/* ===============================================
   PROFESSIONAL-GRADE CSS ENHANCEMENTS
   Modern responsive design system with advanced breakpoints
   =============================================== */

/* ===== CSS CUSTOM PROPERTIES (CSS VARIABLES) ===== */
:root {
  /* Professional Breakpoints */
  --bp-xs: 480px;
  --bp-sm: 768px;
  --bp-md: 1024px;
  --bp-lg: 1280px;
  --bp-xl: 1440px;
  --bp-xxl: 1920px;
  
  /* Container Sizes */
  --container-xs: 100%;
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-xxl: 1536px;
  
  /* Spacing Scale (8pt grid) */
  --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 */
  --space-32: 8rem;    /* 128px */
  
  /* Typography Scale */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 1.875rem;   /* 30px */
  --text-4xl: 2.25rem;    /* 36px */
  --text-5xl: 3rem;       /* 48px */
  --text-6xl: 3.75rem;    /* 60px */
  --text-7xl: 4.5rem;     /* 72px */
  
  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;
  
  /* Border Radius */
  --radius-sm: 0.125rem;   /* 2px */
  --radius-md: 0.25rem;    /* 4px */
  --radius-lg: 0.375rem;   /* 6px */
  --radius-xl: 0.5rem;     /* 8px */
  --radius-2xl: 0.75rem;   /* 12px */
  --radius-3xl: 1rem;      /* 16px */
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  
  /* Colors */
  --color-primary: #0019fd;
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;
  
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* 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;
  
  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --ease-out: cubic-bezier(0.0, 0.0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0.0, 1, 1);
  --ease-in-out: cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* ===== MODERN RESET & BASE STYLES ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: var(--leading-normal);
  color: var(--color-gray-900);
  background-color: #fff;
  overflow-x: hidden;
}

/* ===== CONTAINER SYSTEM ===== */
.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container-xs { max-width: var(--container-xs); }
.container-sm { max-width: var(--container-sm); }
.container-md { max-width: var(--container-md); }
.container-lg { max-width: var(--container-lg); }
.container-xl { max-width: var(--container-xl); }
.container-xxl { max-width: var(--container-xxl); }

/* ===== RESPONSIVE GRID SYSTEM ===== */
.grid {
  display: grid;
  gap: var(--space-6);
}

.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-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* Auto-fit responsive grid */
.grid-auto-fit { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-auto-fill { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

/* ===== FLEXBOX UTILITIES ===== */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-evenly { justify-content: space-evenly; }
.flex-1 { flex: 1 1 0%; }
.flex-auto { flex: 1 1 auto; }
.flex-none { flex: none; }

/* ===== SPACING 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; }

/* Margin scale */
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-4 { margin: var(--space-4); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }
.m-12 { margin: var(--space-12); }
.m-16 { margin: var(--space-16); }
.m-20 { margin: var(--space-20); }
.m-24 { margin: var(--space-24); }

/* Padding scale */
.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.p-12 { padding: var(--space-12); }
.p-16 { padding: var(--space-16); }
.p-20 { padding: var(--space-20); }
.p-24 { padding: var(--space-24); }

/* Directional spacing */
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }

.mx-4 { margin-left: var(--space-4); margin-right: var(--space-4); }
.my-4 { margin-top: var(--space-4); margin-bottom: var(--space-4); }
.mx-6 { margin-left: var(--space-6); margin-right: var(--space-6); }
.my-6 { margin-top: var(--space-6); margin-bottom: var(--space-6); }
.mx-8 { margin-left: var(--space-8); margin-right: var(--space-8); }
.my-8 { margin-top: var(--space-8); margin-bottom: var(--space-8); }

/* ===== TYPOGRAPHY UTILITIES ===== */
.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); }
.text-5xl { font-size: var(--text-5xl); }
.text-6xl { font-size: var(--text-6xl); }

.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; }

.leading-none { line-height: var(--leading-none); }
.leading-tight { line-height: var(--leading-tight); }
.leading-normal { line-height: var(--leading-normal); }
.leading-relaxed { line-height: var(--leading-relaxed); }

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

/* ===== COMPONENT ENHANCEMENTS ===== */

/* Enhanced Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: var(--leading-none);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-in-out);
  user-select: none;
  white-space: nowrap;
}

.btn:focus {
  outline: 2px solid transparent;
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary-700);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-primary:focus {
  ring: 2px solid var(--color-primary-500);
  ring-offset: 2px;
}

.btn-secondary {
  background-color: white;
  color: var(--color-gray-900);
  border-color: var(--color-gray-300);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--color-gray-50);
  border-color: var(--color-gray-400);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  background-color: var(--color-primary);
  color: white;
  transform: translateY(-1px);
}

