:root,
  :root[data-theme="dark"] {
    --bg: #080b10;
    --bg2: #0e1420;
    --surface: #131926;
    --accent: #00e5a0;
    --accent2: #0af;
    --accent-hover: #00ffb3;
    --text: #e8edf5;
    --muted: #6b7a95;
    --border: #1e2d42;
    --glow: rgba(0,229,160,0.18);
    --accent-05: rgba(0,229,160,0.05);
    --accent-08: rgba(0,229,160,0.08);
    --accent-10: rgba(0,229,160,0.10);
    --accent-12: rgba(0,229,160,0.12);
    --accent-15: rgba(0,229,160,0.15);
    --accent-20: rgba(0,229,160,0.20);
    --accent-25: rgba(0,229,160,0.25);
    --accent-30: rgba(0,229,160,0.30);
    --accent2-10: rgba(0,170,255,0.10);
    --nav-bg: rgba(8,11,16,0.85);
    --mobile-nav-bg: rgba(8,11,16,0.97);
    --tag-bg: rgba(255,255,255,0.05);
    --shadow-color: rgba(0,0,0,0.4);
    --noise-opacity: 0.025;
    --grid-opacity: 0.3;
  }

  :root[data-theme="light"] {
    --bg: #f4f6f9;
    --bg2: #e9edf3;
    --surface: #ffffff;
    --accent: #00a97a;
    --accent2: #0077cc;
    --accent-hover: #00c690;
    --text: #10151f;
    --muted: #59667a;
    --border: #d7dee8;
    --glow: rgba(0,169,122,0.18);
    --accent-05: rgba(0,169,122,0.05);
    --accent-08: rgba(0,169,122,0.08);
    --accent-10: rgba(0,169,122,0.10);
    --accent-12: rgba(0,169,122,0.10);
    --accent-15: rgba(0,169,122,0.15);
    --accent-20: rgba(0,169,122,0.18);
    --accent-25: rgba(0,169,122,0.22);
    --accent-30: rgba(0,169,122,0.28);
    --accent2-10: rgba(0,119,204,0.08);
    --nav-bg: rgba(244,246,249,0.85);
    --mobile-nav-bg: rgba(244,246,249,0.97);
    --tag-bg: rgba(16,21,31,0.04);
    --shadow-color: rgba(30,45,66,0.12);
    --noise-opacity: 0.02;
    --grid-opacity: 0.15;
  }

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

  html { scroll-behavior: smooth; }

  a:focus-visible,
  button:focus-visible,
  input:focus-visible,
  textarea:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 3px;
  }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }
  }

  /* Theme switch transition */
  body, nav, .mobile-nav, .skill-card, .project-card, .cert-card, .tag,
  .contact-link, .contact-form-side, .form-group input, .form-group textarea,
  .divider, .back-to-top {
    transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
  }

  /* Scroll progress */
  .scroll-progress {
    position: fixed;
    top: 0; left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    z-index: 200;
    transition: width 0.1s ease-out;
  }

  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'DM Mono', monospace;
    font-size: 15px;
    line-height: 1.7;
    overflow-x: hidden;
  }

  /* Noise overlay */
  body::before {
    content: '';
    position: fixed; inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
    opacity: var(--noise-opacity);
    pointer-events: none;
    z-index: 9999;
  }

  /* Animated grid background */
  .grid-bg {
    position: fixed; inset: 0;
    background-image:
      linear-gradient(var(--border) 1px, transparent 1px),
      linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: var(--grid-opacity);
    pointer-events: none;
    z-index: 0;
  }

  /* Nav */
  nav {
    position: fixed; top: 0; left: 0; right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 3rem;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
  }

  .nav-logo {
    font-family: 'Syne', sans-serif;
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--accent);
    letter-spacing: -0.02em;
    text-decoration: none;
  }

  .nav-links { display: flex; gap: 2.5rem; list-style: none; }
  .nav-links a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    transition: color 0.2s;
  }
  .nav-links a:hover, .nav-links a.active { color: var(--accent); }

