:root{--color-bg:#071622;--color-surface:#0d2233;--color-primary:#27e7ff;--color-primary-strong:#00c9e8;--color-text:#eafbff;--color-text-muted:#9ac9d2;--color-border:#17394a;--color-success:#1ed7a5;--color-error:#ff6b7a;--color-surface-raised:color-mix(in oklab, var(--color-surface) 95%, var(--color-text));--color-primary-hover:var(--color-primary-strong);--color-primary-pressed:color-mix(in oklab, var(--color-primary) 82%, var(--color-bg));--color-scrim:color-mix(in oklab, var(--color-bg) 72%, transparent);--color-primary-subtle:color-mix(in oklab, var(--color-primary) 10%, transparent);--color-success-subtle:color-mix(in oklab, var(--color-success) 13%, transparent);--color-error-subtle:color-mix(in oklab, var(--color-error) 13%, transparent);--color-focus-ring:var(--color-primary);--color-on-primary:var(--color-bg);--font-sans:ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--text-xs:clamp(.72rem, .7rem + .15vw, .78rem);--text-sm:clamp(.82rem, .79rem + .2vw, .9rem);--text-base:clamp(1rem, .96rem + .25vw, 1.08rem);--text-lg:clamp(1.05rem, 2.5vw, 1.35rem);--text-xl:clamp(1.45rem, 1.2rem + 1.2vw, 1.9rem);--text-2xl:clamp(2.5rem, 10vw, 5rem);--text-3xl:clamp(3.5rem, 17vw, 7.5rem);--leading-tight:.98;--leading-snug:1.2;--leading-normal:1.55;--weight-regular:400;--weight-medium:500;--weight-semibold:650;--weight-bold:700;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-7:1.75rem;--space-8:2rem;--space-9:2.5rem;--space-10:3rem;--radius-sm:.375rem;--radius-md:.65rem;--radius-lg:1rem;--radius-full:999px;--duration-fast:.12s;--duration-base:.18s;--ease-standard:cubic-bezier(.2, 0, 0, 1);--tap-target:44px;--safe-area-top:env(safe-area-inset-top,0px);--safe-area-right:env(safe-area-inset-right,0px);--safe-area-bottom:env(safe-area-inset-bottom,0px);--safe-area-left:env(safe-area-inset-left,0px);color:var(--color-text);background:var(--color-bg);font-family:var(--font-sans);font-synthesis:none;text-rendering:optimizelegibility}*{box-sizing:border-box}html{scroll-behavior:smooth}body{min-width:320px;min-height:100vh;margin:0}a{color:inherit}.skip-link{padding:var(--space-3) var(--space-4);color:var(--color-text);background:var(--color-surface-raised);border:1px solid var(--color-border);border-radius:0 0 var(--radius-md) var(--radius-md);transition:transform var(--duration-base) var(--ease-standard);z-index:1;position:absolute;top:0;left:1rem;transform:translateY(-120%)}.skip-link:focus{transform:translateY(0)}.app-shell{flex-direction:column;width:min(100%,76rem);min-height:100vh;margin:0 auto;padding:1.25rem;display:flex}.site-header,.site-footer{justify-content:space-between;align-items:center;gap:1rem;display:flex}.site-header{padding:.5rem 0 3rem}.brand{letter-spacing:-.02em;align-items:center;gap:.65rem;font-size:1.05rem;font-weight:700;text-decoration:none;display:inline-flex}.brand-mark{object-fit:contain;width:2rem;height:2rem;display:block}.status-label,.site-footer{color:var(--color-text-muted);font-size:var(--text-xs)}.status-label{margin:0}main{flex:1}.hero{max-width:48rem;padding:2.5rem 0 6rem}.eyebrow{color:var(--color-primary);letter-spacing:.12em;text-transform:uppercase;margin:0 0 1rem;font-size:.76rem;font-weight:700}h1,h2,p{margin-top:0}h1,h2{max-width:12ch;color:var(--color-text);font-weight:var(--weight-semibold);letter-spacing:-.06em;line-height:var(--leading-tight);margin-bottom:1.25rem}h1{font-size:var(--text-3xl)}h2{font-size:var(--text-2xl)}.hero-copy{max-width:34rem;color:var(--color-text-muted);font-size:var(--text-lg);line-height:var(--leading-normal)}.hero-actions{align-items:center;gap:var(--space-3);margin-top:var(--space-5);flex-wrap:wrap;display:flex}.button{justify-content:center;align-items:center;gap:var(--space-2);min-height:var(--tap-target);padding:0 