/* Payne Docs — diagnostic site design system. Restrained B2B consultancy.
   Self-contained: system fonts only, no external resource loads. */

:root{
  --ink:#141821;        /* headings / near-black */
  --body:#454c57;       /* body text */
  --muted:#6a7280;      /* secondary */
  --faint:#8b929c;
  --line:#e3e7ec;       /* borders */
  --line-soft:#eef1f5;
  --bg:#ffffff;
  --bg-alt:#f6f8fa;     /* alternating sections */
  --accent:#1b3a5b;     /* deep navy */
  --accent-ink:#12293f;
  --accent-tint:#eef2f7;
  --amber-bg:#fbf6ea;
  --amber-line:#ecdcb8;
  --amber-ink:#7a5c1e;
  --serif:"Iowan Old Style",Georgia,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --wrap:1080px;
  --measure:680px;
  --radius:12px;
  --shadow:0 1px 2px rgba(20,24,33,.04),0 6px 20px rgba(20,24,33,.05);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:var(--sans);color:var(--body);background:var(--bg);
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
h1,h2,h3{font-family:var(--serif);color:var(--ink);line-height:1.18;font-weight:600;letter-spacing:-.01em;overflow-wrap:break-word}
h1{font-size:clamp(1.72rem,5.2vw,2.85rem);margin:0 0 .4em}
h2{font-size:clamp(1.5rem,3vw,1.9rem);margin:0 0 .5em}
h3{font-size:1.12rem;margin:0 0 .35em;font-family:var(--sans);font-weight:700;color:var(--ink);letter-spacing:0}
p{margin:0 0 1rem}
a{color:var(--accent);text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1px}
a:hover{color:var(--accent-ink)}
strong{color:var(--ink);font-weight:650}
small{font-size:.86rem}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
img{max-width:100%}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.measure{max-width:var(--measure)}
.section{padding:72px 0;border-top:1px solid var(--line-soft)}
.section--alt{background:var(--bg-alt)}
.section--tight{padding:52px 0}
.eyebrow{font-family:var(--sans);font-size:.78rem;font-weight:700;letter-spacing:.09em;
  text-transform:uppercase;color:var(--accent);margin:0 0 .8rem}
.lede{font-size:1.15rem;color:var(--muted);max-width:var(--measure)}
.muted{color:var(--muted)}
.fine{font-size:.86rem;color:var(--faint)}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(1.1) blur(6px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px;min-height:62px}
.brand{min-width:0}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);
  text-decoration:none;font-size:1.02rem;letter-spacing:-.01em}
.brand .mark{width:26px;height:26px;border-radius:6px;background:var(--accent);color:#fff;
  font-family:var(--serif);font-weight:600;display:grid;place-items:center;font-size:.82rem}
.brand small{display:block;font-weight:500;color:var(--muted);font-size:.72rem;letter-spacing:.02em}
.nav{margin-left:auto;display:flex;align-items:center;gap:22px}
.nav a{color:var(--body);text-decoration:none;font-size:.92rem;font-weight:500}
.nav a:hover{color:var(--accent)}
.chip{font-size:.74rem;font-weight:600;color:var(--amber-ink);background:var(--amber-bg);
  border:1px solid var(--amber-line);border-radius:999px;padding:4px 11px;white-space:nowrap}

/* hero */
.hero{padding:78px 0 64px}
.hero .who{color:var(--muted);font-weight:500}
.pricebar{display:flex;flex-wrap:wrap;align-items:center;gap:14px 22px;margin-top:26px;
  padding:22px 24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.price{font-family:var(--serif);font-size:2.3rem;color:var(--ink);line-height:1;font-weight:600}
.price .u{font-family:var(--sans);font-size:.9rem;color:var(--muted);font-weight:500;margin-left:6px}
.pricebar .meta{color:var(--muted);font-size:.92rem}
.pricebar .spacer{flex:1 1 20px}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--sans);font-size:1rem;
  font-weight:600;border-radius:9px;padding:12px 20px;border:1px solid transparent;cursor:pointer;text-decoration:none}
.btn--primary{background:var(--accent);color:#fff}
.btn--primary:hover{background:var(--accent-ink);color:#fff}
.btn[disabled],.btn--disabled{background:#eef0f3;color:#9aa1ac;border-color:#e4e7ec;
  cursor:not-allowed;box-shadow:none}
.avail{display:flex;align-items:flex-start;gap:10px;margin-top:14px;padding:12px 14px;
  background:var(--amber-bg);border:1px solid var(--amber-line);border-radius:10px;color:var(--amber-ink);font-size:.9rem}
.avail svg{flex:0 0 auto;margin-top:2px}

