/* ============================================================
   XEDIS — xedis.ai
   Two voices: Cormorant Garamond (the faculty line, serif)
               Space Grotesk (the AI line, sans)
   Two threads: gold #c9a24b (faculty) · cyan→violet (AI)
   meeting at the spark.
   ============================================================ */

:root{
  --void:#06080f;          /* page base — deeper than brand navy */
  --ink:#0c1a30;           /* brand dark — panels */
  --ink-2:#101f3a;         /* raised panel */
  --line:#1c2b47;          /* hairlines */
  --gold:#c9a24b;
  --gold-lt:#e8c877;
  --cyan:#3ad6cf;
  --violet:#8a6cf0;
  --cream:#fff6e0;
  --text:#e8ebf2;
  --muted:#9aa7bd;
  --faint:#5d6b84;
  --serif:'Cormorant Garamond', Georgia, serif;
  --sans:'Space Grotesk', -apple-system, sans-serif;
  --w: min(1120px, calc(100% - 48px));
  --ai-grad: linear-gradient(120deg, var(--cyan), var(--violet));
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--void);
  color:var(--text);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:var(--gold);color:var(--void)}

img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}

/* ---------- type roles ---------- */
.eyebrow{
  font-family:var(--sans);
  font-size:11px;
  font-weight:600;
  letter-spacing:.32em;
  text-transform:uppercase;
  color:var(--gold);
}
.eyebrow.ai{
  background:var(--ai-grad);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}
h1,h2,h3,.serif{font-family:var(--serif);font-weight:500;line-height:1.12;letter-spacing:.005em}
h1{font-size:clamp(44px,7vw,88px)}
h2{font-size:clamp(34px,4.6vw,58px)}
h3{font-size:clamp(24px,2.6vw,32px)}
.lede{
  font-size:clamp(17px,1.6vw,20px);
  color:var(--muted);
  max-width:62ch;
}
em.gold{font-style:italic;color:var(--gold-lt)}
.grad-text{
  background:var(--ai-grad);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}

/* ---------- structure ---------- */
.wrap{width:var(--w);margin:0 auto}
section{position:relative;padding:120px 0}
@media(max-width:720px){section{padding:84px 0}}

/* the two threads — signature device.
   Each section boundary carries one hairline:
   gold when the section speaks for faculty,
   gradient when it speaks for the machine,
   both when they meet. */
.thread{height:1px;width:100%;border:0}
.thread.gold{background:linear-gradient(90deg,transparent,var(--gold) 20%,var(--gold) 80%,transparent)}
.thread.ai{background:linear-gradient(90deg,transparent,var(--cyan) 25%,var(--violet) 75%,transparent)}
.thread.both{background:linear-gradient(90deg,transparent,var(--gold) 18%,var(--cream) 50%,var(--violet) 82%,transparent);box-shadow:0 0 24px rgba(232,200,119,.25)}

/* ---------- nav ---------- */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:50;
  backdrop-filter:blur(14px);
  background:rgba(6,8,15,.72);
  border-bottom:1px solid rgba(28,43,71,.6);
}
.nav-in{
  width:var(--w);margin:0 auto;
  display:flex;align-items:center;gap:28px;
  height:64px;
}
.nav-brand{display:flex;align-items:center;gap:10px;margin-right:auto}
.nav-brand svg{width:30px;height:30px}
.nav-brand span{
  font-family:var(--sans);font-weight:600;font-size:16px;letter-spacing:.34em;color:var(--text);
}
.nav a.link{
  font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);
  transition:color .25s;
}
.nav a.link:hover{color:var(--gold-lt)}
.nav a.cta{
  font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--void);background:var(--gold);
  padding:9px 18px;border-radius:2px;font-weight:600;
  transition:background .25s;
}
.nav a.cta:hover{background:var(--gold-lt)}
@media(max-width:860px){.nav a.link{display:none}}

/* ---------- hero ---------- */
.hero{
  min-height:100svh;
  display:grid;place-items:center;
  text-align:center;
  padding:120px 0 80px;
  position:relative;
}
.hero .mark{width:min(150px,30vw);margin:0 auto 40px}
.hero h1{max-width:15ch;margin:0 auto}
.hero .lede{margin:28px auto 0}
.hero .down{
  position:absolute;bottom:34px;left:50%;transform:translateX(-50%);
  color:var(--faint);font-size:11px;letter-spacing:.3em;text-transform:uppercase;
}
.hero .down::after{
  content:"";display:block;width:1px;height:44px;margin:12px auto 0;
  background:linear-gradient(var(--gold),transparent);
  animation:drip 2.4s ease-in-out infinite;
}
@keyframes drip{0%,100%{opacity:.25}50%{opacity:1}}

