/*! ArxDa Science — © 2026 ArxDa. All rights reserved. Unauthorized copying, modification, hosting or distribution of this file is prohibited. */
/* The "sticker lab notebook" look: graph paper, bold navy ink outlines, flat bright fills and solid offset shadows. */

/* ---------- fonts (self-hosted; SIL Open Font License 1.1, see assets/fonts/OFL-*.txt) ---------- */
@font-face{font-family:'Fredoka';font-style:normal;font-weight:400 700;font-display:swap;src:url(../fonts/fredoka-latin.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:'Nunito';font-style:normal;font-weight:400 900;font-display:swap;src:url(../fonts/nunito-latin.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  --paper:#EEF8F6;--ink:#1B2A4A;--ink2:#3A4A6B;--mute:#687793;--soft:#D3E5E8;--soft2:#E7F2F3;--card:#fff;
  --brand:#14B8A6;--brand-d:#0E9384;--brand-l:#D6F6F0;
  --lime:#A3E635;--lime-d:#6EA417;--sun:#FFD43B;--sun-d:#D9A400;--sun-l:#FFF6CC;
  --green:#34C759;--green-d:#1E9A43;--green-l:#E2F9E8;
  --red:#FF5D6C;--red-d:#D63A4A;--red-l:#FFE7EA;
  --gold:#FFC21A;--gold-d:#B47C00;--gold-l:#FFF4D1;
  --orange:#FF8A3D;--blue:#3B82F6;--pink:#FF6FB5;--violet:#8B5CF6;
  --ol:2.5px solid var(--ink);--sh:0 4px 0 var(--ink);
  --r:18px;--display:'Fredoka','Nunito',system-ui,sans-serif;--body:'Nunito',system-ui,-apple-system,'Segoe UI',sans-serif;
  --robot:ui-monospace,'Cascadia Mono','Consolas','Courier New',monospace;
  --grid:linear-gradient(rgba(20,184,166,.10) 1px,transparent 1px),linear-gradient(90deg,rgba(20,184,166,.10) 1px,transparent 1px),linear-gradient(rgba(20,184,166,.17) 1.5px,transparent 1.5px),linear-gradient(90deg,rgba(20,184,166,.17) 1.5px,transparent 1.5px);
  --tab-h:66px;color-scheme:light;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;background:var(--paper)}
body{margin:0;min-height:100vh;color:var(--ink);font:600 16px/1.5 var(--body);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;overflow-x:hidden;
  background-color:var(--paper);background-image:var(--grid);background-size:24px 24px,24px 24px,120px 120px,120px 120px}
button{font:inherit;color:inherit}
img,svg{display:block;max-width:100%}
h1,h2,h3{font-family:var(--display);font-weight:600;line-height:1.15;margin:0}
p{margin:0}
a{color:var(--brand-d)}
[hidden]{display:none!important}
.ic{width:1.25em;height:1.25em;flex:none}
.ic.gold{color:var(--gold)}.ic.fire{color:var(--orange)}.ic.sparky{color:#F2A007}
.muted{color:var(--mute)}.center{text-align:center}.small{font-size:14px}
.skip{position:absolute;left:12px;top:-60px;z-index:200;background:var(--sun);color:var(--ink);font-weight:800;padding:10px 16px;border:var(--ol);border-radius:12px;text-decoration:none}
.skip:focus{top:12px}
:focus-visible{outline:3px solid var(--violet);outline-offset:3px}
.link{background:none;border:0;padding:0;color:var(--brand-d);font-weight:800;cursor:pointer;text-decoration:underline;text-underline-offset:3px}

/* ---------- buttons: stickers with an ink outline and a solid shadow ---------- */
.btn{--b:var(--brand);--fg:#fff;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:0 24px;border:var(--ol);border-radius:16px;background:var(--b);color:var(--fg);
  font:600 18px/1 var(--display);letter-spacing:.02em;white-space:nowrap;cursor:pointer;box-shadow:var(--sh);transition:transform .08s,box-shadow .08s,filter .2s;text-decoration:none;touch-action:manipulation;user-select:none;-webkit-user-select:none;
  text-shadow:0 2px 0 rgba(27,42,74,.28)}
.btn:hover{filter:brightness(1.05)}
.btn:active{transform:translateY(3px);box-shadow:0 1px 0 var(--ink)}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}
.btn small{font-family:var(--body);font-weight:800;font-size:13px;opacity:.9}
.btn .ic{width:20px;height:20px}
.btn.green{--b:var(--green)}
.btn.red{--b:var(--red)}
.btn.sun{--b:var(--sun);--fg:var(--ink);text-shadow:none}
.btn.white,.btn.ghost{--b:#fff;--fg:var(--ink);text-shadow:none}
.btn.white{color:var(--ink)}
.btn.small{min-height:42px;padding:0 15px;font-size:15px;border-radius:13px;border-width:2px;box-shadow:0 3px 0 var(--ink)}
.btn.small:active{box-shadow:0 1px 0 var(--ink)}
.icon-btn{width:44px;height:44px;border:var(--ol);border-radius:13px;background:#fff;color:var(--ink);display:grid;place-items:center;cursor:pointer;box-shadow:0 3px 0 var(--ink)}
.icon-btn:active{transform:translateY(2px);box-shadow:0 1px 0 var(--ink)}
.icon-btn .ic{width:24px;height:24px}
.card{background:var(--card);border:var(--ol);border-radius:var(--r);padding:18px;box-shadow:4px 4px 0 var(--ink)}
.h2{font-size:22px;margin:26px 4px 12px;display:flex;align-items:center;gap:8px}
.h2>.ic{width:26px;height:26px;color:var(--brand-d)}
.h2 small{font:800 14px var(--body);color:var(--mute)}

/* ---------- splash ---------- */
#splash{position:fixed;inset:0;z-index:300;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;text-align:center;
  background-color:#0FA596;background-image:linear-gradient(rgba(255,255,255,.10) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.10) 1px,transparent 1px),radial-gradient(circle at 50% 38%,#2DD4BF 0%,#14B8A6 45%,#0B7F73 100%);
  background-size:28px 28px,28px 28px,auto;transition:opacity .5s,visibility .5s}
#splash.hide{opacity:0;visibility:hidden}
.sp-inner{display:flex;flex-direction:column;align-items:center;padding:0 24px}
.sp-logo{width:128px;height:128px;border:4px solid var(--ink);border-radius:32px;box-shadow:6px 6px 0 var(--ink);animation:bob 2.2s ease-in-out infinite}
.sp-title{font:700 clamp(40px,10vw,64px)/1.1 var(--display);margin-top:22px;letter-spacing:.01em;color:#fff;-webkit-text-stroke:3px var(--ink);paint-order:stroke fill;text-shadow:0 5px 0 var(--ink)}
.sp-sub{font-weight:800;margin-top:6px;color:var(--ink);background:var(--lime);padding:3px 12px;border:2px solid var(--ink);border-radius:99px}
.sp-bar{width:min(260px,70vw);height:18px;border:var(--ol);border-radius:99px;background:#fff;margin:26px 0 10px;overflow:hidden}
.sp-fill{width:0;height:100%;background:repeating-linear-gradient(-45deg,var(--lime) 0 10px,#C3F26E 10px 20px);border-right:2.5px solid var(--ink);transition:width .4s}
.sp-msg{font-weight:800;font-size:15px}
.sp-tip{font-weight:700;font-size:14px;opacity:.92;margin-top:8px;max-width:340px}
.sp-copy{position:absolute;bottom:max(16px,env(safe-area-inset-bottom));font-size:12px;font-weight:800;opacity:.85}

