File Drop Zone

Create a File Drop Zone component for an AI-generated interface using shadcn-style composition. Use shadcn/ui input + button as the implementation base. The component should support default, muted, error, disabled variants and default, hover, focus-visible, disabled, error, filled states. Include clear anatomy for Root, Drop target, Icon, Instructions, Browse action. Keep the visual language black, white, and gray with subtle borders, practical spacing, accessible focus states, and no decorative noise.

Do not invent a custom component API when shadcn/ui input + button already covers the base behavior. Avoid random gradients, oversized radii, unclear disabled states, missing labels, icon-only controls without accessible names, and variants that change layout unexpectedly.

Base: shadcn/ui input + button
Primitive: none
Tailwind: Use shadcn tokens for background, border, ring, muted text, radius, and state variants. Keep component-specific classes local and copyable.
Dependency: No extra primitive required beyond React and Tailwind.

{
  "id": "file-drop-zone",
  "category": "components",
  "trigger": "user interaction",
  "target": "file drop zone",
  "feeling": [
    "polished",
    "practical",
    "precise"
  ],
  "palette": [
    "black",
    "white",
    "gray"
  ],
  "radius": "8px or less",
  "border": "1px solid rgba(237, 237, 236, 0.14)",
  "background": "neutral surface with subtle contrast",
  "foreground": "high-contrast text",
  "mutedForeground": "secondary text at 68-74% contrast",
  "focusRing": "2px neutral ring with offset",
  "shadow": "soft elevation only when interaction needs tactility",
  "motionDuration": "120ms-220ms"
}