/* Kids worksheets: navy hero band, tangerine accent, rounded Nunito headings. Sheets are always black on white, sized in mm.
   Ad slots have reserved heights so nothing shifts while they load. */
:root{
  --bg:#f6f6fb; --surface:#ffffff; --ink:#18203a; --muted:#5d6480; --line:#e2e4ef; --soft:#eef0f8;
  --hero:#16296a; --hero2:#2a4fc0; --hero-ink:#f4f6ff;
  --accent:#f26b1d; --accent-ink:#ffffff; --cool:#2a5bd7; --sun:#ffc23d; --leaf:#4b9b5a;
  --adbg:#ecedf5; --page-w:1080px;
  --display:"Nunito","Inter",ui-sans-serif,system-ui,sans-serif;
  --body:"Inter",ui-sans-serif,system-ui,sans-serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0e1222; --surface:#171c33; --ink:#e9ecf8; --muted:#a3a9c6; --line:#2a3152; --soft:#20263f;
  --hero:#101a45; --hero2:#203c94; --accent:#ff8a45; --accent-ink:#0e1222; --cool:#7aa5ff; --sun:#ffcf5c; --adbg:#1a1f38; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0e1222; --surface:#171c33; --ink:#e9ecf8; --muted:#a3a9c6; --line:#2a3152; --soft:#20263f;
  --hero:#101a45; --hero2:#203c94; --accent:#ff8a45; --accent-ink:#0e1222; --cool:#7aa5ff; --sun:#ffcf5c; --adbg:#1a1f38; color-scheme:dark}
:root[data-width="wide"]{--page-w:1360px}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:16px/1.55 var(--body)}
a{color:var(--cool)}
h1,h2,h3{font-family:var(--display);letter-spacing:-.01em;line-height:1.2;font-weight:800}
.in{max-width:var(--page-w);margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
input:focus-visible,select:focus-visible,button:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* Masthead */
.mast{background:radial-gradient(120% 150% at 88% 0%,var(--hero2) 0%,var(--hero) 64%);color:var(--hero-ink);padding-block:12px 60px}
.bar{display:flex;align-items:center;justify-content:space-between;gap:12px}
.logo{font:900 21px/1 var(--display);color:inherit;text-decoration:none;display:flex;align-items:center;gap:9px;white-space:nowrap}
.logo svg{flex:none}
.tools{display:flex;align-items:center;gap:4px}
.tools nav{display:flex;gap:18px;font-size:14px;margin-right:10px}
.tools nav a{color:inherit;opacity:.78;text-decoration:none;white-space:nowrap}
.tools nav a:hover,.tools nav a[aria-current]{opacity:1}
.tb-ico{display:grid;place-items:center;width:34px;height:34px;border-radius:8px;border:1px solid transparent;background:transparent;color:inherit;opacity:.8;cursor:pointer}
.tb-ico:hover{opacity:1;border-color:rgba(255,255,255,.3)}
.tb-ico.on{opacity:1;border-color:rgba(255,255,255,.45)}
.mast h1{font-size:clamp(26px,4vw,40px);margin:8px 0 6px;text-wrap:balance}
.mast .lede{margin:0;opacity:.85;font-size:16px}
.mast .eyebrow{display:inline-flex;margin-top:24px;font:700 12px var(--body);letter-spacing:.08em;text-transform:uppercase;color:var(--sun)}
.badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;font-size:13px}
.badges span{background:rgba(255,255,255,.12);border-radius:20px;padding:4px 11px;white-space:nowrap}
@media (max-width:860px){.tools nav{display:none}}

main.in{display:grid;gap:20px;padding-block:0 48px;margin-top:-40px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px}
.guide h2{font-size:22px;margin:0 0 8px}
.guide h3{font-size:17px;margin:16px 0 4px}
.guide ul{padding-left:20px}
.guide li{margin:3px 0}
.page-txt h1{font-size:28px;margin:0 0 10px}
.small,.src{font-size:13px;color:var(--muted)}
.hint{color:var(--muted);font-size:13px;margin:0;min-height:1.2em}