/* ---------- app layout ---------- */
.app{min-height:100vh}
.sidebar,.rail{display:none}
.col{min-width:0}
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:6px;padding:9px max(10px,env(safe-area-inset-left)) 9px max(10px,env(safe-area-inset-right));
  background:rgba(255,255,255,.94);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:var(--ol)}
main{outline:none;padding-bottom:calc(var(--tab-h) + env(safe-area-inset-bottom) + 34px)}
.view{max-width:640px;margin:0 auto;padding:18px 16px}
.chip{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:3px 10px;border:2px solid var(--ink);border-radius:13px;background:#fff;cursor:pointer;font:600 17px var(--display);color:var(--ink);box-shadow:0 3px 0 var(--ink)}
.chip:hover{background:var(--soft2)}
.chip:active{transform:translateY(2px);box-shadow:0 1px 0 var(--ink)}
.chip b{font-weight:600}
.chip small{font-size:12px;color:var(--mute);font-family:var(--body);font-weight:800}
.chip .league-badge{width:26px;height:28px}
.chip-league span{font-size:15px}
.chip-streak .ic{width:24px;height:24px;color:#B9C6CF}
.chip-streak.on{background:var(--sun-l)}
.chip-streak.on .ic{color:#F2A007}
.chip-coins .ic{width:22px;height:22px;color:var(--gold)}
.chip-goal .ring{width:28px;height:28px}
.tabbar{position:fixed;left:10px;right:10px;bottom:calc(10px + env(safe-area-inset-bottom));z-index:40;display:flex;justify-content:space-around;gap:4px;height:var(--tab-h);padding:6px;
  border:var(--ol);border-radius:22px;background:#fff;box-shadow:0 5px 0 var(--ink)}
.tabbar button{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;border:2px solid transparent;background:transparent;border-radius:14px;color:var(--mute);font:800 12px var(--body);cursor:pointer;max-width:110px;min-width:0}
.tabbar button .ic{width:26px;height:26px}
.tabbar button.on{color:#fff;background:var(--brand);border-color:var(--ink);box-shadow:0 3px 0 var(--ink)}
.tabbar button.on span{text-shadow:0 1px 0 rgba(27,42,74,.4)}
body.in-lesson .tabbar,body.in-result .tabbar{display:none}

@media (min-width:760px){
  .app{display:grid;grid-template-columns:230px minmax(0,1fr)}
  .tabbar{display:none}
  main{padding-bottom:40px}
  .sidebar{display:flex;flex-direction:column;gap:8px;position:sticky;top:0;height:100vh;padding:18px 14px;background-color:var(--ink);
    background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:24px 24px}
  .sidebar .logo{display:flex;align-items:center;gap:10px;padding:4px 8px 20px;font:700 22px/1.05 var(--display);color:#fff}
  .sidebar .logo b{display:block;font-weight:700;color:var(--lime)}
  .sidebar .logo img{border:2.5px solid #fff;border-radius:12px}
  .sidebar button{display:flex;align-items:center;gap:14px;min-height:52px;padding:0 14px;border:2.5px solid transparent;border-radius:14px;background:transparent;color:#C9DCE3;font:600 17px var(--display);letter-spacing:.04em;text-transform:uppercase;cursor:pointer}
  .sidebar button .ic{width:28px;height:28px}
  .sidebar button:hover{background:rgba(255,255,255,.08);color:#fff}
  .sidebar button.on{color:var(--ink);background:var(--lime);border-color:#fff;box-shadow:0 4px 0 #0B1428}
  .topbar{justify-content:flex-end;gap:10px;padding:11px 22px;background:rgba(238,248,246,.9)}
}
@media (min-width:1180px){
  .app{grid-template-columns:240px minmax(0,1fr) 330px}
  .rail{display:flex;flex-direction:column;gap:16px;position:sticky;top:0;height:100vh;overflow:auto;padding:78px 20px 20px 4px}
}
.rail-card h3{display:flex;align-items:center;gap:8px;font-size:18px;margin-bottom:10px}
.rail-card h3 .league-badge{width:30px;height:32px}
.rail-card h3 .ic{width:24px;height:24px;color:var(--brand-d)}
.rail-card p{color:var(--ink2);margin-bottom:12px}
.rq{margin-bottom:12px}
.rq span{font-weight:800;font-size:14px}
.rq.done span{color:var(--green-d)}

/* ---------- the adventure map ---------- */
#view-learn{max-width:600px;padding:0 0 30px}
.map{position:relative}
.wbanner{position:relative;overflow:hidden;aspect-ratio:400/230;background:var(--g1,#D8F5A2);border-bottom:var(--ol)}
.wb-art,.wb-art svg{position:absolute;inset:0;width:100%;height:100%}
.wb-title{position:absolute;left:12px;right:12px;bottom:12px;display:flex;align-items:center;gap:12px;padding:9px 14px;border:var(--ol);border-radius:16px;background:#fff;box-shadow:4px 4px 0 var(--ink);max-width:330px}
.wb-title .league-badge{width:46px;height:50px;flex:none}
.wb-title small{display:block;font:800 11px var(--body);letter-spacing:.08em;text-transform:uppercase;color:var(--mute)}
.wb-title h2{font-size:23px;color:var(--ink)}
.wb-title span{font-weight:800;font-size:13px;color:var(--ink2)}
.wbanner.locked .wb-art{filter:grayscale(.6) brightness(1.05)}
.unit{position:relative;overflow:hidden;aspect-ratio:400/680;background-color:var(--g1,#EAF7F5);background-image:var(--grid),linear-gradient(var(--g1,#EAF7F5),var(--g2,#D9F0EC));background-size:24px 24px,24px 24px,120px 120px,120px 120px,auto}
.unit .scene{position:absolute;inset:0;width:100%;height:100%}
.unit.locked .scene{filter:saturate(.75)}
/* the unit sign: a notebook label taped onto the map */
.sign{position:absolute;top:1.6%;left:50%;z-index:2;transform:translateX(-50%) rotate(-1deg);width:min(82%,340px);padding:10px 14px 11px;border:3px solid var(--ink);border-radius:12px;text-align:center;color:var(--ink);
  background:#fff;box-shadow:5px 5px 0 var(--ink)}
.unit:nth-of-type(even) .sign{transform:translateX(-50%) rotate(1deg)}
.sign::before,.sign::after{content:"";position:absolute;top:-11px;width:54px;height:20px;border:2px solid rgba(27,42,74,.25);background:rgba(255,212,59,.82);border-radius:3px}
.sign::before{left:12px;transform:rotate(-8deg)}.sign::after{right:12px;transform:rotate(7deg)}
.sign small{display:inline-block;margin-bottom:3px;padding:1px 10px;border:2px solid var(--ink);border-radius:99px;font:800 11px var(--body);letter-spacing:.1em;text-transform:uppercase;background:var(--br,#D6F6F0)}
.sign.br-bio{--br:#D9F7B5}.sign.br-chem{--br:#EBDDFF}.sign.br-phys{--br:#D3E7FF}.sign.br-mix{--br:#FFE98A}
.sign h2{display:flex;align-items:center;justify-content:center;gap:8px;font-size:22px}
.sg-ic{font-size:24px;line-height:1}
.sign p{font-weight:700;font-size:13px;color:var(--ink2)}
.unit.locked .sign{color:#5F6C84;background:#F1F4F7}
.unit.locked .sign small{background:#E1E7EE}
.sign .jump{position:absolute;left:50%;top:calc(100% + 10px);translate:-50% 0;gap:6px;white-space:nowrap;text-shadow:none;background:var(--sun)}
.sign .jump .ic{width:18px;height:18px}
.stop-wrap{position:absolute;z-index:3;width:21%;transform:translate(-50%,-50%)}
.stop-wrap.boss{width:29%}
.stop-wrap.popped{z-index:30}
.stop-btn{position:relative;display:block;width:100%;padding:0;border:0;background:none;cursor:pointer;transition:transform .12s;-webkit-tap-highlight-color:transparent}
.stop-btn .stop{display:block;width:100%;height:auto}
.stop-btn:hover{transform:translateY(-2px)}
.stop-btn:active{transform:scale(.93)}
.stop-ic{position:absolute;left:50%;top:44%;display:grid;place-items:center;width:40%;aspect-ratio:1;border:2.5px solid var(--ink);border-radius:50%;transform:translate(-50%,-50%);
  background:#fff;color:var(--ink);font:700 clamp(15px,4.4vw,22px) var(--display);box-shadow:0 3px 0 var(--ink)}
.stop-ic .ic{width:56%;height:56%}
.stop-btn.locked .stop-ic{color:#8D9AB0;background:#E8EDF2;border-color:#8D9AB0;box-shadow:none}
.stop-btn.done .stop-ic{background:var(--sun);color:var(--ink)}
.stop-btn.current .stop-ic{background:var(--wa,var(--brand));color:#fff;text-shadow:0 2px 0 rgba(27,42,74,.35);animation:ring 1.8s ease-out infinite}
.boss .stop-ic{width:24%;top:65%;border:0;background:transparent!important;box-shadow:none;color:var(--sun);filter:drop-shadow(0 2px 0 var(--ink))}
.boss .stop-btn .stop-ic{color:var(--sun);text-shadow:none}
.boss .stop-btn.locked .stop-ic{color:#B9C4D2}
.boss .stop-btn.current .stop-ic{animation:wobble 1.6s ease-in-out infinite}
.boss .stop-ic .ic{width:100%;height:100%}
.stop-stars{position:absolute;left:50%;top:86%;display:flex;gap:1px;padding:1px 6px;border:2px solid var(--ink);border-radius:99px;transform:translateX(-50%);background:#fff;pointer-events:none}
.stop-stars i{color:#D0D9E2}.stop-stars i.on{color:var(--gold)}
.stop-stars .ic{width:14px;height:14px}
.stop-buddy{position:absolute;bottom:58%;left:70%;width:80%;pointer-events:none;animation:bob 2.4s ease-in-out infinite}
.stop-buddy.left{left:auto;right:70%}
.boss .stop-buddy{width:58%;bottom:70%}
.go-bubble{position:absolute;bottom:98%;left:50%;padding:5px 12px;border:2px solid var(--ink);border-radius:12px;transform:translateX(-50%);background:#fff;color:var(--ink);font:700 14px var(--display);white-space:nowrap;box-shadow:0 3px 0 var(--ink)}
.go-bubble::after{content:"";position:absolute;left:50%;top:100%;width:10px;height:10px;margin-top:-5px;border-right:2px solid var(--ink);border-bottom:2px solid var(--ink);background:#fff;transform:translateX(-50%) rotate(45deg)}
.pop{--dx:0px;position:absolute;top:calc(100% + 16px);left:50%;z-index:40;width:min(290px,86vw);padding:15px 16px 16px;border:3px solid var(--ink);border-radius:18px;background:var(--wa,var(--brand));color:#fff;text-align:left;
  transform:translateX(calc(-50% + var(--dx)));box-shadow:5px 5px 0 var(--ink);animation:popIn .2s ease-out}
.pop::before{content:"";position:absolute;bottom:100%;left:calc(50% - var(--dx));width:18px;height:18px;margin-bottom:-9px;border-left:3px solid var(--ink);border-top:3px solid var(--ink);background:var(--wa,var(--brand));transform:translateX(-50%) rotate(45deg)}
.pop b{display:block;font:600 21px var(--display);text-shadow:0 2px 0 rgba(27,42,74,.35)}
.pop span{display:block;margin-bottom:12px;font-weight:800;text-shadow:0 1px 0 rgba(27,42,74,.3)}
.pop .btn{width:100%}
.pop em{display:block;font-style:normal;font-weight:800}
.pop.locked{background:#fff;color:var(--ink)}
.pop.locked b,.pop.locked span{text-shadow:none}
.pop.locked::before{background:#fff}
.pop{scroll-margin:80px 0 calc(var(--tab-h) + 40px)}
.pop.up{top:auto;bottom:calc(100% + 16px)}
.pop.up::before{bottom:auto;top:100%;margin:-9px 0 0;border:0;border-right:3px solid var(--ink);border-bottom:3px solid var(--ink)}
.pop-foe{float:right;width:74px;margin:-36px -6px 0 6px}
.map-end{display:flex;flex-direction:column;align-items:center;gap:8px;padding:30px 20px;color:var(--ink2);font-weight:800;text-align:center}
.map-end .buddy{width:120px}
@media (min-width:760px){
  #view-learn{padding-top:20px}
  .wbanner{border:var(--ol);border-radius:24px 24px 0 0;margin-top:26px}
  .wbanner:first-child{margin-top:0}
  .unit{border-left:var(--ol);border-right:var(--ol)}
  .unit:last-of-type{border-bottom:var(--ol);border-radius:0 0 24px 24px}
  .map{filter:drop-shadow(5px 5px 0 var(--ink))}
}

