:root{color-scheme:light dark;--color-paper: light-dark(#F7F5F0, #171614);--color-tone: light-dark(#EEEBE4, #211F1C);--color-card: light-dark(#FFFFFF, #2A2825);--color-ink: light-dark(#1D1C1A, #F5F3EE);--color-ink-secondary: light-dark(#6B675F, #A8A399);--color-ink-muted: light-dark(#7D786F, #8C877E);--color-ink-decor: light-dark(#B9B4AA, #4A4741);--color-night: #0F0E0D;--color-night-ink: #F5F3EE;--color-night-ink-secondary: #9C978E;--color-frame: light-dark(#E2DED6, #34312D);--color-screen: light-dark(#F2F2F7, #000000);--color-lesson: light-dark(#D9D5CC, #3D3A35);--color-line-callout: light-dark(rgba(29,28,26,.35), rgba(245,243,238,.35));--color-line-divider: light-dark(rgba(29,28,26,.15), rgba(245,243,238,.15));--color-line-grid: light-dark(rgba(29,28,26,.06), rgba(245,243,238,.06));--color-night-line: rgba(245,243,238,.14);--color-night-fill: rgba(245,243,238,.12);--color-paper-fill: light-dark(rgba(29,28,26,.06), rgba(245,243,238,.06));--color-material: light-dark(rgba(247,245,240,.72), rgba(23,22,20,.72));--color-material-night: rgba(23,22,20,.72);--color-material-line: light-dark(rgba(29,28,26,.08), rgba(245,243,238,.08));--color-menu-panel: rgba(30,29,27,.82);--color-scrim: rgba(15,14,13,.72);--font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--fw-regular: 400;--fw-semibold: 600;--fw-display: var(--fw-semibold);--fw-block: var(--fw-semibold);--fw-title: var(--fw-semibold);--fw-heading: var(--fw-semibold);--fw-question: var(--fw-semibold);--fs-display: clamp(2.75rem, 2.0344rem + 3.0534vw, 3.5rem);--lh-display: clamp(3rem, 2.2844rem + 3.0534vw, 3.75rem);--fs-block: clamp(2.25rem, 1.5344rem + 3.0534vw, 3rem);--lh-block: clamp(2.5rem, 1.7844rem + 3.0534vw, 3.25rem);--fs-title: clamp(2.125rem, 1.7672rem + 1.5267vw, 2.5rem);--lh-title: clamp(2.5rem, 2.1422rem + 1.5267vw, 2.875rem);--fs-lead: clamp(1.25rem, 1.1307rem + .5089vw, 1.375rem);--lh-lead: clamp(1.75rem, 1.6307rem + .5089vw, 1.875rem);--fs-heading: clamp(1.25rem, 1.1307rem + .5089vw, 1.375rem);--lh-heading: clamp(1.75rem, 1.6307rem + .5089vw, 1.875rem);--fs-question: clamp(1.0625rem, .9432rem + .5089vw, 1.1875rem);--lh-question: clamp(1.5rem, 1.3807rem + .5089vw, 1.625rem);--fs-body: clamp(1.0625rem, 1.0029rem + .2545vw, 1.125rem);--lh-body: clamp(1.5rem, 1.3807rem + .5089vw, 1.625rem);--fs-small: clamp(.9375rem, .8779rem + .2545vw, 1rem);--lh-small: clamp(1.25rem, 1.1307rem + .5089vw, 1.375rem);--fs-caption: clamp(.8125rem, .7529rem + .2545vw, .875rem);--lh-caption: clamp(1rem, .8807rem + .5089vw, 1.125rem);--fs-section: clamp(1.5rem, 1.2615rem + 1.0178vw, 1.75rem);--lh-section: clamp(2rem, 1.7615rem + 1.0178vw, 2.25rem);--lh-reading: clamp(1.625rem, 1.5057rem + .5089vw, 1.75rem);--ls-display: -.034em;--ls-block: -.03em;--ls-title: -.03em;--ls-lead: 0;--ls-heading: -.02em;--ls-question: -.01em;--ls-body: -.01em;--ls-small: 0;--ls-caption: 0;--ls-section: -.025em;--ls-reading: -.01em;--space-4: 4px;--space-8: 8px;--space-12: 12px;--space-16: 16px;--space-20: 20px;--space-24: 24px;--space-28: 28px;--space-32: 32px;--space-40: 40px;--space-48: 48px;--space-64: 64px;--space-96: 96px;--space-128: 128px;--space-160: 160px;--space-block: clamp(96px, 65.4656px + 8.1425vw, 128px);--space-title: clamp(32px, 24.3664px + 2.0356vw, 40px);--tile-pad: clamp(20px, 16.1832px + 1.0178vw, 24px);--tile-gap: clamp(8px, 4.1832px + 1.0178vw, 12px);--space-para: clamp(16px, 8.3664px + 2.0356vw, 24px);--space-section: clamp(56px, 48.3664px + 2.0356vw, 64px);--space-figure: clamp(24px, 16.3664px + 2.0356vw, 32px);--radius-8: 8px;--radius-12: 12px;--radius-16: 