:root {
      /* Palette */
      --bg: #09090b;
      --surface: #131316;
      --surface-hover: #1c1c21;
      --primary: #e11d48;
      --text-heading: #fafafa;
      --text-body: #a1a1aa;
      --text-muted: #71717a;
      
      /* Typography */
      --font-display: 'Playfair Display', serif;
      --font-body: 'Manrope', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      
      /* Layout & Spacing */
      --spine-left: 8vw;
      --container-pl: calc(var(--spine-left) + 4rem);
      --container-pr: 8vw;
      
      /* Animation */
      --ease: cubic-bezier(0.16, 1, 0.3, 1);
      --transition-slow: 600ms var(--ease);
      --transition-med: 420ms var(--ease);
      --transition-fast: 250ms var(--ease);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      background-color: var(--bg);
      color: var(--text-body);
      font-family: var(--font-body);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    ::selection {
      background: var(--primary);
      color: #fff;
    }

    /* Scrollbar */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: var(--bg);
    }
    ::-webkit-scrollbar-thumb {
      background: var(--surface-hover);
      border-radius: 3px;
    }

    /* Typography Utilities */
    h1, h2, h3, h4 {
      font-family: var(--font-display);
      color: var(--text-heading);
      font-weight: 500;
      line-height: 1.2;
    }

    .mono {
      font-family: var(--font-mono);
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

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

    a:hover {
      color: var(--primary);
    }

    /* Signature Element: The Spine */
    .spine {
      position: fixed;
      top: 0;
      left: var(--spine-left);
      width: 1px;
      height: 100vh;
      background: linear-gradient(to bottom, transparent, var(--surface-hover), transparent);
      z-index: 10;
      pointer-events: none;
    }

    .spine-progress {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 0%;
      background: var(--primary);
      transition: height 0.1s linear;
    }

    /* Navigation */
    nav {
      position: fixed;
      top: 0;
      width: 100%;
      padding: 2rem var(--container-pr) 2rem var(--container-pl);
      display: flex;
      justify-content: flex-end;
      z-index: 100;
      mix-blend-mode: difference;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
    }

    .nav-links a {
      font-size: 0.875rem;
      color: var(--text-heading);
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 1px;
      background: var(--primary);
      transition: width var(--transition-med);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    /* Layout Container */
    section {
      padding: 2rem var(--container-pr) 2rem var(--container-pl);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      position: relative;
    }

    .section-num {
      position: absolute;
      left: calc(var(--spine-left) - 3rem);
      top: 8rem;
      writing-mode: vertical-rl;
      transform: rotate(180deg);
      color: var(--text-muted);
    }

    /* Reveal Animation Classes */
    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity var(--transition-slow), transform var(--transition-slow);
    }
    
    .reveal.active {
      opacity: 1;
      transform: translateY(0);
    }

    /* Staggering for Hero */
    .stagger-1 { transition-delay: 100ms; }
    .stagger-2 { transition-delay: 200ms; }
    .stagger-3 { transition-delay: 300ms; }

    /* SECTION: Hero */
    .hero-heading {
      font-size: clamp(3rem, 6vw, 5rem);
      max-width: 900px;
      margin-bottom: 2rem;
    }

    .hero-heading em {
      color: var(--primary);
      font-style: italic;
    }

    .hero-sub {
      font-size: 1.125rem;
      max-width: 600px;
      margin-bottom: 3rem;
      color: var(--text-body);
    }

    .initial-btn {
      display: flex;      
      gap: 1.5rem;         
      flex-wrap: wrap;  
    }

    .cta-btn {
      display: inline-flex;
      align-items: center;
      gap: 1rem;
      color: var(--text-heading);
      border: 1px solid var(--surface-hover);
      padding: 1rem 2rem;
      border-radius: 2px;
      transition: all var(--transition-med);
      background: transparent;
      cursor: pointer;
    }

    .cta-btn:hover {
      border-color: var(--primary);
      background: rgba(225, 29, 72, 0.05);
      transform: translateY(-2px);
    }

    /* SECTION: About */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1.5fr;
      gap: 4rem;
      align-items: start;
    }

    .section-title {
      font-size: 2.5rem;
      margin-bottom: 2rem;
    }

    .about-text p {
      font-size: 1.125rem;
      margin-bottom: 1.5rem;
    }

    /* SECTION: Skills */
    .skills-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 3rem;
      margin-top: 3rem;
    }

    .skill-cluster h3 {
      font-family: var(--font-mono);
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 1.5rem;
      letter-spacing: 0.05em;
      text-transform: uppercase;
    }

    .skill-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem;
    }

    .tag {
      background: var(--surface);
      border: 1px solid var(--surface-hover);
      padding: 0.5rem 1rem;
      border-radius: 2px;
      font-size: 0.9rem;
      color: var(--text-heading);
      transition: all var(--transition-fast);
    }

    .tag:hover {
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    /* SECTION: Projects */
    .projects-grid {
      display: grid;
      gap: 2rem;
      margin-top: 3rem;
    }

    .project-card {
      background: var(--surface);
      padding: 3rem;
      border-left: 2px solid transparent;
      transition: all var(--transition-med);
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
      text-decoration: none;
    }

    .project-card:hover {
      border-left-color: var(--primary);
      transform: translateX(8px);
      background: var(--surface-hover);
    }

    .project-header {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
    }

    .project-title {
      font-size: 2rem;
    }

    /* SECTION: Open Source */
    .os-card {
      background: var(--surface);
      padding: 3rem;
      border: 1px solid var(--surface-hover);
      margin-top: 3rem;
      max-width: 800px;
    }

    /* SECTION: Contact */
    .contact-wrapper {
      max-width: 600px;
    }

    .contact-heading {
      font-size: 3rem;
      margin-bottom: 1rem;
    }

    .social-links {
      display: flex;
      gap: 2rem;
      margin-top: 3rem;
    }

    .social-link {
      font-size: 1.125rem;
      color: var(--text-heading);
      border-bottom: 1px solid var(--surface-hover);
      padding-bottom: 0.25rem;
      transition: border-color var(--transition-med);
    }

    .social-link:hover {
      border-color: var(--primary);
    }

    /* Responsive */
    @media (max-width: 768px) {
      :root {
        --spine-left: 20px;
        --container-pl: 60px;
        --container-pr: 20px;
      }
      .about-grid {
        grid-template-columns: 1fr;
        gap: 2 rem;
      }
      .hero-heading {
        font-size: 2.5rem;
      }
      nav {
        justify-content: center;
        background: rgba(9, 9, 11, 0.9);
        padding: 1.5rem;
      }
      .section-num {
        display: none;
      }
      .project-card {
        padding: 1.5rem;
      }
    }