:root{color-scheme:dark;--mint:#031417;--deep:#010C0E;--on:#02201C;--glow:rgba(25,240,198,.45);--logo:#19F0C6;--teal:#19F0C6;--teal-d:#5CFFE0;--dew:#7DFFE6;--ink:#E6FFFA;--orange:#FF9F45;--soft:#0E2F33;--line:#1D4A4D;--mute:#8FBDB7;--card:#0A2226;--bad:#FF7B7B;--bad-s:#3A1518;--good-s:#0E3A36;--r:14px;--ease:cubic-bezier(.2,.8,.2,1);font-family:Hind Siliguri,Noto Sans Bengali,system-ui,-apple-system,Segoe UI,sans-serif;color:var(--ink);line-height:1.6;-webkit-text-size-adjust:100%}*{box-sizing:border-box}html{background:var(--mint)}html,body{margin:0}body{min-height:100dvh;font-size:16px}h1,h2,h3{line-height:1.25;margin:0 0 .4em;font-weight:700;letter-spacing:-.01em}h1{font-size:clamp(1.7rem,5vw,2.3rem)}h2{font-size:1.3rem}h3{font-size:1.06rem}p{margin:0 0 .8em}a{color:var(--teal)}:focus-visible{outline:3px solid var(--orange);outline-offset:2px;border-radius:6px}button,input,select,textarea{font:inherit;color:inherit}.wrap{max-width:1040px;margin:0 auto;padding:20px 16px 72px}.narrow{max-width:640px}.page{animation:rise .45s var(--ease) backwards}@keyframes rise{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:16px;padding:10px 16px;background:#031417e0;backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.brand{display:flex;gap:8px;align-items:center;color:var(--ink);text-decoration:none;font-size:1.05rem;white-space:nowrap}.top nav{display:flex;gap:4px;margin-left:auto}.top nav a{padding:6px 11px;border-radius:9px;text-decoration:none;color:var(--mute);font-weight:500;font-size:.95rem;transition:background .2s,color .2s}.top nav a:hover{background:var(--soft);color:var(--ink)}.top nav a.on{color:var(--teal-d);background:var(--soft)}.top-r{display:flex;gap:8px;align-items:center}.me{font-weight:500;font-size:.92rem;text-decoration:none;white-space:nowrap}.burger{display:none;background:none;border:0;padding:8px;width:40px;height:40px;cursor:pointer}.burger i{display:block;height:2px;background:var(--deep);margin:5px 0}.lang{display:flex;border:1px solid var(--line);border-radius:999px;background:var(--card);padding:2px}.lang button{border:0;background:none;border-radius:999px;padding:2px 10px;cursor:pointer;font-size:.84rem;font-weight:600;color:var(--mute);min-height:30px;transition:background .25s,color .25s}.lang button[aria-pressed=true]{background:var(--teal);color:#fff}@media(max-width:760px){.top{flex-wrap:nowrap;justify-content:space-between}.top nav{position:absolute;top:100%;left:0;right:0;background:var(--card);flex-direction:column;padding:8px;border-bottom:1px solid var(--line);transform-origin:top;display:none}.top nav.open{display:flex;animation:rise .25s var(--ease)}.top nav a{padding:12px}.burger{display:block}.me{display:none}.top nav{margin:0}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:9px 20px;border-radius:999px;border:1.5px solid transparent;font-weight:600;cursor:pointer;text-decoration:none;transition:transform .15s var(--ease),background .2s,box-shadow .2s,border-color .2s}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--teal);color:#fff}.btn-primary:hover:not(:disabled){background:var(--teal-d);box-shadow:0 6px 18px #1f8a7847}.btn-ghost{background:var(--card);color:var(--ink);border-color:var(--line)}.btn-ghost:hover:not(:disabled){border-color:var(--teal)}.btn-quiet{background:none;color:var(--teal-d);padding:6px 10px;min-height:38px}.btn-quiet:hover:not(:disabled){background:var(--soft)}.btn-danger{background:var(--card);color:var(--bad);border-color:#7a2f2f}.btn-sm{min-height:36px;padding:4px 14px;font-size:.92rem}.btn-wide{width:100%}.spin{width:16px;height:16px;border-radius:50%;border:2.5px solid currentColor;border-right-color:transparent;animation:sp .7s linear infinite}@keyframes