/* LEVEL A WORD LAB — IUE-SFL vocabulary practice */
*{box-sizing:border-box}
:root{
  --ink:#2d2a45; --muted:#726d95; --paper:#f6f3fd; --card:#ffffff;
  --h:255; --uc:hsl(var(--h) 65% 58%); --uc-deep:hsl(var(--h) 60% 46%);
  --uc-soft:hsl(var(--h) 70% 93%); --uc-mid:hsl(var(--h) 62% 84%);
  --ok:#27a06b; --ok-soft:#dff4ea; --no:#e05d5d; --no-soft:#fce5e5;
  --gold:#f2b727; --r:22px;
}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.55 Nunito,system-ui,sans-serif;color:var(--ink);
  background:var(--paper);min-height:100vh;overflow-x:hidden}
h1,h2,h3,.btn,.pill,.chip,.tabbtn{font-family:Fredoka,Quicksand,Nunito,sans-serif}

/* floating lab blobs */
.blobs{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none}
.blob{position:absolute;border-radius:50%;filter:blur(60px);opacity:.5;animation:drift 24s ease-in-out infinite alternate}
.blob.b1{width:44vw;height:44vw;background:#d9ccff;top:-12vw;left:-10vw}
.blob.b2{width:36vw;height:36vw;background:#ffd9ec;bottom:-10vw;right:-8vw;animation-delay:-8s}
.blob.b3{width:26vw;height:26vw;background:#cdeaff;top:36vh;right:18vw;animation-delay:-16s}
@keyframes drift{to{transform:translate(6vw,4vh) scale(1.12)}}
@media (prefers-reduced-motion:reduce){.blob{animation:none}*{transition:none!important}}

/* ---------------- top bar ---------------- */
.top{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:12px;
  padding:10px 16px;background:#fffdfef2;backdrop-filter:blur(8px);border-bottom:2px solid #eee7fb}
.brand{font:600 1.1rem Fredoka;color:var(--uc-deep);text-decoration:none;display:flex;gap:8px;align-items:center;cursor:pointer;background:none;border:0}
.top .grow{flex:1}
.starbank{font:600 .95rem Fredoka;background:#fff6db;border:2px solid #f6df9a;color:#8a6b0c;
  border-radius:999px;padding:5px 14px}
.moderib{font:700 .68rem Nunito;letter-spacing:.08em;padding:5px 12px;border-radius:999px}
.moderib.student{background:var(--uc-soft);color:var(--uc-deep)}
.moderib.teacher{background:#efe0ff;color:#7a3fc1}

/* ---------------- home ---------------- */
.hero{text-align:center;padding:54px 16px 18px}
.kicker{font:700 .78rem Nunito;letter-spacing:.14em;color:var(--uc-deep);text-transform:uppercase}
.hero h1{font:600 clamp(2.3rem,7vw,3.6rem)/1.05 Fredoka;margin:10px 0 6px;
  background:linear-gradient(92deg,#6c5ce7,#c0392b 55%,#e67e22);
  background:linear-gradient(92deg,#6d55e0,#c85bb2 55%,#e58f3c);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--muted);max-width:52ch;margin:0 auto}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(158px,1fr));gap:14px;
  max-width:1040px;margin:26px auto 70px;padding:0 16px}
.ucard{--uc:hsl(var(--h) 65% 58%);--uc-deep:hsl(var(--h) 60% 42%);--uc-soft:hsl(var(--h) 70% 92%);
  background:var(--card);border:2.5px solid var(--uc-soft);border-radius:var(--r);
  padding:16px 14px 14px;cursor:pointer;text-align:left;position:relative;
  transition:transform .14s,box-shadow .14s;font:inherit;color:inherit}
.ucard:hover{transform:translateY(-4px) rotate(-.6deg);box-shadow:0 16px 26px -18px var(--uc)}
.ucard .uicon{font-size:1.9rem}
.ucard h3{margin:8px 0 2px;font:600 1rem Fredoka;color:var(--uc-deep)}
.ucard .uth{font-size:.72rem;color:var(--muted);min-height:2.1em}
.ring{position:absolute;top:12px;right:12px;width:34px;height:34px}
.ring svg{transform:rotate(-90deg)}
.ring .bg{stroke:var(--uc-soft)} .ring .fg{stroke:var(--uc);transition:stroke-dashoffset .5s}
.ring .pct{position:absolute;inset:0;display:grid;place-items:center;font:700 .58rem Nunito;color:var(--uc-deep)}
.ucard.boss{grid-column:1/-1;background:linear-gradient(120deg,#2f2a4d,#4b3f7a);border-color:#6f5fae;color:#fff}
.ucard.boss h3{color:#ffd76a}.ucard.boss .uth{color:#cfc6ee}
.ucard .stars{font-size:.8rem;letter-spacing:.06em}

