:root {
  --background: 218 30% 96%;
  --foreground: 222 42% 10%;
  --primary: 174 86% 36%;
  --primary-foreground: 180 100% 98%;
  --secondary: 222 26% 18%;
  --secondary-foreground: 210 40% 98%;
  --muted: 217 18% 46%;
  --muted-foreground: 217 14% 36%;
  --destructive: 3 86% 60%;
  --destructive-foreground: 0 0% 100%;
  --border: 218 18% 82%;
  --card: 0 0% 100%;
  --card-foreground: 222 42% 10%;
  --ring: 174 86% 36%;
  --shadow-sm: 0 8px 20px hsl(222 42% 10% / 0.08);
  --shadow-md: 0 18px 45px hsl(222 42% 10% / 0.14);
  --shadow-lg: 0 30px 80px hsl(222 42% 10% / 0.22);
  --transition-fast: 140ms ease;
  --transition-smooth: 260ms cubic-bezier(.2,.8,.2,1);
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 28px;
}

.dark {
  --background: 222 47% 5%;
  --foreground: 210 40% 98%;
  --primary: 174 92% 46%;
  --primary-foreground: 222 47% 5%;
  --secondary: 218 32% 16%;
  --secondary-foreground: 210 40% 98%;
  --muted: 217 19% 64%;
  --muted-foreground: 217 19% 72%;
  --destructive: 3 90% 64%;
  --destructive-foreground: 0 0% 100%;
  --border: 218 24% 22%;
  --card: 221 36% 10%;
  --card-foreground: 210 40% 98%;
  --ring: 174 92% 46%;
  --shadow-sm: 0 8px 20px hsl(0 0% 0% / 0.22);
  --shadow-md: 0 18px 45px hsl(0 0% 0% / 0.32);
  --shadow-lg: 0 30px 80px hsl(0 0% 0% / 0.45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: hsl(var(--foreground));
  background:
    radial-gradient(circle at 18% 8%, hsl(var(--primary) / 0.18), transparent 32rem),
    radial-gradient(circle at 88% 18%, hsl(262 88% 60% / 0.16), transparent 28rem),
    linear-gradient(135deg, hsl(var(--background)), hsl(var(--background)) 54%, hsl(var(--secondary) / 0.10));
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }

.metal-card {
  background:
    linear-gradient(145deg, hsl(var(--card) / 0.92), hsl(var(--card) / 0.72)),
    linear-gradient(90deg, hsl(0 0% 100% / 0.12), transparent 30%, hsl(var(--primary) / 0.08));
  border: 1px solid hsl(var(--border) / 0.8);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(18px);
}

.metal-button {
  background: linear-gradient(135deg, hsl(var(--primary)), hsl(190 95% 42%));
  color: hsl(var(--primary-foreground));
  box-shadow: 0 14px 30px hsl(var(--primary) / 0.25), inset 0 1px 0 hsl(0 0% 100% / 0.25);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}
.metal-button:hover { transform: translateY(-1px); filter: brightness(1.05); }
.metal-button:active { transform: translateY(1px) scale(0.99); }

.ghost-button {
  border: 1px solid hsl(var(--border) / 0.75);
  background: hsl(var(--card) / 0.48);
  color: hsl(var(--foreground));
  transition: background var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
}
.ghost-button:hover { background: hsl(var(--primary) / 0.10); border-color: hsl(var(--primary) / 0.45); transform: translateY(-1px); }

.input-shell {
  border: 1px solid hsl(var(--border));
  background: hsl(var(--background) / 0.58);
  color: hsl(var(--foreground));
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.input-shell:focus {
  border-color: hsl(var(--ring));
  box-shadow: 0 0 0 4px hsl(var(--ring) / 0.14);
  background: hsl(var(--card) / 0.9);
}

.range-accent { accent-color: hsl(var(--primary)); }
.toast-pop { animation: toastIn 260ms cubic-bezier(.2,.8,.2,1); }
@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, 18px) scale(0.96); }
  to { opacity: 1; transform: translate(-50%, 0) scale(1); }
}

.card-enter { animation: cardEnter 360ms cubic-bezier(.2,.8,.2,1); }
@keyframes cardEnter {
  from { opacity: 0; transform: translateY(14px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-thumb { background: hsl(var(--primary) / 0.35); border-radius: 999px; }
::-webkit-scrollbar-track { background: hsl(var(--background)); }