/* ===========================
   Responsive
   =========================== */

/* Tablet */
@media (max-width: 1024px) {
  .nav-links { gap: 1.5rem; }
  .profile-grid { gap: 3rem; }
  .about-grid { grid-template-columns: 1fr; gap: 3rem; }
  .tl-item { grid-template-columns: 140px 1fr; gap: 2rem; }
  .project-row { grid-template-columns: 200px 1fr; gap: 2rem; }
  .skill-group { grid-template-columns: 160px 1fr; gap: 2rem; }
}

/* Mobile */
@media (max-width: 768px) {
  #desktop-nav { display: none; }
  #hamburger-nav {
    display: flex;
    position: sticky;
    top: 0;
    height: 64px;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--pad-x);
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--rule-soft);
    z-index: 100;
  }

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

  /* Hero */
  .profile-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .profile-photo {
    order: -1;
    max-width: 280px;
    margin: 0;
    aspect-ratio: 1 / 1;
  }
  .hero-title { font-size: clamp(2.5rem, 12vw, 4rem); }
  .hero-tagline { max-width: 100%; }
  .btn { flex: 1 1 auto; justify-content: center; }

  /* About */
  .education-block { grid-template-columns: 1fr; gap: 2rem; }
  .about-meta { border-top: none; padding-top: 0; }

  /* Timeline */
  .tl-item {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 2rem 0;
  }
  .tl-period { padding-top: 0; }
  .tl-body h3 { font-size: 1.25rem; }
  .tl-body h3 .muted { display: block; font-size: 0.85rem; margin-top: 0.25rem; }

  /* Projects */
  .project-row {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    padding: 2.5rem 0;
  }
  .project-meta h3 { font-size: 1.5rem; }
  .row-arrow { top: 2.5rem; }
  .earlier-list a {
    grid-template-columns: 1fr auto;
    gap: 0.5rem;
  }
  .earlier-list a > span:nth-child(2) { grid-column: 1 / -1; font-size: 0.9rem; }

  /* Skills */
  .skill-group {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding: 1.5rem 0;
  }

  /* Research */
  .research-list a { padding-right: 3.5rem; }
  .research-list h3 { font-size: 1.1rem; }

  /* Contact */
  .contact-email { font-size: 1.75rem; }
  .contact-links a {
    grid-template-columns: 40px 1fr auto;
    gap: 1rem;
    font-size: 1rem;
  }

  /* Footer */
  .footer-row {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  :root { --pad-x: 1.25rem; --section-y: 4rem; }
  .hero-title { font-size: 2.5rem; }
  .about-lead { font-size: 1.15rem; }
  .contact-email { font-size: 1.4rem; }
  .nav-links { font-size: 0.7rem; }
}