/* ============================================================
   AIVR CPL — subject page stylesheet
   Shared by all 15 /dgca-*-question-bank pages, generated from
   scripts/build-subject-pages.js.

   Self-contained: the subject pages do NOT depend on index.html's
   inline <style>, so a token change here does not silently diverge
   from the landing page — it has to be made in both places on
   purpose. The identity is the same (slate / cream / lime,
   Plus Jakarta Sans + IBM Plex Mono); the layout language is not,
   because these are reference pages, not a pitch.

   HOUSE RULES (same as index.html):
   - never `background:` shorthand with var(), use the longhand
   - every grid/flex track that can hold prose gets min-width:0,
     or one nowrap descendant re-widens the whole page on a phone
   ============================================================ */

:root{
  --ink:#0B1A22;
  --slate:#1F3A4B;
  --slate2:#173040;
  --slate3:#2C4C60;
  --cream:#FAFDEE;
  --surface:#F0EEE9;
  --surface2:#E7E4DD;
  --cream2:#F1F5E0;
  --cream3:#E3EACD;
  --lime:#C2F84F;
  --lime2:#A7E32B;
  --limeInk:#5C8A00;   /* darkest lime that clears 4.5:1 on cream */
  --mute:#5F7889;
  --muted:#9DB3C0;
  --line:rgba(31,58,75,.14);
  --lined:rgba(250,253,238,.15);
  --disp:'Plus Jakarta Sans','Segoe UI',system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
  --nav:66px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--disp);
  background-color:var(--cream);
  color:var(--slate);
  font-size:16.5px;line-height:1.62;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
@supports (overflow-x:clip){body{overflow-x:clip}}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background-color:var(--lime);color:var(--slate)}
[id]{scroll-margin-top:calc(var(--nav) + 14px)}

.wrap{width:min(1180px,92vw);margin:0 auto}
.sec{padding:clamp(64px,7.5vw,110px) 0;position:relative}

/* Anything that can hold a long word or a mono string sits in a track that
   must be allowed to be narrower than its content. */
.grid>*,.cols>*,.specs>*,.tgrid>*,.igrid>*,.srail>*,.swgrid>*,.fcols>*{min-width:0}
p,li,dd,dt,h1,h2,h3,blockquote{overflow-wrap:break-word}

h1,h2,h3{font-weight:800;letter-spacing:-.045em;line-height:1}
.h1{font-size:clamp(34px,6.4vw,74px);letter-spacing:-.055em;line-height:.94}
.h2{font-size:clamp(27px,3.6vw,46px);letter-spacing:-.048em;line-height:1.02}
.h3{font-size:clamp(19px,2vw,25px);letter-spacing:-.035em;line-height:1.14}
.kick{
  font-family:var(--mono);font-size:11px;font-weight:500;
  letter-spacing:.24em;text-transform:uppercase;color:var(--mute);
  display:flex;align-items:center;gap:10px;margin-bottom:18px;
}
.kick::before{content:"";width:24px;height:2px;background-color:var(--lime2);flex:none}
.lead{font-size:clamp(16px,1.3vw,19.5px);line-height:1.6;color:var(--mute);max-width:64ch}
.dark{background-color:var(--slate);color:var(--cream)}
.dark .kick,.dark .lead{color:var(--muted)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:50px;padding:0 26px;border-radius:99px;border:1.5px solid transparent;
  font-family:var(--disp);font-size:15px;font-weight:700;letter-spacing:-.01em;
  cursor:pointer;white-space:nowrap;
  transition:transform .24s cubic-bezier(.2,1.3,.4,1),box-shadow .24s,background-color .2s,color .2s,border-color .2s;
}
.btn-p{background-color:var(--lime);color:#16303E;box-shadow:0 10px 26px -12px rgba(122,168,20,.9)}
.btn-p:hover{transform:translateY(-3px);box-shadow:0 18px 38px -14px rgba(122,168,20,1)}
.btn-g{background-color:transparent;color:var(--slate);border-color:var(--line)}
.btn-g:hover{border-color:var(--slate);transform:translateY(-3px)}
.dark .btn-g{color:var(--cream);border-color:var(--lined)}
.dark .btn-g:hover{border-color:var(--lime);color:var(--lime)}
.btn .ar{transition:transform .3s}
.btn:hover .ar{transform:translateX(4px)}