sp{to{transform:rotate(360deg)}}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px}.grid{display:grid;gap:14px}.g2{grid-template-columns:repeat(auto-fit,minmax(min(280px,100%),1fr))}.g3{grid-template-columns:repeat(auto-fit,minmax(min(200px,100%),1fr))}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.between{justify-content:space-between}.mute{color:var(--mute)}.small{font-size:.9rem}.mt{margin-top:16px}.mb{margin-bottom:16px}.tag{display:inline-block;padding:1px 10px;border-radius:999px;background:var(--soft);color:var(--teal-d);font-size:.82rem;font-weight:600}.tag.warn{background:#3a260f;color:#ffc48a}.tag.bad{background:var(--bad-s);color:var(--bad)}.link-card{display:block;color:inherit;text-decoration:none;transition:transform .2s var(--ease),border-color .2s,box-shadow .2s}.link-card:hover{transform:translateY(-2px);border-color:var(--logo);box-shadow:0 8px 22px #0b2b3312}.field{display:block;margin-bottom:12px}.field>span{display:block;font-weight:600;font-size:.93rem;margin-bottom:4px}.field small{color:var(--mute)}input,select,textarea{width:100%;min-height:44px;padding:9px 12px;border:1.5px solid var(--line);border-radius:10px;background:var(--card);transition:border-color .2s,box-shadow .2s}input:focus,select:focus,textarea:focus{outline:0;border-color:var(--teal);box-shadow:0 0 0 3px #3e9e8c33}input[type=checkbox],input[type=radio]{width:20px;height:20px;min-height:0;accent-color:var(--teal)}.check{display:flex;gap:10px;align-items:flex-start;margin-bottom:10px;cursor:pointer}.check input{flex:none;margin-top:3px}.empty{text-align:center;padding:34px 14px;color:var(--mute)}.empty h3{color:var(--ink)}.skeleton i{display:block;height:64px;border-radius:12px;margin-bottom:10px;background:linear-gradient(90deg,#0e2f33 25%,#17494d,#0e2f33 75%);background-size:300% 100%;animation:shim 1.4s linear infinite}@keyframes shim{to{background-position:-300% 0}}.errbox{background:var(--bad-s);border:1px solid #7A2F2F;color:#ffc9c9;border-radius:12px;padding:14px}.note{background:#2b1d0c;border:1px solid #6B4A1F;border-radius:12px;padding:10px 14px;font-size:.93rem}.toast{position:fixed;left:50%;bottom:20px;transform:translate(-50%);z-index:70;background:var(--deep);color:#fff;padding:10px 18px;border-radius:12px;max-width:min(92vw,480px);animation:toast .35s var(--ease);box-shadow:0 10px 30px #00000040}.toast.bad{background:#ffc9c9}@keyframes toast{0%{opacity:0;transform:translate(-50%,14px)}}.scrim{position:fixed;inset:0;z-index:60;background:#0b2b3373;display:flex;align-items:flex-end;justify-content:center;animation:fade .2s}@keyframes fade{0%{opacity:0}}.sheet{background:var(--card);border-radius:18px 18px 0 0;padding:16px;width:100%;max-width:560px;max-height:88dvh;overflow:auto;animation:sheet .32s var(--ease)}@keyframes sheet{0%{transform:translateY(40px);opacity:0}}.sheet header{display:flex;justify-content:space-between;align-items:center}.sheet h3{margin:0}.x{border:0;background:var(--soft);width:36px;height:36px;border-radius:50%;font-size:1.3rem;cursor:pointer}@media(min-width:640px){.scrim{align-items:center}.sheet{border-radius:18px}}.bar{display:block;height:9px;border-radius:9px;background:var(--soft);overflow:hidden}.bar>span{display:block;height:100%;width:0;border-radius:9px;transition:width 1s var(--ease)}.bar.good>span{background:var(--logo)}.bar.bad>span{background:var(--orange)}.hero{position:relative;display:grid;grid-template-columns:1.15fr 1fr;gap:28px;align-items:center;max-width:1040px;margin:0 auto;padding:44px 16px 56px;overflow:hidden}.pill{display:inline-block;padding:3px 13px;background:var(--soft);color:var(--teal-d);font-weight:600;border-radius:999px;font-size:.88rem}.hero