CleanMM/Apps/LandingSite/src/components/NavBar.astro

---
import CtaButton from './CtaButton.astro';
import { t, type Locale } from '../i18n/utils';
import { getRelease, getDownloadUrl } from '../data/release';

interface Props {
  locale: Locale;
}

const { locale } = Astro.props;
const copy = t(locale);
const manifest = getRelease();
const downloadUrl = getDownloadUrl(manifest);
const altLocale = locale === 'zh' ? 'en' : 'zh';
const altPath = locale === 'zh' ? '/en/' : '/zh/';
const altLabel = locale === 'zh' ? 'EN' : '中文';

const navItems = [
  { label: copy.nav.whyAtlas, href: '#why' },
  { label: copy.nav.howItWorks, href: '#how' },
  { label: copy.nav.developers, href: '#developers' },
  { label: copy.nav.safety, href: '#safety' },
  { label: copy.nav.faq, href: '#faq' },
];
---

<header class="navbar" id="navbar">
  <nav class="navbar__inner container" aria-label="Main navigation">
    <a href={`/${locale}/`} class="navbar__brand" aria-label="Atlas for Mac">
      <img src="/images/atlas-icon.png" alt="" width="32" height="32" class="navbar__logo" />
      <span class="navbar__wordmark">Atlas</span>
    </a>

    <ul class="navbar__links" id="nav-links">
      {navItems.map((item) => (
        <li><a href={item.href} class="navbar__link">{item.label}</a></li>
      ))}
    </ul>

    <div class="navbar__actions">
      <button class="navbar__theme-toggle" id="theme-toggle" aria-label="Toggle theme" title="Toggle theme">
        <svg class="navbar__theme-icon navbar__theme-icon--sun" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
          <circle cx="12" cy="12" r="5"/>
          <line x1="12" y1="1" x2="12" y2="3"/>
          <line x1="12" y1="21" x2="12" y2="23"/>
          <line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/>
          <line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/>
          <line x1="1" y1="12" x2="3" y2="12"/>
          <line x1="21" y1="12" x2="23" y2="12"/>
          <line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/>
          <line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/>
        </svg>
        <svg class="navbar__theme-icon navbar__theme-icon--moon" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
          <path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/>
        </svg>
      </button>
      <a href={altPath} class="navbar__lang" aria-label={`Switch to ${altLabel}`}>
        {altLabel}
      </a>
      <CtaButton
        label={copy.nav.download}
        href={downloadUrl}
        variant="primary"
        class="navbar__cta"
      />
      <button class="navbar__menu-btn" id="menu-btn" aria-label="Menu" aria-expanded="false">
        <svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round">
          <line x1="3" y1="6" x2="21" y2="6" />
          <line x1="3" y1="12" x2="21" y2="12" />
          <line x1="3" y1="18" x2="21" y2="18" />
        </svg>
      </button>
    </div>
  </nav>
</header>

<script>
  const btn = document.getElementById('menu-btn');
  const links = document.getElementById('nav-links');
  if (btn && links) {
    btn.addEventListener('click', () => {
      const expanded = btn.getAttribute('aria-expanded') === 'true';
      btn.setAttribute('aria-expanded', String(!expanded));
      links.classList.toggle('is-open');
    });
  }

  // Sticky background on scroll
  let ticking = false;
  const navbar = document.getElementById('navbar');
  window.addEventListener('scroll', () => {
    if (!ticking) {
      requestAnimationFrame(() => {
        if (navbar) {
          navbar.classList.toggle('is-scrolled', window.scrollY > 40);
        }
        ticking = false;
      });
      ticking = true;
    }
  });

  // Theme toggle
  const themeToggle = document.getElementById('theme-toggle');
  if (themeToggle) {
    themeToggle.addEventListener('click', () => {
      const html = document.documentElement;
      const current = html.getAttribute('data-theme');
      const next = current === 'dark' ? 'light' : 'dark';
      html.setAttribute('data-theme', next);
      localStorage.setItem('atlas-theme', next);
    });
  }
</script>

<style>
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding-block: var(--atlas-space-md);
    transition: background-color var(--atlas-motion-standard),
                backdrop-filter var(--atlas-motion-standard);
  }

  .navbar.is-scrolled {
    background-color: var(--atlas-navbar-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--atlas-color-border);
  }

  .navbar__inner {
    display: flex;
    align-items: center;
    gap: var(--atlas-space-xxl);
  }

  .navbar__brand {
    display: flex;
    align-items: center;
    gap: var(--atlas-space-sm);
    text-decoration: none;
    flex-shrink: 0;
  }

  .navbar__logo {
    width: 32px;
    height: 32px;
    border-radius: var(--atlas-radius-sm);
  }

  .navbar__wordmark {
    font-family: var(--atlas-font-display);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--atlas-color-text-primary);
  }

  .navbar__links {
    display: flex;
    align-items: center;
    gap: var(--atlas-space-xxl);
    flex: 1;
  }

  .navbar__link {
    font-size: var(--atlas-text-body-small);
    color: var(--atlas-color-text-secondary);
    text-decoration: none;
    transition: color var(--atlas-motion-fast);
    white-space: nowrap;
  }

  .navbar__link:hover {
    color: var(--atlas-color-text-primary);
  }

  .navbar__actions {
    display: flex;
    align-items: center;
    gap: var(--atlas-space-lg);
    flex-shrink: 0;
  }

  .navbar__theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--atlas-radius-sm);
    border: 1px solid var(--atlas-color-border);
    background: transparent;
    color: var(--atlas-color-text-secondary);
    cursor: pointer;
    transition: color var(--atlas-motion-fast),
                border-color var(--atlas-motion-fast);
  }

  .navbar__theme-toggle:hover {
    color: var(--atlas-color-text-primary);
    border-color: var(--atlas-color-border-emphasis);
  }

  /* Show sun in dark mode, moon in light mode */
  .navbar__theme-icon--moon { display: none; }
  .navbar__theme-icon--sun { display: block; }

  [data-theme="light"] .navbar__theme-icon--sun { display: none; }
  [data-theme="light"] .navbar__theme-icon--moon { display: block; }

  .navbar__lang {
    font-family: var(--atlas-font-mono);
    font-size: var(--atlas-text-caption);
    font-weight: 500;
    color: var(--atlas-color-text-secondary);
    text-decoration: none;
    padding: var(--atlas-space-xxs) var(--atlas-space-sm);
    border: 1px solid var(--atlas-color-border);
    border-radius: var(--atlas-radius-sm);
    transition: color var(--atlas-motion-fast),
                border-color var(--atlas-motion-fast);
  }

  .navbar__lang:hover {
    color: var(--atlas-color-text-primary);
    border-color: var(--atlas-color-border-emphasis);
  }

  .navbar__menu-btn {
    display: none;
    color: var(--atlas-color-text-secondary);
  }

  @media (max-width: 860px) {
    .navbar__links {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      flex-direction: column;
      padding: var(--atlas-space-xl);
      background-color: var(--atlas-mobile-menu-bg);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--atlas-color-border);
      gap: var(--atlas-space-lg);
    }

    .navbar__links.is-open {
      display: flex;
    }

    .navbar__menu-btn {
      display: block;
    }

    :global(.navbar__cta) {
      display: none;
    }
  }
</style>