/* ========================================= */
/* COMPREHENSIVE RESPONSIVE FOUNDATION       */
/* ========================================= */

/* Root Variables - Consistent across all pages */
:root {
  /* Breakpoints */
  --mobile-max: 480px;
  --tablet-max: 768px;
  --desktop-min: 769px;
  --large-desktop-min: 1200px;
  
  /* Responsive Spacing Scale */
  --space-xs: clamp(0.25rem, 2vw, 0.5rem);
  --space-sm: clamp(0.5rem, 3vw, 1rem);
  --space-md: clamp(1rem, 4vw, 1.5rem);
  --space-lg: clamp(1.5rem, 5vw, 2.5rem);
  --space-xl: clamp(2rem, 6vw, 4rem);
  --space-2xl: clamp(3rem, 8vw, 6rem);
  
  /* Responsive Typography Scale */
  --text-xs: clamp(0.75rem, 2.5vw, 0.875rem);
  --text-sm: clamp(0.875rem, 3vw, 1rem);
  --text-base: clamp(1rem, 3.5vw, 1.125rem);
  --text-lg: clamp(1.125rem, 4vw, 1.25rem);
  --text-xl: clamp(1.25rem, 4.5vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 5vw, 2rem);
  --text-3xl: clamp(2rem, 6vw, 2.5rem);
  --text-4xl: clamp(2.5rem, 7vw, 3rem);
  
  /* Touch-Friendly Sizing */
  --touch-target: 44px;
  --touch-target-sm: 36px;
  --touch-target-lg: 52px;
  
  /* Button Heights */
  --button-height-xs: 28px;
  --button-height-sm: 36px;
  --button-height-md: 44px;
  --button-height-lg: 52px;
  --button-height-xl: 60px;
  
  /* Border Radius Scale */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;
  
  /* Shadow Scale */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
  
  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;
}

/* ========================================= */
/* RESPONSIVE GRID SYSTEM                    */
/* ========================================= */

/* Container System */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--space-sm);
}

.container-sm {
  max-width: 640px;
}

.container-md {
  max-width: 768px;
}

.container-lg {
  max-width: 1024px;
}

.container-xl {
  max-width: 1280px;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-md);
}

.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)); }

/* Responsive Grid */
.grid-responsive {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-responsive-sm {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.grid-responsive-lg {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

/* ========================================= */
/* RESPONSIVE FLEXBOX SYSTEM                 */
/* ========================================= */

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }

/* Flex 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; }

/* Flex Grow/Shrink */
.flex-1 { flex: 1 1 0%; }
.flex-auto { flex: 1 1 auto; }
.flex-initial { flex: 0 1 auto; }
.flex-none { flex: none; }

/* ========================================= */
/* RESPONSIVE SPACING SYSTEM                 */
/* ========================================= */

/* Margin Utilities */
.m-0 { margin: 0; }
.m-auto { margin: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }
.my-auto { margin-top: auto; margin-bottom: auto; }

.m-xs { margin: var(--space-xs); }
.m-sm { margin: var(--space-sm); }
.m-md { margin: var(--space-md); }
.m-lg { margin: var(--space-lg); }
.m-xl { margin: var(--space-xl); }

.mt-xs { margin-top: var(--space-xs); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-xs { margin-bottom: var(--space-xs); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.ml-xs { margin-left: var(--space-xs); }
.ml-sm { margin-left: var(--space-sm); }
.ml-md { margin-left: var(--space-md); }
.ml-lg { margin-left: var(--space-lg); }
.ml-xl { margin-left: var(--space-xl); }

.mr-xs { margin-right: var(--space-xs); }
.mr-sm { margin-right: var(--space-sm); }
.mr-md { margin-right: var(--space-md); }
.mr-lg { margin-right: var(--space-lg); }
.mr-xl { margin-right: var(--space-xl); }

/* Padding Utilities */
.p-0 { padding: 0; }
.p-xs { padding: var(--space-xs); }
.p-sm { padding: var(--space-sm); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }

.px-xs { padding-left: var(--space-xs); padding-right: var(--space-xs); }
.px-sm { padding-left: var(--space-sm); padding-right: var(--space-sm); }
.px-md { padding-left: var(--space-md); padding-right: var(--space-md); }
.px-lg { padding-left: var(--space-lg); padding-right: var(--space-lg); }
.px-xl { padding-left: var(--space-xl); padding-right: var(--space-xl); }

.py-xs { padding-top: var(--space-xs); padding-bottom: var(--space-xs); }
.py-sm { padding-top: var(--space-sm); padding-bottom: var(--space-sm); }
.py-md { padding-top: var(--space-md); padding-bottom: var(--space-md); }
.py-lg { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.py-xl { padding-top: var(--space-xl); padding-bottom: var(--space-xl); }

/* ========================================= */
/* RESPONSIVE TYPOGRAPHY SYSTEM              */
/* ========================================= */