h1{font-size:clamp(2.3rem,6.5vw,3.5rem);line-height:1.1;margin:14px 0 8px;letter-spacing:-.025em}.hero .bn{color:var(--orange);font-weight:600;font-size:clamp(1.15rem,3vw,1.45rem);margin-bottom:12px}.hero p.lede{color:var(--mute);max-width:46ch}.chips{display:flex;gap:7px;flex-wrap:wrap;margin-top:18px}.chips span,.chips a{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:2px 12px;font-size:.87rem;font-weight:500;text-decoration:none;color:var(--ink)}.hero-art{position:relative;min-height:330px;display:flex;align-items:center;justify-content:center}.quizcard{position:relative;z-index:2;width:min(100%,370px);background:var(--card);border-radius:18px;padding:20px;box-shadow:0 24px 54px #1f8a7833;animation:floaty 6s ease-in-out infinite}.quizcard small{color:var(--mute)}.quizcard h3{margin:2px 0 12px}.qopt{border:1.5px solid var(--line);border-radius:10px;padding:8px 13px;margin-bottom:8px;font-weight:600;font-size:.94rem;transition:background .45s,border-color .45s,transform .45s var(--ease)}.qopt.lit{background:#0e3a36;border-color:var(--teal);transform:scale(1.015)}.shimmer{height:8px;border-radius:9px;background:var(--soft);overflow:hidden;margin-top:12px}.shimmer i{display:block;height:100%;width:65%;border-radius:9px;background:linear-gradient(90deg,var(--dew),var(--teal),var(--dew));background-size:200% 100%;animation:shim2 2.4s linear infinite}@keyframes shim2{to{background-position:-200% 0}}.drop{position:absolute;display:block;width:var(--s,26px);height:var(--s,26px);border-radius:50% 50% 50% 8%;background:linear-gradient(145deg,#a9e8da,#3e9e8c);transform:rotate(-45deg);animation:drift var(--d,7s) ease-in-out infinite;animation-delay:var(--dl,0s);opacity:.92}.drop-still{position:static;display:inline-block;animation:none;margin-bottom:8px}@keyframes drift{50%{translate:0 -16px}}@keyframes floaty{50%{transform:translateY(-10px)}}.jarbadge{position:absolute;right:0;bottom:12px;z-index:3;background:var(--deep);color:#fff;border-radius:999px;padding:6px 15px;font-size:.87rem;font-weight:600;display:flex;gap:8px;align-items:center}.jarbadge i{width:9px;height:9px;border-radius:50%;background:var(--dew);animation:pulse 1.8s infinite}@keyframes pulse{0%{box-shadow:0 0 #7edcc8b3}70%{box-shadow:0 0 0 9px #7edcc800}to{box-shadow:0 0 #7edcc800}}@media(max-width:760px){.hero{grid-template-columns:1fr;padding-top:24px}.hero-art{min-height:300px}}.band{background:var(--card);border-block:1px solid var(--line)}.band .wrap{padding-block:38px}.ways{display:grid;gap:22px;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr))}.ways h3{margin-bottom:3px}.foot{padding:24px 16px;text-align:center;color:var(--mute);font-size:.9rem}.price{font-size:1.9rem;font-weight:700}.tbl{width:100%;border-collapse:collapse;font-size:.94rem}.tbl th{text-align:left;font-weight:600;color:var(--mute);font-size:.87rem}.tbl td,.tbl th{padding:8px;border-bottom:1px solid var(--line);vertical-align:top}.scrollx{overflow-x:auto}.jar{width:84px;height:105px;flex:none}.jar-water{transition:transform 1.4s var(--ease)}.jar-wave{animation:wave 3.2s linear infinite}@keyframes wave{to{transform:translate(80px)}}.days{display:flex;gap:6px;margin-top:6px}.days i{width:15px;height:15px;border-radius:50% 50% 50% 12%;transform:rotate(-45deg);background:var(--soft);border:1px solid var(--line)}.days i.on{background:var(--logo);border-color:var(--logo);animation:pop .5s var(--ease) both}@keyframes pop{0%{scale:.2}60%{scale:1.2}}.stat b{display:block;font-size:1.65rem;line-height:1.2}.stat{font-size:.9rem;color:var(--mute)}.stat b{color:var(--ink)}.tree details{border-bottom:1px solid var(--line)}.tree summary{cursor:pointer;padding:10px 4px;font-weight:600;min-height:44px}.tree .topic{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:8px 4px 8px 16px;border-top:1px dashed var(--line)}.exam{min-height:100dvh;display:flex;flex-direction:column;background:var(--mint)}.ex-top{position:sticky;top:0;z-index:10;background:var(--card);border-bottom:1px solid var(--line);padding:8px 14px;display:flex;align-items:center;gap:10px;justify-content:space-between}.timer{font-weight:700;font-variant-numeric:tabular-nums;font-size:1.2rem;padding:1px 12px;border-radius:9px;background:var(--soft)}.timer.low{background:var(--bad-s);color:var(--bad);animation:beat 1s infinite}@keyframes beat{50%{transform:scale(1.05)}}.saved{font-size:.8rem;color:var(--mute);display:flex;gap:5px;align-items:center}.saved i{width:7px;height:7px;border-radius:50%;background:var(--logo)}.saved.off i{background:var(--orange)}.progress{height:4px;background:var(--soft)}.progress i{display:block;height:100%;background:var(--teal);transition:width .4s var(--ease)}.ex-body{flex:1;width:100%;max-width:720px;margin:0 auto;padding:18px 14px 110px}.q-anim{animation:slideq .3s var(--ease)}.q-anim.back{animation-name:slideb}@keyframes slideq{0%{opacity:0;transform:translate(26px)}}@keyframes slideb{0%{opacity:0;transform:translate(-26px)}}.q-text{font-size:1.16rem;font-weight:600;line-height:1.7;margin-bottom:14px}.q-sec{color:var(--mute);font-size:1rem;font-weight:500;display:block;margin-top:3px}.opt{position:relative;display:flex;gap:12px;align-items:center;width:100%;text-align:left;min-height:56px;margin-bottom:10px;padding:10px 14px;border:1.5px solid var(--line);border-radius:13px;background:var(--card);cursor:pointer;transition:border-color .2s,background .25s,transform .12s;overflow:hidden}.opt:active{transform:scale(.985)}.opt:hover{border-color:var(--logo)}.opt.sel{border-color:var(--teal);background:#0e3a36}.opt .mark{flex:none;width:28px;height:28px;border-radius:50%;border:2px solid var(--line);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;transition:background .2s,border-color .2s,color .2s;color:var(--mute)}.opt.multi .mark{border-radius:8px}.opt.sel .mark{background:var(--teal);border-color:var(--teal);color:#fff}.opt .ck{stroke-dasharray:30;stroke-dashoffset:30;animation:drawck .3s .05s forwards}@keyframes drawck{to{stroke-dashoffset:0}}.opt.right{border-color:var(--teal);background:var(--good-s)}.opt.wrong{border-color:var(--bad);background:var(--bad-s)}.opt small{display:block;color:var(--mute);font-weight:400}.opt:after{content:"";position:absolute;left:var(--x,50%);top:var(--y,50%);width:12px;height:12px;border-radius:50%;background:#3e9e8c52;transform:translate(-50%,-50%) scale(0);opacity:0}.opt.tap:after{animation:ripple .55s ease-out}@keyframes ripple{0%{opacity:1;transform:translate(-50%,-50%) scale(0)}to{opacity:0;transform:translate(-50%,-50%) scale(40)}}.ex-foot{position:fixed;bottom:0;left:0;right:0;background:var(--card);border-top:1px solid var(--line);padding:9px 12px calc(9px + env(safe-area-inset-bottom));display:flex;gap:8px;z-index:10}.ex-foot .btn{flex:1;padding-inline:8px}.pal{display:grid;grid-template-columns:repeat(auto-fill,minmax(46px,1fr));gap:8px;margin:14px 0}.pal button{height:46px;border-radius:10px;border:1.5px solid var(--line);background:var(--card);font-weight:600;cursor:pointer}.pal .ans{background:var(--logo);border-color:var(--logo);color:#fff}.pal .flag{border-color:var(--orange);box-shadow:inset 0 0 0 2px var(--orange)}.pal .cur{outline:2px solid var(--ink);outline-offset:1px}.legend{display:flex;gap:12px;flex-wrap:wrap;font-size:.85rem;color:var(--mute)}.seg{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--card)}.seg button{border:0;background:none;padding:4px 