/* Practice packs and phone tracing, ported from Paaro's paper maker page (public/paper/index.html,
 * built from content/paper/mockup-v3.html). Lives in its own document (public/tools/pack.html, shown in
 * an iframe), so nothing here touches Shaaro's app.css. */
:root{--g:#0F7A66;--g2:#0B7F58;--gd:#0B5C4D;--gl:#E3F5EC;--sun:#FFC93C;--sunl:#FFF4D6;--sund:#7A5A06;--co:#F08A6B;--col:#FDEBE4;--cod:#9A3B1E;
--ink:#17302A;--ink2:#4A615A;--ink3:#667B74;--bg:#F2F7F4;--line:#DCE8E2;--edge:#C7DAD1;
--f:'Noto Sans','Noto Sans Bengali',system-ui,sans-serif;--sh:0 1px 2px rgba(23,48,42,.06),0 4px 14px rgba(23,48,42,.05)}
*{box-sizing:border-box}html,body{margin:0}body{font-family:var(--f);font-size:15px;line-height:1.55;color:var(--ink);background:var(--bg)}
h1,h2,h3{margin:0;line-height:1.25;font-weight:800;text-wrap:balance}h1{font-size:30px}h2{font-size:18px}h3{font-size:15.5px;font-weight:700}p{margin:0}
button,input,select{font:inherit;color:inherit}button{cursor:pointer}a{color:var(--g2)}
svg.i{width:20px;height:20px;flex:0 0 20px}svg.s{width:16px;height:16px;flex:0 0 16px}
.muted{color:var(--ink2)}.faint{color:var(--ink3)}.small{font-size:13.5px}.tiny{font-size:12.5px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.between{justify-content:space-between}.grow{flex:1;min-width:0}
.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--sh);min-width:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:11px 18px;font-weight:700;background:var(--g);color:#fff;font-size:15px;white-space:nowrap;text-decoration:none}
.btn:hover{background:var(--g2)}.btn.gh{background:#fff;color:var(--g2);border:1.5px solid var(--edge)}.btn.gh:hover{background:var(--gl)}.btn.sm{padding:6px 12px;font-size:13.5px;border-radius:10px}.btn.wide{width:100%}.btn.sun{background:var(--sun);color:var(--ink)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.chip{display:inline-flex;align-items:center;gap:5px;font-size:12.5px;font-weight:700;border-radius:99px;padding:2px 10px;white-space:nowrap}
.c-x{background:#EEF2F0;color:var(--ink2)}.c-s{background:var(--sunl);color:var(--sund)}
.k-g{background:var(--gl);color:var(--gd)}.k-y{background:var(--sunl);color:var(--sund)}.k-r{background:var(--col);color:var(--cod)}
.d-g{background:var(--g)}.d-y{background:var(--sun)}.d-r{background:var(--co)}
.dot{width:10px;height:10px;border-radius:50%;display:inline-block;flex:0 0 10px}
/* demo bar */
.demo{position:sticky;top:0;z-index:80;background:#17302A;color:#fff;font-size:13px}
.demo .in{max-width:1440px;margin:0 auto;padding:6px 14px;display:flex;align-items:center;gap:6px;overflow-x:auto}
.demo b{white-space:nowrap;margin-right:4px;color:var(--sun)}
.demo button{border:0;background:none;color:#cfe3da;padding:5px 10px;border-radius:8px;white-space:nowrap;font-weight:600;font-size:13px}
.demo button.on{background:var(--g);color:#fff}.demo .sep{width:1px;height:18px;background:rgba(255,255,255,.3);flex:0 0 1px}
#toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 18px;border-radius:12px;font-weight:600;opacity:0;transition:opacity .2s;z-index:300;pointer-events:none;max-width:90vw;text-align:center;font-size:14px}
/* site header */
.wrap{max-width:1360px;margin:0 auto;padding:0 24px}
.hdr{background:#fff;border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;gap:14px;height:62px}
.hdr .lg svg{height:30px;width:auto;display:block}
.nav{display:flex;align-items:center}.nav a{padding:6px 14px;color:var(--ink2);font-weight:600;text-decoration:none;font-size:14px}.nav a.on{color:var(--gd)}.nav i{width:1px;height:16px;background:var(--line)}
.lang{display:inline-flex;border:1.5px solid var(--edge);border-radius:99px;overflow:hidden}.lang button{border:0;background:#fff;padding:4px 12px;font-weight:700;font-size:13px;color:var(--ink2)}.lang button.on{background:var(--gd);color:#fff}
.hero{padding:26px 0 18px}
.hero h1{font-size:32px;color:var(--ink)}.hero h1 em{font-style:normal;color:var(--g2)}
.hero .sub{margin-top:8px;color:var(--ink2);font-size:16px}
.trust{display:flex;gap:16px;flex-wrap:wrap;margin-top:12px;font-size:13.5px;color:var(--ink2)}.trust span{display:inline-flex;gap:6px;align-items:center}.trust svg{color:var(--g)}
/* builder layout */
.lay{display:grid;grid-template-columns:420px minmax(0,1fr);gap:22px;align-items:start;padding-bottom:30px}
.form{display:flex;flex-direction:column;gap:14px}
.fs{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 16px;box-shadow:var(--sh)}
.fs>.lb{display:flex;align-items:center;gap:8px;font-weight:800;font-size:14.5px;margin-bottom:9px}
.fs>.lb .n{width:22px;height:22px;border-radius:50%;background:var(--gl);color:var(--gd);display:grid;place-items:center;font-size:12.5px;flex:0 0 22px}
