@layer tokens, reset, primitives, components, utilities;@layer tokens{:root{--cream:#fffdf8;--surface:#ffffff;--ink:#1a1714;--stone:#625d56;--line-soft:#ebe5da;--line-strong:#d9d1c3;--receipt:#f7f3ec;--fox:#ff6b2b;--fox-deep:#cd4a11;--fox-text:#c2410b;--fox-tint:#fff1e5;--moss:#1c9a55;--moss-deep:#17774a;--moss-tint:#e2f6ea;--clay:#d6343b;--clay-deep:#a8262c;--clay-tint:#ffebea;--gold:#ffb01f;--gold-deep:#8a5a00;--gold-tint:#fff5d9;--sky:#1f6fe0;--sky-deep:#1b5fc7;--sky-tint:#e8f1ff;--font-display:var(--next-font-display),"Bricolage Grotesque",sans-serif;--font-body:var(--next-font-body),"Instrument Sans",sans-serif;--font-mono:var(--next-font-mono),"JetBrains Mono",monospace;--border:2px solid var(--ink);--border-soft:2px solid var(--line-soft);--radius-card:20px;--radius-inner:14px;--radius-btn:16px;--radius-pill:999px;--depth-soft:0 3px 0 var(--line-strong);--depth-ink:0 4px 0 var(--ink);--shadow-card:3px 3px 0 var(--ink);--shadow-hero:5px 5px 0 var(--ink);--speed-tap:120ms;--speed-move:200ms;--ease-spring:cubic-bezier(0.2,0.9,0.3,1.2);--ease-out:cubic-bezier(0.2,0.7,0.3,1);--bp-lap:900px;--sidebar-w:236px;--tabbar-h:64px;--measure-app:1100px;--measure-read:720px;--measure-run:720px;--measure-brief:60ch;--gap-col:1.1rem}@keyframes foxspin{to{transform:rotate(1turn)}}@keyframes foxpulse{0%,to{opacity:.35}50%{opacity:1}}@keyframes skeletonpulse{0%,to{opacity:.55}50%{opacity:1}}@keyframes fox-bob{0%,to{transform:translateY(0)}50%{transform:translateY(-3%)}}@keyframes fox-blink{0%,92%,to{transform:scaleY(1)}95%{transform:scaleY(.1)}}@keyframes fox-hop{0%{transform:translateY(0) scale(1)}30%{transform:translateY(-14%) scale(1.04,.96)}55%{transform:translateY(0) scale(.97,1.03)}75%{transform:translateY(-4%)}to{transform:translateY(0)}}@keyframes fox-shake{0%,to{transform:rotate(0)}20%{transform:rotate(-7deg)}40%{transform:rotate(6deg)}60%{transform:rotate(-4deg)}80%{transform:rotate(2deg)}}@keyframes fox-wag{0%,to{transform:rotate(0)}50%{transform:rotate(-12deg)}}@keyframes fox-pop{0%{transform:scale(.6);opacity:0}60%{transform:scale(1.08);opacity:1}to{transform:scale(1)}}@keyframes sheet-up{0%{transform:translateY(100%)}to{transform:translateY(0)}}@keyframes rise{0%{transform:translateY(12px);opacity:0}to{transform:none;opacity:1}}@keyframes wiggle{0%,to{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}@keyframes flicker{0%,to{transform:scale(1) rotate(0)}50%{transform:scale(1.08) rotate(-4deg)}}@keyframes ring-fill{0%{stroke-dashoffset:var(--ring-from,100)}}}@layer reset{*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--cream);color:var(--ink);font-family:var(--font-body);font-size:1.0625rem;line-height:1.55;-webkit-font-smoothing:antialiased}.display,h1,h2,h3{font-family:var(--font-display);font-weight:800;line-height:1.08;letter-spacing:-.02em;margin:0}h1{font-size:clamp(1.9rem,5.5vw,2.6rem)}h2{font-size:1.35rem}h3{font-size:1.08rem}p{margin:0}a{color:var(--fox-text);text-underline-offset:3px}button{font:inherit;color:inherit}:focus-visible{outline:3px solid var(--fox-deep);outline-offset:2px}}@layer primitives{.score,.stat,.timer{font-family:var(--font-mono);font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.shell{max-width:var(--measure-read);margin:0 