:root{--blue:#2563EB;--sky:#93C5FD;--charcoal:#1C1C2E;--amber:#93C5FD;--green:#2563EB;--red:#64748B;--fs:17px;--r:20px}
html.dark{--bg:#0B0C16;--bg2:#12132A;--card:rgba(255,255,255,.045);--card2:rgba(255,255,255,.08);--line:rgba(255,255,255,.10);--text:#F1F5F9;--muted:#A5B0C4;--accent:#3B82F6;--accent2:#93C5FD;--shadow:0 24px 60px rgba(0,0,0,.45);--glow:rgba(37,99,235,.35)}
html.light{--bg:#F5F7FB;--bg2:#FFFFFF;--card:#FFFFFF;--card2:#F1F5F9;--line:#E2E8F0;--text:#1C1C2E;--muted:#5B6478;--accent:#2563EB;--accent2:#1D4ED8;--shadow:0 14px 40px rgba(28,28,46,.08);--glow:rgba(37,99,235,.15)}
*{box-sizing:border-box}
html{font-size:var(--fs);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,sans-serif;line-height:1.6;overflow-x:hidden;min-height:100vh}
html.ar body{font-family:'IBM Plex Sans Arabic',Inter,sans-serif}
html.ar *{letter-spacing:normal!important;text-transform:none!important}
.ltr{direction:ltr;unicode-bidi:isolate}.ltr.nw{white-space:nowrap}
button{font:inherit;color:inherit;cursor:pointer}
a{color:inherit}
.wrap{max-width:1080px;margin:0 auto;padding:0 16px}
/* header */
header.top{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);background:color-mix(in srgb,var(--bg) 80%,transparent);border-bottom:1px solid var(--line)}
.hbar{display:flex;align-items:center;gap:10px;height:58px}
.logo{height:21px;width:auto;display:block}
html.dark .logo.l,html.light .logo.d{display:none}
.nav{display:flex;gap:2px;flex:1;min-width:0;overflow-x:auto;scrollbar-width:none}
.nav a{text-decoration:none;font-size:.8rem;font-weight:600;color:var(--muted);padding:7px 10px;border-radius:10px;white-space:nowrap}
.nav a.on{color:var(--text);background:var(--card2)}
.ctrls{display:flex;gap:6px;flex:none}
.pill{border:1px solid var(--line);background:var(--card);border-radius:999px;padding:6px 12px;font-size:.78rem;font-weight:600;min-height:36px}
.pill:active{transform:scale(.97)}
.sz{display:flex;align-items:center;padding:0 4px}
.sz button{border:0;background:none;padding:6px 6px;font-weight:700;font-size:.76rem;min-height:34px;border-radius:999px}
.sz button:disabled{opacity:.3;cursor:default}
@media (max-width:700px){.hbar{flex-wrap:wrap;height:auto;padding-top:8px;gap:6px}.ctrls{margin-inline-start:auto}.nav{order:3;flex-basis:100%;justify-content:space-around;border-top:1px solid var(--line);margin:6px -16px 0;padding:4px 8px}.nav a{font-size:.82rem;padding:7px 14px}.pill{padding:6px 10px}}
@media (max-width:400px){.logo{height:17px}}
/* common */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow)}
.kicker{font-size:.72rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--accent2)}
.ex{display:inline-block;font-size:.72rem;font-weight:600;color:var(--sky);border:1px solid color-mix(in srgb,var(--sky) 45%,transparent);border-radius:999px;padding:2px 10px;margin-bottom:10px}
.cta{display:inline-flex;align-items:center;gap:10px;background:var(--blue);color:#fff;border:0;border-radius:14px;padding:14px 22px;font-weight:700;box-shadow:0 10px 30px rgba(37,99,235,.45);text-decoration:none}
.cta.ghost{background:var(--card2);color:var(--text);box-shadow:none;border:1px solid var(--line)}
.msg{font-size:.9rem;border-inline-start:3px solid var(--accent);padding:8px 12px;background:var(--card2);border-radius:8px}
.note{font-size:.8rem;color:var(--muted)}
.legend{display:flex;flex-wrap:wrap;gap:10px;font-size:.74rem;color:var(--muted)}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-inline-end:5px;vertical-align:middle}
