// ===== Initialize Lucide Icons =====
lucide.createIcons();

// ===== Navbar Scroll Effect =====
const navbar = document.getElementById('navbar');
window.addEventListener('scroll', () => {
  if (window.scrollY > 50) {
    navbar.classList.add('scrolled');
  } else {
    navbar.classList.remove('scrolled');
  }
});

// ===== Mobile Menu Toggle =====
const mobileMenuBtn = document.getElementById('mobileMenuBtn');
const mobileMenu = document.getElementById('mobileMenu');
let menuOpen = false;

mobileMenuBtn.addEventListener('click', () => {
  menuOpen = !menuOpen;
  mobileMenu.classList.toggle('hidden', !menuOpen);
});

// Close mobile menu when clicking a link
document.querySelectorAll('.mobile-nav-link').forEach(link => {
  link.addEventListener('click', () => {
    menuOpen = false;
    mobileMenu.classList.add('hidden');
  });
});

// ===== Section Reveal Animation =====
const revealElements = document.querySelectorAll('.reveal');
const revealObserver = new IntersectionObserver((entries) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      entry.target.classList.add('visible');
    }
  });
}, { threshold: 0.1 });

revealElements.forEach(el => revealObserver.observe(el));

// ===== Fetch YouTube Videos =====
const CHANNEL_HANDLE = 'binarybeats_ai';
const loadingState = document.getElementById('loadingState');
const errorState = document.getElementById('errorState');
const featuredVideo = document.getElementById('featuredVideo');
const videoGridRest = document.getElementById('videoGridRest');

const PIPED_INSTANCES = [
  'https://pipedapi.kavin.rocks',
  'https://pipedapi.adminforge.de',
  'https://pipedapi.in.projectsegfau.lt',
  'https://pipedapi.r4fo.com',
  'https://pipedapi.darkness.services',
];

const INVIDIOUS_INSTANCES = [
  'https://vid.puffyan.us',
  'https://inv.nadeko.net',
  'https://invidious.nerdvpn.de',
  'https://iv.ggtyler.dev',
  'https://invidious.privacyredirect.com',
  'https://yewtu.be',
];

const CORS_PROXIES = [
  'https://api.allorigins.win/raw?url=',
  'https://corsproxy.io/?',
  'https://api.codetabs.com/v1/proxy?quest=',
];

async function fetchWithTimeout(url, timeout = 10000) {
  const controller = new AbortController();
  const id = setTimeout(() => controller.abort(), timeout);
  try {
    const response = await fetch(url, { signal: controller.signal });
    clearTimeout(id);
    return response;
  } catch (e) {
    clearTimeout(id);
    throw e;
  }
}

function normalizePipedStream(stream) {
  return {
    videoId: stream.url?.replace('/watch?v=', '') || '',
    title: stream.title || 'Untitled',
    description: '',
    videoThumbnails: stream.thumbnail ? [
      { url: stream.thumbnail, quality: 'maxres' },
      { url: stream.thumbnail, quality: 'high' },
    ] : [],
    published: stream.uploaded ? Math.floor(stream.uploaded / 1000) : null,
    lengthSeconds: stream.duration || 0,
    viewCount: stream.views || 0,
  };
}

function normalizeInvidiousVideo(video) {
  return {
    videoId: video.videoId || '',
    title: video.title || 'Untitled',
    description: video.description || '',
    videoThumbnails: video.videoThumbnails || [],
    published: video.published || null,
    lengthSeconds: video.lengthSeconds || 0,
    viewCount: video.viewCount || 0,
  };
}

// ===== Discover YouTube Channel ID from page HTML =====
async function discoverChannelId() {
  for (const proxy of CORS_PROXIES) {
    try {
      const ytUrl = encodeURIComponent(`https://www.youtube.com/@${CHANNEL_HANDLE}`);
      const res = await fetchWithTimeout(`${proxy}${ytUrl}`, 12000);
      if (!res.ok) continue;
      const html = await res.text();