auto;padding:1.25rem 1rem 3rem}.shell-wide{max-width:960px}.stack{display:grid;grid-gap:1rem;gap:1rem}.stack-s{display:grid;grid-gap:.5rem;gap:.5rem}.stack-l{display:grid;grid-gap:1.75rem;gap:1.75rem}.row,.row-between{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}.row-between{justify-content:space-between}.app-shell{display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr);min-height:100vh;align-items:start}.app-main{min-width:0;width:100%;max-width:var(--measure-app);margin:0 auto;padding:1.6rem 1.8rem 3rem;display:flex;flex-direction:column;gap:1.1rem}.grid-2{grid-template-columns:1.55fr 1fr;grid-gap:var(--gap-col)}.grid-2,.grid-q{display:grid;gap:var(--gap-col);align-items:start}.grid-q{grid-template-columns:1.5fr 1fr;grid-gap:var(--gap-col)}.grid-split{grid-template-columns:1fr 1fr;grid-gap:var(--gap-col)}.grid-3,.grid-split{display:grid;gap:var(--gap-col);align-items:start}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-3,.rail{grid-gap:var(--gap-col)}.rail{display:grid;gap:var(--gap-col);align-content:start}}@layer components{.btn-destructive,.btn-ghost,.btn-learn,.btn-primary,.btn-secondary,.btn-success{display:inline-flex;align-items:center;justify-content:center;gap:.55ch;font:800 1.0625rem/1.1 var(--font-display);letter-spacing:.01em;border-radius:var(--radius-btn);padding:.85em 1.5em;min-height:48px;cursor:pointer;text-decoration:none;transition:transform var(--speed-tap) var(--ease-spring),box-shadow var(--speed-tap) ease,background var(--speed-tap) ease,color var(--speed-tap) ease;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;-moz-user-select:none;user-select:none}.btn-primary{color:var(--ink);background:var(--fox);border:var(--border);box-shadow:var(--depth-ink)}.btn-primary:hover{background:#ff7a3f}.btn-primary:active{transform:translateY(4px);box-shadow:0 0 0 var(--ink);background:var(--fox-deep);color:#fff}.btn-secondary{color:var(--ink);background:var(--surface);border:2px solid var(--line-strong);box-shadow:0 4px 0 var(--line-strong)}.btn-secondary:hover{background:var(--receipt)}.btn-secondary:active{transform:translateY(4px);box-shadow:0 0 0 var(--line-strong)}.btn-ghost{color:var(--stone);background:transparent;border:2px solid transparent;min-height:44px;padding:.7em 1.1em}.btn-ghost:hover{color:var(--ink);background:var(--receipt)}.btn-destructive{color:#fff;background:var(--clay);border:2px solid var(--clay-deep);box-shadow:0 4px 0 var(--clay-deep)}.btn-destructive:hover{background:var(--clay-deep)}.btn-destructive:active{transform:translateY(4px);box-shadow:0 0 0 var(--clay-deep)}.btn-success{color:#fff;background:var(--moss-deep);border:2px solid #0f5a37;box-shadow:0 4px 0 #0f5a37}.btn-success:active{transform:translateY(4px);box-shadow:0 0 0 #0f5a37}.btn-learn{color:#fff;background:var(--sky);border:2px solid var(--sky-deep);box-shadow:0 4px 0 #134896}.btn-learn:active{transform:translateY(4px);box-shadow:0 0 0 #134896}.btn-block{width:100%}.btn-sm{min-height:38px;padding:.55em 