/* ---------------- unit page ---------------- */
.unitwrap{max-width:880px;margin:0 auto;padding:16px 16px 90px}
.uhead{display:flex;align-items:center;gap:14px;margin:16px 0 4px}
.uhead .big{font-size:2.4rem}
.uhead h2{margin:0;font:600 1.7rem Fredoka;color:var(--uc-deep)}
.uhead .uth{color:var(--muted);font-size:.9rem}
.tabrow{display:flex;gap:8px;margin:16px 0;flex-wrap:wrap}
.tabbtn{border:2px solid var(--uc-mid);background:#fff;color:var(--uc-deep);border-radius:999px;
  padding:8px 16px;font:500 .9rem Fredoka;cursor:pointer}
.tabbtn.on{background:var(--uc);border-color:var(--uc);color:#fff;box-shadow:0 6px 14px -8px var(--uc)}
.tasknav{display:flex;gap:8px;flex-wrap:wrap;margin:6px 0 16px}
.tchip{border:2px solid var(--uc-mid);background:#fff;border-radius:14px;padding:7px 13px;
  font:600 .85rem Nunito;cursor:pointer;display:flex;gap:6px;align-items:center;color:var(--ink)}
.tchip.on{background:var(--uc-soft);border-color:var(--uc)}
.tchip .st{color:var(--gold);font-size:.78rem}

/* ---------------- task card ---------------- */
.taskcard{background:var(--card);border:2.5px solid var(--uc-soft);border-radius:var(--r);
  padding:20px 20px 16px;box-shadow:0 14px 30px -22px rgba(90,70,160,.55)}
.tinstr{font:600 1.02rem Nunito;margin:0 0 14px}
.tinstr .tno{background:var(--uc);color:#fff;border-radius:11px;padding:2px 10px;
  font:600 .82rem Fredoka;margin-right:8px}
.bar{display:flex;align-items:center;gap:10px;margin-top:16px;flex-wrap:wrap}
.btn{border:0;border-radius:15px;padding:10px 20px;font:500 .95rem Fredoka;cursor:pointer;
  background:var(--uc);color:#fff;box-shadow:0 6px 14px -7px var(--uc)}
.btn.ghost{background:#fff;color:var(--uc-deep);border:2px solid var(--uc-mid);box-shadow:none}
.btn.teach{background:#8a4fd0}
.btn:active{transform:translateY(1px)}
.verdict{font:600 .95rem Fredoka}
.verdict.ok{color:var(--ok)} .verdict.try{color:var(--no)}
.starrow{font-size:1.15rem;letter-spacing:.1em}

