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18 December 2025

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HTML

<!DOCTYPE html>
<html lang="en" data-theme="dark">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Alex Rivera | Senior Full-Stack Engineer & Designer</title>
  <meta name="description" content="Portfolio of Alex Rivera — Senior Full-Stack Engineer specializing in scalable web applications, modern UI/UX design, and cloud architecture.">
  <link rel="preconnect" href="https://fonts.googleapis.com">
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  <link href="https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap" rel="stylesheet">
  <link rel="stylesheet" href="styles.css">
</head>
<body>
  
  <div class="bg-glow bg-glow-1" aria-hidden="true"></div>
  <div class="bg-glow bg-glow-2" aria-hidden="true"></div>

<header class="header" id="header">
    <div class="container header-container">
      <a href="#hero" class="logo">
        <span class="logo-bracket"><</span>
        <span class="logo-name">AlexRivera</span>
        <span class="logo-bracket">/></span>
      </a>

<nav class="nav-menu" id="nav-menu" aria-label="Main Navigation">
        <ul class="nav-list">
          <li class="nav-item"><a href="#hero" class="nav-link active">Home</a></li>
          <li class="nav-item"><a href="#about" class="nav-link">About</a></li>
          <li class="nav-item"><a href="#skills" class="nav-link">Skills</a></li>
          <li class="nav-item"><a href="#projects" class="nav-link">Projects</a></li>
          <li class="nav-item"><a href="#experience" class="nav-link">Experience</a></li>
          <li class="nav-item"><a href="#contact" class="nav-link">Contact</a></li>
        </ul>
      </nav>

<a href="#contact" class="btn btn-sm btn-primary header-cta">Hire Me</a>

<button class="mobile-toggle" id="mobile-toggle" aria-label="Open mobile menu" aria-expanded="false">
          <span class="bar"></span>
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        </button>
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<div class="mobile-drawer" id="mobile-drawer" aria-hidden="true">
    <div class="mobile-drawer-content">
      <ul class="mobile-nav-list">
        <li><a href="#hero" class="mobile-nav-link">Home</a></li>
        <li><a href="#about" class="mobile-nav-link">About</a></li>
        <li><a href="#skills" class="mobile-nav-link">Skills</a></li>
        <li><a href="#projects" class="mobile-nav-link">Projects</a></li>
        <li><a href="#experience" class="mobile-nav-link">Experience</a></li>
        <li><a href="#contact" class="mobile-nav-link">Contact</a></li>
      </ul>
      <div class="mobile-drawer-footer">
        <a href="#contact" class="btn btn-primary w-full">Let's Talk</a>
      </div>
    </div>
  </div>

<main>
    
    <section class="section hero-section" id="hero">
      <div class="container hero-container">
        <div class="hero-content">
          <div class="status-badge">
            <span class="pulse-dot"></span>
            <span>Available for new opportunities</span>
          </div>

<h1 class="hero-title">
            Crafting resilient code & <span class="gradient-text">exceptional digital experiences</span>.
          </h1>

<p class="hero-subtitle">
            Hi, I'm <strong>Alex Rivera</strong> — a Senior Full-Stack Engineer and Product Architect with 6+ years of experience transforming complex engineering challenges into elegant, high-performance web products.
          </p>

<div class="hero-buttons">
            <a href="#projects" class="btn btn-primary btn-lg">
              <span>Explore My Work</span>
              <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
                <line x1="5" y1="12" x2="19" y2="12"></line>
                <polyline points="12 5 19 12 12 19"></polyline>
              </svg>
            </a>
            <a href="#contact" class="btn btn-outline btn-lg">
              <span>Get in Touch</span>
            </a>
          </div>

<div class="hero-socials">
            <span class="social-label">Connect:</span>
            <div class="social-links">
              <a href="https://github.com" target="_blank" rel="noopener noreferrer" class="social-icon" aria-label="GitHub">
                <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M9 19c-5 1.5-5-2.5-7-3m14 6v-3.87a3.37 3.37 0 0 0-.94-2.61c3.14-.35 6.44-1.54 6.44-7A5.44 5.44 0 0 0 20 4.77 5.07 5.07 0 0 0 19.91 1S18.73.65 16 2.48a13.38 13.38 0 0 0-7 0C6.27.65 5.09 1 5.09 1A5.07 5.07 0 0 0 5 4.77a5.44 5.44 0 0 0-1.5 3.78c0 5.42 3.3 6.61 6.44 7A3.37 3.37 0 0 0 9 18.13V22"></path></svg>
              </a>
              <a href="https://linkedin.com" target="_blank" rel="noopener noreferrer" class="social-icon" aria-label="LinkedIn">
                <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M16 8a6 6 0 0 1 6 6v7h-4v-7a2 2 0 0 0-2-2 2 2 0 0 0-2 2v7h-4v-7a6 6 0 0 1 6-6z"></path><rect x="2" y="9" width="4" height="12"></rect><circle cx="4" cy="4" r="2"></circle></svg>
              </a>
              <a href="https://twitter.com" target="_blank" rel="noopener noreferrer" class="social-icon" aria-label="X (Twitter)">
                <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M22 4s-.7 2.1-2 3.4c1.6 10-9.4 17.3-18 11.6 2.2.1 4.4-.6 6-2C3 15.5.5 9.6 3 5c2.2 2.6 5.6 4.1 9 4-.9-4.2 4-6.6 7-3.8 1.1 0 3-1.2 3-1.2z"></path></svg>
              </a>
            </div>
          </div>
        </div>

<div class="hero-visual">
          <div class="code-card-wrapper">
            <div class="code-card">
              <div class="card-header">
                <span class="card-dot dot-red"></span>
                <span class="card-dot dot-yellow"></span>
                <span class="card-dot dot-green"></span>
                <span class="card-title">developer.config.ts</span>
              </div>
              <div class="card-body">
                <pre><code><span class="token-keyword">const</span> <span class="token-variable">developer</span> = {
  <span class="token-property">name</span>: <span class="token-string">'Alex Rivera'</span>,
  <span class="token-property">role</span>: <span class="token-string">'Full-Stack Engineer'</span>,
  <span class="token-property">passions</span>: [
    <span class="token-string">'Distributed Systems'</span>,
    <span class="token-string">'Interactive UI'</span>,
    <span class="token-string">'Open Source'</span>
  ],
  <span class="token-property">coreStack</span>: {
    <span class="token-property">frontend</span>: [<span class="token-string">'TypeScript'</span>, <span class="token-string">'React'</span>, <span class="token-string">'Next.js'</span>],
    <span class="token-property">backend</span>: [<span class="token-string">'Node'</span>, <span class="token-string">'Python'</span>, <span class="token-string">'PostgreSQL'</span>],
    <span class="token-property">devOps</span>: [<span class="token-string">'Docker'</span>, <span class="token-string">'AWS'</span>, <span class="token-string">'CI/CD'</span>]
  },
  <span class="token-property">currentlyBuilding</span>: <span class="token-string">'Next-gen AI workflows'</span>
};</code></pre>
              </div>
            </div>
            