      // Try multiple patterns to extract channel ID from YouTube page
      const patterns = [
        /\"channelId\":\"(UC[^\"]+)\"/,
        /channel_id=(UC[a-zA-Z0-9_-]+)/,
        /\"externalId\":\"(UC[^\"]+)\"/,
        /youtube\.com\/channel\/(UC[a-zA-Z0-9_-]+)/,
        /<meta\s+itemprop="channelId"\s+content="(UC[^"]+)"/,
        /\" channelId\":\"(UC[^\"]+)\"/,
      ];

      for (const pattern of patterns) {
        const match = html.match(pattern);
        if (match) {
          console.log(`✅ Discovered channel ID: ${match[1]} via ${proxy}`);
          return match[1];
        }
      }
    } catch (e) {
      console.warn(`Channel ID discovery via ${proxy} failed:`, e.message);
    }
  }
  return null;
}

// ===== Fetch videos via rss2json.com (most reliable CORS-friendly method) =====
async function fetchViaRss2Json(channelId) {
  try {
    const rssUrl = `https://www.youtube.com/feeds/videos.xml?channel_id=${channelId}`;
    const url = `https://api.rss2json.com/v1/api.json?rss_url=${encodeURIComponent(rssUrl)}`;
    const res = await fetchWithTimeout(url, 10000);
    if (!res.ok) return null;
    const data = await res.json();
    if (data.status === 'ok' && data.items?.length) {
      console.log(`✅ rss2json succeeded with ${data.items.length} videos`);
      return data.items.slice(0, 10).map(item => {
        const videoId = item.link?.match(/[?&]v=([^&]+)/)?.[1] ||
          item.guid?.replace('yt:video:', '') || '';
        const thumbnail = item.thumbnail ||
          `https://i.ytimg.com/vi/${videoId}/hqdefault.jpg`;
        return {
          videoId,
          title: item.title || 'Untitled',
          description: '',
          videoThumbnails: [
            { url: `https://i.ytimg.com/vi/${videoId}/maxresdefault.jpg`, quality: 'maxres' },
            { url: `https://i.ytimg.com/vi/${videoId}/sddefault.jpg`, quality: 'high' },
            { url: thumbnail, quality: 'medium' },
          ],
          published: item.pubDate ? Math.floor(new Date(item.pubDate).getTime() / 1000) : null,
          lengthSeconds: 0,
          viewCount: 0,
        };
      });
    }
  } catch (e) {
    console.warn('rss2json failed:', e.message);
  }
  return null;
}

async function fetchChannelVideos() {
  // Method 1: Discover channel ID, then use rss2json.com (most reliable CORS-friendly approach)
  const channelId = await discoverChannelId();
  if (channelId) {
    const videos = await fetchViaRss2Json(channelId);
    if (videos) return videos;
  }

  // Method 2: Piped API directly (supports channel handles)
  for (const instance of PIPED_INSTANCES) {
    try {
      const res = await fetchWithTimeout(`${instance}/c/${CHANNEL_HANDLE}`);
      if (!res.ok) continue;
      const data = await res.json();
      if (data.relatedStreams?.length) {
        console.log(`✅ Piped direct succeeded: ${instance}`);
        return data.relatedStreams.slice(0, 10).map(normalizePipedStream);
      }
    } catch (e) {
      console.warn(`Piped direct ${instance} failed:`, e.message);
    }
  }

  // Method 3: Piped API via CORS proxy
  for (const instance of PIPED_INSTANCES) {
    for (const proxy of CORS_PROXIES) {
      try {
        const encodedUrl = encodeURIComponent(`${instance}/c/${CHANNEL_HANDLE}`);
        const res = await fetchWithTimeout(`${proxy}${encodedUrl}`);
        if (!res.ok) continue;
        const data = await res.json();
        if (data.relatedStreams?.length) {
          console.log(`✅ Piped proxy succeeded: ${proxy} → ${instance}`);
          return data.relatedStreams.slice(0, 10).map(normalizePipedStream);
        }
      } catch (e) {
        console.warn(`Piped proxy ${proxy}→${instance} failed:`, e.message);
      }
    }
  }

  // Method 4: Invidious API directly
  for (const instance of INVIDIOUS_INSTANCES) {
    try {
      const res = await fetchWithTimeout(`${instance}/api/v1/channels/${CHANNEL_HANDLE}`);
      if (res.ok) {
        const data = await res.json();
        if (data?.authorId) {
          const videosRes = await fetchWithTimeout(`${instance}/api/v1/channels/${data.authorId}/videos?sort_by=newest`);
          if (videosRes.ok) {
            const videosData = await videosRes.json();
            const videos = videosData.videos || videosData;
            if (videos?.length) {
              console.log(`✅ Invidious direct succeeded: ${instance}`);
              return videos.slice(0, 10).map(normalizeInvidiousVideo);
            }
          }
        }
      }

