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:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;--bg:#f5f7fc;--surface:#fff;--surface-2:#edf2fc;--ink:#162e59;--text:#202d44;--muted:#53617a;--line:#c8d2e3;--control-line:#7485a1;--moss:#2856a4;--lime:#85b4ff;--lime-soft:#e4edff;--good:#276b42;--good-soft:#e1f0e4;--bad:#9e3626;--bad-soft:#f7e2dc;--note-soft:#fdf0d2;--focus:#805300;--on-ink:#f5f7fc;--radius:14px;--shadow:0 1px 2px #16342b0f, 0 8px 24px #16342b0f}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--bg:#101827;--surface:#172237;--surface-2:#21314b;--ink:#e5edff;--text:#dce5f7;--muted:#a9b9d3;--line:#435575;--control-line:#8294b2;--moss:#9bbfff;--lime:#85b4ff;--lime-soft:#243d63;--good:#82d39d;--good-soft:#163423;--bad:#f2a090;--bad-soft:#3b1e18;--note-soft:#392d14;--focus:#f0b45a;--on-ink:#101827;--shadow:0 1px 2px #0000004d, 0 8px 24px 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0}.button.quiet{background:var(--surface-2);color:var(--ink);border-color:var(--line)}.button.danger{background:var(--bad);border-color:var(--bad);color:var(--on-ink)}.button.small{min-height:36px;padding:6px 14px;font-size:.92rem}.button-row{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.google-g{background:#fff;border-radius:50%;width:18px;height:18px;padding:2px}.site-header .brand{flex-shrink:0;font-size:2.25rem;line-height:1}.site-header .brand-mark{flex:none;width:44px;height:44px}.site-header{border-bottom:1px solid var(--line);background:color-mix(in srgb, var(--bg) 88%, transparent);z-index:10;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);position:sticky;top:0}.site-header .container{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;min-height:68px;padding-block:12px;display:flex}.site-nav{align-items:center;gap:22px;font-size:.95rem;display:flex}.site-nav a:not(.button){color:var(--muted);text-decoration:none}.site-nav a:not(.button):hover,.site-nav a[aria-current=page]{color:var(--ink)}.site-nav a[aria-current=page]{font-weight:600}@media (max-width:720px){.site-nav .hide-sm{display:none}.app-nav{gap:14px;font-size:.9rem}}.site-footer{border-top:1px solid var(--line);color:var(--muted);margin-top:72px;padding-block:32px 24px}.footer-grid{flex-wrap:wrap;justify-content:space-between;gap:24px;display:flex}.footer-links{flex-wrap:wrap;gap:20px;font-size:.92rem;display:flex}.fine-print{margin-top:20px;font-size:.8rem}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.card>:last-child{margin-bottom:0}.grid{gap:16px;display:grid}.grid.two{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}.grid.three{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}.grid.four{grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}.notice{background:var(--note-soft);border-left:4px solid var(--focus);border-radius:10px;padding:14px 16px}.pill{background:var(--surface-2);color:var(--muted);border:1px solid var(--line);white-space:nowrap;border-radius:999px;align-items:center;gap:6px;padding:2px 10px;font-size:.78rem;font-weight:600;display:inline-flex}.pill.good{background:var(--good-soft);color:var(--good);border-color:#0000}.pill.lime{background:var(--lime-soft);color:var(--ink);border-color:#0000}.stat{flex-direction:column;gap:2px;display:flex}.stat strong{font-family:var(--font-display), Georgia, serif;color:var(--ink);font-size:2rem;line-height:1.1}.stat span{color:var(--muted);font-size:.88rem}.meter{background:var(--surface-2);border-radius:999px;height:8px;overflow:hidden}.meter>span{background:var(--moss);border-radius:inherit;height:100%;display:block}.page-head{padding-block:40px 8px}.page-head h1{font-size:clamp(1.9rem,4vw,2.6rem)}.section-head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:12px;margin:40px 0 14px;display:flex}.section-head h2{margin:0}.stack{flex-direction:column;gap:12px;display:flex}.row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;display:flex}.list-plain{margin:0;padding:0;list-style:none}details summary{cursor:pointer;color:var(--ink);font-weight:600}details[open]>summary{margin-bottom:8px}.activity{flex-direction:column;gap:10px;display:flex}.activity