16px;--radius-24: 24px;--radius-pill: 999px;--size-touch: 44px;--size-header: 56px;--size-content: 1040px;--size-stroke-field: 1.5px;--size-reading: 680px;--measure: 44rem;--grid-cols: 4;--gutter: var(--space-16);--margin: var(--space-16);--ease-spring: linear(0, .06, .186, .329, .466, .584, .682, .76, .821, .868, .903, .929, .949, .963, .973, .981, .986, .99, .993, .995, .997, .998, .998, .999, 1);--ease-fade: ease;--ease-out-cubic: cubic-bezier(.33, 1, .68, 1);--dur-spring: .6s;--dur-exit: .3s;--dur-fade: .2s;--dur-press: .1s;--stagger: 45ms;--scale-press-card: .97;--scale-press-icon: .88;--reveal-rise: 80px;--reveal-dim: .16;--reveal-slide: 30%;--reveal-step: 4%;--swap-rise: 48px;--swap-dim: .3;--swap-dist: clamp(480px, 122.6415vw - 255.8491px, 1000px);--hero-dim: .6;--hero-sink: .5;--hero-fade-end: 560px;--appear-rise: 20px;--appear-stagger: 90ms;--dur-glide-min: .52s;--dur-glide-max: 1s;--dur-shine-delay: 1.5s;--dur-shine: 1.4s;--dur-shine-every: 5s;--blur-material: blur(20px) saturate(180%);--blur-menu: blur(24px) saturate(160%)}:root[data-theme=light]{color-scheme:light}:root[data-theme=dark]{color-scheme:dark}@media (min-width: 600px){:root{--grid-cols: 8;--gutter: var(--space-24);--margin: var(--space-32);--ls-display: -.035em;--ls-block: -.035em;--ls-question: 0;--ls-body: 0;--ls-reading: 0}}@media (min-width: 768px){:root{--fs-display: clamp(3.5rem, 2rem + 3.125vw, 4.5rem);--lh-display: clamp(3.75rem, 2.25rem + 3.125vw, 4.75rem);--fs-block: clamp(3rem, 2.25rem + 1.5625vw, 3.5rem);--lh-block: clamp(3.25rem, 2.5rem + 1.5625vw, 3.75rem);--fs-title: clamp(2.5rem, 1.75rem + 1.5625vw, 3rem);--lh-title: clamp(2.875rem, 1.9375rem + 1.9531vw, 3.5rem);--fs-lead: clamp(1.375rem, 1.1875rem + .3906vw, 1.5rem);--lh-lead: clamp(1.875rem, 1.6875rem + .3906vw, 2rem);--fs-heading: clamp(1.375rem, 1.1875rem + .3906vw, 1.5rem);--lh-heading: clamp(1.875rem, 1.6875rem + .3906vw, 2rem);--fs-question: clamp(1.1875rem, 1rem + .3906vw, 1.3125rem);--lh-question: clamp(1.625rem, 1.4375rem + .3906vw, 1.75rem);--fs-body: clamp(1.125rem, 1.0312rem + .1953vw, 1.1875rem);--lh-body: clamp(1.625rem, 1.4375rem + .3906vw, 1.75rem);--fs-small: clamp(1rem, .9062rem + .1953vw, 1.0625rem);--lh-small: clamp(1.375rem, 1.1875rem + .3906vw, 1.5rem);--fs-caption: clamp(.875rem, .7812rem + .1953vw, .9375rem);--lh-caption: clamp(1.125rem, .9375rem + .3906vw, 1.25rem);--fs-section: clamp(1.75rem, 1.375rem + .7813vw, 2rem);--lh-section: clamp(2.25rem, 1.875rem + .7813vw, 2.5rem);--lh-reading: clamp(1.75rem, 1.5625rem + .3906vw, 1.875rem);--space-block: clamp(128px, 80px + 6.25vw, 160px);--space-title: clamp(40px, 28px + 1.5625vw, 48px);--tile-pad: clamp(24px, 18px + .7812vw, 28px);--tile-gap: clamp(12px, 6px + .7812vw, 16px);--space-section: clamp(64px, 52px + 1.5625vw, 72px)}}@media (min-width: 1024px){:root{--grid-cols: 12;--margin: var(--space-64);--size-header: 72px;--hero-fade-end: 640px;--ls-display: -.04em;--ls-title: -.035em}}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;background:var(--color-night)}body:not(:has(.hero)):before{content:"";position:absolute;inset-inline:0;bottom:100%;height:100vh;background:var(--color-paper)}body{margin:0;min-height:100dvh;display:flex;flex-direction:column;background:var(--color-paper);color:var(--color-ink);font-family:var(--font-sans);font-size:var(--fs-body);line-height:var(--lh-body);letter-spacing:var(--ls-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:clip;transition:background var(--dur-fade) var(--ease-fade),color var(--dur-fade) var(--ease-fade)}.container{width:100%;--container-pad: var(--margin);padding-inline:var(--container-pad)}@media (min-width: 1440px){.container{--container-pad: calc((100% - var(--size-content)) / 2)}}.grid{display:grid;grid-template-columns:repeat(var(--grid-cols),minmax(0,1fr));gap:var(--gutter)}main{flex:1 1 auto;display:flex;flex-direction:column;overflow-x:clip}main [id]{scroll-margin-top:var(--size-header)}main [id][tabindex="-1"]:focus{outline:none}.wrap-main{display:flex;flex-direction:column;flex:1 1 auto}a{color:var(--color-ink);text-decoration:underline;text-underline-offset:.2em;text-decoration-color:var(--color-line-callout);transition:text-decoration-color var(--dur-fade) var(--ease-fade),color var(--dur-fade) var(--ease-fade)}a:hover{text-decoration-color:var(--color-ink)}h1,h2,h3{text-wrap:pretty}.hero h1,.block-title span,.art-title span,.art-sec h2{text-wrap:balance}:focus-visible{outline:2px solid var(--color-ink);outline-offset:3px;border-radius:var(--radius-8)}hr{border:none;border-top:1px solid var(--color-line-divider);margin:var(--space-32) 0}.app-icon{display:block;width:28px;height:28px;border-radius:25%}.app-icon-lg{width:72px;height:72px;border-radius:22.5%}@media (min-width: 600px){.app-icon{width:30px;height:30px}.app-icon-lg{width:80px;height:80px}}@media (min-width: 1024px){.app-icon{width:32px;height:32px}.app-icon-lg{width:88px;height:88px}}.hdr{position:sticky;top:0;z-index:10;background:var(--color-material);-webkit-backdrop-filter:var(--blur-material);backdrop-filter:var(--blur-material);box-shadow:0 1px 0 var(--color-material-line);transition:background-color var(--dur-fade) var(--ease-fade),box-shadow var(--dur-fade) var(--ease-fade),color var(--dur-fade) var(--ease-fade),transform var(--dur-spring) var(--ease-spring)}.hdr[data-hidden]{transform:translateY(calc(-100% - 1px));transition-duration:var(--dur-fade),var(--dur-fade),var(--dur-fade),var(--dur-exit)}.hdr[data-over]{background:transparent;box-shadow:none;color:var(--color-night-ink);-webkit-backdrop-filter:none;backdrop-filter:none}.hdr[data-over][data-scrolled]{background:var(--color-material-night);box-shadow:0 1px 0 var(--color-night-line);-webkit-backdrop-filter:var(--blur-material);backdrop-filter:var(--blur-material)}.hdr[data-over] :focus-visible{outline-color:var(--color-night-ink)}.hdr[data-over] .hdr-nav a,.hdr[data-over] .ctl-paper{color:var(--color-night-ink-secondary)}.hdr[data-over] .hdr-nav a:hover,.hdr[data-over] .ctl-paper:hover{color:var(--color-night-ink)}.hdr[data-over] .lang[open]>.ctl-paper{background:var(--color-night-fill);color:var(--color-night-ink)}.hdr[data-over] .lang-paper .lang-list{background:var(--color-menu-panel);color:var(--color-night-ink);-webkit-backdrop-filter:var(--blur-menu);backdrop-filter:var(--blur-menu);box-shadow:inset 0 0 0 1px var(--color-night-line)}.hdr[data-over] .lang-paper .lang-list a[aria-current]{background:var(--color-night-fill)}.hdr[data-over] .dl-sm{background:var(--color-night-ink);color:var(--color-night)}.hdr-bar{height:var(--size-header);display:flex;align-items:center;gap:var(--space-64)}.brand{display:flex;align-items:center;gap:var(--space-8);color:inherit;text-decoration:none;font-size:var(--fs-body);line-height:var(--lh-body);font-weight:var(--fw-semibold);letter-spacing:var(--ls-heading)}.hdr-nav{display:none;gap:var(--space-32);font-size:var(--fs-caption);line-height:var(--lh-caption)}.hdr-nav a{color:var(--color-ink-secondary);text-decoration:none;transition:color var(--dur-fade) var(--ease-fade)}.hdr-nav a:hover{color:var(--color-ink)}.hdr-tools{display:none;margin-left:auto;align-items:center;gap:var(--space-8)}.hdr-cta{transition:opacity