:root{--color-bg: hsl(240, 20%, 8%);--color-bg-subtle: hsl(240, 18%, 11%);--color-surface: hsl(240, 15%, 13%);--color-surface-hover: hsl(240, 15%, 18%);--color-surface-active: hsl(240, 15%, 22%);--color-text: hsl(240, 20%, 96%);--color-text-muted: hsl(240, 10%, 65%);--color-text-dim: hsl(240, 10%, 55%);--color-border: hsl(240, 10%, 22%);--color-border-subtle: hsl(240, 10%, 16%);--color-primary: hsl(265, 85%, 66%);--color-primary-light: hsl(265, 90%, 75%);--color-primary-dark: hsl(265, 80%, 50%);--color-primary-glow: hsla(265, 85%, 66%, .25);--color-success: hsl(150, 75%, 45%);--color-success-bg: hsla(150, 75%, 45%, .15);--color-success-glow: hsla(150, 75%, 45%, .3);--color-error: hsl(355, 80%, 60%);--color-error-bg: hsla(355, 80%, 60%, .15);--color-error-glow: hsla(355, 80%, 60%, .3);--color-warning: hsl(40, 95%, 55%);--color-warning-bg: hsla(40, 95%, 55%, .15);--color-xp: hsl(45, 100%, 55%);--color-world-1: hsl(180, 75%, 48%);--color-world-1-glow: hsla(180, 75%, 48%, .25);--color-world-1-bg: hsl(180, 70%, 12%);--color-world-2: hsl(35, 95%, 55%);--color-world-2-glow: hsla(35, 95%, 55%, .25);--color-world-2-bg: hsl(35, 90%, 12%);--color-world-3: hsl(150, 65%, 48%);--color-world-3-glow: hsla(150, 65%, 48%, .25);--color-world-3-bg: hsl(150, 60%, 12%);--color-world-4: hsl(335, 80%, 60%);--color-world-4-glow: hsla(335, 80%, 60%, .25);--color-world-4-bg: hsl(335, 70%, 12%);--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-heading: "Outfit", "Inter", sans-serif;--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--radius-xl: 28px;--radius-full: 9999px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 6px 20px rgba(0, 0, 0, .4);--shadow-lg: 0 12px 36px rgba(0, 0, 0, .5);--shadow-glow: 0 0 24px var(--color-primary-glow);--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 12px;--spacing-lg: 16px;--spacing-xl: 24px;--spacing-2xl: 32px;--spacing-3xl: 48px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.16, 1, .3, 1);--transition-bounce: .5s cubic-bezier(.34, 1.56, .64, 1)}[data-theme=light]{--color-bg: hsl(240, 25%, 97%);--color-bg-subtle: hsl(240, 20%, 94%);--color-surface: hsl(240, 20%, 100%);--color-surface-hover: hsl(240, 20%, 95%);--color-surface-active: hsl(240, 20%, 90%);--color-text: hsl(240, 25%, 12%);--color-text-muted: hsl(240, 10%, 40%);--color-text-dim: hsl(240, 10%, 60%);--color-border: hsl(240, 15%, 88%);--color-border-subtle: hsl(240, 15%, 93%);--color-primary: hsl(265, 80%, 58%);--color-primary-light: hsl(265, 85%, 68%);--color-primary-dark: hsl(265, 80%, 45%);--color-primary-glow: hsla(265, 80%, 58%, .2);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .06);--shadow-md: 0 6px 20px rgba(0, 0, 0, .08);--shadow-lg: 0 12px 36px rgba(0, 0, 0, .12)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{min-height:100dvh;font-family:var(--font-family);background-color:var(--color-bg);color:var(--color-text);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;touch-action:manipulation;-webkit-tap-highlight-color:transparent}body{display:flex;flex-direction:column}#app{display:flex;flex-direction:column;min-height:100dvh;width:100%}button,.btn,.card,.key,.nav-item,.pill{user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.glass-card{background:#21212cb3;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border:1px solid hsla(240,15%,30%,.35);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);transition:transform var(--transition-normal),box-shadow var(--transition-normal),border-color var(--transition-normal)}[data-theme=light] .glass-card{background:#ffffffbf;border:1px solid hsla(240,15%,85%,.8);box-shadow:var(--shadow-sm)}.glass-card--interactive{cursor:pointer}.glass-card--interactive:active{transform:scale(.98)}@media(hover:hover){.glass-card--interactive:hover{border-color:var(--color-primary);box-shadow:var(--shadow-glow);transform:translateY(-2px)}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);min-height:48px;padding:var(--spacing-md) var(--spacing-xl);font-family:var(--font-family);font-size:1rem;font-weight:600;border-radius:var(--radius-md);border:none;cursor:pointer;text-decoration:none;touch-action:manipulation;-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none;transition:transform var(--transition-fast),background-color var(--transition-fast),box-shadow var(--transition-fast),border-color var(--transition-fast);outline:none}:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.btn:focus-visible,.mc-btn:focus-visible,.math-keyboard__key:focus-visible,.drag-item:focus-visible{outline:2px solid var(--color-primary-light)!important;outline-offset:2px}.btn:active{transform:scale(.96)}.btn--primary{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;box-shadow:0 4px 16px var(--color-primary-glow)}.btn--primary:hover{box-shadow:0 6px 20px var(--color-primary-glow)}.btn--secondary{background:var(--color-surface);color:var(--color-text);border:1px solid