h2.sec{font-size:1.3rem;margin:34px 0 6px}
.lead{color:var(--muted);margin:0 0 16px}
/* home */
.hero{position:relative;overflow:hidden;border-radius:28px;margin-top:22px;padding:52px 26px 38px;background:radial-gradient(900px 400px at 85% -10%,rgba(37,99,235,.55),transparent 60%),radial-gradient(700px 380px at 0% 110%,rgba(147,197,253,.25),transparent 60%),linear-gradient(160deg,#141633,#0B0C16);color:#F1F5F9;border:1px solid rgba(255,255,255,.08)}
.hero .grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:44px 44px;mask-image:linear-gradient(180deg,#000,transparent 85%);-webkit-mask-image:linear-gradient(180deg,#000,transparent 85%)}
.bars{position:absolute;inset-inline-end:28px;bottom:0;display:flex;gap:10px;align-items:flex-end;height:78%;opacity:.9}
.bars i{display:block;width:clamp(14px,3vw,30px);border-radius:8px 8px 0 0;background:linear-gradient(180deg,#93C5FD,#2563EB 60%,rgba(37,99,235,.1));transform-origin:bottom;animation:grow 2.6s cubic-bezier(.2,.8,.2,1) both}
@keyframes grow{from{transform:scaleY(0)}}
.hero-in{position:relative;max-width:620px}
.hero .kick{font-size:.8rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:#93C5FD}
.hero h1{font-size:clamp(2rem,6vw,3.3rem);line-height:1.08;margin:10px 0 14px;font-weight:800}
html.ar .hero h1{line-height:1.3}
.hero p{color:#C9D3E6;font-size:1.05rem;margin:0 0 22px}
.stats{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px}
.stat{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:10px 14px;min-width:92px}
.stat b{display:block;font-size:1.3rem}
.stat span{font-size:.74rem;color:#A5B0C4}
.prep{margin-top:20px;font-size:.8rem;color:#A5B0C4}
.twocol{display:grid;grid-template-columns:1fr 1.4fr;gap:12px}
.prog{padding:22px;display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center}
.ring{position:relative;width:140px;height:140px}
.ring svg{transform:rotate(-90deg)}
.ring b{position:absolute;inset:0;display:grid;place-items:center;font-size:1.7rem;font-weight:800}
.mini{display:flex;gap:10px;width:100%}
.mini div{flex:1;border-radius:12px;background:var(--card2);padding:10px;font-size:.72rem;color:var(--muted)}
.mini b{display:block;font-size:1.15rem;color:var(--text)}
.bcard{padding:20px}
.badges{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin-top:12px}
.bdg{text-align:center;font-size:.64rem;line-height:1.3;color:var(--muted)}
.hex{width:100%;max-width:58px;aspect-ratio:1/1.1;margin:0 auto 6px;clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%);display:grid;place-items:center;font-weight:800;background:var(--card2);color:var(--muted);position:relative;overflow:hidden}
.hex i{position:absolute;inset:auto 0 0 0;background:rgba(37,99,235,.55)}
.hex span{position:relative}
.bdg.on .hex{background:linear-gradient(150deg,#93C5FD,#2563EB 55%,#1E3A8A);color:#fff;box-shadow:0 0 24px var(--glow)}
.bdg.on{color:var(--text)}
.mods{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.modc{padding:16px;text-decoration:none;display:block;transition:transform .2s,border-color .2s}
.modc:hover{transform:translateY(-2px);border-color:var(--accent)}
.modc .n{font-size:.7rem;font-weight:800;color:var(--accent2);letter-spacing:.1em}
.modc h3{margin:6px 0 8px;font-size:1rem;line-height:1.35}
.modc .meta{font-size:.75rem;color:var(--muted)}
.bar{height:4px;border-radius:4px;background:var(--card2);margin-top:12px;overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--sky))}