      // Fallback: search for the channel
      const searchRes = await fetchWithTimeout(`${instance}/api/v1/search?q=${CHANNEL_HANDLE}&type=channel`);
      if (!searchRes.ok) continue;
      const searchData = await searchRes.json();
      const channel = searchData?.find(r => r.type === 'channel');
      if (!channel) continue;

      const videosRes = await fetchWithTimeout(`${instance}/api/v1/channels/${channel.authorId}/videos?sort_by=newest`);
      if (!videosRes.ok) continue;
      const videosData = await videosRes.json();
      const videos = videosData.videos || videosData;
      if (videos?.length) {
        console.log(`✅ Invidious search succeeded: ${instance}`);
        return videos.slice(0, 10).map(normalizeInvidiousVideo);
      }
    } catch (e) {
      console.warn(`Invidious direct ${instance} failed:`, e.message);
    }
  }

  // Method 5: Invidious API via CORS proxy
  for (const instance of INVIDIOUS_INSTANCES) {
    for (const proxy of CORS_PROXIES) {
      try {
        const encodedUrl = encodeURIComponent(`${instance}/api/v1/channels/${CHANNEL_HANDLE}`);
        const res = await fetchWithTimeout(`${proxy}${encodedUrl}`);
        if (!res.ok) continue;
        const data = await res.json();
        if (data?.authorId) {
          const vidEncodedUrl = encodeURIComponent(`${instance}/api/v1/channels/${data.authorId}/videos?sort_by=newest`);
          const videosRes = await fetchWithTimeout(`${proxy}${vidEncodedUrl}`);
          if (!videosRes.ok) continue;
          const videosData = await videosRes.json();
          const videos = videosData.videos || videosData;
          if (videos?.length) {
            console.log(`✅ Invidious proxy succeeded: ${proxy}→${instance}`);
            return videos.slice(0, 10).map(normalizeInvidiousVideo);
          }
        }
      } catch (e) {
        console.warn(`Invidious proxy ${proxy}→${instance} failed:`, e.message);
      }
    }
  }

  // Method 6: YouTube RSS feed via CORS proxy (direct XML parsing)
  if (channelId) {
    for (const proxy of CORS_PROXIES) {
      try {
        const rssUrl = encodeURIComponent(`https://www.youtube.com/feeds/videos.xml?channel_id=${channelId}`);
        const rssRes = await fetchWithTimeout(`${proxy}${rssUrl}`);
        if (!rssRes.ok) continue;
        const rssText = await rssRes.text();

        const parser = new DOMParser();
        const doc = parser.parseFromString(rssText, 'text/xml');
        const entries = doc.querySelectorAll('entry');

        if (entries.length) {
          console.log(`✅ YouTube RSS direct succeeded: ${proxy}`);
          return Array.from(entries).slice(0, 10).map(entry => {
            const videoId = entry.querySelector('videoId')?.textContent ||
              entry.querySelector('link')?.getAttribute('href')?.match(/v=([^&]+)/)?.[1] || '';
            const title = entry.querySelector('title')?.textContent || 'Untitled';
            const publishedEl = entry.querySelector('published');
            const published = publishedEl?.textContent
              ? Math.floor(new Date(publishedEl.textContent).getTime() / 1000)
              : null;
            const thumbnail = entry.querySelector('thumbnail')?.getAttribute('url') ||
              entry.querySelectorNS('http://search.yahoo.com/mrss/', 'thumbnail')?.getAttribute('url') ||
              `https://i.ytimg.com/vi/${videoId}/hqdefault.jpg`;

            return {
              videoId,
              title,
              description: '',
              videoThumbnails: [
                { url: `https://i.ytimg.com/vi/${videoId}/maxresdefault.jpg`, quality: 'maxres' },
                { url: `https://i.ytimg.com/vi/${videoId}/sddefault.jpg`, quality: 'high' },
                { url: thumbnail, quality: 'medium' },
              ],
              published,
              lengthSeconds: 0,
              viewCount: 0,
            };
          });
        }
      } catch (e) {
        console.warn(`YouTube RSS direct ${proxy} failed:`, e.message);
      }
    }
  }

  return null;
}

function formatDate(timestamp) {
  if (!timestamp) return '';
  const date = new Date(timestamp * 1000);
  const now = new Date();
  const diff = now - date;
  const days = Math.floor(diff / (1000 * 60 * 60 * 24));

