block}
}
@media(max-width:360px){
 .pv .paper-date{font-size:18px}
 .paper-toolbar .paper-options{gap:8px}
 .paper-toolbar .view-option{font-size:12px}
}
@media print{
 .pv .target-head,.pv .source-head{position:relative;top:auto;break-after:avoid}
 .pv .target-head{width:calc((100% - var(--comparison-gap))/2)}
 .pv .paper-tab,.pv .paper-code-copy>span:last-child{display:none!important}
 .pv .paper-code-copy{min-height:20px}
 .pv .pair-head,.pv .qs-cols,.pv .qs-ms{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
 .pv .qs-cols{display:grid}
 .pv .wording{display:none}
}

.pv .qs-h .pill.VERBATIM::before{background:var(--v)}
.pv .qs-h .pill.PARTIAL::before{background:var(--p)}
.pv .qs-h .pill.REFRESH::before{background:var(--r)}
.pv .qs-h .pill.NEW::before{background:var(--n)}
.full-paper{font-size:13px;color:var(--mut)}.full-paper .original-link{margin-left:4px;font-weight:600}

/* Keep the colour criteria within reach without another permanent row. */
.verdict-help{position:relative;font-size:13px;margin-right:10px}
.verdict-help>summary{cursor:pointer;min-height:44px;display:flex;align-items:center;gap:6px;list-style:none;color:var(--mut)}
.verdict-help>summary::-webkit-details-marker{display:none}
.verdict-help>summary::after{content:"+";font-size:16px}
.verdict-help[open]>summary::after{content:"−"}
.verdict-panel{position:absolute;top:100%;right:0;width:400px;max-height:calc(100dvh - var(--site-height) - var(--paper-nav-height) - 24px);overflow:auto;padding:18px;background:var(--card);border:1px solid var(--line);border-radius:7px;box-shadow:0 6px 24px #0002;z-index:25;overscroll-behavior:contain}
.verdict-definitions{margin:0;display:grid;gap:14px}
.verdict-definitions>div{margin:0}
.verdict-definitions dt{display:flex;align-items:center;gap:8px;font:650 14px/1.4 var(--sans);color:var(--ink)}
.verdict-definitions dt i{height:10px;width:10px;flex:none;border-radius:2px}
.verdict-definitions dt i.VERBATIM{background:var(--v)}
.verdict-definitions dt i.PARTIAL{background:var(--p)}
.verdict-definitions dt i.REFRESH{background:var(--r)}
.verdict-definitions dt i.NEW{background:var(--n)}
.verdict-definitions dd{margin:3px 0 0 18px;font-size:13px;line-height:1.5;color:var(--mut)}
.verdict-panel>p{font-size:12px;line-height:1.5;margin:16px 0 4px;padding-top:12px;border-top:1px solid var(--line);color:var(--mut)}
.verdict-help-actions{display:flex;align-items:center;justify-content:space-between;gap:16px}
.verdict-help-actions a,.verdict-help-actions button{display:inline-flex;align-items:center;min-height:44px;font:500 12px/1.3 var(--sans);color:var(--link)}
.verdict-help-actions button{border:0;background:none;padding:0;cursor:pointer}
.paper-code-tools{display:flex;gap:10px;align-items:center;position:relative;z-index:2;white-space:nowrap}
.paper-catalogue{font:400 13px/1.3 var(--sans);color:var(--mut);text-decoration:underline;text-decoration-color:var(--line);text-underline-offset:3px;min-height:32px;display:inline-flex;align-items:center}
.paper-catalogue:hover{color:var(--link);text-decoration-color:currentColor}
.paper-catalogue>span{font-size:11px;margin-left:3px}
.paper-code-tools .paper-code-copy{font-size:12px;color:var(--link)}
@media(max-width:720px){
 .paper-toolbar .verdict-help{margin-right:auto}
