/* Visual system: landing-page-design skill (Software Development/SKILL.md), Part B.
   One typeface (Geist, Geist Mono for IDs and dates); Tailwind type scale; spacing tokens 2 4 8 12 16 24 32 40 48 64 80 96;
   Tailwind radii; no gradients on backgrounds; no one-sided borders; no italics; base curve cubic-bezier(0.22,1,0.36,1). */
:root{--bg:#f7f7f5;--surface:#ffffff;--surface-2:#f0f0ed;--fg:#151515;--muted:#5f625f;--rule:#e3e3df;--accent:#1f4fd8;--accent-strong:#173da8;--accent-soft:#e8eefc;--chip:#eef1f8;
--hero-from:#000000;--hero-to:#666666;--glass:rgba(255,255,255,.72);--shadow:0 1px 2px rgba(0,0,0,.04),0 8px 24px rgba(0,0,0,.05);
--font:"Geist",system-ui,-apple-system,"Segoe UI",sans-serif;--mono:"Geist Mono",ui-monospace,Menlo,monospace;--ease:cubic-bezier(.22,1,.36,1)}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#181818;--surface:#1f1f1f;--surface-2:#272727;--fg:#ededed;--muted:#a3a3a3;--rule:#313131;--accent:#86a8ff;--accent-strong:#b3c8ff;--accent-soft:#272727;--chip:#272727;
--hero-from:#ffffff;--hero-to:#9b9b9b;--glass:rgba(24,24,24,.72);--shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.3);color-scheme:dark}}
:root[data-theme=dark]{--bg:#181818;--surface:#1f1f1f;--surface-2:#272727;--fg:#ededed;--muted:#a3a3a3;--rule:#313131;--accent:#86a8ff;--accent-strong:#b3c8ff;--accent-soft:#272727;--chip:#272727;
--hero-from:#ffffff;--hero-to:#9b9b9b;--glass:rgba(24,24,24,.72);--shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.3);color-scheme:dark}
*{box-sizing:border-box}html{scroll-padding-top:96px}html.smooth{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--font);font-size:16px;line-height:24px;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:4px;transition:color 300ms var(--ease)}a:hover{color:var(--accent-strong)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}
.skip{position:absolute;left:16px;top:-48px;z-index:50;background:var(--accent);color:var(--surface);padding:8px 12px;border-radius:8px;font-weight:600;transition:transform 300ms var(--ease)}.skip:focus{transform:translateY(64px)}
.wrap{max-width:1120px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
/* floating navigation */
.bar{position:sticky;top:12px;z-index:30;display:flex;justify-content:center;padding:0 16px;margin-top:12px}
.bar-inner{display:flex;align-items:center;gap:8px;padding:8px;background:var(--glass);backdrop-filter:saturate(1.6) blur(16px);-webkit-backdrop-filter:saturate(1.6) blur(16px);border:1px solid var(--rule);border-radius:9999px;box-shadow:var(--shadow);max-width:100%}
.brand{display:flex;align-items:center;gap:8px;padding:0 12px 0 4px;font-size:14px;line-height:20px;font-weight:600;color:var(--fg);text-decoration:none;white-space:nowrap}.brand .mark{flex:none;display:block}
.links{display:flex;gap:2px}.links a{font-size:14px;line-height:20px;font-weight:500;color:var(--muted);text-decoration:none;padding:8px 12px;border-radius:9999px;transition:background-color 300ms var(--ease),color 300ms var(--ease)}
.links a:hover{color:var(--fg);background:var(--surface-2)}.links a[aria-current=page]{color:var(--fg);background:var(--surface-2)}
.hsearch{display:flex;align-items:center;gap:8px;padding:8px 12px;border-radius:9999px;background:var(--surface-2);color:var(--muted);min-width:0}
.hsearch input{border:0;background:transparent;color:var(--fg);font:inherit;font-size:14px;line-height:20px;width:160px;min-width:0;outline:none}.hsearch:focus-within{box-shadow:0 0 0 2px var(--accent)}
.hsearch kbd{font:500 12px/16px var(--mono);color:var(--muted);border:1px solid var(--rule);border-radius:4px;padding:0 4px}