  if (days === 0) return 'Today';
  if (days === 1) return 'Yesterday';
  if (days < 7) return `${days} days ago`;
  if (days < 30) return `${Math.floor(days / 7)} weeks ago`;
  if (days < 365) return `${Math.floor(days / 30)} months ago`;
  return `${Math.floor(days / 365)} years ago`;
}

function formatDuration(seconds) {
  if (!seconds) return '';
  const h = Math.floor(seconds / 3600);
  const m = Math.floor((seconds % 3600) / 60);
  const s = seconds % 60;
  if (h > 0) return `${h}:${m.toString().padStart(2, '0')}:${s.toString().padStart(2, '0')}`;
  return `${m}:${s.toString().padStart(2, '0')}`;
}

function formatViews(views) {
  if (!views) return '';
  if (views >= 1000000) return `${(views / 1000000).toFixed(1)}M views`;
  if (views >= 1000) return `${(views / 1000).toFixed(1)}K views`;
  return `${views} views`;
}

function createFeaturedCard(video) {
  return `
    <a href="https://www.youtube.com/watch?v=${video.videoId}" target="_blank" class="featured-card block group">
      <div class="grid grid-cols-1 md:grid-cols-2 gap-0">
        <div class="thumbnail-wrapper aspect-video md:aspect-auto">
          <img src="${video.videoThumbnails?.find(t => t.quality === 'maxres')?.url || video.videoThumbnails?.[0]?.url || ''}" 
               alt="${video.title}" 
               class="w-full h-full object-cover"
               onerror="this.src='http://static.photos/technology/640x360/1'">
          <div class="play-overlay">
            <div class="w-16 h-16 rounded-full bg-red-600/90 flex items-center justify-center shadow-lg shadow-red-600/30 group-hover:scale-110 transition-transform">
              <svg class="w-7 h-7 text-white ml-1" fill="currentColor" viewBox="0 0 24 24"><path d="M8 5v14l11-7z"/></svg>
            </div>
          </div>
          ${video.lengthSeconds ? `<span class="duration-badge">${formatDuration(video.lengthSeconds)}</span>` : ''}
        </div>
        <div class="p-6 md:p-8 flex flex-col justify-center">
          <div class="flex items-center gap-2 mb-3">
            <span class="px-2.5 py-0.5 rounded-full bg-brand-accent/10 border border-brand-accent/30 text-brand-accent text-xs font-medium">LATEST</span>
            <span class="text-gray-500 text-xs">${formatDate(video.published)}</span>
          </div>
          <h3 class="font-display font-semibold text-lg sm:text-xl md:text-2xl mb-3 text-white group-hover:text-brand-accent transition-colors line-clamp-2">${video.title}</h3>
          <p class="text-gray-500 text-sm line-clamp-2 mb-4">${video.description || 'AI-generated music by Binary Beats.'}</p>
          <div class="flex items-center gap-4 text-xs text-gray-500">
            ${video.viewCount ? `<span class="flex items-center gap-1"><i data-lucide="eye" class="w-3.5 h-3.5"></i> ${formatViews(video.viewCount)}</span>` : ''}
            ${video.lengthSeconds ? `<span class="flex items-center gap-1"><i data-lucide="clock" class="w-3.5 h-3.5"></i> ${formatDuration(video.lengthSeconds)}</span>` : ''}
          </div>
        </div>
      </div>
    </a>
  `;
}

function createVideoCard(video, index) {
  const delay = index * 100;
  return `
    <a href="https://www.youtube.com/watch?v=${video.videoId}" target="_blank" class="video-card block group" style="animation-delay: ${delay}ms">
      <div class="thumbnail-wrapper aspect-video">
        <img src="${video.videoThumbnails?.find(t => t.quality === 'high')?.url || video.videoThumbnails?.[0]?.url || ''}" 
             alt="${video.title}" 
             class="w-full h-full object-cover"
             onerror="this.src='http://static.photos/technology/320x240/${index + 2}'">
        <div class="play-overlay">
          <div class="w-12 h-12 rounded-full bg-red-600/90 flex items-center justify-center shadow-lg group-hover:scale-110 transition-transform">
            <svg class="w-5 h-5 text-white ml-0.5" fill="currentColor" viewBox="0 0 24 24"><path d="M8 5v14l11-7z"/></svg>
          </div>
        </div>
        ${video.lengthSeconds ? `<span class="duration-badge">${formatDuration(video.lengthSeconds)}</span>` : ''}
      </div>
      <div class="p-3 sm:p-4">
        <h3 class="font-semibold text-sm sm:text-base text-gray-200 group-hover:text-brand-accent transition-colors line-clamp-2 mb-2">${video.title}</h3>
        <div class="flex items-center justify-between text-xs text-gray-500">
          <span>${formatDate(video.published)}</span>
          ${video.viewCount ? `<span>${formatViews(video.viewCount)}</span>` : ''}
        </div>
      </div>
    </a>
  `;
}

