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2vw, 2rem);--e-h1:clamp(2rem, 3vw, 3rem);--e-text-hero:clamp(2.6rem, 4.6vw, 4.9rem);--e-text-metric:2rem;--e-text-formula:clamp(2rem, 6vw, 3.5rem);--e-shadow:0 8px 28px #11133f0f;--e-shadow-raised:0 14px 38px #11133f1a;--e-size-touch-min:44px;--e-size-control:48px;--e-sidebar:224px;--e-size-sidebar-compact:80px;--e-container:1280px;--e-size-main-max:1600px;--e-size-logo-min:96px;--e-page-x:clamp(20px, 3vw, 40px);--e-easing:cubic-bezier(.2, .8, .2, 1);--e-hover-lift:3px;--e-max-rotation:2deg;--e-z-nav:20;--e-z-popover:30;--e-z-dialog:50;--e-z-toast:60;--e-duration:var(--e-duration-fast);--e-s-touch:var(--e-size-touch-min)}[data-surface=parent]{--e-heading:var(--e-body);--e-heading-weight:850;--e-h1:clamp(1.75rem, 2.7vw, 2.5rem)}[data-surface=student],[data-surface=marketing]{--e-heading:var(--e-display);--e-heading-weight:650}.e-ai-label{border-radius:var(--e-r-pill);border:1px solid var(--e-color-ai-border);background:var(--e-color-ai-bg);color:var(--e-color-ai-fg);font-size:var(--e-text-xs);white-space:nowrap;align-items:center;gap:6px;padding:4px 10px 4px 8px;font-weight:850;line-height:1.4;display:inline-flex}.e-ai-label .e-icon{width:16px;height:16px;color:var(--e-color-text-link)}.e-ai-note{padding:var(--e-s4);border-radius:var(--e-r-md);background:var(--e-color-ai-bg);color:var(--e-color-ai-fg);font-size:var(--e-text-sm);align-items:flex-start;gap:12px;display:flex}.e-ai-note .e-icon{color:var(--e-color-text-link);margin-top:2px}.e-ai-note p{margin-top:4px}.e-ai-note button{color:var(--e-color-text-link);text-underline-offset:3px;min-height:var(--e-size-touch-min);background:0 0;border:0;margin-top:8px;padding:0;font-weight:850;text-decoration:underline}.e-attempt{border-radius:var(--e-r-pill);font-size:var(--e-text-xs);align-items:center;gap:6px;padding:4px 10px;font-weight:850;line-height:1.4;display:inline-flex}.e-attempt .e-icon{width:16px;height:16px}.e-attempt[data-kind=independent]{background:var(--e-color-attempt-independent-bg);color:var(--e-color-attempt-independent-fg)}.e-attempt[data-kind=assisted]{background:var(--e-color-attempt-assisted-bg);color:var(--e-color-attempt-assisted-fg)}.e-mode-chip{border-radius:var(--e-r-pill);font-weight:850;font-size:var(--e-text-sm);align-items:center;gap:8px;padding:6px 14px;display:inline-flex}.e-mode-chip .e-icon{width:18px;height:18px}.e-mode-chip>span{margin-left:-4px}.e-mode-chip[data-mode=learn]{background:var(--e-color-mode-learn-bg);color:var(--e-color-mode-learn-fg)}.e-mode-chip[data-mode=practice]{background:var(--e-color-mode-practice-bg);color:var(--e-color-mode-practice-fg)}.e-mode-chip[data-mode=check]{background:var(--e-color-mode-check-bg);color:var(--e-color-mode-check-fg)}.e-route{gap:0;margin:0;padding:0;list-style:none;display:grid}.e-route__item{column-gap:var(--e-s4);padding-bottom:var(--e-s6);grid-template-columns:48px minmax(0,1fr);display:grid;position:relative}.e-route__item:last-child{padding-bottom:0}.e-route__item:not(:last-child):before{content:"";border-left:3px dashed var(--e-color-border-control);position:absolute;top:48px;bottom:0;left:23px}.e-route__item[data-state=completed]:not(:last-child):before{border-left-style:solid;border-color:var(--e-color-action-primary)}.e-route__marker{border:2px solid var(--e-color-border-strong);border-radius:50%;place-items:center;width:48px;height:48px;display:grid}.e-route__item[data-state=completed] .e-route__marker{background:var(--e-color-node-done-bg);color:var(--e-color-node-done-fg)}.e-route__item[data-state=current] .e-route__marker{background:var(--e-color-node-current-bg);color:var(--e-color-node-current-fg);border-color:var(--e-color-node-current-bg);box-shadow:0 0 