.menu-btn{display:none;width:40px;height:40px;border:0;border-radius:9999px;background:var(--surface-2);color:var(--fg);cursor:pointer;position:relative;flex:none}
.menu-btn span{position:absolute;left:12px;right:12px;height:2px;background:currentColor;border-radius:2px;transition:transform 500ms var(--ease)}
.menu-btn span:nth-child(1){top:15px}.menu-btn span:nth-child(2){top:23px}
.menu-open .menu-btn span:nth-child(1){transform:translateY(4px) rotate(45deg)}.menu-open .menu-btn span:nth-child(2){transform:translateY(-4px) rotate(-45deg)}
.mpanel{position:fixed;inset:0;z-index:25;background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);padding:96px 24px 48px;opacity:0;pointer-events:none;transition:opacity 300ms var(--ease)}
.menu-open .mpanel{opacity:1;pointer-events:auto}.mpanel nav{display:flex;flex-direction:column;gap:8px}
.mpanel a{font-size:30px;line-height:36px;font-weight:600;color:var(--fg);text-decoration:none;opacity:0;transform:translateY(24px);transition:opacity 500ms var(--ease),transform 500ms var(--ease)}
.menu-open .mpanel a{opacity:1;transform:none}
.mpanel a:nth-child(1){transition-delay:0ms}.mpanel a:nth-child(2){transition-delay:60ms}.mpanel a:nth-child(3){transition-delay:120ms}.mpanel a:nth-child(4){transition-delay:180ms}.mpanel a:nth-child(5){transition-delay:240ms}.mpanel a:nth-child(6){transition-delay:300ms}.mpanel a:nth-child(7){transition-delay:360ms}
@media (max-width:900px){.links,.hsearch kbd{display:none}.menu-btn{display:block}.hsearch input{width:120px}}
@media (max-width:420px){.hsearch{display:none}.bar-inner{width:100%;justify-content:space-between}}
/* type */
main{padding-block:48px 96px}
h1{font-size:36px;line-height:40px;font-weight:600;letter-spacing:-.02em;text-wrap:balance;margin:0 0 24px;max-width:780px}
h2{font-size:24px;line-height:32px;font-weight:600;letter-spacing:-.01em;text-wrap:balance;margin:48px 0 16px}
h3{font-size:18px;line-height:28px;font-weight:600;text-wrap:balance;margin:32px 0 8px}
p,li{max-width:70ch;text-wrap:pretty}p{margin:0 0 16px}.lede{font-size:18px;line-height:28px;color:var(--muted)}.muted{color:var(--muted)}
.eyebrow{font-size:12px;line-height:16px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin:0 0 8px}
@media (max-width:640px){h1{font-size:30px;line-height:36px}h2{font-size:20px;line-height:28px}main{padding-block:32px 64px}}
/* content blocks */
.short{background:var(--accent-soft);border:1px solid var(--rule);border-radius:16px;padding:24px 24px 8px;margin:0 0 24px}.short p{font-size:18px;line-height:28px;color:var(--fg)}.short p.eyebrow{font-size:12px;line-height:16px;color:var(--accent)}
.cites{white-space:normal}.nw{white-space:nowrap}.nw .cite{margin-right:1px;max-width:100%;overflow:hidden;text-overflow:ellipsis;vertical-align:bottom}.cite{display:inline-block;font:500 12px/16px var(--font);text-decoration:none;border-radius:9999px;padding:2px 8px;margin:0 2px;color:var(--accent);background:var(--chip);vertical-align:1px;white-space:nowrap;transition:background-color 300ms var(--ease),color 300ms var(--ease)}
.cite:hover{background:var(--accent);color:var(--surface)}.cite:active{transform:scale(.98)}.cite.missing{color:#b0472f}
blockquote{margin:16px 0;padding:24px;background:var(--surface);border:1px solid var(--rule);border-radius:16px;font-size:18px;line-height:28px;font-weight:500;box-shadow:var(--shadow)}
blockquote .when{display:block;margin-top:8px;font-size:12px;line-height:16px;font-weight:400;color:var(--muted)}
