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(prefers-reduced-transparency:reduce),(prefers-contrast:more){.mobile-page-picker{background:var(--surface-glass-solid);-webkit-backdrop-filter:none;backdrop-filter:none}.mobile-page-picker::backdrop{-webkit-backdrop-filter:none;backdrop-filter:none;background:#0a0e0db8}}.site-footer{padding-block:var(--space-8) var(--space-7);background:var(--bg);color:var(--text);position:relative}.site-footer__grid{gap:var(--space-7);display:grid}@media (min-width:48rem){.site-footer__grid{gap:var(--space-7);grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,1fr))}}@media (min-width:72rem){.site-footer__grid{gap:var(--space-9)}}.site-footer__mark{gap:var(--space-4);max-inline-size:24rem;display:grid}.site-footer__mark p{color:var(--muted);font-size:var(--step-small);line-height:1.8}.site-footer__note{max-inline-size:22rem;border-block-start:var(--hairline) solid 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var(--section-y);background:var(--bg);color:var(--text);position:relative}.page-hero__inner{gap:var(--space-5);max-inline-size:52rem;display:grid}.page-hero h1{font-size:var(--step-title);line-height:var(--leading-title)}.page-hero__lede{max-inline-size:38rem;color:var(--muted);font-size:var(--step-lede)}.hero{min-block-size:100svh;padding-block:calc(var(--section-y) + 3rem) var(--section-y);background:var(--bg);color:var(--text);align-content:center;display:grid;position:relative;overflow:clip}.ink-field{z-index:0;pointer-events:none;position:absolute;inset:-12% -8%}.ink-blot{opacity:var(--blot-opacity,.5);filter:blur(var(--blot-blur,5rem));will-change:transform;animation:blot-drift var(--blot-duration,64s) var(--ease-standard) infinite alternate;animation-delay:var(--blot-delay,0s);border-radius:50%;position:absolute}.ink-blot--ash{--blot-opacity:.55;--blot-blur:6rem;--blot-duration:74s;background:radial-gradient(circle at 42% 38%,#7ea59675 0%,#4f726633 42%,#0000 70%);block-size:46vw;inline-size:46vw;inset-block-start:-6%;inset-inline-start:42%}.ink-blot--cinnabar{--blot-opacity:.5;--blot-blur:4.5rem;--blot-duration:58s;--blot-delay:-12s;background:radial-gradient(circle,#c4614c85 0%,#9e443838 45%,#0000 72%);block-size:32vw;inline-size:32vw;inset-block-start:24%;inset-inline-start:58%}.ink-blot--deep{--blot-opacity:.62;--blot-blur:7rem;--blot-duration:88s;--blot-delay:-30s;background:radial-gradient(at 55% 45%,#0a0e0dd1 0%,#0a0e0d75 48%,#0000 76%);block-size:44vw;inline-size:56vw;inset-block-start:30%;inset-inline-start:-12%}.ink-blot--bronze{--blot-opacity:.34;--blot-blur:5.5rem;--blot-duration:96s;--blot-delay:-48s;background:radial-gradient(circle,#c3a06157 0%,#0000 68%);block-size:26vw;inline-size:30vw;inset-block-start:62%;inset-inline-start:22%}@keyframes blot-drift{0%{transform:translate(0,0)scale(1)}to{transform:translate(-4%,5%)scale(1.16)}}.ink-veil{mix-blend-mode:overlay;opacity:.22;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='f'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.62' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23f)'/%3E%3C/svg%3E");position:absolute;inset:0}.ink-stroke{opacity:.5;block-size:118%;inline-size:auto;position:absolute;inset-block-start:-4%;inset-inline-start:50%;overflow:visible}.ink-stroke path{fill:none;stroke:var(--accent);stroke-linecap:round;stroke-dasharray:var(--stroke-length,1600);stroke-dashoffset:var(--stroke-length,1600);animation:stroke-write 3.4s var(--ease-ink) .35s forwards}.ink-stroke path.ink-stroke__ghost{stroke:var(--on-ink);opacity:.14;animation-duration:4s;animation-delay:.6s}@keyframes stroke-write{to{stroke-dashoffset:0}}.soak{white-space:pre-wrap;display:inline-block}.soak__char{opacity:0;pointer-events:none;filter:blur(.32em);animation:char-soak 1.25s var(--ease-ink) forwards;animation-delay:calc(var(--char-index,0) * 62ms + var(--soak-delay,0s));display:inline-block;transform:translateY(.22em)scale(1.06)}@keyframes char-soak{60%{opacity:1}to{opacity:1;filter:blur();transform:none}}.ink-fade{background:var(--paper-base);place-items:start center;block-size:clamp(2.25rem,3.6vw,3.75rem);display:grid}.ink-fade__rule{background:linear-gradient(to right, transparent, color-mix(in srgb, var(--ink-deep) 44%, transparent) 22%, color-mix(in srgb, var(--cinnabar) 76%, transparent) 50%, color-mix(in srgb, var(--ink-deep) 44%, transparent) 78%, transparent);block-size:1px;inline-size:min(14rem,28vw);margin-block-start:0;display:block}.ink-rule{background:linear-gradient(to right, transparent 0%, var(--line-strong) 12%, var(--line) 50%, var(--line-strong) 78%, transparent 100%);border:0;block-size:1px}@media (prefers-reduced-motion:reduce){.ink-blot{animation:none;transform:translate(-2%,2%)scale(1.08)}.ink-stroke path{stroke-dashoffset:0;animation:none}.soak__char{opacity:1;filter:none;animation:none;transform:none}}@media (forced-colors:active){.ink-field,.ink-fade:after{display:none}}.button{min-block-size:var(--target-min);justify-content:center;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-6);border:var(--hairline) solid transparent;border-radius:var(--radius-pill);font-size:var(--step-small);text-align:center;transition:background-color var(--dur-fast) var(--ease-standard), border-color var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard), transform var(--dur-instant) var(--ease-standard);font-weight:500;line-height:1;display:inline-flex}.button:active:not(:disabled){transform:scale(.978)}.button:disabled{cursor:not-allowed;opacity:.5}.button--primary{background:var(--accent);color:var(--on-accent)}.button--primary:hover:not(:disabled){background:color-mix(in srgb, var(--accent) 84%, var(--text))}.button--ghost{border-color:var(--line-strong);color:var(--text)}.button--ghost:hover:not(:disabled){border-color:var(--accent);background:color-mix(in srgb, var(--accent) 8%, transparent);color:var(--accent)}.button--quiet{padding-inline:var(--space-4);color:var(--muted)}.button--quiet:hover:not(:disabled){color:var(--accent)}.button-row{gap:var(--space-3);flex-wrap:wrap;display:flex}.link{border-block-end:1px solid color-mix(in srgb, var(--accent) 40%, transparent);color:var(--accent);transition:border-color var(--dur-fast) var(--ease-standard);align-items:baseline;gap:.35em;padding-block-end:.1em;display:inline-flex}.link:hover{border-block-end-color:var(--accent)}.link__arrow{transition:transform var(--dur-base) var(--ease-ink);font-size:.85em}.link:hover .link__arrow{transform:translate(.15em,-.15em)}.card{align-content:start;gap:var(--space-4);padding:clamp(var(--space-5), 2.4vw, var(--space-7));border:var(--hairline) solid var(--line);border-radius:var(--radius-lg);background:var(--bg-raised);transition:border-color var(--dur-base) var(--ease-standard), box-shadow var(--dur-base) var(--ease-standard), transform var(--dur-base) var(--ease-ink);display:grid;position:relative}.card--interactive:hover{border-color:color-mix(in srgb, var(--accent) 34%, var(--line));box-shadow:var(--shadow-2);transform:translateY(-.15rem)}.card--quiet{background:0 0}.card__head{justify-content:space-between;align-items:center;gap:var(--space-4);display:flex}.card h3{font-size:var(--step-heading);line-height:var(--leading-tight)}.card p{color:var(--muted)}.card__note{color:var(--subtle);font-family:var(--font-sans);font-size:var(--step-caption);letter-spacing:.04em}.grid{gap:var(--space-5);display:grid}.grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,20rem),1fr))}.grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,17rem),1fr))}.grid--4{grid-template-columns:repeat(auto-fit,minmax(min(100%,14rem),1fr))}@media (min-width:62rem){.grid--split{gap:var(--space-8);grid-template-columns:minmax(0,1fr) minmax(0,1.25fr);align-items:start}.grid--aside{gap:var(--space-8);grid-template-columns:minmax(0,1fr) minmax(0,18rem);align-items:start}}.chip{align-items:center;gap:var(--space-2);padding:.28rem var(--space-3);border:var(--hairline) solid var(--line);border-radius:var(--radius-pill);color:var(--muted);font-family:var(--font-sans);font-size:var(--step-caption);letter-spacing:.04em;white-space:nowrap;display:inline-flex}.chip-row{gap:var(--space-2);flex-wrap:wrap;display:flex}.state{color:var(--muted);font-family:var(--font-sans);font-size:var(--step-caption);letter-spacing:.04em;white-space:nowrap;align-items:center;gap:.45em;display:inline-flex}.state:before{content:"";background:currentColor;border-radius:50%;flex:none;block-size:.42rem;inline-size:.42rem;display:block}.state--done{color:var(--accent-quiet)}.state--progress{color:var(--accent-warm)}.state--none{color:var(--subtle)}.state--none:before{background:0 0;box-shadow:inset 0 0 0 1px}.ledger{border-block-start:var(--hairline) solid var(--line);display:grid}.ledger__row{gap:var(--space-2) var(--space-5);padding-block:var(--space-4);border-block-end:var(--hairline) solid var(--divider);grid-template-columns:minmax(0,1fr) auto;align-items:baseline;display:grid}.ledger__row>div{gap:.2rem;display:grid}.ledger__row strong{font-weight:600}.ledger__row small{color:var(--muted);font-size:var(--step-caption);line-height:1.6}.figure-row{gap:var(--space-5);grid-template-columns:repeat(auto-fit,minmax(min(100%,9rem),1fr));display:grid}.figure{gap:var(--space-2);border-inline-start:2px solid color-mix(in srgb, var(--accent) 45%, transparent);padding-inline-start:var(--space-4);display:grid}.figure__value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.02em;font-size:clamp(1.7rem,1.35rem + 1.4vw,2.6rem);line-height:1}.figure__label{color:var(--muted);font-size:var(--step-caption);line-height:1.5}.formula{padding:var(--space-4) var(--space-5);border:var(--hairline) solid var(--line);border-radius:var(--radius-md);background:var(--bg-sunk);color:var(--text);font-family:var(--font-mono);font-size:var(--step-small);white-space:pre;line-height:2;overflow-x:auto}.formula b{color:var(--accent);font-weight:600}.prose{gap:var(--space-5);max-inline-size:var(--reading-max);display:grid}.prose h2{font-size:var(--step-heading);line-height:var(--leading-tight)}.prose h3{font-size:var(--step-sub)}.prose p{color:var(--muted)}.prose strong{color:var(--text);font-weight:600}.article{gap:var(--space-9);display:grid}.article__block{gap:var(--space-4);max-inline-size:var(--reading-max);scroll-margin-block-start:6rem;display:grid}.aside-stack{gap:var(--space-4);display:grid;position:sticky;inset-block-start:6rem}@media (max-width:61.99rem){.aside-stack{position:static}}.cite{color:var(--subtle);font-family:var(--font-sans);font-size:var(--step-caption);letter-spacing:.03em;transition:color var(--dur-fast) var(--ease-standard);align-items:baseline;gap:.4em;display:inline-flex}.cite:hover{color:var(--accent)}.form{gap:var(--space-4);display:grid}.field{gap:var(--space-2);display:grid}.field label{color:var(--muted);font-family:var(--font-sans);font-size:var(--step-caption);letter-spacing:.05em}.field input,.field select,.field textarea{min-block-size:var(--target-min);padding:var(--space-3) var(--space-4);border:var(--hairline) solid var(--line-strong);border-radius:var(--radius-md);background:var(--bg);color:var(--text);font-family:var(--font-serif);font-size:var(--step-body);transition:border-color var(--dur-fast) var(--ease-standard), background-color var(--dur-fast) var(--ease-standard)}.field textarea{resize:vertical;min-block-size:7.5rem;line-height:1.7}.field input:hover,.field select:hover,.field textarea:hover{border-color:color-mix(in srgb, var(--accent) 40%, var(--line-strong))}:is(.field input:focus-visible,.field