h3{margin:0}.activity .row{margin-top:auto}.badge{align-items:center;gap:12px;display:flex}.badge-icon{background:var(--surface-2);width:40px;height:40px;color:var(--muted);border-radius:50%;flex:none;place-items:center;display:grid}.badge.earned .badge-icon{background:var(--lime);color:#162e59}.badge:not(.earned){opacity:.7}.runner{grid-template-columns:minmax(0,1fr) 240px;align-items:start;gap:28px;padding-block:28px;display:grid}@media (max-width:860px){.runner{grid-template-columns:1fr}}.stimulus{font-family:var(--font-display), Georgia, serif;color:var(--ink);margin:0 0 18px;font-size:1.22rem;line-height:1.65}.prompt{margin-bottom:14px;font-weight:600}.choices{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.choice{text-align:left;border:1.5px solid var(--control-line);background:var(--surface);width:100%;color:var(--text);font:inherit;cursor:pointer;border-radius:12px;align-items:flex-start;gap:14px;padding:14px 16px;display:flex}.choice:hover{border-color:var(--moss)}.choice[aria-checked=true]{border-color:var(--ink);background:var(--lime-soft)}.choice-letter{border:1.5px solid var(--control-line);width:28px;height:28px;color:var(--ink);border-radius:50%;flex:none;place-items:center;font-size:.85rem;font-weight:700;display:grid}.choice[aria-checked=true] .choice-letter{background:var(--ink);border-color:var(--ink);color:var(--on-ink)}.choice.correct{border-color:var(--good);background:var(--good-soft);cursor:default}.choice.incorrect{border-color:var(--bad);background:var(--bad-soft);cursor:default}.choice.static{cursor:default}.choice-note{white-space:nowrap;margin-left:auto;font-size:.82rem;font-weight:600}.choice.correct .choice-note{color:var(--good)}.choice.incorrect .choice-note{color:var(--bad)}.save-state{min-height:1.6em;color:var(--muted);font-size:.88rem}.save-state.error{color:var(--bad);font-weight:600}.navigator{grid-template-columns:repeat(5,1fr);gap:8px;margin:12px 0 18px;display:grid}.navigator a{border:1.5px solid var(--control-line);background:var(--surface);border-radius:10px;place-items:center;height:38px;font-size:.9rem;font-weight:600;text-decoration:none;display:grid}.navigator a.answered{background:var(--lime-soft);border-color:#0000}.navigator a[aria-current=step]{border-color:var(--ink)}.navigator a.correct{background:var(--good-soft);color:var(--good);border-color:#0000}.navigator a.incorrect{background:var(--bad-soft);color:var(--bad);border-color:#0000}.kbd{border:1px solid var(--line);background:var(--surface-2);border-radius:5px;padding:1px 6px;font-family:ui-monospace,monospace;font-size:.8rem}.score-ring{--p:0;background:conic-gradient(var(--moss) calc(var(--p) * 1%), var(--surface-2) 0);border-radius:50%;flex:none;place-items:center;width:132px;height:132px;display:grid}.score-ring>div{background:var(--surface);text-align:center;border-radius:50%;place-items:center;width:104px;height:104px;display:grid}.score-ring strong{font-family:var(--font-display), Georgia, serif;color:var(--ink);font-size:1.9rem;line-height:1}.review-item{scroll-margin-top:90px}.review-item .explanation{background:var(--surface-2);border-radius:10px;margin-top:14px;padding:12px 14px}.form{flex-direction:column;gap:18px;display:flex}.field{flex-direction:column;gap:6px;display:flex}.field label,.field .label{color:var(--ink);font-weight:600}.field input[type=text],.field input[type=date],.field input[type=search],.field select{font:inherit;color:var(--text);background:var(--surface);border:1.5px solid var(--control-line);border-radius:10px;min-height:44px;padding:10px 12px}.check{align-items:flex-start;gap:10px;display:flex}.check input{width:20px;height:20px;accent-color:var(--ink);flex:none;margin-top:3px}.form-error{color:var(--bad);margin:0;font-weight:600}.form-ok{color:var(--good);margin:0;font-weight:600}.auth-shell{grid-template-rows:auto 1fr auto;min-height:100vh;display:grid}.auth-card{width:min(520px,100% - 32px);margin:48px auto}.auth-card h1{font-size:clamp(1.8rem,4vw,2.4rem)}.glossary-list{columns:2 320px;column-gap:16px}.glossary-list .card{break-inside:avoid;margin-bottom:16px}.glossary-list ul{color:var(--muted);margin:8px 0 0;padding-left:18px;font-size:.94rem}.legal{width:min(760px,100% - 32px);margin:0 auto;padding-block:40px}.legal h2{margin-top:2em;font-size:1.35rem}.legal li{margin-bottom:.4em}.legal-meta{color:var(--muted)}.hero{padding-block:clamp(48px,9vw,104px) 40px}.hero-grid{grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);align-items:center;gap:clamp(28px,5vw,64px);display:grid}@media (max-width:900px){.hero-grid{grid-template-columns:1fr}}.hero .hero-brand{gap:clamp(10px,2vw,24px);margin-bottom:24px;font-size:clamp(4.5rem,10vw,8rem);line-height:1}.hero-brand .brand-mark{flex:none;width:1em;height:1em}.hero h1{font-size:clamp(1.5rem,3.4vw,2rem);line-height:1.2}.hero-free{color:var(--moss);max-width:36ch;margin-block:12px 18px;font-size:clamp(1.1rem,2.4vw,1.3rem);font-weight:600}.lede{color:var(--muted);max-width:40ch;font-size:clamp(1.08rem,2vw,1.28rem)}.hero-proof{color:var(--muted);flex-wrap:wrap;gap:18px;margin-top:26px;font-size:.9rem;display:flex}.hero-proof span{align-items:center;gap:8px;display:inline-flex}.dot{background:var(--lime);border-radius:50%;flex:none;width:8px;height:8px}.demo{position:relative}.demo:before{content:"";background:var(--lime-soft);z-index:-1;border-radius:22px;position:absolute;inset:24px -18px -18px 24px}.demo .card{padding:26px}.demo-result{margin-top:14px}.band{padding-block:64px}.band.alt{background:var(--surface-2);border-block:1px solid var(--line)}.band h2{margin-top:0}.step-num{background:var(--ink);width:40px;height:40px;color:var(--on-ink);font-family:var(--font-display), Georgia, serif;border-radius:12px;place-items:center;margin-bottom:14px;font-weight:600;display:grid}.figure{font-family:var(--font-display), Georgia, serif;color:var(--ink);margin-bottom:6px;font-size:2.6rem;line-height:1}.faq details{border-bottom:1px solid var(--line);padding-block:16px}.faq details p{color:var(--muted);margin:8px 0 0}.cta{text-align:center;padding-block:72px}.cta p{margin-inline:auto}.rich-text p{margin:0 0 12px}.rich-text ul{margin:0 0 12px;padding-left:22px}.rich-text>:last-child{margin-bottom:0}.blank{border-bottom:2px solid;min-width:3.2em;display:inline-block}.math-display{margin:10px 0;display:block;overflow-x:auto}.q-figure{margin:0 0 18px;overflow-x:auto}.q-figure table{border-collapse:collapse;min-width:60%;font-size:.95rem}.q-figure caption{text-align:left;margin-bottom:6px;font-weight:600}.q-figure th,.q-figure td{border:1px solid var(--line);text-align:left;padding:6px 10px}.q-figure th{background:var(--surface-2)}.q-figure img{background:#fff;border-radius:8px;max-width:100%;height:auto}.timer{font-variant-numeric:tabular-nums;color:var(--ink);font-size:1.15rem;font-weight:700}.timer.low{color:var(--bad)}.spr-input{font:inherit;border:1.5px solid var(--control-line);background:var(--surface);width:9ch;color:var(--text);border-radius:10px;padding:8px 10px;font-size:1.2rem}.navigator a.flagged{box-shadow:inset 0 -3px 0 var(--focus)}.paused-panel{text-align:center;padding:48px 22px}.score-big{font-family:var(--font-display), Georgia, serif;color:var(--ink);font-size:3rem;line-height:1}.chart{width:100%;height:auto}.chart text{fill:var(--muted);font-size:11px}.badge-card.locked{opacity:.55}.invite-link{background:var(--surface-2);word-break:break-all;border-radius:10px;padding:10px 12px;font-family:ui-monospace,monospace;font-size:.95rem}.guides-index{padding-block:3rem 5rem}.guides-index .page-head{max-width:780px}.guide-list{grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));gap:1.5rem;margin-top:2rem;display:grid}.guide-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.75rem}.guide-card h2{font-size:clamp(1.45rem,3vw,1.9rem);line-height:1.25}.guide-card h2 a{color:inherit;text-decoration:none}.guide-card h2 a:hover{text-underline-offset:.15em;text-decoration:underline}.guide-layout{max-width:820px;padding-block:2rem 4rem}.guide-back{margin-bottom:2rem}.guide-header{border-bottom:1px solid 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