*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  :root {
    --bg-page: #F2F3F5; --bg-section-alt: #EAEBEE; --bg-card: #FFFFFF;
    --bmw-blue: #243C73; --bmw-blue-light: #34579E;
    --bmw-red: #5A2D87; --bmw-red-light: #7A45B8;
    --white: #FFFFFF; --text-primary: #101A33; --text-muted: #5A6478;
    --border: rgba(36,60,115,0.13); --border-strong: rgba(36,60,115,0.25);
  }
  html { scroll-behavior: smooth; }
  body { font-family: 'DM Sans', sans-serif; background: var(--bg-page); color: var(--text-primary); font-size: 15px; line-height: 1.7; overflow-x: hidden; }

  nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; display: flex; align-items: center; justify-content: space-between; padding: 1rem 3rem; background: rgba(255,255,255,0.92); backdrop-filter: blur(12px); border-bottom: 0.5px solid var(--border-strong); }
  .nav-logo { font-family: 'Cormorant Garamond', serif; font-size: 1.5rem; font-weight: 600; color: var(--bmw-blue); letter-spacing: 0.06em; }
  .nav-links { display: flex; gap: 2rem; list-style: none; }
  .nav-links a { color: var(--text-muted); text-decoration: none; font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 500; transition: color 0.2s; }
  .nav-links a:hover { color: var(--bmw-blue); }

  .hero { min-height: 100vh; display: flex; align-items: center; padding: 0 3rem; position: relative; overflow: hidden; background: var(--bmw-blue); }
  .hero-stripe { position: absolute; top: 0; bottom: 0; right: 0; width: 38%; background: var(--white); clip-path: polygon(12% 0, 100% 0, 100% 100%, 0% 100%); }
  .hero-stripe-accent { position: absolute; top: 0; bottom: 0; right: 38%; width: 6px; background: var(--bmw-red); }
  .hero-content { max-width: 600px; position: relative; z-index: 2; }
  .hero-eyebrow { font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase; color: rgba(255,255,255,0.6); font-weight: 500; margin-bottom: 1.2rem; opacity: 0; animation: fadeUp 0.6s 0.2s forwards; }
  .hero-name { font-family: 'Cormorant Garamond', serif; font-size: clamp(3rem, 6vw, 5rem); font-weight: 300; line-height: 1.05; color: var(--white); margin-bottom: 0.3rem; opacity: 0; animation: fadeUp 0.6s 0.35s forwards; }
  .hero-name span { color: var(--bmw-red); font-weight: 500; }
  .hero-title { font-family: 'Cormorant Garamond', serif; font-size: 1.3rem; font-weight: 400; color: rgba(255,255,255,0.65); margin-bottom: 1.8rem; font-style: italic; opacity: 0; animation: fadeUp 0.6s 0.5s forwards; }
  .hero-desc { font-size: 15px; color: rgba(255,255,255,0.7); max-width: 460px; margin-bottom: 2.5rem; line-height: 1.85; opacity: 0; animation: fadeUp 0.6s 0.65s forwards; }
  .hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; opacity: 0; animation: fadeUp 0.6s 0.8s forwards; }
  .btn-primary { padding: 0.75rem 1.8rem; background: var(--bmw-red); color: var(--white); font-size: 13px; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; text-decoration: none; border: none; cursor: pointer; transition: background 0.2s, transform 0.15s; }
  .btn-primary:hover { background: var(--bmw-red-light); transform: translateY(-1px); }
  .btn-outline { padding: 0.75rem 1.8rem; background: transparent; color: rgba(255,255,255,0.75); font-size: 13px; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; text-decoration: none; border: 0.5px solid rgba(255,255,255,0.3); cursor: pointer; transition: color 0.2s, border-color 0.2s, transform 0.15s; }
  .btn-outline:hover { color: var(--white); border-color: rgba(255,255,255,0.7); transform: translateY(-1px); }

  section { padding: 6rem 3rem; }
  .section-label { font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--bmw-red); font-weight: 500; margin-bottom: 0.6rem; }
  .section-title { font-family: 'Cormorant Garamond', serif; font-size: clamp(2rem, 4vw, 3rem); font-weight: 400; color: var(--bmw-blue); margin-bottom: 3rem; line-height: 1.15; }
  .divider { width: 100%; height: 1px; background: linear-gradient(to right, var(--bmw-red) 60px, var(--border) 60px); margin-bottom: 4rem; }

