/* Horvans public question bank + Examy practice - "Paper & Ink" (design judges, run 3).
   Loaded after hovarns-brand.css and platform.css; every rule is scoped under [data-site="platform"] (SITE-CONTRACT 2).
   Red only for the brand dot, focus, the current nav item and the Official-paper dot. Right = --ok, wrong = --bad.
   Subject colours are stripes and dots only, never text. */

[data-site="platform"][data-page^="tools-qbank"],[data-site="platform"][data-page="tools-examy-practice"]{
  --qp:#FAF8F3;--qp2:#F2EFE7;--sheet:#FFFEFB;--qi:#15171C;--qi2:#464A53;--qi3:#6B6E77;--qi4:#9A9DA5;
  --qr:rgba(21,23,28,.11);--qr2:rgba(21,23,28,.22);--ok:#1E6B47;--ok-w:#E6F1EA;--bad:#9F2D3A;--bad-w:#F8E7E9;--mark:#F4E6B5;
  --s-phy:#3D5A99;--s-chem:#2F7A5B;--s-bio:#A4573A;--s-math:#9A7414;
  --serif:"Newsreader","Iowan Old Style","Charter",Georgia,"Times New Roman",serif;--mono:ui-monospace,"SFMono-Regular","Cascadia Mono",Menlo,Consolas,monospace;
  --shadow:0 1px 0 rgba(21,23,28,.04),0 8px 24px -16px rgba(21,23,28,.18);--gut:clamp(16px,4vw,48px);
  --hz-ink-3:var(--qi3);--hz-rule:var(--qr);
  background:var(--qp);
}
[data-site="platform"][data-page^="tools-qbank"] body,[data-site="platform"][data-page="tools-examy-practice"] body{background:var(--qp)}
[data-site="platform"] .foot-cols .foot-h{margin:0 0 8px;font-size:.875rem;font-weight:600;color:rgba(255,255,255,.7);max-width:none}

/* ---------------- building blocks ---------------- */
[data-site="platform"] .qb{color:var(--qi)}
[data-site="platform"] .qb-wrap{width:100%;max-width:1240px;margin-inline:auto;padding-inline:var(--gut)}
[data-site="platform"] .qb-label{font-size:.75rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--qi3);margin:0 0 8px}
[data-site="platform"] .qb-mono{font-family:var(--mono);font-variant-numeric:tabular-nums}
[data-site="platform"] .qb-muted{color:var(--qi3)}
[data-site="platform"] .qb-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border-radius:999px;border:1px solid var(--qi);background:var(--qi);color:#fff;font:600 .9375rem/1 var(--f);text-decoration:none;cursor:pointer;white-space:nowrap}
[data-site="platform"] .qb-btn:hover{background:#000}
[data-site="platform"] .qb-btn-2{background:transparent;color:var(--qi);border-color:var(--qr2)}
[data-site="platform"] .qb-btn-2:hover{background:var(--sheet);border-color:var(--qi)}
[data-site="platform"] .qb-btn-q{background:transparent;color:var(--qi2);border-color:transparent;padding:0 10px;text-decoration:underline;text-underline-offset:4px;text-decoration-color:var(--qr2)}
[data-site="platform"] .qb-btn-q:hover{background:transparent;color:var(--qi)}
[data-site="platform"] .qb-btn[disabled],[data-site="platform"] .qb-btn[aria-disabled="true"]{opacity:.45;cursor:not-allowed}
[data-site="platform"] .qb-btn.sm{min-height:36px;padding:0 14px;font-size:.875rem}
[data-site="platform"] .qb-note{border:1px solid var(--qr2);border-left:3px solid var(--qi);background:var(--sheet);border-radius:8px;padding:14px 16px;margin:12px 0}
[data-site="platform"] .qb-note p{margin:0 0 8px;max-width:72ch}[data-site="platform"] .qb-note p:last-child{margin:0}
[data-site="platform"] .qb-field{display:grid;gap:6px;margin:0 0 14px}
[data-site="platform"] .qb-field>span{font-size:.8125rem;font-weight:600;color:var(--qi2)}
[data-site="platform"] .qb-in{width:100%;min-height:44px;padding:0 12px;border:1px solid var(--qr2);border-radius:8px;background:var(--sheet);color:var(--qi);font:400 1rem/1.3 var(--f)}
[data-site="platform"] select.qb-in{padding-right:28px}
[data-site="platform"] .qb-in:focus{border-color:var(--qi)}
[data-site="platform"] .qb-seg{display:flex;flex-wrap:wrap;border:1px solid var(--qr2);border-radius:999px;padding:3px;gap:2px;background:var(--sheet)}
[data-site="platform"] .qb-seg label{position:relative;flex:1 1 auto}
[data-site="platform"] .qb-seg input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
