kotobane/components/layout/NavbarClient.tsx

'use client'

import { useState, useEffect } from 'react'
import Link from 'next/link'
import { usePathname } from 'next/navigation'
import { Search, Menu, X } from 'lucide-react'
import type { Category } from '@/lib/types'

interface Props {
  categories: Category[]
}

export default function NavbarClient({ categories }: Props) {
  const pathname = usePathname()
  const [menuOpen, setMenuOpen] = useState(false)

  useEffect(() => {
    setMenuOpen(false)
  }, [pathname])

  useEffect(() => {
    if (menuOpen) {
      document.body.style.overflow = 'hidden'
    } else {
      document.body.style.overflow = ''
    }
    return () => { document.body.style.overflow = '' }
  }, [menuOpen])

  function openSearch() {
    window.dispatchEvent(new CustomEvent('kotobane:open-search'))
  }

  return (
    <>
      <nav className="bg-bg-elevated border-b border-border sticky top-0 z-40">
        <div className="max-w-[1200px] mx-auto px-4 h-14 flex items-center">
          {/* Mobile hamburger */}
          <button
            onClick={() => setMenuOpen(true)}
            className="sm:hidden text-text-muted hover:text-text-secondary transition-colors w-10"
            aria-label="Open menu"
          >
            <Menu size={20} />
          </button>

          {/* Logo — truly centered on mobile */}
          <Link
            href="/"
            className="text-lg font-black text-accent tracking-[3px] sm:mr-6 sm:ml-0 absolute left-1/2 -translate-x-1/2 sm:static sm:translate-x-0"
          >
            言羽
          </Link>

          {/* Spacer to balance hamburger on mobile */}
          <div className="sm:hidden w-10" />

          {/* Desktop nav links */}
          <div className="hidden sm:flex items-center gap-1 flex-1 overflow-x-auto">
            <div className="w-px h-4 bg-border shrink-0 mr-4" />
            {categories.map((cat) => {
              const isActive = pathname.startsWith(`/${cat.slug}`)
              return (
                <Link
                  key={cat.slug}
                  href={`/${cat.slug}`}
                  className={`text-xs font-medium px-3 py-1 rounded-sm whitespace-nowrap transition-colors outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-2 focus-visible:ring-offset-bg-elevated ${
                    isActive
                      ? 'text-accent'
                      : 'text-text-muted hover:text-text-secondary'
                  }`}
                >
                  {cat.name}
                </Link>
              )
            })}
          </div>

          {/* Search */}
          <button
            onClick={openSearch}
            className="ml-auto sm:ml-0 flex items-center gap-2 text-text-muted hover:text-text-secondary transition-colors shrink-0"
            aria-label="Open search"
          >
            <Search size={16} />
            <kbd className="hidden sm:inline-flex bg-bg-card border border-border rounded px-1.5 py-0.5 text-[10px] font-mono">
              ⌘K
            </kbd>
          </button>
        </div>
      </nav>

      {/* Mobile overlay */}
      {menuOpen && (
        <div className="fixed inset-0 z-50 sm:hidden">
          <div className="absolute inset-0 bg-black/60" onClick={() => setMenuOpen(false)} />
          <div className="relative w-full h-full bg-bg-elevated flex flex-col">
            {/* Overlay header */}
            <div className="flex items-center justify-between px-4 h-14 border-b border-border">
              <span className="text-lg font-black text-accent tracking-[3px]">言羽</span>
              <button
                onClick={() => setMenuOpen(false)}
                className="text-text-muted hover:text-text-secondary transition-colors"
                aria-label="Close menu"
              >
                <X size={22} />
              </button>
            </div>

            {/* Category list */}
            <div className="flex-1 overflow-y-auto py-4">
              {categories.map((cat) => {
                const isActive = pathname.startsWith(`/${cat.slug}`)
                return (
                  <Link
                    key={cat.slug}
                    href={`/${cat.slug}`}
                    className={`block px-6 py-3.5 text-sm font-medium transition-colors ${
                      isActive
                        ? 'text-accent bg-bg-card border-l-2 border-accent'
                        : 'text-text-muted hover:text-text-secondary hover:bg-bg-card'
                    }`}
                  >
                    {cat.name}
                    {cat.description && (
                      <span className="block text-[11px] text-text-disabled font-normal mt-0.5">
                        {cat.description}
                      </span>
                    )}
                  </Link>
                )
              })}
            </div>
          </div>
        </div>
      )}
    </>
  )
}