/*
 * Base CSS - Modern E-Commerce Electronics Store
 * Futuristic, high-tech, sophisticated design system
 */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
  /* Color Palette - High-tech & Futuristic */
  --color-midnight-blue: #0a1628;
  --color-deep-blue: #1a2942;
  --color-graphite-black: #18191c;
  --color-neon-cyan: #00f0ff;
  --color-cyan-glow: #00d9ff;
  --color-cyan-dark: #00b8d4;
  --color-silver-metallic: #c0c5ce;
  --color-silver-light: #e8eaed;
  --color-white: #ffffff;
  --color-off-white: #f8f9fa;
  
  /* Semantic Colors */
  --color-background: var(--color-midnight-blue);
  --color-background-secondary: var(--color-deep-blue);
  --color-background-card: var(--color-graphite-black);
  --color-text: var(--color-silver-light);
  --color-text-secondary: var(--color-silver-metallic);
  --color-text-muted: #8a9099;
  --color-heading: var(--color-white);
  --color-primary: var(--color-neon-cyan);
  --color-primary-hover: var(--color-cyan-glow);
  --color-primary-active: var(--color-cyan-dark);
  --color-success: #00ff88;
  --color-warning: #ffb800;
  --color-danger: #ff3366;
  --color-info: #4d9fff;
  
  /* Neutral Grays */
  --color-gray-50: #f8f9fa;
  --color-gray-100: #e8eaed;
  --color-gray-200: #c0c5ce;
  --color-gray-300: #9ca3af;
  --color-gray-400: #6b7280;
  --color-gray-500: #4b5563;
  --color-gray-600: #374151;
  --color-gray-700: #1f2937;
  --color-gray-800: #18191c;
  --color-gray-900: #0f1419;
  
  /* Typography */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Helvetica Neue', sans-serif;
  --font-family-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  --font-family-mono: 'Courier New', Courier, monospace;
  
  /* Font Sizes */
  --font-size-xs: 0.75rem;     /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;    /* 18px */
  --font-size-xl: 1.25rem;     /* 20px */
  --font-size-2xl: 1.5rem;     /* 24px */
  --font-size-3xl: 1.875rem;   /* 30px */
  --font-size-4xl: 2.25rem;    /* 36px */
  --font-size-5xl: 3rem;       /* 48px */
  --font-size-6xl: 3.75rem;    /* 60px */
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Letter Spacing */
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;
  
  /* Spacing Scale */
  --space-0: 0;
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  
  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.25rem;   /* 4px */
  --radius-base: 0.5rem;  /* 8px */
  --radius-md: 0.75rem;   /* 12px */
  --radius-lg: 1rem;      /* 16px */
  --radius-xl: 1.5rem;    /* 24px */
  --radius-2xl: 2rem;     /* 32px */
  --radius-full: 9999px;
  
  /* Shadows - Futuristic Glow Effects */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-base: 0 2px 4px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 8px 0 rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 16px 0 rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 12px 24px 0 rgba(0, 0, 0, 0.7);
  --shadow-2xl: 0 20px 40px 0 rgba(0, 0, 0, 0.8);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.4);
  
  /* Glow Effects */
  --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.5), 0 0 40px rgba(0, 240, 255, 0.3);
  --glow-cyan-strong: 0 0 30px rgba(0, 240, 255, 0.7), 0 0 60px rgba(0, 240, 255, 0.5);
  --glow-cyan-subtle: 0 0 10px rgba(0, 240, 255, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  --transition-slower: 500ms ease-in-out;
  
  /* Z-index Scale */
  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;
  
  /* Layout */
  --container-max-width: 1400px;
  --container-padding: var(--space-6);
  --header-height: 80px;
  
  /* Borders */
  --border-width: 1px;
  --border-width-thick: 2px;
  --border-color: rgba(192, 197, 206, 0.15);
  --border-color-light: rgba(255, 255, 255, 0.1);
  --border-color-cyan: rgba(0, 240, 255, 0.3);
}

