/* ===========================================================
   ALVNA — Design System
   Dark PCB-inspired palette. Space Grotesk + Inter + IBM Plex Mono.
   =========================================================== */

:root{
  --bg-deep:#0A1420;
  --bg-panel:#0E1B2C;
  --bg-panel-2:#111F33;
  --line:#1F2E45;
  --line-soft:#182234;
  --text-primary:#EAF0F6;
  --text-muted:#8393AA;
  --text-dim:#556075;
  --signal:#5EEAD4;
  --signal-dim:#2A5C55;
  --copper:#E0A458;
  --copper-dim:#5C4526;

  --font-display:'Space Grotesk', sans-serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'IBM Plex Mono', monospace;

  --container: 1180px;
  --radius: 10px;
}

*{box-sizing:border-box; margin:0; padding:0;}

html{scroll-behavior:smooth;}

body{
  background:var(--bg-deep);
  color:var(--text-primary);
  font-family:var(--font-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%; display:block;}

a{color:inherit; text-decoration:none;}

.wrap{
  max-width:var(--container);
  margin:0 auto;
  padding:0 32px;
}

@media (max-width:640px){
  .wrap{padding:0 20px;}
}

/* subtle circuit-grid texture, used as a full-page backdrop */
.grid-texture{
  position:fixed;
  inset:0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size:36px 36px;
  opacity:0.25;
  pointer-events:none;
  z-index:0;
}

section{position:relative; z-index:1;}

/* ---------- Eyebrow / labels ---------- */
.eyebrow{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:0.16em;
  color:var(--signal);
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:16px;
  text-transform:uppercase;
}
.eyebrow::before{
  content:"";
  width:6px; height:6px;
  background:var(--signal);
  border-radius:50%;
  box-shadow:0 0 8px 2px rgba(94,234,212,0.6);
  flex:0 0 auto;
}
.eyebrow.copper{ color:var(--copper); }
.eyebrow.copper::before{ background:var(--copper); box-shadow:0 0 8px 2px rgba(224,164,88,0.6);}

/* ---------- Type ---------- */
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.15;
  letter-spacing:-0.01em;
  color:var(--text-primary);
}
h1{font-size:clamp(34px, 5.5vw, 60px); font-weight:700;}
h2{font-size:clamp(26px, 3.4vw, 38px);}
h3{font-size:19px;}
p{color:var(--text-muted);}
.lede{
  font-size:clamp(16px, 1.6vw, 19px);
  color:var(--text-muted);
  max-width:560px;
  line-height:1.65;
}

.mono{font-family:var(--font-mono);}

/* ---------- Nav ---------- */
header.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(10,20,32,0.86);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:var(--container);
  margin:0 auto;
  padding:18px 32px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.brand{
  font-family:var(--font-display);
  font-weight:700;
  font-size:20px;
  letter-spacing:0.01em;
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:5px;
}
.brand .mark{
  width:9px;height:9px;
  background:var(--signal);
  box-shadow:0 0 8px 2px rgba(94,234,212,0.6);
  transform:rotate(45deg);
  flex:0 0 auto;
}
.brand span.accent{color:var(--signal);}
.brand .logo-img{
  height:30px;
  width:auto;
  display:block;
}
.brand-tagline{
  font-family:var(--font-mono);
  font-size:8.5px;
  font-weight:500;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--text-dim);
  white-space:nowrap;
}

nav.primary-nav{
  display:flex;
  align-items:center;
  gap:36px;
}
nav.primary-nav a{
  font-size:14px;
  color:var(--text-muted);
  transition:color .15s ease;
  position:relative;
}
nav.primary-nav a:hover, nav.primary-nav a:focus-visible{color:var(--text-primary);}
nav.primary-nav a.current{color:var(--text-primary);}
nav.primary-nav a.current::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:-6px;
  height:2px;
  background:var(--signal);
}

.nav-links{display:flex; align-items:center; gap:36px;}

.nav-cta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.04em;
  color:#06110F;
  background:var(--signal);
  padding:10px 18px;
  border-radius:6px;
  white-space:nowrap;
  transition:transform .15s ease, box-shadow .15s ease;
}
.nav-cta:hover{ transform:translateY(-1px); box-shadow:0 6px 20px rgba(94,234,212,0.25); }

.nav-toggle{
  display:none;
  background:none;
  border:1px solid var(--line);
  border-radius:6px;
  width:40px; height:40px;
  color:var(--text-primary);
  font-size:18px;
  cursor:pointer;
}

@media (max-width:860px){
  .brand-tagline{ display:none; }
  .nav-links{
    position:fixed;
    top:66px; left:0; right:0;
    background:var(--bg-panel);
    border-bottom:1px solid var(--line);
    flex-direction:column;
    align-items:flex-start;
    gap:0;
    padding:8px 24px 20px;
    transform:translateY(-8px);
    opacity:0;
    pointer-events:none;
    transition:opacity .18s ease, transform .18s ease;
  }
  .nav-links.open{
    opacity:1; transform:translateY(0); pointer-events:auto;
  }
  .nav-links a{
    width:100%;
    padding:14px 0;
    border-bottom:1px solid var(--line-soft);
  }
  .nav-cta{ margin-top:14px; text-align:center; }
  .nav-toggle{display:block;}
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:0.03em;
  padding:13px 22px;
  border-radius:7px;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  border:1px solid transparent;
  cursor:pointer;
}
.btn-primary{
  background:var(--signal);
  color:#06110F;
}
.btn-primary:hover{ transform:translateY(-1px); box-shadow:0 8px 24px rgba(94,234,212,0.25); }
.btn-ghost{
  border-color:var(--line);
  color:var(--text-primary);
  background:transparent;
}
.btn-ghost:hover{ border-color:var(--signal); color:var(--signal); }

.btn-row{display:flex; gap:14px; flex-wrap:wrap;}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  padding:88px 0 96px;
  overflow:hidden;
}
.hero-media{
  position:relative;
  margin-top:56px;
  border-radius:14px;
  overflow:hidden;
  border:1px solid var(--line);
}
.hero-media img{ width:100%; height:auto; display:block; }
.hero-media::after{
  content:"";
  position:absolute; inset:0;
  background:linear-gradient(0deg, rgba(10,20,32,0.55) 0%, rgba(10,20,32,0) 35%);
  pointer-events:none;
}

/* ---------- Cards / grids ---------- */
.grid-3{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
}
.grid-2{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
}
.card{
  background:var(--bg-panel);
  padding:28px;
}
.card .tag{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:0.1em;
  color:var(--signal);
  margin-bottom:10px;
  text-transform:uppercase;
}
.card h3{margin-bottom:8px;}
.card p{font-size:14.5px;}

@media (max-width:760px){
  .grid-3{grid-template-columns:1fr;}
  .grid-2{grid-template-columns:1fr;}
}

/* ---------- Panel section ---------- */
.panel{
  background:var(--bg-panel);
  border:1px solid var(--line);
  border-radius:14px;
  padding:40px;
}

/* ---------- Full-bleed photo divider ---------- */
.photo-divider{
  position:relative;
  height:420px;
  overflow:hidden;
  display:flex;
  align-items:center;
}
.photo-divider img{
  position:absolute; inset:0;
  width:100%; height:100%; object-fit:cover;
  filter:brightness(0.55) saturate(1.05);
}
.photo-divider .content{
  position:relative;
  z-index:2;
  max-width:520px;
}
.photo-divider::after{
  content:"";
  position:absolute; inset:0;
  background:linear-gradient(90deg, rgba(10,20,32,0.9) 10%, rgba(10,20,32,0.15) 65%);
  z-index:1;
}
@media (max-width:640px){
  .photo-divider{height:auto; padding:64px 0;}
}

/* ---------- Section spacing ---------- */
.section{padding:96px 0;}
.section-tight{padding:64px 0;}
@media (max-width:640px){
  .section{padding:64px 0;}
  .section-tight{padding:44px 0;}
}

.section-head{ margin-bottom:48px; max-width:640px; }

hr.rule{
  border:none;
  height:1px;
  background:var(--line);
  margin:0;
}

/* ---------- Scaling grid signature ---------- */
.scale-signature{
  background:var(--bg-panel);
  border:1px solid var(--line);
  border-radius:14px;
  padding:36px 32px 28px;
}
.scale-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:0.12em;
  color:var(--text-dim);
  margin-bottom:22px;
  text-transform:uppercase;
}
.scale-track{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
}
.scale-stage{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:12px;
  flex:1;
}
.scale-grid{
  display:grid;
  gap:3px;
  width:100%;
  aspect-ratio:1;
}
.dot{background:var(--signal-dim); border-radius:1px;}
.dot.on{background:var(--signal); box-shadow:0 0 4px rgba(94,234,212,0.6);}
.scale-num{font-family:var(--font-mono); font-size:13px; color:var(--text-muted);}
.scale-stage.final .scale-num{color:var(--copper);}
.scale-connector{
  height:1px; flex:0 0 18px;
  background:linear-gradient(90deg, var(--line), var(--text-dim));
  margin-bottom:26px;
}
@media (max-width:640px){
  .scale-track{gap:8px;}
  .scale-connector{flex:0 0 8px;}
}

/* ---------- Perk list ---------- */
.perk-list{
  list-style:none;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px 28px;
}
.perk-list li{
  font-size:14.5px;
  color:var(--text-muted);
  display:flex;
  align-items:flex-start;
  gap:10px;
  line-height:1.5;
}
.perk-list li::before{
  content:"";
  width:6px; height:6px;
  margin-top:7px;
  background:var(--copper);
  flex:0 0 auto;
  transform:rotate(45deg);
}
@media (max-width:600px){
  .perk-list{grid-template-columns:1fr;}
}

/* ---------- CTA band ---------- */
.cta-band{
  background:linear-gradient(135deg, rgba(94,234,212,0.10), rgba(224,164,88,0.06));
  border:1px solid var(--signal-dim);
  border-radius:14px;
  padding:52px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  flex-wrap:wrap;
}
.cta-band h2{margin-bottom:8px;}

/* ---------- Footer ---------- */
footer.site-footer{
  border-top:1px solid var(--line);
  padding:56px 0 40px;
  margin-top:40px;
}
.footer-grid{
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:40px;
  margin-bottom:40px;
}
.footer-col h4{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:0.1em;
  color:var(--text-dim);
  text-transform:uppercase;
  margin-bottom:16px;
  font-weight:500;
}
.footer-col a, .footer-col p{
  display:block;
  font-size:14px;
  color:var(--text-muted);
  margin-bottom:10px;
}
.footer-col a:hover{color:var(--signal);}
.footer-nav-links{
  display:flex;
  flex-wrap:wrap;
  gap:10px 22px;
}
.footer-nav-links a{
  display:inline-block;
  margin-bottom:0;
}
.footer-bottom{
  display:flex;
  justify-content:space-between;
  align-items:center;
  flex-wrap:wrap;
  gap:12px;
  padding-top:24px;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:11.5px;
  color:var(--text-dim);
}

/* ---------- Utility ---------- */
.center{text-align:center; margin-left:auto; margin-right:auto;}
.mt-8{margin-top:8px;} .mt-16{margin-top:16px;} .mt-24{margin-top:24px;}
.mt-32{margin-top:32px;} .mt-48{margin-top:48px;} .mt-64{margin-top:64px;}

/* ---------- Diagram card (light background for vector infographics) ---------- */
.diagram-card{
  background:#F4F6F9;
  border:1px solid var(--line);
  border-radius:14px;
  padding:28px;
}
.diagram-card img{
  border-radius:6px;
  width:100%;
  height:auto;
}

/* ---------- Screenshot frame ---------- */
.screenshot-frame{
  background:var(--bg-panel);
  border:1px solid var(--line);
  border-radius:12px;
  overflow:hidden;
}
.screenshot-frame .chrome{
  display:flex;
  align-items:center;
  gap:6px;
  padding:12px 16px;
  border-bottom:1px solid var(--line);
  background:var(--bg-panel-2);
}
.screenshot-frame .chrome span{
  width:9px; height:9px;
  border-radius:50%;
  background:var(--line);
}
.screenshot-frame img{ display:block; width:100%; height:auto; }

/* ---------- Roadmap badge ---------- */
.roadmap-badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:0.1em;
  color:var(--copper);
  border:1px solid var(--copper-dim);
  padding:6px 12px;
  border-radius:20px;
  text-transform:uppercase;
  margin-bottom:18px;
}
.roadmap-badge::before{
  content:"";
  width:6px; height:6px;
  border-radius:50%;
  background:var(--copper);
}
.reveal{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s ease, transform .6s ease;
}
.reveal.in{opacity:1; transform:translateY(0);}

@media (prefers-reduced-motion: reduce){
  .reveal{opacity:1; transform:none; transition:none;}
  html{scroll-behavior:auto;}
}

/* ---------- Focus states ---------- */
a:focus-visible, button:focus-visible{
  outline:2px solid var(--signal);
  outline-offset:3px;
}