/* ==========================================================================
   NEXUS OS — GLASSMORPHISM DEEP SYSTEM
   Multi-layered frosted glass rendering engine
   Thick neon glass with reflections, edge lighting, and depth
   Depends on: themes/*.css for --nexus-* custom properties
   ========================================================================== */

@layer glass-system;

@layer glass-system {

/* ==========================================================================
   §1  GLASS FOUNDATIONS — Core Properties & SVG Filters
   ========================================================================== */

:root {
  /* ── Glass Depth Scale ──
     Five depth layers from thin/shallow to thick/heavy.
     Higher depth = more blur, more opacity, stronger glow. */
  --glass-depth-1-blur: 8px;
  --glass-depth-1-opacity: 0.3;
  --glass-depth-1-border: 0.1;
  --glass-depth-1-saturation: 1.2;

  --glass-depth-2-blur: 14px;
  --glass-depth-2-opacity: 0.45;
  --glass-depth-2-border: 0.18;
  --glass-depth-2-saturation: 1.3;

  --glass-depth-3-blur: 20px;
  --glass-depth-3-opacity: 0.6;
  --glass-depth-3-border: 0.25;
  --glass-depth-3-saturation: 1.4;

  --glass-depth-4-blur: 30px;
  --glass-depth-4-opacity: 0.72;
  --glass-depth-4-border: 0.35;
  --glass-depth-4-saturation: 1.5;

  --glass-depth-5-blur: 40px;
  --glass-depth-5-opacity: 0.82;
  --glass-depth-5-border: 0.45;
  --glass-depth-5-saturation: 1.6;

  /* ── Glass Reflection ── */
  --glass-reflection-angle: 135deg;
  --glass-reflection-intensity: 0.06;
  --glass-reflection-width: 40%;

  /* ── Edge Lighting ── */
  --glass-edge-light-intensity: 0.08;
  --glass-edge-light-color: rgba(255, 255, 255, var(--glass-edge-light-intensity));
  --glass-edge-shadow-color: rgba(0, 0, 0, 0.25);

  /* ── Inner Shadow ── */
  --glass-inner-shadow: inset 0 1px 1px rgba(255,255,255,0.05), inset 0 -1px 1px rgba(0,0,0,0.2);
  --glass-inner-shadow-strong: inset 0 2px 2px rgba(255,255,255,0.08), inset 0 -2px 2px rgba(0,0,0,0.3);

  /* ── Noise ── */
  --glass-noise-opacity: 0.03;
  --glass-noise-size: 200px;

  /* ── Transitions ── */
  --glass-transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --glass-transition-appear: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}


/* ==========================================================================
   §2  GLASS DEPTH LAYERS
   Each depth level: backdrop-filter, background, border, shadow, reflection
   and noise overlay via pseudo-elements.
   ========================================================================== */

/* ── Depth 1: Thin / Shallow ──
   Use for: subtle overlays, tooltips, background panels */
.glass-depth-1 {
  position: relative;
  backdrop-filter: blur(var(--glass-depth-1-blur)) saturate(var(--glass-depth-1-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-1-blur)) saturate(var(--glass-depth-1-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-1-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-1-border));
  border-radius: var(--nexus-radius);
  box-shadow: var(--nexus-shadow-inset);
  overflow: hidden;
  transition: all var(--glass-transition);
}

.glass-depth-1::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    var(--glass-reflection-angle),
    rgba(255, 255, 255, var(--glass-reflection-intensity)) 0%,
    transparent var(--glass-reflection-width)
  );
  pointer-events: none;
  z-index: 1;
}

.glass-depth-1::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image: var(--nexus-noise);
  background-repeat: repeat;
  background-size: var(--glass-noise-size) var(--glass-noise-size);
  opacity: var(--glass-noise-opacity);
  pointer-events: none;
  z-index: 2;
}

.glass-depth-1:hover {
  background: rgba(25, 0, 12, calc(var(--glass-depth-1-opacity) + 0.08));
  border-color: rgba(255, 20, 80, calc(var(--glass-depth-1-border) + 0.08));
}

.glass-depth-1--bordered {
  border-width: var(--nexus-border-width-thick);
}

.glass-depth-1--glowing {
  box-shadow: var(--nexus-shadow-neon-subtle), var(--nexus-shadow-inset);
}

.glass-depth-1--textured::after {
  opacity: calc(var(--glass-noise-opacity) * 2);
}

.glass-depth-1--reflective::before {
  --glass-reflection-intensity: 0.12;
}

/* ── Depth 2: Medium ──
   Use for: cards, toolbars, standard panels */
.glass-depth-2 {
  position: relative;
  backdrop-filter: blur(var(--glass-depth-2-blur)) saturate(var(--glass-depth-2-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-2-blur)) saturate(var(--glass-depth-2-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-2-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-2-border));
  border-radius: var(--nexus-radius);
  box-shadow:
    0 4px 16px rgba(0,0,0,0.3),
    var(--nexus-shadow-inset);
  overflow: hidden;
  transition: all var(--glass-transition);
}

.glass-depth-2::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    var(--glass-reflection-angle),
    rgba(255, 255, 255, calc(var(--glass-reflection-intensity) * 1.2)) 0%,
    transparent var(--glass-reflection-width)
  );
  pointer-events: none;
  z-index: 1;
}

.glass-depth-2::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image: var(--nexus-noise);
  background-repeat: repeat;
  background-size: var(--glass-noise-size) var(--glass-noise-size);
  opacity: var(--glass-noise-opacity);
  pointer-events: none;
  z-index: 2;
}

.glass-depth-2:hover {
  background: rgba(25, 0, 12, calc(var(--glass-depth-2-opacity) + 0.06));
  border-color: rgba(255, 20, 80, calc(var(--glass-depth-2-border) + 0.1));
  box-shadow:
    0 6px 20px rgba(0,0,0,0.35),
    var(--nexus-shadow-neon-subtle),
    var(--nexus-shadow-inset);
}

.glass-depth-2:focus-within,
.glass-depth-2--active {
  border-color: rgba(255, 20, 80, calc(var(--glass-depth-2-border) + 0.2));
  box-shadow:
    0 6px 24px rgba(0,0,0,0.4),
    var(--nexus-shadow-neon-subtle),
    inset 0 0 20px rgba(255, 0, 60, 0.03),
    var(--nexus-shadow-inset);
}

.glass-depth-2--bordered { border-width: var(--nexus-border-width-thick); }

.glass-depth-2--glowing {
  box-shadow: 0 4px 16px rgba(0,0,0,0.3), var(--nexus-shadow-neon-subtle), var(--nexus-shadow-inset);
}

.glass-depth-2--textured::after { opacity: calc(var(--glass-noise-opacity) * 2.5); }

.glass-depth-2--reflective::before {
  background: linear-gradient(
    var(--glass-reflection-angle),
    rgba(255, 255, 255, 0.12) 0%,
    rgba(255, 255, 255, 0.04) 20%,
    transparent 50%
  );
}