  .nav-cta {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent) !important;
    padding: 0.45rem 1.2rem;
    border-radius: 3px;
    transition: background 0.2s, color 0.2s !important;
  }
  .nav-cta:hover { background: var(--accent); color: var(--bg) !important; }

  /* Theme toggle */
  .theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 100px;
    padding: 0.4rem 0.6rem;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    font-size: 0.95rem;
    line-height: 1;
  }
  .theme-toggle:hover { border-color: var(--accent); }
  .theme-icon-moon { display: none; }
  :root[data-theme="light"] .theme-icon-sun { display: none; }
  :root[data-theme="light"] .theme-icon-moon { display: inline; }
  .theme-toggle-mobile { width: 100%; justify-content: flex-start; margin-top: 0.5rem; }
  .theme-toggle-label {
    font-size: 0.78rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
  }

  /* Hamburger */
  .hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    background: none;
    border: none;
  }
  .hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s;
  }
  .hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .hamburger.open span:nth-child(2) { opacity: 0; }
  .hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* Mobile nav */
  .mobile-nav {
    display: none;
    position: fixed;
    top: 60px; left: 0; right: 0;
    background: var(--mobile-nav-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 2rem;
    z-index: 99;
    flex-direction: column;
    gap: 1.2rem;
  }
  .mobile-nav.open { display: flex; }
  .mobile-nav a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    transition: color 0.2s;
  }
  .mobile-nav a:hover, .mobile-nav a.active { color: var(--accent); }

  /* Hero */
  .hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 0 3rem;
    z-index: 1;
    overflow: hidden;
  }

  .hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
  }
  .hero-orb-1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, var(--accent-15) 0%, transparent 70%);
    top: -100px; right: -100px;
    animation: float 8s ease-in-out infinite;
  }
  .hero-orb-2 {
    width: 350px; height: 350px;
    background: radial-gradient(circle, var(--accent2-10) 0%, transparent 70%);
    bottom: 0; left: 10%;
    animation: float 10s ease-in-out infinite reverse;
  }

  @keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-30px); }
  }

  .hero-content {
    max-width: 900px;
    animation: fadeUp 0.9s ease forwards;
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent-08);
    border: 1px solid var(--accent-25);
    color: var(--accent);
    font-size: 0.72rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    padding: 0.4rem 1rem;
    border-radius: 100px;
    margin-bottom: 2rem;
  }
  .hero-badge::before {
    content: '';
    width: 6px; height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
  }
  @keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.7); }
  }

  .hero h1 {
    font-family: 'Syne', sans-serif;
    font-size: clamp(3rem, 8vw, 7rem);
    font-weight: 800;
    line-height: 0.95;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
  }

  .hero h1 .name-line { display: block; }
  .hero h1 .accent-word { color: var(--accent); }

  .cursor-blink {
    color: var(--accent);
    animation: blink 1.1s step-end infinite;
  }
  @keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

  .hero-desc {
    font-family: 'DM Mono', monospace;
    font-size: 0.95rem;
    color: var(--muted);
    max-width: 520px;
    margin-bottom: 2.5rem;
    line-height: 1.8;
  }

  .hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

  .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.8rem;
    font-family: 'DM Mono', monospace;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.25s;
    cursor: pointer;
    border: none;
  }

  .btn-primary {
    background: var(--accent);
    color: var(--bg);
    font-weight: 400;
  }
  .btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-30);
  }

  .btn-outline {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
  }
  .btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
  }

  .hero-stats {
    display: flex;
    gap: 3rem;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
  }
  .stat-item {}
  .stat-num {
    font-family: 'Syne', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
  }
  .stat-label {
    font-size: 0.72rem;
    color: var(--muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
  }

  /* Sections */
  section {
    position: relative;
    z-index: 1;
    padding: 7rem 3rem;
    max-width: 1100px;
    margin: 0 auto;
  }

