/* ============================================================
   Clever H — shared core
   Design system + layout primitives. Theme files set accents.
   Perf rules: animate transform/opacity only, no large blurs,
   no `transition: all`, below-fold sections use content-visibility.
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
*{margin:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  font-size:1rem;line-height:1.65;
  color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video{display:block;max-width:100%}
img,video{height:auto}
button,input,textarea,select{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
ul{list-style:none;padding:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}

/* ---------- neutral scale + type scale ---------- */
:root{
  --n-0:#ffffff;
  --n-25:#fcfcfc;
  --n-50:#f7f7f8;
  --n-100:#f0f0f2;
  --n-200:#e4e4e8;
  --n-300:#d0d0d6;
  --n-400:#a0a0aa;
  --n-500:#71717a;
  --n-600:#52525b;
  --n-700:#3f3f46;
  --n-800:#27272a;
  --n-900:#18181b;
  --n-950:#0d0d0f;

  --font-display:'Outfit',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-body:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;

  --fs-xs:.75rem;
  --fs-sm:.875rem;
  --fs-base:1rem;
  --fs-lg:1.125rem;
  --fs-xl:clamp(1.25rem,1.1rem + .6vw,1.5rem);
  --fs-2xl:clamp(1.6rem,1.35rem + 1.1vw,2.15rem);
  --fs-3xl:clamp(2rem,1.55rem + 2vw,3rem);
  --fs-4xl:clamp(2.5rem,1.7rem + 3.4vw,4.25rem);

  --sp-1:.25rem;--sp-2:.5rem;--sp-3:.75rem;--sp-4:1rem;--sp-5:1.5rem;
  --sp-6:2rem;--sp-7:3rem;--sp-8:4rem;--sp-9:6rem;--sp-10:8rem;

  --r-sm:8px;--r-md:12px;--r-lg:18px;--r-xl:26px;--r-full:999px;

  /* deliberately restrained — the client disliked heavy shadows */
  --ring:inset 0 0 0 1px var(--n-200);
  --lift:0 1px 2px rgba(16,16,20,.04),0 6px 16px -6px rgba(16,16,20,.08);

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:.45s;

  --maxw:1200px;
  --gutter:clamp(1.25rem,4vw,2.5rem);
}

/* ---------- layout ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(4rem,8vw,7.5rem);position:relative}
/* below-the-fold sections skip layout/paint until near viewport */
.section--defer{content-visibility:auto;contain-intrinsic-size:auto 700px}

.stack>*+*{margin-top:var(--sp-4)}
.grid{display:grid;gap:clamp(1rem,2.2vw,1.75rem)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,22rem),1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,18rem),1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(min(100%,14rem),1fr))}

/* ---------- type ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:.5rem;
  font-family:var(--font-body);font-size:var(--fs-xs);
  font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);
}
.eyebrow::before{
  content:"";width:1.5rem;height:1px;background:currentColor;opacity:.5
}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.1;letter-spacing:-.02em;font-weight:600;color:var(--ink-strong)}
h1{font-size:var(--fs-4xl);letter-spacing:-.035em}
h2{font-size:var(--fs-3xl);letter-spacing:-.028em}
h3{font-size:var(--fs-xl)}
h4{font-size:var(--fs-lg)}
.lead{font-size:var(--fs-lg);color:var(--ink-muted);max-width:58ch;line-height:1.6}
.muted{color:var(--ink-muted)}
.section-head{max-width:62ch;margin-bottom:clamp(2.25rem,4vw,3.5rem)}
.section-head .eyebrow{margin-bottom:var(--sp-3)}
.section-head h2+p{margin-top:var(--sp-4)}
.center{margin-inline:auto;text-align:center}
.center .eyebrow::before{display:none}
.center .lead{margin-inline:auto}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  padding:.9rem 1.6rem;border-radius:var(--r-full);
  font-weight:600;font-size:var(--fs-sm);letter-spacing:.01em;
  transition:background-color .22s var(--ease),color .22s var(--ease),
             border-color .22s var(--ease),transform .22s var(--ease);
  white-space:nowrap;
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--accent);color:var(--on-accent)}
.btn--primary:hover{background:var(--accent-dark)}
.btn--ghost{border:1px solid var(--n-300);color:var(--ink-strong)}
.btn--ghost:hover{border-color:var(--ink-strong);background:var(--n-50)}
.btn--onDark{border:1px solid rgba(255,255,255,.35);color:#fff}
.btn--onDark:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.6)}
.btn svg{width:1rem;height:1rem;flex:none}

/* ---------- cards ---------- */
.card{
  background:var(--surface);
  border-radius:var(--r-lg);
  box-shadow:var(--ring);
  padding:clamp(1.35rem,2.4vw,1.9rem);
  transition:box-shadow .28s var(--ease),transform .28s var(--ease);
  height:100%;
}
.card--hover:hover{transform:translateY(-3px);box-shadow:var(--ring),var(--lift)}
.card h3{margin-bottom:var(--sp-2)}
.card p{color:var(--ink-muted);font-size:var(--fs-sm);line-height:1.65}
.card-icon{
  width:2.75rem;height:2.75rem;border-radius:var(--r-md);
  display:grid;place-items:center;margin-bottom:var(--sp-4);
  background:var(--accent-tint);color:var(--accent-dark);
}
.card-icon svg{width:1.35rem;height:1.35rem;stroke-width:1.75}

