/* Open Book. The house variables of CognitionSync Labs, with a teal accent of its own. */
:root{
  --bg:#f8f6f1; --panel:#ffffff; --panel-2:#f3f0e9; --line:#e7e3da;
  --text:#151514; --muted:#5b5850; --faint:#7d7a6c;
  --accent:#0f766e; --accent-wash:rgba(15,118,110,.08); --accent-ink:#2dd4bf;
  --ink:#0d1117; --ink-text:#f4f2ee;
  --sans:'Inter',system-ui,sans-serif; --mono:'JetBrains Mono',ui-monospace,monospace;
}
*{box-sizing:border-box;margin:0}
[hidden]{display:none !important}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--sans);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-wrap:break-word}
.container{max-width:1140px;margin:0 auto;padding:0 28px}
@media(max-width:480px){.container{padding:0 16px}}
a{color:inherit}
a:hover{color:var(--accent)}
code,pre{font-family:var(--mono);font-size:.86em}
code{background:var(--panel-2);border:1px solid var(--line);border-radius:5px;padding:1px 5px;overflow-wrap:anywhere}
pre{background:var(--ink);color:var(--ink-text);border-radius:10px;padding:16px 18px;overflow-x:auto;line-height:1.5;margin:14px 0}
pre code{background:none;border:0;padding:0;color:inherit;font-size:.82rem;white-space:pre-wrap;overflow-wrap:anywhere}
.skip{position:absolute;left:-9999px;top:8px;background:var(--panel);color:var(--text);padding:8px 12px;border-radius:8px;z-index:30}
.skip:focus{left:12px}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,.yours:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.hero-band a:focus-visible{outline-color:var(--accent-ink)}
main:focus{outline:none}

/* top band */
.hero-band{background:var(--ink);color:var(--ink-text);padding-bottom:56px}
nav.top{display:flex;align-items:center;gap:8px 20px;padding:20px 0;flex-wrap:wrap}
.logo{font-weight:500;letter-spacing:-.02em;text-decoration:none;color:var(--ink-text)}
.logo b{font-weight:600;color:var(--accent-ink)}
.tagchip{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:#a9a597;border:1px solid rgba(244,242,238,.18);padding:3px 9px;border-radius:99px}
.sp{flex:1}
nav.top a:not(.logo){text-decoration:none;font-size:.9rem;color:rgba(244,242,238,.74);transition:color .2s}
nav.top a:not(.logo):hover,nav.top a[aria-current]{color:var(--ink-text)}
nav.top a[aria-current]{text-decoration:underline;text-decoration-color:var(--accent-ink);text-underline-offset:5px}
.crumbs ol{list-style:none;padding:0;display:flex;flex-wrap:wrap;gap:4px 0;font-size:.8rem;color:rgba(244,242,238,.6);margin-top:18px}
.crumbs li+li::before{content:"\203A";margin:0 8px;color:rgba(244,242,238,.4)}
.crumbs a{color:rgba(244,242,238,.75)}
.crumbs a:hover{color:var(--ink-text)}
.pill{display:inline-flex;align-items:center;gap:9px;font-size:.8rem;color:rgba(244,242,238,.74);border:1px solid rgba(244,242,238,.16);padding:6px 14px;border-radius:99px;margin:28px 0 20px}
.pill .dot{width:6px;height:6px;border-radius:50%;background:var(--accent-ink);flex:none}
h1{font-weight:300;font-size:clamp(2rem,5vw,3.3rem);line-height:1.1;letter-spacing:-.025em;max-width:24ch;text-wrap:balance}
h1 em{font-style:normal;font-weight:500}
.sub{color:rgba(244,242,238,.7);font-size:1.06rem;max-width:66ch;margin-top:18px}
.metaline{color:rgba(244,242,238,.6);font-size:.86rem;margin-top:14px}
.stats{display:flex;gap:24px 44px;margin-top:32px;flex-wrap:wrap}
.stat .n{font-family:var(--mono);font-size:1.75rem;font-weight:500;letter-spacing:-.02em}
.stat .l{font-size:.82rem;color:rgba(244,242,238,.6);margin-top:2px;max-width:22ch}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:32px}