footer{padding:46px 0 70px;color:var(--muted);font-size:.78rem;text-align:center}
/* syllabus */
.smod{margin-bottom:12px;overflow:hidden}
.mh{display:flex;gap:14px;align-items:center;padding:16px 18px;width:100%;background:none;border:0;text-align:start}
.mnum{flex:none;width:44px;height:48px;clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%);background:linear-gradient(150deg,#93C5FD,#2563EB 55%,#1E3A8A);display:grid;place-items:center;color:#fff;font-weight:800}
.mt{flex:1}.mt b{display:block;font-size:1.05rem;line-height:1.3}.mt span{font-size:.78rem;color:var(--muted)}
.chev{transition:transform .25s;color:var(--muted)}
.smod.open .chev{transform:rotate(180deg)}
.mb{display:none;padding:0 18px 18px}
.smod.open .mb{display:block}
.covers{font-size:.86rem;color:var(--muted);border-inline-start:3px solid var(--accent);padding:4px 12px;margin-bottom:14px}
.los{background:var(--card2);border-radius:14px;padding:12px 16px;margin-bottom:10px}
.los b{font-size:.76rem;letter-spacing:.08em;text-transform:uppercase;color:var(--accent2)}
.los ol{margin:6px 0 0;padding-inline-start:20px;font-size:.92rem}
.les{display:flex;gap:12px;align-items:center;padding:12px 4px;border-top:1px solid var(--line);text-decoration:none}
.lnum{flex:none;font-size:.78rem;font-weight:800;color:var(--accent2);width:36px}
.lt{flex:1}.lt b{display:block;font-size:.95rem}.lt span{font-size:.84rem;color:var(--muted)}
.lst{flex:none;font-size:.72rem;font-weight:700;border-radius:999px;padding:4px 10px;border:1px solid var(--line);color:var(--muted);white-space:nowrap}
.lst.open{background:var(--blue);border-color:var(--blue);color:#fff}
.lst.done{background:rgba(37,99,235,.18);border-color:var(--green);color:var(--text)}
a.les:hover{background:var(--card2)}
/* word bank */
.wb{padding:20px}
.search{width:100%;border:1px solid var(--line);background:var(--card2);color:var(--text);border-radius:14px;padding:14px 16px;font:inherit;font-size:1rem}
.chips{display:flex;gap:6px;overflow-x:auto;padding:12px 0;scrollbar-width:none}
.chip{flex:none;border:1px solid var(--line);background:var(--card);border-radius:999px;padding:6px 12px;font-size:.78rem;font-weight:600}
.chip.on{background:var(--blue);border-color:var(--blue);color:#fff}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}
.fc{perspective:900px;height:178px;cursor:pointer}
.fc .in{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}
.fc.flip .in{transform:rotateY(180deg)}
.fc .f,.fc .b{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:16px;border:1px solid var(--line);padding:14px;display:flex;flex-direction:column}
.fc .f{background:var(--card2)}
.fc .b{background:linear-gradient(150deg,#1E3A8A,#2563EB);color:#fff;transform:rotateY(180deg);font-size:.88rem}
.fc .t{font-weight:800;font-size:1.02rem;line-height:1.3}
.fc .o{color:var(--muted);font-size:.82rem;margin-top:4px}
.fc .ab{align-self:flex-start;font-size:.68rem;font-weight:800;background:var(--blue);color:#fff;border-radius:6px;padding:1px 7px;margin-bottom:8px}
.fc .m{margin-top:auto;font-size:.7rem;color:var(--muted)}
.fc .b .m{color:#C7D7FE}
/* lesson player */
.lbar{position:sticky;top:var(--hh,58px);z-index:40;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.lbar .wrap{display:flex;align-items:center;gap:10px;height:46px}
.lbar .lt2{flex:1;font-size:.8rem;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lbar .cnt{font-size:.74rem;color:var(--muted)}