var(--color-border)}.btn--ghost{background:transparent;color:var(--color-text-muted)}.btn--ghost:hover{color:var(--color-text);background:var(--color-surface-hover)}.btn--success{background:linear-gradient(135deg,var(--color-success),hsl(150,75%,35%));color:#fff;box-shadow:0 4px 16px var(--color-success-glow)}.btn--world-1{background:linear-gradient(135deg,var(--color-world-1),hsl(180,80%,35%));color:#fff}.btn--world-2{background:linear-gradient(135deg,var(--color-world-2),hsl(30,95%,45%));color:#fff}.btn--world-3{background:linear-gradient(135deg,var(--color-world-3),hsl(150,70%,35%));color:#fff}.btn--world-4{background:linear-gradient(135deg,var(--color-world-4),hsl(335,80%,45%));color:#fff}.btn--full{width:100%}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.screen{flex:1;display:flex;flex-direction:column;width:100%;max-width:900px;margin:0 auto;padding:env(safe-area-inset-top,var(--spacing-lg)) var(--spacing-xl) env(safe-area-inset-bottom,var(--spacing-lg));animation:fadeIn var(--transition-normal)}.screen--entering{animation:slideInRight var(--transition-normal)}.screen--leaving{animation:slideOutLeft var(--transition-normal)}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(24px)}to{opacity:1;transform:translate(0)}}@keyframes slideOutLeft{0%{opacity:1;transform:translate(0)}to{opacity:0;transform:translate(-24px)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.88)}to{opacity:1;transform:scale(1)}}@keyframes popIn{0%{transform:scale(.5);opacity:0}70%{transform:scale(1.1)}to{transform:scale(1);opacity:1}}@keyframes shake{0%,to{transform:translate(0)}20%,60%{transform:translate(-8px)}40%,80%{transform:translate(8px)}}@keyframes pulseGlow{0%,to{box-shadow:0 0 12px var(--color-primary-glow)}50%{box-shadow:0 0 28px var(--color-primary-glow)}}@keyframes firePulse{0%,to{transform:scale(1);filter:drop-shadow(0 0 4px hsla(35,95%,55%,.4))}50%{transform:scale(1.12);filter:drop-shadow(0 0 12px hsla(35,95%,55%,.8))}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}h1,h2,h3,h4{font-family:var(--font-heading);font-weight:700;line-height:1.2}.text-gradient{background:linear-gradient(135deg,var(--color-primary-light),var(--color-primary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.text-muted{color:var(--color-text-muted)}.text-dim{color:var(--color-text-dim)}.text-center{text-align:center}.katex{font-size:1.28em!important;text-rendering:auto;max-width:100%}.katex-mathml{display:none!important}.katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;padding:.25rem 0;margin:.5em 0!important}.math-display{display:flex;justify-content:center;align-items:center;padding:var(--spacing-md) var(--spacing-lg);font-size:1.4rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);margin:var(--spacing-md) 0;max-width:100%;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch}.math-display-inline{display:block;max-width:100%;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch}.math-inline{max-width:100%;display:inline-block;vertical-align:middle;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch}.katex-display::-webkit-scrollbar,.math-display::-webkit-scrollbar,.math-display-inline::-webkit-scrollbar,.math-inline::-webkit-scrollbar,.world-intro__step-math::-webkit-scrollbar{height:4px}.katex-display::-webkit-scrollbar-track,.math-display::-webkit-scrollbar-track,.math-display-inline::-webkit-scrollbar-track,.math-inline::-webkit-scrollbar-track,.world-intro__step-math::-webkit-scrollbar-track{background:transparent}.katex-display::-webkit-scrollbar-thumb,.math-display::-webkit-scrollbar-thumb,.math-display-inline::-webkit-scrollbar-thumb,.math-inline::-webkit-scrollbar-thumb,.world-intro__step-math::-webkit-scrollbar-thumb{background:#67677e73;border-radius:4px}.flex-row{display:flex;align-items:center}.flex-between{display:flex;align-items:center;justify-content:space-between}.flex-center{display:flex;align-items:center;justify-content:center}.flex-col{display:flex;flex-direction:column}.flex-wrap{flex-wrap:wrap}.gap-xs{gap:var(--spacing-xs)}.gap-sm{gap:var(--spacing-sm)}.gap-md{gap:var(--spacing-md)}.gap-lg{gap:var(--spacing-lg)}.gap-xl{gap:var(--spacing-xl)}.w-full{width:100%}.mt-auto{margin-top:auto}.math-keyboard{display:flex;flex-direction:column;gap:var(--spacing-md);width:100%;max-width:680px;margin:0 auto}.math-keyboard__display-card{min-height:64px;padding:var(--spacing-md) var(--spacing-lg);display:flex;align-items:center;justify-content:center;text-align:center;background:var(--color-surface);border:2px solid var(--color-primary);border-radius:var(--radius-md);font-size:1.5rem}.math-keyboard__placeholder{color:var(--color-text-dim);font-size:1.1rem}.math-keyboard__keys{display:flex;flex-direction:column;gap:8px}.math-keyboard__row{display:flex;gap:8px;justify-content:center}.math-keyboard__key{flex:1;min-height:52px;min-width:48px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);color:var(--color-text);font-size:1.25rem;font-weight:600;display:flex;align-items:center;justify-content:center;cursor:pointer;touch-action:manipulation;transition:transform