[hidden]{display:none!important}
:root{--ink:#1f3324;--muted:#5e6f61;--bg:#f6fcef;--card:#fff;--line:#e3eedb;--brand:#2b8a3e;--brandDark:#1f6b2e;--leaf:#8bd346;--brand2:#ff8a5c;--sun:#ffc531;--mint:#26de81;--grape:#a55eea;--radius:18px;--shadow:0 6px 20px rgba(31,64,36,.09)}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Nunito","Baloo 2","Segoe UI",system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);line-height:1.5;font-size:16px}
a{color:var(--brand)}h1,h2,h3{font-family:"Baloo 2","Fredoka","Nunito",system-ui,sans-serif;line-height:1.15;margin:.2em 0 .4em}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}.narrow{max-width:460px;margin:40px auto}.narrow-wide{max-width:980px;padding-top:24px}
.muted{color:var(--muted)}.small{font-size:.88rem}.center{text-align:center}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4em;background:var(--brand);color:#fff;border:0;border-radius:999px;padding:.75em 1.4em;font-weight:800;text-decoration:none;cursor:pointer;font-size:1rem;font-family:inherit;box-shadow:0 4px 0 var(--brandDark);transition:transform .08s}
.btn:hover{transform:translateY(-1px)}.btn:active{transform:translateY(2px);box-shadow:0 2px 0 var(--brandDark)}
.btn-ghost{background:#fff;color:var(--brand);border:2px solid #d6e0fb;box-shadow:none}.btn-small{padding:.45em 1em;font-size:.9rem}.btn-block{display:flex;width:100%;margin:.5em 0}
.linkbtn{background:none;border:0;color:var(--muted);font:inherit;cursor:pointer;padding:0}.linkbtn.danger{color:#d6336c}form.inline{display:inline}
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:.5em;text-decoration:none;color:var(--ink);font-family:"Baloo 2","Fredoka",sans-serif;font-weight:800;font-size:1.45rem}
.logo{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--grape));color:#fff;font-size:1.1rem}
.nav{display:flex;align-items:center;gap:22px}.nav a{text-decoration:none;color:var(--ink);font-weight:700}.nav a.active{color:var(--brand)}.nav a.btn{color:#fff}
.navtoggle,.burger{display:none}
.tier-pill{display:inline-block;font-size:.7rem;font-weight:900;letter-spacing:.06em;padding:.15em .6em;border-radius:999px;background:#eef1f5;color:#556;vertical-align:middle}
.tier-pill.pro{background:#e0f7ec;color:#0a8a4b}.tier-pill.ultra{background:linear-gradient(90deg,#a55eea,#eb3b9a);color:#fff}.tier-pill.free{background:#eef1f5;color:#556}
.flash{margin:16px 0 0;background:#fff8db;border:1px solid #ffe08a;border-radius:12px;padding:.7em 1em;font-weight:700}
.error{background:#ffe3e8;border:1px solid #ffb3c1;color:#a61e4d;border-radius:12px;padding:.6em .9em;margin:.6em 0;font-weight:700}
/* hero */
.hero{background:radial-gradient(circle at 15% 20%,#ffe9a8 0,transparent 40%),radial-gradient(circle at 85% 10%,#d0e2ff 0,transparent 45%),radial-gradient(circle at 70% 90%,#ffd6e0 0,transparent 40%);padding:56px 0 40px}
.hero-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.eyebrow{display:inline-block;background:#fff;border:2px solid #ffe08a;border-radius:999px;padding:.2em .9em;font-weight:800;color:#b8860b;font-size:.9rem}
.hero h1{font-size:clamp(2rem,4.4vw,3.3rem);margin:.35em 0}.hl{background:linear-gradient(transparent 60%,#ffe08a 60%)}
.lead{font-size:1.15rem;color:#3d4b58}.cta{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0}
.ticks{list-style:none;padding:0;display:flex;gap:18px;flex-wrap:wrap;color:#3d4b58;font-weight:700;font-size:.95rem}
.hero-art{position:relative;height:420px}.paper{position:absolute;width:62%;border-radius:8px;box-shadow:0 18px 40px rgba(34,48,60,.18);background:#fff}
.p1{left:2%;top:10px;transform:rotate(-5deg)}.p2{right:2%;top:50px;transform:rotate(4deg)}
.section-title{font-size:2rem;margin:42px 0 16px;text-align:center}
.grade-grid{display:grid;grid-template-columns:repeat(9,1fr);gap:14px}
.grade-bubble{--c:var(--brand);display:flex;flex-direction:column;align-items:center;gap:2px;padding:18px 6px;border-radius:22px;background:#fff;border:3px solid var(--c);text-decoration:none;color:var(--ink);box-shadow:0 5px 0 var(--c);transition:transform .1s}
.grade-bubble:hover{transform:translateY(-3px)}.grade-bubble .g{display:grid;place-items:center;width:54px;height:54px;border-radius:50%;background:var(--c);color:#fff;font:800 1.6rem "Baloo 2",sans-serif}
.grade-bubble .n{font-weight:800;font-size:.9rem;text-align:center}.grade-bubble .c{font-size:.78rem;color:var(--muted)}
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:48px}
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}.ficon{font-size:2rem}
.chips{display:flex;flex-wrap:wrap;gap:8px}.topics .chips{justify-content:center}
.chip{--c:var(--brand);display:inline-block;padding:.4em .95em;border-radius:999px;background:#fff;border:2px solid #e4e8f0;text-decoration:none;color:var(--ink);font-weight:700;font-size:.92rem}
.chip:hover{border-color:var(--c)}.chip.on{background:var(--c);border-color:var(--c);color:#fff}.chip.kid.on{background:#ff9f43;border-color:#ff9f43}
.footer{margin-top:60px;padding:28px 0;border-top:1px solid var(--line);background:#fff;font-size:.95rem}.footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
/* forms */
.form-card h1{font-size:2rem}.form{display:flex;flex-direction:column;gap:14px;margin-top:10px}
.form label{display:flex;flex-direction:column;gap:6px;font-weight:800}.form label.check{flex-direction:row;align-items:flex-start;gap:10px;font-weight:600;font-size:.92rem}
input,select{font:inherit;padding:.7em .9em;border:2px solid #e1e5ec;border-radius:12px;background:#fff;color:var(--ink)}input:focus,select:focus{outline:none;border-color:var(--brand)}
.inline-form{flex-direction:row;flex-wrap:wrap;align-items:center;gap:8px}.inline-form input{flex:1;min-width:150px}
/* library */
.lib-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;flex-wrap:wrap;margin:28px 0 14px}.lib-head h1{font-size:2.3rem;margin:0}
.search{display:flex;gap:8px}.search input{width:280px}
.filters{display:flex;flex-direction:column;gap:12px;padding:16px 20px;margin-bottom:22px}.frow{display:flex;gap:14px;align-items:center}.flabel{min-width:56px;font-weight:900;color:var(--muted);font-size:.85rem;text-transform:uppercase;letter-spacing:.05em}
.ws-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:20px}
.ws-card{--c:var(--brand);background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;border-top:6px solid var(--c)}
.thumb{display:block;background:#f6f3ec;height:170px;overflow:hidden;border-bottom:1px solid var(--line)}.thumb img{width:100%;display:block;object-fit:cover;object-position:top}
.ws-body{padding:14px 16px 16px;display:flex;flex-direction:column;flex:1}.ws-body h3{font-size:1.2rem;margin:.35em 0 .1em}.ws-body h3 a{color:var(--ink);text-decoration:none}
.ws-meta{display:flex;gap:6px;flex-wrap:wrap}.gpill,.tpill{font-size:.72rem;font-weight:900;border-radius:999px;padding:.2em .7em}.gpill{background:var(--c,var(--brand));color:#fff}.tpill{background:#f1f3f7;color:#556}
.dl{display:flex;align-items:center;gap:5px;margin:6px 0;flex-wrap:wrap}.dl-label{font-size:.72rem;font-weight:900;color:var(--muted);width:100%;text-transform:uppercase;letter-spacing:.04em}