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

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

.btn-xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--text-xl);
}

/* Enhanced Cards */
.card {
  background-color: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-200);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-body {
  padding: var(--space-6);
}

.card-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-gray-200);
  background-color: var(--color-gray-50);
}

.card-footer {
  padding: var(--space-6);
  border-top: 1px solid var(--color-gray-200);
  background-color: var(--color-gray-50);
}

/* Enhanced Navigation */
.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: var(--text-lg);
  text-decoration: none;
  color: var(--color-gray-900);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-weight: 500;
  color: var(--color-gray-700);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--duration-fast) var(--ease-out);
}

.nav-link:hover,
.nav-link.active {
  background-color: var(--color-gray-100);
  color: var(--color-gray-900);
}

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

/* Extra Small (xs) - Mobile Portrait */
@media (max-width: 479px) {
  :root {
    --container-padding: var(--space-4);
  }
  
  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
  
  .grid-cols-2-xs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-cols-1-xs { grid-template-columns: repeat(1, minmax(0, 1fr)); }
  
  .text-4xl-xs { font-size: var(--text-2xl); }
  .text-3xl-xs { font-size: var(--text-xl); }
  .text-2xl-xs { font-size: var(--text-lg); }
  .text-xl-xs { font-size: var(--text-base); }
  
  .p-8-xs { padding: var(--space-4); }
  .p-12-xs { padding: var(--space-6); }
  .p-16-xs { padding: var(--space-8); }
  
  .m-8-xs { margin: var(--space-4); }
  .m-12-xs { margin: var(--space-6); }
  .m-16-xs { margin: var(--space-8); }
  
  .flex-col-xs { flex-direction: column; }
  .text-center-xs { text-align: center; }
}

/* Small (sm) - Mobile Landscape & Tablet Portrait */
@media (min-width: 480px) and (max-width: 767px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
  
  .grid-cols-2-sm { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-cols-3-sm { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  
  .text-center-sm { text-align: center; }
  .flex-col-sm { flex-direction: column; }
}

/* Medium (md) - Tablet Landscape */
@media (min-width: 768px) and (max-width: 1023px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
  
  .grid-cols-2-md { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-cols-3-md { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-cols-4-md { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  
  .text-center-md { text-align: center; }
  .flex-row-md { flex-direction: row; }
}

/* Large (lg) - Desktop */
@media (min-width: 1024px) and (max-width: 1279px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
  
  .grid-cols-3-lg { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-cols-4-lg { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .grid-cols-6-lg { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

/* Extra Large (xl) - Large Desktop */
@media (min-width: 1280px) and (max-width: 1439px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
  
  .grid-cols-4-xl { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .grid-cols-5-xl { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .grid-cols-6-xl { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

/* XXL (2xl) - Ultra Wide */
@media (min-width: 1440px) {
  .container {
    padding-left: var(--space-12);
    padding-right: var(--space-12);
  }
  
  .grid-cols-6-2xl { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .grid-cols-8-2xl { grid-template-columns: repeat(8, minmax(0, 1fr)); }
}

/* ===== ENHANCED ANIMATIONS ===== */
.animate-fade-in {
  opacity: 0;
  animation: fadeIn var(--duration-slow) var(--ease-out) forwards;
}

.animate-slide-up {
  transform: translateY(20px);
  opacity: 0;
  animation: slideUp var(--duration-slow) var(--ease-out) forwards;
}

.animate-scale-in {
  transform: scale(0.95);
  opacity: 0;
  animation: scaleIn var(--duration-slow) var(--ease-out) forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes scaleIn {
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* ===== ACCESSIBILITY ENHANCEMENTS ===== */
.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;
}

/* Focus styles */
.focus-visible:focus {
  outline: 2px solid var(--color-primary-500);
  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;
    scroll-behavior: auto !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .btn-primary {
    border: 2px solid currentColor;
  }
  
  .card {
    border: 2px solid var(--color-gray-400);
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-gray-50: #18181b;
    --color-gray-100: #27272a;
    --color-gray-200: #3f3f46;
    --color-gray-300: #52525b;
    --color-gray-400: #71717a;
    --color-gray-500: #a1a1aa;
    --color-gray-600: #d4d4d8;
    --color-gray-700: #e4e4e7;
    --color-gray-800: #f4f4f5;
    --color-gray-900: #fafafa;
  }
  
  body {
    background-color: var(--color-gray-50);
    color: var(--color-gray-900);
  }
  
  .card {
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-300);
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  .btn {
    border: 1px solid black;
  }
  
  .card {
    border: 1px solid black;
    page-break-inside: avoid;
  }
}