/* ---------- nav ---------- */
#nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav);z-index:90;
  display:flex;align-items:center;border-bottom:1px solid transparent;
  transition:background-color .3s,box-shadow .3s,border-color .3s;
}
#nav.stuck{
  background-color:rgba(250,253,238,.85);
  backdrop-filter:blur(14px) saturate(1.4);-webkit-backdrop-filter:blur(14px) saturate(1.4);
  border-bottom-color:var(--line);
}
#nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:18px}
/* Same lockup as index.html / AIVRCPLapp.html: one line, "CPL" in lime. */
.brand{--brand-size:34px;display:flex;align-items:center;flex:none;line-height:1}
.brand .bm{font-size:var(--brand-size);font-weight:800;letter-spacing:-.055em;color:var(--ink);white-space:nowrap}
.brand .bm i{font-style:normal;color:var(--limeInk)}
.nlinks{display:flex;align-items:center;gap:26px}
.nlinks a{font-size:14px;font-weight:600;color:var(--slate);opacity:.72;position:relative;transition:opacity .2s}
.nlinks a::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;background-color:var(--lime2);transform:scaleX(0);transform-origin:left;transition:transform .3s cubic-bezier(.2,1,.3,1)}
.nlinks a:hover{opacity:1}
.nlinks a:hover::after{transform:scaleX(1)}
.ncta{
  display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 20px;border-radius:99px;
  background-color:var(--slate);color:var(--cream);font-size:13.5px;font-weight:700;
  transition:transform .22s,background-color .22s;
}
.ncta:hover{transform:translateY(-2px);background-color:var(--lime);color:#16303E}
.burger{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background-color:transparent;cursor:pointer;align-items:center;justify-content:center;flex-direction:column;gap:5px}
.burger i{display:block;width:17px;height:1.8px;background-color:var(--slate);transition:transform .3s,opacity .2s}
body.sheet .burger i:nth-child(1){transform:translateY(6.8px) rotate(45deg)}
body.sheet .burger i:nth-child(2){opacity:0}
body.sheet .burger i:nth-child(3){transform:translateY(-6.8px) rotate(-45deg)}
#sheet{
  position:fixed;inset:var(--nav) 0 auto 0;z-index:88;display:none;
  background-color:var(--cream);border-bottom:1px solid var(--line);padding:18px 0 28px;
  max-height:calc(100dvh - var(--nav));overflow-y:auto;overscroll-behavior:contain;
}
body.sheet #sheet{display:block}
#sheet .wrap{display:flex;flex-direction:column;gap:2px}
#sheet a{padding:14px 0;font-size:19px;font-weight:700;letter-spacing:-.03em;border-bottom:1px solid var(--line)}
#sheet .btn{margin-top:18px;width:100%}
@media(max-width:980px){.nlinks{display:none}.burger{display:flex}}
@media(max-width:980px) and (min-width:521px){.ncta{margin-left:auto;margin-right:14px}}
@media(max-width:520px){.ncta{display:none}.brand{--brand-size:27px}}
@media(max-width:360px){.brand{--brand-size:24px}}

/* ---------- reveal ---------- */
html.js .rv{opacity:0;transition:opacity .75s cubic-bezier(.16,.84,.34,1),transform .75s cubic-bezier(.16,.84,.34,1);transition-delay:var(--d,0ms);transform:translateY(26px)}
html.js .rv.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  html.js .rv{opacity:1!important;transform:none!important;transition:none}
}

/* ---------- breadcrumb ---------- */
.crumbs{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.15em;text-transform:uppercase;
  color:var(--muted);display:flex;flex-wrap:wrap;align-items:center;gap:9px;margin-bottom:22px;
}
.crumbs a{opacity:.85;border-bottom:1px solid transparent;transition:border-color .2s,color .2s}
.crumbs a:hover{color:var(--lime);border-bottom-color:var(--lime)}
.crumbs i{font-style:normal;opacity:.45}