/* ============================================
   RESET / NORMALIZE
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  line-height: var(--line-height-normal);
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

img {
  border-style: none;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

a {
  text-decoration: none;
  color: inherit;
}

fieldset {
  border: 0;
  padding: 0;
  margin: 0;
  min-width: 0;
}

legend {
  padding: 0;
}

/* ============================================
   BASE STYLES
   ============================================ */
body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(0, 240, 255, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(0, 240, 255, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-heading);
  margin-bottom: var(--space-4);
  letter-spacing: var(--letter-spacing-tight);
}

h1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-extrabold);
  margin-bottom: var(--space-6);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
}

h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-5);
}

h3 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-4);
}

h4 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
}

h5 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
}

h6 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

@media (max-width: 768px) {
  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-3xl); }
  h3 { font-size: var(--font-size-2xl); }
  h4 { font-size: var(--font-size-xl); }
  h5 { font-size: var(--font-size-lg); }
  h6 { font-size: var(--font-size-base); }
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text);
  line-height: var(--line-height-relaxed);
}

p:last-child {
  margin-bottom: 0;
}

strong, b {
  font-weight: var(--font-weight-bold);
  color: var(--color-heading);
}

em, i {
  font-style: italic;
}

small {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

mark {
  background-color: var(--color-primary);
  color: var(--color-midnight-blue);
  padding: 0.125rem 0.25rem;
  border-radius: var(--radius-sm);
}

code, kbd, samp, pre {
  font-family: var(--font-family-mono);
  font-size: 0.9em;
}

code {
  background-color: var(--color-background-card);
  color: var(--color-primary);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

pre {
  background-color: var(--color-background-card);
  padding: var(--space-4);
  border-radius: var(--radius-base);
  overflow-x: auto;
  border: 1px solid var(--border-color);
}

blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--space-4);
  margin: var(--space-6) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

hr {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: var(--space-8) 0;
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

a:hover {
  color: var(--color-primary-hover);
}

a:active {
  color: var(--color-primary-active);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Lists */
ul, ol {
  margin-bottom: var(--space-4);
}

ul ul, ul ol, ol ul, ol ol {
  margin-bottom: 0;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.container-fluid {
  width: 100%;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

@media (max-width: 768px) {
  .container,
  .container-fluid {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
}

/* Flexbox Utilities */
.flex {
  display: flex;
}

.flex-inline {
  display: inline-flex;
}

.flex-row {
  flex-direction: row;
}

.flex-row-reverse {
  flex-direction: row-reverse;
}

.flex-col {
  flex-direction: column;
}

.flex-col-reverse {
  flex-direction: column-reverse;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-nowrap {
  flex-wrap: nowrap;
}

.flex-1 {
  flex: 1 1 0%;
}

.flex-auto {
  flex: 1 1 auto;
}

.flex-none {
  flex: none;
}

/* Alignment */
.items-start {
  align-items: flex-start;
}

.items-center {
  align-items: center;
}

.items-end {
  align-items: flex-end;
}

.items-stretch {
  align-items: stretch;
}

.justify-start {
  justify-content: flex-start;
}

.justify-center {
  justify-content: center;
}

.justify-end {
  justify-content: flex-end;
}

.justify-between {
  justify-content: space-between;
}

.justify-around {
  justify-content: space-around;
}

.justify-evenly {
  justify-content: space-evenly;
}

/* Grid Utilities */
.grid {
  display: grid;
}

.grid-cols-1 {
  grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-cols-5 {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.grid-cols-6 {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }
.gap-12 { gap: var(--space-12); }

@media (max-width: 1024px) {
  .grid-cols-4,
  .grid-cols-5,
  .grid-cols-6 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-5,
  .grid-cols-6 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-5,
  .grid-cols-6 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }
}

/* Text Utilities */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-justify { text-align: justify; }

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.uppercase { text-transform: uppercase; }
.lowercase { text-transform: lowercase; }
.capitalize { text-transform: capitalize; }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-white { color: var(--color-white); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }

/* Spacing Utilities */
.m-0 { margin: 0; }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-5 { margin: var(--space-5); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

/* Display Utilities */
.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }
.hidden { display: none; }

/* Position Utilities */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

/* Overflow Utilities */
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-scroll { overflow: scroll; }

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Visibility Utilities */
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Opacity Utilities */
.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }

/* ============================================
   COMPONENT STYLES
   ============================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-normal);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  border: var(--border-width-thick) solid transparent;
  border-radius: var(--radius-base);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Variants */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-cyan-dark) 100%);
  color: var(--color-midnight-blue)!important;
  border-color: var(--color-primary);
  box-shadow: var(--glow-cyan-subtle);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-hover) 0%, var(--color-primary) 100%);
  box-shadow: var(--glow-cyan);
}

.btn-primary:active {
  background: var(--color-cyan-dark);
}

.btn-secondary {
  background-color: var(--color-graphite-black);
  color: var(--color-white);
  border-color: var(--color-silver-metallic);
}

.btn-secondary:hover {
  background-color: var(--color-deep-blue);
  border-color: var(--color-primary);
  box-shadow: var(--glow-cyan-subtle);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-midnight-blue);
  box-shadow: var(--glow-cyan-subtle);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: transparent;
}

