---
const navItems = [
  { href: '/', label: '首页', match: 'index' },
  { href: '/posts', label: '文章', match: 'posts' },
  { href: '/tags', label: '标签', match: 'tags' },
  { href: '/archives', label: '归档', match: 'archives' },
  { href: '/about', label: '关于', match: 'about' },
];

const path = Astro.url.pathname.replace(/\/+$/, '').replace(/^\//, '');
const current = path === '' ? 'index' : path.split('/')[0];
---

<header id="nav" class="nav glass" data-scrolled="0">
  <div class="container nav-inner">
    <a href="/" class="brand">
      <span class="brand-mark">Y</span>
      <span class="brand-text">Yukun<span class="apos">&rsquo;</span>s Blog</span>
    </a>

    <nav class="nav-links" aria-label="主导航">
      {
        navItems.map((item) => (
          <a
            href={item.href}
            class:list={['nav-link', { active: current === item.match }]}
            aria-current={current === item.match ? 'page' : undefined}
          >
            {item.label}
          </a>
        ))
      }
    </nav>

    <button id="search-trigger" class="nav-search" aria-label="搜索文章" title="搜索 (Ctrl+K)">
      <svg viewBox="0 0 24 24" width="18" height="18" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round">
        <circle cx="11" cy="11" r="7" />
        <line x1="21" y1="21" x2="16.5" y2="16.5" />
      </svg>
      <span class="kbd">Ctrl K</span>
    </button>

    <button id="menu-toggle" class="menu-toggle" aria-label="菜单" aria-expanded="false">
      <span></span><span></span><span></span>
    </button>
  </div>

  <div id="mobile-menu" class="mobile-menu" data-open="0">
    {navItems.map((item) => (
      <a href={item.href} class:list={['mobile-link', { active: current === item.match }]}>{item.label}</a>
    ))}
    <button id="search-trigger-mobile" class="mobile-search">搜索文章</button>
  </div>
</header>

<style>
  .nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 90;
    height: var(--nav-h);
    display: flex;
    align-items: center;
    background: transparent;
    border: 0;
    box-shadow: none;
    transition: background 0.35s, box-shadow 0.35s, border-color 0.35s, backdrop-filter 0.35s;
  }
  .nav[data-scrolled='1'] {
    background: var(--glass);
    backdrop-filter: blur(22px) saturate(160%);
    -webkit-backdrop-filter: blur(22px) saturate(160%);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 4px 24px rgba(31, 96, 160, 0.08);
  }
  .nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    height: 100%;
  }
  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--ink);
    letter-spacing: -0.02em;
  }
  .brand:hover { color: var(--ink); }
  .brand-mark {
    display: grid;
    place-items: center;
    width: 30px; height: 30px;
    border-radius: 9px;
    background: linear-gradient(135deg, var(--blue-500), var(--cyan-400));
    color: #fff;
    font-size: 1rem;
    box-shadow: 0 4px 12px rgba(47, 127, 224, 0.4);
  }
  .brand-text .apos { color: var(--blue-400); }
  .nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
  }
  .nav-link {
    position: relative;
    padding: 8px 14px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--ink-soft);
    transition: color 0.2s, background 0.2s;
  }
  .nav-link:hover { color: var(--blue-600); background: rgba(132, 194, 255, 0.14); }
  .nav-link.active { color: var(--blue-600); background: rgba(132, 194, 255, 0.2); }
  .nav-link.active::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 1px;
    transform: translateX(-50%);
    width: 5px; height: 5px;
    border-radius: 50%;
    background: var(--blue-500);
  }
  .nav-search {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.4);
    color: var(--ink-soft);
    cursor: pointer;
    transition: all 0.2s;
  }
  .nav-search:hover { border-color: var(--blue-300); color: var(--blue-600); }
  .kbd {
    font-size: 0.72rem;
    font-family: var(--font-mono);
    padding: 2px 6px;
    border-radius: 5px;
    background: rgba(132, 194, 255, 0.18);
    color: var(--blue-700);
  }
  .menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    background: none;
    border: 0;
    cursor: pointer;
  }
  .menu-toggle span {
    width: 22px; height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
  }
  .mobile-menu {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 12px 16px 16px;
  }
  .mobile-link {
    padding: 12px 14px;
    border-radius: 12px;
    font-weight: 600;
    color: var(--ink);
  }
  .mobile-link.active { background: rgba(132, 194, 255, 0.2); color: var(--blue-600); }
  .mobile-search {
    margin-top: 6px;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.5);
    text-align: left;
    cursor: pointer;
    color: var(--ink-soft);
  }

  /* 移动端：折叠菜单 */
  @media (max-width: 768px) {
    .nav-links, .nav-search { display: none; }
    .menu-toggle { display: flex; }
    .nav[data-scrolled='1'] .mobile-menu,
    .mobile-menu[data-open='1'] {
      display: flex;
      border-top: 1px solid var(--glass-border);
      background: var(--glass-strong);
      backdrop-filter: blur(22px) saturate(160%);
      -webkit-backdrop-filter: blur(22px) saturate(160%);
    }
    .menu-toggle[aria-expanded='true'] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .menu-toggle[aria-expanded='true'] span:nth-child(2) { opacity: 0; }
    .menu-toggle[aria-expanded='true'] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
    .mobile-menu[data-open='0'] { display: none; }
  }
</style>

<script>
  // 菜单展开
  const toggle = document.getElementById('menu-toggle');
  const menu = document.getElementById('mobile-menu');
  toggle?.addEventListener('click', () => {
    const open = menu?.dataset.open === '1';
    menu!.dataset.open = open ? '0' : '1';
    toggle!.setAttribute('aria-expanded', String(!open));
  });
</script>