.journey{width:100vw;margin-inline:calc(50% - 50vw)}.stage{color:var(--color-text);position:relative}.stage--css,.stage--webgl{min-height:165vh}.stage--interstitial{align-items:center;min-height:90vh;display:flex}.stage__frame{align-items:center;min-height:100vh;display:flex;position:sticky;top:0;overflow:hidden}.stage--interstitial .stage__frame{width:100%;min-height:0;position:relative}.stage__content{z-index:var(--z-content);width:100%;max-width:var(--width-content);padding:var(--space-16) var(--space-4);margin:0 auto;position:relative}.zoom-stage .stage__content:before{--stage-scrim-feather:linear-gradient(to bottom, transparent 0, #000 3rem, #000 calc(100% - 3rem), transparent 100%);content:"";z-index:-1;pointer-events:none;background:linear-gradient(90deg, #050810e0 0, #050810db calc(var(--width-reading) - 1rem), #05081000 calc(var(--width-reading) + 12rem));-webkit-mask-image:var(--stage-scrim-feather);-webkit-mask-image:var(--stage-scrim-feather);mask-image:var(--stage-scrim-feather);position:absolute;inset:-3rem -2rem}.zoom-stage[data-align=right] .stage__content:before,.zoom-stage[data-align=upper-right] .stage__content:before,.zoom-stage[data-align=lower-right] .stage__content:before{background:linear-gradient(270deg, #050810e0 0, #050810db calc(var(--width-reading) - 1rem), #05081000 calc(var(--width-reading) + 12rem))}.zoom-stage[data-align=center] .stage__content:before{background:linear-gradient(90deg,#05081000 0,#050810db 6rem calc(100% - 6rem),#05081000 100%)}.stage__content>*{max-width:var(--width-reading)}.stage__kicker{font-family:var(--font-data);font-size:var(--text-sm);letter-spacing:.12em;text-transform:uppercase;color:var(--color-accent);margin-bottom:var(--space-3)}.stage__lede{font-size:var(--text-lg);color:var(--color-text-muted)}.stage__subheading{margin-top:var(--space-8)}.stage__description{font-size:var(--text-lg)}.stage__level{align-items:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.stage__actions{gap:var(--space-3);margin-top:var(--space-6);flex-wrap:wrap;display:flex}.stage__product{font-size:var(--text-lg);margin-top:var(--space-4)}.stage__hero-actions{margin-top:var(--space-6)}.stage__forthcoming{align-items:inherit;gap:var(--space-2);margin-top:var(--space-6);flex-direction:column;display:flex}.forthcoming-badge{padding:0 var(--space-3);border:1px dashed var(--color-border);border-radius:var(--radius-full);font-size:var(--text-sm);color:var(--color-text-muted);font-weight:600;display:inline-block}.stage__forthcoming-note{font-size:var(--text-sm);color:var(--color-text-muted)}.level-badge{padding:0 var(--space-3);border-radius:var(--radius-full);border:1px solid var(--color-border);font-size:var(--text-sm);font-weight:600;display:inline-block}.level-badge--beginner{border-color:var(--level-beginner);color:var(--level-beginner)}.level-badge--intermediate{border-color:var(--level-intermediate);color:var(--level-intermediate)}.level-badge--expert{border-color:var(--level-expert);color:var(--level-expert)}.level-badge--all{color:var(--color-text-muted)}.button{padding:var(--space-2) var(--space-6);border-radius:var(--radius-md);background:var(--color-accent);color:var(--color-accent-contrast);border:1px solid #0000;min-height:44px;font-weight:600;line-height:1.9;text-decoration:none;display:inline-block}.button:hover{filter:brightness(1.08);color:var(--color-accent-contrast)}.button--ghost{color:var(--color-link);border-color:var(--color-border);background:0 0}.button--ghost:hover{color:var(--color-link-hover);border-color:var(--color-link)}.stage-visual,.stage-bg{z-index:var(--z-scene);pointer-events:none;position:absolute;inset:0}.stage--interstitial .stage-bg{position:absolute;inset:0}.stage--atmosphere,.stage--earth-moon,.stage--solar-system,.stage--nearby-stars,.stage--milky-way,.stage--galaxies,.stage--cosmic-web,.zoom-stage{--color-bg:#0a0e1a;--color-surface:#0e1424;--color-surface-raised:#16203a;--color-border:#2c3a5c;--color-text:#e8eaf2;--color-text-muted:#aab2c8;--color-link:#a9c1e8;--color-link-hover:#cdddf5;--color-accent:#c9a227;--color-accent-contrast:#101010;--color-focus-ring:#e3c96a;--color-notice-bg:#16203a;--color-notice-border:#c9a227;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}.stage--earth-clouds{color:var(--ink-900);background:linear-gradient(#dcebfa 0%,#a9c1e8 35%,#4a6fb5 75%,#223052 100%)}.stage--earth-clouds .stage__kicker{color:var(--gold-600)}.stage--earth-clouds .stage__lede{color:var(--ink-700)}.stage--atmosphere{background:linear-gradient(#223052 0%,#16203a 60%,#0e1424 100%)}.stage--earth-moon{background:#0a0e1a}.stage--solar-system{background:radial-gradient(at 50% 45%,#101a30 0%,#0a0e1a 70%)}.stage--nearby-stars{background:#0a0e1a}.stage--milky-way{background:linear-gradient(160deg,#0a0e1a 0%,#131b33 45%,#0a0e1a 100%)}.stage--galaxies{background:#070a13}.stage--cosmic-web{background:radial-gradient(at 50% 20%,#101a30 0%,#070a13 75%)}.stage-bg--atmosphere,.stage-bg--earth-moon,.stage-bg--nearby-stars,.stage-bg--milky-way,.stage-bg--galaxies,.stage-bg--cosmic-web{opacity:.7;background-image:radial-gradient(1.5px 1.5px at 12% 22%,#cdddf5 50%,#0000 51%),radial-gradient(1px 1px at 28% 64%,#aab2c8 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50%,#0000 51%),radial-gradient(3px 3px at 61% 58%,#a9c1e8 50%,#0000 51%),radial-gradient(3px 3px at 81% 26%,#cdddf5 50%,#0000 51%),radial-gradient(3px 3px at 38% 76%,#a9c1e8 50%,#0000 51%);background-size:420px 340px,380px 300px,460px 380px,100% 100%,100% 100%,100% 100%,100% 100%;position:absolute;inset:0}.clouds__sky{background:linear-gradient(#274b8f 0%,#4a6fb5 26%,#7ea8dc 48%,#b8d2ee 66%,#f2d9b0 84%,#f7c98a 100%);position:absolute;inset:0}.clouds__sun{background:radial-gradient(60% 45% at 74% 74%,#fff4daf2 0%,#ffe2a880 28%,#ffd68c2e 52%,#0000 70%);position:absolute;inset:0}.clouds__haze{background:linear-gradient(#0000 55%,#f4e2c647 78%,#f7d6a66b 100%),radial-gradient(120% 30% at 50% 100%,#ffeccc4d,#0000 70%);position:absolute;inset:0}.clouds__drift{width:200%;display:flex;position:absolute;left:0;right:0}.clouds__drift svg{flex:none;width:50%;height:100%}.clouds__drift--0{color:#e6edf8;height:30%;translate:0 calc(var(--p,0) * 9rem);animation:240s linear infinite cloud-drift;bottom:26%}.clouds__drift--1{color:#f3f7fd;height:36%;translate:0 calc(var(--p,0) * 14rem);animation:150s linear infinite reverse cloud-drift;bottom:12%}.clouds__drift--2{color:#fff;height:42%;translate:0 calc(var(--p,0) * 20rem);animation:90s linear infinite cloud-drift;bottom:-2%}@keyframes cloud-drift{0%{transform:translate(0,0)}to{transform:translate(-50%)}}.clouds__limb{height:64vh;transform:translateY(calc(var(--p,0) * -7rem));background:linear-gradient(#35598f 0%,#223052 40%,#131b33 100%);border-radius:50% 50% 0 0;position:absolute;bottom:-52vh;left:-25%;right:-25%}.clouds__limb-glow{filter:blur(6px);background:linear-gradient(#7ea8dc00,#a8cdf5e6,#7ea8dc00);border-radius:50% 50% 0 0;height:30px;position:absolute;inset:-14px 0 auto}.solar{perspective:1300px;justify-content:center;align-items:center;display:flex}.solar__tilt{aspect-ratio:1;width:min(160vh,140vw);transform:rotateX(58deg) translateY(calc(var(--p,0) * -4rem));transform-style:preserve-3d;margin-top:6vh}.solar__plane{transform-style:preserve-3d;position:absolute;inset:0}.solar__sun{aspect-ratio:1;background:radial-gradient(circle,#fff0c8f2 