/* CHRS v2 shared design system — extracted from the August 2026 humanized pages.
   Tokens, navigation, typography, cards, buttons, footer, reveal motion,
   responsive breakpoints and accessibility media queries live here so all
   pages stay visually coherent. Page-specific styles remain inline per page. */

:root{
  --bg:#f5f3ee;
  --paper:#fbfaf7;
  --ink:#142024;
  --muted:#657176;
  --line:rgba(20,32,36,.12);
  --line-strong:rgba(20,32,36,.22);
  --accent:#d86745;
  --accent-soft:#f0b17b;
  --cool:#4f7f83;
  --deep:#183337;
  --green:#477564;
  --warm:#e7a05f;
  --white:#ffffff;
  --shadow:0 18px 60px rgba(18,32,36,.08);
  --radius:22px;
  --max:1220px;
  --ease-out:cubic-bezier(.23,1,.32,1);
  --ease-in-out:cubic-bezier(.77,0,.175,1);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{
  margin:0;
  background:
    radial-gradient(circle at 8% 0%, rgba(216,103,69,.05), transparent 27rem),
    var(--bg);
  color:var(--ink);
  font-family:ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height:1.55;
  letter-spacing:-.01em;
}

a{color:inherit}
a,button,summary,select{touch-action:manipulation}
button,input,select{font:inherit}
img,svg,canvas{display:block;max-width:100%}

.skip-link{
  position:fixed;left:12px;top:10px;z-index:1000;
  padding:.65rem .85rem;border-radius:10px;background:var(--deep);color:#fff;
  transform:translateY(-160%);transition:transform 160ms var(--ease-out);text-decoration:none
}
.skip-link:focus{transform:translateY(0)}
:where(a,button,summary,select):focus-visible{outline:3px solid rgba(79,127,131,.55);outline-offset:3px}

.container{width:min(calc(100% - 40px), var(--max));margin-inline:auto}

/* ---------- navigation ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  border-bottom:1px solid transparent;
  background:rgba(245,243,238,.8);
  backdrop-filter:blur(18px);
  transition:border-color 180ms ease,box-shadow 220ms var(--ease-out),background-color 220ms ease;
}
.nav.scrolled{border-color:var(--line);box-shadow:0 8px 30px rgba(20,32,36,.04)}
.nav-inner{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{
  min-height:44px;display:inline-flex;align-items:center;gap:11px;
  text-decoration:none;font-weight:800;letter-spacing:-.04em;
}
.brand .sub{font-weight:500;color:var(--muted)}
.mark{
  width:34px;height:34px;position:relative;flex:none;
  border:1px solid var(--line-strong);border-radius:11px;overflow:hidden;background:var(--paper);
}
.mark::before,.mark::after{content:"";position:absolute;border-radius:999px;filter:blur(.1px)}
.mark::before{width:28px;height:28px;left:-4px;top:-5px;border:6px solid rgba(216,103,69,.55)}
.mark::after{width:25px;height:25px;right:-7px;bottom:-7px;border:6px solid rgba(79,127,131,.58)}
.nav-links{display:flex;align-items:center;gap:22px;font-size:.86rem;color:var(--muted)}
.nav-links a{min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;text-decoration:none;transition:color 160ms ease}
.nav-links a[aria-current="page"],
.nav-links a[aria-current="location"]{color:var(--ink);font-weight:750;box-shadow:inset 0 -2px var(--cool)}
.nav-cta{
  padding:.68rem .95rem;border:1px solid var(--line-strong);border-radius:999px;
  color:var(--ink)!important;background:rgba(255,255,255,.45);
}
.mobile-nav{display:none;position:relative}
.mobile-nav summary{min-height:44px;display:inline-flex;align-items:center;gap:8px;padding:.58rem .78rem;border:1px solid var(--line-strong);border-radius:999px;background:rgba(255,255,255,.48);color:var(--ink);font-size:.78rem;font-weight:750;cursor:pointer;list-style:none}
.mobile-nav summary::-webkit-details-marker{display:none}
.mobile-nav summary:after{content:"+";font-size:1rem;line-height:1}
.mobile-nav[open] summary:after{content:"−"}
.mobile-nav summary:focus-visible{outline:3px solid rgba(79,127,131,.42);outline-offset:3px}
.mobile-nav[open]::before{content:"";position:fixed;inset:0;background:rgba(20,32,36,.24);backdrop-filter:blur(2px);z-index:80;pointer-events:none}
.mobile-nav-menu{position:absolute;right:0;top:calc(100% + 8px);z-index:90;min-width:230px;max-height:calc(100dvh - 90px);overflow-y:auto;overscroll-behavior:contain;padding:7px;border:1px solid var(--line);border-radius:16px;background:var(--paper);box-shadow:0 18px 45px rgba(20,32,36,.13);display:grid}
.mobile-nav-menu a{min-height:44px;padding:.65rem .75rem;border-radius:10px;text-decoration:none}
.mobile-nav-menu a[aria-current="page"],.mobile-nav-menu a[aria-current="location"]{background:rgba(79,127,131,.10);color:var(--ink);font-weight:750}
.mobile-nav-label{padding:.65rem .75rem .3rem;color:var(--muted);font-size:.75rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase;border-top:1px solid var(--line)}
.mobile-nav-label:first-child{border-top:0}

