*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
    :root{
      --surface:#FFFBF5;--onSurface:#2D3142;--surface2:#F2EAE0;--surface3:#E8DFD3;
      --brand:#20A35B;--brandPink:#FF6B9E;--brandYellow:#FFD166;
      --error:#E74C3C;--border:#E8DFD3;--sidebar-w:260px;
      --glow-gold:rgba(255,209,102,0.6);
    }
    html,body{width:100%;height:100%;overflow:hidden;font-family:'Nunito',sans-serif;background:var(--surface);color:var(--onSurface)}
    #app{display:flex;width:100vw;height:100vh;overflow:hidden}

    #sidebar{width:var(--sidebar-w);flex-shrink:0;background:var(--onSurface);display:flex;flex-direction:column;position:relative;z-index:10}
    .sidebar-brand{padding:28px 24px 20px;border-bottom:1.5px solid rgba(255,255,255,.1)}
    .sidebar-brand-name{font-family:'Fredoka',sans-serif;font-size:28px;font-weight:700;color:#fff;letter-spacing:1px}
    .sidebar-brand-tagline{font-size:12px;color:rgba(255,255,255,.5);font-weight:700;margin-top:2px}
    .sidebar-lang-btn{display:flex;align-items:center;gap:10px;margin:16px 16px 0;background:rgba(255,255,255,.1);border:1.5px solid rgba(255,255,255,.18);padding:10px 14px;border-radius:12px;cursor:pointer;transition:background .15s;color:#fff;font-weight:800;font-size:14px;user-select:none}
    .sidebar-lang-btn:hover{background:rgba(255,255,255,.16)}
    .sidebar-lang-text{flex:1}
    .sidebar-nav{flex:1;padding:20px 12px;overflow-y:auto}
    .sidebar-nav::-webkit-scrollbar{display:none}
    .nav-section-label{font-size:11px;font-weight:900;color:rgba(255,255,255,.35);letter-spacing:1.2px;text-transform:uppercase;padding:0 8px;margin-bottom:8px;margin-top:16px}
    .nav-section-label:first-child{margin-top:0}
    .nav-item{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:12px;cursor:pointer;user-select:none;transition:background .12s,transform .1s;color:rgba(255,255,255,.65);font-weight:800;font-size:14px;margin-bottom:2px}
    .nav-item:hover{background:rgba(255,255,255,.08);color:#fff}
    .nav-item.active{background:rgba(255,255,255,.14);color:#fff}
    .nav-item-icon{width:24px;text-align:center;font-size:20px;line-height:1;flex-shrink:0;transition:transform .2s cubic-bezier(.34,1.56,.64,1)}
    .nav-item:hover .nav-item-icon{transform:scale(1.2)}
    .nav-item-dot{width:6px;height:6px;border-radius:50%;background:var(--brand);margin-left:auto;flex-shrink:0;display:none}
    .nav-item.active .nav-item-dot{display:block}
    .sidebar-footer{padding:16px;border-top:1.5px solid rgba(255,255,255,.1)}
    .progress-nav-btn{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:12px;background:var(--brandYellow);border:2.5px solid rgba(255,255,255,.3);cursor:pointer;transition:transform .12s;font-weight:900;font-size:14px;color:var(--onSurface);user-select:none}
    .progress-nav-btn:hover{transform:scale(1.02)}
    .progress-nav-btn:active{transform:scale(.97)}

    #main{flex:1;position:relative;overflow:hidden}
    #topbar{height:64px;background:var(--surface);border-bottom:1.5px solid var(--border);display:flex;align-items:center;padding:0 32px;gap:16px;position:relative;z-index:5}
    #topbar-back{width:40px;height:40px;border-radius:50%;background:#fff;border:2.5px solid var(--onSurface);display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:18px;font-weight:900;color:var(--onSurface);transition:transform .15s cubic-bezier(.34,1.56,.64,1);user-select:none;flex-shrink:0}
    #topbar-back:hover{transform:scale(1.08)}
    #topbar-back:active{transform:scale(.9)}
    #topbar-back.hidden{visibility:hidden;pointer-events:none}
    #topbar-title{font-family:'Fredoka',sans-serif;font-size:22px;font-weight:600;color:var(--onSurface);flex:1}
    #topbar-welcome{font-size:13px;color:var(--onSurface);opacity:.55;font-weight:700}
    #content-area{position:absolute;top:64px;left:0;right:0;bottom:0;overflow:hidden}