/* ---------- lessons and Glitch Bot battles ---------- */
.lesson{position:fixed;inset:0;z-index:60;display:flex;flex-direction:column;overflow:auto;overflow-x:hidden;background-color:var(--s2,#F4FBFA);
  background-image:var(--grid),linear-gradient(var(--s1,#D8F5A2),var(--s2,#F4FBFA));background-size:24px 24px,24px 24px,120px 120px,120px 120px,auto}
.ls-bg{position:fixed;inset:0;z-index:0;pointer-events:none}
.ls-bg svg{width:100%;height:100%}
.ls-top,.ls-stage,.ls-answer{position:relative;z-index:1}
.ls-top{display:flex;align-items:center;gap:12px;width:100%;max-width:820px;margin:0 auto;padding:max(12px,env(safe-area-inset-top)) 16px 4px}
.ls-track{position:relative;flex:1;height:40px}
.trk-line{position:absolute;left:4px;right:30px;top:50%;height:18px;margin-top:-9px;border:var(--ol);border-radius:99px;background:#fff;overflow:hidden}
.trk-line i{display:block;width:0;height:100%;background:repeating-linear-gradient(-45deg,#2DD4BF 0 8px,var(--brand) 8px 16px);border-right:2px solid var(--ink);transition:width .45s cubic-bezier(.2,.8,.2,1)}
.trk-runner{position:absolute;top:50%;left:0;width:40px;margin-left:4px;transform:translate(-50%,-66%);transition:left .45s cubic-bezier(.2,.8,.2,1)}
.trk-goal{position:absolute;right:0;top:50%;display:grid;place-items:center;width:36px;height:36px;border:var(--ol);border-radius:12px;transform:translateY(-50%);background:var(--sun);color:var(--ink);box-shadow:0 3px 0 var(--ink)}
.trk-goal .ic{width:22px;height:22px}
.ls-meta{display:flex;align-items:center;gap:2px;min-width:44px;justify-content:flex-end;font:700 20px var(--display);color:var(--ink)}
.ls-meta .heart{color:var(--red);transition:transform .3s,color .3s;filter:drop-shadow(0 2px 0 var(--ink))}
.ls-meta .heart .ic{width:30px;height:30px}
.ls-meta .heart.lost{color:#fff;opacity:.7;transform:scale(.78)}
.ls-meta .combo{display:flex;align-items:center;gap:2px;padding:2px 10px;border:2px solid var(--ink);border-radius:99px;background:var(--sun);box-shadow:0 2px 0 var(--ink);animation:popIn .3s}
.ls-meta .combo .ic{width:20px;height:20px;color:var(--ink)}
.lesson.boss .ls-top{justify-content:space-between}
.ls-stage{flex:1;display:grid;grid-template-columns:170px minmax(0,1fr) 170px;grid-template-areas:"hero board foe";align-items:center;gap:16px;width:100%;max-width:1040px;margin:0 auto;padding:10px 16px}
.lesson:not(.boss) .ls-stage{grid-template-columns:170px minmax(0,1fr) 60px}
@media (min-width:701px){
  /* wide screens: the board and the answers stay together in the middle of the screen */
  .lesson .ls-stage{flex:0 0 auto;margin-top:auto;padding-top:24px}
  .lesson .ls-answer{margin-bottom:auto;padding-top:18px}
}
.ls-hero{position:relative;grid-area:hero;align-self:end}
.hero-art{animation:bob 2.6s ease-in-out infinite}
.bubble{position:absolute;bottom:calc(100% + 14px);left:-10px;z-index:3;width:max-content;max-width:190px;margin:0;padding:9px 13px;border:var(--ol);border-radius:14px;background:#fff;color:var(--ink);
  font:600 17px/1.25 var(--display);text-align:left;box-shadow:0 4px 0 var(--ink);transform-origin:30px 100%}
.bubble::after{content:"";position:absolute;top:100%;left:34px;width:14px;height:14px;margin-top:-6px;border-right:2.5px solid var(--ink);border-bottom:2.5px solid var(--ink);background:inherit;transform:rotate(45deg)}
.bubble.in{animation:popIn .28s cubic-bezier(.2,1.4,.4,1)}
/* the Glitch Bot talks like a little computer screen */
.ls-foe .bubble{left:auto;right:-10px;background:var(--ink);color:var(--lime);font:700 15px/1.3 var(--robot);border-color:var(--ink);box-shadow:inset 0 0 0 2px rgba(163,230,53,.55),0 4px 0 rgba(27,42,74,.45);transform-origin:calc(100% - 30px) 100%}
.ls-foe .bubble::after{left:auto;right:34px}
.ls-board{grid-area:board;position:relative;min-width:0;padding:14px 16px 18px;border:3px solid var(--ink);border-radius:24px;background:#fff;text-align:center;box-shadow:6px 6px 0 var(--ink);transition:background .2s,box-shadow .2s}
.ls-board.in .ls-q,.ls-board.in .ls-e,.ls-board.in .ls-item{animation:qIn .32s cubic-bezier(.2,.9,.3,1.2)}
.ls-board.good{background:#F0FFF3;box-shadow:0 0 0 5px var(--green),6px 6px 0 5px var(--ink)}
.ls-board.bad{background:#FFF4F5;box-shadow:0 0 0 5px var(--red),6px 6px 0 5px var(--ink);animation:shake .45s}
.ls-head{display:flex;align-items:center;justify-content:center;gap:10px;min-height:36px;margin-bottom:6px;padding:0 44px}
.ls-say{display:flex;align-items:center;gap:6px;padding:3px 12px;border:2px solid var(--ink);border-radius:99px;background:#D6F6F0;background:color-mix(in srgb,var(--wa,#14B8A6) 32%,#fff);color:var(--ink);font:600 16px var(--display);line-height:1.2}
.ls-say .rev{font:800 11px var(--body);font-style:normal;letter-spacing:.08em;text-transform:uppercase;padding:1px 7px;border:1.5px solid var(--ink);border-radius:99px;background:var(--sun);color:var(--ink)}
.read-btn{display:grid;place-items:center;width:44px;height:44px;flex:none;padding:0;border:var(--ol);border-radius:50%;background:var(--sun);color:var(--ink);cursor:pointer;box-shadow:0 3px 0 var(--ink);touch-action:manipulation}
.read-btn:active{transform:translateY(2px);box-shadow:0 1px 0 var(--ink)}
.read-btn .ic{width:24px;height:24px}
.read-btn.talking{background:var(--lime);animation:talk .9s ease-in-out infinite}
.ls-head .read-btn{position:absolute;right:10px;top:10px}
.lesson .ls-board.good .ls-head .read-btn{visibility:hidden}
.ls-e{margin:2px 0 4px;font-size:clamp(38px,min(11vw,7.5vh),68px);line-height:1.12;letter-spacing:.06em}
.ls-q{margin:0 auto;max-width:34ch;font:600 var(--qs,28px)/1.25 var(--display);color:var(--ink);overflow-wrap:anywhere;hyphens:auto}
.ls-q.sz1{--qs:clamp(23px,min(6.6vw,4.6vh),38px);max-width:22ch}
.ls-q.sz2{--qs:clamp(20px,min(5.6vw,3.9vh),32px);max-width:28ch}
.ls-q.sz3{--qs:clamp(17px,min(4.8vw,3.3vh),27px);max-width:36ch}
.blank{display:inline-flex;align-items:flex-end;justify-content:center;min-width:3.4em;height:1.15em;margin:0 .12em;padding:0 .3em;vertical-align:-.12em;border:2.5px dashed var(--ink);border-radius:10px;background:var(--sun-l);color:var(--ink)}
.blank i{display:block;width:1.6em;height:.18em;margin-bottom:.12em;border-radius:9px;background:var(--sun);animation:blinkBar 1.2s ease-in-out infinite}
.blank.filled{border-style:solid;background:var(--green);color:#fff;text-shadow:0 1px 0 rgba(27,42,74,.4);animation:popIn .3s}
.ls-item{margin-top:10px}
.specimen{display:inline-flex;flex-direction:column;align-items:center;gap:2px;min-width:150px;max-width:100%;padding:10px 18px 12px;border:3px dashed var(--ink);border-radius:20px;background:repeating-linear-gradient(0deg,#F7FCFF 0 22px,#E9F4FA 22px 23px)}
.specimen .ce{font-size:clamp(46px,min(13vw,9vh),78px);line-height:1.1}
.specimen .ct{font:600 clamp(19px,5.2vw,26px)/1.2 var(--display)}
.ls-ok{position:absolute;right:-10px;top:-20px;z-index:3}
.ls-ok .btn{box-shadow:0 3px 0 var(--ink);animation:popIn .25s}
.ls-ok .btn .ic{width:16px;height:16px}
.ls-foe{position:relative;grid-area:foe;display:flex;flex-direction:column;align-items:center;gap:6px;align-self:end}
.foe-art{width:100%;animation:bob 2s ease-in-out infinite reverse}
.foe-art svg{display:block;width:100%;height:auto}
.ls-foe.hit .foe-art{animation:foeHit .5s ease-out}
.foe-hp{position:relative;width:100%;max-width:130px;height:20px;overflow:hidden;border:var(--ol);border-radius:99px;background:#fff}
.foe-hp i{display:block;width:100%;height:100%;background:repeating-linear-gradient(-45deg,#FF7A85 0 8px,var(--red) 8px 16px);transition:width .4s}
.foe-hp b{position:absolute;inset:0;display:grid;place-items:center;font:700 12px var(--display);color:var(--ink);text-shadow:0 0 3px #fff,0 0 3px #fff}
/* answers */
.ls-answer{width:100%;max-width:560px;margin:0 auto;padding:12px 16px calc(20px + env(safe-area-inset-bottom))}
.ls-answer.choices,.ls-answer.tf,.ls-answer.sort{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.ls-answer.choices.long{grid-template-columns:1fr;gap:10px}
.choice,.bin{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-width:0;min-height:80px;padding:10px 12px 12px;border:var(--ol);border-radius:18px;background:#fff;color:var(--ink);
  font:600 20px/1.2 var(--display);text-align:center;cursor:pointer;touch-action:manipulation;user-select:none;-webkit-user-select:none;box-shadow:0 5px 0 var(--ink);transition:transform .06s,box-shadow .06s,background .15s,opacity .2s}
.choice:active,.bin:active{transform:translateY(4px);box-shadow:0 1px 0 var(--ink)}
.choice small,.bin small,.ochip small{position:absolute;left:7px;top:6px;display:grid;place-items:center;width:20px;height:20px;border:1.5px solid rgba(27,42,74,.35);border-radius:50%;font:800 11px/1 var(--body);color:rgba(27,42,74,.6);background:rgba(255,255,255,.7)}
.choice .ce{font-size:34px;line-height:1.1}
.choice .ct{overflow-wrap:anywhere}
.choice.c0{background:#D9F7F1}.choice.c1{background:#FFF3C4}.choice.c2{background:#FFE1EF}.choice.c3{background:#E9E1FF}
.choices.long .choice{flex-direction:row;justify-content:flex-start;gap:12px;min-height:58px;padding:8px 14px 8px 34px;text-align:left;font-size:18px}
.choices.long .choice .ce{font-size:28px}
.choices.long .choice small{top:50%;transform:translateY(-50%)}
.tf .choice{min-height:84px;flex-direction:row;gap:8px;font-size:24px}
.tf .choice .ic{width:30px;height:30px}
.tf .yes{background:var(--green-l);color:var(--green-d)}.tf .no{background:var(--red-l);color:var(--red-d)}
.choice.right,.bin.right{background:var(--green)!important;color:#fff;text-shadow:0 1px 0 rgba(27,42,74,.45);animation:popIn .3s}
.choice.wrong,.bin.wrong{background:var(--red)!important;color:#fff;text-shadow:0 1px 0 rgba(27,42,74,.45);animation:shake .4s}
.choice.right small,.choice.wrong small,.bin.right small,.bin.wrong small{background:#fff}
.choice.dim,.bin.dim{opacity:.5}
.choice:disabled,.bin:disabled{cursor:default}
.bin{min-height:118px;padding-top:24px;overflow:hidden;background:#F5FBFF;font-size:22px}
.bin-lip{position:absolute;left:0;right:0;top:0;height:16px;border-bottom:var(--ol);background:var(--bc,var(--brand))}
.bin.b0{--bc:var(--brand)}.bin.b1{--bc:var(--violet)}
.bin small{top:22px}
.bin .ce{font-size:34px}
/* order: tap the chips into the numbered slots */
.ls-answer.order{display:flex;flex-direction:column;gap:10px;max-width:520px}
.slots{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.slot{display:flex;align-items:center;gap:8px;min-height:46px}
.sn{display:grid;place-items:center;width:30px;height:30px;flex:none;border:var(--ol);border-radius:50%;background:var(--sun);font:700 16px var(--display)}
.hole{flex:1;height:44px;border:2.5px dashed #9FB0C3;border-radius:14px;background:rgba(255,255,255,.55)}
.slot.full .sn{background:var(--brand);color:#fff}
.slot.right .sn{background:var(--green);color:#fff}.slot.wrong .sn{background:var(--red);color:#fff}
.slot.right .ochip{background:var(--green-l);border-color:var(--green-d)}.slot.wrong .ochip{background:var(--red-l);border-color:var(--red-d)}
.ochip{position:relative;display:flex;align-items:center;justify-content:center;gap:8px;min-width:0;min-height:44px;padding:6px 12px;border:var(--ol);border-radius:14px;background:#fff;color:var(--ink);font:600 18px/1.15 var(--display);cursor:pointer;touch-action:manipulation;user-select:none;-webkit-user-select:none;box-shadow:0 4px 0 var(--ink)}
.ochip:active{transform:translateY(3px);box-shadow:0 1px 0 var(--ink)}
.ochip .ce{font-size:24px;line-height:1}
.ochip.placed{flex:1;justify-content:flex-start;background:var(--brand-l);box-shadow:0 3px 0 var(--ink)}
.ochip.placed:disabled{cursor:default;box-shadow:none}
.pool{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:10px;border:2.5px solid var(--ink);border-radius:18px;background:rgba(255,255,255,.6)}
.pool .ochip{padding-left:28px}
.pool .ochip.used{visibility:hidden}
.pool.done{display:block;padding:0;border:0;background:none}
.pool .check{width:100%}
/* feedback after a wrong answer: a sheet from the bottom */
.ls-fb{position:fixed;left:0;right:0;bottom:0;z-index:6;padding:14px 16px calc(16px + env(safe-area-inset-bottom));border-top:3px solid var(--ink);background:#FFE7EA;transform:translateY(110%);visibility:hidden;transition:transform .28s cubic-bezier(.2,.9,.3,1.1),visibility 0s .3s}
.ls-fb.show{transform:none;visibility:visible;transition:transform .28s cubic-bezier(.2,.9,.3,1.1)}
.fb-in{max-width:620px;margin:0 auto}
.fb-head{display:flex;align-items:center;gap:10px}
.fb-head b{flex:1;font:600 25px var(--display);color:var(--red-d)}
.fb-ic{display:grid;place-items:center;width:34px;height:34px;border:var(--ol);border-radius:50%;background:var(--red);color:#fff}
.fb-ic .ic{width:18px;height:18px}
.fb-ans{margin-top:6px;font:600 19px/1.3 var(--display);color:var(--ink)}
.fb-ans b{color:var(--green-d)}
.fb-order{margin:6px 0 0;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:6px;counter-reset:o}
.fb-order li{display:flex;align-items:center;gap:5px;padding:3px 10px 3px 6px;border:2px solid var(--ink);border-radius:99px;background:#fff;font-size:16px;counter-increment:o}
.fb-order li::before{content:counter(o);display:grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--green);color:#fff;font:800 12px var(--body)}
.fb-order .ce{font-size:18px}
.fb-x{display:flex;align-items:flex-start;gap:8px;margin-top:8px;padding:9px 12px;border:2px solid var(--ink);border-radius:14px;background:#fff;font-weight:700;color:var(--ink2);line-height:1.35}
.fb-x .ic{width:22px;height:22px;color:#E0A800;margin-top:1px}
.fb-row{display:flex;align-items:center;justify-content:flex-end;gap:12px;margin-top:12px}
.fb-again{flex:1;font-weight:800;font-size:14px;color:var(--red-d)}
.fb-row .btn{min-width:150px}
.fb-row .btn .ic{width:16px;height:16px}
.ls-pop{position:fixed;left:50%;top:32%;z-index:8;padding:16px 26px;opacity:0;pointer-events:none;transform:translate(-50%,-50%) scale(0);
  font:700 clamp(32px,8vw,54px)/1 var(--display);color:#fff;white-space:nowrap;-webkit-text-stroke:3px var(--ink);paint-order:stroke fill;text-shadow:0 4px 0 var(--ink)}
.ls-pop::before{content:"";position:absolute;inset:-46% -18%;z-index:-1;background:var(--lime);
  clip-path:polygon(50% 0%,59% 22%,79% 7%,76% 31%,100% 30%,83% 49%,99% 68%,75% 69%,79% 93%,58% 79%,47% 100%,39% 77%,15% 90%,21% 66%,0% 58%,19% 43%,4% 22%,28% 25%)}
.ls-pop::after{content:"";position:absolute;inset:-36% -10%;z-index:-1;background:var(--sun);clip-path:polygon(50% 0%,59% 22%,79% 7%,76% 31%,100% 30%,83% 49%,99% 68%,75% 69%,79% 93%,58% 79%,47% 100%,39% 77%,15% 90%,21% 66%,0% 58%,19% 43%,4% 22%,28% 25%)}
.ls-pop:not(.good)::before{background:var(--red)}
.ls-pop:not(.good)::after{background:#FF9AA3}
.ls-pop.show{animation:popWord .95s cubic-bezier(.2,1.3,.4,1) forwards}
.shot{position:fixed;z-index:7;width:50px;height:50px;color:var(--sun);pointer-events:none;transform:translate(-50%,-50%);filter:drop-shadow(0 3px 0 var(--ink)) drop-shadow(0 0 8px rgba(255,212,59,.9))}
.shot .ic{width:100%;height:100%}
@media (max-width:700px){
  .ls-stage{grid-template-columns:1fr 1fr;grid-template-rows:minmax(0,1fr) auto;grid-template-areas:"hero foe" "board board";gap:10px;padding:4px 14px}
  .lesson:not(.boss) .ls-stage{grid-template-columns:1fr 1fr;grid-template-areas:"hero ." "board board"}
  .ls-hero{width:clamp(76px,14vh,128px);justify-self:start;margin-bottom:-16px;z-index:2}
  .bubble{left:6px;max-width:min(220px,58vw);font-size:15px}
  .ls-foe .bubble{left:auto;right:6px;font-size:13px}
  .ls-foe{flex-direction:column-reverse;justify-self:end;width:auto;margin-bottom:-14px;z-index:2}
  .foe-art{width:clamp(86px,15vh,140px);flex:none}
  .foe-hp{width:100%;max-width:120px}
  .ls-board{padding:12px 12px 14px;border-radius:20px;box-shadow:5px 5px 0 var(--ink)}
  .ls-head{padding:0 40px;margin-bottom:4px}
  .ls-head .read-btn{right:8px;top:8px;width:40px;height:40px}
  .ls-say{font-size:15px}
  .ls-ok{right:-6px}
  .ls-answer{padding:12px 14px calc(16px + env(safe-area-inset-bottom))}
  .choice{min-height:74px;font-size:18px}
  .choice .ce{font-size:30px}
}
@media (max-height:700px){
  .ls-hero{width:64px}.foe-art{width:76px}
  .choice{min-height:62px}.choices.long .choice{min-height:50px}.tf .choice{min-height:70px}.bin{min-height:100px}
  .ls-e{font-size:36px}
  .slot{min-height:40px}.hole{height:38px}.ochip{min-height:40px}
  .ls-answer{padding-bottom:12px}
}