.vbtn{display:inline-grid;place-items:center;min-width:33px;height:30px;flex:1;border-radius:9px;border:2px solid var(--c);color:var(--ink);font-weight:800;font-size:.82rem;text-decoration:none;background:#fff}
.vbtn:hover{background:var(--c);color:#fff}.vbtn.key{border-color:#ffb3c1;color:#c2255c}.vbtn.key:hover{background:#d6336c;color:#fff}
.zip{margin-top:auto;padding-top:.55em}.empty{grid-column:1/-1;text-align:center}
/* worksheet page */
.ws-page{display:grid;grid-template-columns:1fr 340px;gap:24px;margin-top:14px}.tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.tab{padding:.35em .8em;border-radius:10px;background:#f1f3f7;text-decoration:none;color:var(--ink);font-weight:800;font-size:.88rem}.tab.on{background:var(--brand);color:#fff}.tab.key.on{background:#d6336c}
.page-img{width:100%;border:1px solid var(--line);border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.08);background:#fff}.ws-side .card{position:sticky;top:86px}.ws-title{font-size:1.8rem}
/* account */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px}.kids{list-style:none;padding:0}.kids li{display:flex;justify-content:space-between;padding:.55em 0;border-bottom:1px dashed var(--line)}
.demo-note{background:#f3f0ff;border:1px dashed #b197fc;border-radius:12px;padding:.6em .8em;font-size:.9rem;margin:10px 0}
.tiers{display:flex;flex-direction:column;gap:10px}.tier-opt{display:flex;flex-direction:column;align-items:flex-start;text-align:left;font:inherit;padding:12px 14px;border:2px solid #e4e8f0;border-radius:14px;background:#fff;cursor:pointer;position:relative}
.tier-opt span{color:var(--muted);font-size:.9rem}.tier-opt.on{border-color:var(--brand);background:#f3f7ff}.tier-opt.ultra.on{border-color:#a55eea;background:#faf3ff}.tier-opt em{position:absolute;right:12px;top:12px;font-style:normal;font-weight:900;font-size:.75rem;color:var(--brand)}
/* ad slot placeholders (empty: no ad network) */
.ad-slot{border:2px dashed #cfd6e0;border-radius:14px;background:repeating-linear-gradient(45deg,#fafbfc,#fafbfc 10px,#f3f5f8 10px,#f3f5f8 20px);display:grid;place-items:center;min-height:90px;margin:20px auto;max-width:1180px;color:#99a3ae;font-weight:800;letter-spacing:.08em;text-transform:uppercase;font-size:.8rem}
/* help */
.help-wrap{max-width:860px}.help-head{text-align:center;margin-top:30px}.help-head h1{font-size:2.4rem}
.help-box{padding:20px}.help-input{display:flex;gap:10px}.help-input input{flex:1;font-size:2rem;font-weight:800;padding:.35em .6em;border-radius:16px;font-family:"Baloo 2",sans-serif}
.qbtn{width:76px;border:0;border-radius:16px;background:linear-gradient(135deg,var(--sun),#ff9f43);color:#fff;font:900 2.2rem "Baloo 2",sans-serif;cursor:pointer;box-shadow:0 5px 0 #d9822b}
.qbtn:active{transform:translateY(3px);box-shadow:0 2px 0 #d9822b}.help-row{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-top:12px}.help-row select{padding:.3em .5em}
kbd{background:#fff;border:2px solid #dde2ea;border-bottom-width:4px;border-radius:8px;padding:0 .45em;font-weight:900}
.answer-banner{margin:22px 0 10px;text-align:center;font:800 2.2rem "Baloo 2",sans-serif}.answer-banner .eqn{background:#fff;border:3px solid var(--sun);border-radius:20px;padding:.1em .6em;display:inline-block}
.stack{display:flex;flex-direction:column;gap:16px;margin-top:10px}
.xcard{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:18px 20px;border-left:8px solid var(--c,var(--brand));opacity:0;transform:translateY(12px);animation:rise .45s ease forwards}
@keyframes rise{to{opacity:1;transform:none}}
.xhead{display:flex;align-items:center;gap:10px;justify-content:space-between}.xtitle{display:flex;align-items:center;gap:10px;font:800 1.3rem "Baloo 2",sans-serif}.xicon{font-size:1.6rem}
.xnum{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--c,var(--brand));color:#fff;font-size:.9rem;font-weight:900}
.thumb-btn{border:2px solid #e4e8f0;background:#fff;border-radius:999px;padding:.3em .8em;font:inherit;font-weight:800;cursor:pointer}.thumb-btn.done{background:#e0f7ec;border-color:#26de81;color:#0a8a4b}
.xtext{font-size:1.08rem;margin:.6em 0}.viz{margin:.6em 0;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.blk{width:26px;height:26px;border-radius:6px;display:inline-block;box-shadow:inset 0 -3px 0 rgba(0,0,0,.15)}.blk.a{background:#ff6b6b}.blk.b{background:#45aaf2}.blk.x{background:#dfe4ea;position:relative}.blk.x:after{content:"\2715";position:absolute;inset:0;display:grid;place-items:center;color:#d6336c;font-weight:900}
.plus{font:900 1.6rem "Baloo 2",sans-serif;margin:0 6px}.row{display:flex;gap:4px;margin:2px 0}.grp{display:inline-flex;flex-wrap:wrap;gap:4px;padding:6px;border:2px dashed #cfd6e0;border-radius:12px;max-width:180px}
.apple{font-size:1.7rem;line-height:1}.nl svg{width:100%;height:auto}.listen{border:0;border-radius:999px;background:var(--brand);color:#fff;font:inherit;font-weight:800;padding:.5em 1.1em;cursor:pointer}
.hand{font-size:2rem}.fingers{display:flex;gap:16px;align-items:center}.circ{width:30px;height:30px;border-radius:50%;border:3px solid #a55eea;display:inline-block;position:relative}.circ.b{border-color:#26de81}.circ.x:after{content:"";position:absolute;left:-4px;right:-4px;top:50%;border-top:3px solid #d6336c;transform:rotate(-35deg)}
.seq{display:flex;flex-wrap:wrap;gap:6px}.seq span{background:#f1f3f7;border-radius:10px;padding:.2em .6em;font-weight:900;font-size:1.1rem}.seq span.start{background:#ffe08a}.seq span.end{background:#26de81;color:#fff}
.xcard.ad{border-left-color:#cfd6e0;padding:0;box-shadow:none;border:2px dashed #cfd6e0;background:repeating-linear-gradient(45deg,#fafbfc,#fafbfc 10px,#f3f5f8 10px,#f3f5f8 20px)}.xcard.ad div{display:grid;place-items:center;min-height:120px;color:#99a3ae;font-weight:900;letter-spacing:.1em;text-transform:uppercase}
.xcard.upgrade{border-left-color:#a55eea;background:linear-gradient(135deg,#faf3ff,#fff4f9)}.up-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}.up-opt{border:2px solid #e9d8fd;border-radius:14px;padding:12px;background:#fff}.up-opt b{font-size:1.1rem}
.msg{margin-top:18px;text-align:center}
/* responsive */
@media (max-width:980px){.hero-inner{grid-template-columns:1fr}.hero-art{height:340px}.grade-grid{grid-template-columns:repeat(5,1fr)}.features{grid-template-columns:1fr 1fr}.ws-page{grid-template-columns:1fr}.ws-side .card{position:static}.grid2{grid-template-columns:1fr}}
@media (max-width:640px){body{font-size:15px}.burger{display:block;font-size:1.6rem;cursor:pointer;padding:6px}.nav{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:12px 20px;gap:12px;border-bottom:1px solid var(--line)}
.navtoggle:checked~.nav{display:flex}.grade-grid{grid-template-columns:repeat(3,1fr)}.features{grid-template-columns:1fr}.hero{padding-top:30px}.hero-art{height:260px}.search,.search input{width:100%}.frow{flex-direction:column;align-items:flex-start;gap:6px}
.help-input input{font-size:1.6rem}.answer-banner{font-size:1.7rem}.up-grid{grid-template-columns:1fr}.xtitle{font-size:1.1rem}.lib-head h1{font-size:1.9rem}}

.help-split{display:grid;grid-template-columns:360px 1fr;gap:26px;align-items:start;max-width:1180px}
.help-left{position:sticky;top:86px}.help-left h1{font-size:2.1rem;margin-top:24px}.help-right{min-height:60vh}
