/* Mobile-first responsive enhancements */
@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  body {
    font-size: 0.95rem;
  }

  h1 { font-size: clamp(1.8rem, 8vw, 2.4rem); }
  h2 { font-size: 1.35rem; }

  .section {
    padding: var(--space-6) 0;
  }

  .hero {
    padding: var(--space-6) 0;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    text-align: center;
  }

  .hero-visual {
    order: -1;
  }

  .hero-content {
    max-width: 100%;
  }

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

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

  .hero-bio {
    font-size: var(--font-size-base);
  }

  .profile-image-lg {
    width: 180px;
    height: 180px;
  }

  .hero-stats {
    max-width: 360px;
    margin: 0 auto;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  /* Mobile navigation */
  .hamburger {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    transform: translateX(100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-smooth), opacity var(--transition-smooth), visibility var(--transition-smooth);
    z-index: 999;
    padding: var(--space-3);
    overflow-y: auto;
  }

  .main-nav.nav-open {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }

  .nav-menu a {
    padding: var(--space-3);
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
  }

  .nav-menu a.active {
    background-color: transparent;
    color: var(--color-primary);
    border-left: 3px solid var(--color-primary);
    padding-left: calc(var(--space-3) - 3px);
  }

  /* Stack grids */
  .profile-grid {
    grid-template-columns: 1fr;
  }

  .about-intro-block {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-photo {
    justify-content: center;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .contact-email {
    width: 100%;
    justify-content: center;
    word-break: break-all;
  }
}

/* Small mobile screens */
@media (max-width: 360px) {
  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.25rem; }

  .container {
    padding: 0 var(--space-2);
  }

  .card,
  .publication-card,
  .contact-card {
    padding: var(--space-3);
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }
}

/* Tablet adjustments */
@media (min-width: 769px) and (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 240px 1fr;
    gap: var(--space-4);
  }

  .profile-image-lg {
    width: 200px;
    height: 200px;
  }
}

/* Reduced motion preference */
@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;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}