/* ============================================================
   Lens — shared base (design tokens, layout, legal typography)
   Slate Clinical: petrol/teal + cool slate. Light + cool Dark.
   ============================================================ */
:root{
  --slate-0:#FFFFFF; --slate-50:#F6F7F9; --slate-100:#EEF0F3; --slate-150:#E6E9ED;
  --slate-200:#DCE0E6; --slate-300:#C6CCD4; --slate-400:#99A1AC; --slate-500:#6F7782;
  --slate-600:#565E69; --slate-700:#3D444E; --slate-900:#171A1F;
  --petrol-50:#E9F1F0; --petrol-100:#CDE3E0; --petrol-200:#A2CBC7; --petrol-300:#6FACA6;
  --petrol-400:#46938C; --petrol-500:#257A74; --petrol-600:#1C6B66; --petrol-700:#15534F;
  --steel-400:#5E7CA0; --steel-600:#35506F;

  --bg-app:var(--slate-50); --surface:var(--slate-0); --surface-2:var(--slate-50);
  --text-primary:var(--slate-900); --text-secondary:var(--slate-600); --text-tertiary:var(--slate-500);
  --border-subtle:var(--slate-150); --border-default:var(--slate-200);
  --primary:var(--petrol-600); --brand:var(--petrol-500); --accent:var(--petrol-400);
  --grid-line:rgba(28,107,102,.07); --glow:rgba(70,147,140,.16); --chip-bg:var(--slate-100);

  --font-display:"Space Grotesk",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,system-ui,sans-serif;
  --font-sans:"IBM Plex Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,system-ui,sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,monospace;

  --ease-standard:cubic-bezier(.2,0,0,1);
  --ease-decel:cubic-bezier(.05,.7,.1,1);
  --shadow-card:0 1px 2px rgba(15,17,21,.04), 0 12px 32px -12px rgba(15,17,21,.14);
}
@media (prefers-color-scheme: dark){
  :root{
    --bg-app:#14161A; --surface:#1B1E23; --surface-2:#232830;
    --text-primary:#E8EBEF; --text-secondary:#AEB5BF; --text-tertiary:#828A95;
    --border-subtle:#262B32; --border-default:#313742;
    --primary:#4FA39B; --brand:#4FA39B; --accent:#63B4AC;
    --grid-line:rgba(99,180,172,.08); --glow:rgba(79,163,155,.16); --chip-bg:#232830;
    --shadow-card:0 1px 2px rgba(0,0,0,.4), 0 20px 48px -16px rgba(0,0,0,.55);
  }
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-sans); color:var(--text-primary); background:var(--bg-app);
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  min-height:100vh; min-height:100dvh; position:relative; overflow-x:hidden;
}
body::before{
  content:""; position:fixed; inset:0; z-index:-2; pointer-events:none;
  background:
    radial-gradient(120% 80% at 50% -8%, var(--glow), transparent 60%),
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0/64px 64px,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0/64px 64px;
  -webkit-mask-image:radial-gradient(130% 100% at 50% 0%, #000 55%, transparent 100%);
          mask-image:radial-gradient(130% 100% at 50% 0%, #000 55%, transparent 100%);
}
body::after{
  content:""; position:fixed; inset:0; z-index:-1; pointer-events:none; opacity:.28;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");
  mix-blend-mode:soft-light;
}

.wrap{max-width:1000px; margin:0 auto; padding:0 24px}

/* top bar */
header{padding:26px 0 0}
.bar{display:flex; align-items:center; justify-content:space-between}
.brand{display:flex; align-items:center; gap:11px; color:var(--text-primary); text-decoration:none}
.brand svg{color:var(--brand); display:block}
.brand b{font-family:var(--font-display); font-weight:700; font-size:19px; letter-spacing:-.02em}
.tag{
  font-family:var(--font-mono); font-size:11px; letter-spacing:.06em; text-transform:uppercase;
  color:var(--text-tertiary); border:1px solid var(--border-default); border-radius:999px;
  padding:6px 12px; background:var(--surface); text-decoration:none;
}
a.tag:hover{color:var(--primary); border-color:var(--accent)}

/* footer */
footer{border-top:1px solid var(--border-subtle); margin-top:clamp(56px,10vw,96px); padding:26px 0 40px}
.foot{display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:14px;
  color:var(--text-tertiary); font-size:13px}
.foot nav{display:flex; gap:22px; flex-wrap:wrap}
.foot a{color:var(--text-secondary); text-decoration:none}
.foot a:hover{color:var(--primary)}

/* entrance util */
.reveal{opacity:0; transform:translateY(14px); animation:rise .7s var(--ease-decel) forwards}
.d1{animation-delay:.05s}.d2{animation-delay:.15s}.d3{animation-delay:.25s}
.d4{animation-delay:.35s}.d5{animation-delay:.9s}.d6{animation-delay:2s}
@keyframes rise{to{opacity:1; transform:none}}

/* ---------------- legal pages ---------------- */
.legal{max-width:760px; margin:0 auto; padding:clamp(40px,7vw,72px) 0 24px}
.legal .back{
  display:inline-flex; align-items:center; gap:7px; color:var(--text-secondary);
  text-decoration:none; font-size:14px; margin-bottom:28px;
}
.legal .back:hover{color:var(--primary)}
.legal h1{
  font-family:var(--font-display); font-weight:700; letter-spacing:-.025em; line-height:1.05;
  font-size:clamp(32px,5.5vw,46px); margin-bottom:8px;
}
.legal .lede{color:var(--text-tertiary); font-family:var(--font-mono); font-size:13px; letter-spacing:.02em; margin-bottom:36px}
.legal h2{
  font-family:var(--font-display); font-weight:600; letter-spacing:-.01em;
  font-size:20px; margin:38px 0 12px; padding-top:20px; border-top:1px solid var(--border-subtle);
}
.legal h3{font-size:15px; font-weight:600; margin:22px 0 6px; color:var(--text-primary)}
.legal p, .legal li{color:var(--text-secondary); font-size:15.5px; line-height:1.68}
.legal p{margin:0 0 12px}
.legal ul{margin:0 0 12px; padding-left:20px}
.legal li{margin:0 0 6px}
.legal a{color:var(--primary); text-decoration:none; border-bottom:1px solid var(--border-default)}
.legal a:hover{border-color:var(--primary)}
.legal strong{color:var(--text-primary); font-weight:600}
.legal .fill{
  background:var(--chip-bg); border:1px dashed var(--border-strong,var(--border-default));
  border-radius:6px; padding:1px 7px; color:var(--text-primary); font-family:var(--font-mono);
  font-size:.86em; white-space:nowrap;
}
.legal .card{
  background:var(--surface); border:1px solid var(--border-subtle); border-radius:14px;
  padding:20px 22px; margin:0 0 20px; box-shadow:var(--shadow-card);
}
.legal .card p:last-child{margin-bottom:0}

@media (max-width:560px){
  .tag{display:none}
  .foot{flex-direction:column; align-items:flex-start; gap:16px}
}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1; transform:none; animation:none}
}