[data-site="platform"] .qb-seg span{display:flex;align-items:center;justify-content:center;min-height:38px;padding:0 12px;border-radius:999px;font-size:.875rem;font-weight:600;color:var(--qi2);white-space:nowrap}
[data-site="platform"] .qb-seg input:checked+span{background:var(--qi);color:#fff}
[data-site="platform"] .qb-seg input:focus-visible+span{outline:2px solid var(--red);outline-offset:2px}
[data-site="platform"] .qb-chip{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:0 12px;border:1px solid var(--qr2);border-radius:999px;background:var(--sheet);font-size:.875rem;font-weight:600;color:var(--qi);cursor:pointer;white-space:nowrap;text-decoration:none}
[data-site="platform"] .qb-chip[aria-pressed="true"]{background:var(--qi);color:#fff;border-color:var(--qi)}
[data-site="platform"] .qb-chip .x{font-size:1.1em;line-height:1;color:inherit;opacity:.7}
[data-site="platform"] .qb-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--qi3);flex:none}
[data-site="platform"] .qb-dot.phy{background:var(--s-phy)}[data-site="platform"] .qb-dot.chem{background:var(--s-chem)}[data-site="platform"] .qb-dot.bio{background:var(--s-bio)}[data-site="platform"] .qb-dot.math{background:var(--s-math)}
[data-site="platform"] .qb-dot.red{background:var(--red)}
[data-site="platform"] .qb-spin{display:inline-block;width:14px;height:14px;border:2px solid var(--qr2);border-top-color:var(--qi);border-radius:50%;animation:qbspin .8s linear infinite;vertical-align:-2px}
@keyframes qbspin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){[data-site="platform"] .qb-spin{animation:none}}
[data-site="platform"] .qb-vh{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------------- question card ---------------- */
[data-site="platform"] .qb-card{position:relative;background:var(--sheet);border:1px solid var(--qr);border-radius:14px;padding:18px 18px 14px 21px;box-shadow:var(--shadow);overflow:hidden}
[data-site="platform"] .qb-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--qi4)}
[data-site="platform"] .qb-card[data-subj="phy"]::before{background:var(--s-phy)}[data-site="platform"] .qb-card[data-subj="chem"]::before{background:var(--s-chem)}
[data-site="platform"] .qb-card[data-subj="bio"]::before{background:var(--s-bio)}[data-site="platform"] .qb-card[data-subj="math"]::before{background:var(--s-math)}
[data-site="platform"] .qb-tags{display:flex;flex-wrap:wrap;align-items:center;gap:6px 12px;font-size:.8125rem;color:var(--qi3);margin:0 0 6px}
[data-site="platform"] .qb-tags .n{font-family:var(--mono);color:var(--qi2)}
[data-site="platform"] .qb-tag{display:inline-flex;align-items:center;gap:6px;font-weight:600;color:var(--qi2)}
[data-site="platform"] .qb-where{font-size:.875rem;color:var(--qi2);margin:0 0 10px}
[data-site="platform"] .qb-stem{font-family:var(--serif);font-size:1.0625rem;line-height:1.55;color:var(--qi);margin:0 0 12px;max-width:none;overflow-wrap:anywhere}
@media (min-width:600px){[data-site="platform"] .qb-stem{font-size:1.1875rem}}
[data-site="platform"] .qb-img{max-width:100%;height:auto;border:1px solid var(--qr);border-radius:6px;background:#fff;margin:0 0 12px}
[data-site="platform"] .qb-opts{list-style:none;margin:0 0 10px;padding:0;display:grid;gap:8px}
@media (min-width:900px){[data-site="platform"] .qb-opts.short{grid-template-columns:1fr 1fr}}
[data-site="platform"] .qb-opt{display:flex;align-items:flex-start;gap:12px;width:100%;min-height:48px;padding:10px 12px;border:1px solid var(--qr2);border-radius:8px;background:var(--sheet);text-align:left;font-family:var(--serif);font-size:1.0625rem;line-height:1.45;color:var(--qi);cursor:pointer}
[data-site="platform"] button.qb-opt:hover{border-color:var(--qi)}
[data-site="platform"] div.qb-opt{cursor:default}
[data-site="platform"] .qb-opt .k{flex:none;display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:4px;border:1px solid var(--qr2);font:600 .8125rem/1 var(--mono);color:var(--qi2);background:var(--qp)}
