/*
  Modern CSS Custom Properties (Variables)
  DATAFACE - Design System
*/

:root {
  /* Brand Colors */
  --color-primary: #213251;
  --color-primary-light: #2f4979;
  --color-primary-dark: #1a2641;
  --color-secondary: #6c757d;
  --color-success: #28a745;
  --color-danger: #dc3545;
  --color-warning: #ffc107;
  --color-info: #17a2b8;
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-light: #f8f9fa;
  --color-gray-100: #f8f9fa;
  --color-gray-200: #e9ecef;
  --color-gray-300: #dee2e6;
  --color-gray-400: #ced4da;
  --color-gray-500: #adb5bd;
  --color-gray-600: #6c757d;
  --color-gray-700: #495057;
  --color-gray-800: #343a40;
  --color-gray-900: #212529;
  --color-black: #000000;
  
  /* Typography */
  --font-family-primary: 'Inter', sans-serif;
  --font-family-secondary: 'Source Sans Pro', sans-serif;
  
  /* 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: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Spacing Scale */
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */
  --spacing-32: 8rem;     /* 128px */
  
  /* Border Radius */
  --border-radius-sm: 0.125rem;  /* 2px */
  --border-radius-md: 0.375rem;  /* 6px */
  --border-radius-lg: 0.5rem;    /* 8px */
  --border-radius-xl: 0.75rem;   /* 12px */
  --border-radius-2xl: 1rem;     /* 16px */
  --border-radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  
  /* Breakpoints (for reference in media queries) */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-2xl: 1400px;
  
  /* 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;
  --z-index-toast: 1080;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #4a6fa5;
    --color-primary-light: #5a7fb5;
    --color-primary-dark: #3a5f95;
    --color-white: #ffffff;
    --color-light: #2a2a2a;
    --color-gray-100: #2a2a2a;
    --color-gray-200: #3a3a3a;
    --color-gray-300: #4a4a4a;
    --color-gray-400: #5a5a5a;
    --color-gray-500: #6a6a6a;
    --color-gray-600: #7a7a7a;
    --color-gray-700: #8a8a8a;
    --color-gray-800: #9a9a9a;
    --color-gray-900: #aaaaaa;
    --color-black: #ffffff;
  }
}

/* Dark mode class-based toggle */
.dark-mode {
  --color-primary: #4a6fa5;
  --color-primary-light: #5a7fb5;
  --color-primary-dark: #3a5f95;
  --color-white: #ffffff;
  --color-light: #2a2a2a;
  --color-gray-100: #2a2a2a;
  --color-gray-200: #3a3a3a;
  --color-gray-300: #4a4a4a;
  --color-gray-400: #5a5a5a;
  --color-gray-500: #6a6a6a;
  --color-gray-600: #7a7a7a;
  --color-gray-700: #8a8a8a;
  --color-gray-800: #9a9a9a;
  --color-gray-900: #aaaaaa;
  --color-black: #ffffff;
}

/* Modern utility classes */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.text-info { color: var(--color-info); }
.text-white { color: var(--color-white); }
.text-black { color: var(--color-black); }

/* Hero section specific overrides */
.bg-primary .text-white,
.bg-primary .text-white h1,
.bg-primary .text-white h2,
.bg-primary .text-white h3,
.bg-primary .text-white h4,
.bg-primary .text-white h5,
.bg-primary .text-white h6,
.bg-primary .text-white p,
.bg-primary .text-white span,
.bg-primary .text-white strong,
.bg-primary .text-white em {
  color: #ffffff !important;
}

.bg-primary { background-color: var(--color-primary); }
.bg-secondary { background-color: var(--color-secondary); }
.bg-success { background-color: var(--color-success); }
.bg-danger { background-color: var(--color-danger); }
.bg-warning { background-color: var(--color-warning); }
.bg-info { background-color: var(--color-info); }
.bg-white { background-color: var(--color-white); }
.bg-light { background-color: var(--color-light); }

/* Modern grid system */
.grid {
  display: grid;
  gap: var(--spacing-4);
}

.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); }

/* Modern 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; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

/* Modern spacing utilities */
.p-0 { padding: var(--spacing-0); }
.p-1 { padding: var(--spacing-1); }
.p-2 { padding: var(--spacing-2); }
.p-3 { padding: var(--spacing-3); }
.p-4 { padding: var(--spacing-4); }
.p-5 { padding: var(--spacing-5); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }

.m-0 { margin: var(--spacing-0); }
.m-1 { margin: var(--spacing-1); }
.m-2 { margin: var(--spacing-2); }
.m-3 { margin: var(--spacing-3); }
.m-4 { margin: var(--spacing-4); }
.m-5 { margin: var(--spacing-5); }
.m-6 { margin: var(--spacing-6); }
.m-8 { margin: var(--spacing-8); }

/* Modern buttons */
.btn-modern {
  padding: var(--spacing-3) var(--spacing-6);
  border-radius: var(--border-radius-md);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  border: none;
  cursor: pointer;
  font-family: var(--font-family-primary);
}

.btn-modern:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-modern-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-modern-primary:hover {
  background-color: var(--color-primary-dark);
}

/* Modern form elements */
.form-modern {
  padding: var(--spacing-3);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius-md);
  font-family: var(--font-family-primary);
  transition: all var(--transition-fast);
}

.form-modern:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(33, 50, 81, 0.1);
}

/* Modern cards */
.card-modern {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

/* Performance optimizations */
.will-change-transform {
  will-change: transform;
}

.will-change-opacity {
  will-change: opacity;
}

/* Accessibility improvements */
.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;
}

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

/* Modern responsive utilities */
@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .md\:flex-row { flex-direction: row; }
  .md\:text-left { text-align: left; }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
  .lg\:text-lg { font-size: var(--font-size-lg); }
}