/* ============================================
   CHub Design Tokens
   shadcn/ui v4 Dark Theme (oklch with hex fallbacks)
   ============================================ */

:root {
  /* ---- shadcn/ui v4 dark theme core tokens ---- */
  --background: oklch(0.145 0 0);           /* #1b1b1f */
  --foreground: oklch(0.985 0 0);           /* #fafafa */
  --card: oklch(0.205 0 0);                 /* #2a2a2e */
  --card-foreground: oklch(0.985 0 0);      /* #fafafa */
  --popover: oklch(0.205 0 0);             /* #2a2a2e */
  --popover-foreground: oklch(0.985 0 0);  /* #fafafa */
  --primary: oklch(0.922 0 0);             /* #e8e8e8 */
  --primary-foreground: oklch(0.205 0 0);  /* #2a2a2e */
  --secondary: oklch(0.269 0 0);           /* #3a3a3f */
  --secondary-foreground: oklch(0.985 0 0);/* #fafafa */
  --muted: oklch(0.269 0 0);              /* #3a3a3f */
  --muted-foreground: oklch(0.708 0 0);   /* #ababab */
  --accent: oklch(0.371 0 0);             /* #525258 */
  --accent-foreground: oklch(0.985 0 0);  /* #fafafa */
  --destructive: oklch(0.704 0.191 22.216); /* #ef4444 */
  --border: oklch(1 0 0 / 10%);           /* rgba(255,255,255,0.1) */
  --input: oklch(1 0 0 / 15%);            /* rgba(255,255,255,0.15) */
  --ring: oklch(0.556 0 0);               /* #858585 */

  /* ---- Brand orange accent ---- */
  --brand: #f97316;
  --brand-foreground: #ffffff;
  --brand-hover: #ea580c;
  --brand-muted: rgba(249, 115, 22, 0.15);
  --brand-subtle: rgba(249, 115, 22, 0.10);
  --brand-ring: rgba(249, 115, 22, 0.50);

  /* ---- Sidebar tokens ---- */
  --sidebar: oklch(0.175 0 0);             /* slightly lighter than background */
  --sidebar-foreground: oklch(0.985 0 0);  /* #fafafa */
  --sidebar-accent: oklch(0.269 0 0);      /* #3a3a3f */
  --sidebar-accent-foreground: oklch(0.985 0 0); /* #fafafa */
  --sidebar-border: oklch(1 0 0 / 10%);   /* matches --border */
  --sidebar-muted-foreground: oklch(0.708 0 0); /* #ababab */
  --sidebar-width: 256px;
  --sidebar-width-lesson: 280px;

  /* ---- Radius scale (base 0.625rem / 10px) ---- */
  --radius: 0.625rem;
  --radius-sm: calc(var(--radius) - 4px);   /* ~0.375rem / 6px  */
  --radius-md: calc(var(--radius) - 2px);   /* ~0.5rem   / 8px  */
  --radius-lg: var(--radius);                /* 0.625rem  / 10px */
  --radius-xl: calc(var(--radius) + 4px);    /* ~0.875rem / 14px */
  --radius-full: 9999px;

  /* ---- Chart colors ---- */
  --chart-1: oklch(0.646 0.222 41.116);    /* brand orange family */
  --chart-2: oklch(0.6 0.118 184);         /* teal */
  --chart-3: oklch(0.398 0.07 227.392);    /* blue */
  --chart-4: oklch(0.828 0.189 84.429);    /* yellow */
  --chart-5: oklch(0.769 0.188 70.08);     /* amber */

  /* Fallback chart colors */
  --chart-1-hex: #f97316;
  --chart-2-hex: #2dd4bf;
  --chart-3-hex: #3b82f6;
  --chart-4-hex: #eab308;
  --chart-5-hex: #f59e0b;

  /* ---- Semantic status colors ---- */
  --success: #22c55e;
  --success-foreground: #ffffff;
  --success-muted: rgba(34, 197, 94, 0.15);
  --warning: #eab308;
  --warning-foreground: #1b1b1f;
  --warning-muted: rgba(234, 179, 8, 0.15);
  --danger: #ef4444;
  --danger-foreground: #ffffff;
  --danger-muted: rgba(239, 68, 68, 0.15);
  --info: #3b82f6;
  --info-foreground: #ffffff;
  --info-muted: rgba(59, 130, 246, 0.15);

  /* ---- Typography ---- */
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Geist Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;

  /* ---- Shadows (dark-theme tuned) ---- */
  --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: 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, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);

  /* ---- Transitions ---- */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  /* ---- Z-index scale ---- */
  --z-dropdown: 50;
  --z-sticky: 40;
  --z-overlay: 30;
  --z-modal: 60;
  --z-popover: 50;
  --z-toast: 70;

  /* ---- VATSIM rating colors ---- */
  --rating-obs: #6b7280;
  --rating-s1: #60a5fa;
  --rating-s2: #34d399;
  --rating-s3: #a78bfa;
  --rating-c1: #fbbf24;
  --rating-c3: #f97316;
  --rating-i1: #f472b6;
  --rating-i3: #e879f9;
  --rating-sup: #dc2626;
  --rating-adm: #ef4444;

  /* ---- Navbar height ---- */
  --header-height: 48px;
}