@casoon/tailwindcss-glass/src/index.css

Pure glassmorphism effects and glass cards for Tailwind CSS v4 - backdrop-filter utilities, glass UI components, and glass animations

/*!
 * Casoon Glass - Complete Glassmorphism System for Tailwind v4
 * Version: 0.9.0 — Pure Glass Effects & Glass Cards
 * 
 * Features:
 * - Glass Backdrop Filter Effects
 * - Glass Background & Border Utilities  
 * - Glass Cards (with backdrop-filter)
 * - Glass UI Components (buttons, nav, etc.)
 * - Glass Animation Effects
 * 
 * Usage: @import "@casoon/tailwindcss-glass/index.css";
 */

/* Note: @import "tailwindcss"; should be added by the consumer */

/* =========================================================
   GLASS DESIGN TOKENS & THEME
   ========================================================= */
@theme {
  /* === GLASS COLOR SYSTEM === */
  --cs-glass-white: #ffffff;
  --cs-glass-black: #000000;
  --cs-glass-blue: #3b82f6;
  --cs-glass-purple: #9333ea;
  --cs-glass-green: #22c55e;
  --cs-glass-pink: #ec4899;
  --cs-glass-amber: #f59e0b;

  /* Glass background opacity tokens - Complete range */
  --cs-glass-bg-xs: rgba(255,255,255,0.02);
  --cs-glass-bg-sm: rgba(255,255,255,0.07);
  --cs-glass-bg-light: rgba(255,255,255,0.10);
  --cs-glass-bg-weak: rgba(255,255,255,0.05);
  --cs-glass-bg-md: rgba(255,255,255,0.12);
  --cs-glass-bg-medium: rgba(255,255,255,0.15);
  --cs-glass-bg-lg: rgba(255,255,255,0.18);
  --cs-glass-bg-strong: rgba(255,255,255,0.20);
  --cs-glass-bg-xl: rgba(255,255,255,0.25);
  --cs-glass-bg-2xl: rgba(255,255,255,0.35);
  --cs-glass-bg-3xl: rgba(255,255,255,0.45);
  --cs-glass-bg-4xl: rgba(255,255,255,0.60);
  --cs-glass-bg-5xl: rgba(255,255,255,0.75);
  
  /* Dark glass backgrounds - Complete range */
  --cs-glass-bg-dark: rgba(0,0,0,0.10);
  --cs-glass-bg-dark-xs: rgba(0,0,0,0.02);
  --cs-glass-bg-dark-sm: rgba(0,0,0,0.07);
  --cs-glass-bg-dark-md: rgba(0,0,0,0.12);
  --cs-glass-bg-dark-lg: rgba(0,0,0,0.18);
  --cs-glass-bg-dark-strong: rgba(0,0,0,0.20);
  --cs-glass-bg-dark-xl: rgba(0,0,0,0.25);
  --cs-glass-bg-dark-2xl: rgba(0,0,0,0.35);
  --cs-glass-bg-dark-3xl: rgba(0,0,0,0.45);
  --cs-glass-bg-dark-4xl: rgba(0,0,0,0.60);
  --cs-glass-bg-dark-5xl: rgba(0,0,0,0.75);

  /* Colored glass backgrounds */
  --cs-glass-bg-blue: rgba(59,130,246,0.10);
  --cs-glass-bg-purple: rgba(147,51,234,0.10);
  --cs-glass-bg-green: rgba(34,197,94,0.10);
  --cs-glass-bg-pink: rgba(236,72,153,0.10);
  --cs-glass-bg-amber: rgba(245,158,11,0.10);

  /* Glass border opacity tokens - Complete range */
  --cs-glass-border-xs: rgba(255,255,255,0.05);
  --cs-glass-border-sm: rgba(255,255,255,0.08);
  --cs-glass-border-light: rgba(255,255,255,0.10);
  --cs-glass-border-md: rgba(255,255,255,0.15);
  --cs-glass-border-medium: rgba(255,255,255,0.20);
  --cs-glass-border-lg: rgba(255,255,255,0.25);
  --cs-glass-border-strong: rgba(255,255,255,0.30);
  --cs-glass-border-xl: rgba(255,255,255,0.40);
  --cs-glass-border-2xl: rgba(255,255,255,0.50);
  --cs-glass-border-3xl: rgba(255,255,255,0.65);
  
