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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Saswat S. Patra - Portfolio</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    }

    body {
      background: linear-gradient(135deg, #1a1a22 0%, #22222b 100%);
      color: #e0e0e0;
      line-height: 1.6;
      overflow-x: hidden;
      position: relative;
      transition: background 0.3s;
    }

    body.light-theme {
      background: linear-gradient(135deg, #f5f7fa 0%, #e4e9fd 100%);
      color: #333;
    }

    /* Polka Dots Background */
    .polka-dots {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: -1;
    }

    .dot {
      position: absolute;
      background: rgba(74, 144, 226, 0.3);
      border-radius: 50%;
      animation: twinkle 5s infinite ease-in-out;
      will-change: opacity, transform;
    }

    .dot:nth-child(odd) {
      animation-delay: 1s;
    }

    .dot:nth-child(even) {
      animation-delay: 2s;
    }

    /* Randomly position and size dots */
    .dot:nth-child(1) { top: 10%; left: 15%; width: 8px; height: 8px; }
    .dot:nth-child(2) { top: 20%; left: 80%; width: 6px; height: 6px; }
    .dot:nth-child(3) { top: 30%; left: 25%; width: 10px; height: 10px; }
    .dot:nth-child(4) { top: 40%; left: 60%; width: 7px; height: 7px; }
    .dot:nth-child(5) { top: 50%; left: 10%; width: 9px; height: 9px; }
    .dot:nth-child(6) { top: 60%; left: 70%; width: 5px; height: 5px; }
    .dot:nth-child(7) { top: 70%; left: 30%; width: 8px; height: 8px; }
    .dot:nth-child(8) { top: 80%; left: 50%; width: 6px; height: 6px; }
    .dot:nth-child(9) { top: 90%; left: 20%; width: 7px; height: 7px; }
    .dot:nth-child(10) { top: 15%; left: 90%; width: 9px; height: 9px; }

    @keyframes twinkle {
      0%, 100% { opacity: 0.3; transform: scale(1) translate(0, 0); }
      50% { opacity: 0.7; transform: scale(1.2) translate(5px, 5px); }
    }

    /* Loading Animation */
    .loader {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(26, 26, 34, 0.9);
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 2000;
      opacity: 1;
      transition: opacity 0.5s ease-out;
    }

    .loader.hidden {
      opacity: 0;
      pointer-events: none;
    }

    .cube-container {
      perspective: 800px;
      width: 80px;
      height: 80px;
    }

    .cube {
      position: relative;
      width: 100%;
      height: 100%;
      transform-style: preserve-3d;
      animation: spin 4s linear infinite, pulse 2s ease-in-out infinite;
      will-change: transform;
    }

    .cube-face {
      position: absolute;
      width: 80px;
      height: 80px;
      background: rgba(30, 30, 38, 0.85);
      backdrop-filter: blur(5px);
      border: 1px solid rgba(74, 144, 226, 0.4);
      box-shadow: 0 0 10px rgba(74, 144, 226, 0.3);
    }

    .cube-face.front  { transform: rotateY(0deg) translateZ(40px); }
    .cube-face.back   { transform: rotateY(180deg) translateZ(40px); }
    .cube-face.right  { transform: rotateY(90deg) translateZ(40px); }
    .cube-face.left   { transform: rotateY(-90deg) translateZ(40px); }
    .cube-face.top    { transform: rotateX(90deg) translateZ(40px); }
    .cube-face.bottom { transform: rotateX(-90deg) translateZ(40px); }

    @keyframes spin {
      0% { transform: rotateX(0deg) rotateY(0deg); }
      100% { transform: rotateX(360deg) rotateY(360deg); }
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); box-shadow: 0 0 10px rgba(74, 144, 226, 0.3); }
      50% { transform: scale(1.1); box-shadow: 0 0 20px rgba(74, 144, 226, 0.6); }
    }