0%,#e3c96a8c 34%,#c9a2272e 62%,#0000 78%);border-radius:50%;width:8%;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.solar__sun-core{background:radial-gradient(circle at 40% 38%,#fff7e0,#f0d488 55%,#d9ab3c);border-radius:50%;position:absolute;inset:30%;box-shadow:0 0 34px 10px #e3c96a8c}.solar__ring{border:1px solid #7ea8dc52;border-radius:50%;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);box-shadow:inset 0 0 12px #4a6fb51f}.solar__orbit{rotate:var(--orbit-offset,0deg);transform-style:preserve-3d;animation-name:solar-orbit;animation-timing-function:linear;animation-iteration-count:infinite;position:absolute;inset:0}@keyframes solar-orbit{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.solar__anchor{transform-style:preserve-3d;rotate:calc(var(--orbit-offset,0deg) * -1);animation:linear infinite solar-orbit-counter;animation-duration:var(--orbit-duration,100s);position:absolute;top:50%}@keyframes solar-orbit-counter{0%{transform:rotate(0)}to{transform:rotate(-360deg)}}.solar__planet{border-radius:50%;transform:translate(-50%,-50%)rotateX(-58deg);box-shadow:0 0 10px #cdddf540}.solar__planet--ringed:after{content:"";border:2px solid #d9c69abf;border-top-color:#d9c69a59;border-radius:50%;width:210%;height:44%;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)rotate(-14deg)}.webgl-stage__canvas{position:absolute;inset:0}.webgl-stage__canvas canvas{width:100%;height:100%;display:block}.webgl-stage__note{bottom:var(--space-3);right:var(--space-3);font-size:var(--text-sm);color:var(--color-text-muted);position:absolute}.progress-rail{right:var(--space-3);z-index:var(--z-overlay);align-items:flex-end;gap:var(--space-3);flex-direction:column;display:flex;position:fixed;top:50%;transform:translateY(-50%)}.progress-rail ol{gap:var(--space-2);flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.progress-rail__dot{justify-content:center;align-items:center;width:44px;height:28px;text-decoration:none;display:flex;position:relative}.progress-rail__dot:before{content:"";border-radius:var(--radius-full);border:1px solid var(--color-text-muted);width:10px;height:10px;transition:background var(--motion-duration-fast) var(--motion-ease-out);background:0 0}.progress-rail__dot[aria-current=location]:before{background:var(--color-accent);border-color:var(--color-accent)}.progress-rail__label{margin-right:var(--space-2);white-space:nowrap;font-size:var(--text-sm);color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:0 var(--space-2);opacity:0;position:absolute;right:100%}.progress-rail__dot:hover .progress-rail__label,.progress-rail__dot:focus-visible .progress-rail__label{opacity:1}.journey-skip-button{font:inherit;font-size:var(--text-sm);background:var(--color-surface);color:var(--color-text);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-2) var(--space-3);cursor:pointer;min-height:44px}.journey-skip-button:hover{border-color:var(--color-accent)}.journey-skip-banner{gap:var(--space-4);padding:var(--space-3) var(--space-4);background:var(--color-notice-bg);border-bottom:1px solid var(--color-border);font-size:var(--text-sm);flex-wrap:wrap;justify-content:center;align-items:center;display:flex}@media (max-width:831px){:root{--journey-rail-height:76px}html{scroll-padding-bottom:var(--journey-rail-height)}.stage:last-of-type{padding-bottom:var(--journey-rail-height)}.progress-rail{background:var(--color-surface);border-top:1px solid var(--color-border);width:100%;padding:var(--space-1) var(--space-3);min-height:var(--journey-rail-height);box-sizing:border-box;flex-direction:row;justify-content:space-between;align-items:center;inset:auto auto 0 0;transform:none}.progress-rail