@font-face{font-family:Inter Variable;src:url(/fonts/InterVariable.woff2) format("woff2-variations");font-weight:100 900;font-style:normal;font-display:swap}@font-face{font-family:Inter Display;src:url(/fonts/InterDisplay-Bold.woff2) format("woff2");font-weight:700;font-style:normal;font-display:swap}@font-face{font-family:JetBrains Mono;src:url(/fonts/JetBrainsMono-Regular.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap}:root{color-scheme:light dark;--ink-900:#0b1420;--ink-800:#101d2e;--ink-700:#17293f;--ink-600:#22394f;--accent:#d97706;--accent-strong:#b45309;--accent-soft:rgba(217,119,6,0.12);--accent-line:rgba(217,119,6,0.34);--bg:#f6f7f9;--bg-raised:#ffffff;--bg-sunken:#eef1f5;--grid-line:rgba(16,29,46,0.055);--grid-line-strong:rgba(16,29,46,0.1);--text:#101d2e;--text-muted:#4a5b6f;--text-faint:#6b7a8d;--border:rgba(16,29,46,0.14);--border-strong:rgba(16,29,46,0.26);--ok:#0f766e;--ok-soft:rgba(15,118,110,0.12);--warn:#b45309;--bad:#b91c1c;--bad-soft:rgba(185,28,28,0.1);--font-sans:"Inter Variable",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;--font-display:"Inter Display","Inter Variable",ui-sans-serif,system-ui,sans-serif;--font-mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;--radius-sm:6px;--radius:10px;--radius-lg:16px;--shadow-sm:0 1px 2px rgba(11,20,32,0.06);--shadow:0 2px 10px rgba(11,20,32,0.08);--shadow-lg:0 18px 48px rgba(11,20,32,0.16);--measure:68ch;--page-max:1180px;--gutter:clamp(1rem,4vw,2.5rem);--safe-bottom:env(safe-area-inset-bottom,0px);--safe-top:env(safe-area-inset-top,0px);--safe-left:env(safe-area-inset-left,0px);--safe-right:env(safe-area-inset-right,0px)}@media (prefers-color-scheme:dark){:root{--bg:#0b1420;--bg-raised:#101d2e;--bg-sunken:#08101a;--grid-line:rgba(148,176,205,0.06);--grid-line-strong:rgba(148,176,205,0.11);--accent:#f0a13a;--accent-strong:#ffb45c;--accent-soft:rgba(240,161,58,0.14);--accent-line:rgba(240,161,58,0.38);--text:#e8eef5;--text-muted:#a8b8c9;--text-faint:#8394a7;--border:rgba(148,176,205,0.2);--border-strong:rgba(148,176,205,0.36);--ok:#4fd1c5;--ok-soft:rgba(79,209,197,0.14);--warn:#f0a13a;--bad:#f87171;--bad-soft:rgba(248,113,113,0.14);--shadow-sm:0 1px 2px rgba(0,0,0,0.4);--shadow:0 2px 12px rgba(0,0,0,0.45);--shadow-lg:0 20px 52px rgba(0,0,0,0.6)}}*,:after,:before{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:after,:before{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}}body{margin:0;min-height:100dvh;display:flex;flex-direction:column;background-color:var(--bg);background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px),linear-gradient(var(--grid-line-strong) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line-strong) 1px,transparent 1px);background-size:24px 24px,24px 24px,120px 120px,120px 120px;background-position:-1px -1px;color:var(--text);font-family:var(--font-sans);font-size:16px;line-height:1.65;font-feature-settings:"cv05" 1,"ss03" 1;padding-left:var(--safe-left);padding-right:var(--safe-right)}h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;letter-spacing:-.02em;line-height:1.2;margin:0 0 .5em;text-wrap:balance}h1{font-size:clamp(1.85rem,1.3rem + 2.2vw,2.85rem)}h2{font-size:clamp(1.35rem,1.1rem + 1.1vw,1.8rem);margin-top:2rem}h3{font-size:1.15rem;margin-top:1.5rem}p{margin:0 0 1rem}a{color:var(--accent-strong);text-underline-offset:.18em;text-decoration-thickness:1px}@media (prefers-color-scheme:dark){a{color:var(--accent-strong)}}a:hover{color:var(--accent)}.mono,.num,code,kbd,samp{font-family:var(--font-mono);font-feature-settings:"tnum";font-variant-numeric:tabular-nums}code{font-size:.9em;background:var(--bg-sunken);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.1em .35em}kbd{font-size:.82em;background:var(--bg-raised);border:solid var(--border-strong);border-width:1px 1px 2px;border-radius:var(--radius-sm);padding:.12em .4em;white-space:nowrap}hr{border:0;border-top:1px solid var(--border);margin:2rem 0}ol,ul{margin:0 0 1rem;padding-left:1.25rem}li{margin-bottom:.4rem}button{font:inherit;color:inherit}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:3px}.skip-link{position:absolute;left:-9999px;top:0;z-index:100;background:var(--accent);color:#0b1420;padding:.6rem 1rem;font-weight:600;border-radius:0 0 var(--radius) 