/* ═══════════════════════════════════════════
   OBSERVATORY — Shared Design System
   ═══════════════════════════════════════════ */

/* ── Reset ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

/* ── Design Tokens ── */
:root{
  --bg:#080A0F;
  --inst-bg:#0D1019;
  --surface:#0D1019;
  --s2:#131724;
  --s3:#191D2E;
  --border:rgba(175,183,225,0.10);
  --border-hi:rgba(175,183,225,0.15);
  --border-acc:rgba(82,168,120,0.30);

  /* 5 epistemic state colors — canonical */
  --st-asserted:#52A878;
  --st-rejected:#B55C6E;
  --st-unknown:#7E849E;
  --st-indeterminate:#D08B2E;
  --st-unsupported:#4E8EC2;

  /* Text — HIGHER CONTRAST than before */
  --text:#f0f2f8;
  --text-sub:#b8bdd4;
  --text-dim:#6e748e;
  --text-inst:#9da3c0;

  --ff-display:'Cormorant Garamond',Georgia,serif;
  --ff-mono:'JetBrains Mono','Courier New',monospace;
  --ff-body:'Source Serif 4',Georgia,serif;
}
/* Base font size: 15px on desktop, 14px on mobile */
html{font-size:16px;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;scroll-behavior:smooth}
body{font-family:var(--ff-body);background:var(--bg);color:var(--text);line-height:1.65;overflow-x:hidden}
::selection{background:rgba(82,168,120,.30);color:#fff}

/* ═══════════════════════════════════════════
   STICKY NAV — present on ALL pages
   ═══════════════════════════════════════════ */
.site-nav{
  position:sticky;top:0;z-index:100;
  display:flex;align-items:center;gap:14px;
  padding:10px 24px;
  background:rgba(8,10,15,0.92);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(175,183,225,0.08);
  font-family:var(--ff-mono);
  flex-shrink:0;
}
.site-nav-logo{
  display:inline-flex;align-items:center;gap:8px;
  text-decoration:none;color:var(--text-sub);
  transition:color .2s;flex-shrink:0;
}
.site-nav-logo:hover{color:var(--st-asserted)}
.site-nav-logo img{width:24px;height:24px;flex-shrink:0}
.site-nav-logo span{
  font-size:13px;font-weight:400;letter-spacing:.10em;text-transform:uppercase;
}
.site-nav-spacer{flex:1}
.site-nav-links{
  display:flex;gap:4px;align-items:center;
}
.site-nav-links a{
  font-size:13px;letter-spacing:.06em;text-transform:uppercase;
  color:var(--text-dim);text-decoration:none;
  padding:4px 10px;border-radius:3px;
  transition:color .2s,background .2s;
}
.site-nav-links a:hover{color:var(--text-sub);background:rgba(255,255,255,0.05)}
.site-nav-links a.active{color:var(--text);background:rgba(255,255,255,0.07)}
.site-nav-sep{
  width:1px;height:16px;background:rgba(175,183,225,0.12);margin:0 4px;
}

/* ── Shared footer ── */
.site-ftr{
  padding:32px 24px;text-align:center;
  font-family:var(--ff-mono);font-size:13px;
  color:var(--text-dim);letter-spacing:.04em;line-height:1.8;
  border-top:1px solid var(--border);
}
.site-ftr a{color:var(--text-sub);text-decoration:none;transition:color .2s}
.site-ftr a:hover{color:var(--st-asserted)}

/* ── Section headings ── */
.section{padding:72px 24px;max-width:940px;margin:0 auto}
.section-title{
  font-family:var(--ff-display);font-size:clamp(30px,4.5vw,46px);font-weight:300;
  letter-spacing:-0.01em;color:var(--text);
  margin-bottom:10px;
}
.section-sub{
  font-family:var(--ff-mono);font-size:14px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--st-asserted);margin-bottom:28px;
  opacity:0.8;
}

/* ── Cards (demos, research) ── */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{
  background:var(--s2);border:1px solid var(--border-hi);border-radius:8px;
  padding:22px;text-decoration:none;color:var(--text);
  transition:border-color .3s,transform .2s,box-shadow .3s;
  display:flex;flex-direction:column;gap:10px;
}
.card:hover{border-color:var(--border-acc);transform:translateY(-3px);box-shadow:0 8px 32px rgba(0,0,0,0.3)}
.card-label{
  font-family:var(--ff-mono);font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--text-dim);
}
.card-title{
  font-family:var(--ff-display);font-size:24px;font-weight:400;
  color:var(--text);line-height:1.3;
}
.card-desc{
  font-family:var(--ff-body);font-size:15px;font-weight:300;
  color:var(--text-sub);line-height:1.65;
}
/* State dots → squares */
.card-states{display:flex;gap:5px;align-items:center}
.card-dot{width:9px;height:9px;border-radius:2px}
.card-meta{
  font-family:var(--ff-mono);font-size:12px;color:var(--text-dim);
  letter-spacing:.06em;margin-top:auto;
}

/* ── Scroll indicator (clickable) ── */
.scroll-hint{
  position:absolute;bottom:24px;left:50%;transform:translateX(-50%);
  font-family:var(--ff-mono);font-size:12px;color:var(--text-sub);
  letter-spacing:.12em;text-transform:uppercase;
  display:flex;flex-direction:column;align-items:center;gap:6px;
  opacity:0;animation:fadeUp .8s 1.5s forwards;
  text-decoration:none;cursor:pointer;
  padding:8px 16px;border-radius:4px;
  transition:color .2s,background .2s;
}
.scroll-hint:hover{color:var(--text);background:rgba(255,255,255,0.04)}
.scroll-hint::after{
  content:'\2193';font-size:18px;color:var(--st-asserted);opacity:0.6;
  animation:scrollBounce 2s ease-in-out infinite;
}
@keyframes scrollBounce{0%,100%{transform:translateY(0);opacity:0.4}50%{transform:translateY(6px);opacity:0.8}}
@keyframes fadeUp{from{opacity:0;transform:translateX(-50%) translateY(8px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}

/* ── Section divider with gradient peek ── */
.section-divider{
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(82,168,120,0.25) 30%,rgba(82,168,120,0.25) 70%,transparent);
}
/* (peek-strip removed — replaced by section-divider with label) */

/* ── Responsive ── */
@media(max-width:900px){
  .card-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  html{font-size:15px}
  .site-nav{padding:8px 16px;gap:8px}
  .site-nav-links a{font-size:12px;padding:3px 7px}
  .site-nav-logo span{font-size:12px}
  .section{padding:48px 16px}
  .card-grid{grid-template-columns:1fr}
}
@media(max-width:500px){
  .site-nav{flex-wrap:wrap;row-gap:0}
  .site-nav-spacer{display:none}
  .site-nav-links{gap:2px}
  .site-nav-links a{font-size:11px;padding:2px 6px}
  .site-nav-sep{display:none}
}

/* ── Noscript ── */
noscript .ns{max-width:600px;margin:80px auto;padding:24px;font-family:var(--ff-body);color:var(--text);text-align:center}
noscript .ns h1{font-family:var(--ff-display);font-size:36px;margin-bottom:16px}
noscript .ns p{font-size:16px;line-height:1.7;color:var(--text-sub);margin-bottom:12px}
noscript .ns a{color:var(--st-asserted)}