10px;min-height:34px;font-size:.84rem;font-weight:600;color:var(--mute);cursor:pointer;transition:background .2s}.seg button[aria-pressed=true]{background:var(--teal);color:#fff}.kid .q-text{font-size:1.5rem}.kid .opt{min-height:74px;font-size:1.25rem;border-radius:20px}.kid .opt .mark{width:36px;height:36px}.kid .ex-foot .btn{min-height:58px;font-size:1.15rem}.speak{border:0;background:#0e2f33;border-radius:50%;width:52px;height:52px;font-size:1.4rem;cursor:pointer;margin-bottom:10px}.stars{display:flex;justify-content:center;gap:10px;font-size:3rem;color:#e9a820;margin:6px 0}.stars span{animation:pop .6s var(--ease) both}.stars span:nth-child(2){animation-delay:.2s}.stars span:nth-child(3){animation-delay:.4s}.stars .off{color:#e8e2d2}.ring{position:relative;width:170px;height:170px;margin:0 auto 8px}.ring svg{transform:rotate(-90deg)}.ring circle{fill:none;stroke-width:13}.ring .bg{stroke:var(--soft)}.ring .fg{stroke:var(--logo);stroke-linecap:round;transition:stroke-dashoffset 1.3s var(--ease)}.ring div{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}.ring b{font-size:2.1rem;line-height:1}.tri{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;text-align:center}.rev{border-top:1px solid var(--line);padding-top:12px;margin-top:12px}.expl{background:var(--mint);border-left:3px solid var(--logo);padding:9px 12px;border-radius:0 9px 9px 0;font-size:.95rem;margin-top:6px}.pipe{display:flex;gap:4px;margin-bottom:16px;overflow-x:auto}.pipe span{flex:1;min-width:66px;font-size:.78rem;text-align:center;color:var(--mute);padding-top:9px;border-top:4px solid var(--soft);transition:border-color .5s,color .5s}.pipe span.done{border-color:var(--logo);color:var(--ink);font-weight:600}.bprow{display:grid;grid-template-columns:1fr repeat(3,62px) 34px;gap:6px;align-items:center;margin-bottom:8px;animation:rise .3s var(--ease)}.bprow input{padding:8px 4px;text-align:center}.bpgrid-head{display:grid;grid-template-columns:1fr repeat(3,62px) 34px;gap:6px;font-size:.8rem;color:var(--mute);font-weight:600;text-align:center}.item{border:1px solid var(--line);border-radius:12px;padding:12px;margin-bottom:10px;background:var(--card);animation:rise .35s var(--ease) both;transition:border-color .3s,background .3s}.item.ok{border-color:var(--logo);background:#0c2e2b}.item.ai{border-left:4px solid var(--orange)}.optline{display:flex;gap:7px;font-size:.93rem}.optline.c{font-weight:600;color:var(--teal-d)}.tree-edit{border:1px solid var(--line);border-radius:12px;padding:10px;margin-bottom:10px;background:var(--card)}.tree-edit .sub{margin:8px 0 0 12px;padding-left:10px;border-left:2px solid var(--soft)}.conf-low{color:#ffc48a;font-weight:600}.mini{display:grid;grid-template-columns:1fr 1fr 62px 62px auto;gap:6px;align-items:center;margin-bottom:6px}.mini input{min-height:38px;padding:6px 8px}@media(max-width:640px){.mini{grid-template-columns:1fr 1fr}}.drop-zone{display:block;border:2px dashed var(--logo);border-radius:14px;padding:26px;text-align:center;background:#0a2226;cursor:pointer;transition:background .2s}.drop-zone:hover{background:var(--soft)}.printbar{background:var(--card);padding:10px 16px;border-bottom:1px solid var(--line);display:flex;gap:8px;flex-wrap:wrap;align-items:center}.paper{background:var(--card);max-width:800px;margin:18px auto;padding:30px;color:#000;position:relative;overflow:hidden}.paper h1{font-size:1.4rem;text-align:center;margin:0}.paper .meta{display:flex;justify-content:space-between;border-block:1px solid #000;padding:4px 0;margin:8px 0 14px;font-size:.92rem}.pq{break-inside:avoid;margin-bottom:12px}.pq ol{list-style:none;margin:3px 0 0 16px;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:1px 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