/* PHINET: neutral monochrome (black, white, warm greys), system fonts (no third-party font requests).
   Accessibility: WCAG 2.2 AA contrast for every text/background pair below, visible focus on every
   interactive element, 24px+ targets, reduced-motion, forced-colors and increased-contrast support. */
:root{
  --bg:#ffffff; --surface:#fafaf9; --fg:#0a0a0a; --muted:#57534e; --line:#e7e5e4; --line-2:#d6d3d1;
  --accent:#0a0a0a; --on-accent:#ffffff; --focus:#2563eb;
  --ink:#0a0a0a; --on-ink:#fafaf9; --on-ink-muted:#a8a29e; --ink-line:#292524;
  --ok:#14532d; --wip:#7c2d12; --crit:#dc2626; --high:#ea580c; --med:#ca8a04;
  --sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --radius:12px;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0a0a0a; --surface:#141414; --fg:#fafaf9; --muted:#a8a29e; --line:#262626; --line-2:#3a3a3a;
  --accent:#fafaf9; --on-accent:#0a0a0a; --focus:#60a5fa;
  --ink:#000000; --ink-line:#262626;
  --ok:#4ade80; --wip:#fbbf24;
  color-scheme:dark}}
@media (prefers-contrast:more){:root{--muted:var(--fg); --line:var(--fg); --line-2:var(--fg)}}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:88px} /* 2.4.12/2.4.13: focused items never hide under the sticky header */
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.65 var(--sans);-webkit-font-smoothing:antialiased}
a{color:var(--fg);text-decoration:underline;text-decoration-color:var(--line-2);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-color:currentColor}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:4px}
h1,h2,h3{line-height:1.12;margin:0 0 .5em;text-wrap:balance;letter-spacing:-.025em;font-weight:600}
h1{font-size:clamp(2.3rem,5.2vw,4rem)}
h2{font-size:clamp(1.7rem,3.2vw,2.4rem)}
h3{font-size:1.15rem;letter-spacing:-.01em}
p{margin:0 0 1em}
.wrap{max-width:1120px;margin:0 auto;padding-left:max(20px,env(safe-area-inset-left));padding-right:max(20px,env(safe-area-inset-right))}

/* Skip link: visible on keyboard focus */
.skip{position:absolute;left:-999px;top:0}
.skip:focus{left:12px;top:12px;background:var(--accent);color:var(--on-accent);padding:10px 16px;border-radius:999px;z-index:9;text-decoration:none}

/* Header */
header.site{background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}
.brand{color:var(--fg);text-decoration:none;font-weight:700;letter-spacing:.06em;display:flex;align-items:center;gap:10px}
.mark{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:8px;background:var(--accent);color:var(--on-accent);font-size:1rem}
nav{display:flex;gap:4px 6px;flex-wrap:wrap;align-items:center;font-size:.95rem}
nav a{color:var(--muted);text-decoration:none;padding:0 12px;border-radius:999px;min-height:44px;display:inline-flex;align-items:center} /* 2.5.5 AAA: 44px targets */
nav a[aria-current="page"]{color:var(--fg);background:var(--surface);box-shadow:inset 0 0 0 1px var(--line-2)} /* 2.4.8 location */
nav a:hover{color:var(--fg);background:var(--surface)}
.cta-sm{background:var(--accent);color:var(--on-accent)!important;padding:8px 16px!important;font-weight:600}
.cta-sm:hover{opacity:.88;background:var(--accent)!important}

/* Hero */
.hero{padding:96px 0 88px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.hero-copy{min-width:0}
.eyebrow{font-size:.85rem;letter-spacing:.02em;color:var(--muted);display:inline-block;border:1px solid var(--line);border-radius:999px;padding:4px 12px;margin-bottom:20px}
.lede{font-size:1.2rem;color:var(--muted);max-width:58ch}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.btn{display:inline-flex;align-items:center;min-height:44px;background:var(--accent);color:var(--on-accent);padding:12px 22px;border-radius:999px;font-weight:600;text-decoration:none;border:1px solid var(--accent)}
.btn:hover{opacity:.88}
.btn.ghost{background:transparent;color:var(--fg);border-color:var(--line-2)}
.btn.ghost:hover{background:var(--surface);opacity:1}

