:root {
  --background: 222 47% 97%;
  --foreground: 225 27% 14%;
  --primary: 253 84% 61%;
  --secondary: 190 78% 45%;
  --muted: 220 24% 92%;
  --destructive: 2 78% 58%;
  --border: 221 20% 84%;
  --card: 0 0% 100%;

  --shadow-sm: 0 1px 2px hsla(225, 35%, 18%, 0.08);
  --shadow-md: 0 10px 30px hsla(225, 35%, 18%, 0.10);
  --shadow-lg: 0 24px 60px hsla(225, 35%, 18%, 0.16);

  --transition-fast: 160ms ease;
  --transition-smooth: 320ms cubic-bezier(0.2, 0.8, 0.2, 1);

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

.dark {
  --background: 228 30% 8%;
  --foreground: 220 25% 94%;
  --primary: 257 92% 72%;
  --secondary: 184 84% 56%;
  --muted: 228 19% 16%;
  --destructive: 2 88% 66%;
  --border: 226 17% 24%;
  --card: 228 23% 11%;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, hsla(257, 92%, 72%, 0.16), transparent 28%),
    radial-gradient(circle at top right, hsla(184, 84%, 56%, 0.12), transparent 22%),
    hsl(var(--background));
  transition: background var(--transition-smooth), color var(--transition-fast);
}

.card-surface {
  background: hsl(var(--card) / 0.82);
  border: 1px solid hsl(var(--border) / 0.8);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px);
}

.soft-ring {
  box-shadow: 0 0 0 1px hsl(var(--border) / 0.7), var(--shadow-sm);
}

.metric-glow {
  position: relative;
  overflow: hidden;
}

.metric-glow::after {
  content: "";
  position: absolute;
  inset: -1px;
  background: linear-gradient(135deg, hsla(257, 92%, 72%, 0.10), hsla(184, 84%, 56%, 0.06));
  pointer-events: none;
}

.grid-fade {
  background-image:
    linear-gradient(hsla(221, 20%, 50%, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, hsla(221, 20%, 50%, 0.08) 1px, transparent 1px);
  background-size: 20px 20px;
}

button,
a {
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
}

button:hover,
a:hover {
  transform: translateY(-1px);
}

button:active,
a:active {
  transform: translateY(0);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-thumb {
  background: hsl(var(--border));
  border-radius: 999px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

.skeleton {
  background: linear-gradient(90deg, hsl(var(--muted) / 0.9), hsl(var(--muted) / 0.45), hsl(var(--muted) / 0.9));
  background-size: 200% 100%;
  animation: shimmer 1.5s linear infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}