/* ---------- hero ---------- */
#shero{
  background-color:var(--slate);color:var(--cream);position:relative;overflow:hidden;
  padding:calc(var(--nav) + clamp(42px,6vw,80px)) 0 clamp(48px,6vw,84px);
}
#shero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(880px 460px at 88% -10%,rgba(194,248,79,.16),transparent 62%);
}
#shero .wrap{position:relative;z-index:2}
.hcode{
  display:inline-flex;align-items:center;gap:10px;border:1px solid var(--lined);border-radius:99px;
  padding:7px 15px;font-family:var(--mono);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--lime);margin-bottom:20px;
}
.hcode .dot{width:6px;height:6px;border-radius:50%;background-color:var(--lime);flex:none}
#shero h1{max-width:17ch}
#shero .lead{margin-top:20px;color:var(--muted);max-width:60ch}
#shero .lead b{color:var(--cream);font-weight:700}
.hcta{display:flex;flex-wrap:wrap;gap:13px;margin-top:clamp(26px,3vw,38px);align-items:center}
.hnote{font-family:var(--mono);font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--muted)}

/* hero stat rail */
.srail{
  margin-top:clamp(36px,4.4vw,58px);border-top:1px solid var(--lined);
  display:grid;grid-template-columns:repeat(4,1fr);
}
.srail div{padding:20px 18px 4px 0;border-right:1px solid var(--lined)}
.srail div:last-child{border-right:0}
.srail b{display:block;font-size:clamp(25px,3vw,40px);font-weight:800;letter-spacing:-.05em;line-height:1;color:var(--lime);font-variant-numeric:tabular-nums}
.srail span{display:block;margin-top:8px;font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
@media(max-width:720px){
  .srail{grid-template-columns:repeat(2,1fr)}
  .srail div{border-bottom:1px solid var(--lined)}
  .srail div:nth-child(2n){border-right:0}
}
@media(max-width:400px){.srail div{padding-right:12px}}

/* ---------- exam spec board ---------- */
#paper{background-color:var(--cream2);border-bottom:1px solid var(--line)}
.specs{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:clamp(28px,3vw,40px)}
@media(max-width:900px){.specs{grid-template-columns:repeat(3,1fr)}}
@media(max-width:560px){.specs{grid-template-columns:repeat(2,1fr)}}
.spec{
  background-color:var(--cream);border:1px solid var(--line);border-radius:18px;padding:20px 18px;
  display:flex;flex-direction:column;gap:6px;
}
.spec b{font-size:clamp(24px,2.6vw,34px);font-weight:800;letter-spacing:-.05em;line-height:1;font-variant-numeric:tabular-nums}
.spec span{font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--mute);line-height:1.5}
.spec.hi{background-color:var(--slate);color:var(--cream);border-color:var(--slate)}
.spec.hi b{color:var(--lime)}
.spec.hi span{color:var(--muted)}
.pnote{
  margin-top:22px;font-size:14.5px;color:var(--mute);max-width:78ch;
  border-left:3px solid var(--lime2);padding-left:15px;line-height:1.6;
}

/* ---------- what's inside / topic grid ---------- */
#inside{background-color:var(--cream)}
.tgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:clamp(30px,3.4vw,46px)}
@media(max-width:940px){.tgrid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.tgrid{grid-template-columns:1fr}}
.tcard{
  position:relative;background-color:var(--surface);border:1px solid var(--line);border-radius:20px;
  padding:22px 20px 24px;overflow:hidden;
  transition:transform .35s cubic-bezier(.2,1,.3,1),border-color .35s,box-shadow .35s;
}
.tcard:hover{transform:translateY(-5px);border-color:rgba(31,58,75,.3);box-shadow:0 26px 46px -32px rgba(31,58,75,.55)}
.tcard::after{content:"";position:absolute;left:20px;right:20px;bottom:0;height:2px;background-color:var(--lime2);transform:scaleX(0);transform-origin:left;transition:transform .45s cubic-bezier(.2,1,.3,1)}
.tcard:hover::after{transform:scaleX(1)}
.tcard .tn{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:12px}
.tcard .tn em{font-style:normal;font-family:var(--mono);font-size:10px;letter-spacing:.18em;color:var(--limeInk)}
.tcard .tn span{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:var(--mute);white-space:nowrap}
.tcard h3{font-size:18px;letter-spacing:-.032em;line-height:1.2;margin-bottom:9px}
.tcard p{font-size:14.5px;color:var(--mute);line-height:1.55}
.chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}
.chips i{
  font-style:normal;font-family:var(--mono);font-size:9.5px;letter-spacing:.1em;text-transform:uppercase;
  border:1px solid var(--line);border-radius:99px;padding:5px 10px;color:var(--mute);
}

