:root {
    --bg: #070d12;
    --surface: #0b151b;
    --panel: #101e25;
    --border: #20343d;
    --accent: #55e6ff;
    --accent2: #b5f36a;
    --accent3: #ff9278;
    --text: #cbd8dc;
    --text-dim: #81969d;
    --white: #f2f9fa;
    --mono: 'JetBrains Mono', monospace;
    --sans: 'Space Grotesk', sans-serif;
  }

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

  html { scroll-behavior: smooth; }

  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    overflow-x: hidden;
    cursor: auto;
  }

  /* Grid background */
  body::before {
    content: '';
    position: fixed; inset: 0; z-index: 0;
    background-image:
      linear-gradient(rgba(85,230,255,0.035) 1px, transparent 1px),
      linear-gradient(90deg, rgba(85,230,255,0.035) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
  }

  /* NAV */
  nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 20px 60px;
    background: rgba(7,13,18,0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
  }
  .nav-logo {
    font-family: var(--mono);
    font-size: 14px;
    color: var(--accent);
    letter-spacing: 2px;
    text-decoration: none;
  }
  .nav-links { display: flex; gap: 40px; list-style: none; }
  .nav-links a {
    font-family: var(--mono); font-size: 12px; letter-spacing: 1px;
    color: var(--text-dim); text-decoration: none; text-transform: uppercase;
    transition: color 0.2s;
  }
  .nav-links a:hover { color: var(--accent); }
  .nav-toggle { display: none; }

  .skip-link {
    position: fixed; top: 12px; left: 12px; z-index: 200;
    padding: 10px 14px; background: var(--accent); color: var(--bg);
    transform: translateY(-150%); text-decoration: none; font-family: var(--mono);
  }
  .skip-link:focus { transform: translateY(0); }
  :focus-visible { outline: 2px solid var(--accent2); outline-offset: 4px; }

  /* HERO */
  .hero {
    position: relative; min-height: 100vh;
    display: flex; align-items: center;
    padding: 120px 60px 60px;
    overflow: hidden;
  }
  .hero-bg-text {
    position: absolute; right: -20px; top: 50%;
    transform: translateY(-50%);
    font-family: var(--mono); font-size: clamp(100px, 18vw, 260px);
    color: rgba(85,230,255,0.035); font-weight: 700;
    white-space: nowrap; pointer-events: none; user-select: none;
    line-height: 1;
  }
  .hero-content { position: relative; z-index: 2; max-width: min(800px, calc(100% - 360px)); }
  .hero-photo {
    position: absolute; top: 46%; right: 7%; z-index: 1;
    width: clamp(190px, 26vw, 330px); height: clamp(190px, 26vw, 330px);
    object-fit: cover; object-position: center 42%;
    border: 2px solid rgba(85,230,255,0.65); border-radius: 50%;
    box-shadow: 0 0 0 10px rgba(85,230,255,0.06);
    transform: translateY(-50%);
  }
  .hero-tag {
    display: inline-flex; align-items: center; gap: 8px;
    font-family: var(--mono); font-size: 11px; letter-spacing: 3px;
    color: var(--accent); text-transform: uppercase;
    border: 1px solid rgba(85,230,255,0.3);
    padding: 6px 14px; border-radius: 2px;
    margin-bottom: 30px;
    animation: fadeInUp 0.8s ease both;
  }
  .hero-tag::before { content: ''; width: 6px; height: 6px; background: var(--accent); border-radius: 50%; animation: pulse 2s infinite; }
  .hero-name {
    font-family: var(--sans); font-size: clamp(48px, 8vw, 100px);
    font-weight: 800; line-height: 0.95;
    color: var(--white); letter-spacing: 0;
    animation: fadeInUp 0.8s 0.15s ease both;
  }
  .hero-name span { color: var(--accent); }
  .hero-title {
    font-family: var(--mono); font-size: clamp(14px, 2vw, 20px);
    color: var(--text-dim); margin-top: 20px;
    animation: fadeInUp 0.8s 0.3s ease both;
    letter-spacing: 1px;
  }
  .hero-title b { color: var(--accent2); font-weight: 400; }
  .hero-desc {
    max-width: 560px; margin-top: 30px; font-size: 16px;
    line-height: 1.8; color: var(--text);
    animation: fadeInUp 0.8s 0.45s ease both;
  }
  .hero-cta {
    display: flex; gap: 16px; margin-top: 50px; flex-wrap: wrap;
    animation: fadeInUp 0.8s 0.6s ease both;
  }
  .btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 28px; font-family: var(--mono); font-size: 12px;
    letter-spacing: 1px; text-transform: uppercase; text-decoration: none;
    border-radius: 2px; transition: all 0.25s; cursor: pointer;
  }
  .btn-primary {
    background: var(--accent); color: var(--bg);
    border: 1px solid var(--accent);
  }
  .btn-primary:hover { background: transparent; color: var(--accent); }
  .btn-ghost {
    background: transparent; color: var(--text);
    border: 1px solid var(--border);
  }
  .btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

