/* GenieLearn design system: playful clay, one radius scale, tactile 3D buttons.
   Radii: cards 24px, buttons & tiles 18px, chips pill. Light theme only: lessons are drawn on paper. */
:root{
  color-scheme:light;
  --ground:#f3f5fb;--paper:#fff;--ink:#1b2140;--ink2:#5a6284;--ink3:#8d93ad;--line:#e6eaf4;--soft:#eef1f9;
  --cobalt:#4361ee;--cobalt-d:#2e47c9;--cobalt-l:#e8ecff;
  --coral:#ff6b4a;--coral-d:#dc4c2c;--coral-l:#fff0ec;
  --mint:#12b886;--mint-d:#0b946b;--mint-l:#e3f8f0;
  --rose:#e64980;--rose-d:#bf2f63;--rose-l:#fdecf3;
  --sun:#ffb020;--sun-d:#dc8c00;--sun-l:#fff5de;
  --red:#f03e3e;--red-d:#c92a2a;--red-l:#ffeded;
  --grape:#7950f2;--grape-l:#f1ecff;
  --r-card:24px;--r-btn:18px;
  --clay:0 1px 0 rgba(27,33,64,.04),0 10px 28px -12px rgba(46,71,201,.22),inset 0 -3px 0 rgba(27,33,64,.05);
  --clay-lg:0 2px 0 rgba(27,33,64,.04),0 24px 48px -20px rgba(46,71,201,.32),inset 0 -4px 0 rgba(27,33,64,.06);
  --ease-out:cubic-bezier(.23,1,.32,1);--ease-io:cubic-bezier(.77,0,.175,1);--spring:cubic-bezier(.34,1.56,.64,1);
  --display:"Baloo 2","Nunito",ui-rounded,"PingFang SC","Hiragino Sans GB",system-ui,sans-serif;
  --body:"Nunito",ui-rounded,"PingFang SC","Hiragino Sans GB",system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{font-family:var(--body);font-weight:600;background:var(--ground);color:var(--ink);min-height:100dvh;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(900px 500px at 110% -10%,#e5eaff 0%,transparent 60%),radial-gradient(700px 480px at -20% 110%,#fff1e2 0%,transparent 60%)}
button{font-family:inherit;font-weight:inherit;cursor:pointer;border:none;background:none;color:inherit;touch-action:manipulation}
input,textarea{font-family:inherit}
h1,h2,h3,h4{font-family:var(--display);font-weight:700;line-height:1.15;letter-spacing:-.01em}
.hidden{display:none!important}
.muted{color:var(--ink3)}.small{font-size:.86rem}
.ph{line-height:1;vertical-align:-.12em}
:focus-visible{outline:3px solid var(--cobalt);outline-offset:3px;border-radius:12px}

/* ---------- layout ---------- */
.wrap{max-width:980px;margin:0 auto;padding:12px 20px calc(120px + env(safe-area-inset-bottom))}
.stack{display:flex;flex-direction:column;gap:14px}
.sec{margin:28px 2px 12px;display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.sec h2{font-size:1.35rem}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.list{display:flex;flex-direction:column;gap:10px}

/* view enter: children rise in with a short stagger */
.enter>*{animation:rise .42s var(--ease-out) both;animation-delay:calc(var(--i,0) * 45ms)}
@keyframes rise{from{opacity:0;transform:translateY(14px) scale(.985)}to{opacity:1;transform:none}}
@keyframes pop{0%{transform:scale(.9);opacity:0}100%{transform:scale(1);opacity:1}}

/* ---------- surfaces ---------- */
.card{background:var(--paper);border-radius:var(--r-card);box-shadow:var(--clay);padding:20px}
.pill{display:inline-flex;align-items:center;gap:5px;border-radius:999px;padding:5px 11px;font-size:.78rem;font-weight:800;background:var(--soft);color:var(--ink2)}
.chip{display:inline-flex;align-items:center;gap:6px;background:var(--soft);border-radius:999px;padding:8px 14px;font-weight:800;font-size:.85rem;color:var(--ink2);transition:transform .16s var(--ease-out),background .2s}
.chip:active{transform:scale(.96)}.chip.on{background:var(--cobalt);color:#fff}

/* ---------- tactile buttons ---------- */
.btn{--b:var(--cobalt);--bd:var(--cobalt-d);display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--b);color:#fff;border-radius:var(--r-btn);
  padding:14px 22px;font-family:var(--display);font-weight:700;font-size:1.08rem;letter-spacing:.01em;box-shadow:0 5px 0 var(--bd);transform:translateY(0);
  transition:transform .12s var(--ease-out),box-shadow .12s var(--ease-out),filter .2s;white-space:nowrap}
.btn:active{transform:translateY(4px);box-shadow:0 1px 0 var(--bd)}
.btn.o{--b:var(--coral);--bd:var(--coral-d)}.btn.g{--b:var(--mint);--bd:var(--mint-d)}.btn.r{--b:var(--red);--bd:var(--red-d)}
.btn.sun{--b:var(--sun);--bd:var(--sun-d);color:#3b2600}
.btn.ghost{--b:var(--paper);--bd:#d9def0;color:var(--ink);box-shadow:0 5px 0 var(--bd),inset 0 0 0 2px var(--line)}
.btn.ghost:active{box-shadow:0 1px 0 var(--bd),inset 0 0 0 2px var(--line)}
.btn.wide{width:100%}.btn.sm{padding:10px 16px;font-size:.95rem;border-radius:14px}
.btn:disabled{filter:grayscale(.6) opacity(.55);pointer-events:none}
.wbtn{padding:9px 14px;font-size:.9rem;margin:0;border-radius:14px}
.link{color:var(--cobalt);font-weight:800;padding:6px 2px}
.back{display:inline-flex;align-items:center;gap:6px;color:var(--ink2);font-weight:800;padding:8px 14px 8px 10px;margin:2px 0 6px -4px;border-radius:999px;background:rgba(255,255,255,.7);box-shadow:var(--clay)}
.back:active{transform:scale(.96)}

