:root{--bg:#f5f7fa;--surface:#fff;--surface-2:#edf1f6;--surface-3:#e2e8f0;--text:#17202e;--muted:#556072;--border:#dde3ec;--border-strong:#c3ccd9;--field-border:#7f8a9c;--primary:#1b6f80;--primary-hover:#155b69;--primary-ink:#fff;--primary-soft:#dcf0f4;--accent:#f59e0b;--accent-soft:#fff3d6;--accent-ink:#7a4300;--accent-line:#b77400;--good:#23845a;--good-soft:#dcf4e7;--good-ink:#17603f;--on-good:#fff;--warn:#b45309;--bad:#c2410c;--bad-soft:#fde7dc;--bad-ink:#9a3412;--focus:#7c3aed;--scrim:#0f142073;--font:"Atkinson Hyperlegible", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;--fs-xs:.78rem;--fs-sm:.9rem;--fs-md:1rem;--fs-lg:1.15rem;--fs-xl:1.4rem;--fs-2xl:1.75rem;--fs-3xl:2.1rem;--s1:4px;--s2:8px;--s3:12px;--s4:16px;--s5:24px;--s6:32px;--s7:48px;--radius-xs:6px;--radius-sm:10px;--radius:16px;--radius-lg:22px;--radius-pill:999px;--shadow-sm:0 1px 2px #141e3c0f;--shadow:0 1px 2px #141e3c0d, 0 6px 20px #141e3c12;--shadow-lg:0 12px 40px #141e3c2e;--tap:48px;--ease:cubic-bezier(.2, .7, .3, 1);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0e131d;--surface:#161c29;--surface-2:#1e2636;--surface-3:#283144;--text:#e8ecf5;--muted:#a0abc0;--border:#2a3345;--border-strong:#3b465c;--field-border:#66738c;--primary:#4cc3d9;--primary-hover:#6fd0e2;--primary-ink:#0a1620;--primary-soft:#133038;--accent:#fbbf24;--accent-soft:#3a2f10;--accent-ink:#fcd34d;--accent-line:#fbbf24;--good:#4ade80;--good-soft:#13301e;--good-ink:#6ee7a0;--on-good:#06220f;--warn:#fbbf24;--bad:#fb923c;--bad-soft:#3b1f12;--bad-ink:#fdba74;--focus:#b794f6;--scrim:#0009;--shadow-sm:0 1px 2px #0000004d;--shadow:0 1px 2px #0000004d, 0 6px 20px #0000004d;--shadow-lg:0 12px 40px #0000008c;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}:root[data-theme=dark]{--bg:#0e131d;--surface:#161c29;--surface-2:#1e2636;--surface-3:#283144;--text:#e8ecf5;--muted:#a0abc0;--border:#2a3345;--border-strong:#3b465c;--field-border:#66738c;--primary:#4cc3d9;--primary-hover:#6fd0e2;--primary-ink:#0a1620;--primary-soft:#133038;--accent:#fbbf24;--accent-soft:#3a2f10;--accent-ink:#fcd34d;--accent-line:#fbbf24;--good:#4ade80;--good-soft:#13301e;--good-ink:#6ee7a0;--on-good:#06220f;--warn:#fbbf24;--bad:#fb923c;--bad-soft:#3b1f12;--bad-ink:#fdba74;--focus:#b794f6;--scrim:#0009;--shadow-sm:0 1px 2px #0000004d;--shadow:0 1px 2px #0000004d, 0 6px 20px #0000004d;--shadow-lg:0 12px 40px #0000008c;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html,body,#root{height:100%}body{background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;margin:0;font-size:17px;line-height:1.5}.reduced-motion *,.reduced-motion :before,.reduced-motion :after{scroll-behavior:auto!important;transition:none!important;animation:none!important}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}a{color:var(--primary);text-underline-offset:2px}h1,h2,h3{margin:0 0 var(--s2);letter-spacing:-.01em;line-height:1.2}h1{font-size:var(--fs-2xl)}h2{font-size:var(--fs-xl)}h3,h2.h3{font-size:var(--fs-lg)}p{margin:0 0 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span:first-child{color:var(--primary)}.textlink{align-items:center;gap:4px;min-height:44px;font-weight:700;text-decoration:none;display:inline-flex}.textlink:hover{text-decoration:underline}input,select,textarea{font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--field-border);border-radius:12px;width:100%;max-width:100%;min-height:48px;padding:12px 14px}label{margin:10px 0 6px;font-weight:700;display:block}.field{margin-bottom:12px}.choices{gap:10px;display:grid}.choice{text-align:left;border-width:2px;justify-content:flex-start;min-height:56px}.choice.selected{border-color:var(--primary);background:var(--primary-soft)}.choice.correct{border-color:var(--good);background:var(--good-soft)}.choice.wrong{border-color:var(--bad);background:var(--bad-soft)}.choice.correct:after{content:"✓";color:var(--good-ink);margin-left:auto;padding-left:8px;font-weight:800}.bar{background:var(--surface-2);border-radius:999px;height:12px;overflow:hidden}.bar>span{background:var(--primary);height:100%;transition:width .5s var(--ease);border-radius:999px;display:block}.bar.good>span{background:var(--good)}.bar.accent>span{background:var(--accent-line)}.bar.thin{height:6px}.stat{flex-direction:column;gap:2px;display:flex}.stat b{font-size:1.5rem;line-height:1.1}.stats{grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px;display:grid}.pring{flex-shrink:0;display:inline-flex;position:relative}.pring svg{display:block}.pring-arc{transition:stroke-dashoffset .6s var(--ease)}.pring-c{text-align:center;flex-direction:column;justify-content:center;align-items:center;line-height:1.1;display:flex;position:absolute;inset:0}.question{margin:10px 0 18px;font-size:1.25rem}.question .katex{font-size:1.15em}.katex-display{padding:4px 0;overflow:auto hidden}.feedback{border-radius:var(--radius-sm);margin-top:12px;padding:12px 14px}.feedback.good{background:var(--good-soft);border:1px solid var(--good)}.feedback.bad{background:var(--bad-soft);border:1px solid var(--bad)}.feedback.hint{background:var(--accent-soft);border:1px solid var(--accent)}.feedback.form{background:var(--accent-soft);border:1px dashed var(--accent)}.solution{background:var(--surface-2);border-radius:var(--radius-sm);margin-top:12px;padding:12px 14px}.solution ol{padding-left:1.2rem}.md p{margin:0 0 6px}.md ul,.md ol{margin:4px 0 6px;padding-left:1.3rem}.note{border-radius:var(--radius-sm);background:var(--surface-2);align-items:flex-start;gap:10px;margin:10px 0;padding:10px 12px;display:flex}.note .icon{color:var(--primary);margin-top:2px}.timer{align-items:center;gap:14px;display:flex}.ring{width:64px;height:64px;position:relative}.ring svg{transform:rotate(-90deg)}.ring .t{justify-content:center;align-items:center;font-size:.95rem;font-weight:800;display:flex;position:absolute;inset:0}.timer.big .ring{width:140px;height:140px}.timer.big .ring .t{font-size:1.7rem}.list{margin:0;padding:0;list-style:none}.list li{border-top:1px solid var(--border);padding:10px 0}.list li:first-child{border-top:0}.tag{background:var(--surface-2);color:var(--muted);vertical-align:middle;border-radius:6px;margin-left:6px;padding:2px 8px;font-size:.75rem;display:inline-block}.tag.gate{background:var(--accent-soft);color:var(--accent-ink)}.tag.opt{background:var(--primary-soft);color:var(--primary)}details summary{cursor:pointer;min-height:44px;padding:8px 0;font-weight:700;display:list-item}.chat{flex-direction:column;gap:10px;display:flex}.msg{border-radius:14px;max-width:92%;padding:10px 14px}.msg.user{background:var(--primary);color:var(--primary-ink);border-bottom-right-radius:4px;align-self:flex-end}.msg.assistant{background:var(--surface-2);border-bottom-left-radius:4px;align-self:flex-start}.hero{border-radius:var(--radius-lg);background:linear-gradient(150deg, var(--primary-soft), var(--surface) 75%);border:1px solid var(--border);margin-bottom:14px;padding:24px 18px}.badge{text-align:center;border-radius:var(--radius-sm);flex-direction:column;align-items:center;gap:4px;width:96px;padding:10px 6px;font-size:.75rem;display:inline-flex}.badge .e{background:var(--accent-soft);border-radius:50%;justify-content:center;align-items:center;width:52px;height:52px;font-size:1.8rem;display:inline-flex}.badge.locked{color:var(--muted)}.badge.locked .e{background:var(--surface-2);filter:grayscale();opacity:.55}table{border-collapse:collapse;width:100%;font-size:.95rem}th,td{text-align:left;border-bottom:1px solid var(--border);vertical-align:top;padding:8px 6px}.toast{left:50%;bottom:calc(84px + env(safe-area-inset-bottom));background:var(--text);color:var(--bg);z-index:20;box-shadow:var(--shadow-lg);border-radius:999px;padding:10px 16px;animation:.25s pop;position:fixed;transform:translate(-50%)}.toast .btn.ghost{color:inherit;border-color:currentColor}@keyframes pop{0%{opacity:0;transform:translate(-50%)scale(.9)}to{opacity:1;transform:translate(-50%)scale(1)}}.confetti{font-size:2rem;animation:.6s