@font-face{font-family:Bodoni Moda Variable;font-style:normal;font-weight:400 900;font-display:swap;src:url(/fonts/bodoni-moda-roman.woff2) format("woff2-variations")}@font-face{font-family:Bodoni Moda Variable;font-style:italic;font-weight:400 900;font-display:swap;src:url(/fonts/bodoni-moda-italic.woff2) format("woff2-variations")}@font-face{font-family:Instrument Sans Variable;font-style:normal;font-weight:400 700;font-display:swap;src:url(/fonts/instrument-sans.woff2) format("woff2-variations")}@font-face{font-family:JetBrains Mono Variable;font-style:normal;font-weight:100 800;font-display:swap;src:url(/fonts/jetbrains-mono-labels.woff2) format("woff2-variations")}@font-face{font-family:Bodoni Fallback;src:local("Georgia");size-adjust:92%;ascent-override:98%;descent-override:24%}@property --bg{syntax: "<color>"; inherits: true; initial-value: #08111f;}@property --fg{syntax: "<color>"; inherits: true; initial-value: #f3ecdf;}@property --muted{syntax: "<color>"; inherits: true; initial-value: rgba(243,236,223,.66);}@property --line{syntax: "<color>"; inherits: true; initial-value: rgba(201,169,110,.28);}@property --accent{syntax: "<color>"; inherits: true; initial-value: #d9bd85;}:root{--midnight: #08111f;--navy: #0e1c33;--navy-2: #16294a;--ivory: #f3ecdf;--ivory-2: #e8dcc6;--ink: #101a2c;--gold: #c9a96e;--gold-hi: #e7d3a6;--gold-lo: #8a6a35;--bg: var(--midnight);--fg: var(--ivory);--muted: rgba(243, 236, 223, .66);--line: rgba(201, 169, 110, .28);--accent: #d9bd85;--f-display: "Bodoni Moda Variable", "Bodoni Fallback", "Didot", "Bodoni 72", Georgia, serif;--f-text: "Instrument Sans Variable", "Instrument Sans", ui-sans-serif, system-ui, sans-serif;--f-mono: "JetBrains Mono Variable", "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;--pad: clamp(20px, 5vw, 96px);--max: 1440px;--ease: cubic-bezier(.16, 1, .3, 1);--ease-io: cubic-bezier(.77, 0, .175, 1);--radius: 22px;--fs-hero: clamp(3.4rem, 8.6vw, 10rem);--fs-h2: clamp(2.35rem, 5.2vw, 5.4rem);--fs-h3: clamp(1.55rem, 2.3vw, 2.25rem);--fs-lede: clamp(1.125rem, 1.35vw, 1.375rem);--fs-body: clamp(1.0625rem, 1.05vw, 1.125rem);--fs-mono: .75rem}body[data-theme=light]{--bg: var(--ivory);--fg: var(--ink);--muted: rgba(16, 26, 44, .68);--line: rgba(122, 92, 44, .34);--accent: #7a5c2c}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;text-size-adjust:100%}body,h1,h2,h3,p,figure,blockquote,dl,dd,ol,ul{margin:0}ol[role=list],ul[role=list]{list-style:none;padding:0}img,svg,canvas{display:block;max-width:100%}button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;padding:0}a{color:inherit;text-decoration:none}cite{font-style:italic}body{background-color:var(--bg);color:var(--fg);font-family:var(--f-text);font-size:var(--fs-body);line-height:1.6;font-feature-settings:"kern","liga";-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;overflow-x:clip;transition:--bg .9s var(--ease),--fg .9s var(--ease),--muted .9s var(--ease),--line .9s var(--ease),--accent .9s var(--ease)}::selection{background:var(--gold);color:var(--midnight)}:focus-visible{outline:2px solid var(--gold);outline-offset:4px;border-radius:4px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.skip{position:fixed;left:16px;top:-60px;z-index:200;background:var(--gold);color:var(--midnight);padding:12px 