.seg{display:flex;border:1.5px solid var(--edge);border-radius:12px;overflow:hidden;background:#fff}
.seg button{flex:1;border:0;background:#fff;padding:8px 6px;font-weight:700;font-size:14.5px;color:var(--ink2);border-left:1.5px solid var(--edge)}.seg button:first-child{border-left:0}
.seg button.on{background:var(--gd);color:#fff}.seg button:disabled{color:#a9bab3;background:#f7faf8;cursor:not-allowed}
.sg4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.opt{display:flex;align-items:center;gap:8px;border:1.5px solid var(--edge);background:#fff;border-radius:12px;padding:8px 10px;font-weight:700;font-size:14px;color:var(--ink2);text-align:left;min-width:0}
.opt svg{color:var(--g)}.opt.on{border-color:var(--g);background:var(--gl);color:var(--gd)}
.chl{display:flex;flex-direction:column;gap:6px;max-height:300px;overflow:auto;padding-right:4px;overscroll-behavior:contain}
.chi{display:flex;align-items:center;gap:10px;border:1.5px solid var(--line);border-radius:12px;padding:8px 10px;background:#fff;text-align:left;width:100%;font-size:14px}
.chi .bx{width:20px;height:20px;border-radius:6px;border:2px solid var(--edge);flex:0 0 20px;display:grid;place-items:center;color:#fff}
.chi.on{border-color:var(--g);background:#F7FCF9}.chi.on .bx{background:var(--g);border-color:var(--g)}
.chi:disabled{cursor:default;color:var(--ink3);background:#FAFCFB}
.fld{display:flex;flex-direction:column;gap:4px;margin-top:8px}.fld:first-of-type{margin-top:0}
.fld label{font-size:13px;font-weight:700;color:var(--ink2)}
.fld input{border:1.5px solid var(--edge);border-radius:10px;padding:9px 12px;font-size:15px;background:#fff;width:100%}
.fld input:focus{outline:2px solid var(--g);border-color:var(--g)}
.tg{display:flex;align-items:center;gap:10px;padding:6px 0}.tg+.tg{border-top:1px solid var(--line)}
.sw{width:42px;height:24px;border-radius:99px;background:#CBD8D2;border:0;position:relative;flex:0 0 42px;padding:0}.sw::after{content:'';position:absolute;top:3px;left:3px;width:18px;height:18px;border-radius:50%;background:#fff;transition:left .15s}
.sw.on{background:var(--g)}.sw.on::after{left:21px}.sw:disabled{opacity:.5}
.mini{display:flex;border:1.5px solid var(--edge);border-radius:9px;overflow:hidden}.mini button{border:0;background:#fff;padding:3px 10px;font-weight:700;font-size:13px;border-left:1.5px solid var(--edge)}.mini button:first-child{border-left:0}.mini button.on{background:var(--gd);color:#fff}
.sum{display:flex;gap:8px;flex-wrap:wrap;font-size:13px}
.make{display:flex;flex-direction:column;gap:8px}
.make .btn{padding:14px;font-size:16.5px}
/* preview */
.pvcol{position:sticky;top:46px;display:flex;flex-direction:column;gap:12px;min-width:0}
.pvbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.tabs{display:flex;background:#fff;border:1.5px solid var(--edge);border-radius:12px;overflow:hidden}
.tabs button{border:0;background:#fff;padding:7px 14px;font-weight:700;font-size:14px;color:var(--ink2);border-left:1.5px solid var(--edge);white-space:nowrap}.tabs button:first-child{border-left:0}.tabs button.on{background:var(--gl);color:var(--gd)}
.pvbox{background:#DDE6E1;border-radius:16px;padding:18px;max-height:calc(100vh - 210px);overflow:auto;min-height:420px}
.pvbox .sheet{margin:0 auto 16px;box-shadow:0 2px 10px rgba(23,48,42,.18);background:#fff}
.pvbox .sheet:last-child{margin-bottom:0}
.sheet>.page{transform-origin:top left}
.empty{background:#fff;border:1.5px dashed var(--edge);border-radius:16px;padding:40px 24px;text-align:center;color:var(--ink2)}
.dl4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.dlc{display:flex;flex-direction:column;gap:4px;background:#fff;border:1.5px solid var(--line);border-radius:14px;padding:12px 14px;text-align:left;box-shadow:var(--sh);min-width:0}
.dlc:hover{border-color:var(--g)}
.dlc .t{display:flex;align-items:center;gap:9px;font-weight:800;font-size:15px}
.dlc .t .ib{width:32px;height:32px;border-radius:10px;display:grid;place-items:center;flex:0 0 32px;background:var(--gl);color:var(--gd)}
.dlc .t .ib svg{width:18px;height:18px}
.dlc .d{font-size:12.5px;color:var(--ink2)}
.dlbox{display:flex;flex-direction:column;gap:10px}.dlbox .row .tiny{color:var(--ink2)}
.flash{animation:fl 1.2s ease}@keyframes fl{0%{box-shadow:0 0 0 0 rgba(14,159,110,.6)}100%{box-shadow:0 0 0 18px rgba(14,159,110,0)}}
.how4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:8px 0 36px}
.how4 .card{padding:14px 16px}.how4 .t>span:last-child{white-space:nowrap}.how4 .t{display:flex;gap:10px;align-items:center;font-weight:800}.how4 .t .ib{width:34px;height:34px;border-radius:10px;background:var(--sunl);color:var(--sund);display:grid;place-items:center;flex:0 0 34px}
.how4 p{font-size:13.5px;color:var(--ink2);margin-top:6px}