/* ---------- stat / metric ---------- */
.metric{display:flex;flex-direction:column;gap:.35rem}
.metric-value{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(1.9rem,1.3rem + 2.2vw,2.9rem);
  line-height:1;letter-spacing:-.035em;color:var(--ink-strong);
  font-variant-numeric:tabular-nums;
}
.metric-label{font-size:var(--fs-sm);color:var(--ink-muted);line-height:1.5;max-width:26ch}

/* ---------- header ---------- */
.hdr{
  position:fixed;inset:0 0 auto 0;z-index:100;
  transition:background-color .3s var(--ease),box-shadow .3s var(--ease);
}
.hdr-inner{
  display:flex;align-items:center;justify-content:space-between;gap:var(--sp-5);
  height:var(--hdr-h,76px);
}
.hdr.is-stuck{background:var(--surface-blur);box-shadow:0 1px 0 var(--n-200)}
@supports (backdrop-filter:blur(12px)){
  .hdr.is-stuck{backdrop-filter:blur(12px)}
}
.brand{display:flex;align-items:center;gap:.6rem;font-family:var(--font-display);font-weight:700;font-size:1.15rem;letter-spacing:-.02em}
.nav{display:flex;align-items:center;gap:clamp(1rem,2.2vw,2rem)}
.nav a{font-size:var(--fs-sm);font-weight:500;color:var(--nav-ink);transition:color .2s var(--ease);position:relative;padding-block:.25rem}
.nav a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1.5px;
  background:currentColor;transform:scaleX(0);transform-origin:left;
  transition:transform .25s var(--ease);
}
.nav a:hover,.nav a[aria-current="true"]{color:var(--nav-ink-active)}
.nav a[aria-current="true"]::after,.nav a:hover::after{transform:scaleX(1)}
.hdr-cta{display:flex;align-items:center;gap:var(--sp-3)}
.burger{display:none;width:2.5rem;height:2.5rem;place-items:center;border-radius:var(--r-sm)}
.burger span{display:block;width:20px;height:1.5px;background:currentColor;transition:transform .28s var(--ease),opacity .2s var(--ease)}
.burger span+span{margin-top:5px}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

@media (max-width:900px){
  .nav{
    position:fixed;inset:var(--hdr-h,76px) 0 auto 0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--surface);padding:var(--sp-4) var(--gutter) var(--sp-6);
    box-shadow:0 1px 0 var(--n-200);
    transform:translateY(-8px);opacity:0;pointer-events:none;
    transition:transform .3s var(--ease),opacity .3s var(--ease);
  }
  .nav.is-open{transform:none;opacity:1;pointer-events:auto}
  .nav a{padding-block:.85rem;border-bottom:1px solid var(--n-100);color:var(--ink-strong)}
  .nav a::after{display:none}
  .burger{display:grid}
  .hdr-cta .btn{display:none}
}

/* ---------- logo strip ---------- */
.logos{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:clamp(1.5rem,4vw,3.25rem)}
.logos img{
  height:clamp(1.6rem,3.2vw,2.3rem);width:auto;
  opacity:.55;filter:grayscale(1);
  transition:opacity .25s var(--ease),filter .25s var(--ease);
}
.logos img:hover{opacity:1;filter:grayscale(0)}

/* ---------- footer ---------- */
.ftr{background:var(--n-950);color:var(--n-400);padding-block:var(--sp-8) var(--sp-6)}
.ftr a{transition:color .2s var(--ease)}
.ftr a:hover{color:#fff}
.ftr h4{color:#fff;font-size:var(--fs-sm);letter-spacing:.1em;text-transform:uppercase;font-weight:600;margin-bottom:var(--sp-4)}
.ftr-grid{display:grid;gap:var(--sp-6);grid-template-columns:repeat(auto-fit,minmax(min(100%,13rem),1fr))}
.ftr-bottom{
  margin-top:var(--sp-7);padding-top:var(--sp-5);
  border-top:1px solid rgba(255,255,255,.1);
  display:flex;flex-wrap:wrap;gap:var(--sp-3);justify-content:space-between;
  font-size:var(--fs-xs);
}

/* ---------- reveal (IntersectionObserver driven) ---------- */
.reveal{opacity:0;transform:translate3d(0,18px,0);will-change:opacity,transform}
.reveal.is-in{opacity:1;transform:none;transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.is-in{will-change:auto}
[data-stagger]>*{opacity:0;transform:translate3d(0,16px,0)}
[data-stagger].is-in>*{opacity:1;transform:none;transition:opacity .55s var(--ease),transform .55s var(--ease)}
[data-stagger].is-in>*:nth-child(1){transition-delay:0ms}
[data-stagger].is-in>*:nth-child(2){transition-delay:70ms}
[data-stagger].is-in>*:nth-child(3){transition-delay:140ms}
[data-stagger].is-in>*:nth-child(4){transition-delay:210ms}
[data-stagger].is-in>*:nth-child(5){transition-delay:280ms}
[data-stagger].is-in>*:nth-child(6){transition-delay:350ms}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
  .reveal,[data-stagger]>*{opacity:1;transform:none}
}

/* ---------- utilities ---------- */
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:var(--gutter);top:-4rem;z-index:200;background:var(--accent);color:var(--on-accent);padding:.65rem 1.1rem;border-radius:var(--r-sm);transition:top .2s var(--ease)}
.skip:focus{top:.75rem}