@casoon/tailwindcss-glass/src/index-old.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 — COMPLETE CONSOLIDATED GLASS SYSTEM
 * 
 * SYSTEMATICALLY CONSOLIDATED FROM:
 * 
 * === GLASS PACKAGE (9 files) ===
 * - src/index.css (root)
 * - src/styles/base/tokens.css
 * - src/styles/base/glass-core.css  
 * - src/styles/base/fallbacks.css
 * - src/styles/utilities/variants.css
 * - src/styles/utilities/addons.css
 * - src/styles/utilities/responsive.css
 * - src/styles/components/ui-elements.css
 * - src/styles/effects/pro-effects.css
 * 
 * === CARDS PACKAGE (7 files) ===
 * - src/index.css (root)
 * - src/styles/base/tokens.css
 * - src/styles/presets/card-feature.css
 * - src/styles/presets/card-product.css 
 * - src/styles/presets/card-product-clean.css
 * - src/styles/presets/card-pricing.css
 * - src/styles/presets/card-testimonial.css
 * 
 * === NAVIGATION PACKAGE (13 files) ===
 * - src/index.css (root)
 * - src/styles/index.css
 * - src/styles/base/tokens.css
 * - src/styles/variants.css
 * - src/styles/utilities/navigation.css
 * - src/styles/utilities/accessibility.css
 * - src/styles/components/nav.css
 * - src/styles/components/navbar.css
 * - src/styles/components/nav-tabs.css
 * - src/styles/components/nav-pills.css
 * - src/styles/components/breadcrumbs.css
 * - src/styles/components/drawer.css
 * - src/styles/effects/animations.css
 * 
 * TOTAL: 29 CSS FILES → Pure Tailwind v4 (179 classes + 88 @utility)
 * 
 * Usage: @import "@casoon/tailwindcss-glass/index.css";
 */

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

/* =========================================================
   CONSOLIDATED DESIGN TOKENS & THEME
   All tokens from glass, cards, navigation packages merged
   ========================================================= */
@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;
  
  /* Dark mode card adjustments */
  @media (prefers-color-scheme: dark) {
    --cs-card-bg: color-mix(in srgb, #ffffff 5%, #1a1a1a);
    --cs-card-shadow: 0 4px 6px rgba(0, 0, 0, 0.25);
    --cs-card-shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.35);
  }

  /* === CARD SYSTEM TOKENS === */
  /* v0.8.x Compatible Card System */
  --cs-card-border-radius: 1rem;
  --cs-card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --cs-card-shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.15);
  --cs-card-bg: #ffffff;
  --cs-card-padding: 1.5rem;
  --cs-card-spacing: 1rem;
  
  /* Extended Card System for compatibility */
  --cs-card-border: var(--cs-border, #e5e7eb);
  --cs-card-radius: var(--cs-card-border-radius);
  --cs-card-text: var(--cs-text, #111827);
  --cs-card-text-muted: var(--cs-text-muted, #6b7280);
  --cs-card-brand: var(--cs-brand, #3b82f6);
  --cs-card-brand-ink: var(--cs-brand-ink, #ffffff);
  --cs-card-transition: var(--cs-transition, 0.3s ease);
  
  /* Card spacing system */
  --cs-card-space-xs: 0.25rem;
  --cs-card-space-sm: 0.375rem; 
  --cs-card-space-md: 0.75rem;
  --cs-card-space-lg: 1rem;
  --cs-card-space-xl: 1.5rem;
  --cs-card-space-2xl: 2rem;
  --cs-card-hover-lift: -4px;
  
  /* Card typography */
  --cs-card-font-size-xs: 0.75rem;
  --cs-card-font-size-sm: 0.875rem;
  --cs-card-font-size: 1rem;
  --cs-card-font-size-lg: 1.125rem;
  --cs-card-font-size-xl: 1.25rem;
  --cs-card-font-size-2xl: 1.5rem;
  --cs-card-line-height: 1.6;
  