/* ── Depth 3: Standard ──
   Use for: sidebars, primary panels, windows */
.glass-depth-3 {
  position: relative;
  backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-3-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-3-border));
  border-radius: var(--nexus-radius);
  box-shadow:
    0 8px 32px rgba(0,0,0,0.4),
    var(--nexus-shadow-neon-subtle),
    var(--nexus-shadow-inset);
  overflow: hidden;
  transition: all var(--glass-transition);
}

.glass-depth-3::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    var(--glass-reflection-angle),
    rgba(255, 255, 255, calc(var(--glass-reflection-intensity) * 1.5)) 0%,
    rgba(255, 255, 255, 0.02) 25%,
    transparent 50%
  );
  pointer-events: none;
  z-index: 1;
}

.glass-depth-3::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image: var(--nexus-noise);
  background-repeat: repeat;
  background-size: var(--glass-noise-size) var(--glass-noise-size);
  opacity: var(--glass-noise-opacity);
  pointer-events: none;
  z-index: 2;
}

.glass-depth-3:hover {
  background: rgba(25, 0, 12, calc(var(--glass-depth-3-opacity) + 0.05));
  border-color: rgba(255, 20, 80, calc(var(--glass-depth-3-border) + 0.12));
  box-shadow:
    0 10px 40px rgba(0,0,0,0.45),
    var(--nexus-shadow-neon),
    var(--nexus-shadow-inset);
}

.glass-depth-3:focus-within,
.glass-depth-3--active {
  border-color: rgba(255, 20, 80, calc(var(--glass-depth-3-border) + 0.25));
  box-shadow:
    0 10px 40px rgba(0,0,0,0.45),
    var(--nexus-shadow-neon),
    inset 0 0 30px rgba(255, 0, 60, 0.05),
    var(--nexus-shadow-inset);
}

.glass-depth-3--bordered { border-width: var(--nexus-border-width-thick); }

.glass-depth-3--glowing {
  box-shadow: 0 8px 32px rgba(0,0,0,0.4), var(--nexus-shadow-neon), var(--nexus-shadow-inset);
}

.glass-depth-3--textured::after { opacity: calc(var(--glass-noise-opacity) * 3); }

.glass-depth-3--reflective::before {
  background: linear-gradient(
    var(--glass-reflection-angle),
    rgba(255, 255, 255, 0.15) 0%,
    rgba(255, 255, 255, 0.06) 20%,
    transparent 45%
  );
}

/* ── Depth 4: Heavy ──
   Use for: dropdowns, popovers, floating elements */
.glass-depth-4 {
  position: relative;
  backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-4-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-4-border));
  border-radius: var(--nexus-radius);
  box-shadow:
    0 12px 48px rgba(0,0,0,0.5),
    var(--nexus-shadow-neon),
    var(--nexus-shadow-inset);
  overflow: hidden;
  transition: all var(--glass-transition);
}

.glass-depth-4::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    var(--glass-reflection-angle),
    rgba(255, 255, 255, 0.08) 0%,
    rgba(255, 255, 255, 0.03) 20%,
    transparent 45%
  );
  pointer-events: none;
  z-index: 1;
}

.glass-depth-4::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image: var(--nexus-noise);
  background-repeat: repeat;
  background-size: var(--glass-noise-size) var(--glass-noise-size);
  opacity: var(--glass-noise-opacity);
  pointer-events: none;
  z-index: 2;
}

.glass-depth-4:hover {
  border-color: rgba(255, 20, 80, calc(var(--glass-depth-4-border) + 0.15));
  box-shadow:
    0 16px 56px rgba(0,0,0,0.55),
    var(--nexus-shadow-neon-strong),
    var(--nexus-shadow-inset);
}

.glass-depth-4--bordered { border-width: var(--nexus-border-width-thick); }
.glass-depth-4--glowing { box-shadow: 0 12px 48px rgba(0,0,0,0.5), var(--nexus-shadow-neon-strong), var(--nexus-shadow-inset); }
.glass-depth-4--textured::after { opacity: calc(var(--glass-noise-opacity) * 3.5); }

/* ── Depth 5: Maximum ──
   Use for: modals, critical overlays, primary focus areas */
.glass-depth-5 {
  position: relative;
  backdrop-filter: blur(var(--glass-depth-5-blur)) saturate(var(--glass-depth-5-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-5-blur)) saturate(var(--glass-depth-5-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-5-opacity));
  border: var(--nexus-border-width-thick) solid rgba(255, 20, 80, var(--glass-depth-5-border));
  border-radius: var(--nexus-radius-lg);
  box-shadow:
    0 16px 64px rgba(0,0,0,0.6),
    var(--nexus-shadow-neon-strong),
    var(--glass-inner-shadow-strong);
  overflow: hidden;
  transition: all var(--glass-transition);
}

.glass-depth-5::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    var(--glass-reflection-angle),
    rgba(255, 255, 255, 0.1) 0%,
    rgba(255, 255, 255, 0.04) 18%,
    transparent 40%
  );
  pointer-events: none;
  z-index: 1;
}

.glass-depth-5::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image: var(--nexus-noise);
  background-repeat: repeat;
  background-size: var(--glass-noise-size) var(--glass-noise-size);
  opacity: calc(var(--glass-noise-opacity) * 0.8);
  pointer-events: none;
  z-index: 2;
}

.glass-depth-5:hover {
  box-shadow:
    0 20px 72px rgba(0,0,0,0.65),
    0 0 40px var(--nexus-neon-glow),
    0 0 80px var(--nexus-neon-glow-soft),
    var(--glass-inner-shadow-strong);
}

.glass-depth-5--bordered { border-width: 3px; }
.glass-depth-5--glowing {
  box-shadow:
    0 16px 64px rgba(0,0,0,0.6),
    0 0 40px var(--nexus-neon-glow),
    0 0 80px var(--nexus-neon-glow-soft),
    var(--glass-inner-shadow-strong);
}
.glass-depth-5--textured::after { opacity: calc(var(--glass-noise-opacity) * 4); }

/* ── Disabled state for all depths ── */
.glass-depth-1--disabled,
.glass-depth-2--disabled,
.glass-depth-3--disabled,
.glass-depth-4--disabled,
.glass-depth-5--disabled {
  filter: saturate(0.2) brightness(0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  pointer-events: none;
  cursor: not-allowed;
}

.glass-depth-1--disabled::before,
.glass-depth-2--disabled::before,
.glass-depth-3--disabled::before,
.glass-depth-4--disabled::before,
.glass-depth-5--disabled::before {
  opacity: 0;
}


/* ==========================================================================
   §3  GLASS REFLECTIONS
   Simulated light reflections using gradient pseudo-elements
   ========================================================================== */

/* ── Base reflection ── */
.glass-reflect {
  position: relative;
}

.glass-reflect::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  z-index: 1;
}

/* ── Top-left light source (most natural, default) ── */
.glass-reflect--top-left::before {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.08) 0%,
    rgba(255, 255, 255, 0.03) 15%,
    transparent 40%
  );
}

/* ── Top-right light source ── */
.glass-reflect--top-right::before {
  background: linear-gradient(
    225deg,
    rgba(255, 255, 255, 0.08) 0%,
    rgba(255, 255, 255, 0.03) 15%,
    transparent 40%
  );
}