[data-site="platform"] .qb-opt .t{flex:1;min-width:0;overflow-wrap:anywhere}
[data-site="platform"] .qb-opt .why{flex:none;font:600 .8125rem/1.6 var(--f)}
[data-site="platform"] .qb-opt.is-key{border-color:var(--ok);background:var(--ok-w)}
[data-site="platform"] .qb-opt.is-key .k{background:var(--ok);border-color:var(--ok);color:#fff}
[data-site="platform"] .qb-opt.is-key .why{color:var(--ok)}
[data-site="platform"] .qb-opt.is-wrong{border-color:var(--bad);background:var(--bad-w)}
[data-site="platform"] .qb-opt.is-wrong .k{background:var(--bad);border-color:var(--bad);color:#fff}
[data-site="platform"] .qb-opt.is-wrong .why{color:var(--bad)}
[data-site="platform"] .qb-opt.is-picked{border-color:var(--qi);box-shadow:inset 0 0 0 1px var(--qi)}
[data-site="platform"] .qb-opt.is-picked .k{background:var(--qi);border-color:var(--qi);color:#fff}
[data-site="platform"] .qb-sol{border-top:1px dashed var(--qr2);margin-top:6px;padding-top:10px}
[data-site="platform"] .qb-sol summary{display:inline-flex;align-items:center;min-height:44px;font-weight:600;cursor:pointer;list-style:none;text-decoration:underline;text-underline-offset:4px;text-decoration-color:var(--qr2)}
[data-site="platform"] .qb-sol summary::-webkit-details-marker{display:none}
[data-site="platform"] .qb-ans{font-weight:600;margin:4px 0 6px}
[data-site="platform"] .qb-expl{font-family:var(--serif);font-size:1rem;line-height:1.55;color:var(--qi2);margin:0 0 8px;white-space:pre-line;overflow-wrap:anywhere;max-width:none}
[data-site="platform"] .qb-acts{display:flex;flex-wrap:wrap;gap:8px 4px;align-items:center;margin-top:8px}
[data-site="platform"] .qb-credit{font-size:.8125rem;line-height:1.5;color:var(--qi3);margin:10px 0 0;padding-top:8px;border-top:1px solid var(--qr);max-width:none}
[data-site="platform"] .qb-nolink{display:inline}
[data-site="platform"] .qb-readonly{font-size:.875rem;color:var(--qi3);margin:0 0 8px}

/* ---------------- landing ---------------- */
[data-site="platform"] .qb-hero{padding-block:clamp(36px,6vw,88px) clamp(28px,4vw,56px)}
[data-site="platform"] .qb-hero-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(28px,5vw,64px)}
@media (min-width:1000px){[data-site="platform"] .qb-hero-grid{grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);align-items:center}}
[data-site="platform"] .qb-hero h1{margin:0;font-family:var(--serif);font-weight:500;font-size:clamp(2.4rem,5.2vw,4.25rem);line-height:1.02;letter-spacing:-.025em;max-width:15ch;text-wrap:balance;view-transition-name:site-title}
[data-site="platform"] .qb-hero h1 .stop{display:inline-block;width:.16em;height:.16em;margin-left:.04em;border-radius:50%;background:var(--red)}
[data-site="platform"] .qb-lede{margin:20px 0 0;font-size:clamp(1.0625rem,1.4vw,1.25rem);line-height:1.5;color:var(--qi2);max-width:56ch}
[data-site="platform"] .qb-lede b{color:var(--qi)}
[data-site="platform"] .qb-hero .acts{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
[data-site="platform"] .qb-facts{display:flex;flex-wrap:wrap;gap:6px 18px;margin:22px 0 0;padding:0;list-style:none;font-size:.875rem;color:var(--qi2)}
[data-site="platform"] .qb-facts li{display:flex;align-items:center;gap:8px}
[data-site="platform"] .qb-collage{position:relative;min-height:340px;margin:0}
[data-site="platform"] .qb-collage .qb-card{transform:rotate(-1.5deg);max-width:520px;margin-inline:auto}
[data-site="platform"] .qb-sample{position:absolute;background:var(--sheet);border:1px solid var(--qr);border-radius:14px;box-shadow:var(--shadow);padding:12px 14px;font-size:.8125rem;color:var(--qi2)}
[data-site="platform"] .qb-sample b{display:block;font:600 1.5rem/1.1 var(--mono);color:var(--qi);font-variant-numeric:tabular-nums}
[data-site="platform"] .qb-sample.t{right:0;top:-14px;transform:rotate(2deg)}
[data-site="platform"] .qb-sample.r{left:0;bottom:-18px;transform:rotate(-2deg)}