select:focus-visible,.field textarea:focus-visible){border-color:var(--accent);outline-offset:1px}.field ::placeholder{color:var(--subtle)}.field[data-invalid=true] input,.field[data-invalid=true] textarea,.field[data-invalid=true] select{border-color:var(--danger)}.field__error{color:var(--danger);font-family:var(--font-sans);font-size:var(--step-caption)}.form__status{gap:var(--space-2);min-block-size:1.5rem;font-size:var(--step-small);display:grid}.form__status[data-tone=success]{color:var(--accent-quiet)}.form__status[data-tone=error]{color:var(--danger)}.form__status[data-tone=pending]{color:var(--muted)}.form__fallback{padding:var(--space-4);border:var(--hairline) dashed var(--line-strong);border-radius:var(--radius-md);color:var(--muted);font-size:var(--step-small);line-height:1.75}.stage{border:var(--hairline) solid var(--line);border-radius:var(--radius-xl);background:var(--bg-raised);box-shadow:var(--shadow-3);grid-template-rows:auto minmax(0,1fr) auto;gap:0;display:grid;position:relative;overflow:hidden}.stage__paper{background-image:linear-gradient(var(--divider) 1px, transparent 1px), linear-gradient(90deg, var(--divider) 1px, transparent 1px);pointer-events:none;background-size:3.5rem 3.5rem;position:absolute;inset:0}.stage__bar{z-index:2;justify-content:space-between;align-items:center;gap:var(--space-4);min-block-size:3rem;padding-inline:var(--space-5);border-block-end:var(--hairline) solid var(--line);background:color-mix(in srgb, var(--bg-raised) 90%, var(--bg));display:flex;position:relative}.stage__bar-group{align-items:center;gap:var(--space-3);color:var(--subtle);font-family:var(--font-sans);font-size:var(--step-caption);letter-spacing:.06em;display:flex}.stage__meter{border-radius:var(--radius-pill);background:var(--divider);block-size:2px;inline-size:clamp(3rem,12vw,6rem);overflow:hidden}.stage__meter i{background:var(--accent);block-size:100%;inline-size:var(--meter,0%);transition:inline-size var(--dur-slow) var(--ease-ink);display:block}.stage__scroll{z-index:1;align-content:center;gap:clamp(var(--space-4), 2vw, var(--space-6));padding:clamp(var(--space-5), 3.2vw, var(--space-8)) clamp(var(--space-4), 3vw, var(--space-7));min-block-size:clamp(19rem,42vh,24rem);display:grid;position:relative}.stage__past{max-block-size:5.4em;color:var(--muted);text-align:justify;flex-direction:column;justify-content:flex-end;font-size:clamp(.9rem,.84rem + .24vw,1.05rem);line-height:2;display:flex;overflow:hidden;-webkit-mask-image:linear-gradient(#0000 0%,#0000004d 16%,#000000d1 48%,#000 76%);mask-image:linear-gradient(#0000 0%,#0000004d 16%,#000000d1 48%,#000 76%)}.stage__current{gap:var(--space-4);padding-block:clamp(var(--space-4), 2vw, var(--space-6));border-block:var(--hairline) solid var(--divider);display:grid}.stage__line{letter-spacing:.02em;flex-wrap:wrap;justify-content:center;gap:.14em .06em;font-size:clamp(1.35rem,.95rem + 1.7vw,2.3rem);line-height:1.55;display:flex}.stage__future{min-block-size:3.4rem;padding-block:var(--space-2);gap:.7rem;display:grid;-webkit-mask-image:linear-gradient(#000 0%,#00000073 48%,#0000 100%);mask-image:linear-gradient(#000 0%,#00000073 48%,#0000 100%)}.stage__future span{border-radius:var(--radius-pill);background:var(--divider);block-size:.6rem;inline-size:min(100%, calc(var(--glyphs,12) * .8rem));filter:blur(calc(.045rem + var(--order,0) * .055rem));opacity:max(.16, calc(.46 - var(--order,0) * .1));display:block}.token{min-block-size:1.38em;min-inline-size:1.05em;transition:color .15s var(--ease-standard), background-color .15s var(--ease-standard), opacity .15s var(--ease-standard), transform .21s var(--ease-standard);border-radius:.18em;place-items:center;display:inline-grid;position:relative}.token--punctuation{min-inline-size:.62em;color:var(--subtle)}.token--hidden:after{border-radius:var(--radius-pill);background:var(--line-strong);content:"";block-size:.08em;inline-size:.72em}.token--current{background:color-mix(in