            <div class="floating-badge badge-top">
              <div class="badge-icon"></div>
              <div class="badge-text">
                <span class="badge-title">Ultra Fast</span>
                <span class="badge-subtitle">100/100 Lighthouse</span>
              </div>
            </div>
            
            <div class="floating-badge badge-bottom">
              <div class="badge-icon"></div>
              <div class="badge-text">
                <span class="badge-title">6+ Years</span>
                <span class="badge-subtitle">Shipping Products</span>
              </div>
            </div>
          </div>
        </div>
      </div>
    </section>

<section class="section stats-section">
      <div class="container">
        <div class="stats-grid">
          <div class="stat-card">
            <h3 class="stat-number">6+</h3>
            <p class="stat-label">Years of Experience</p>
          </div>
          <div class="stat-card">
            <h3 class="stat-number">45+</h3>
            <p class="stat-label">Completed Projects</p>
          </div>
          <div class="stat-card">
            <h3 class="stat-number">20+</h3>
            <p class="stat-label">Global Clients</p>
          </div>
          <div class="stat-card">
            <h3 class="stat-number">99.9%</h3>
            <p class="stat-label">Code Quality & Uptime</p>
          </div>
        </div>
      </div>
    </section>

<section class="section" id="about">
      <div class="container">
        <div class="section-header">
          <p class="section-tag">About Me</p>
          <h2 class="section-title">Bridging technical precision with user-centric design</h2>
        </div>

<div class="about-grid">
          <div class="about-image-card">
            <div class="about-avatar-wrapper">
              <div class="avatar-placeholder">
                <svg xmlns="http://www.w3.org/2000/svg" width="80" height="80" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
                  <path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"></path>
                  <circle cx="12" cy="7" r="4"></circle>
                </svg>
              </div>
              <div class="avatar-tag">Senior Engineer</div>
            </div>
          </div>

<div class="about-text-content">
            <h3 class="about-heading">I love building tools that empower people and simplify workflows.</h3>
            <p class="text-body">
              Over the past 6 years, I've worked across high-growth startups, product agencies, and open-source ecosystems. My work sits at the intersection of robust backend infrastructure and pixel-perfect interactive frontends.
            </p>
            <p class="text-body">
              Whether architecting distributed microservices, fine-tuning state management, or designing intuitive micro-animations, I prioritize performance, maintainability, and accessibility at every layer.
            </p>

<div class="about-highlights">
              <div class="highlight-item">
                <span class="highlight-icon">✓</span>
                <div>
                  <strong>Architecture-First Mindset:</strong> Designing systems built for horizontal scale and high reliability.
                </div>
              </div>
              <div class="highlight-item">
                <span class="highlight-icon">✓</span>
                <div>
                  <strong>Obsession with Performance:</strong> Shaving milliseconds off load times and optimizing core web vitals.
                </div>
              </div>
              <div class="highlight-item">
                <span class="highlight-icon">✓</span>
                <div>
                  <strong>Collaborative Leadership:</strong> Mentoring teammates, facilitating design sprints, and driving team standards.
                </div>
              </div>
            </div>

<div class="about-actions">
              <a href="#contact" class="btn btn-primary">Work With Me</a>
              <a href="#projects" class="btn btn-outline">Browse Portfolio</a>
            </div>
          </div>
        </div>
      </div>
    </section>

<section class="section" id="skills">
      <div class="container">
        <div class="section-header">
          <p class="section-tag">Tech Stack</p>
          <h2 class="section-title">Tools & Technologies I work with daily</h2>
        </div>

<div class="skills-grid">
          
          <div class="skill-category-card">
            <div class="category-header">
              <div class="category-icon icon-blue">
                <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="12 2 2 7 12 12 22 7 12 2"></polygon><polyline points="2 17 12 22 22 17"></polyline><polyline points="2 12 12 17 22 12"></polyline></svg>
              </div>
              <h3 class="category-title">Frontend Engineering</h3>
            </div>
            <p class="category-desc">Crafting responsive, accessible, and reactive user interfaces.</p>
            <div class="skill-tags">
              <span class="skill-tag">TypeScript</span>
              <span class="skill-tag">React.js</span>
              <span class="skill-tag">Next.js (App Router)</span>
              <span class="skill-tag">Vue.js / Nuxt</span>
              <span class="skill-tag">HTML5 / Semantic</span>
              <span class="skill-tag">Modern CSS3 / SCSS</span>
              <span class="skill-tag">Tailwind CSS</span>
              <span class="skill-tag">WebSockets / WebRTC</span>
            </div>
          </div>

<div class="skill-category-card">
            <div class="category-header">
              <div class="category-icon icon-purple">
                <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="2" width="20" height="8" rx="2" ry="2"></rect><rect x="2" y="14" width="20" height="8" rx="2" ry="2"></rect><line x1="6" y1="6" x2="6.01" y2="6"></line><line x1="6" y1="18" x2="6.01" y2="18"></line></svg>
              </div>
              <h3 class="category-title">Backend & APIs</h3>
            </div>
            <p class="category-desc">Building resilient APIs, microservices, and databases.</p>
            <div class="skill-tags">
              <span class="skill-tag">Node.js / Express</span>
              <span class="skill-tag">Python / FastAPI</span>
              <span class="skill-tag">PostgreSQL</span>
              <span class="skill-tag">Redis (Caching/Queues)</span>
              <span class="skill-tag">GraphQL & REST</span>
              <span class="skill-tag">Prisma / TypeORM</span>
              <span class="skill-tag">MongoDB</span>
              <span class="skill-tag">Kafka / Event-Driven</span>
            </div>
          </div>

<div class="skill-category-card">
            <div class="category-header">
              <div class="category-icon icon-cyan">
                <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M18 10h-1.26A8 8 0 1 0 9 20h9a5 5 0 0 0 0-10z"></path></svg>
              </div>
              <h3 class="category-title">Cloud & Infrastructure</h3>
            </div>
            <p class="category-desc">Automating deployments and managing cloud workloads.</p>
            <div class="skill-tags">
              <span class="skill-tag">Docker</span>
              <span class="skill-tag">Kubernetes</span>
              <span class="skill-tag">AWS (EC2, S3, Lambda)</span>
              <span class="skill-tag">GitHub Actions CI/CD</span>
              <span class="skill-tag">Terraform</span>
              <span class="skill-tag">Vercel & Cloudflare</span>
              <span class="skill-tag">Prometheus & Grafana</span>
            </div>
          </div>