[data-site="platform"] .qb-tagline{position:absolute;left:50%;bottom:-46px;transform:translateX(-50%);font-size:.75rem;color:var(--qi3);white-space:nowrap}
@media (max-width:640px){[data-site="platform"] .qb-sample{display:none}[data-site="platform"] .qb-collage{min-height:0}[data-site="platform"] .qb-tagline{position:static;transform:none;display:block;text-align:center;margin-top:10px;white-space:normal}}
[data-site="platform"] .qb-sec{padding-block:clamp(44px,6vw,88px);border-top:1px solid var(--qr)}
[data-site="platform"] .qb-sec h2{margin:0 0 12px;font-family:var(--serif);font-weight:500;font-size:clamp(1.6rem,2.6vw,2.2rem);line-height:1.1;letter-spacing:-.02em;max-width:24ch}
[data-site="platform"] .qb-sec>.qb-wrap>p{color:var(--qi2);max-width:62ch}
[data-site="platform"] .qb-cols{display:grid;gap:16px;margin-top:22px}
@media (min-width:800px){[data-site="platform"] .qb-cols{grid-template-columns:repeat(2,minmax(0,1fr))}[data-site="platform"] .qb-cols.three{grid-template-columns:repeat(3,minmax(0,1fr))}}
[data-site="platform"] .qb-panel{background:var(--sheet);border:1px solid var(--qr);border-radius:14px;padding:20px}
[data-site="platform"] .qb-panel h3{margin:0 0 8px;font-size:1.0625rem}
[data-site="platform"] .qb-panel ul{margin:0;padding-left:18px;color:var(--qi2)}
[data-site="platform"] .qb-panel li{margin:4px 0}
[data-site="platform"] .qb-panel p{color:var(--qi2);margin:0 0 8px}
[data-site="platform"] .qb-num{font:600 clamp(1.8rem,3.2vw,2.6rem)/1 var(--mono);font-variant-numeric:tabular-nums;color:var(--qi);margin:0 0 6px}
[data-site="platform"] .qb-steps{counter-reset:s;list-style:none;margin:20px 0 0;padding:0;display:grid;gap:14px}
@media (min-width:800px){[data-site="platform"] .qb-steps{grid-template-columns:repeat(3,minmax(0,1fr))}}
[data-site="platform"] .qb-steps li{counter-increment:s;background:var(--sheet);border:1px solid var(--qr);border-radius:14px;padding:18px}
[data-site="platform"] .qb-steps li::before{content:counter(s);display:inline-flex;width:28px;height:28px;align-items:center;justify-content:center;border-radius:50%;border:1px solid var(--qi);font:600 .875rem/1 var(--mono);margin-bottom:10px}
[data-site="platform"] .qb-steps h3{margin:0 0 6px;font-size:1.0625rem}
[data-site="platform"] .qb-steps p{margin:0;color:var(--qi2)}
[data-site="platform"] .qb-faq{margin-top:18px;border-top:1px solid var(--qr2)}
[data-site="platform"] .qb-faq details{border-bottom:1px solid var(--qr)}
[data-site="platform"] .qb-faq summary{display:flex;align-items:center;min-height:56px;font-weight:600;cursor:pointer;padding-right:28px;position:relative}
[data-site="platform"] .qb-faq summary::after{content:"+";position:absolute;right:4px;font:400 1.4rem/1 var(--mono);color:var(--qi3)}
[data-site="platform"] .qb-faq details[open] summary::after{content:"–"}
[data-site="platform"] .qb-faq p{color:var(--qi2);margin:0 0 16px}
[data-site="platform"] .qb-crumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;margin:0 0 16px;padding:0;font-size:.875rem;color:var(--qi3)}
[data-site="platform"] .qb-crumbs li+li::before{content:"/";margin-right:6px;color:var(--qi4)}
[data-site="platform"] .qb-crumbs a{text-decoration:none}[data-site="platform"] .qb-crumbs a:hover{text-decoration:underline}

/* ---------------- browse ---------------- */
[data-site="platform"] .qb-browse{padding-block:16px 120px}
[data-site="platform"] .qb-top{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin-bottom:14px}
[data-site="platform"] .qb-top h1{margin:0;font-family:var(--serif);font-weight:500;font-size:clamp(1.5rem,2.6vw,2.2rem);letter-spacing:-.02em;line-height:1.1;view-transition-name:site-title}
[data-site="platform"] .qb-search{display:flex;flex:1 1 320px;gap:8px;min-width:0}
[data-site="platform"] .qb-search .qb-in{border-radius:999px;padding:0 18px}
[data-site="platform"] .qb-kbd{font:600 .75rem/1 var(--mono);border:1px solid var(--qr2);border-radius:4px;padding:3px 6px;color:var(--qi3)}
[data-site="platform"] .qb-grid{display:grid;gap:20px}