/* ---------- typography ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  font-size:.76rem;font-weight:750;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--line-strong)}
h1{margin:18px 0 22px;font-size:clamp(3.2rem,6vw,6.6rem);line-height:.92;letter-spacing:-.072em;max-width:800px}
h2{margin:12px 0 0;font-size:clamp(2.1rem,4vw,4rem);line-height:1;letter-spacing:-.055em}
.lede{font-size:1.15rem;color:#425157;max-width:780px;line-height:1.62;margin-top:0}
.stage-note{margin-top:20px;padding-left:14px;border-left:2px solid rgba(79,127,131,.45);max-width:650px;color:var(--muted);font-size:.83rem;line-height:1.55}
.stage-note strong{color:var(--ink);font-weight:750}

section{padding:96px 0;border-top:1px solid var(--line)}
.section-grid{display:grid;grid-template-columns:.72fr 1.28fr;gap:76px;align-items:start}
.section-grid>*{min-width:0}
.sticky-title{position:sticky;top:105px}

.hero{padding:64px 0 52px}
.hero-grid{display:grid;grid-template-columns:minmax(0,.85fr) minmax(480px,1.15fr);gap:56px;align-items:center}
.hero-grid>*{min-width:0}
.hero-copy{max-width:660px;font-size:clamp(1.03rem,1.5vw,1.22rem);color:#47565b;line-height:1.6}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:28px}

/* ---------- buttons, pills, badges ---------- */
.btn{
  min-height:46px;display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:.76rem 1.06rem;border-radius:999px;border:1px solid var(--line-strong);
  text-decoration:none;font-weight:700;font-size:.9rem;
  background:rgba(255,255,255,.5);cursor:pointer;
  transition:color 160ms ease,background-color 180ms ease,border-color 180ms ease,box-shadow 200ms var(--ease-out),transform 120ms var(--ease-out);
}
.btn.primary{color:#fff;background:var(--deep);border-color:var(--deep)}
.btn:active{transform:scale(.97)}
.pill{border:1px solid var(--line);border-radius:999px;padding:.45rem .72rem;font-size:.76rem;color:var(--muted);background:rgba(255,255,255,.34)}
.badge{font-size:.75rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;padding:.48rem .68rem;border:1px solid rgba(216,103,69,.26);color:#a45136;border-radius:999px;background:rgba(216,103,69,.06)}
.badge.cool{border-color:rgba(79,127,131,.26);color:#386063;background:rgba(79,127,131,.06)}
.badge.neutral{border-color:var(--line-strong);color:var(--muted);background:rgba(255,255,255,.4)}

/* ---------- status labels ---------- */
.state{justify-self:end;font-size:.75rem;padding:.4rem .58rem;border-radius:999px;border:1px solid var(--line);color:var(--muted);white-space:nowrap}
.state.done{color:#2b6d5b;border-color:rgba(43,109,91,.2);background:rgba(43,109,91,.05)}
.state.now{color:#a45136;border-color:rgba(216,103,69,.2);background:rgba(216,103,69,.05)}
.state.hold{color:#6b5a2a;border-color:rgba(160,130,50,.25);background:rgba(200,170,90,.07)}