<div class="skill-category-card">
            <div class="category-header">
              <div class="category-icon icon-emerald">
                <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="3"></circle><path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z"></path></svg>
              </div>
              <h3 class="category-title">Design & Tooling</h3>
            </div>
            <p class="category-desc">Designing workflows that ensure high developer velocity.</p>
            <div class="skill-tags">
              <span class="skill-tag">Figma / UI Design</span>
              <span class="skill-tag">Git / Trunk-based</span>
              <span class="skill-tag">Jest / Playwright</span>
              <span class="skill-tag">Postman</span>
              <span class="skill-tag">Agile / Scrum</span>
              <span class="skill-tag">Design Systems</span>
            </div>
          </div>
        </div>
      </div>
    </section>

<section class="section" id="projects">
      <div class="container">
        <div class="section-header">
          <p class="section-tag">Featured Work</p>
          <h2 class="section-title">Selected projects that showcase my craft</h2>
        </div>

<div class="project-filters" role="tablist" aria-label="Project Categories">
          <button class="filter-btn active" data-filter="all">All Projects</button>
          <button class="filter-btn" data-filter="fullstack">Full-Stack</button>
          <button class="filter-btn" data-filter="frontend">Frontend & UI</button>
          <button class="filter-btn" data-filter="cloud">Cloud / Systems</button>
        </div>

<div class="projects-grid" id="projects-grid">
          
          <article class="project-card" data-category="fullstack">
            <div class="project-media gradient-preview-1">
              <div class="project-media-overlay">
                <span class="project-badge">Full-Stack</span>
              </div>
              <div class="mockup-screen">
                <div class="mockup-header">
                  <span class="mock-dot"></span>
                  <span class="mock-dot"></span>
                  <span class="mock-dot"></span>
                </div>
                <div class="mockup-canvas">
                  <div class="canvas-bar"></div>
                  <div class="canvas-grid">
                    <div class="canvas-box"></div>
                    <div class="canvas-box"></div>
                  </div>
                </div>
              </div>
            </div>
            <div class="project-content">
              <h3 class="project-title">CloudPulse — Real-Time Infrastructure Monitoring</h3>
              <p class="project-desc">
                High-throughput telemetry dashboard processing 100k+ events/sec with live anomaly detection, customizable alerts, and interactive latency charts.
              </p>
              <div class="project-tags">
                <span class="tag">Next.js 14</span>
                <span class="tag">TypeScript</span>
                <span class="tag">Go</span>
                <span class="tag">TimescaleDB</span>
                <span class="tag">WebSockets</span>
              </div>
              <div class="project-links">
                <a href="https://github.com" target="_blank" rel="noopener noreferrer" class="link-item">
                  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M9 19c-5 1.5-5-2.5-7-3m14 6v-3.87a3.37 3.37 0 0 0-.94-2.61c3.14-.35 6.44-1.54 6.44-7A5.44 5.44 0 0 0 20 4.77 5.07 5.07 0 0 0 19.91 1S18.73.65 16 2.48a13.38 13.38 0 0 0-7 0C6.27.65 5.09 1 5.09 1A5.07 5.07 0 0 0 5 4.77a5.44 5.44 0 0 0-1.5 3.78c0 5.42 3.3 6.61 6.44 7A3.37 3.37 0 0 0 9 18.13V22"></path></svg>
                  <span>Code</span>
                </a>
                <a href="#projects" class="link-item link-demo">
                  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"></path><polyline points="15 3 21 3 21 9"></polyline><line x1="10" y1="14" x2="21" y2="3"></line></svg>
                  <span>Live Demo</span>
                </a>
              </div>
            </div>
          </article>

<article class="project-card" data-category="frontend">
            <div class="project-media gradient-preview-2">
              <div class="project-media-overlay">
                <span class="project-badge">Frontend & UI</span>
              </div>
              <div class="mockup-screen">
                <div class="mockup-header">
                  <span class="mock-dot"></span>
                  <span class="mock-dot"></span>
                  <span class="mock-dot"></span>
                </div>
                <div class="mockup-canvas">
                  <div class="canvas-chart">
                    <span class="chart-col col-1"></span>
                    <span class="chart-col col-2"></span>
                    <span class="chart-col col-3"></span>
                    <span class="chart-col col-4"></span>
                  </div>
                </div>
              </div>
            </div>
            <div class="project-content">
              <h3 class="project-title">Aura Design System & Component Studio</h3>
              <p class="project-desc">
                Accessible, themeable component library with 40+ accessible UI primitives, automated WCAG 2.1 compliance tests, and interactive documentation.
              </p>
              <div class="project-tags">
                <span class="tag">React</span>
                <span class="tag">Radix UI</span>
                <span class="tag">Tailwind</span>
                <span class="tag">Storybook</span>
                <span class="tag">Figma API</span>
              </div>
              <div class="project-links">
                <a href="https://github.com" target="_blank" rel="noopener noreferrer" class="link-item">
                  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M9 19c-5 1.5-5-2.5-7-3m14 6v-3.87a3.37 3.37 0 0 0-.94-2.61c3.14-.35 6.44-1.54 6.44-7A5.44 5.44 0 0 0 20 4.77 5.07 5.07 0 0 0 19.91 1S18.73.65 16 2.48a13.38 13.38 0 0 0-7 0C6.27.65 5.09 1 5.09 1A5.07 5.07 0 0 0 5 4.77a5.44 5.44 0 0 0-1.5 3.78c0 5.42 3.3 6.61 6.44 7A3.37 3.37 0 0 0 9 18.13V22"></path></svg>
                  <span>Code</span>
                </a>
                <a href="#projects" class="link-item link-demo">
                  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"></path><polyline points="15 3 21 3 21 9"></polyline><line x1="10" y1="14" x2="21" y2="3"></line></svg>
                  <span>Docs & Demo</span>
                </a>
              </div>
            </div>
          </article>

