/* =============================================================
   Discovery — premium layered background.
   Stacks (back→front):
     0. base gradient floor
     1. violet aurora glows (multi-source)
     2. fine grid (etched, masked)
     3. drifting scan glow
     4. corner coordinate marks
     5. grain overlay (top, mix-blend)
   ============================================================= */

.rg-page-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

/* Layer 0 — base floor: deep violet→inky gradient */
.rg-page-bg {
  background:
    radial-gradient(ellipse 120% 80% at 50% -10%, #1a1330 0%, transparent 55%),
    linear-gradient(180deg, #0a0712 0%, #0d0918 60%, #08060f 100%);
}

/* Layer 1 — multi-source violet aurora */
.rg-page-bg::before {
  content: '';
  position: absolute;
  inset: -25%;
  background:
    radial-gradient(ellipse 38% 32% at 12% 8%,  rgba(139, 92, 246, 0.32), transparent 60%),
    radial-gradient(ellipse 32% 26% at 88% 14%, rgba(168, 85, 247, 0.20), transparent 60%),
    radial-gradient(ellipse 28% 24% at 70% 55%, rgba(99, 102, 241, 0.18), transparent 65%),
    radial-gradient(ellipse 50% 40% at 30% 95%, rgba(139, 92, 246, 0.14), transparent 70%),
    radial-gradient(ellipse 25% 22% at 5% 70%,  rgba(56, 189, 248, 0.08),  transparent 65%);
  filter: blur(50px);
  opacity: 0.95;
}

/* Layer 2 — fine grid, etched & masked */
.rg-page-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.028) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.028) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image:
    radial-gradient(ellipse 90% 70% at 50% 30%, black 30%, transparent 95%);
  -webkit-mask-image:
    radial-gradient(ellipse 90% 70% at 50% 30%, black 30%, transparent 95%);
}

/* Layer 3 — drifting scan glow */
.rg-bg-scan {
  position: absolute;
  top: -10%;
  left: -30%;
  width: 70%;
  height: 120%;
  background:
    radial-gradient(ellipse 50% 50% at 50% 50%, rgba(167, 139, 250, 0.14), transparent 70%);
  filter: blur(70px);
  animation: rg-bg-drift 32s ease-in-out infinite;
}
@keyframes rg-bg-drift {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(140%, 25%); }
}

/* Second drifter going the other way */
.rg-bg-scan::after {
  content: '';
  position: absolute;
  top: 30%;
  left: 80%;
  width: 60%;
  height: 80%;
  background: radial-gradient(ellipse 50% 50% at 50% 50%, rgba(99,102,241,0.10), transparent 70%);
  filter: blur(80px);
  animation: rg-bg-drift2 38s ease-in-out infinite;
}
@keyframes rg-bg-drift2 {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(-130%, -20%); }
}

/* Layer 4 — corner coordinate marks */
.rg-bg-corners {
  position: absolute;
  inset: 24px;
  pointer-events: none;
}
.rg-bg-corners > span {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.20em;
  color: rgba(255,255,255,0.22);
  text-transform: uppercase;
}
.rg-bg-corners > span::before,
.rg-bg-corners > span::after {
  content: '';
  position: absolute;
  background: rgba(255,255,255,0.15);
}
.rg-bg-corners .tl { top: 0; left: 0; padding: 8px 0 0 12px; }
.rg-bg-corners .tl::before { top: 0; left: 0; width: 10px; height: 1px; }
.rg-bg-corners .tl::after  { top: 0; left: 0; width: 1px; height: 10px; }

.rg-bg-corners .tr { top: 0; right: 0; padding: 8px 12px 0 0; }
.rg-bg-corners .tr::before { top: 0; right: 0; width: 10px; height: 1px; }
.rg-bg-corners .tr::after  { top: 0; right: 0; width: 1px; height: 10px; }

.rg-bg-corners .bl { bottom: 0; left: 0; padding: 0 0 8px 12px; }
.rg-bg-corners .bl::before { bottom: 0; left: 0; width: 10px; height: 1px; }
.rg-bg-corners .bl::after  { bottom: 0; left: 0; width: 1px; height: 10px; }

.rg-bg-corners .br { bottom: 0; right: 0; padding: 0 12px 8px 0; }
.rg-bg-corners .br::before { bottom: 0; right: 0; width: 10px; height: 1px; }
.rg-bg-corners .br::after  { bottom: 0; right: 0; width: 1px; height: 10px; }

/* Layer 5 — grain overlay */
.rg-bg-grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  mix-blend-mode: overlay;
  opacity: 0.35;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='0.5'/></svg>");
}

/* Top vignette — softens chrome→content seam */
.rg-page-bg .rg-bg-vignette-top {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 200px;
  background: linear-gradient(180deg, rgba(8,6,15,0.65) 0%, transparent 100%);
  pointer-events: none;
}

/* Page content above bg layers */
.im-page { position: relative; z-index: 2; }

/* Hero — glass card + tighter layout */
.rg-hero {
  position: relative;
  isolation: isolate;
  padding: 32px 0 24px;
}
.rg-hero__copy {
  position: relative;
  padding: 4px 4px 4px 0;
}
.rg-hero__copy::before {
  content: '';
  position: absolute;
  inset: -28px -32px -28px -28px;
  z-index: -1;
  background:
    linear-gradient(135deg, rgba(28, 22, 42, 0.72), rgba(20, 16, 32, 0.40));
  border: 1px solid rgba(167, 139, 250, 0.10);
  border-radius: 16px;
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  box-shadow:
    0 24px 60px -20px rgba(139, 92, 246, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

/* Index ribbon */
.rg-index-ribbon {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  margin-bottom: 18px;
  border-radius: 999px;
  background: rgba(20,18,30,0.85);
  border: 1px solid rgba(167,139,250,0.40);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--text-hi);
  box-shadow:
    0 8px 24px rgba(139,92,246,0.22),
    inset 0 1px 0 rgba(255,255,255,0.06);
  width: fit-content;
}
.rg-index-ribbon .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: rg-pulse 2s ease-in-out infinite;
}
@keyframes rg-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.5; transform: scale(1.3); }
}

/* "Forged" stamp */
.rg-forged {
  position: absolute;
  bottom: 16px;
  right: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.35);
}
.rg-forged .bar { width: 24px; height: 1px; background: rgba(255,255,255,0.25); }

/* Light theme adapts */
:root[data-theme="light"] .rg-page-bg {
  background:
    radial-gradient(ellipse 120% 80% at 50% -10%, #ede8f7 0%, transparent 55%),
    linear-gradient(180deg, #f8f5ee 0%, #f3eee5 60%, #ede8dd 100%);
}
:root[data-theme="light"] .rg-page-bg::before {
  opacity: 0.55;
}
:root[data-theme="light"] .rg-page-bg::after {
  background-image:
    linear-gradient(to right, rgba(20,18,30,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20,18,30,0.04) 1px, transparent 1px);
}
:root[data-theme="light"] .rg-bg-corners > span { color: rgba(20,18,30,0.30); }
:root[data-theme="light"] .rg-bg-corners > span::before,
:root[data-theme="light"] .rg-bg-corners > span::after { background: rgba(20,18,30,0.20); }
:root[data-theme="light"] .rg-hero__copy::before {
  background: linear-gradient(135deg, rgba(255,255,255,0.85), rgba(255,255,255,0.55));
  border-color: rgba(167,139,250,0.20);
}
:root[data-theme="light"] .rg-bg-grain { opacity: 0.18; }