    .screen{position:absolute;inset:0;display:flex;flex-direction:column;background:var(--surface);overflow:hidden}
    .screen.hidden{transform:translateX(100%);opacity:0;pointer-events:none;transition:transform .4s cubic-bezier(.4,0,.2,1),opacity .35s ease}
    .screen.back{transform:translateX(-10%) scale(.97);opacity:0;pointer-events:none;transition:transform .4s cubic-bezier(.4,0,.2,1),opacity .3s ease}
    .screen.active{transform:translateX(0) scale(1);opacity:1;pointer-events:auto;transition:transform .4s cubic-bezier(.4,0,.2,1),opacity .35s ease}
    .scrollable{flex:1;overflow-y:auto;scroll-behavior:smooth}
    .scrollable::-webkit-scrollbar{width:6px}
    .scrollable::-webkit-scrollbar-track{background:transparent}
    .scrollable::-webkit-scrollbar-thumb{background:var(--border);border-radius:999px}
    .btn{cursor:pointer;user-select:none;transition:transform .12s cubic-bezier(.34,1.56,.64,1)}
    .btn:active{transform:scale(.94)}

    .home-content{padding:28px 32px 48px}
    .home-section-title{font-family:'Fredoka',sans-serif;font-size:20px;font-weight:600;color:var(--onSurface);margin-bottom:18px}
    .category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:18px}
    .category-card{border-radius:24px;border:3px solid var(--onSurface);padding:22px 18px 18px;display:flex;flex-direction:column;justify-content:space-between;cursor:pointer;user-select:none;box-shadow:0 6px 0 var(--onSurface);min-height:170px;position:relative;overflow:hidden;animation:cardFloat 6s ease-in-out infinite;animation-play-state:paused;transition:transform .2s cubic-bezier(.34,1.56,.64,1),box-shadow .2s ease}
    .category-card:nth-child(1){animation-delay:0s}.category-card:nth-child(2){animation-delay:-1s}.category-card:nth-child(3){animation-delay:-2s}.category-card:nth-child(4){animation-delay:-3s}.category-card:nth-child(5){animation-delay:-4s}.category-card:nth-child(6){animation-delay:-5s}.category-card:nth-child(7){animation-delay:-5.5s}.category-card:nth-child(8){animation-delay:-6s}.category-card:nth-child(9){animation-delay:-6.5s}.category-card:nth-child(10){animation-delay:-7s}
    .category-card:hover{animation-play-state:running;transform:translateY(-4px) scale(1.02);box-shadow:0 10px 0 var(--onSurface)}
    .category-card:active{transform:scale(.96) translateY(4px);box-shadow:0 2px 0 var(--onSurface);animation-play-state:paused}
    .category-card::after{content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(255,255,255,.15) 0%,transparent 60%);opacity:0;transition:opacity .3s;pointer-events:none}
    .category-card:hover::after{opacity:1}
    .cat-icon{font-size:56px;line-height:1;color:#fff;filter:drop-shadow(2px 2px 0 rgba(0,0,0,.15));transition:transform .25s cubic-bezier(.34,1.56,.64,1)}
    .category-card:hover .cat-icon{transform:scale(1.2) rotate(8deg)}
    .cat-label{font-family:'Fredoka',sans-serif;font-size:22px;font-weight:600;color:#fff;margin-top:14px}

    .chip-bar{display:flex;gap:10px;padding:16px 32px 0;overflow-x:auto;flex-shrink:0}
    .chip-bar::-webkit-scrollbar{display:none}
    .chip{flex-shrink:0;height:40px;padding:0 20px;border-radius:999px;background:#fff;border:2.5px solid var(--onSurface);font-size:14px;font-weight:800;color:var(--onSurface);display:flex;align-items:center;cursor:pointer;user-select:none;transition:transform .15s cubic-bezier(.34,1.56,.64,1),background .15s,color .15s,border-color .15s;white-space:nowrap}
    .chip:hover{background:var(--surface2)}
    .chip:active{transform:scale(.93)}
    .chip.sel{background:var(--brandPink);color:#fff;border-color:var(--brandPink);transform:scale(1.05)}
    .letter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:14px;padding:20px 32px 48px}
    .letter-card{aspect-ratio:1;background:#fff;border-radius:20px;border:3px solid var(--onSurface);display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;user-select:none;box-shadow:0 4px 0 var(--onSurface);transition:transform .2s cubic-bezier(.34,1.56,.64,1),box-shadow .2s ease}
    .letter-card:hover{transform:translateY(-4px) scale(1.05);box-shadow:0 8px 0 var(--onSurface)}
    .letter-card:active{transform:scale(.92) translateY(2px);box-shadow:0 2px 0 var(--onSurface)}
    .letter-big{font-family:'Fredoka',sans-serif;font-size:52px;font-weight:700;color:var(--onSurface);line-height:1;transition:transform .2s}
    .letter-card:hover .letter-big{transform:rotate(-5deg) scale(1.1)}
    .letter-sub{font-size:12px;color:var(--onSurface);opacity:.6;margin-top:6px;font-weight:700}