<article class="project-card" data-category="cloud">
            <div class="project-media gradient-preview-3">
              <div class="project-media-overlay">
                <span class="project-badge">Cloud / Systems</span>
              </div>
              <div class="mockup-screen">
                <div class="mockup-header">
                  <span class="mock-dot"></span>
                  <span class="mock-dot"></span>
                  <span class="mock-dot"></span>
                </div>
                <div class="mockup-canvas console-canvas">
                  <div class="console-line text-green">$ deploy --prod</div>
                  <div class="console-line text-muted">Building container... [Done]</div>
                  <div class="console-line text-cyan">Cluster synced: 3 pods ready</div>
                </div>
              </div>
            </div>
            <div class="project-content">
              <h3 class="project-title">KubeFlow Edge — Multi-Cluster Orchestrator</h3>
              <p class="project-desc">
                Automated Kubernetes workload orchestrator with zero-downtime rolling canary deployments and dynamic resource auto-scaling rules.
              </p>
              <div class="project-tags">
                <span class="tag">Go</span>
                <span class="tag">Docker</span>
                <span class="tag">Kubernetes</span>
                <span class="tag">AWS EKS</span>
                <span class="tag">gRPC</span>
              </div>
              <div class="project-links">
                <a href="https://github.com" target="_blank" rel="noopener noreferrer" class="link-item">
                  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M9 19c-5 1.5-5-2.5-7-3m14 6v-3.87a3.37 3.37 0 0 0-.94-2.61c3.14-.35 6.44-1.54 6.44-7A5.44 5.44 0 0 0 20 4.77 5.07 5.07 0 0 0 19.91 1S18.73.65 16 2.48a13.38 13.38 0 0 0-7 0C6.27.65 5.09 1 5.09 1A5.07 5.07 0 0 0 5 4.77a5.44 5.44 0 0 0-1.5 3.78c0 5.42 3.3 6.61 6.44 7A3.37 3.37 0 0 0 9 18.13V22"></path></svg>
                  <span>Code</span>
                </a>
                <a href="#projects" class="link-item link-demo">
                  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"></path><polyline points="15 3 21 3 21 9"></polyline><line x1="10" y1="14" x2="21" y2="3"></line></svg>
                  <span>Architecture</span>
                </a>
              </div>
            </div>
          </article>

<article class="project-card" data-category="fullstack">
            <div class="project-media gradient-preview-4">
              <div class="project-media-overlay">
                <span class="project-badge">Full-Stack</span>
              </div>
              <div class="mockup-screen">
                <div class="mockup-header">
                  <span class="mock-dot"></span>
                  <span class="mock-dot"></span>
                  <span class="mock-dot"></span>
                </div>
                <div class="mockup-canvas">
                  <div class="canvas-cards-row">
                    <div class="mini-card"></div>
                    <div class="mini-card active-card"></div>
                    <div class="mini-card"></div>
                  </div>
                </div>
              </div>
            </div>
            <div class="project-content">
              <h3 class="project-title">NexusAI — Collaborative Knowledge Workspace</h3>
              <p class="project-desc">
                AI-driven document collaboration canvas integrating vector retrieval (RAG), live cursor synchronization, and conversational intelligence.
              </p>
              <div class="project-tags">
                <span class="tag">TypeScript</span>
                <span class="tag">Python</span>
                <span class="tag">LangChain</span>
                <span class="tag">Pinecone</span>
                <span class="tag">PostgreSQL</span>
              </div>
              <div class="project-links">
                <a href="https://github.com" target="_blank" rel="noopener noreferrer" class="link-item">
                  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M9 19c-5 1.5-5-2.5-7-3m14 6v-3.87a3.37 3.37 0 0 0-.94-2.61c3.14-.35 6.44-1.54 6.44-7A5.44 5.44 0 0 0 20 4.77 5.07 5.07 0 0 0 19.91 1S18.73.65 16 2.48a13.38 13.38 0 0 0-7 0C6.27.65 5.09 1 5.09 1A5.07 5.07 0 0 0 5 4.77a5.44 5.44 0 0 0-1.5 3.78c0 5.42 3.3 6.61 6.44 7A3.37 3.37 0 0 0 9 18.13V22"></path></svg>
                  <span>Code</span>
                </a>
                <a href="#projects" class="link-item link-demo">
                  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"></path><polyline points="15 3 21 3 21 9"></polyline><line x1="10" y1="14" x2="21" y2="3"></line></svg>
                  <span>Live App</span>
                </a>
              </div>
            </div>
          </article>
        </div>
      </div>
    </section>

<section class="section" id="experience">
      <div class="container">
        <div class="section-header">
          <p class="section-tag">Career Journey</p>
          <h2 class="section-title">Experience & Education Milestones</h2>
        </div>

<div class="timeline">
          
          <div class="timeline-item">
            <div class="timeline-dot"></div>
            <div class="timeline-content">
              <div class="timeline-header">
                <div>
                  <h3 class="role-title">Lead Full-Stack Engineer</h3>
                  <p class="company-name">Synthetix Cloud Labs • San Francisco, CA</p>
                </div>
                <span class="timeline-date">2023 — Present</span>
              </div>
              <p class="timeline-desc">
                Spearheaded the rebuild of the core telemetry analytics platform, resulting in a 40% reduction in query latency and 2.5x increase in daily active user engagement. Mentored 5 junior engineers and established automated end-to-end testing pipelines.
              </p>
              <div class="timeline-tags">
                <span>React</span>
                <span>Next.js</span>
                <span>Node.js</span>
                <span>Docker</span>
                <span>AWS</span>
              </div>
            </div>
          </div>

<div class="timeline-item">
            <div class="timeline-dot"></div>
            <div class="timeline-content">
              <div class="timeline-header">
                <div>
                  <h3 class="role-title">Senior Software Engineer</h3>
                  <p class="company-name">Vanguard Interactive • New York, NY</p>
                </div>
                <span class="timeline-date">2021 — 2023</span>
              </div>
              <p class="timeline-desc">
                Designed and delivered mission-critical SaaS dashboards for Fortune 500 financial clients. Implemented design system standards and spearheaded migration from legacy REST services to GraphQL federation.
              </p>
              <div class="timeline-tags">
                <span>TypeScript</span>
                <span>GraphQL</span>
                <span>PostgreSQL</span>
                <span>Redis</span>
                <span>Tailwind</span>
              </div>
            </div>
          </div>

<div class="timeline-item">
            <div class="timeline-dot"></div>
            <div class="timeline-content">
              <div class="timeline-header">
                <div>
                  <h3 class="role-title">Full-Stack Developer</h3>
                  <p class="company-name">Pulse Innovations • Austin, TX</p>
                </div>
                <span class="timeline-date">2019 — 2021</span>
              </div>
              <p class="timeline-desc">
                Built responsive web applications, payment gateways, and real-time notification microservices. Maintained 99.9% uptime during peak holiday traffic events.
              </p>
              <div class="timeline-tags">
                <span>JavaScript</span>
                <span>React</span>
                <span>Python</span>
                <span>Stripe API</span>
                <span>Docker</span>
              </div>
            </div>
          </div>

