/* ===================================================
   Responsive Design System
   Unified breakpoints and responsive utilities
   =================================================== */

/* ===== Breakpoint System ===== */
:root {
  /* Standard Breakpoints */
  --breakpoint-xs: 480px;   /* Small phones */
  --breakpoint-sm: 640px;   /* Large phones */
  --breakpoint-md: 768px;   /* Tablets */
  --breakpoint-lg: 1024px;  /* Small laptops */
  --breakpoint-xl: 1280px;  /* Desktops */
  --breakpoint-2xl: 1536px; /* Large screens */
  
  /* Container Widths */
  --container-xs: 100%;
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
  
  /* Fluid Typography Scale */
  /* Using clamp(min, preferred, max) for responsive text */
  --fluid-text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --fluid-text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --fluid-text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --fluid-text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.5rem);
  --fluid-text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.875rem);
  --fluid-text-2xl: clamp(1.5rem, 1.2rem + 1.5vw, 2.25rem);
  --fluid-text-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 3rem);
  --fluid-text-4xl: clamp(2.25rem, 1.8rem + 2.25vw, 3.75rem);
  --fluid-text-5xl: clamp(3rem, 2.4rem + 3vw, 4.5rem);
  
  /* Fluid Spacing Scale */
  --fluid-space-xs: clamp(0.25rem, 0.2rem + 0.25vw, 0.5rem);
  --fluid-space-sm: clamp(0.5rem, 0.4rem + 0.5vw, 0.75rem);
  --fluid-space-md: clamp(1rem, 0.8rem + 1vw, 1.5rem);
  --fluid-space-lg: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
  --fluid-space-xl: clamp(2rem, 1.6rem + 2vw, 3rem);
  --fluid-space-2xl: clamp(3rem, 2.4rem + 3vw, 4rem);
  --fluid-space-3xl: clamp(4rem, 3.2rem + 4vw, 6rem);
  
  /* Grid Configuration */
  --grid-columns: 12;
  --grid-gap-mobile: 1rem;
  --grid-gap-tablet: 1.5rem;
  --grid-gap-desktop: 2rem;
  
  /* Touch Target Sizes */
  --touch-target-min: 44px; /* iOS minimum */
  --touch-target-recommended: 48px; /* Material Design recommendation */
  
  /* Z-Index Layers */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
  --z-notification: 800;
}

/* ===== Container System ===== */
.container {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--fluid-space-md);
}

@media (min-width: 480px) {
  .container { max-width: var(--container-xs); }
}

@media (min-width: 640px) {
  .container { max-width: var(--container-sm); }
}

@media (min-width: 768px) {
  .container { 
    max-width: var(--container-md);
    padding-inline: var(--fluid-space-lg);
  }
}

@media (min-width: 1024px) {
  .container { max-width: var(--container-lg); }
}

@media (min-width: 1280px) {
  .container { 
    max-width: var(--container-xl);
    padding-inline: var(--fluid-space-xl);
  }
}

@media (min-width: 1536px) {
  .container { max-width: var(--container-2xl); }
}

/* ===== Responsive Grid System ===== */
.grid {
  display: grid;
  gap: var(--grid-gap-mobile);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid-cols-6 { grid-template-columns: repeat(6, 1fr); }
.grid-cols-12 { grid-template-columns: repeat(12, 1fr); }

/* Auto-fit responsive grid */
.grid-auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}

.grid-auto-fill {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
}

/* Tablet breakpoint */
@media (min-width: 768px) {
  .grid { gap: var(--grid-gap-tablet); }
  
  .md\:grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
  .md\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
  .md\:grid-cols-6 { grid-template-columns: repeat(6, 1fr); }
  .md\:grid-cols-12 { grid-template-columns: repeat(12, 1fr); }
}

/* Desktop breakpoint */
@media (min-width: 1024px) {
  .grid { gap: var(--grid-gap-desktop); }
  
