/* ============================================
   PORTFOLIO RESPONSIVE — Breakpoints
   ============================================ */

/* ── Hamburger Toggle (hidden on desktop) ── */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: var(--z-nav);
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--c-text-strong);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

@media (max-width: 1100px) {
  .project-gallery {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 900px) {
  header { padding: 1rem var(--page-gutter); }

  /* Show hamburger */
  .menu-toggle { display: flex; }

  /* Nav fullscreen overlay */
  nav {
    position: fixed;
    inset: 0;
    background: var(--c-glass-full);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top: 5rem;
    gap: 2.5rem;
    z-index: var(--z-header);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
  }
  nav.open {
    opacity: 1;
    pointer-events: all;
  }
  nav a {
    font-size: 1.1rem;
    letter-spacing: 0.2em;
    color: var(--c-text);
  }
  nav a::after { display: none; }
  nav a:hover { color: var(--c-accent); }
  nav a.active { color: var(--c-text-strong); }

  /* Hamburger → X */
  body.nav-open .menu-toggle span:nth-child(1) {
    transform: rotate(45deg) translate(4.5px, 4.5px);
  }
  body.nav-open .menu-toggle span:nth-child(2) {
    opacity: 0;
  }
  body.nav-open .menu-toggle span:nth-child(3) {
    transform: rotate(-45deg) translate(4.5px, -4.5px);
  }

  .project-details {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 1.5rem;
  }
  .project-detail-item {
    text-align: left;
  }

  .project-header {
    flex-direction: column;
    gap: 1.5rem;
  }

  .project-gallery {
    grid-template-columns: repeat(3, 1fr);
  }

  .lightbox-prev { left: 0.5rem; }
  .lightbox-next { right: 0.5rem; }

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

@media (max-width: 480px) {
  :root {
    --page-gutter: 1rem;
  }

  .portfolio-hero {
    padding-top: calc(70px + 2rem);
    padding-bottom: 2rem;
  }

  .section-title {
    font-size: clamp(1.6rem, 8vw, 2.5rem);
  }

  .project-gallery {
    grid-template-columns: repeat(2, 1fr);
  }

  .project-details {
    flex-direction: column;
    gap: 1rem;
  }

  .project-title {
    font-size: clamp(1.5rem, 6vw, 2rem);
  }

  .project-description {
    font-size: 0.85rem;
  }

  .project-hero-image {
    aspect-ratio: 4/3;
  }
}