    .words-content{padding:24px 32px 48px}
    .words-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px}
    .word-card{background:transparent;display:flex;flex-direction:column;align-items:center;gap:10px;cursor:pointer;user-select:none;transition:transform .2s cubic-bezier(.34,1.56,.64,1);opacity:0;animation:staggerIn .45s ease forwards}
    .word-card:hover{transform:translateY(-4px) scale(1.05)}
    .word-card:active{transform:scale(.93) translateY(3px)}
    .word-card-icon{font-size:48px;transition:transform .25s cubic-bezier(.34,1.56,.64,1)}
    .word-card:hover .word-card-icon{transform:scale(1.2) rotate(-8deg)}
    .word-card-label{font-family:'Fredoka',sans-serif;font-size:18px;font-weight:600;color:var(--onSurface);text-align:center}

    .practice-header{display:flex;justify-content:center;padding:24px 32px 12px;border-bottom:1.5px solid var(--border)}
    .practice-layout{display:flex;height:calc(100% - 86px);width:100%}
    .practice-left{width:100%;display:flex;flex-direction:column;padding:32px;overflow-y:auto;align-items:center;justify-content:center}
    .practice-left::-webkit-scrollbar{display:none}
    .practice-right{width:100%;display:flex;flex-direction:column;padding:32px;overflow-y:auto}
    .practice-right::-webkit-scrollbar{display:none}
    .mode-tabs{display:flex;gap:16px;width:100%;max-width:480px}
    .mode-tab{flex:1;height:48px;border-radius:14px;background:#fff;border:2.5px solid var(--onSurface);font-size:15px;font-weight:900;color:var(--onSurface);display:flex;align-items:center;justify-content:center;cursor:pointer;user-select:none;transition:transform .15s cubic-bezier(.34,1.56,.64,1),background .2s,color .2s;box-shadow:0 3px 0 var(--onSurface)}
    .mode-tab:active{transform:scale(.96) translateY(2px);box-shadow:0 1px 0 var(--onSurface)}
    .mode-tab.sel{background:var(--brand);color:#fff}
    .letter-stage-big{display:flex;justify-content:center;align-items:center;margin-bottom:24px;text-align:center;width:100%}
    .big-letter-display{font-family:'Fredoka',sans-serif;font-size:130px;font-weight:700;color:var(--onSurface);line-height:1.1;text-align:center}
    .reveal-row{display:flex;align-items:center;justify-content:center;gap:24px;margin-bottom:20px}
    .reveal-circle{width:150px;height:150px;border-radius:50%;background:#fff;border:3px solid var(--onSurface);display:flex;align-items:center;justify-content:center;box-shadow:0 5px 0 var(--onSurface);transition:transform .5s cubic-bezier(.34,1.56,.64,1),box-shadow .3s;flex-shrink:0}
    .reveal-circle.collapsed{transform:scale(0);box-shadow:0 0 0 var(--onSurface)}
    .reveal-circle.expanded{transform:scale(1);box-shadow:0 5px 0 var(--onSurface),0 0 30px var(--glow-gold)}
    .reveal-icon{font-size:70px;line-height:1}
    .reveal-q{font-size:48px;opacity:.3}
    .reveal-sentence{flex:1;font-size:18px;font-weight:800;color:var(--onSurface);line-height:1.5;max-width:260px;display:none;opacity:0;transition:opacity .4s .2s}
    .reveal-sentence.show{display:block;opacity:1}
    .pr-status-text{font-size:18px;font-weight:800;color:var(--onSurface);text-align:center;min-height:28px;margin-bottom:20px;transition:color .2s}
    .pr-status-text.s-success{color:var(--brand)}
    .pr-status-text.s-retry{color:var(--error)}
    .pr-status-text.s-listen{color:var(--brandPink)}
    .pr-controls{display:flex;gap:28px;justify-content:center}
    .pr-btn{width:100px;height:100px;border-radius:50%;border:3px solid var(--onSurface);display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:36px;cursor:pointer;user-select:none;transition:transform .15s cubic-bezier(.34,1.56,.64,1),box-shadow .15s;box-shadow:0 6px 0 var(--onSurface);gap:4px;position:relative;overflow:hidden}
    .pr-btn-label{font-size:11px;font-weight:900;color:var(--onSurface)}
    .pr-btn:hover{transform:translateY(-3px) scale(1.05);box-shadow:0 9px 0 var(--onSurface)}
    .pr-btn:active{transform:scale(.91) translateY(4px);box-shadow:0 2px 0 var(--onSurface)}
    .pr-btn.speaker{background:var(--brandYellow)}
    .pr-btn.mic{background:var(--brandPink)}
    .pr-btn .ripple{position:absolute;border-radius:50%;background:rgba(255,255,255,.4);transform:scale(0);animation:rippleOut .6s ease-out forwards;pointer-events:none}
    .pr-btn.mic.listening{background:var(--error);animation:micpulse .65s ease-in-out infinite alternate}
    @keyframes micpulse{from{transform:scale(1);box-shadow:0 0 0 0 rgba(231,76,60,.4)}to{transform:scale(1.1);box-shadow:0 0 0 15px rgba(231,76,60,0)}}
    @keyframes rippleOut{to{transform:scale(2.5);opacity:0}}