var(--transition-fast),background-color var(--transition-fast)}.math-keyboard__key:active,.math-keyboard__key--active{transform:scale(.92);background:var(--color-surface-active)}.math-keyboard__key--var{color:var(--color-primary-light);font-style:italic;font-family:serif}.math-keyboard__key--power{color:var(--color-world-4)}.math-keyboard__key--op{background:#2b2b3b80;color:var(--color-world-2)}.math-keyboard__key--action{background:#eb475526;color:var(--color-error)}.math-keyboard__key--submit{flex:2;font-size:1.15rem;min-height:54px}.math-keyboard__key:disabled{opacity:.45;cursor:not-allowed;pointer-events:none;filter:grayscale(.5)}@media(max-width:640px){.math-keyboard{gap:var(--spacing-sm)}.math-keyboard__row{flex-wrap:wrap;gap:6px}.math-keyboard__key{min-width:44px;min-height:48px;font-size:1.15rem;padding:0 4px}.math-keyboard__key--submit{flex:1 1 100%;min-width:100%}}.mc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-md);width:100%}@media(max-width:640px){.mc-grid{grid-template-columns:1fr}}.mc-btn{min-height:72px;padding:var(--spacing-md) var(--spacing-lg);display:flex;align-items:center;gap:var(--spacing-md);text-align:left;border-radius:var(--radius-md);font-size:1.15rem;color:var(--color-text);cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none}.mc-btn__label{display:flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:var(--radius-full);background:var(--color-surface-hover);color:var(--color-text-muted);font-weight:700;font-size:.9rem;flex-shrink:0}.mc-btn__content{flex:1}.mc-btn--correct{background:var(--color-success-bg)!important;border-color:var(--color-success)!important;box-shadow:0 0 20px var(--color-success-glow)!important;transform:scale(1.02)}.mc-btn--correct .mc-btn__label{background:var(--color-success);color:#fff}.mc-btn--wrong{background:var(--color-error-bg)!important;border-color:var(--color-error)!important;animation:shake .4s ease}.mc-btn--should-have-been{border-color:var(--color-success)!important;background:#1dc97314!important}.drag-group{display:flex;flex-direction:column;gap:var(--spacing-lg);width:100%}.drag-group__pool-card{padding:var(--spacing-md);border-style:dashed}.drag-group__pool-title{font-size:.9rem;color:var(--color-text-muted);margin-bottom:var(--spacing-sm)}.drag-group__pool{display:flex;flex-wrap:wrap;gap:10px;min-height:56px;padding:var(--spacing-xs);align-items:center}.drag-item{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;background:var(--color-surface-hover);border:1px solid var(--color-border);border-radius:var(--radius-full);font-size:1.1rem;font-weight:600;cursor:grab;touch-action:none;transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.drag-item:active{cursor:grabbing}.drag-item__handle{opacity:.5;font-size:.85rem}.drag-item--ghost{opacity:.3;background:var(--color-primary-glow)}.drag-item--dragging{transform:scale(1.08);box-shadow:var(--shadow-lg);background:var(--color-primary);color:#fff}.drag-group__zones-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-md)}.drag-group__zone-col{display:flex;flex-direction:column;overflow:hidden;min-height:140px}.drag-group__zone-header{padding:var(--spacing-sm) var(--spacing-md);font-weight:700;font-size:.9rem;text-align:center}.drag-group__zone-body{flex:1;display:flex;flex-wrap:wrap;gap:8px;padding:var(--spacing-md);min-height:80px;align-content:flex-start}.drag-order__list{display:flex;flex-direction:column;gap:10px}.drag-order__item{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg);font-size:1.15rem;cursor:grab}.progress-bar-container{width:100%}.progress-bar-label{font-size:.85rem;color:var(--color-text-muted);margin-bottom:4px}.progress-bar-track{width:100%;background:var(--color-surface-hover);border-radius:var(--radius-full);overflow:hidden}.progress-bar-fill{height:100%;border-radius:var(--radius-full);transition:width var(--transition-normal)}.progress-ring-container{position:relative;display:inline-flex;align-items:center;justify-content:center}.progress-ring-svg{transform:rotate(-90deg)}.progress-ring-bg{fill:transparent;stroke:var(--color-surface-hover)}.progress-ring-circle{fill:transparent;stroke-linecap:round;transition:stroke-dashoffset var(--transition-normal)}.progress-ring-content{position:absolute;font-size:.85rem;font-weight:700}.timer-widget{display:inline-flex;align-items:center}.timer-widget__ring-container{position:relative;display:flex;align-items:center;justify-content:center}.timer-widget__svg{transform:rotate(-90deg)}.timer-widget__bg-circle{fill:transparent;stroke:var(--color-surface-hover);stroke-width:4}.timer-widget__progress-circle{fill:transparent;stroke-width:4;stroke-linecap:round;transition:stroke-dashoffset .8s linear,stroke var(--transition-normal)}.timer-widget__text{position:absolute;font-family:var(--font-heading);font-weight:700;font-size:.85rem}.timer-widget--danger{animation:pulseGlow 1s