/**
 * ATHLYTX ELITE DESIGN TOKENS
 * Apple-inspired glassmorphism design system
 * Version: 1.0.0
 */

:root {
  /* ============================================
     COLOR SYSTEM
     ============================================ */

  /* Primary Brand Colors */
  --color-primary: #667eea;
  --color-primary-light: #818cf8;
  --color-primary-dark: #5568d3;
  --color-secondary: #764ba2;
  --color-accent: #f093fb;

  /* Brand Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-brand: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  --gradient-mesh: radial-gradient(at 0% 0%, rgba(102, 126, 234, 0.15) 0px, transparent 50%),
                   radial-gradient(at 100% 0%, rgba(118, 75, 162, 0.15) 0px, transparent 50%),
                   radial-gradient(at 100% 100%, rgba(240, 147, 251, 0.1) 0px, transparent 50%),
                   radial-gradient(at 0% 100%, rgba(102, 126, 234, 0.1) 0px, transparent 50%);

  /* Dark Theme Backgrounds - Layered Depth */
  --bg-base: #0a0e27;
  --bg-layer-1: #1a1f3a;
  --bg-layer-2: #242b4d;
  --bg-layer-3: #2d3558;

  /* Glass Surface Layers */
  --glass-1: rgba(255, 255, 255, 0.03);
  --glass-2: rgba(255, 255, 255, 0.06);
  --glass-3: rgba(255, 255, 255, 0.09);
  --glass-4: rgba(255, 255, 255, 0.12);
  --glass-5: rgba(255, 255, 255, 0.16);

  /* Hairline Borders */
  --border-1: rgba(255, 255, 255, 0.08);
  --border-2: rgba(255, 255, 255, 0.12);
  --border-3: rgba(255, 255, 255, 0.18);
  --border-focus: rgba(102, 126, 234, 0.5);

  /* Text Hierarchy */
  --text-primary: rgba(255, 255, 255, 0.95);
  --text-secondary: rgba(255, 255, 255, 0.72);
  --text-tertiary: rgba(255, 255, 255, 0.50);
  --text-disabled: rgba(255, 255, 255, 0.32);

  /* Status Colors - Athletic Performance */
  --status-fresh: #34c759;
  --status-fresh-dim: rgba(52, 199, 89, 0.15);
  --status-optimal: #30d5c8;
  --status-optimal-dim: rgba(48, 213, 200, 0.15);
  --status-fatigued: #ff9f0a;
  --status-fatigued-dim: rgba(255, 159, 10, 0.15);
  --status-danger: #ff453a;
  --status-danger-dim: rgba(255, 69, 58, 0.15);

  /* HR Zone Colors */
  --zone-1: #34c759;  /* Recovery */
  --zone-2: #30d5c8;  /* Aerobic */
  --zone-3: #5ac8fa;  /* Tempo */
  --zone-4: #ff9f0a;  /* Threshold */
  --zone-5: #ff453a;  /* Max */

  /* Device Brand Colors */
  --brand-whoop: #FF6B35;
  --brand-garmin: #007CC3;
  --brand-oura: #B45CF3;
  --brand-strava: #FC4C02;

  /* Additional Glass Surfaces */
  --glass-white-95: rgba(255, 255, 255, 0.95);
  --glass-white-90: rgba(255, 255, 255, 0.9);
  --glass-white-98: rgba(255, 255, 255, 0.98);

  /* Dark Glass Surfaces */
  --glass-dark-90: rgba(10, 14, 39, 0.9);
  --glass-dark-80: rgba(10, 14, 39, 0.8);

  /* Semantic Colors */
  --color-success: #34c759;
  --color-success-bg: rgba(52, 199, 89, 0.12);
  --color-warning: #ff9f0a;
  --color-warning-bg: rgba(255, 159, 10, 0.12);
  --color-error: #ff453a;
  --color-error-bg: rgba(255, 69, 58, 0.12);
  --color-info: #5ac8fa;
  --color-info-bg: rgba(90, 200, 250, 0.12);

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

  /* Font Stacks */
  --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', 'Courier New', monospace;

  /* Type Scale - Responsive with clamp */
  --text-6xl: clamp(3.75rem, 8vw, 6rem);     /* 60px - 96px */
  --text-5xl: clamp(3rem, 6vw, 4.5rem);      /* 48px - 72px */
  --text-4xl: clamp(2.25rem, 4vw, 3.75rem);  /* 36px - 60px */
  --text-3xl: clamp(1.875rem, 3vw, 3rem);    /* 30px - 48px */
  --text-2xl: clamp(1.5rem, 2.5vw, 2.25rem); /* 24px - 36px */
  --text-xl: 1.25rem;                         /* 20px */
  --text-lg: 1.125rem;                        /* 18px */
  --text-base: 1rem;                          /* 16px */
  --text-sm: 0.875rem;                        /* 14px */
  --text-xs: 0.75rem;                         /* 12px */
  --text-2xs: 0.625rem;                       /* 10px */

