/* ============================================
   DESIGN TOKENS — Single source of truth for
   colors, fonts, spacing, shadows, and radii.
   ============================================ */

:root {
  /* Colors */
  --color-bg: #FFFFFF;
  --color-bg-subtle: #F8FAFB;
  --color-bg-overlay: rgba(0, 0, 0, 0.55);
  --color-text: #1A1A2E;
  --color-text-muted: #6B7280;
  --color-text-light: #9CA3AF;
  --color-accent: #2563EB;
  --color-accent-hover: #1D4ED8;
  --color-accent-light: rgba(37, 99, 235, 0.08);
  --color-accent-glow: rgba(37, 99, 235, 0.15);
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  --color-white: #FFFFFF;
  --color-black: #000000;

  /* Status badges */
  --color-ongoing: #059669;
  --color-ongoing-bg: rgba(5, 150, 105, 0.08);
  --color-completed: #2563EB;
  --color-completed-bg: rgba(37, 99, 235, 0.08);
  --color-upcoming: #D97706;
  --color-upcoming-bg: rgba(217, 119, 6, 0.08);

  /* Typography */
  --font-heading: 'Playfair Display', 'Georgia', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --fs-xs: 0.75rem;      /* 12px */
  --fs-sm: 0.875rem;     /* 14px */
  --fs-base: 1rem;       /* 16px */
  --fs-md: 1.125rem;     /* 18px */
  --fs-lg: 1.25rem;      /* 20px */
  --fs-xl: 1.5rem;       /* 24px */
  --fs-2xl: 2rem;        /* 32px */
  --fs-3xl: 2.5rem;      /* 40px */
  --fs-4xl: 3rem;        /* 48px */
  --fs-5xl: 3.5rem;      /* 56px */

  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  --lh-tight: 1.2;
  --lh-normal: 1.5;
  --lh-relaxed: 1.7;

  --ls-tight: -0.02em;
  --ls-normal: 0;
  --ls-wide: 0.05em;
  --ls-wider: 0.1em;

  /* Spacing scale (4px base) */
  --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 */

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --nav-height: 72px;

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.05), 0 4px 16px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 8px 30px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.45, 0, 0.55, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;

  /* Z-index scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}