.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }

.font-thin { font-weight: 100; }
.font-light { font-weight: 300; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.font-black { font-weight: 900; }

.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-justify { text-align: justify; }

.leading-tight { line-height: 1.25; }
.leading-snug { line-height: 1.375; }
.leading-normal { line-height: 1.5; }
.leading-relaxed { line-height: 1.625; }
.leading-loose { line-height: 2; }

/* ========================================= */
/* RESPONSIVE COMPONENT SYSTEM               */
/* ========================================= */

/* Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: var(--button-height-md);
  padding: 0 var(--space-md);
  font-size: var(--text-base);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-xs {
  min-height: var(--button-height-xs);
  padding: 0 var(--space-sm);
  font-size: var(--text-xs);
}

.btn-sm {
  min-height: var(--button-height-sm);
  padding: 0 var(--space-sm);
  font-size: var(--text-sm);
}

.btn-lg {
  min-height: var(--button-height-lg);
  padding: 0 var(--space-lg);
  font-size: var(--text-lg);
}

.btn-xl {
  min-height: var(--button-height-xl);
  padding: 0 var(--space-xl);
  font-size: var(--text-xl);
}

.btn-primary {
  background: #3b82f6;
  color: white;
}

.btn-primary:hover {
  background: #2563eb;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: #f3f4f6;
  color: #374151;
  border: 1px solid #d1d5db;
}

.btn-secondary:hover {
  background: #e5e7eb;
}

.btn-outline {
  background: transparent;
  color: #3b82f6;
  border: 2px solid #3b82f6;
}

.btn-outline:hover {
  background: #3b82f6;
  color: white;
}

/* Card System */
.card {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--space-lg);
  border-bottom: 1px solid #e5e7eb;
}

.card-body {
  padding: var(--space-lg);
}

.card-footer {
  padding: var(--space-lg);
  border-top: 1px solid #e5e7eb;
  background: #f9fafb;
}

/* Form System */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: #374151;
  font-size: var(--text-sm);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  min-height: var(--touch-target);
  padding: var(--space-sm) var(--space-md);
  border: 2px solid #e5e7eb;
  border-radius: var(--radius-md);
  font-size: 16px; /* Prevents zoom on iOS */
  font-family: inherit;
  transition: all 0.2s ease;
  background: white;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

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

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

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

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

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

/* Width Utilities */
.w-full { width: 100%; }
.w-auto { width: auto; }
.w-fit { width: fit-content; }
.w-max { width: max-content; }
.w-min { width: min-content; }

/* Height Utilities */
.h-full { height: 100%; }
.h-auto { height: auto; }
.h-fit { height: fit-content; }
.h-max { height: max-content; }
.h-min { height: min-content; }
.h-screen { height: 100vh; }

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

/* Mobile First - Show on mobile, hide on larger screens */
.mobile-only {
  display: block;
}

.tablet-only,
.desktop-only {
  display: none;
}

/* Tablet and up - Show on tablet and desktop */
@media (min-width: 481px) {
  .mobile-only {
    display: none;
  }
  
  .tablet-only {
    display: block;
  }
}

/* Desktop only - Show only on desktop */
@media (min-width: 769px) {
  .tablet-only {
    display: none;
  }
  
  .desktop-only {
    display: block;
  }
}

/* Hide on specific breakpoints */
@media (max-width: 480px) {
  .mobile-hidden {
    display: none !important;
  }
}

@media (min-width: 481px) and (max-width: 768px) {
  .tablet-hidden {
    display: none !important;
  }
}

@media (min-width: 769px) {
  .desktop-hidden {
    display: none !important;
  }
}

/* ========================================= */
/* RESPONSIVE GRID BREAKPOINTS               */
/* ========================================= */

/* Mobile Grid */
@media (max-width: 480px) {
  .grid-responsive {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
  
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-5,
  .grid-cols-6 {
    grid-template-columns: 1fr;
  }
}

/* Tablet Grid */
@media (min-width: 481px) and (max-width: 768px) {
  .grid-responsive {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
  }
  
  .grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-5,
  .grid-cols-6 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Desktop Grid */
@media (min-width: 769px) {
  .grid-responsive {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
  }
  
  .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));
  }
}

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

/* Focus styles */
.focus-visible:focus {
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
}

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

/* High contrast mode */
@media (prefers-contrast: high) {
  .btn-primary {
    background: #000;
    color: #fff;
    border: 2px solid #000;
  }
  
  .btn-secondary {
    background: #fff;
    color: #000;
    border: 2px solid #000;
  }
  
  .card {
    border: 2px solid #000;
  }
}

/* ========================================= */
/* PRINT STYLES                              */
/* ========================================= */

@media print {
  .no-print {
    display: none !important;
  }
  
  .print-only {
    display: block !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  .card {
    box-shadow: none !important;
    border: 1px solid #000 !important;
  }
}