Transparent over hero

'use client'

import { useState } from 'react'
import Link from 'next/link'
import { Menu, X } from 'lucide-react'
import { BrandMark } from '@/components/library/brand'
import { ButtonLink } from '@/components/ui/button'
import { productLinks } from '@/content/nav-demo'

/**
 * Transparent-over-hero navbar
 *
 * Sits on top of a dark hero with no background of its own. Two details make
 * it work rather than merely look right: the nav is inside the hero's stacking
 * context so it inherits the inverted ink, and every control keeps a solid
 * focus ring that is visible against imagery.
 */
export default function TransparentHeroNavbar() {
  const [open, setOpen] = useState(false)

  return (
    <div className="relative w-full overflow-hidden bg-surface-inverse text-ink-inverse">
      <div className="grid-paper absolute inset-0 opacity-40" aria-hidden="true" />

      <div className="relative">
        <div className="mx-auto flex h-16 w-full max-w-6xl items-center gap-6 px-4 sm:px-6">
          <Link href="/" className="flex items-center gap-2">
            <BrandMark className="size-5" />
            <span className="display-type text-md font-semibold">Foundry</span>
          </Link>

          <nav aria-label="Transparent example" className="hidden md:block">
            <ul className="flex items-center gap-1">
              {productLinks.slice(0, 3).map((link) => (
                <li key={link.href}>
                  <Link
                    href={link.href}
                    className="flex h-8 items-center rounded-md px-3 text-sm font-medium opacity-80 transition-opacity hover:opacity-100"
                  >
                    {link.label}
                  </Link>
                </li>
              ))}
            </ul>
          </nav>

          <div className="ml-auto hidden items-center gap-2 md:flex">
            <ButtonLink href="/docs/getting-started" size="sm" variant="secondary">
              Documentation
            </ButtonLink>
          </div>

          <button
            type="button"
            onClick={() => setOpen((value) => !value)}
            aria-expanded={open}
            aria-controls="transparent-nav-panel"
            className="ml-auto flex size-9 items-center justify-center rounded-md opacity-80 hover:opacity-100 md:hidden"
          >
            {open ? (
              <X className="size-5" aria-hidden="true" />
            ) : (
              <Menu className="size-5" aria-hidden="true" />
            )}
            <span className="sr-only">{open ? 'Close navigation' : 'Open navigation'}</span>
          </button>
        </div>

        <div
          id="transparent-nav-panel"
          hidden={!open}
          className="border-t border-white/15 md:hidden"
        >
          <nav aria-label="Transparent example, mobile" className="flex flex-col gap-2 px-4 py-4">
            <ul className="flex flex-col gap-0.5">
              {productLinks.map((link) => (
                <li key={link.href}>
                  <Link
                    href={link.href}
                    className="flex min-h-11 items-center rounded-md px-3 text-sm hover:bg-white/10"
                  >
                    {link.label}
                  </Link>
                </li>
              ))}
            </ul>
            <ButtonLink href="/docs/getting-started" size="sm" variant="secondary" block>
              Documentation
            </ButtonLink>
          </nav>
        </div>

        <div className="mx-auto w-full max-w-6xl px-4 pt-16 pb-24 sm:px-6">
          <p className="label-caps opacity-70">Transparent over hero</p>
          <h2 className="display-type mt-3 max-w-2xl text-4xl leading-tight font-semibold sm:text-5xl">
            The navigation is part of the hero, not a bar above it.
          </h2>
          <p className="mt-4 max-w-xl text-md opacity-80">
            Inverted ink is inherited from the hero, so the same markup works on any dark treatment.
          </p>
        </div>
      </div>
    </div>
  )
}

import type { ButtonHTMLAttributes, ReactNode } from 'react'
import Link from 'next/link'
import { cn } from '@/lib/cn'
import { variants } from '@/lib/variants'
import { Spinner } from './spinner'