.cardpv{display:grid;grid-template-columns:1fr 1fr;gap:14px}.cardpv canvas{width:100%;height:auto;border-radius:12px;box-shadow:0 2px 10px rgba(23,48,42,.18);display:block;background:#fff}
.cmt{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:14px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.stick{display:none}
/* phone frame (student) */
.stage{display:grid;grid-template-columns:minmax(0,1fr) 400px minmax(0,1fr);gap:28px;max-width:1360px;margin:20px auto 40px;padding:0 24px;align-items:start}
.side-note{padding-top:30px}.side-note .card{padding:14px 16px;font-size:13.5px;color:var(--ink2)}.side-note h3{color:var(--ink);margin-bottom:6px}
.phone{border:10px solid #17302A;border-radius:36px;overflow:hidden auto;box-shadow:0 20px 50px rgba(0,0,0,.2);height:800px;background:var(--bg);position:relative}
.ph-top{display:flex;align-items:center;gap:10px;padding:12px 16px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.ph-top svg{height:24px;width:auto}
.ph-in{padding:16px}
.prog{height:8px;background:var(--line);border-radius:99px;overflow:hidden}.prog i{display:block;height:100%;background:var(--g);border-radius:99px}
.qopt{display:flex;align-items:center;gap:12px;width:100%;text-align:left;background:#fff;border:1.5px solid var(--edge);border-radius:14px;padding:12px 14px;font-size:16px;margin-top:10px;min-height:52px}
.qopt .lt{width:30px;height:30px;border-radius:50%;border:1.5px solid var(--edge);display:grid;place-items:center;font-weight:800;flex:0 0 30px;font-size:14px;color:var(--ink2)}
.qopt.on{border-color:var(--g);background:var(--gl)}.qopt.on .lt{background:var(--g);border-color:var(--g);color:#fff}
.fr{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;line-height:1.1;font-weight:700;margin:0 2px}
.fr i{font-style:normal;padding:0 3px}.fr i:first-child{border-bottom:1.6px solid currentColor}
.score{background:linear-gradient(160deg,var(--gd),var(--g));color:#fff;border-radius:20px;padding:20px;text-align:center;position:relative;overflow:hidden}
.score .big{font-size:46px;font-weight:800;line-height:1.1}
.score::after{content:'';position:absolute;width:70px;height:70px;border-radius:50%;background:var(--sun);right:-18px;top:-18px;opacity:.95}
.skl{display:flex;align-items:center;gap:10px;padding:10px 0;border-top:1px solid var(--line);font-size:14.5px}.skl:first-child{border-top:0}
.rv{border-top:1px solid var(--line);padding:10px 0;font-size:14px}.rv:first-child{border-top:0}.rv .ok{color:var(--g2)}.rv .no{color:var(--cod)}
/* teacher results */
.tres{max-width:1100px;margin:22px auto 40px;padding:0 24px}
.st4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.st4 .card{padding:14px 16px}.st4 .t{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--ink2);font-weight:700}.st4 .t svg{color:var(--g)}.st4 .v{font-size:26px;font-weight:800;margin-top:4px}
.sbar{display:flex;height:14px;border-radius:99px;overflow:hidden;background:var(--line)}.sbar i{display:block;height:100%}
.leg{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;color:var(--ink2)}.leg span{display:inline-flex;gap:6px;align-items:center}
.skrow{display:grid;grid-template-columns:200px minmax(0,1fr);gap:16px;align-items:center;padding:12px 0;border-top:1px solid var(--line)}.skrow:first-child{border-top:0}
.skrow.hi{background:var(--sunl);margin:0 -18px;padding:12px 18px;border-radius:12px}
.lock{position:relative}.lock .blur{filter:blur(5px);pointer-events:none;user-select:none}
.lock .ov{position:absolute;inset:0;display:grid;place-items:center}
.lock .ov .card{max-width:440px;text-align:center}
.mbg{position:fixed;inset:0;background:rgba(23,48,42,.28);display:grid;place-items:center;z-index:200;padding:16px}
.modal{background:#fff;border-radius:20px;max-width:420px;width:100%;padding:22px;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.otp{letter-spacing:10px;text-align:center;font-size:22px !important;font-weight:800}
/* ===== A4 paper (signature style) ===== */
#meas{position:absolute;left:-12000px;top:0;visibility:hidden}
.page{width:210mm;height:297mm;background:#fff;color:#1d2522;padding:25.4mm 17.8mm 17.8mm 25.4mm;display:flex;flex-direction:column;font-family:'Noto Sans Bengali','Noto Sans',sans-serif;font-size:9.5pt;line-height:1.45;overflow:hidden;position:relative}
.page .ph{display:grid;grid-template-columns:23mm 1fr 23mm;gap:4mm;align-items:center}
.page .tile{border:1.2pt solid #0B5C4D;border-radius:3mm;height:19mm;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;line-height:1.15}
.page .tile small{font-size:9pt;color:#4A615A}.page .tile b{font-size:17pt;color:#0B5C4D}
.page .tile.set{background:#0B5C4D}.page .tile.set small{color:#CFE9DE}.page .tile.set b{color:#fff;font-size:20pt}