/* ── Top center light ── */
.glass-reflect--top::before {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.08) 0%,
    rgba(255, 255, 255, 0.02) 20%,
    transparent 45%
  );
}

/* ── Subtle reflection ── */
.glass-reflect--subtle::before {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.04) 0%,
    transparent 30%
  );
}

/* ── Strong reflection ── */
.glass-reflect--strong::before {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.14) 0%,
    rgba(255, 255, 255, 0.06) 12%,
    rgba(255, 255, 255, 0.02) 25%,
    transparent 45%
  );
}

/* ── Strip reflection (narrow light bar) ── */
.glass-reflect--strip::before {
  background: linear-gradient(
    135deg,
    transparent 20%,
    rgba(255, 255, 255, 0.06) 25%,
    rgba(255, 255, 255, 0.1) 28%,
    rgba(255, 255, 255, 0.06) 31%,
    transparent 36%
  );
}

/* ── Diagonal streak ── */
.glass-reflect--diagonal::before {
  background: linear-gradient(
    120deg,
    transparent 30%,
    rgba(255, 255, 255, 0.04) 40%,
    rgba(255, 255, 255, 0.08) 45%,
    rgba(255, 255, 255, 0.04) 50%,
    transparent 60%
  );
}

/* ── Curved reflection (using radial gradient) ── */
.glass-reflect--curved::before {
  background: radial-gradient(
    ellipse at 30% -10%,
    rgba(255, 255, 255, 0.1) 0%,
    rgba(255, 255, 255, 0.03) 25%,
    transparent 55%
  );
}


/* ==========================================================================
   §4  GLASS EDGE LIGHTING
   Subtle light on edges to simulate 3D glass with light source
   ========================================================================== */

/* ── Base edge light (top + left) ── */
.glass-edge-light {
  border-top: 1px solid var(--glass-edge-light-color);
  border-left: 1px solid rgba(255, 255, 255, calc(var(--glass-edge-light-intensity) * 0.6));
}

/* ── Individual edges ── */
.glass-edge-light--top {
  border-top: 1px solid var(--glass-edge-light-color);
}

.glass-edge-light--left {
  border-left: 1px solid rgba(255, 255, 255, calc(var(--glass-edge-light-intensity) * 0.7));
}

.glass-edge-light--right {
  border-right: 1px solid rgba(255, 255, 255, calc(var(--glass-edge-light-intensity) * 0.4));
}

.glass-edge-light--bottom {
  border-bottom: 1px solid rgba(255, 255, 255, calc(var(--glass-edge-light-intensity) * 0.3));
}

/* ── All edges ── */
.glass-edge-light--all {
  border: 1px solid var(--glass-edge-light-color);
}

/* ── Strong edge light ── */
.glass-edge-light--strong {
  --glass-edge-light-intensity: 0.15;
}

.glass-edge-light--strong.glass-edge-light--top {
  border-top-color: rgba(255, 255, 255, 0.15);
}

/* ── Edge shadow (opposite edges, for depth) ── */
.glass-edge-shadow {
  border-bottom: 1px solid var(--glass-edge-shadow-color);
  border-right: 1px solid rgba(0, 0, 0, 0.15);
}

.glass-edge-shadow--bottom {
  border-bottom: 1px solid var(--glass-edge-shadow-color);
}

.glass-edge-shadow--right {
  border-right: 1px solid rgba(0, 0, 0, 0.15);
}

/* ── Neon edge glow ── */
.glass-edge-glow {
  position: relative;
}

.glass-edge-glow::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  pointer-events: none;
}

.glass-edge-glow--top::after {
  border-top: 1px solid var(--nexus-neon-primary);
  box-shadow: 0 -2px 10px var(--nexus-neon-glow-soft);
  /* Only show top portion */
  clip-path: polygon(0 0, 100% 0, 100% 3px, 0 3px);
}

.glass-edge-glow--bottom::after {
  border-bottom: 1px solid var(--nexus-neon-primary);
  box-shadow: 0 2px 10px var(--nexus-neon-glow-soft);
  clip-path: polygon(0 calc(100% - 3px), 100% calc(100% - 3px), 100% 100%, 0 100%);
}

.glass-edge-glow--left::after {
  border-left: 1px solid var(--nexus-neon-primary);
  box-shadow: -2px 0 10px var(--nexus-neon-glow-soft);
  clip-path: polygon(0 0, 3px 0, 3px 100%, 0 100%);
}

.glass-edge-glow--right::after {
  border-right: 1px solid var(--nexus-neon-primary);
  box-shadow: 2px 0 10px var(--nexus-neon-glow-soft);
  clip-path: polygon(calc(100% - 3px) 0, 100% 0, 100% 100%, calc(100% - 3px) 100%);
}

.glass-edge-glow--all::after {
  border: 1px solid var(--nexus-neon-primary);
  box-shadow:
    0 0 10px var(--nexus-neon-glow-soft),
    inset 0 0 10px var(--nexus-neon-glow-soft);
  clip-path: none;
}


/* ==========================================================================
   §5  GLASS INNER EFFECTS
   Inner shadows, glows, and gradients for depth perception
   ========================================================================== */

/* ── Default inner shadow ── */
.glass-inner-shadow {
  box-shadow: var(--glass-inner-shadow);
}

/* ── Raised inner shadow ── */
.glass-inner-shadow--raised {
  box-shadow:
    inset 0 2px 4px rgba(255, 255, 255, 0.06),
    inset 0 -2px 4px rgba(0, 0, 0, 0.3);
}

/* ── Inset (recessed) ── */
.glass-inner-shadow--inset {
  box-shadow:
    inset 0 3px 8px rgba(0, 0, 0, 0.4),
    inset 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* ── Inner glow (neon colored) ── */
.glass-inner-glow {
  box-shadow: inset 0 0 30px rgba(255, 0, 60, 0.04);
}

.glass-inner-glow--primary {
  box-shadow: inset 0 0 30px rgba(255, 0, 60, 0.05);
}

.glass-inner-glow--secondary {
  box-shadow: inset 0 0 30px rgba(255, 32, 96, 0.05);
}

.glass-inner-glow--accent {
  box-shadow: inset 0 0 30px rgba(255, 0, 102, 0.05);
}

/* ── Intensity variants ── */
.glass-inner-glow--subtle {
  box-shadow: inset 0 0 20px rgba(255, 0, 60, 0.02);
}

.glass-inner-glow--strong {
  box-shadow: inset 0 0 50px rgba(255, 0, 60, 0.08), inset 0 0 100px rgba(255, 0, 60, 0.03);
}

/* ── Inner gradient overlay ── */
.glass-inner-gradient {
  position: relative;
}

.glass-inner-gradient::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.03) 0%,
    transparent 30%,
    transparent 70%,
    rgba(0, 0, 0, 0.05) 100%
  );
  pointer-events: none;
  z-index: 1;
}


/* ==========================================================================
   §6  GLASS NOISE TEXTURE
   Frosted grain effect using SVG noise or CSS gradient approximation
   ========================================================================== */