.btn{font:700 15px var(--body);background:var(--accent);color:var(--accent-ink);border:0;border-radius:10px;padding:10px 18px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:8px;white-space:nowrap}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line);font-weight:600}
.btn.ghost:hover{border-color:var(--accent)}

/* Maker controls */
.maker{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:16px;box-shadow:0 18px 40px -30px rgba(22,41,106,.6);display:grid;gap:14px}
.ctl{display:grid;gap:12px}
.subj{display:flex;gap:6px;flex-wrap:wrap}
.subj button{font:800 15px var(--display);color:var(--muted);background:var(--soft);border:0;border-radius:10px;padding:8px 14px;cursor:pointer}
.subj button[aria-selected="true"]{background:var(--hero2);color:#fff}
.types{display:flex;gap:6px;flex-wrap:wrap}
.types button{font:600 13.5px var(--body);color:var(--ink);background:var(--bg);border:1.5px solid var(--line);border-radius:20px;padding:5px 12px;cursor:pointer;white-space:nowrap}
.types button:hover{border-color:var(--accent)}
.types button.on{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 13%,var(--surface))}
.row{display:flex;gap:10px 14px;flex-wrap:wrap;align-items:flex-end}
.row .grow{flex:1}
.xo{display:contents}
.fld{display:grid;gap:3px}
.fld[hidden],.chk[hidden]{display:none}
.fld>span{font:600 11px var(--body);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.seg{display:inline-flex;background:var(--soft);border-radius:10px;padding:3px;gap:2px}
.seg button{font:500 14px var(--body);color:var(--muted);background:transparent;border:0;border-radius:8px;padding:6px 11px;cursor:pointer;white-space:nowrap}
.seg button[aria-checked="true"]{background:var(--surface);color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.14)}
select,.fld input{font:15px var(--body);color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:9px;padding:7px 9px;min-width:0;height:36px}
.fld input{width:170px}
.chk{display:flex;gap:6px;align-items:center;font-size:14px;height:36px;cursor:pointer}
.chk input{width:17px;height:17px;accent-color:var(--accent)}
.preview{background:var(--soft);border-radius:12px;padding:14px 0;overflow:hidden}
#sheets{display:grid;gap:14px;justify-items:center}

/* Sheets: real millimetres, scaled on screen with zoom */
.page{width:210mm;height:297mm;padding:12mm;background:#fff;color:#111;display:flex;flex-direction:column;font-family:"Andika","Nunito",sans-serif;overflow:hidden;zoom:var(--z,1);box-shadow:0 1px 3px rgba(0,0,0,.12),0 10px 30px -12px rgba(0,0,0,.25);color-scheme:light}
.page.letter{width:215.9mm;height:279.4mm}
.sh{display:flex;justify-content:space-between;align-items:flex-start;gap:6mm;border-bottom:.4mm solid #222;padding-bottom:3mm}
.sh h2{font:900 19pt/1.1 "Nunito",sans-serif;margin:0;letter-spacing:0}
.sh p{margin:1.2mm 0 0;font-size:11.5pt;color:#333}
.sh-f{display:grid;gap:2.2mm;font-size:10pt;text-align:right;flex:none}
.sh-f span,.paperh span{white-space:nowrap}
.sh u,.paperh u{display:inline-block;width:46mm;border-bottom:.3mm solid #444;margin-left:1.5mm}
.sh u.s,.paperh u.s{width:24mm}
.paperh{border:0;justify-content:flex-start;gap:12mm;font-size:10.5pt;padding-bottom:1mm}
.sb{flex:1;display:flex;flex-direction:column;justify-content:space-evenly;margin-top:4mm;min-height:0}
.sf{display:flex;justify-content:space-between;font:9pt "Nunito",sans-serif;color:#888;padding-top:2mm}
.key .an{color:#d1361b;font-weight:700}

.probs{display:grid;flex:1;align-content:space-evenly;column-gap:6mm;font-variant-numeric:tabular-nums}
