/* ================================
   BASE CSS - Core Styles & Variables
   ================================ */

/* CSS Variables for theming */
:root {
  /* Primary Colors */
  --color-primary: #88b1c9;
  --color-primary-dark: #6d79ac;
  --color-primary-light: #eef2ff;
  
  /* Secondary Colors */
  --color-secondary: #80b8b2;
  --color-secondary-dark: #bcddd9;
  --color-secondary-light: #e5f9f7;
  
  /* Success Colors */
  --color-success: #2a9d8f;
  --color-success-dark: #218074;
  --color-success-light: #e6f5f3;
  
  /* Danger Colors */
  --color-danger: #e63946;
  --color-danger-dark: #c81e2a;
  --color-danger-light: #fdebec;
  
  /* Warning Colors */
  --color-warning: #ff9f1c;
  --color-warning-dark: #e08e1a;
  --color-warning-light: #fff4e6;
  
  /* Info Colors */
  --color-info: #4cc9f0;
  --color-info-dark: #3db8df;
  --color-info-light: #e3f8fe;
  
  /* Gray Scale */
  --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;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --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);
  
  /* Font Family */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
}

/* Dark mode variables */
.dark {
  --bg-primary: var(--color-gray-900);
  --bg-secondary: var(--color-gray-800);
  --text-primary: var(--color-gray-200);
  --text-secondary: var(--color-gray-400);
  --border-color: var(--color-gray-700);
}

/* Light mode variables */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: var(--color-gray-50);
  --text-primary: var(--color-gray-800);
  --text-secondary: var(--color-gray-600);
  --border-color: var(--color-gray-200);
}

/* ================================
   RESET & BASE STYLES
   ================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  min-height: 100vh;
  overscroll-behavior: none;
}

/* Dark mode body */
body.dark {
  background-color: var(--color-gray-900);
  color: var(--color-gray-200);
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img, svg {
  max-width: 100%;
  height: auto;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

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

table {
  border-collapse: collapse;
  width: 100%;
}

/* ================================
   TYPOGRAPHY
   ================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: var(--spacing-4);
  color: var(--text-primary);
}

.dark h1, .dark h2, .dark h3, .dark h4, .dark h5, .dark h6 {
  color: var(--color-gray-100);
}

h1, .text-2xl { font-size: 1.5rem; }
h2, .text-xl { font-size: 1.25rem; }
h3, .text-lg { font-size: 1.125rem; }
.text-base { font-size: 1rem; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.font-normal { font-weight: 400; }

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

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.whitespace-nowrap { white-space: nowrap; }
.leading-relaxed { line-height: 1.625; }

/* ================================
   COLOR UTILITIES
   ================================ */

/* Text Colors */
.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: #ffffff; }
.text-gray-400 { color: var(--color-gray-400); }
.text-gray-500 { color: var(--color-gray-500); }
.text-gray-600 { color: var(--color-gray-600); }
.text-gray-700 { color: var(--color-gray-700); }
.text-gray-800 { color: var(--color-gray-800); }
.text-red-500 { color: #ef4444; }

/* Background Colors */
.bg-white { background-color: #ffffff; }
.bg-black { background-color: #000000; }
.bg-primary { background-color: var(--color-primary); }
.bg-primary-light { background-color: var(--color-primary-light); }
.bg-secondary { background-color: var(--color-secondary); }
.bg-secondary-light { background-color: var(--color-secondary-light); }
.bg-success { background-color: var(--color-success); }
.bg-success-light { background-color: var(--color-success-light); }
.bg-danger { background-color: var(--color-danger); }
.bg-danger-light { background-color: var(--color-danger-light); }
.bg-warning { background-color: var(--color-warning); }
.bg-warning-light { background-color: var(--color-warning-light); }
.bg-info-light { background-color: var(--color-info-light); }
.bg-gray-50 { background-color: var(--color-gray-50); }
.bg-gray-100 { background-color: var(--color-gray-100); }
.bg-gray-200 { background-color: var(--color-gray-200); }

/* Dark mode backgrounds */
.dark .bg-gray-700 { background-color: var(--color-gray-700); }
.dark .bg-gray-800 { background-color: var(--color-gray-800); }
.dark .bg-gray-900 { background-color: var(--color-gray-900); }

/* Tailwind-style dark mode classes */
.dark .dark\:bg-gray-700 { background-color: var(--color-gray-700); }
.dark .dark\:bg-gray-800 { background-color: var(--color-gray-800); }
.dark .dark\:bg-gray-900 { background-color: var(--color-gray-900); }
.dark .dark\:bg-gray-600 { background-color: var(--color-gray-600); }

.dark .dark\:text-gray-100 { color: var(--color-gray-100); }
.dark .dark\:text-gray-200 { color: var(--color-gray-200); }
.dark .dark\:text-gray-300 { color: var(--color-gray-300); }
.dark .dark\:text-gray-400 { color: var(--color-gray-400); }

.dark .dark\:border-gray-600 { border-color: var(--color-gray-600); }
.dark .dark\:border-gray-700 { border-color: var(--color-gray-700); }

.dark .dark\:text-primary-light { color: var(--color-primary-light); }
.dark .dark\:text-green-500 { color: #22c55e; }
.dark .dark\:text-red-500 { color: #ef4444; }
.dark .dark\:hover\:bg-gray-600:hover { background-color: var(--color-gray-600); }
.dark .dark\:hover\:bg-gray-700:hover { background-color: var(--color-gray-700); }

/* Dark mode text */
.dark .text-gray-100 { color: var(--color-gray-100); }
.dark .text-gray-200 { color: var(--color-gray-200); }
.dark .text-gray-300 { color: var(--color-gray-300); }
.dark .text-gray-400 { color: var(--color-gray-400); }

/* Opacity */
.bg-opacity-50 { opacity: 0.5; }
.bg-black.bg-opacity-50 { background-color: rgba(0, 0, 0, 0.5); }

/* Responsive hide for large screens only */
@media (min-width: 1024px) {
  .lg\:\!hidden { display: none !important; }
}

/* ================================
   BORDERS
   ================================ */

.border { border: 1px solid var(--border-color); }
.border-b { border-bottom: 1px solid var(--border-color); }
.border-t { border-top: 1px solid var(--border-color); }
.border-l { border-left: 1px solid var(--border-color); }
.border-r { border-right: 1px solid var(--border-color); }

.dark .border { border-color: var(--color-gray-700); }
.dark .border-b { border-color: var(--color-gray-700); }
.dark .border-t { border-color: var(--color-gray-700); }

/* Border Left Accent */
.border-l-4 { border-left-width: 4px; border-left-style: solid; }
.border-l-4.border-primary { border-left-color: var(--color-primary); }
.border-l-4.border-success { border-left-color: var(--color-success); }
.border-l-4.border-warning { border-left-color: var(--color-warning); }
.border-l-4.border-info { border-left-color: var(--color-info); }
.border-l-4.border-danger { border-left-color: var(--color-danger); }

/* Rounded */
.rounded { border-radius: var(--radius-md); }
.rounded-sm { border-radius: var(--radius-sm); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }
.rounded-t-lg { border-top-left-radius: var(--radius-lg); border-top-right-radius: var(--radius-lg); }
.rounded-md { border-radius: var(--radius-md); }

/* ================================
   SHADOWS
   ================================ */

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }