:root{
  --bg:#07080c;
  --bg2:#0d0f16;
  --fg:#eef1f7;
  --muted:#9aa3b6;
  --accent:#2fd6ff;
  --accent2:#7c8cff;
  --maxw:1200px;
  --pad:clamp(20px,5vw,64px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--fg);
  font-family:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  line-height:1.55;
  overflow-x:hidden;
}
a{color:var(--accent)}

.skip-link{
  position:absolute;left:-999px;top:0;z-index:1000;
  background:var(--fg);color:#000;padding:10px 16px;border-radius:6px;
}
.skip-link:focus{left:12px;top:12px}

/* --- shared site header / nav --- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:14px clamp(16px,4vw,40px);
  background:linear-gradient(180deg,rgba(6,8,13,.82),rgba(6,8,13,0));
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
}
.site-header .brand{
  display:inline-flex;align-items:baseline;gap:8px;
  font-weight:800;letter-spacing:-.01em;color:var(--fg);
  text-decoration:none;font-size:1.02rem;
}
.site-header .brand .brand-mark{color:var(--accent)}
.site-header .brand .brand-sub{
  font-weight:500;color:var(--muted);font-size:.82rem;letter-spacing:.02em;
}
.site-nav{display:flex;gap:6px;flex-wrap:wrap}
.site-nav a{
  color:var(--muted);text-decoration:none;font-size:.9rem;font-weight:600;
  padding:7px 13px;border-radius:999px;border:1px solid transparent;
  transition:color .15s ease,border-color .15s ease,background .15s ease;
}
.site-nav a:hover{color:var(--fg);border-color:rgba(255,255,255,.14)}
.site-nav a[aria-current="page"]{
  color:var(--fg);background:rgba(47,214,255,.12);
  border-color:rgba(47,214,255,.35);
}
@media (max-width:520px){
  .site-header .brand-sub{display:none}
  .site-nav a{padding:6px 10px;font-size:.82rem}
}

/* --- sticky 3D stage --- */
#stage{
  position:fixed;inset:0;z-index:0;
  background:
    radial-gradient(120% 90% at 70% 10%, #14203a 0%, transparent 55%),
    radial-gradient(140% 120% at 20% 90%, #101528 0%, transparent 60%),
    linear-gradient(180deg,#05060a,#0b0e16 60%,#05060a);
}
#ring-canvas{display:block;width:100%;height:100%}
#stage-fallback{position:absolute;inset:0;display:grid;place-items:center;padding:var(--pad)}
/* the ID rule's display:grid overrides the UA [hidden]{display:none}, so the
   fallback would show OVER the 3D even when WebGL works — respect the attribute */
#stage-fallback[hidden]{display:none}
#stage-fallback img{max-width:min(560px,80vw);height:auto;filter:drop-shadow(0 30px 60px rgba(0,0,0,.6))}

/* loader */
#loader{
  position:absolute;inset:0;display:grid;place-items:center;
  background:var(--bg);transition:opacity .6s ease;text-align:center;
}
#loader.hidden{opacity:0;pointer-events:none}
.loader-ring{
  width:56px;height:56px;border-radius:50%;
  border:3px solid rgba(255,255,255,.12);border-top-color:var(--accent);
  animation:spin 1s linear infinite;margin:0 auto 16px;
}
.loader-text{color:var(--muted);font-size:.9rem;letter-spacing:.02em}
@keyframes spin{to{transform:rotate(360deg)}}

/* --- content over the stage --- */
#content{position:relative;z-index:2}
.scene{
  min-height:100vh;min-height:100svh;
  display:flex;align-items:center;
  padding:var(--pad);
}
.scene .copy{
  max-width:min(46ch,var(--maxw));
  padding:28px 30px;
  background:linear-gradient(180deg,rgba(10,12,20,.66),rgba(10,12,20,.42));
  border:1px solid rgba(255,255,255,.08);
  border-radius:18px;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  box-shadow:0 20px 60px rgba(0,0,0,.35);
}
/* alternate the copy side so the model gets room to move */
.scene:nth-of-type(even) .copy{margin-left:auto}
.scene.hero .copy,.scene.outro .copy{margin:0 auto;text-align:center}
.copy.center{text-align:center}

