/* ============================================
   PrepAce Design Tokens
   ============================================ */

:root {
  /* ---- Colors ---- */
  --color-primary: #4F46E5;
  --color-primary-light: #818CF8;
  --color-primary-lighter: #C7D2FE;
  --color-primary-dark: #3730A3;
  --color-primary-bg: rgba(79, 70, 229, 0.08);

  --color-accent: #10B981;
  --color-accent-light: #6EE7B7;
  --color-accent-dark: #059669;
  --color-accent-bg: rgba(16, 185, 129, 0.08);

  --color-warning: #F59E0B;
  --color-warning-light: #FCD34D;
  --color-warning-bg: rgba(245, 158, 11, 0.08);

  --color-danger: #EF4444;
  --color-danger-light: #FCA5A5;
  --color-danger-bg: rgba(239, 68, 68, 0.08);

  --color-info: #3B82F6;
  --color-info-bg: rgba(59, 130, 246, 0.08);

  /* Surfaces */
  --bg-body: #F1F5F9;
  --bg-surface: #FFFFFF;
  --bg-surface-hover: #F8FAFC;
  --bg-surface-secondary: #F8FAFC;
  --bg-elevated: #FFFFFF;
  --bg-overlay: rgba(15, 23, 42, 0.5);

  /* Text */
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-tertiary: #94A3B8;
  --text-inverse: #F8FAFC;
  --text-link: #4F46E5;

  /* Borders */
  --border-color: #E2E8F0;
  --border-color-light: #F1F5F9;
  --border-color-focus: #4F46E5;

  /* 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(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 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);

  /* ---- Typography ---- */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --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 */

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

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

  /* ---- Spacing ---- */
  --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 */

  /* ---- Layout ---- */
  --sidebar-width: 260px;
  --sidebar-collapsed: 72px;
  --header-height: 64px;
  --bottom-nav-height: 64px;
  --content-max-width: 1280px;

  /* ---- Borders ---- */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;

  /* ---- Transitions ---- */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

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

/* ============================================
   Dark Theme
   ============================================ */
[data-theme="dark"] {
  --bg-body: #0F172A;
  --bg-surface: #1E293B;
  --bg-surface-hover: #263447;
  --bg-surface-secondary: #1A2332;
  --bg-elevated: #263447;
  --bg-overlay: rgba(0, 0, 0, 0.6);

  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-tertiary: #64748B;
  --text-inverse: #0F172A;

  --border-color: #334155;
  --border-color-light: #1E293B;

  --shadow-xs: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -2px rgba(0,0,0,0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.3), 0 4px 6px -4px rgba(0,0,0,0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.3), 0 8px 10px -6px rgba(0,0,0,0.2);
}