/* ==========================================================================
   LAYOUT — page structure: the background canvas, header, scroll sections,
   glass panels, and footer.
   ========================================================================== */

#bg-canvas{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  z-index:0;
  display:block;
}

header{
  position:fixed; top:0; left:0; right:0;
  display:flex; align-items:center; justify-content:space-between;
  padding:24px 32px;
  z-index:100;
}

main{
  position:relative;
  z-index:1;
  max-width:620px;
  margin:0 auto;
  padding:0 24px;
}

section.beat{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
}

.panel{
  background:var(--panel);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border:1px solid var(--wire-soft);
  border-radius:16px;
  padding:40px;
  opacity:0.3;
  transform:translateY(16px);
  transition:opacity 0.8s ease, transform 0.8s ease;
}
.panel.in-view{ opacity:1; transform:translateY(0); }

footer{
  position:relative; z-index:1;
  max-width:620px;
  margin:0 auto;
  padding:32px 24px 64px;
  display:flex;
  justify-content:space-between;
  color:var(--text-dim);
  font-family:var(--font-mono);
  font-size:12px;
}

@media (max-width: 640px){
  .panel{ padding:28px 24px; }
  header{ padding:18px 20px; }
}

@media (prefers-reduced-motion: reduce){
  .panel{ transition-duration:0.001ms; }
}