  /* Colored glass borders */
  --cs-glass-border-blue: rgba(59,130,246,0.20);
  --cs-glass-border-purple: rgba(147,51,234,0.20);
  --cs-glass-border-green: rgba(34,197,94,0.20);
  --cs-glass-border-pink: rgba(236,72,153,0.20);
  --cs-glass-border-amber: rgba(245,158,11,0.20);

  /* Glass effects tokens */
  --cs-glass-blur-sm: blur(8px);
  --cs-glass-blur: blur(16px);
  --cs-glass-blur-lg: blur(24px);
  --cs-glass-blur-xl: blur(32px);

  --cs-glass-radius-sm: .25rem;
  --cs-glass-radius: .5rem;
  --cs-glass-radius-lg: .75rem;
  --cs-glass-radius-xl: 1rem;
  --cs-glass-radius-2xl: 1.5rem;
  --cs-glass-radius-3xl: 2rem;

  /* Glass shadow tokens */
  --cs-glass-shadow-light: rgba(0,0,0,0.05);
  --cs-glass-shadow-medium: rgba(0,0,0,0.10);
  --cs-glass-shadow-strong: rgba(0,0,0,0.15);
  --cs-glass-shadow-xl: rgba(0,0,0,0.20);

  --cs-glass-shadow-sm-def: 0 1px 2px var(--cs-glass-shadow-light);
  --cs-glass-shadow-def: 0 8px 32px var(--cs-glass-shadow-medium);
  --cs-glass-shadow-lg-def: 0 20px 40px var(--cs-glass-shadow-strong);
  --cs-glass-shadow-xl-def: 0 25px 50px var(--cs-glass-shadow-xl);

  /* Glass misc tokens */
  --cs-glass-transition: .3s;
  --cs-glass-tooltip-bg: rgba(0,0,0,0.80);
  --cs-glass-bg-hover: rgba(255,255,255,0.15);
  --cs-glass-bg-light-hover: rgba(255,255,255,0.25);
  --cs-glass-bg-contrast: rgba(255,255,255,0.20);
  --cs-glass-bg-dark-contrast: rgba(0,0,0,0.20);
  --cs-glass-bg-fallback: rgba(255,255,255,0.25);
  --cs-glass-bg-dark-fallback: rgba(0,0,0,0.25);
  --cs-glass-bg-blue-fallback: rgba(59,130,246,0.20);
  --cs-glass-bg-purple-fallback: rgba(147,51,234,0.20);
  --cs-glass-bg-green-fallback: rgba(34,197,94,0.20);
  --cs-glass-bg-pink-fallback: rgba(236,72,153,0.20);
  --cs-glass-bg-amber-fallback: rgba(245,158,11,0.20);
  --cs-glass-focus-ring: rgba(59,130,246,0.50);
  --cs-glass-backdrop-filter-extra: none;
}

/* =========================================================
   CORE GLASS UTILITIES
   Base glass backdrop-filter utilities
   ========================================================= */

/* Primary glass utility */
@utility cs-glass {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: var(--cs-glass-radius-lg);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  transition: all var(--cs-glass-transition) ease;
}