  .lg\:grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
  .lg\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
  .lg\:grid-cols-6 { grid-template-columns: repeat(6, 1fr); }
  .lg\:grid-cols-12 { grid-template-columns: repeat(12, 1fr); }
}

/* ===== Flexbox Utilities ===== */
.flex { display: flex; }
.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }

.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; }

.gap-xs { gap: var(--fluid-space-xs); }
.gap-sm { gap: var(--fluid-space-sm); }
.gap-md { gap: var(--fluid-space-md); }
.gap-lg { gap: var(--fluid-space-lg); }
.gap-xl { gap: var(--fluid-space-xl); }

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

@media (min-width: 640px) {
  .sm\:hidden { display: none; }
  .sm\:block { display: block; }
  .sm\:inline-block { display: inline-block; }
  .sm\:flex { display: flex; }
  .sm\:grid { display: grid; }
}

@media (min-width: 768px) {
  .md\:hidden { display: none; }
  .md\:block { display: block; }
  .md\:inline-block { display: inline-block; }
  .md\:flex { display: flex; }
  .md\:grid { display: grid; }
}

@media (min-width: 1024px) {
  .lg\:hidden { display: none; }
  .lg\:block { display: block; }
  .lg\:inline-block { display: inline-block; }
  .lg\:flex { display: flex; }
  .lg\:grid { display: grid; }
}

/* ===== Responsive Typography ===== */
.text-fluid-xs { font-size: var(--fluid-text-xs); }
.text-fluid-sm { font-size: var(--fluid-text-sm); }
.text-fluid-base { font-size: var(--fluid-text-base); }
.text-fluid-lg { font-size: var(--fluid-text-lg); }
.text-fluid-xl { font-size: var(--fluid-text-xl); }
.text-fluid-2xl { font-size: var(--fluid-text-2xl); }
.text-fluid-3xl { font-size: var(--fluid-text-3xl); }
.text-fluid-4xl { font-size: var(--fluid-text-4xl); }
.text-fluid-5xl { font-size: var(--fluid-text-5xl); }

/* Responsive line height */
.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: 1.75; }

/* ===== Responsive Spacing ===== */
.p-fluid-xs { padding: var(--fluid-space-xs); }
.p-fluid-sm { padding: var(--fluid-space-sm); }
.p-fluid-md { padding: var(--fluid-space-md); }
.p-fluid-lg { padding: var(--fluid-space-lg); }
.p-fluid-xl { padding: var(--fluid-space-xl); }

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

/* ===== Responsive Images ===== */
.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;
}

/* Aspect ratio containers */
.aspect-square { aspect-ratio: 1 / 1; }
.aspect-video { aspect-ratio: 16 / 9; }
.aspect-4-3 { aspect-ratio: 4 / 3; }
.aspect-3-2 { aspect-ratio: 3 / 2; }
.aspect-golden { aspect-ratio: 1.618 / 1; }

/* ===== Touch-Friendly Elements ===== */
.touch-target {
  min-width: var(--touch-target-recommended);
  min-height: var(--touch-target-recommended);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ===== Responsive Tables ===== */
.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table-responsive table {
  min-width: 100%;
}

/* Stack table on mobile */
@media (max-width: 767px) {
  .table-stack thead {
    display: none;
  }
  
  .table-stack tr {
    display: block;
    margin-bottom: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
  }
  
  .table-stack td {
    display: block;
    text-align: right;
    padding: 0.5rem 1rem;
    position: relative;
    padding-left: 50%;
  }
  
  .table-stack td::before {
    content: attr(data-label);
    position: absolute;
    left: 1rem;
    width: 45%;
    text-align: left;
    font-weight: bold;
  }
}

/* ===== Print Styles ===== */
@media print {
  .no-print {
    display: none !important;
  }
  
  .print-break-before {
    page-break-before: always;
  }
  
  .print-break-after {
    page-break-after: always;
  }
  
  .print-avoid-break {
    page-break-inside: avoid;
  }
}

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

.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* Focus visible for keyboard navigation */
.focus-visible:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@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;
  }
}