    /* Scroll Progress Bar */
    .progress-bar {
      position: fixed;
      top: 0;
      left: 0;
      height: 4px;
      background: #4a90e2;
      width: 0;
      z-index: 1000;
      transition: width 0.2s ease;
    }

    /* Theme Toggle */
    .theme-toggle {
      position: fixed;
      top: 20px;
      right: 20px;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: #e0e0e0;
      cursor: pointer;
      z-index: 1000;
      transition: color 0.3s;
    }

    .light-theme .theme-toggle {
      color: #333;
    }

    .container {
      max-width: 1200px;
      margin: 20px auto;
      padding: 20px;
      background: rgba(26, 26, 34, 0.7);
      border: 1px solid rgba(74, 144, 226, 0.2);
      border-radius: 15px;
      opacity: 0;
      transition: opacity 0.5s ease-in;
    }

    .light-theme .container {
      background: rgba(255, 255, 255, 0.7);
      border: 1px solid rgba(53, 122, 189, 0.2);
    }

    .container.loaded {
      opacity: 1;
    }

    .bento-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }

    .bento-item {
      background: rgba(30, 30, 38, 0.85);
      border: 1px solid rgba(74, 144, 226, 0.3);
      border-radius: 15px;
      padding: 20px;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
      transition: transform 0.4s ease, box-shadow 0.4s ease;
      position: relative;
      opacity: 0;
      transform: translateY(50px);
      will-change: transform, opacity;
    }

    .light-theme .bento-item {
      background: rgba(255, 255, 255, 0.8);
      border: 1px solid rgba(53, 122, 189, 0.3);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    }

    .bento-item::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(
        135deg,
        rgba(74, 144, 226, 0.1) 0%,
        transparent 50%,
        rgba(74, 144, 226, 0.1) 100%
      );
      opacity: 0.5;
      z-index: 0;
    }

    .bento-item.reveal {
      opacity: 1;
      transform: translateY(0);
    }

    .bento-item:hover {
      transform: translateY(-10px) scale(1.02);
      box-shadow: 0 12px 30px rgba(74, 144, 226, 0.5);
    }

    .light-theme .bento-item:hover {
      box-shadow: 0 12px 30px rgba(53, 122, 189, 0.5);
    }

    .bento-item h2 {
      margin-bottom: 15px;
      font-size: 1.8rem;
      position: relative;
      z-index: 1;
      color: #4a90e2;
      text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    }

    .light-theme .bento-item h2 {
      color: #357abd;
      text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    }

    .bento-item p, .bento-item ul {
      margin-bottom: 15px;
      position: relative;
      z-index: 1;
      color: #f0f0f0;
    }

    .light-theme .bento-item p, .light-theme .bento-item ul {
      color: #333;
    }

    .bento-item ul {
      list-style: none;
    }

    .bento-item ul li {
      margin-bottom: 10px;
      padding-left: 25px;
      position: relative;
      transition: transform 0.3s, color 0.3s;
    }

    .bento-item ul li:hover {
      transform: translateX(10px);
      color: #4a90e2;
    }

    .light-theme .bento-item ul li:hover {
      color: #357abd;
    }

    .bento-item ul li::before {
      content: '→';
      position: absolute;
      left: 0;
      color: #4a90e2;
      font-size: 1.2em;
    }

    .light-theme .bento-item ul li::before {
      color: #357abd;
    }

    /* Project Cards */
    .project-card {
      background: rgba(255, 255, 255, 0.05);
      border-radius: 10px;
      padding: 10px;
      margin-bottom: 10px;
      cursor: pointer;
      transition: background 0.3s;
    }

    .light-theme .project-card {
      background: rgba(0, 0, 0, 0.05);
    }

    .project-card:hover {
      background: rgba(74, 144, 226, 0.3);
    }

    /* Modal */
    .modal {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.8);
      z-index: 1500;
      justify-content: center;
      align-items: center;
    }