infinite}.xp-counter{padding:var(--spacing-sm) var(--spacing-lg);display:flex;flex-direction:column;gap:6px;position:relative}.xp-counter__badge{font-size:.8rem;font-weight:600;color:var(--color-primary-light)}.xp-counter__value{font-family:var(--font-heading);font-weight:700;color:var(--color-xp)}.xp-counter__bar-track{height:6px;background:var(--color-surface-hover);border-radius:var(--radius-full);overflow:hidden}.xp-counter__bar-fill{height:100%;background:linear-gradient(90deg,var(--color-primary),var(--color-xp));border-radius:var(--radius-full);transition:width var(--transition-normal)}.xp-float-tag{position:absolute;top:-12px;right:12px;background:var(--color-xp);color:#000;font-weight:800;font-size:.9rem;padding:2px 8px;border-radius:var(--radius-full);animation:slideUp 1.2s forwards;pointer-events:none}.streak-badge{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius-full)}.streak-badge--active .streak-badge__fire{animation:firePulse 2s infinite}.streak-badge__count{font-weight:700;font-size:.95rem}.streak-badge__record{font-size:.7rem;text-transform:uppercase;background:var(--color-warning);color:#000;font-weight:800;padding:1px 6px;border-radius:var(--radius-full)}.hint-panel{display:flex;flex-direction:column;gap:var(--spacing-sm);width:100%}.hint-item{padding:var(--spacing-md);margin-top:var(--spacing-sm);border-left:4px solid var(--color-warning);font-size:1.05rem;animation:slideUp var(--transition-normal)}.hint-panel__mistake{margin-top:var(--spacing-sm);font-size:.9rem;color:var(--color-warning)}.auth-gate{position:fixed;inset:0;background:radial-gradient(circle at center,hsla(265,80%,20%,.4),var(--color-bg) 75%);z-index:1000;padding:var(--spacing-xl);transition:opacity var(--transition-slow)}.auth-gate__card{width:100%;max-width:440px;padding:2.5rem 2rem;animation:scaleIn var(--transition-normal)}.auth-gate__icon{font-size:3rem;margin-bottom:.5rem}.auth-gate__input{width:100%;min-height:52px;padding:0 var(--spacing-lg);background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text);font-size:1.15rem;text-align:center;outline:none;transition:border-color var(--transition-fast)}.auth-gate__input:focus{border-color:var(--color-primary);box-shadow:var(--shadow-glow)}.auth-gate__error{color:var(--color-error);font-weight:600;font-size:.9rem;margin-top:var(--spacing-sm)}.profile-picker{position:fixed;inset:0;background:radial-gradient(circle at center,hsla(265,80%,20%,.4),var(--color-bg) 75%);z-index:1000;padding:var(--spacing-xl);overflow-y:auto;-webkit-overflow-scrolling:touch}.profile-picker__card{width:100%;max-width:520px;padding:2rem 1.5rem;animation:scaleIn var(--transition-normal)}.profile-picker__icon{font-size:3rem;margin-bottom:.5rem}.profile-picker__grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:var(--spacing-md);margin-top:var(--spacing-sm)}.profile-card{position:relative;display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-lg) var(--spacing-sm);border-radius:var(--radius-lg);cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast)}@media(hover:hover){.profile-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-glow)}}.profile-card--selected{transform:scale(.92);opacity:.7}.profile-card__avatar{font-size:2.8rem;line-height:1}.profile-card__name{font-size:.9rem;font-weight:600;color:var(--color-text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}.profile-card:active{transform:scale(.97);transition:transform 80ms ease}.profile-card--new:active{border-color:var(--color-primary);background:var(--color-primary-glow)}.avatar-picker__item:active{transform:scale(.92);border-color:var(--color-primary-light)}.profile-card__sync-code:active{color:var(--color-primary-light);border-color:var(--color-primary)}.profile-picker__touch-hint{display:none;text-align:center;font-size:.78rem;color:var(--color-text-dim);margin-top:var(--spacing-sm);opacity:.7}@media(pointer:coarse){.profile-picker__touch-hint{display:block}}.profile-card--new{border:2px dashed var(--color-border);background:transparent}@media(hover:hover){.profile-card--new:hover{border-color:var(--color-primary);background:var(--color-primary-glow)}}.profile-card--new .profile-card__avatar{font-size:2rem;opacity:.6}.profile-card--new .profile-card__name{color:var(--color-text-muted);font-weight:500}.avatar-picker__grid{display:grid;grid-template-columns:repeat(8,1fr);gap:6px}.avatar-picker__item{width:100%;aspect-ratio:1;border:2px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);font-size:1.5rem;cursor:pointer;transition:all var(--transition-fast);display:flex;align-items:center;justify-content:center}@media(hover:hover){.avatar-picker__item:hover{border-color:var(--color-primary-light);background:var(--color-surface-hover);transform:scale(1.1)}}.avatar-picker__item--selected{border-color:var(--color-primary);background:var(--color-primary-glow);box-shadow:0 0 12px var(--color-primary-glow);transform:scale(1.1)}.profile-create-form__input{width:100%;min-height:50px;padding:0 