.p{display:flex;gap:2mm;align-items:baseline}
.p>i{font:normal .48em "Nunito",sans-serif;color:#9a9a9a;min-width:5mm}
.probs.v .p{align-items:flex-start;justify-content:center}
.eq{white-space:nowrap}
.eq .an{display:inline-block;min-width:13mm;border-bottom:.3mm solid #444;text-align:center}
.vt{display:inline-grid;text-align:right;min-width:16mm;line-height:1.25}
.vt b{float:left;font-weight:400;margin-right:2mm}
.vl{border-top:.45mm solid #111;min-height:1.3em;padding-top:.5mm}
.ld{display:inline-grid;justify-items:end;line-height:1.3}
.lq{min-height:1.3em;padding-right:.5mm}
.lr{display:inline-flex}
.lr b{font-weight:400;padding-right:1.2mm}
.lr span{border-top:.45mm solid #111;border-left:.45mm solid #111;border-top-left-radius:2.5mm 3mm;padding:0 .5mm 0 1.8mm}
.lds .p{padding-bottom:16mm}
.ldc{display:inline-flex;align-items:flex-start;line-height:1.3}
.ldn{padding:0 1.6mm 0 0;letter-spacing:.04em}
.ldr{display:inline-grid;border-left:.45mm solid #111;min-width:14mm}
.ldr b{font-weight:400;padding:0 2mm;border-bottom:.45mm solid #111}
.ldr span{padding:0 2mm;min-height:1.3em}
.ldd{white-space:nowrap;line-height:1.3}
.ldd span{display:inline-block;min-width:14mm;border-bottom:.3mm solid #999}
.bx{display:inline-block;width:13mm;height:1.3em;border:.35mm solid #555;border-radius:1.5mm;vertical-align:middle;text-align:center;line-height:1.25}
.bx.c{width:9mm}
.bx.big{width:22mm;height:15mm;font-size:22pt;line-height:15mm;flex:none}
.cnt,.clks,.frs{display:grid;flex:1;align-content:space-evenly;gap:4mm}
.ci,.fi{display:flex;align-items:center;gap:3mm;border:.3mm dashed #c9c9c9;border-radius:3mm;padding:2mm 3mm}
.ci>i,.ck>i,.fi>i,.ml>i,.sc>i{font:normal 9pt "Nunito",sans-serif;color:#9a9a9a}
.sho{fill:none;stroke:#222;stroke-width:.7;stroke-linejoin:round}
.shf{fill:#333;stroke:#222;stroke-width:.5;stroke-linejoin:round}
.ck{display:flex;flex-direction:column;align-items:center;gap:2mm;position:relative}
.ck>i{position:absolute;left:0;top:0}
.clk{width:100%;display:block}
.clk .cf{fill:#fff;stroke:#111;stroke-width:1}
.clk .tk{stroke:#9a9a9a;stroke-width:.3}
.clk .tk5{stroke:#111;stroke-width:.7}
.clk text{font:700 3.9px "Nunito",sans-serif;text-anchor:middle;fill:#111}
.clk .hh{stroke:#111;stroke-width:1.7;stroke-linecap:round}
.clk .mh{stroke:#111;stroke-width:1;stroke-linecap:round}
.key .clk .hh,.key .clk .mh{stroke:#d1361b}
.clk .cd{fill:#111}
.tline{display:inline-block;min-width:30mm;border-bottom:.3mm solid #444;text-align:center;font-size:15pt;min-height:1.3em}
.tm{font:800 16pt "Nunito",sans-serif}
.frb{width:100%;max-width:56mm;min-width:0;flex:1}
.frc{width:28mm;flex:none}
.fo{fill:#fff;stroke:#111;stroke-width:.4}
.fs{fill:#b9b9b9;stroke:#111;stroke-width:.4}
.fr{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;line-height:1.1;font-size:.9em}
.fr>span:first-child{border-bottom:.35mm solid #111;padding:0 .8mm}
.fra{margin-left:auto;font-size:18pt}
.fb{display:inline-block;width:9mm;height:7.5mm;border:.3mm solid #777;border-radius:1mm;margin:.6mm 0}
.frq .eq .an{min-width:22mm}
.seqs{display:flex;flex-direction:column;justify-content:space-evenly;flex:1}
.sq{display:flex;gap:2.5mm;align-items:center;flex-wrap:nowrap}
.sq .nv,.sq .bx{min-width:19mm;width:auto;height:1.45em;text-align:center;line-height:1.45em}
.abc .nv,.abc .bx{min-width:15mm}
.trs{display:flex;flex-direction:column;justify-content:space-evenly;flex:1}
.trow{width:100%;display:block}