  /* Card shadows expanded */
  --cs-card-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --cs-card-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --cs-card-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --cs-card-shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Card radius system */
  --cs-card-radius-sm: 0.375rem;
  --cs-card-radius-md: 0.5rem;
  --cs-card-radius-lg: 0.75rem;
  --cs-card-radius-xl: 1rem;

  /* === NAVIGATION TOKENS === */
  --cs-nav-bg: var(--cs-glass-bg-light);
  --cs-nav-border: var(--cs-glass-border-medium);
  --cs-nav-blur: var(--cs-glass-blur);
  --cs-nav-text: var(--cs-text, #374151);
  --cs-nav-text-muted: var(--cs-text-muted, #9ca3af);
  --cs-nav-text-active: var(--cs-brand, #3b82f6);
  --cs-nav-bg-hover: var(--cs-glass-bg-hover);
  --cs-nav-bg-active: var(--cs-glass-bg-medium);
  --cs-nav-transition: var(--cs-transition, 0.2s ease);
  --cs-nav-shadow: var(--cs-glass-shadow-def);
  
  /* Navigation spacing */
  --cs-nav-space-xs: 0.25rem;
  --cs-nav-space-sm: 0.5rem;
  --cs-nav-space-md: 0.75rem;
  --cs-nav-space-lg: 1rem;
  --cs-nav-space-xl: 1.5rem;
  
  /* Navigation z-index */
  --cs-nav-z-dropdown: 30;
  --cs-nav-z-modal: 40;
  --cs-nav-z-overlay: 50;
  --cs-nav-z-drawer: 60;
  
  /* Navigation typography */
  --cs-nav-font-size-sm: 0.875rem;
  --cs-nav-font-size: 1rem;
  --cs-nav-font-size-lg: 1.125rem;
  
  /* === FORMS SYSTEM TOKENS === */
  /* v0.8.x Compatible Form System */
  --cs-form-border-radius: 0.5rem;
  --cs-form-border-color: color-mix(in srgb, currentColor 20%, transparent);
  --cs-form-focus-color: #3b82f6;
  --cs-form-error-color: #ef4444;
  --cs-form-success-color: #10b981;
  --cs-form-spacing: 1rem;
  --cs-form-transition: all 200ms ease;
  --cs-form-padding: 0.75rem 1rem;
  --cs-form-focus-shadow: 0 0 0 3px;
}

/* =========================================================
   CORE GLASS UTILITIES
   Complete glass effect system with all variants
   ========================================================= */

/* Base glass effects with complete backdrop-filter support */
@utility cs-glass {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-dark {
  background: var(--cs-glass-bg-dark);
  border: 1px solid var(--cs-glass-border-light);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

/* Light glass opacity scale - Complete range */
@utility cs-glass-xs {
  background: var(--cs-glass-bg-xs);
  border: 1px solid var(--cs-glass-border-xs);
  backdrop-filter: var(--cs-glass-blur-sm) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-sm {
  background: var(--cs-glass-bg-sm);
  border: 1px solid var(--cs-glass-border-sm);
  backdrop-filter: var(--cs-glass-blur-sm) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-weak {
  background: var(--cs-glass-bg-weak);
  border: 1px solid var(--cs-glass-border-light);
  backdrop-filter: var(--cs-glass-blur-sm) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-md {
  background: var(--cs-glass-bg-md);
  border: 1px solid var(--cs-glass-border-md);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-medium {
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-lg {
  background: var(--cs-glass-bg-lg);
  border: 1px solid var(--cs-glass-border-lg);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-strong {
  background: var(--cs-glass-bg-medium);
  border: 1px solid var(--cs-glass-border-strong);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-xl {
  background: var(--cs-glass-bg-xl);
  border: 1px solid var(--cs-glass-border-xl);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-2xl {
  background: var(--cs-glass-bg-2xl);
  border: 1px solid var(--cs-glass-border-2xl);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-3xl {
  background: var(--cs-glass-bg-3xl);
  border: 1px solid var(--cs-glass-border-3xl);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-4xl {
  background: var(--cs-glass-bg-4xl);
  border: 1px solid var(--cs-glass-border-2xl);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-5xl {
  background: var(--cs-glass-bg-5xl);
  border: 1px solid var(--cs-glass-border-3xl);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