.btn{display:inline-flex;align-items:center;justify-content:center;font:inherit;font-size:.95rem;font-weight:500;text-decoration:none;background:var(--accent);color:#fff;border:1px solid var(--accent);border-radius:10px;padding:11px 18px;cursor:pointer;transition:filter .15s}
.btn:hover{filter:brightness(1.1);color:#fff}
.btn[disabled]{opacity:.55;cursor:default}
.btn.ghost{background:transparent;color:var(--ink-text);border-color:rgba(244,242,238,.3)}
.btn.line{background:var(--panel);color:var(--text);border-color:var(--line)}
.btn.line:hover{border-color:var(--accent);color:var(--accent);filter:none}
.size{font-size:.8rem;color:var(--faint);margin-left:8px;font-family:var(--mono)}

/* sections */
section{padding:60px 0}
@media(max-width:600px){section{padding:44px 0}}
.band{background:var(--panel-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.eyebrow{font-size:.74rem;letter-spacing:.11em;text-transform:uppercase;color:var(--faint);margin-bottom:12px}
h2{font-weight:300;font-size:clamp(1.55rem,3.2vw,2.2rem);line-height:1.16;letter-spacing:-.02em;max-width:30ch;text-wrap:balance}
h2 em{font-style:normal;font-weight:500}
h3{font-weight:500;font-size:1.08rem;line-height:1.3}
.lede{color:var(--muted);max-width:70ch;margin-top:14px}
.colist{margin:16px 0 0 0;padding-left:20px;display:grid;gap:6px;max-width:80ch;color:var(--muted)}
.colist a{color:var(--text);font-weight:500}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:28px}
@media(max-width:920px){.cards{grid-template-columns:1fr}}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px 24px;min-width:0;display:flex;flex-direction:column;gap:10px}
.card h3 a{text-decoration:none}
.card h3 a:hover{text-decoration:underline}
.card p{color:var(--muted);font-size:.93rem}
.card .eyebrow{margin:0}
.cardfoot{margin-top:auto;padding-top:6px}
.cap{font-size:.82rem;color:var(--faint)}
.cols{display:grid;gap:22px;margin-top:28px}
.cols.two{grid-template-columns:repeat(2,minmax(0,1fr))}
@media(max-width:860px){.cols.two{grid-template-columns:1fr}}
.steps{list-style:none;counter-reset:s;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;margin-top:28px}
@media(max-width:980px){.steps{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:560px){.steps{grid-template-columns:1fr}}
.steps li{counter-increment:s;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px 22px;min-width:0}
.steps li::before{content:counter(s);display:inline-block;font-family:var(--mono);font-size:.82rem;color:var(--accent);border:1px solid var(--accent);border-radius:99px;width:26px;height:26px;line-height:24px;text-align:center;margin-bottom:10px}
.steps p{color:var(--muted);font-size:.92rem;margin-top:6px}
.dims{margin-top:22px;padding-left:22px;display:grid;gap:8px;max-width:84ch;color:var(--muted)}
.dims b{color:var(--text);font-weight:500}
.minis{display:flex;flex-wrap:wrap;gap:14px;margin:24px 0}
.mini{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 18px;min-width:130px}
.mini .n{display:block;font-family:var(--mono);font-size:1.5rem;font-weight:500}
.mini .l{font-size:.8rem;color:var(--muted)}
.alist,.answers{list-style:none;padding:0;margin-top:20px;display:grid;gap:10px}
.alist{grid-template-columns:repeat(2,minmax(0,1fr))}
@media(max-width:760px){.alist{grid-template-columns:1fr}}
.alist a{display:block;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 16px;text-decoration:none}
.alist a:hover{border-color:var(--accent)}
.answers li{border-bottom:1px solid var(--line);padding:18px 0}
.answers .aq{font-size:1.15rem;font-weight:500;max-width:none}
.answers .aq a{text-decoration:none}
.answers .aq a:hover{text-decoration:underline}
.answers p{color:var(--muted);margin-top:6px;max-width:80ch}