/* constellation backdrop (learner points, from brand background idea) */
.stars{position:absolute;inset:0;pointer-events:none;opacity:.5}

/* ---------- reveal on scroll ---------- */
.rv{opacity:0;transform:translateY(26px);transition:opacity .8s ease,transform .8s ease}
.rv.in{opacity:1;transform:none}
.rv.d1{transition-delay:.12s}.rv.d2{transition-delay:.24s}.rv.d3{transition-delay:.36s}.rv.d4{transition-delay:.48s}
@media(prefers-reduced-motion:reduce){
  .rv{opacity:1;transform:none;transition:none}
  .hero .down::after{animation:none}
}

/* ---------- story beats (the dinner) ---------- */
.beats{display:grid;gap:64px;max-width:820px;margin:0 auto}
.beat p{
  font-family:var(--serif);
  font-size:clamp(22px,2.6vw,30px);
  line-height:1.5;color:var(--text);
}
.beat p .dim{color:var(--faint)}
.beat .who{margin-top:14px;font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--faint)}

/* ---------- gap cards ---------- */
.grid{display:grid;gap:20px}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.grid.c3,.grid.c4{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.grid.c3,.grid.c4,.grid.c2{grid-template-columns:1fr}}

.card{
  background:var(--ink);
  border:1px solid var(--line);
  border-radius:4px;
  padding:28px 26px;
}
.card h4{font-family:var(--sans);font-size:16px;font-weight:600;letter-spacing:.02em;margin-bottom:10px}
.card p{font-size:14px;color:var(--muted);line-height:1.65}
.card.gold{border-top:2px solid var(--gold)}
.card.ai{border-top:2px solid transparent;border-image:linear-gradient(90deg,var(--cyan),var(--violet)) 1;border-top-width:2px;border-top-style:solid}
.card .k{font-family:var(--serif);font-size:34px;color:var(--gold-lt);line-height:1;margin-bottom:14px}

/* strike-through truth list */
.truths{max-width:760px;margin:0 auto;display:grid;gap:26px}
.truth{
  display:flex;gap:20px;align-items:baseline;
  font-family:var(--serif);font-size:clamp(19px,2.2vw,26px);color:var(--muted);
}
.truth s{color:var(--faint);text-decoration-color:rgba(201,162,75,.7);text-decoration-thickness:1.5px}
.truth b{color:var(--text);font-weight:500}

/* ---------- announcement ---------- */
.announce{
  text-align:center;
  background:
    radial-gradient(60% 50% at 50% 0%, rgba(201,162,75,.10), transparent 70%),
    var(--void);
}
.announce h2{font-size:clamp(40px,6vw,76px);max-width:16ch;margin:26px auto 0}
.announce .rule{
  width:110px;height:1px;margin:34px auto;
  background:linear-gradient(90deg,transparent,var(--gold),transparent);
}
.pedestal{
  max-width:740px;margin:0 auto;
  font-family:var(--serif);
  font-size:clamp(19px,2.1vw,25px);
  line-height:1.6;color:var(--muted);
}
.pedestal b{color:var(--text);font-weight:500}

/* ---------- journey rail ---------- */
.phase{margin-top:84px;text-align:left}
.phase-head{display:flex;align-items:baseline;gap:18px;margin-bottom:8px}
.phase-head .n{font-family:var(--serif);font-size:52px;color:var(--gold);line-height:1}
.phase-head.ai .n{background:var(--ai-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.phase-head h3{font-size:clamp(22px,2.4vw,30px)}
.phase > .lede{margin:6px 0 30px;font-size:15.5px}

/* ---------- inline quote ---------- */
.pull{
  max-width:860px;margin:0 auto;text-align:center;
  font-family:var(--serif);
  font-size:clamp(24px,3.2vw,40px);
  line-height:1.4;
}
.pull .attr{
  display:block;margin-top:22px;
  font-family:var(--sans);font-size:12px;letter-spacing:.24em;text-transform:uppercase;color:var(--faint);
}

