.glass {
  position: relative;
  backdrop-filter: blur(var(--blur, 10px)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--blur, 10px)) saturate(180%);
  border: 1px solid currentColor;
  transition: all 0.3s ease;
}

/* BORDER OPACITY */
.glass::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  border: 1px solid currentColor;
  opacity: var(--border-opacity, 0.3);
}

/* BACKGROUND */
.glass::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: var(--opacity, 0.7);
}

/* TINT COLORS */
.tint.white::after {
  background: rgba(255, 255, 255, 0.8);
}

.tint.black::after {
  background: rgba(0, 0, 0, 0.6);
}

.tint.neutral::after {
  background: rgba(128, 128, 128, 0.3);
}

.tint.custom::after {
  background: var(--tint-color, rgba(255, 255, 255, 0.5));
}

/* BORDER RADIUS */
.rounded-none {
  border-radius: 0;
}

.rounded-sm {
  border-radius: 0.25rem;
}

.rounded-md {
  border-radius: 0.375rem;
}

.rounded-lg {
  border-radius: 0.5rem;
}

.rounded-xl {
  border-radius: 0.75rem;
}

.rounded-2xl {
  border-radius: 1rem;
}

.rounded-full {
  border-radius: 9999px;
}

/* VARIANTS */

/* Frosted - classic glass effect */
.variant-frosted {
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
}

.variant-frosted::after {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0.1) 100%);
}

/* Crystal - very clear glass */
.variant-crystal {
  backdrop-filter: blur(var(--blur, 10px)) saturate(200%);
  border: 2px solid currentColor;
}

.variant-crystal::after {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.6) 0%, rgba(255, 255, 255, 0.2) 100%);
  opacity: 0.8;
}

.variant-crystal:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.15);
}

/* Dark - dark glass */
.variant-dark {
  border-color: rgba(255, 255, 255, 0.2);
}

.variant-dark::after {
  background: rgba(0, 0, 0, 0.6);
}

.variant-dark::before {
  border-color: rgba(255, 255, 255, 0.15);
}

/* Light - light glass */
.variant-light {
  border-color: rgba(0, 0, 0, 0.2);
}

.variant-light::after {
  background: rgba(255, 255, 255, 0.85);
}

/* Neon - glowing glass */
.variant-neon {
  box-shadow: 0 0 20px var(--glow-color, currentColor);
}

.variant-neon::before {
  border-color: var(--glow-color, currentColor);
  opacity: 0.5;
}

.variant-neon::after {
  background: rgba(0, 0, 0, 0.3);
}

/* GLOW EFFECT */
.glass.glow {
  box-shadow: 0 0 20px var(--glow-color, currentColor), inset 0 0 20px var(--glow-color, currentColor);
}

.glass.glow::before {
  border-color: var(--glow-color, currentColor);
  box-shadow: 0 0 10px var(--glow-color, currentColor);
}

/* HOVER EFFECTS */
.glass:hover {
  opacity: 1;
}

.variant-frosted:hover,
.variant-crystal:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.15);
}

.variant-neon:hover {
  box-shadow: 0 0 30px var(--glow-color, currentColor), inset 0 0 30px var(--glow-color, currentColor);
}

/* REFLECTION EFFECT */
.glass.reflection::before {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.3) 0%, transparent 50%);
}

.glass.reflection::after {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0.1) 100%);
}

/* CRACKED EFFECT */
.glass.cracked::before {
  background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100"><path d="M10,10 Q30,30 50,10 T90,10 M20,50 Q40,30 50,50 T80,50" stroke="currentColor" stroke-width="1" fill="none" opacity="0.3"/></svg>');
  background-size: 100px 100px;
  background-repeat: repeat;
}

/* FROSTED EDGE */
.glass.frostedEdge {
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.2), inset 0 0 0 2px rgba(0, 0, 0, 0.1);
}

.glass.frostedEdge::before {
  opacity: 0;
}

/* RAINBOW GLOW */
.glass.rainbow::before {
  background: linear-gradient(45deg, #ff0000, #ff7f00, #ffff00, #00ff00, #0000ff, #4b0082, #9400d3);
  background-size: 400% 400%;
  animation: rainbow 3s ease infinite;
  opacity: 0.8;
}

@keyframes rainbow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* PULSE GLOW */
.glass.pulse::before {
  animation: pulse-border 2s ease-in-out infinite;
}

@keyframes pulse-border {
  0%, 100% {
    opacity: var(--border-opacity, 0.3);
    box-shadow: none;
  }
  50% {
    opacity: 0.8;
    box-shadow: 0 0 15px var(--glow-color, currentColor);
  }
}