  #about { background: var(--white); }
  .about-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 5rem; align-items: start; }
  .about-stats { display: flex; flex-direction: column; gap: 2rem; }
  .stat-item { border-left: 3px solid var(--bmw-blue); padding-left: 1.25rem; }
  .stat-num { font-family: 'Cormorant Garamond', serif; font-size: 1.8rem; font-weight: 500; color: var(--bmw-blue); line-height: 1; margin-bottom: 0.2rem; }
  .stat-label { font-size: 13px; color: var(--text-muted); }
  .about-text p { color: var(--text-muted); margin-bottom: 1.2rem; font-size: 15px; line-height: 1.85; }
  .tag-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.5rem; }
  .tag { padding: 0.3rem 0.85rem; border: 0.5px solid var(--border-strong); font-size: 12px; color: var(--bmw-blue); letter-spacing: 0.05em; background: var(--bg-page); }

  #experience { background: var(--bg-section-alt); }
  .timeline { display: flex; flex-direction: column; }
  .timeline-item { display: grid; grid-template-columns: 200px 1fr; gap: 2rem; padding: 2rem 0; border-bottom: 0.5px solid var(--border-strong); }
  .timeline-item:first-child { border-top: 0.5px solid var(--border-strong); }
  .timeline-date { font-size: 13px; color: var(--text-muted); padding-top: 0.2rem; }
  .timeline-role { font-family: 'Cormorant Garamond', serif; font-size: 1.15rem; font-weight: 500; color: var(--bmw-blue); margin-bottom: 0.2rem; }
  .timeline-org { font-size: 13px; color: var(--bmw-red); margin-bottom: 0.7rem; }
  .timeline-desc { font-size: 14px; color: var(--text-muted); line-height: 1.75; }
  .timeline-bullets { list-style: none; margin-top: 0.5rem; display: flex; flex-direction: column; gap: 0.4rem; }
  .timeline-bullets li { font-size: 14px; color: var(--text-muted); line-height: 1.7; padding-left: 1rem; position: relative; }
  .timeline-bullets li::before { content: '–'; position: absolute; left: 0; color: var(--bmw-red); }
  .badge { display: inline-block; font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; padding: 0.2rem 0.6rem; border: 0.5px solid var(--bmw-blue); color: var(--bmw-blue); margin-bottom: 0.6rem; margin-right: 0.4rem; background: rgba(36,60,115,0.05); }

  #projects { background: var(--white); }
  .projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; }
  .project-card { background: var(--bg-page); border: 0.5px solid var(--border-strong); border-top: 3px solid var(--bmw-blue); padding: 2rem; transition: border-top-color 0.2s, transform 0.2s, box-shadow 0.2s; cursor: pointer; }
  .project-card:hover { border-top-color: var(--bmw-red); transform: translateY(-3px); box-shadow: 0 8px 24px rgba(36,60,115,0.08); }
  .project-tag { font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--bmw-red); margin-bottom: 0.8rem; }
  .project-name { font-family: 'Cormorant Garamond', serif; font-size: 1.3rem; font-weight: 500; color: var(--bmw-blue); margin-bottom: 0.7rem; }
  .project-desc { font-size: 13.5px; color: var(--text-muted); line-height: 1.75; }
  .project-link { display: inline-block; margin-top: 1rem; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--bmw-blue); text-decoration: none; border-bottom: 1px solid var(--bmw-blue); padding-bottom: 2px; transition: color 0.2s, border-color 0.2s; }
  .project-link:hover { color: var(--bmw-red); border-color: var(--bmw-red); }