/* articles */
.prose{max-width:820px}
.prose > * + *, .prose article > * + *{margin-top:14px}
.prose h2{margin-top:40px;font-size:clamp(1.35rem,2.6vw,1.7rem);max-width:none}
.prose h3{margin-top:24px}
.prose ul,.prose ol{padding-left:22px;display:grid;gap:6px}
.prose p,.prose li{max-width:72ch}
.lead{font-size:1.14rem;line-height:1.55;color:var(--text)}
.toc ol{padding-left:22px}
.facts{display:grid;gap:0;border-top:1px solid var(--line);margin-top:22px}
.facts div{display:grid;grid-template-columns:170px minmax(0,1fr);gap:14px;padding:12px 0;border-bottom:1px solid var(--line)}
@media(max-width:560px){.facts div{grid-template-columns:1fr;gap:2px}}
.facts dt{font-size:.72rem;letter-spacing:.09em;text-transform:uppercase;color:var(--faint);padding-top:3px}
.facts dd{font-size:.96rem}
.timeline{list-style:none;padding:0}
.timeline li{border-left:2px solid var(--accent);padding:2px 0 2px 14px}
.chip{display:inline-block;font-size:.74rem;font-weight:500;border-radius:99px;padding:2px 10px;border:1px solid var(--line);background:var(--panel-2);color:var(--text);white-space:nowrap;margin-right:6px}
.chip.s-required,.chip.s-allowed{background:var(--accent-wash);border-color:var(--accent);color:var(--accent)}
.chip.s-optional,.chip.s-pilot,.chip.s-mixed{background:#fbf3df;border-color:#d6b25e;color:#6b5210}
.chip.s-banned{background:#f8e9e6;border-color:#d39a8f;color:#8a2f20}
.chip.s-unstated{background:var(--panel-2);color:var(--muted)}
.sublabel{display:block;font-size:.82rem;color:var(--muted);margin-top:3px}
.tw{overflow-x:auto;margin-top:16px;max-width:100%}
table{border-collapse:collapse;width:100%}
table.data{font-size:.9rem;background:var(--panel);border:1px solid var(--line);border-radius:12px}
table.data caption,table.counts caption,table.levels caption{text-align:left;font-weight:500;padding:0 0 8px;font-size:.92rem}
table.data th,table.data td{text-align:left;vertical-align:top;padding:11px 14px;border-top:1px solid var(--line)}
table.data thead th{font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);font-weight:500;border-top:0}
table.data tbody th{font-weight:500;white-space:nowrap}
@media(max-width:640px){table.data{font-size:.84rem}table.data th,table.data td{padding:9px 10px}table.data tbody th{white-space:normal}}
table.levels{font-size:.92rem;background:var(--panel);border:1px solid var(--line)}
table.levels th,table.levels td{text-align:left;vertical-align:top;padding:10px 14px;border-top:1px solid var(--line)}
table.levels thead th{font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);font-weight:500;border-top:0}
table.levels tbody th{width:110px;font-weight:500}
table.counts{font-size:.92rem;margin-top:18px;background:var(--panel);border:1px solid var(--line);max-width:640px}
table.counts th,table.counts td{text-align:left;padding:8px 14px;border-top:1px solid var(--line);vertical-align:top}
table.counts th{font-weight:400;color:var(--muted)}
table.counts td.n{font-family:var(--mono);font-variant-numeric:tabular-nums;white-space:nowrap;color:var(--text)}
table.counts td.note{font-size:.8rem;color:var(--faint)}
@media(max-width:520px){table.counts td.note{display:none}}
.dim{padding-top:6px}
.dim + .dim{margin-top:44px}
.dim h2{margin-top:0}
.num{font-family:var(--mono);font-size:.9rem;color:var(--accent);border:1px solid var(--accent);border-radius:99px;display:inline-block;width:30px;height:30px;line-height:28px;text-align:center;vertical-align:middle;margin-right:6px}
.why{font-size:.92rem;color:var(--muted)}
.why b{color:var(--text);font-weight:500}
.sources{margin-top:44px;border-top:1px solid var(--line);padding-top:22px}
.sources h2{margin-top:0;font-size:1.2rem}
.sources ol{font-size:.88rem;display:grid;gap:8px}
.src-meta{display:block;color:var(--faint);font-size:.8rem}
.checked{font-size:.86rem;color:var(--muted)}
.related{margin-top:30px}
.related h2{margin-top:0;font-size:1.2rem}
.related ul{list-style:none;padding:0;display:grid;gap:8px}
.related a{display:block;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:10px 14px;text-decoration:none}
.related a:hover{border-color:var(--accent)}
details{margin-top:18px}
summary{cursor:pointer;color:var(--muted);width:fit-content;border-radius:4px}
.files{font-size:.84rem}
.ad{margin-top:30px}