srgb, var(--accent) 12%, transparent)}.token--current.token--hidden:after{background:var(--accent);box-shadow:0 0 0 .18em color-mix(in srgb, var(--accent) 14%, transparent)}.token--revealed{color:var(--accent)}.token--prompt{color:var(--accent-warm)}.token--prompt:after{border-radius:var(--radius-pill);content:"";opacity:.62;background:currentColor;block-size:.05em;inline-size:.28em;position:absolute;inset-block-end:.07em}.token--incorrect{color:var(--danger);-webkit-text-decoration-color:color-mix(in srgb, var(--danger) 45%, transparent);text-decoration-color:color-mix(in srgb, var(--danger) 45%, transparent);text-underline-offset:.18em;text-decoration-line:underline;text-decoration-style:wavy}.stage__current[data-handoff=out] .stage__line{animation:handoff-out .46s var(--ease-standard) both}.stage__current[data-handoff=in] .stage__line{animation:handoff-in .46s var(--ease-standard) both}@keyframes handoff-out{0%{opacity:1;filter:blur();transform:translate(0,0)}48%,to{opacity:0;filter:blur(.055rem);transform:translateY(-1.35rem)}}@keyframes handoff-in{0%,48%{opacity:0;filter:blur(.055rem);transform:translateY(1.35rem)}to{opacity:1;filter:blur();transform:translate(0,0)}}.stage[data-feedback=correct]{animation:stage-correct var(--dur-slow) var(--ease-standard)}.stage[data-feedback=incorrect]{animation:stage-incorrect var(--dur-slow) var(--ease-standard)}@keyframes stage-correct{50%{border-color:color-mix(in srgb, var(--accent-quiet) 55%, var(--line));box-shadow:0 1.2rem 3.5rem color-mix(in srgb, var(--accent-quiet) 16%, transparent)}}@keyframes stage-incorrect{35%{transform:translate(-.22rem)}70%{transform:translate(.18rem)}}.stage__foot{z-index:2;justify-content:space-between;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-5);border-block-start:var(--hairline) solid var(--line);background:color-mix(in srgb, var(--bg-raised) 90%, var(--bg));color:var(--muted);font-family:var(--font-sans);font-size:var(--step-caption);flex-wrap:wrap;display:flex;position:relative}.stage__keys{align-items:center;gap:var(--space-2);flex-wrap:wrap;display:flex}.stage__playback{align-items:center;gap:var(--space-2);min-inline-size:min(100%,16rem);color:var(--subtle);font-size:var(--step-caption);line-height:1.45;display:inline-flex}.stage__playback i{background:var(--subtle);border-radius:50%;flex:none;block-size:.46rem;inline-size:.46rem;display:block}.stage__playback i[data-autoplay=true]{background:var(--accent-quiet);box-shadow:0 0 0 .18rem color-mix(in srgb, var(--accent-quiet) 12%, transparent)}.key{border:var(--hairline) solid var(--line-strong);border-radius:var(--radius-sm);background:var(--bg);min-block-size:1.7rem;min-inline-size:1.7rem;color:var(--text);font-family:var(--font-sans);transition:background-color var(--dur-instant) var(--ease-standard), border-color var(--dur-instant) var(--ease-standard), transform var(--dur-instant) var(--ease-standard);justify-content:center;align-items:center;padding-inline:.45rem;font-size:.72rem;line-height:1;display:inline-flex}.key[data-pressed=true]{border-color:var(--accent);background:color-mix(in srgb, var(--accent) 16%, var(--bg));color:var(--accent);transform:translateY(1px)}.stage__controls{align-items:center;gap:var(--space-2);flex-wrap:wrap;display:flex}@media (max-width:40rem){.stage__playback{order:3;inline-size:100%}}.stage__control{min-block-size:2rem;padding:.35rem var(--space-4);border:var(--hairline) solid var(--line-strong);border-radius:var(--radius-pill);color:var(--text);font-family:var(--font-sans);font-size:var(--step-caption);transition:border-color var(--dur-fast) var(--ease-standard), background-color var(--dur-fast) var(--ease-standard), color var(--dur-fast) 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