    .modal-content {
      background: rgba(28, 28, 36, 0.8);
      border: 1px solid rgba(74, 144, 226, 0.2);
      border-radius: 15px;
      padding: 20px;
      max-width: 500px;
      width: 90%;
      position: relative;
      animation: slideIn 0.3s ease-out;
    }

    .light-theme .modal-content {
      background: rgba(255, 255, 255, 0.8);
      border: 1px solid rgba(53, 122, 189, 0.2);
    }

    .modal-content h3 {
      color: #4a90e2;
      margin-bottom: 15px;
    }

    .light-theme .modal-content h3 {
      color: #357abd;
    }

    .modal-content p {
      color: #f0f0f0;
      margin-bottom: 15px;
    }

    .light-theme .modal-content p {
      color: #333;
    }

    .close-modal {
      position: absolute;
      top: 10px;
      right: 15px;
      font-size: 1.5rem;
      color: #f0f0f0;
      cursor: pointer;
      transition: color 0.3s;
    }

    .light-theme .close-modal {
      color: #333;
    }

    .close-modal:hover {
      color: #4a90e2;
    }

    .light-theme .close-modal:hover {
      color: #357abd;
    }

    @keyframes slideIn {
      from { transform: translateY(-50px); opacity: 0; }
      to { transform: translateY(0); opacity: 1; }
    }

    /* Skill Progress Bars */
    .skill {
      margin-bottom: 15px;
    }

    .skill-name {
      margin-bottom: 5px;
      color: #f0f0f0;
    }

    .light-theme .skill-name {
      color: #333;
    }

    .skill-bar {
      background: rgba(255, 255, 255, 0.1);
      border-radius: 5px;
      height: 10px;
      overflow: hidden;
    }

    .light-theme .skill-bar {
      background: rgba(0, 0, 0, 0.1);
    }

    .skill-progress {
      background: #4a90e2;
      height: 100%;
      width: 0;
      transition: width 1s ease-in-out;
    }

    .light-theme .skill-progress {
      background: #357abd;
    }

    .large {
      grid-column: span 2;
    }

    .medium {
      grid-column: span 1;
    }

    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 15px;
      position: relative;
      z-index: 1;
    }

    .contact-form input, .contact-form textarea {
      padding: 12px;
      border: 1px solid rgba(74, 144, 226, 0.3);
      border-radius: 8px;
      background: rgba(255, 255, 255, 0.05);
      color: #f0f0f0;
      font-size: 1rem;
      transition: border-color 0.3s, box-shadow 0.3s;
    }

    .light-theme .contact-form input, .light-theme .contact-form textarea {
      background: rgba(0, 0, 0, 0.05);
      color: #333;
      border: 1px solid rgba(53, 122, 189, 0.3);
    }

    .contact-form input:focus, .contact-form textarea:focus {
      outline: none;
      border-color: #4a90e2;
      box-shadow: 0 0 8px rgba(74, 144, 226, 0.5);
    }

    .light-theme .contact-form input:focus, .light-theme .contact-form textarea:focus {
      border-color: #357abd;
      box-shadow: 0 0 8px rgba(53, 122, 189, 0.5);
    }

    .contact-form button {
      background: linear-gradient(90deg, #4a90e2, #357abd);
      color: #fff;
      border: none;
      padding: 12px;
      border-radius: 8px;
      cursor: pointer;
      font-weight: 600;
      transition: transform 0.3s, box-shadow 0.3s;
    }

    .contact-form button:hover {
      transform: scale(1.05);
      box-shadow: 0 5px 15px rgba(74, 144, 226, 0.4);
    }

    /* Social Links */
    .social-links {
      text-align: center;
      margin-top: 40px;
    }

    .social-links a {
      display: inline-block;
      margin: 0 15px;
      font-size: 1rem;
      color: #f0f0f0;
      text-decoration: none;
      transition: color 0.3s, transform 0.3s;
    }