/* ---------- result: the discovery flask + the fixed Glitch Bot ---------- */
.result{position:fixed;inset:0;z-index:70;overflow:auto;display:flex;justify-content:center;background-color:var(--s2,#F4FBFA);
  background-image:var(--grid),linear-gradient(var(--s1,#FFF6D8),var(--s2,#F4FBFA));background-size:24px 24px,24px 24px,120px 120px,120px 120px,auto}
.res-bg{position:fixed;inset:0;pointer-events:none}
.res-bg svg{width:100%;height:100%}
.res-in{position:relative;z-index:1;width:100%;max-width:520px;margin:auto;padding:max(20px,env(safe-area-inset-top)) 16px calc(24px + env(safe-area-inset-bottom));text-align:center}
.res-art{display:flex;justify-content:center;min-height:150px;align-items:flex-end}
.res-chest{width:180px}
.res-chest svg{display:block;width:100%;height:auto}
.res-chest.open{animation:chestPop .55s cubic-bezier(.2,1.4,.4,1)}
.res-duo{display:flex;align-items:flex-end;justify-content:center;gap:4px}
.rd-hero{width:130px;animation:jump 1s ease-out}
.rd-foe{width:140px;animation:jump 1s .15s ease-out backwards}
.rd-foe svg,.rd-hero svg{display:block;width:100%;height:auto}
.result h1{display:inline-block;margin-top:10px;padding:4px 18px 6px;font-size:clamp(28px,8vw,40px);color:var(--ink);background:#fff;border:3px solid var(--ink);border-radius:16px;box-shadow:5px 5px 0 var(--ink);transform:rotate(-1.5deg)}
.res-sub{margin:14px 0 14px;font-weight:800;color:var(--ink2)}
.result.dark .res-sub{color:#fff;text-shadow:0 2px 0 var(--ink)}
.res-stars{display:flex;justify-content:center;gap:8px;margin:4px 0 16px}
.res-stars i{color:#fff}
.res-stars i .ic{width:56px;height:56px;filter:drop-shadow(0 3px 0 var(--ink)) drop-shadow(0 0 1px var(--ink))}
.res-stars i.on{color:var(--gold);animation:starIn .5s cubic-bezier(.3,1.6,.5,1) backwards}
.res-stars i.on:nth-child(2){animation-delay:.25s}.res-stars i.on:nth-child(3){animation-delay:.5s}
.res-tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.tile{border:var(--ol);border-radius:16px;overflow:hidden;background:#fff;box-shadow:4px 4px 0 var(--ink)}
.tile span{display:block;padding:4px;border-bottom:var(--ol);color:var(--ink);font:800 12px var(--body);letter-spacing:.08em;text-transform:uppercase}
.tile b{display:block;padding:9px 4px;font:600 24px var(--display);color:var(--ink)}
.tile.xp span{background:var(--sun)}.tile.acc span{background:var(--lime)}.tile.time span{background:#9CD2FF}
.res-list{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-direction:column;gap:8px;text-align:left}
.res-list li{display:flex;align-items:center;gap:12px;padding:11px 14px;border:var(--ol);border-radius:14px;background:#fff;box-shadow:3px 3px 0 var(--ink);font-weight:800;animation:slideIn .4s backwards}
.res-list li:nth-child(2){animation-delay:.1s}.res-list li:nth-child(3){animation-delay:.2s}.res-list li:nth-child(4){animation-delay:.3s}.res-list li:nth-child(5){animation-delay:.4s}
.res-list li span{flex:1}
.res-list li b{font:600 18px var(--display);color:var(--gold-d)}
.res-list li .ic{width:26px;height:26px;color:var(--brand-d)}
.res-list li .ic.gold{color:var(--gold)}.res-list li .ic.fire{color:var(--orange)}.res-list li .ic.medal{color:var(--pink)}.res-list li .ic.sparky{color:#F2A007}
.res-list .streak-li{background:var(--sun-l)}
.res-list .streak-li b{color:var(--green-d)}
.res-tip{display:flex;align-items:center;gap:10px;margin-top:14px;padding:12px 14px;border:var(--ol);border-radius:14px;background:#fff;font-weight:800;color:var(--brand-d);text-align:left}
.res-tip .ic{width:26px;height:26px}
.res-btns{display:flex;flex-direction:column;gap:14px;margin-top:22px}