/* Glass size variants - all intensity levels */
@utility cs-glass-xs {
  background: var(--cs-glass-bg-xs);
  border: 1px solid var(--cs-glass-border-xs);
  border-radius: var(--cs-glass-radius-sm);
  backdrop-filter: var(--cs-glass-blur-sm);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-sm {
  background: var(--cs-glass-bg-sm);
  border: 1px solid var(--cs-glass-border-sm);
  border-radius: var(--cs-glass-radius-sm);
  backdrop-filter: var(--cs-glass-blur-sm);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-md {
  background: var(--cs-glass-bg-md);
  border: 1px solid var(--cs-glass-border-md);
  border-radius: var(--cs-glass-radius);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-lg {
  background: var(--cs-glass-bg-lg);
  border: 1px solid var(--cs-glass-border-lg);
  border-radius: var(--cs-glass-radius-lg);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-xl {
  background: var(--cs-glass-bg-xl);
  border: 1px solid var(--cs-glass-border-xl);
  border-radius: var(--cs-glass-radius-xl);
  backdrop-filter: var(--cs-glass-blur-lg);
  -webkit-backdrop-filter: var(--cs-glass-blur-lg);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-2xl {
  background: var(--cs-glass-bg-2xl);
  border: 1px solid var(--cs-glass-border-2xl);
  border-radius: var(--cs-glass-radius-2xl);
  backdrop-filter: var(--cs-glass-blur-lg);
  -webkit-backdrop-filter: var(--cs-glass-blur-lg);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-3xl {
  background: var(--cs-glass-bg-3xl);
  border: 1px solid var(--cs-glass-border-3xl);
  border-radius: var(--cs-glass-radius-3xl);
  backdrop-filter: var(--cs-glass-blur-xl);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-4xl {
  background: var(--cs-glass-bg-4xl);
  border: 2px solid var(--cs-glass-border-3xl);
  border-radius: var(--cs-glass-radius-3xl);
  backdrop-filter: var(--cs-glass-blur-xl);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-5xl {
  background: var(--cs-glass-bg-5xl);
  border: 2px solid var(--cs-glass-border-3xl);
  border-radius: var(--cs-glass-radius-3xl);
  backdrop-filter: var(--cs-glass-blur-xl);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl);
  transition: all var(--cs-glass-transition) ease;
}

/* Dark glass variant */
@utility cs-glass-dark {
  background: var(--cs-glass-bg-dark);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: var(--cs-glass-radius-lg);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  transition: all var(--cs-glass-transition) ease;
}

/* =========================================================
   GLASS BACKGROUND UTILITIES
   Different opacity levels for glass backgrounds
   ========================================================= */
@utility cs-glass-bg-xs { background: var(--cs-glass-bg-xs); }
@utility cs-glass-bg-sm { background: var(--cs-glass-bg-sm); }
@utility cs-glass-bg-light { background: var(--cs-glass-bg-light); }
@utility cs-glass-bg-weak { background: var(--cs-glass-bg-weak); }
@utility cs-glass-bg-md { background: var(--cs-glass-bg-md); }
@utility cs-glass-bg-medium { background: var(--cs-glass-bg-medium); }
@utility cs-glass-bg-lg { background: var(--cs-glass-bg-lg); }
@utility cs-glass-bg-strong { background: var(--cs-glass-bg-strong); }
@utility cs-glass-bg-xl { background: var(--cs-glass-bg-xl); }
@utility cs-glass-bg-2xl { background: var(--cs-glass-bg-2xl); }
@utility cs-glass-bg-3xl { background: var(--cs-glass-bg-3xl); }
@utility cs-glass-bg-4xl { background: var(--cs-glass-bg-4xl); }
@utility cs-glass-bg-5xl { background: var(--cs-glass-bg-5xl); }

/* Dark glass backgrounds */
@utility cs-glass-bg-dark { background: var(--cs-glass-bg-dark); }
@utility cs-glass-bg-dark-xs { background: var(--cs-glass-bg-dark-xs); }
@utility cs-glass-bg-dark-sm { background: var(--cs-glass-bg-dark-sm); }
@utility cs-glass-bg-dark-md { background: var(--cs-glass-bg-dark-md); }
@utility cs-glass-bg-dark-lg { background: var(--cs-glass-bg-dark-lg); }
@utility cs-glass-bg-dark-strong { background: var(--cs-glass-bg-dark-strong); }
@utility cs-glass-bg-dark-xl { background: var(--cs-glass-bg-dark-xl); }
@utility cs-glass-bg-dark-2xl { background: var(--cs-glass-bg-dark-2xl); }
@utility cs-glass-bg-dark-3xl { background: var(--cs-glass-bg-dark-3xl); }
@utility cs-glass-bg-dark-4xl { background: var(--cs-glass-bg-dark-4xl); }
@utility cs-glass-bg-dark-5xl { background: var(--cs-glass-bg-dark-5xl); }

/* Colored glass backgrounds */
@utility cs-glass-bg-blue { background: var(--cs-glass-bg-blue); }
@utility cs-glass-bg-purple { background: var(--cs-glass-bg-purple); }
@utility cs-glass-bg-green { background: var(--cs-glass-bg-green); }
@utility cs-glass-bg-pink { background: var(--cs-glass-bg-pink); }
@utility cs-glass-bg-amber { background: var(--cs-glass-bg-amber); }

