:root {
  --sky: #29B6F6; --sun: #FDD835; --grass: #66BB6A;
  --coral: #FF6E40; --purple: #AB47BC; --mint: #26C6DA;
  --peach: #FFA726; --rose: #EC407A;
  --navy: #1A237E; --ink: #263238;
  --white: #FFFFFF; --cream: #FFFDE7; --light: #F0F4FF;
  --shadow-sm: 0 4px 0 rgba(0,0,0,0.12);
  --shadow-md: 0 7px 0 rgba(0,0,0,0.12);
  --shadow-lg: 0 10px 0 rgba(0,0,0,0.1);
  --radius: 22px;
  --font-head: 'Fredoka One', cursive;
  --font-body: 'Baloo 2', sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:var(--font-body);background:#e8f4fd;min-height:100vh;overflow-x:hidden;}
/* fixed music toggle */
.music-btn{position:fixed;bottom:18px;right:18px;z-index:200;width:44px;height:44px;border-radius:50%;border:none;background:rgba(255,255,255,0.85);box-shadow:0 3px 10px rgba(0,0,0,0.18);font-size:1.4rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .15s,background .15s;backdrop-filter:blur(4px);}
.music-btn:hover{transform:scale(1.12);background:rgba(255,255,255,1);}
.world-bg{position:fixed;inset:0;z-index:0;background:linear-gradient(170deg,#c8eeff 0%,#d4f5e2 45%,#fff9d6 100%);overflow:hidden;}
.cloud{position:absolute;background:rgba(255,255,255,0.7);border-radius:50px;animation:drift linear infinite;}
.cloud::before,.cloud::after{content:'';position:absolute;background:inherit;border-radius:50%;}
@keyframes drift{from{transform:translateX(-220px);}to{transform:translateX(110vw);}}
.screen{display:none;position:relative;z-index:1;}
.screen.active{display:flex;flex-direction:column;align-items:center;min-height:100vh;}

/* ── HUB ── */
#hub{padding:0;text-align:center;}
.logo-wrap{margin-bottom:28px;}
.logo-star{font-size:3rem;animation:spin 8s linear infinite;display:inline-block;}
@keyframes spin{to{transform:rotate(360deg);}}
.logo-text{font-family:var(--font-head);font-size:clamp(2.4rem,8vw,4.2rem);color:var(--navy);text-shadow:5px 5px 0 var(--sun),8px 8px 0 rgba(0,0,0,0.08);line-height:1;animation:logoFloat 4s ease-in-out infinite;}
@keyframes logoFloat{0%,100%{transform:translateY(0);}50%{transform:translateY(-8px);}}
.logo-sub{font-size:1rem;color:#5c6bc0;font-weight:700;margin-top:6px;letter-spacing:1px;}
.grade-label{display:inline-block;background:var(--white);border-radius:40px;padding:8px 24px;box-shadow:var(--shadow-sm);font-family:var(--font-head);font-size:1.2rem;color:var(--navy);margin-bottom:8px;}
.global-stars{display:inline-flex;align-items:center;gap:8px;background:var(--white);border-radius:40px;padding:8px 22px;box-shadow:var(--shadow-sm);font-size:1rem;font-weight:800;color:#f57f17;margin-bottom:32px;}
.back-to-grades{display:inline-flex;align-items:center;gap:6px;background:var(--white);border:none;border-radius:30px;padding:8px 20px;font-family:var(--font-body);font-size:.9rem;font-weight:800;color:var(--navy);cursor:pointer;box-shadow:var(--shadow-sm);margin-bottom:24px;transition:transform .1s;text-decoration:none;}
.back-to-grades:hover{transform:scale(1.04);}
.games-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;max-width:960px;width:100%;margin:0 auto;}
.game-card{background:var(--white);border-radius:28px;padding:30px 18px 24px;box-shadow:var(--shadow-lg);cursor:pointer;transition:transform .18s,box-shadow .18s;position:relative;overflow:hidden;}
.game-card::after{content:'';position:absolute;top:0;left:0;right:0;height:9px;border-radius:28px 28px 0 0;}
.game-card:hover{transform:translateY(-8px);box-shadow:0 18px 0 rgba(0,0,0,0.09);}
.card-icon{font-size:3.4rem;display:block;margin-bottom:12px;animation:iconBob 2.5s ease-in-out infinite;}
@keyframes iconBob{0%,100%{transform:scale(1) rotate(-3deg);}50%{transform:scale(1.12) rotate(3deg);}}
.card-name{font-family:var(--font-head);font-size:1.5rem;color:var(--navy);margin-bottom:5px;}
.card-desc{font-size:.88rem;color:#78909c;font-weight:600;line-height:1.5;}
.card-level-pill{display:inline-flex;align-items:center;gap:5px;margin-top:12px;background:#f3e5f5;color:#6a1b9a;padding:5px 14px;border-radius:20px;font-size:.8rem;font-weight:800;}

