website-cv/script.js

// ── Loader ────────────────────────────────────────────────────
(function () {
  const loader = document.getElementById('loader');
  const pctEl  = document.getElementById('loaderPct');
  let pct = 0;
  const tick = setInterval(() => {
    pct += Math.random() * 20;
    if (pct >= 100) {
      pct = 100;
      clearInterval(tick);
      setTimeout(() => loader.classList.add('hide'), 300);
    }
    pctEl.textContent = Math.floor(pct) + '%';
  }, 110);
})();


// ── Sprinkle background ────────────────────────────
(function () {
  const canvas = document.getElementById('bgCanvas');
  const ctx    = canvas.getContext('2d');

  const COLORS  = ['#e63946', '#f4722b', '#ffbe0b', '#ff006e', '#e07b39', '#ffd166'];
  const COUNT   = 1000;   // number of sprinkles
  const MIN_LEN = 12;    // px
  const MAX_LEN = 18;   // px
  const MIN_W   = 4;
  const MAX_W   = 6;

  let W, H, sprinkles;

  function rand(a, b) { return a + Math.random() * (b - a); }

  function resize() {
    W = canvas.width  = window.innerWidth;
    H = canvas.height = window.innerHeight;
    if (!sprinkles) init();
    // Redistribute any sprinkles that landed outside new bounds
    sprinkles.forEach(s => {
      if (s.x > W) s.x = rand(0, W);
      if (s.y > H) s.y = rand(0, H);
    });
  }

  function init() {
    sprinkles = [];
    for (let i = 0; i < COUNT; i++) {
      sprinkles.push(makeSprinkle());
    }
  }

  function makeSprinkle() {
    return {
      x:      rand(0, W),
      y:      rand(0, H),
      len:    rand(MIN_LEN, MAX_LEN),
      width:  rand(MIN_W, MAX_W),
      color:  COLORS[Math.floor(Math.random() * COLORS.length)],
      angle:  rand(0, Math.PI * 2),
      // very slow drift
      vx:     rand(-0.1, 0.1),
      vy:     rand(-0.1, 0.1),
      va:     rand(-0.005, 0.005),   // angular velocity
      alpha:  1,
    };
  }

  function draw() {
    ctx.clearRect(0, 0, W, H);

    sprinkles.forEach(s => {
      ctx.save();
      ctx.translate(s.x, s.y);
      ctx.rotate(s.angle);
      ctx.beginPath();
      ctx.moveTo(0, -s.len / 2);
      ctx.lineTo(0,  s.len / 2);
      ctx.strokeStyle = s.color;
      ctx.lineWidth   = s.width;
      ctx.lineCap     = 'round';
      ctx.globalAlpha = s.alpha;
      ctx.stroke();
      ctx.restore();

      // Drift
      s.x     += s.vx;
      s.y     += s.vy;
      if (s.vx > 0.1 || s.vx < -0.1) {
        s.vx *= 0.98;
      }
      if (s.vy > 0.1 || s.vy < -0.1) {
        s.vy *= 0.98;
      }
      s.angle += s.va;

      // Repel from cursor
      const dx = s.x - mouseX;
      const dy = s.y - mouseY;
      const dist = Math.sqrt(dx * dx + dy * dy);
      const repelRadius = 80;
      if (dist < repelRadius && dist > 0) {
        const force = (repelRadius - dist) / repelRadius;
        s.vx += (dx / dist) * force * 1.0;
        s.vy += (dy / dist) * force * 1.0;
      }

      // Wrap: when a sprinkle drifts off the screen, reappear on the other side
      if (s.y < -MAX_LEN) s.y = H + MAX_LEN;
      if (s.y > H + MAX_LEN) s.y = -MAX_LEN
      if (s.x < -MAX_LEN)  s.x = W + MAX_LEN;
      if (s.x > W + MAX_LEN) s.x = -MAX_LEN;
    });

    requestAnimationFrame(draw);
  }

  window.addEventListener('resize', resize, { passive: true });
  resize();
  let mouseX = -9999, mouseY = -9999;
  window.addEventListener('mousemove', (e) => {
    mouseX = e.clientX;
    mouseY = e.clientY;
  }, { passive: true });
  requestAnimationFrame(draw);
})();


// ── Nav: scroll state & active link ───────────────────────────
(function () {
  const header   = document.getElementById('header');
  const links    = document.querySelectorAll('.nav-link');
  const sections = document.querySelectorAll('section[id]');

  window.addEventListener('scroll', () => {
    header.classList.toggle('scrolled', window.scrollY > 24);

    let current = '';
    sections.forEach(s => {
      if (window.scrollY >= s.offsetTop - 100) current = s.id;
    });
    links.forEach(l => {
      l.classList.toggle('active', l.getAttribute('href') === '#' + current);
    });
  }, { passive: true });
})();


// ── Mobile burger ──────────────────────────────────────────────
(function () {
  const burger   = document.getElementById('burger');
  const navLinks = document.getElementById('navLinks');
  burger.addEventListener('click', () => {
    burger.classList.toggle('open');
    navLinks.classList.toggle('open');
  });
  navLinks.querySelectorAll('a').forEach(a => {
    a.addEventListener('click', () => {
      burger.classList.remove('open');
      navLinks.classList.remove('open');
    });
  });
})();


// ── Scroll fade-in ─────────────────────────────────────────────
(function () {
  const targets = document.querySelectorAll(
    '.section-header, .about-grid, .skill-card, .timeline-item, ' +
    '.project-card, .edu-card, .hero-content, .hero-visual'
  );
  targets.forEach(el => el.classList.add('fade-up'));

  const observer = new IntersectionObserver((entries) => {
    entries.forEach(e => {
      if (!e.isIntersecting) return;
      const siblings = [...e.target.parentElement.querySelectorAll('.fade-up')];
      const idx = siblings.indexOf(e.target);
      setTimeout(() => e.target.classList.add('visible'), idx * 80);
      observer.unobserve(e.target);
    });
  }, { threshold: 0.1 });

  targets.forEach(el => observer.observe(el));
})();