var(--space-5);border-radius:var(--radius-full);font:inherit;font-size:var(--text-sm);font-weight:var(--weight-bold);cursor:pointer;transition:background var(--duration-base) var(--ease-standard);border:1px solid #0000;text-decoration:none;display:inline-flex}.button--lg{min-height:max(3.25rem, var(--tap-target));padding:0 var(--space-6);font-size:var(--text-base)}.button--primary{color:var(--color-on-primary);background:var(--color-primary)}.button--primary:hover{background:var(--color-primary-hover)}.button--primary:active{background:var(--color-primary-pressed)}.button--ghost{color:var(--color-text);background:var(--color-surface);border-color:var(--color-border)}.button--ghost:hover{background:var(--color-surface-raised)}.button--destructive{color:var(--color-bg);background:var(--color-error)}.button:disabled{opacity:.5;cursor:not-allowed}.surface{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg)}.surface>:last-child{margin-bottom:0}.surface--pad-4{padding:var(--space-4)}.surface--pad-5{padding:var(--space-5)}.surface--pad-6{padding:var(--space-6)}.shell{flex-direction:column;min-height:100vh;display:flex}.top-bar{align-items:center;gap:var(--space-2);min-height:calc(var(--tap-target) + var(--space-2));padding:calc(var(--safe-area-top) + var(--space-1)) calc(var(--safe-area-right) + var(--space-4)) var(--space-1) calc(var(--safe-area-left) + var(--space-3));border-bottom:1px solid var(--color-border);display:flex}.top-bar__brand{min-width:var(--tap-target);min-height:var(--tap-target);justify-content:center;align-items:center;text-decoration:none;display:inline-flex}.top-bar__title{max-width:none;font-size:var(--text-lg);font-weight:var(--weight-semibold);letter-spacing:-.02em;line-height:var(--leading-snug);margin:0}.shell__main{width:min(100%,40rem);padding:var(--space-5) calc(var(--safe-area-right) + var(--space-4)) var(--space-8) calc(var(--safe-area-left) + var(--space-4));flex:1;margin:0 auto}.screen-note{color:var(--color-text-muted);line-height:var(--leading-normal);margin:0}.screen-note--error{margin-top:var(--space-5);color:var(--color-error)}.screen-actions{margin-top:var(--space-5)}.bottom-nav{padding:var(--space-1) var(--safe-area-right) calc(var(--safe-area-bottom) + var(--space-1)) var(--safe-area-left);background:var(--color-surface);border-top:1px solid var(--color-border);grid-template-columns:repeat(4,1fr);display:grid;position:sticky;bottom:0}.bottom-nav__item{justify-content:center;align-items:center;gap:var(--space-1);min-height:max(var(--tap-target), 3.25rem);border-radius:var(--radius-sm);color:var(--color-text-muted);font-size:var(--text-xs);font-weight:var(--weight-medium);flex-direction:column;text-decoration:none;display:flex}.bottom-nav__item[aria-current=page]{color:var(--color-primary)}.how{border-top:1px solid var(--color-border);padding:1.5rem 0 5rem}.how-grid{gap:var(--space-4);margin-top:var(--space-6);display:grid}.how-card__icon{color:var(--color-text-muted)}.how-card__title{max-width:none;margin:var(--space-3) 0 var(--space-2);font-size:var(--text-lg);font-weight:var(--weight-semibold);letter-spacing:-.02em;line-height:var(--leading-snug)}.how-card__copy{color:var(--color-text-muted);line-height:var(--leading-normal);margin:0}.site-footer{border-top:1px solid var(--color-border);padding:1.25rem 0}.onboarding{width:min(100%,28rem)}.step-header{margin-bottom:var(--space-6)}.step-indicator{color:var(--color-text-muted);font-size:var(--text-xs);font-weight:var(--weight-medium);margin:0}.step-progress{height:.25rem;margin-top:var(--space-2);background:var(--color-border);border-radius:var(--radius-full);overflow:hidden}.step-progress__fill{background:var(--color-primary);border-radius:var(--radius-full);height:100%;transition:width var(--duration-base) var(--ease-standard)}.step-title{max-width:none;margin:0 