.page .tile.set::after{content:'';position:absolute;right:-1.6mm;top:-1.6mm;width:3.6mm;height:3.6mm;border-radius:50%;background:#FFC93C;border:.8pt solid #fff}
.page .ctr{text-align:center}.page .ctr .sch{font-size:15pt;font-weight:800;line-height:1.25;color:#17302A}
.page .ctr .ex{font-size:11pt;font-weight:700;color:#0B5C4D;margin-top:1mm}.page .ctr .cl{font-size:10pt;margin-top:.6mm;color:#33443f}
.page .rule{position:relative;height:0;border-top:1.1pt solid #0F7A66;margin:3.2mm 2.2mm 2.4mm 0}
.page .rule::after{content:'';position:absolute;right:-2.4mm;top:-1.85mm;width:2.6mm;height:2.6mm;border-radius:50%;background:#FFC93C}
.page .rule::before{content:'';position:absolute;right:1.6mm;top:-1.25mm;width:1.4mm;height:1.4mm;border-radius:50%;background:#FFC93C;opacity:.7}
.page .meta{display:flex;justify-content:space-between;gap:6mm;font-size:9.5pt;color:#33443f}
.page .meta b{color:#17302A}
.page .blank{display:inline-block;border-bottom:.7pt dotted #667B74;min-width:30mm;transform:translateY(-1pt)}
.page .hd2{display:flex;align-items:center;gap:3mm;font-size:9.5pt;color:#33443f}
.page .hd2 .st{background:#0B5C4D;color:#fff;border-radius:1.6mm;padding:.2mm 2.2mm;font-weight:700}
.page .hd2 .grow{font-weight:700;color:#17302A}
.page .pb{flex:1;min-height:0;display:grid;grid-template-columns:1fr 1fr;gap:0 7mm;margin-top:2.5mm;position:relative}
.page .pb::before{content:'';position:absolute;left:50%;top:1mm;bottom:0;border-left:.6pt solid #DCE8E2}
.page .pb::after{content:'';position:absolute;left:calc(50% - 1.1mm);top:-1.2mm;width:2.2mm;height:2.2mm;border-radius:50%;background:#FFC93C}
.page .col{min-height:0;overflow:hidden}
.page .sec{display:flex;align-items:center;gap:2mm;margin:1mm 0 1.2mm;font-weight:800;font-size:10.5pt;color:#0B5C4D}
.page .sec::before{content:'';width:1.2mm;height:4mm;border-radius:1mm;background:#0F7A66}
.page .sec span{margin-left:auto;font-weight:600;font-size:9pt;color:#4A615A}
.page .ins{font-size:9pt;color:#4A615A;margin-bottom:1.6mm;line-height:1.4}
.page .q{display:grid;grid-template-columns:6.4mm 1fr;gap:0 1.6mm;margin-bottom:2.1mm;break-inside:avoid}
.page .qn{width:5.6mm;height:5.6mm;border-radius:50%;border:.9pt solid #0F7A66;color:#0B5C4D;font-weight:800;font-size:9pt;display:grid;place-items:center;margin-top:.4mm;line-height:1}
.page .qt{font-weight:600}
.page .os{display:grid;grid-template-columns:1fr 1fr;gap:.2mm 3mm;margin-top:.5mm;font-size:9pt}
.page .os.one{grid-template-columns:1fr}
.page .os .ol{color:#0B5C4D;font-weight:700;margin-right:.8mm}
.page .mk{float:right;font-size:9pt;color:#4A615A;font-weight:600;margin-left:2mm}
.page .cqp{display:grid;grid-template-columns:5mm 1fr;margin-top:.6mm}
.page .fr{margin:0 .6mm;font-weight:600}.page .fr i{padding:0 .5mm}.page .fr i:first-child{border-bottom-width:.8pt}
.page .pf{display:flex;align-items:flex-end;gap:3mm;border-top:.6pt solid #DCE8E2;padding-top:2mm;margin-top:2mm;font-size:9pt;color:#4A615A}
.page .pf .mk2{display:flex;align-items:center;gap:1.6mm;font-weight:700;color:#0B5C4D}
.page .pf .mk2 svg{width:4mm;height:4mm}
.page .pf .qr{width:17mm;height:17mm;flex:0 0 17mm;display:grid;place-items:center}
.page .pf .qr img,.page .pf .qr canvas{width:17mm !important;height:17mm !important;display:block}
.page .pf .qrf{width:17mm;height:17mm;border:.8pt dashed #0F7A66;border-radius:1.5mm;display:grid;place-items:center;text-align:center;font-size:9pt;line-height:1.1;color:#0B5C4D;font-weight:700}
.page .pf .scan{line-height:1.35;text-align:right}
.page .pf .scan b{color:#17302A}
.page .kg{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));border:.8pt solid #DCE8E2;border-radius:2mm;overflow:hidden;margin-top:3mm}
.page .kg div{padding:1.2mm 2mm;border-right:.6pt solid #DCE8E2;border-bottom:.6pt solid #DCE8E2;font-size:10pt;display:flex;gap:2mm;align-items:center}
.page .kg div b{color:#0B5C4D}.page .kg div .qn{width:5mm;height:5mm;font-size:9pt}
.page .kx{display:grid;grid-template-columns:6.4mm 1fr;gap:0 1.6mm;margin-bottom:1.6mm;font-size:9.5pt;line-height:1.4}
.page .kx b{color:#0B5C4D}
.page .kt{font-size:9pt;color:#4A615A}
#printArea{display:none}
@page{size:A4;margin:0}
@media print{
 html,body{background:#fff;height:auto !important;padding:0 !important;margin:0 !important}
 body>*:not(#printArea){display:none !important}
 #printArea{display:block}
 #printArea .page{break-after:page;page-break-after:always;height:296mm}
 #printArea .page:last-child{break-after:auto;page-break-after:auto}
 *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
}
@media (max-width:1100px){.lay{grid-template-columns:360px minmax(0,1fr)}.dl4,.how4,.st4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:860px){
 .wrap{padding:0 16px}.lay{grid-template-columns:minmax(0,1fr)}.pvcol{position:static}.pvbox{max-height:none;padding:10px;min-height:0}