/* ── Base noise overlay ── */
.glass-noise {
  position: relative;
}

.glass-noise::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image: var(--nexus-noise);
  background-repeat: repeat;
  background-size: var(--glass-noise-size) var(--glass-noise-size);
  opacity: var(--glass-noise-opacity);
  pointer-events: none;
  z-index: 3;
  mix-blend-mode: overlay;
}

/* ── Intensity variants ── */
.glass-noise--subtle::after {
  opacity: calc(var(--glass-noise-opacity) * 0.5);
}

.glass-noise--strong::after {
  opacity: calc(var(--glass-noise-opacity) * 3);
}

/* ── Frequency variants ── */
.glass-noise--fine::after {
  background-size: 100px 100px;
}

.glass-noise--coarse::after {
  background-size: 400px 400px;
  opacity: calc(var(--glass-noise-opacity) * 1.5);
}


/* ==========================================================================
   §7  GLASS ELEMENT TYPES
   Pre-composed glass styles for specific UI element categories
   ========================================================================== */

/* ── Glass Window ──
   Application window with titlebar, body, and statusbar */
.glass-window {
  position: relative;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-3-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-3-border));
  border-radius: var(--nexus-radius-lg);
  box-shadow:
    0 12px 48px rgba(0,0,0,0.5),
    var(--nexus-shadow-neon-subtle),
    var(--glass-inner-shadow);
  overflow: hidden;
  transition: all var(--glass-transition);
}

/* Reflection overlay */
.glass-window::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 35%);
  pointer-events: none;
  z-index: 5;
}

.glass-window__titlebar {
  display: flex;
  align-items: center;
  padding: var(--nexus-space-sm) var(--nexus-space-md);
  background: rgba(0, 0, 0, 0.15);
  border-bottom: var(--nexus-border-width) solid rgba(255, 20, 80, 0.1);
  gap: var(--nexus-space-sm);
  flex-shrink: 0;
  user-select: none;
  -webkit-app-region: drag;
  cursor: default;
}

.glass-window__titlebar-controls {
  display: flex;
  gap: 6px;
  -webkit-app-region: no-drag;
}

.glass-window__titlebar-controls button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  transition: opacity var(--nexus-transition-fast);
}

.glass-window__body {
  flex: 1;
  overflow: auto;
  position: relative;
  z-index: 1;
  backdrop-filter: blur(calc(var(--glass-depth-2-blur) * 0.8));
  -webkit-backdrop-filter: blur(calc(var(--glass-depth-2-blur) * 0.8));
}

.glass-window__statusbar {
  display: flex;
  align-items: center;
  padding: var(--nexus-space-xs) var(--nexus-space-md);
  background: rgba(0, 0, 0, 0.2);
  border-top: var(--nexus-border-width) solid rgba(255, 20, 80, 0.08);
  font-size: var(--nexus-font-size-xs);
  color: var(--nexus-text-dim);
  flex-shrink: 0;
}

/* ── Focused window ── */
.glass-window:focus-within,
.glass-window--focused {
  border-color: rgba(255, 20, 80, calc(var(--glass-depth-3-border) + 0.2));
  box-shadow:
    0 16px 56px rgba(0,0,0,0.55),
    var(--nexus-shadow-neon),
    var(--glass-inner-shadow);
}

/* ── Minimized ── */
.glass-window--minimized {
  height: 36px;
  overflow: hidden;
}

.glass-window--minimized .glass-window__body,
.glass-window--minimized .glass-window__statusbar {
  display: none;
}

/* ── Maximized ── */
.glass-window--maximized {
  border-radius: 0;
  border: none;
  box-shadow: none;
}

/* ── Floating ── */
.glass-window--floating {
  box-shadow:
    0 20px 60px rgba(0,0,0,0.6),
    0 0 30px var(--nexus-neon-glow-soft),
    var(--glass-inner-shadow);
}


/* ── Glass Toolbar ──
   Thin horizontal toolbar */
.glass-toolbar {
  display: flex;
  align-items: center;
  backdrop-filter: blur(var(--glass-depth-2-blur)) saturate(var(--glass-depth-2-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-2-blur)) saturate(var(--glass-depth-2-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-2-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-2-border));
  border-radius: var(--nexus-radius);
  box-shadow: var(--glass-inner-shadow);
  padding: var(--nexus-space-xs) var(--nexus-space-sm);
  transition: all var(--glass-transition);
}

.glass-toolbar--top {
  border-bottom: var(--nexus-border-width) solid rgba(255, 20, 80, calc(var(--glass-depth-2-border) + 0.05));
  border-radius: var(--nexus-radius) var(--nexus-radius) 0 0;
}

.glass-toolbar--bottom {
  border-top: var(--nexus-border-width) solid rgba(255, 20, 80, calc(var(--glass-depth-2-border) + 0.05));
  border-radius: 0 0 var(--nexus-radius) var(--nexus-radius);
}

.glass-toolbar--floating {
  box-shadow:
    0 4px 16px rgba(0,0,0,0.4),
    var(--nexus-shadow-neon-subtle),
    var(--glass-inner-shadow);
  border-radius: var(--nexus-radius-lg);
}

.glass-toolbar--dense {
  padding: 2px var(--nexus-space-sm);
}


/* ── Glass Sidebar ──
   Vertical navigation sidebar */
.glass-sidebar {
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-3-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-3-border));
  box-shadow: var(--glass-inner-shadow);
  overflow: hidden;
  transition: all var(--glass-transition);
}

.glass-sidebar--left {
  border-right: var(--nexus-border-width-thick) solid rgba(255, 20, 80, calc(var(--glass-depth-3-border) + 0.05));
  border-radius: 0 var(--nexus-radius) var(--nexus-radius) 0;
}

.glass-sidebar--right {
  border-left: var(--nexus-border-width-thick) solid rgba(255, 20, 80, calc(var(--glass-depth-3-border) + 0.05));
  border-radius: var(--nexus-radius) 0 0 var(--nexus-radius);
}

.glass-sidebar--collapsed {
  width: 56px;
}

.glass-sidebar--overlay {
  position: fixed;
  top: 0;
  bottom: 0;
  z-index: var(--nexus-z-overlay);
  box-shadow:
    4px 0 24px rgba(0,0,0,0.5),
    var(--nexus-shadow-neon-subtle);
}

.glass-sidebar--overlay.glass-sidebar--left {
  left: 0;
}

.glass-sidebar--overlay.glass-sidebar--right {
  right: 0;
  box-shadow:
    -4px 0 24px rgba(0,0,0,0.5),
    var(--nexus-shadow-neon-subtle);
}

/* Inner edge glow on content-facing side */
.glass-sidebar--left::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(255, 0, 60, 0.1), transparent);
  pointer-events: none;
}

.glass-sidebar--right::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(255, 0, 60, 0.1), transparent);
  pointer-events: none;
}


/* ── Glass Panel Flat ──
   Minimal depth, background panel */
.glass-panel-flat {
  backdrop-filter: blur(var(--glass-depth-1-blur)) saturate(var(--glass-depth-1-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-1-blur)) saturate(var(--glass-depth-1-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-1-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-1-border));
  border-radius: var(--nexus-radius);
  transition: all var(--glass-transition);
}