/* ---------- modal ---------- */
.modal{position:fixed;inset:0;z-index:90;display:flex;align-items:center;justify-content:center;padding:16px;background:rgba(27,42,74,.55);opacity:0;transition:opacity .2s}
.modal.show{opacity:1}
.modal-card{width:100%;max-width:420px;max-height:calc(100vh - 32px);max-height:calc(100dvh - 32px);overflow:auto;padding:24px 22px 22px;border:3px solid var(--ink);border-radius:24px;background:#fff;text-align:center;box-shadow:7px 7px 0 var(--ink);animation:pop .25s ease-out}
.modal-card.wide{max-width:470px}
.modal-card.page{max-width:620px;text-align:left}
.modal-card h2{font-size:26px;margin-bottom:8px}
.modal-card h3{font-size:19px;margin:18px 0 6px}
.modal-card p{color:var(--ink2);font-weight:600}
.modal-card ul,.modal-card ol{padding-left:22px;color:var(--ink2);font-weight:600}
.modal-card li{margin:4px 0}
.modal-card .lead{color:var(--ink)}
.modal-card .credits{font-size:13px;color:var(--mute);margin-top:14px}
.modal-card .links{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.modal-card .links a{padding:5px 14px;border:2px solid var(--ink);border-radius:99px;font-weight:800;text-decoration:none;color:var(--ink);background:var(--brand-l)}
.m-art{display:flex;justify-content:center;margin-bottom:6px}
.m-art .buddy{width:120px}
.m-art.big .buddy{width:160px}
.m-art.small .buddy{width:84px}
.m-badge{position:relative;display:flex;justify-content:center;margin-bottom:8px}
.m-banner{position:relative;margin:-24px -22px 8px;aspect-ratio:400/190;overflow:hidden;border-bottom:3px solid var(--ink);border-radius:21px 21px 0 0}
.m-banner>svg{position:absolute;inset:0;width:100%;height:100%}
.m-banner+.m-badge{margin-top:-58px}
.mb-buddy{position:absolute;left:50%;bottom:-4px;width:120px;transform:translateX(-50%)}
.world-up h2,.onboard h2{margin-top:4px}
.m-badge .league-badge{width:110px;height:120px;animation:jump 1s ease-out}
.m-row{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:20px}
.m-row .btn{flex:1 1 140px}
.page .m-row{justify-content:flex-end}
.page .m-row .btn{flex:0 0 auto}
.celebrate{background:radial-gradient(circle at 50% 0%,#FFF6CC,#fff 55%)}
.onboard h2{margin-top:6px}
.swatches{display:flex;justify-content:center;gap:14px;margin:16px 0 8px}
.swatch{width:58px;height:58px;border-radius:50%;border:3px solid var(--ink);background:var(--sw);box-shadow:0 4px 0 var(--ink);cursor:pointer}
.swatch.on{outline:4px solid var(--brand);outline-offset:3px}
.goal-list{display:flex;flex-direction:column;gap:10px;margin-top:16px}
.goal-opt{display:flex;justify-content:space-between;align-items:center;padding:13px 18px;border:var(--ol);border-radius:16px;background:#fff;box-shadow:0 4px 0 var(--ink);cursor:pointer}
.goal-opt:active{transform:translateY(3px);box-shadow:0 1px 0 var(--ink)}
.goal-opt b{font:600 19px var(--display)}
.goal-opt span{color:var(--mute);font-weight:800}
.goal-opt.on{background:var(--brand-l);outline:3px solid var(--brand);outline-offset:2px}
.seg{display:flex;gap:4px;padding:4px;margin:16px 0;border:var(--ol);border-radius:16px;background:#fff}
.seg button{flex:1;min-height:40px;border:2px solid transparent;border-radius:11px;background:transparent;color:var(--ink2);font:600 15px var(--display);cursor:pointer;white-space:nowrap}
.seg button.on{background:var(--brand);color:#fff;border-color:var(--ink);text-shadow:0 1px 0 rgba(27,42,74,.4)}
.seg.wide{overflow-x:auto;scrollbar-width:none}
.seg.wide button{flex:1 0 auto;padding:0 14px}
.form{display:flex;flex-direction:column;gap:12px;text-align:left;margin-top:6px}
.form label{display:flex;flex-direction:column;gap:5px;font-weight:800;font-size:14px;color:var(--ink2)}
.form input{height:50px;padding:0 14px;border:var(--ol);border-radius:14px;background:#F7FBFC;font:700 17px var(--body);color:var(--ink)}
.form input:focus{outline:3px solid var(--brand);outline-offset:1px;background:#fff}
.form-err{min-height:1.2em;color:var(--red-d);font-weight:800;font-size:14px}
.form .btn{margin-top:4px}
.kid-note{display:flex;gap:10px;margin-top:16px;padding:12px;border:2px solid var(--ink);border-radius:14px;background:var(--sun-l);font-size:14px;text-align:left;color:var(--ink)!important}
.kid-note .ic{width:22px;height:22px;color:var(--gold-d);margin-top:2px}
details.danger{margin-top:14px;text-align:left;border:var(--ol);border-radius:14px;padding:10px 14px}
details.danger summary{cursor:pointer;font:600 17px var(--display)}
.m-medal{display:flex;justify-content:center;margin-bottom:10px}
.m-medal .b-medal{width:100px;height:100px}
.m-medal .b-medal .ic{width:48px;height:48px}