 .verdict-panel{left:0;right:auto;width:min(400px,calc(100vw - 48px));max-height:calc(100dvh - var(--site-height) - var(--paper-nav-height) - 24px)}
 .paper-code-tools{gap:8px}
 .paper-catalogue{font-size:11px}
 .paper-code-tools .paper-code-copy{font-size:10px}
}
@media print{.verdict-help,.paper-code-tools .paper-code-copy{display:none!important}}
.method-verdicts .verdict-definitions{grid-template-columns:1fr 1fr;gap:18px 28px;margin:16px 0 20px}
.method-verdicts .verdict-definitions dd{font-size:15px}
.download-subject{margin:12px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.download-subject>summary{min-height:52px;padding:12px 0;cursor:pointer;font:650 18px/1.4 var(--sans);color:var(--ink)}
.download-subject .dlrow:last-child{border-bottom:0}
@media(max-width:720px){.method-verdicts .verdict-definitions{grid-template-columns:1fr}.download-subject>summary{font-size:17px}}
/* The root already reserves the site header when following section links. */
.prose h2[id],.prose details[id]{scroll-margin-top:8px}
.verdict-help>summary{white-space:nowrap}
@media(max-width:360px){
 .paper-toolbar .verdict-help{font-size:12px;margin-right:auto}
 .paper-toolbar .verdict-help>summary{gap:4px}
 .paper-toolbar .view-option{gap:4px}
 .paper-toolbar .view-option>i{display:none}
 .paper-toolbar .view-option>svg{width:14px;height:14px}
}

/* Mobile journey audit: readable chart pairs, less frozen chrome, usable controls. */
.view-settings{margin-left:auto;position:relative}
.view-settings>summary,.mobile-questions{display:none}
.paper-list-jump{margin:0 0 20px;font-size:14px}
.paper-list-jump a{display:inline-flex;min-height:44px;align-items:center}
.research-downloads{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:32px 0}
.research-downloads>summary{min-height:56px;cursor:pointer;font:650 18px/1.4 var(--sans);padding:14px 0;color:var(--ink)}
.research-downloads>p{font-size:15px;color:var(--mut)}
.research-downloads .dl{margin:10px 0}
@media(max-width:720px){
 .chart .plot{display:block;margin:10px 0 0;gap:0}
 .chart .glines{display:none}
 .chart .col{display:grid;grid-template-columns:66px minmax(0,1fr);column-gap:8px;padding:9px 0;border-bottom:1px solid var(--line)}
 .chart .col:last-child{border-bottom:0}
 .chart .col .pair{grid-column:2;grid-row:1;display:flex;flex-direction:column;align-items:stretch;gap:0;height:auto;border:0}
 .chart .col .x{grid-column:1;grid-row:1;align-self:center;text-align:left;padding:0;font-size:13px;line-height:1.4}
 .chart .col .x small{font-size:10px;line-height:1.3;margin-top:3px}
 .chart .bar{height:44px;width:100%;display:grid;grid-template-columns:50px minmax(0,1fr) 37px;gap:6px;align-items:center;justify-content:normal;text-align:left}
 .chart .bar .tg{position:static;grid-column:1;grid-row:1;left:auto;top:auto;transform:none;text-align:left}
 .chart .bar .tg .tag{font-size:9px;padding:2px 4px}
 .chart .bar .v{grid-column:3;grid-row:1;font-size:12px;font-weight:650;text-align:right;margin:0}
 .chart .bar .f{grid-column:2;grid-row:1;width:var(--reuse);height:16px!important;min-width:2px;min-height:0;flex-direction:row;border-radius:2px}
 .chart .bar .f i{height:100%;width:auto}
 .chart .bar.none .v{grid-column:2/4;font-size:11px;font-weight:400;text-align:left;line-height:1.4}
 .chart .bar.none .tg .tag{font-size:9px}
 .chart .chart-change{margin-top:8px;padding-top:10px}
 .legend>.sep+span:has(.tag),.legend>span:has(.tag){display:none}