1em;font-size:.92rem}a.btn-destructive,a.btn-ghost,a.btn-learn,a.btn-primary,a.btn-secondary,a.btn-success{text-decoration:none}.btn-destructive[disabled],.btn-ghost[disabled],.btn-learn[disabled],.btn-primary[disabled],.btn-secondary[disabled],.btn-success[disabled]{cursor:not-allowed;box-shadow:none;transform:none;background:var(--receipt);color:#9a948b;border-color:var(--line-soft)}button[aria-busy=true]{cursor:progress;opacity:1}.spin-arc{width:.9em;height:.9em;flex:0 0 auto;border:2.5px solid;border-top:2.5px solid transparent;border-radius:50%;animation:foxspin .8s linear infinite}.card{background:var(--surface);border:var(--border-soft);border-radius:var(--radius-card);box-shadow:var(--depth-soft);padding:1.25rem}.card-hero,.card-pop{border:var(--border);box-shadow:var(--shadow-card)}.card-hero{box-shadow:var(--shadow-hero)}.card-highlight{background:var(--fox-tint);border-color:#ffd2b3;box-shadow:0 3px 0 #ffd2b3}.card-stat{background:var(--ink);color:var(--cream);border-color:var(--ink);box-shadow:none}.card-stat .kicker{color:var(--gold)}.card-receipt{background:var(--receipt);border-color:var(--line-soft);box-shadow:none}.card-receipt .quote{font-style:italic}.card-learn{background:var(--sky-tint);border-color:#c7dcfb;box-shadow:0 3px 0 #c7dcfb}.card-link{display:block;color:inherit;text-decoration:none;transition:transform var(--speed-tap) var(--ease-spring)}.card-link:hover{border-color:var(--line-strong)}.card-link:active{transform:translateY(2px);box-shadow:0 1px 0 var(--line-strong)}.kicker{font:800 .72rem var(--font-display);letter-spacing:.08em;text-transform:uppercase;color:var(--stone)}.chip{display:inline-flex;align-items:center;gap:.4ch;font:700 .84rem var(--font-display);padding:.28em .8em;border-radius:var(--radius-pill);white-space:nowrap}.chip-moss{background:var(--moss-tint);color:var(--moss-deep);border:2px solid #b5e3c8}.chip-focus{background:var(--fox-tint);color:var(--fox-text);border:2px solid #ffd2b3}.chip-clay{background:var(--clay-tint);color:var(--clay-deep);border:2px solid #ffc9cb}.chip-gold{background:var(--gold-tint);color:var(--gold-deep);border:2px solid #ffe29a}.chip-sky{background:var(--sky-tint);color:var(--sky-deep);border:2px solid #c7dcfb}.chip-neutral{background:var(--receipt);color:var(--ink);border:2px solid var(--line-soft)}.chip-wrap{white-space:normal;max-width:100%}.streak-week{gap:6px}.streak-day,.streak-week{display:inline-flex;align-items:center}.streak-day{width:22px;height:22px;border-radius:50%;border:2px solid var(--line-strong);background:var(--surface);justify-content:center;font:800 11px var(--font-display);color:var(--ink)}.streak-day.done{background:var(--gold);border-color:var(--gold-deep)}.streak-count{font-family:var(--font-display);font-weight:800;color:var(--fox-text)}.bar{height:12px;background:#efe9df;overflow:hidden}.bar,.bar>div{border-radius:var(--radius-pill)}.bar>div{height:100%;transition:width .42s var(--ease-out)}.bar-strong>div{background:var(--moss)}.bar-focus>div{background:var(--fox)}.bar-gold>div{background:var(--gold)}.bar-idle>div{background:var(--line-strong)}.foxspin{animation:foxspin 1.1s linear infinite;transform-origin:center}.foxdots span{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--fox);margin-right:4px;animation:foxpulse 1s ease-in-out infinite}.foxdots span:nth-child(2){animation-delay:.15s}.foxdots span:nth-child(3){animation-delay:.3s}.fox{display:block;overflow:visible;flex:0 