:root {
  --background: 220 33% 97%;
  --foreground: 224 28% 13%;
  --primary: 196 88% 46%;
  --secondary: 264 85% 63%;
  --muted: 220 24% 92%;
  --destructive: 0 78% 58%;
  --border: 220 20% 84%;
  --card: 0 0% 100%;

  --shadow-sm: 0 8px 20px hsla(220, 35%, 18%, 0.06);
  --shadow-md: 0 18px 40px hsla(220, 35%, 18%, 0.12);
  --shadow-lg: 0 28px 80px hsla(220, 35%, 18%, 0.18);

  --transition-fast: 160ms ease;
  --transition-smooth: 280ms cubic-bezier(0.22, 1, 0.36, 1);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

.dark {
  --background: 225 32% 9%;
  --foreground: 210 33% 96%;
  --primary: 190 95% 58%;
  --secondary: 270 92% 69%;
  --muted: 223 24% 16%;
  --destructive: 3 83% 63%;
  --border: 223 19% 23%;
  --card: 224 28% 12%;

  --shadow-sm: 0 10px 22px hsla(225, 45%, 2%, 0.24);
  --shadow-md: 0 18px 48px hsla(225, 45%, 2%, 0.34);
  --shadow-lg: 0 32px 90px hsla(225, 45%, 2%, 0.48);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, hsla(190, 95%, 58%, 0.12), transparent 28%),
    radial-gradient(circle at top right, hsla(270, 92%, 69%, 0.1), transparent 24%),
    hsl(var(--background));
  color: hsl(var(--foreground));
  transition: background var(--transition-smooth), color var(--transition-smooth);
}

#root {
  min-height: 100vh;
}

button,
a,
input,
select {
  transition: all var(--transition-fast);
}

::selection {
  background: hsl(var(--primary) / 0.24);
  color: hsl(var(--foreground));
}