/* ==========================================================================
   PrayogX — JEE Advanced Interactive Simulation Library — website styles
   Discovery / navigation layer only. Simulations own their own styling.
   Tokens match the simulation house style so the whole library reads as one product.
   ========================================================================== */

:root{
  color-scheme: light;
  --surface-0:#f4f4f1; --surface-1:#fcfcfb; --surface-2:#ececea;
  --line:#d9d9d4; --line-strong:#bcbcb5;
  --text-primary:#0b0b0b; --text-secondary:#52514e; --text-muted:#77766f;
  --s1:#2a78d6; --s2:#eb6834; --s3:#1baf7a; --s4:#4a3aa7;
  --good:#00743f; --accent:#2a78d6;
  --subj-physics:#eb6834; --subj-chemistry:#1baf7a; --subj-mathematics:#4a3aa7; --subj-other:#2a78d6;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  --sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --serif:ui-serif,Georgia,"Times New Roman",serif;
  --radius:12px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  color-scheme: dark;
  --surface-0:#111110; --surface-1:#1a1a19; --surface-2:#232322;
  --line:#34342f; --line-strong:#4a4a44;
  --text-primary:#ffffff; --text-secondary:#c3c2b7; --text-muted:#95948b;
  --s1:#3987e5; --s2:#d95926; --s3:#199e70; --s4:#9085e9;
  --good:#3fae7a; --accent:#3987e5;
  --subj-physics:#d95926; --subj-chemistry:#199e70; --subj-mathematics:#9085e9; --subj-other:#3987e5;
}}
:root[data-theme="dark"]{
  color-scheme: dark;
  --surface-0:#111110; --surface-1:#1a1a19; --surface-2:#232322;
  --line:#34342f; --line-strong:#4a4a44;
  --text-primary:#ffffff; --text-secondary:#c3c2b7; --text-muted:#95948b;
  --s1:#3987e5; --s2:#d95926; --s3:#199e70; --s4:#9085e9;
  --good:#3fae7a; --accent:#3987e5;
  --subj-physics:#d95926; --subj-chemistry:#199e70; --subj-mathematics:#9085e9; --subj-other:#3987e5;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--surface-0);color:var(--text-primary);font-family:var(--sans);
  font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}
.inner{max-width:1160px;margin:0 auto;padding:0 20px}
a{color:var(--accent)}

/* ---------- header ---------- */
.site-head{background:var(--surface-1);border-bottom:1px solid var(--line)}
.site-head .inner{display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding-top:20px;padding-bottom:18px}
.brand{text-decoration:none;color:inherit;display:flex;align-items:center;gap:12px;min-width:0}
.brand .pxmark{width:40px;height:40px;flex:none;display:block}
.brand-text{display:block;min-width:0}
.brand-title{display:block;font-size:27px;font-weight:800;line-height:1.05;letter-spacing:.10em}
.brand-title i{font-style:normal;color:var(--accent)}
.brand-kicker{display:block;font-size:11.5px;font-weight:600;letter-spacing:.13em;
  text-transform:uppercase;color:var(--text-muted);margin-top:4px}
.themebtn{border:1px solid var(--line-strong);background:var(--surface-2);color:var(--text-secondary);
  border-radius:8px;padding:6px 11px;font-size:12.5px;cursor:pointer;font-family:var(--sans);flex:none}
.themebtn:hover{border-color:var(--accent);color:var(--accent)}

main{padding:22px 0 64px}
.loading{color:var(--text-muted);padding:40px 0;text-align:center}

/* ---------- counts strip ---------- */
.counts{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.count{background:var(--surface-1);border:1px solid var(--line);border-radius:10px;padding:9px 14px;
  display:flex;align-items:baseline;gap:8px;min-width:0}
.count .n{font-family:var(--mono);font-size:19px;font-weight:700;line-height:1}
.count .k{font-size:12px;color:var(--text-muted);white-space:nowrap}
.count.total{border-color:var(--line-strong)}
.count.subj .n{color:var(--c)}
.count.subj .swatch{width:9px;height:9px;border-radius:50%;background:var(--c);flex:none;align-self:center}