.gl{stroke:#555;stroke-width:.3}
.gm{stroke:#9a9a9a;stroke-width:.25;stroke-dasharray:1.6 1.2}
.gb{stroke:#2a5bd7;stroke-width:.45}
.trow{font-family:"Andika","Nunito",sans-serif}
.ts{fill:#1a1a1a}
.td{fill:#e4e4e4;stroke:#8a8a8a;stroke-width:.28;stroke-dasharray:.8 .6}
.mls{display:grid;grid-template-columns:1fr 1fr;align-content:space-evenly;flex:1;gap:3mm 8mm}
.ml{display:flex;align-items:baseline;gap:1mm;letter-spacing:.06em}
.ml>i{margin-right:2mm;letter-spacing:0}
.lb{display:inline-block;width:.8em;border-bottom:.4mm solid #222;text-align:center;margin:0 .3mm;min-height:1.1em}
.bank{border:.3mm dashed #999;border-radius:3mm;padding:3mm 4mm;font-size:12pt;line-height:1.6;margin-top:4mm}
.bank b{font-family:"Nunito",sans-serif;margin-right:3mm}
.scr{display:grid;align-content:space-evenly;flex:1;gap:3mm}
.sc{display:flex;align-items:center;gap:4mm}
.tiles{display:flex;gap:1.2mm}
.tiles span{display:inline-grid;place-items:center;min-width:1.25em;height:1.35em;border:.3mm solid #888;border-radius:1.5mm;padding:0 .6mm}
.wline{flex:1;border-bottom:.3mm solid #444;min-height:1.3em;padding-left:2mm}
.wsw{display:flex;justify-content:center}
.wsg{border-collapse:collapse;border:.5mm solid #222;font-family:"Nunito",sans-serif;font-weight:700}
.wsg td{text-align:center;padding:0;line-height:1}
.wsg td.hit{background:#ffd9c9}
.wsl{display:flex;flex-wrap:wrap;gap:2mm 7mm;justify-content:center;font-size:13pt;margin-top:6mm}
.wsl span{border-bottom:.3mm dotted #888}
.mz{display:flex;flex-direction:column;align-items:center;gap:1mm}
.mzl{font:800 12pt "Nunito",sans-serif;align-self:flex-start;margin-left:4mm}
.mzl.end{align-self:flex-end;margin-right:4mm}
.mzw{fill:none;stroke:#111;stroke-linecap:square}
.mzp{fill:none;stroke:#e5533d;stroke-linejoin:round;stroke-linecap:round;opacity:.75}
.sdks{display:grid;grid-template-columns:1fr 1fr;place-items:center;flex:1;align-content:space-evenly;gap:6mm}
.sdks.one{grid-template-columns:1fr}
.sdk{border-collapse:collapse;border:.8mm solid #111;font-family:"Nunito",sans-serif;font-weight:700;table-layout:fixed}
.sdk td{border:.25mm solid #999;text-align:center;padding:0}
.sdk td.br{border-right:.8mm solid #111}
.sdk td.bb{border-bottom:.8mm solid #111}
.shp{display:flex;flex-direction:column;justify-content:space-evenly;flex:1}
.sr{display:flex;gap:2mm;justify-content:space-between}
.sbx{display:inline-grid;place-items:center}
.sbx svg{width:100%;height:100%}
.sbx.bl{border:.4mm dashed #777;border-radius:2mm}
.paper{width:100%;display:block}
.pl{stroke:#9db4dd;stroke-width:.3}
.pm{stroke:#e88;stroke-width:.3}
.pg{stroke:#bccde9;stroke-width:.2}
.pg5{stroke:#8ea7d4;stroke-width:.3}
.pd{fill:#8a8a8a}

/* CTA bands, browse chips */
.cta{display:flex;gap:16px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:linear-gradient(120deg,color-mix(in srgb,var(--sun) 18%,var(--surface)),var(--surface))}
.cta h2{margin:0 0 4px;font-size:21px}
.cta p{margin:0;color:var(--muted);max-width:640px;font-size:14.5px}
.browse{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
.browse a{display:block;background:var(--soft);border-radius:12px;padding:10px 13px;text-decoration:none;color:var(--ink)}
.browse a b{display:block;font:800 15.5px var(--display)}
.browse a span{font-size:13px;color:var(--muted)}
.browse a:hover{background:color-mix(in srgb,var(--accent) 13%,var(--soft))}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips a{background:var(--soft);border-radius:20px;padding:5px 12px;text-decoration:none;color:var(--ink);font-size:14px}