/* card accent colors */
.accent-blue::after{background:linear-gradient(90deg,var(--sky),var(--mint));}
.accent-coral::after{background:linear-gradient(90deg,var(--coral),var(--peach));}
.accent-purple::after{background:linear-gradient(90deg,var(--purple),var(--rose));}
.accent-green::after{background:linear-gradient(90deg,var(--grass),var(--mint));}
.accent-teal::after{background:linear-gradient(90deg,var(--mint),#1E88E5);}
.accent-indigo::after{background:linear-gradient(90deg,#5C6BC0,var(--purple));}
.accent-gold::after{background:linear-gradient(90deg,#F9A825,var(--coral));}
.accent-navy::after{background:linear-gradient(90deg,var(--navy),#5C6BC0);}
.accent-blue .card-level-pill{background:#e1f5fe;color:#01579b;}
.accent-coral .card-level-pill{background:#fbe9e7;color:#bf360c;}
.accent-purple .card-level-pill{background:#f3e5f5;color:#6a1b9a;}
.accent-green .card-level-pill{background:#e8f5e9;color:#1b5e20;}
.accent-teal .card-level-pill{background:#e0f7fa;color:#006064;}
.accent-indigo .card-level-pill{background:#e8eaf6;color:#1a237e;}
.accent-gold .card-level-pill{background:#fff8e1;color:#e65100;}
.accent-navy .card-level-pill{background:#e8eaf6;color:#1a237e;}

/* ── GAME SHELL ── */
.game-shell{width:100%;max-width:680px;padding:20px 16px 60px;position:relative;}
.top-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;gap:10px;flex-wrap:wrap;position:relative;z-index:10;}
.back-btn{background:var(--white);border:none;border-radius:14px;padding:9px 20px;font-family:var(--font-head);font-size:1rem;color:var(--navy);cursor:pointer;box-shadow:var(--shadow-sm);transition:transform .1s;white-space:nowrap;}
.back-btn:hover{transform:scale(1.05);}
.stats-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap;}
.stat-chip{background:var(--white);border-radius:30px;padding:7px 16px;font-weight:800;font-size:.9rem;color:var(--navy);box-shadow:var(--shadow-sm);display:flex;align-items:center;gap:5px;}
.level-header{text-align:center;margin-bottom:14px;}
.level-badge{display:inline-block;background:linear-gradient(135deg,var(--sun),var(--peach));color:var(--navy);font-family:var(--font-head);font-size:1rem;padding:6px 20px;border-radius:30px;box-shadow:var(--shadow-sm);margin-bottom:6px;}
.game-title{font-family:var(--font-head);font-size:clamp(1.6rem,5vw,2.2rem);color:var(--navy);}
.level-desc{font-size:.9rem;color:#607d8b;font-weight:700;margin-top:4px;}
.prog-wrap{width:100%;height:16px;background:#dee2e6;border-radius:10px;margin-bottom:24px;overflow:hidden;}
.prog-fill{height:100%;border-radius:10px;background:linear-gradient(90deg,#66BB6A,#43A047);transition:width .5s ease;position:relative;}
.prog-fill::after{content:'';position:absolute;top:2px;left:4px;right:4px;height:5px;background:rgba(255,255,255,.35);border-radius:4px;}

