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100% 0%, #ffffff38, transparent 55%), linear-gradient(135deg, var(--hue-a), var(--hue-b));color:#fff;text-shadow:0 1px 2px #00000038}.btn{--btn-bg:var(--surface-2);--btn-fg:var(--text);--btn-edge:var(--border-strong);border-radius:var(--r-md);border:1px solid var(--border);background:var(--btn-bg);min-height:48px;color:var(--btn-fg);font-family:var(--font-display);letter-spacing:-.01em;cursor:pointer;-webkit-user-select:none;user-select:none;box-shadow:0 4px 0 var(--btn-edge), var(--shadow-sm);transition:transform var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out), filter var(--t-fast), opacity var(--t-fast);justify-content:center;align-items:center;gap:8px;padding:12px 22px;font-size:1rem;font-weight:700;display:inline-flex;transform:translateY(0)}.btn:hover{filter:brightness(1.04)}.btn:active{box-shadow:0 1px 0 var(--btn-edge), var(--shadow-sm);transform:translateY(3px)}.btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:0 4px 0 var(--btn-edge);filter:grayscale(.3);transform:none}.btn svg{width:20px;height:20px}.btn-primary{--btn-bg:linear-gradient(180deg, #ffffff38, #fff0 55%), var(--grad-brand);--btn-fg:#fff;--btn-edge:var(--brand-edge);background-size:160% 160%;border-color:#0000}.btn-primary:hover{background-position:100% 0}.btn-teal{--btn-bg:linear-gradient(180deg, #fff3, #fff0 55%), var(--grad-teal);--btn-fg:#fff;--btn-edge:#0c3f63;border-color:#0000}.btn-sun{--btn-bg:linear-gradient(180deg, #ffffff4d, #fff0 55%), var(--grad-sun);--btn-fg:#2a1600;--btn-edge:#a8501b;border-color:#0000}.btn-success{--btn-bg:var(--success);--btn-fg:#fff;--btn-edge:color-mix(in srgb, var(--success) 60%, #000);border-color:#0000}.btn-danger{--btn-bg:var(--danger);--btn-fg:#fff;--btn-edge:color-mix(in srgb, var(--danger) 60%, #000);border-color:#0000}.btn-ghost{--btn-bg:transparent;box-shadow:none;border-color:#0000}.btn-ghost:active{box-shadow:none;transform:scale(.97)}.btn-block{width:100%}.btn-lg{border-radius:var(--r-lg);min-height:58px;padding:14px 28px;font-size:1.1rem}.btn-sm{border-radius:var(--r-sm);min-height:38px;box-shadow:0 3px 0 var(--btn-edge);padding:7px 14px;font-size:.9rem}.icon-btn{border:1px solid var(--border);background:var(--surface-2);cursor:pointer;width:44px;height:44px;transition:transform var(--t-fast) var(--ease-spring), background var(--t-fast);border-radius:14px;place-items:center;display:inline-grid}.icon-btn:hover{background:var(--surface-solid)}.icon-btn:active{transform:scale(.92)}.icon-btn svg{width:20px;height:20px}.icon-btn.speaking{background:color-mix(in srgb, var(--brand) 18%, var(--surface-2));color:var(--brand);animation:1.2s ease-out infinite pulse-ring}.chip{border-radius:var(--r-pill);background:var(--surface-2);border:1px solid var(--border);color:var(--text-2);white-space:nowrap;align-items:center;gap:6px;padding:5px 11px;font-size:.82rem;font-weight:650;display:inline-flex}.chip svg{width:14px;height:14px}.chip.ok{color:var(--success);background:var(--success-bg);border-color:#0000}.chip.warn{color:var(--accent);background:color-mix(in srgb, var(--accent-bright) 16%, transparent);border-color:#0000}.chip.bad{color:var(--danger);background:var(--danger-bg);border-color:#0000}.chip.brand{color:var(--brand);background:color-mix(in srgb, var(--brand) 12%, transparent);border-color:#0000}.dot{width:8px;height:8px;box-shadow:0 0 0 3px color-mix(in srgb, currentColor 22%, transparent);background:currentColor;border-radius:50%}.bar{border-radius:var(--r-pill);background:color-mix(in srgb, var(--text) 