  .section-tag {
    display: inline-block;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
  }

  .section-title {
    font-family: 'Syne', sans-serif;
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: 1rem;
  }

  .section-sub {
    color: var(--muted);
    font-size: 0.9rem;
    max-width: 500px;
    margin-bottom: 3.5rem;
  }

  /* Divider */
  .divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
    margin: 0 auto;
  }

  /* Skills */
  .skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
  }

  .skill-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.8rem;
    transition: border-color 0.3s, transform 0.3s;
    position: relative;
    overflow: hidden;
  }
  .skill-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 100%;
    background: var(--accent);
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 0.3s;
  }
  .skill-card:hover { border-color: var(--accent-30); transform: translateY(-4px); }
  .skill-card:hover::before { transform: scaleY(1); }

  .skill-cat {
    font-size: 0.68rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1rem;
  }

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

  .tag {
    background: var(--tag-bg);
    border: 1px solid var(--border);
    color: var(--text);
    font-size: 0.75rem;
    padding: 0.3rem 0.75rem;
    border-radius: 3px;
    font-family: 'DM Mono', monospace;
  }

  /* Projects */
  .projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
  }

  .project-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 2rem;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }

  .project-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--mx, 50%) var(--my, 50%), var(--accent-05), transparent 60%);
    opacity: 0;
    transition: opacity 0.4s;
  }
  .project-card:hover::after { opacity: 1; }
  .project-card:hover { border-color: var(--accent-30); transform: translateY(-6px); box-shadow: 0 20px 60px var(--shadow-color); }

  .proj-num {
    font-family: 'Instrument Serif', serif;
    font-size: 3rem;
    color: var(--accent-12);
    line-height: 1;
    margin-bottom: 1rem;
  }

  .proj-title {
    font-family: 'Syne', sans-serif;
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
  }

  .proj-desc {
    font-size: 0.82rem;
    color: var(--muted);
    line-height: 1.7;
    flex: 1;
    margin-bottom: 1.5rem;
  }

  .proj-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1.5rem;
  }
  .proj-tag {
    background: var(--accent-08);
    border: 1px solid var(--accent-20);
    color: var(--accent);
    font-size: 0.68rem;
    padding: 0.25rem 0.65rem;
    border-radius: 3px;
    letter-spacing: 0.05em;
  }

  .proj-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.72rem;
    color: var(--muted);
    border-top: 1px solid var(--border);
    padding-top: 1rem;
  }

  /* Experience */
  .exp-timeline { position: relative; }
  .exp-timeline::before {
    content: '';
    position: absolute;
    left: 12px; top: 0; bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, var(--accent), transparent);
  }

  .exp-item {
    display: flex;
    gap: 2rem;
    margin-bottom: 3rem;
    padding-left: 0;
    animation: fadeUp 0.6s ease both;
  }

  .exp-dot {
    width: 25px;
    height: 25px;
    min-width: 25px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 0.2rem;
    box-shadow: 0 0 12px var(--glow);
  }
  .exp-dot::after {
    content: '';
    width: 7px; height: 7px;
    background: var(--accent);
    border-radius: 50%;
  }

  .exp-body { flex: 1; }

  .exp-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.4rem;
    flex-wrap: wrap;
  }

  .exp-role {
    font-family: 'Syne', sans-serif;
    font-weight: 700;
    font-size: 1.05rem;
  }

  .exp-period {
    font-size: 0.72rem;
    color: var(--accent);
    background: var(--accent-08);
    border: 1px solid var(--accent-20);
    padding: 0.2rem 0.65rem;
    border-radius: 100px;
    letter-spacing: 0.05em;
  }

  .exp-company { color: var(--muted); font-size: 0.82rem; margin-bottom: 1rem; }

  .exp-bullets { list-style: none; }
  .exp-bullets li {
    position: relative;
    padding-left: 1.2rem;
    margin-bottom: 0.4rem;
    font-size: 0.83rem;
    color: var(--muted);
  }
  .exp-bullets li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
  }

