:root {
  --background: 225 33% 97%;
  --foreground: 228 29% 14%;
  --primary: 191 90% 45%;
  --secondary: 273 83% 59%;
  --muted: 223 26% 91%;
  --destructive: 0 79% 58%;
  --border: 224 23% 85%;
  --card: 0 0% 100%;
  --shadow-sm: 0 10px 24px rgba(12, 20, 38, 0.06);
  --shadow-md: 0 14px 40px rgba(12, 20, 38, 0.10);
  --shadow-lg: 0 18px 48px rgba(22, 109, 196, 0.18);
  --transition-fast: 150ms ease;
  --transition-smooth: 280ms cubic-bezier(0.22, 1, 0.36, 1);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

.dark {
  --background: 227 31% 10%;
  --foreground: 210 20% 96%;
  --primary: 189 92% 58%;
  --secondary: 275 90% 68%;
  --muted: 226 22% 18%;
  --destructive: 0 72% 60%;
  --border: 226 18% 23%;
  --card: 228 29% 13%;
  --shadow-sm: 0 10px 24px rgba(0, 0, 0, 0.22);
  --shadow-md: 0 14px 40px rgba(0, 0, 0, 0.30);
  --shadow-lg: 0 18px 52px rgba(28, 166, 255, 0.20);
}

* {
  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: hsl(var(--background));
  color: hsl(var(--foreground));
}

button,
a {
  transition: all var(--transition-smooth);
}

::selection {
  background: hsl(var(--primary) / 0.22);
  color: hsl(var(--foreground));
}