/* =========================================================
   GLASS COLOR UTILITIES
   Complete glass effects with specific color themes
   ========================================================= */
@utility cs-glass-white {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: var(--cs-glass-radius-lg);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  color: var(--cs-glass-black);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-black {
  background: var(--cs-glass-bg-dark);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: var(--cs-glass-radius-lg);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  color: var(--cs-glass-white);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-blue {
  background: var(--cs-glass-bg-blue);
  border: 1px solid var(--cs-glass-border-blue);
  border-radius: var(--cs-glass-radius-lg);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  color: var(--cs-glass-blue);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-purple {
  background: var(--cs-glass-bg-purple);
  border: 1px solid var(--cs-glass-border-purple);
  border-radius: var(--cs-glass-radius-lg);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  color: var(--cs-glass-purple);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-green {
  background: var(--cs-glass-bg-green);
  border: 1px solid var(--cs-glass-border-green);
  border-radius: var(--cs-glass-radius-lg);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  color: var(--cs-glass-green);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-pink {
  background: var(--cs-glass-bg-pink);
  border: 1px solid var(--cs-glass-border-pink);
  border-radius: var(--cs-glass-radius-lg);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  color: var(--cs-glass-pink);
  transition: all var(--cs-glass-transition) ease;
}

@utility cs-glass-amber {
  background: var(--cs-glass-bg-amber);
  border: 1px solid var(--cs-glass-border-amber);
  border-radius: var(--cs-glass-radius-lg);
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  color: var(--cs-glass-amber);
  transition: all var(--cs-glass-transition) ease;
}

/* =========================================================
   GLASS BORDER UTILITIES
   ========================================================= */
@utility cs-glass-border-xs { border-color: var(--cs-glass-border-xs); }
@utility cs-glass-border-sm { border-color: var(--cs-glass-border-sm); }
@utility cs-glass-border-light { border-color: var(--cs-glass-border-light); }
@utility cs-glass-border-md { border-color: var(--cs-glass-border-md); }
@utility cs-glass-border-medium { border-color: var(--cs-glass-border-medium); }
@utility cs-glass-border-lg { border-color: var(--cs-glass-border-lg); }
@utility cs-glass-border-strong { border-color: var(--cs-glass-border-strong); }
@utility cs-glass-border-xl { border-color: var(--cs-glass-border-xl); }
@utility cs-glass-border-2xl { border-color: var(--cs-glass-border-2xl); }
@utility cs-glass-border-3xl { border-color: var(--cs-glass-border-3xl); }

/* Colored glass borders */
@utility cs-glass-border-blue { border-color: var(--cs-glass-border-blue); }
@utility cs-glass-border-purple { border-color: var(--cs-glass-border-purple); }
@utility cs-glass-border-green { border-color: var(--cs-glass-border-green); }
@utility cs-glass-border-pink { border-color: var(--cs-glass-border-pink); }
@utility cs-glass-border-amber { border-color: var(--cs-glass-border-amber); }

/* =========================================================
   GLASS BLUR UTILITIES
   ========================================================= */
@utility cs-glass-blur-sm {
  backdrop-filter: var(--cs-glass-blur-sm);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm);
}

@utility cs-glass-blur {
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
}

@utility cs-glass-blur-lg {
  backdrop-filter: var(--cs-glass-blur-lg);
  -webkit-backdrop-filter: var(--cs-glass-blur-lg);
}

@utility cs-glass-blur-xl {
  backdrop-filter: var(--cs-glass-blur-xl);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl);
}

/* =========================================================
   GLASS RADIUS UTILITIES
   ========================================================= */
@utility cs-glass-radius-sm { border-radius: var(--cs-glass-radius-sm); }
@utility cs-glass-radius { border-radius: var(--cs-glass-radius); }
@utility cs-glass-radius-lg { border-radius: var(--cs-glass-radius-lg); }
@utility cs-glass-radius-xl { border-radius: var(--cs-glass-radius-xl); }
@utility cs-glass-radius-2xl { border-radius: var(--cs-glass-radius-2xl); }
@utility cs-glass-radius-3xl { border-radius: var(--cs-glass-radius-3xl); }

