/* ============================================================
   Axis – shared design system for sub-pages (features/, subjects/)
   Same visual DNA as index.html. Load with:
   <link rel="stylesheet" href="../assets/site.css" />
   ============================================================ */
:root{
  --blue:#527FFF; --blue2:#3F6CF0; --blue-deep:#2C44C9; --indigo:#2D55D6;
  --teal:#2DE3C5; --teal-ink:#06342C; --amber:#FFC861; --coral:#FF8A6B;
  --navy:#0A123A; --space:#070E2E; --ink:#16203F; --muted:#5B678A; --line:#E7ECF6;
  --bg:#F8FAFC; --card:#FFFFFF; --ok:#22C08B; --stuck:#F5A524; --idle:#9AA6C4;
  --fh:'Baloo 2',system-ui,sans-serif; --fb:'Nunito',system-ui,sans-serif; --fm:'JetBrains Mono',ui-monospace,monospace;
  --shadow:0 1px 2px rgba(16,28,70,.05),0 10px 30px -12px rgba(16,28,70,.14);
  --shadow-hover:0 4px 12px rgba(15,23,42,.06),0 20px 40px rgba(15,23,42,.10);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--fb);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;line-height:1.55}
::selection{background:rgba(82,127,255,.2)}
img,svg{display:block;max-width:100%}
a{color:inherit}
.wrap{max-width:1140px;margin:0 auto;padding:0 22px}
.narrow{max-width:820px;margin:0 auto;padding:0 22px}
section{padding:72px 0}
@media (max-width:720px){section{padding:52px 0}}

/* ---------- type ---------- */
.kick{display:inline-flex;align-items:center;gap:9px;font-family:var(--fm);font-weight:700;font-size:.72rem;
  letter-spacing:.2em;text-transform:uppercase;color:var(--blue2);margin-bottom:16px}
.kick::before{content:"";width:10px;height:10px;border-radius:3px;background:var(--teal);box-shadow:0 0 10px var(--teal)}
.kick.on-dark{color:#C8FFF4;background:rgba(7,14,46,.5);border:1px solid rgba(45,227,197,.5);
  padding:.52em 1.05em;border-radius:999px;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
h1,h2,h3,h4{font-family:var(--fh);line-height:1.1;text-wrap:balance}
h2.sec{font-weight:800;font-size:clamp(1.8rem,4vw,2.7rem);letter-spacing:-.01em}
.sec-sub{margin-top:14px;font-size:clamp(1rem,1.6vw,1.14rem);font-weight:600;color:var(--muted);max-width:60ch}
.center{text-align:center}.center .sec-sub{margin-left:auto;margin-right:auto}
.g{background:linear-gradient(110deg,#ffffff 0%,#9AF7E6 45%,var(--teal) 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  filter:drop-shadow(0 2px 14px rgba(45,227,197,.6))}
.gb{background:linear-gradient(90deg,var(--blue),var(--indigo));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--fb);font-weight:900;
  font-size:.98rem;letter-spacing:.02em;border:none;border-radius:14px;padding:.85em 1.6em;cursor:pointer;
  text-decoration:none;transition:transform .13s ease,box-shadow .13s ease,background .15s ease;white-space:nowrap}
.btn-teal{background:var(--teal);color:var(--teal-ink);box-shadow:0 5px 0 #17B096,0 16px 30px -14px rgba(45,227,197,.7)}
.btn-teal:hover{background:#52ECD3;transform:translateY(-1px);box-shadow:0 6px 0 #17B096,0 18px 34px -14px rgba(45,227,197,.8)}
.btn-teal:active{transform:translateY(4px);box-shadow:0 1px 0 #17B096}
.btn-blue{background:var(--blue);color:#fff;box-shadow:0 5px 0 var(--blue-deep),0 14px 26px -12px rgba(82,127,255,.6)}
.btn-blue:hover{background:var(--blue2);transform:translateY(-1px);box-shadow:0 6px 0 var(--blue-deep),0 16px 30px -12px rgba(82,127,255,.7)}
.btn-blue:active{transform:translateY(4px);box-shadow:0 1px 0 var(--blue-deep)}
.btn-outline{background:var(--navy);color:#fff;box-shadow:0 5px 0 #05091f,0 14px 26px -12px rgba(10,18,58,.55)}
.btn-outline:hover{background:#15205c;transform:translateY(-1px);box-shadow:0 6px 0 #05091f,0 16px 30px -12px rgba(10,18,58,.6)}
.btn-outline:active{transform:translateY(4px);box-shadow:0 1px 0 #05091f}
.btn-white{background:#fff;color:var(--blue-deep);box-shadow:0 5px 0 #D8DEF0,0 14px 28px -14px rgba(20,50,110,.4)}
.btn-white:hover{transform:translateY(-1px);box-shadow:0 6px 0 #D8DEF0}
.btn-white:active{transform:translateY(4px);box-shadow:0 1px 0 #D8DEF0}
.btn-ghost{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.4);border-radius:14px;
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.btn-ghost:hover{background:rgba(255,255,255,.22);transform:translateY(-1px)}