var(--dur-spring) var(--ease-fade),transform var(--dur-spring) var(--ease-spring),filter var(--dur-exit) var(--ease-fade),visibility 0s}.hdr-cta[data-hidden]{opacity:0;visibility:hidden;transform:scale(.9);filter:blur(4px);transition:opacity var(--dur-exit) var(--ease-fade),transform var(--dur-exit) var(--ease-spring),filter var(--dur-exit) var(--ease-fade),visibility 0s var(--dur-exit)}.burger{position:relative;flex:none;width:var(--size-touch);height:var(--size-touch);margin-left:auto;margin-right:-10px;padding:0;border:0;border-radius:var(--radius-pill);background:none;color:inherit;cursor:pointer;transition:transform var(--dur-press) var(--ease-fade)}.burger:active{transform:scale(var(--scale-press-icon))}.burger span{position:absolute;left:13px;top:18px;width:18px;height:2px;border-radius:1px;background:currentColor}.burger span+span{top:24px}@media (min-width: 1024px){.hdr-nav,.hdr-tools{display:flex}.burger{display:none}}.menu{inset:0 0 auto;width:100%;max-width:none;height:auto;margin:0;padding:0 0 var(--space-24);border:0;overflow:visible;color:var(--color-night-ink);background:var(--color-menu-panel);-webkit-backdrop-filter:var(--blur-menu);backdrop-filter:var(--blur-menu);border-radius:0 0 var(--radius-24) var(--radius-24);clip-path:inset(0 0 100% 0);transition:clip-path var(--dur-exit) var(--ease-spring),display var(--dur-exit) allow-discrete,overlay var(--dur-exit) allow-discrete}.menu:popover-open{clip-path:inset(0 0 0 0 round 0 0 var(--radius-24) var(--radius-24));transition-duration:var(--dur-spring)}@starting-style{.menu:popover-open{clip-path:inset(0 0 100% 0)}}:root:has(.hdr[data-over]) .menu:not(:popover-open){clip-path:inset(0 0 calc(100% - var(--size-header)) 0)}@starting-style{:root:has(.hdr[data-over]) .menu:popover-open{clip-path:inset(0 0 calc(100% - var(--size-header)) 0)}}.menu::backdrop{background:var(--color-scrim);opacity:0;transition:opacity var(--dur-exit) var(--ease-fade),display var(--dur-exit) allow-discrete,overlay var(--dur-exit) allow-discrete}.menu:popover-open::backdrop{opacity:1}@starting-style{.menu:popover-open::backdrop{opacity:0}}.menu:popover-open[data-closing]{clip-path:inset(0 0 100% 0);transition-duration:var(--dur-exit)}:root:has(.hdr[data-over]) .menu:popover-open[data-closing]{clip-path:inset(0 0 calc(100% - var(--size-header)) 0)}.menu:popover-open[data-closing]::backdrop{opacity:0}.burger-close span{top:21px;transform:rotate(45deg)}.burger-close span+span{top:21px;transform:rotate(-45deg)}.menu:popover-open .burger-close span{transition:top var(--dur-fade) var(--ease-fade),transform var(--dur-spring) var(--ease-spring) var(--dur-press)}@starting-style{.menu:popover-open .burger-close span{top:18px;transform:none}.menu:popover-open .burger-close span+span{top:24px;transform:none}}.menu:popover-open[data-closing] .burger-close span{top:18px;transform:none;transition:transform var(--dur-exit) var(--ease-spring),top var(--dur-fade) var(--ease-fade) var(--dur-press)}.menu:popover-open[data-closing] .burger-close span+span{top:24px}.menu-nav{margin-top:var(--space-8);border-top:1px solid var(--color-night-line);display:flex;flex-direction:column}.menu-nav a{padding:var(--space-16) 0;border-bottom:1px solid var(--color-night-line);color:inherit;text-decoration:none;font-size:var(--fs-heading);line-height:var(--lh-heading);font-weight:var(--fw-heading);letter-spacing:var(--ls-heading)}.menu-foot{margin-top:var(--space-24);display:flex;align-items:center;justify-content:space-between}.menu-nav