/* ── Glass Floating ──
   Elevated floating elements */
.glass-floating {
  position: relative;
  backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-4-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-4-border));
  border-radius: var(--nexus-radius);
  box-shadow:
    0 12px 48px rgba(0,0,0,0.5),
    var(--nexus-shadow-neon),
    var(--glass-inner-shadow);
  overflow: hidden;
  transition: all var(--glass-transition);
}

.glass-floating::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, transparent 30%);
  pointer-events: none;
  z-index: 1;
}

/* Size variants */
.glass-floating--sm {
  border-radius: var(--nexus-radius-sm);
  box-shadow: 0 8px 24px rgba(0,0,0,0.4), var(--nexus-shadow-neon-subtle);
}

.glass-floating--md {
  /* default */
}

.glass-floating--lg {
  border-radius: var(--nexus-radius-lg);
  box-shadow:
    0 16px 64px rgba(0,0,0,0.55),
    var(--nexus-shadow-neon-strong),
    var(--glass-inner-shadow-strong);
}

.glass-floating--interactive {
  cursor: pointer;
}

.glass-floating--interactive:hover {
  transform: translateY(-2px);
  box-shadow:
    0 20px 72px rgba(0,0,0,0.6),
    var(--nexus-shadow-neon-strong),
    var(--glass-inner-shadow-strong);
}


/* ── Glass Sticky ──
   Sticky headers that stay visible while scrolling */
.glass-sticky {
  position: sticky;
  backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-3-opacity));
  border-bottom: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-3-border));
  z-index: var(--nexus-z-sticky);
  transition: all var(--glass-transition);
}

.glass-sticky--top {
  top: 0;
}

.glass-sticky--bottom {
  bottom: 0;
  border-bottom: none;
  border-top: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-3-border));
}

/* Enhanced blur when content scrolls behind (JS toggles this class) */
.glass-sticky--scrolled {
  backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  background: rgba(20, 0, 10, calc(var(--glass-depth-3-opacity) + 0.1));
}


/* ── Glass Modal ──
   Heavy modal overlay */
.glass-modal {
  position: fixed;
  inset: 0;
  z-index: var(--nexus-z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
}

.glass-modal__backdrop {
  position: absolute;
  inset: 0;
  backdrop-filter: blur(var(--glass-depth-5-blur)) saturate(0.8);
  -webkit-backdrop-filter: blur(var(--glass-depth-5-blur)) saturate(0.8);
  background: rgba(5, 0, 3, 0.5);
}

.glass-modal__frame {
  position: relative;
  backdrop-filter: blur(var(--glass-depth-5-blur)) saturate(var(--glass-depth-5-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-5-blur)) saturate(var(--glass-depth-5-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-5-opacity));
  border: var(--nexus-border-width-thick) solid rgba(255, 20, 80, var(--glass-depth-5-border));
  border-radius: var(--nexus-radius-lg);
  box-shadow:
    0 20px 80px rgba(0,0,0,0.7),
    0 0 40px var(--nexus-neon-glow-soft),
    var(--glass-inner-shadow-strong);
  overflow: hidden;
  animation: glass-modal-appear 0.35s var(--glass-transition-appear);
}

@keyframes glass-modal-appear {
  from {
    opacity: 0;
    transform: scale(0.92);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: scale(1);
    filter: blur(0);
  }
}

/* Animated border glow */
.glass-modal__frame--glowing {
  animation: glass-modal-glow-pulse 3s ease-in-out infinite;
}

@keyframes glass-modal-glow-pulse {
  0%, 100% {
    box-shadow:
      0 20px 80px rgba(0,0,0,0.7),
      0 0 30px var(--nexus-neon-glow-soft),
      var(--glass-inner-shadow-strong);
  }
  50% {
    box-shadow:
      0 20px 80px rgba(0,0,0,0.7),
      0 0 50px var(--nexus-neon-glow),
      0 0 100px var(--nexus-neon-glow-soft),
      var(--glass-inner-shadow-strong);
  }
}


/* ── Glass Tooltip ──
   Small floating info panel */
.glass-tooltip {
  position: absolute;
  backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  background: rgba(20, 0, 10, calc(var(--glass-depth-4-opacity) + 0.1));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-4-border));
  border-radius: var(--nexus-radius-sm);
  box-shadow:
    0 4px 16px rgba(0,0,0,0.4),
    var(--nexus-shadow-neon-subtle);
  z-index: var(--nexus-z-tooltip);
  pointer-events: none;
  animation: glass-tooltip-appear 0.15s ease-out;
}

@keyframes glass-tooltip-appear {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(4px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* Arrow */
.glass-tooltip--arrow::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  background: rgba(20, 0, 10, calc(var(--glass-depth-4-opacity) + 0.1));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-4-border));
  transform: rotate(45deg);
}


/* ==========================================================================
   §8  GLASS TRANSITIONS
   Entrance and exit animations for glass elements
   ========================================================================== */

/* ── Appear animations ── */
.glass-appear {
  animation: glass-appear-base var(--glass-transition-appear) forwards;
}

@keyframes glass-appear-base {
  from {
    opacity: 0;
    transform: scale(0.96);
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.glass-appear--scale {
  animation: glass-appear-scale-anim var(--glass-transition-appear) forwards;
}

@keyframes glass-appear-scale-anim {
  from {
    opacity: 0;
    transform: scale(0.85);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: scale(1);
    filter: blur(0);
  }
}

.glass-appear--slide-up {
  animation: glass-appear-slide-up-anim var(--glass-transition-appear) forwards;
}

@keyframes glass-appear-slide-up-anim {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
    filter: blur(2px);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

.glass-appear--slide-down {
  animation: glass-appear-slide-down-anim var(--glass-transition-appear) forwards;
}

@keyframes glass-appear-slide-down-anim {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.98);
    filter: blur(2px);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

.glass-appear--slide-left {
  animation: glass-appear-slide-left-anim var(--glass-transition-appear) forwards;
}

@keyframes glass-appear-slide-left-anim {
  from {
    opacity: 0;
    transform: translateX(-30px);
    filter: blur(3px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
    filter: blur(0);
  }
}

.glass-appear--slide-right {
  animation: glass-appear-slide-right-anim var(--glass-transition-appear) forwards;
}

@keyframes glass-appear-slide-right-anim {
  from {
    opacity: 0;
    transform: translateX(30px);
    filter: blur(3px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
    filter: blur(0);
  }
}

.glass-appear--fade {
  animation: glass-appear-fade-anim 0.3s ease-out forwards;
}

@keyframes glass-appear-fade-anim {
  from {
    opacity: 0;
    filter: blur(4px);
  }
  to {
    opacity: 1;
    filter: blur(0);
  }
}

/* ── Disappear animations ── */
.glass-disappear {
  animation: glass-disappear-scale-anim 0.2s ease-in forwards;
}

@keyframes glass-disappear-scale-anim {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(0.92);
    filter: blur(4px);
  }
}

.glass-disappear--slide-up {
  animation: glass-disappear-slide-up-anim 0.2s ease-in forwards;
}

@keyframes glass-disappear-slide-up-anim {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(-15px); filter: blur(2px); }
}