bounce;display:inline-block}@keyframes bounce{0%{transform:scale(.6)}60%{transform:scale(1.2)}to{transform:scale(1)}}@keyframes rise{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.rise{animation:rise .35s var(--ease) both}.lesson-steps{margin:6px 0;padding-left:1.3rem}.lesson-steps li{margin:6px 0}.lesson-body{min-height:120px}.lvl-not-started{--lvl:var(--surface-3);--lvl-soft:var(--surface-2);--lvl-ink:var(--muted);--lvl-on:var(--muted)}.lvl-attempted{--lvl:var(--bad);--lvl-soft:var(--bad-soft);--lvl-ink:var(--bad-ink);--lvl-on:#fff}.lvl-familiar{--lvl:var(--accent);--lvl-soft:var(--accent-soft);--lvl-ink:var(--accent-ink);--lvl-on:#1c1200}.lvl-proficient{--lvl:var(--primary);--lvl-soft:var(--primary-soft);--lvl-ink:var(--primary);--lvl-on:var(--primary-ink)}.lvl-mastered{--lvl:var(--good);--lvl-soft:var(--good-soft);--lvl-ink:var(--good-ink);--lvl-on:var(--on-good)}.mchip{font-size:var(--fs-xs);background:var(--lvl-soft);color:var(--lvl-ink);white-space:nowrap;border-radius:999px;align-items:center;gap:6px;padding:3px 10px 3px 8px;font-weight:700;display:inline-flex}.mchip .mdot{background:var(--lvl);border-radius:50%;width:8px;height:8px}.lvl-not-started.mchip .mdot{border:2px solid var(--border-strong);background:0 0}.mchip.compact{padding:2px 8px 2px 6px}.legend{font-size:var(--fs-xs);color:var(--muted);flex-wrap:wrap;gap:6px 14px;margin:12px 0 0;padding:0;list-style:none;display:flex}.legend li{align-items:center;gap:6px;display:inline-flex}.legend-sw{background:var(--lvl);border-radius:4px;width:12px;height:12px}.lvl-not-started.legend-sw{background:var(--surface-2);border:1.5px solid var(--border-strong)}.level-counts{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;display:grid}.level-count{border-radius:var(--radius-sm);background:var(--lvl-soft);color:var(--lvl-ink);text-align:center;padding:10px 8px}.level-count b{color:var(--text);font-size:1.5rem;line-height:1.1;display:block}.level-count span{font-size:var(--fs-xs);font-weight:700}.path{margin:0 -4px;overflow-x:clip}.path-nodes,.path-row{max-width:100%}.path-group{border-top:1px solid var(--border)}.path-group:first-child{border-top:0}.pg-head{width:100%;min-height:56px;font:inherit;color:var(--text);text-align:left;cursor:pointer;background:0 0;border:0;justify-content:space-between;align-items:center;gap:12px;padding:12px 4px;display:flex}div.pg-head{cursor:default}.pg-titles{flex-direction:column;display:flex}.pg-sub{font-size:var(--fs-xs);color:var(--muted);text-transform:uppercase;letter-spacing:.05em;font-weight:700}.pg-title{font-weight:800;font-size:var(--fs-lg)}.pg-meta{color:var(--muted);font-size:var(--fs-sm);align-items:center;gap:10px;font-weight:700;display:inline-flex}.pg-chev{transition:transform .2s var(--ease)}.pg-head[aria-expanded=true] .pg-chev{transform:rotate(180deg)}.path-nodes{margin:8px 0 12px;padding:0;list-style:none;position:relative}.path-line{pointer-events:none;position:absolute;top:0;left:50%;overflow:visible;transform:translate(-50%)}.path-row{flex-direction:column;align-items:center;gap:4px;display:flex;position:absolute;left:0;right:0}.pnode{cursor:pointer;background:0 0;border:0;border-radius:50%;padding:0;transition:transform .12s;position:relative}.pnode:hover{transform:scale(1.05)}.pnode:active{transform:scale(.96)}.pnode .pring{background:var(--surface);border-radius:50%}.pnode-disc{background:var(--lvl-soft);width:50px;height:50px;color:var(--lvl-ink);border-radius:50%;justify-content:center;align-items:center;display:inline-flex;box-shadow:inset 0 -3px #00000014}.pnode.lvl-proficient .pnode-disc,.pnode.lvl-mastered .pnode-disc{background:var(--lvl);color:var(--lvl-on)}.pnode.lvl-not-started .pnode-disc{background:var(--surface-2);color:var(--muted)}.pnode-dot{background:var(--border-strong);border-radius:50%;width:12px;height:12px}.pnode.locked 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