.eyebrow{
  text-transform:uppercase;letter-spacing:.22em;font-size:.72rem;
  color:var(--accent);margin:0 0 14px;font-weight:600;
}
h1{
  font-size:clamp(2.1rem,6vw,4rem);line-height:1.04;margin:0 0 18px;
  letter-spacing:-.02em;font-weight:800;
}
h2{
  font-size:clamp(1.6rem,3.6vw,2.5rem);line-height:1.1;margin:0 0 14px;
  letter-spacing:-.015em;font-weight:750;
}
.sub{font-size:clamp(1rem,1.6vw,1.2rem);color:#cdd4e4;margin:0 0 8px}
.scene p{color:#c4cbdc}
.spec{list-style:none;padding:0;margin:18px 0 0}
.spec li{
  position:relative;padding-left:22px;margin:8px 0;color:var(--muted);
  font-size:.94rem;
}
.spec li::before{
  content:"";position:absolute;left:0;top:.55em;width:8px;height:8px;
  border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));
}
.fineprint{color:#6c7691;font-size:.8rem;margin-top:22px}

/* scroll hint */
.scroll-hint{margin-top:38px;display:flex;flex-direction:column;align-items:center;gap:10px;color:var(--muted)}
.scroll-hint span{font-size:.78rem;letter-spacing:.12em;text-transform:uppercase}
.scroll-hint .wheel{animation:wheel 1.6s ease-in-out infinite}
.scroll-hint .arrow{animation:bob 1.6s ease-in-out infinite}
@keyframes wheel{0%{transform:translateY(0);opacity:1}70%{transform:translateY(10px);opacity:0}100%{opacity:0}}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(6px)}}

/* --- reduced motion / no-JS accessibility fallback ---
   Without the "js" class (set by app.js once the driver is live) the stage is
   not fixed and scenes simply stack — content is fully readable, no scroll-jack. */
body:not(.js) #stage{position:relative;height:70vh}
body:not(.js) #loader{display:none}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .loader-ring,.scroll-hint .wheel,.scroll-hint .arrow{animation:none}
}

/* mobile: give copy full width, less blur cost */
@media (max-width:720px){
  .scene .copy{max-width:100%;margin:0}
  .scene:nth-of-type(even) .copy{margin:0}
}

/* =========================================================================
   Subpages (use-cases, tech) — lighter static layout, same visual language.
   ========================================================================= */
.subpage{
  background:
    radial-gradient(120% 80% at 80% -10%, #14203a 0%, transparent 55%),
    radial-gradient(120% 90% at 0% 100%, #101528 0%, transparent 60%),
    var(--bg);
  min-height:100vh;
}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
.wrap-narrow{max-width:760px;margin:0 auto;padding:0 var(--pad)}

/* subpage hero */
.page-hero{padding:calc(88px + 4vh) 0 40px;text-align:center}
.page-hero .eyebrow{margin-bottom:16px}
.page-hero h1{font-size:clamp(2rem,5.5vw,3.4rem);margin-bottom:16px}
.page-hero .lede{
  font-size:clamp(1.05rem,1.8vw,1.28rem);color:#cdd4e4;
  max-width:60ch;margin:0 auto;
}
.page-hero .hero-art{
  margin:34px auto 0;max-width:min(420px,72vw);
  filter:drop-shadow(0 30px 60px rgba(0,0,0,.55));
}
.page-hero .hero-art img{width:100%;height:auto;display:block}

/* section rhythm */
.section{padding:26px 0}
.section-lead{padding-top:8px}
.section h2{margin-bottom:10px}
.section .section-intro{color:#c4cbdc;max-width:64ch;margin:0 0 8px}