var(--spacing-lg);background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text);font-size:1.1rem;text-align:center;outline:none;transition:border-color var(--transition-fast)}.profile-create-form__input:focus{border-color:var(--color-primary);box-shadow:var(--shadow-glow)}.profile-create-form__duplicate-warning{font-size:.82rem;color:#f99e1f;background:#ffaa0014;border:1px solid rgba(255,170,0,.2);border-radius:var(--radius-sm);padding:.5rem .75rem;line-height:1.45;text-align:left;animation:fadeIn .2s ease}.profile-delete-overlay{position:fixed;inset:0;background:#0009;z-index:1100;padding:var(--spacing-xl);animation:fadeIn .2s ease}.profile-delete-modal{max-width:380px;width:100%;padding:1.8rem 1.5rem;animation:scaleIn var(--transition-normal)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.profile-action-sheet-overlay{position:fixed;inset:0;background:#00000080;z-index:1100;animation:fadeIn .15s ease}.profile-action-sheet{position:fixed;bottom:0;left:0;right:0;max-width:420px;margin:0 auto;background:var(--color-surface-elevated);border-radius:var(--radius-xl) var(--radius-xl) 0 0;padding:1.2rem 1rem calc(env(safe-area-inset-bottom,0px) + 1rem);z-index:1101;animation:slideUp .25s cubic-bezier(.16,1,.3,1)}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.profile-action-sheet__header{display:flex;align-items:center;gap:var(--spacing-sm);padding-bottom:var(--spacing-md);border-bottom:1px solid var(--color-border);margin-bottom:var(--spacing-md)}.profile-action-sheet__avatar{font-size:2rem}.profile-action-sheet__name{font-weight:700;font-size:1.05rem;color:var(--color-text)}.profile-action-sheet__action{width:100%;padding:.85rem 1rem;border:none;border-radius:var(--radius-md);background:transparent;color:var(--color-error);font-size:1rem;font-weight:600;cursor:pointer;text-align:left;display:flex;align-items:center;gap:var(--spacing-sm);transition:background var(--transition-fast)}.profile-action-sheet__action:hover,.profile-action-sheet__action:active{background:#ff444414}.profile-action-sheet__cancel{width:100%;padding:.75rem;border:none;border-radius:var(--radius-md);background:var(--color-surface);color:var(--color-text-muted);font-size:.9rem;font-weight:600;cursor:pointer;margin-top:var(--spacing-sm);transition:background var(--transition-fast)}.profile-action-sheet__cancel:hover,.profile-action-sheet__cancel:active{background:var(--color-surface-hover)}.delete-confirm-input{width:100%;min-height:44px;padding:0 var(--spacing-md);background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text);font-size:1rem;text-align:center;outline:none;transition:border-color var(--transition-fast)}.delete-confirm-input:focus{border-color:var(--color-error);box-shadow:0 0 0 3px #ff444426}.delete-confirm-input::placeholder{color:var(--color-text-dim);font-size:.85rem}.btn--delete-disabled{opacity:.4;pointer-events:none;filter:grayscale(.5)}@media(max-width:400px){.avatar-picker__grid{grid-template-columns:repeat(4,1fr)}.profile-picker__grid{grid-template-columns:repeat(2,1fr)}}.sync-indicator{width:36px;height:36px;min-height:36px;border-radius:var(--radius-full);background:var(--color-surface);border:1.5px solid var(--color-border);display:flex;align-items:center;justify-content:center;font-size:1rem;cursor:pointer;transition:all var(--transition-fast);-webkit-user-select:none;user-select:none}.sync-indicator:hover{background:var(--color-surface-hover);transform:scale(1.05)}.sync-indicator--synced{border-color:var(--color-success);box-shadow:0 0 8px var(--color-success-glow)}.sync-indicator--syncing{border-color:var(--color-primary);box-shadow:0 0 8px var(--color-primary-glow)}.sync-indicator--syncing span{display:inline-block;animation:syncSpin 1s linear infinite}.sync-indicator--offline{border-color:var(--color-warning);opacity:.8}.sync-indicator--error{border-color:var(--color-error);box-shadow:0 0 8px var(--color-error-glow)}@keyframes syncSpin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.profile-card__sync-code{font-size:.65rem;font-family:SFMono-Regular,Menlo,Monaco,Consolas,monospace;color:var(--color-text-dim);background:#ffffff0a;padding:2px 6px;border-radius:var(--radius-sm);border:1px solid var(--color-border-subtle);margin-top:2px;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;transition:all var(--transition-fast);cursor:pointer}@media(hover:hover){.profile-card__sync-code:hover{color:var(--color-primary-light);border-color:var(--color-primary);background:var(--color-primary-glow)}}.profile-picker__actions{margin-top:var(--spacing-lg);display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm)}.profile-picker__link-btn{background:transparent;border:1.5px dashed var(--color-border);color:var(--color-text-muted);padding:8px 