/* ---------- login ---------- */
#login{min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:24px;
  background:radial-gradient(120% 90% at 50% 0%,#5f7bff 0%,#4361ee 45%,#2c3fb8 100%);color:#fff;position:relative;overflow:hidden}
#login .stars i{position:absolute;width:6px;height:6px;border-radius:50%;background:#fff;opacity:.5;animation:twinkle 3s ease-in-out infinite}
@keyframes twinkle{50%{opacity:.1;transform:scale(.6)}}
#login h1{font-size:2.6rem;margin-top:4px}#login .sub{opacity:.85;font-weight:700}
.pinDots{display:flex;gap:16px;margin:10px 0 4px}.pinDots span{width:18px;height:18px;border-radius:50%;background:rgba(255,255,255,.22);transition:transform .2s var(--spring),background .15s}
.pinDots span.on{background:#fff;transform:scale(1.15)}
.pinDots.shake{animation:shake .4s var(--ease-io)}
@keyframes shake{20%,60%{transform:translateX(-10px)}40%,80%{transform:translateX(10px)}}
.pad{display:grid;grid-template-columns:repeat(3,84px);gap:14px}
.pad button{height:74px;border-radius:22px;background:rgba(255,255,255,.14);font-family:var(--display);font-size:1.9rem;font-weight:700;color:#fff;
  box-shadow:inset 0 -4px 0 rgba(0,0,0,.12),inset 0 1px 0 rgba(255,255,255,.2);transition:transform .12s var(--ease-out),background .15s}
.pad button:active{transform:scale(.93);background:rgba(255,255,255,.26)}
#pinErr{min-height:1.3em;font-weight:800}

/* ---------- mascot ---------- */
svg.genie{width:120px;height:120px;display:block}
.genie .body{transform-origin:50% 90%;animation:float 3.2s ease-in-out infinite}
.genie .eye{transform-box:fill-box;transform-origin:center;animation:blink 4.6s infinite}
.genie.happy .body{animation:hop .7s var(--spring) 2}
.genie.think .body{animation:tilt 1.2s var(--ease-io) 1}
@keyframes float{50%{transform:translateY(-6px)}}
@keyframes blink{0%,94%,100%{transform:scaleY(1)}96%{transform:scaleY(.1)}}
@keyframes hop{30%{transform:translateY(-18px) scale(1.04,.96)}60%{transform:translateY(0) scale(.97,1.03)}}
@keyframes tilt{30%{transform:rotate(-9deg)}70%{transform:rotate(6deg)}}

/* ---------- top bar ---------- */
header.top{position:sticky;top:0;z-index:30;padding:calc(10px + env(safe-area-inset-top)) 20px 10px;
  background:linear-gradient(var(--ground) 60%,rgba(243,245,251,0));}
.topin{max-width:980px;margin:0 auto;display:flex;align-items:center;gap:10px}
.av{width:48px;height:48px;border-radius:16px;background:var(--paper);box-shadow:var(--clay);display:grid;place-items:center;font-size:1.7rem;flex:none}
.who{flex:1;min-width:0}.who b{display:block;font-family:var(--display);font-size:1.2rem;line-height:1.1}.who span{color:var(--ink3);font-size:.82rem;font-weight:700}
.stat{display:flex;align-items:center;gap:6px;background:var(--paper);box-shadow:var(--clay);border-radius:999px;padding:8px 13px 8px 10px;font-family:var(--display);font-weight:700;font-size:1.02rem}
.stat .ph{font-size:1.25rem}.stat.fire .ph{color:var(--coral)}.stat.star .ph{color:var(--sun)}
.stat.bump{animation:bump .5s var(--spring)}@keyframes bump{40%{transform:scale(1.18)}}
#lvlChip{background:var(--ink);color:#fff;border-radius:999px;padding:9px 14px;font-family:var(--display);font-weight:700;display:flex;align-items:center;gap:6px}
.iconbtn{width:42px;height:42px;border-radius:14px;background:var(--paper);box-shadow:var(--clay);display:grid;place-items:center;font-size:1.25rem;color:var(--ink2);flex:none}
.iconbtn:active{transform:scale(.94)}