0 4px var(--e-color-bg-subtle)}.e-route__item[data-state=next] .e-route__marker{background:var(--e-color-node-next-bg);color:var(--e-color-node-next-fg)}.e-route__item[data-state=locked] .e-route__marker{background:var(--e-color-node-locked-bg);color:var(--e-color-node-locked-fg);border-style:dashed;border-color:var(--e-color-border-control)}.e-route__body{min-width:0;padding-top:4px}.e-route__body h3{font-size:var(--e-text-lg)}.e-route__body p{color:var(--e-color-text-secondary);font-size:var(--e-text-sm);margin-top:2px}.e-route__state{font-size:var(--e-text-xs);letter-spacing:.04em;text-transform:uppercase;color:var(--e-color-text-secondary);margin-top:8px;font-weight:850;display:inline-block}.e-route__item[data-state=current] .e-route__state{color:var(--e-color-text-link)}.e-route__body .e-button{margin-top:12px}.e-route__item[data-state=current] .e-route__body{background:var(--e-color-bg-surface);border:2px solid var(--e-color-action-primary);border-radius:var(--e-r-md);padding:var(--e-s4)}.e-explain{border-radius:var(--e-r-lg);background:var(--e-color-bg-surface);border:1px solid var(--e-color-border-subtle);padding:var(--e-s6)}.e-explain__head{justify-content:space-between;align-items:center;gap:var(--e-s3);flex-wrap:wrap;display:flex}.e-explain__head h3{font-size:var(--e-h3)}.e-explain__count{font-size:var(--e-text-sm);color:var(--e-color-text-secondary);font-weight:850}.e-explain__stage{justify-content:center;align-items:center;gap:var(--e-s4);min-height:200px;margin-block:var(--e-s5);padding:var(--e-s6) var(--e-s4);border-radius:var(--e-r-md);background:var(--e-color-explain-stage-bg);flex-wrap:wrap;display:flex}.e-explain__op{font-family:var(--e-math);color:var(--e-color-text-primary);font-size:2rem;line-height:1}.e-explain__figure{flex-direction:column;align-items:center;gap:8px;margin:0;display:flex}.e-explain__figure figcaption{font-family:var(--e-math);font-size:1.4rem;line-height:1}.e-explain__caption{font-size:var(--e-text-lg);max-width:60ch;min-height:3em;font-weight:700}.e-explain__controls .e-button{white-space:nowrap}.e-explain__controls{gap:var(--e-s3);margin-top:var(--e-s5);flex-wrap:wrap;justify-content:space-between;align-items:center;display:flex}.e-explain__dots{gap:6px;margin:0;padding:0;list-style:none;display:flex}.e-explain__dots li{background:var(--e-color-bg-accent);border:1px solid var(--e-color-border-control);border-radius:50%;width:10px;height:10px}.e-explain__dots li[aria-current=step]{background:var(--e-color-action-primary);border-color:var(--e-color-action-primary);border-radius:var(--e-r-pill);width:24px}.e-explain__dots li[data-done=true]{background:var(--e-color-action-primary)}.e-fraction-circle{width:var(--e-fraction-size,112px);height:auto;display:block;overflow:visible}.e-fraction-circle .part{fill:var(--e-color-explain-part-empty);stroke:var(--e-color-explain-part-stroke);stroke-width:2px;stroke-linejoin:round}.e-fraction-circle .part[data-filled=true]{fill:var(--e-color-explain-part-filled)}.e-fraction-circle .part[data-added=true]{fill:var(--e-color-explain-part-added)}.e-assist-confirm{border-radius:var(--e-r-lg);padding:var(--e-s5);background:var(--e-color-feedback-warning-bg);color:var(--e-color-text-primary);border:1.5px solid var(--e-color-feedback-warning-fg)}.e-assist-confirm h3{font-size:var(--e-h3);align-items:center;gap:10px;display:flex}.e-assist-confirm p{margin-top:8px}.e-assist-confirm__actions{gap:var(--e-s3);margin-top:var(--e-s4);flex-wrap:wrap;display:flex}.e-barem{gap:var(--e-s4);display:grid}.e-barem__total{flex-wrap:wrap;align-items:baseline;gap:8px;display:flex}.e-barem__total