.help-input{flex-direction:column}.help-input input{font-size:2.4rem;text-align:center}.qbtn{width:100%;height:84px;font-size:3rem}
.alt-in{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}.alt-in button{font:inherit;font-weight:800;font-size:.85rem;padding:.6em;border-radius:12px;border:2px dashed #d5dbe5;background:#fafbfc;color:#8a94a6;cursor:not-allowed}
.empty-right{display:grid;place-items:center;min-height:420px;border:3px dashed #e6e1d6;border-radius:24px;color:#a19a8c;text-align:center;font-weight:800;padding:20px}
.empty-right .big{font:900 5rem "Baloo 2",sans-serif;color:#f7b731;line-height:1}
.fb{display:flex;gap:8px;flex-wrap:wrap}.confused-btn{border:2px solid #e4e8f0;background:#fff;border-radius:999px;padding:.3em .8em;font:inherit;font-weight:800;cursor:pointer;color:#6b7785}
.confused-btn.done{background:#fff4e6;border-color:#ffa94d;color:#d9480f}
@media (max-width:900px){.help-split{grid-template-columns:1fr}.help-left{position:static}.help-left h1{text-align:center}.empty-right{min-height:160px}.empty-right .big{font-size:3rem}.qbtn{height:64px}.help-input input{font-size:2rem}}
.photo-btn{display:block;text-align:center;font-weight:800;font-size:.85rem;padding:.6em;border-radius:12px;border:2px solid #d6e0fb;background:#f3f7ff;color:var(--brand);cursor:pointer}
.saved-note{background:#e6fcf5;border:1px solid #96f2d7;border-radius:14px;padding:.7em 1em;margin-bottom:14px;font-weight:700;display:flex;gap:12px;align-items:center}.saved-note img{width:56px;height:56px;object-fit:cover;border-radius:10px}
.help-split>*,.ws-page>*,.grid2>*,.hero-inner>*{min-width:0}
.xhead{flex-wrap:wrap;row-gap:8px}.viz svg{max-width:100%}
html,body{overflow-x:clip}
@media (max-width:640px){.help-split{padding:0 14px}.fb button{font-size:.8rem;padding:.25em .6em}.grp{max-width:100%!important}}
.watch{background:#0f172a;border-radius:14px;padding:14px 16px;margin:.6em 0;color:#e2e8f0;min-height:150px}.wsteps{display:flex;flex-direction:column;gap:6px;margin-bottom:10px}
.wstep{font:700 1.05rem "Nunito",sans-serif;padding:.25em .6em;border-left:4px solid #45aaf2;animation:rise .4s ease forwards;opacity:0}.wstep.key{border-color:#f7b731;background:rgba(247,183,49,.15);font-size:1.3rem}

/* ===== Mobile-first pass ===== */
.vh{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;opacity:0}
.btn-big{font-size:1.12rem;padding:.85em 1.5em;min-height:54px}
.top-me,.top-signup{display:none}
.tabbar{display:none}
/* Help: photo-first */
.help-sub{margin-top:-.2em}
.snap-btn{display:flex;align-items:center;gap:14px;width:100%;min-height:92px;padding:14px 20px;border-radius:22px;background:linear-gradient(135deg,var(--brand),#a55eea);color:#fff;cursor:pointer;box-shadow:0 6px 0 #3a4fb8,0 10px 24px rgba(75,123,236,.3);position:relative;-webkit-tap-highlight-color:transparent;user-select:none}
.snap-btn:active{transform:translateY(3px);box-shadow:0 3px 0 #3a4fb8}
.snap-btn:focus-within{outline:3px solid #ffe08a;outline-offset:3px}
.snap-ic{font-size:2.6rem;line-height:1;display:grid;place-items:center;width:64px;height:64px;border-radius:50%;background:rgba(255,255,255,.18)}
.snap-tx{display:flex;flex-direction:column;text-align:left}.snap-tx b{font:800 1.55rem "Baloo 2",sans-serif;line-height:1.1}.snap-tx small{opacity:.9;font-size:.95rem;font-weight:700}
.snap-btn.pulse{animation:snapPulse 1.4s ease-in-out 3}
@keyframes snapPulse{50%{box-shadow:0 6px 0 #3a4fb8,0 0 0 10px rgba(165,94,234,.25)}}
.gallery-link{display:flex;align-items:center;justify-content:center;gap:8px;min-height:48px;margin-top:10px;border-radius:14px;border:2px solid #d6e0fb;background:#f3f7ff;color:var(--brand);font-weight:800;cursor:pointer;position:relative}
.or{display:flex;align-items:center;gap:10px;margin:16px 0 12px;color:var(--muted);font-weight:800;font-size:.9rem}.or:before,.or:after{content:"";flex:1;border-top:2px dashed #e4e8f0}
.help-input{flex-direction:row!important;gap:10px}.help-input input{min-width:0;font-size:2rem!important;text-align:center;padding:.3em .4em}
.qbtn{width:84px!important;height:auto!important;min-height:64px;flex:0 0 auto;font-size:2.4rem!important}
.kbd-hint{margin:.5em 0 0;text-align:center}
.try-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:12px}
.try{min-height:44px;min-width:56px;padding:0 .8em;border-radius:12px;border:2px solid #e4e8f0;background:#fff;font:inherit;font-weight:800;color:var(--ink);cursor:pointer}
.try:active{background:#f3f7ff;border-color:var(--brand)}
.help-row select{min-height:44px}.learner-l{display:flex;align-items:center;gap:8px}
.tier-pill{font-size:.78rem}
.empty-right{min-height:260px}.how-mini{text-align:left;margin:0;padding-left:1.3em;font-size:1.1rem;line-height:2.1;color:#6b6457}
/* try-first */
.tryfirst{text-align:center;padding:18px 18px 12px;border:3px solid var(--sun);margin-bottom:14px}
.tf-label{margin:0 0 6px;font-weight:900;color:#b8860b}
.tf-row{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap}
.tf-row .eqn{font:800 2.2rem "Baloo 2",sans-serif}
.tf-row input{width:110px;font:800 2rem "Baloo 2",sans-serif;text-align:center;padding:.15em .3em;min-height:56px}
.tf-row .btn{min-height:56px}
.tf-msg{min-height:1.5em;margin:10px 0 4px;font-weight:800}.tf-msg.ok{color:#0a8a4b}.tf-msg.no{color:#d9480f}
.tryfirst.solved{border-color:var(--mint);background:#f0fff7}
#showHow{min-height:50px;margin-top:8px}
.snap-card{display:flex;gap:14px;align-items:flex-start;padding:14px;margin-bottom:14px}.snap-card img{width:96px;height:96px;object-fit:cover;border-radius:14px;flex:0 0 auto;background:#f1f3f7}
.sc-body{flex:1;min-width:0}.sc-body p{margin:.3em 0}
.photo-q{display:flex;gap:8px;margin-top:6px}.photo-q input{flex:1;min-width:0;font:800 1.5rem "Baloo 2",sans-serif;text-align:center;min-height:52px}.qbtn.small-q{width:60px!important;min-height:52px;font-size:1.8rem!important}
/* homepage */
.hero-snap .hero-text h1{font-size:clamp(2.1rem,5vw,3.4rem)}
.beta-note{margin:-6px 0 10px}
.phone-art{display:grid;place-items:center;height:auto!important}
.phone{width:270px;border-radius:38px;background:#fff;border:10px solid #22303c;box-shadow:0 24px 50px rgba(34,48,60,.22);padding:12px;display:flex;flex-direction:column;gap:8px;transform:rotate(3deg)}
.ph-cam{position:relative;height:190px;border-radius:20px;overflow:hidden;background:#222}.ph-cam img{width:180%;margin:-6% 0 0 -6%;opacity:.92}
.ph-frame{position:absolute;inset:22% 14%;border:3px solid #ffe08a;border-radius:14px;box-shadow:0 0 0 999px rgba(0,0,0,.25)}
.ph-shutter{position:absolute;bottom:10px;left:50%;width:44px;height:44px;margin-left:-22px;border-radius:50%;background:#fff;border:4px solid rgba(255,255,255,.5);background-clip:padding-box}
.ph-try{text-align:center;font:800 1.5rem "Baloo 2",sans-serif;border:3px solid var(--sun);border-radius:16px;padding:2px 0}.ph-q{color:#b8860b}
.ph-card{border-left:6px solid var(--c);border-radius:12px;background:#fafbfc;padding:8px 10px;font-weight:800;font-size:.95rem}.ph-card b{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:var(--c);color:#fff;font-size:.75rem;margin-right:4px}