/* Glass rounded utilities - aliases for radius utilities */
@utility cs-glass-rounded { border-radius: var(--cs-glass-radius); }
@utility cs-glass-rounded-sm { border-radius: var(--cs-glass-radius-sm); }
@utility cs-glass-rounded-lg { border-radius: var(--cs-glass-radius-lg); }
@utility cs-glass-rounded-xl { border-radius: var(--cs-glass-radius-xl); }
@utility cs-glass-rounded-2xl { border-radius: var(--cs-glass-radius-2xl); }
@utility cs-glass-rounded-3xl { border-radius: var(--cs-glass-radius-3xl); }

/* =========================================================
   GLASS SHADOW UTILITIES
   ========================================================= */
@utility cs-glass-shadow-sm { box-shadow: var(--cs-glass-shadow-sm-def); }
@utility cs-glass-shadow { box-shadow: var(--cs-glass-shadow-def); }
@utility cs-glass-shadow-lg { box-shadow: var(--cs-glass-shadow-lg-def); }
@utility cs-glass-shadow-xl { box-shadow: var(--cs-glass-shadow-xl-def); }

/* =========================================================
   GLASS ADD-ON UTILITIES
   ========================================================= */

/* Acrylic look (adds saturation/contrast on the backdrop) */
@utility cs-glass-acrylic {
  --cs-glass-backdrop-filter-extra: saturate(135%) contrast(110%);
  backdrop-filter: var(--cs-glass-backdrop-filter-extra) var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-backdrop-filter-extra) var(--cs-glass-blur);
}

/* Frosted edge (inner highlight for stronger glass rim) */
@utility cs-glass-frosted-edge {
  box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--cs-glass-white) 40%, transparent),
    var(--cs-glass-shadow-def);
}

/* Noise/grain overlay */
@utility cs-glass-noise { 
  position: relative; 
  isolation: isolate; 
  &::after {
    content: "";
    position: absolute; 
    inset: 0;
    pointer-events: none;
    mix-blend-mode: overlay;
    opacity: .07;
    background-image: var(--cs-glass-noise-img, none);
    background-size: 200px 200px;
    z-index: 1;
  }
}

/* Text contrast helpers for content placed on glass */
@utility cs-glass-on { color: var(--cs-glass-on, #0f172a); }
@utility cs-glass-on-invert { color: var(--cs-glass-on-invert, #ffffff); }

/* Disabled/read-only helper for interactive glass */
@utility cs-glass-disabled {
  opacity: .6;
  filter: grayscale(20%);
  pointer-events: none;
}

/* Elevation helpers (z-index layering for overlays on glass) */
@utility cs-glass-elev-1 { z-index: 10; }
@utility cs-glass-elev-2 { z-index: 20; }
@utility cs-glass-elev-3 { z-index: 30; }
@utility cs-glass-elev-4 { z-index: 40; }
@utility cs-glass-elev-5 { z-index: 50; }

/* Blend mode utilities (creative tints over imagery) */
@utility cs-glass-blend-overlay { mix-blend-mode: overlay; }
@utility cs-glass-blend-screen { mix-blend-mode: screen; }
@utility cs-glass-blend-multiply { mix-blend-mode: multiply; }

/* Layout helpers for sticky bars & performance hints */
@utility cs-glass-sticky { position: sticky; top: 0; }
@utility cs-glass-will-change { will-change: transform, backdrop-filter; }

/* Isolation utility for Canvas/Background-Layering issues */
@utility cs-glass-isolate { isolation: isolate; }

/* =========================================================
   GLASS INTERACTIVE STATE UTILITIES
   Hover and focus states for glass elements
   ========================================================= */
@utility cs-glass-bg-hover { background: var(--cs-glass-bg-hover); }
@utility cs-glass-bg-light-hover { background: var(--cs-glass-bg-light-hover); }
@utility cs-glass-focus-ring {
  outline: 2px solid var(--cs-glass-focus-ring);
  outline-offset: 2px;
}

/* =========================================================
   GLASS CARDS SYSTEM
   Cards with glass backdrop-filter effects
   ========================================================= */

/* Glass card base component */
@utility cs-glass-card {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: var(--cs-glass-shadow-def);
  transition: all var(--cs-glass-transition) ease;
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  
  &:hover {
    background: var(--cs-glass-bg-hover);
    box-shadow: 0 20px 40px var(--cs-glass-shadow-strong);
    transform: translateY(-2px);
    border: 1px solid var(--cs-glass-border-strong);
  }
  