/* ---------- league ---------- */
.league-hero{padding:0;overflow:hidden}
.lh-art{position:relative;aspect-ratio:400/150;overflow:hidden;border-bottom:var(--ol)}
.lh-art svg{position:absolute;inset:0;width:100%;height:100%}
.lh-in{display:flex;align-items:center;gap:16px;padding:0 18px 16px}
.league-hero .league-badge{width:88px;height:96px;flex:none;margin-top:-40px;filter:drop-shadow(3px 3px 0 var(--ink))}
.league-hero small,.goal-card small,.streak-card small,.shop-top small{font:800 13px var(--body);letter-spacing:.1em;text-transform:uppercase;color:var(--mute)}
.league-hero h1{font-size:30px}
.league-hero p{color:var(--ink2);font-weight:700;margin-top:4px}
.ladder{display:flex;gap:5px;overflow-x:auto;padding:16px 2px 8px;scrollbar-width:thin}
.rung{display:flex;flex-direction:column;align-items:center;gap:3px;min-width:55px;font:800 11px var(--body);color:var(--mute)}
.rung .league-badge{width:44px;height:48px}
.rung.on{color:var(--ink)}
.rung.on span{padding:0 7px;border:2px solid var(--ink);border-radius:99px;background:var(--lime)}
.rung.on .league-badge{transform:scale(1.15);filter:drop-shadow(2px 2px 0 var(--ink))}
.lb{display:flex;flex-direction:column;gap:8px}
.lb-row{display:flex;align-items:center;gap:12px;padding:7px 14px;border:var(--ol);border-radius:14px;background:#fff;box-shadow:3px 3px 0 var(--ink)}
.lb-row .rk{display:flex;align-items:center;gap:2px;min-width:44px;font:600 18px var(--display);color:var(--mute)}
.lb-row .rk .ic{width:20px;height:20px}
.lb-row .av{width:44px;flex:none}
.lb-row .nm{flex:1;min-width:0;font-weight:800;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lb-row .nm small{color:var(--mute);font-weight:800;margin-left:4px}
.lb-row .xp{font:600 17px var(--display);color:var(--ink2);white-space:nowrap}
.lb-row.top1{background:#FFF4C2}.lb-row.top1 .rk{color:#B47C00}
.lb-row.top2{background:#EEF2F7}.lb-row.top2 .rk{color:#66738A}
.lb-row.top3{background:#FFE9D9}.lb-row.top3 .rk{color:#B0601E}
.lb-row.me{background:var(--brand-l);outline:3px solid var(--brand);outline-offset:2px}
.lb-row.sep{margin-top:10px}
.lb .empty{padding:26px 12px;text-align:center;color:var(--mute);font-weight:800;border:2.5px dashed #9FB0C3;border-radius:16px;background:rgba(255,255,255,.6)}
.cta-card{display:flex;align-items:center;gap:14px;margin-bottom:14px;background:var(--sun-l)}
.cta-card .buddy{width:84px;flex:none}
.cta-card b{font:600 19px var(--display)}
.cta-card p{color:var(--ink2);font-weight:700;margin:2px 0 10px}
.how{margin-top:18px}
.how summary{cursor:pointer;font:600 17px var(--display)}
.how ul{margin:10px 0 0;padding-left:20px;color:var(--ink2);font-weight:700}
.how li{margin:5px 0}
.muted.center .ic{display:inline-block;vertical-align:-4px;color:var(--gold)}