ol{scrollbar-width:none;flex-direction:row;flex:auto;gap:0;min-width:0;overflow-x:auto}.progress-rail ol::-webkit-scrollbar{display:none}.progress-rail li{flex:auto;min-width:24px;max-width:44px}.progress-rail__dot{width:100%}.progress-rail__label{clip-path:inset(50%);white-space:nowrap;opacity:1;background:0 0;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.journey-skip-button{min-height:40px}}[data-journey=skipped] .stage{min-height:0}[data-journey=skipped] .stage__frame{min-height:0;position:relative}[data-journey=skipped] .stage-visual,[data-journey=skipped] .stage-bg{display:none}[data-journey=skipped] .stage__content{padding:var(--space-8) var(--space-4)}[data-motion=reduced] .clouds__drift,[data-motion=reduced] .clouds__limb{animation:none;transform:translate(0,0)}[data-motion=reduced] .solar__tilt{transform:rotateX(58deg)}[data-motion=reduced] .solar__orbit,[data-motion=reduced] .solar__anchor,[data-motion=reduced] .cosmic-web__node{animation:none}@media (prefers-reduced-motion:reduce){.clouds__drift,.clouds__limb{animation:none;transform:translate(0,0)}.solar__tilt{transform:rotateX(58deg)}.solar__orbit,.solar__anchor,.cosmic-web__node{animation:none}}.mock-card{background:color-mix(in srgb, var(--color-surface) 92%, transparent);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-6);margin:var(--space-6) 0;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.mock-card__badge{font-family:var(--font-data);font-size:var(--text-sm);letter-spacing:.08em;text-transform:uppercase;color:var(--color-accent);border:1px dashed var(--color-accent);border-radius:var(--radius-full);padding:0 var(--space-3);margin-bottom:var(--space-3);display:inline-block}.mock-card__explain,.mock-card__privacy{font-size:var(--text-sm);color:var(--color-text-muted)}.mock-card__unavailable{color:var(--color-accent);font-weight:600}.mock-card__byline{color:var(--color-text-muted);margin-top:calc(var(--space-2) * -1)}.mock-card fieldset{border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-4);margin:0 0 var(--space-4)}.mock-card .field{gap:var(--space-1);margin-bottom:var(--space-3);flex-direction:column;display:flex}.mock-card input,.mock-card select{font:inherit;color:var(--color-text);background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:var(--space-2) var(--space-3);min-height:44px}.mock-card__meta{gap:var(--space-3);margin:var(--space-4) 0;grid-template-columns:repeat(auto-fit,minmax(10rem,1fr));display:grid}.mock-card__meta dt{font-size:var(--text-sm);text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-muted)}.mock-card__meta dd{margin:0}.site-header__tools{align-items:center;gap:var(--space-2) var(--space-3);flex-wrap:wrap;justify-content:flex-end;margin-left:auto;display:flex}.search-trigger,.motion-toggle,.theme-toggle{font:inherit;font-size:var(--text-sm);color:var(--color-text-muted);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-2) var(--space-3);cursor:pointer;background:0 0;min-height:44px}.search-trigger:hover,.motion-toggle:hover,.theme-toggle:hover{color:var(--color-text);border-color:var(--color-accent)}.theme-toggle{justify-content:center;align-items:center;min-width:44px;display:inline-flex}.language-switcher,.language-switcher details{position:relative}.language-switcher__trigger{justify-content:center;align-items:center;gap:var(--space-1);min-width:44px;min-height:44px;padding:var(--space-2) var(--space-3);font-size:var(--text-sm);font-family:var(--font-data);color:var(--color-text-muted);border:1px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer;background:0 