/* forms */
.form{display:grid;gap:6px;margin-top:10px}
.form label{font-size:.82rem;color:var(--muted);margin-top:8px}
.form .opt{color:var(--faint)}
.form input,.form select{width:100%;font:inherit;font-size:.95rem;padding:10px 12px;border:1px solid var(--line);border-radius:9px;background:var(--bg);color:var(--text)}
.form .btn{margin-top:14px;justify-self:start}
.form .hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.fmsg{font-size:.88rem;color:var(--muted);min-height:1.3em}
.fmsg.err{color:#8a2f20;font-weight:500}
.done{margin-top:10px;padding:14px 16px;border:1px solid var(--accent);background:var(--accent-wash);border-radius:10px;font-size:.95rem}
.formnote{font-size:.8rem;color:var(--faint)}
.price{font-family:var(--mono);font-size:1.5rem;font-weight:500;letter-spacing:-.02em}
.price small{font-size:.8rem;color:var(--faint);font-weight:400;font-family:var(--sans)}
.fine{font-size:.84rem;color:var(--muted);border-left:3px solid var(--text);padding:8px 12px;background:var(--panel-2);border-radius:6px}

/* stats tool */
.tool{max-width:820px}
.drop{border:2px dashed var(--line);border-radius:14px;padding:26px 24px;background:var(--panel)}
.drop.over{border-color:var(--accent);background:var(--accent-wash)}
.droph{font-size:1.05rem;margin-bottom:10px}
.droph label{font-weight:500;color:var(--accent);text-decoration:underline;cursor:pointer}
.drop input[type=file]{font:inherit;font-size:.9rem;max-width:100%;margin-bottom:10px}
.status{font-size:.9rem;color:var(--muted);min-height:1.4em;margin-top:12px}
.yours{margin-top:10px}
.yours h3{margin-top:10px}

/* plain answer pages from the form API, with JavaScript off */
.plainpage{padding:60px 0}
.narrow{max-width:640px}
.plainh1{color:var(--text);font-size:2rem;margin-bottom:12px}
.plainpage .btn{margin-top:16px;margin-right:8px}

footer{background:var(--ink);color:rgba(244,242,238,.66);padding:44px 0 36px;font-size:.88rem}
footer a{color:rgba(244,242,238,.8)}
footer a:hover{color:var(--ink-text)}
.fcols{display:flex;gap:24px 40px;flex-wrap:wrap;justify-content:space-between}
.flogo{font-weight:500;color:var(--ink-text);font-size:1rem;margin-bottom:6px}
.flogo b{color:var(--accent-ink);font-weight:600}
footer nav{display:flex;flex-wrap:wrap;gap:8px 18px;max-width:560px}
footer nav a{text-decoration:none}
.fine-print{margin-top:26px;border-top:1px solid rgba(244,242,238,.12);padding-top:18px;display:grid;gap:6px;font-size:.8rem;color:rgba(244,242,238,.55)}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn,nav.top a{transition:none}}