/* Dark glass opacity scale - Complete range */
@utility cs-glass-dark-xs {
  background: var(--cs-glass-bg-dark-xs);
  border: 1px solid var(--cs-glass-border-xs);
  backdrop-filter: var(--cs-glass-blur-sm) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-dark-sm {
  background: var(--cs-glass-bg-dark-sm);
  border: 1px solid var(--cs-glass-border-sm);
  backdrop-filter: var(--cs-glass-blur-sm) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-dark-md {
  background: var(--cs-glass-bg-dark-md);
  border: 1px solid var(--cs-glass-border-md);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-dark-lg {
  background: var(--cs-glass-bg-dark-lg);
  border: 1px solid var(--cs-glass-border-lg);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-dark-xl {
  background: var(--cs-glass-bg-dark-xl);
  border: 1px solid var(--cs-glass-border-xl);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-dark-2xl {
  background: var(--cs-glass-bg-dark-2xl);
  border: 1px solid var(--cs-glass-border-2xl);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-dark-3xl {
  background: var(--cs-glass-bg-dark-3xl);
  border: 1px solid var(--cs-glass-border-3xl);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-dark-4xl {
  background: var(--cs-glass-bg-dark-4xl);
  border: 1px solid var(--cs-glass-border-2xl);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-dark-5xl {
  background: var(--cs-glass-bg-dark-5xl);
  border: 1px solid var(--cs-glass-border-3xl);
  backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur-xl) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

/* Colored glass variants */
@utility cs-glass-blue {
  background: var(--cs-glass-bg-blue);
  border: 1px solid var(--cs-glass-border-blue);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-purple {
  background: var(--cs-glass-bg-purple);
  border: 1px solid var(--cs-glass-border-purple);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-green {
  background: var(--cs-glass-bg-green);
  border: 1px solid var(--cs-glass-border-green);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-pink {
  background: var(--cs-glass-bg-pink);
  border: 1px solid var(--cs-glass-border-pink);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

@utility cs-glass-amber {
  background: var(--cs-glass-bg-amber);
  border: 1px solid var(--cs-glass-border-amber);
  backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  -webkit-backdrop-filter: var(--cs-glass-blur) var(--cs-glass-backdrop-filter-extra);
  background-clip: padding-box;
}

/* Glass radius utilities */
@utility cs-glass-rounded-sm { border-radius: var(--cs-glass-radius-sm); }
@utility cs-glass-rounded { border-radius: var(--cs-glass-radius); }
@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
   Optional effects and add-on features
   ========================================================= */

/* 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 UI COMPONENTS
   Ready-to-use glass UI elements
   ========================================================= */

/* 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 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 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;
  }
}

@utility cs-glass-gloss-bottom {
  position: relative;
  &::before {
    content: "";
    position: absolute;
    bottom: 0; left: 0; right: 0; height: 20%;
    background: linear-gradient(to top, rgba(255,255,255,0.3), transparent);
    pointer-events: none;
    z-index: 2;
    mix-blend-mode: soft-light;
  }
}

/* Skeleton glass blocks */
@utility cs-glass-skeleton {
  position: relative;
  overflow: hidden;
  background: var(--cs-glass-bg-light);
  border: 1px solid var(--cs-glass-border-medium);
  border-radius: var(--cs-glass-radius);
  min-height: 2rem;
  isolation: isolate;
  backdrop-filter: var(--cs-glass-blur-sm);
  -webkit-backdrop-filter: var(--cs-glass-blur-sm);
  