  &:focus-within {
    outline: 2px solid var(--cs-glass-focus-ring);
    outline-offset: 2px;
  }
}

/* Light glass card variant */
@utility cs-glass-card-light {
  background: var(--cs-glass-bg-medium);
  border: 1px solid var(--cs-glass-border-strong);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: var(--cs-glass-shadow-def);
  transition: all var(--cs-glass-transition) ease;
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  
  &:hover {
    background: var(--cs-glass-bg-light-hover);
    transform: translateY(-1px);
    box-shadow: 0 12px 24px var(--cs-glass-shadow-strong);
  }
  
  &:focus-within {
    outline: 2px solid var(--cs-glass-focus-ring);
    outline-offset: 2px;
  }
}

/* Glass Feature Card Component */
@utility cs-card-feature-glass {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: 1.5rem;
  border-radius: 20px;
  box-shadow: var(--cs-glass-shadow-def);
  padding: 2rem;
  text-align: center;
  position: relative;
  transition: all var(--cs-glass-transition) ease;
  
  &:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 40px var(--cs-glass-shadow-strong);
    background: var(--cs-glass-bg-hover);
  }
}

/* Glass Product Card Component */
@utility cs-card-product-glass {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-radius: 20px;
  box-shadow: var(--cs-glass-shadow-def);
  overflow: hidden;
  transition: all var(--cs-glass-transition) ease;
  position: relative;
  display: flex;
  flex-direction: column;
  max-width: 20rem;
  
  &:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 40px var(--cs-glass-shadow-strong);
    background: var(--cs-glass-bg-hover);
  }
}

/* Glass Pricing Card Component */
@utility cs-card-pricing-glass {
  background: var(--cs-glass-bg-light);
  border: 2px solid var(--cs-glass-border-medium);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  display: grid;
  grid-template-rows: auto 1fr auto;
  border-radius: 20px;
  box-shadow: var(--cs-glass-shadow-def);
  padding: 2rem;
  text-align: center;
  position: relative;
  transition: all var(--cs-glass-transition) ease;
  
  &:hover {
    transform: translateY(-4px);
    box-shadow: 0 25px 50px var(--cs-glass-shadow-xl);
    background: var(--cs-glass-bg-hover);
    border-color: var(--cs-glass-border-strong);
  }
}

/* =========================================================
   GLASS UI COMPONENTS
   Ready-to-use glass UI elements with backdrop-filter
   ========================================================= */

/* Glass navigation component */
@utility cs-glass-nav {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: 12px;
  box-shadow: var(--cs-glass-shadow-def);
  transition: all var(--cs-glass-transition) ease;
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
}

@utility cs-glass-nav-light {
  background: var(--cs-glass-bg-medium);
  border: 1px solid var(--cs-glass-border-strong);
  border-radius: 12px;
  box-shadow: var(--cs-glass-shadow-def);
  transition: all var(--cs-glass-transition) ease;
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
}

/* Glass button component */
@utility cs-glass-button {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: 12px;
  padding: 0.75rem 1.5rem;
  transition: all var(--cs-glass-transition) ease;
  cursor: pointer;
  min-height: 2.5rem; /* touch target */
  min-width: 2.5rem;
  -webkit-tap-highlight-color: transparent;
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
  
  &:hover {
    background: var(--cs-glass-bg-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 16px var(--cs-glass-shadow-medium);
  }
  
  &:focus,
  &:focus-visible {
    outline: 2px solid var(--cs-glass-focus-ring);
    outline-offset: 2px;
  }
  
  &:active {
    transform: translateY(0);
    box-shadow: 0 4px 8px var(--cs-glass-shadow-medium);
  }
}

/* Glass toast component */
@utility cs-glass-toast {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: 0.75rem;
  padding: 1rem 1.5rem;
  box-shadow: 0 8px 32px var(--cs-glass-shadow-strong);
  position: relative;
  overflow: hidden;
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
}

/* Glass tooltip component */
@utility cs-glass-tooltip {
  background: var(--cs-glass-tooltip-bg);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: 0.5rem;
  padding: 0.5rem 0.75rem;
  box-shadow: 0 4px 16px var(--cs-glass-shadow-xl);
  font-size: 0.875rem;
  color: white;
  white-space: nowrap;
  z-index: 50;
  backdrop-filter: var(--cs-glass-blur-sm);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm);
}