.scroll{overflow-x:auto;border:1px solid var(--rule);border-radius:12px;background:var(--surface)}table{border-collapse:collapse;width:100%;font-size:14px;line-height:20px}
th,td{text-align:left;vertical-align:top;padding:12px 16px;border-bottom:1px solid var(--rule)}tr:last-child td{border-bottom:0}
th{font-size:12px;line-height:16px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;background:var(--surface-2)}td.when{white-space:nowrap;font-family:var(--mono);font-size:12px;line-height:20px;color:var(--muted)}
details{margin:16px 0}summary{cursor:pointer;color:var(--accent);font-weight:600;padding:8px 0}
table.lights td:first-child{width:55%}.sws{display:flex;flex-direction:column;gap:4px}.sw{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap}
.dot{width:16px;height:16px;border-radius:9999px;flex:none;box-shadow:inset 0 0 0 1px rgba(0,0,0,.18)}.dot.txt{outline:1px dashed var(--muted);outline-offset:2px}.dot.unlit{background:transparent;box-shadow:inset 0 0 0 1.5px var(--muted)}
.flash{font-size:12px;line-height:16px;color:var(--muted);background:var(--chip);border-radius:9999px;padding:0 8px}.small{font-size:14px;line-height:20px}
.list{padding-left:24px}.list li{margin:8px 0}.tag{font-size:12px;line-height:16px;color:var(--muted);background:var(--chip);border-radius:9999px;padding:2px 8px;margin-left:8px;white-space:nowrap}
.items{padding-left:24px}.items li{margin:12px 0}.items .date{font-family:var(--mono);font-size:12px;line-height:16px;color:var(--muted);margin-right:8px}
/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;padding:0;margin:0;list-style:none}.cards li{max-width:none;margin:0}
.card{display:flex;flex-direction:column;height:100%;background:var(--surface);border:1px solid var(--rule);border-radius:16px;padding:24px;text-decoration:none;color:var(--fg);box-shadow:var(--shadow);transition:transform 500ms var(--ease),border-color 300ms var(--ease)}
.card:hover{transform:translateY(-4px);border-color:var(--accent);color:var(--fg)}.card:active{transform:scale(.98)}
.card .t{font-size:18px;line-height:28px;font-weight:600}.card .s{font-size:14px;line-height:20px;color:var(--muted);margin-top:4px}
.card .n{align-self:flex-start;margin-top:16px;font-size:12px;line-height:16px;font-weight:600;color:var(--accent);background:var(--chip);border-radius:9999px;padding:2px 8px}
.qcards{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}.qcards .card .t{font-size:16px;line-height:24px}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:8px 16px}.section-head p{margin:0}.more{font-weight:600;text-decoration:none;display:inline-flex;gap:4px;align-items:center}
/* hero */
.hero-mark{display:block;margin:0 0 24px;filter:drop-shadow(0 12px 32px rgba(20,60,200,.25))}
.hero{background:var(--surface);border:1px solid var(--rule);border-radius:24px;padding:64px 48px;box-shadow:var(--shadow);margin-bottom:16px}
.hero h1{font-size:48px;line-height:48px;max-width:680px;background:linear-gradient(90deg,var(--hero-from),var(--hero-to));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lede{max-width:680px}
.bigsearch{display:flex;gap:8px;margin-top:32px;max-width:560px;padding:8px;background:var(--surface-2);border:1px solid var(--rule);border-radius:16px}
.ic{width:1em;height:1em;flex:none;fill:none;stroke:currentColor;stroke-width:16;stroke-linecap:round;stroke-linejoin:round}
.bigsearch .ic{align-self:center;margin-left:8px;font-size:20px;color:var(--muted)}
.bigsearch input{flex:1;min-width:0;font:inherit;font-size:16px;line-height:24px;padding:8px;border:0;background:transparent;color:var(--fg);outline:none}.bigsearch:focus-within{border-color:var(--accent)}