/* ---------- cards ---------- */
.info-card{min-height:180px;border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:rgba(255,255,255,.34)}
.info-card .num{font-size:.75rem;color:var(--muted);letter-spacing:.1em;font-weight:800;text-transform:uppercase}
.info-card h3{font-size:1.13rem;margin:34px 0 8px;letter-spacing:-.03em}
.info-card p{margin:0;font-size:.89rem;color:var(--muted)}

.note-card{border:1px solid var(--line);border-radius:15px;padding:15px;background:rgba(255,255,255,.35)}
.note-card strong{display:block;font-size:.76rem}
.note-card p{margin:5px 0 0;color:var(--muted);font-size:.78rem}

.analysis-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}
.analysis-card{border:1px solid var(--line);border-radius:20px;padding:20px;background:rgba(255,255,255,.32)}
.analysis-card h3{margin:0 0 8px;font-size:.96rem}
.analysis-card p{margin:0;color:var(--muted);font-size:.8rem}

.callout{margin-top:28px;border-left:2px solid var(--accent);padding:4px 0 4px 18px;color:#425157;font-size:1rem;max-width:720px}
.scientific-note{margin-top:16px;padding:16px 18px;border-left:2px solid var(--cool);background:rgba(79,127,131,.04);font-size:.82rem;color:#526166}
.warning-strip{margin-top:14px;padding:12px 13px;border-left:2px solid var(--accent);background:rgba(216,103,69,.035);font-size:.78rem;color:#635853}

.detail-list{margin:20px 0 0;padding:0;list-style:none;border-top:1px solid var(--line)}
.detail-list li{display:grid;grid-template-columns:170px 1fr;gap:18px;padding:13px 0;border-bottom:1px solid var(--line);font-size:.78rem}
.detail-list b{font-size:.76rem}
.detail-list span{color:var(--muted)}

code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.75rem;color:#385d61;background:rgba(79,127,131,.07);padding:.1em .35em;border-radius:6px}

/* ---------- equations ---------- */
.eq-scroll{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:auto;padding-bottom:5px;overscroll-behavior-inline:contain}
.eq-scroll::-webkit-scrollbar{height:9px}
.eq-scroll::-webkit-scrollbar-thumb{background:rgba(79,127,131,.42);border:2px solid transparent;border-radius:999px;background-clip:padding-box}
.eq-scroll::-webkit-scrollbar-track{background:rgba(20,32,36,.05);border-radius:999px}
.eq{
  margin:18px 0;padding:18px 20px;border:1px solid var(--line);border-radius:16px;
  background:rgba(255,255,255,.42);
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:.86rem;line-height:1.7;color:#20403f;
  white-space:nowrap;
}
.eq sub,.eq sup{font-size:.68em}
.eq .cmt{color:var(--muted);font-family:ui-sans-serif,system-ui,sans-serif;font-size:.75rem;white-space:normal}
.eq-block{margin-top:24px;border-top:1px solid var(--line);padding-top:8px}
.eq-block h3{font-size:1.02rem;margin:18px 0 4px;letter-spacing:-.02em}
.eq-block>p{margin:6px 0 0;color:var(--muted);font-size:.8rem;max-width:760px}

.fraction{text-align:center;font-variant-numeric:tabular-nums}
.numerator,.denominator{padding:13px 10px;font-size:clamp(.9rem,1.5vw,1.1rem);font-weight:780}
.numerator{border-bottom:1px solid var(--ink);color:#8f432f}
.denominator{color:var(--deep)}
.times{font-size:2rem;font-weight:800;letter-spacing:-.05em}

/* ---------- roadmap ---------- */
.roadmap{display:grid;gap:0;margin-top:28px;border-top:1px solid var(--line)}
.roadmap-item{display:grid;grid-template-columns:110px 1fr 150px;align-items:center;gap:20px;padding:19px 0;border-bottom:1px solid var(--line)}
.phase{color:var(--muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.09em;font-weight:800}
.roadmap-item strong{font-size:.92rem}
.roadmap-item em{display:block;font-style:normal;color:var(--muted);font-size:.75rem;margin-top:2px}