.how-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.how-step{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}.how-step .hn{position:absolute;top:14px;right:16px;font:900 2.2rem "Baloo 2",sans-serif;color:#eef1f5}
.free-hook{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center;margin-top:56px;background:linear-gradient(135deg,#fff8db,#fff);border:1px solid var(--line);border-radius:28px;padding:30px}
.free-hook h2{font-size:2rem}.fh-art{position:relative;height:340px}
.th-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.th{background:#fff;border:2px solid #e4e8f0;border-radius:18px;padding:18px}.th b{font:800 1.4rem "Baloo 2",sans-serif}.th.pro{border-color:#8ce99a}.th.ultra{border-color:#d0bfff;background:#faf5ff}
.at-card{display:flex;align-items:center;gap:18px;margin-top:40px}.at-card>div{flex:1}.at-card h3{margin:0}.at-card img{border-radius:18px}
/* account */
.acct-actions{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}
/* /app page */
.app-page{max-width:1000px;padding-top:24px}.app-hero{display:flex;gap:20px;align-items:center}.app-hero h1{font-size:2.4rem;margin:0}.app-icon{border-radius:22px;box-shadow:var(--shadow)}
.install-now{margin:20px 0;border:3px solid #d6e0fb;background:linear-gradient(135deg,#f3f7ff,#fff)}
.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:18px}.os-card h2,.qr-card h2{font-size:1.4rem}
.steps{padding-left:1.3em;line-height:1.6}.steps li{margin:.35em 0}.share-ic{display:inline-grid;place-items:center;width:1.6em;height:1.6em;border:2px solid currentColor;border-radius:6px;font-size:.8em;vertical-align:middle}
.badge-soon{display:inline-flex;align-items:center;gap:10px;background:#22303c;color:#fff;border-radius:12px;padding:8px 16px;opacity:.55;cursor:not-allowed;margin-top:8px}.badge-soon small{display:block;font-size:.7rem;opacity:.85}.badge-soon b{font-size:1.15rem;line-height:1}.badge-soon .b-ic{font-size:1.5rem}
.badge-soon span{display:block}
.qr-card{text-align:center}.qr{width:220px;height:220px;border-radius:12px;border:1px solid var(--line);background:#fff}.qr-url{word-break:break-all}
/* install banner */
.install-bar{position:fixed;left:12px;right:12px;bottom:calc(12px + env(safe-area-inset-bottom));z-index:30;display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 10px 30px rgba(34,48,60,.2);padding:10px 12px;max-width:560px;margin:0 auto}
.install-bar[hidden]{display:none}.ib-icon img{border-radius:10px;display:block}.ib-text{flex:1;font-size:.95rem;line-height:1.3}.ib-close{border:0;background:none;font-size:1.1rem;color:var(--muted);min-width:44px;min-height:44px;cursor:pointer}
html.standalone .install-bar{display:none!important}
/* bigger tap targets on touch screens */
@media (pointer:coarse){
  .chip{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:44px}
  .vbtn{height:44px;font-size:.95rem}
  .tab{display:inline-flex;align-items:center;min-height:44px}
  .thumb-btn,.confused-btn{min-height:44px;font-size:.95rem!important}
  .listen{min-height:44px}
  .btn-small{min-height:44px}
  select,input:not([type=checkbox]):not([type=radio]){min-height:44px}
  .nav a,.nav .linkbtn{display:inline-flex;align-items:center;min-height:44px}
  .kids a,.kids .linkbtn{display:inline-flex;align-items:center;min-height:44px;padding:0 6px}
  .kbd-hint{display:none}
  .form label.check input{width:24px;height:24px;flex:0 0 auto}
  .gpill,.tpill{font-size:.8rem}.dl-label{font-size:.8rem}
}
/* phones + tablets in portrait: app-like shell with a bottom tab bar */
@media (max-width:820px){
  .topbar{position:static}.topbar-inner{height:56px}.brand{font-size:1.25rem}.logo{width:34px;height:34px}
  .nav,.burger,.navtoggle{display:none!important}
  .top-me{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;font-size:1.3rem;text-decoration:none}
  .top-signup{display:inline-flex}
  body{padding-bottom:calc(78px + env(safe-area-inset-bottom))}
  .tabbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:40;background:rgba(255,255,255,.97);backdrop-filter:blur(8px);border-top:1px solid var(--line);padding:6px 6px calc(6px + env(safe-area-inset-bottom));justify-content:space-around;align-items:flex-end}
  .tab-i,.tab-snap{display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:2px;min-width:60px;min-height:56px;text-decoration:none;color:#6b7785;font-weight:800;font-size:.75rem;-webkit-tap-highlight-color:transparent}
  .tab-i .ti{font-size:1.45rem;line-height:1}.tab-i.active,.tab-snap.active{color:var(--brand)}
  .snap-ring{display:grid;place-items:center;width:62px;height:62px;margin-top:-26px;border-radius:50%;background:linear-gradient(135deg,var(--brand),#a55eea);color:#fff;font-size:1.8rem;box-shadow:0 6px 16px rgba(75,123,236,.45);border:4px solid #fff}
  .install-bar{bottom:calc(86px + env(safe-area-inset-bottom))}
  .footer{margin-top:30px}
  .help-left h1{margin-top:14px;font-size:1.9rem}
  .hero-inner{grid-template-columns:1fr}.phone{transform:none;width:250px}
  .how-grid,.th-grid,.app-grid{grid-template-columns:1fr}.free-hook{grid-template-columns:1fr;padding:22px}.fh-art{height:260px}
}
@media (max-width:640px){
  .hero{padding:22px 0 26px}.hero-snap .hero-text h1{font-size:2.15rem}.lead{font-size:1.05rem}
  .cta .btn{flex:1 1 100%}
  .phone-art{display:none!important}
  .chips.scroll-row{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;margin:0 -14px;padding:2px 14px 6px;scroll-padding:0 14px;scroll-snap-type:x proximity;width:calc(100% + 28px)}
  .chips.scroll-row::-webkit-scrollbar{display:none}.chips.scroll-row .chip{flex:0 0 auto;scroll-snap-align:start}
  .filters{padding:12px 14px}.frow{width:100%}
  .lib-head{margin:18px 0 10px}
  .snap-btn{min-height:96px}.snap-tx b{font-size:1.6rem}
  .tf-row .eqn{font-size:1.9rem}
  .app-hero{flex-direction:column;text-align:center}.app-hero h1{font-size:2rem}
  .at-card{flex-direction:column;text-align:center}
  .section-title{font-size:1.7rem;margin:32px 0 14px}
  .help-split{padding:0 14px}
}

/* ===== Belts: earned Ultra (mobile-first) ===== */
a.tier-pill{text-decoration:none}
.belt-page,.rewards-page{padding-top:16px;padding-bottom:24px}
.learner-tabs{display:flex;gap:8px;overflow-x:auto;padding:2px 2px 10px;margin:0 -2px;scrollbar-width:none}
.learner-tabs .lt{flex:none;min-height:44px;display:inline-flex;align-items:center;padding:0 16px;border-radius:999px;background:#fff;border:2px solid #e1e5ec;text-decoration:none;color:var(--ink);font-weight:800}
.learner-tabs .lt.on{background:var(--brand);border-color:var(--brand);color:#fff}
.belt-gate{background:#f3f0ff;border-color:#d0bfff;margin-bottom:14px}.belt-gate p{margin:.3em 0 .7em}
.belt-hero{position:relative;overflow:hidden;background:linear-gradient(160deg,#fff 55%,color-mix(in srgb,var(--belt) 22%,#fff));margin-bottom:14px}
.belt-hero.theme-sunshine{background:linear-gradient(160deg,#fff9db,#ffe066)}.belt-hero.theme-jungle{background:linear-gradient(160deg,#ebfbee,#8ce99a)}
.belt-hero.theme-galaxy{background:linear-gradient(160deg,#2b2d6e,#5f3dc4);color:#fff}.belt-hero.theme-galaxy .bh-who,.belt-hero.theme-galaxy .bh-next{color:#e5dbff}
.bh-top{display:flex;align-items:center;gap:14px}.belt-svg{flex:none;filter:drop-shadow(0 3px 2px rgba(0,0,0,.12))}
