/**
 * ============================================================================
 * DESIGN SYSTEM TOKENS - VARIABLES.CSS
 * Project: Malik Tayyab Jamil - Cloud & Software Engineering Portfolio
 * Target Environment: AWS S3 Static Website Hosting
 * Standards: WCAG 2.1 AA / AAA Compliant, Zero-Framework Vanilla CSS
 * ============================================================================
 */

:root {
  /* ==========================================================================
   * 1. COLOR PALETTE & SEMANTIC TOKENS (LIGHT MODE DEFAULT - SOFT SLATE)
   * ========================================================================== */
  
  /* Brand Palette Colors */
  --color-primary-rgb: 248, 250, 252;
  --color-primary: #F8FAFC;
  
  --color-secondary-rgb: 241, 245, 249;
  --color-secondary: #F1F5F9;
  
  /* Primary Accent - Sky Blue */
  --color-accent-rgb: 2, 132, 199;
  --color-accent: #0284C7;
  --color-accent-hover: #0369A1;
  --color-accent-light: rgba(2, 132, 199, 0.08);

  /* Secondary Accent - Teal */
  --color-secondary-accent-rgb: 13, 148, 136;
  --color-secondary-accent: #0D9488;
  --color-secondary-accent-hover: #0F766E;
  
  /* Neutral Canvas */
  --color-bg: #F8FAFC;                   /* Soft off-white */
  --color-surface: #F1F5F9;              /* Secondary Background */
  --color-card-bg: #FFFFFF;              /* Card Background */
  --color-surface-hover: #FFFFFF;
  --color-border: #E2E8F0;               /* Slate 200 */
  --color-border-subtle: #F1F5F9;
  --color-border-accent: rgba(2, 132, 199, 0.3);

  /* Glassmorphism Tokens */
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(226, 232, 240, 0.8);
  --glass-blur: blur(12px);
  --glass-shadow: 0 8px 32px 0 rgba(15, 23, 42, 0.06);
  
  /* Text & Typography Colors */
  --color-text-primary: #0F172A;         /* Slate 900 */
  --color-text-secondary: #475569;       /* Slate 600 */
  --color-text-muted: #64748B;           /* Slate 500 */
  --color-text-inverse: #FFFFFF;
  
  /* Status & Feedback Colors */
  --color-success: #16A34A;
  --color-warning: #D97706;
  --color-error: #DC2626;
  --color-info: #0284C7;

  /* AWS Brand Accent */
  --color-aws-orange: #FF9900;
  --color-aws-squid-ink: #232F3E;

  /* Background Ambient Effects */
  --bg-grid-color: rgba(2, 132, 199, 0.04);
  --bg-hero-glow: radial-gradient(circle at 50% 0%, rgba(2, 132, 199, 0.12) 0%, rgba(13, 148, 136, 0.05) 50%, transparent 80%);

  /* ==========================================================================
   * 2. TYPOGRAPHY TOKENS
   * ========================================================================== */
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  /* Type Scale - Linear / Vercel Precision */
  --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-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-none: 1;
  --line-height-tight: 1.2;
  --line-height-snug: 1.35;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.65;

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

  /* ==========================================================================
   * 3. SPACING & LAYOUT TOKENS (4px Grid 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 */

  /* Container Max Widths */
  --container-max-width: 1280px;
  --container-narrow-width: 890px;
  --container-padding: var(--space-6);

  /* ==========================================================================
   * 4. ELEVATION & SHADOW TOKENS
   * ========================================================================== */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.06), 0 2px 4px -1px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 4px 6px -2px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 30px -10px rgba(15, 23, 42, 0.1), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
  --shadow-glow: 0 0 25px -5px rgba(2, 132, 199, 0.3);
  --shadow-gold: 0 0 25px -5px rgba(2, 132, 199, 0.3);

  /* ==========================================================================
   * 5. BORDER RADIUS TOKENS
   * ========================================================================== */
  --radius-sm: 0.375rem;  /* 6px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-2xl: 1.25rem;  /* 20px */
  --radius-pill: 9999px;

  /* ==========================================================================
   * 6. TRANSITION & ANIMATION TOKENS (Smooth Eased Cubic Bezier)
   * ========================================================================== */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 250ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ==========================================================================
   * 7. Z-INDEX HIERARCHY
   * ========================================================================== */
  --z-negative: -1;
  --z-normal: 1;
  --z-card-hover: 10;
  --z-sticky: 100;
  --z-navbar: 500;
  --z-dropdown: 600;
  --z-modal: 1000;
  --z-toast: 1100;
  --z-loader: 2000;
}

/* ============================================================================
 * DARK THEME OVERRIDES [data-theme="dark"]
 * Modern Dark Tech Architecture inspired by Vercel & Linear
 * ============================================================================ */
[data-theme="dark"] {
  --color-primary-rgb: 11, 17, 32;
  --color-primary: #0B1120;
  
  --color-secondary-rgb: 17, 24, 39;
  --color-secondary: #111827;

  /* Primary Accent - Sky Blue */
  --color-accent-rgb: 56, 189, 248;
  --color-accent: #38BDF8;
  --color-accent-hover: #7DD3FC;
  --color-accent-light: rgba(56, 189, 248, 0.12);

  /* Secondary Accent - Teal */
  --color-secondary-accent-rgb: 20, 184, 166;
  --color-secondary-accent: #14B8A6;
  --color-secondary-accent-hover: #2DD4BF;

  /* Neutral Dark Canvas */
  --color-bg: #0B1120;                   /* Primary Background */
  --color-surface: #111827;              /* Secondary Background */
  --color-card-bg: #1E293B;              /* Card Background */
  --color-surface-hover: #1E293B;
  --color-border: #334155;               /* Borders */
  --color-border-subtle: #1E293B;
  --color-border-accent: rgba(56, 189, 248, 0.35);

  /* Glassmorphism Tokens */
  --glass-bg: rgba(30, 41, 59, 0.7);
  --glass-border: rgba(51, 65, 85, 0.7);
  --glass-blur: blur(16px);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);

  /* Text & Typography Colors */
  --color-text-primary: #F8FAFC;         /* Text */
  --color-text-secondary: #CBD5E1;       /* Secondary Text */
  --color-text-muted: #94A3B8;           /* Muted Text */
  --color-text-inverse: #0F172A;

  /* Status Colors */
  --color-success: #22C55E;              /* Success */
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #38BDF8;

  /* Background Ambient Effects */
  --bg-grid-color: rgba(56, 189, 248, 0.05);
  --bg-hero-glow: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.18) 0%, rgba(20, 184, 166, 0.08) 50%, transparent 80%);

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.6), 0 0 20px 0 rgba(56, 189, 248, 0.08);
  --shadow-xl: 0 20px 30px -10px rgba(0, 0, 0, 0.7), 0 0 30px 0 rgba(56, 189, 248, 0.12);
  --shadow-glow: 0 0 25px -5px rgba(56, 189, 248, 0.35);
  --shadow-gold: 0 0 25px -5px rgba(56, 189, 248, 0.35);
}