/* ---------- insight prose ---------- */
#insight{background-color:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.igrid{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(24px,3vw,44px);margin-top:clamp(30px,3.4vw,46px)}
@media(max-width:860px){.igrid{grid-template-columns:1fr}}
.iitem h3{font-size:20px;letter-spacing:-.035em;margin-bottom:10px;line-height:1.18}
.iitem h3 em{
  display:block;font-style:normal;font-family:var(--mono);font-size:10px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--limeInk);margin-bottom:8px;
}
.iitem p{font-size:15px;color:var(--mute);line-height:1.65}
.iitem p+p{margin-top:11px}

/* ---------- sample question ---------- */
#sample{background-color:var(--cream)}
.cols{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(30px,4.4vw,70px);align-items:center}
@media(max-width:900px){.cols{grid-template-columns:1fr}}
.qcard{
  background-color:var(--surface);border:1px solid var(--line);border-radius:24px;
  padding:clamp(20px,2.2vw,32px);box-shadow:0 40px 80px -50px rgba(31,58,75,.5);
}
.qtop{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.qtag{font-family:var(--mono);font-size:9.5px;letter-spacing:.15em;text-transform:uppercase;border:1px solid var(--line);border-radius:99px;padding:5px 11px;color:var(--mute)}
.qtag.src{background-color:var(--cream2);color:var(--slate)}
.qq{font-size:clamp(16.5px,1.4vw,20px);font-weight:700;letter-spacing:-.025em;line-height:1.36}
.opts{margin-top:18px;display:flex;flex-direction:column;gap:9px}
.opt{display:flex;align-items:center;gap:12px;border:1.5px solid var(--line);border-radius:13px;padding:12px 14px;font-size:14.5px}
.opt kbd{
  font-family:var(--mono);font-size:11px;font-weight:600;width:24px;height:24px;flex:none;border-radius:7px;
  background-color:var(--cream2);color:var(--mute);display:flex;align-items:center;justify-content:center;
}
.opt>span{min-width:0}
.opt.ok{border-color:var(--lime2);background-color:rgba(194,248,79,.17)}
.opt.ok kbd{background-color:var(--lime);color:#16303E}
.opt.ok .mk{margin-left:auto;color:#4E7A0B;font-weight:800;font-size:15px;flex:none}
.sol{margin-top:18px;border-top:1px dashed var(--line);padding-top:18px}
.sol .st{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--mute);margin-bottom:12px}
.formula{
  font-family:var(--mono);font-size:13px;border-left:3px solid var(--lime2);background-color:var(--cream2);
  border-radius:0 12px 12px 0;padding:12px 14px;margin-bottom:13px;
  overflow-x:auto;white-space:nowrap;-webkit-overflow-scrolling:touch;
}
/* A sideways-scrolling formula is worse than a wrapped one on a phone — and
   nowrap in a grid track is exactly what blows a page out horizontally. */
@media(max-width:760px){.formula{white-space:normal;overflow-x:visible;font-size:12.5px;line-height:1.5}}
.steps{list-style:none;display:flex;flex-direction:column;gap:8px}
.steps li{font-size:14px;color:var(--mute);display:flex;gap:11px;line-height:1.5}
.steps li b{color:var(--slate);font-weight:700;font-family:var(--mono);font-size:11px;flex:none;padding-top:2px}
.steps li span{min-width:0}
.bpoints{margin-top:28px;display:flex;flex-direction:column;gap:0;list-style:none}
.bpoints li{display:flex;gap:14px;padding:14px 0;border-top:1px solid var(--line);align-items:flex-start}
.bpoints li:last-child{border-bottom:1px solid var(--line)}
.bpoints .n{font-family:var(--mono);font-size:10.5px;color:var(--limeInk);letter-spacing:.14em;padding-top:3px;flex:none;width:24px}
.bpoints b{display:block;font-size:15.5px;font-weight:700;letter-spacing:-.02em}
.bpoints p{font-size:14px;color:var(--mute);line-height:1.5;margin-top:3px}