.lprog{height:3px;background:var(--card2)}
.lprog i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--sky));transition:width .4s}
#slide{padding:22px 0 120px;animation:sin .45s ease both}
@keyframes sin{from{opacity:0;transform:translateY(10px)}}
.sl{display:grid;grid-template-columns:1.1fr 1fr;gap:26px;align-items:center}
.sl.one{grid-template-columns:1fr}
.sl h1{font-size:clamp(1.5rem,4.5vw,2.2rem);line-height:1.2;margin:6px 0 14px;font-weight:800}
.sl p{color:var(--muted);margin:0 0 12px}
.pnav{position:fixed;bottom:0;inset-inline:0;z-index:45;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:10px 16px calc(10px + env(safe-area-inset-bottom))}
.pnav .wrap{display:flex;align-items:center;gap:12px;padding:0}
.dots{display:flex;gap:4px;flex:1;justify-content:center;overflow:hidden;min-width:0}
.dots i{flex:none;width:6px;height:6px;border-radius:9px;background:var(--card2);transition:all .3s}
.dots i.on{width:16px;background:var(--blue)}
.dots i.seen{background:color-mix(in srgb,var(--blue) 45%,var(--card2))}
.nbtn{border:1px solid var(--line);background:var(--card);border-radius:12px;padding:11px 16px;font-weight:700;min-width:92px}
.nbtn.pri{background:var(--blue);border-color:var(--blue);color:#fff}
.nbtn:disabled{opacity:.35}
.coverbox{border-radius:26px;padding:40px 26px;background:radial-gradient(700px 300px at 90% -10%,rgba(37,99,235,.5),transparent 60%),linear-gradient(160deg,#141633,#0B0C16);color:#F1F5F9;border:1px solid rgba(255,255,255,.08)}
.coverbox p{color:#C9D3E6}
.goal{margin-top:18px;border-radius:16px;padding:14px 16px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12)}
.goal b{display:block;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:#93C5FD;margin-bottom:4px}
.photo{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.ph{border-radius:16px;padding:18px;border:1px solid var(--line);background:var(--card2);text-align:center}
.ph svg{width:60px;height:60px}
.ph b{display:block;margin-top:8px}
.ph span{font-size:.8rem;color:var(--muted)}
.house{display:flex;flex-direction:column;gap:10px}
.hrow{display:flex;min-height:54px;border-radius:12px;overflow:hidden;font-weight:700;font-size:.85rem}
.hrow div{display:flex;align-items:center;justify-content:center;color:#fff;padding:6px 8px;text-align:center}
.eq{font-weight:800;font-size:1.05rem;text-align:center;padding:12px;border-radius:12px;background:var(--card2)}
.tcards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.tcard{padding:20px;border-top:4px solid var(--c)}
.tcard .term{font-size:1.35rem;font-weight:800;margin:4px 0 6px}
.tcard .pl{font-weight:600;margin-bottom:12px}
.tcard .eg{font-size:.86rem;color:var(--muted);border-top:1px dashed var(--line);padding-top:10px}
.tcard .eg b{color:var(--sky);font-size:.72rem;display:block;margin-bottom:2px}
.steps{display:flex;flex-direction:column;gap:8px}
.st{border:1px solid var(--line);border-radius:14px;padding:12px 14px;background:var(--card2);opacity:.3;transition:opacity .4s,border-color .4s}
.st.on{opacity:1;border-color:var(--accent)}
.st small{display:block;color:var(--muted);font-size:.8rem;margin-top:2px}
.tot3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.tot3 div{border-radius:12px;padding:10px;background:var(--card2);font-size:.66rem;color:var(--muted)}
.tot3 strong{display:block;color:var(--text);font-size:.8rem}
.tot3 b{display:block;font-size:1rem;color:var(--text)}