/* ---------- lineage timeline ---------- */
.lineage{position:relative;max-width:880px;margin:64px auto 0}
.lineage::before{
  content:"";position:absolute;left:19px;top:6px;bottom:6px;width:1px;
  background:linear-gradient(var(--gold) 0%, var(--cream) 55%, var(--violet) 100%);
  opacity:.7;
}
.era{position:relative;padding:0 0 58px 64px}
.era:last-child{padding-bottom:0}
.era .dot{
  position:absolute;left:12px;top:8px;width:15px;height:15px;border-radius:50%;
  background:var(--void);border:2px solid var(--gold);
}
.era.ai .dot{border-color:var(--violet)}
.era .when{font-size:11px;letter-spacing:.28em;text-transform:uppercase;color:var(--gold);margin-bottom:6px}
.era h3{margin-bottom:10px}
.era p{color:var(--muted);max-width:60ch}
.era .cite{
  margin-top:14px;padding:16px 20px;
  border-left:2px solid var(--gold);
  background:rgba(12,26,48,.6);
  font-family:var(--serif);font-size:17px;font-style:italic;color:var(--text);
}
.era .cite .src{display:block;margin-top:8px;font-family:var(--sans);font-size:11px;font-style:normal;letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.era .cite .src a{color:var(--gold);border-bottom:1px solid rgba(201,162,75,.4)}

/* ---------- four activities loop ---------- */
.loop{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:48px}
@media(max-width:900px){.loop{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.loop{grid-template-columns:1fr}}
.loop .card{position:relative}
.loop .card::after{
  content:"→";position:absolute;right:-16px;top:50%;transform:translateY(-50%);
  color:var(--gold);font-size:18px;
}
.loop .card:last-child::after{content:"⟲";right:12px;top:14px;transform:none;color:var(--violet)}
@media(max-width:900px){.loop .card::after{display:none}}
.loop .tag{font-size:10px;letter-spacing:.26em;text-transform:uppercase;color:var(--gold);margin-bottom:8px}
.loop .card.ai .tag{background:var(--ai-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}

/* ---------- engineering marvel band ---------- */
.dark-band{
  background:var(--ink);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:56px 0}
@media(max-width:720px){.stat-row{grid-template-columns:1fr}}
.stat{
  text-align:center;padding:34px 20px;
  border:1px solid var(--line);border-radius:4px;background:rgba(6,8,15,.5);
}
.stat .v{font-family:var(--serif);font-size:clamp(40px,4.6vw,58px);color:var(--gold-lt);line-height:1}
.stat .v.grad{background:var(--ai-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.stat .l{margin-top:12px;font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}

/* ---------- CTA panel ---------- */
.cta-panel{
  text-align:center;
  background:
    radial-gradient(50% 60% at 50% 100%, rgba(138,108,240,.12), transparent 70%),
    radial-gradient(50% 60% at 50% 0%, rgba(201,162,75,.10), transparent 70%);
}
.cta-panel h2{max-width:18ch;margin:0 auto}
.btn-row{display:flex;gap:16px;justify-content:center;margin-top:40px;flex-wrap:wrap}
.btn{
  font-family:var(--sans);font-size:13px;letter-spacing:.16em;text-transform:uppercase;font-weight:600;
  padding:15px 30px;border-radius:2px;transition:all .25s;
}
.btn.gold{background:var(--gold);color:var(--void)}
.btn.gold:hover{background:var(--gold-lt)}
.btn.ghost{border:1px solid var(--line);color:var(--muted)}
.btn.ghost:hover{border-color:var(--gold);color:var(--gold-lt)}

/* ---------- footer ---------- */
footer{
  border-top:1px solid var(--line);
  padding:64px 0 40px;
  background:var(--ink);
}
.foot{
  width:var(--w);margin:0 auto;
  display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;
}
@media(max-width:760px){.foot{grid-template-columns:1fr}}
.foot .brand svg{width:150px}
.foot .tag{margin-top:16px;font-size:12px;letter-spacing:.24em;text-transform:uppercase;color:var(--faint)}
.foot h5{font-size:11px;letter-spacing:.26em;text-transform:uppercase;color:var(--gold);margin-bottom:16px}
.foot a{display:block;font-size:14px;color:var(--muted);margin-bottom:10px;transition:color .25s}
.foot a:hover{color:var(--gold-lt)}
.foot p{font-size:13px;color:var(--muted);line-height:1.7}
.legal{
  width:var(--w);margin:48px auto 0;padding-top:24px;
  border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:12px;color:var(--faint);
}
.legal a{color:var(--faint)}
.legal a:hover{color:var(--gold-lt)}