    .social-links a:hover {
      color: #4a90e2;
      transform: scale(1.1);
    }

    .light-theme .social-links a {
      color: #333;
    }

    .light-theme .social-links a:hover {
      color: #357abd;
    }

    /* Performance Optimizations for Low-End Devices */
    @media (prefers-reduced-motion: reduce) or (max-width: 600px) {
      .cube-face {
        backdrop-filter: none;
        background: rgba(30, 30, 38, 0.9);
      }

      .bento-item {
        backdrop-filter: none;
        background: rgba(30, 30, 38, 0.9);
      }

      .container {
        backdrop-filter: none;
        background: rgba(26, 26, 34, 0.8);
      }

      .modal-content {
        backdrop-filter: none;
        background: rgba(28, 28, 36, 0.9);
      }

      .bento-item:hover {
        transform: translateY(-5px);
        box-shadow: 0 6px 15px rgba(74, 144, 226, 0.3);
      }

      .bento-item::after {
        display: none;
      }

      .cube {
        animation: spin 6s linear infinite;
      }

      .skill-progress {
        transition: none;
      }

      .dot {
        animation: none;
        opacity: 0.3;
      }
    }

    @media (max-width: 768px) {
      .bento-grid {
        grid-template-columns: 1fr;
      }

      .large, .medium {
        grid-column: span 1;
      }
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(50px); }
      to { opacity: 1; transform: translateY(0); }
    }
  </style>
</head>
<body>
  <div class="polka-dots">
    <div class="dot"></div>
    <div class="dot"></div>
    <div class="dot"></div>
    <div class="dot"></div>
    <div class="dot"></div>
    <div class="dot"></div>
    <div class="dot"></div>
    <div class="dot"></div>
    <div class="dot"></div>
    <div class="dot"></div>
  </div>

  <div class="loader">
    <div class="cube-container">
      <div class="cube">
        <div class="cube-face front"></div>
        <div class="cube-face back"></div>
        <div class="cube-face right"></div>
        <div class="cube-face left"></div>
        <div class="cube-face top"></div>
        <div class="cube-face bottom"></div>
      </div>
    </div>
  </div>

  <div class="progress-bar"></div>
  <button class="theme-toggle" onclick="toggleTheme()">?</button>

  <div class="container">
    <div class="bento-grid">
      <div class="bento-item large" id="about">
        <h2>About Me</h2>
        <p>
          I'm Saswat S. Patra, a creative web developer obsessed with crafting immersive digital experiences. 
          My expertise lies in front-end technologies, and I thrive on pushing the boundaries of modern web design.
        </p>
      </div>

      <div class="bento-item medium" id="projects">
        <h2>Projects</h2>
        <div class="project-card" onclick="openModal('portfolio')">
          <strong>Interactive Portfolio</strong>: A dynamic portfolio with animated Bento grid layout.
        </div>
        <div class="project-card" onclick="openModal('ecommerce')">
          <strong>E-commerce Dashboard</strong>: A sleek, responsive dashboard for online stores.
        </div>
        <div class="project-card" onclick="openModal('chat')">
          <strong>Real-Time Chat App</strong>: A modern chat application with WebSocket integration.
        </div>
      </div>

      <div class="bento-item medium" id="skills">
        <h2>Skills</h2>
        <div class="skill">
          <div class="skill-name">HTML5, CSS3, JavaScript</div>
          <div class="skill-bar">
            <div class="skill-progress" style="width: 90%"></div>
          </div>
        </div>
        <div class="skill">
          <div class="skill-name">React & TypeScript</div>
          <div class="skill-bar">
            <div class="skill-progress" style="width: 85%"></div>
          </div>
        </div>
        <div class="skill">
          <div class="skill-name">Web Animations & GSAP</div>
          <div class="skill-bar">
            <div class="skill-progress" style="width: 75%"></div>
          </div>
        </div>
        <div class="skill">
          <div class="skill-name">Node.js & REST APIs</div>
          <div class="skill-bar">
            <div class="skill-progress" style="width: 80%"></div>
          </div>
        </div>
      </div>

      <div class="bento-item large" id="contact">
        <h2>Contact Me</h2>
        <div class="contact-form">
          <input type="text" placeholder="Your Name" required>
          <input type="email" placeholder="Your Email" required>
          <textarea placeholder="Your Message" rows="4" required></textarea>
          <button type="button" onclick="handleSubmit()">Send Message</button>
        </div>
      </div>
    </div>

    <div class="social-links">
      <a href="https://github.com" target="_blank">GitHub</a>
      <a href="https://linkedin.com" target="_blank">LinkedIn</a>
      <a href="https://twitter.com" target="_blank">Twitter</a>
    </div>
  </div>

  <!-- Modal -->
  <div class="modal" id="project-modal">
    <div class="modal-content">
      <span class="close-modal" onclick="closeModal()">×</span>
      <div id="modal-body"></div>
    </div>
  </div>

  <script>
    function handleSubmit() {
      alert('Message sent! (Demo - no backend connected)');
      document.querySelector('.contact-form').reset();
    }

    function toggleTheme() {
      document.body.classList.toggle('light-theme');
      const toggleButton = document.querySelector('.theme-toggle');
      toggleButton.textContent = document.body.classList.contains('light-theme') ? '?' : '☀️';
    }

    function openModal(project) {
      const modal = document.getElementById('project-modal');
      const modalBody = document.getElementById('modal-body');
      let content = '';

      switch (project) {
        case 'portfolio':
          content = `
            <h3>Interactive Portfolio</h3>
            <p>A dynamic portfolio showcasing my skills with a modern Bento grid layout. Features smooth animations and responsive design.</p>
            <p><strong>Technologies:</strong> HTML, CSS, JavaScript</p>
          `;
          break;
        case 'ecommerce':
          content = `
            <h3>E-commerce Dashboard</h3>
            <p>A responsive dashboard for managing online stores, with real-time analytics and user-friendly interface.</p>
            <p><strong>Technologies:</strong> React, Node.js, MongoDB</p>
          `;
          break;
        case 'chat':
          content = `
            <h3>Real-Time Chat App</h3>
            <p>A modern chat application with WebSocket integration for seamless real-time communication.</p>
            <p><strong>Technologies:</strong> Node.js, Socket.io, Express</p>
          `;
          break;
      }

      modalBody.innerHTML = content;
      modal.style.display = 'flex';
    }

    function closeModal() {
      document.getElementById('project-modal').style.display = 'none';
    }

    const observer = new IntersectionObserver((entries) => {
      entries.forEach(entry => {
        if (entry.isIntersecting) {
          entry.target.classList.add('reveal');
          entry.target.style.animation = 'fadeIn 0.6s ease-out forwards';
          if (entry.target.id === 'skills') {
            document.querySelectorAll('.skill-progress').forEach(bar => {
              bar.style.width = bar.getAttribute('style').split(':')[1];
            });
          }
        }
      });
    }, { threshold: 0.2 });

    document.querySelectorAll('.bento-item').forEach(item => {
      observer.observe(item);
    });

    // Scroll Progress Bar
    window.addEventListener('scroll', () => {
      const scrollTop = document.documentElement.scrollTop;
      const scrollHeight = document.documentElement.scrollHeight - document.documentElement.clientHeight;
      const scrollPercent = (scrollTop / scrollHeight) * 100;
      document.querySelector('.progress-bar').style.width = scrollPercent + '%';
    });

    // Loading Animation
    window.addEventListener('load', () => {
      setTimeout(() => {
        document.querySelector('.loader').classList.add('hidden');
        document.querySelector('.container').classList.add('loaded');
      }, 1500);
    });

    // Performance Optimization: Detect Low-End Devices
    if (navigator.hardwareConcurrency && navigator.hardwareConcurrency <= 2) {
      document.body.classList.add('low-end');
    }
  </script>
</body>
</html>