9%, transparent);height:12px;overflow:hidden}.bar>span{border-radius:inherit;background:var(--grad-teal);height:100%;transition:width var(--t-slow) var(--ease-out);display:block;position:relative}.bar>span:after{content:"";background:#ffffff73;border-radius:3px;height:3px;position:absolute;inset:2px 6px auto}.bar.brand>span{background:var(--grad-brand)}.bar.sun>span{background:var(--grad-sun)}.stat{gap:2px;display:grid}.stat b{white-space:nowrap;font-family:var(--font-display);letter-spacing:-.03em;font-size:1.7rem;font-weight:780}.stat span{color:var(--muted);font-size:.82rem;font-weight:600}.avatar{background:var(--surface-2);border:2px solid var(--border-strong);border-radius:50%;flex:none;place-items:center;width:44px;height:44px;font-size:1.5rem;display:grid}.avatar.lg{width:76px;height:76px;font-size:2.6rem}.field{gap:6px;display:grid}.field label{font-size:.92rem;font-weight:650}.input{border-radius:var(--r-md);border:1.5px solid var(--border-strong);background:var(--surface-2);width:100%;min-height:50px;transition:border-color var(--t-fast), box-shadow var(--t-fast);padding:12px 16px}.input:focus{border-color:var(--brand);box-shadow:0 0 0 4px color-mix(in srgb, var(--brand) 18%, transparent);outline:none}textarea.input{resize:vertical;min-height:100px}.seg{border-radius:var(--r-md);background:var(--surface);border:1px solid var(--border);flex-wrap:wrap;gap:4px;padding:4px;display:inline-flex}.seg button{cursor:pointer;color:var(--muted);transition:background var(--t-fast), color var(--t-fast);background:0 0;border:0;border-radius:12px;padding:8px 14px;font-weight:650}.seg button[aria-pressed=true]{background:var(--surface-solid);color:var(--text);box-shadow:var(--shadow-sm)}.switch{flex:none;width:52px;height:30px;position:relative}.switch input{opacity:0;cursor:pointer;z-index:1;width:100%;height:100%;margin:0;position:absolute}.switch span{background:color-mix(in srgb, var(--text) 18%, transparent);transition:background var(--t-med);border-radius:30px;position:absolute;inset:0}.switch span:after{content:"";width:24px;height:24px;box-shadow:var(--shadow-sm);transition:transform var(--t-med) var(--ease-spring);background:#fff;border-radius:50%;position:absolute;top:3px;left:3px}.switch input:checked+span{background:var(--brand)}.switch input:checked+span:after{transform:translate(22px)}.switch input:focus-visible+span{outline:3px solid color-mix(in srgb, var(--brand) 60%, transparent);outline-offset:2px}.setting{border-bottom:1px solid var(--border);align-items:center;gap:14px;padding:14px 0;display:flex}.setting:last-child{border-bottom:0}.setting .text{flex:1;gap:2px;display:grid}.setting .text small{color:var(--muted)}.banner{border-radius:var(--r-md);border:1px solid var(--border);background:var(--surface-2);align-items:flex-start;gap:12px;padding:14px 16px;display:flex}.banner svg{flex:none;width:20px;height:20px;margin-top:2px}.banner.info{border-color:color-mix(in srgb, var(--sky) 35%, transparent);background:color-mix(in srgb, var(--sky) 9%, var(--surface-2))}.banner.warn{border-color:color-mix(in srgb, var(--accent-bright) 45%, transparent);background:color-mix(in srgb, var(--accent-bright) 11%, var(--surface-2))}.banner.danger{border-color:color-mix(in srgb, var(--danger) 40%, transparent);background:var(--danger-bg)}.banner.success{border-color:color-mix(in srgb, var(--success) 40%, transparent);background:var(--success-bg)}.empty{text-align:center;justify-items:center;gap:12px;padding:40px 20px;display:grid}.skeleton{border-radius:var(--r-md);background:linear-gradient(90deg, var(--surface) 25%, var(--surface-2) 50%, var(--surface) 75%);background-size:200% 100%;animation:1.4s