    .trace-section{display:flex;flex-direction:column;height:100%}
    .trace-label{font-size:16px;font-weight:800;color:var(--onSurface);margin-bottom:14px;text-align:center;min-height:24px;transition:color .3s}
    .trace-label.done{color:var(--brand)}
    .trace-box{flex:1;border-radius:24px;background:#fff;border:3px solid var(--onSurface);position:relative;overflow:hidden;cursor:crosshair;min-height:300px;transition:border-color .3s,box-shadow .3s}
    .trace-box.complete{border-color:var(--brand);box-shadow:0 0 30px rgba(32,163,91,.2)}
    .trace-faded{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:'Fredoka',sans-serif;font-size:260px;font-weight:700;color:rgba(45,49,66,.08);pointer-events:none;user-select:none;transition:opacity .5s}
    .trace-box.complete .trace-faded{opacity:0}
    #trace-canvas-el{position:absolute;inset:0;width:100%;height:100%;touch-action:none}
    .trace-hint{position:absolute;top:14px;left:14px;background:var(--brandYellow);border:2px solid var(--onSurface);padding:6px 14px;border-radius:999px;font-size:12px;font-weight:900;color:var(--onSurface);pointer-events:none;transition:opacity .3s}
    .trace-box.complete .trace-hint{opacity:0}
    .trace-actions{display:flex;justify-content:center;margin-top:16px}
    .clear-btn{padding:11px 28px;border-radius:999px;background:#fff;border:2.5px solid var(--onSurface);font-size:15px;font-weight:900;color:var(--onSurface);font-family:'Nunito',sans-serif;cursor:pointer;user-select:none;transition:transform .15s cubic-bezier(.34,1.56,.64,1);box-shadow:0 3px 0 var(--onSurface)}
    .clear-btn:hover{background:var(--surface2)}
    .clear-btn:active{transform:scale(.95) translateY(2px);box-shadow:0 1px 0 var(--onSurface)}
    .practice-layout.pronounce-mode .practice-right{display:none!important}
    .practice-layout.pronounce-mode .practice-left{display:flex!important}
    .practice-layout.trace-mode .practice-left{display:none!important}
    .practice-layout.trace-mode .practice-right{display:flex!important}
    .practice-layout.trace-mode .trace-box{min-height:60vh}
    #trace-target-canvas{display:none}