/* ---------- filters ---------- */
.filters{background:var(--surface-1);border:1px solid var(--line);border-radius:var(--radius);
  padding:14px;margin-bottom:18px}
.filters .searchrow{display:flex;gap:10px;margin-bottom:10px}
.filters input[type=search]{flex:1;min-width:0;padding:11px 14px;border-radius:9px;
  border:1px solid var(--line-strong);background:var(--surface-0);color:var(--text-primary);
  font-size:15px;font-family:var(--sans)}
.filters input[type=search]:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:var(--accent)}
.selects{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.field{display:flex;flex-direction:column;gap:4px;min-width:0}
.field label{font-size:11px;letter-spacing:.07em;text-transform:uppercase;color:var(--text-muted)}
.field select{width:100%;padding:9px 10px;border-radius:9px;border:1px solid var(--line-strong);
  background:var(--surface-0);color:var(--text-primary);font-size:14px;font-family:var(--sans)}
.field select:disabled{opacity:.5}
.btn{padding:10px 16px;border-radius:9px;border:1px solid var(--line-strong);background:var(--surface-2);
  color:var(--text-primary);font-size:14px;cursor:pointer;font-family:var(--sans);flex:none}
.btn:hover{border-color:var(--accent);color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
.btn.primary:hover{color:#fff;opacity:.92}

.resultline{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:0 0 14px;
  font-size:13.5px;color:var(--text-secondary)}
.activefilters{display:flex;flex-wrap:wrap;gap:6px}
.pill{font-size:12px;padding:3px 10px;border-radius:999px;border:1px solid var(--accent);
  color:var(--accent);background:transparent;cursor:pointer;font-family:var(--sans)}
.pill:hover{background:var(--accent);color:#fff}

/* ---------- cards ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:14px}
.card{background:var(--surface-1);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 16px 14px;display:flex;flex-direction:column;gap:0;
  border-top:3px solid var(--c,var(--line-strong));transition:border-color .12s,transform .12s,box-shadow .12s}
.card:hover{border-color:var(--line-strong);border-top-color:var(--c,var(--line-strong));
  transform:translateY(-2px);box-shadow:0 6px 18px rgba(0,0,0,.07)}
.card .exam{font-size:10.5px;font-weight:700;letter-spacing:.18em;color:var(--text-muted)}
.card .where{font-size:12px;color:var(--text-secondary);font-family:var(--mono);margin-top:3px}
.card .subject{display:inline-block;margin-top:8px;font-size:11px;font-weight:700;letter-spacing:.12em;
  color:var(--c);border:1px solid var(--c);border-radius:999px;padding:2px 10px}
.card .qno{margin-top:10px;font-size:12.5px;color:var(--text-muted);font-weight:600}
.card h3{margin:2px 0 10px;font-size:16px;line-height:1.35;font-weight:620}
.card h3 a{color:inherit;text-decoration:none}
.card h3 a:hover{color:var(--accent)}
.card dl{margin:0 0 10px;display:grid;grid-template-columns:auto 1fr;gap:2px 10px;font-size:13px}
.card dt{color:var(--text-muted);font-size:12px}
.card dd{margin:0;color:var(--text-secondary)}
.card .tags{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:14px}
.card .tag{font-size:11px;padding:2px 9px;border-radius:999px;background:var(--surface-2);
  border:1px solid var(--line);color:var(--text-secondary);cursor:pointer}
.card .tag:hover{border-color:var(--accent);color:var(--accent)}
.card .foot{margin-top:auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.card .open{flex:1;text-align:center;text-decoration:none;padding:10px 14px;border-radius:9px;
  background:var(--accent);color:#fff;font-size:13px;font-weight:700;letter-spacing:.06em}
.card .open:hover{opacity:.92}
.card .simid{font-family:var(--mono);font-size:10.5px;color:var(--text-muted);letter-spacing:.04em}