  &::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: glassSkeletonShimmer 1.2s infinite;
  }
}

@keyframes glassSkeletonShimmer {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Card-specific animations */
@keyframes cs-orb-float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(30px, -30px) rotate(120deg); }
  66% { transform: translate(-20px, 20px) rotate(240deg); }
}

/* 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);
}

/* =========================================================
   CARD SYSTEM COMPONENTS
   Feature, Product, Pricing & Testimonial cards
   ========================================================= */

/* Feature Card Component */
@utility cs-card-feature {
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: var(--cs-card-space-lg, 1.5rem);
  background: var(--cs-card-bg, #ffffff);
  border: 1px solid var(--cs-card-border, #e5e7eb);
  border-radius: var(--cs-card-radius-lg, 12px);
  box-shadow: var(--cs-card-shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.05));
  padding: var(--cs-card-space-xl, 2rem);
  text-align: center;
  position: relative;
  transition: var(--cs-card-transition, all 0.2s ease);
  
  &:hover {
    transform: translateY(var(--cs-card-hover-lift, -2px));
    box-shadow: var(--cs-card-shadow-md, 0 4px 6px rgba(0, 0, 0, 0.07));
  }
}

/* Feature card with glass styling */
@utility cs-card-feature-glass {
  background: var(--cs-acrylic-tint, rgba(255, 255, 255, 0.1));
  backdrop-filter: saturate(140%) blur(12px);
  border: 1px solid var(--cs-acrylic-border, rgba(255, 255, 255, 0.2));
}

/* Product Card Component */
@utility cs-card-product {
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--cs-surface, #ffffff);
  border: 1px solid var(--cs-border, #e5e7eb);
  border-radius: var(--cs-radius-lg, 12px);
  box-shadow: var(--cs-shadow-1, 0 1px 3px rgba(0, 0, 0, 0.1));
  overflow: hidden;
  transition: all var(--cs-transition, 0.2s ease);
  position: relative;
  
  &:hover {
    transform: translateY(-2px);
    box-shadow: var(--cs-shadow-2, 0 4px 6px rgba(0, 0, 0, 0.1));
  }
}

/* Product card with glass styling */
@utility cs-card-product-glass {
  background: var(--cs-acrylic-tint, rgba(255, 255, 255, 0.1));
  backdrop-filter: saturate(140%) blur(12px);
  border: 1px solid var(--cs-acrylic-border, rgba(255, 255, 255, 0.2));
}

/* Pricing Card Component */
@utility cs-card-pricing {
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--cs-surface);
  border: 2px solid var(--cs-border);
  border-radius: var(--cs-radius-lg);
  box-shadow: var(--cs-shadow-1);
  padding: var(--cs-space-6);
  text-align: center;
  position: relative;
  transition: all var(--cs-transition);
  
  &:hover {
    transform: translateY(-4px);
    box-shadow: var(--cs-shadow-2);
  }
}

/* Pricing card with glass styling */
@utility cs-card-pricing-glass {
  background: var(--cs-acrylic-tint, rgba(255, 255, 255, 0.1));
  backdrop-filter: saturate(140%) blur(12px);
  border: 2px solid var(--cs-acrylic-border, rgba(255, 255, 255, 0.3));
}

/* =========================================================
   v0.8.x CARD SYSTEM COMPONENTS
   Complete card system with interactive effects
   ========================================================= */

/* Card Base - v0.8.x compatible */
@utility cs-card-base {
  background: var(--cs-card-bg);
  border-radius: var(--cs-card-border-radius);
  box-shadow: var(--cs-card-shadow);
  transition: all 300ms ease;
  overflow: hidden;
  
  &:hover {
    box-shadow: var(--cs-card-shadow-hover);
    transform: translateY(var(--cs-card-hover-lift));
  }
}