0}.skip-link:focus{left:0}.wrap{max-width:var(--page-max)}.wrap,.wrap-narrow{width:100%;margin-inline:auto;padding-inline:var(--gutter)}.wrap-narrow{max-width:820px}main{flex:1 0 auto;padding-block:clamp(1.5rem,3vw,2.75rem) clamp(3rem,6vw,5rem)}.prose{max-width:var(--measure)}.prose h2{padding-top:.25rem}.stack>*+*{margin-top:1rem}.grid-cards{display:grid;grid-gap:1rem;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr));list-style:none;padding:0;margin:0}.card{background:var(--bg-raised);border:1px solid var(--border);border-radius:var(--radius);padding:1.15rem 1.25rem;box-shadow:var(--shadow-sm)}.card-link{display:block;color:inherit;text-decoration:none;transition:border-color .15s ease,transform .15s ease,box-shadow .15s ease}.card-link:hover{border-color:var(--accent-line);box-shadow:var(--shadow);transform:translateY(-1px);color:inherit}.card-link h3{margin-top:0;margin-bottom:.3rem;font-size:1.05rem}.card-link p{margin:0;color:var(--text-muted);font-size:.92rem}.panel{background:var(--bg-raised);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--radius);padding:1rem 1.15rem}.callout{background:var(--accent-soft);border:1px solid var(--accent-line);border-radius:var(--radius);padding:.9rem 1.1rem;font-size:.95rem}.callout>:last-child{margin-bottom:0}.note{font-size:.9rem}.chip,.note{color:var(--text-muted)}.chip{display:inline-flex;align-items:center;gap:.35rem;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;padding:.2rem .5rem;border:1px solid var(--border);border-radius:999px;background:var(--bg-sunken);white-space:nowrap}.chip-accent{background:var(--accent-soft);border-color:var(--accent-line);color:var(--accent-strong)}.chip-ok{background:var(--ok-soft);border-color:transparent;color:var(--ok)}.chip-row{display:flex;flex-wrap:wrap;gap:.4rem;list-style:none;padding:0;margin:0 0 .75rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.6rem 1.1rem;min-height:44px;border-radius:var(--radius);border:1px solid var(--border-strong);background:var(--bg-raised);color:var(--text);font-weight:600;font-size:.95rem;cursor:pointer;text-decoration:none;transition:background .15s ease,border-color .15s ease}.btn:hover:not(:disabled){border-color:var(--accent-line);color:var(--text)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#0b1420}.btn-primary:hover:not(:disabled){background:var(--accent-strong);border-color:var(--accent-strong);color:#0b1420}.btn-quiet{background:transparent;border-color:transparent;color:var(--text-muted);padding-inline:.5rem}.btn-quiet:hover:not(:disabled){color:var(--text)}.btn-row{display:flex;flex-wrap:wrap;gap:.6rem}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);padding-top:var(--safe-top)}.site-header-inner{display:flex;align-items:center;gap:1rem;min-height:58px;flex-wrap:wrap}.brand{display:inline-flex;align-items:center;gap:.55rem;font-family:var(--font-display);font-size:1.08rem;font-weight:700;letter-spacing:-.02em;text-decoration:none;white-space:nowrap}.brand,.brand:hover{color:var(--text)}.brand-mark{display:block;width:26px;height:26px;flex:none}.site-nav{display:flex;align-items:center;gap:.15rem;flex-wrap:wrap;margin-left:auto;overflow-x:auto;scrollbar-width:none}.site-nav::-webkit-scrollbar{display:none}.site-nav a{display:inline-block;padding:.35rem .6rem;border-radius:var(--radius-sm);color:var(--text-muted);font-size:.92rem;font-weight:500;text-decoration:none;white-space:nowrap}.site-nav a:hover{color:var(--text);background:var(--bg-sunken)}.site-nav a.nav-cta{color:var(--accent-strong);font-weight:600}.site-footer{flex:none;border-top:1px solid var(--border);background:var(--bg-sunken);padding-block:2rem;padding-bottom:calc(2rem + var(--safe-bottom));font-size:.88rem;color:var(--text-muted)}.site-footer h2{font-size:.72rem;font-family:var(--font-mono);font-weight:400;letter-spacing:.1em;text-transform:uppercase;color:var(--text-faint);margin:0 0 .6rem}.footer-cols{display:grid;grid-gap:1.5rem;gap:1.5rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,190px),1fr))}.footer-cols ul{list-style:none;margin:0;padding:0}.footer-cols li{margin-bottom:.3rem}.footer-cols a{color:var(--text-muted);text-decoration:none}.footer-cols a:hover{color:var(--accent-strong);text-decoration:underline}.footer-legal{margin-top:1.75rem;padding-top:1.25rem;border-top:1px solid var(--border);display:grid;grid-gap:.5rem;gap:.5rem}.footer-legal p{margin:0;font-size:.82rem;color:var(--text-faint)}.footer-sisters a{color:var(--text-muted);text-decoration:none}.footer-sisters a:hover{color:var(--accent-strong);text-decoration:underline}.