/* ---------- nav (sub-pages: solid cream, dropdowns) ---------- */
.nav{position:sticky;top:0;z-index:120;background:#FBF8F1;border-bottom:1px solid #ECE6D9}
.nav-in{max-width:1140px;margin:0 auto;padding:0 22px;height:64px;display:flex;align-items:center;gap:20px}
.brand{display:flex;align-items:center;text-decoration:none;margin-right:8px;flex-shrink:0}
.brand img{height:22px;width:auto;display:block;filter:brightness(0);opacity:.92}
.nav-links{display:flex;gap:2px;align-items:center;flex:1}
.nav-links>a,.drop>a{font-weight:800;font-size:.92rem;color:var(--ink);text-decoration:none;
  padding:.42em .8em;border-radius:10px;transition:background .15s,color .15s;display:inline-flex;align-items:center;gap:5px}
.nav-links>a:hover,.drop>a:hover{background:#F1EBDF;color:var(--blue-deep)}
.nav-links>a.active,.drop>a.active{color:var(--blue-deep);background:#EEF3FF}
.drop{position:relative}
.drop>a{position:relative}
.drop>a::after{content:"▾";font-size:.72em;opacity:.8}
/* transparent bridge across the trigger→menu gap so hover never drops mid-move */
.drop>a::before{content:"";position:absolute;left:-8px;right:-8px;bottom:-12px;height:14px}
.drop-menu{position:absolute;top:calc(100% + 6px);left:0;min-width:250px;background:#fff;
  border:1px solid var(--line);border-radius:16px;padding:8px;box-shadow:var(--shadow-hover);display:none;flex-direction:column;gap:2px}
.drop:hover .drop-menu,.drop.open .drop-menu{display:flex}
.drop-menu a{display:block;text-decoration:none;padding:9px 12px;border-radius:10px;color:var(--ink)}
.drop-menu a:hover{background:#EEF3FF}
.drop-menu a b{font-family:var(--fh);font-weight:700;font-size:.92rem;display:block}
.drop-menu a small{font-weight:700;font-size:.72rem;color:var(--muted)}
.drop-menu.two{display:none;grid-template-columns:1fr 1fr;min-width:330px}
.drop:hover .drop-menu.two,.drop.open .drop-menu.two{display:grid}
.nav-compare{margin-left:auto}
.nav-cta{display:flex;gap:12px;align-items:center;flex-shrink:0}
.btn-navwhite{display:inline-flex;align-items:center;font-family:var(--fb);font-weight:900;font-size:.88rem;
  background:#fff;color:var(--blue-deep);border:none;border-radius:12px;padding:.72em 1.15em;cursor:pointer;
  text-decoration:none;white-space:nowrap;box-shadow:0 4px 0 #D8DEF0;transition:transform .12s,box-shadow .12s}
.btn-navwhite:hover{transform:translateY(-1px);box-shadow:0 5px 0 #D8DEF0}
.btn-navwhite:active{transform:translateY(3px);box-shadow:0 1px 0 #D8DEF0}
.btn-game{display:inline-flex;align-items:center;gap:7px;font-family:var(--fb);font-weight:900;font-size:.88rem;
  letter-spacing:.02em;background:var(--teal);color:var(--teal-ink);border:none;border-radius:12px;
  padding:.72em 1.15em;cursor:pointer;text-decoration:none;white-space:nowrap;
  box-shadow:0 4px 0 #17B096;transition:transform .12s ease,box-shadow .12s ease}
.btn-game:hover{transform:translateY(-1px);box-shadow:0 5px 0 #17B096}
.btn-game:active{transform:translateY(3px);box-shadow:0 1px 0 #17B096}
#navToggle{display:none;background:#fff;border:2px solid #E2DCCF;color:var(--ink);
  border-radius:10px;width:40px;height:40px;font-size:1.1rem;cursor:pointer;box-shadow:0 3px 0 #E2DCCF}
#navToggle:active{transform:translateY(2px);box-shadow:0 1px 0 #E2DCCF}
@media (max-width:1060px){
  .nav-links{position:fixed;top:72px;right:14px;left:auto;flex-direction:column;align-items:stretch;gap:6px;
    background:#FFFDF9;border:1px solid #ECE6D9;border-radius:16px;padding:12px;box-shadow:var(--shadow-hover);
    display:none;min-width:260px;max-height:calc(100vh - 90px);overflow:auto}
  .nav-links.open{display:flex}
  .drop{display:flex;flex-direction:column}
  .drop>a::after{margin-left:auto;transition:transform .2s ease}   /* keep the arrow, push it right */
  .drop.open>a{background:#F1EBDF;color:var(--blue-deep);border-radius:10px}
  .drop.open>a::after{transform:rotate(180deg)}
  .drop-menu,.drop-menu.two{display:none;position:static;min-width:0;border:none;box-shadow:none;background:transparent;
    padding:2px 0 6px;margin:2px 0 5px 10px;border-left:2px solid var(--line);grid-template-columns:none}
  .drop:hover .drop-menu,.drop:hover .drop-menu.two{display:none}          /* neutralise sticky touch-hover */
  .drop.open .drop-menu,.drop.open .drop-menu.two{display:flex;flex-direction:column}
  .drop-menu a{padding:9px 14px}
  .drop-menu a small{display:none}                                        /* hide descriptions - keep it tidy */
  .nav-links>a.nav-compare{display:none}                                              /* drop Compare on mobile */
  #navToggle{display:block}
  .nav-cta .btn-navwhite{display:none}
}