.empty{text-align:center;padding:50px 20px;color:var(--text-muted)}
.empty h3{color:var(--text-primary);font-size:17px;margin:0 0 6px}
.error{border:1px solid var(--s2);border-radius:var(--radius);padding:18px;background:var(--surface-1)}
.error h3{margin:0 0 8px;color:var(--s2);font-size:16px}
.error code{font-family:var(--mono);font-size:12.5px;background:var(--surface-2);padding:1px 5px;border-radius:4px}

/* ---------- detail view ---------- */
.back{display:inline-block;margin-bottom:14px;font-size:13.5px;text-decoration:none;color:var(--text-secondary)}
.back:hover{color:var(--accent)}
.detail{background:var(--surface-1);border:1px solid var(--line);border-radius:var(--radius);
  border-top:3px solid var(--c,var(--line-strong));padding:22px}
.detail .exam{font-size:10.5px;font-weight:700;letter-spacing:.18em;color:var(--text-muted)}
.detail h1{margin:8px 0 10px;font-size:24px;line-height:1.25;font-weight:650}
.detail .chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.detail .chip{font-size:11.5px;padding:3px 10px;border-radius:999px;border:1px solid var(--line-strong);
  color:var(--text-secondary);background:var(--surface-2)}
.detail .chip.subj{border-color:var(--c);color:var(--c);background:transparent;font-weight:600}
.detail .summary{font-size:15px;color:var(--text-secondary);max-width:74ch;margin:0 0 18px}
.detail .cta{display:inline-block;text-decoration:none;padding:13px 26px;border-radius:10px;
  background:var(--accent);color:#fff;font-size:14.5px;font-weight:700;letter-spacing:.05em}
.detail .cta:hover{opacity:.92}
.detail .ctarow{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-bottom:22px}
.detail .ctanote{font-size:12.5px;color:var(--text-muted)}
.detail .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}
.detail h2{font-size:12px;letter-spacing:.07em;text-transform:uppercase;color:var(--text-muted);
  font-weight:600;margin:0 0 8px}
.detail dl.meta{margin:0;font-size:13.5px}
.detail dl.meta div{display:flex;gap:12px;padding:5px 0;border-bottom:1px solid var(--line)}
.detail dl.meta dt{color:var(--text-muted);font-size:12.5px;min-width:104px;flex:none}
.detail dl.meta dd{margin:0;text-align:right;margin-left:auto}
.detail ul.plain{margin:0;padding-left:18px;font-size:13.5px;color:var(--text-secondary)}
.detail ul.plain li{margin-bottom:4px}
.detail .taglist{display:flex;flex-wrap:wrap;gap:5px;margin-top:14px}
.detail .taglist a{font-size:11.5px;padding:2px 10px;border-radius:999px;background:var(--surface-2);
  border:1px solid var(--line);color:var(--text-secondary);text-decoration:none}
.detail .taglist a:hover{border-color:var(--accent);color:var(--accent)}
.detail .idline{margin-top:18px;font-family:var(--mono);font-size:11px;color:var(--text-muted)}

/* ---------- footer ---------- */
.site-foot{border-top:1px solid var(--line);background:var(--surface-1)}
.site-foot .inner{padding-top:16px;padding-bottom:20px;font-size:12px;color:var(--text-muted);
  display:flex;flex-wrap:wrap;gap:6px}
.site-foot code{font-family:var(--mono)}
.dot{opacity:.5}

/* ---------- responsive ---------- */
@media (max-width:820px){
  .selects{grid-template-columns:repeat(2,minmax(0,1fr))}
  .brand-title{font-size:23px}
  .brand .pxmark{width:34px;height:34px}
  .site-head .inner{padding-top:16px;padding-bottom:14px}
}
@media (max-width:560px){
  .inner{padding:0 14px}
  .selects{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr}
  .brand-title{font-size:20px}
  .brand-kicker{font-size:10px;letter-spacing:.1em}
  .brand .pxmark{width:30px;height:30px}
  .brand{gap:9px}
  .count{padding:8px 12px}
  .count .n{font-size:17px}
  .detail{padding:16px}
  .detail h1{font-size:20px}
  .detail .cta{width:100%;text-align:center}
  .filters .searchrow{flex-direction:column}
  .btn{width:100%}
}