.bh-avatar{position:absolute;right:14px;top:10px;font-size:2.2rem}
.bh-who{margin:0;font-weight:800;color:var(--muted)}.bh-name{margin:0;font-size:1.9rem}.bh-sub{margin:.2em 0 0}
.bh-prog{margin-top:14px}.bar{height:18px;border-radius:999px;background:#eef1f5;overflow:hidden;border:2px solid rgba(0,0,0,.06)}
.bar span{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--belt),var(--next));min-width:12px;transition:width .6s}
.bh-next{margin:.5em 0 0}
.bh-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px}.bh-stats div{background:rgba(255,255,255,.75);border-radius:14px;padding:8px;text-align:center;color:var(--ink)}
.bh-stats b{display:block;font-size:1.3rem}.bh-stats span{font-size:.8rem;font-weight:700}
.belt-grid{display:grid;gap:14px}.belt-grid h2{font-size:1.35rem}
.perk-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.perk{display:flex;flex-direction:column;gap:3px;padding:12px;border-radius:14px;background:#f8f6ff;border:1px solid #e5dbff}.perk .pi{font-size:1.6rem}.perk.paused{opacity:.6;filter:grayscale(.6)}.perk .btn{margin-top:auto;align-self:flex-start}
.earn{list-style:none;padding:0;margin:0}.earn li{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;padding:9px 0;border-bottom:1px dashed var(--line)}
.earn .ep{font-weight:900;color:#0a8a4b;background:#e0f7ec;border-radius:10px;padding:.15em .5em;font-size:.9rem;white-space:nowrap}.earn .cap{font-size:.8rem;font-weight:800;color:var(--muted);white-space:nowrap}.earn .cap.full{color:#d6336c}
.earn-cta{display:flex;flex-wrap:wrap;gap:8px}
.ladder{list-style:none;padding:0;margin:0}.ladder li{display:flex;gap:10px;align-items:center;padding:8px 0;border-bottom:1px dashed var(--line)}.ladder li.cur{background:#f3f0ff;border-radius:12px;padding-left:8px}
.ladder .lb{flex:none;width:44px;height:14px;border-radius:6px;background:var(--c);border:1px solid rgba(0,0,0,.2)}.ladder .ln{flex:1}.ladder li:not(.got) .lb{opacity:.45}.lt-ok{color:#0a8a4b;font-weight:900;font-size:1.2rem}
.badges{display:flex;flex-wrap:wrap;gap:8px}.badge{background:#fff4e6;border:1px solid #ffd8a8;border-radius:999px;padding:.3em .8em;font-weight:700;font-size:.9rem}
.cos-row{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0}.cos{min-height:44px;min-width:44px;border-radius:12px;border:2px solid #e1e5ec;background:#fff;font:inherit;font-weight:800;cursor:pointer;padding:0 12px;font-size:1rem}.cos.on{border-color:var(--brand);background:#eef3ff}
.demo-grant{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.demo-grant select{flex:1;min-width:160px}
.ultra-earned{margin-top:14px;padding:12px;border-radius:14px;background:#f8f0fc;border:1px solid #eebefa}.ue-links{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.belt-hint{display:block;margin:0 0 10px;padding:10px 14px;border-radius:14px;background:#f3f0ff;color:#5f3dc4;font-weight:800;text-decoration:none}
.up-opt.ultra{background:#f8f0fc}
.pts-toast{position:fixed;left:50%;bottom:calc(92px + env(safe-area-inset-bottom));transform:translate(-50%,30px);opacity:0;pointer-events:none;background:#22303c;color:#fff;padding:.7em 1.2em;border-radius:999px;font-weight:800;z-index:60;transition:.25s;max-width:92vw;text-align:center}
.pts-toast.on{opacity:1;transform:translate(-50%,0);pointer-events:auto}.pts-toast a{color:#ffd43b}
@media (min-width:821px){.pts-toast{bottom:28px}}
.done-form{margin-top:14px}.done-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.done-row input{width:90px}
.rw-grid{display:grid;gap:14px}
.kid-belts{list-style:none;padding:0;margin:0}.kid-belts a{display:flex;align-items:center;gap:12px;min-height:56px;text-decoration:none;color:var(--ink);border-bottom:1px dashed var(--line)}
.kb{flex:none;width:40px;height:14px;border-radius:6px;background:var(--c);border:1px solid rgba(0,0,0,.2)}.kb-go{margin-left:auto;font-size:1.5rem;color:var(--muted)}
.ref-code{background:#fff9db;border:2px dashed #fab005;border-radius:14px;text-align:center;padding:12px;margin:8px 0}.ref-code code{font-size:1.6rem;font-weight:900;letter-spacing:.08em}
.rewards-page label input{width:100%;margin-top:4px}.share-row{display:flex;gap:8px;margin-top:10px}.share-row .btn{flex:1;min-height:44px}
.refs{padding-left:18px}.rs{font-size:.8rem;font-weight:800;color:var(--muted)}.rs.joined_pro{color:#0a8a4b}
.toggle{display:flex;align-items:center;gap:12px;min-height:48px;border:0;background:none;font:inherit;font-weight:800;cursor:pointer;padding:0;color:var(--ink)}
.toggle .knob{width:54px;height:30px;border-radius:999px;background:#ced4da;position:relative;transition:.2s}.toggle .knob::after{content:"";position:absolute;left:3px;top:3px;width:24px;height:24px;border-radius:50%;background:#fff;transition:.2s}
.toggle.on .knob{background:#26de81}.toggle.on .knob::after{left:27px}
.rules li{margin:.3em 0}.ref-note{background:#fff9db;border-radius:10px;padding:.4em .7em}
.pack-list{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}.pack-item{display:flex;flex-direction:column;gap:4px;text-decoration:none;color:var(--ink)}
.cert-body{background:#f1f3f5;padding:20px}.cert{max-width:900px;margin:0 auto;background:#fff;border:14px solid var(--belt);outline:3px solid #22303c;outline-offset:-22px;padding:48px 32px;text-align:center}
.cert.gold{border-color:#e8b923}.cert h1{font-size:2.4rem}.cert-k{font-weight:900;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}.cert-name{font-size:2.6rem;font-weight:900;font-family:"Baloo 2",cursive;margin:.1em 0;border-bottom:2px solid #22303c;display:inline-block;padding:0 24px}
.cert-belt{font-size:1.6rem;font-weight:900}.cert-date{margin-top:24px;font-weight:700}
@media print{.noprint{display:none}.cert-body{background:#fff;padding:0}}
@media (min-width:760px){.belt-grid{grid-template-columns:1fr 1fr}.rw-grid{grid-template-columns:1fr 1fr}.perk-grid{grid-template-columns:repeat(3,1fr)}.bh-name{font-size:2.4rem}}
@media (max-width:420px){.perk-grid{grid-template-columns:1fr}.bh-top .belt-svg{width:96px;height:60px}.bh-name{font-size:1.6rem}}

/* ===== Make more like this + Free worksheet meter ===== */
.more-box{margin:.4em 0}.more-btn{background:#26a269;box-shadow:0 4px 0 #1c7a4f}
.more-ready{display:flex;flex-direction:column;gap:6px;padding:12px;border-radius:14px;background:#ebfbee;border:1px solid #b2f2bb;text-align:left}
.more-actions{display:flex;flex-wrap:wrap;gap:8px}.more-actions .btn{min-height:44px}
.more-limit,.more-ai{padding:10px 12px;border-radius:14px;background:#fff9db;border:1px solid #ffe066;margin:.4em 0}
.ws-meter{margin:10px 0;padding:10px 12px;border-radius:14px;background:#f1f6ff;border:1px solid #d6e0fb}.ws-meter.low{background:#fff9db;border-color:#ffe066}.ws-meter.full{background:#fff0f6;border-color:#fcc2d7}.ws-meter.unl{background:#ebfbee;border-color:#b2f2bb}
.wm-top{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap}.wm-bar{height:10px;border-radius:999px;background:#fff;margin-top:6px;overflow:hidden;border:1px solid rgba(0,0,0,.06)}
.wm-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--brand),#a55eea);border-radius:999px}.ws-meter.full .wm-bar span{background:#e64980}