0 auto}.fox .fox-eyes,.fox .fox-head,.fox .fox-tail{transform-box:fill-box}.fox .fox-tail{transform-origin:10% 90%}.fox .fox-eyes{transform-origin:center}.fox-idle .fox-head{animation:fox-bob 3.2s ease-in-out infinite;transform-origin:50% 100%}.fox-idle .fox-tail,.fox-wag .fox-tail{animation:fox-wag 1.6s ease-in-out infinite}.fox-wag .fox-tail{animation-duration:.5s}.fox .fox-blink{animation:fox-blink 4.5s ease-in-out infinite}.fox-pop{animation:fox-pop .42s var(--ease-spring) both}.fox-hop{animation:fox-hop .7s var(--ease-out) both;transform-origin:50% 100%}.fox-hop .fox-tail{animation:fox-wag .35s ease-in-out 3}.fox-shake{animation:fox-shake .52s ease-in-out both;transform-origin:50% 90%}.fox-zzz{animation:foxpulse 2.4s ease-in-out infinite}.fox-says{display:flex;align-items:center;gap:.75rem}.bubble{position:relative;background:var(--surface);border:var(--border-soft);border-radius:16px;padding:.6rem .9rem;font:700 1rem/1.35 var(--font-display);box-shadow:var(--depth-soft)}.bubble:before{content:"";position:absolute;left:-9px;top:50%;width:14px;height:14px;background:inherit;border-left:var(--border-soft);border-bottom:var(--border-soft);transform:translateY(-50%) rotate(45deg)}.nav{display:flex;justify-content:space-between;gap:1rem;padding:.25rem 0 1.25rem}.nav,.wordmark{align-items:center}.wordmark{display:inline-flex;gap:.45rem;text-decoration:none;color:var(--ink)}.wordmark span{font:800 1.45rem var(--font-display);letter-spacing:-.03em}.wordmark span b{color:var(--fox);font-weight:800}.nav-links{display:flex;gap:1.1rem;align-items:center;font:700 .95rem var(--font-display)}.nav-links a{color:var(--stone);text-decoration:none}.nav-links a:hover{color:var(--ink)}.sidebar{position:-webkit-sticky;position:sticky;top:0;align-self:start;height:100vh;display:flex;flex-direction:column;gap:1rem;padding:1.3rem 1rem 1rem;background:var(--surface);border-right:var(--border-soft)}.sidebar .wordmark{padding:0 .5rem}.sidebar .wordmark span{font-size:1.4rem}.course-switcher{border:var(--border-soft);border-radius:12px;background:var(--cream);font:700 .85rem var(--font-display);color:var(--ink);padding:.5rem .7rem;width:100%;-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer}.nav-list{display:flex;flex-direction:column;gap:4px}.nav-item{display:flex;align-items:center;gap:.8rem;padding:.62rem .8rem;border-radius:14px;font:800 .95rem var(--font-display);letter-spacing:.01em;color:var(--stone);text-decoration:none;border:2px solid transparent;transition:background var(--speed-tap) ease}.nav-item:hover{color:var(--ink);background:var(--receipt)}.nav-item .ic{width:26px;height:26px;flex:0 0 auto}.nav-item[aria-current=page]{background:var(--fox-tint);color:var(--fox-text);border-color:#ffc8a3}.sidebar-foot{margin-top:auto;border-top:2px solid var(--line-soft);padding-top:.85rem;display:grid;grid-gap:.35rem;gap:.35rem}.tabbar,.topbar{display:none}.kbd{display:inline-flex;align-items:center;justify-content:center;min-width:22px;height:22px;padding:0 6px;border:solid var(--line-strong);border-width:2px 2px 3px;border-radius:6px;font:700 11px