  .hero-stats {
    position: absolute; right: 60px; bottom: 60px;
    display: flex; flex-direction: column; gap: 20px;
    animation: fadeInUp 0.8s 0.75s ease both;
  }
  .stat { text-align: right; }
  .stat-num {
    font-family: var(--mono); font-size: 36px; font-weight: 700;
    color: var(--white); line-height: 1;
  }
  .stat-num span { color: var(--accent); }
  .stat-label { font-size: 11px; letter-spacing: 2px; color: var(--text-dim); text-transform: uppercase; margin-top: 4px; }

  /* SECTIONS */
  section { position: relative; z-index: 1; padding: 100px 60px; }
  .skills-section { padding-top: 0; }
  .section-header { margin-bottom: 70px; }
  .section-num {
    font-family: var(--mono); font-size: 11px; letter-spacing: 3px;
    color: var(--accent); text-transform: uppercase; margin-bottom: 10px;
  }
  .section-title {
    font-size: clamp(36px, 5vw, 64px); font-weight: 800;
    color: var(--white); letter-spacing: 0; line-height: 1;
  }
  .section-line {
    width: 60px; height: 2px; background: var(--accent); margin-top: 20px;
  }

  /* ABOUT */
  .about-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start;
  }
  .about-text { font-size: 16px; line-height: 2; color: var(--text); }
  .about-text p { margin-bottom: 20px; }
  .about-text strong { color: var(--accent2); font-weight: 600; }
  .about-cards { display: flex; flex-direction: column; gap: 16px; }
  .about-card {
    background: var(--panel); border: 1px solid var(--border);
    border-left: 3px solid var(--accent); padding: 20px 24px;
    border-radius: 2px; transition: border-color 0.2s, transform 0.2s;
  }
  .about-card:hover { border-left-color: var(--accent2); transform: translateX(4px); }
  .about-card-title { font-family: var(--mono); font-size: 11px; letter-spacing: 2px; color: var(--accent); text-transform: uppercase; margin-bottom: 6px; }
  .about-card-val { font-size: 15px; color: var(--white); font-weight: 600; }

  /* SKILLS */
  .skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; }
  .skill-cat {
    background: var(--panel); border: 1px solid var(--border);
    padding: 36px; transition: background 0.2s;
  }
  .skill-cat:hover { background: #15262e; }
  .skill-cat-icon { font-size: 28px; margin-bottom: 16px; }
  .skill-cat-title {
    font-family: var(--mono); font-size: 12px; letter-spacing: 2px;
    color: var(--accent); text-transform: uppercase; margin-bottom: 20px;
  }
  .skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
  .skill-tag {
    font-family: var(--mono); font-size: 11px;
    padding: 4px 10px; border-radius: 2px;
    background: rgba(85,230,255,0.07); border: 1px solid rgba(85,230,255,0.15);
    color: var(--text); letter-spacing: 0.5px;
    transition: all 0.2s;
  }
  .skill-tag:hover { background: rgba(85,230,255,0.15); color: var(--accent); }