/* Glass dropdown component */
@utility cs-glass-dropdown {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: 0.75rem;
  box-shadow: var(--cs-glass-shadow-def);
  padding: 0.5rem;
  min-width: 12rem;
  z-index: 50;
  backdrop-filter: var(--cs-glass-blur);
  -webkit-backdrop-filter: var(--cs-glass-blur);
}

/* Glass Forms System */
@utility cs-form-glass {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: 1rem;
  padding: 2rem;
}

@utility cs-input-glass {
  padding: 0.75rem 1rem;
  background: var(--cs-glass-bg-md);
  border: 1px solid var(--cs-glass-border-strong);
  border-radius: 0.75rem;
  transition: all var(--cs-glass-transition) ease;
  color: inherit;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  
  &:focus {
    outline: none;
    border-color: var(--cs-glass-focus-ring);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--cs-glass-focus-ring) 20%, transparent);
  }
  
  &::placeholder {
    color: color-mix(in srgb, currentColor 60%, transparent);
  }
}

@utility cs-button-primary-glass {
  background: var(--cs-glass-bg-medium);
  border: 1px solid var(--cs-glass-border-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: inherit;
  padding: 0.875rem 1.5rem;
  border-radius: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--cs-glass-transition) ease;
  
  &:hover {
    background: var(--cs-glass-bg-strong);
    transform: translateY(-1px);
  }
  
  &:focus {
    outline: 2px solid transparent;
    outline-offset: 2px;
    box-shadow: 0 0 0 2px var(--cs-glass-focus-ring), 0 0 0 4px color-mix(in srgb, var(--cs-glass-focus-ring) 20%, transparent);
  }
}

/* =========================================================
   GLASS PRO EFFECTS
   Advanced animations and glass effects
   ========================================================= */

/* Animated morph effects */
@utility cs-glass-morph-in {
  animation: glassMorphIn 0.4s ease-out both;
}

@utility cs-glass-morph-out {
  animation: glassMorphOut 0.3s ease-in both;
}

@keyframes glassMorphIn {
  from {
    opacity: 0;
    transform: scale(0.95);
    backdrop-filter: blur(0px);
  }
  to {
    opacity: 1;
    transform: scale(1);
    backdrop-filter: var(--cs-glass-blur);
  }
}

@keyframes glassMorphOut {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(0.95);
  }
}

/* 3D hover glass effect */
@utility cs-glass-3d-hover {
  transform-style: preserve-3d;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  
  &:hover {
    transform: rotateX(6deg) rotateY(-4deg) scale(1.02);
    box-shadow: 0 24px 48px var(--cs-glass-shadow-xl);
  }
}

/* Glossy highlight overlays */
@utility cs-glass-gloss-top {
  position: relative;
  &::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0; height: 20%;
    background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
    border-top-left-radius: inherit;
    border-top-right-radius: inherit;
    pointer-events: none;
    z-index: 2;
    mix-blend-mode: soft-light;
  }
}

@utility cs-glass-gloss-left {
  position: relative;
  &::before {
    content: "";
    position: absolute;
    top: 0; bottom: 0; left: 0; width: 15%;
    background: linear-gradient(to right, rgba(255,255,255,0.35), transparent);
    pointer-events: none;
    z-index: 2;
    mix-blend-mode: soft-light;
  }
}

@utility cs-glass-gloss-right {
  position: relative;
  &::before {
    content: "";
    position: absolute;
    top: 0; bottom: 0; right: 0; width: 15%;
    background: linear-gradient(to left, rgba(255,255,255,0.35), transparent);
    pointer-events: none;
    z-index: 2;
    mix-blend-mode: soft-light;
  }
}

/* Pro theme presets */
@utility cs-glass-theme-neon {
  --cs-glass-bg-light: rgba(58, 227, 255, 0.1);
  --cs-glass-border-medium: rgba(58, 227, 255, 0.25);
  --cs-glass-shadow-def: 0 8px 32px rgba(58, 227, 255, 0.25);
  --cs-glass-focus-ring: rgba(58, 227, 255, 0.6);
}