.glass-disappear--slide-down {
  animation: glass-disappear-slide-down-anim 0.2s ease-in forwards;
}

@keyframes glass-disappear-slide-down-anim {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(15px); filter: blur(2px); }
}

.glass-disappear--slide-left {
  animation: glass-disappear-slide-left-anim 0.2s ease-in forwards;
}

@keyframes glass-disappear-slide-left-anim {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(-20px); filter: blur(3px); }
}

.glass-disappear--slide-right {
  animation: glass-disappear-slide-right-anim 0.2s ease-in forwards;
}

@keyframes glass-disappear-slide-right-anim {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(20px); filter: blur(3px); }
}

/* ── Transition helpers ── */
.glass-transition-blur {
  transition: backdrop-filter var(--glass-transition), -webkit-backdrop-filter var(--glass-transition);
}

.glass-transition-opacity {
  transition: opacity var(--glass-transition), background var(--glass-transition);
}

.glass-transition-border {
  transition: border-color var(--glass-transition), box-shadow var(--glass-transition);
}


/* ==========================================================================
   §9  GLASS STATES
   Interactive state classes for any glass element
   ========================================================================== */

/* ── Active (element is being interacted with) ── */
.glass--active {
  border-color: rgba(255, 20, 80, 0.5) !important;
  box-shadow:
    0 8px 32px rgba(0,0,0,0.5),
    var(--nexus-shadow-neon),
    inset 0 0 20px rgba(255, 0, 60, 0.04),
    var(--glass-inner-shadow);
}

/* ── Focused ── */
.glass--focused {
  outline: none;
  box-shadow:
    0 8px 32px rgba(0,0,0,0.5),
    0 0 0 3px rgba(255, 0, 60, 0.2),
    var(--nexus-shadow-neon-subtle),
    var(--glass-inner-shadow);
}

/* ── Hovered ── */
.glass--hovered {
  background: rgba(25, 0, 12, 0.7) !important;
  border-color: rgba(255, 20, 80, 0.35) !important;
}

/* ── Pressed ── */
.glass--pressed {
  transform: scale(0.99);
  box-shadow:
    0 4px 12px rgba(0,0,0,0.4),
    inset 0 2px 6px rgba(0, 0, 0, 0.3),
    var(--glass-inner-shadow);
}

/* ── Disabled ── */
.glass--disabled {
  filter: saturate(0.15) brightness(0.5);
  backdrop-filter: blur(4px) !important;
  -webkit-backdrop-filter: blur(4px) !important;
  pointer-events: none;
  cursor: not-allowed;
}

.glass--disabled::before,
.glass--disabled::after {
  opacity: 0 !important;
}

/* ── Loading ── */
.glass--loading {
  pointer-events: none;
  position: relative;
}

.glass--loading::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.04) 50%,
    transparent 100%
  );
  background-size: 200% 100%;
  animation: glass-loading-shimmer 1.5s ease-in-out infinite;
  z-index: 10;
  pointer-events: none;
}

@keyframes glass-loading-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Error ── */
.glass--error {
  border-color: rgba(255, 0, 40, 0.4) !important;
  box-shadow:
    0 8px 32px rgba(0,0,0,0.5),
    0 0 15px rgba(255, 0, 40, 0.15),
    inset 0 0 20px rgba(255, 0, 40, 0.02),
    var(--glass-inner-shadow);
}

/* ── Success ── */
.glass--success {
  border-color: rgba(0, 255, 136, 0.3) !important;
  box-shadow:
    0 8px 32px rgba(0,0,0,0.5),
    0 0 15px rgba(0, 255, 136, 0.1),
    inset 0 0 20px rgba(0, 255, 136, 0.02),
    var(--glass-inner-shadow);
}

/* ── Warning ── */
.glass--warning {
  border-color: rgba(255, 170, 0, 0.3) !important;
  box-shadow:
    0 8px 32px rgba(0,0,0,0.5),
    0 0 15px rgba(255, 170, 0, 0.1),
    inset 0 0 20px rgba(255, 170, 0, 0.02),
    var(--glass-inner-shadow);
}

/* ── Selected ── */
.glass--selected {
  border-color: rgba(255, 20, 80, 0.5) !important;
  background: rgba(255, 0, 64, 0.06) !important;
  box-shadow:
    0 0 15px var(--nexus-neon-glow-soft),
    var(--glass-inner-shadow);
}

/* ── Dragging ── */
.glass--dragging {
  transform: scale(1.02) rotate(1deg);
  box-shadow:
    0 20px 60px rgba(0,0,0,0.6),
    var(--nexus-shadow-neon),
    var(--glass-inner-shadow);
  opacity: 0.9;
  z-index: var(--nexus-z-max);
}

/* ── Drop target ── */
.glass--drop-target {
  border: 2px dashed var(--nexus-neon-primary) !important;
  background: rgba(255, 0, 64, 0.06) !important;
  box-shadow: 0 0 20px var(--nexus-neon-glow-soft);
}


/* ==========================================================================
   §10  GLASS COMBINATIONS & PRESETS
   Pre-composed glass configurations for common use cases
   ========================================================================== */

/* ── Window preset ── */
.glass-preset-window {
  backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-3-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-3-border));
  border-top: 1px solid var(--glass-edge-light-color);
  border-left: 1px solid rgba(255, 255, 255, calc(var(--glass-edge-light-intensity) * 0.6));
  border-radius: var(--nexus-radius-lg);
  box-shadow:
    0 12px 48px rgba(0,0,0,0.5),
    var(--nexus-shadow-neon-subtle),
    var(--glass-inner-shadow);
  overflow: hidden;
  position: relative;
}

.glass-preset-window::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 35%);
  background-image: var(--nexus-noise);
  background-size: var(--glass-noise-size) var(--glass-noise-size);
  pointer-events: none;
  z-index: 1;
  opacity: var(--glass-noise-opacity);
}

/* ── Toolbar preset ── */
.glass-preset-toolbar {
  backdrop-filter: blur(var(--glass-depth-2-blur)) saturate(var(--glass-depth-2-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-2-blur)) saturate(var(--glass-depth-2-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-2-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-2-border));
  border-top: 1px solid var(--glass-edge-light-color);
  border-radius: var(--nexus-radius);
  box-shadow: var(--glass-inner-shadow);
}

/* ── Card preset ── */
.glass-preset-card {
  backdrop-filter: blur(var(--glass-depth-2-blur)) saturate(var(--glass-depth-2-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-2-blur)) saturate(var(--glass-depth-2-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-2-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-2-border));
  border-radius: var(--nexus-radius);
  box-shadow:
    0 4px 16px rgba(0,0,0,0.3),
    var(--glass-inner-shadow);
  overflow: hidden;
  position: relative;
  transition: all var(--glass-transition);
}

.glass-preset-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 30%);
  pointer-events: none;
}

.glass-preset-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image: var(--nexus-noise);
  background-size: var(--glass-noise-size) var(--glass-noise-size);
  opacity: var(--glass-noise-opacity);
  pointer-events: none;
}

.glass-preset-card:hover {
  border-color: rgba(255, 20, 80, calc(var(--glass-depth-2-border) + 0.12));
  box-shadow:
    0 8px 24px rgba(0,0,0,0.4),
    var(--nexus-shadow-neon-subtle),
    var(--glass-inner-shadow);
}