/* ==========================================================================
   Platform v1 — favourites, recently opened, batched grid, access badges,
   lazy-detail placeholders. Uses the existing tokens; adds no new palette.
   ========================================================================== */
.card{position:relative}
.card .fav,.card .lock{position:absolute;top:10px;z-index:2}
.card .fav{right:10px;width:30px;height:30px;display:grid;place-items:center;
  border:1px solid var(--line);border-radius:8px;background:var(--surface-1);
  color:var(--text-muted);font-size:15px;line-height:1;cursor:pointer;padding:0}
.card .fav:hover{border-color:var(--accent);color:var(--accent)}
.card .fav.on{color:#e8a317;border-color:#e8a317}
.card .lock{right:48px;font-size:9.5px;letter-spacing:1.1px;font-weight:800;
  padding:5px 7px;border-radius:6px;background:var(--surface-2);color:var(--text-secondary);
  border:1px solid var(--line)}
.card .lock[data-access=premium]{color:#8a5a00;border-color:#e8a317;background:#fff6e0}
:root[data-theme=dark] .card .lock[data-access=premium]{color:#f0c35c;background:#3a2f12;
  border-color:#7a5e1a}

.searchrow .fav-filter.on{border-color:#e8a317;color:#8a5a00;background:#fff6e0}
:root[data-theme=dark] .searchrow .fav-filter.on{color:#f0c35c;background:#3a2f12;
  border-color:#7a5e1a}

.recent{margin:18px 0 6px}
.recent h2{font-size:12px;letter-spacing:1.4px;text-transform:uppercase;
  color:var(--text-muted);margin:0 0 9px}
.rrow{display:flex;gap:9px;overflow-x:auto;padding-bottom:4px;
  scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch}
.rchip{flex:0 0 auto;max-width:230px;scroll-snap-align:start;text-decoration:none;
  border:1px solid var(--line);border-left:3px solid var(--c,var(--accent));
  border-radius:9px;padding:8px 11px;background:var(--surface-1);display:block}
.rchip:hover{border-color:var(--accent)}
.rchip .rk{display:block;font-size:10px;letter-spacing:.6px;text-transform:uppercase;
  color:var(--text-muted);margin-bottom:2px}
.rchip .rt{display:block;font-size:12.5px;color:var(--text-primary);line-height:1.3;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.morerow{display:flex;justify-content:center;margin:22px 0 4px}
.morerow .btn span{color:var(--text-muted);font-weight:400}

.favbig{border:1px solid var(--line);background:var(--surface-1);color:var(--text-secondary);
  border-radius:9px;padding:0 15px;font:inherit;font-size:13px;font-weight:600;cursor:pointer;
  min-height:44px}
.favbig:hover{border-color:var(--accent);color:var(--accent)}
.favbig.on{color:#8a5a00;border-color:#e8a317;background:#fff6e0}
:root[data-theme=dark] .favbig.on{color:#f0c35c;background:#3a2f12;border-color:#7a5e1a}

.summary.skel{background:var(--surface-2);border-radius:6px;min-height:3.2em;
  animation:skel 1.3s ease-in-out infinite}
@keyframes skel{0%,100%{opacity:.55}50%{opacity:.9}}
.loadingcol{color:var(--text-muted);font-size:13px;padding:6px 0}

@media (prefers-reduced-motion: reduce){
  .summary.skel{animation:none}
}

/* Touch targets and one-hand reach on a phone. */
@media (max-width: 640px){
  .searchrow{flex-wrap:wrap}
  .searchrow .btn{min-height:44px}
  .card .fav{width:34px;height:34px}
  .ctarow{flex-wrap:wrap;gap:9px}
  .cta{flex:1 1 100%;text-align:center}
}