@media (min-width:900px){[data-site="platform"] .qb-grid{grid-template-columns:232px minmax(0,1fr);align-items:start}}
[data-site="platform"] .qb-filters{background:var(--sheet);border:1px solid var(--qr);border-radius:14px;padding:16px}
@media (min-width:900px){[data-site="platform"] .qb-filters{position:sticky;top:72px;max-height:calc(100vh - 88px);overflow:auto}}
@media (max-width:899.98px){
  [data-site="platform"] .qb-filters{display:none}
  [data-site="platform"] .qb-filters.open{display:block;position:fixed;inset:auto 0 0 0;max-height:82vh;overflow:auto;z-index:70;border-radius:14px 14px 0 0;box-shadow:0 -16px 40px -12px rgba(21,23,28,.35)}
}
[data-site="platform"] .qb-filters h2{margin:0 0 12px;font-size:1rem}
[data-site="platform"] .qb-filter-close{display:none}
@media (max-width:899.98px){[data-site="platform"] .qb-filter-close{display:inline-flex}}
[data-site="platform"] .qb-scope{font-size:.8125rem;line-height:1.5;color:var(--qi3);margin:14px 0 0;max-width:none}
[data-site="platform"] .qb-chiprow{display:flex;gap:8px;overflow-x:auto;padding:2px 0 10px;scrollbar-width:none}
[data-site="platform"] .qb-chiprow::-webkit-scrollbar{display:none}
@media (min-width:900px){[data-site="platform"] .qb-chiprow .qb-only-m{display:none}}
[data-site="platform"] .qb-reshead{display:flex;flex-wrap:wrap;align-items:center;gap:8px 16px;margin:0 0 12px}
[data-site="platform"] .qb-count{font-weight:600;margin:0}
[data-site="platform"] .qb-scopepill{font-size:.75rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--qi3);border:1px solid var(--qr2);border-radius:999px;padding:4px 10px}
[data-site="platform"] .qb-list{list-style:none;margin:0;padding:0;display:grid;gap:14px}
[data-site="platform"] .qb-moreb{display:flex;justify-content:center;margin:18px 0}
[data-site="platform"] .qb-tray{position:fixed;left:50%;bottom:max(14px,env(safe-area-inset-bottom));transform:translateX(-50%);z-index:60;display:flex;align-items:center;gap:8px;padding:6px 6px 6px 16px;background:var(--qi);color:#fff;border-radius:999px;box-shadow:0 12px 30px -10px rgba(21,23,28,.5);max-width:calc(100vw - 24px)}
[data-site="platform"] .qb-tray[hidden]{display:none}
[data-site="platform"] .qb-tray .c{font-weight:600;white-space:nowrap;font-size:.9375rem}
[data-site="platform"] .qb-tray .qb-btn{background:#fff;color:var(--qi);border-color:#fff}
[data-site="platform"] .qb-tray .qb-btn-2{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
[data-site="platform"] .qb-skel{height:180px;border-radius:14px;background:linear-gradient(90deg,var(--qp2),var(--sheet),var(--qp2));background-size:200% 100%;animation:qbsk 1.2s ease-in-out infinite}
@keyframes qbsk{to{background-position:-200% 0}}
@media (prefers-reduced-motion:reduce){[data-site="platform"] .qb-skel{animation:none}}

/* ---------------- practice ---------------- */
[data-site="platform"] .px{padding-block:20px 120px}
[data-site="platform"] .px h1{margin:0 0 6px;font-family:var(--serif);font-weight:500;font-size:clamp(1.7rem,3vw,2.5rem);letter-spacing:-.02em;line-height:1.08;view-transition-name:site-title}
[data-site="platform"] .px-presets{display:grid;gap:12px;margin:18px 0}
@media (min-width:760px){[data-site="platform"] .px-presets{grid-template-columns:repeat(3,minmax(0,1fr))}}
[data-site="platform"] .px-preset{position:relative;display:block;background:var(--sheet);border:1px solid var(--qr2);border-radius:14px;padding:16px;cursor:pointer}
[data-site="platform"] .px-preset input{position:absolute;opacity:0}
[data-site="platform"] .px-preset b{display:block;font-size:1.0625rem}
[data-site="platform"] .px-preset .m{display:block;font:600 1.4rem/1.2 var(--mono);margin:6px 0}
[data-site="platform"] .px-preset small{display:block;color:var(--qi3);font-size:.8125rem;line-height:1.45}
[data-site="platform"] .px-preset:has(input:checked){border-color:var(--qi);box-shadow:inset 0 0 0 1px var(--qi)}