/* ── Sidebar preset ── */
.glass-preset-sidebar {
  backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-3-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-3-border));
  box-shadow: var(--glass-inner-shadow);
  overflow: hidden;
  position: relative;
}

.glass-preset-sidebar::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(255, 0, 60, 0.08), transparent);
  pointer-events: none;
}

/* ── Dropdown preset ── */
.glass-preset-dropdown {
  backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-4-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-4-border));
  border-radius: var(--nexus-radius);
  box-shadow:
    0 12px 48px rgba(0,0,0,0.5),
    var(--nexus-shadow-neon-subtle),
    var(--glass-inner-shadow);
  overflow: hidden;
  animation: glass-appear-scale-anim 0.15s ease-out forwards;
}

/* ── Modal preset ── */
.glass-preset-modal {
  backdrop-filter: blur(var(--glass-depth-5-blur)) saturate(var(--glass-depth-5-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-5-blur)) saturate(var(--glass-depth-5-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-5-opacity));
  border: var(--nexus-border-width-thick) solid rgba(255, 20, 80, var(--glass-depth-5-border));
  border-radius: var(--nexus-radius-lg);
  box-shadow:
    0 20px 80px rgba(0,0,0,0.7),
    0 0 30px var(--nexus-neon-glow-soft),
    var(--glass-inner-shadow-strong);
  overflow: hidden;
  position: relative;
  animation: glass-modal-appear 0.35s var(--glass-transition-appear);
}

.glass-preset-modal::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, transparent 30%);
  pointer-events: none;
}

/* ── Tooltip preset ── */
.glass-preset-tooltip {
  backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-4-blur)) saturate(var(--glass-depth-4-saturation));
  background: rgba(20, 0, 10, calc(var(--glass-depth-4-opacity) + 0.1));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-4-border));
  border-radius: var(--nexus-radius-sm);
  box-shadow:
    0 4px 16px rgba(0,0,0,0.4),
    var(--nexus-shadow-neon-subtle);
  animation: glass-appear-fade-anim 0.12s ease-out forwards;
}

/* ── Toast preset ── */
.glass-preset-toast {
  backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-3-blur)) saturate(var(--glass-depth-3-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-3-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-3-border));
  border-top: 1px solid var(--glass-edge-light-color);
  border-radius: var(--nexus-radius);
  box-shadow:
    0 8px 32px rgba(0,0,0,0.4),
    var(--nexus-shadow-neon-subtle),
    var(--glass-inner-shadow);
  overflow: hidden;
  position: relative;
  animation: glass-appear-slide-right-anim 0.3s var(--glass-transition-appear) forwards;
}

.glass-preset-toast::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.04) 0%, transparent 30%);
  pointer-events: none;
}

/* ── Badge preset ── */
.glass-preset-badge {
  backdrop-filter: blur(var(--glass-depth-1-blur)) saturate(var(--glass-depth-1-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-1-blur)) saturate(var(--glass-depth-1-saturation));
  background: rgba(20, 0, 10, var(--glass-depth-1-opacity));
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-1-border));
  border-radius: var(--nexus-radius-round);
}

/* ── Input preset ── */
.glass-preset-input {
  backdrop-filter: blur(var(--glass-depth-1-blur)) saturate(var(--glass-depth-1-saturation));
  -webkit-backdrop-filter: blur(var(--glass-depth-1-blur)) saturate(var(--glass-depth-1-saturation));
  background: rgba(10, 0, 5, 0.75);
  border: var(--nexus-border-width) solid rgba(255, 20, 80, var(--glass-depth-1-border));
  border-radius: var(--nexus-radius-sm);
  box-shadow:
    inset 0 1px 4px rgba(0, 0, 0, 0.4);
  transition: all var(--glass-transition);
}

.glass-preset-input:focus {
  border-color: var(--nexus-neon-primary);
  box-shadow:
    inset 0 1px 4px rgba(0, 0, 0, 0.4),
    0 0 0 3px rgba(255, 0, 60, 0.12),
    0 0 15px rgba(255, 0, 60, 0.08);
}


/* ==========================================================================
   §11  RESPONSIVE GLASS
   Performance-optimized glass for smaller viewports and containers
   ========================================================================== */

/* ── Tablet ── */
@media (max-width: 768px) {
  .glass-depth-1 { backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
  .glass-depth-2 { backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
  .glass-depth-3 { backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
  .glass-depth-4 { backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px); }
  .glass-depth-5 { backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); }

  /* Reduce reflection intensity on mobile */
  .glass-reflect--strong::before {
    background: linear-gradient(135deg, rgba(255,255,255,0.08) 0%, transparent 25%);
  }

  .glass-reflect--strip::before,
  .glass-reflect--diagonal::before {
    display: none;
  }

  /* Simplify noise */
  .glass-noise::after {
    opacity: calc(var(--glass-noise-opacity) * 0.5);
  }
}

/* ── Phone ── */
@media (max-width: 480px) {
  .glass-depth-1 { backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
  .glass-depth-2 { backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
  .glass-depth-3 { backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
  .glass-depth-4 { backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
  .glass-depth-5 { backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); }

  /* Remove reflections entirely on phone */
  .glass-reflect::before {
    display: none;
  }

  /* Remove noise on phone */
  .glass-noise::after {
    display: none;
  }

  /* Simplify inner effects */
  .glass-inner-glow--strong {
    box-shadow: inset 0 0 25px rgba(255, 0, 60, 0.04);
  }

  /* Faster transitions on phone */
  :root {
    --glass-transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --glass-transition-appear: 250ms cubic-bezier(0.34, 1.56, 0.64, 1);
  }
}

/* ── Container queries ── */
.glass-container-query {
  container-type: inline-size;
}

@container (max-width: 300px) {
  .glass-depth-1, .glass-depth-2, .glass-depth-3,
  .glass-depth-4, .glass-depth-5 {
    backdrop-filter: blur(4px) saturate(1.1);
    -webkit-backdrop-filter: blur(4px) saturate(1.1);
  }

  .glass-depth-1::before, .glass-depth-2::before, .glass-depth-3::before,
  .glass-depth-4::before, .glass-depth-5::before {
    display: none;
  }

  .glass-depth-1::after, .glass-depth-2::after, .glass-depth-3::after,
  .glass-depth-4::after, .glass-depth-5::after {
    display: none;
  }
}

@container (max-width: 150px) {
  .glass-depth-1, .glass-depth-2, .glass-depth-3,
  .glass-depth-4, .glass-depth-5 {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: rgba(20, 0, 10, 0.9);
  }
}


/* ==========================================================================
   §12  ACCESSIBILITY
   Respect user preferences for motion, contrast, and transparency
   ========================================================================== */

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  .glass-appear,
  .glass-appear--scale,
  .glass-appear--slide-up,
  .glass-appear--slide-down,
  .glass-appear--slide-left,
  .glass-appear--slide-right,
  .glass-appear--fade,
  .glass-disappear,
  .glass-disappear--slide-up,
  .glass-disappear--slide-down,
  .glass-disappear--slide-left,
  .glass-disappear--slide-right {
    animation: none !important;
    opacity: 1;
    transform: none;
    filter: none;
  }