 .pv{--identity-height:92px}
 .pv .paper-toolbar{flex-wrap:nowrap;gap:10px;min-height:44px}
 .pv .paper-toolbar .exam-context{flex:1;width:auto;justify-content:space-between;gap:10px}
 .pv .paper-toolbar h1{font-size:13px;white-space:nowrap}
 .pv .exam-back{font-size:12px;min-height:44px}
 .view-settings{flex:none;margin-left:0}
 .view-settings>summary{display:flex;align-items:center;justify-content:center;gap:6px;min-width:52px;min-height:44px;cursor:pointer;font-size:13px;color:var(--ink);list-style:none}
 .view-settings>summary::-webkit-details-marker{display:none}
 .view-settings>summary::after{content:"+";color:var(--mut);font-size:16px}
 .view-settings[open]>summary::after{content:"−"}
 .settings-panel{position:absolute;right:0;top:100%;width:min(320px,calc(100vw - 32px));max-height:calc(100dvh - var(--site-height) - 70px);overflow:auto;overscroll-behavior:contain;padding:8px 16px 12px;background:var(--card);border:1px solid var(--line);border-radius:7px;box-shadow:0 8px 24px #0002;z-index:25}
 .paper-toolbar .paper-options{display:flex;flex-direction:column;align-items:stretch;width:auto;margin:0;gap:0}
 .paper-toolbar .verdict-help{width:100%;margin:0;font-size:14px}
 .paper-toolbar .verdict-help>summary{min-height:48px;justify-content:space-between;color:var(--ink)}
 .paper-toolbar .verdict-panel{position:static;width:auto;max-height:none;overflow:visible;padding:8px 0 12px;border:0;border-radius:0;box-shadow:none}
 .paper-toolbar .view-option{min-height:48px;gap:9px;font-size:14px}
 .paper-toolbar .view-option>svg{width:17px;height:17px}
 .paper-toolbar .view-option>i{display:block;margin-left:auto}
 .paper-toolbar .view-option:has(input:checked)::after{display:none}
 .mobile-questions{display:block;border-top:1px solid var(--line);margin-top:4px}
 .mobile-questions>summary{min-height:48px;display:flex;align-items:center;cursor:pointer;font-size:14px;color:var(--ink);list-style:none;justify-content:space-between}
 .mobile-questions>summary::-webkit-details-marker{display:none}
 .mobile-questions>summary::after{content:"+";color:var(--mut)}
 .mobile-questions[open]>summary::after{content:"−"}
 .mobile-questions .question-choices{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px;margin:4px 0 8px}
 .mobile-questions .tile{width:100%;height:48px}
 .mobile-questions .tile[aria-current]{outline:2px solid var(--ink);outline-offset:2px}
 .pv .strip{height:36px;margin-top:0}
 .pv .target-head,.pv .source-head{min-height:92px;padding:6px 0}
 .pv .paper-date{font-size:19px}
 .pop-more{display:flex;align-items:center;min-height:44px}
 .plist td:first-child a{display:inline-flex;align-items:center;min-height:28px}
 .top.menu-open .links{max-height:calc(100dvh - 55px);overflow:auto;overscroll-behavior:contain}
 .top.search-open .results{max-height:min(520px,calc(100dvh - 130px))}
 .research-downloads>summary{font-size:17px}
}
@media(min-width:721px){.view-settings>.settings-panel{display:block}.mobile-questions{display:none!important}}
@media print{.view-settings{display:none!important}}
.scan-zoom{position:relative;display:block;width:100%;padding:0;border:0;background:white;cursor:zoom-in;color:var(--mut);text-align:left}
.scan-zoom-hint{position:absolute;right:8px;bottom:8px;padding:4px 7px;background:rgba(250,250,247,.94);border:1px solid var(--line);border-radius:3px;font:500 11px/1.2 var(--sans);opacity:0;pointer-events:none}