strong{font-family:var(--e-heading);font-size:var(--e-text-metric);font-variant-numeric:tabular-nums;line-height:1.1}.e-barem__table{border-collapse:collapse;width:100%;font-size:var(--e-text-sm)}.e-barem__table caption{text-align:left;margin-bottom:8px;font-weight:850}.e-barem__table th,.e-barem__table td{text-align:left;border-bottom:1px solid var(--e-color-border-subtle);vertical-align:top;padding:10px 8px}.e-barem__table td.e-num,.e-barem__table th.e-num{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}.e-barem__table td small{color:var(--e-color-text-secondary);margin-top:2px;display:block}.e-error-state{border:1.5px solid var(--e-color-feedback-error-fg);padding:var(--e-s6);background:var(--e-color-feedback-error-bg);color:var(--e-color-text-primary);border-radius:20px}.e-error-state h3{color:var(--e-color-feedback-error-fg);align-items:center;gap:10px;display:flex}.e-error-state p{margin:8px 0 16px}@media (width<=767px){.e-explain{padding:var(--e-s4)}.e-explain__stage{gap:var(--e-s2);padding:var(--e-s4) var(--e-s2);min-height:160px}.e-explain__op{font-size:1.5rem}.e-fraction-circle{--e-fraction-size:76px}.e-explain__figure figcaption{font-size:1.15rem}.e-explain__controls .e-button{flex:1}.e-explain__dots{order:-1;justify-content:center;width:100%}}@media (width<=374px){.e-fraction-circle{--e-fraction-size:64px}}body[data-surface=marketing],body[data-surface=student]{--e-heading-weight:700}.e-button{transition:background var(--e-duration), transform var(--e-duration), box-shadow var(--e-duration)}.e-button .e-icon{flex-shrink:0}.e-button:hover{box-shadow:var(--e-shadow)}.e-task__body,.e-card__header>div,.e-page-heading>div{min-width:0}.e-card__header h2{line-height:1.2}.e-range{-webkit-appearance:none;appearance:none;background:0 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.e-marketing-links{gap:clamp(16px,2vw,30px);font-size:.9375rem}body[data-surface=marketing] .e-marketing-links a:not(.e-button){align-items:center;min-height:44px;display:inline-flex}body[data-surface=marketing] .e-marketing-links a:not(.e-button):hover{color:var(--e-color-text-link)}body[data-surface=marketing] .e-marketing-links .e-button{color:var(--e-color-text-on-brand);padding-inline:22px}body[data-surface=marketing] .e-button,body[data-surface=student] .e-button{border-radius:var(--e-r-pill)}body[data-surface=marketing] .e-marketing-footer{min-height:106px;padding-block:26px 32px}body[data-surface=marketing] .e-marketing-footer a{align-items:center;min-height:44px;text-decoration:none;display:inline-flex}body[data-surface=marketing] .e-marketing-footer a:hover{text-decoration:underline}.e-mobile-menu a{min-height:44px;color:var(--e-color-text-primary);align-items:center;font-weight:800;text-decoration:none;display:flex}.auth{isolation:isolate;background:radial-gradient(ellipse at 15% 10%, var(--e-color-bg-subtle), transparent 50%), var(--e-color-bg-page);align-content:center;position:relative}.auth__logo{width:154px}.auth__card{border-radius:var(--e-r-xl);box-shadow:var(--e-shadow-raised);padding:clamp(24px,4vw,36px)}.auth__card h1{font-size:2rem;line-height:1.15}@media (width<=1023px){body[data-surface=marketing] .e-marketing-links{gap:16px;font-size:.8125rem}}@media (width<=767px){body[data-surface=marketing] .e-marketing-nav{min-height:88px}body[data-surface=marketing] .e-marketing-nav .e-logo{width:132px}body[data-surface=marketing] .e-mobile-menu-button{background:0 0;border:0}body[data-surface=marketing] .e-mobile-menu-button .e-icon{width:30px;height:30px}body[data-surface=marketing] .e-marketing-footer{text-align:center;align-items:center;gap:10px}body[data-surface=marketing] .e-marketing-footer>.e-row{flex-direction:column;gap:4px}body[data-surface=marketing] .e-marketing-footer nav{justify-content:center}.auth{align-content:start;padding-top:32px}}