/* ── LOADING ── */
.loading-box{background:var(--white);border-radius:var(--radius);padding:48px 32px;box-shadow:var(--shadow-md);text-align:center;width:100%;margin-bottom:22px;}
.loading-spinner{font-size:4rem;display:block;margin-bottom:16px;animation:spinBounce 1.2s ease-in-out infinite;}
@keyframes spinBounce{0%,100%{transform:scale(1) rotate(0deg);}50%{transform:scale(1.2) rotate(180deg);}}
.loading-title{font-family:var(--font-head);font-size:1.8rem;color:var(--navy);margin-bottom:8px;}
.loading-sub{font-size:1rem;color:#78909c;font-weight:600;}
.loading-dots::after{content:'';animation:dots 1.5s steps(4,end) infinite;}
@keyframes dots{0%{content:'';}25%{content:'.';}50%{content:'..';}75%{content:'...';}100%{content:'';}}

/* ── Q BOX ── */
.q-box{background:var(--white);border-radius:var(--radius);padding:28px 32px;box-shadow:var(--shadow-md);text-align:center;width:100%;margin-bottom:22px;}
.q-label{font-size:.8rem;font-weight:800;color:#90a4ae;text-transform:uppercase;letter-spacing:2px;margin-bottom:10px;}
.q-main{font-family:var(--font-head);font-size:clamp(2rem,6vw,3.2rem);color:var(--navy);line-height:1.2;}
.q-sub{font-size:1rem;color:#78909c;font-weight:700;margin-top:6px;}
.ans-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;width:100%;margin-bottom:16px;}
.ans-btn{background:var(--white);border:3px solid #e0e0e0;border-radius:16px;padding:16px 10px;font-family:var(--font-head);font-size:1.2rem;color:var(--navy);cursor:pointer;transition:transform .12s,border-color .15s,background .15s;box-shadow:0 5px 0 #d4d4d4;text-align:center;line-height:1.3;}
.ans-btn:hover:not(:disabled){border-color:var(--sky);transform:translateY(-4px);box-shadow:0 9px 0 #b0bec5;}
.ans-btn.correct{background:#e8f5e9;border-color:#66BB6A;box-shadow:0 5px 0 #388e3c;color:#1b5e20;animation:popIn .35s ease;}
.ans-btn.wrong{background:#fce4ec;border-color:#ef9a9a;box-shadow:0 5px 0 #e57373;color:#b71c1c;animation:shake .4s ease;}
@keyframes popIn{0%{transform:scale(1);}50%{transform:scale(1.1);}100%{transform:scale(1);}}
@keyframes shake{0%,100%{transform:translateX(0);}25%{transform:translateX(-9px);}75%{transform:translateX(9px);}}
.feedback{font-family:var(--font-head);font-size:1.3rem;text-align:center;min-height:36px;margin-bottom:6px;}
.feedback.good{color:#2e7d32;}
.feedback.bad{color:#c62828;}
.next-btn{background:linear-gradient(135deg,#AB47BC,#7B1FA2);color:var(--white);border:none;border-radius:16px;padding:14px 40px;font-family:var(--font-head);font-size:1.3rem;cursor:pointer;box-shadow:0 6px 0 #4a148c;transition:transform .1s;margin-top:8px;}
.next-btn:hover{transform:translateY(-3px);}

/* ── MATH INPUT ── */
.math-eq{font-family:var(--font-head);font-size:clamp(2.2rem,7vw,4rem);color:var(--navy);}
.math-input-row{display:flex;gap:12px;align-items:center;margin-top:18px;flex-wrap:wrap;justify-content:center;}
.math-in{font-family:var(--font-head);font-size:2rem;width:120px;text-align:center;border:3px solid #b0bec5;border-radius:14px;padding:10px;color:var(--navy);outline:none;transition:border-color .2s;}
.math-in:focus{border-color:var(--sky);}
.check-btn{background:linear-gradient(135deg,var(--coral),#d84315);color:var(--white);border:none;border-radius:14px;padding:14px 28px;font-family:var(--font-head);font-size:1.25rem;cursor:pointer;box-shadow:0 6px 0 #bf360c;transition:transform .1s;}
.check-btn:hover{transform:translateY(-3px);}