/* ---------- FAQ ---------- */
#faq{background-color:var(--cream2);border-top:1px solid var(--line)}
.faqs{margin-top:clamp(26px,3vw,42px);border-top:1px solid var(--line)}
.faqs details{border-bottom:1px solid var(--line)}
.faqs summary{
  list-style:none;cursor:pointer;padding:22px 46px 22px 0;position:relative;
  font-size:clamp(16px,1.4vw,20px);font-weight:700;letter-spacing:-.03em;line-height:1.3;transition:color .2s;
}
.faqs summary::-webkit-details-marker{display:none}
.faqs summary:hover{color:#5C8712}
.faqs summary::after,.faqs summary::before{content:"";position:absolute;right:8px;top:50%;background-color:var(--slate);transition:transform .32s cubic-bezier(.2,1,.3,1)}
.faqs summary::after{width:15px;height:1.8px;margin-top:-.9px}
.faqs summary::before{width:1.8px;height:15px;margin:-7.5px -6.6px 0 0;right:14.6px}
.faqs details[open] summary::before{transform:rotate(90deg);opacity:0}
.faqs .ans{padding:0 clamp(16px,5vw,80px) 24px 0;font-size:15px;color:var(--mute);line-height:1.66}
.faqs .ans a{color:var(--slate);font-weight:600;border-bottom:1.5px solid var(--lime)}

/* ---------- other subjects switcher ---------- */
#switch{background-color:var(--slate);color:var(--cream)}
.swgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:11px;margin-top:clamp(28px,3vw,42px)}
@media(max-width:900px){.swgrid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:540px){.swgrid{grid-template-columns:1fr}}
.swgrid a{
  border:1px solid var(--lined);border-radius:16px;padding:16px 17px;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  transition:border-color .25s,background-color .25s,transform .25s;
}
.swgrid a:hover{border-color:var(--lime);background-color:rgba(194,248,79,.07);transform:translateY(-3px)}
.swgrid b{font-size:15px;font-weight:700;letter-spacing:-.025em;line-height:1.25;min-width:0}
.swgrid b em{display:block;font-style:normal;font-family:var(--mono);font-size:9.5px;font-weight:400;letter-spacing:.15em;text-transform:uppercase;color:var(--muted);margin-top:5px}
.swgrid .go{font-family:var(--mono);font-size:11px;color:var(--lime);flex:none}
.swgrid a[aria-current]{border-color:var(--lime);background-color:rgba(194,248,79,.1)}

/* ---------- closer ---------- */
#closer{background-color:var(--cream);text-align:center;padding:clamp(64px,8vw,110px) 0}
#closer .lead{margin:18px auto 0;text-align:center}
#closer .hcta{justify-content:center}

/* ---------- footer ---------- */
footer{background-color:var(--slate);color:var(--cream);padding:clamp(52px,6vw,84px) 0 32px}
.fcols{
  display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:clamp(22px,3vw,44px);
  width:min(1180px,92vw);margin:0 auto;
}
@media(max-width:940px){.fcols{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.fcols{grid-template-columns:1fr}}
.fcol h4{
  font-family:var(--mono);font-size:10px;font-weight:500;letter-spacing:.2em;text-transform:uppercase;
  color:var(--lime);margin-bottom:15px;
}
.fcol ul{list-style:none;display:flex;flex-direction:column;gap:9px}
.fcol a{font-size:14px;color:var(--cream);opacity:.72;transition:opacity .2s,color .2s;line-height:1.4;display:inline-block}
.fcol a:hover{opacity:1;color:var(--lime)}
.fabout .bm{font-size:30px;font-weight:800;letter-spacing:-.055em;color:var(--cream);line-height:1;display:block;margin-bottom:14px}
.fabout .bm i{font-style:normal;color:var(--lime)}
.fabout p{font-size:14px;color:var(--muted);line-height:1.6;max-width:34ch}
.fbot{
  width:min(1180px,92vw);margin:clamp(34px,4vw,54px) auto 0;padding-top:22px;border-top:1px solid var(--lined);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;
  font-family:var(--mono);font-size:10px;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);
}
.fbot nav{display:flex;gap:18px;flex-wrap:wrap}
.fbot a:hover{color:var(--lime)}

/* ---------- touch ----------
   :hover latches after a tap on a touchscreen; kill the motion, keep the colour. */
@media(hover:none){
  .btn:hover,.ncta:hover,.tcard:hover,.swgrid a:hover{transform:none}
  .tcard:hover{box-shadow:none;border-color:var(--line)}
  .tcard:hover::after{transform:scaleX(0)}
  .btn:hover .ar{transform:none}
  .nlinks a:hover::after{transform:scaleX(0)}
}