.lib-head .ws-meter{max-width:420px}.unl-note{background:#ebfbee;border-radius:10px;padding:.4em .7em}
.upgrade-card .up-emoji{font-size:3rem}.sheet-list{list-style:none;padding:0}.sheet-list a{display:flex;flex-direction:column;padding:12px 14px;margin:8px 0;background:#fff;border:1px solid var(--line);border-radius:14px;text-decoration:none;color:var(--ink);min-height:56px}
.mixed-card{margin:12px 0;background:#f8f0fc;border-color:#eebefa}

/* ===== Solve mode ===== */
.btn-solve{background:#f76707;box-shadow:0 4px 0 #c2410c;font-size:1.1rem;padding:.9em 1.4em}
.solve-wrap{max-width:1180px;margin:0 auto;padding:12px 16px 120px}
.solve-head h1{font-size:1.6rem;margin:.2em 0}.solve-head .learner-l select{min-height:44px}
.solve-score{position:sticky;top:0;z-index:5;background:var(--bg);padding:8px 0}.ss-bar{height:10px;border-radius:999px;background:#eef1f5;overflow:hidden;margin-bottom:4px}.ss-bar span{display:block;height:100%;background:#2f9e44;transition:width .4s}
.ss-done{margin-top:6px;padding:10px 12px;border-radius:14px;background:#ebfbee;border:1px solid #b2f2bb;font-weight:800}
.solve-list{list-style:none;padding:0;margin:8px 0;display:grid;gap:10px}
.sp{display:grid;grid-template-columns:34px 1fr auto;gap:10px;align-items:start;background:#fff;border:2px solid var(--line);border-radius:18px;padding:12px;transition:border-color .2s,background .2s}
.sp.active{border-color:#91a7ff}.sp.right{border-color:#40c057;background:#f4fdf5}.sp.wrong{border-color:#ffa94d;background:#fff9f0}
.sp-n{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:#e7f5ff;font-weight:900;color:#1971c2}.sp.right .sp-n{background:#40c057;color:#fff;font-size:0}.sp.right .sp-n::after{content:"\2714";font-size:1rem}
.sp-q{font-size:1.25rem;font-weight:700;line-height:2.1}.pl{white-space:pre-wrap}
.ans{width:5.2em;min-height:44px;font-size:1.2rem;font-weight:800;text-align:center;padding:.2em .4em;margin:0 .2em;border:2px solid #bac8ff;border-radius:12px;background:#f8f9ff;vertical-align:middle}
.ans:focus{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px #dbe4ff}.sp.right .ans{border-color:#40c057;background:#ebfbee}.sp.wrong .ans{border-color:#ffa94d}
.blank{display:inline-block;min-width:2.4em;padding:0 .4em;border-bottom:3px solid #bac8ff;text-align:center;color:#adb5bd}.blank.filled{color:var(--ink)}
.chips-pick{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}.pick{min-height:48px;min-width:48px;padding:0 14px;border-radius:14px;border:2px solid #dee2e6;background:#fff;font:inherit;font-weight:800;font-size:1.05rem;cursor:pointer}.pick.on{border-color:var(--brand);background:#edf2ff}
.sp.right .pick.on{border-color:#40c057;background:#ebfbee}
.sp-msg{min-height:1.2em;font-weight:800;font-size:.95rem}.sp.right .sp-msg{color:#2b8a3e}.sp.wrong .sp-msg{color:#d9480f}
.sp-act{display:flex;flex-direction:column;gap:8px}.sp-check,.sp-help{width:48px;height:48px;border-radius:50%;border:0;font-size:1.3rem;font-weight:900;cursor:pointer}
.sp-check{background:#e6fcf5;color:#087f5b}.sp-help{background:#fff3bf;color:#e67700}.sp-help:hover,.sp-check:hover{filter:brightness(.95)}
.sv-c{margin:2px 0}.sv-count{display:flex;flex-wrap:wrap;gap:6px;font-size:1.7rem;max-width:300px}.sv-coins{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.coin{display:inline-grid;place-items:center;width:var(--r);height:var(--r);border-radius:50%;border:2px solid #868e96;font-size:.72rem;font-weight:900}
.sv-vert{display:inline-flex;flex-direction:column;align-items:flex-end;font-size:1.5rem;font-weight:800;font-variant-numeric:tabular-nums;border-bottom:3px solid #22303c;padding:0 6px;line-height:1.3}
.sv-ld{display:inline-flex;align-items:stretch;font-size:1.4rem;font-weight:800}.sv-ld .d{padding-right:6px}.sv-ld .n{border-left:3px solid #22303c;border-top:3px solid #22303c;border-top-left-radius:10px;padding:2px 8px}
.solve-foot{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:12px 0}
/* "?" panel: bottom sheet by default (phones, iPad portrait) */
.solve-panel{position:fixed;left:0;right:0;bottom:0;z-index:80;max-height:74vh;background:#fff;border-radius:22px 22px 0 0;box-shadow:0 -10px 40px rgba(0,0,0,.18);display:flex;flex-direction:column;padding-bottom:env(safe-area-inset-bottom)}
.solve-panel[hidden]{display:none}
.sp-head{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--line)}.sp-head::before{content:"";position:absolute;left:50%;top:6px;width:44px;height:5px;border-radius:9px;background:#dee2e6;transform:translateX(-50%)}
.sp-close{width:44px;height:44px;border-radius:50%;border:0;background:#f1f3f5;font-size:1.1rem;cursor:pointer}
.sp-body{overflow:auto;padding:12px 16px 20px}.sp-body .stack{display:grid;gap:12px}.sp-prob{font-size:1.2rem}
body.sheet-open .tabbar{display:none}
@media (min-width:1000px){
  .solve-wrap.panel-open{display:grid;grid-template-columns:1fr 1fr;gap:20px;max-width:1500px}
  .solve-wrap.panel-open .solve-panel{position:sticky;top:12px;align-self:start;max-height:calc(100vh - 24px);border-radius:22px;box-shadow:var(--shadow);border:1px solid var(--line)}
  .solve-wrap.panel-open .sp-head::before{display:none}
  body.sheet-open .tabbar{display:flex}
}
/* kid number pad (touch) */
.keypad{position:fixed;left:0;right:0;bottom:0;z-index:90;background:#f1f3f5;border-top:1px solid #dee2e6;padding:8px 8px calc(8px + env(safe-area-inset-bottom));box-shadow:0 -6px 20px rgba(0,0,0,.12)}
.keypad[hidden]{display:none}.kp-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;max-width:520px;margin:0 auto}
.kp-more,.kp-row{display:flex;gap:6px;max-width:520px;margin:6px auto 0;flex-wrap:wrap}.kp-more .kp{flex:1 0 56px}
.kp{min-height:52px;border:0;border-radius:14px;background:#fff;font:inherit;font-size:1.45rem;font-weight:900;box-shadow:0 2px 0 #ced4da;cursor:pointer;touch-action:manipulation}
.kp:active{transform:translateY(2px);box-shadow:none}.kp-s{font-size:1.1rem}.kp-next{flex:1;font-size:1.05rem}.kp-ok{flex:2;background:#40c057;color:#fff;font-size:1.1rem;box-shadow:0 2px 0 #2b8a3e}.kp-hide{flex:0 0 60px}
body.pad-open .tabbar{display:none}body.pad-open .solve-wrap{padding-bottom:340px}
@media (max-width:420px){.sp{grid-template-columns:28px 1fr 48px;padding:10px;gap:8px}.sp-q{font-size:1.1rem}.ans{width:4.4em}}
/* ---- visual explanation methods ---- */
.mcard{padding:14px 16px}
.mcard .xhead{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.mcard .fb{display:flex;gap:6px;align-items:center}
.say-btn,.replay-btn{border:1px solid var(--line);background:#fff;border-radius:999px;width:38px;height:38px;font-size:1.05rem;cursor:pointer}
.mviz-wrap{margin:10px 0 4px;background:#fbfcff;border:1px solid #edf0f7;border-radius:14px;padding:6px}
.mviz{display:block;max-width:520px;margin:0 auto;height:auto}
.xprompt{font-size:1.12rem;font-weight:800;margin:.5em 0 .25em;line-height:1.35}
.xhint{font-size:.98rem;color:#495057;margin:.2em 0 .6em;line-height:1.4}
.mcard .confused-btn{background:none;border:0;color:#6c757d;font-weight:700;cursor:pointer;padding:4px 0}
.mviz.anim>*{opacity:0;animation:mvin .35s ease forwards}
@keyframes mvin{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.theme-bar{display:flex;flex-wrap:wrap;gap:6px;align-items:center;justify-content:center;margin:8px 0 10px}