/* ---------- page hero band ---------- */
.phero{position:relative;overflow:hidden;color:#fff;padding:70px 0 90px;
  background:linear-gradient(135deg,var(--space) 0%,var(--navy) 45%,#13205C 75%,#1B2E8A 100%)}
.phero::before{content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 82% 20%,rgba(45,227,197,.32),transparent 44%),
             radial-gradient(circle at 8% 90%,rgba(82,127,255,.32),transparent 46%)}
.phero::after{content:"";position:absolute;inset:0;opacity:.06;
  background-image:linear-gradient(rgba(255,255,255,.5) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.5) 1px,transparent 1px);background-size:34px 34px}
.phero .wrap{position:relative;z-index:2}
.phero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
@media (max-width:900px){.phero-grid{grid-template-columns:1fr;gap:28px}}
.phero h1{font-weight:800;font-size:clamp(2.1rem,4.6vw,3.3rem);text-shadow:0 4px 26px rgba(5,9,26,.4)}
.phero .lede{margin-top:16px;font-weight:600;font-size:clamp(1.02rem,1.8vw,1.2rem);color:#DBE6FF;max-width:52ch}
.phero .pcta{margin-top:26px;display:flex;gap:12px;flex-wrap:wrap}
.crumb{font-family:var(--fm);font-weight:700;font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;
  color:#9FB0E6;margin-bottom:16px}
.crumb a{color:#9AF7E6;text-decoration:none}
.phero-vis{border-radius:22px;overflow:hidden;border:1px solid rgba(255,255,255,.18);
  box-shadow:0 40px 90px -30px rgba(0,0,0,.55);background:#0A123A;position:relative}
.phero-vis img{display:block;width:100%;aspect-ratio:16/10;object-fit:cover}