[data-site="platform"] .px-preset:has(input:focus-visible){outline:2px solid var(--red);outline-offset:2px}
[data-site="platform"] .px-opts{display:grid;gap:4px 18px;background:var(--sheet);border:1px solid var(--qr);border-radius:14px;padding:16px;margin:0 0 16px}
@media (min-width:760px){[data-site="platform"] .px-opts{grid-template-columns:repeat(2,minmax(0,1fr))}}
[data-site="platform"] .px-opts fieldset{border:0;margin:0 0 10px;padding:0;min-width:0}
[data-site="platform"] .px-opts legend{font-size:.8125rem;font-weight:600;color:var(--qi2);margin-bottom:6px;padding:0}
[data-site="platform"] .px-resume{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;background:var(--mark);border:1px solid rgba(21,23,28,.18);border-radius:14px;padding:12px 16px;margin:0 0 16px}
[data-site="platform"] .px-resume p{margin:0;flex:1 1 240px}
[data-site="platform"] .px-progress{height:6px;background:var(--qp2);border-radius:3px;overflow:hidden;margin:10px 0}
[data-site="platform"] .px-progress i{display:block;height:100%;background:var(--qi);width:0;transition:width .2s}

/* the test: one question per screen, sticky action bar, palette sheet. No ads (body[data-no-ads]). */
[data-site="platform"] .px-run{max-width:860px;margin-inline:auto}
[data-site="platform"] .px-head{position:sticky;top:56px;z-index:30;display:flex;align-items:center;gap:10px;padding:10px 0;background:var(--qp);border-bottom:1px solid var(--qr)}
[data-site="platform"] .px-head .ttl{flex:1;min-width:0;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
[data-site="platform"] .px-timer{font:600 1.0625rem/1 var(--mono);font-variant-numeric:tabular-nums;padding:8px 12px;border:1px solid var(--qr2);border-radius:999px;background:var(--sheet);white-space:nowrap}
[data-site="platform"] .px-timer.low{border-color:var(--qi);box-shadow:inset 0 0 0 1px var(--qi)}
[data-site="platform"] .px-off{font-size:.75rem;font-weight:600;border:1px dashed var(--qi);border-radius:999px;padding:5px 10px;white-space:nowrap}
[data-site="platform"] .px-q{margin:16px 0}
[data-site="platform"] .px-q fieldset{border:0;margin:0;padding:0;min-width:0}
[data-site="platform"] .px-q legend{padding:0;margin:0 0 12px;width:100%}
[data-site="platform"] .px-q .qb-opt{min-height:52px}
[data-site="platform"] .px-q .qb-opt input{position:absolute;opacity:0;width:1px;height:1px}
[data-site="platform"] .px-q label.qb-opt{position:relative}
[data-site="platform"] .px-q label.qb-opt:has(input:focus-visible){outline:2px solid var(--red);outline-offset:2px}
[data-site="platform"] .px-q label.qb-opt:has(input:checked){border-color:var(--qi);box-shadow:inset 0 0 0 1px var(--qi)}
[data-site="platform"] .px-q label.qb-opt:has(input:checked) .k{background:var(--qi);border-color:var(--qi);color:#fff}
[data-site="platform"] .px-feedback{margin:12px 0 0}
[data-site="platform"] .px-bar{position:sticky;bottom:0;z-index:30;display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:10px 0 max(10px,env(safe-area-inset-bottom));background:var(--qp);border-top:1px solid var(--qr)}
[data-site="platform"] .px-bar .sp{flex:1}
[data-site="platform"] .px-pal{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:6px}
[data-site="platform"] .px-pal button{position:relative;width:100%;height:44px;border:1px solid var(--qr2);border-radius:6px;background:var(--sheet);font:600 .875rem/1 var(--mono);color:var(--qi);cursor:pointer}
[data-site="platform"] .px-pal button[data-s="a"]{background:var(--qi);border-color:var(--qi);color:#fff}
[data-site="platform"] .px-pal button[data-s="m"],[data-site="platform"] .px-pal button[data-s="am"]{border-radius:50%;background:var(--mark);border-color:var(--qi)}
[data-site="platform"] .px-pal button[data-s="am"]{background:var(--qi);color:#fff}
[data-site="platform"] .px-pal button[data-s="am"]::after{content:"";position:absolute;right:1px;top:1px;width:10px;height:10px;border-radius:50%;background:var(--mark);border:1.5px solid var(--qi)}