/* ── SPELLING ── */
.sp-emoji{font-size:4.5rem;display:block;margin-bottom:6px;}
.sp-hint{font-size:1rem;color:#607d8b;font-weight:700;margin-bottom:4px;}
.slots-row{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:14px 0;}
.slot{min-width:48px;height:58px;border-bottom:4px solid var(--navy);font-family:var(--font-head);font-size:1.7rem;color:var(--navy);text-align:center;line-height:58px;transition:all .2s;padding:0 4px;}
.slot.filled{border-color:var(--sky);color:var(--sky);}
.slot.ok{border-color:var(--grass);color:#2e7d32;}
.slot.err{border-color:var(--coral);color:#c62828;}
.tiles-row{display:flex;flex-wrap:wrap;gap:9px;justify-content:center;max-width:460px;margin:0 auto 10px;}
.tile{min-width:48px;height:50px;background:var(--white);border:3px solid #b0bec5;border-radius:12px;box-shadow:0 4px 0 #9e9e9e;font-family:var(--font-head);font-size:1.4rem;color:var(--navy);cursor:pointer;transition:transform .1s,opacity .2s;display:flex;align-items:center;justify-content:center;padding:0 8px;}
.tile:hover:not(.used){transform:translateY(-5px);border-color:var(--purple);}
.tile.used{opacity:.28;pointer-events:none;}
.clear-btn{background:#eceff1;border:2px solid #b0bec5;border-radius:12px;padding:8px 22px;font-family:var(--font-head);font-size:1rem;color:#546e7a;cursor:pointer;transition:transform .1s;margin-top:4px;}
.clear-btn:hover{transform:scale(1.05);}
.hint-btn{background:linear-gradient(135deg,#FFA726,#F57C00);color:var(--white);border:none;border-radius:12px;padding:8px 22px;font-family:var(--font-head);font-size:1rem;cursor:pointer;box-shadow:0 4px 0 #E65100;transition:transform .1s;margin-top:4px;}
.hint-btn:hover{transform:translateY(-2px);}
.hint-btn:disabled{opacity:.45;cursor:default;transform:none;}
.ans-btn.used-hint{opacity:.25;pointer-events:none;}

/* ── SOUND BUTTON ── */
.sound-btn{background:linear-gradient(135deg,var(--sky),#0277BD);color:var(--white);border:none;border-radius:20px;padding:14px 32px;font-family:var(--font-head);font-size:1.3rem;cursor:pointer;box-shadow:0 6px 0 #01579B;transition:transform .1s;display:inline-flex;align-items:center;gap:10px;margin-bottom:12px;}
.sound-btn:hover{transform:translateY(-4px);}

/* ── LEVEL SELECT ── */
#levelSelect{padding:24px 16px 60px;text-align:center;}
.ls-title{font-family:var(--font-head);font-size:clamp(1.7rem,5vw,2.4rem);color:var(--navy);margin-bottom:6px;}
.ls-sub{font-size:.95rem;color:#607d8b;font-weight:700;margin-bottom:28px;}
.levels-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;max-width:540px;width:100%;margin:0 auto 24px;}
.lv-btn{background:var(--white);border:3px solid #e0e0e0;border-radius:16px;padding:14px 8px;font-family:var(--font-head);font-size:1.3rem;color:var(--navy);cursor:pointer;box-shadow:0 5px 0 #d4d4d4;transition:transform .12s;position:relative;}
.lv-btn:hover:not(.locked){transform:translateY(-5px);}
.lv-btn.unlocked{border-color:#66BB6A;box-shadow:0 5px 0 #388e3c;}
.lv-btn.current{background:linear-gradient(135deg,var(--sun),var(--peach));border-color:var(--peach);box-shadow:0 5px 0 #ef6c00;animation:pulse 1.5s ease-in-out infinite;}
@keyframes pulse{0%,100%{transform:scale(1);}50%{transform:scale(1.05);}}
.lv-btn.locked{opacity:.45;cursor:not-allowed;filter:grayscale(.6);}
.lv-stars{font-size:.65rem;position:absolute;bottom:3px;left:50%;transform:translateX(-50%);white-space:nowrap;}
.lv-num{display:block;font-size:1.4rem;}