0 var(--space-4);font-size:var(--text-xl);letter-spacing:-.03em;line-height:var(--leading-snug)}.option-list{gap:var(--space-3);margin-bottom:var(--space-6);display:grid}.selection-card{justify-content:space-between;align-items:center;gap:var(--space-3);width:100%;min-height:var(--tap-target);padding:var(--space-4);color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);font:inherit;text-align:left;cursor:pointer;transition:border-color var(--duration-base) var(--ease-standard), background var(--duration-base) var(--ease-standard);display:flex}.selection-card[aria-checked=true]{background:var(--color-primary-subtle);border-color:var(--color-primary)}.selection-card__title{font-weight:var(--weight-semibold);line-height:var(--leading-snug);display:block}.selection-card__subtitle{margin-top:var(--space-1);color:var(--color-text-muted);font-size:var(--text-sm);line-height:var(--leading-snug);display:block}.selection-card__check{width:1.375rem;height:1.375rem;color:var(--color-on-primary);border:1px solid var(--color-border);border-radius:var(--radius-full);flex-shrink:0;place-items:center;display:grid}.selection-card[aria-checked=true] .selection-card__check{background:var(--color-primary);border-color:var(--color-primary)}.step-actions{justify-content:space-between;gap:var(--space-3);display:flex}.summary{gap:var(--space-4);margin:0;display:grid}.summary dt{color:var(--color-text-muted);font-size:var(--text-xs);font-weight:var(--weight-medium);letter-spacing:.08em;text-transform:uppercase}.summary dd{margin:var(--space-1) 0 0;font-weight:var(--weight-semibold);line-height:var(--leading-snug)}.top-bar__back{min-width:var(--tap-target);min-height:var(--tap-target);color:var(--color-text);border-radius:var(--radius-md);justify-content:center;align-items:center;text-decoration:none;display:inline-flex}.dashboard,.subject{gap:var(--space-6);display:grid}.section-title{max-width:none;margin:0 0 var(--space-3);font-size:var(--text-lg);letter-spacing:-.02em;line-height:var(--leading-snug)}.course-list{gap:var(--space-3);display:grid}.nav-card{justify-content:space-between;align-items:center;gap:var(--space-3);min-height:var(--tap-target);padding:var(--space-4);color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);transition:background var(--duration-base) var(--ease-standard);text-decoration:none;display:flex}.nav-card:hover{background:var(--color-surface-raised)}.nav-card__text{min-width:0}.nav-card__title{font-weight:var(--weight-semibold);line-height:var(--leading-snug);overflow-wrap:break-word;display:block}.nav-card__meta{margin-top:var(--space-1);color:var(--color-text-muted);font-size:var(--text-sm);line-height:var(--leading-snug);display:block}.nav-card__chevron{color:var(--color-text-muted);flex-shrink:0;display:inline-flex}.topic-section{padding:var(--space-5);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg)}.concept-list{gap:var(--space-2);margin:0;padding:0;list-style:none;display:grid}.concept-row{align-items:baseline;gap:var(--space-3);color:var(--color-text-muted);line-height:var(--leading-normal);overflow-wrap:anywhere;display:flex}.concept-row:before{content:"";background:var(--color-border);border-radius:var(--radius-full);flex-shrink:0;width:.375rem;height:.375rem;transform:translateY(-.125rem)}.target-label{margin:0 0 var(--space-2);color:var(--color-text-muted);font-size:var(--text-xs);font-weight:var(--weight-medium);letter-spacing:.08em;text-transform:uppercase}.target-title{max-width:none;margin:0 0 var(--space-2);font-size:var(--text-xl);letter-spacing:-.03em;line-height:var(--leading-snug)}.target-meta{color:var(--color-text-muted);line-height:var(--leading-normal);margin:0}.target-deadline{margin:var(--space-3) 0 