/* ---------- floating tab bar ---------- */
nav.bottom{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(14px + env(safe-area-inset-bottom));z-index:30;display:flex;gap:4px;padding:7px;
  background:rgba(27,33,64,.92);-webkit-backdrop-filter:blur(16px) saturate(160%);backdrop-filter:blur(16px) saturate(160%);border-radius:26px;box-shadow:0 18px 40px -14px rgba(27,33,64,.55)}
nav.bottom .ind{position:absolute;top:7px;left:0;height:calc(100% - 14px);border-radius:20px;background:#fff;transition:transform .38s var(--spring),width .38s var(--spring);z-index:0}
nav.bottom button{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;gap:1px;min-width:74px;padding:8px 12px;border-radius:20px;color:rgba(255,255,255,.62);font-size:.74rem;font-weight:800;transition:color .25s}
nav.bottom button .ph{font-size:1.5rem}
nav.bottom button.on{color:var(--ink)}
nav.bottom button:active{transform:scale(.94)}

/* ---------- home ---------- */
.hero{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;border-radius:32px;padding:26px 26px 24px;color:#fff;position:relative;overflow:hidden;
  background:radial-gradient(120% 140% at 0% 0%,#6a84ff 0%,#4361ee 50%,#3346c9 100%);box-shadow:var(--clay-lg)}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,.08)}
.hero h1{font-size:2.1rem}.hero p{opacity:.9;margin-top:6px;font-weight:700;max-width:46ch}
.hero svg.genie{width:132px;height:132px;position:relative;z-index:1}
.hero .go{margin-top:16px}
.goal{display:flex;gap:16px;align-items:center}
.goalring{position:relative;width:64px;height:64px;flex:none}.goalring svg{transform:rotate(-90deg)}
.goalring b{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--display);font-size:1rem}
.goalring circle.v{transition:stroke-dashoffset 1.1s var(--ease-out)}
.statsrow{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
.tile{background:var(--paper);border-radius:var(--r-card);box-shadow:var(--clay);padding:16px;display:flex;align-items:center;gap:12px}
.tile .ic{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;font-size:1.5rem;flex:none}
.tile b{font-family:var(--display);font-size:1.45rem;line-height:1;display:block}.tile span{color:var(--ink3);font-size:.8rem;font-weight:800}

.subjgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.subj{--c:var(--cobalt);--cl:var(--cobalt-l);position:relative;overflow:hidden;background:var(--paper);border-radius:var(--r-card);box-shadow:var(--clay);padding:18px 16px 16px;
  display:flex;flex-direction:column;align-items:flex-start;gap:10px;text-align:left;min-height:178px;transition:transform .18s var(--ease-out)}
.subj:active{transform:scale(.97)}
.subj::before{content:"";position:absolute;right:-30px;bottom:-30px;width:120px;height:120px;border-radius:50%;background:var(--cl)}
.subj .badge{width:54px;height:54px;border-radius:17px;background:var(--c);color:#fff;display:grid;place-items:center;font-size:1.7rem;box-shadow:0 5px 0 rgba(0,0,0,.14);position:relative;font-family:var(--display);font-weight:800}
.subj h3{font-size:1.25rem;position:relative}.subj .meta{color:var(--ink3);font-size:.82rem;font-weight:800;position:relative}
.meter{position:relative;height:10px;width:100%;border-radius:999px;background:var(--soft);overflow:hidden;margin-top:auto}
.meter i{position:absolute;inset:0 auto 0 0;border-radius:999px;background:var(--c,var(--mint));transform-origin:left;animation:grow .9s var(--ease-out) both .15s}
@keyframes grow{from{transform:scaleX(0)}}

.plan{background:var(--paper);border-radius:var(--r-card);box-shadow:var(--clay);padding:18px 20px}
.plan h3{font-size:1.15rem}
.wkitems{display:flex;flex-wrap:wrap;gap:7px;margin-top:12px}
.wki{display:inline-flex;align-items:center;gap:6px;background:var(--soft);border-radius:999px;padding:6px 12px;font-size:.82rem;font-weight:800;color:var(--ink2)}
.wki.done{background:var(--mint-l);color:var(--mint-d)}
.fixcard{display:flex;gap:16px;align-items:center;background:linear-gradient(135deg,#fff0ec,#ffe1d9);border-radius:var(--r-card);padding:18px 20px;box-shadow:var(--clay)}
.fixcard .ic{width:56px;height:56px;border-radius:18px;background:var(--coral);color:#fff;display:grid;place-items:center;font-size:1.8rem;box-shadow:0 5px 0 var(--coral-d);flex:none}

.row{background:var(--paper);border-radius:20px;box-shadow:var(--clay);padding:14px 16px;display:flex;gap:14px;align-items:center;text-align:left;width:100%;transition:transform .16s var(--ease-out)}
button.row:active{transform:scale(.985)}
.row .em{width:46px;height:46px;border-radius:15px;display:grid;place-items:center;font-size:1.4rem;flex:none;background:var(--soft)}
.row .body{flex:1;min-width:0}.row h4{font-size:1.08rem;margin-bottom:3px}
.chev{color:var(--ink3);font-size:1.3rem}
.bar{height:8px;border-radius:999px;background:var(--soft);overflow:hidden;margin-top:8px}
.bar i{display:block;height:100%;border-radius:999px;background:var(--mint);transform-origin:left;animation:grow .8s var(--ease-out) both .1s}