18px;border-radius:999px;font-weight:600;transition:top .3s var(--ease)}.skip:focus{top:16px}.display{font-family:var(--f-display);font-weight:400;font-optical-sizing:auto;letter-spacing:-.015em}.display em,.h2 em,.h3 em{font-style:italic;color:var(--accent)}.mono{font-family:var(--f-mono);font-size:var(--fs-mono);letter-spacing:.16em;text-transform:uppercase;font-weight:500}.h2{font-size:var(--fs-h2);line-height:.98;letter-spacing:-.025em;text-wrap:balance}.h3{font-size:var(--fs-h3);line-height:1.08;text-wrap:balance}.lede{font-size:var(--fs-lede);line-height:1.55;color:var(--muted);max-width:56ch;text-wrap:pretty}p{text-wrap:pretty}.kicker{display:inline-flex;align-items:center;gap:14px;color:var(--accent);margin-bottom:clamp(20px,2.4vw,32px)}.kicker span{font-family:var(--f-display);font-size:1.05rem;letter-spacing:0;text-transform:none;font-style:italic;display:inline-grid;place-items:center;width:34px;height:34px;border:1px solid var(--line);border-radius:50%}.eyebrow{display:flex;align-items:center;gap:14px;color:var(--accent)}.eyebrow__rule{width:44px;height:1px;background:currentColor}.line-mask{overflow:clip;padding-bottom:.08em;margin-bottom:-.08em}.link{background:linear-gradient(currentColor,currentColor) 0 100% / 100% 1px no-repeat;padding-bottom:2px;transition:background-size .5s var(--ease),color .3s}.link:hover{background-size:0 1px;background-position:100% 100%;color:var(--accent)}.link--arrow span{display:inline-block;transition:transform .5s var(--ease)}.link--arrow:hover span{transform:translate(4px)}.roll span{display:inline-block;position:relative;overflow:hidden;vertical-align:top}.roll span:after{content:attr(data-text);position:absolute;left:0;top:100%;color:var(--accent)}.roll span,.btn__label span{transition:transform .55s var(--ease)}.roll:hover span{transform:translateY(-100%)}.btn{--h: 54px;position:relative;display:inline-flex;align-items:center;justify-content:center;gap:14px;height:var(--h);padding:0 28px;border-radius:999px;font-family:var(--f-text);font-weight:600;font-size:1rem;letter-spacing:.01em;isolation:isolate;overflow:hidden;white-space:nowrap;transition:transform .5s var(--ease),box-shadow .5s var(--ease),background-color .4s}.btn--sm{--h: 44px;padding:0 20px;font-size:.9375rem}.btn--lg{--h: 64px;padding:0 34px;font-size:1.0625rem}.btn__label{position:relative;display:inline-block;overflow:hidden;height:1.3em;line-height:1.3em}.btn__label span{display:inline-block}.btn__label span:after{content:attr(data-text);position:absolute;left:0;top:100%}.btn:hover .btn__label span{transform:translateY(-100%)}.btn__arrow{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;font-size:.85rem;transition:transform .5s var(--ease)}.btn:hover .btn__arrow{transform:translate(2px,-2px) rotate(0) scale(1.08)}.btn:before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(110deg,transparent 30%,rgba(255,255,255,.55) 48%,transparent 62%);transform:translate(-120%);transition:transform .9s var(--ease)}.btn:hover:before{transform:translate(120%)}.btn--gold{background:linear-gradient(180deg,#e2c992 0%,var(--gold) 55%,#b8955a 100%);color:var(--midnight);box-shadow:0 1px #ffffff73 inset,0 10px 30px -12px #c9a96eb3}.btn--gold .btn__arrow{background:var(--midnight);color:var(--gold-hi)}.btn--gold:hover{box-shadow:0 1px #ffffff73 inset,0 18px 44px -14px #c9a96ee6}.btn--ink{background:var(--ink);color:var(--ivory);box-shadow:0 14px 34px -18px #101a2ccc}.btn--ink .btn__arrow{background:var(--gold);color:var(--ink)}.btn--ink:before{background:linear-gradient(110deg,transparent 30%,rgba(231,211,166,.35) 48%,transparent 62%)}.btn:active{transform:scale(.98)}#gl{position:fixed;inset:0;width:100vw;height:100vh;height:100lvh;z-index:0;pointer-events:none}main,.footer{position:relative;z-index:1}.grain{position:fixed;inset:0;z-index:90;pointer-events:none;opacity:.045;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}.nav{position:fixed;top:0;left:0;right:0;z-index:60;display:flex;align-items:center;gap:28px;padding:18px var(--pad);transition:transform .6s var(--ease),background-color .5s,backdrop-filter .5s,padding .5s var(--ease)}.nav.is-scrolled{background:color-mix(in srgb,var(--bg) 72%,transparent);backdrop-filter:blur(14px) saturate(1.2);-webkit-backdrop-filter:blur(14px) saturate(1.2);padding-top:12px;padding-bottom:12px;box-shadow:0 1px 0 var(--line)}.nav.is-hidden{transform:translateY(-110%)}.nav__brand{display:flex;align-items:center;gap:12px;margin-right:auto}.nav__mark{width:30px;height:30px;color:var(--accent)}.nav__word{font-family:var(--f-display);font-size:1.12rem;letter-spacing:-.01em;line-height:1}.nav__word .mono{font-size:.62rem;margin-right:4px;color:var(--accent);vertical-align:.2em}.nav__links{display:flex;gap:30px;font-size:.9375rem}.nav__links a{color:var(--fg);opacity:.86}.nav__links a:hover{opacity:1}.nav__menu{display:none;width:44px;height:44px;position:relative;border:1px solid var(--line);border-radius:50%}.nav__menu i{position:absolute;left:13px;right:13px;height:1px;background:currentColor;transition:transform .5s var(--ease)}.nav__menu i:first-of-type{top:18px}.nav__menu i:last-of-type{top:25px}.nav__menu[aria-expanded=true] i:first-of-type{transform:translateY(3.5px) rotate(45deg)}.nav__menu[aria-expanded=true] i:last-of-type{transform:translateY(-3.5px) rotate(-45deg)}.menu{position:fixed;inset:0;z-index:55;background:var(--midnight);color:var(--ivory);padding:110px var(--pad) 40px;display:flex;flex-direction:column;justify-content:space-between}.menu[hidden]{display:none}.menu ul{list-style:none;padding:0}.menu li a{display:block;font-family:var(--f-display);font-size:clamp(2.2rem,9vw,3.4rem);line-height:1.2;border-bottom:1px solid rgba(201,169,110,.2);padding:8px 0}.menu .btn{align-self:stretch}.rail{position:fixed;left:26px;top:50%;transform:translateY(-50%);z-index:40;height:46vh;display:none}.rail__track{position:absolute;left:0;top:0;bottom:0;width:1px;background:var(--line)}.rail__fill{position:absolute;inset:0;background:linear-gradient(to bottom,transparent,var(--gold) 20%,var(--gold-hi));transform-origin:top;transform:scaleY(0);box-shadow:0 0 12px #e7d3a699}.rail__ticks{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:space-between;list-style:none;padding:0}.rail__ticks a{display:grid;place-items:center;width:26px;height:26px;margin-left:-13px;border-radius:50%;background:var(--bg);border:1px solid var(--line);font-size:.55rem;letter-spacing:.05em;color:var(--muted);transition:color .4s,border-color .4s,background-color .9s var(--ease)}.rail__ticks a.is-active,.rail__ticks a:hover{color:var(--accent);border-color:var(--accent)}.cursor{position:fixed;left:0;top:0;z-index:95;pointer-events:none;width:84px;height:84px;margin:-42px 0 0 -42px;border-radius:50%;border:1px solid var(--gold);display:grid;place-items:center;opacity:0;transform:scale(.4);transition:opacity .35s,transform .5s var(--ease);background:#08111f59;backdrop-filter:blur(4px)}.cursor__label{color:var(--gold-hi);font-size:.62rem}.cursor.is-on{opacity:1;transform:scale(1)}.cursor.is-down{transform:scale(.82)}.loader{position:fixed;inset:0;z-index:100;background:var(--midnight);color:var(--ivory);display:grid;place-items:center;pointer-events:none}.intro-seen .loader,html:not(.js) .loader{display:none}.loader__drop{position:absolute;left:50%;top:0;width:1px;height:50vh;background:linear-gradient(to bottom,transparent,var(--gold-hi));transform-origin:top;transform:scaleY(0)}.loader__title{font-family:var(--f-display);font-size:clamp(1.8rem,4vw,3.4rem);letter-spacing:-.01em;overflow:hidden;display:flex;gap:.28em;flex-wrap:wrap;justify-content:center;padding:0 20px;text-align:center}.loader__title em{color:var(--gold-hi)}.loader__title>*{display:inline-block}.loader__count{position:absolute;right:var(--pad);bottom:32px;color:var(--gold)}.book-anchor{position:relative;touch-action:pan-y}.book-fallback{position:absolute;inset:0;margin:auto;height:86%;width:auto;max-width:100%;object-fit:contain;transform:perspective(1400px) rotateY(18deg);border-radius:2px 6px 6px 2px;box-shadow:30px 40px 70px -30px #000000b3,1px 0 #fff6 inset;transition:opacity .45s ease-out}.gl-ready .book-fallback{opacity:0}.book-hint{position:absolute;left:50%;bottom:-6px;transform:translate(-50%);color:var(--muted);font-size:.6rem;opacity:0;transition:opacity .6s;white-space:nowrap}.gl-ready .book-hint{opacity:.8}@media(pointer:fine){.gl-ready [data-drag]{cursor:grab}.gl-ready [data-drag]:active{cursor:grabbing}}.hero{position:relative;min-height:100vh;min-height:100svh;display:grid;grid-template-columns:repeat(12,1fr);column-gap:24px;align-items:center;padding:120px var(--pad) 90px;max-width:var(--max);margin:0 auto}.hero__copy{grid-column:1 / span 8;grid-row:1;position:relative;z-index:2}.hero__title{font-size:var(--fs-hero);line-height:.86;letter-spacing:-.035em;margin:26px 0 30px;font-variation-settings:"opsz" 96}.hero__line{display:block}.hero__line--accent{padding-left:.9em}.hero__line--accent em{color:var(--gold-hi);font-weight:400}.hero__sub{font-size:clamp(1.2rem,1.65vw,1.6rem);line-height:1.45;max-width:30ch;color:var(--fg);opacity:.9;font-family:var(--f-display);font-style:italic}.hero__ctas{display:flex;flex-wrap:wrap;align-items:center;gap:18px 28px;margin-top:38px}.hero__formats{display:flex;align-items:center;gap:18px;font-size:.95rem}.hero__formats .mono{color:var(--muted);font-size:.66rem}.hero__meta{display:flex;flex-wrap:wrap;gap:14px 40px;margin-top:48px;padding-top:22px;border-top:1px solid var(--line);max-width:640px}.hero__meta dt{color:var(--accent);font-size:.62rem;margin-bottom:6px}.hero__meta dd{color:var(--fg);letter-spacing:.08em;font-size:.72rem}.book-anchor--hero{grid-column:8 / span 