0;list-style:none;display:inline-flex}.language-switcher__trigger::-webkit-details-marker{display:none}.language-switcher__trigger::marker{content:""}.language-switcher__trigger:after{content:"";border-bottom:1px solid;border-right:1px solid;width:.4rem;height:.4rem;transform:translateY(-.1rem)rotate(45deg)}.language-switcher__trigger:hover,.language-switcher details[open] .language-switcher__trigger{color:var(--color-text);border-color:var(--color-accent)}.language-switcher details[open] .language-switcher__trigger:after{transform:translateY(.1rem)rotate(-135deg)}.language-switcher__menu{z-index:40;top:calc(100% + var(--space-2));min-width:11rem;max-width:calc(100vw - 2rem);padding:var(--space-1);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);margin:0;list-style:none;position:absolute;right:0;box-shadow:0 12px 32px #03060e73}:root[data-theme=light] .language-switcher__menu{box-shadow:0 12px 28px #3f33212e}.language-switcher__link{align-items:center;gap:var(--space-3);min-height:44px;padding:var(--space-2) var(--space-3);border-radius:var(--radius-sm);font-size:var(--text-sm);color:var(--color-text-muted);text-decoration:none;display:flex}.language-switcher__code{font-family:var(--font-data);min-width:1.8rem}.language-switcher__name{overflow-wrap:anywhere}.language-switcher__link:hover{color:var(--color-text);background:var(--color-surface-raised)}.language-switcher__link[aria-current]{color:var(--color-text);background:var(--color-surface-raised);font-weight:600}.search-trigger kbd{font-family:var(--font-data);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:0 var(--space-1);text-align:center;min-width:3.4rem;font-size:.75rem;display:inline-block}.motion-note{font-size:var(--text-sm);color:var(--color-text-muted)}@media (max-width:831px){.search-trigger kbd{display:none}.motion-toggle,.motion-note{font-size:.75rem}}.search-overlay{border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);width:min(38rem,100vw - 2rem);color:var(--color-text);margin:auto;padding:0}.search-overlay::backdrop{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#070a13b3}.search-overlay__inner{padding:var(--space-6)}.search-overlay__row{gap:var(--space-3);display:flex}.search-overlay input[type=search]{font:inherit;color:var(--color-text);background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-2) var(--space-3);flex:1;min-height:44px}.search-overlay__note{font-size:var(--text-sm);color:var(--color-text-muted);margin-top:var(--space-4)}.search-overlay__categories{gap:var(--space-2);margin:0 0 var(--space-4);flex-wrap:wrap;padding:0;list-style:none;display:flex}.search-overlay__categories li{border:1px solid var(--color-border);border-radius:var(--radius-full);padding:0 var(--space-3);font-size:var(--text-sm);color:var(--color-text-muted)}.bg-stars{background-repeat:repeat;position:absolute;inset:0}.bg-stars--faint{opacity:.8;background-image:radial-gradient(1px 1px at 14% 18%,#cdddf5cc 50%,#0000 51%),radial-gradient(1px 1px at 42% 56%,#aab2c8b3 50%,#0000 51%),radial-gradient(1.5px 1.5px at 71% 34%,#e8eaf2cc 50%,#0000 51%),radial-gradient(1px 1px at 88% 74%,#cdddf599 50%,#0000 51%);background-size:640px 520px}.bg-stars--dense{background-image:radial-gradient(1px 1px at 8% 12%,#cdddf5e6 50%,#0000 51%),radial-gradient(1.5px 1.5px at 19% 47%,#ffe9c9d9 50%,#0000 51%),radial-gradient(1px 1px at 27% 81%,#bcd0ffcc 50%,#0000 51%),radial-gradient(2px 2px at 36% 22%,#fffffff2 50%,#0000 51%),radial-gradient(1px 1px at 47% 64%,#cdddf5bf 50%,#0000 51%),radial-gradient(1.5px 1.5px at 58% 9%,#e8eaf2e6 50%,#0000 51%),radial-gradient(1px 1px at 66% 43%,#ffe9c9b3 50%,#0000 51%),radial-gradient(2px 2px at 76% 71%,#ffffffe6 50%,#0000 51%),radial-gradient(1px 1px at 84% 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