/* ---------- subject + topic ---------- */
.banner{border-radius:28px;padding:22px 22px 20px;color:#fff;display:flex;gap:16px;align-items:center;box-shadow:var(--clay-lg);position:relative;overflow:hidden}
.banner::after{content:"";position:absolute;right:-40px;top:-50px;width:200px;height:200px;border-radius:50%;background:rgba(255,255,255,.1)}
.banner .badge{width:64px;height:64px;border-radius:20px;background:rgba(255,255,255,.2);display:grid;place-items:center;font-size:2rem;font-family:var(--display);font-weight:800;flex:none}
.banner h1{font-size:1.9rem}.banner p{opacity:.9;font-weight:700;margin-top:2px}
.term{font-family:var(--display);font-weight:700;color:var(--ink3);font-size:.95rem;margin:22px 4px 8px}
.path{display:flex;flex-direction:column;gap:10px}
.lrow{display:flex;gap:14px;align-items:center;background:var(--paper);border-radius:20px;box-shadow:var(--clay);padding:14px 16px;width:100%;text-align:left;transition:transform .16s var(--ease-out)}
.lrow:active{transform:scale(.985)}
.lrow .n{width:44px;height:44px;border-radius:50%;background:var(--soft);display:grid;place-items:center;font-family:var(--display);font-weight:800;font-size:1.1rem;flex:none;color:var(--ink2)}
.lrow.done .n{background:var(--mint);color:#fff;box-shadow:0 4px 0 var(--mint-d)}
.lrow.next .n{background:var(--cobalt);color:#fff;box-shadow:0 4px 0 var(--cobalt-d);animation:nudge 2.4s var(--ease-io) infinite}
@keyframes nudge{0%,80%,100%{transform:scale(1)}90%{transform:scale(1.1)}}
.tier{display:flex;gap:14px;align-items:center;border-radius:22px;padding:16px;width:100%;text-align:left;box-shadow:var(--clay);background:var(--paper);transition:transform .16s var(--ease-out)}
.tier:active{transform:scale(.985)}
.tier .badge{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;font-size:1.6rem;flex:none;color:#fff}
.tiers{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.hooks{display:grid;gap:10px}
.hook{display:flex;gap:12px;align-items:flex-start;background:var(--sun-l);border-radius:18px;padding:14px 16px;line-height:1.55}
.hook .ph{color:var(--sun-d);font-size:1.3rem;margin-top:2px}

/* ---------- player (lesson / practice / review / examples) ---------- */
.player{max-width:760px;margin:0 auto}
.phead{display:flex;align-items:center;gap:12px;margin:4px 0 14px}
.phead .x{width:44px;height:44px;border-radius:14px;background:var(--paper);box-shadow:var(--clay);display:grid;place-items:center;font-size:1.3rem;color:var(--ink2);flex:none}
.prog{flex:1;height:16px;border-radius:999px;background:#e2e6f3;overflow:hidden;position:relative}
.prog i{position:absolute;inset:0 auto 0 0;border-radius:999px;background:var(--mint);transition:width .5s var(--spring)}
.prog i::after{content:"";position:absolute;left:8px;right:8px;top:3px;height:4px;border-radius:999px;background:rgba(255,255,255,.35)}
.streakpill{display:flex;align-items:center;gap:4px;font-family:var(--display);font-weight:800;color:var(--coral);font-size:1.1rem;min-width:44px;justify-content:flex-end}
.streakpill.hot{animation:bump .5s var(--spring)}
.stage{background:var(--paper);border-radius:28px;box-shadow:var(--clay-lg);padding:24px;min-height:380px;position:relative}
.stage.swap{animation:slidein .38s var(--ease-out) both}
@keyframes slidein{from{opacity:0;transform:translateX(26px)}to{opacity:1;transform:none}}
.kicker{display:inline-flex;align-items:center;gap:6px;font-family:var(--display);font-weight:700;font-size:.92rem;color:var(--ink3)}
.stage h2{font-size:1.6rem;margin:6px 0 14px}
.stage p.lead{font-size:1.14rem;line-height:1.65;font-weight:600;color:#2a3155}
.p2 .stage p.lead{font-size:1.3rem}
.stage p.lead mark{background:linear-gradient(transparent 55%,var(--sun-l) 55%);color:inherit;font-weight:800;padding:0 2px;border-radius:3px}
.vis{position:relative;background:#fbfcff;border:2px solid var(--line);border-radius:20px;padding:14px;margin:4px 0 16px;overflow-x:auto}
.vis .replay{position:absolute;right:10px;top:10px;width:36px;height:36px;border-radius:12px;background:var(--paper);box-shadow:var(--clay);display:grid;place-items:center;color:var(--ink2);font-size:1.1rem;z-index:2}
.vis .tapnote{position:absolute;left:12px;bottom:8px;font-size:.74rem;font-weight:800;color:var(--ink3);display:flex;gap:4px;align-items:center}
.vis svg [data-tap]{cursor:pointer}
.vis svg .wig{animation:wig .5s var(--spring)}
@keyframes wig{30%{transform:scale(1.12) rotate(-3deg)}60%{transform:scale(.96) rotate(2deg)}}
.vtable{border-collapse:collapse;width:100%;font-size:1rem}.vtable th{background:var(--soft);text-align:left;padding:10px 12px;font-family:var(--display);font-weight:700}
.vtable td{padding:10px 12px;border-top:2px solid var(--soft);vertical-align:top}
.vimg img{max-width:100%;border-radius:14px}.vimg figcaption{font-size:.82rem;color:var(--ink3);text-align:center;margin-top:6px}
.actionbar{display:flex;gap:12px;align-items:center;margin-top:18px}
.actionbar .btn{flex:1}.actionbar .btn.ghost{flex:0 0 auto}

