/* ============================================
   VARIABLES.CSS - Design System Tokens
   HOLISYS - National Fire Detection & Alarm System
   ============================================ */

:root {
  /* ------------------------------------------
     COLOR SYSTEM
     ------------------------------------------ */
  
  /* Primary Colors - Fire/Safety Theme */
  --color-primary: #dc2626;
  --color-primary-dark: #b91c1c;
  --color-primary-light: #ef4444;
  --color-primary-50: #fef2f2;
  --color-primary-100: #fee2e2;
  --color-primary-200: #fecaca;
  --color-primary-300: #fca5a5;
  --color-primary-400: #f87171;
  --color-primary-500: #ef4444;
  --color-primary-600: #dc2626;
  --color-primary-700: #b91c1c;
  --color-primary-800: #991b1b;
  --color-primary-900: #7f1d1d;

  /* Secondary Colors - Technology/Trust */
  --color-secondary: #0ea5e9;
  --color-secondary-dark: #0284c7;
  --color-secondary-light: #38bdf8;
  --color-secondary-50: #f0f9ff;
  --color-secondary-100: #e0f2fe;
  --color-secondary-200: #bae6fd;
  --color-secondary-300: #7dd3fc;
  --color-secondary-400: #38bdf8;
  --color-secondary-500: #0ea5e9;
  --color-secondary-600: #0284c7;
  --color-secondary-700: #0369a1;
  --color-secondary-800: #075985;
  --color-secondary-900: #0c4a6e;

  /* Accent Colors - Alert/Warning */
  --color-accent: #f59e0b;
  --color-accent-dark: #d97706;
  --color-accent-light: #fbbf24;
  --color-accent-50: #fffbeb;
  --color-accent-100: #fef3c7;
  --color-accent-200: #fde68a;
  --color-accent-300: #fcd34d;
  --color-accent-400: #fbbf24;
  --color-accent-500: #f59e0b;
  --color-accent-600: #d97706;
  --color-accent-700: #b45309;
  --color-accent-800: #92400e;
  --color-accent-900: #78350f;

  /* Neutral Scale - Gray */
  --color-neutral-50: #fafafa;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #e5e5e5;
  --color-neutral-300: #d4d4d4;
  --color-neutral-400: #a3a3a3;
  --color-neutral-500: #737373;
  --color-neutral-600: #525252;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;
  --color-neutral-900: #171717;
  --color-neutral-950: #0a0a0a;

  /* Semantic Colors */
  --color-success: #22c55e;
  --color-success-light: #86efac;
  --color-success-dark: #16a34a;
  --color-warning: #f59e0b;
  --color-warning-light: #fcd34d;
  --color-warning-dark: #d97706;
  --color-danger: #dc2626;
  --color-danger-light: #fca5a5;
  --color-danger-dark: #b91c1c;
  --color-info: #3b82f6;
  --color-info-light: #93c5fd;
  --color-info-dark: #2563eb;

  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #fafafa;
  --color-bg-tertiary: #f5f5f5;
  --color-bg-dark: #0a0a0a;
  --color-bg-dark-elevated: #171717;

  /* Text Colors */
  --color-text-primary: #171717;
  --color-text-secondary: #525252;
  --color-text-muted: #737373;
  --color-text-inverse: #ffffff;
  --color-text-inverse-muted: #a3a3a3;

  /* Border Colors */
  --color-border: #e5e5e5;
  --color-border-light: #f5f5f5;
  --color-border-dark: #404040;

  /* ------------------------------------------
     TYPOGRAPHY SYSTEM
     ------------------------------------------ */
  
  /* Font Families */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Monaco, 'Cascadia Code', monospace;

  /* Font Sizes - Major Third Scale (1.25) */
  --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 */

  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

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

  /* ------------------------------------------
     SPACING SYSTEM - 8px Base Grid
     ------------------------------------------ */
  --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 */
  --space-32: 8rem;        /* 128px */
  --space-40: 10rem;       /* 160px */
  --space-48: 12rem;       /* 192px */
  --space-56: 14rem;       /* 224px */
  --space-64: 16rem;       /* 256px */

  /* ------------------------------------------
     LAYOUT SYSTEM
     ------------------------------------------ */
  
  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
  --container-max: 1440px;

  /* Grid System */
  --grid-columns: 12;
  --grid-gap: var(--space-6);
  --grid-gap-sm: var(--space-4);
  --grid-gap-lg: var(--space-8);

  /* ------------------------------------------
     BORDER SYSTEM
     ------------------------------------------ */
  --radius-none: 0;
  --radius-sm: 0.125rem;   /* 2px */
  --radius-md: 0.25rem;    /* 4px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-3xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;

  /* Border Widths */
  --border-width-0: 0;
  --border-width-1: 1px;
  --border-width-2: 2px;
  --border-width-4: 4px;
  --border-width-8: 8px;

  /* ------------------------------------------
     SHADOW SYSTEM
     ------------------------------------------ */
  --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);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
  --shadow-none: none;

  /* Dark Shadows */
  --shadow-dark-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-dark-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-dark-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.5);

  /* ------------------------------------------
     TRANSITION SYSTEM
     ------------------------------------------ */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
  --transition-slower: 500ms ease-in-out;

  /* Easing Functions */
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* ------------------------------------------
     Z-INDEX SYSTEM
     ------------------------------------------ */
  --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 SYSTEM
     ------------------------------------------ */
  --animate-pulse: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
  --animate-spin: spin 1s linear infinite;
  --animate-bounce: bounce 1s infinite;
  --animate-fade-in: fadeIn 0.3s ease-out;
  --animate-slide-up: slideUp 0.3s ease-out;
  --animate-slide-down: slideDown 0.3s ease-out;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #171717;
    --color-bg-tertiary: #262626;
    --color-text-primary: #fafafa;
    --color-text-secondary: #a3a3a3;
    --color-text-muted: #737373;
    --color-border: #404040;
    --color-border-light: #262626;
  }
}

/* Keyframe Animations */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(-25%); animation-timing-function: cubic-bezier(0.8, 0, 1, 1); }
  50% { transform: translateY(0); animation-timing-function: cubic-bezier(0, 0, 0.2, 1); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 5px var(--color-primary), 0 0 10px var(--color-primary); }
  50% { box-shadow: 0 0 20px var(--color-primary), 0 0 30px var(--color-primary); }
}

@keyframes signal-pulse {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.5); opacity: 0.5; }
  100% { transform: scale(2); opacity: 0; }
}