:root {
  --background: 232 33% 7%;
  --foreground: 214 32% 94%;
  --primary: 195 95% 56%;
  --secondary: 274 73% 63%;
  --muted: 222 20% 16%;
  --destructive: 3 84% 62%;
  --border: 220 24% 22%;
  --card: 228 27% 10%;
  --shadow-sm: 0 8px 24px hsla(233, 50%, 3%, 0.18);
  --shadow-md: 0 14px 34px hsla(233, 50%, 3%, 0.28);
  --shadow-lg: 0 24px 80px hsla(233, 50%, 3%, 0.45);
  --transition-fast: 160ms ease;
  --transition-smooth: 320ms cubic-bezier(0.22, 1, 0.36, 1);
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 28px;
}

.dark {
  --background: 232 33% 7%;
  --foreground: 214 32% 94%;
  --primary: 195 95% 56%;
  --secondary: 274 73% 63%;
  --muted: 222 20% 16%;
  --destructive: 3 84% 62%;
  --border: 220 24% 22%;
  --card: 228 27% 10%;
}

* {
  box-sizing: border-box;
}

html, body, #root {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  background:
    radial-gradient(circle at top left, hsla(195, 95%, 56%, 0.12), transparent 30%),
    radial-gradient(circle at top right, hsla(274, 73%, 63%, 0.12), transparent 30%),
    linear-gradient(180deg, hsl(var(--background)), hsl(230 30% 6%));
}

.glass {
  background: linear-gradient(180deg, hsla(0, 0%, 100%, 0.05), hsla(0, 0%, 100%, 0.03));
  backdrop-filter: blur(18px);
  border: 1px solid hsl(var(--border) / 0.7);
  box-shadow: var(--shadow-md);
}

.card-gradient {
  background: linear-gradient(135deg, hsl(var(--card) / 0.92), hsl(var(--muted) / 0.82));
}

.text-gradient {
  background: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--secondary)));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.grid-bg {
  background-image:
    linear-gradient(hsl(var(--border) / 0.16) 1px, transparent 1px),
    linear-gradient(90deg, hsl(var(--border) / 0.16) 1px, transparent 1px);
  background-size: 32px 32px;
}

.chessboard {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid hsl(var(--border));
}

.square-light {
  background: hsl(44 38% 75%);
}

.square-dark {
  background: hsl(26 31% 42%);
}

.square-highlight {
  box-shadow: inset 0 0 0 3px hsl(var(--primary));
}

.pulse-ring {
  position: relative;
}

.pulse-ring::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: inherit;
  border: 1px solid hsl(var(--primary) / 0.35);
  animation: pulse 2.2s infinite;
}

@keyframes pulse {
  0% { opacity: 0.7; transform: scale(0.98); }
  70% { opacity: 0; transform: scale(1.04); }
  100% { opacity: 0; transform: scale(1.04); }
}

.fade-up {
  animation: fadeUp var(--transition-smooth) both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

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

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

.recharts-default-tooltip {
  border-radius: 16px !important;
  border: 1px solid hsl(var(--border)) !important;
  background: hsl(var(--card) / 0.96) !important;
}

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

button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid hsl(var(--primary));
  outline-offset: 2px;
}

input::placeholder {
  color: hsl(var(--foreground) / 0.45);
}