5;grid-row:1;height:min(76vh,760px);z-index:1}.hero__cue{position:absolute;left:50%;bottom:26px;transform:translate(-50%);display:flex;flex-direction:column;align-items:center;gap:12px;color:var(--muted);font-size:.62rem}.hero__cue-line{width:1px;height:46px;background:linear-gradient(var(--gold),transparent);transform-origin:top;animation:drip 2.4s var(--ease-io) infinite}@keyframes drip{0%{transform:scaleY(0);opacity:1}60%{transform:scaleY(1);opacity:1}to{transform:scaleY(1) translateY(30%);opacity:0}}.forces,.method,.inside,.author,.editions,.faq,.finale,.assess{position:relative;max-width:var(--max);margin:0 auto;padding:clamp(110px,14vw,200px) var(--pad)}.chapter-head{max-width:1100px;margin-bottom:clamp(56px,8vw,120px)}.chapter-head .lede{margin-top:28px}.chapter-head--split{max-width:none;display:grid;grid-template-columns:7fr 5fr;gap:40px;align-items:end}.forces__grid{display:grid;grid-template-columns:5fr 7fr;gap:clamp(24px,6vw,120px)}.forces__stage{position:sticky;top:12vh;height:76vh;align-self:start}.book-anchor--forces{height:100%}.forces__counter{position:absolute;left:0;bottom:0;color:var(--accent)}.forces__list{counter-reset:f}.force{min-height:78vh;display:flex;flex-direction:column;justify-content:center;padding:60px 0;border-top:1px solid var(--line);position:relative}.force:first-child{border-top:0}.force__num{color:var(--accent);margin-bottom:18px}.force .h3{font-size:clamp(2rem,3.4vw,3.4rem);line-height:1.02;margin-bottom:22px;max-width:16ch}.force p:not(.force__num):not(.force__q){color:var(--muted);max-width:48ch}.force__q{margin-top:22px;font-family:var(--f-display);font-style:italic;font-size:1.25rem;color:var(--fg);padding-left:18px;border-left:1px solid var(--gold);max-width:40ch}.force__leak{width:70px;height:128px;margin-bottom:26px}.force__leak svg{width:100%;height:100%;overflow:visible}.leak-stream,.leak-drip{fill:none;stroke:var(--gold);stroke-width:1.5;stroke-linecap:round}.leak-drip{stroke-dasharray:2 9;animation:leak 1.6s linear infinite;opacity:.9}.leak-drip--2{animation-duration:2.1s;opacity:.55}@keyframes leak{to{stroke-dashoffset:-44}}.force__figure{font-size:clamp(3.6rem,8vw,7.6rem);line-height:.9;letter-spacing:-.04em;color:var(--gold-hi);margin-bottom:24px;font-variant-numeric:lining-nums tabular-nums;display:flex;align-items:flex-start}.force__currency,.force__plus{font-size:.45em;margin-top:.12em;color:var(--accent)}.force__figure--neq{font-size:clamp(2.4rem,5vw,4.6rem);gap:.3em;align-items:baseline;flex-wrap:wrap;color:var(--fg)}.force__figure--neq span{color:var(--accent);font-style:normal}.force__figure--neq em{color:var(--gold-hi)}.chapter-close{margin-top:clamp(70px,10vw,140px);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:30px;padding-top:40px;border-top:1px solid var(--line)}.chapter-close__text{font-size:clamp(1.8rem,3.4vw,3.2rem);line-height:1.05;max-width:22ch}.method__head{max-width:1100px;margin-bottom:clamp(40px,6vw,80px)}.method__head .lede{margin-top:28px}.method__pin{display:grid;grid-template-columns:5fr 7fr;gap:clamp(24px,5vw,80px);align-items:center;min-height:100vh}.falls{grid-column:2;grid-row:1;height:min(84vh,760px)}.falls__svg{width:100%;height:100%;overflow:visible}.falls__basin{fill:none;stroke:var(--ink);stroke-width:1.4}.falls__fill{fill:url(#gold-fill)}.falls__surface{fill:#fff6df;opacity:0}.falls__stream{fill:none;stroke:#b8955a;stroke-width:3;stroke-linecap:round;filter:drop-shadow(0 