/* ================= TABLET (1024px) ================= */
@media (max-width: 1024px) {
  header {
    grid-template-columns: 1fr 0.8fr;
    gap: 48px;
  }
}

/* ================= TABLET (900px) ================= */
@media (max-width: 900px) {
  header {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: 80px;
    padding-bottom: 60px;
    min-height: auto;
  }

  .hero-card {
    max-width: 280px;
    margin: 0 auto;
  }

  nav {
    padding: 0 24px;
  }
}

/* ================= MOBILE (768px) ================= */
@media (max-width: 768px) {
  body {
    background: var(--bg);
    overflow-x: hidden;
  }

  .container {
    padding: 0 20px;
  }

  /* NAV */
  nav {
    padding: 0 20px;
  }

  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* HERO */
  header {
    display: flex;
    flex-direction: column;
    padding-top: 80px;
    padding-bottom: 48px;
    height: auto;
    min-height: auto;
    gap: 32px;
  }

  .hero-card {
    order: -1;
    margin: 0 auto;
    max-width: 220px;
    transform: none !important;
  }

  .hero {
    order: 1;
    text-align: center;
    width: 100%;
    transform: none !important;
  }

  .hero-greeting {
    justify-content: center;
  }

  .hero-tags,
  .actions,
  .socials {
    justify-content: center;
  }

  .hero p {
    margin-left: auto;
    margin-right: auto;
  }

  /* SECTIONS */
  .activity,
  .platforms,
  .expertise,
  .certs,
  .timeline,
  .achievements,
  .projects,
  .research,
  .contact {
    margin-top: 80px;
  }

  .stats-bar {
    margin-top: 60px;
    padding: 24px 20px;
    gap: 16px;
  }

  .stat-divider { display: none; }

  .stat-item { min-width: 80px; }

  .activity-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .activity-nav {
    display: none;
  }

  .activity-track-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 16px;
  }

  .activity-track {
    gap: 16px;
    transform: none !important;
  }

  .activity-card {
    flex: 0 0 82vw;
    max-width: 320px;
    transform: none !important;
  }

  .scroll-indicator {
    display: none;
  }

  .expertise-grid,
  .cert-grid,
  .platform-grid {
    grid-template-columns: 1fr;
  }

  .timeline-list {
    padding-left: 24px;
  }

  .timeline-dot {
    left: -30px;
  }

  .timeline-card-header {
    flex-direction: column;
    gap: 8px;
  }

  .activity-header h2,
  .expertise h2,
  .certs h2 {
    font-size: 26px;
  }

  .footer {
    margin-top: 100px;
    padding: 60px 20px 40px;
  }
}

/* ================= SMALL MOBILE (480px) ================= */
@media (max-width: 480px) {
  .hero h1 {
    font-size: 34px;
  }

  .hero .role {
    font-size: 16px;
  }

  .btn {
    padding: 11px 18px;
    font-size: 13px;
  }

  .actions {
    gap: 10px;
  }
}