.three{display:grid;grid-template-columns:1.35fr 1fr;overflow:hidden;padding:0}
#scale3d{position:relative;min-height:420px;background:radial-gradient(600px 300px at 50% 0%,var(--glow),transparent 70%)}
#scale3d canvas{display:block;width:100%;height:100%;touch-action:pan-y}
.hint{position:absolute;bottom:12px;inset-inline-start:14px;font-size:.72rem;color:var(--muted);background:var(--card);border:1px solid var(--line);padding:4px 10px;border-radius:999px}
.side{padding:18px;border-inline-start:1px solid var(--line);display:flex;flex-direction:column;gap:9px}
.evt{display:flex;justify-content:space-between;align-items:center;gap:10px;text-align:start;border:1px solid var(--line);background:var(--card2);border-radius:14px;padding:11px 14px;font-size:.88rem;font-weight:600;min-height:48px}
.evt:disabled{opacity:.4;cursor:default}
.evt em{font-style:normal;color:var(--accent2);font-size:1.1rem}
.struct{display:grid;grid-template-columns:1fr 1fr;gap:14px;height:330px;margin-bottom:14px}
.scol{display:flex;flex-direction:column;gap:6px}
.scol h4{margin:0 0 4px;font-size:.8rem;color:var(--muted);text-align:center}
.blk{border-radius:12px;display:flex;align-items:center;justify-content:center;text-align:center;color:#fff;font-weight:700;font-size:.82rem;padding:6px;cursor:pointer;transform-origin:bottom;animation:grow .9s cubic-bezier(.2,.8,.2,1) both;border:2px solid transparent;min-height:42px}
.blk.on{border-color:#fff;box-shadow:0 0 0 3px var(--glow)}
.scol{min-width:0}.scol h4,.blk{overflow-wrap:anywhere;word-break:break-word;hyphens:auto}
.struct.many{gap:6px}.struct.many .blk{font-size:.68rem;padding:4px 3px}.struct.many h4{font-size:.68rem}
.stmt{display:grid;grid-template-columns:1.2fr 1fr;overflow:hidden;padding:0}
.rows{padding:10px}
.shead{font-size:.72rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--accent2);padding:12px 14px 4px}
.row{display:flex;justify-content:space-between;gap:12px;padding:10px 14px;border-radius:12px;cursor:pointer;border:1px solid transparent}
.row:hover{background:var(--card2)}
.row.on{background:var(--card2);border-color:var(--accent)}
.row.sub{font-weight:700}
.row.tot{font-weight:800;border-top:1px solid var(--line);border-radius:0 0 12px 12px}
.row .v{font-variant-numeric:tabular-nums;white-space:nowrap}
.explain{padding:22px;border-inline-start:1px solid var(--line);background:var(--card2)}
.inl{display:none;margin:2px 6px 8px;padding:10px 12px;border-radius:10px;background:var(--card2);border-inline-start:3px solid var(--accent);font-size:.86rem;color:var(--text)}
@media (max-width:820px){.stmt .explain{display:none}.inl{display:block}}
.explain h4{margin:4px 0 10px;font-size:1.15rem}
.sliders .slr{margin-bottom:16px}
.slr label{display:flex;justify-content:space-between;font-size:.88rem;font-weight:600;margin-bottom:6px;gap:8px}
.slr label b{color:var(--accent2)}
input[type=range]{width:100%;accent-color:var(--blue);height:32px}
.big{font-size:clamp(1.5rem,7.5vw,2.6rem);font-weight:800;line-height:1.15;overflow-wrap:anywhere}
.sl>*,.three>*,.stmt>*{min-width:0}
.slr label b{overflow-wrap:anywhere;text-align:end}
.gauge{position:relative;height:14px;border-radius:999px;background:linear-gradient(90deg,#64748B 0%,#64748B 20%,#2563EB 20%,#2563EB 100%);margin:14px 0 6px;opacity:.85}
.gauge .mk{position:absolute;top:-6px;width:4px;height:26px;border-radius:3px;background:var(--text);transition:inset-inline-start .3s}