.qtext{font-family:var(--display);font-size:1.5rem;font-weight:600;line-height:1.35;margin:8px 0 20px;color:var(--ink)}
.p2 .qtext{font-size:1.7rem}
.opts{display:grid;gap:12px}
.opts.two{grid-template-columns:1fr 1fr}
.opt{position:relative;display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--paper);border-radius:var(--r-btn);padding:16px 18px;font-size:1.12rem;font-weight:700;line-height:1.35;
  box-shadow:0 5px 0 #d9def0,inset 0 0 0 2px var(--line);transition:transform .12s var(--ease-out),box-shadow .12s var(--ease-out),background .2s}
.opt .k{width:34px;height:34px;border-radius:11px;display:grid;place-items:center;background:var(--soft);font-family:var(--display);font-weight:800;color:var(--ink2);flex:none;transition:background .2s,color .2s}
.opt:active{transform:translateY(4px);box-shadow:0 1px 0 #d9def0,inset 0 0 0 2px var(--line)}
.opt.pick{background:var(--cobalt-l);box-shadow:0 5px 0 #b9c4ff,inset 0 0 0 2px var(--cobalt)}.opt.pick .k{background:var(--cobalt);color:#fff}
.opt.ok{background:var(--mint-l);box-shadow:0 5px 0 #9fe3c9,inset 0 0 0 2px var(--mint);animation:pop .35s var(--spring)}.opt.ok .k{background:var(--mint);color:#fff}
.opt.bad{background:var(--red-l);box-shadow:0 5px 0 #ffc2c2,inset 0 0 0 2px var(--red);animation:shake .4s var(--ease-io)}.opt.bad .k{background:var(--red);color:#fff}
.opt.dim{opacity:.5}
.answerbox{display:flex;align-items:center;gap:10px;background:var(--soft);border-radius:var(--r-btn);padding:10px 16px;min-height:72px;box-shadow:inset 0 0 0 2px var(--line)}
.answerbox .val{flex:1;font-family:var(--display);font-size:2rem;font-weight:700;letter-spacing:.02em;min-height:1.3em}
.answerbox .val:empty::before{content:attr(data-ph);color:var(--ink3);font-size:1.15rem;font-weight:600;font-family:var(--body)}
.answerbox .caret{width:3px;height:1.9rem;background:var(--cobalt);border-radius:2px;animation:caret 1s steps(1) infinite}
@keyframes caret{50%{opacity:0}}
.answerbox .unit{font-family:var(--display);font-weight:700;color:var(--ink2);font-size:1.3rem}
.answerbox.ok{background:var(--mint-l);box-shadow:inset 0 0 0 2px var(--mint)}.answerbox.bad{background:var(--red-l);box-shadow:inset 0 0 0 2px var(--red);animation:shake .4s var(--ease-io)}
.keypad{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:14px}
.keypad button{height:62px;border-radius:16px;background:var(--paper);font-family:var(--display);font-size:1.6rem;font-weight:700;box-shadow:0 4px 0 #d9def0,inset 0 0 0 2px var(--line);transition:transform .1s var(--ease-out),box-shadow .1s}
.keypad button:active{transform:translateY(3px);box-shadow:0 1px 0 #d9def0,inset 0 0 0 2px var(--line)}
.keypad .fn{background:var(--soft);color:var(--ink2);font-size:1.3rem}
.keypad .kbd{font-family:var(--body);font-size:.86rem;font-weight:800}
.textans{width:100%;border:none;background:var(--soft);border-radius:var(--r-btn);padding:18px;font-size:1.25rem;font-weight:700;box-shadow:inset 0 0 0 2px var(--line);color:var(--ink)}
.textans:focus{outline:none;box-shadow:inset 0 0 0 3px var(--cobalt);background:#fff}
textarea.textans{min-height:130px;line-height:1.5;resize:vertical}
.helprow{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.helpbtn{display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:9px 14px;font-weight:800;font-size:.9rem;background:var(--sun-l);color:#8a5a00}
.helpbtn.alt{background:var(--grape-l);color:var(--grape)}
.hintbox{display:flex;gap:10px;align-items:flex-start;margin-top:12px;background:var(--sun-l);border-radius:16px;padding:12px 14px;line-height:1.55;animation:pop .3s var(--spring)}

/* feedback sheet slides up from the bottom */
.fbsheet{position:fixed;left:0;right:0;bottom:0;z-index:45;padding:20px 20px calc(20px + env(safe-area-inset-bottom));transform:translateY(105%);transition:transform .42s var(--spring)}
.fbsheet.show{transform:none}
.fbsheet .in{max-width:760px;margin:0 auto;display:flex;gap:16px;align-items:flex-start}
.fbsheet.ok{background:#dcf7ec;box-shadow:0 -2px 0 #9fe3c9}.fbsheet.bad{background:#ffe6e6;box-shadow:0 -2px 0 #ffbcbc}
.fbsheet .ic{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;font-size:2rem;color:#fff;flex:none}
.fbsheet.ok .ic{background:var(--mint)}.fbsheet.bad .ic{background:var(--red)}
.fbsheet h3{font-size:1.45rem}.fbsheet.ok h3{color:var(--mint-d)}.fbsheet.bad h3{color:var(--red-d)}
.fbsheet .why{margin-top:4px;line-height:1.55;color:#2a3155;font-weight:600;max-height:32vh;overflow:auto}
.fbsheet .model{margin-top:6px;font-weight:800}
.fbsheet .btn{margin-top:14px}
.fbsheet .body{flex:1;min-width:0}