/* Product Card - v0.8.x compatible */
@utility cs-card-product {
  background: var(--cs-card-bg);
  border-radius: var(--cs-card-border-radius);
  box-shadow: var(--cs-card-shadow);
  transition: all 300ms ease;
  overflow: hidden;
  max-width: 20rem;
  display: flex;
  flex-direction: column;
  
  &:hover {
    box-shadow: var(--cs-card-shadow-hover);
    transform: translateY(var(--cs-card-hover-lift));
  }
}

/* Card Image */
@utility cs-card-image {
  width: 100%;
  height: 12rem;
  object-fit: cover;
  background: color-mix(in srgb, currentColor 5%, transparent);
}

/* Card Content */
@utility cs-card-content {
  padding: var(--cs-card-padding);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Card Title */
@utility cs-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: color-mix(in srgb, currentColor 95%, transparent);
  margin: 0;
  line-height: 1.3;
}

/* Card Description */
@utility cs-card-description {
  color: color-mix(in srgb, currentColor 70%, transparent);
  line-height: 1.6;
  margin: 0;
  flex: 1;
}

/* Card Price */
@utility cs-card-price {
  font-size: 1.5rem;
  font-weight: 800;
  color: #059669;
  margin: 0;
}

/* Card Actions */
@utility cs-card-actions {
  padding: 0 var(--cs-card-padding) var(--cs-card-padding);
  display: flex;
  gap: 0.75rem;
}

/* Primary Button for Cards */
@utility cs-button-primary-card {
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 200ms ease;
  flex: 1;
  
  &:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px color-mix(in srgb, #3b82f6 40%, transparent);
  }
}

/* Testimonial Card - v0.8.x compatible */
@utility cs-card-testimonial {
  background: var(--cs-card-bg);
  border-radius: var(--cs-card-border-radius);
  box-shadow: var(--cs-card-shadow);
  transition: all 300ms ease;
  overflow: hidden;
  padding: var(--cs-card-padding);
  max-width: 24rem;
  text-align: center;
  position: relative;
  
  &:hover {
    box-shadow: var(--cs-card-shadow-hover);
    transform: translateY(var(--cs-card-hover-lift));
  }
}

/* Testimonial Quote */
@utility cs-testimonial-quote {
  font-size: 1.125rem;
  line-height: 1.6;
  font-style: italic;
  color: color-mix(in srgb, currentColor 85%, transparent);
  margin-bottom: 1.5rem;
  position: relative;
  
  &::before {
    content: '"';
    position: absolute;
    top: -0.5rem;
    left: -0.5rem;
    font-size: 3rem;
    color: color-mix(in srgb, currentColor 20%, transparent);
    line-height: 1;
  }
}

/* Testimonial Author */
@utility cs-testimonial-author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

/* Testimonial Avatar */
@utility cs-testimonial-avatar {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid color-mix(in srgb, currentColor 20%, transparent);
}

/* Testimonial Info */
@utility cs-testimonial-info {
  text-align: left;
}

/* Testimonial Name */
@utility cs-testimonial-name {
  font-weight: 600;
  color: color-mix(in srgb, currentColor 90%, transparent);
  margin: 0;
}

/* Testimonial Role */
@utility cs-testimonial-role {
  font-size: 0.875rem;
  color: color-mix(in srgb, currentColor 60%, transparent);
  margin: 0;
}

/* Testimonial with Orbs - v0.8.x compatible */
@utility cs-card-testimonial-orb {
  background: linear-gradient(135deg, 
    color-mix(in srgb, #3b82f6 10%, transparent) 0%,
    color-mix(in srgb, #8b5cf6 15%, transparent) 50%,
    color-mix(in srgb, #06b6d4 10%, transparent) 100%
  );
  backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid color-mix(in srgb, #ffffff 20%, transparent);
  border-radius: var(--cs-card-border-radius);
  transition: all 300ms ease;
  overflow: hidden;
  padding: var(--cs-card-padding);
  max-width: 24rem;
  text-align: center;
  position: relative;
  