async function loadVideos() {
  const videos = await fetchChannelVideos();

  if (!videos || videos.length === 0) {
    loadingState.classList.add('hidden');
    errorState.classList.remove('hidden');
    lucide.createIcons();
    return;
  }

  const latestVideos = videos.slice(0, 10);

  // Show featured (latest) video
  featuredVideo.innerHTML = createFeaturedCard(latestVideos[0]);
  featuredVideo.classList.remove('hidden');

  // Show rest in grid
  if (latestVideos.length > 1) {
    videoGridRest.innerHTML = latestVideos.slice(1).map((v, i) => createVideoCard(v, i + 1)).join('');
    videoGridRest.classList.remove('hidden');
  }

  // Update track count
  document.getElementById('trackCount').textContent = `${videos.length}+`;

  // Hide loading, show content
  loadingState.classList.add('hidden');

  // Re-initialize lucide icons for dynamic content
  lucide.createIcons();
}

// Start loading videos
loadVideos();

// ===== Particle Background =====
const particlesCanvas = document.getElementById('particlesCanvas');
const pCtx = particlesCanvas.getContext('2d');
let particles = [];

function resizeParticles() {
  particlesCanvas.width = window.innerWidth;
  particlesCanvas.height = window.innerHeight;
}

class Particle {
  constructor() {
    this.reset();
  }
  reset() {
    this.x = Math.random() * particlesCanvas.width;
    this.y = Math.random() * particlesCanvas.height;
    this.size = Math.random() * 2 + 0.5;
    this.speedX = (Math.random() - 0.5) * 0.3;
    this.speedY = (Math.random() - 0.5) * 0.3;
    this.opacity = Math.random() * 0.5 + 0.1;
    this.color = Math.random() > 0.5 ? '0, 240, 255' : '168, 85, 247';
  }
  update() {
    this.x += this.speedX;
    this.y += this.speedY;
    if (this.x < 0 || this.x > particlesCanvas.width || this.y < 0 || this.y > particlesCanvas.height) {
      this.reset();
    }
  }
  draw() {
    pCtx.beginPath();
    pCtx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
    pCtx.fillStyle = `rgba(${this.color}, ${this.opacity})`;
    pCtx.fill();
  }
}

function initParticles() {
  resizeParticles();
  const count = Math.min(Math.floor((particlesCanvas.width * particlesCanvas.height) / 15000), 80);
  particles = [];
  for (let i = 0; i < count; i++) {
    particles.push(new Particle());
  }
}

function animateParticles() {
  pCtx.clearRect(0, 0, particlesCanvas.width, particlesCanvas.height);
  particles.forEach(p => {
    p.update();
    p.draw();
  });

  // Draw connections
  for (let i = 0; i < particles.length; i++) {
    for (let j = i + 1; j < particles.length; j++) {
      const dx = particles[i].x - particles[j].x;
      const dy = particles[i].y - particles[j].y;
      const dist = Math.sqrt(dx * dx + dy * dy);
      if (dist < 120) {
        pCtx.beginPath();
        pCtx.moveTo(particles[i].x, particles[i].y);
        pCtx.lineTo(particles[j].x, particles[j].y);
        pCtx.strokeStyle = `rgba(0, 240, 255, ${0.05 * (1 - dist / 120)})`;
        pCtx.lineWidth = 0.5;
        pCtx.stroke();
      }
    }
  }

  requestAnimationFrame(animateParticles);
}

window.addEventListener('resize', () => {
  resizeParticles();
  initParticles();
});

initParticles();
animateParticles();