/* ---------- content sections ---------- */
.lead-row{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;padding:8px 0}
@media (max-width:900px){.lead-row{grid-template-columns:1fr;gap:26px}}
.lead-row.flip .lr-vis{order:-1}
@media (max-width:900px){.lead-row.flip .lr-vis{order:0}}
.lr-vis{border-radius:22px;overflow:hidden;border:1px solid var(--line);box-shadow:0 30px 70px -30px rgba(10,18,58,.4)}
.lr-vis img{display:block;width:100%;object-fit:cover;aspect-ratio:16/10}
.lr-txt h2{font-weight:800;font-size:clamp(1.5rem,2.8vw,2.05rem)}
.lr-txt p{margin-top:12px;font-weight:600;color:var(--muted);font-size:1rem}
.pts{margin-top:16px;list-style:none;display:flex;flex-direction:column;gap:9px}
.pts li{display:flex;gap:10px;font-weight:700;font-size:.94rem}
.pts li::before{content:"";width:9px;height:9px;border-radius:3px;background:var(--teal);
  box-shadow:0 0 8px rgba(45,227,197,.8);flex-shrink:0;margin-top:7px}

/* three-up cards */
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:40px}
@media (max-width:860px){.cards3{grid-template-columns:1fr}}
.pcard{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px;box-shadow:var(--shadow);
  transition:transform .25s,box-shadow .25s}
.pcard:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.pcard .em{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;font-size:1.3rem;margin-bottom:12px;background:#EEF3FF}
.pcard h3{font-weight:800;font-size:1.15rem}
.pcard p{margin-top:7px;font-weight:600;font-size:.9rem;color:var(--muted)}

/* ---------- embedded live demo iframe ---------- */
.demo-frame{display:block;width:100%;max-width:900px;margin:0 auto;aspect-ratio:1.62;border:none;border-radius:22px;
  box-shadow:var(--shadow-hover);background:#0A123A}

/* ---------- phone poster fallback for the heavy three.js demo ---------- */
/* Default: hidden on all widths (the live iframe shows). On phones (<=700px)
   the iframe is hidden and this on-brand poster card is shown instead. */
.demo-fallback{display:none;text-decoration:none}
.demo-fallback .df-k{font-family:var(--fm);font-weight:700;font-size:.62rem;letter-spacing:.16em;
  text-transform:uppercase;color:#7ff3e2}
.demo-fallback h3{font-family:var(--fh);font-weight:800;font-size:1.5rem;line-height:1.12;margin-top:8px}
.demo-fallback p{font-weight:700;font-size:.95rem;color:#DBE6FF;margin-top:8px;line-height:1.45}
.demo-fallback .df-btn{display:inline-block;margin-top:18px;font-family:var(--fb);font-weight:900;font-size:.95rem;
  padding:.75em 1.2em;border-radius:14px;background:var(--teal);color:var(--teal-ink);
  box-shadow:0 5px 0 #17B096;text-decoration:none;align-self:flex-start}
.demo-fallback .df-btn:active{transform:translateY(4px);box-shadow:0 1px 0 #17B096}