16px;border-radius:var(--radius-md);font-size:.85rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast);display:inline-flex;align-items:center;gap:6px}.profile-picker__link-btn:hover{border-color:var(--color-primary);color:var(--color-primary-light);background:var(--color-primary-glow)}.sync-link-overlay{position:fixed;inset:0;background:#000000a6;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);z-index:1100;padding:var(--spacing-xl);animation:fadeIn .2s ease}.sync-link-modal{max-width:420px;width:100%;padding:2rem 1.6rem;animation:scaleIn var(--transition-normal)}.sync-link-input{width:100%;min-height:48px;padding:0 var(--spacing-md);background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text);font-family:SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:.95rem;text-align:center;outline:none;transition:border-color var(--transition-fast)}.sync-link-input:focus{border-color:var(--color-primary);box-shadow:var(--shadow-glow)}.sync-link-status{min-height:24px;font-size:.85rem;line-height:1.3}.sync-link-status--success{color:var(--color-success);font-weight:600}.sync-link-status--error{color:var(--color-error)}.dashboard__header{padding:var(--spacing-sm) 0;border-bottom:1px solid var(--color-border);gap:var(--spacing-sm)}.dashboard__brand{flex:1;min-width:0}.dashboard__titles{display:flex;flex-direction:column;min-width:0;flex:1}.dashboard__title{font-size:1.8rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.dashboard__subtitle{font-size:.85rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.dashboard__logo-icon{font-size:2.2rem;flex-shrink:0}.dashboard__actions{flex-shrink:0}.dashboard__stats-row{width:100%}.dashboard__xp-container{flex:1}.dashboard__streak-container{flex-shrink:0}.dashboard__section-title{font-size:1.3rem;font-weight:700}.dashboard__worlds-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-lg);padding:4px 2px}@media(max-width:680px){.dashboard__worlds-grid{grid-template-columns:1fr}}.world-card{padding:1.5rem;display:flex;flex-direction:column;gap:var(--spacing-md);position:relative;overflow:hidden;border-left:4px solid var(--world-theme, var(--color-primary))}.world-card__emoji{font-size:2.2rem}.world-card__title{font-size:1.25rem;margin-bottom:4px}.world-card__desc{font-size:.9rem;line-height:1.4}.world-card__footer{margin-top:auto;padding-top:var(--spacing-sm);border-top:1px solid var(--color-border-subtle);font-size:.9rem}.world-card--locked{opacity:.55;filter:grayscale(.8);cursor:not-allowed}.exam-hero-card{padding:1.5rem 2rem;background:linear-gradient(135deg,#370d7380,#730d374d);border:1px solid var(--color-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-glow)}.exam-hero-card__badge{font-size:.75rem;text-transform:uppercase;font-weight:800;color:var(--color-primary-light);letter-spacing:1px;margin-bottom:4px}.exam-hero-card__title{font-size:1.4rem;margin-bottom:4px}.exam-hero-card__desc{font-size:.9rem;max-width:480px}.dashboard__achievements-shelf{padding:var(--spacing-md);overflow:hidden}.achievements-scroll-track{display:flex;gap:var(--spacing-md);overflow-x:auto;padding-bottom:6px;-webkit-overflow-scrolling:touch}.achievement-item{flex:0 0 110px;display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px;padding:10px 8px;border-radius:var(--radius-md);background:var(--color-surface);border:1px solid var(--color-border)}.achievement-item__icon{font-size:1.8rem}.achievement-item__name{font-size:.75rem;font-weight:600;line-height:1.2}.achievement-item--locked{opacity:.4;filter:grayscale(1)}.level-select__header{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) 0;width:100%}.level-select__world-title{justify-content:center;text-align:center;min-width:0}.level-select__world-name{font-size:clamp(1.2rem,3.5vw,1.8rem);line-height:1.2;margin:0;word-break:break-word}.level-select__placeholder{width:80px}.level-select__desc-card{padding:var(--spacing-md) var(--spacing-lg)}@media(max-width:540px){.level-select__header{grid-template-columns:auto 1fr}.level-select__world-title{justify-content:flex-start;text-align:left}.level-select__placeholder,.level-back-text{display:none}.level-select__desc-card{padding:var(--spacing-md)}#replay-intro-btn{width:100%;justify-content:center}}.level-card{padding:1.2rem var(--spacing-lg);display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-md)}.level-card__num{width:44px;height:44px;border-radius:var(--radius-full);background:var(--color-surface-hover);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.1rem;flex-shrink:0}.level-card__num--boss{background:linear-gradient(135deg,var(--color-warning),hsl(35,95%,45%));color:#000;font-size:1.4rem}.level-card--boss{border:2px solid var(--color-warning);box-shadow:0 0 16px #f9b11f33}.level-card__boss-tag{font-size:.7rem;font-weight:800;background:var(--color-warning);color:#000;padding:1px 6px;border-radius:var(--radius-sm)}.level-card__name{font-size:1.15rem}.level-card__desc{font-size:.85rem}.level-card__stars{font-size:1.2rem;letter-spacing:2px}.level-card__score{font-size:.8rem}.level-card--locked{opacity:.5;cursor:not-allowed}.tutorial-card{width:100%;max-width:640px;padding:2.2rem;margin:1.5rem