/* generic pills / chips */
.pill{border:2.5px solid var(--uc-mid);background:#fff;border-radius:16px;padding:9px 14px;
  cursor:pointer;font:500 .95rem Fredoka;color:var(--ink);transition:transform .08s}
.pill:hover{transform:translateY(-1px)}
.pill.sel{background:var(--uc);border-color:var(--uc);color:#fff}
.pill.right{background:var(--ok);border-color:var(--ok);color:#fff}
.pill.wrong{background:var(--no);border-color:var(--no);color:#fff;animation:shake .3s}
.pill.dim{opacity:.4}
@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.chip{border:0;background:var(--uc-soft);border-radius:999px;padding:8px 15px;
  font:500 .9rem Fredoka;cursor:pointer;box-shadow:0 2px 0 var(--uc-mid);color:var(--uc-deep)}
.chip.used{opacity:.32;text-decoration:line-through;box-shadow:none}
.tray{display:flex;flex-wrap:wrap;gap:9px;background:#faf7ff;border:2px dashed var(--uc-mid);
  border-radius:16px;padding:12px;margin-bottom:14px}

/* match */
.mgrid{display:grid;grid-template-columns:1fr 1fr;gap:10px 18px}
@media(max-width:560px){.mgrid{grid-template-columns:1fr}}
.mcolL,.mcolR{display:flex;flex-direction:column;gap:9px}
.mp{display:flex;align-items:center;gap:9px}
.mp .tag{min-width:26px;height:26px;border-radius:9px;display:grid;place-items:center;
  background:var(--uc-soft);color:var(--uc-deep);font:600 .8rem Fredoka;flex:none}
.mp .pill{flex:1;text-align:left}
.mp .pill.paired{border-style:solid}
.pairdot{width:12px;height:12px;border-radius:50%;flex:none;opacity:0;transition:opacity .2s}
.mp .pill.paired+.pairdot,{opacity:1}

/* sentences with inline widgets */
.sent{padding:9px 4px;border-radius:12px;line-height:2.15}
.sent+.sent{border-top:1.5px dashed var(--uc-soft)}
.sent .sn{background:var(--uc-soft);color:var(--uc-deep);border-radius:8px;min-width:24px;height:24px;
  display:inline-grid;place-items:center;font:600 .78rem Fredoka;margin-right:7px}
input.blank{border:0;border-bottom:3px solid var(--uc);background:var(--uc-soft);
  border-radius:11px 11px 0 0;padding:4px 10px;font:600 .95rem Nunito;width:120px;color:var(--ink)}
input.blank.right{background:var(--ok-soft);border-color:var(--ok)}
input.blank.wrong{background:var(--no-soft);border-color:var(--no)}
input.blank[readonly]{opacity:.95}
.basetag{background:#fff2d9;color:#946908;border-radius:9px;padding:2px 9px;font:600 .8rem Fredoka;margin-left:6px}
.optin{display:inline-flex;gap:6px;margin:0 4px;vertical-align:middle}
.optin .pill{padding:5px 12px;font-size:.88rem}

/* columns game */
.buckets{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.bucket{background:var(--uc-soft);border:2.5px solid var(--uc-mid);border-radius:18px;padding:10px;min-height:130px}
.bucket h4{margin:2px 0 8px;font:600 .9rem Fredoka;color:var(--uc-deep);text-align:center}
.bucket .chip{display:inline-flex;margin:3px;background:#fff}
.bucket.right{border-color:var(--ok);background:var(--ok-soft)}
.bucket .chip.right{color:var(--ok)} .bucket .chip.wrong{color:var(--no);text-decoration:line-through}

/* odd one out */
.oddrow{display:flex;gap:9px;flex-wrap:wrap;align-items:center;padding:8px 0}
.oddrow+.oddrow{border-top:1.5px dashed var(--uc-soft)}

/* first letter puzzle */
.flrow{padding:10px 0}
.flrow+.flrow{border-top:1.5px dashed var(--uc-soft)}
.flclue{margin-bottom:6px}
.cells{display:inline-flex;gap:5px;vertical-align:middle}
.cell{width:34px;height:40px;border:2.5px solid var(--uc-mid);border-radius:10px;text-align:center;
  font:600 1.05rem Fredoka;text-transform:lowercase;background:#fff;color:var(--ink)}
.cell.given{background:var(--uc-soft);border-color:var(--uc);color:var(--uc-deep)}
.cell.right{background:var(--ok-soft);border-color:var(--ok)}
.cell.wrong{background:var(--no-soft);border-color:var(--no)}