/* worked examples */
.steps{position:relative;padding-left:4px}
.xstep{position:relative;display:flex;gap:14px;padding:12px 0 12px;animation:rise .4s var(--ease-out) both}
.xstep .n{width:38px;height:38px;border-radius:50%;background:var(--grape);color:#fff;font-family:var(--display);font-weight:800;display:grid;place-items:center;flex:none;box-shadow:0 4px 0 #5a35d6;position:relative;z-index:1}
.xstep:not(:last-child)::before{content:"";position:absolute;left:18px;top:50px;bottom:-12px;width:3px;border-radius:2px;background:var(--grape-l)}
.xstep .do{font-weight:800;font-size:1.08rem;line-height:1.5}.xstep .why{color:var(--ink2);margin-top:4px;line-height:1.55;font-weight:600}
.xans{display:flex;gap:10px;align-items:center;background:var(--mint-l);border-radius:18px;padding:14px 16px;margin-top:14px;font-family:var(--display);font-size:1.2rem;font-weight:700;color:var(--mint-d);animation:pop .4s var(--spring)}
.xtip{display:flex;gap:10px;background:var(--sun-l);border-radius:18px;padding:14px 16px;margin-top:10px;line-height:1.55}

/* celebration */
.celebrate{text-align:center;padding:30px 24px}
.celebrate svg.genie{margin:0 auto;width:150px;height:150px}
.celebrate h1{font-size:2.3rem;margin-top:6px}
.celebrate .earned{display:flex;justify-content:center;gap:12px;margin:18px 0 6px;flex-wrap:wrap}
.celebrate .earned .tile{min-width:150px;justify-content:center}
.bigstars{display:flex;justify-content:center;gap:6px;margin-top:10px}
.bigstars .ph{font-size:3rem;color:#dfe3f0;transition:color .3s}
.bigstars .ph.lit{color:var(--sun);animation:starpop .6s var(--spring) both}
@keyframes starpop{0%{transform:scale(.3) rotate(-30deg)}100%{transform:scale(1) rotate(0)}}

/* confetti */
.confetti{position:fixed;inset:0;pointer-events:none;z-index:60;overflow:hidden}
.confetti i{position:absolute;top:0;left:0;width:10px;height:14px;border-radius:3px}
.floatxp{position:fixed;z-index:61;pointer-events:none;font-family:var(--display);font-weight:800;font-size:1.5rem;color:var(--sun-d);text-shadow:0 2px 0 #fff}

/* widgets ("Play with it") */
.wgt{background:var(--paper);border-radius:var(--r-card);box-shadow:var(--clay);padding:20px}
.wgt h3{font-size:1.25rem;display:flex;align-items:center;gap:8px}.wgt .blurb{color:var(--ink2);margin:4px 0 12px}
.wrow{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:10px 0}
.wrow label{font-size:.82rem;font-weight:800;color:var(--ink3);display:flex;flex-direction:column;gap:4px}
.wrow input[type=number]{width:86px;border:none;background:var(--soft);box-shadow:inset 0 0 0 2px var(--line);border-radius:12px;padding:10px;font-size:1.1rem;font-weight:800}
.wout{background:var(--soft);border-radius:16px;padding:14px;margin-top:10px;line-height:1.6}
.fwrow{display:flex;align-items:center;gap:8px;margin-bottom:6px}.fwlab{width:40px;font-family:var(--display);font-weight:800;color:var(--ink2)}
.fwbar{flex:1;display:flex;height:34px;border-radius:10px;overflow:hidden;box-shadow:inset 0 0 0 2px var(--ink)}
.fwbar i{border-right:2px solid var(--ink);cursor:pointer;transition:background .15s}.fwbar i:last-child{border-right:none}