.theme-chip{width:40px;height:40px;border-radius:12px;border:2px solid var(--line);background:#fff;font-size:1.3rem;cursor:pointer;line-height:1}
.theme-chip.on{border-color:var(--brand);background:#e7f0ff;box-shadow:0 0 0 3px var(--brand)33}
.reveal-box{margin:14px 0 6px;text-align:center}
.reveal-ans{background:#fff9db;border:2px dashed #fab005;border-radius:14px;padding:12px;font-size:1.1rem}
.reveal-btn{margin-top:8px}
@media (max-width:600px){.mcard .tb-l{display:none}.xprompt{font-size:1.04rem}.mcard{padding:12px}}
/* ---------- whiteboard ---------- */
.kwb{display:flex;flex-direction:column;gap:6px}
.kwb-tools{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.kwb-c{width:30px;height:30px;border-radius:50%;border:3px solid #fff;background:var(--c);box-shadow:0 0 0 1.5px #ced4da;cursor:pointer}
.kwb-c.on{box-shadow:0 0 0 3px var(--brand)}
.kwb-b{min-width:36px;height:34px;border-radius:10px;border:1.5px solid #dee2e6;background:#fff;font-size:1.05rem;cursor:pointer}
.kwb-b.on{background:#e7f5ff;border-color:var(--brand)}
.kwb-stage{position:relative;width:100%;border-radius:14px;border:1.5px solid #d0d7e2;overflow:hidden;
  background-color:#fff;background-image:radial-gradient(#d5dbe3 1px,transparent 1.2px);background-size:22px 22px}
.kwb-stage>svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.kwb-canvas{position:absolute;inset:0;touch-action:none;cursor:crosshair}
/* ---------- show your work ---------- */
.sw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin-top:14px}
.sw-tile h3{margin:.4em 0 .2em}.sw-acts{display:flex;gap:8px;flex-wrap:wrap}
.sw-wrap{max-width:980px;margin:0 auto;padding:16px}
.sw-bar{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:6px 0 10px}
.sw-list{list-style:none;padding:0;display:flex;flex-direction:column;gap:16px}
.sw-p{padding:14px 16px;border:2px solid transparent}.sw-p.ok{border-color:#69db7c}.sw-p.no{border-color:#ffa94d}
.sw-q{display:flex;gap:10px;align-items:flex-start;flex-wrap:wrap}.sw-q p{flex:1;min-width:200px;margin:0;font-size:1.12rem;line-height:1.45}
.sw-n{flex:none;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:800}
.sw-plan{margin:8px 0 4px 40px;color:#495057}.sw-plan li{margin:2px 0}
.sw-tabs{display:flex;gap:6px;margin:10px 0 6px}.sw-tabs button{border:1.5px solid #dee2e6;background:#fff;border-radius:999px;padding:5px 12px;font-weight:700;cursor:pointer}
.sw-tabs button.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.sw-typed{width:100%;font:1.05rem/1.5 "Andika",system-ui,sans-serif;border:1.5px solid #d0d7e2;border-radius:12px;padding:10px}
.sw-grid-rows{display:flex;flex-direction:column;gap:6px;margin:10px 0}.sw-grid-rows label{display:flex;gap:8px;align-items:center}
.sw-grid-rows span{min-width:110px;font-weight:700}.sw-grid-rows input{width:110px}.sw-gm.right{color:#2b8a3e}.sw-gm.wrong{color:#d9480f}
.sw-ans{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:10px;font-weight:700}
.sw-ans input,.sw-grid-rows input{font:700 1.15rem "Andika",sans-serif;border:2px solid #bac8ff;border-radius:10px;padding:6px 10px;width:130px}
.sw-msg{margin:6px 0 0;font-weight:700}.sw-msg.good{color:#2b8a3e}.sw-msg.warn{color:#d9480f}
.sw-reveal{margin-top:6px}
/* ---------- TK tracing ---------- */
.tk-wrap{max-width:1100px;margin:0 auto;padding:16px}
.tk-thumb{height:90px;display:flex;justify-content:center}.tk-thumb svg{height:100%;width:auto}
.tk-stars{font-size:1.1rem}.tk-crayons{display:flex;gap:8px;align-items:center;margin:4px 0 12px;font-size:1.3rem}
.tk-rows{display:flex;flex-direction:column;gap:14px}
.tk-row{background:#fff;border-radius:18px;box-shadow:var(--shadow);padding:10px 12px}
.tk-label{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:6px;font-size:1.05rem}
.tk-say{border:0;background:#fff3bf;border-radius:50%;width:34px;height:34px;font-size:1rem;cursor:pointer}
.tk-msg{font-weight:700;font-size:.95rem;flex-basis:100%;min-height:1.4em}.tk-msg.good{color:#2b8a3e}.tk-msg.warn{color:#e8590c}
.tk-items{display:flex;flex-wrap:wrap;gap:8px;align-items:flex-end}
.tk-item{position:relative;height:130px;aspect-ratio:var(--ar);border-radius:12px;background:#fff;border:1.5px solid #e9ecef}
.tk-item.model{background:#f8f9ff;border-color:#dbe4ff}.tk-item.model svg{width:100%;height:100%}
.tk-item.done{border-color:#8ce99a;background:#f4fce3}
.tk-row.line .tk-item{height:auto;width:100%;max-width:900px}.tk-row.pic .tk-item{height:auto;width:min(100%,420px)}
.tk-item.big{height:min(62vh,460px)}.tk-row.line .tk-item.big,.tk-row.pic .tk-item.big{height:auto;width:100%;max-width:760px}
.tk-board{position:absolute;inset:0}.tk-board .kwb-stage{border:0;background:transparent;border-radius:12px}
.tk-row.line .tk-board,.tk-row.pic .tk-board,.tk-item.big .tk-board{position:relative}
/* controls live in a strip UNDER the item so they never cover the dots a child is tracing */
.tk-items{row-gap:40px;padding-bottom:34px}
.tk-zoom,.tk-redo{position:absolute;top:calc(100% + 4px);width:28px;height:28px;border-radius:50%;border:1px solid #dee2e6;background:#fff;font-size:.85rem;cursor:pointer;z-index:2}
.tk-zoom{right:0}.tk-redo{right:32px}
.tk-badge{position:absolute;left:4px;bottom:1px;pointer-events:none;color:#fab005;font-size:1rem;letter-spacing:-1px;z-index:2}.tk-badge .off{color:#dee2e6}
.tk-count{display:flex;flex-wrap:wrap;gap:8px;max-width:200px;margin-left:10px}
.tk-dot{width:30px;height:30px;border-radius:50%;border:3px solid #f76707;background:#ffe8cc;cursor:pointer}.tk-dot.on{background:#f76707}
@media (max-width:600px){.tk-item{height:150px}}

.kwb,.tk-item,.tk-items{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.extra-links{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 12px}
/* ---- post-photo menu (public/photo.js) ---- */
.pm{display:flex;flex-direction:column;gap:10px}.pm-q{font-size:1.05rem}
.pm-opt{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;min-height:64px;padding:12px 14px;border-radius:16px;border:2px solid #e1e5ec;background:#fff;font:inherit;color:var(--ink);cursor:pointer}
.pm-opt:hover,.pm-opt:focus-visible{border-color:var(--brand);background:#f6f9ff}.pm-opt small{display:block;color:var(--muted);font-size:.86rem;margin-top:2px}
.pm-n{flex:none;display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;font-weight:900}
.pm-busy{font-weight:800;color:var(--brand)}.pm-err{color:#c92a2a;min-height:1.2em}
.pm-found{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin:.2em 0}.pm-found .dot{width:12px;height:12px;border-radius:50%}
.seg{display:flex;gap:4px;padding:4px;background:#f1f3f7;border-radius:14px;flex-wrap:wrap}.seg-b{flex:1;min-height:44px;border:0;border-radius:11px;background:none;font:inherit;font-weight:800;color:var(--ink);cursor:pointer;padding:0 10px}.seg-b.on{background:#fff;color:var(--brand);box-shadow:0 2px 6px rgba(0,0,0,.08)}
.pm-cols,.pm-grid{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}.chip-b{min-height:40px;min-width:40px;padding:0 12px;border-radius:999px;border:2px solid #e1e5ec;background:#fff;font:inherit;font-weight:800;cursor:pointer}.chip-b.on{background:var(--brand);border-color:var(--brand);color:#fff}