  /* Font Weights */
  --weight-thin: 100;
  --weight-extralight: 200;
  --weight-light: 300;
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-extrabold: 800;
  --weight-black: 900;

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 1.8;

  /* 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 - 4px 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 */

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

  --radius-xs: 0.25rem;   /* 4px */
  --radius-sm: 0.5rem;    /* 8px */
  --radius-md: 0.75rem;   /* 12px */
  --radius-lg: 1rem;      /* 16px */
  --radius-xl: 1.25rem;   /* 20px */
  --radius-2xl: 1.5rem;   /* 24px */
  --radius-3xl: 1.75rem;  /* 28px */
  --radius-full: 9999px;

  /* ============================================
     SHADOWS - Dark Theme Optimized
     ============================================ */

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4),
               0 1px 2px -1px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5),
               0 2px 4px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6),
               0 4px 6px -4px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7),
               0 8px 10px -6px rgba(0, 0, 0, 0.7);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.8);

  /* Inner Shadows for Depth */
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.4);
  --shadow-inner-lg: inset 0 4px 8px 0 rgba(0, 0, 0, 0.5);

  /* Brand Glow Effects */
  --glow-primary: 0 0 20px rgba(102, 126, 234, 0.3),
                  0 0 40px rgba(102, 126, 234, 0.15);
  --glow-brand: 0 0 25px rgba(102, 126, 234, 0.25),
                0 0 50px rgba(118, 75, 162, 0.15);
  --glow-status-fresh: 0 0 15px rgba(52, 199, 89, 0.3);
  --glow-status-danger: 0 0 15px rgba(255, 69, 58, 0.3);

  /* ============================================
     BLUR VALUES - Backdrop Filter
     ============================================ */

  --blur-sm: 8px;
  --blur-md: 16px;
  --blur-lg: 20px;
  --blur-xl: 32px;
  --blur-2xl: 48px;

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

  --z-base: 0;
  --z-raised: 10;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;

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

  /* Easing Functions */
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --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-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Duration Values */
  --duration-instant: 100ms;
  --duration-fast: 150ms;
  --duration-normal: 200ms;
  --duration-moderate: 300ms;
  --duration-slow: 400ms;
  --duration-slower: 700ms;

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

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

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

  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1600px;

  --content-max-width: 1600px;
  --sidebar-width: 280px;
  --header-height: 72px;

  /* ============================================
     LEGACY VARIABLE ALIASES (for compatibility)
     ============================================ */

  /* Color aliases */
  --primary: var(--color-primary);
  --primary-light: var(--color-primary-light);
  --primary-dark: var(--color-primary-dark);
  --secondary: var(--color-secondary);
  --accent: var(--color-accent);

  /* Background aliases */
  --background-dark: var(--bg-base);
  --surface-dark: var(--bg-layer-1);
  --surface-light: var(--bg-layer-2);

  /* Glass effect aliases */
  --glass-background: var(--glass-2);
  --glass-border: var(--border-2);

  /* Spacing aliases */
  --spacing-xs: var(--space-2);
  --spacing-sm: var(--space-3);
  --spacing-md: var(--space-4);
  --spacing-lg: var(--space-6);
  --spacing-xl: var(--space-8);
  --spacing-2xl: var(--space-12);
}

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

.bg-gradient-primary {
  background: var(--gradient-primary);
}

.bg-gradient-brand {
  background: var(--gradient-brand);
}

.bg-gradient-mesh {
  background: var(--gradient-mesh);
}

/* Text Gradients */
.text-gradient-primary {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-gradient-brand {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   GLOBAL RESETS & BASE STYLES
   ============================================ */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-base);
  overflow-x: hidden;
}

/* Improved focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Selection styling */
::selection {
  background-color: rgba(102, 126, 234, 0.3);
  color: var(--text-primary);
}

/* Scrollbar styling for webkit browsers */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--bg-layer-1);
}

::-webkit-scrollbar-thumb {
  background: var(--glass-3);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-layer-1);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--glass-4);
}

/* ============================================
   ACCESSIBILITY UTILITIES
   ============================================ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}