/*
 * Design System Tokens
 * ====================
 * Centralized design tokens for consistent styling across the application.
 * All CSS files should reference these variables instead of hardcoded values.
 */

:root {
  /* ==========================================
   * COLOR PALETTE
   * ========================================== */

  /* Primary Brand Colors */
  --color-primary-50: #e8f4fd;
  --color-primary-100: #d1eafc;
  --color-primary-200: #a3d5f9;
  --color-primary-300: #75bff6;
  --color-primary-400: #47aaf3;
  --color-primary-500: #3498db;  /* Main primary */
  --color-primary-600: #2980b9;  /* Primary hover */
  --color-primary-700: #1f5f8b;  /* Primary active */
  --color-primary-800: #1a4d71;
  --color-primary-900: #143a57;

  /* Secondary/Accent Colors (Green) */
  --color-secondary-50: #e8f8f0;
  --color-secondary-100: #d1f1e0;
  --color-secondary-200: #a3e4c2;
  --color-secondary-300: #75d6a3;
  --color-secondary-400: #47c985;
  --color-secondary-500: #2ecc71;  /* Main secondary */
  --color-secondary-600: #27ae60;  /* Secondary hover */
  --color-secondary-700: #1e8449;
  --color-secondary-800: #186a3b;
  --color-secondary-900: #12512d;

  /* Success Colors */
  --color-success-50: #ecfdf5;
  --color-success-100: #d1fae5;
  --color-success-200: #a7f3d0;
  --color-success-300: #6ee7b7;
  --color-success-400: #34d399;
  --color-success-500: #10b981;  /* Main success */
  --color-success-600: #059669;  /* Success hover */
  --color-success-700: #047857;
  --color-success-800: #065f46;
  --color-success-900: #064e3b;

  /* Error/Danger Colors */
  --color-error-50: #fef2f2;
  --color-error-100: #fee2e2;
  --color-error-200: #fecaca;
  --color-error-300: #fca5a5;
  --color-error-400: #f87171;
  --color-error-500: #e74c3c;  /* Main error */
  --color-error-600: #c0392b;  /* Error hover */
  --color-error-700: #a93226;
  --color-error-800: #922b21;
  --color-error-900: #7b241c;

  /* Warning Colors */
  --color-warning-50: #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-200: #fde68a;
  --color-warning-300: #fcd34d;
  --color-warning-400: #fbbf24;
  --color-warning-500: #f59e0b;  /* Main warning */
  --color-warning-600: #d97706;  /* Warning hover */
  --color-warning-700: #b45309;
  --color-warning-800: #92400e;
  --color-warning-900: #78350f;

  /* Info Colors */
  --color-info-50: #eff6ff;
  --color-info-100: #dbeafe;
  --color-info-200: #bfdbfe;
  --color-info-300: #93c5fd;
  --color-info-400: #60a5fa;
  --color-info-500: #3b82f6;  /* Main info */
  --color-info-600: #2563eb;  /* Info hover */
  --color-info-700: #1d4ed8;
  --color-info-800: #1e40af;
  --color-info-900: #1e3a8a;

  /* Neutral/Gray Colors */
  --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;

  /* Text Colors */
  --color-text-primary: #2c3e50;
  --color-text-secondary: #34495e;
  --color-text-muted: #7f8c8d;
  --color-text-light: #95a5a6;
  --color-text-disabled: #bdc3c7;
  --color-text-inverse: #ffffff;

  /* Code/Syntax Colors */
  --color-code: #e83e8c;

  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #e9ecef;
  --color-bg-hover: #f3f4f6;
  --color-bg-active: #e5e7eb;
  --color-bg-disabled: #f3f4f6;

  /* Border Colors */
  --color-border-light: #e1e8ed;
  --color-border-default: #dee2e6;
  --color-border-dark: #d1d5db;
  --color-border-focus: var(--color-primary-500);

  /* Icon Colors (URL-encoded for SVG data URIs) */
  --icon-color-default: %236b7280;
  --icon-color-focus: %233498db;

  /* ==========================================
   * GRADIENTS
   * ========================================== */

  /* Brand Gradient (Logo) */
  --gradient-brand: linear-gradient(135deg, var(--color-primary-500), var(--color-secondary-500));
  --gradient-brand-horizontal: linear-gradient(90deg, var(--color-primary-500), var(--color-secondary-500));

  /* Primary Button Gradient */
  --gradient-primary: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
  --gradient-primary-hover: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-700));

  /* Secondary Button Gradient */
  --gradient-secondary: linear-gradient(135deg, var(--color-secondary-500), var(--color-secondary-600));
  --gradient-secondary-hover: linear-gradient(135deg, var(--color-secondary-600), var(--color-secondary-700));

  /* Danger Button Gradient */
  --gradient-danger: linear-gradient(135deg, var(--color-error-500), var(--color-error-600));
  --gradient-danger-hover: linear-gradient(135deg, var(--color-error-600), var(--color-error-700));

  /* Background Gradients */
  --gradient-bg-light: linear-gradient(135deg, var(--color-bg-secondary), var(--color-bg-tertiary));
  --gradient-bg-success: linear-gradient(135deg, var(--color-success-50), var(--color-bg-primary));
  --gradient-bg-error: linear-gradient(135deg, var(--color-error-50), var(--color-bg-primary));