  /* Certifications */
  .certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
  }

  .cert-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: all 0.25s;
  }
  .cert-card:hover { border-color: var(--accent-30); transform: translateX(4px); }

  .cert-icon {
    width: 40px; height: 40px; min-width: 40px;
    background: var(--accent-10);
    border: 1px solid var(--accent-20);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
  }

  .cert-name { font-family: 'Syne', sans-serif; font-size: 0.9rem; font-weight: 600; margin-bottom: 0.25rem; }
  .cert-org { font-size: 0.72rem; color: var(--muted); }
  .cert-year { font-size: 0.68rem; color: var(--accent); margin-top: 0.4rem; letter-spacing: 0.08em; }

  /* Contact */
  .contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
  }

  .contact-info { }

  .contact-links { display: flex; flex-direction: column; gap: 1rem; margin-top: 2rem; }

  .contact-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    text-decoration: none;
    color: var(--text);
    font-size: 0.82rem;
    transition: all 0.25s;
  }
  .contact-link:hover { border-color: var(--accent); color: var(--accent); transform: translateX(6px); }

  .contact-icon {
    width: 36px; height: 36px;
    background: var(--accent-08);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
  }

  .contact-form-side {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 2rem;
  }

  .form-title { font-family: 'Syne', sans-serif; font-size: 1.1rem; font-weight: 700; margin-bottom: 1.5rem; }

  .form-group { margin-bottom: 1.2rem; }
  .form-group label { display: block; font-size: 0.72rem; color: var(--muted); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.5rem; }
  .form-group input,
  .form-group textarea {
    width: 100%;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 5px;
    color: var(--text);
    font-family: 'DM Mono', monospace;
    font-size: 0.85rem;
    padding: 0.7rem 1rem;
    outline: none;
    transition: border-color 0.2s;
    resize: vertical;
  }
  .form-group input:focus,
  .form-group textarea:focus { border-color: var(--accent); }
  .form-group textarea { min-height: 100px; }

  .form-submit {
    width: 100%;
    background: var(--accent);
    color: var(--bg);
    border: none;
    border-radius: 5px;
    padding: 0.85rem;
    font-family: 'DM Mono', monospace;
    font-size: 0.82rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.25s;
  }
  .form-submit:hover { background: var(--accent-hover); box-shadow: 0 6px 20px var(--accent-30); }

  /* Back to top */
  .back-to-top {
    position: fixed;
    bottom: 2rem; right: 2rem;
    width: 44px; height: 44px;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s, transform 0.3s, border-color 0.25s, background 0.25s;
    z-index: 90;
  }
  .back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
  .back-to-top:hover { border-color: var(--accent); background: var(--accent-08); transform: translateY(-3px); }

  /* Footer */
  footer {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--border);
    padding: 2rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
  }

  .footer-logo {
    font-family: 'Syne', sans-serif;
    font-weight: 800;
    color: var(--accent);
  }

  .footer-copy { font-size: 0.75rem; color: var(--muted); }

  /* Scroll reveal */
  .reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .reveal.visible { opacity: 1; transform: translateY(0); }

  /* Responsive */
  @media (max-width: 900px) {
    nav { padding: 1rem 1.5rem; }
    .nav-links { display: none; }
    .theme-toggle:not(.theme-toggle-mobile) { display: none; }
    .hamburger { display: flex; }
    .hero { padding: 0 1.5rem; }
    section { padding: 5rem 1.5rem; }
    footer { padding: 1.5rem; }
    .contact-wrapper { grid-template-columns: 1fr; gap: 2rem; }
    .hero-stats { gap: 1.5rem; }
  }

  @media (max-width: 600px) {
    .hero h1 { font-size: 2.8rem; }
    .hero-stats { flex-wrap: wrap; }
    .projects-grid { grid-template-columns: 1fr; }
    .skills-grid { grid-template-columns: 1fr; }
    .certs-grid { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; }
    .btn { justify-content: center; }
  }