/**
 * CSS Custom Properties (Variables)
 * Complete Design System for Essa Technologies
 * New Brand Identity - Modern, Bold, AI-Forward
 */

:root {
  /* ==========================================
     COLOR SYSTEM - New Brand Identity
     ========================================== */

  /* Primary Brand Colors */
  --color-primary: #6366f1;        /* Indigo - Main brand color */
  --color-primary-light: #818cf8;  /* Light indigo */
  --color-primary-dark: #4f46e5;   /* Dark indigo */
  --color-primary-darker: #4338ca; /* Darker indigo */

  /* Secondary/Accent Colors */
  --color-accent: #06b6d4;         /* Cyan - Electric accent */
  --color-accent-light: #22d3ee;   /* Light cyan */
  --color-accent-dark: #0891b2;    /* Dark cyan */

  /* Purple Gradient Range */
  --color-purple: #8b5cf6;         /* Purple */
  --color-purple-light: #a78bfa;   /* Light purple */
  --color-purple-dark: #7c3aed;    /* Dark purple */

  /* Neutral Colors - Light Mode */
  --color-background: #ffffff;
  --color-surface: #f8fafc;
  --color-surface-2: #f1f5f9;
  --color-surface-3: #e2e8f0;

  --color-text-primary: #0f172a;
  --color-text-secondary: #334155;
  --color-text-tertiary: #64748b;
  --color-text-muted: #94a3b8;

  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-border-dark: #cbd5e1;

  /* Dark Mode Colors */
  --color-dark-background: #0f0f1e;
  --color-dark-surface: #1a1a2e;
  --color-dark-surface-2: #252540;
  --color-dark-surface-3: #2f2f52;

  --color-dark-text-primary: #f1f5f9;
  --color-dark-text-secondary: #cbd5e1;
  --color-dark-text-tertiary: #94a3b8;
  --color-dark-text-muted: #64748b;

  --color-dark-border: #252540;
  --color-dark-border-light: #1a1a2e;
  --color-dark-border-dark: #2f2f52;

  /* Semantic Colors */
  --color-success: #10b981;
  --color-success-light: #34d399;
  --color-warning: #f59e0b;
  --color-warning-light: #fbbf24;
  --color-error: #ef4444;
  --color-error-light: #f87171;
  --color-info: #3b82f6;
  --color-info-light: #60a5fa;

  /* Gradient Definitions */
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-purple) 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-accent) 0%, var(--color-primary) 100%);
  --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  --gradient-mesh: radial-gradient(at 40% 20%, hsla(250, 90%, 70%, 0.3) 0px, transparent 50%),
                   radial-gradient(at 80% 0%, hsla(200, 90%, 70%, 0.3) 0px, transparent 50%),
                   radial-gradient(at 0% 50%, hsla(280, 90%, 70%, 0.3) 0px, transparent 50%);

  /* Glass Effects */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-bg-dark: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-blur: blur(12px);

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

  /* Font Families */
  --font-primary: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  /* Font Sizes - Fluid Typography */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);      /* 12-14px */
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);        /* 14-16px */
  --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);      /* 16-18px */
  --font-size-md: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);       /* 18-20px */
  --font-size-lg: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);        /* 20-24px */
  --font-size-xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);              /* 24-32px */
  --font-size-2xl: clamp(2rem, 1.6rem + 2vw, 3rem);               /* 32-48px */
  --font-size-3xl: clamp(2.5rem, 2rem + 2.5vw, 4rem);             /* 40-64px */
  --font-size-4xl: clamp(3rem, 2.5rem + 3vw, 5rem);               /* 48-80px */

  /* 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;
  --font-weight-black: 900;

  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* Letter Spacing */
  --letter-spacing-tight: -0.02em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.02em;
  --letter-spacing-wider: 0.05em;

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

  --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 */

  /* Section Spacing */
  --section-padding-y: clamp(4rem, 8vw, 8rem);
  --section-padding-x: clamp(1rem, 5vw, 2rem);

  /* Container */
  --container-max-width: 1280px;
  --container-padding: var(--space-6);

  /* ==========================================
     BORDER RADIUS
     ========================================== */

  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-3xl: 2rem;      /* 32px */
  --radius-full: 9999px;

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

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);

  /* Colored Shadows */
  --shadow-primary: 0 8px 24px -4px rgba(99, 102, 241, 0.3);
  --shadow-accent: 0 8px 24px -4px rgba(6, 182, 212, 0.3);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.4);

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

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

  --z-base: 0;
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-fixed: 30;
  --z-modal-backdrop: 40;
  --z-modal: 50;
  --z-popover: 60;
  --z-tooltip: 70;
  --z-cursor: 9999;

  /* ==========================================
     TRANSITIONS & ANIMATIONS
     ========================================== */

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-slower: 500ms ease;

  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.0, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* ==========================================
     BREAKPOINTS (for reference in JS)
     ========================================== */

  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;

  /* ==========================================
     MISC
     ========================================== */

  --header-height: 80px;
  --border-width: 1px;
  --border-width-thick: 2px;

  /* Backdrop Filters */
  --backdrop-blur: blur(12px);
  --backdrop-blur-sm: blur(8px);
  --backdrop-blur-lg: blur(16px);

  /* Overlay Colors */
  --overlay-light: rgba(255, 255, 255, 0.9);
  --overlay-dark: rgba(0, 0, 0, 0.7);

  /* Focus Ring */
  --focus-ring: 0 0 0 3px rgba(99, 102, 241, 0.5);
  --focus-ring-dark: 0 0 0 3px rgba(99, 102, 241, 0.3);
}

/* ==========================================
   DARK MODE OVERRIDES
   ========================================== */

[data-theme="dark"] {
  --color-background: var(--color-dark-background);
  --color-surface: var(--color-dark-surface);
  --color-surface-2: var(--color-dark-surface-2);
  --color-surface-3: var(--color-dark-surface-3);

  --color-text-primary: var(--color-dark-text-primary);
  --color-text-secondary: var(--color-dark-text-secondary);
  --color-text-tertiary: var(--color-dark-text-tertiary);
  --color-text-muted: var(--color-dark-text-muted);

  --color-border: var(--color-dark-border);
  --color-border-light: var(--color-dark-border-light);
  --color-border-dark: var(--color-dark-border-dark);

  --shadow-sm: var(--shadow-dark-sm);
  --shadow-md: var(--shadow-dark-md);
  --shadow-lg: var(--shadow-dark-lg);

  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-bg-dark: rgba(255, 255, 255, 0.02);
  --glass-border: rgba(255, 255, 255, 0.1);

  --focus-ring: var(--focus-ring-dark);
}

/* ==========================================
   SYSTEM PREFERENCE DETECTION
   ========================================== */

@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
    --transition-slow: 0ms;
    --transition-slower: 0ms;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-background: var(--color-dark-background);
    --color-surface: var(--color-dark-surface);
    --color-surface-2: var(--color-dark-surface-2);
    --color-surface-3: var(--color-dark-surface-3);

    --color-text-primary: var(--color-dark-text-primary);
    --color-text-secondary: var(--color-dark-text-secondary);
    --color-text-tertiary: var(--color-dark-text-tertiary);
    --color-text-muted: var(--color-dark-text-muted);

    --color-border: var(--color-dark-border);
    --color-border-light: var(--color-dark-border-light);
    --color-border-dark: var(--color-dark-border-dark);

    --shadow-sm: var(--shadow-dark-sm);
    --shadow-md: var(--shadow-dark-md);
    --shadow-lg: var(--shadow-dark-lg);
  }
}