:root{color-scheme:light dark;--bg: #f4f5f7;--surface: #ffffff;--surface-2: #eaecf0;--ink: #15171c;--ink-2: #363c46;--muted: #5b6270;--line: #dcdfe5;--line-2: #b6bcc6;--signal: #8a5a00;--signal-soft: #e6c274;--ring: #8a5a00;--vf-bg: #0e1013;--vf-bg-2: #16191f;--vf-fg: #f5f6f8;--vf-muted: #99a1af;--vf-line: rgba(245, 246, 248, .14);--vf-line-2: rgba(245, 246, 248, .34);--vf-signal: #ffd60a;--wrap: 1120px;--wrap-narrow: 940px;--measure: 68ch;--radius: 14px;--radius-s: 8px;--sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, "Helvetica Neue", "PingFang SC", Arial, sans-serif;--mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;--head-h: 64px}@media(prefers-color-scheme:dark){:root{--bg: #0d0f12;--surface: #14171c;--surface-2: #1b1f25;--ink: #eef0f3;--ink-2: #c3c9d2;--muted: #949cab;--line: #272b33;--line-2: #3c424c;--signal: #ffd60a;--signal-soft: #6b5300;--ring: #ffd60a;--vf-bg: #08090c;--vf-bg-2: #101319}}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.65;overflow-x:clip;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}::selection{background:var(--signal-soft);color:var(--ink)}a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--muted);text-decoration-thickness:1px;text-underline-offset:3px;overflow-wrap:break-word;transition:text-decoration-color .14s ease,color .14s ease}a:hover{color:var(--ink);text-decoration-color:var(--signal);text-decoration-thickness:2px}a:focus-visible,.btn:focus-visible,summary:focus-visible{outline:2px solid var(--ring);outline-offset:3px;border-radius:2px}p,ul,ol,dl{margin:0 0 18px}[id]{scroll-margin-top:calc(var(--head-h) + 28px)}h1,h2,h3{text-wrap:balance;font-weight:600}p{text-wrap:pretty}h1{font-size:clamp(2rem,4.4vw,2.75rem);line-height:1.14;letter-spacing:-.021em;margin:0 0 14px}h2{font-size:clamp(1.28rem,2.1vw,1.55rem);line-height:1.28;letter-spacing:-.012em;margin:0 0 14px}h3{font-size:1.06rem;line-height:1.4;letter-spacing:-.005em;margin:0 0 8px}.lead{font-size:clamp(1.13rem,1.55vw,1.3rem);line-height:1.55;color:var(--ink-2);max-width:58ch;margin:0 0 32px}.meta{font-family:var(--mono);font-size:.8rem;line-height:1.6;letter-spacing:.015em;color:var(--muted);margin:0}.spec{font-family:var(--mono);font-size:.92em;letter-spacing:.005em}.mark{font-weight:600;color:var(--ink);text-decoration:underline;text-decoration-color:var(--signal);text-decoration-thickness:2px;text-underline-offset:4px}code{font-family:var(--mono);background:var(--surface-2);padding:2px 6px;border-radius:4px;font-size:.85em}.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}.wrap--narrow{max-width:var(--wrap-narrow)}main{display:block;padding-bottom:clamp(56px,7vw,88px)}.section{margin:clamp(48px,7vw,80px) 0 0}.measure{max-width:var(--measure)}.ticks{height:9px;border-bottom:1px solid var(--line);background-image:repeating-linear-gradient(to right,var(--line-2) 0 1px,transparent 1px 14px);background-repeat:repeat-x;background-position:0 100%;background-size:100% 5px}.site-header{border-bottom:1px solid var(--line);background:var(--bg)}.header-inner{display:flex;flex-wrap:wrap;align-items:center;gap:4px 28px;padding-top:14px;padding-bottom:14px}.brand{display:inline-flex;align-items:center;gap:10px;margin-right:auto;font-weight:600;letter-spacing:-.01em;text-decoration:none;color:var(--ink);padding:6px 0}.brand-mark{display:block;width:22px;height:22px;flex:none;color:var(--ink)}.brand-mark .dot{fill:var(--signal)}.brand:hover .brand-mark{color:var(--signal)}.nav{display:flex;flex-wrap:wrap;align-items:center;gap:2px 22px;font-size:.925rem}.nav a{position:relative;color:var(--muted);text-decoration:none;padding:11px 0;display:inline-block}.nav a:hover{color:var(--ink)}.nav a[aria-current=page]{color:var(--ink);font-weight:550}.nav a[aria-current=page]:after{content:"";position:absolute;left:0;right:0;bottom:4px;height:2px;background:var(--signal)}@media(min-width:768px){.site-header{position:sticky;top:0;z-index:10}}.lang-bar{border-bottom:1px solid var(--line);background:var(--surface-2);font-size:.8125rem}.lang-bar nav{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:0 20px}.lang-bar a{color:var(--muted);text-decoration:none;padding:7px 0}.lang-bar a:hover{color:var(--ink);text-decoration:underline}.lang-bar a[aria-current=true]{color:var(--ink);font-weight:600}@media(max-width:767px){.lang-bar a{padding:12px 0}}.hero{padding-top:clamp(28px,4vw,48px)}.vf{position:relative;overflow:hidden;isolation:isolate;border-radius:var(--radius);background:radial-gradient(120% 90% at 50% 8%,var(--vf-bg-2) 0%,var(--vf-bg) 68%),var(--vf-bg);min-height:clamp(300px,46vw,470px);display:flex;align-items:flex-end;padding:clamp(24px,4vw,52px)}@media(prefers-color-scheme:dark){.vf{box-shadow:0 0 0 1px var(--line-2)}}@media(min-width:900px){.vf{aspect-ratio:16 / 9;min-height:0}}.vf-ground{position:absolute;left:-80%;right:-80%;bottom:-4%;height:74%;z-index:-1;transform:perspective(1150px) rotateX(64deg);transform-origin:50% 100%;background-image:repeating-linear-gradient(to right,rgba(245,246,248,.26) 0 1px,transparent 1px 44px),repeating-linear-gradient(to bottom,rgba(245,246,248,.26) 0 1px,transparent 1px 44px);-webkit-mask-image:linear-gradient(to top,#000 0%,transparent 82%);mask-image:linear-gradient(to top,#000 0%,transparent 82%)}.vf-grid{position:absolute;top:0;right:0;bottom:0;left:0;z-index:-1;background-image:repeating-linear-gradient(to right,transparent 0 calc(33.3333% - 1px),var(--vf-line) calc(33.3333% - 1px) 33.3333%),repeating-linear-gradient(to bottom,transparent 0 calc(33.3333% - 1px),var(--vf-line) calc(33.3333% - 1px) 33.3333%)}.vf-c{position:absolute;width:26px;height:26px;border:2px solid var(--vf-line-2)}.vf-tl{top:16px;left:16px;border-right:0;border-bottom:0;border-top-left-radius:5px}.vf-tr{top:16px;right:16px;border-left:0;border-bottom:0;border-top-right-radius:5px}.vf-bl{bottom:16px;left:16px;border-right:0;border-top:0;border-bottom-left-radius:5px}.vf-br{bottom:16px;right:16px;border-left:0;border-top:0;border-bottom-right-radius:5px}.vf-reticle{position:absolute;top:33.3333%;left:66.6666%;width:46px;height:46px;margin:-23px 0 0 -23px;border:1px solid var(--vf-signal);border-radius:3px}.vf-reticle:before,.vf-reticle:after{content:"";position:absolute;background:var(--vf-signal)}.vf-reticle:before{left:50%;top:50%;width:11px;height:1px;margin:0 0 0 -5.5px}.vf-reticle:after{left:50%;top:50%;width:1px;height:11px;margin:-5.5px 0 0}.vf-body{position:relative;width:100%}.hero h1{color:var(--vf-fg);font-size:clamp(2rem,6.6vw,3.9rem);line-height:1.08;letter-spacing:-.028em;margin:0;max-width:20ch}@media(max-width:599px){.vf-reticle{top:26%;left:74%;width:34px;height:34px;margin:-17px 0 0 -17px}.hero h1{max-width:14ch}}.intro{margin-top:clamp(32px,4.5vw,52px)}.intro .lead{font-size:clamp(1.18rem,1.75vw,1.44rem);color:var(--ink);max-width:52ch;margin:0}.note{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(20px,2.6vw,28px);max-width:var(--measure);margin:clamp(32px,4.5vw,48px) 0 0}.note:before,.note:after{content:"";position:absolute;width:22px;height:22px;border:2px solid var(--signal);pointer-events:none}.note:before{top:-1px;left:-1px;border-right:0;border-bottom:0;border-top-left-radius:var(--radius)}.note:after{bottom:-1px;right:-1px;border-left:0;border-top:0;border-bottom-right-radius:var(--radius)}.note>:last-child{margin-bottom:0}.note strong{font-weight:650}.note--key{font-size:1.06rem;line-height:1.6}.band{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(24px,3.4vw,36px)}.band>:last-child{margin-bottom:0}.band p{max-width:58ch;color:var(--ink-2)}.features{list-style:none;padding:0;margin:0;display:grid;gap:32px 48px}@media(min-width:720px){.features{grid-template-columns:1fr 1fr}}.features>li{position:relative;border-top:1px solid var(--line-2);padding-top:22px;margin:0}.features>li:before{content:"";position:absolute;top:-1px;left:0;width:32px;height:2px;background:var(--signal)}.features h3{margin:0 0 8px}.features p{margin:0;color:var(--muted);max-width:44ch}.btn{display:inline-block;background:var(--ink);color:var(--bg);text-decoration:none;padding:14px 30px;border-radius:999px;font-weight:600;font-size:1rem;line-height:1.25;min-height:48px;transition:background-color .14s ease,transform .14s ease}.btn:hover{background:#000;color:#fff;transform:translateY(-1px)}.btn:active{transform:translateY(0)}@media(prefers-color-scheme:dark){.btn:hover{background:#fff;color:#000}}.page-head{padding-top:clamp(36px,5vw,60px);padding-bottom:clamp(20px,2.6vw,28px)}.page-head h1{max-width:20ch}.page-head .ticks{margin-top:clamp(20px,2.6vw,28px)}.doc-layout{padding-top:clamp(28px,4vw,44px)}.doc-intro,.doc{max-width:var(--measure)}.doc h2{position:relative;margin:clamp(40px,5vw,58px) 0 14px;padding-top:clamp(20px,2.6vw,26px);border-top:1px solid var(--line)}.doc h2:first-of-type{margin-top:clamp(36px,4.5vw,48px)}.sec-n{font-family:var(--mono);font-weight:500;font-size:.82em;color:var(--signal);letter-spacing:.01em}@media(min-width:620px){.doc h2:target:after{content:"";position:absolute;left:-18px;top:calc(clamp(20px,2.6vw,26px) + .62em);width:6px;height:6px;background:var(--signal)}}.doc h3{margin:30px 0 8px;color:var(--ink)}.doc p,.doc li{color:var(--ink-2)}.doc ul{list-style:none;padding:0;margin:0 0 18px}.doc ul>li{position:relative;padding-left:26px;margin-bottom:12px}.doc ul>li:before{content:"";position:absolute;left:2px;top:.66em;width:7px;height:7px;border:1px solid var(--line-2);background:var(--surface)}.doc ul>li:after{content:"";position:absolute;left:4px;top:calc(.66em + 2px);width:3px;height:3px;background:var(--signal)}.doc strong{color:var(--ink);font-weight:650}.doc .note{margin:0 0 clamp(28px,3.6vw,40px)}.doc-intro>.note{margin-bottom:clamp(28px,3.6vw,40px)}.doc-intro>.note:first-child{margin-top:0}.toc{margin:0 0 clamp(36px,4.5vw,48px);padding:20px 22px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}.toc ol{list-style:none;margin:0;padding:0;font-size:.875rem;line-height:1.45}.toc li{margin:0;break-inside:avoid}.toc a{display:grid;grid-template-columns:2.2em minmax(0,1fr);padding:7px 0;color:var(--muted);text-decoration:none}.toc a:hover{color:var(--ink)}.toc-n{font-family:var(--mono);color:var(--signal)}@media(min-width:480px)and (max-width:1023px){.toc ol{column-count:2;column-gap:32px}}@media(min-width:1024px){.doc-layout{display:grid;grid-template-columns:220px minmax(0,var(--measure));column-gap:64px;align-items:start;justify-content:center}.doc-intro{grid-column:2;grid-row:1}.toc{grid-column:1;grid-row:1 / span 2;align-self:start;position:sticky;top:calc(var(--head-h) + 24px);max-height:calc(100vh - var(--head-h) - 48px);overflow:auto;margin:0;padding:4px 0 4px 18px;background:none;border:0;border-left:1px solid var(--line);border-radius:0}.doc{grid-column:2;grid-row:2}}dl.contact{display:grid;grid-template-columns:9rem minmax(0,1fr);border-top:1px solid var(--line);margin:0 0 24px}dl.contact dt{font-family:var(--mono);font-size:.82rem;line-height:1.6;letter-spacing:.015em;color:var(--muted);padding:15px 16px 15px 0;border-bottom:1px solid var(--line)}dl.contact dd{margin:0;padding:14px 0;color:var(--ink-2);border-bottom:1px solid var(--line);overflow-wrap:break-word}@media(max-width:559px){dl.contact{grid-template-columns:minmax(0,1fr)}dl.contact dt{padding:14px 0 0;border-bottom:0}dl.contact dd{padding:2px 0 14px}}.reqs{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}.reqs>li{position:relative;margin:0;padding:14px 0 14px 26px;color:var(--ink-2);border-bottom:1px solid var(--line)}.reqs>li:before{content:"";position:absolute;left:0;top:1.42em;width:12px;height:2px;background:var(--signal)}.qa{border-top:1px solid var(--line);padding:26px 0}.qa>:last-child>:last-child{margin-bottom:0}.qa h3{margin:0 0 8px}.qa-a p{color:var(--ink-2);max-width:62ch}.qa-a>:last-child{margin-bottom:0}@media(min-width:900px){.qa{display:grid;grid-template-columns:15rem minmax(0,1fr);column-gap:48px}.qa h3{margin:0}}.site-footer{border-top:1px solid var(--line);color:var(--muted);font-size:.875rem}.footer-inner{display:grid;gap:24px 48px;padding-top:32px;padding-bottom:44px}@media(min-width:720px){.footer-inner{grid-template-columns:1fr auto;align-items:start}}.footer-brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-weight:600;text-decoration:none;margin-bottom:10px}.footer-brand .brand-mark{width:18px;height:18px}.site-footer nav{display:flex;flex-wrap:wrap;gap:6px 22px}.site-footer a{color:var(--muted);text-decoration-color:var(--line-2)}.site-footer a:hover{color:var(--ink);text-decoration-color:var(--signal)}.site-footer p{margin:0 0 4px;max-width:44ch}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}a,.btn{transition:none}.btn:hover{transform:none}}@media print{:root{--bg: #ffffff;--surface: #ffffff;--ink: #000000;--ink-2: #1a1a1a;--muted: #444444;--line: #bbbbbb;--line-2: #888888;--signal: #000000}body{background:#fff;color:#000;font-size:11pt}.site-header,.site-footer nav,.toc,.ticks,.vf-ground,.vf-grid,.vf-reticle,.vf-c{display:none}.vf{background:none;min-height:0;padding:0}.hero h1{color:#000}.note,.band{border:1px solid #888888}.doc h2,.qa{break-inside:avoid;break-after:avoid}a{text-decoration:none}}.doc--wide{max-width:none}.doc--wide>p,.doc--wide>.lead,.doc--wide>dl,.doc--wide>.note{max-width:var(--measure)}.doc ul.reqs{border-top:1px solid var(--line)}.doc ul.reqs>li:after{content:none}.doc ul.reqs>li:before{border:0;background:var(--signal);width:12px;height:2px;left:0;top:1.42em}@media(max-width:1023px){.toc a{padding:11px 0}}@media(max-width:767px){.nav a{padding:12px 0}.site-footer nav a{display:inline-flex;align-items:center;min-height:44px}}