/**
 * Design Tokens System - Standards 2025
 * Utilise oklch pour une meilleure cohérence des couleurs
 * Support natif du dark mode et des préférences utilisateur
 */

:root {
  /* === Espacement === */
  --space-xs: 0.25rem;    /* 4px */
  --space-sm: 0.5rem;     /* 8px */
  --space-md: 1rem;       /* 16px */
  --space-lg: 1.5rem;     /* 24px */
  --space-xl: 2rem;       /* 32px */
  --space-2xl: 3rem;      /* 48px */
  --space-3xl: 4rem;      /* 64px */
  --space-4xl: 6rem;      /* 96px */

  /* === Typographie === */
  --font-family-base: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
  --font-family-display: system-ui, -apple-system, sans-serif;

  --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-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;

  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;

  /* === Couleurs - Light Mode (oklch) === */
  --color-primary: oklch(0.55 0.22 250);
  --color-primary-light: oklch(0.65 0.18 250);
  --color-primary-dark: oklch(0.45 0.25 250);
  --color-primary-contrast: oklch(0.98 0.01 250);

  --color-secondary: oklch(0.60 0.15 180);
  --color-secondary-light: oklch(0.70 0.12 180);
  --color-secondary-dark: oklch(0.50 0.18 180);

  --color-accent: oklch(0.65 0.20 30);
  --color-accent-light: oklch(0.75 0.18 30);
  --color-accent-dark: oklch(0.55 0.22 30);

  --color-success: oklch(0.60 0.15 145);
  --color-warning: oklch(0.70 0.15 85);
  --color-error: oklch(0.55 0.20 25);
  --color-info: oklch(0.60 0.15 240);

  --color-neutral-50: oklch(0.98 0.002 250);
  --color-neutral-100: oklch(0.95 0.005 250);
  --color-neutral-200: oklch(0.90 0.008 250);
  --color-neutral-300: oklch(0.85 0.010 250);
  --color-neutral-400: oklch(0.70 0.012 250);
  --color-neutral-500: oklch(0.60 0.015 250);
  --color-neutral-600: oklch(0.50 0.018 250);
  --color-neutral-700: oklch(0.40 0.020 250);
  --color-neutral-800: oklch(0.30 0.022 250);
  --color-neutral-900: oklch(0.20 0.025 250);
  --color-neutral-950: oklch(0.15 0.030 250);

  /* === Couleurs sémantiques === */
  --color-background: var(--color-neutral-50);
  --color-surface: var(--color-neutral-100);
  --color-surface-elevated: var(--color-neutral-50);
  --color-text: var(--color-neutral-900);
  --color-text-secondary: var(--color-neutral-600);
  --color-text-muted: var(--color-neutral-500);
  --color-border: var(--color-neutral-300);
  --color-border-subtle: var(--color-neutral-200);

  /* === Ombres === */
  --shadow-xs: 0 1px 2px 0 oklch(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 oklch(0 0 0 / 0.1), 0 1px 2px -1px oklch(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px oklch(0 0 0 / 0.1), 0 2px 4px -2px oklch(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px oklch(0 0 0 / 0.1), 0 4px 6px -4px oklch(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px oklch(0 0 0 / 0.1), 0 8px 10px -6px oklch(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px oklch(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 oklch(0 0 0 / 0.05);

  /* === Bordures === */
  --radius-none: 0;
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-2xl: 1.5rem;   /* 24px */
  --radius-full: 9999px;

  --border-width-thin: 1px;
  --border-width-medium: 2px;
  --border-width-thick: 3px;

  /* === Transitions === */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* === Z-index === */
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;

  /* === Breakpoints (Container Queries) === */
  --breakpoint-xs: 20rem;   /* 320px */
  --breakpoint-sm: 24rem;   /* 384px */
  --breakpoint-md: 48rem;  /* 768px */
  --breakpoint-lg: 64rem;  /* 1024px */
  --breakpoint-xl: 80rem;  /* 1280px */
  --breakpoint-2xl: 96rem; /* 1536px */

  /* === Layout === */
  --container-padding: var(--space-md);
  --container-max-width: 80rem; /* 1280px */
  --grid-gap: var(--space-md);
  --section-spacing: var(--space-4xl);
}

/* === Dark Mode === */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: oklch(0.65 0.22 250);
    --color-primary-light: oklch(0.75 0.18 250);
    --color-primary-dark: oklch(0.55 0.25 250);
    --color-primary-contrast: oklch(0.15 0.01 250);

    --color-secondary: oklch(0.70 0.15 180);
    --color-secondary-light: oklch(0.80 0.12 180);
    --color-secondary-dark: oklch(0.60 0.18 180);

    --color-accent: oklch(0.75 0.20 30);
    --color-accent-light: oklch(0.85 0.18 30);
    --color-accent-dark: oklch(0.65 0.22 30);

    --color-success: oklch(0.70 0.15 145);
    --color-warning: oklch(0.80 0.15 85);
    --color-error: oklch(0.65 0.20 25);
    --color-info: oklch(0.70 0.15 240);

    --color-neutral-50: oklch(0.15 0.030 250);
    --color-neutral-100: oklch(0.20 0.025 250);
    --color-neutral-200: oklch(0.30 0.022 250);
    --color-neutral-300: oklch(0.40 0.020 250);
    --color-neutral-400: oklch(0.50 0.018 250);
    --color-neutral-500: oklch(0.60 0.015 250);
    --color-neutral-600: oklch(0.70 0.012 250);
    --color-neutral-700: oklch(0.85 0.010 250);
    --color-neutral-800: oklch(0.90 0.008 250);
    --color-neutral-900: oklch(0.95 0.005 250);
    --color-neutral-950: oklch(0.98 0.002 250);

    --color-background: var(--color-neutral-950);
    --color-surface: var(--color-neutral-900);
    --color-surface-elevated: var(--color-neutral-800);
    --color-text: var(--color-neutral-50);
    --color-text-secondary: var(--color-neutral-400);
    --color-text-muted: var(--color-neutral-500);
    --color-border: var(--color-neutral-700);
    --color-border-subtle: var(--color-neutral-800);

    --shadow-xs: 0 1px 2px 0 oklch(0 0 0 / 0.3);
    --shadow-sm: 0 1px 3px 0 oklch(0 0 0 / 0.4), 0 1px 2px -1px oklch(0 0 0 / 0.4);
    --shadow-md: 0 4px 6px -1px oklch(0 0 0 / 0.4), 0 2px 4px -2px oklch(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px oklch(0 0 0 / 0.4), 0 4px 6px -4px oklch(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px oklch(0 0 0 / 0.4), 0 8px 10px -6px oklch(0 0 0 / 0.4);
    --shadow-2xl: 0 25px 50px -12px oklch(0 0 0 / 0.5);
    --shadow-inner: inset 0 2px 4px 0 oklch(0 0 0 / 0.3);
  }
}

/* === Classes utilitaires pour personnalisation === */
[data-theme="light"] {
  color-scheme: light;
}

[data-theme="dark"] {
  color-scheme: dark;
  --color-background: var(--color-neutral-950);
  --color-surface: var(--color-neutral-900);
  --color-surface-elevated: var(--color-neutral-800);
  --color-text: var(--color-neutral-50);
  --color-text-secondary: var(--color-neutral-400);
  --color-text-muted: var(--color-neutral-500);
  --color-border: var(--color-neutral-700);
  --color-border-subtle: var(--color-neutral-800);
}

/* === Support prefers-reduced-motion === */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
    --transition-slow: 0ms;
    --transition-bounce: 0ms;
  }
}