/* ── RESULT ── */
#result{justify-content:center;}
.result-card{background:var(--white);border-radius:32px;padding:44px 36px;text-align:center;max-width:440px;width:90%;box-shadow:0 14px 0 rgba(0,0,0,0.1);animation:popIn .5s cubic-bezier(.34,1.56,.64,1);}
.res-emoji{font-size:5rem;display:block;margin-bottom:12px;}
.res-title{font-family:var(--font-head);font-size:2.2rem;color:var(--navy);margin-bottom:8px;}
.res-stars{font-size:2.2rem;letter-spacing:4px;margin-bottom:8px;}
.res-score{font-size:1.1rem;font-weight:700;color:#5c6bc0;margin-bottom:6px;}
.res-earned{font-size:.95rem;font-weight:800;color:#f57f17;margin-bottom:24px;}
.res-unlock{background:#e8f5e9;border-radius:12px;padding:10px 18px;font-size:.9rem;font-weight:800;color:#2e7d32;margin-bottom:20px;}
.res-btns{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;}
.btn-again{background:linear-gradient(135deg,#66BB6A,#388e3c);color:var(--white);border:none;border-radius:14px;padding:14px 28px;font-family:var(--font-head);font-size:1.15rem;cursor:pointer;box-shadow:0 6px 0 #1b5e20;transition:transform .1s;}
.btn-again:hover{transform:translateY(-3px);}
.btn-next-lv{background:linear-gradient(135deg,var(--sun),var(--peach));color:var(--navy);border:none;border-radius:14px;padding:14px 28px;font-family:var(--font-head);font-size:1.15rem;cursor:pointer;box-shadow:0 6px 0 #ef6c00;transition:transform .1s;}
.btn-next-lv:hover{transform:translateY(-3px);}
.btn-hub{background:linear-gradient(135deg,var(--sky),#0277BD);color:var(--white);border:none;border-radius:14px;padding:14px 22px;font-family:var(--font-head);font-size:1.05rem;cursor:pointer;box-shadow:0 6px 0 #01579B;transition:transform .1s;}
.btn-hub:hover{transform:translateY(-3px);}

/* ── CONFETTI ── */
.confetti-piece{position:fixed;pointer-events:none;z-index:9999;animation:cfall linear forwards;border-radius:3px;}
@keyframes cfall{0%{transform:translateY(0) rotate(0deg);opacity:1;}100%{transform:translateY(105vh) rotate(800deg);opacity:0;}}

/* ── TIMER ── */
.timer-wrap{display:flex;align-items:center;flex-shrink:0;}
.timer-ring{width:52px;height:52px;position:relative;flex-shrink:0;}
.pause-btn{position:fixed;bottom:18px;right:72px;z-index:200;width:44px;height:44px;border-radius:50%;border:none;background:rgba(255,255,255,0.85);box-shadow:0 3px 10px rgba(0,0,0,0.18);font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .15s,background .15s;backdrop-filter:blur(4px);}
.pause-btn:hover{transform:scale(1.12);background:rgba(255,255,255,1);}
.pause-btn.is-paused{background:rgba(255,213,79,0.92);}
.pause-overlay{display:none;position:absolute;inset:0;z-index:5;background:rgba(232,244,253,0.97);flex-direction:column;align-items:center;justify-content:center;gap:12px;cursor:pointer;border-radius:inherit;}
.game-shell.paused .pause-overlay{display:flex;}
.pause-icon{font-size:7rem;color:#cfd8dc;line-height:1;user-select:none;}
.pause-label{font-family:var(--font-head);font-size:1.3rem;color:#b0bec5;user-select:none;}
.timer-ring svg{transform:rotate(-90deg);}
.timer-ring circle{fill:none;stroke-width:5;}
.timer-bg{stroke:#e0e0e0;}
.timer-fg{stroke:var(--coral);stroke-linecap:round;transition:stroke-dashoffset .9s linear;}
.timer-num{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:var(--font-head);font-size:1.1rem;color:var(--coral);}

/* ── AI BADGE ── */
.ai-badge{display:inline-flex;align-items:center;gap:6px;background:linear-gradient(135deg,#e8d5f5,#d4e8ff);border-radius:20px;padding:4px 12px;font-size:.75rem;font-weight:800;color:#5c35a0;margin-top:6px;}

@media(max-width:520px){
  .ans-grid{grid-template-columns:1fr;}
  .q-box{padding:20px 14px;}
  .res-btns{flex-direction:column;}
  .games-grid{grid-template-columns:1fr 1fr;}
}