linear infinite shimmer}.table{border-collapse:collapse;width:100%;font-size:.94rem}.table th{text-align:left;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);padding:10px 12px;font-size:.75rem;font-weight:700}.table td{border-top:1px solid var(--border);vertical-align:middle;padding:12px}.table-wrap{margin:0 -4px;overflow-x:auto}.toast-zone{z-index:80;pointer-events:none;gap:8px;width:min(92vw,420px);display:grid;position:fixed;top:16px;left:50%;translate:-50%}.toast{pointer-events:auto;border-radius:var(--r-md);background:var(--surface-solid);border:1px solid var(--border);box-shadow:var(--shadow-lg);animation:toast-in var(--t-med) var(--ease-spring) both;align-items:center;gap:10px;padding:12px 16px;font-weight:600;display:flex}.overlay{z-index:70;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);animation:fade-in var(--t-med) both;background:#08061e73;place-items:end center;display:grid;position:fixed;inset:0}@media (min-width:700px){.overlay{place-items:center}}.sheet{overscroll-behavior:contain;background:var(--surface-solid);border-radius:var(--r-xl) var(--r-xl) 0 0;width:min(100%,520px);max-height:92dvh;padding:24px 24px max(24px, env(safe-area-inset-bottom,24px));box-shadow:var(--shadow-lg);animation:sheet-in var(--t-slow) var(--ease-out) both;overflow:auto}@media (min-width:700px){.sheet{border-radius:var(--r-xl)}}.mascot{width:var(--size,120px);height:var(--size,120px);flex:none;overflow:visible}.mascot .body{transform-origin:50% 60%;transform-box:fill-box;animation:5s ease-in-out infinite float}.mascot .eye{transform-origin:50%;transform-box:fill-box;animation:5.5s infinite blink}.mascot .ring{transform-origin:60px 60px;animation:14s linear infinite spin}.mascot[data-mood=talking] .mouth{transform-origin:50%;transform-box:fill-box;animation:.28s ease-in-out infinite alternate talk}.mascot[data-mood=happy] .body{animation:hop .7s var(--ease-spring) 2}.mascot[data-mood=thinking] .body{animation:1.6s ease-in-out infinite think}.mascot .wing{transform-origin:30% 20%;transform-box:fill-box;animation:3.2s ease-in-out infinite flap}.mascot .halo{animation:3.5s ease-in-out infinite glow}.unit-head{border-radius:var(--r-lg);color:#fff;align-items:center;gap:14px;padding:18px 20px;display:flex;position:relative;overflow:hidden}.unit-head:after{content:"";background:#ffffff26;border-radius:50%;width:200px;height:200px;position:absolute;top:-60px;right:-40px}.path{justify-items:center;gap:18px;padding:24px 0 8px;display:grid;position:relative}.node-wrap{translate:calc(var(--x,0) * min(1px, max(.3px, (100vw - 200px) / 380))) 0;justify-items:center;gap:8px;display:grid}.node{cursor:pointer;color:#fff;background:linear-gradient(160deg, var(--hue-a), var(--hue-b));width:78px;height:74px;box-shadow:0 7px 0 color-mix(in srgb, var(--hue-b) 55%, #000), var(--shadow-md);will-change:transform;border:0;border-radius:50%;place-items:center;transition:transform .16s cubic-bezier(.34,1.56,.64,1),box-shadow .16s;display:grid;position:relative;transform:translateZ(0)}.node:active{box-shadow:0 2px 0 color-mix(in srgb, var(--hue-b) 55%, #000);transform:translateY(5px)}.node svg{width:30px;height:30px}.node.locked{background:color-mix(in srgb, var(--text) 14%, var(--surface-solid));color:var(--muted);box-shadow:0 7px 0 color-mix(in srgb, var(--text) 22%, transparent)}.node.current:before{content:"";border:3px solid color-mix(in srgb, var(--hue-a) 60%, transparent);border-radius:50%;animation:1.8s ease-out infinite pulse-ring;position:absolute;inset:-10px}.node .stars{filter:drop-shadow(0 1px 1px #0000004d);gap:1px;font-size:.8rem;display:flex;position:absolute;bottom:-10px}.node-label{text-align:center;max-width:150px;font-size:.88rem;font-weight:700;line-height:1.25}.start-bubble{background:var(--surface-solid);border:1px solid var(--border);color:var(--brand);box-shadow:var(--shadow-md);text-transform:uppercase;letter-spacing:.06em;border-radius:12px;padding:6px 12px;font-size:.8rem;font-weight:800;animation:1.6s ease-in-out infinite bob}.player{grid-template-rows:auto 1fr auto;max-width:760px;min-height:100dvh;margin:0 auto;padding:16px;display:grid}.player-top{align-items:center;gap:14px;padding:6px 0 18px;display:flex}.player-top .bar{flex:1;height:16px}.hearts{color:var(--rose);align-items:center;gap:4px;font-weight:800;display:flex}.stage{animation:slide-in var(--t-slow) var(--ease-out) both;align-content:start;gap:22px;padding:8px 0 24px;display:grid}.prompt-title{font-family:var(--font-display);font-size:clamp(1.3rem,3vw,1.7rem);font-weight:750}.options{gap:12px;display:grid}.options.pictures{grid-template-columns:repeat(auto-fit,minmax(min(100%,140px),1fr))}.option{border-radius:var(--r-md);text-align:start;border:2px solid var(--border-strong);background:var(--surface-2);cursor:pointer;min-height:60px;box-shadow:0 4px 0 var(--border-strong);transition:transform var(--t-fast) var(--ease-out), border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);align-items:center;gap:14px;padding:14px 18px;font-size:1.05rem;font-weight:650;display:flex}.option:hover{border-color:color-mix(in srgb, var(--brand) 45%, var(--border-strong))}.option:active{box-shadow:0 1px 0 var(--border-strong);transform:translateY(3px)}.option[aria-pressed=true],.option[aria-checked=true]{border-color:var(--brand);background:color-mix(in srgb, var(--brand) 18%, var(--surface-2));outline:2px solid color-mix(in srgb, var(--brand) 35%, transparent);box-shadow:0 4px 0 color-mix(in srgb, var(--brand) 55%, transparent)}.option.correct{border-color:var(--success);background:var(--success-bg);box-shadow:0 4px 0 color-mix(in srgb, var(--success) 60%, transparent);animation:pop var(--t-med) var(--ease-spring)}.option.wrong{border-color:var(--danger);background:var(--danger-bg);box-shadow:0 4px 0 color-mix(in srgb, var(--danger) 55%, transparent);animation:.4s shake}.option .key{border:1.5px solid var(--border-strong);width:30px;height:30px;color:var(--muted);border-radius:9px;flex:none;place-items:center;font-size:.8rem;display:grid}.option.picture{flex-direction:column;justify-content:center;min-height:150px;font-size:1rem}.option.picture .emoji{transition:transform var(--t-med) var(--ease-spring);font-size:3.6rem;line-height:1}.option.picture:hover .emoji{transform:scale(1.12)rotate(-4deg)}.word-hero{text-align:center;justify-items:center;gap:10px;padding:24px;display:grid}.word-hero .emoji{animation:pop var(--t-slow) var(--ease-spring);font-size:5rem;line-height:1}.word-hero .en{font-family:var(--font-display);letter-spacing:-.03em;font-size:clamp(2rem,6vw,3rem);font-weight:800}.feedback{padding:18px 16px calc(18px + env(safe-area-inset-bottom));border-top:1px solid var(--border);background:color-mix(in srgb, var(--surface-solid) 92%, transparent);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);gap:12px;margin:0 -16px;display:grid;position:sticky;bottom:0}.feedback.good{background:color-mix(in srgb, var(--success) 14%, var(--surface-solid));border-top-color:color-mix(in srgb, var(--success) 40%, transparent);animation:rise var(--t-med) var(--ease-out)}.feedback.bad{background:color-mix(in srgb, var(--danger) 11%, var(--surface-solid));border-top-color:color-mix(in srgb, var(--danger) 35%, transparent);animation:rise