<div class="timeline-item education-item">
            <div class="timeline-dot dot-edu"></div>
            <div class="timeline-content">
              <div class="timeline-header">
                <div>
                  <h3 class="role-title">B.S. in Computer Science</h3>
                  <p class="company-name">University of California, Berkeley</p>
                </div>
                <span class="timeline-date">Graduated with Honors</span>
              </div>
              <p class="timeline-desc">
                Coursework: Distributed Systems, Algorithms & Data Structures, Database Systems, Computer Networks, Human-Computer Interaction (HCI).
              </p>
            </div>
          </div>
        </div>
      </div>
    </section>

<section class="section testimonials-section">
      <div class="container">
        <div class="section-header">
          <p class="section-tag">Testimonials</p>
          <h2 class="section-title">What colleagues and clients say</h2>
        </div>

<div class="testimonials-grid">
          <div class="testimonial-card">
            <div class="stars">★★★★★</div>
            <p class="testimonial-quote">
              "Alex has a rare combination of rock-solid systems engineering ability and a sharp eye for visual aesthetics. The dashboards he delivered surpassed all performance expectations."
            </p>
            <div class="testimonial-author">
              <div class="author-avatar">SC</div>
              <div>
                <h4 class="author-name">Sarah Chen</h4>
                <p class="author-role">VP of Product at Synthetix</p>
              </div>
            </div>
          </div>

<div class="testimonial-card">
            <div class="stars">★★★★★</div>
            <p class="testimonial-quote">
              "Working alongside Alex was a masterclass in clean architecture. He consistently delivered scalable code, proactive communication, and great empathy for user experience."
            </p>
            <div class="testimonial-author">
              <div class="author-avatar">MD</div>
              <div>
                <h4 class="author-name">Marcus Davis</h4>
                <p class="author-role">Principal Architect at Vanguard</p>
              </div>
            </div>
          </div>

<div class="testimonial-card">
            <div class="stars">★★★★★</div>
            <p class="testimonial-quote">
              "Alex transformed our rough prototype into an enterprise-grade web application in record time. Our users rave about how snappy and intuitive the app feels."
            </p>
            <div class="testimonial-author">
              <div class="author-avatar">EL</div>
              <div>
                <h4 class="author-name">Elena Lopez</h4>
                <p class="author-role">Founder at Pulse Innovations</p>
              </div>
            </div>
          </div>
        </div>
      </div>
    </section>

<section class="section" id="contact">
      <div class="container">
        <div class="section-header">
          <p class="section-tag">Get in Touch</p>
          <h2 class="section-title">Let's build something extraordinary together</h2>
        </div>

<div class="contact-grid">
          
          <div class="contact-info">
            <h3 class="info-title">Have a project in mind or want to collaborate?</h3>
            <p class="info-desc">
              I'm always interested in hearing about new product challenges, contract opportunities, architectural consulting, or open-source initiatives.
            </p>

<div class="info-items">
              <div class="info-card">
                <div class="info-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z"></path><polyline points="22,6 12,13 2,6"></polyline></svg>
                </div>
                <div>
                  <span class="info-label">Email Me</span>
                  <a href="mailto:alex.rivera@example.com" class="info-value">alex.rivera@example.com</a>
                </div>
              </div>

<div class="info-card">
                <div class="info-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 10c0 7-9 13-9 13s-9-6-9-13a9 9 0 0 1 18 0z"></path><circle cx="12" cy="10" r="3"></circle></svg>
                </div>
                <div>
                  <span class="info-label">Location</span>
                  <span class="info-value">San Francisco, CA (Open to Remote Worldwide)</span>
                </div>
              </div>

<div class="info-card">
                <div class="info-icon">
                  <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"></circle><polyline points="12 6 12 12 14 14"></polyline></svg>
                </div>
                <div>
                  <span class="info-label">Response Time</span>
                  <span class="info-value">Within 24 business hours</span>
                </div>
              </div>
            </div>
          </div>

<div class="contact-form-wrapper">
            <form class="contact-form" id="contact-form" novalidate>
              <div class="form-group">
                <label for="name" class="form-label">Your Name <span class="required">*</span></label>
                <input type="text" id="name" name="name" class="form-input" placeholder="e.g. Jane Doe" required>
                <span class="form-error" id="name-error">Please enter your name.</span>
              </div>

<div class="form-group">
                <label for="email" class="form-label">Email Address <span class="required">*</span></label>
                <input type="email" id="email" name="email" class="form-input" placeholder="e.g. jane@company.com" required>
                <span class="form-error" id="email-error">Please enter a valid email address.</span>
              </div>

<div class="form-group">
                <label for="subject" class="form-label">Subject</label>
                <input type="text" id="subject" name="subject" class="form-input" placeholder="e.g. Project inquiry / Full-time role">
              </div>

<div class="form-group">
                <label for="message" class="form-label">Message <span class="required">*</span></label>
                <input id="message" name="message" class="form-input form-textarea" rows="5" placeholder="Tell me about your project goals, timeline, and budget..." required/>
                <span class="form-error" id="message-error">Please write a message.</span>
              </div>

<button type="submit" class="btn btn-primary btn-submit w-full" id="submit-btn">
                <span class="btn-text">Send Message</span>
                <span class="btn-spinner" aria-hidden="true"></span>
              </button>
            </form>
          </div>
        </div>
      </div>
    </section>
  </main>

<footer class="footer">
    <div class="container footer-container">
      <div class="footer-brand">
        <a href="#hero" class="logo">
          <span class="logo-bracket"><</span>
          <span class="logo-name">AlexRivera</span>
          <span class="logo-bracket">/></span>
        </a>
        <p class="footer-tagline">Building clean, scalable, and human-centered software.</p>
      </div>

<div class="footer-nav">
        <a href="#hero">Home</a>
        <a href="#about">About</a>
        <a href="#skills">Skills</a>
        <a href="#projects">Projects</a>
        <a href="#experience">Experience</a>
        <a href="#contact">Contact</a>
      </div>

<div class="footer-bottom">
        <p class="copyright">
          © <span id="current-year"></span> Alex Rivera. Built with clean HTML5 & CSS3. All rights reserved.
        </p>
        <button class="back-to-top" id="back-to-top" aria-label="Back to top">
          <span>Back to Top</span>
          <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
            <line x1="12" y1="19" x2="12" y2="5"></line>
            <polyline points="5 12 12 5 19 12"></polyline>
          </svg>
        </button>
      </div>
    </div>
  </footer>

<div class="toast" id="toast" role="alert" aria-live="assertive" aria-atomic="true">
    <div class="toast-icon">✓</div>
    <div class="toast-content">
      <h4 class="toast-title">Message Sent!</h4>
      <p class="toast-message">Thank you for reaching out. I'll get back to you shortly.</p>
    </div>
  </div>