  &:hover {
    box-shadow: var(--cs-card-shadow-hover);
    transform: translateY(var(--cs-card-hover-lift));
  }
  
  &::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, 
      color-mix(in srgb, #3b82f6 30%, transparent) 0%,
      transparent 70%
    );
    animation: cs-orb-float 6s ease-in-out infinite;
    pointer-events: none;
  }
}

/* =========================================================
   v0.8.x FORMS SYSTEM COMPONENTS
   Complete form system with validation states
   ========================================================= */

/* Form Base - v0.8.x compatible */
@utility cs-form-base {
  display: flex;
  flex-direction: column;
  gap: var(--cs-form-spacing);
}

/* Input Base - v0.8.x compatible */
@utility cs-input-base {
  padding: var(--cs-form-padding);
  border: 1px solid var(--cs-form-border-color);
  border-radius: var(--cs-form-border-radius);
  transition: var(--cs-form-transition);
  
  &:focus {
    outline: none;
    border-color: var(--cs-form-focus-color);
    box-shadow: var(--cs-form-focus-shadow) color-mix(in srgb, var(--cs-form-focus-color) 20%, transparent);
  }
}

/* Modern Form - v0.8.x compatible */
@utility cs-form-modern {
  display: flex;
  flex-direction: column;
  gap: var(--cs-form-spacing);
  max-width: 32rem;
  margin: 0 auto;
  padding: 2rem;
  background: color-mix(in srgb, #ffffff 95%, transparent);
  border-radius: 1rem;
  box-shadow: 0 10px 25px color-mix(in srgb, #000000 10%, transparent);
}

/* Modern Input - v0.8.x compatible */
@utility cs-input-modern {
  padding: var(--cs-form-padding);
  border: 2px solid color-mix(in srgb, currentColor 10%, transparent);
  border-radius: var(--cs-form-border-radius);
  transition: var(--cs-form-transition);
  background: #ffffff;
  font-size: 1rem;
  line-height: 1.5;
  
  &:focus {
    outline: none;
    border-color: var(--cs-form-focus-color);
    box-shadow: var(--cs-form-focus-shadow) color-mix(in srgb, var(--cs-form-focus-color) 20%, transparent);
  }
  
  &::placeholder {
    color: color-mix(in srgb, currentColor 60%, transparent);
  }
}

/* Modern Label - v0.8.x compatible */
@utility cs-label-modern {
  font-weight: 600;
  color: color-mix(in srgb, currentColor 90%, transparent);
  margin-bottom: 0.5rem;
  display: block;
}

/* Modern Primary Button - v0.8.x compatible */
@utility cs-button-primary-modern {
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: white;
  border: none;
  padding: 0.875rem 1.5rem;
  border-radius: var(--cs-form-border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: var(--cs-form-transition);
  
  &:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px color-mix(in srgb, #3b82f6 30%, transparent);
  }
}

/* Glass Form - v0.8.x compatible */
@utility cs-form-glass {
  display: flex;
  flex-direction: column;
  gap: var(--cs-form-spacing);
  backdrop-filter: blur(20px) saturate(180%);
  background: color-mix(in srgb, #ffffff 10%, transparent);
  border: 1px solid color-mix(in srgb, #ffffff 20%, transparent);
  border-radius: 1rem;
  padding: 2rem;
}

/* Glass Input - v0.8.x compatible */
@utility cs-input-glass {
  padding: var(--cs-form-padding);
  background: color-mix(in srgb, #ffffff 15%, transparent);
  border: 1px solid color-mix(in srgb, #ffffff 30%, transparent);
  border-radius: var(--cs-form-border-radius);
  transition: var(--cs-form-transition);
  color: inherit;
  backdrop-filter: blur(10px);
  
  &:focus {
    outline: none;
    border-color: var(--cs-form-focus-color);
    box-shadow: var(--cs-form-focus-shadow) color-mix(in srgb, var(--cs-form-focus-color) 20%, transparent);
  }
  