  .glass-depth-1,
  .glass-depth-2,
  .glass-depth-3,
  .glass-depth-4,
  .glass-depth-5,
  .glass-window,
  .glass-toolbar,
  .glass-sidebar,
  .glass-floating,
  .glass-sticky,
  .glass-modal__frame,
  .glass-tooltip,
  .glass-preset-card {
    transition-duration: 0.01ms !important;
  }

  .glass-modal-appear {
    animation: none !important;
  }
}

/* ── High contrast ── */
@media (prefers-contrast: more) {
  .glass-depth-1 { border-color: rgba(255, 20, 80, 0.4); border-width: 2px; }
  .glass-depth-2 { border-color: rgba(255, 20, 80, 0.5); border-width: 2px; }
  .glass-depth-3 { border-color: rgba(255, 20, 80, 0.6); border-width: 2px; }
  .glass-depth-4 { border-color: rgba(255, 20, 80, 0.7); border-width: 2px; }
  .glass-depth-5 { border-color: rgba(255, 20, 80, 0.8); border-width: 3px; }

  /* Stronger backgrounds for readability */
  .glass-depth-1 { background: rgba(20, 0, 10, 0.6); }
  .glass-depth-2 { background: rgba(20, 0, 10, 0.7); }
  .glass-depth-3 { background: rgba(20, 0, 10, 0.8); }
  .glass-depth-4 { background: rgba(20, 0, 10, 0.85); }
  .glass-depth-5 { background: rgba(20, 0, 10, 0.9); }

  /* Remove decorative effects */
  .glass-reflect::before { display: none; }
  .glass-edge-glow::after { opacity: 0.8; }
}

/* ── Reduced transparency ── */
@media (prefers-reduced-transparency: reduce) {
  .glass-depth-1 { background: rgba(20, 0, 10, 0.85); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
  .glass-depth-2 { background: rgba(20, 0, 10, 0.9); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
  .glass-depth-3 { background: rgba(20, 0, 10, 0.93); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
  .glass-depth-4 { background: rgba(20, 0, 10, 0.95); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
  .glass-depth-5 { background: rgba(20, 0, 10, 0.97); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }

  .glass-reflect::before { display: none; }

  .glass-window__body,
  .glass-sidebar,
  .glass-toolbar {
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
  }
}

/* ── Focus indicators always visible ── */
.glass-depth-1:focus-visible,
.glass-depth-2:focus-visible,
.glass-depth-3:focus-visible,
.glass-depth-4:focus-visible,
.glass-depth-5:focus-visible,
.glass-window:focus-visible,
.glass-floating:focus-visible,
.glass-preset-card:focus-visible {
  outline: 2px solid var(--nexus-neon-primary);
  outline-offset: 2px;
}


/* ==========================================================================
   §13  PERFORMANCE OPTIMIZATIONS
   GPU acceleration and containment hints for smooth rendering
   ========================================================================== */

/* ── GPU compositing hints ──
   Apply to elements that animate frequently */
.glass-depth-4,
.glass-depth-5,
.glass-floating,
.glass-floating--interactive,
.glass-modal__frame,
.glass-preset-dropdown {
  will-change: transform, box-shadow;
  transform: translateZ(0);
}

/* ── Containment for glass containers ── */
.glass-window,
.glass-sidebar,
.glass-toolbar,
.glass-sticky {
  contain: layout style paint;
}

.glass-preset-card,
.glass-preset-window {
  contain: content;
}

/* ── Remove will-change after animation ── */
.glass-appear,
.glass-appear--scale,
.glass-appear--slide-up,
.glass-appear--slide-down,
.glass-appear--slide-left,
.glass-appear--slide-right,
.glass-appear--fade {
  will-change: transform, opacity, filter;
}

/* After animation completes, release GPU resources.
   JavaScript should add .glass-anim-done class. */
.glass-anim-done {
  will-change: auto;
}

/* ── Avoid stacking too many backdrop-filter layers ──
   Nested glass elements use reduced blur to prevent performance issues */
.glass-depth-3 .glass-depth-3,
.glass-depth-4 .glass-depth-4,
.glass-depth-5 .glass-depth-5 {
  backdrop-filter: blur(8px) saturate(1.1);
  -webkit-backdrop-filter: blur(8px) saturate(1.1);
}

.glass-depth-2 .glass-depth-2,
.glass-depth-2 .glass-depth-3 {
  backdrop-filter: blur(6px) saturate(1.1);
  -webkit-backdrop-filter: blur(6px) saturate(1.1);
}

/* Triple nesting — disable blur entirely */
.glass-depth-3 .glass-depth-3 .glass-depth-3,
.glass-depth-4 .glass-depth-4 .glass-depth-4 {
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background: rgba(20, 0, 10, 0.85);
}


/* ==========================================================================
   §14  PRINT STYLES
   Solid backgrounds, no effects, maximum readability
   ========================================================================== */

@media print {
  .glass-depth-1,
  .glass-depth-2,
  .glass-depth-3,
  .glass-depth-4,
  .glass-depth-5,
  .glass-window,
  .glass-toolbar,
  .glass-sidebar,
  .glass-panel-flat,
  .glass-floating,
  .glass-sticky,
  .glass-modal,
  .glass-modal__backdrop,
  .glass-modal__frame,
  .glass-tooltip,
  .glass-preset-window,
  .glass-preset-toolbar,
  .glass-preset-card,
  .glass-preset-sidebar,
  .glass-preset-dropdown,
  .glass-preset-modal,
  .glass-preset-tooltip,
  .glass-preset-toast,
  .glass-preset-badge,
  .glass-preset-input {
    background: #ffffff !important;
    border: 1px solid #cccccc !important;
    box-shadow: none !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    filter: none !important;
  }

  /* Hide all pseudo-element decorations */
  .glass-depth-1::before, .glass-depth-1::after,
  .glass-depth-2::before, .glass-depth-2::after,
  .glass-depth-3::before, .glass-depth-3::after,
  .glass-depth-4::before, .glass-depth-4::after,
  .glass-depth-5::before, .glass-depth-5::after,
  .glass-window::before,
  .glass-sidebar::after,
  .glass-preset-card::before, .glass-preset-card::after,
  .glass-preset-window::before,
  .glass-preset-sidebar::after,
  .glass-preset-toast::before,
  .glass-preset-modal::before,
  .glass-reflect::before,
  .glass-edge-glow::after,
  .glass-inner-gradient::before,
  .glass-noise::after,
  .glass--loading::before {
    display: none !important;
  }

  /* Hide overlay elements entirely */
  .glass-modal__backdrop,
  .glass-tooltip,
  .glass-preset-tooltip {
    display: none !important;
  }

  /* Ensure text is black on white */
  .glass-depth-1 *, .glass-depth-2 *, .glass-depth-3 *,
  .glass-depth-4 *, .glass-depth-5 *,
  .glass-window *, .glass-preset-card *,
  .glass-preset-window * {
    color: #000000 !important;
  }
}

} /* end @layer glass-system */