CSS

/* ==========================================================================
   ALEX RIVERA PORTFOLIO — MODERN DESIGN SYSTEM & STYLESHEET
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties / Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Dark Theme (Default) */
  --bg-primary: #0a0e17;
  --bg-secondary: #0f1626;
  --bg-card: rgba(20, 27, 45, 0.65);
  --bg-card-hover: rgba(28, 38, 64, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(99, 102, 241, 0.4);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-highlight: #ffffff;

--accent-primary: #6366f1;       /* Indigo */
  --accent-secondary: #06b6d4;     /* Cyan */
  --accent-tertiary: #a855f7;      /* Purple */
  --accent-emerald: #10b981;       /* Emerald */
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #06b6d4 100%);
  --accent-gradient-hover: linear-gradient(135deg, #4f46e5 0%, #9333ea 50%, #0891b2 100%);
  --glow-primary: rgba(99, 102, 241, 0.25);
  --glow-secondary: rgba(6, 182, 212, 0.2);

--font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

--radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

--shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 35px var(--glow-primary);

--transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --container-max-width: 1200px;
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #edf2f7;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-hover: rgba(99, 102, 241, 0.5);

--text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-highlight: #020617;

--accent-primary: #4f46e5;
  --accent-secondary: #0891b2;
  --accent-tertiary: #9333ea;
  --glow-primary: rgba(99, 102, 241, 0.15);
  --glow-secondary: rgba(6, 182, 212, 0.12);

--shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);
}

/* --------------------------------------------------------------------------
   2. Reset & Global Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

body {
  line-height: 1.65;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button, input, textarea {
  font-family: inherit;
  font-size: 1rem;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding: 6.5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-primary);
  margin-bottom: 0.6rem;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.25;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.w-full {
  width: 100%;
}

/* --------------------------------------------------------------------------
   3. Ambient Background Light Orbs
   -------------------------------------------------------------------------- */
.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(140px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.55;
  transition: opacity var(--transition-normal);
}

.bg-glow-1 {
  width: 500px;
  height: 500px;
  top: -120px;
  left: -100px;
  background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
}

.bg-glow-2 {
  width: 550px;
  height: 550px;
  top: 40%;
  right: -150px;
  background: radial-gradient(circle, var(--accent-secondary) 0%, transparent 70%);
}

/* --------------------------------------------------------------------------
   4. Buttons & Badges
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  padding: 0.75rem 1.4rem;
  font-size: 0.95rem;
  transition: all var(--transition-normal);
  text-align: center;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.9rem 1.8rem;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 16px var(--glow-primary);
}

.btn-primary:hover {
  background: var(--accent-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--glow-primary);
}

.btn-outline {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
}

.btn-outline:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-hover);
  transform: translateY(-2px);
}

/* Pulse Beacon Badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 1rem;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: #10b981;
  margin-bottom: 1.5rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

/* --------------------------------------------------------------------------
   5. Header & Navigation
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

[data-theme="light"] .header {
  background: rgba(248, 250, 252, 0.8);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  color: var(--text-primary);
}

.logo-bracket {
  color: var(--accent-primary);
  font-weight: 900;
}

.logo-name {
  margin: 0 0.15rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.3rem 0;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-highlight);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-hover);
  transform: rotate(15deg);
}

.sun-icon {
  display: block;
}

.moon-icon {
  display: none;
}

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

[data-theme="light"] .moon-icon {
  display: block;
}

/* Mobile Toggle Hamburger */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 38px;
  height: 38px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px;
}

.mobile-toggle .bar {
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
}

.mobile-toggle.open .bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.mobile-toggle.open .bar:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.open .bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  height: calc(100vh - 72px);
  background: rgba(10, 14, 23, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: none;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
  z-index: 999;
}

[data-theme="light"] .mobile-drawer {
  background: rgba(248, 250, 252, 0.95);
}

.mobile-drawer.open {
  display: block;
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer-content {
  padding: 2.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-nav-link {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
  padding: 0.4rem 0;
}

.mobile-nav-link:hover {
  color: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   6. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: 5rem;
  padding-bottom: 6rem;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 4rem;
}

.hero-title {
  font-size: clamp(2.3rem, 4.5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 1.8vw, 1.2rem);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2.2rem;
  max-width: 580px;
}

.hero-subtitle strong {
  color: var(--text-primary);
  font-weight: 600;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 2.5rem;
}

.hero-socials {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.social-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

.social-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.social-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.social-icon:hover {
  color: var(--accent-primary);
  border-color: var(--border-color-hover);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

/* Hero Code Visual Card */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.code-card-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
}

.code-card {
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
}

[data-theme="light"] .code-card {
  background: #1e293b;
  color: #f8fafc;
}

.card-header {
  display: flex;
  align-items: center;
  padding: 0.85rem 1.25rem;
  background: rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.card-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  margin-right: 6px;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.card-title {
  margin-left: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #94a3b8;
}

.card-body {
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  overflow-x: auto;
}

.token-keyword { color: #f43f5e; font-weight: 600; }
.token-variable { color: #38bdf8; }
.token-property { color: #a78bfa; }
.token-string { color: #34d399; }

/* Floating Badges */
.floating-badge {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.15rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  z-index: 2;
  animation: float 4s ease-in-out infinite;
}

.badge-top {
  top: -20px;
  right: -20px;
  animation-delay: 0s;
}

.badge-bottom {
  bottom: -20px;
  left: -20px;
  animation-delay: 2s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.badge-icon {
  font-size: 1.25rem;
}

.badge-text {
  display: flex;
  flex-direction: column;
}

.badge-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

.badge-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   7. Stats Counter Bar
   -------------------------------------------------------------------------- */
.stats-section {
  padding: 2.5rem 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.stat-card {
  text-align: center;
  padding: 1rem;
}

.stat-number {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.3rem;
}

.stat-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   8. About Section
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  align-items: center;
  gap: 4rem;
}

.about-image-card {
  display: flex;
  justify-content: center;
}

.about-avatar-wrapper {
  position: relative;
  width: 280px;
  height: 280px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.about-avatar-wrapper::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: var(--accent-gradient);
  border-radius: inherit;
  z-index: -1;
  opacity: 0.5;
}

.avatar-placeholder {
  color: var(--accent-primary);
  opacity: 0.8;
}

.avatar-tag {
  position: absolute;
  bottom: 1rem;
  background: rgba(10, 14, 23, 0.85);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
}

[data-theme="light"] .avatar-tag {
  background: rgba(255, 255, 255, 0.9);
}

.about-heading {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 1.25rem;
}

.text-body {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin: 1.8rem 0;
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.highlight-item strong {
  color: var(--text-primary);
}