/* form table */
.ftable{border-collapse:separate;border-spacing:0;width:100%;max-width:480px;border:2.5px solid var(--uc-soft);border-radius:16px;overflow:hidden}
.ftable td,.ftable th{padding:8px 14px;border-bottom:1.5px solid var(--uc-soft)}
.ftable tr:last-child td{border-bottom:0}
.ftable th{background:var(--uc-soft);font:600 .9rem Fredoka;color:var(--uc-deep);text-align:left}

/* flashcards */
.deck{display:grid;place-items:center;padding:14px 0 6px}
.fcard{width:min(430px,92vw);height:230px;perspective:1100px;cursor:pointer}
.finner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.fcard.flip .finner{transform:rotateY(180deg)}
.fface{position:absolute;inset:0;border-radius:24px;display:grid;place-items:center;padding:20px;
  backface-visibility:hidden;font:500 1.25rem Fredoka;text-align:center}
.ffront{background:linear-gradient(135deg,var(--uc),var(--uc-deep));color:#fff}
.fback{background:#fff;border:3px solid var(--uc);color:var(--uc-deep);transform:rotateY(180deg)}
.fmeta{text-align:center;color:var(--muted);font-size:.85rem;margin-top:8px}
.fbtns{display:flex;gap:10px;justify-content:center;margin-top:12px}

/* lightning round */
.lr{max-width:560px;margin:0 auto;text-align:center}
.timerbar{height:12px;background:var(--uc-soft);border-radius:999px;overflow:hidden;margin:12px 0}
.timerbar i{display:block;height:100%;background:linear-gradient(90deg,var(--uc),var(--gold));border-radius:999px}
.lrq{font:600 1.3rem Fredoka;margin:14px 0}
.lropts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
@media(max-width:480px){.lropts{grid-template-columns:1fr}}
.lrscore{font:600 1rem Fredoka;color:var(--uc-deep)}
.besttag{background:#fff6db;border-radius:999px;padding:4px 12px;font:600 .8rem Fredoka;color:#8a6b0c}

/* mascot */
.lexi{position:fixed;right:14px;bottom:14px;z-index:60;display:flex;align-items:flex-end;gap:8px;pointer-events:none}
.lexi .owl{font-size:2.5rem;filter:drop-shadow(0 4px 8px rgba(0,0,0,.18));animation:bob 3.4s ease-in-out infinite}
@keyframes bob{50%{transform:translateY(-6px)}}
.speech{background:#fff;border:2.5px solid var(--uc-mid);border-radius:16px 16px 4px 16px;
  padding:8px 13px;font:500 .85rem Fredoka;color:var(--ink);max-width:200px;opacity:0;transform:translateY(8px);
  transition:opacity .25s,transform .25s;box-shadow:0 8px 18px -10px rgba(90,70,160,.5)}
.speech.show{opacity:1;transform:none}

/* confetti */
.confetti{position:fixed;top:-12px;width:10px;height:16px;z-index:70;pointer-events:none;
  animation:fall linear forwards}
@keyframes fall{to{transform:translateY(105vh) rotate(720deg)}}

/* teacher key */
.keysheet{background:#f2fbf6;border:2px solid #bfe3cf;border-radius:16px;padding:14px 18px;margin-top:14px;font-size:.92rem}
.keysheet h4{margin:0 0 6px;font-family:Fredoka;color:#1e7d55}

.foot{text-align:center;color:var(--muted);font-size:.82rem;padding:30px 16px}
.hidden{display:none!important}
button:focus-visible,input:focus-visible{outline:3px solid var(--uc);outline-offset:2px}