 .hero h1{font-size:25px}.hero .sub{font-size:15px}.nav{display:none}
 .stick{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:90;background:#fff;border-top:1px solid var(--line);padding:10px 16px;gap:10px;align-items:center;box-shadow:0 -6px 18px rgba(23,48,42,.08)}
 body.vb{padding-bottom:76px} body.vs .hdr{display:none} body.vs .ph-top .chip{margin-right:0}
 .stage{grid-template-columns:minmax(0,1fr);padding:0;margin:0}.side-note{display:none}
 .phone{border:0;border-radius:0;height:auto;min-height:calc(100vh - 40px);box-shadow:none;overflow:visible}
 .ph-top{top:38px}
 .tres{padding:0 16px}.skrow{grid-template-columns:minmax(0,1fr);gap:6px}
 .cardpv{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:480px){.dl4,.how4,.st4{gap:8px}.dlc{padding:10px}.dlc .t{font-size:14px}.sg4{grid-template-columns:repeat(2,minmax(0,1fr))}.hdr .wrap{height:56px}.hdr .lg svg{height:26px}}
.grp4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1.5px solid var(--edge);border-radius:12px;overflow:hidden;background:#fff}
.grp4 button{border:0;border-left:1.5px solid var(--edge);background:#fff;padding:8px 6px;font-weight:700;font-size:13px;color:var(--ink2);line-height:1.3}.grp4 button:first-child{border-left:0}.grp4 button.on{background:var(--gl);color:var(--gd)}
.empty.sm{padding:16px;display:flex;flex-direction:column;gap:4px;align-items:center}
.lnk{border:0;background:none;color:var(--g2);font-weight:700;font-size:13px;text-decoration:underline;padding:0}
.hint{display:flex;gap:8px;align-items:flex-start;background:var(--sunl);border:1px solid #F1DE9C;border-radius:12px;padding:9px 12px;font-size:13px;color:#5c4407;margin-top:8px}.hint svg{color:var(--sund);margin-top:2px}
.rvw{display:flex;flex-direction:column;gap:12px}
.rvhd{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:16px;align-items:start;background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 16px;box-shadow:var(--sh)}
.tp{background:var(--bg);border-radius:12px;padding:10px 12px}.tpn{font-weight:800;color:var(--sund);font-size:14px}.tpn.ok{color:var(--gd)}
.rvl{display:flex;flex-direction:column;gap:8px}
.rq{background:#fff;border:1.5px solid var(--line);border-radius:14px;padding:10px 12px}.rq.on{border-color:#9FD9C1;background:#FAFEFC}.rq.op{box-shadow:var(--sh)}
.rqh{display:flex;gap:10px;align-items:flex-start}
.qn2{width:28px;height:28px;border-radius:50%;border:1.5px solid var(--g);color:var(--gd);display:grid;place-items:center;font-weight:800;font-size:13px;flex:0 0 28px;margin-top:2px}
.rqt{flex:1;min-width:0;border:0;background:none;text-align:left;padding:0;display:flex;flex-direction:column;font-size:15px;font-weight:600}
.tick{display:inline-flex;align-items:center;gap:6px;border:1.5px solid var(--edge);background:#fff;color:var(--ink2);border-radius:99px;padding:6px 12px;font-weight:700;font-size:13.5px;white-space:nowrap;flex:0 0 auto}
.tick svg{opacity:.35}.tick.on{background:var(--g);border-color:var(--g);color:#fff}.tick.on svg{opacity:1}
.rqb{margin:10px 0 2px 38px;border-top:1px dashed var(--line);padding-top:10px}
.ans{display:grid;grid-template-columns:1fr 1fr;gap:6px}.ans div{border:1px solid var(--line);border-radius:10px;padding:6px 10px;font-size:14px;display:flex;align-items:center;gap:6px;flex-wrap:wrap}.ans div.ok{border-color:var(--g);background:var(--gl)}
.ol2{font-weight:800;color:var(--gd)}.okt{color:var(--gd);display:inline-flex;gap:3px;align-items:center;font-size:12.5px}
.ed{margin-top:10px;border:1px solid var(--line);border-radius:12px;padding:8px 12px;background:#FCFDFC}.ed summary{cursor:pointer;font-weight:700;font-size:13.5px;color:var(--g2);display:flex;gap:6px;align-items:center}
.eo{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-top:8px}.eo .oi{flex:1;min-width:0;border:1.5px solid var(--edge);border-radius:8px;padding:6px 8px;font-size:14px}
.draft{display:flex;gap:8px;align-items:center;background:var(--sunl);border:1px solid #F1DE9C;color:#5c4407;border-radius:12px;padding:8px 12px;font-size:13.5px;margin:0 auto 12px;max-width:794px}
.page .q.pend{outline:1.4pt dashed #FFC93C;outline-offset:1mm;background:#FFFBEB;border-radius:1.5mm}
.dl4.locked .dlc{opacity:.55}.dl4.locked .dlc:hover{border-color:var(--line)}
.hcheck{display:flex;align-items:center;gap:12px;width:100%;margin-top:14px;border:1.5px solid var(--edge);border-radius:14px;background:#F7FAF8;padding:14px;font-weight:700;font-size:15.5px;text-align:left}
.hcheck .hb{width:28px;height:28px;border-radius:8px;border:2px solid var(--edge);background:#fff;display:grid;place-items:center;flex:0 0 28px;color:#fff}
.hcheck.ok .hb{background:var(--g);border-color:var(--g)}