@utility cs-glass-theme-carbon {
  --cs-glass-bg-light: rgba(30, 30, 30, 0.25);
  --cs-glass-border-medium: rgba(255, 255, 255, 0.08);
  --cs-glass-shadow-def: 0 8px 32px rgba(0,0,0,0.4);
  --cs-glass-focus-ring: rgba(255, 255, 255, 0.3);
}

@utility cs-glass-theme-pastel {
  --cs-glass-bg-light: rgba(255, 230, 250, 0.12);
  --cs-glass-border-medium: rgba(255, 230, 250, 0.25);
  --cs-glass-shadow-def: 0 8px 32px rgba(255, 230, 250, 0.25);
  --cs-glass-focus-ring: rgba(255, 230, 250, 0.6);
}

/* =========================================================
   RESPONSIVE GLASS UTILITIES
   ========================================================= */

/* Responsive glass blur based on container size */
@utility cs-glass-responsive {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  backdrop-filter: var(--cs-glass-blur-sm);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm);
  background-clip: padding-box;
  
  @container (min-width: 320px) {
    backdrop-filter: var(--cs-glass-blur-sm);
    -webkit-backdrop-filter: var(--cs-glass-blur-sm);
  }
  
  @container (min-width: 640px) {
    backdrop-filter: var(--cs-glass-blur);
    -webkit-backdrop-filter: var(--cs-glass-blur);
  }
  
  @container (min-width: 1024px) {
    backdrop-filter: var(--cs-glass-blur-lg);
    -webkit-backdrop-filter: var(--cs-glass-blur-lg);
  }
}

/* Base backdrop filter utility */
@utility cs-glass-backdrop-clip {
  background-clip: padding-box;
}

/* =========================================================
   FALLBACKS & BROWSER SUPPORT
   ========================================================= */

/* For browsers that don't support backdrop-filter,
   provide a fallback with slightly higher opacity background */
@supports not ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .cs-glass,
  .cs-glass-card,
  .cs-glass-card-light,
  .cs-glass-nav,
  .cs-glass-nav-light,
  .cs-glass-button,
  .cs-glass-toast,
  .cs-glass-tooltip,
  .cs-glass-dropdown {
    background: var(--cs-glass-bg-fallback);
    box-shadow: 0 4px 16px var(--cs-glass-shadow-medium);
  }
  
  .cs-glass-dark {
    background: var(--cs-glass-bg-dark-fallback);
  }
  
  .cs-glass-blue {
    background: var(--cs-glass-bg-blue-fallback);
  }
  
  .cs-glass-purple {
    background: var(--cs-glass-bg-purple-fallback);
  }
  
  .cs-glass-green {
    background: var(--cs-glass-bg-green-fallback);
  }
  
  .cs-glass-pink {
    background: var(--cs-glass-bg-pink-fallback);
  }
  
  .cs-glass-amber {
    background: var(--cs-glass-bg-amber-fallback);
  }
  
  .cs-card-feature-glass,
  .cs-card-product-glass,
  .cs-card-pricing-glass {
    background: rgba(255, 255, 255, 0.4);
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .cs-glass, .cs-glass-card, .cs-glass-nav, .cs-glass-button {
    border-width: 2px;
    background: var(--cs-glass-bg-contrast);
  }
  .cs-glass-dark {
    background: var(--cs-glass-bg-dark-contrast);
    border-color: var(--cs-glass-border-strong);
  }
}

/* Forced colors mode support (Windows High Contrast) */
@media (forced-colors: active) {
  .cs-glass, .cs-glass-card, .cs-glass-nav, .cs-glass-button {
    background: Canvas;
    border-color: CanvasText;
    box-shadow: none;
  }
  .cs-glass-tooltip {
    background: CanvasText;
    color: Canvas;
    border-color: CanvasText;
    box-shadow: none;
  }
}

/* Mobile optimization - reduce blur on small screens */
@media (max-width: 480px) {
  :root {
    --cs-glass-blur: var(--cs-glass-blur-sm);
  }
}

/* Reduced motion optimizations */
@media (prefers-reduced-motion: reduce) {
  .cs-glass-morph-in,
  .cs-glass-morph-out,
  .cs-glass-3d-hover {
    animation: none !important;
    transform: none !important;
  }
}