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--border);background:radial-gradient(120% 90% at 88% -10%,var(--accent-soft),transparent 62%),linear-gradient(180deg,var(--bg-raised),transparent 78%)}.hero-inner{padding-block:clamp(2.5rem,6vw,4.5rem);position:relative;z-index:1;max-width:46rem}.hero .eyebrow{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-strong);margin-bottom:.75rem}.hero p.lede{font-size:clamp(1rem,.95rem + .35vw,1.15rem);color:var(--text-muted);max-width:40rem}.stat-row{display:flex;flex-wrap:wrap;gap:1.75rem;margin-top:1.75rem;list-style:none;padding:0}.stat-row li{margin:0}.stat-row .num{display:block;font-family:var(--font-display);font-size:1.7rem;line-height:1.1;color:var(--text)}.stat-row .lbl{font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--text-faint);font-family:var(--font-mono)}.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-raised)}table.data{width:100%;border-collapse:collapse;font-size:.92rem}table.data td,table.data th{text-align:left;padding:.55rem .8rem;border-bottom:1px solid var(--border);vertical-align:top}table.data th{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.07em;text-transform:uppercase;color:var(--text-faint);font-weight:500;white-space:nowrap}table.data tbody tr:last-child td{border-bottom:0}table.data td.num,table.data th.num{text-align:right;font-family:var(--font-mono);font-feature-settings:"tnum";font-variant-numeric:tabular-nums;white-space:nowrap}.spec-list{display:grid;grid-template-columns:minmax(7rem,max-content) 1fr;grid-gap:.45rem 1rem;gap:.45rem 1rem;margin:0 0 1rem;align-items:baseline}.spec-list dt{font-family:var(--font-mono);font-size:.78rem;letter-spacing:.04em;color:var(--text-faint);padding-top:.2rem}.spec-list dd{margin:0;min-width:0}@media (max-width:30rem){.spec-list{grid-template-columns:1fr;gap:.15rem 0}.spec-list dd{margin-bottom:.65rem}}.math-block{overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;max-width:100%;padding-block:.15rem;margin:.9rem 0}.math-block .katex-display{margin:0;padding-block:.25rem}.math-inline{display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:bottom}.katex{font-size:1.05em}.katex-display>.katex{white-space:normal}.math-error{font-family:var(--font-mono);font-size:.85em;color:var(--bad)}.question{background:var(--bg-raised);border:1px solid var(--border);border-radius:var(--radius);padding:1.15rem 1.25rem}.question-head{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin-bottom:.75rem}.question-stem{margin-bottom:1rem}.question-stem>:last-child{margin-bottom:0}.options{list-style:none;margin:0;padding:0;display:grid;grid-gap:.5rem;gap:.5rem}.option{display:flex;gap:.7rem;align-items:flex-start;width:100%;text-align:left;padding:.65rem .85rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);cursor:pointer;min-height:44px;transition:border-color .12s ease,background .12s ease}.option:hover:not(:disabled){border-color:var(--accent-line)}.option:disabled{cursor:default}.option-key{font-family:var(--font-mono);font-weight:600;color:var(--text-faint);flex:none;width:1.2em}.option-body{min-width:0;flex:1 1}.option.is-correct{border-color:var(--ok);background:var(--ok-soft)}.option.is-correct .option-key{color:var(--ok)}.option.is-wrong{border-color:var(--bad);background:var(--bad-soft)}.option.is-wrong .option-key{color:var(--bad)}.solution{margin-top:1rem;padding-top:1rem;border-top:1px dashed var(--border-strong)}.solution h4{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-faint);margin:0 0 .5rem}.solution-steps{list-style:none;margin:0 0 .75rem;padding:0;counter-reset:step}.solution-steps li{position:relative;padding-left:1.9rem;margin-bottom:.6rem;counter-increment:step}.solution-steps li:before{content:counter(step);position:absolute;left:0;top:.15rem;font-family:var(--font-mono);font-size:.7rem;width:1.35rem;height:1.35rem;display:grid;place-items:center;border-radius:999px;background:var(--accent-soft);color:var(--accent-strong);border:1px