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

  /* Font Families */
  --font-family-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;

  /* 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 Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* Letter Spacing */
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;

  /* ==========================================
   * SPACING
   * ========================================== */

  --space-0: 0;
  --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 */

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

  /* Border Widths */
  --border-width-0: 0;
  --border-width-1: 1px;
  --border-width-2: 2px;
  --border-width-4: 4px;

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.25rem;   /* 4px */
  --radius-default: 0.5rem; /* 8px */
  --radius-md: 0.75rem;   /* 12px */
  --radius-lg: 1rem;      /* 16px */
  --radius-xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;

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

  --shadow-none: none;
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-default: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.1);

  /* Colored Shadows */
  --shadow-primary: 0 4px 12px rgba(52, 152, 219, 0.3);
  --shadow-primary-sm: 0 2px 8px rgba(52, 152, 219, 0.3);
  --shadow-primary-focus: 0 2px 6px rgba(59, 130, 246, 0.15);
  --shadow-secondary: 0 4px 12px rgba(46, 204, 113, 0.3);
  --shadow-success: 0 4px 12px rgba(16, 185, 129, 0.3);
  --shadow-error: 0 4px 12px rgba(231, 76, 60, 0.3);
  --shadow-info: 0 4px 12px rgba(59, 130, 246, 0.3);
  --shadow-info-sm: 0 2px 6px rgba(59, 130, 246, 0.25);

  /* ==========================================
   * TRANSITIONS
   * ========================================== */

  --transition-fast: 150ms ease;
  --transition-default: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-slower: 500ms ease;

  /* ==========================================
   * Z-INDEX
   * ========================================== */

  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 500;
  --z-modal-backdrop: 900;
  --z-modal: 1000;
  --z-toast: 1100;
  --z-tooltip: 1200;

  /* ==========================================
   * LAYOUT
   * ========================================== */

  --container-max-width: 1300px;
  --container-max-width-lg: 1600px;
  --navbar-height: 64px;
  --navbar-height-mobile: 56px;

  /* ==========================================
   * COMPONENT TOKENS
   * ========================================== */

  /* Buttons */
  --btn-padding-x: var(--space-5);
  --btn-padding-y: var(--space-3);
  --btn-padding-x-sm: var(--space-4);
  --btn-padding-y-sm: var(--space-2);
  --btn-padding-x-lg: var(--space-6);
  --btn-padding-y-lg: var(--space-4);
  --btn-border-radius: var(--radius-default);
  --btn-font-weight: var(--font-weight-semibold);
  --btn-font-size: var(--font-size-base);
  --btn-font-size-sm: var(--font-size-sm);

  /* Form Inputs */
  --input-padding-x: var(--space-4);
  --input-padding-y: var(--space-3);
  --input-border-width: var(--border-width-2);
  --input-border-radius: var(--radius-default);
  --input-border-color: var(--color-border-light);
  --input-border-color-focus: var(--color-primary-500);
  --input-bg: var(--color-bg-primary);
  --input-font-size: var(--font-size-base);

  /* Cards */
  --card-padding: var(--space-6);
  --card-padding-sm: var(--space-5);
  --card-border-radius: var(--radius-md);
  --card-border-color: var(--color-border-light);
  --card-shadow: var(--shadow-default);
  --card-shadow-hover: var(--shadow-lg);
  --card-accent-height: var(--border-width-4);

  /* Tables */
  --table-cell-padding-x: var(--space-4);
  --table-cell-padding-y: var(--space-3);
  --table-header-bg: var(--color-gray-50);
  --table-border-color: var(--color-gray-200);
  --table-hover-bg: var(--color-gray-50);

  /* Toast */
  --toast-padding-x: var(--space-6);
  --toast-padding-y: var(--space-4);
  --toast-border-radius: var(--radius-default);
  --toast-min-width: 300px;
  --toast-max-width: 500px;
}

/* ==========================================
 * RESPONSIVE BREAKPOINTS (as CSS Custom Media)
 * Note: Use these in @media queries
 * ========================================== */

/*
 * Breakpoints:
 * --breakpoint-sm: 480px
 * --breakpoint-md: 768px
 * --breakpoint-lg: 1024px
 * --breakpoint-xl: 1280px
 */

/* Mobile-first responsive overrides */
@media (max-width: 768px) {
  :root {
    --navbar-height: var(--navbar-height-mobile);
    --card-padding: var(--space-5);
    --btn-padding-x: var(--space-4);
    --btn-padding-y: var(--space-2);
  }
}

@media (max-width: 480px) {
  :root {
    --card-padding: var(--space-4);
  }
}

/* ==========================================
 * UTILITY CLASSES
 * ========================================== */

/* Text Colors */
.text-primary { color: var(--color-primary-500); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success-500); }
.text-error { color: var(--color-error-500); }
.text-warning { color: var(--color-warning-500); }

/* Background Colors */
.bg-primary { background-color: var(--color-primary-500); }
.bg-secondary { background-color: var(--color-bg-secondary); }
.bg-success { background-color: var(--color-success-500); }
.bg-error { background-color: var(--color-error-500); }

/* Positive/Negative semantic classes */
.positive { color: var(--color-success-600); font-weight: var(--font-weight-semibold); }
.negative { color: var(--color-error-500); font-weight: var(--font-weight-semibold); }