var(--font-mono);background:var(--surface);color:var(--ink)}.kbd-on-fox{background:#fff;color:var(--ink);border-color:#fff}.kbd-correct{background:var(--moss-deep);color:#fff;border-color:var(--moss-deep)}.kbd-wrong{background:var(--clay);color:#fff;border-color:var(--clay)}.unit-row{display:grid;grid-template-columns:1fr 128px 42px;grid-gap:.6rem;gap:.6rem;align-items:center;font-size:.9rem;padding:.4rem 0}.unit-row+.unit-row{border-top:2px solid var(--line-soft)}.editor{width:100%;min-height:260px;resize:vertical;border:var(--border-soft);border-radius:var(--radius-inner);background:var(--surface);padding:.9rem;font:400 1rem var(--font-body);color:var(--ink);line-height:1.6}.editor:focus{border-color:var(--fox);outline:none}.choices{display:grid;grid-gap:.7rem;gap:.7rem}.choice{display:flex;gap:.85rem;align-items:center;width:100%;text-align:left;background:var(--surface);color:var(--ink);border:2px solid var(--line-soft);border-radius:var(--radius-inner);box-shadow:0 3px 0 var(--line-strong);padding:.85rem 1rem;font:500 1.02rem/1.45 var(--font-body);cursor:pointer;transition:transform var(--speed-tap) var(--ease-spring),background var(--speed-tap) ease,border-color var(--speed-tap) ease,box-shadow var(--speed-tap) ease;-webkit-tap-highlight-color:transparent}.choice:hover{border-color:var(--line-strong);background:#fffaf3}.choice:active{transform:translateY(3px);box-shadow:0 0 0 var(--line-strong)}.choice .key{flex:0 0 auto;display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;border:2px solid var(--line-strong);background:var(--surface);font:800 .85rem var(--font-display);color:var(--stone)}.choice[disabled]{cursor:default}.choice[disabled]:active{transform:none;box-shadow:0 3px 0 var(--line-strong)}.choice.is-selected,.choice[aria-pressed=true]{border-color:var(--sky);background:var(--sky-tint);box-shadow:0 3px 0 var(--sky)}.choice.is-selected .key,.choice[aria-pressed=true] .key{border-color:var(--sky);color:var(--sky-deep)}.choice-correct,.choice-correct[disabled]:hover{background:var(--moss-tint);border-color:var(--moss);box-shadow:0 3px 0 var(--moss)}.choice-correct .key{background:var(--moss);border-color:var(--moss);color:#fff}.choice-wrong,.choice-wrong[disabled]:hover{background:var(--clay-tint);border-color:var(--clay);box-shadow:0 3px 0 var(--clay);animation:wiggle .32s ease-in-out 1}.choice-wrong .key{background:var(--clay);border-color:var(--clay);color:#fff}.choice-dimmed{opacity:.55}.choice .note{margin-left:auto;font:800 .8rem var(--font-display);white-space:nowrap}.choice-correct .note{color:var(--moss-deep)}.choice-wrong .note{color:var(--clay-deep)}.verdict{font:800 1.3rem var(--font-display)}.verdict-correct{color:var(--moss-deep)}.verdict-wrong{color:var(--clay-deep)}.rubric{border-top:2px solid var(--line-soft);padding:.6rem 0;display:flex;gap:.75rem;align-items:baseline;font-size:.95rem}.test-topic-name{flex:1 1;min-width:0;overflow-wrap:anywhere}.test-topic-bar{flex:0 0 90px;width:90px}@media (max-width:480px){.test-topic{gap:.6rem}.test-topic-bar{display:none}}.earn{color:var(--moss-deep)}.earn,.miss{font-weight:700}.miss{color:var(--clay-deep)}.rubric-row{display:grid;grid-template-columns:3.2rem minmax(0,1fr);grid-gap:.85rem;gap:.85rem;padding:.75rem 0;align-items:start}.rubric-row+.rubric-row{border-top:2px solid var(--line-soft)}.rubric-points{font:800 1rem var(--font-mono);text-align:right;padding-top:1px}.rubric-points.is-earned{color:var(--moss-deep)}.rubric-points.is-missed{color:var(--clay-deep)}.rubric-quote{margin:.4rem 0 0;padding:.5rem .7rem;background:var(--receipt);border-radius:var(--radius-inner);border-left:4px solid var(--moss);font-style:italic;font-size:.9rem;line-height:1.5}.rubric-nothing{margin:.35rem 0 0;font-size:.85rem;color:var(--stone)}.explainer{display:grid;grid-gap:.7rem;gap:.7rem}.ex-gist{font:600 1.08rem/1.5 var(--font-body)}.ex-gist strong,.ex-remember strong,.ex-steps strong,.ex-whynot strong{font-weight:800}.ex-whynot{padding:.7rem .85rem;border-radius:var(--radius-inner);background:var(--surface);border:2px solid #ffc9cb;font-size:.98rem;line-height:1.5}.ex-steps-label,.ex-whynot .ex-label{display:block;font:800 .72rem var(--font-display);letter-spacing:.08em;text-transform:uppercase;margin-bottom:.2rem}.ex-whynot .ex-label{color:var(--clay-deep)}.ex-steps{margin:0;padding:0;list-style:none;display:grid;grid-gap:.45rem;gap:.45rem;counter-reset:step}.ex-steps li{position:relative;padding-left:2.1rem;font-size:.98rem;line-height:1.5;counter-increment:step}.ex-steps li:before{content:counter(step);position:absolute;left:0;top:.05rem;width:1.5rem;height:1.5rem;border-radius:50%;display:grid;place-items:center;background:var(--ink);color:var(--cream);font:800 .75rem var(--font-display)}.ex-remember{display:flex;gap:.6rem;align-items:center;padding:.65rem .85rem;border-radius:var(--radius-inner);background:var(--gold-tint);border:2px solid #ffe29a;font:700 .98rem/1.4 var(--font-display)}.ex-remember .ex-label{color:var(--gold-deep);font:800 .72rem var(--font-display);letter-spacing:.08em;text-transform:uppercase;white-space:nowrap}.ex-more{font:700 .9rem var(--font-display);color:var(--stone);cursor:pointer;list-style:none}.ex-more::-webkit-details-marker{display:none}.ex-more::marker{content:""}.ex-legacy{font-size:.98rem;line-height:1.6}.contrast{width:100%;border-collapse:collapse;table-layout:fixed}.contrast th{font:800 .9rem var(--font-display);text-align:left;vertical-align:bottom;padding:0 .75rem .45rem 0;border-bottom:2px solid var(--ink)}.contrast td{padding:.55rem .75rem .55rem 0;font-size:.95rem;line-height:1.5;vertical-align:top}.contrast tbody tr+tr td{border-top:2px solid var(--line-soft)}.contrast td:last-child,.contrast th:last-child{padding-right:0}.brief-tell{margin:0;padding:.75rem .95rem;background:var(--gold-tint);border-radius:var(--radius-inner);border:2px solid #ffe29a;font:700 1rem/1.45 var(--font-display)}.brief-body{display:grid;grid-gap:.9rem;gap:.9rem}.brief-h{font:800 1.05rem var(--font-display);margin:.4rem 0 -.3rem}.brief-hook strong,.brief-list strong,.brief-para strong,.contrast strong{font-weight:800}.brief-body>*{max-width:var(--measure-brief)}.brief-para{margin:0;font-size:1.04rem;line-height:1.7}.brief-hook{margin:0;font-size:1.12rem;line-height:1.5;font-weight:600}.brief-list{font-size:1.02rem;line-height:1.65;margin:0;padding-left:1.2rem}.brief-list li+li{margin-top:.45rem}.brief-worked{background:var(--receipt);border-radius:var(--radius-inner);padding:.9rem 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