solid var(--accent-line)}.progress-bar{height:4px;border-radius:999px;background:var(--bg-sunken);overflow:hidden;border:1px solid var(--border)}.progress-bar span{display:block;height:100%;background:var(--accent);transition:width .25s ease}.timer{font-family:var(--font-mono);font-feature-settings:"tnum";font-variant-numeric:tabular-nums;font-size:1.1rem;font-weight:600}.timer.is-low{color:var(--bad)}.drill-bar{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem;margin-bottom:1rem}.drill-bar .progress-bar{flex:1 1 8rem;min-width:6rem}.recall-card{background:var(--bg-raised);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem 1.25rem;text-align:center;min-height:12rem;display:flex;flex-direction:column;justify-content:center;gap:.75rem}.recall-prompt{font-size:1.15rem;font-weight:600}.recall-answer{border-top:1px dashed var(--border-strong);padding-top:1rem}.locked{position:relative;border:1px dashed var(--border-strong);border-radius:var(--radius);background:var(--bg-sunken);padding:1.5rem 1.25rem;text-align:center;display:grid;grid-gap:.6rem;gap:.6rem;justify-items:center}.locked h3{margin:0;font-size:1.05rem}.locked p{margin:0;color:var(--text-muted);max-width:34rem;font-size:.93rem}.plan-grid{display:grid;grid-gap:.9rem;gap:.9rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,210px),1fr));margin:1.25rem 0;list-style:none;padding:0}.plan{display:flex;flex-direction:column;gap:.35rem;padding:1.1rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-raised)}.plan.is-featured{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent-line)}.plan-name{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-faint)}.plan-price{font-family:var(--font-display);font-size:1.5rem}.plan-sub{font-size:.82rem;color:var(--text-faint);min-height:1.2em}.plan .btn{margin-top:auto}.upsell-banner{position:fixed;left:0;right:0;bottom:0;z-index:40;display:flex;align-items:center;gap:.75rem;padding:.7rem var(--gutter);padding-bottom:calc(.7rem + var(--safe-bottom));padding-left:calc(var(--gutter) + var(--safe-left));padding-right:calc(var(--gutter) + var(--safe-right));background:var(--ink-800);color:#e8eef5;border-top:1px solid var(--accent-line);box-shadow:0 -6px 24px rgba(0,0,0,.25);font-size:.9rem}.upsell-banner p{margin:0;flex:1 1;min-width:0}.upsell-banner a{color:var(--accent);font-weight:600;white-space:nowrap;text-decoration:none}.upsell-banner a:hover{text-decoration:underline}.upsell-dismiss{flex:none;background:transparent;border:0;color:#a8b8c9;cursor:pointer;font-size:1.1rem;line-height:1;padding:.35rem .4rem;min-height:32px}.upsell-dismiss:hover{color:#fff}.code-block{font-family:var(--font-mono);font-size:.85rem;word-break:break-all;background:var(--bg-sunken);border:1px solid var(--border);border-radius:var(--radius);padding:.7rem .85rem;margin:.6rem 0}.interstitial{border:2px solid var(--accent);border-radius:var(--radius-lg);background:var(--bg-raised);padding:1.5rem;box-shadow:var(--shadow-lg)}.interstitial h2{margin-top:0;color:var(--accent-strong)}.field{display:grid;grid-gap:.35rem;gap:.35rem;margin-bottom:1rem}.field label{font-size:.85rem;font-weight:600}.field input{font:inherit;font-family:var(--font-mono);font-size:.9rem;padding:.6rem .75rem;min-height:44px;border:1px solid var(--border-strong);background:var(--bg-raised);color:var(--text);width:100%}.field input,.status{border-radius:var(--radius)}.status{padding:.8rem 1rem;font-size:.92rem;border:1px solid var(--border)}.status-ok{background:var(--ok-soft);color:var(--ok)}.status-bad,.status-ok{border-color:transparent}.status-bad{background:var(--bad-soft);color:var(--bad)}.status-info{background:var(--accent-soft);border-color:var(--accent-line)}.breadcrumbs{font-size:.82rem;color:var(--text-faint);margin-bottom:.75rem;font-family:var(--font-mono)}.breadcrumbs a{color:var(--text-muted);text-decoration:none}.breadcrumbs a:hover{color:var(--accent-strong)}.breadcrumbs span{margin-inline:.4rem;opacity:.5}.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;flex-wrap:wrap}.section-head h2{margin-bottom:.5rem}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}body.has-upsell main{padding-bottom:clamp(5rem,8vw,7rem)}