  #certifications { background: var(--bg-section-alt); }
  .certs-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.25rem; }
  .cert-card { background: var(--white); border: 0.5px solid var(--border-strong); border-left: 3px solid var(--bmw-red); overflow: hidden; display: flex; flex-direction: column; transition: transform 0.2s, box-shadow 0.2s; }
  .cert-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(36,60,115,0.10); }
  .cert-thumb { display: block; background: var(--bg-section-alt); border-bottom: 0.5px solid var(--border); overflow: hidden; }
  .cert-thumb img { display: block; width: 100%; height: 200px; object-fit: cover; object-position: top center; transition: transform 0.3s; }
  .cert-thumb:hover img { transform: scale(1.03); }
  .cert-body { padding: 1.25rem 1.5rem; }
  .cert-name { font-size: 14px; font-weight: 500; color: var(--bmw-blue); margin-bottom: 0.25rem; }
  .cert-issuer { font-size: 13px; color: var(--text-muted); }

  #contact { background: var(--bmw-blue); text-align: center; }
  .contact-inner { max-width: 500px; margin: 0 auto; }
  .contact-inner .section-label { color: rgba(255,255,255,0.5); }
  .contact-inner .section-title { color: var(--white); }
  .contact-email { font-family: 'Cormorant Garamond', serif; font-size: 1.5rem; color: rgba(255,255,255,0.85); text-decoration: none; display: block; margin: 1.5rem 0 2.5rem; transition: color 0.2s; }
  .contact-email:hover { color: var(--white); }
  .contact-inner p { color: rgba(255,255,255,0.6); }
  .social-row { display: flex; justify-content: center; gap: 1.5rem; flex-wrap: wrap; }
  .social-link { font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(255,255,255,0.55); text-decoration: none; transition: color 0.2s; border-bottom: 0.5px solid rgba(255,255,255,0.2); padding-bottom: 2px; }
  .social-link:hover { color: var(--white); border-bottom-color: var(--white); }

  footer { padding: 2rem 3rem; background: #141026; display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: rgba(255,255,255,0.3); }

  @keyframes fadeUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }

  /* ── Mobile Navigation ── */
  .nav-hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; background: none; border: none; }
  .nav-hamburger span { display: block; width: 22px; height: 2px; background: var(--bmw-blue); transition: transform 0.3s, opacity 0.3s; }
  .nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-hamburger.open span:nth-child(2) { opacity: 0; }
  .nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* ── Responsive Breakpoints ── */
  @media (max-width: 768px) {
    nav { padding: 1rem 1.25rem; }
    .nav-hamburger { display: flex; }
    .nav-links {
      display: none; flex-direction: column; gap: 0;
      position: fixed; top: 57px; left: 0; right: 0;
      background: rgba(255,255,255,0.97); backdrop-filter: blur(12px);
      border-bottom: 0.5px solid var(--border-strong);
      padding: 0.5rem 0 1rem; z-index: 99;
    }
    .nav-links.open { display: flex; }
    .nav-links li a { display: block; padding: 0.75rem 1.5rem; font-size: 13px; }

    .hero { padding: 6rem 1.5rem 4rem; }
    .hero-stripe { width: 0; }
    .hero-stripe-accent { display: none; }
    .hero-content { max-width: 100%; }
    .hero-name { font-size: clamp(2.4rem, 10vw, 3.5rem); }
    .hero-title { font-size: 1.1rem; }
    .hero-desc { font-size: 14px; max-width: 100%; }
    .hero-cta { flex-direction: column; gap: 0.75rem; }
    .btn-primary, .btn-outline { text-align: center; }

    section { padding: 4rem 1.5rem; }

    .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }

    .timeline-item { grid-template-columns: 1fr; gap: 0.5rem; }
    .timeline-date { font-size: 12px; color: var(--bmw-red); padding-top: 0; }

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

    footer { flex-direction: column; gap: 0.5rem; text-align: center; padding: 1.5rem 1.25rem; }

    .section-title { font-size: clamp(1.75rem, 6vw, 2.5rem); margin-bottom: 2rem; }
    .social-row { gap: 1rem; }
    .contact-email { font-size: 1.2rem; }
  }

  @media (max-width: 400px) {
    .hero-name { font-size: 2.2rem; }
    section { padding: 3rem 1.25rem; }
    .tag-row { gap: 0.4rem; }
    .tag { font-size: 11px; }
  }