  /* PROJECTS */
  .projects-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; }
  .project-card {
    background: var(--panel); border: 1px solid var(--border);
    padding: 44px; position: relative; overflow: hidden;
    transition: all 0.3s; text-decoration: none; display: block;
    cursor: auto;
  }
  .project-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0; transition: opacity 0.3s;
  }
  .project-card:hover::before { opacity: 1; }
  .project-card:hover { background: #142731; transform: translateY(-2px); }
  .project-card.featured {
    grid-column: 1 / -1;
    display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start;
  }
  .project-badge {
    display: inline-block;
    font-family: var(--mono); font-size: 10px; letter-spacing: 2px;
    text-transform: uppercase; padding: 4px 10px; border-radius: 2px;
    background: rgba(85,230,255,0.1); border: 1px solid rgba(85,230,255,0.2);
    color: var(--accent); margin-bottom: 20px;
  }
  .project-badge.pfe { background: rgba(181,243,106,0.1); border-color: rgba(181,243,106,0.2); color: var(--accent2); }
  .project-badge.chu { background: rgba(255,146,120,0.1); border-color: rgba(255,146,120,0.2); color: var(--accent3); }
  .project-title {
    font-size: 28px; font-weight: 800; color: var(--white);
    letter-spacing: 0; margin-bottom: 14px; line-height: 1.1;
  }
  .project-desc { font-size: 14px; line-height: 1.9; color: var(--text); margin-bottom: 24px; }
  .project-stack { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 30px; }
  .tech-pill {
    font-family: var(--mono); font-size: 10px; letter-spacing: 1px;
    padding: 4px 10px; border-radius: 2px;
    background: var(--surface); border: 1px solid var(--border); color: var(--text-dim);
  }
  .project-features { list-style: none; }
  .project-features--spaced { margin-top: 20px; }
  .project-features li {
    font-family: var(--mono); font-size: 12px; color: var(--text-dim);
    padding: 8px 0; border-bottom: 1px solid var(--border);
    display: flex; align-items: center; gap: 10px;
  }
  .project-features li::before { content: '▸'; color: var(--accent); font-size: 10px; }
  .project-link {
    display: inline-flex; align-items: center; gap: 8px;
    font-family: var(--mono); font-size: 11px; letter-spacing: 1px;
    color: var(--accent); text-decoration: none;
    border-bottom: 1px solid rgba(85,230,255,0.3);
    padding-bottom: 2px; transition: all 0.2s;
    margin-top: 10px;
  }
  .project-link:hover { color: var(--white); border-color: var(--white); }
  .project-visual {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 4px; padding: 24px; font-family: var(--mono); font-size: 11px;
    color: var(--text-dim); line-height: 2;
  }
  .terminal-header {
    display: flex; align-items: center; gap: 8px; margin-bottom: 20px;
    padding-bottom: 14px; border-bottom: 1px solid var(--border);
  }
  .terminal-dot { width: 10px; height: 10px; border-radius: 50%; }
  .terminal-dot--red { background: #ff7168; }
  .terminal-dot--amber { background: #ffc857; }
  .terminal-dot--green { background: var(--accent2); }
  .terminal-name { margin-left: 10px; color: var(--text-dim); }
  .terminal-line { color: var(--text-dim); }
  .terminal-line--success { color: var(--accent2); }
  .terminal-line--muted { color: var(--text-dim); }
  .terminal-line .cmd { color: var(--accent2); }
  .terminal-line .val { color: var(--accent); }
  .terminal-line .cmt { color: #3a4a5a; }
  .terminal-line .warn { color: var(--accent3); }

  /* EXPERIENCE TIMELINE */
  .timeline { position: relative; padding-left: 40px; }
  .timeline::before {
    content: '';
    position: absolute; left: 0; top: 10px; bottom: 10px;
    width: 1px; background: var(--border);
  }
  .timeline-item { position: relative; margin-bottom: 60px; }
  .timeline-dot {
    position: absolute; left: -46px; top: 6px;
    width: 12px; height: 12px; border-radius: 50%;
    background: var(--bg); border: 2px solid var(--accent);
    transition: background 0.2s;
  }
  .timeline-item:hover .timeline-dot { background: var(--accent); }
  .timeline-period {
    font-family: var(--mono); font-size: 11px; letter-spacing: 2px;
    color: var(--text-dim); text-transform: uppercase; margin-bottom: 8px;
  }
  .timeline-role {
    font-size: 22px; font-weight: 700; color: var(--white);
    letter-spacing: 0; margin-bottom: 4px;
  }
  .timeline-org { font-family: var(--mono); font-size: 13px; color: var(--accent); margin-bottom: 20px; }
  .timeline-tasks { list-style: none; }
  .timeline-tasks li {
    font-size: 14px; color: var(--text); padding: 6px 0;
    padding-left: 18px; position: relative; line-height: 1.6;
  }
  .timeline-tasks li::before {
    content: '─';
    position: absolute; left: 0; color: var(--accent2);
  }

  /* EDUCATION */
  .edu-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; }
  .edu-card {
    background: var(--panel); border: 1px solid var(--border);
    padding: 36px; position: relative; overflow: hidden;
  }
  .edu-year {
    font-family: var(--mono); font-size: 48px; font-weight: 700;
    color: rgba(85,230,255,0.06); position: absolute; right: 20px; bottom: 20px;
    line-height: 1;
  }
  .edu-level {
    font-family: var(--mono); font-size: 11px; letter-spacing: 2px;
    color: var(--accent2); text-transform: uppercase; margin-bottom: 12px;
  }
  .edu-title {
    font-size: 18px; font-weight: 700; color: var(--white); margin-bottom: 8px;
    letter-spacing: 0;
  }
  .edu-school { font-size: 13px; color: var(--text-dim); line-height: 1.5; }