.bigsearch button{font:600 16px/24px var(--font);padding:8px 12px;border:0;border-radius:8px;background:var(--accent);color:var(--surface);cursor:pointer;transition:background-color 300ms var(--ease),transform 300ms var(--ease)}
.bigsearch button:hover{background:var(--accent-strong)}.bigsearch button:active{transform:scale(.98)}
@media (max-width:640px){.hero-mark{width:112px;height:112px;margin-bottom:16px}.hero{padding:32px 24px;border-radius:16px}.hero h1{font-size:30px;line-height:36px}.bigsearch{flex-wrap:wrap}.bigsearch button{width:100%}}
/* tagline reveal */
.tagline{padding-block:80px;}.tagline p{font-size:48px;line-height:48px;font-weight:600;letter-spacing:-.02em;max-width:680px;text-wrap:balance;margin:0}
.tagline .w{color:color-mix(in srgb,var(--fg) 30%,transparent);transition:color 500ms var(--ease)}.tagline .w.on{color:var(--fg)}
@media (max-width:640px){.tagline{padding-block:48px}.tagline p{font-size:36px;line-height:40px}}
/* scroll reveal (home sections) */
.reveal{opacity:0;transform:translateY(32px);transition:opacity 700ms var(--ease),transform 700ms var(--ease)}.reveal.in{opacity:1;transform:none}
/* contents */
.doc{display:grid;grid-template-columns:minmax(0,1fr);gap:16px 48px}.doc-body{min-width:0}
.toc{background:var(--surface);border:1px solid var(--rule);border-radius:16px;padding:16px 24px;margin:0 0 24px}
.toc-head{margin:0 0 8px;font-size:12px;line-height:16px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}.toc ul{margin:0;padding:0;list-style:none}.toc li{margin:4px 0;font-size:14px;line-height:20px}.toc li.sub{padding-left:16px}.toc li.sub a{color:var(--muted)}.toc li.sub a:hover{color:var(--accent)}.toc a{text-decoration:none}.toc a:hover{text-decoration:underline}
@media (min-width:1080px){.doc{grid-template-columns:minmax(0,1fr) 240px}.doc .side{grid-column:2;grid-row:1}.doc .doc-body{grid-column:1;grid-row:1}.doc .toc{position:sticky;top:96px}}
/* sources table controls and update log */
.srcctl{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 16px}.srcctl .lbl{font-size:12px;line-height:16px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-right:4px}.srcctl .lbl+button{margin-left:0}
.srcctl button{font:inherit;font-size:14px;line-height:20px;padding:4px 12px;border-radius:9999px;border:1px solid var(--rule);background:var(--surface);color:var(--fg);cursor:pointer;transition:background-color 300ms var(--ease)}
.srcctl button[aria-pressed=true]{background:var(--accent);border-color:var(--accent);color:var(--bg)}.srcctl .lbl:not(:first-child){margin-left:16px}
.logentry{margin:0 0 24px}.logdate{margin:0;font-family:var(--mono);font-size:14px;line-height:20px;color:var(--muted)}.logtitle{margin:4px 0 8px;font-weight:600}
/* footer */
footer{border-top:1px solid var(--rule);color:var(--muted);font-size:14px;line-height:20px}footer .wrap{padding-block:32px}.foot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px}.foot .made{max-width:420px;text-align:right;margin-left:auto;font-size:12px;line-height:16px}
:root{--pagefind-ui-primary:var(--accent);--pagefind-ui-text:var(--fg);--pagefind-ui-background:var(--surface);--pagefind-ui-border:var(--rule);--pagefind-ui-tag:var(--chip);--pagefind-ui-font:var(--font);--pagefind-ui-border-radius:12px;--pagefind-ui-border-width:1px}
@media (prefers-reduced-motion:reduce){html,html.smooth{scroll-behavior:auto}*,*::before,*::after{transition-duration:300ms!important;transition-property:opacity!important}.reveal,.mpanel a{transform:none!important}.card:hover{transform:none}}