[data-site="platform"] .px-pal button[aria-current="true"]{outline:2px solid var(--red);outline-offset:2px}
[data-site="platform"] .px-legend{display:flex;flex-wrap:wrap;gap:6px 14px;list-style:none;margin:12px 0 0;padding:0;font-size:.8125rem;color:var(--qi2)}
[data-site="platform"] .px-legend li{display:flex;align-items:center;gap:6px}
[data-site="platform"] .px-legend i{width:16px;height:16px;border:1px solid var(--qr2);border-radius:4px;background:var(--sheet)}
[data-site="platform"] .px-legend i[data-s="a"]{background:var(--qi);border-color:var(--qi)}
[data-site="platform"] .px-legend i[data-s="m"]{border-radius:50%;background:var(--mark);border-color:var(--qi)}
[data-site="platform"] dialog.qb-sheet{border:0;padding:0;margin:auto auto 0;width:100%;max-width:860px;max-height:85vh;border-radius:14px 14px 0 0;background:var(--sheet);color:var(--qi);box-shadow:0 -16px 40px -12px rgba(21,23,28,.35)}
@media (min-width:760px){[data-site="platform"] dialog.qb-sheet{margin:auto;border-radius:14px;max-width:640px}}
[data-site="platform"] dialog.qb-sheet::backdrop{background:rgba(21,23,28,.4)}
[data-site="platform"] .qb-sheet-in{padding:18px}
[data-site="platform"] .qb-sheet-head{display:flex;align-items:center;gap:10px;margin:0 0 12px}
[data-site="platform"] .qb-sheet-head h2{margin:0;flex:1;font-size:1.125rem}

/* result */
[data-site="platform"] .px-score{display:flex;flex-wrap:wrap;align-items:flex-end;gap:8px 24px;background:var(--sheet);border:1px solid var(--qr);border-radius:14px;padding:20px;margin:14px 0}
[data-site="platform"] .px-score .big{font:600 clamp(2.4rem,6vw,3.6rem)/1 var(--mono);font-variant-numeric:tabular-nums}
[data-site="platform"] .px-score .of{font:600 1.25rem/1 var(--mono);color:var(--qi3)}
[data-site="platform"] .px-stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:0 0 16px;list-style:none;padding:0}
@media (min-width:760px){[data-site="platform"] .px-stats{grid-template-columns:repeat(5,minmax(0,1fr))}}
[data-site="platform"] .px-stats li{background:var(--sheet);border:1px solid var(--qr);border-radius:10px;padding:10px 12px}
[data-site="platform"] .px-stats b{display:block;font:600 1.4rem/1.1 var(--mono)}
[data-site="platform"] .px-stats span{font-size:.8125rem;color:var(--qi3)}
[data-site="platform"] .px-chaps{list-style:none;margin:0 0 18px;padding:0;display:grid;gap:8px}
[data-site="platform"] .px-chaps li{display:grid;grid-template-columns:minmax(0,1fr) 120px 64px;gap:10px;align-items:center;font-size:.9375rem}
[data-site="platform"] .px-chaps .bar{height:8px;border-radius:4px;background:var(--qp2);overflow:hidden}
[data-site="platform"] .px-chaps .bar i{display:block;height:100%;background:var(--qi)}
[data-site="platform"] .px-chaps .v{font-family:var(--mono);text-align:right;color:var(--qi2)}
[data-site="platform"] .px-filter{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0 14px}
[data-site="platform"] .px-review{list-style:none;margin:0;padding:0;display:grid;gap:14px}
[data-site="platform"] .px-acts{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}

/* ---------------- paper ---------------- */
[data-site="platform"] .pp{padding-block:20px 80px}
[data-site="platform"] .pp h1{margin:0 0 6px;font-family:var(--serif);font-weight:500;font-size:clamp(1.7rem,3vw,2.5rem);letter-spacing:-.02em;view-transition-name:site-title}
[data-site="platform"] .pp-grid{display:grid;gap:20px}
@media (min-width:980px){[data-site="platform"] .pp-grid{grid-template-columns:minmax(0,1fr) 320px;align-items:start}}
[data-site="platform"] .pp-side{background:var(--sheet);border:1px solid var(--qr);border-radius:14px;padding:16px}
@media (min-width:980px){[data-site="platform"] .pp-side{position:sticky;top:72px}}
[data-site="platform"] .pp-list{list-style:none;margin:0;padding:0;display:grid;gap:10px;counter-reset:pq}
[data-site="platform"] .pp-item{display:grid;grid-template-columns:32px minmax(0,1fr) auto;gap:10px;align-items:start;background:var(--sheet);border:1px solid var(--qr);border-radius:10px;padding:10px 12px}