.spin{width:16px;height:16px;border-radius:50%;border:2.5px solid var(--line);border-top-color:var(--g);animation:sp .7s linear infinite;display:block}@keyframes sp{to{transform:rotate(360deg)}}
.ben{display:flex;flex-direction:column;gap:8px;margin-top:12px}.ben .bi{width:28px;height:28px;border-radius:9px;background:var(--gl);color:var(--gd);display:grid;place-items:center;flex:0 0 28px}
.page .tile{height:21mm}.page .tile.set b{font-size:26pt}
@media (max-width:860px){#tabs{display:grid;grid-template-columns:1fr 1fr;width:100%}#tabs button{border-left:0;border-top:1.5px solid var(--edge)}#tabs button:nth-child(-n+2){border-top:0}#tabs button:nth-child(even){border-left:1.5px solid var(--edge)}#setTabs{width:100%}#setTabs button{flex:1}.rqh{flex-wrap:wrap}.rqt{flex:1 1 calc(100% - 40px)}.tick{margin-left:38px}.rvhd{grid-template-columns:minmax(0,1fr)}.rqb{margin-left:0}.ans,.eo{grid-template-columns:minmax(0,1fr)}.grp4 button{font-size:12px;padding:7px 3px}}
/* mode bar */
.mbar{background:#fff;border-bottom:1px solid var(--line)}
.modes{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:10px 0;max-width:720px}
.modes button{display:flex;gap:10px;align-items:center;text-align:left;border:1.5px solid var(--edge);background:#fff;border-radius:14px;padding:9px 12px;color:var(--ink2)}
.modes button b{display:block;font-size:15px;color:var(--ink)}.modes button small{display:block;font-size:12.5px}
.modes button .mi{width:34px;height:34px;border-radius:10px;background:var(--bg);display:grid;place-items:center;flex:0 0 34px;color:var(--gd)}
.modes button.on{border-color:var(--g);background:var(--gl)}.modes button.on .mi{background:var(--g);color:#fff}
/* phone tracing */
.trw{display:grid;grid-template-columns:400px minmax(0,1fr);gap:22px;align-items:start}
.tph{height:auto;min-height:760px}
.trl{display:flex;gap:6px;overflow-x:auto;padding:10px 0 6px}.trl button{flex:0 0 44px;height:44px;border-radius:12px;border:1.5px solid var(--edge);background:#fff;font-size:20px;font-weight:700;font-family:'Noto Sans Bengali','Noto Sans',sans-serif}.trl button.on{background:var(--g);border-color:var(--g);color:#fff}
.tcan{position:relative;width:100%;aspect-ratio:1;background:#fff;border:1.5px solid var(--line);border-radius:18px;overflow:hidden;margin-top:6px}
.tcan canvas{position:absolute;inset:0;width:100%;height:100%}#ti{touch-action:none;cursor:crosshair}
.trres{margin-top:12px;background:#fff;border:1.5px solid #9FD9C1;border-radius:16px;padding:12px 14px;text-align:center}.trres.soft{border-color:var(--line);display:flex;flex-direction:column;gap:4px}
.trst{display:flex;justify-content:center;gap:4px;margin-bottom:6px}.trst .st path{fill:#FFF4D6;stroke:#7A5A06}.trst .st.on path{fill:#FFC93C}
/* ===== practice pack pages ===== */
.pp{--k:#0F7A66;--kd:#0B5C4D;--ks:#FFC93C;--kc:#F08A6B;--kl:#E3F5EC;--kt:#17302A;--k2:#4A615A;--kline:#DCE8E2;--kgd:#9FD9C1;padding:25.4mm 17.8mm 17.8mm 25.4mm}
.pp.bw{--k:#000;--kd:#000;--ks:#000;--kc:#000;--kl:#fff;--kt:#000;--k2:#222;--kline:#555;--kgd:#000}
.pp .ppin{flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden}
.pp .ppf{display:flex;align-items:center;gap:3mm;border-top:.6pt solid var(--kline);padding-top:2mm;margin-top:2mm;font-size:9pt;color:var(--k2)}
.pp .mk2{display:flex;align-items:center;gap:1.6mm;font-weight:700;color:var(--kd)}
.mk2.lite,.page .pf .mk2.lite{font-weight:400;font-size:8pt;color:#B8B8B8}.pp .mk2 svg,.pp .mk3 svg,.pp .cft svg{width:4mm;height:4mm}
.pp.bw .mk2 svg path,.pp.bw .mk3 svg path,.pp.bw .cft svg path{stroke:#000}.pp.bw .mk2 svg circle,.pp.bw .mk3 svg circle,.pp.bw .cft svg circle{fill:#fff;stroke:#000;stroke-width:3}
.pp .st path{fill:#fff;stroke:var(--k2);stroke-width:1.6}.pp .st.on path{fill:var(--ks);stroke:#7A5A06}.pp.bw .st.on path{fill:#000;stroke:#000}
.pp .lvb{display:inline-flex;align-items:center;gap:1mm;border-radius:99px;padding:.8mm 3mm;font-size:9.5pt;background:var(--kl);border:1pt solid var(--k);color:var(--kd);white-space:nowrap}.pp .lvb b{margin-left:1mm}
.pp.bw .lvb{border-width:1.2pt}.pp.bw .lvb.lv3{background:#000;color:#fff}.pp.bw .lvb.lv3 .st.on path{fill:#fff;stroke:#fff}.pp.bw .lvb.lv2{border-style:double;border-width:3pt}
.pp .qn{border-color:var(--k);color:var(--kd)}
.pp .ln{display:inline-block;border-bottom:.8pt solid var(--k2);height:1em;transform:translateY(2pt)}
.pp .wsh{display:flex;align-items:center;gap:6mm;font-size:10pt;color:var(--kt)}
.pp .wst{display:flex;gap:3mm;align-items:center;margin:3mm 0 3mm;padding:2.5mm 4mm;background:var(--kl);border-radius:3mm;border-left:2.2mm solid var(--k)}
.pp.bw .wst{border:1pt solid #000;border-left:2.2mm solid #000}
.pp .wst h3{font-size:14pt;font-weight:800;color:var(--kt);line-height:1.25}.pp .wst p{font-size:10.5pt;color:var(--k2)}