/* ---------- missions ---------- */
.goal-card,.streak-card{display:flex;align-items:center;gap:18px;margin-bottom:16px}
.goal-card h2,.streak-card h2{font-size:22px;margin:2px 0 4px}
.goal-card p,.streak-card p{color:var(--ink2);font-weight:700;margin-bottom:10px}
.big-ring{position:relative;width:120px;height:120px;flex:none}
.big-ring .ring{width:120px;height:120px}
.big-ring b{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;font:600 30px/1 var(--display)}
.big-ring small{font:800 12px var(--body);color:var(--mute);margin-top:4px}
.streak-card{align-items:flex-start;background:linear-gradient(135deg,#fff 40%,var(--sun-l))}
.spark-big{position:relative;display:grid;place-items:center;width:104px;height:104px;flex:none;border:3px solid var(--ink);border-radius:50%;background:#EDF2F6;color:#B9C6CF;box-shadow:0 4px 0 var(--ink)}
.streak-card.on .spark-big{background:var(--ink);color:var(--sun)}
.streak-card.on .spark-big .ic{animation:glow 1.6s ease-in-out infinite}
.spark-big .ic{width:74px;height:74px}
.spark-big b{position:absolute;right:-6px;bottom:-4px;min-width:40px;padding:0 6px;border:var(--ol);border-radius:99px;background:var(--lime);color:var(--ink);font:700 22px/1.3 var(--display);text-align:center}
.week{display:flex;gap:6px;flex-wrap:wrap}
.week span{display:flex;flex-direction:column;align-items:center;gap:2px;width:34px;font:800 12px var(--body);color:var(--mute)}
.week i{display:grid;place-items:center;width:30px;height:30px;border:2px solid #B8C6D2;border-radius:50%;background:#fff}
.week .done i{background:var(--sun);border-color:var(--ink);color:var(--ink)}
.week .today i{outline:2.5px solid var(--brand);outline-offset:2px}
.week .ic{width:18px;height:18px}
.umb{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-top:10px!important;font-size:14px;color:#1F6FB8!important}
.umb .ic{width:20px;height:20px;color:#3B9BEA}
.quests{display:flex;flex-direction:column;gap:12px}
.quest{display:flex;align-items:center;gap:14px;padding:14px 16px}
.quest>div{flex:1;min-width:0}
.quest b{display:block;font-weight:800;margin-bottom:6px}
.q-ic{display:grid;place-items:center;width:46px;height:46px;flex:none;border:var(--ol);border-radius:14px;background:var(--brand-l);color:var(--brand-d)}
.q-ic .ic{width:26px;height:26px}
.q-rew{display:flex;align-items:center;gap:3px;font:600 17px var(--display);color:var(--gold-d)}
.q-rew .ic{width:22px;height:22px}
.quest.done{background:var(--green-l)}
.quest.done .q-ic{background:#fff;color:var(--green-d)}
.quest.done .q-rew{color:var(--green-d)}
.qbar{position:relative;height:20px;border:2px solid var(--ink);border-radius:99px;background:#fff;overflow:hidden}
.qbar i{position:absolute;left:0;top:0;bottom:0;width:0;background:repeating-linear-gradient(-45deg,#FFE066 0 8px,var(--sun) 8px 16px);transition:width .6s}
.qbar span{position:relative;display:block;text-align:center;font:800 12px/16px var(--body);color:var(--ink);text-shadow:0 0 2px #fff,0 0 3px #fff,0 0 4px #fff}
.qbar.big{height:26px}.qbar.big span{line-height:22px;font-size:13px}
.quest.done .qbar i,.rq.done .qbar i{background:repeating-linear-gradient(-45deg,#B6F5C6 0 8px,#8DEBA6 8px 16px)}

/* ---------- shop ---------- */
.shop-top{display:flex;align-items:center;gap:16px;background:linear-gradient(135deg,#fff 30%,var(--sun-l))}
.shop-buddy{width:130px;flex:none}
.shop-top h1{display:flex;align-items:center;gap:6px;font-size:32px}
.shop-top h1 .ic{width:32px;height:32px}
.shop-top p{color:var(--ink2);font-weight:700;margin:4px 0 8px}
.items{display:grid;grid-template-columns:repeat(auto-fill,minmax(128px,1fr));gap:14px}
.item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 8px 10px;border:var(--ol);border-radius:16px;background:#fff;box-shadow:0 4px 0 var(--ink);cursor:pointer;text-align:center;color:var(--ink)}
.item:active{transform:translateY(3px);box-shadow:0 1px 0 var(--ink)}
.item .buddy{width:86px}
.item b{font:600 15px var(--display);line-height:1.15}
.item.on{background:var(--brand-l);outline:3px solid var(--brand);outline-offset:2px}
.item.locked{background:#F1F4F7}
.item.locked .buddy{filter:grayscale(1);opacity:.6}
.state{display:inline-flex;align-items:center;gap:3px;padding:1px 10px;border:2px solid var(--ink);border-radius:99px;background:#fff;font:800 12px var(--body);color:var(--ink)}
.state .ic{width:15px;height:15px}
.state.on{background:var(--brand);color:#fff}
.state.price{background:var(--sun-l);color:var(--gold-d)}
.state.lock{background:#E3E8EE;color:#66738A;border-color:#8D9AB0}
.item.power{display:flex;flex-direction:row;align-items:center;gap:14px;text-align:left;cursor:default;padding:16px;box-shadow:4px 4px 0 var(--ink)}
.item.power:active{transform:none}
.item.power>div{flex:1}
.item.power b{font-size:18px}
.item.power p{color:var(--ink2);font-weight:700}
.p-ic{display:grid;place-items:center;width:58px;height:58px;flex:none;border:var(--ol);border-radius:50%;background:#D8EEFF;color:#1F7FD6}
.p-ic .ic{width:34px;height:34px}