a,.menu-foot{opacity:0;transform:translateY(-12px);filter:blur(4px);transition:opacity var(--dur-press) var(--ease-fade),transform var(--dur-exit) var(--ease-spring),filter var(--dur-press) var(--ease-fade)}.menu:popover-open .menu-nav a,.menu:popover-open .menu-foot{opacity:1;transform:none;filter:none;transition:opacity var(--dur-spring) var(--ease-fade),transform var(--dur-spring) var(--ease-spring),filter var(--dur-exit) var(--ease-fade);transition-delay:calc(var(--dur-press) + var(--stagger) * var(--i, 0))}.menu:popover-open .menu-nav a:nth-child(2){--i: 1}.menu:popover-open .menu-nav a:nth-child(3){--i: 2}.menu:popover-open .menu-nav a:nth-child(4){--i: 3}.menu:popover-open .menu-foot{--i: 4}@starting-style{.menu:popover-open .menu-nav a,.menu:popover-open .menu-foot{opacity:0;transform:translateY(-12px);filter:blur(4px)}}.menu:popover-open[data-closing] .menu-nav a,.menu:popover-open[data-closing] .menu-foot{opacity:0;transform:translateY(-12px);filter:blur(4px);transition:opacity var(--dur-press) var(--ease-fade),transform var(--dur-exit) var(--ease-spring),filter var(--dur-press) var(--ease-fade)}.menu :focus-visible{outline-color:var(--color-night-ink)}@media (min-width: 1024px){.menu{display:none}}.ctl{position:relative;flex:none;width:var(--size-touch);height:32px;display:inline-grid;place-items:center;padding:0;border:0;border-radius:var(--radius-16);background:none;cursor:pointer;list-style:none;transition:color var(--dur-fade) var(--ease-fade),background-color var(--dur-fade) var(--ease-fade),transform var(--dur-press) var(--ease-fade)}.ctl:after{content:"";position:absolute;inset:-6px 0}.ctl::-webkit-details-marker{display:none}.ctl:active{transform:scale(var(--scale-press-icon))}.ctl svg{grid-area:1 / 1;width:18px;height:18px}.ctl-paper{color:var(--color-ink-secondary)}.ctl-paper:hover{color:var(--color-ink)}.ctl-night{color:var(--color-night-ink-secondary)}.ctl-night:hover{color:var(--color-night-ink)}.ctl .i-moon{color:light-dark(currentColor,transparent)}.ctl .i-sun{color:light-dark(transparent,currentColor)}.ctl-row{display:flex;align-items:center;gap:var(--space-4)}.lang{position:relative}.lang[open]>.ctl-paper{background:var(--color-paper-fill);color:var(--color-ink)}.lang[open]>.ctl-night{background:var(--color-night-fill);color:var(--color-night-ink)}.lang-list{position:absolute;z-index:3;top:calc(100% + var(--space-8));right:0;width:200px;padding:6px;border-radius:var(--radius-16);display:flex;flex-direction:column;transform-origin:calc(100% - 22px) 0}.lang-up .lang-list{top:auto;bottom:calc(100% + var(--space-8));right:auto;left:0;transform-origin:22px 100%}.lang[open] .lang-list{transition:opacity var(--dur-fade) var(--ease-fade),transform var(--dur-spring) var(--ease-spring)}@starting-style{.lang[open] .lang-list{opacity:0;transform:scale(.96)}}.lang[data-opening] .lang-list{opacity:0;transform:scale(.96);transition:none}.lang[open][data-closing] .lang-list{opacity:0;transform:scale(.96);transition:opacity var(--dur-fade) var(--ease-fade),transform var(--dur-exit) var(--ease-spring)}.lang-paper .lang-list{background:var(--color-card);box-shadow:inset 0 0 0 1px var(--color-material-line);color:var(--color-ink)}.lang-night .lang-list{background:var(--color-menu-panel);color:var(--color-night-ink);-webkit-backdrop-filter:var(--blur-menu);backdrop-filter:var(--blur-menu);box-shadow:inset 0 0 0 1px var(--color-night-line)}.lang-list a{display:flex;align-items:center;justify-content:space-between;gap:var(--space-16);height:var(--size-touch);padding:0 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