/* ask genie */
.fab{position:fixed;right:22px;bottom:calc(100px + env(safe-area-inset-bottom));z-index:31;display:flex;align-items:center;gap:8px;background:var(--grape);color:#fff;border-radius:999px;padding:12px 18px 12px 12px;font-family:var(--display);font-weight:700;font-size:1.05rem;box-shadow:0 6px 0 #5a35d6,0 18px 30px -12px rgba(121,80,242,.6)}
.fab:active{transform:translateY(4px);box-shadow:0 2px 0 #5a35d6}
.fab .ph{font-size:1.5rem}
.sheet{position:fixed;inset:0;background:rgba(27,33,64,.4);z-index:50;display:flex;align-items:flex-end;justify-content:center;animation:fade .2s ease both}
@keyframes fade{from{opacity:0}}
.sheet .inner{background:var(--paper);border-radius:30px 30px 0 0;width:100%;max-width:640px;padding:10px 20px calc(22px + env(safe-area-inset-bottom));max-height:86dvh;overflow-y:auto;animation:sheetup .42s var(--ease-drawer,cubic-bezier(.32,.72,0,1)) both}
@keyframes sheetup{from{transform:translateY(100%)}}
.sheet .grab{width:44px;height:5px;border-radius:3px;background:var(--line);margin:4px auto 14px}
.sheet h2{font-size:1.45rem}
.lvl{display:flex;gap:14px;align-items:center;width:100%;text-align:left;background:var(--soft);border-radius:20px;padding:14px;margin-top:10px;box-shadow:inset 0 0 0 2px transparent;transition:transform .14s var(--ease-out)}
.lvl:active{transform:scale(.985)}.lvl.on{background:var(--cobalt-l);box-shadow:inset 0 0 0 2px var(--cobalt)}
.lvl .lv{width:56px;height:56px;border-radius:18px;background:#fff;display:grid;place-items:center;font-family:var(--display);font-weight:800;font-size:1.2rem;flex:none;color:var(--cobalt)}
.lvl.on .lv{background:var(--cobalt);color:#fff}
.msgs{display:flex;flex-direction:column;gap:10px;min-height:120px;max-height:46dvh;overflow-y:auto;margin:10px 0 12px}
.msg{max-width:84%;overflow-wrap:anywhere;padding:11px 15px;border-radius:20px;line-height:1.5;animation:pop .25s var(--ease-out)}
.msg.kid{align-self:flex-end;background:var(--cobalt);color:#fff;border-bottom-right-radius:6px}
.msg.bot{align-self:flex-start;background:var(--soft);border-bottom-left-radius:6px}
.msg.typing{display:flex;gap:5px}.msg.typing i{width:8px;height:8px;border-radius:50%;background:var(--ink3);animation:dot 1s infinite}.msg.typing i:nth-child(2){animation-delay:.15s}.msg.typing i:nth-child(3){animation-delay:.3s}
@keyframes dot{50%{transform:translateY(-5px);opacity:.4}}
.askform{display:flex;gap:10px}.askform input{flex:1;border:none;background:var(--soft);box-shadow:inset 0 0 0 2px var(--line);border-radius:999px;padding:14px 18px;font-size:1.05rem;font-weight:700}
.askform input:focus{outline:none;box-shadow:inset 0 0 0 3px var(--grape)}
.askform button{width:54px;border-radius:50%;background:var(--grape);color:#fff;font-size:1.3rem;box-shadow:0 4px 0 #5a35d6}

/* plan */
.week{background:var(--paper);border-radius:20px;box-shadow:var(--clay);padding:14px 16px;margin-bottom:10px}
.week.current{box-shadow:var(--clay),inset 0 0 0 3px var(--cobalt)}.week.past{opacity:.66}
.week h4{font-size:1.1rem;display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}
.week .wi{display:flex;gap:10px;align-items:center;padding:9px 4px;border-top:2px solid var(--soft);width:100%;text-align:left}
.week .wi:first-of-type{border:none}

/* write */
.tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;padding:6px;background:#e4e8f4;border-radius:20px}
.tabs button{padding:12px;border-radius:15px;font-family:var(--display);font-weight:700;font-size:1.05rem;color:var(--ink2);transition:background .2s,color .2s}
.tabs button.on{background:var(--paper);color:var(--ink);box-shadow:var(--clay)}
.prompt{background:var(--paper);border-radius:var(--r-card);box-shadow:var(--clay);padding:16px;text-align:left;width:100%;transition:transform .16s var(--ease-out)}
.prompt:active{transform:scale(.985)}
.prompt h4{font-size:1.15rem}.prompt p{color:var(--ink2);margin-top:3px}
.promptgrid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.pics{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}.pics span{background:var(--soft);border-radius:12px;padding:10px 12px;font-size:.86rem;flex:1;min-width:120px;text-align:center}
.pimg{width:100%;border-radius:16px;margin-top:10px;display:block}
.guide details{background:var(--paper);border-radius:18px;box-shadow:var(--clay);padding:14px 18px;margin-bottom:10px}
.guide summary{font-family:var(--display);font-weight:700;font-size:1.08rem;cursor:pointer;list-style:none;display:flex;align-items:center;gap:8px}
.guide summary::-webkit-details-marker{display:none}.guide p{margin-top:8px;line-height:1.6}
.photos{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}.photos img{width:92px;height:92px;object-fit:cover;border-radius:16px;box-shadow:var(--clay)}
textarea{width:100%;border:none;background:var(--soft);box-shadow:inset 0 0 0 2px var(--line);border-radius:18px;padding:14px;font-size:1.05rem;min-height:140px;line-height:1.55}
textarea:focus{outline:none;box-shadow:inset 0 0 0 3px var(--cobalt);background:#fff}
.score{display:grid;grid-template-columns:auto 1fr auto;gap:20px;align-items:center;border-radius:28px;padding:22px;color:#fff;background:radial-gradient(120% 140% at 0% 0%,#6a84ff,#4361ee 55%,#3346c9);box-shadow:var(--clay-lg)}
.score .ring{position:relative;width:110px;height:110px}.score .ring svg{transform:rotate(-90deg)}
.score .ring b{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--display);font-size:2rem;line-height:1}
.score .ring b small{display:block;font-size:.9rem;opacity:.8;text-align:center}
.score h2{font-size:1.5rem}.score .parts{text-align:right;font-weight:800}.score .parts b{display:block;font-family:var(--display);font-size:1.6rem}
.fb{background:var(--paper);border-radius:var(--r-card);box-shadow:var(--clay);padding:18px 20px}
.fb h3{font-size:1.2rem;margin-bottom:10px;display:flex;align-items:center;gap:8px}
.fb ul{padding-left:20px;line-height:1.65}
.imp{border-radius:16px;background:var(--coral-l);padding:12px 14px;margin-bottom:10px;line-height:1.55}.imp q{font-style:italic;color:var(--ink2)}.imp .better{color:var(--mint-d);font-weight:800;margin-top:4px}
.corr{display:grid;grid-template-columns:1fr auto 1fr;gap:8px 10px;align-items:center}.corr .from{text-decoration:line-through;color:var(--red)}.corr .to{color:var(--mint-d);font-weight:800}
.transcript{white-space:pre-wrap;line-height:1.65;background:var(--soft);border-radius:16px;padding:14px;max-height:300px;overflow-y:auto}
.loading{text-align:center;padding:50px 20px}.loading svg.genie{margin:0 auto}
.warn{display:flex;gap:10px;background:var(--sun-l);border-radius:16px;padding:12px 16px;color:#7a5200;line-height:1.5}
#toast{position:fixed;left:50%;bottom:calc(104px + env(safe-area-inset-bottom));transform:translate(-50%,20px);background:var(--ink);color:#fff;border-radius:999px;padding:12px 22px;font-weight:800;z-index:70;opacity:0;transition:opacity .25s,transform .35s var(--spring);pointer-events:none}
#toast.show{opacity:1;transform:translate(-50%,0)}
.empty{text-align:center;padding:26px 20px;color:var(--ink2)}.empty .ph{font-size:2.4rem;color:var(--ink3)}

