/* ============================================================
   SCHOLARIA DESIGN TOKENS
   Single source of truth for all visual values.
   All component and page CSS should reference these variables.

   Breakpoints (mobile-first, use min-width):
     --bp-sm:  640px   (large phones landscape)
     --bp-md:  768px   (tablets)
     --bp-lg:  1024px  (small laptops / desktop nav threshold)
     --bp-xl:  1280px  (desktops)
     --bp-2xl: 1536px  (large monitors)
   ============================================================ */

:root {
  /* ---- Colors: Primary ---- */
  --color-primary: #0066cc;
  --color-primary-dark: #004d99;
  --color-primary-darker: #003d7a;
  --color-primary-light: #e6f0ff;
  --color-primary-hover: #0056b3;

  /* ---- Colors: Secondary ---- */
  --color-secondary: #00ccff;
  --color-secondary-dark: #00a3cc;
  --color-secondary-light: #e0f9ff;

  /* ---- Colors: Status ---- */
  --color-success: #28a745;
  --color-success-dark: #1e7e34;
  --color-success-light: #d4edda;
  --color-success-bg: #f0faf3;

  --color-warning: #ffc107;
  --color-warning-dark: #d39e00;
  --color-warning-light: #fff3cd;
  --color-warning-bg: #fffdf5;

  --color-danger: #dc3545;
  --color-danger-dark: #bd2130;
  --color-danger-light: #f8d7da;
  --color-danger-bg: #fef2f2;

  --color-info: #17a2b8;
  --color-info-dark: #117a8b;
  --color-info-light: #d1ecf1;
  --color-info-bg: #f0f9fb;

  /* ---- Colors: Neutral (Gray scale) ---- */
  --color-gray-50:  #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;

  /* ---- Colors: Semantic ---- */
  --color-surface: #ffffff;
  --color-background: #f9fafb;
  --color-text: #111827;
  --color-text-secondary: #6b7280;
  --color-text-tertiary: #9ca3af;
  --color-text-inverse: #ffffff;
  --color-border: #e5e7eb;
  --color-border-dark: #d1d5db;
  --color-overlay: rgba(0, 0, 0, 0.5);

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

  --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 */

  --line-height-tight:   1.25;
  --line-height-snug:    1.375;
  --line-height-normal:  1.5;
  --line-height-relaxed: 1.625;

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

  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide:   0.025em;

  /* ---- Spacing (4px base) ---- */
  --space-0:  0;
  --space-px: 1px;
  --space-0-5: 0.125rem; /* 2px */
  --space-1:  0.25rem;   /* 4px */
  --space-1-5: 0.375rem; /* 6px */
  --space-2:  0.5rem;    /* 8px */
  --space-2-5: 0.625rem; /* 10px */
  --space-3:  0.75rem;   /* 12px */
  --space-3-5: 0.875rem; /* 14px */
  --space-4:  1rem;      /* 16px */
  --space-5:  1.25rem;   /* 20px */
  --space-6:  1.5rem;    /* 24px */
  --space-7:  1.75rem;   /* 28px */
  --space-8:  2rem;      /* 32px */
  --space-9:  2.25rem;   /* 36px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-14: 3.5rem;    /* 56px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */

  /* ---- Border Radius ---- */
  --radius-none: 0;
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  24px;
  --radius-full: 9999px;

  /* ---- Shadows (elevation levels) ---- */
  --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 rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg:  0 10px 15px rgba(0, 0, 0, 0.07), 0 4px 6px rgba(0, 0, 0, 0.04);
  --shadow-xl:  0 20px 25px rgba(0, 0, 0, 0.08), 0 8px 10px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.15);
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.05);

  /* ---- Transitions ---- */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-slower: 500ms ease;

  /* ---- Z-index scale ---- */
  --z-dropdown:  100;
  --z-sticky:    200;
  --z-fixed:     300;
  --z-drawer:    400;
  --z-modal:     500;
  --z-popover:   600;
  --z-toast:     700;
  --z-tooltip:   800;

  /* ---- Layout ---- */
  --container-max: 1280px;
  --sidebar-width: 260px;
  --sidebar-collapsed: 68px;
  --topbar-height: 60px;
  --bottombar-height: 64px;
  --touch-target: 44px;

  /* ---- Focus ring ---- */
  --focus-ring: 0 0 0 3px var(--color-primary-light);
  --focus-ring-danger: 0 0 0 3px var(--color-danger-light);
}