var(--t-med) var(--ease-out)}.feedback h3{align-items:center;gap:8px;font-size:1.25rem;display:flex}.feedback.good h3{color:var(--success)}.feedback.bad h3{color:var(--danger)}.bank{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.answer-line{border-bottom:2px dashed var(--border-strong);flex-wrap:wrap;align-content:flex-start;gap:8px;min-height:64px;padding:10px 4px;display:flex}.token{border:2px solid var(--border-strong);background:var(--surface-solid);cursor:pointer;box-shadow:0 3px 0 var(--border-strong);transition:transform var(--t-fast) var(--ease-spring), opacity var(--t-fast);animation:pop var(--t-med) var(--ease-spring);border-radius:14px;padding:10px 16px;font-weight:700}.token:active{box-shadow:0 1px 0 var(--border-strong);transform:translateY(2px)}.token.used{opacity:.25;pointer-events:none;box-shadow:none}.mic{--level:0;cursor:pointer;color:#fff;background:var(--grad-brand);width:104px;height:104px;box-shadow:0 8px 0 var(--brand-edge), var(--glow);transition:transform var(--t-fast) var(--ease-out);border:0;border-radius:50%;place-items:center;display:grid;position:relative}.mic:before{content:"";inset:calc(-8px - var(--level) * 26px);background:color-mix(in srgb, var(--brand) 22%, transparent);z-index:-1;border-radius:50%;transition:inset 80ms linear;position:absolute}.mic:active{box-shadow:0 3px 0 var(--brand-edge), var(--glow);transform:translateY(5px)}.mic svg{width:40px;height:40px}.mic.recording{background:var(--grad-clay);box-shadow:0 8px #8a3020,0 0 40px #c8553d8c}.mic:disabled{opacity:.5;cursor:not-allowed}.word-scores{font-family:var(--font-display);flex-wrap:wrap;justify-content:center;gap:8px;font-size:1.35rem;font-weight:700;display:flex}.word-scores span{border-radius:10px;padding:2px 8px}.word-scores .ok{color:var(--success);background:var(--success-bg)}.word-scores .miss{color:var(--danger);background:var(--danger-bg);text-underline-offset:6px;-webkit-text-decoration:underline wavy;text-decoration:underline wavy}.score-ring{--p:0;background:conic-gradient(var(--success) calc(var(--p) * 1%), color-mix(in srgb, var(--text) 10%, transparent) 0);width:120px;height:120px;animation:pop var(--t-slow) var(--ease-spring);border-radius:50%;place-items:center;display:grid;position:relative}.score-ring:before{content:"";background:var(--surface-solid);border-radius:50%;position:absolute;inset:10px}.score-ring b{font-family:var(--font-display);font-size:2rem;position:relative}.flashcard{perspective:1200px;cursor:pointer;min-height:300px}.flashcard .faces{width:100%;min-height:300px;transform-style:preserve-3d;will-change:transform;transition:transform .38s cubic-bezier(.16,1,.3,1);position:relative;transform:translateZ(0)}.flashcard .faces{width:100%;min-height:300px;transform-style:preserve-3d;transition:transform .7s var(--ease-out);position:relative}.flashcard.flipped .faces{transform:rotateY(180deg)}.flashcard .face{backface-visibility:hidden;text-align:center;border-radius:var(--r-xl);border:1px solid var(--border);background:var(--surface-2);box-shadow:var(--shadow-md);place-items:center;padding:24px;display:grid;position:absolute;inset:0}.flashcard .back{background:linear-gradient(160deg, var(--surface-2), color-mix(in srgb, var(--brand) 10%, var(--surface-2)));transform:rotateY(180deg)}.chat{gap:14px;padding-bottom:8px;display:grid}.bubble{max-width:min(560px,86%);animation:bubble-in var(--t-med) var(--ease-spring) both;box-shadow:var(--shadow-sm);border-radius:20px;padding:14px 16px;line-height:1.5}.bubble.tutor{background:var(--surface-2);border:1px solid 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