    /* ═══ REWARD OVERLAY ═══ */
    #reward-overlay{position:fixed;inset:0;z-index:99999;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.6);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .4s ease,visibility .4s ease}
    #reward-overlay.show{opacity:1;visibility:visible;pointer-events:auto}
    #celebration-canvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:1}
    .reward-content{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;justify-content:center;will-change:transform,opacity}
    .reward-emoji-row{display:flex;gap:8px;margin-bottom:20px;font-size:32px;opacity:0;transform:translateY(10px);transition:opacity .4s .65s,transform .4s .65s cubic-bezier(.34,1.56,.64,1)}
    #reward-overlay.show .reward-emoji-row{opacity:1;transform:translateY(0)}
    .reward-emoji-row span{display:inline-block;opacity:0;transform:scale(0) rotate(-20deg)}
    #reward-overlay.show .reward-emoji-row span{animation:emojiBounce .55s ease-out both}
    .reward-emoji-row span:nth-child(1){animation-delay:.6s}.reward-emoji-row span:nth-child(2){animation-delay:.68s}.reward-emoji-row span:nth-child(3){animation-delay:.76s}.reward-emoji-row span:nth-child(4){animation-delay:.84s}.reward-emoji-row span:nth-child(5){animation-delay:.92s}
    @keyframes emojiBounce{0%{transform:scale(0) rotate(-20deg);opacity:0}55%{transform:scale(1.35) rotate(6deg);opacity:1}100%{transform:scale(1) rotate(0deg);opacity:1}}

    #reward-img-wrap{position:relative;display:flex;align-items:center;justify-content:center;width:300px;height:300px}
    #reward-img-glow{position:absolute;inset:-30px;border-radius:50%;background:radial-gradient(circle,var(--glow-gold) 0%,transparent 70%);opacity:0;pointer-events:none;z-index:0;transition:opacity .6s}
    #reward-overlay.show .reward-animating #reward-img-glow{animation:glowFadeIn .8s .15s ease forwards}
    @keyframes glowFadeIn{0%{opacity:0;transform:scale(.3)}100%{opacity:1;transform:scale(1)}}

    /* KEY: sizing in CSS always, animation via class toggle — never touch inline sizing */
    #reward-img{position:relative;z-index:1;width:auto;max-width:60vw;max-height:65vh;object-fit:contain;border-radius:20px;will-change:transform,opacity;transform:scale(1);opacity:1;transition:none}
    #reward-img.img-hidden{transform:scale(0) rotate(-5deg);opacity:0}
    #reward-overlay.show .reward-animating #reward-img:not(.img-hidden){animation:rewardZoomReveal 1s cubic-bezier(.22,1.3,.36,1) forwards}
    @keyframes rewardZoomReveal{
      0%{transform:scale(0) rotate(-5deg);opacity:0;filter:drop-shadow(0 0 0 transparent)}
      40%{transform:scale(1.35) rotate(1deg);opacity:1;filter:drop-shadow(0 0 40px var(--glow-gold))}
      60%{transform:scale(.92) rotate(-.5deg);opacity:1;filter:drop-shadow(0 0 50px var(--glow-gold))}
      75%{transform:scale(1.06) rotate(.3deg);opacity:1;filter:drop-shadow(0 0 35px var(--glow-gold))}
      88%{transform:scale(.98) rotate(-.1deg);opacity:1;filter:drop-shadow(0 0 30px var(--glow-gold))}
      100%{transform:scale(1) rotate(0deg);opacity:1;filter:drop-shadow(0 0 25px var(--glow-gold))}
    }
    #reward-overlay.show .reward-floating #reward-img:not(.img-hidden){animation:rewardFloat 3s ease-in-out infinite,rewardGlowPulse 2s ease-in-out infinite}
    @keyframes rewardFloat{0%,100%{transform:scale(1) translateY(0)}50%{transform:scale(1) translateY(-12px)}}
    @keyframes rewardGlowPulse{0%,100%{filter:drop-shadow(0 0 25px var(--glow-gold))}50%{filter:drop-shadow(0 0 50px var(--glow-gold))}}