.gauge .one{position:absolute;top:18px;font-size:.7rem;color:var(--muted)}
.res{border-radius:16px;padding:16px;background:linear-gradient(135deg,rgba(37,99,235,.18),rgba(147,197,253,.06));border:1px solid var(--line)}
.quiz{padding:24px;max-width:780px}
.qopts{display:grid;gap:10px;margin:16px 0}
.qo{text-align:start;border:1px solid var(--line);background:var(--card2);border-radius:14px;padding:14px 16px;font-weight:600;min-height:52px;display:flex;gap:12px;align-items:center}
.qo .k{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:var(--card);border:1px solid var(--line);font-size:.8rem;flex:none}
.qo.ok{border-color:var(--green);background:rgba(37,99,235,.12)}
.qo.no{border-color:var(--red);background:rgba(100,116,139,.10)}
.fb{border-radius:14px;padding:14px 16px;font-size:.92rem;margin-bottom:12px}
.fb.good{background:rgba(37,99,235,.12);border:1px solid rgba(37,99,235,.4)}
.fb.bad{background:rgba(100,116,139,.10);border:1px solid rgba(100,116,139,.35)}
.qstars{font-size:1rem;letter-spacing:4px}
.tks{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.tk{padding:20px}
.tk .num{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;background:var(--blue);color:#fff;font-weight:800;margin-bottom:12px}
.tk b{display:block;margin-bottom:6px;font-size:1.02rem}
.tk span{color:var(--muted);font-size:.9rem}
.donebox{max-width:520px;margin:20px auto;padding:34px 24px;text-align:center}
.medal{width:96px;height:106px;margin:0 auto 16px;clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%);background:linear-gradient(150deg,#93C5FD,#2563EB 55%,#1E3A8A);display:grid;place-items:center;color:#fff;font-size:1.8rem;font-weight:800;animation:pop .6s cubic-bezier(.2,1.4,.4,1)}
@keyframes pop{from{transform:scale(.6);opacity:0}}
.donebox h1{font-size:2rem;margin:6px 0 10px}
.donebox p{color:var(--muted)}
.dbtns{display:flex;flex-direction:column;gap:10px;margin-top:18px;align-items:center}
/* generic kinds */
.flow{display:flex;flex-direction:column;gap:8px}
.fl{display:flex;gap:12px;align-items:flex-start;text-align:start;border:1px solid var(--line);background:var(--card2);border-radius:14px;padding:12px 14px;width:100%}
.fl.on{border-color:var(--accent);background:color-mix(in srgb,var(--blue) 14%,var(--card2))}
.fl .fn{flex:none;width:28px;height:28px;border-radius:9px;display:grid;place-items:center;background:var(--blue);color:#fff;font-weight:800;font-size:.8rem}
.fl b{display:block}.fl small{display:block;color:var(--muted);font-size:.86rem;margin-top:4px;font-weight:400}
.mx{overflow-x:auto;padding:0}
.mx table{border-collapse:collapse;width:100%;font-size:.86rem}
.mx th,.mx td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:start;white-space:nowrap}
.mx thead th{font-size:.74rem;color:var(--accent2);text-transform:uppercase;letter-spacing:.08em}
.dots3{display:inline-flex;gap:3px;vertical-align:middle}.dots3 i{width:9px;height:9px;border-radius:50%;background:var(--card2);border:1px solid var(--line)}.dots3 i.on{background:var(--blue);border-color:var(--blue)}
.hcards{display:flex;flex-direction:column;gap:8px}
.evt.sel{border-color:var(--accent);background:color-mix(in srgb,var(--blue) 14%,var(--card2))}
#hold3d canvas{display:block;width:100%;height:100%;touch-action:pan-y}
#confetti{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:200}
@media (max-width:820px){
 .sl,.three,.stmt,.twocol{grid-template-columns:1fr}
 .tcards,.tks{grid-template-columns:1fr}