/**
 * Button
 *
 * The whole action surface of Foundry in one component. It is intentionally a
 * *shared* component (no `'use client'`): rendered from a Server Component it
 * ships zero JavaScript, and it upgrades to a client island automatically when
 * a Client Component imports it.
 *
 * Height, padding and radius resolve from density and radius tokens, so a
 * button restyles itself when the density or palette axis changes. Focus is
 * handled once, globally, by the `:focus-visible` rule in `globals.css`.
 */
const buttonVariants = variants(
  cn(
    'relative inline-flex items-center justify-center gap-2 whitespace-nowrap font-medium',
    'transition-colors duration-150 ease-standard select-none',
    'disabled:pointer-events-none disabled:opacity-50',
    'aria-disabled:pointer-events-none aria-disabled:opacity-50',
  ),
  {
    variants: {
      variant: {
        primary: 'bg-accent text-accent-ink hover:bg-accent-hover active:bg-accent-active',
        secondary: 'bg-surface-inverse text-ink-inverse hover:opacity-90 active:opacity-80',
        outline: 'border border-line-strong bg-surface text-ink hover:bg-surface-sunken',
        ghost: 'text-ink hover:bg-surface-sunken active:bg-surface-sunken',
        destructive: 'bg-danger text-white hover:opacity-90 active:opacity-80',
        success: 'bg-success text-white hover:opacity-90 active:opacity-80',
        warning: 'bg-warning text-white hover:opacity-90 active:opacity-80',
        link: 'text-accent underline underline-offset-4 hover:text-accent-hover',
        soft: 'bg-accent-soft text-accent-soft-ink border border-accent-line hover:brightness-[0.97]',
      },
      size: {
        sm: 'h-control-sm px-3 text-xs rounded-md',
        md: 'h-control px-[var(--density-control-padding-x)] text-sm rounded-md',
        lg: 'h-control-lg px-5 text-base rounded-md',
        icon: 'h-control w-control p-0 rounded-md',
        'icon-sm': 'h-control-sm w-control-sm p-0 rounded-sm',
      },
      block: { true: 'w-full', false: '' },
    },
    defaultVariants: { variant: 'primary', size: 'md', block: false },
    compound: [
      { variant: 'link', size: 'sm', class: 'h-auto px-0' },
      { variant: 'link', size: 'md', class: 'h-auto px-0' },
      { variant: 'link', size: 'lg', class: 'h-auto px-0' },
    ],
  },
)

export type ButtonVariant =
  | 'primary'
  | 'secondary'
  | 'outline'
  | 'ghost'
  | 'destructive'
  | 'success'
  | 'warning'
  | 'link'
  | 'soft'

export type ButtonSize = 'sm' | 'md' | 'lg' | 'icon' | 'icon-sm'

export interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
  variant?: ButtonVariant
  size?: ButtonSize
  block?: boolean
  /** Swaps content for a spinner while preserving the button's measured width. */
  loading?: boolean
  /** Announced by assistive tech while `loading` is true. */
  loadingLabel?: string
  leadingIcon?: ReactNode
  trailingIcon?: ReactNode
}

export function Button({
  variant = 'primary',
  size = 'md',
  block = false,
  loading = false,
  loadingLabel = 'Working',
  leadingIcon,
  trailingIcon,
  className,
  children,
  disabled,
  type = 'button',
  ...props
}: ButtonProps) {
  return (
    <button
      type={type}
      className={buttonVariants({ variant, size, block, className })}
      disabled={disabled ?? loading}
      aria-busy={loading || undefined}
      {...props}
    >
      {loading ? (
        <>
          {/* Label stays in the DOM but hidden so the control never collapses
              to spinner width halfway through an interaction. */}
          <span className="invisible flex items-center gap-2" aria-hidden="true">
            {leadingIcon}
            {children}
            {trailingIcon}
          </span>
          <span className="absolute inset-0 flex items-center justify-center">
            <Spinner size="sm" />
            <span className="sr-only">{loadingLabel}</span>
          </span>
        </>
      ) : (
        <>
          {leadingIcon}
          {children}
          {trailingIcon}
        </>
      )}
    </button>
  )
}

export interface ButtonLinkProps {
  href: string
  variant?: ButtonVariant
  size?: ButtonSize
  block?: boolean
  className?: string
  children?: ReactNode
  leadingIcon?: ReactNode
  trailingIcon?: ReactNode
  'aria-label'?: string
  'aria-current'?: 'page' | 'step' | 'true' | undefined
  target?: string
  rel?: string
  prefetch?: boolean
}

/** Anchor styled as a button, for when the action is really navigation. */
export function ButtonLink({
  href,
  variant = 'primary',
  size = 'md',
  block = false,
  className,
  children,
  leadingIcon,
  trailingIcon,
  ...props
}: ButtonLinkProps) {
  return (
    <Link href={href} className={buttonVariants({ variant, size, block, className })} {...props}>
      {leadingIcon}
      {children}
      {trailingIcon}
    </Link>
  )
}

export { buttonVariants }