@media (max-width:700px){
  .demo-frame{display:none}
  .demo-fallback{display:flex;flex-direction:column;justify-content:flex-end;width:100%;max-width:900px;
    margin:0 auto;min-height:300px;aspect-ratio:0.9;border-radius:22px;padding:22px;box-sizing:border-box;
    background:linear-gradient(150deg,var(--space) 0%,var(--navy) 48%,#13205C 82%,#1B2E8A 100%);
    box-shadow:var(--shadow-hover);color:#EAF2FF}
}

/* ---------- interactive slide widget (theory carousel) ---------- */
.slidebox{max-width:900px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:22px;
  overflow:hidden;box-shadow:var(--shadow-hover)}
.slidebox-top{display:flex;align-items:center;gap:10px;padding:11px 16px;background:#EEF2FB;border-bottom:1px solid var(--line)}
.slidebox-top .dot{width:11px;height:11px;border-radius:50%}
.slidebox-top .lab{margin-left:6px;font-family:var(--fm);font-weight:700;font-size:.68rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--muted)}
.slidebox-stage{position:relative;background:linear-gradient(135deg,#070E2E,#13205C);min-height:360px;color:#fff}
.slide{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;padding:38px 44px;
  opacity:0;transform:translateX(24px);transition:opacity .45s ease,transform .45s ease;pointer-events:none}
.slide.on{opacity:1;transform:none;pointer-events:auto}
.slide .sk{font-family:var(--fm);font-weight:700;font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;color:#9AF7E6}
.slide h3{font-weight:800;font-size:clamp(1.5rem,3vw,2.1rem);margin-top:8px}
.slide p{margin-top:12px;font-weight:600;font-size:1.02rem;color:#DBE6FF;max-width:52ch}
.slide .chips{margin-top:16px;display:flex;gap:8px;flex-wrap:wrap}
.slide .chips span{font-weight:800;font-size:.8rem;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);
  padding:.4em .8em;border-radius:999px}
.slidebox-ctrl{display:flex;align-items:center;gap:12px;padding:14px 18px;border-top:1px solid var(--line);background:#fff}
.slidebox-ctrl .dots{display:flex;gap:7px;flex:1}
.slidebox-ctrl .dots b{width:22px;height:6px;border-radius:3px;background:#D3DBEC;cursor:pointer;transition:background .2s}
.slidebox-ctrl .dots b.on{background:var(--blue)}
.snav{width:40px;height:40px;border-radius:12px;border:1px solid var(--line);background:#fff;cursor:pointer;
  font-size:1rem;font-weight:800;color:var(--ink);box-shadow:0 3px 0 var(--line)}
.snav:active{transform:translateY(2px);box-shadow:0 1px 0 var(--line)}
/* phones: widen the text column and give the slide vertical breathing room */
@media (max-width:520px){
  .slidebox-stage{min-height:320px}
  .slide{padding:26px 22px}
  .slide p{font-size:.96rem}
}

/* ---------- try-it band ---------- */
.tryit{background:linear-gradient(135deg,var(--space),#13205C,#1B2E8A);color:#fff;position:relative;overflow:hidden;
  border-radius:26px;padding:44px;text-align:center}
.tryit::before{content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 80% 25%,rgba(45,227,197,.3),transparent 44%),
             radial-gradient(circle at 12% 88%,rgba(82,127,255,.32),transparent 46%)}
.tryit>*{position:relative;z-index:1}
.tryit h2{font-weight:800;font-size:clamp(1.6rem,3vw,2.3rem)}
.tryit p{margin-top:12px;font-weight:600;color:#CDD7FF;max-width:52ch;margin-left:auto;margin-right:auto}
.tryit .pcta{margin-top:24px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.tryit .tnote{margin-top:14px;font-family:var(--fm);font-weight:700;font-size:.64rem;letter-spacing:.14em;
  text-transform:uppercase;color:#9FB0E6}