/* Update prompt and offline banner — deliberately unobtrusive, and it never
   swaps the page under someone mid-experiment. */
.updatebar{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);z-index:60;
  display:flex;align-items:center;gap:12px;max-width:calc(100vw - 32px);
  background:var(--surface-1);border:1px solid var(--line-strong);border-radius:11px;
  padding:11px 13px;box-shadow:0 12px 30px -12px rgba(0,0,0,.42);font-size:13px}
.updatebar button{border:1px solid var(--accent);background:var(--accent);color:#fff;
  border-radius:8px;padding:8px 13px;font:inherit;font-size:12.5px;font-weight:700;cursor:pointer}
.offlinebar{position:fixed;left:0;right:0;top:0;z-index:70;text-align:center;
  background:#8a5a00;color:#fff;font-size:12.5px;padding:6px 10px}
:root[data-theme=dark] .offlinebar{background:#7a5e1a}
@supports (padding: max(0px)) {
  .updatebar{bottom:max(18px, env(safe-area-inset-bottom))}
  .offlinebar{padding-top:max(6px, env(safe-area-inset-top))}
}

/* ==========================================================================
   The simulation runner

   A simulation is a self-contained file. Rather than rewriting seventeen of
   them - or seventeen hundred - to carry a navigation bar, the shell frames
   one and puts the bar above it. The frame scrolls; the bar does not, so
   "Library" is reachable from any depth of a long simulation without a single
   line of navigation code inside the simulation itself.
   ========================================================================== */
.runner{
  position:fixed; inset:0; z-index:80; display:flex; flex-direction:column;
  background:var(--surface-0);
}
/* A class that sets `display` beats the user-agent [hidden] rule, so a runner
   left "hidden" would still swallow every click on the page behind it. */
.runner[hidden]{display:none}
body.running{overflow:hidden}

.rbar{
  display:flex; align-items:center; gap:12px; flex:0 0 auto;
  background:var(--surface-1); border-bottom:1px solid var(--line);
  padding:calc(env(safe-area-inset-top, 0px) + 8px)
          calc(env(safe-area-inset-right, 0px) + 12px) 8px
          calc(env(safe-area-inset-left, 0px) + 12px);
}
.rback{
  display:inline-flex; align-items:center; gap:5px; flex:0 0 auto;
  min-height:44px; padding:0 10px 0 6px; border-radius:9px;
  color:var(--accent); font:600 14.5px/1 var(--sans); text-decoration:none;
  white-space:nowrap;
}
.rback:hover{background:var(--surface-2)}
.rtitle{
  flex:1 1 auto; min-width:0; font:500 13.5px/1.3 var(--sans);
  color:var(--text-secondary);
  overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
}
.rfav{
  flex:0 0 auto; min-width:44px; min-height:44px; border:0; border-radius:9px;
  background:none; color:var(--text-muted); font-size:19px; cursor:pointer;
}
.rfav:hover{background:var(--surface-2)}
.rfav.on{color:#e8a317}

.rstage{flex:1 1 auto; min-height:0; display:flex}
.rstage iframe{
  flex:1 1 auto; width:100%; height:100%; border:0; background:var(--surface-0);
  padding-bottom:env(safe-area-inset-bottom, 0px);
}

/* Appears only after a real scroll, and only on the simulations long enough to
   need it. One control, in one corner - not a floating cluster sitting on top
   of the experiment. */
.rtop{
  position:absolute; z-index:2;
  right:calc(env(safe-area-inset-right, 0px) + 14px);
  bottom:calc(env(safe-area-inset-bottom, 0px) + 14px);
  min-height:40px; padding:0 14px; border-radius:999px;
  border:1px solid var(--line-strong); background:var(--surface-1);
  color:var(--text-secondary); font:600 13px/1 var(--sans); cursor:pointer;
  box-shadow:0 6px 18px -8px rgba(0,0,0,.45);
  opacity:.94;
}
.rtop:hover{background:var(--surface-2); color:var(--text-primary); opacity:1}
.rtop[hidden]{display:none}

/* Desktop: the same bar, just calmer. */
@media (min-width:760px){
  .rbar{padding-left:20px; padding-right:20px; gap:16px}
  .rtitle{font-size:14.5px}
}