    .reward-word{font-family:'Fredoka',sans-serif;font-size:38px;font-weight:700;color:#fff;margin-bottom:4px;opacity:0;transform:translateY(20px) scale(.9);transition:opacity .5s .9s,transform .5s .9s cubic-bezier(.34,1.56,.64,1);text-shadow:0 3px 15px rgba(0,0,0,.4)}
    #reward-overlay.show .reward-word{opacity:1;transform:translateY(0) scale(1)}
    .reward-msg{font-size:24px;font-weight:900;color:var(--brandYellow);margin-bottom:14px;opacity:0;transform:translateY(15px);transition:opacity .5s 1s,transform .5s 1s cubic-bezier(.34,1.56,.64,1);text-shadow:0 2px 10px rgba(0,0,0,.3)}
    #reward-overlay.show .reward-msg{opacity:1;transform:translateY(0)}
    .reward-tap{font-size:13px;font-weight:700;color:rgba(255,255,255,.4);opacity:0;transition:opacity .5s 1.3s}
    #reward-overlay.show .reward-tap{opacity:1}
    .reward-img-fallback{font-size:130px;line-height:1;color:rgba(255,255,255,.85);display:flex;align-items:center;justify-content:center}

    .reward-balloon{position:absolute;z-index:0;pointer-events:none;opacity:0;will-change:transform,opacity}
    #reward-overlay.show .reward-balloon{animation:balloonRise var(--dur,3s) var(--delay,0s) ease-out forwards}
    @keyframes balloonRise{0%{opacity:0;transform:translateY(80px) scale(.3) rotate(0deg)}12%{opacity:.9}100%{opacity:0;transform:translateY(-110vh) scale(1) rotate(var(--rot,15deg))}}
    .balloon-body{width:var(--size,40px);height:calc(var(--size,40px)*1.2);border-radius:50% 50% 50% 50%/40% 40% 60% 60%;background:var(--clr,#FF6B9E);position:relative;box-shadow:inset -5px -5px 10px rgba(0,0,0,.1),inset 5px 5px 10px rgba(255,255,255,.3)}
    .balloon-body::after{content:'';position:absolute;bottom:-30px;left:50%;width:1.5px;height:30px;background:rgba(255,255,255,.4);transform:translateX(-50%)}
    .balloon-body::before{content:'';position:absolute;top:20%;left:25%;width:30%;height:20%;background:rgba(255,255,255,.35);border-radius:50%;transform:rotate(-20deg)}

    .progress-content{padding:28px 32px 48px}
    .progress-top-row{display:flex;gap:20px;margin-bottom:20px}
    .prog-big-card{border-radius:24px;padding:28px;display:flex;flex-direction:column;align-items:center;border:3px solid var(--onSurface);box-shadow:0 5px 0 var(--onSurface);flex:1;background:#fff;opacity:0;animation:staggerIn .5s ease forwards}
    .prog-big-card:nth-child(2){animation-delay:.1s}
    .prog-big-icon{font-size:52px;color:var(--onSurface)}
    .prog-big-number{font-family:'Fredoka',sans-serif;font-size:72px;font-weight:700;color:var(--onSurface);line-height:1;margin-top:8px}
    .prog-big-lbl{font-size:16px;font-weight:800;color:var(--onSurface);margin-top:6px}
    .prog-bar-card{background:#fff;border-radius:20px;padding:20px;border:3px solid var(--onSurface);box-shadow:0 4px 0 var(--onSurface);margin-bottom:20px;opacity:0;animation:staggerIn .5s .2s ease forwards}
    .prog-bar-head{display:flex;justify-content:space-between;margin-bottom:12px}
    .prog-bar-title{font-size:17px;font-weight:800;color:var(--onSurface)}
    .prog-bar-pct{font-size:17px;font-weight:900;color:var(--brand)}
    .prog-bar-track{height:20px;border-radius:999px;background:var(--surface2);overflow:hidden;border:2px solid var(--onSurface)}
    .prog-bar-fill{height:100%;background:linear-gradient(90deg,var(--brand),#34D399);border-radius:999px;transition:width 1s cubic-bezier(.4,0,.2,1)}
    .prog-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .prog-sec-title{font-family:'Fredoka',sans-serif;font-size:22px;font-weight:600;color:var(--onSurface);margin:24px 0 14px;grid-column:1/-1}
    .prog-cat-row{display:flex;align-items:center;background:#fff;padding:14px;border-radius:16px;border:2px solid var(--border);opacity:0;animation:staggerIn .4s ease forwards}
    .prog-cat-badge{width:52px;height:52px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:26px;color:#fff;border:2px solid var(--onSurface);flex-shrink:0}
    .prog-cat-info{flex:1;margin-left:14px}
    .prog-cat-name{font-size:15px;font-weight:900;color:var(--onSurface)}
    .prog-cat-meta{font-size:12px;color:var(--onSurface);opacity:.6;margin-top:3px;font-weight:700}
    .recent-section{grid-column:1/-1}
    .recent-row{display:flex;align-items:center;background:#fff;padding:14px;border-radius:16px;border:2px solid var(--border);margin-bottom:10px;opacity:0;animation:staggerIn .4s ease forwards}
    .recent-icon{font-size:24px;margin-right:14px}
    .recent-info{flex:1}
    .recent-word{font-size:16px;font-weight:900;color:var(--onSurface)}
    .recent-meta{font-size:12px;color:var(--onSurface);opacity:.6;margin-top:2px}
    .r-tag{font-size:13px;font-weight:900}
    .r-ok{color:var(--brand)}
    .r-bad{color:var(--error)}