/* ============================================================
   DARK MODE
   Activates via OS preference or manual [data-theme="dark"]
   ============================================================ */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary: #4d9fff;
    --color-primary-dark: #3385e6;
    --color-primary-darker: #1a6cd4;
    --color-primary-light: #1a2e4a;
    --color-primary-hover: #66b0ff;

    --color-secondary: #33d6ff;
    --color-secondary-dark: #00b8e6;
    --color-secondary-light: #0d2e3a;

    --color-success: #34d058;
    --color-success-dark: #28a745;
    --color-success-light: #1a3a25;
    --color-success-bg: #0d1f14;

    --color-warning: #ffca28;
    --color-warning-dark: #ffc107;
    --color-warning-light: #3a3018;
    --color-warning-bg: #1f1a0d;

    --color-danger: #f85149;
    --color-danger-dark: #dc3545;
    --color-danger-light: #3a1a1a;
    --color-danger-bg: #1f0d0d;

    --color-info: #33bbcc;
    --color-info-dark: #17a2b8;
    --color-info-light: #0d2e33;
    --color-info-bg: #0d1f22;

    --color-gray-50:  #111827;
    --color-gray-100: #1f2937;
    --color-gray-200: #374151;
    --color-gray-300: #4b5563;
    --color-gray-400: #6b7280;
    --color-gray-500: #9ca3af;
    --color-gray-600: #d1d5db;
    --color-gray-700: #e5e7eb;
    --color-gray-800: #f3f4f6;
    --color-gray-900: #f9fafb;

    --color-surface: #1f2937;
    --color-background: #111827;
    --color-text: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-text-tertiary: #9ca3af;
    --color-text-inverse: #111827;
    --color-border: #374151;
    --color-border-dark: #4b5563;
    --color-overlay: rgba(0, 0, 0, 0.7);

    --shadow-xs:  0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.25), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md:  0 4px 6px rgba(0, 0, 0, 0.25), 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-lg:  0 10px 15px rgba(0, 0, 0, 0.3), 0 4px 6px rgba(0, 0, 0, 0.2);
    --shadow-xl:  0 20px 25px rgba(0, 0, 0, 0.35), 0 8px 10px rgba(0, 0, 0, 0.2);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.5);

    --focus-ring: 0 0 0 3px var(--color-primary-light);
    --focus-ring-danger: 0 0 0 3px var(--color-danger-light);
  }
}

[data-theme="dark"] {
  --color-primary: #4d9fff;
  --color-primary-dark: #3385e6;
  --color-primary-darker: #1a6cd4;
  --color-primary-light: #1a2e4a;
  --color-primary-hover: #66b0ff;

  --color-secondary: #33d6ff;
  --color-secondary-dark: #00b8e6;
  --color-secondary-light: #0d2e3a;

  --color-success: #34d058;
  --color-success-dark: #28a745;
  --color-success-light: #1a3a25;
  --color-success-bg: #0d1f14;

  --color-warning: #ffca28;
  --color-warning-dark: #ffc107;
  --color-warning-light: #3a3018;
  --color-warning-bg: #1f1a0d;

  --color-danger: #f85149;
  --color-danger-dark: #dc3545;
  --color-danger-light: #3a1a1a;
  --color-danger-bg: #1f0d0d;

  --color-info: #33bbcc;
  --color-info-dark: #17a2b8;
  --color-info-light: #0d2e33;
  --color-info-bg: #0d1f22;

  --color-gray-50:  #111827;
  --color-gray-100: #1f2937;
  --color-gray-200: #374151;
  --color-gray-300: #4b5563;
  --color-gray-400: #6b7280;
  --color-gray-500: #9ca3af;
  --color-gray-600: #d1d5db;
  --color-gray-700: #e5e7eb;
  --color-gray-800: #f3f4f6;
  --color-gray-900: #f9fafb;

  --color-surface: #1f2937;
  --color-background: #111827;
  --color-text: #f9fafb;
  --color-text-secondary: #d1d5db;
  --color-text-tertiary: #9ca3af;
  --color-text-inverse: #111827;
  --color-border: #374151;
  --color-border-dark: #4b5563;
  --color-overlay: rgba(0, 0, 0, 0.7);

  --shadow-xs:  0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.25), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md:  0 4px 6px rgba(0, 0, 0, 0.25), 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-lg:  0 10px 15px rgba(0, 0, 0, 0.3), 0 4px 6px rgba(0, 0, 0, 0.2);
  --shadow-xl:  0 20px 25px rgba(0, 0, 0, 0.35), 0 8px 10px rgba(0, 0, 0, 0.2);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.5);

  --focus-ring: 0 0 0 3px var(--color-primary-light);
  --focus-ring-danger: 0 0 0 3px var(--color-danger-light);
}