:root {
  --background: 214 38% 97%;
  --foreground: 222 47% 11%;
  --primary: 222 82% 42%;
  --primary-foreground: 0 0% 100%;
  --secondary: 186 86% 30%;
  --secondary-foreground: 0 0% 100%;
  --muted: 214 32% 91%;
  --muted-foreground: 215 21% 34%;
  --destructive: 0 72% 43%;
  --destructive-foreground: 0 0% 100%;
  --border: 214 24% 80%;
  --card: 0 0% 100%;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 14px 34px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 28px 76px rgba(15, 23, 42, 0.18);
  --transition-fast: 140ms ease;
  --transition-smooth: 260ms cubic-bezier(.2,.8,.2,1);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
}

.dark {
  --background: 222 47% 7%;
  --foreground: 210 40% 98%;
  --primary: 217 91% 64%;
  --primary-foreground: 222 47% 8%;
  --secondary: 181 72% 52%;
  --secondary-foreground: 222 47% 8%;
  --muted: 222 32% 15%;
  --muted-foreground: 215 20% 78%;
  --destructive: 0 84% 64%;
  --destructive-foreground: 0 0% 100%;
  --border: 222 25% 24%;
  --card: 222 39% 11%;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: hsl(var(--foreground));
  background:
    radial-gradient(circle at top left, hsl(var(--secondary) / 0.18), transparent 32rem),
    radial-gradient(circle at bottom right, hsl(var(--primary) / 0.14), transparent 34rem),
    linear-gradient(135deg, hsl(var(--background)), hsl(var(--muted) / 0.62));
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button, input, textarea { font: inherit; }
button { cursor: pointer; }
::selection { background: hsl(var(--secondary) / 0.28); }

.app-shell {
  min-height: 100vh;
}

.brand-rhythm {
  background-image: linear-gradient(90deg, hsl(var(--primary)) 0 72%, hsl(var(--secondary)) 72% 100%);
}

.focus-ring:focus-visible {
  outline: 3px solid hsl(var(--secondary) / 0.45);
  outline-offset: 2px;
}

.chat-scroll::-webkit-scrollbar { width: 9px; }
.chat-scroll::-webkit-scrollbar-track { background: transparent; }
.chat-scroll::-webkit-scrollbar-thumb {
  background: hsl(var(--border));
  border-radius: 999px;
}

.message-enter {
  animation: riseIn 260ms ease both;
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(8px) scale(.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.glass-card {
  background: hsl(var(--card) / 0.92);
  backdrop-filter: blur(18px);
  border: 1px solid hsl(var(--border));
  box-shadow: var(--shadow-md);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}