/* ---------- spec / outcome strip ---------- */
.specs{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:8px}
@media (max-width:860px){.specs{grid-template-columns:repeat(2,1fr)}}
.spec{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;text-align:center;box-shadow:var(--shadow)}
.spec .n{font-family:var(--fh);font-weight:800;font-size:1.7rem;color:var(--navy)}
.spec .n em{font-style:normal;color:var(--blue)}
.spec .d{margin-top:4px;font-weight:700;font-size:.8rem;color:var(--muted)}

/* ---------- FAQ ---------- */
.faq{max-width:820px;margin:0 auto}
.qa-item{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px 20px;margin-top:12px;box-shadow:var(--shadow)}
.qa-item h4{font-weight:800;font-size:1.05rem}
.qa-item p{margin-top:7px;font-weight:600;font-size:.92rem;color:var(--muted)}

/* ---------- related nav ---------- */
.related{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:26px}
.related a{font-weight:800;font-size:.85rem;background:#EEF3FF;color:var(--indigo);border:1px solid #DCE6FF;
  padding:.55em 1.05em;border-radius:999px;text-decoration:none;transition:transform .15s}
.related a:hover{transform:translateY(-2px)}

/* ---------- footer ---------- */
footer{background:#070C24;color:#B9C2DE;padding:52px 0 28px}
.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
@media (max-width:860px){.fgrid{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.fgrid{grid-template-columns:1fr}}
.fbrand img{height:30px;width:auto}
.fbrand p{margin-top:10px;font-weight:600;font-size:.82rem;max-width:30ch}
footer h5{font-family:var(--fm);font-weight:700;font-size:.62rem;letter-spacing:.18em;text-transform:uppercase;
  color:rgba(255,255,255,.9);margin-bottom:14px}
footer ul{list-style:none;display:flex;flex-direction:column;gap:9px}
footer ul a{font-weight:700;font-size:.85rem;color:#B9C2DE;text-decoration:none}
footer ul a:hover{color:var(--teal)}
.fbot{margin-top:42px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);display:flex;
  justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:.74rem;font-weight:600}