    .modal-scrim{position:fixed;inset:0;background:rgba(0,0,0,.48);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .25s ease}
    .modal-scrim.hidden{display:none}
    @keyframes fadeIn{from{opacity:0}to{opacity:1}}
    .modal-card{background:#fff;border-radius:28px;padding:28px;border:3px solid var(--onSurface);width:400px;box-shadow:0 20px 60px rgba(0,0,0,.3);animation:modalIn .3s cubic-bezier(.34,1.56,.64,1)}
    @keyframes modalIn{from{transform:scale(.9) translateY(20px);opacity:0}to{transform:scale(1) translateY(0);opacity:1}}
    .modal-title{font-family:'Fredoka',sans-serif;font-size:26px;font-weight:600;color:var(--onSurface);margin-bottom:16px}
    .lang-row{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-radius:16px;background:var(--surface2);margin-bottom:10px;cursor:pointer;transition:background .15s,transform .15s cubic-bezier(.34,1.56,.64,1)}
    .lang-row:hover{background:var(--surface3);transform:scale(1.02)}
    .lang-row.selected{background:var(--brand)}
    .lang-row.selected .lang-native,.lang-row.selected .lang-lbl{color:#fff;opacity:1}
    .lang-native{font-size:20px;font-weight:800;color:var(--onSurface)}
    .lang-lbl{font-size:14px;color:var(--onSurface);opacity:.6;font-weight:700}

    #hamburger{display:none;width:40px;height:40px;border-radius:10px;background:rgba(255,255,255,.12);border:none;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;flex-shrink:0;transition:background .15s}
    #hamburger:hover{background:rgba(255,255,255,.2)}
    #hamburger span{display:block;width:20px;height:2.5px;background:#fff;border-radius:2px;transition:transform .25s,opacity .25s}
    #hamburger.open span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
    #hamburger.open span:nth-child(2){opacity:0}
    #hamburger.open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
    #drawer-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:200;animation:fadeIn .2s}
    #drawer-overlay.open{display:block}

    #loading-screen{position:fixed;inset:0;z-index:100000;background:linear-gradient(135deg,var(--surface) 0%,var(--surface2) 50%,var(--surface) 100%);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:24px;transition:opacity .5s ease}
    #loading-screen.fade-out{opacity:0;pointer-events:none}
    .loader-logo{font-family:'Fredoka',sans-serif;font-size:42px;font-weight:700;color:var(--onSurface);letter-spacing:2px;animation:loaderPulse 1.5s ease-in-out infinite}
    .loader-subtitle{font-size:14px;font-weight:800;color:var(--onSurface);opacity:.5;margin-top:-12px}
    .loader-letters{display:flex;gap:6px;font-family:'Fredoka',sans-serif;font-size:28px;font-weight:700}
    .loader-letters span{display:inline-block;animation:loaderLetterBounce .8s ease-in-out infinite}
    .loader-letters span:nth-child(1){animation-delay:0s;color:var(--brandPink)}.loader-letters span:nth-child(2){animation-delay:.1s;color:var(--brandYellow)}.loader-letters span:nth-child(3){animation-delay:.2s;color:var(--brand)}.loader-letters span:nth-child(4){animation-delay:.3s;color:#4ECDC4}.loader-letters span:nth-child(5){animation-delay:.4s;color:#A78BFA}.loader-letters span:nth-child(6){animation-delay:.5s;color:#FB923C}
    .loader-bar{width:200px;height:6px;border-radius:999px;background:var(--surface3);overflow:hidden;margin-top:8px}
    .loader-bar-fill{height:100%;width:40%;border-radius:999px;background:linear-gradient(90deg,var(--brandPink),var(--brandYellow),var(--brand));animation:loaderBarMove 1.5s ease-in-out infinite}
    @keyframes loaderPulse{0%,100%{transform:scale(1)}50%{transform:scale(1.03)}}
    @keyframes loaderLetterBounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
    @keyframes loaderBarMove{0%{transform:translateX(-100%)}100%{transform:translateX(350%)}}