  /* CERTIFICATIONS */
  .certs-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .certifications { margin-top: 60px; }
  .subsection-title { font-size: 22px; color: var(--white); font-weight: 700; margin-bottom: 30px; }
  .cert-item {
    display: flex; align-items: center; gap: 16px;
    background: var(--panel); border: 1px solid var(--border);
    padding: 16px 20px; border-radius: 2px;
    transition: all 0.2s;
  }
  .cert-item:hover { border-color: var(--accent); }
  .cert-icon {
    width: 36px; height: 36px; border-radius: 50%;
    background: rgba(85,230,255,0.1); border: 1px solid rgba(85,230,255,0.2);
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; flex-shrink: 0;
  }
  .cert-name { font-size: 13px; color: var(--white); font-weight: 600; margin-bottom: 3px; }
  .cert-issuer { font-family: var(--mono); font-size: 10px; color: var(--text-dim); letter-spacing: 1px; }

  /* CONTACT */
  .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
  .contact-info { display: flex; flex-direction: column; gap: 20px; }
  .contact-item {
    display: flex; align-items: center; gap: 16px;
    padding: 20px; background: var(--panel); border: 1px solid var(--border);
    text-decoration: none; transition: all 0.2s; border-radius: 2px;
  }
  .contact-item:hover { border-color: var(--accent); }
  .contact-icon { font-size: 20px; width: 44px; text-align: center; }
  .contact-label { font-family: var(--mono); font-size: 10px; letter-spacing: 2px; color: var(--text-dim); text-transform: uppercase; margin-bottom: 4px; }
  .contact-val { font-size: 14px; color: var(--white); font-weight: 600; }
  .contact-message {
    font-size: 40px; font-weight: 800; color: var(--white);
    letter-spacing: 0; line-height: 1.1; margin-bottom: 20px;
  }
  .contact-message span { color: var(--accent); }
  .contact-sub { font-size: 15px; color: var(--text); line-height: 1.8; margin-bottom: 30px; }

  /* FOOTER */
  footer {
    border-top: 1px solid var(--border);
    padding: 30px 60px;
    display: flex; justify-content: space-between; align-items: center;
    font-family: var(--mono); font-size: 11px; color: var(--text-dim);
  }
  footer span { color: var(--accent); }

  /* ANIMATIONS */
  @keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
  }
  @keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
  }
  @keyframes scanline {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(100vh); }
  }

  .reveal {
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .js .reveal { opacity: 0; transform: translateY(40px); }
  .js .reveal.visible { opacity: 1; transform: translateY(0); }

  @media (max-width: 900px) {
    nav { padding: 16px 24px; }
    .nav-toggle {
      display: flex; flex-direction: column; justify-content: center; gap: 5px;
      width: 44px; height: 44px; padding: 10px; border: 1px solid var(--border);
      background: var(--panel); cursor: pointer;
    }
    .nav-toggle span { width: 100%; height: 2px; background: var(--accent); }
    .nav-links {
      position: absolute; top: 100%; right: 24px; left: 24px;
      display: none; flex-direction: column; gap: 0; padding: 8px 16px;
      background: var(--surface); border: 1px solid var(--border);
    }
    .nav-links.is-open { display: flex; }
    .nav-links a { display: block; padding: 13px 4px; }
    section, .hero { padding: 80px 24px; }
    .hero { flex-direction: column; align-items: flex-start; }
    .hero-photo {
      position: relative; top: auto; right: auto; transform: none;
      width: clamp(150px, 42vw, 220px); height: clamp(150px, 42vw, 220px);
      margin: 0 auto 32px;
    }
    .hero-content { width: 100%; max-width: 800px; }
    .hero-stats { display: none; }
    .about-grid, .contact-grid { grid-template-columns: 1fr; }
    .skills-grid, .edu-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
    .project-card.featured { grid-template-columns: 1fr; }
    .certs-grid { grid-template-columns: 1fr; }
    footer { flex-direction: column; gap: 10px; text-align: center; }
    .cursor, .cursor-ring { display: none; }
  }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
    .reveal { opacity: 1; transform: none; }
  }