.btn-ghost:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--color-primary);
}

.btn-success {
  background-color: var(--color-success);
  color: var(--color-midnight-blue);
  border-color: var(--color-success);
}

.btn-success:hover {
  background-color: #00dd77;
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.4);
}

.btn-danger {
  background-color: var(--color-danger);
  color: var(--color-white);
  border-color: var(--color-danger);
}

.btn-danger:hover {
  background-color: #ff1a55;
  box-shadow: 0 0 20px rgba(255, 51, 102, 0.4);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* Form Inputs */
.input,
.textarea,
.select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background-card);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-base);
  transition: all var(--transition-base);
  outline: none;
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-muted);
}

.input:hover,
.textarea:hover,
.select:hover {
  border-color: var(--color-silver-metallic);
}

.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.1), var(--glow-cyan-subtle);
}

.input:focus-visible,
.textarea:focus-visible,
.select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.input:disabled,
.textarea:disabled,
.select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--color-gray-800);
}

.input.error,
.textarea.error,
.select.error {
  border-color: var(--color-danger);
}

.input.success,
.textarea.success,
.select.success {
  border-color: var(--color-success);
}

.textarea {
  min-height: 120px;
  resize: vertical;
}

.select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='%2300f0ff' d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  background-size: 16px;
  padding-right: var(--space-10);
}

/* Form Labels */
.label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

.label.required::after {
  content: ' *';
  color: var(--color-danger);
}

/* Checkbox & Radio */
.checkbox,
.radio {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.checkbox input,
.radio input {
  width: 20px;
  height: 20px;
  margin-right: var(--space-2);
  cursor: pointer;
  accent-color: var(--color-primary);
}

/* Card Component */
.card {
  background-color: var(--color-background-card);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  border-color: var(--border-color-cyan);
  box-shadow: var(--shadow-lg), var(--glow-cyan-subtle);
  transform: translateY(-4px);
}

.card:hover::before {
  opacity: 1;
}

.card-header {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-width) solid var(--border-color);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-heading);
  margin-bottom: var(--space-2);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

.card-body {
  color: var(--color-text);
}

.card-footer {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: var(--border-width) solid var(--border-color);
}

/* Card Variants */
.card-flat {
  background-color: transparent;
  border: none;
  box-shadow: none;
}

.card-elevated {
  box-shadow: var(--shadow-xl);
}

.card-glow {
  border-color: var(--border-color-cyan);
  box-shadow: var(--shadow-lg), var(--glow-cyan-subtle);
}

/* Badge Component */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary {
  background-color: var(--color-primary);
  color: var(--color-midnight-blue);
}

.badge-secondary {
  background-color: var(--color-silver-metallic);
  color: var(--color-midnight-blue);
}

.badge-success {
  background-color: var(--color-success);
  color: var(--color-midnight-blue);
}

.badge-warning {
  background-color: var(--color-warning);
  color: var(--color-midnight-blue);
}

.badge-danger {
  background-color: var(--color-danger);
  color: var(--color-white);
}

.badge-outline {
  background-color: transparent;
  border: var(--border-width) solid var(--color-primary);
  color: var(--color-primary);
}

/* Alert Component */
.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-base);
  border-left: 4px solid;
  margin-bottom: var(--space-4);
  background-color: var(--color-background-card);
}

.alert-info {
  border-color: var(--color-info);
  color: var(--color-info);
}

.alert-success {
  border-color: var(--color-success);
  color: var(--color-success);
}

.alert-warning {
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.alert-danger {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

/* Divider */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-color), transparent);
  margin: var(--space-8) 0;
  border: none;
}

.divider-cyan {
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0.3;
}

/* Image Component */
.img-responsive {
  max-width: 100%;
  height: auto;
  display: block;
}

.img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-contain {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

/* Focus Styles */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.2);
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .card:hover {
    transform: none;
  }
  
  .btn:hover {
    transform: none;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --border-color: var(--color-silver-metallic);
    --border-color-light: var(--color-silver-metallic);
  }
  
  .btn {
    border-width: 2px;
  }
  
  .card {
    border-width: 2px;
  }
}

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

/* Mobile First Breakpoints */
@media (max-width: 640px) {
  .hidden-mobile { display: none; }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .hidden-tablet { display: none; }
}

@media (min-width: 1025px) {
  .hidden-desktop { display: none; }
}

@media (min-width: 641px) {
  .mobile-only { display: none; }
}

@media (max-width: 640px) {
  .desktop-only { display: none; }
}