.highlight-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 2px;
}

.about-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

/* --------------------------------------------------------------------------
   9. Skills Section
   -------------------------------------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
}

.skill-category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
}

.skill-category-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.category-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.icon-blue { background: rgba(59, 130, 246, 0.15); color: #3b82f6; }
.icon-purple { background: rgba(168, 85, 247, 0.15); color: #a855f7; }
.icon-cyan { background: rgba(6, 182, 212, 0.15); color: #06b6d4; }
.icon-emerald { background: rgba(16, 185, 129, 0.15); color: #10b981; }

.category-title {
  font-size: 1.2rem;
  font-weight: 700;
}

.category-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

[data-theme="light"] .skill-tag {
  background: rgba(0, 0, 0, 0.04);
}

.skill-tag:hover {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   10. Featured Projects Section
   -------------------------------------------------------------------------- */
.project-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

.filter-btn.active {
  background: var(--accent-gradient);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 14px var(--glow-primary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.project-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.project-card.hide {
  display: none;
}

.project-media {
  height: 200px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gradient-preview-1 {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
}

.gradient-preview-2 {
  background: linear-gradient(135deg, #134e4a 0%, #065f46 100%);
}

.gradient-preview-3 {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

.gradient-preview-4 {
  background: linear-gradient(135deg, #581c87 0%, #3b0764 100%);
}

.project-media-overlay {
  position: absolute;
  top: 1rem;
  left: 1rem;
  z-index: 2;
}

.project-badge {
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
}

/* Mockup elements inside project media */
.mockup-screen {
  width: 78%;
  height: 72%;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  padding: 8px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal);
}

.project-card:hover .mockup-screen {
  transform: scale(1.04);
}

.mockup-header {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
}

.mock-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
}

.canvas-bar {
  height: 8px;
  width: 50%;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  margin-bottom: 10px;
}

.canvas-grid {
  display: flex;
  gap: 8px;
}

.canvas-box {
  flex: 1;
  height: 45px;
  background: rgba(99, 102, 241, 0.25);
  border-radius: 4px;
}

.canvas-chart {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  height: 55px;
  padding: 0 10px;
}

.chart-col {
  flex: 1;
  background: var(--accent-secondary);
  border-radius: 3px 3px 0 0;
}

.col-1 { height: 40%; }
.col-2 { height: 75%; }
.col-3 { height: 55%; }
.col-4 { height: 95%; }

.console-canvas {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.5;
  padding: 6px;
}

.text-green { color: #10b981; }
.text-cyan { color: #06b6d4; }

.canvas-cards-row {
  display: flex;
  gap: 6px;
  align-items: center;
  height: 100%;
}

.mini-card {
  flex: 1;
  height: 48px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
}

.active-card {
  background: rgba(168, 85, 247, 0.4);
  border: 1px solid rgba(168, 85, 247, 0.8);
}

.project-content {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.project-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.5rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--accent-primary);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.project-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.link-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.link-item:hover {
  color: var(--text-primary);
}

.link-demo {
  color: var(--accent-primary);
}

.link-demo:hover {
  color: var(--accent-secondary);
}

/* --------------------------------------------------------------------------
   11. Career Timeline Section
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  max-width: 820px;
  margin: 0 auto;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 7px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 10px var(--glow-primary);
}

.dot-edu {
  background: var(--accent-secondary);
  box-shadow: 0 0 10px var(--glow-secondary);
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
}

.timeline-content:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-hover);
  transform: translateX(4px);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.role-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.company-name {
  font-size: 0.95rem;
  color: var(--accent-primary);
  font-weight: 600;
}

.timeline-date {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

[data-theme="light"] .timeline-date {
  background: rgba(0, 0, 0, 0.04);
}

.timeline-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline-tags span {
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

[data-theme="light"] .timeline-tags span {
  background: rgba(0, 0, 0, 0.04);
}

/* --------------------------------------------------------------------------
   12. Testimonials Section
   -------------------------------------------------------------------------- */
.testimonials-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
}

.testimonial-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-hover);
  transform: translateY(-4px);
}

.stars {
  color: #f59e0b;
  font-size: 1.1rem;
  letter-spacing: 2px;
  margin-bottom: 1rem;
}

.testimonial-quote {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.65;
  font-style: italic;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #ffffff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.author-name {
  font-size: 1rem;
  font-weight: 700;
}

.author-role {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   13. Contact Section
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3.5rem;
  align-items: start;
}

.info-title {
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.info-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 2rem;
}

.info-items {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.info-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  transition: all var(--transition-fast);
}

.info-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-hover);
  transform: translateX(4px);
}

.info-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.info-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.info-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

a.info-value:hover {
  color: var(--accent-primary);
}

/* Contact Form */
.contact-form-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.required {
  color: #ef4444;
}

.form-input {
  width: 100%;
  padding: 0.85rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

[data-theme="light"] .form-input {
  background: #ffffff;
}

.form-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--glow-primary);
  background: rgba(255, 255, 255, 0.06);
}

[data-theme="light"] .form-input:focus {
  background: #ffffff;
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  display: none;
  font-size: 0.8rem;
  color: #ef4444;
  margin-top: 0.2rem;
}

.form-group.has-error .form-input {
  border-color: #ef4444;
}

.form-group.has-error .form-error {
  display: block;
}

/* Submit Button & Spinner */
.btn-submit {
  position: relative;
  height: 48px;
}

.btn-spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.btn-submit.loading .btn-text {
  display: none;
}

.btn-submit.loading .btn-spinner {
  display: block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --------------------------------------------------------------------------
   14. Footer
   -------------------------------------------------------------------------- */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2.5rem 0;
}

.footer-container {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-tagline {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-nav a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-nav a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.back-to-top:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   15. Toast Feedback Notification
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color-hover);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 380px;
  z-index: 2000;
  transform: translateY(120%);
  opacity: 0;
  transition: all var(--transition-smooth);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #10b981;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  flex-shrink: 0;
}

.toast-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.toast-message {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   16. Responsive Media Queries
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

.hero-buttons {
    justify-content: center;
  }

.about-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }

.about-highlights {
    text-align: left;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
  }

.about-actions {
    justify-content: center;
  }

.contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .nav-menu,
  .header-cta {
    display: none;
  }

.mobile-toggle {
    display: flex;
  }

.stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

.section {
    padding: 4.5rem 0;
  }

.hero-visual {
    width: 100%;
  }

.code-card-wrapper {
    max-width: 100%;
  }

.floating-badge {
    display: none;
  }

.projects-grid {
    grid-template-columns: 1fr;
  }

.timeline {
    padding-left: 1.5rem;
  }

.timeline-dot {
    left: -1.5rem;
  }

.contact-form-wrapper {
    padding: 1.75rem;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