// ===== Audio Visualizer =====
const vizCanvas = document.getElementById('visualizerCanvas');
const vCtx = vizCanvas.getContext('2d');
let mouseX = 0;
let mouseY = 0;
let time = 0;

function resizeVisualizer() {
  const rect = vizCanvas.getBoundingClientRect();
  vizCanvas.width = rect.width * window.devicePixelRatio;
  vizCanvas.height = rect.height * window.devicePixelRatio;
  vCtx.scale(window.devicePixelRatio, window.devicePixelRatio);
}

vizCanvas.addEventListener('mousemove', (e) => {
  const rect = vizCanvas.getBoundingClientRect();
  mouseX = e.clientX - rect.left;
  mouseY = e.clientY - rect.top;
});

vizCanvas.addEventListener('touchmove', (e) => {
  const rect = vizCanvas.getBoundingClientRect();
  mouseX = e.touches[0].clientX - rect.left;
  mouseY = e.touches[0].clientY - rect.top;
});

function drawVisualizer() {
  const w = vizCanvas.width / window.devicePixelRatio;
  const h = vizCanvas.height / window.devicePixelRatio;

  vCtx.clearRect(0, 0, w, h);

  const centerY = h / 2;
  const barCount = 80;
  const barWidth = w / barCount;
  const maxBarHeight = h * 0.8;

  for (let i = 0; i < barCount; i++) {
    const x = i * barWidth;
    const normalizedX = i / barCount;

    // Create wave pattern influenced by mouse
    const distFromMouse = Math.abs(normalizedX - (mouseX / w));
    const mouseInfluence = Math.max(0, 1 - distFromMouse * 3);

    const wave1 = Math.sin(normalizedX * Math.PI * 4 + time * 0.03) * 0.3;
    const wave2 = Math.sin(normalizedX * Math.PI * 8 + time * 0.05) * 0.15;
    const wave3 = Math.cos(normalizedX * Math.PI * 2 + time * 0.02) * 0.2;
    const mouseWave = mouseInfluence * 0.4;

    const barHeight = Math.abs(wave1 + wave2 + wave3 + mouseWave) * maxBarHeight;
    const finalHeight = Math.max(2, barHeight);

    // Gradient for each bar
    const gradient = vCtx.createLinearGradient(x, centerY - finalHeight / 2, x, centerY + finalHeight / 2);
    gradient.addColorStop(0, `rgba(0, 240, 255, ${0.6 + mouseInfluence * 0.4})`);
    gradient.addColorStop(0.5, `rgba(168, 85, 247, ${0.4 + mouseInfluence * 0.4})`);
    gradient.addColorStop(1, `rgba(236, 72, 153, ${0.3 + mouseInfluence * 0.3})`);

    // Top bar (mirror)
    vCtx.fillStyle = gradient;
    vCtx.fillRect(x + 1, centerY - finalHeight / 2, barWidth - 2, finalHeight / 2);

    // Bottom bar (mirror reflection)
    const reflectionGradient = vCtx.createLinearGradient(x, centerY, x, centerY + finalHeight / 2);
    reflectionGradient.addColorStop(0, `rgba(0, 240, 255, ${0.2 + mouseInfluence * 0.2})`);
    reflectionGradient.addColorStop(1, 'rgba(0, 240, 255, 0)');
    vCtx.fillStyle = reflectionGradient;
    vCtx.fillRect(x + 1, centerY, barWidth - 2, finalHeight / 2);

    // Glow dot on top
    if (mouseInfluence > 0.3) {
      vCtx.beginPath();
      vCtx.arc(x + barWidth / 2, centerY - finalHeight / 2, 2 + mouseInfluence * 3, 0, Math.PI * 2);
      vCtx.fillStyle = `rgba(0, 240, 255, ${mouseInfluence * 0.8})`;
      vCtx.fill();
    }
  }

  // Center line
  vCtx.beginPath();
  vCtx.moveTo(0, centerY);
  vCtx.lineTo(w, centerY);
  vCtx.strokeStyle = 'rgba(0, 240, 255, 0.1)';
  vCtx.lineWidth = 1;
  vCtx.stroke();

  time++;
  requestAnimationFrame(drawVisualizer);
}

window.addEventListener('resize', resizeVisualizer);
resizeVisualizer();
drawVisualizer();

// ===== Smooth Scroll for Anchor Links =====
document.querySelectorAll('a[href^="#"]').forEach(anchor => {
  anchor.addEventListener('click', function (e) {
    e.preventDefault();
    const target = document.querySelector(this.getAttribute('href'));
    if (target) {
      target.scrollIntoView({ behavior: 'smooth', block: 'start' });
    }
  });
});