/* skeleton while a view loads */
.skel{border-radius:var(--r-card);background:linear-gradient(90deg,#e8ebf5 0%,#f4f6fc 50%,#e8ebf5 100%);background-size:200% 100%;animation:shimmer 1.2s linear infinite}
@keyframes shimmer{to{background-position:-200% 0}}

/* ---------- responsive ---------- */
@media (max-width:820px){.subjgrid{grid-template-columns:1fr 1fr}.tiers{grid-template-columns:1fr}.promptgrid{grid-template-columns:1fr}}
@media (max-width:560px){
  .wrap{padding:10px 14px calc(110px + env(safe-area-inset-bottom))}
  .hero{grid-template-columns:1fr;padding:22px}.hero svg.genie{position:absolute;right:6px;top:8px;width:96px;height:96px}
  .hero h1{font-size:1.7rem;padding-right:80px}
  .statsrow{grid-template-columns:1fr 1fr}.statsrow .tile:last-child{grid-column:span 2}
  nav.bottom button{min-width:58px;padding:8px 6px}
  .stat.hide-sm{display:none}.who span{display:none}
  .opts.two{grid-template-columns:1fr}.qtext{font-size:1.3rem}
  .score{grid-template-columns:auto 1fr}.score .parts{grid-column:span 2;text-align:left;display:flex;gap:20px}
}
@media (hover:hover) and (pointer:fine){
  .subj:hover,.row:hover,.lrow:hover,.tier:hover,.prompt:hover{transform:translateY(-2px)}
  .opt:hover{background:#f8f9ff}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}

/* while a lesson or quiz is playing, the tab bar steps aside */
nav.bottom{transition:transform .4s var(--spring),opacity .25s}
.playing nav.bottom{transform:translate(-50%,170%);opacity:0;pointer-events:none}
.playing .wrap{padding-bottom:calc(60px + env(safe-area-inset-bottom))}
.playing .fab{bottom:calc(22px + env(safe-area-inset-bottom))}
.stage .iconbtn{width:44px;height:44px}
.celebrate .actionbar .btn{flex:0 1 auto;min-width:180px}
/* the ring label must beat the generic ".tile b" rule */
.tile .goalring b{position:absolute;inset:0;display:grid;place-items:center;font-size:.95rem;line-height:1}
.phead .fab{position:static;padding:10px 14px 10px 10px;font-size:.98rem;box-shadow:0 4px 0 #5a35d6;flex:none}
.phead .fab:active{transform:translateY(3px);box-shadow:0 1px 0 #5a35d6}
@media (max-width:560px){.phead .fab span{display:none}.phead .fab{padding:10px}}
/* player is a focus mode: the app header steps away and the player bar sticks to the top */
.playing header.top{display:none}
.playing .phead{position:sticky;top:0;z-index:30;margin:0 0 12px;padding:calc(10px + env(safe-area-inset-top)) 0 12px;background:linear-gradient(var(--ground) 78%,rgba(243,245,251,0))}
/* touch targets: every tappable thing is at least 44px tall for small fingers */
#lvlChip,.back,.link,.helpbtn{min-height:44px}
.link{display:inline-flex;align-items:center;gap:6px;padding:8px 6px}
.week .wi{min-height:48px}
.vis .replay{width:44px;height:44px}