.scan-zoom:hover .scan-zoom-hint,.scan-zoom:focus-visible .scan-zoom-hint{opacity:1}
.scan-viewer{position:fixed;inset:0;width:100vw;height:100dvh;max-width:none;max-height:none;margin:0;padding:0;border:0;background:var(--bg);color:var(--ink);overscroll-behavior:contain}
.scan-viewer[open]{display:flex;flex-direction:column}
.scan-viewer-toolbar{display:flex;align-items:center;justify-content:space-between;flex:none;gap:12px;padding:6px 16px;border-bottom:1px solid var(--line);background:var(--bg)}
.scan-viewer-toolbar h2{font:500 13px/1.4 var(--sans);margin:0;min-width:0;text-wrap:initial}
.scan-viewer-controls{display:flex;align-items:center;flex:none;gap:2px}
.scan-viewer-controls button{height:44px;width:44px;padding:0;border:0;background:none;font:400 24px/1 var(--sans);cursor:pointer;color:var(--ink)}
.scan-viewer-controls button:disabled{color:var(--faint);cursor:default}
.scan-viewer-controls output{min-width:44px;text-align:center;font-size:12px}
.scan-viewer-page{min-height:0;flex:1;overflow:auto;overscroll-behavior:contain;background:var(--soft)}
.scan-viewer-page img{display:block;width:100%;max-width:none;height:auto;margin:0 auto;background:white}
@media(max-width:720px){
 .scan-zoom-hint{opacity:1}
 .scan-viewer-toolbar{flex-wrap:wrap;gap:2px;padding:8px 12px 4px}
 .scan-viewer-toolbar h2{flex:1 0 100%;font-size:12px}
 .scan-viewer-controls{margin-left:auto}
}
@media print{.scan-zoom-hint{display:none!important}.scan-zoom{display:block!important}.scan-viewer{display:none!important}}
html:has(.scan-viewer[open]){overflow:hidden}
@media(max-width:720px){
 .chart .col .pair button.bar:focus-visible{outline-offset:1px}
 .research-downloads .ic{align-self:start;margin-top:2px}
}
.single-question-download{font-size:14px;color:var(--mut);margin-top:16px}
@media(max-width:720px){
 .prose.first>h1+h2{margin-top:24px}
}
/* In phone landscape, keep the evidence navigation fixed while the site masthead scrolls away. */
@media(min-width:500px) and (max-height:500px){
 .top{position:relative}
 .pv{--site-height:0px!important;--identity-height:76px}
 html:has(.pv){scroll-padding-top:0}
 .pv .target-head,.pv .source-head{min-height:76px;padding:4px 0}
 .pv .paper-date{font-size:22px}
 .pv .identity-top{min-height:17px;margin-bottom:2px}
 .pv .paper-code-copy{min-height:32px}
}
@media(max-width:720px){
 .settings-panel{width:min(320px,calc(100vw - 48px))}
 .chart .bar{grid-template-columns:50px minmax(0,1fr) 42px}
 .chart .bar .v{font-size:14px}
 .chart .bar .tg .tag,.chart .bar.none .tg .tag{font-size:10.5px}
}
/* 20 Oct: reuse since January 2021 */
.trend .tgraph{width:100%;height:auto;display:block;margin-top:6px;overflow:visible}
.tg-grid{stroke:var(--line);stroke-width:1}
.tg-ax{font:11px var(--sans);fill:var(--mut)}
.tg-val{font:600 11px var(--sans);fill:var(--ink)}
.tg-note{font:11px var(--sans);fill:var(--mut)}
.tg-line{stroke:var(--mut);stroke-dasharray:3 3}
.tg-gl{fill:#8c8a84}.tg-cn{fill:var(--v)}
.tg-key{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:5px;vertical-align:-1px}
.tg-key.gl{background:#8c8a84}.tg-key.cn{background:var(--v)}
@media (max-width:720px){.tg-ax{font-size:20px}.tg-val{font-size:17px}.tg-note{font-size:17px}}
.hero .standfirst.second{margin-top:-4px;color:var(--mut)}