/* ---------- profile ---------- */
.profile-hero{display:flex;align-items:center;gap:16px;background:linear-gradient(135deg,#fff 35%,var(--brand-l))}
.p-buddy{width:130px;flex:none}
.profile-hero h1{font-size:30px;word-break:break-word}
.p-league{display:flex;align-items:center;gap:6px;margin:4px 0 12px;font-weight:800;color:var(--ink2)}
.p-league .league-badge{width:26px;height:28px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}
.stat{display:flex;flex-direction:column;align-items:center;gap:2px;padding:12px 6px;border:var(--ol);border-radius:16px;background:#fff;text-align:center;box-shadow:3px 3px 0 var(--ink)}
.stat .ic{width:28px;height:28px;color:var(--brand-d)}
.stat b{font:600 22px var(--display)}
.stat span{font-size:13px;font-weight:800;color:var(--mute)}
.stat.xp .ic{color:var(--gold)}.stat.sparky .ic{color:#F2A007}.stat.ok .ic{color:var(--green)}.stat.gold .ic{color:var(--gold)}.stat.acc .ic{color:var(--blue)}.stat.path .ic{color:var(--violet)}
.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(98px,1fr));gap:12px}
.badge{display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 6px;border:var(--ol);border-radius:16px;background:#fff;cursor:pointer;color:var(--ink);box-shadow:0 3px 0 var(--ink)}
.badge:active{transform:translateY(2px);box-shadow:0 1px 0 var(--ink)}
.badge b{font:600 13px/1.15 var(--display);color:var(--ink2)}
.badge:not(.got){background:#F3F6F9}
/* hexagonal medals (a nod to chemistry): an ink hexagon with the colour inset */
.b-medal{position:relative;display:grid;place-items:center;width:58px;height:58px;color:#fff;background:var(--ink);clip-path:polygon(25% 4%,75% 4%,100% 50%,75% 96%,25% 96%,0 50%)}
.b-medal::before{content:"";position:absolute;inset:3.5px;background:#DCE3EA;clip-path:polygon(25% 4%,75% 4%,100% 50%,75% 96%,25% 96%,0 50%)}
.b-medal .ic{position:relative;width:28px;height:28px;filter:drop-shadow(0 2px 0 rgba(27,42,74,.35))}
.badge.got .b-medal::before,.m-medal.got .b-medal::before{background:var(--bc)}
.badge:not(.got) .b-medal .ic,.m-medal:not(.got) .b-medal .ic{color:#AEBACA;filter:none}
.badge:not(.got) .b-medal{background:#AEBACA}
.account-card,.settings{margin-top:18px}
.acc-row{display:flex;align-items:center;gap:12px}
.acc-row>.ic{width:36px;height:36px;color:var(--brand-d);flex:none}
.acc-row b{font:600 18px var(--display)}
.acc-row p{color:var(--ink2);font-weight:700}
.account-card .m-row{justify-content:flex-start;margin-top:14px}
.account-card .m-row .btn{flex:0 0 auto}
.settings h2{font-size:20px;margin-bottom:8px}
.set-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 0;border-top:2px dashed var(--soft)}
.set-row span{display:flex;align-items:center;gap:10px;font-weight:800}
.set-row span .ic{width:24px;height:24px;color:var(--brand-d)}
.switch{position:relative;width:60px;height:34px;flex:none;border:var(--ol);border-radius:99px;background:#DCE3EA;cursor:pointer;transition:background .2s}
.switch i{position:absolute;left:3px;top:2.5px;width:24px;height:24px;border:2px solid var(--ink);border-radius:50%;background:#fff;transition:transform .2s}
.switch.on{background:var(--brand)}
.switch.on i{transform:translateX(25px)}
.foot-links{display:flex;justify-content:center;gap:22px;margin-top:22px}
.ver{text-align:center;color:var(--mute);font-size:13px;font-weight:700;margin-top:10px}
.steps{text-align:left}
.note{font-size:14px}

/* ---------- league badges + buddies ---------- */
.league-badge{display:block}
.league-badge.locked{opacity:.85}
.buddy{display:block;width:100%;height:auto;overflow:visible}
.wave-arm{transform-origin:92px 60px;transform-box:view-box;animation:wave 1.2s ease-in-out infinite}

/* ---------- toast, fx, unofficial ---------- */
#toast{position:fixed;left:50%;bottom:calc(var(--tab-h) + env(safe-area-inset-bottom) + 26px);z-index:120;max-width:calc(100vw - 32px);padding:11px 20px;border:2.5px solid var(--ink);border-radius:14px;background:var(--ink);color:#fff;font-weight:800;text-align:center;box-shadow:0 4px 0 rgba(27,42,74,.35);
  transform:translate(-50%,20px);opacity:0;pointer-events:none;transition:opacity .25s,transform .25s}
#toast.show{opacity:1;transform:translate(-50%,0)}
#toast.good{background:var(--green-d)}
@media (min-width:760px){#toast{bottom:24px}}
#fx{position:fixed;inset:0;width:100%;height:100%;z-index:110;pointer-events:none}
#unofficial{display:none;position:fixed;left:0;right:0;top:0;z-index:250;padding:8px 12px;background:#B3261E;color:#fff;font-weight:800;text-align:center}
html.unofficial #unofficial{display:block}
.noscript{padding:24px;text-align:center;font-weight:800}

/* ---------- small screens ---------- */
@media (max-width:420px){
  .chip-league span{display:none}
  .chip{padding:3px 7px;font-size:16px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .goal-card,.streak-card,.profile-hero,.league-hero{flex-direction:column;text-align:center}
  .shop-top{gap:12px;padding:14px}
  .shop-buddy{width:100px}
  .shop-top h1{font-size:28px}
  .shop-top p{font-size:14px}
  .seg.wide button{flex:1 1 auto;padding:0 6px;font-size:14px}
  .streak-card{align-items:center}
  .week{justify-content:center}
  .umb{justify-content:center}
  .cta-card{flex-direction:column;text-align:center}
  .p-league{justify-content:center}
  .sign h2{font-size:20px}
}
@media (max-width:370px){
  .topbar{gap:4px}
  .chip{min-height:38px;padding:2px 6px;font-size:15px;gap:4px}
  .ls-answer.choices:not(.long) .choice{font-size:17px}
}

/* ---------- motion ---------- */
@keyframes pop{0%{transform:scale(.85);opacity:0}100%{transform:scale(1);opacity:1}}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-10px)}40%{transform:translateX(9px)}60%{transform:translateX(-6px)}80%{transform:translateX(4px)}}
@keyframes jump{0%{transform:translateY(30px) scale(.8);opacity:0}50%{transform:translateY(-14px) scale(1.05);opacity:1}100%{transform:none}}
@keyframes starIn{0%{transform:scale(0) rotate(-40deg)}100%{transform:scale(1) rotate(0)}}
@keyframes slideIn{0%{transform:translateY(12px);opacity:0}100%{transform:none;opacity:1}}
@keyframes wave{0%,100%{transform:rotate(0)}50%{transform:rotate(-22deg)}}
@keyframes popIn{0%{opacity:0;scale:.85}100%{opacity:1;scale:1}}
@keyframes qIn{0%{opacity:0;transform:translateY(12px) scale(.97)}100%{opacity:1;transform:none}}
@keyframes ring{0%{box-shadow:0 3px 0 var(--ink),0 0 0 0 rgba(255,255,255,.95)}70%{box-shadow:0 3px 0 var(--ink),0 0 0 16px rgba(255,255,255,0)}100%{box-shadow:0 3px 0 var(--ink),0 0 0 0 rgba(255,255,255,0)}}
@keyframes wobble{0%,100%{transform:translate(-50%,-50%) rotate(0)}25%{transform:translate(-50%,-50%) rotate(-14deg)}75%{transform:translate(-50%,-50%) rotate(14deg)}}
@keyframes talk{0%,100%{transform:scale(1)}50%{transform:scale(1.1)}}
@keyframes glow{0%,100%{transform:scale(1);filter:drop-shadow(0 0 0 rgba(255,212,59,0))}50%{transform:scale(1.08);filter:drop-shadow(0 0 8px rgba(255,212,59,.9))}}
@keyframes blinkBar{0%,100%{opacity:1}50%{opacity:.35}}
@keyframes popWord{0%{opacity:0;transform:translate(-50%,-50%) scale(0) rotate(-14deg)}22%{opacity:1;transform:translate(-50%,-50%) scale(1.18) rotate(5deg)}42%{transform:translate(-50%,-50%) scale(1) rotate(-3deg)}78%{opacity:1;transform:translate(-50%,-50%) scale(1) rotate(-3deg)}100%{opacity:0;transform:translate(-50%,-70%) scale(.9) rotate(-3deg)}}
@keyframes foeHit{0%{transform:translateX(0) rotate(0)}20%{transform:translateX(14px) rotate(8deg) scale(.94)}45%{transform:translateX(-8px) rotate(-5deg)}70%{transform:translateX(4px) rotate(2deg)}100%{transform:none}}
@keyframes chestPop{0%{transform:scale(.9)}50%{transform:scale(1.12) translateY(-8px)}100%{transform:none}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes blink{0%,93%,100%{transform:scaleY(1)}96%{transform:scaleY(.12)}}
.buddy .eyes{transform-box:fill-box;transform-origin:center;animation:blink 4.8s infinite}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}