/* ---------- footer ---------- */
footer{padding:34px 0 50px;color:var(--muted);font-size:.78rem}
.footer-grid{display:flex;justify-content:space-between;gap:22px;flex-wrap:wrap;align-items:center}
.footer-links{display:flex;gap:16px;flex-wrap:wrap}
.footer-links a{text-decoration:none;min-height:44px;min-width:44px;display:inline-flex;align-items:center}
.provenance-line{margin-top:14px;padding-top:14px;border-top:1px solid var(--line);font-size:.75rem;color:#6f7b7f;max-width:900px}
.inline-link{display:inline-flex;align-items:center;min-height:44px;text-underline-offset:3px}

.read-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:1001;pointer-events:none;background:transparent}
.read-progress span{display:block;width:100%;height:100%;background:linear-gradient(90deg,var(--cool),var(--accent));transform:scaleX(0);transform-origin:left center;will-change:transform}

/* ---------- reveal motion ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 360ms var(--ease-out),transform 420ms var(--ease-out)}
.reveal.is-visible{opacity:1;transform:none}

.sr-only{
  position:absolute!important;width:1px!important;height:1px!important;
  padding:0!important;margin:-1px!important;overflow:hidden!important;
  clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important;
}

/* ---------- responsive ---------- */
@media(max-width:1100px){
  .analysis-grid{grid-template-columns:1fr}
}
@media(max-width:980px){
  .nav-links>a:not(.nav-cta){display:none}
  .nav-links>.nav-cta{display:none}
  .mobile-nav{display:block}
  .hero{padding-top:44px}
  .hero-grid,.section-grid{grid-template-columns:1fr;gap:38px}
  .sticky-title{position:relative;top:auto}
  .detail-list li{grid-template-columns:1fr;gap:4px}
}
@media(max-width:720px){
  .container{width:min(calc(100% - 24px), var(--max))}
  .nav-inner{min-height:62px}
  .brand{font-size:.9rem}
  .mark{width:30px;height:30px}
  .nav-cta{padding:.58rem .8rem}
  .hero{padding:36px 0 40px}
  h1{font-size:clamp(2.65rem,15vw,4.8rem);line-height:.94}
  h2{font-size:clamp(1.9rem,8vw,2.6rem)}
  section{padding:70px 0}
  .hero-actions{display:grid;grid-template-columns:1fr}
  .hero-actions .btn{width:100%}
  .roadmap-item{grid-template-columns:1fr 96px}
  .roadmap-item .phase{grid-column:1/-1}
  .eq{font-size:.78rem;padding:14px}
  .eq-scroll::before{content:"Swipe to read the full equation →";display:block;position:sticky;left:0;width:max-content;margin:0 0 4px;padding:.25rem .45rem;border-radius:999px;background:rgba(79,127,131,.08);color:#386063;font-family:ui-sans-serif,system-ui,sans-serif;font-size:.75rem;font-weight:750}
}
@media(min-width:1600px){
  :root{--max:1380px}
}
@media(min-width:2200px){
  :root{--max:1680px}
  body{font-size:18px}
}
@media(hover:hover) and (pointer:fine){
  .nav-links a:hover{color:var(--ink)}
  .btn:hover{transform:translateY(-1px);box-shadow:0 9px 25px rgba(20,32,36,.06)}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
  .btn:active{transform:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}
@media(prefers-reduced-transparency:reduce){
  .nav{backdrop-filter:none;background:var(--bg)}
}
@media(prefers-contrast:more){
  :root{--line:rgba(20,32,36,.28);--line-strong:rgba(20,32,36,.5);--muted:#455257}
}
@supports (padding:max(0px)){
  .nav{padding-top:env(safe-area-inset-top)}
  .nav-inner,.container{padding-left:max(0px,env(safe-area-inset-left));padding-right:max(0px,env(safe-area-inset-right))}
  body{padding-bottom:env(safe-area-inset-bottom)}
}