[data-site="platform"] .pp-item .n{font:600 .875rem/1.8 var(--mono);color:var(--qi2)}
[data-site="platform"] .pp-item .s{font-family:var(--serif);font-size:1rem;line-height:1.45;overflow-wrap:anywhere}
[data-site="platform"] .pp-item .w{font-size:.8125rem;color:var(--qi3);margin-top:2px}
[data-site="platform"] .pp-item .b{display:flex;gap:4px}
[data-site="platform"] .pp-item .b button{min-width:44px;min-height:44px;border:1px solid var(--qr2);border-radius:8px;background:var(--sheet);cursor:pointer;font-size:1rem;color:var(--qi)}
[data-site="platform"] .pp-item .b button[disabled]{opacity:.35;cursor:default}
[data-site="platform"] .pp-saved{list-style:none;margin:0;padding:0;display:grid;gap:8px}
[data-site="platform"] .pp-saved li{display:flex;flex-wrap:wrap;gap:6px;align-items:center;border-top:1px solid var(--qr);padding-top:8px}
[data-site="platform"] .pp-saved li span{flex:1 1 140px;font-weight:600}
[data-site="platform"] .pp-print{display:none}

@media print{
  [data-site="platform"] #site-bar,[data-site="platform"] #site-foot,[data-site="platform"] .skip,[data-site="platform"] .pp-screen,[data-site="platform"] .qb-tray,[data-site="platform"] .hz-ad{display:none!important}
  [data-site="platform"],[data-site="platform"] body{background:#fff!important}
  [data-site="platform"] .pp-print{display:block;color:#000;font-family:var(--serif);font-size:11pt;line-height:1.4}
  [data-site="platform"] .pp-print .sheet{break-after:page}
  [data-site="platform"] .pp-print .sheet:last-child{break-after:auto}
  [data-site="platform"] .pp-print header{border-bottom:1.5pt solid #000;padding-bottom:6pt;margin-bottom:10pt}
  [data-site="platform"] .pp-print header h1{font-size:15pt;margin:0 0 4pt;font-weight:600}
  [data-site="platform"] .pp-print header p{margin:0;font-size:10pt;max-width:none}
  [data-site="platform"] .pp-print ol.qs{margin:0;padding-left:22pt}
  [data-site="platform"] .pp-print.two ol.qs{columns:2;column-gap:18pt}
  [data-site="platform"] .pp-print.large{font-size:14pt}
  [data-site="platform"] .pp-print ol.qs>li{break-inside:avoid;margin:0 0 9pt}
  [data-site="platform"] .pp-print ol.o{list-style:none;margin:3pt 0 0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:2pt 12pt}
  [data-site="platform"] .pp-print ol.o.long{grid-template-columns:1fr}
  [data-site="platform"] .pp-print .key{break-before:page}
  [data-site="platform"] .pp-print table{border-collapse:collapse;width:100%;font-family:var(--mono);font-size:10pt}
  [data-site="platform"] .pp-print td,[data-site="platform"] .pp-print th{border:.5pt solid #000;padding:2pt 4pt;text-align:left}
  [data-site="platform"] .pp-print .credits{break-before:page;font-size:9pt}
  [data-site="platform"] .pp-print .credits li{margin:0 0 2pt}
  [data-site="platform"] .pp-print img{max-width:60%;max-height:2.2in}
  @page{margin:14mm}
}

[data-site="platform"] .qb-block{display:block}[data-site="platform"] .qb-m0{margin:0}[data-site="platform"] .qb-small{font-size:.875rem}[data-site="platform"] .qb-mt6{margin:6px 0 0}[data-site="platform"] .qb-mt8{margin-top:8px}[data-site="platform"] .qb-plain{border:0;margin:0;padding:0;min-width:0}
[data-site="platform"] .qb-filters .qb-seg{display:grid;grid-template-columns:1fr 1fr;border-radius:12px}[data-site="platform"] .qb-filters .qb-seg span{border-radius:9px;padding:0 8px}
[data-site="platform"] .m-examy .pal .h6{display:block;grid-column:1/-1;margin:0 0 4px;font-size:10.5px;font-weight:700}
[data-site="platform"][data-page="tools-examy"] .qb-faq{--qr:rgba(11,15,25,.14);--qr2:rgba(11,15,25,.3);--qi2:#454A57;--qi3:#6B707C;--mono:ui-monospace,Menlo,Consolas,monospace;max-width:860px}
[data-site="platform"] .qb-hp{position:absolute!important;left:-9999px;width:1px;height:1px;overflow:hidden}[data-site="platform"] .qb-ta{min-height:96px;padding:10px 12px;resize:vertical}