.pm-list{list-style:none;padding:0;margin:6px 0;max-height:300px;overflow:auto;border:1px solid var(--line);border-radius:14px}.pm-list li{border-bottom:1px dashed var(--line)}.pm-list li:last-child{border:0}
.pm-list label{display:flex;align-items:center;gap:10px;min-height:44px;padding:4px 10px;cursor:pointer}.pm-list input{width:20px;height:20px;padding:0}
.pm-pn{display:inline-grid;place-items:center;min-width:26px;height:26px;border-radius:50%;background:#fff3bf;font-weight:900;font-size:.85rem}
.pm-acts{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}.link-b{border:0;background:none;color:var(--brand);font:inherit;text-decoration:underline;cursor:pointer;padding:8px 0}
.pm-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:8px 0}.pm-row label{flex-basis:100%}.pm-row input{flex:1;min-width:120px}
.pm-manual textarea{width:100%;box-sizing:border-box;font:inherit;padding:.6em .8em;border:2px solid #e1e5ec;border-radius:12px;margin-top:4px}
.pm-crop{position:relative;touch-action:none;user-select:none;max-width:100%;border-radius:12px;overflow:hidden;border:2px dashed #c5d3f6;cursor:crosshair}.pm-crop img{display:block;width:100%;height:auto;pointer-events:none}
.pm-sel{position:absolute;border:3px solid var(--sun);background:rgba(247,183,49,.15);box-shadow:0 0 0 9999px rgba(0,0,0,.35)}
.pm-deliver{display:flex;flex-direction:column;gap:10px}.pack{background:#f6f9ff;border-radius:16px;padding:12px}.pack .pack-list{list-style:none;padding:0;display:flex;flex-direction:column;gap:6px;margin:10px 0}
.pack .pack-list li{display:flex;flex-wrap:wrap;gap:10px;align-items:center;min-height:44px;background:#fff;border-radius:12px;padding:6px 12px}.pack .pack-list a{font-weight:800;text-decoration:none}
.snap-card:has(.pm),.snap-card:has(.pm-confirm),.snap-card:has(.pm-manual),.snap-card:has(.pm-deliver){flex-direction:column}
.snap-card:has(.pm-manual)>img{display:none}
/* ---- scratch whiteboard in solve mode ---- */
.sp-draw{width:48px;height:48px;border-radius:50%;border:0;background:#f3f0ff;font-size:1.2rem;cursor:pointer}.sp-wb{margin-top:10px}
/* ---- guided mode ("Help me with the whole worksheet") ---- */
.solve-wrap.guided .sp:not(.current){display:none}.solve-wrap.guided .sp.current{border-color:#c5d3f6;box-shadow:var(--shadow)}
.guide-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:8px 0}
.coach{background:#fff;border:2px solid #d3f9d8;border-radius:20px;padding:12px;margin-top:14px;box-shadow:var(--shadow)}
.coach-head{display:flex;align-items:center;gap:8px}.coach-av{font-size:1.8rem}.coach-log{display:flex;flex-direction:column;gap:8px;max-height:46vh;overflow:auto;margin-top:8px}
.coach-msg{background:#f8f9fa;border-radius:14px 14px 14px 4px;padding:8px 12px}.coach-msg p{margin:0}.coach-msg.cheer{background:#ebfbee}.coach-msg.hint{background:#fff9db}.coach-msg.nudge{background:#e7f5ff}.coach-msg .btn{margin-top:6px}
@media (min-width:1000px){
  .solve-wrap.guided{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:20px;align-items:start}
  .solve-wrap.guided.panel-open{grid-template-columns:minmax(0,1fr) minmax(0,1fr) 300px;max-width:1600px}
  .solve-wrap.guided .coach{position:sticky;top:12px;margin-top:0;grid-column:-2/-1;grid-row:1}
}
/* ---- Toodoo Academy brand ---- */
.logo-img{width:40px;height:40px;object-fit:contain}.brand-2{color:var(--brand)}
.btn-sun{background:var(--sun);color:#1f3324;box-shadow:0 4px 0 #d9a21b}.btn-sun:hover{filter:brightness(1.03)}
.hero-brand{background:radial-gradient(circle at 12% 15%,#fff3b0 0,transparent 38%),radial-gradient(circle at 88% 20%,#d8f5c0 0,transparent 45%),radial-gradient(circle at 70% 95%,#e6f9d4 0,transparent 40%)}
.hero-brand .hl{background:linear-gradient(transparent 60%,#ffe27a 60%)}.hero-brand .eyebrow{border-color:#bfe89a;color:var(--brandDark)}
.brand-art{display:flex;justify-content:center;align-items:center}
.app-cta{margin:18px 0 14px;padding:16px 18px;border:2px solid #cdeeb3}.app-cta h2{margin:0 0 2px;font-size:1.4rem}
.store-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}
.store-btn{position:relative;display:inline-flex;align-items:center;gap:10px;min-height:56px;padding:6px 16px 6px 12px;border-radius:14px;background:#1f3324;color:#fff;text-decoration:none;min-width:170px}
.store-btn small{display:block;font-size:.7rem;opacity:.85;line-height:1}.store-btn b{display:block;font-size:1.1rem;line-height:1.15}.st-ic{font-size:1.5rem;width:26px;text-align:center}
.store-btn em{position:absolute;top:-9px;right:-6px;background:var(--sun);color:#1f3324;font-style:normal;font-weight:900;font-size:.68rem;padding:2px 8px;border-radius:999px;box-shadow:0 2px 0 #d9a21b}
.store-btn.soon{opacity:.92}.store-btn:focus-visible{outline:3px solid var(--sun);outline-offset:2px}
/* mascot + poses (one image, CSS motion) */
.toodoo{display:flex;align-items:flex-end;gap:10px}.toodoo-img{display:block;height:auto;object-fit:contain;transform-origin:50% 90%}
.toodoo.sm .toodoo-img{width:64px}.toodoo.md .toodoo-img{width:96px}.toodoo.lg{flex-direction:column-reverse;align-items:center}.toodoo.lg .toodoo-img{width:min(300px,70vw)}
.toodoo-say{position:relative;margin:0;background:#fff;border:2px solid #cdeeb3;border-radius:18px;padding:10px 14px;font-weight:800;color:var(--ink);box-shadow:var(--shadow);max-width:34ch}
.toodoo:not(.lg) .toodoo-say{border-bottom-left-radius:4px}
.toodoo.lg .toodoo-say{font-size:1.15rem;text-align:center;margin-bottom:6px}.toodoo.lg .toodoo-say::after{content:"";position:absolute;left:50%;bottom:-11px;margin-left:-10px;border:10px solid transparent;border-top-color:#cdeeb3;border-bottom:0}
.toodoo.tip{margin:6px 0 4px}.toodoo.peek{flex-direction:column;align-items:center;text-align:center}.empty .toodoo,.nf-card .toodoo{margin:0 auto 8px}
.toodoo.wave .toodoo-img{animation:td-wave 2.4s ease-in-out infinite}.toodoo.bounce .toodoo-img{animation:td-bounce 1.8s ease-in-out infinite}.toodoo.peek .toodoo-img{animation:td-peek 3s ease-in-out infinite}
@keyframes td-wave{0%,60%,100%{transform:rotate(0)}15%{transform:rotate(-6deg)}30%{transform:rotate(5deg)}45%{transform:rotate(-3deg)}}
@keyframes td-bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@keyframes td-peek{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-4px) rotate(-4deg)}}
.toodoo-pop{position:fixed;left:14px;bottom:calc(84px + env(safe-area-inset-bottom));z-index:120;display:flex;align-items:flex-end;gap:8px;pointer-events:none;opacity:0;transform:translateY(30px) scale(.9);transition:opacity .25s,transform .25s}
.toodoo-pop.show{opacity:1;transform:none}.toodoo-pop img{width:72px;height:auto}.toodoo-pop p{margin:0 0 18px;background:#fff;border:2px solid #b2e68c;border-radius:18px 18px 18px 4px;padding:8px 12px;font-weight:900;box-shadow:var(--shadow);max-width:60vw}
.toodoo-pop.show.cheer img{animation:td-bounce .6s ease-in-out 3}.toodoo-pop.soft p{border-color:#ffe08a}
@media (min-width:1000px){.toodoo-pop{bottom:24px;left:24px}}
@media (prefers-reduced-motion:reduce){.toodoo .toodoo-img,.toodoo-pop img{animation:none!important}.toodoo-pop{transition:none}}
body.pad-open .toodoo-pop{bottom:calc(330px + env(safe-area-inset-bottom))}