0;color:var(--color-primary);font-size:var(--text-sm);font-weight:var(--weight-semibold)}.practice-hub{gap:var(--space-4);display:grid}.chip{padding:var(--space-1) var(--space-3);color:var(--color-text-muted);background:var(--color-surface-raised);border:1px solid var(--color-border);border-radius:var(--radius-full);font-size:var(--text-xs);font-weight:var(--weight-medium);align-items:center;display:inline-flex}.player__bar{align-items:center;gap:var(--space-2);padding:calc(var(--safe-area-top) + var(--space-2)) calc(var(--safe-area-right) + var(--space-4)) var(--space-2) calc(var(--safe-area-left) + var(--space-2));border-bottom:1px solid var(--color-border);display:flex}.player__exit{min-width:var(--tap-target);min-height:var(--tap-target);color:var(--color-text);border-radius:var(--radius-md);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;padding:0;display:inline-flex}.player__progress{flex:1}.player__main{align-content:start;gap:var(--space-5);display:grid}.stimulus__head{align-items:center;gap:var(--space-2) var(--space-3);margin-bottom:var(--space-3);flex-wrap:wrap;display:flex}.stimulus__title{max-width:none;font-size:var(--text-base);font-weight:var(--weight-semibold);letter-spacing:-.01em;line-height:var(--leading-snug);margin:0}.stimulus__text{max-width:34rem;margin:0 0 var(--space-3);line-height:var(--leading-normal)}.rich-text__math--display{max-width:100%;margin:var(--space-3) 0;display:block;overflow-x:auto}.player__visual{color:var(--color-text-muted);justify-content:center;display:flex}.player__visual svg{max-width:100%;height:auto}.player__stem{font-size:var(--text-lg);font-weight:var(--weight-semibold);letter-spacing:-.02em;line-height:var(--leading-snug)}.player__stem p{max-width:none;margin:0 0 var(--space-2)}.player__stem p:last-child{margin-bottom:0}.player__stem .rich-blocks__table{font-size:var(--text-sm);font-weight:var(--weight-regular);letter-spacing:normal}.visually-hidden{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.player__alternatives{gap:var(--space-3);display:grid}.alt-card{justify-content:flex-start}.alt-card:disabled{cursor:default}.alt-card__letter{width:1.75rem;height:1.75rem;color:var(--color-text-muted);border:1px solid var(--color-border);border-radius:var(--radius-full);font-size:var(--text-xs);font-weight:var(--weight-bold);flex-shrink:0;place-items:center;display:grid}.selection-card[aria-checked=true] .alt-card__letter{color:var(--color-primary);border-color:var(--color-primary)}.alt-card__content{min-width:0;line-height:var(--leading-snug);overflow-wrap:anywhere;flex:1}.selection-card.alt-card--correct,.selection-card.alt-card--correct .alt-card__letter{color:var(--color-success);border-color:var(--color-success)}.selection-card.alt-card--correct{color:var(--color-text);background:var(--color-success-subtle)}.selection-card.alt-card--incorrect,.selection-card.alt-card--incorrect .alt-card__letter{color:var(--color-error);border-color:var(--color-error)}.selection-card.alt-card--incorrect{color:var(--color-text);background:var(--color-error-subtle)}.selection-card.alt-card--muted{opacity:.55}.alt-card__mark{flex-shrink:0;display:inline-flex}.alt-card__mark svg{width:1.05rem;height:1.05rem}.alt-card__mark--correct{color:var(--color-success)}.alt-card__mark--incorrect{color:var(--color-error)}.player__feedback:empty{display:none}.player__banner{padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);font-weight:var(--weight-bold);border:1px solid;margin:0}.player__banner--correct{color:var(--color-success);background:var(--color-success-subtle);border-color:var(--color-success)}.player__banner--incorrect{color:var(--color-error);background:var(--color-error-subtle);border-color:var(--color-error)}.player__explanation-title{margin:0 0 