0 6px rgba(201,169,110,.8))}.falls__label{font-family:var(--f-display);font-style:italic;font-size:22px;fill:var(--accent)}.tiers{grid-column:1;grid-row:1;display:grid;gap:10px}.tier{padding:26px 0 26px 28px;border-left:1px solid var(--line);transition:color .6s var(--ease);position:relative;color:var(--muted)}.tier .h3 em{color:inherit;transition:color .6s var(--ease)}.tier.is-active,.tier.is-done{color:var(--fg)}.tier.is-active .h3 em{color:var(--accent)}.tier:before{content:"";position:absolute;left:-1px;top:0;bottom:0;width:2px;background:var(--gold);transform:scaleY(0);transform-origin:top;transition:transform .8s var(--ease)}.tier.is-active:before,.tier.is-done:before{transform:scaleY(1)}.tier__num{color:var(--accent);margin-bottom:10px}.tier .h3{margin-bottom:10px}.tier p:last-child{color:var(--muted);max-width:42ch}.learn{margin-top:clamp(80px,10vw,150px)}.learn__title{color:var(--accent);margin-bottom:26px}.learn__list{display:grid;grid-template-columns:1fr 1fr;column-gap:clamp(24px,5vw,80px);border-top:1px solid var(--line)}.learn__list li{display:grid;grid-template-columns:56px 1fr;align-items:baseline;gap:10px;padding:26px 0;border-bottom:1px solid var(--line);font-family:var(--f-display);font-size:clamp(1.25rem,1.75vw,1.6rem);line-height:1.25;transition:padding-left .5s var(--ease)}.learn__list li:hover{padding-left:10px}.learn__n{color:var(--accent)}.learn__cta{display:flex;flex-wrap:wrap;align-items:center;gap:22px 30px;margin-top:44px}.learn__for{color:var(--muted)}.inside__grid{display:grid;grid-template-columns:4fr 4fr 4fr;gap:clamp(20px,3vw,56px);align-items:center;min-height:70vh}.previews{display:flex;flex-direction:column;border-top:1px solid var(--line)}.preview{display:grid;grid-template-columns:44px 1fr auto;align-items:baseline;text-align:left;padding:22px 0;border-bottom:1px solid var(--line);color:var(--muted);transition:color .4s,padding-left .6s var(--ease);position:relative}.preview:after{content:"";position:absolute;left:0;bottom:-1px;height:1px;width:100%;background:var(--gold);transform:scaleX(0);transform-origin:left;transition:transform .7s var(--ease)}.preview:hover,.preview[aria-selected=true]{color:var(--fg);padding-left:10px}.preview[aria-selected=true]:after{transform:scaleX(1)}.preview__n{color:var(--accent);font-size:.65rem}.preview__t{font-size:clamp(1.5rem,2.2vw,2.1rem);line-height:1.1}.preview[aria-selected=true] .preview__t{font-style:italic;color:var(--gold-hi)}.preview__k{font-size:.6rem;opacity:.7}.inside__stage{height:min(68vh,620px)}.book-anchor--inside{height:100%}.pages{position:relative}.page{display:grid;gap:22px}.page[hidden]{display:none}.page__q{font-size:clamp(1.7rem,2.6vw,2.5rem);line-height:1.12;font-style:italic;color:var(--gold-hi)}.page p:not(.page__q){color:var(--muted);max-width:44ch}.pages__note{margin:30px 0;color:var(--muted);font-size:.62rem;line-height:1.8;max-width:46ch;letter-spacing:.12em}.author__grid{display:grid;grid-template-columns:5fr 7fr;gap:clamp(30px,6vw,120px);align-items:start}.author__portrait{position:sticky;top:14vh}.author__frame{aspect-ratio:1122 / 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