  &::placeholder {
    color: color-mix(in srgb, currentColor 60%, transparent);
  }
}

/* Glass Primary Button - v0.8.x compatible */
@utility cs-button-primary-glass {
  background: color-mix(in srgb, #ffffff 20%, transparent);
  border: 1px solid color-mix(in srgb, #ffffff 30%, transparent);
  backdrop-filter: blur(10px);
  color: inherit;
  padding: 0.875rem 1.5rem;
  border-radius: var(--cs-form-border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: var(--cs-form-transition);
  
  &:hover {
    background: color-mix(in srgb, #ffffff 30%, transparent);
    transform: translateY(-1px);
  }
}

/* Form Group - v0.8.x compatible */
@utility cs-form-group {
  position: relative;
  margin-bottom: var(--cs-form-spacing);
}

/* Input Validation States - v0.8.x compatible */
@utility cs-input-validation {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 0.25rem;
  font-size: 0.875rem;
  display: none;
  align-items: center;
  gap: 0.25rem;
}

@utility cs-validation-error {
  display: flex;
  color: var(--cs-form-error-color);
}

@utility cs-validation-success {
  display: flex;
  color: var(--cs-form-success-color);
}

@utility cs-validation-icon {
  font-size: 1rem;
  line-height: 1;
}

@utility cs-input-error {
  border-color: var(--cs-form-error-color) !important;
  box-shadow: var(--cs-form-focus-shadow) color-mix(in srgb, var(--cs-form-error-color) 20%, transparent) !important;
}

@utility cs-input-success {
  border-color: var(--cs-form-success-color) !important;
  box-shadow: var(--cs-form-focus-shadow) color-mix(in srgb, var(--cs-form-success-color) 20%, transparent) !important;
}

/* Additional Form Utilities */
@utility cs-input-group {
  position: relative;
  display: flex;
  align-items: stretch;
}

@utility cs-input-addon {
  display: flex;
  align-items: center;
  padding: 0 0.75rem;
  background: color-mix(in srgb, currentColor 5%, transparent);
  border: 1px solid var(--cs-form-border-color);
  color: color-mix(in srgb, currentColor 70%, transparent);
  font-size: 0.875rem;
}

@utility cs-input-addon-left {
  border-right: none;
  border-radius: var(--cs-form-border-radius) 0 0 var(--cs-form-border-radius);
}

@utility cs-input-addon-right {
  border-left: none;
  border-radius: 0 var(--cs-form-border-radius) var(--cs-form-border-radius) 0;
}

@utility cs-input-with-addon-left {
  border-radius: 0 var(--cs-form-border-radius) var(--cs-form-border-radius) 0;
  border-left: none;
}

@utility cs-input-with-addon-right {
  border-radius: var(--cs-form-border-radius) 0 0 var(--cs-form-border-radius);
  border-right: none;
}

@utility cs-form-row {
  display: flex;
  gap: var(--cs-form-spacing);
  align-items: flex-start;
}

@utility cs-form-col {
  flex: 1;
  min-width: 0;
}

/* =========================================================
   NAVIGATION COMPONENTS
   Navbar, Tabs, Pills, Drawer, Breadcrumbs
   ========================================================= */

/* Navbar Component */
@utility cs-navbar {
  position: relative;
  z-index: var(--cs-z-nav);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--cs-space-2);
  padding: var(--cs-space-2) var(--cs-space-4);
  background-color: var(--cs-color-bg);
  border-bottom: 1px solid var(--cs-color-border);
  
  &.cs-navbar--acrylic {
    background-color: var(--cs-acrylic-bg);
    border-bottom: 1px solid var(--cs-acrylic-border);
  }
  
  @supports ((-webkit-backdrop-filter: blur(6px)) or (backdrop-filter: blur(6px))) {
    &.cs-navbar--acrylic { -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
  }
}