auto}.tutorial-breakdown-item{padding:8px 12px;background:var(--color-surface);border-radius:var(--radius-sm);font-size:.9rem}.tutorial-card__rule{background:var(--color-warning-bg);border-left:4px solid var(--color-warning);padding:10px 14px;border-radius:var(--radius-sm);font-size:.9rem;margin-top:var(--spacing-sm)}.quiz-screen{gap:var(--spacing-md);max-width:760px}.quiz__top-bar{padding:var(--spacing-xs) 0}.quiz__counter{font-weight:700;font-size:1rem}.quiz__question-card{padding:1.5rem;min-height:120px;justify-content:center;transition:transform var(--transition-normal),border-color var(--transition-normal)}.quiz__question-card--correct{border-color:var(--color-success)!important;transform:scale(1.02)}.quiz__question-card--wrong{border-color:var(--color-error)!important;animation:shake .4s ease}.quiz__prompt{font-size:1.15rem;font-weight:500}.quiz__math-slot{margin:var(--spacing-xs) 0;background:transparent;border:none;font-size:1.8rem}.quiz__feedback-banner{padding:12px var(--spacing-lg);border-radius:var(--radius-md);font-weight:700;font-size:1.1rem;animation:popIn var(--transition-normal)}.quiz__feedback-banner--correct{background:var(--color-success-bg);color:var(--color-success);border:1px solid var(--color-success)}.quiz__feedback-banner--wrong{background:var(--color-error-bg);color:var(--color-error);border:1px solid var(--color-error)}.quiz__mistake-card{background:var(--color-surface);border:1px solid hsla(355,80%,60%,.35);border-left:4px solid var(--color-error);border-radius:var(--radius-md);padding:var(--spacing-lg);margin-top:var(--spacing-sm);text-align:left;animation:popIn var(--transition-normal);display:flex;flex-direction:column;gap:var(--spacing-md)}.quiz__mistake-title{font-size:1.05rem;font-weight:700;color:var(--color-text);display:flex;align-items:center;gap:var(--spacing-xs)}.quiz__mistake-trap{background:#f99e1f1a;border:1px solid hsla(35,95%,55%,.3);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-sm);font-size:.9rem;color:var(--color-text);line-height:1.45}.quiz__mistake-solution{background:#1dc9731a;border:1px solid hsla(150,75%,45%,.3);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-sm);font-size:.95rem;color:var(--color-text);line-height:1.45}.results-card{width:100%;max-width:540px;padding:2.5rem 2rem;margin:auto}.results__star{font-size:2.6rem;opacity:.25;transition:transform .4s cubic-bezier(.34,1.56,.64,1),opacity .4s ease}.results__star--earned{opacity:1;transform:scale(1.2)}.results__stat-box{padding:1.2rem 2rem;flex:1}.results__stat-num{font-family:var(--font-heading);font-size:1.8rem;font-weight:800}.results__achievements-box{padding:var(--spacing-md);background:#ffc61a1a;border:1px solid var(--color-xp);border-radius:var(--radius-md)}.results__ach-heading{font-weight:800;color:var(--color-xp);font-size:.9rem;text-transform:uppercase}.results__actions-row{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);width:100%;margin-top:1.5rem}.results__actions-row .btn{flex:1 1 0;min-width:0;padding:.75rem .85rem;font-size:.95rem;white-space:nowrap}@media(max-width:480px){.results-card{padding:1.75rem 1rem}.results__actions-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-sm)}.results__actions-row #results-retry-btn{grid-column:1;width:100%}.results__actions-row #results-next-btn{grid-column:2;width:100%}.results__actions-row #results-home-btn{grid-column:1 / -1;width:100%}}.exam-results__grade-box{width:130px;height:130px;border-radius:var(--radius-full);display:flex;flex-direction:column;align-items:center;justify-content:center;margin:var(--spacing-md) auto;border:4px solid currentColor}.exam-results__grade-num{font-family:var(--font-heading);font-size:3.2rem;font-weight:800;line-height:1}.exam-results__grade-sub{font-size:.8rem;text-transform:uppercase;font-weight:700}.exam-grade--great{color:var(--color-success);box-shadow:0 0 30px var(--color-success-glow)}.exam-grade--pass{color:var(--color-world-1);box-shadow:0 0 24px var(--color-world-1-glow)}.exam-grade--warning{color:var(--color-warning);box-shadow:0 0 24px var(--color-warning-bg)}.exam-grade--fail{color:var(--color-error);box-shadow:0 0 24px var(--color-error-glow)}.exam-mistake-card{padding:var(--spacing-md);border-left:3px solid var(--color-error);background:#eb47550d}.exam-results__actions{display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-sm);width:100%;margin-top:1.25rem}.exam-results__actions .btn{flex:1 1 0;min-width:0;padding:.75rem 1rem;font-size:.95rem;white-space:nowrap}@media(max-width:480px){.exam-results__actions{flex-direction:column-reverse}.exam-results__actions .btn{width:100%}}.quit-modal-overlay{position:fixed;inset:0;background:#000000bf;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);z-index:2000;padding:var(--spacing-lg);animation:fadeIn var(--transition-fast)}.quit-modal-card{width:100%;max-width:440px;padding:2.2rem 2rem;border:1px solid var(--color-border);box-shadow:var(--shadow-lg);animation:scaleIn