var(--space-2);font-size:var(--text-sm);font-weight:var(--weight-semibold)}.player__explanation{color:var(--color-text-muted);line-height:var(--leading-normal)}.explanation__label{margin:var(--space-4) 0 var(--space-1);color:var(--color-text);font-weight:var(--weight-semibold)}.explanation__label:first-child{margin-top:0}.explanation__text{margin:0 0 var(--space-2)}.explanation__text:last-child{margin-bottom:0}.rich-blocks__list{margin:0 0 var(--space-2);padding-left:var(--space-5)}.rich-blocks__list:last-child{margin-bottom:0}.rich-blocks__list li+li{margin-top:var(--space-1)}.rich-blocks__table{max-width:100%;margin:0 0 var(--space-2);overflow-x:auto}.rich-blocks__table:last-child{margin-bottom:0}.rich-blocks__table table{border-collapse:collapse;line-height:var(--leading-normal)}.rich-blocks__table th,.rich-blocks__table td{padding:var(--space-1) var(--space-3);border:1px solid var(--color-border);text-align:left;vertical-align:top}.rich-blocks__table th{font-weight:var(--weight-semibold);background:var(--color-surface)}.player__actions{padding:var(--space-3) calc(var(--safe-area-right) + var(--space-4)) calc(var(--safe-area-bottom) + var(--space-3)) calc(var(--safe-area-left) + var(--space-4));background:var(--color-bg);border-top:1px solid var(--color-border);display:grid;position:sticky;bottom:0}.player__actions .button{justify-self:center;width:100%;max-width:40rem}.empty-state__icon{margin-bottom:var(--space-3);color:var(--color-text-muted)}.empty-state--error .empty-state__icon{color:var(--color-error)}.empty-state__title{max-width:none;margin:0 0 var(--space-2);font-size:var(--text-xl);letter-spacing:-.03em;line-height:var(--leading-snug)}.empty-state__actions{gap:var(--space-3);margin-top:var(--space-5);display:grid}.results__headline{max-width:none;margin:0 0 var(--space-2);font-size:var(--text-lg);letter-spacing:-.02em;line-height:var(--leading-snug)}.results__count{font-size:var(--text-2xl);font-weight:var(--weight-semibold);letter-spacing:-.04em;line-height:var(--leading-tight)}.results__bar{margin-top:var(--space-4)}.results-list{gap:var(--space-3);margin:0;padding:0;list-style:none;display:grid}.results-row{gap:var(--space-3);padding:var(--space-4);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);display:flex}.results-row__mark{border-radius:var(--radius-full);flex-shrink:0;place-items:center;width:1.75rem;height:1.75rem;display:grid}.results-row__mark svg{width:1.05rem;height:1.05rem}.results-row__mark--correct{color:var(--color-success);background:var(--color-success-subtle)}.results-row__mark--incorrect{color:var(--color-error);background:var(--color-error-subtle)}.results-row__text{min-width:0}.results-row__stem{line-height:var(--leading-snug);-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;margin:0;display:-webkit-box;overflow:hidden}.results-row__answer{margin:var(--space-1) 0 0;color:var(--color-text-muted);font-size:var(--text-sm);line-height:var(--leading-snug);overflow-wrap:anywhere}.review,.profile{gap:var(--space-5);display:grid}.card-head{align-items:center;gap:var(--space-2) var(--space-3);margin-bottom:var(--space-2);flex-wrap:wrap;display:flex}.card-head__title{max-width:none;font-size:var(--text-lg);letter-spacing:-.02em;line-height:var(--leading-snug);margin:0}.app-info{color:var(--color-text-muted);font-size:var(--text-xs);margin:0}.player-done__actions{gap:var(--space-3);margin-top:var(--space-5);display:grid}:focus-visible{outline:3px solid var(--color-focus-ring);outline-offset:3px}@media (width>=48rem){.app-shell{padding:1.75rem 3rem}.site-header{padding-bottom:5rem}.hero{padding-bottom:10rem}.landing-main{width:min(100%,40rem);margin-inline:auto}.bottom-nav{grid-template-columns:repeat(4,minmax(0,9rem));justify-content:center}.course-list{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.skip-link,.button{transition:none}}
/*$vite$:1*/