 .side,.explain{border-inline-start:0;border-top:1px solid var(--line)}
 #scale3d{min-height:330px}
 .hero{padding:40px 20px 30px}
 .bars{opacity:.35}
 .badges{grid-template-columns:repeat(4,1fr)}
 .struct{height:300px}
}

/* Hedge Learn logo (26 Oct): Hedge + LEARN, like the Hedge Learn site */
.hl{display:flex;align-items:center;gap:9px}.hl .lrn{font-size:10.5px;font-weight:900;letter-spacing:.22em;text-transform:uppercase;color:#2563EB;border-left:1px solid rgba(147,197,253,.4);padding-left:9px;line-height:1}html.light .hl .lrn{color:#2563EB;border-left-color:rgba(29,83,204,.35)}
a:has(> .hl),.hl .lrn{text-decoration:none}

/* Hedge Learn hero: the course diagram in 3D (27 Oct) */
.hero .hl3d{position:absolute;inset-inline-end:0;top:0;bottom:0;width:52%;height:100%;opacity:0;cursor:grab;animation:none;touch-action:pan-y}
.hero .hl3d.on{opacity:1;animation:hl3dIn .9s ease both}@keyframes hl3dIn{from{transform:translateY(10px)}to{transform:none}}.hero .hl3d:active{cursor:grabbing}
@media (max-width:760px){.hero .hl3d{position:relative;display:block;inset:auto;width:100%;height:230px;margin:-10px 0 8px;opacity:0}.hero .hl3d.on{opacity:1}.hero .hero-in{position:relative;z-index:1}}

/* Word bank cards, redesigned 27 Oct (Ahmed: "this should have better design"): the definition is on the card, flip = the other language */
.cards{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.fc{height:238px}
.fc .f,.fc .b{padding:18px 18px 16px;border-radius:18px;gap:4px;transition:border-color .2s ease,box-shadow .2s ease}
.fc .f{background:linear-gradient(180deg,rgba(37,99,235,.12),rgba(37,99,235,0) 45%),var(--card2);border-color:rgba(147,197,253,.18)}
.fc:hover .f{border-color:rgba(37,99,235,.75);box-shadow:0 18px 34px -22px rgba(0,0,0,.8)}
.fc .top{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.fc .mch{font-size:.66rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#93C5FD;border:1px solid rgba(147,197,253,.32);border-radius:999px;padding:3px 9px}
.fc .ab{margin:0;align-self:auto}
.fc .fl{margin-inline-start:auto;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:rgba(37,99,235,.2);color:#93C5FD;font-size:.9rem;transition:transform .4s ease}
.fc:hover .f .fl{transform:rotate(180deg)}
.fc .t{font-size:1.14rem;line-height:1.25}
.fc .o{color:#93C5FD;font-size:.86rem;margin-top:2px}
.fc .d{margin-top:10px;padding-top:10px;border-top:1px solid rgba(147,197,253,.14);font-size:.85rem;line-height:1.5;color:var(--muted);display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.fc .b{background:linear-gradient(150deg,#1C1C2E,#2563EB);border-color:rgba(147,197,253,.4)}
.fc .b .d{color:#F1F5F9;border-top-color:rgba(255,255,255,.22);-webkit-line-clamp:6}
.fc .b .mch{color:#F1F5F9;border-color:rgba(255,255,255,.4)}
.fc .b .fl{background:rgba(255,255,255,.18);color:#fff}
html.light .fc .o,html.light .fc .f .mch{color:#2563EB;border-color:rgba(37,99,235,.35)}

/* hero: text and 3D side by side, never on top of each other (27 Oct) */
@media (min-width:761px){.hero .hero-in{max-width:52%}.hero .hl3d{width:46%}}

.vbtn{min-width:44px;min-height:44px;font-size:1.1rem;line-height:1;cursor:pointer}

/* Hedge colours only (4 Nov): right / wrong told apart by a mark, not by green / red */
.qo.ok::after{content:"\2713";margin-inline-start:auto;font-weight:800;color:var(--blue)}
.qo.no::after{content:"\2717";margin-inline-start:auto;font-weight:800;color:var(--muted)}