    .celebrate-overlay{position:absolute;inset:0;pointer-events:none;overflow:hidden;opacity:0;transition:opacity .3s;z-index:50}
    .celebrate-overlay.active{opacity:1}
    @keyframes celebFall{0%{transform:translateY(-60px) rotate(0deg) scale(.5);opacity:0}10%{opacity:1}100%{transform:translateY(500px) rotate(720deg) scale(1.2);opacity:0}}
    @keyframes staggerIn{from{opacity:0;transform:translateY(16px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}
    @keyframes cardFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
    @keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-8px)}40%{transform:translateX(8px)}60%{transform:translateX(-4px)}80%{transform:translateX(4px)}}
    .reduced-motion *,.reduced-motion *::before,.reduced-motion *::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}

    @media(max-width:768px){
      :root{--sidebar-w:280px}
      #hamburger{display:flex}
      #sidebar{position:fixed;top:0;left:0;height:100%;width:var(--sidebar-w);transform:translateX(-100%);transition:transform .28s cubic-bezier(.4,0,.2,1);z-index:300;box-shadow:4px 0 24px rgba(0,0,0,.35)}
      #sidebar.open{transform:translateX(0)}
      #topbar{padding:0 16px;gap:10px}
      #topbar-welcome{display:none}
      #bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;background:var(--onSurface);z-index:100;border-top:2px solid rgba(255,255,255,.12);padding-bottom:env(safe-area-inset-bottom,0)}
      .bnav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:10px 4px 8px;cursor:pointer;user-select:none;color:rgba(255,255,255,.5);font-size:11px;font-weight:800;gap:3px;transition:color .15s,transform .15s}
      .bnav-item.active{color:#fff}
      .bnav-item:active{transform:scale(.9)}
      .bnav-item .bnav-icon{font-size:22px;line-height:1}
      .bnav-item .bnav-dot{width:5px;height:5px;border-radius:50%;background:var(--brand);display:none;margin-top:2px}
      .bnav-item.active .bnav-dot{display:block}
      #content-area{bottom:60px}
      .category-grid{grid-template-columns:1fr 1fr;gap:12px}
      .home-content{padding:16px 14px 32px}
      .home-section-title{font-size:16px;margin-bottom:12px}
      .letter-grid{grid-template-columns:repeat(auto-fill,minmax(80px,1fr));gap:10px;padding:14px 14px 32px}
      .letter-big{font-size:38px}.letter-sub{font-size:10px}
      .chip-bar{padding:10px 14px 0;gap:8px}.chip{height:34px;padding:0 14px;font-size:13px}
      .words-content{padding:16px 14px 32px}.words-grid{grid-template-columns:1fr 1fr;gap:12px}
      .practice-header{padding:12px 16px}.practice-layout{height:calc(100% - 74px)}
      .practice-left,.practice-right{padding:16px}
      .letter-stage-big{margin-bottom:16px}.big-letter-display{font-size:80px}
      .pr-btn{width:76px;height:76px;font-size:28px}
      .reveal-circle{width:110px;height:110px}.reveal-icon{font-size:52px}
      .mode-tabs{margin-bottom:16px}.mode-tab{height:42px;font-size:14px}.pr-controls{gap:18px}
      .trace-box{min-height:200px}.trace-faded{font-size:160px}
      .progress-content{padding:16px 14px 80px}.progress-top-row{flex-wrap:wrap;gap:12px}.prog-big-number{font-size:54px}.prog-grid{grid-template-columns:1fr;gap:10px}
      .modal-card{width:calc(100% - 32px);max-width:380px}
      #reward-img-wrap{width:220px;height:220px}#reward-img{max-width:70vw;max-height:55vh}.reward-word{font-size:28px}.reward-msg{font-size:18px}
    }
    @media(min-width:769px){#bottom-nav{display:none}}