/* ============================================================
   ATHENA AI · ATH — v2
   Light page · scroll-scrubbed film
   ============================================================ */
:root{
  --bg:#f7f9fc;
  --mist:#eef2f8;
  --ink:#0c1a23;
  --ink-dim:#5a6f7d;
  --ink-faint:#93a6b2;
  --cy:#0aa6d4;
  --mg:#e0468f;
  --gd:#d18b0a;
  --gr:#0fb37f;
  --vi:#7a5cf0;
  --line:rgba(12,26,35,.10);
  --line2:rgba(12,26,35,.06);
  --max:1180px;
  --r:20px;
  --shadow:0 24px 60px -20px rgba(12,40,60,.18);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--ink);background:var(--bg);
  font-family:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  font-weight:300;line-height:1.68;-webkit-font-smoothing:antialiased;overflow-x:hidden;
}
h1,h2,h3,h4{font-family:'Sora',sans-serif;font-weight:600;line-height:1.14;letter-spacing:-.022em;margin:0}
.mono{font-family:'JetBrains Mono',ui-monospace,monospace}
a{color:inherit;text-decoration:none}
img,video{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 26px}
.kicker{font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--cy)}
.dim{color:var(--ink-dim)} .faint{color:var(--ink-faint)}
.grad{background:linear-gradient(100deg,var(--gr),var(--cy) 38%,var(--vi) 74%,var(--mg));
  -webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- ambient page wash ---------- */
#amb{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;
  background:
    radial-gradient(ellipse 70% 55% at 18% 6%,rgba(10,166,212,.07),transparent 62%),
    radial-gradient(ellipse 60% 50% at 86% 22%,rgba(122,92,240,.06),transparent 60%),
    radial-gradient(ellipse 80% 60% at 50% 104%,rgba(224,70,143,.05),transparent 62%)}
#amb::after{content:'';position:absolute;inset:-20%;opacity:.7;transform:rotate(-17deg);
  mix-blend-mode:multiply;filter:blur(8px);
  background:repeating-linear-gradient(96deg,
    rgba(196,208,226,.16) 0 34px, rgba(255,255,255,0) 34px 48px,
    rgba(200,212,228,.10) 48px 98px, rgba(255,255,255,0) 98px 108px);
  -webkit-mask-image:radial-gradient(ellipse 78% 82% at 22% 4%,#000 0%,transparent 68%);
  mask-image:radial-gradient(ellipse 78% 82% at 22% 4%,#000 0%,transparent 68%);
  animation:rayDrift 28s ease-in-out infinite alternate}
@keyframes rayDrift{from{transform:rotate(-18deg) translateX(-2%)}to{transform:rotate(-15deg) translateX(3%)}}

/* ---------- nav ---------- */
nav{position:fixed;top:0;left:0;right:0;z-index:40;display:flex;align-items:center;justify-content:space-between;
  padding:16px 26px;max-width:var(--max);margin:0 auto;transition:background .3s,backdrop-filter .3s,box-shadow .3s}
nav.solid{background:rgba(255,255,255,.82);backdrop-filter:blur(20px) saturate(1.6);-webkit-backdrop-filter:blur(20px) saturate(1.6);
  max-width:none;border-bottom:1px solid var(--line2);box-shadow:0 6px 24px -18px rgba(12,40,60,.4);
  padding-left:max(26px,calc(50vw - var(--max)/2));padding-right:max(26px,calc(50vw - var(--max)/2))}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:'Sora';font-weight:600;font-size:16px;letter-spacing:-.01em}
.brand img{width:36px;height:36px;flex:0 0 36px;display:block}
.navlinks{display:flex;gap:26px;font-size:13.5px;color:var(--ink-dim)}
.navlinks a{transition:color .2s}.navlinks a:hover,.navlinks a.on{color:var(--cy)}
@media(max-width:900px){.navlinks{display:none}}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:'Sora';font-weight:600;font-size:13px;
  padding:11px 19px;border-radius:100px;border:1px solid transparent;color:#fff;
  background:linear-gradient(115deg,#0aa6d4,#12b6c9 55%,#3fb98f);cursor:pointer;
  transition:transform .18s,box-shadow .18s,opacity .18s;box-shadow:0 8px 22px -10px rgba(10,166,212,.75)}
.btn:hover{transform:translateY(-1px);box-shadow:0 14px 30px -10px rgba(10,166,212,.7)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.btn.ghost{background:rgba(255,255,255,.82);color:var(--ink);border-color:var(--line);box-shadow:none;
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.btn.ghost:hover{border-color:rgba(10,166,212,.4)}
.btn.sm{font-size:12px;padding:8px 15px}