.pp .wsb{flex:1;min-height:0;display:flex;flex-direction:column}
.pp .i1{fill:#FFC93C}.pp .i2{fill:#5BBF8F}.pp .i3{fill:#F4A28A}.pp .i4{fill:#8FCBEA}.pp .i5{fill:#fff}.pp .is{stroke:#17302A;stroke-width:2;stroke-linejoin:round;stroke-linecap:round}.pp .dk{fill:#17302A}
.pp.bw .i1,.pp.bw .i3,.pp.bw .i4,.pp.bw .i5{fill:#fff}.pp.bw .i2{fill:#000}.pp.bw .is{stroke:#000;stroke-width:2.4}
.pp .sdot{fill:var(--k)}.sdot2{fill:#fff;stroke:var(--k);stroke-width:1.2}.pp .sarr{fill:none;stroke:var(--kd);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.pp .edot{fill:#fff;stroke:var(--kc);stroke-width:3}.pp .edot2{fill:var(--kc)}
.pp .dpath{fill:none;stroke:var(--kt);stroke-width:3;stroke-dasharray:7 7;stroke-linecap:round;opacity:.75}.pp .dpath2{display:none}
.pp .prow{flex:1;display:flex;flex-direction:column;justify-content:center;border-bottom:.6pt dashed var(--kline)}.pp .prow:last-child{border-bottom:0}
.pp .pn{font-size:9.5pt;font-weight:700;color:var(--k2)}.pp .psvg{width:100%;height:auto;max-height:44mm}
.pp .lgrid,.pp .ngrid,.pp .wgrid{flex:1;display:flex;flex-direction:column;justify-content:space-around}
.pp .lrow{display:grid;grid-template-columns:repeat(5,1fr);gap:2mm}.pp .gcell{width:100%;height:auto;border:.6pt solid var(--kline);border-radius:2mm;background:#fff}
.pp .gcell.box{border:1pt solid var(--k)}
.pp .gt{stroke:var(--kline);stroke-width:.6;stroke-dasharray:2 2}.pp .gh{stroke:var(--kgd);stroke-width:.9}.pp .gm{stroke:var(--kline);stroke-width:.6;stroke-dasharray:3 3}.pp .gb{stroke:var(--k);stroke-width:1}
.pp.bw .gh{stroke:#777}.pp.bw .gb{stroke:#000}
.pp text.g-model{fill:var(--kl);stroke:var(--kd);stroke-width:1.1}
.pp text.g-d1,.pp text.g-d2,.pp text.g-d3{fill:none;stroke:var(--kt);stroke-width:1.15;stroke-dasharray:2.6 2;stroke-linecap:round}
.pp text.g-d2{opacity:.6}.pp text.g-d3{opacity:.33}
.pp.bw text.g-model{fill:#fff;stroke:#000;stroke-width:1.5}.pp.bw text.g-d2{opacity:.65}.pp.bw text.g-d3{opacity:.4}
.pp .nrow{display:grid;grid-template-columns:repeat(3,1fr) 3mm repeat(3,1fr);gap:1.6mm}.pp .nsep{border-left:1pt dashed var(--kline)}
.pp .wrow{display:grid;grid-template-columns:16mm 1fr 1fr 1fr;gap:2mm;align-items:center}.pp .wcell{width:100%;height:auto;border:.6pt solid var(--kline);border-radius:2mm}
.pp .wico{display:grid;place-items:center}
/* cover */
.pp .cov{flex:1;display:flex;flex-direction:column;align-items:center;text-align:center;border:1.5pt solid var(--k);border-radius:6mm;padding:8mm;position:relative}
.pp.bw .cov{border:2pt solid #000;outline:.8pt solid #000;outline-offset:-3mm}
.pp .covtop{display:flex;align-items:center;gap:2mm;width:100%;font-weight:700;color:var(--kd);font-size:11pt}.pp .mk3{display:flex}
.pp .chip2{border:1pt solid var(--k2);border-radius:99px;padding:.3mm 3mm;font-size:9pt;color:var(--k2)}
.pp .covart{display:flex;gap:3mm;flex-wrap:nowrap;justify-content:center;margin:14mm 0 8mm;max-width:140mm}.pp .covart span{transform:rotate(var(--r));background:var(--kl);border-radius:50%;padding:3mm;display:grid}
.pp.bw .covart span{border:1pt solid #000}
.pp .covh{font-size:40pt;font-weight:800;color:var(--kt);line-height:1.15}.pp .covs{font-size:13pt;color:var(--k2);margin-top:2mm}
.pp .covlv{display:grid;grid-template-columns:repeat(3,1fr);gap:4mm;margin-top:12mm;width:100%}.pp .covlv div{display:flex;flex-direction:column;gap:2mm;align-items:center;font-size:10pt;color:var(--k2)}
.pp .covname{display:flex;gap:3mm;align-items:baseline;width:100%;margin-top:auto;font-size:12pt;font-weight:700}.pp .covname .ln{flex:1}
.pp .covleg{display:flex;gap:3mm;align-items:center;margin-top:6mm;font-size:9.5pt;color:var(--k2)}
/* guide */
.pp .gtop{display:flex;align-items:center;gap:3mm;border-bottom:1.2pt solid var(--k);padding-bottom:2mm;margin-bottom:3mm}.pp .gtop h2{font-size:17pt;font-weight:800;color:var(--kt)}.pp .kt{font-size:10pt;color:var(--k2)}
.pp .ggoal{font-size:10.5pt;margin-bottom:3mm}
.pp .glv{display:grid;grid-template-columns:repeat(3,1fr);gap:3mm;margin-bottom:3mm}.pp .glvi{border:1pt solid var(--kline);border-radius:3mm;padding:2.5mm;display:flex;flex-direction:column;gap:1.2mm;font-size:10pt}.pp .glvi small{font-size:9pt;color:var(--k2)}
.pp.bw .glvi{border-color:#000}
.pp .g2{display:grid;grid-template-columns:1fr 1fr;gap:3mm}
.pp .gsec{border:1pt solid var(--kline);border-radius:3mm;padding:2.5mm 3.5mm;margin-bottom:3mm}.pp.bw .gsec{border-color:#000}
.pp .gsec h4{display:flex;gap:2mm;align-items:center;font-size:11pt;font-weight:800;color:var(--kd);margin-bottom:1mm}
.pp .gsec ul{margin:0;padding-left:5mm;font-size:10pt;line-height:1.5}
.pp .plan{display:grid;grid-template-columns:1fr;gap:1.4mm}.pp .plan div{display:grid;grid-template-columns:7mm 1fr auto;gap:2mm;align-items:center;font-size:10pt}.pp .plan b{color:var(--kd);font-size:9.5pt}