/* Example terminal card (always dark, like a code block) */
.terminal{background:var(--ink);border:1px solid var(--ink-line);border-radius:var(--radius);overflow:hidden;min-width:0;box-shadow:0 1px 2px rgb(0 0 0/.06),0 12px 32px rgb(0 0 0/.08)}
.term-head{display:flex;gap:6px;align-items:center;padding:10px 14px;border-bottom:1px solid var(--ink-line);font-family:var(--mono);font-size:.78rem;color:var(--on-ink-muted)}
.term-head span{width:10px;height:10px;border-radius:50%;background:#3f3f46}.term-head b{margin-left:8px;font-weight:400}
.terminal pre{margin:0;padding:18px;overflow-x:auto;font:14px/1.75 var(--mono);color:var(--on-ink)}
.k{color:var(--on-ink-muted)}.crit{color:#f87171}.high{color:#fb923c}.med{color:#facc15}
.term-note{margin:0;padding:0 18px 14px;font-size:.78rem;color:var(--on-ink-muted)}

/* Sections */
section{padding:88px 0}
.band{background:var(--surface);border-block:1px solid var(--line)}
.sub{color:var(--muted);max-width:65ch}
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:32px}
.grid3 article{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:var(--bg)}
.grid3 p{color:var(--muted);margin:0}
.table-wrap{overflow-x:auto;margin-top:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg)}
.table-wrap:focus-visible{outline-offset:2px}
table{border-collapse:collapse;width:100%;min-width:560px}
caption{text-align:left;padding:14px 18px 0;color:var(--muted);font-size:.9rem}
th,td{text-align:left;padding:14px 18px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.8rem;letter-spacing:.02em;color:var(--muted);font-weight:500;background:var(--surface)}
tr:last-child td{border-bottom:0}
td.num{font-variant-numeric:tabular-nums;font-weight:600;white-space:nowrap}
.steps{list-style:none;padding:0;margin:32px 0 0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px;counter-reset:s}
.steps li{counter-increment:s;border-top:1px solid var(--fg);padding-top:14px;display:flex;flex-direction:column;gap:6px}
.steps li b::before{content:counter(s,decimal-leading-zero) "  ";color:var(--muted);font-family:var(--mono);font-weight:400}
.steps span{color:var(--muted);font-size:.95rem}
.about{display:grid;grid-template-columns:1.4fr 1fr;gap:56px}
.about p{max-width:65ch}
.facts{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:18px}
.facts li{border-left:2px solid var(--fg);padding-left:14px;display:flex;flex-direction:column}
.facts span{color:var(--muted)}
.contact{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.contact-card{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:var(--surface)}
.contact-card p{display:flex;flex-direction:column;margin:0 0 14px}.contact-card p:last-child{margin:0}
.label{font-size:.8rem;letter-spacing:.02em;color:var(--muted)}

/* Footer */
footer.site{border-top:1px solid var(--line);color:var(--muted);padding:32px 0;font-size:.92rem}
.foot{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}.foot p{margin:0}
footer a{color:var(--muted);display:inline-flex;align-items:center;min-height:44px;padding:0 4px}footer a:hover{color:var(--fg)}

/* Documents (privacy, trust, accessibility) */
.doc{max-width:780px;padding-block:64px}
.doc h2{font-size:1.4rem;margin-top:1.8em}
.doc ul{padding-left:1.2em}
.doc p,.doc li{max-width:75ch} /* 1.4.8 AAA: lines under 80 characters */
p{margin-bottom:1.1em}
/* 3.1.5 AAA: plain-language summary */
.plain{border-left:2px solid var(--fg);padding:4px 0 4px 16px;margin:20px 0 24px;max-width:65ch}
.plain p{margin:0}
abbr[title]{text-decoration:underline dotted;text-underline-offset:3px;cursor:help}

@media (max-width:900px){
  .hero-grid,.about,.contact{grid-template-columns:1fr}
  .grid3{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr}
}
@media (max-width:560px){
  .grid3,.steps{grid-template-columns:1fr}
  nav{font-size:.9rem}
  nav a{padding:0 10px}
  section{padding:56px 0}.hero{padding:56px 0 60px}
}

/* Trust Center (agents/tin): status pills carry text, never colour alone */
.trust .summary{margin:8px 0 28px;display:flex;gap:8px;flex-wrap:wrap;align-items:center;color:var(--muted)}
.pill{display:inline-block;padding:2px 10px;border-radius:999px;font-size:.8rem;font-weight:600;white-space:nowrap;border:1px solid var(--line-2);color:var(--fg)}
.pill.ok{color:var(--ok);border-color:currentColor}
.pill.wip{color:var(--wip);border-color:currentColor}
.pill.plan{color:var(--muted)}
.trust .sub{color:var(--muted);font-size:.92rem}

/* Windows high-contrast / forced colours: keep borders and focus visible */
@media (forced-colors:active){
  .btn,.cta-sm,.pill,.mark{border:1px solid ButtonText}
  :focus-visible{outline-color:Highlight}
}
@media print{header.site,.skip,.actions{display:none}body{font-size:12pt}a{text-decoration:underline}}