.hero-buttons {
    flex-direction: column;
    width: 100%;
  }

.hero-buttons .btn {
    width: 100%;
  }

.toast {
    left: 16px;
    right: 16px;
    bottom: 16px;
  }
}

/**
 * Alex Rivera Portfolio — Interactive Scripts
 * Handles Theme Toggle, Navigation, Project Filtering, Form Validation, and Micro-interactions.
 */

document.addEventListener('DOMContentLoaded', () => {
  // -------------------------------------------------------------------------
  // 1. Current Year Footer
  // -------------------------------------------------------------------------
  const yearEl = document.getElementById('current-year');
  if (yearEl) {
    yearEl.textContent = new Date().getFullYear();
  }

// -------------------------------------------------------------------------
  // 2. Theme Toggle (Dark / Light Mode)
  // -------------------------------------------------------------------------
  const themeToggleBtn = document.getElementById('theme-toggle');
  const rootHtml = document.documentElement;

// Retrieve stored theme or default to system preference
  const savedTheme = localStorage.getItem('portfolio-theme');
  const systemPrefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
  const initialTheme = savedTheme || (systemPrefersDark ? 'dark' : 'light');

rootHtml.setAttribute('data-theme', initialTheme);

if (themeToggleBtn) {
    themeToggleBtn.addEventListener('click', () => {
      const currentTheme = rootHtml.getAttribute('data-theme');
      const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
      rootHtml.setAttribute('data-theme', newTheme);
      localStorage.setItem('portfolio-theme', newTheme);
    });
  }

// -------------------------------------------------------------------------
  // 3. Header Scroll Elevation
  // -------------------------------------------------------------------------
  const header = document.getElementById('header');
  window.addEventListener('scroll', () => {
    if (window.scrollY > 40) {
      header.classList.add('scrolled');
    } else {
      header.classList.remove('scrolled');
    }
  }, { passive: true });

// -------------------------------------------------------------------------
  // 4. Mobile Navigation Drawer
  // -------------------------------------------------------------------------
  const mobileToggle = document.getElementById('mobile-toggle');
  const mobileDrawer = document.getElementById('mobile-drawer');
  const mobileNavLinks = document.querySelectorAll('.mobile-nav-link');

if (mobileToggle && mobileDrawer) {
    mobileToggle.addEventListener('click', () => toggleMobileMenu());

mobileNavLinks.forEach(link => {
      link.addEventListener('click', () => toggleMobileMenu(false));
    });

// Close when clicking outside drawer content
    mobileDrawer.addEventListener('click', (e) => {
      if (e.target === mobileDrawer) {
        toggleMobileMenu(false);
      }
    });
  }

// -------------------------------------------------------------------------
  // 5. Active Navigation Link on Scroll (Intersection Observer)
  // -------------------------------------------------------------------------
  const sections = document.querySelectorAll('section[id]');
  const desktopNavLinks = document.querySelectorAll('.nav-link');

const navObserverOptions = {
    root: null,
    rootMargin: '-20% 0px -70% 0px',
    threshold: 0
  };

sections.forEach(section => navObserver.observe(section));

// -------------------------------------------------------------------------
  // 6. Project Category Filtering
  // -------------------------------------------------------------------------
  const filterBtns = document.querySelectorAll('.filter-btn');
  const projectCards = document.querySelectorAll('.project-card');

filterBtns.forEach(btn => {
    btn.addEventListener('click', () => {
      // Update active button state
      filterBtns.forEach(b => b.classList.remove('active'));
      btn.classList.add('active');

const filterValue = btn.getAttribute('data-filter');

projectCards.forEach(card => {
        const cardCategory = card.getAttribute('data-category');
        if (filterValue === 'all' || cardCategory === filterValue) {
          card.classList.remove('hide');
        } else {
          card.classList.add('hide');
        }
      });
    });
  });

// -------------------------------------------------------------------------
  // 7. Back to Top Button
  // -------------------------------------------------------------------------
  const backToTopBtn = document.getElementById('back-to-top');
  if (backToTopBtn) {
    backToTopBtn.addEventListener('click', () => {
      window.scrollTo({
        top: 0,
        behavior: 'smooth'
      });
    });
  }

// -------------------------------------------------------------------------
  // 8. Contact Form Handling & Validation
  // -------------------------------------------------------------------------
  const contactForm = document.getElementById('contact-form');
  const submitBtn = document.getElementById('submit-btn');
  const toast = document.getElementById('toast');

function showToast(title, message) {
    if (!toast) return;
    if (title) toast.querySelector('.toast-title').textContent = title;
    if (message) toast.querySelector('.toast-message').textContent = message;

toast.classList.add('show');
    setTimeout(() => {
      toast.classList.remove('show');
    }, 4500);
  }

function validateEmail(email) {
    return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);
  }

if (contactForm) {
    contactForm.addEventListener('submit', (e) => {
      e.preventDefault();

const nameInput = document.getElementById('name');
      const emailInput = document.getElementById('email');
      const messageInput = document.getElementById('message');

let isValid = true;

// Validate Name
      if (!nameInput.value.trim()) {
        nameInput.closest('.form-group').classList.add('has-error');
        isValid = false;
      } else {
        nameInput.closest('.form-group').classList.remove('has-error');
      }

// Validate Email
      if (!emailInput.value.trim() || !validateEmail(emailInput.value.trim())) {
        emailInput.closest('.form-group').classList.add('has-error');
        isValid = false;
      } else {
        emailInput.closest('.form-group').classList.remove('has-error');
      }

// Validate Message
      if (!messageInput.value.trim()) {
        messageInput.closest('.form-group').classList.add('has-error');
        isValid = false;
      } else {
        messageInput.closest('.form-group').classList.remove('has-error');
      }

if (!isValid) return;

// Simulate sending state
      if (submitBtn) {
        submitBtn.classList.add('loading');
        submitBtn.disabled = true;
      }

setTimeout(() => {
        if (submitBtn) {
          submitBtn.classList.remove('loading');
          submitBtn.disabled = false;
        }

contactForm.reset();
        showToast('Message Sent!', 'Thank you, Alex will get back to you within 24 hours.');
      }, 1000);
    });

// Clear error on input typing
    const inputs = contactForm.querySelectorAll('.form-input');
    inputs.forEach(input => {
      input.addEventListener('input', () => {
        const group = input.closest('.form-group');
        if (group && group.classList.contains('has-error')) {
          group.classList.remove('has-error');
        }
      });
    });
  }
});