/* use-case cards */
.cards{
  display:grid;gap:20px;margin:28px 0 8px;
  grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
}
.card{
  background:linear-gradient(180deg,rgba(14,17,26,.72),rgba(12,14,22,.5));
  border:1px solid rgba(255,255,255,.08);border-radius:16px;
  padding:24px 24px 22px;box-shadow:0 16px 44px rgba(0,0,0,.28);
}
.card.lead{
  grid-column:1/-1;
  border-color:rgba(47,214,255,.28);
  background:linear-gradient(180deg,rgba(18,28,42,.72),rgba(12,16,26,.55));
}
.card .tag{
  display:inline-block;text-transform:uppercase;letter-spacing:.16em;
  font-size:.68rem;font-weight:700;color:var(--accent);margin-bottom:10px;
}
.card h3{font-size:1.28rem;line-height:1.2;margin:0 0 12px;font-weight:750}
.card .story{color:#c9d0e0;margin:0 0 14px}
.card .story:last-child{margin-bottom:0}
.card .beat{
  list-style:none;padding:0;margin:14px 0 0;display:grid;gap:10px;
}
.card .beat li{
  position:relative;padding-left:74px;color:#c4cbdc;font-size:.95rem;
  min-height:24px;
}
.card .beat li b{
  position:absolute;left:0;top:0;width:62px;text-align:right;
  font-size:.64rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted);font-weight:700;padding-top:.2em;
}
.card .beat li.solve{color:#eef1f7}
.card .beat li.solve b{color:var(--accent)}

/* differentiator strip */
.diffs{
  display:grid;gap:16px;margin:24px 0 8px;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
}
.diff{
  background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.07);
  border-radius:14px;padding:18px 18px;
}
.diff h4{margin:0 0 6px;font-size:1.02rem;font-weight:700}
.diff p{margin:0;color:var(--muted);font-size:.92rem}

/* spec tables (tech page) */
.spec-block{
  background:linear-gradient(180deg,rgba(14,17,26,.6),rgba(12,14,22,.42));
  border:1px solid rgba(255,255,255,.08);border-radius:16px;
  padding:8px 24px 18px;margin:20px 0;
}
.spec-block > h2{
  font-size:1.4rem;margin:16px 0 4px;
  display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;
}
.spec-block > p{color:#c4cbdc;margin:6px 0 4px;max-width:70ch}
table.spec-table{
  width:100%;border-collapse:collapse;margin:14px 0 6px;font-size:.95rem;
}
table.spec-table th,table.spec-table td{
  text-align:left;vertical-align:top;padding:10px 12px;
  border-bottom:1px solid rgba(255,255,255,.07);
}
table.spec-table th{
  color:var(--muted);font-weight:600;white-space:nowrap;
  width:34%;font-size:.9rem;
}
table.spec-table td{color:#dfe4f0}
table.spec-table tr:last-child th,table.spec-table tr:last-child td{border-bottom:none}

/* provisional badge */
.prov{
  display:inline-block;font-size:.64rem;letter-spacing:.08em;
  text-transform:uppercase;font-weight:700;color:#ffd27a;
  background:rgba(255,190,90,.12);border:1px solid rgba(255,190,90,.32);
  border-radius:999px;padding:2px 9px;vertical-align:middle;
  white-space:nowrap;
}
td .prov,h2 .prov{margin-left:2px}

.callout{
  border-left:3px solid var(--accent);background:rgba(47,214,255,.06);
  border-radius:0 10px 10px 0;padding:14px 18px;margin:22px 0;
  color:#cdd4e4;font-size:.95rem;
}
.callout.warn{border-left-color:#ffbe5a;background:rgba(255,190,90,.07)}

/* inline cross-page CTA */
.cta-row{
  display:flex;gap:14px;flex-wrap:wrap;justify-content:center;
  margin:34px 0 8px;
}
.btn{
  display:inline-block;padding:12px 22px;border-radius:999px;
  font-weight:700;text-decoration:none;font-size:.96rem;
  transition:transform .12s ease,background .15s ease,border-color .15s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{
  background:linear-gradient(135deg,var(--accent),var(--accent2));color:#04121a;
}
.btn-ghost{
  color:var(--fg);border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.03);
}

/* footer */
.site-footer{
  border-top:1px solid rgba(255,255,255,.07);margin-top:40px;
  padding:30px var(--pad) 44px;color:var(--muted);font-size:.85rem;
}
.site-footer .foot-inner{
  max-width:var(--maxw);margin:0 auto;
  display:flex;gap:18px;flex-wrap:wrap;align-items:center;justify-content:space-between;
}
.site-footer nav{display:flex;gap:16px;flex-wrap:wrap}
.site-footer a{color:var(--muted);text-decoration:none}
.site-footer a:hover{color:var(--fg)}
.site-footer .fineprint{color:#6c7691;font-size:.78rem;max-width:60ch;margin:0}

@media (prefers-reduced-motion: reduce){
  .btn:hover{transform:none}
}