/* Brand Component */
@utility cs-navbar-brand {
  display: inline-block;
  padding-top: calc(0.3125rem * var(--cs-density));
  padding-bottom: calc(0.3125rem * var(--cs-density));
  margin-right: var(--cs-space-4);
  font-size: 1.25rem;
  line-height: inherit;
  white-space: nowrap;
  text-decoration: none;
  color: inherit;
}

/* Navigation Tabs */
@utility cs-nav-tabs {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--cs-color-border);
  
  & .cs-nav-list {
    display: flex;
    flex-wrap: wrap;
    margin: 0;
    padding: 0;
    list-style: none;
  }
  
  & .cs-nav-item { display: flex; margin-bottom: -1px; }
  
  & .cs-nav-link {
    display: inline-block;
    padding: var(--cs-space-3) var(--cs-space-4);
    color: var(--cs-color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    border: 1px solid transparent;
    border-bottom: none;
    border-top-left-radius: var(--cs-radius-md);
    border-top-right-radius: var(--cs-radius-md);
    transition: all var(--cs-transition-fast) var(--cs-ease-out);
    white-space: nowrap;
    position: relative;
    
    &:hover { 
      color: var(--cs-color-text); 
      border-color: var(--cs-color-border-light); 
      background-color: var(--cs-color-bg-hover); 
    }
  }
  
  & .cs-nav-item.cs-nav-item--active .cs-nav-link {
    color: var(--cs-color-primary);
    background-color: var(--cs-color-bg);
    border-color: var(--cs-color-border) var(--cs-color-border) var(--cs-color-bg);
    
    &::after { 
      content: ''; 
      position: absolute; 
      bottom: -1px; 
      left: 0; 
      right: 0; 
      height: 2px; 
      background-color: var(--cs-color-primary); 
    }
  }
}

/* Tab Content */
@utility cs-tab-content { 
  display: none; 
  padding: var(--cs-space-4); 
  animation: cs-tab-switch var(--cs-transition-base) var(--cs-ease-out); 
}

@utility cs-tab-content--active { 
  display: block; 
}

/* Drawer Component */
@utility cs-drawer {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--cs-z-drawer);
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  max-width: 320px;
  background-color: var(--cs-color-bg);
  box-shadow: var(--cs-shadow-xl);
  transform: translateX(-100%);
  transition: transform var(--cs-transition-fast) var(--cs-ease-out);
  
  &[open], &.cs-is-open { 
    transform: translateX(0); 
  }
  
  &.cs-drawer--right { 
    left: auto; 
    right: 0; 
    transform: translateX(100%); 
    
    &[open], &.cs-is-open { 
      transform: translateX(0); 
    }
  }
}

@utility cs-drawer-header { 
  padding: var(--cs-space-4); 
  border-bottom: 1px solid var(--cs-color-border); 
}

@utility cs-drawer-body { 
  flex: 1; 
  padding: var(--cs-space-4); 
  overflow-y: auto; 
}

@utility cs-drawer-footer { 
  padding: var(--cs-space-4); 
  border-top: 1px solid var(--cs-color-border); 
}

@utility cs-drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  z-index: calc(var(--cs-z-drawer) - 1);
  width: 100%;
  height: 100%;
  background-color: var(--cs-backdrop-bg);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--cs-transition-fast) var(--cs-ease-out), 
              visibility var(--cs-transition-fast) var(--cs-ease-out);
}

/* Open state sibling backdrop */
@utility cs-drawer { 
  &[open] ~ .cs-drawer-backdrop, 
  &.cs-is-open ~ .cs-drawer-backdrop { 
    opacity: 1; 
    visibility: visible; 
  } 
}

/* =========================================================
   RESPONSIVE GLASS UTILITIES
   Container queries and responsive glass blur effects
   ========================================================= */

/* 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;
}

/* =========================================================
   GLASS-FIRST FALLBACKS & PERFORMANCE
   Fallback optimizations for legacy browsers
   ========================================================= */

/* 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-prici