/* tables */
.pp table{border-collapse:collapse;width:100%;font-size:10pt}.pp th{background:var(--kl);color:var(--kd);text-align:left;padding:2mm;border:.8pt solid var(--kline)}.pp td{border:.8pt solid var(--kline);padding:1.8mm 2mm}
.pp.bw th{background:#fff;border:1pt solid #000;border-bottom:2pt solid #000;color:#000}.pp.bw td{border-color:#000}
.pp .qhint{display:flex;gap:2mm;align-items:center;margin-top:4mm;font-size:10pt;background:var(--kl);border-radius:3mm;padding:3mm}.pp.bw .qhint{border:1pt dashed #000}
.pp .trk td{height:13mm}.pp .trk td:first-child{width:38mm;font-weight:700}.pp .trk td .st{margin-right:.6mm}
/* certificates */
.pp.k-cert{padding:8mm 12mm}.pp.k-cert .ppin{justify-content:space-between}
.pp .cert{height:84mm;border:1.5pt solid var(--k);border-radius:4mm;padding:2mm;background:#fff}
.pp .cin{height:100%;border:.8pt dashed var(--ks);border-radius:3mm;padding:4mm 6mm;display:flex;flex-direction:column}.pp.bw .cin{border-color:#000}
.pp .crow{display:flex;gap:4mm;align-items:center;flex:1}.pp .ctx{flex:1}.pp .ctx h3{font-size:22pt;font-weight:800;color:var(--kd)}.pp .ctx p{font-size:11pt;margin-top:2mm}.pp .csk{font-size:12pt}
.pp .cst{display:flex;flex-direction:column;gap:1mm}
.pp .cbot{display:flex;gap:6mm;align-items:center;font-size:10pt}.pp .cft{margin-left:auto;display:flex;gap:1.2mm;align-items:center;font-size:9pt;color:var(--k2)}
.pp .cut{position:relative;border-top:1pt dashed var(--k2);height:0;margin:3mm 0}.pp .cut .sc{position:absolute;left:-1mm;top:-3mm;width:6mm;height:6mm;background:#fff;fill:none;stroke:var(--kt);stroke-width:1.8}
/* fractions */
.pp .fgrid{flex:1;display:grid;grid-template-columns:1fr 1fr;gap:5mm;align-content:space-around}.pp .fitem{display:grid;grid-template-columns:7mm 1fr;gap:2mm;align-items:start;border:1pt solid var(--kline);border-radius:3mm;padding:3mm}
.pp .fpair{display:flex;flex-direction:column;gap:3mm}.pp .fpair.pie{flex-direction:row;justify-content:space-around}.pp .fpair>div{display:flex;align-items:center;gap:2mm}.pp .fpair.pie>div{flex-direction:column}
.pp .fbar{width:52mm;height:auto}.pp .fpie{width:22mm;height:auto}
.pp .fon{fill:var(--kgd);stroke:var(--kt);stroke-width:1.4}.pp .foff{fill:#fff;stroke:var(--kt);stroke-width:1.4}
.pp.bw .fon{fill:var(--hp)}.pp .hbg{fill:#fff}.pp .hl{stroke:#000;stroke-width:2.6}
.pp .fl{font-size:12pt}.pp .tb{display:inline-block;width:7mm;height:7mm;border:1.2pt solid var(--kt);border-radius:1.2mm;flex:0 0 7mm}
.pp .fr{margin:0 1mm}.pp .fr i:first-child{border-bottom-color:var(--kt)}
.pp .rule2{display:grid;grid-template-columns:1fr 1fr;gap:3mm;margin-bottom:4mm;font-size:10.5pt}.pp .rule2 div{background:var(--kl);border-radius:3mm;padding:3mm}.pp.bw .rule2 div{border:1pt solid #000}
.pp .cgrid{display:grid;grid-template-columns:1fr 1fr;gap:4mm 8mm;margin-bottom:4mm}.pp .citem{display:flex;align-items:center;gap:3mm;font-size:15pt;border-bottom:.6pt dashed var(--kline);padding:2mm 0}
.pp .cb{display:inline-block;width:10mm;height:10mm;border:1.4pt solid var(--kt);border-radius:2mm}
.pp .wp{display:grid;grid-template-columns:7mm 1fr;gap:2mm;font-size:11pt;margin-top:3mm}.pp .wl{display:block;border-bottom:.8pt solid var(--kline);height:8mm}
.pp .ans2{columns:2;column-gap:8mm;font-size:10pt}.pp .ans2 h4{margin:2mm 0 1mm;break-after:avoid}.pp .ans2 p{margin:0 0 1.2mm;break-inside:avoid}.pp .ans2 p span{color:var(--k2);font-size:9.5pt}

.pp.k-guide .ggoal{font-size:11.5pt}.pp.k-guide .glvi{font-size:11pt;padding:3.5mm}.pp.k-guide .gsec{padding:3.5mm 4.5mm;margin-bottom:4mm}.pp.k-guide .gsec h4{font-size:12.5pt;margin-bottom:2mm}.pp.k-guide .gsec ul{font-size:11pt;line-height:1.75}.pp.k-guide .plan div{font-size:11pt;padding:1mm 0}
.pp.k-guide .ppin{justify-content:space-between}.pp.k-quick td{padding:2.6mm 2mm}
.pp .cgrid .citem{font-size:18pt;padding:4mm 0}.pp .cgrid{gap:5mm 10mm}.pp .rule2{font-size:11.5pt}
.pp .fgrid{align-content:stretch}.pp .fitem{align-items:center}.pp .fbar{width:50mm}.pp .fpie{width:27mm}.pp .fitem{min-width:0;overflow:hidden}.pp .fl{font-size:14pt}.pp[data-pg=f2] .cgrid{flex:1;align-content:space-around}
.lvb{display:inline-flex;align-items:center;gap:2px;border-radius:99px;padding:1px 8px;font-size:12px;background:var(--gl);color:var(--gd);white-space:nowrap}.lvb b{margin-left:3px}.st path{fill:#fff;stroke:#7A5A06;stroke-width:1.6}.st.on path{fill:#FFC93C}
@media (max-width:1100px){.trw{grid-template-columns:minmax(0,1fr)}.trw .side-note{display:none}}
@media (max-width:860px){.modes{grid-template-columns:1fr 1fr;gap:8px}.modes button small{display:none}.modes button b{font-size:14px}.tph{border:0;border-radius:0;min-height:0;box-shadow:none}}