/* cards / grid */
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.card h3{margin-top:0}
.card .num{width:30px;height:30px;border-radius:8px;background:var(--accent-tint);color:var(--accent);
  font-weight:700;display:grid;place-items:center;font-size:.9rem;margin-bottom:12px}
ul.clean,ol.clean{margin:0;padding-left:1.15em}
ul.clean li,ol.clean li{margin:.4em 0}
.checklist{list-style:none;margin:0;padding:0}
.checklist li{position:relative;padding-left:30px;margin:.55em 0}
.checklist li::before{content:"";position:absolute;left:2px;top:.28em;width:16px;height:16px;border-radius:50%;
  background:var(--accent-tint);box-shadow:inset 0 0 0 1px #cdd8e4}
.checklist li::after{content:"";position:absolute;left:7px;top:.55em;width:5px;height:9px;
  border:solid var(--accent);border-width:0 2px 2px 0;transform:rotate(45deg)}

.split{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.04em;padding:2px 8px;border-radius:5px;
  text-transform:uppercase;vertical-align:middle}
.tag--obs{background:#eaf2ec;color:#2f6b45}
.tag--hyp{background:#eef1f7;color:#3a4d7a}
.tag--fact{background:#f2edf7;color:#5a3d78}

/* FAQ */
details.faq{border:1px solid var(--line);border-radius:10px;background:#fff;padding:2px 18px;margin:10px 0}
details.faq>summary{cursor:pointer;font-weight:650;color:var(--ink);padding:14px 0;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:12px}
details.faq>summary::-webkit-details-marker{display:none}
details.faq>summary::after{content:"+";color:var(--accent);font-size:1.2rem;font-weight:400}
details.faq[open]>summary::after{content:"–"}
details.faq>div{padding:0 0 16px;color:var(--body)}

/* notice banner (drafts/legal) */
.notice{background:var(--amber-bg);border:1px solid var(--amber-line);color:var(--amber-ink);
  border-radius:10px;padding:14px 16px;font-size:.92rem;margin:0 0 24px}
.notice strong{color:var(--amber-ink)}

/* doc content (sample/policies) */
.doc h2{margin-top:1.6em}
.doc h3{margin-top:1.4em}
.doc hr{border:none;border-top:1px solid var(--line);margin:2em 0}
.doc table{border-collapse:collapse;width:100%;margin:1em 0;font-size:.95rem}
.doc th,.doc td{border:1px solid var(--line);padding:8px 12px;text-align:left;vertical-align:top}
.doc th{background:var(--bg-alt)}

/* footer */
.site-footer{background:#101722;color:#c3cbd6;padding:52px 0 40px;margin-top:8px}
.site-footer a{color:#dbe4ef}
.site-footer .cols{display:flex;flex-wrap:wrap;gap:34px 60px;justify-content:space-between}
.site-footer h4{color:#fff;font-family:var(--sans);font-size:.82rem;letter-spacing:.06em;
  text-transform:uppercase;margin:0 0 12px}
.site-footer p,.site-footer li{font-size:.9rem;color:#a9b3c1}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:.35em 0}
.site-footer .base{border-top:1px solid #23303f;margin-top:30px;padding-top:20px;font-size:.82rem;color:#8593a3}

.anchor{scroll-margin-top:80px}

@media (max-width:820px){
  .grid-3{grid-template-columns:1fr}
  .grid-2,.split{grid-template-columns:1fr}
  .nav{display:none}
  .chip{display:none}          /* hero already states availability; frees header width */
  .section{padding:56px 0}
  .hero{padding:56px 0 48px}
}
@media (max-width:400px){
  body{font-size:16px}
  .wrap{padding:0 18px}
  .price{font-size:2rem}
}