var(--transition-normal)}.quit-modal-actions{width:100%}@media(max-width:480px){.quit-modal-actions{flex-direction:column-reverse}.quit-modal-actions .btn{width:100%}}.quiz__report-btn{opacity:.7;font-size:1.1rem;transition:opacity var(--transition-fast),transform var(--transition-fast)}.quiz__report-btn:hover{opacity:1;transform:scale(1.1)}@media(max-width:480px){.quiz__report-text{display:none}}.report-modal-overlay{position:fixed;inset:0;background:#000000c7;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);z-index:2000;padding:var(--spacing-lg);overflow-y:auto;-webkit-overflow-scrolling:touch;animation:fadeIn var(--transition-fast)}.report-modal-card{width:100%;max-width:480px;padding:1.8rem 1.6rem;border:1px solid var(--color-border);box-shadow:var(--shadow-lg);animation:scaleIn var(--transition-normal)}.report-options-grid{margin-top:4px}.report-option-label{display:flex;align-items:center;gap:var(--spacing-sm);padding:.65rem .9rem;background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-md);font-size:.92rem;cursor:pointer;-webkit-user-select:none;user-select:none;transition:border-color var(--transition-fast),background var(--transition-fast),transform var(--transition-fast)}.report-option-label:hover{border-color:var(--color-border-hover);background:#9a5eed14}.report-option-label:has(input:checked){border-color:var(--color-primary);background:#9a5eed26;font-weight:600}.report-option-label input[type=radio]{accent-color:var(--color-primary);width:1.15rem;height:1.15rem;cursor:pointer}.report-modal__textarea{width:100%;padding:var(--spacing-sm) var(--spacing-md);background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text);font-family:inherit;font-size:.95rem;resize:vertical;min-height:72px;outline:none;transition:border-color var(--transition-fast)}.report-modal__textarea:focus{border-color:var(--color-primary);box-shadow:var(--shadow-glow)}.cat-mascot{display:flex;align-items:flex-end;gap:var(--spacing-sm);-webkit-user-select:none;user-select:none}.cat-mascot--inline{position:relative;margin:var(--spacing-xs) 0}.cat-mascot--inline .cat-mascot__svg{width:76px;height:76px}.cat-mascot--corner{position:fixed;bottom:24px;right:24px;z-index:1500;flex-direction:row-reverse;animation:sukiSlideIn .35s cubic-bezier(.34,1.56,.64,1) forwards;pointer-events:none}.cat-mascot--corner .cat-mascot__svg{width:68px;height:68px}.cat-mascot--hiding{animation:sukiSlideOut .35s ease forwards}.cat-mascot__avatar-wrap{flex-shrink:0;display:flex;align-items:center;justify-content:center;filter:drop-shadow(0 4px 10px rgba(139,92,246,.35))}.cat-mascot__tail{transform-origin:72px 75px;animation:sukiTailWag 3.2s ease-in-out infinite}.cat-mascot__bubble{background:var(--color-surface);border:1.5px solid var(--color-primary-light);border-radius:var(--radius-lg);padding:10px 16px;max-width:280px;font-size:.92rem;line-height:1.35;color:var(--color-text);box-shadow:0 6px 20px #00000040;position:relative;animation:bubblePop .35s cubic-bezier(.34,1.56,.64,1) forwards}.cat-mascot--inline .cat-mascot__bubble:before{content:"";position:absolute;left:-8px;bottom:16px;width:0;height:0;border-top:7px solid transparent;border-bottom:7px solid transparent;border-right:8px solid var(--color-surface);z-index:2}.cat-mascot--inline .cat-mascot__bubble:after{content:"";position:absolute;left:-10px;bottom:15px;width:0;height:0;border-top:8px solid transparent;border-bottom:8px solid transparent;border-right:10px solid var(--color-primary-light);z-index:1}.cat-mascot--corner .cat-mascot__bubble:before{content:"";position:absolute;right:-8px;bottom:16px;width:0;height:0;border-top:7px solid transparent;border-bottom:7px solid transparent;border-left:8px solid var(--color-surface);z-index:2}.cat-mascot--corner .cat-mascot__bubble:after{content:"";position:absolute;right:-10px;bottom:15px;width:0;height:0;border-top:8px solid transparent;border-bottom:8px solid transparent;border-left:10px solid var(--color-primary-light);z-index:1}@keyframes sukiTailWag{0%,to{transform:rotate(0)}30%{transform:rotate(-12deg)}70%{transform:rotate(14deg)}}@keyframes sukiSlideIn{0%{transform:translateY(80px) scale(.7);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}@keyframes sukiSlideOut{0%{transform:translateY(0) scale(1);opacity:1}to{transform:translateY(80px) scale(.7);opacity:0}}.dashboard__suki-slot{margin:var(--spacing-xs) 0}.dashboard__topics-section{width:100%}.topic-card{border-radius:var(--radius-lg);border:1px solid var(--color-border);overflow:hidden;transition:border-color var(--transition-normal),box-shadow var(--transition-normal);background:var(--color-surface)}.topic-card:hover{border-color:var(--topic-color, var(--color-primary))}.topic-card__header{padding:1.25rem var(--spacing-lg);cursor:pointer;user-select:none;-webkit-user-select:none;min-height:54px;background:transparent;transition:background 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