.chips a:hover{background:color-mix(in srgb,var(--accent) 15%,var(--soft))}
.ad{background:var(--adbg);border-radius:12px;display:grid;place-items:center;color:var(--muted);font-size:11px;letter-spacing:.08em;text-transform:uppercase}
.ad.leader{min-height:120px}
.disclaimer{font-size:13px;color:var(--muted);margin:0}
.guides{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:13.5px;align-items:baseline}
.guides b{font-family:var(--display);margin-right:4px}
.guides a{color:var(--muted)}
footer.site{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:14px}
footer.site a{color:var(--muted)}

@media (max-width:640px){
  .row{gap:8px 10px}
  .row .grow{display:none}
  .btn{padding:9px 14px}
  .preview{padding:8px 0}
}

/* Print: only the sheets */
@media print{
  html,body{background:#fff!important}
  .mast,main.in>*:not(.maker),.ctl{display:none!important}
  main.in{display:block;margin:0;padding:0;max-width:none}
  .maker{border:0;padding:0;box-shadow:none;background:none;display:block}
  .preview{background:none;padding:0;border-radius:0}
  #sheets{display:block}
  .page{zoom:1!important;box-shadow:none;margin:0;break-after:page;page-break-after:always}
  .page:last-child{break-after:auto;page-break-after:auto}
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
}

/* Language switch and plain chips */
.lngm{position:relative;margin-right:4px}
.lngm summary{list-style:none;cursor:pointer;font:700 12px var(--body);opacity:.85;border:1px solid rgba(255,255,255,.35);border-radius:7px;padding:4px 7px}
.lngm summary::-webkit-details-marker{display:none}
.lngm summary:hover,.lngm[open] summary{opacity:1;border-color:rgba(255,255,255,.7)}
.lngm>div{position:absolute;right:0;top:calc(100% + 6px);z-index:20;background:var(--surface);border:1px solid var(--line);border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.18);padding:6px;display:grid;min-width:170px}
.lngm>div a{color:var(--ink);text-decoration:none;font:500 14px var(--body);padding:7px 10px;border-radius:7px;white-space:nowrap}
.lngm>div a:hover{background:var(--soft)}
.lngm>div a[aria-current]{font-weight:700}
.chip{display:inline-block;background:var(--soft);border-radius:20px;padding:5px 12px;font-size:14px;margin:0 4px 6px 0}
.lt-g{stroke:#c9c9c9;stroke-width:.25}
.lt-d{fill:none;stroke:#8a8a8a;stroke-width:.7;stroke-dasharray:1.4 1.1;stroke-linecap:round;stroke-linejoin:round}
.lt-s{fill:none;stroke:#1a1a1a;stroke-width:.9;stroke-linecap:round;stroke-linejoin:round}
.lt-o{fill:#1f9d55}
.fld.wide input{width:min(330px,80vw)}
.tt{display:grid;grid-template-columns:repeat(auto-fill,minmax(118px,1fr));gap:10px;margin:6px 0 14px}
.tt div{display:grid;gap:2px;background:var(--soft);border-radius:10px;padding:8px 12px;font-size:14px;font-variant-numeric:tabular-nums}
.tt b{font:800 15px var(--display);margin-bottom:3px}
.sy{stroke:#c9c3e6;stroke-width:.18}
.sY{stroke:#8f86c9;stroke-width:.3}
.tz{fill:none;stroke:#c0392b;stroke-width:.35}
.tzd{stroke:#e2a49c;stroke-width:.2;stroke-dasharray:1 .8}
.tzs{fill:none;stroke:#d9d9d9;stroke-width:.2}
.hzs{fill:#1a1a1a}
.hzd{fill:#ececec;stroke:#9a9a9a;stroke-dasharray:18 14}
.hzg{fill:#bdbdbd}
.hzh{fill:#c0392b}
.hzp{font:600 5.2px "Andika","Nunito",sans-serif;fill:#1a1a1a}
.hzt{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif}
.hzt.hzd{fill:#e4e4e4;stroke:#8a8a8a;stroke-width:.25;stroke-dasharray:.8 .6}