/* ---------- sections ---------- */
section{position:relative;z-index:3}
.pad{padding:112px 0} .pad-sm{padding:76px 0}
.head{max-width:62ch;margin-bottom:52px}
.head h2{font-size:clamp(28px,3.7vw,44px);margin:14px 0 16px;letter-spacing:-.03em}
.head p{color:var(--ink-dim);font-size:16.5px;margin:0}
.card{background:rgba(255,255,255,.92);border:1px solid var(--line2);border-radius:var(--r);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:var(--shadow)}

/* five-layer stack */
.layers{display:grid;gap:1px;background:var(--line2);border:1px solid var(--line2);border-radius:var(--r);
  overflow:hidden;box-shadow:var(--shadow);position:relative}
.layer{background:rgba(255,255,255,.94);padding:26px 30px;display:grid;grid-template-columns:120px 1fr;gap:24px;
  align-items:start;transition:background .25s}
.layer:hover{background:#fff}
.layer .lname{font-family:'JetBrains Mono';font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--lc);padding-top:5px}
.layer h3{font-size:17px;margin-bottom:6px}
.layer p{margin:0;color:var(--ink-dim);font-size:14.5px}
@media(max-width:720px){.layer{grid-template-columns:1fr;gap:8px;padding:22px}}

/* metrics */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.metric{padding:26px 24px;border-radius:16px;background:rgba(255,255,255,.9);border:1px solid var(--line2)}
.metric .n{font-family:'Sora';font-weight:700;font-size:clamp(24px,3vw,34px);letter-spacing:-.03em}
.metric .l{font-family:'JetBrains Mono';font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--ink-faint);margin-top:6px}
@media(max-width:860px){.metrics{grid-template-columns:repeat(2,1fr)}}

/* split */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
@media(max-width:940px){.split{grid-template-columns:1fr;gap:34px}}

/* proof rows */
.proof{display:grid;gap:14px}
.prow{display:grid;grid-template-columns:26px 1fr;gap:16px;align-items:start;
  padding:20px 22px;border-radius:14px;background:rgba(255,255,255,.86);border:1px solid var(--line2)}
.proof.cols{grid-template-columns:repeat(3,1fr);gap:18px}
.proof.cols .prow{align-content:start}
@media(max-width:860px){.proof.cols{grid-template-columns:1fr}}
.prow b{display:block;font-family:'Sora';font-size:15px;font-weight:600;margin-bottom:4px}
.prow p{margin:0;font-size:14px;color:var(--ink-dim)}
.pnum{font-family:'JetBrains Mono';font-size:11px;color:var(--cy);padding-top:4px}

/* footer */
footer{position:relative;z-index:3;border-top:1px solid var(--line2);padding:54px 0 40px;margin-top:40px;
  background:linear-gradient(180deg,rgba(255,255,255,0),rgba(255,255,255,.7))}
.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px}
@media(max-width:820px){.fgrid{grid-template-columns:1fr;gap:26px}}
footer h5{font-family:'JetBrains Mono';font-size:10px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--ink-faint);margin:0 0 12px;font-weight:400}
footer ul{list-style:none;margin:0;padding:0;display:grid;gap:8px;font-size:13.5px;color:var(--ink-dim)}
footer a:hover{color:var(--cy)}
.disclaim{margin-top:38px;padding-top:22px;border-top:1px solid var(--line2);
  font-size:12px;line-height:1.7;color:var(--ink-faint);max-width:80ch}

/* reveals */
[data-rise]{opacity:0;transform:translateY(22px);transition:opacity .8s cubic-bezier(.2,.8,.25,1),transform .8s cubic-bezier(.2,.8,.25,1)}
[data-rise].in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  #amb::after{animation:none}
  [data-rise]{opacity:1;transform:none;transition:none}
}