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"use client";
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import { useEffect, useState } from "react";
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import { Link, usePathname } from "@/i18n/navigation";
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import { useTranslations } from "next-intl";
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import { AnimatePresence, motion, useReducedMotion } from "motion/react";
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import { Menu, X } from "lucide-react";
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import { cn } from "@/lib/utils";
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import { LocaleSwitcher } from "./locale-switcher";
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const NAV_ITEMS = [
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{ href: "/", key: "home" },
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{ href: "/about", key: "about" },
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] as const;
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/**
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* 站点头部导航。
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*
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* DESIGN.md：粘性白色导航条，高度约 64px，底部分割线 1px hairline-soft。
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* 桌面端横向展示链接与 CTA；移动端（<1024px）折叠为抽屉菜单。
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*/
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export function SiteHeader() {
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const t = useTranslations("Nav");
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const pathname = usePathname();
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const [menuOpen, setMenuOpen] = useState(false);
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const shouldReduceMotion = useReducedMotion();
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// 菜单打开时锁定页面滚动（与外部系统 document.body 同步）
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useEffect(() => {
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if (!menuOpen) {
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return;
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}
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const original = document.body.style.overflow;
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document.body.style.overflow = "hidden";
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return () => {
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document.body.style.overflow = original;
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};
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}, [menuOpen]);
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const isActive = (href: string) =>
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href === "/" ? pathname === "/" : pathname.startsWith(href);
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return (
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<header className="sticky top-0 z-40 border-b border-hairline-soft bg-canvas/85 backdrop-blur-md">
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<div className="mx-auto flex h-16 w-full max-w-[1280px] items-center justify-between gap-md px-lg sm:px-xxl">
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{/* 品牌标识 */}
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<Link
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href="/"
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className="flex items-center gap-xs text-body-md font-semibold text-ink"
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aria-label={t("home")}
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>
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<span
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aria-hidden="true"
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className="grid size-7 place-items-center rounded-md bg-primary font-mono text-caption font-semibold text-brand-green"
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>
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>_
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</span>
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<span className="hidden sm:inline">个人博客</span>
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</Link>
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{/* 桌面端导航 */}
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<nav
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aria-label={t("home")}
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className="hidden items-center gap-xxs md:flex"
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>
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{NAV_ITEMS.map((item) => (
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<Link
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key={item.href}
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href={item.href}
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aria-current={isActive(item.href) ? "page" : undefined}
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className={cn(
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"rounded-full px-md py-xs text-body-sm transition-colors duration-150",
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isActive(item.href)
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? "font-medium text-ink"
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: "text-steel active:bg-surface",
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)}
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>
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{t(item.key)}
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</Link>
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))}
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</nav>
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<div className="flex items-center gap-xxs">
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<LocaleSwitcher />
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{/* GitHub 入口（桌面端） */}
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<a
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href="https://github.com"
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target="_blank"
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rel="noopener noreferrer"
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className="hidden h-9 items-center rounded-full bg-primary px-lg text-button-md text-on-primary transition-colors duration-150 active:bg-charcoal md:inline-flex"
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>
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GitHub
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</a>
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{/* 移动端菜单开关 */}
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<button
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type="button"
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onClick={() => setMenuOpen((value) => !value)}
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aria-expanded={menuOpen}
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aria-controls="mobile-navigation"
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aria-label={menuOpen ? t("closeMenu") : t("openMenu")}
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className="grid size-10 place-items-center rounded-full text-ink transition-colors duration-150 active:bg-surface md:hidden"
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>
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{menuOpen ? (
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<X className="size-5" aria-hidden="true" />
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) : (
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<Menu className="size-5" aria-hidden="true" />
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)}
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</button>
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</div>
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</div>
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{/* 移动端抽屉 */}
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<AnimatePresence>
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{menuOpen ? (
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<motion.nav
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id="mobile-navigation"
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aria-label={t("home")}
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initial={shouldReduceMotion ? false : { opacity: 0, height: 0 }}
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animate={{ opacity: 1, height: "auto" }}
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exit={shouldReduceMotion ? { opacity: 0 } : { opacity: 0, height: 0 }}
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transition={{ duration: 0.2, ease: [0.22, 1, 0.36, 1] }}
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className="overflow-hidden border-t border-hairline-soft bg-canvas md:hidden"
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>
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<ul className="flex flex-col px-lg py-sm sm:px-xxl">
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{NAV_ITEMS.map((item) => (
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<li key={item.href}>
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<Link
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href={item.href}
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// 点击后立即收起抽屉，避免依赖路由变化的副作用
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onClick={() => setMenuOpen(false)}
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aria-current={isActive(item.href) ? "page" : undefined}
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className={cn(
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// 触控目标 ≥ 44px
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"flex min-h-11 items-center rounded-md px-sm text-body-md transition-colors duration-150",
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isActive(item.href)
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? "font-medium text-ink"
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: "text-steel active:bg-surface",
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)}
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>
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{t(item.key)}
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</Link>
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</li>
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))}
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</ul>
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</motion.nav>
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) : null}
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</AnimatePresence>
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</header>
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);
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}
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