/* ---------- compact teacher-dashboard mock (Plots page) ---------- */
.dashmini{background:#EEF2FB;border-radius:22px;padding:14px;box-shadow:0 40px 100px -30px rgba(10,18,58,.5);
  border:1px solid rgba(255,255,255,.4);max-width:960px;margin:0 auto}
.dm-top{display:flex;align-items:center;gap:12px;background:linear-gradient(120deg,#0A123A,#16266E 60%,#1D3AA0);
  border-radius:14px;padding:12px 16px;color:#fff;flex-wrap:wrap}
.dm-top .sq{width:11px;height:11px;border-radius:3px;background:var(--teal);box-shadow:0 0 12px var(--teal)}
.dm-top b{font-family:var(--fh);font-size:.95rem}
.dm-top .mono{font-family:var(--fm);font-weight:700;font-size:.56rem;letter-spacing:.14em;color:#9FB0E6;text-transform:uppercase}
.dm-top .clschip{font-weight:800;font-size:.72rem;color:#fff;background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.18);border-radius:12px;padding:.45em .8em;white-space:nowrap}
.dm-top .live{margin-left:auto;font-family:var(--fm);font-weight:700;font-size:.62rem;letter-spacing:.12em;color:#BAFFF1;
  background:rgba(45,227,197,.14);border:1px solid rgba(45,227,197,.45);padding:.4em .7em;border-radius:999px;
  display:inline-flex;align-items:center;gap:7px}
.dm-top .live i{width:8px;height:8px;border-radius:50%;background:var(--teal);animation:pulse 1.8s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(45,227,197,.6)}70%{box-shadow:0 0 0 8px rgba(45,227,197,0)}100%{box-shadow:0 0 0 0 rgba(45,227,197,0)}}
.dm-kpis{margin-top:12px;display:grid;grid-template-columns:repeat(6,1fr);gap:10px}
@media (max-width:960px){.dm-kpis{grid-template-columns:repeat(3,1fr)}}
@media (max-width:560px){.dm-kpis{grid-template-columns:repeat(2,1fr)}}
.dm-kpis .kpi{background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px}
.dm-kpis .lab{font-size:.64rem;font-weight:700;color:var(--muted)}
.dm-kpis .val{font-family:var(--fh);font-weight:800;font-size:1.4rem;margin-top:3px}
.dm-kpis .val.good{color:var(--ok)}.dm-kpis .val.warn{color:var(--stuck)}
.dm-kpis .sub{font-size:.6rem;font-weight:700;color:var(--muted)}
.dm-grid{margin-top:12px;display:grid;grid-template-columns:1.5fr 1fr;gap:12px;align-items:start}
@media (max-width:860px){.dm-grid{grid-template-columns:1fr}}
.ai-card{background:linear-gradient(135deg,#0C1746,#1B2E86);border-radius:16px;padding:14px;color:#fff}
.ai-card .h{display:flex;justify-content:space-between;align-items:center;gap:8px}
.ai-card .h b{font-family:var(--fh);font-size:.95rem}
.ai-badge{font-family:var(--fm);font-weight:700;font-size:.56rem;letter-spacing:.12em;color:#BAFFF1;
  background:rgba(45,227,197,.14);border:1px solid rgba(45,227,197,.45);padding:.35em .6em;border-radius:999px}
.insight{display:flex;gap:10px;align-items:flex-start;background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:10px;margin-top:9px}
.insight .ic{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;font-size:.85rem;flex-shrink:0}
.insight .who{font-family:var(--fh);font-weight:700;font-size:.85rem}
.insight .why{font-size:.72rem;font-weight:600;color:#CDD9FF;margin-top:1px}
.dm-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px}
.dm-card .h{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:10px}
.dm-card .h b{font-family:var(--fh);font-size:.95rem}
.dm-card .h small{font-size:.64rem;font-weight:700;color:var(--muted)}
.fun-row{display:grid;grid-template-columns:110px 1fr 26px;gap:8px;align-items:center;font-size:.72rem;font-weight:700;margin-top:7px}
.fun-bar{height:13px;border-radius:7px;background:#EEF2FB;overflow:hidden}
.fun-bar i{display:block;height:100%;border-radius:7px;background:linear-gradient(90deg,var(--blue),var(--teal))}
.fun-row .c{font-family:var(--fm);color:var(--muted);text-align:right}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s cubic-bezier(.22,1,.36,1),transform .6s cubic-bezier(.22,1,.36,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
  .slide{transition:none}
}

/* mobile "open the interactive lesson" notice modal */
.dm-notice{position:fixed;inset:0;z-index:300;display:none;align-items:center;justify-content:center;padding:24px;
  background:rgba(7,14,46,.62);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.dm-notice.on{display:flex}
.dm-notice .dm-card{background:#fff;border-radius:22px;padding:30px 26px;max-width:360px;width:100%;text-align:center;
  box-shadow:0 30px 80px -20px rgba(10,18,58,.5)}
.dm-notice .dm-em{font-size:2.6rem;line-height:1}
.dm-notice h3{font-family:var(--fh);font-weight:800;font-size:1.4rem;margin-top:12px;color:var(--ink)}
.dm-notice p{font-weight:600;font-size:.96rem;color:var(--muted);margin-top:10px;line-height:1.5}
.dm-notice .dm-ok{margin-top:22px;font-family:var(--fb);font-weight:900;font-size:.98rem;border:none;border-radius:14px;
  padding:.8em 1.8em;cursor:pointer;background:var(--teal);color:var(--teal-ink);box-shadow:0 5px 0 #17B096;transition:transform .12s,box-shadow .12s}
.dm-notice .dm-ok:active{transform:translateY(3px);box-shadow:0 1px 0 #17B096}