/* A.I. ClassMate Design System */
:root {
  /* ── Colors (HSL) ── */
  --background: 210 40% 99%;
  --foreground: 222 47% 11%;
  --primary: 221 83% 53%;
  --primary-foreground: 210 40% 98%;
  --secondary: 210 40% 96%;
  --secondary-foreground: 222 47% 11%;
  --accent: 189 85% 92%;
  --accent-foreground: 222 47% 11%;
  --muted: 210 40% 96%;
  --muted-foreground: 215 16% 47%;
  --destructive: 0 84% 60%;
  --border: 214 32% 91%;
  --ring: 221 83% 53%;
  --card: 0 0% 100%;
  --card-foreground: 222 47% 11%;

  /* Extra semantic tokens */
  --success: 142 71% 45%;
  --success-foreground: 210 40% 98%;
  --warning: 38 92% 50%;
  --warning-foreground: 222 47% 11%;
  --info: 199 89% 48%;
  --info-foreground: 210 40% 98%;

  /* ── Shadows ── */
  --shadow-sm: 0 1px 2px 0 hsl(var(--foreground) / 0.05);
  --shadow-md: 0 4px 6px -1px hsl(var(--foreground) / 0.08), 0 2px 4px -2px hsl(var(--foreground) / 0.05);
  --shadow-lg: 0 10px 15px -3px hsl(var(--foreground) / 0.08), 0 4px 6px -4px hsl(var(--foreground) / 0.03);
  --shadow-elegant: 0 12px 34px -14px hsl(var(--primary) / 0.35);

  /* ── Gradients ── */
  --gradient-primary: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--info)));
  --gradient-subtle: linear-gradient(135deg, hsl(var(--background)), hsl(var(--secondary)));
  --gradient-hero: radial-gradient(1200px 600px at 20% 10%, hsl(var(--accent)) 0%, transparent 60%), radial-gradient(900px 500px at 90% 20%, hsl(var(--primary) / 0.18) 0%, transparent 55%), linear-gradient(180deg, hsl(var(--background)), hsl(var(--secondary)));

  /* ── Transitions ── */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* ── Border Radius ── */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --font-display: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
}

.dark, [data-theme="dark"] {
  --background: 222 47% 11%;
  --foreground: 210 40% 98%;
  --primary: 217 91% 60%;
  --primary-foreground: 222 47% 11%;
  --secondary: 217 33% 17%;
  --secondary-foreground: 210 40% 98%;
  --accent: 189 70% 22%;
  --accent-foreground: 210 40% 98%;
  --muted: 217 33% 17%;
  --muted-foreground: 215 20% 65%;
  --destructive: 0 72% 51%;
  --border: 217 33% 20%;
  --ring: 217 91% 60%;
  --card: 222 47% 13%;
  --card-foreground: 210 40% 98%;

  --success: 142 70% 42%;
  --success-foreground: 210 40% 98%;
  --warning: 38 92% 50%;
  --warning-foreground: 222 47% 11%;
  --info: 199 89% 55%;
  --info-foreground: 222 47% 11%;

  --shadow-sm: 0 1px 2px 0 hsl(0 0% 0% / 0.25);
  --shadow-md: 0 10px 20px -10px hsl(0 0% 0% / 0.55);
  --shadow-lg: 0 18px 40px -18px hsl(0 0% 0% / 0.65);
  --shadow-elegant: 0 18px 50px -22px hsl(var(--primary) / 0.55);

  --gradient-hero: radial-gradient(1200px 600px at 20% 10%, hsl(var(--accent) / 0.45) 0%, transparent 60%), radial-gradient(900px 500px at 90% 20%, hsl(var(--primary) / 0.22) 0%, transparent 55%), linear-gradient(180deg, hsl(var(--background)), hsl(var(--secondary)));
}

html, body {
  height: 100%;
}

body {
  font-family: var(--font-sans);
}

/* Focus styles */
:focus-visible {
  outline: 2px solid hsl(var(--ring));
  outline-offset: 2px;
}

/* Subtle background pattern */
.bg-grid {
  background-image: radial-gradient(hsl(var(--border)) 1px, transparent 1px);
  background-size: 18px 18px;
}

/* Scrollbar (best-effort) */
* {
  scrollbar-width: thin;
  scrollbar-color: hsl(var(--muted-foreground)) transparent;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}